' Feb. 22, 1938.

Re. 20,658

C. M. KNIGHT AUTOMATIC CONTROL SYSTEM FOR ELECTRIC MOTORS

Original Filed Feb. 11, 1925

.3a».

5 Sheets-Sheet l ’

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INVENTOR.

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(144/476 7/7. ?nfy?f BY

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,

Feb. 22, 1938. I

I c. M. KN‘IGHT

Re- 20,658 ‘

AUTOMATIC CONTROL SYSTEM FOR ELECTRIC MOTORS

Original Filed Feb. 11, 192E

‘S Sheets-Sheet 2 '

:1,

‘

-

INVENTOR.

- 6742a]: 27¢. #:2113272 ’

BY

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0?”. M~1TTORNEY$ , 5244 d

Fehfzz, 193s.‘

c. M. KNIGHT

Re. 20,658

AUTOMATIC CONTROL SYSTEM FOR ELECTRIC MOTORS. I

5 Sheets-Sheet 3

' Original Filed Feb. ‘11, '1925

Q

-

INVENTbK

Claude, I77. 791:9]: /

Feb. 22, 1938;

'

c. M. KNIGHT

O Re. 20,658

AUTOMATIC CONTROL SYSTEM FOR ELECTRIC MOTORS

Original Filed Feb. 11, 1925 f‘

5 Sheets-Sheet‘;

Q‘

INVENTOR.

(Ya ud'e ?71_ 52,7111; .

" @w M '* $052; 1

Feb."22, 1938.

Re. 20,658

C. M. KNIGHT

' . AUTOMATIC coxmzon SYSTEM FOR ELECTRIC MOTORS

Original Filed Feb. 11. 1925

5 Sheets-Sheet 5

. INVENTOR.

‘Claude .777. ll/nfyiz z‘Q .

BY

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ATTORNEYS

Re. 20,658 >

Reisaued Feb. 22,1938

UNITED STATES

PATENT oF-ncr.

20,858

AUTOMATIC coNmor. srs'mmron '

ELECTRIC Morons

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Claude M. Knight, Cleveland, Ohio Original No. 1,832,400, dated November 17, 1931, ,Serial No. 8,382, February 11, ‘1925. Applica tion for reissue July 25, 1933, Serial No. 882, 097

34 Claims. .(01. 112-2395

This invention, as indicated, relates to auto . matic controlling systems for electric motors.

More particularly, it has in view a control sys ‘tem especially adapted i'or use in connection with 5 the screw-down motor of a rolling mill. In the course of operation of adjusting the position of the rolls in a steel mill it is desirable to have perfect control of the screw-down mo tor of the type referred to, with absolute reliabil

10 ity of operation, and the system of control here in provided includes the means for automatical

ly starting, stopping and reversing an electric motor, as well as means for varying the points

for the ready adjustment of the‘range of action of the motor control mechanism. A further ob ject is to provide safety control elements to in sure certainty of action of'the screw-down mo tor. Another‘object of said invention is to co- 5

ordinate the screw-down motor controllerwith the other mechanism of the rolling mill, and in

accord with the position of the work operated upon. Other and further objects of the inven tion will appear in the course’"oi' the following '10 . description.

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While the description of this invention relates to the application of the same to a screw-down

at which such automatic action takes place and ' motor for a rolling‘ mill, it is obvious that certain , portions of the invention are of general applica- 15 - 15 includes auxiliary manually controlled 'means which may be substituted in part or in whole for various portions of the automatically controlled means at any time that the operator of the mech anism desires to substitute such control, such no change from one method of control to another

tion and it is therefore not intendedto in anyway

restrict the scope of the claims to the particular construction illustratedand described. To the accomplishment of the foregoing and related ends, said. invention, then, consists of the’ means 20 hereinafter fully described and particularly

being capable of being made at the will of the operator without the necessity of making numer ' pointed out in the claims. ous preliminary changes.

The control may be

completely automatic, including starting, stop 25 ping, and reversing of the motor; it may be a manual control with provision for automatic stopping of the motor only; it may be a com plete manual control; or it may comprise the manual starting of the apparatus and automatic 3O

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stopping of the same and automatic reversing _

of the mechanism.

In addition to the variety 01' control provided for, it has been found desirable to introduce ad ditional features of construction which, while not absolutely essential to the carrying out the con trols referred to, serve as safety devices to insure reliability of action.

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In rolling mill practice it is usual to have one

of each pair of rolls adjustable in order to. bring 40 the billet or piéce of work operated on to the

desired dimensions. The adjustment of the movable roll is usually provlded‘ior by means of . an electric motor and the control system for such motor is designated a screw-down controller. ' The principal object of my invention is to pro

' The annexed drawings and the following de scription set forth in detail certain mechanism '

embodying the invention, such disclosed means 25 constituting, however, but one of various mechan ical forms in which the principle of the invention may be used.

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In said annexed drawings: Figure 1 is a side elevation of a rolling mill '30 having a screw-down motor and motor control embodying the principle or my invention; 7

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Figure 2 is a diagrammatic view showing the electrical circuits and associated mechanism of

the controller system;' 35 Figure 3 is a ‘front elevation of the controller dial;

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Figure 4 is a rear elevation of the controller mechanism with portions broken away to illus- '

trate the circuit connections; Figure 5 is an enlarged diagrammatic view of the apparatus as seen along the line 5-5, shown in Figure 8, looking in the direction of the ar rows;

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Figures 6 and 7 are side elevations of segment 45 vide control means which will cause an electric switches carried by the controller dial; ' Figure 8 is a side elevation of a trigger switch motor to operate in certain predetermined stages adapted to be operated by contact with the work ineither direction oi travelr Another object of : passing through the rolls: ~ ' said invention is to provide for the starting, stop Figure 9 isan‘ end elevation of the trigger 5o 50 ping, or reversingot an electric motorat prede ‘ termined intervals. A further object of said in? switch shown in Figure 8; Figure 10 is a diagrammatic view showing an vention is to ‘provide for a_ variable degree of

, 4;,

manual control which may be used alternatively to the automatic v‘control ‘0t an electric motor.

:55 Another object of the invention is to provide

alternative formoii electrical connections and

associated mechanism for the trigger switch;

Figure 11 is 'a diagrammatic view showing a u

2 simpli?ed form of the controller system‘ whereby it is ~ adapted to operate an electric motor in stages;

and

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Figure 12 is a front elevation of a dial adapted for the controller system shown in Figure 11. The apparatus, as is disclosed in Figure 1, com prises a frame .J within which are mounted apair of rolls 0, P, such as are used in rolling mills for reducing ingots, billets 'or other work pieces 10 to the desired shape and dimensions. The rolling mill may be of any standard design and the de tails thereof form nopart of the present inven-'

ing material is mounted. l‘he shaft l0, hereto fore described, extends through the base and has, the drive gear 22 secured to one end of the same

and the indicator arm 8 secured to its opposite end. The dial is of circular shape and is pro vided at its marginal edge with an annular scale

which may be ‘adjusted about its periphery to bring the markings to any point desired. At tached to the dial are a plurality of segment rings

2, 4 and “8 concentrically arranged with respect 10 to each other, each ring being formed of closely juxtaposed segments‘of suitable current conduct

tion. The mill illustrated is areversible mill of . ing material such as copper, and each segment

the “two-high roll”, type of construction. The

16 upper roll 0 is vertically adjustable and the ends Y being insulated from every other segment in the same ring and the several segment rings being

thereof are journaled in-supporting blocks Q slid ably engaged in the end portions of the frame J.

15'

insulated from each other. A continuous ring 8 [of similar material to that of they segment rings

Each supporting block is screw-threadediy en-_ is provided concentrically within ‘the segment gaged upon a vertical adjusting screw T rotat

ably engaged in the respective side‘ portion of the frame.

Each of said adjusting screws has a worm

gear 54 mounted adjacent its upper end.

,rings and all of said rings are concentric with

the shaft lli. Arranged circumferentially of the segment ring 2 a series of. individual segment switches 3 is provided-by means of which each individual segment‘ may be alternatively‘ con

A screw-down motor G is supported on the -' upper side of said frame and the shaft 85 thereof. - nected to the conducting rings 30 or 3| arranged is provided with a worm (not shown) for driving ‘ immediately beneath the same.

each of said worm gears 64,.

The outer end of

m

25

At a. point between the segment rings 4 and 2,

said shaft 85 is provided with a beveled gear 68 _ a series of individual segment switches 5 is pro

which intermesh'es with a beveled gear ‘61 mount ed on the end of the shaft 24 which is supported

vided forv connecting the individual segments 4 which» alternatively may be connected to the conducting ring 32 or the contact I2. A similar 30 series of individual contact switches ‘I is inter posed between the segment ring 6 and the con tinuous contact ring 8. These individual switches

within the housing of the screw-down controller L. Said screw-down controller is mounted upon a support 20 at one side of the frame J adjacent the motor G and, as shown in Figure 4, is provided with a shaft l0 journaled in a bearing I is in said 35 support and driven by a gear wheel 22 actuated are adapted to connect ‘their respective segments to the conducting ringv 32 or to disconnect it by a worm~23 upon the shaft 24“ heretofore re therefrom as desired. In the description of the ferred to. The controller shaft thus is actuated aoperation'of this apparatus to follow, the term . by the screw-down motor which drives the vad— '

justing screws for the roll and the motion of said controller shaft corresponds in direction with that of said motor G. I

A series of feed rolls N is provided, extending on either side of the mill in alignment with the

upper edge of the stationary roll P, and adjacent 45 the side edges of the frame J, intermediate a pair

of said feed rolls, a pair of triggers 8|, 6|’, is piv otally supported.

a

“connecting segment" will be used to refer to the connection ‘of a segment in the ring 6 to the con

ductingring 33, or of a segment in the ring 4 40 to the conducting ring 22, and of a segment in the ' .

ring 2 to the conducting ring Ii, and the ex-. _

pression “disconnected segment" will be used to refer to any of such segments as have been dis

connected from their respective conducting rings 45 32, 33 and II by means of their individual switches Just

described.

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The mechanism associated with said triggers The individual switches 3 and 5 are illus is disclosed in Figures 8 and 9. As therein dis in enlarged detail in Figures 6 and‘ 7 of the so" closed each trigger is mounted at an intermediate trated drawings, and in Figure 5 is shown the connec 50 position upon'a shaft 62, which carries at its rear tion of said switches with their'respective seg ward end an upwardly projecting arm GIL-the _ 'ment plates. In said Figure 5 there also is shown path’ of. movement of which carries it'pastthe the brushes I I,- IS, I 4, and II, mounted upon the lower end of a switch lever 63 pivoted adjacent 55 its upper end upon a pivot pin Ill and carrying arm 9 in positionv to make contact respectively with the segments of the rings 2, 4 and 8 and with 55 a laterally extending arm upon which switch con the continuous ring 8. These brushes are formed tacts H, I, are mounted. Said contacts, in the of suitable current conducting material and the normal vertical position of said lever 63, are adapted to be spaced a short distance from a pair brushes ll, l3 and I4 are of such size that they I may make contact with but one segment of their of stationary contact terminals 58,‘ 59. The ac respective rings at a time when centered on the so tion of the mechanism just described will be in dicated in connection with the ‘description of the segment, and said segments are so spaced that' the respective brusheswill not clear one segment electric circuits of the control mechanism. Mounted upon a suitable support adjacent the before making» contact with the nest adjacent ‘ ' ' controller a switchboard Z is provided, as is segment in‘ the direction of motion. shown in Figure 1, said switchboard carrying a The means for driving the arm 9 has been above 65 knife switch K, a pair of push button switches described and in order to have said arm travel 4i, 42, a five blade switch M, and the electro about the dial with the proper degree of motion magnetic switches S, F and R. The specific ac it is desirable to have the gear ratio between the 70 tion of theseseveral switches will be made clear motor G and the shaft l0 such’that the arm will in connection with the description of the circui make less than one complete revolution while oi’ the control system. . / said motor is operating from its starting point to The controller shown more particularly in its limit of travel in either direction. As has been FlguresS. 4, and 5, comprisesa supporting frame stated, the scale 2| may be adjusted about the 2| upon which a dial 1 of suitable non-conduct controller dial, and such adjustment is necessary,

20,053

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when rolls of different dimensions-and other left in connection with the conducting ring 82,

and inthe ring 8 all segments are connected to . . Circuit connections are clearly shown in Figure , the conducting rings 38 by means of their in 2 of the drawings. For the automatic operation dividual switches ‘I, except the segments opposite of the device the trigger switches H, I, heretofore the points marked A and E, which switches are

variable factors are to be provided for.

'described, are actuated as the work passes

disconnected from the conducting ring 88 by

through, the rolls and the screw-down mecha nism is operated between the several passes to set the rolls at the predetermined spacing. The elec 10. tro-magnetic switch F and its associated circuits

means of their individual switches. The five blades of the switch M are thenswung

are used‘to control the successive screw-down

to the right hand contacts and the switch K and the push button switches ll, and 4,2 are left in 10 open position. The brushes ll, l8 and II on the

operations of the motor G. After the last pass of the work through the rolls the electro-magnetic

arm 9 are in contact with the segments of the

switch S is\‘b'rought into action, which, through its associated'circuits and the electric magnetic

The feed rolls are then caused to rotate in a direction to cause the billet or piece of work op 15 erated upon to approach the mill from the right ' hand side of the view shown in Figure 1 of the

switch R, serves to reverse the motor G and re

store’ the screw-down control system to its original position.

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The ?ve blades of the switch M are placed on 20 the right hand contacts, shown in Figure 2,

when the full automatic action of the apparatus is desired. When, however, it is desired to as

rings 2, 4 and 6, respectively, opposite the point A.

drawings, ‘and in the course of its progress over

said rolls and through the mill the billet will depress the trigger 6|’ toward the rolls. The 20 trigger 6|” has associated therewith a mecha nism identical with that shown in Figures 8 and -

sume manual control ofthe/screw-down mech

9 in connection with the trigger 6|, but the po

anism but still retain the automatic stopping of the motor, the five blades of the switch M are thrown to the left hand contacts, shown in Fig

sitions of said parts are reversed, inasmuch _as '

sa‘d trigger is on the opposite side of the rolls. When the work passes over the companion trig ger 6|, said trigger will be depressed away from

ure 2, and the knife switch K is thrown to the the rolls which will cause the projecting arm 88 left if .a forward motion of the motor G is de sired and to the right if a reverse travel of said thereof to contact withthe lever 63, which will 30 motor is to be provided for. The push button ' then resume its normal vertical‘ position. ,As switches 41 and ll are utilized to startthe motor soon as the billet has passed over the trigger 8| said trigger will be released so that it may be in forward and reverse direction respectively. When‘ complete manual control of the screw-_ returned through action of its weighted lower down motor is to be provided for the five bladed end to a vertical position and in' thus moving its arm 68 will strike the lever88. and will bring switch M is thrown to the left, as shown in Fig ure 2, and the knife switch K is opened and the the contactors H and I against the terminal elepush button switches II and 42 are locked in ments 58 and 59, thus closing the circuit of the closed position. The swinging of the knife switch electric magnetic switch F. The circuit will be completed through the feed line 81 to the termi _K to the left then operates the motor in a for ward direction, while the swinging of ‘said switch nal 10, across the contactor supported upon the

to the right serves to‘reverse the action of said motor. Any of thestandard devices for quickly stopping the motor by braking may be employed, the device forming‘ no part of this invention. Obviously, when the knife switch is thrown to an

intermediate position the motor is quickly brought to rest.

I

The detailed description of the several circuits and their associated parts will now be taken up 50 in connection with a description of the operation

2,5

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35

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electro-magnetic switch S to the terminal 14, ‘then through the coil of the electro-magnetic switch F, the conductor II I and the conductor I08 to the terminal 53, and across the switch blade. 45 of the switch M to the terminal 83, 45 thence through the conductor 82 to the terminal 8|, across the contactor of the switch S to the‘ contact 88, thence through the conductor 88 to the terminal 58, through the contactor I and con ductor 121, to the terminal 9| , across the con

50

of the apparatus when used successively as an tactor of the switch S to the terminal 11, thence automatic, semi-automatic and manually con-_ through the conductor I88 to the terminal 5|, across the switch blade N of the switch M to trolled device. Where complete automatic con the terminal 86, thence through the conductor trol of the apparatus is to be had and it is de H0 and the conductor I03 to the conductor ring sired to roll a piece of steel to a size that will require it being passed through the rolls 0 and P H4, thence through the line conductor 25 to the five times, with an adjustment of the roll ,0 current source. when the circuit above described is closed the through the screw-down mechanism between

60

each vof said passes, the index on the arm 9 is positioned at some selected starting point such

as opposite the letter ‘FA?’ shown, adjacent said indicator in Figure 3 of the drawings. The gear

coil of the electro-magnetic switch F is ener

g=zed and the contactor bars 92 and 88 are drawn- _ 60

upwardly so as to close the circuits through the

field coils and armature 86 of the motor G, caus

ing the same to rotate in a forward direction _ bring the indicator to a second point, for-‘example which will drive the arm of the controller in a the point B when the rolls are [in position for the clockwise direction and brings the brush i3 car-l. ' second pass, opposite another point, for example *ried thereon into contact with successive.seg-.

ratio between the parts must then be such as to

that marked 0 for the .third pass, opposite ments of the ring 4 which have been connected to another point, for example‘ the point marked D the conductor ring 32 through their respective ‘for thefourth pass, and opposite ‘another point, individual switches, as hereinbefore described. for example the point marked E forthe-last pass. _The motor therefore continues to operate in the The segments in the ring 4 at the points A', B, C, forward direction, notwithstanding that the con D, and E, are disconnected from the conducting tactors H and ‘I have been brought against the

ring 32 by meansof their "respective individual

terminals 58 and 59 for only a brief period, in- .

‘ asmuch as the energizing of the electro-magnetic' 75 ,75 switches 8. All other segments in the ring] are

14

amass

switch F has closed a maintaining circuit through

position opposite. the pointzlil and'thevjbrushf I3

the switch U actuated thereby. _ Inthis secondary

will be in contact with the-segment 4, which circuit the current ‘?ows through the 5ieed line‘ been disconnected from the conductor ring-32 by

s1 to the‘terminal ‘II, across/aycontactoroi' the > ,5

means of its individual switch 5. At this time switch S to the terminal ‘I4,"through the coil F, 'the brush IIwill be in contact with asegment , thencethrough the conductor III and the con got the ring 2, which is connected to the conductor

' ductor I" to the terminal SI, across the blade ' ring I I , as above described.

45 ‘of the switch M to ‘the terminal 83, thence through the conductor 82 to the terminal Bl,

>10 across the contactor oi’ the switch S to the ter minal l8, thence through the conductor 8! to the: terminal 48, across the switch blade 43 of the switch M, to the terminal 81, thence through the conductor II! to the switch U, through the con ,15 ductor“ and the conductor ring I2, through the individual switch 5 to the segment 4, and thence through the brush ll and the conductors I I and I! connecting the several contact brushes on the arm 9 'to the brush II, and through said brush, 20 to the continuous ring 8 and its, conducting ring ;

H4, and thence through the conductor‘ 25 to the

Acircuit through the

electro-magnetic switch S will then be closed, the current ?owing through the conductor 99 and the coil S, thence‘ through the conductor Hi0 to, 10 the terminal 55, across a blade 4B of the switch ,

M to the terminal 84, thence through the con ductors I01, I 08 and 28' to the conductor ring II, then through the individual ‘switch 3 'to the seg ment 2 and through the brush II and conductors 15 ,I'I, I8 and I! upon the arm 9 tothe brush I5,

thence through the rings! to, the conductor [ring / I I4, and then through the line conductor 25 tothe current

source.

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When the electro-magnetic switch ‘S. is'ener 20

gizedf the conductors carried thereby, pivoted at the terminals 'IVI, TI and BI, are drawn upwardly .' The electro-magnetic switch F continues to be’ into ‘contact with the‘terminals ‘II, ‘I8 and 80, and energized in this manner until the motor has the contacts with the terminals ‘I4, 9| and’ 88, 25 traveled in a forward direction a sumcient dis “ respectively, are broken. The switch Y, also tance to bring the arm I to a position opposite carried by the magnetic switch S, is closed at'the ‘ I :. the point marked B, whereupon the brush II will same time. , ' be brought into contact with the segment 4 0p L When’ the billet leaves the rolls 0' and J? on posite said point B, which has been disconnected its last pass the end thereof rides over thetrigger ~30 from the conductor ring 32. The circuit will 6| and frees ivthev same so that it may rise to the thus be broken at this point and the electro-1 vertical position during which action-it strikes magnetic switch F wiil be de-energized and the the lever 63 and brings the contactor H against ‘ contacts 92 and “supported thereby. ‘will be the terminal II, closing a circuit which allows the opened, causing the motor circuit to be opened current to ?ow through the line 81 to the ter 35 and the motor brought to a stop. minal ‘III, across the contactor to the contact ‘II, During the period of action of the motor G, thence through the conductor ‘I2 and the coil of current source. ,

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while the controller arm 9 was being moved from

the position A to' the position B, the lowering screws T oi.’ the steel mill. were actuated to lower v40 the roll 0 until the same wasbrought into the

“proper position before the second pass of the billet through the rolls. This second pass oi’ the work through the rolls will be from the opposite side of the mill to that from. which the billet start-i ed and the rolls are caused to rotate in’ a dif

ferent direction by means 01' any? standard mech'

- anism in common use for said purpose.’

,

the electro-magnetic switch ‘ R, thence‘ through

the conductors ‘ll, III and 82 to the terminal 8|, across the contactor to the terminal 80, thence to the contacts I! and H, through the conductor‘ I28‘ 40 to the‘terminal 18, across the‘contactor to_the terminal 11, through the conductor I09 to the terminal II, across the blade 44 of the switch Mv to theterminal ll, thence through the conductors . IIII and I" to the conductor‘ ring II4, thence

45.

through the line conductor 25 to- the current source.

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The action oi.’ the mechanism which occurs upo Through the energizing oi the coil R, the con - the second pass of the billet through the rolls is l‘tactors‘? and‘ 85 are caused to close the motor

merely a reversal of the action brought about

during the ?rstgpass therethrough. The billet will pass over the trigger 6| without causing any circuit closing action of the circuit closing mecha

circuit 88, ",causing the motor G’ to rotate in 50

a reverse direction to that heretofore described. At the same time the switches V and W, carried

by the electro-magnetic switch-R, are closed and ' nism, but as it passes over the trigger GI ' itwill _ the switch X carried thereby is opened. ' 55 cause-the circuit to be closed by the contactors‘H ‘ The continuous operation of the motor in the

and I being moved against the terminals 58 and

'59, and the circuit will beclosed through the coil . F and the various conductors and switches as

above outlined, and the motor G will again rotate '

in the forwarddirectioi'i. The operation of the motor will continue until the brush I3 is brought into contact with the segment 4 opposite the point C, when the motor will be stopped, and the

reverse direction is provided for by current ?ow ing through theline conductor 9.1 to the terminal ‘III, across the contactor to the terminal ‘II, thence through the conductor ‘I2 and the coil R, thence ‘through the conductors ‘I3, Ill and’ 82 to the ter 60 minal OI, across the contactor to the terminal 80 to the contact I8,;'and thence through the con

ductors ‘I9 and I02, through the switch V carried ‘ ' roll-.0 will ‘have been brought into the proper by the electro-magnetic switchvR, thence through position relative to the roll P for operating upon the conducor. 28 and the conductor ring 33, the billet as it is again passed from the right hand . through an individual switch ‘I and a segment 6 side of the apparatus in the same direction as , to the brush I4 and the conductor Iii to the brush it was ?rst passed therethrough but with a smaller II, and thence to the conductor ring I and the degree of space between the rolls than was pro conductor ring II4 to the line conductor 25 and

70 vided during said ?rst pass.

A similar operation

or the mechanism occurs'as the billet is again passed from the left‘ to the right and the arm 8 ' then moved to a point opposite the letter “D".

when the last pass of the billet through the rolls 75

hasbeenmadethearmlwillbebroughttoa

back to the current source.

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The electro-magnetic switch'S has been held

70

energized during this time by means 01' a circuit '

passing from the current source through the coil

8, thence'through the conductor I00 to the tar I5, acm a blade 48 oithe switch M to 75

‘ minal

20,658

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. the terminal a, through the conductors m. m i the ring 8 to the conductor ring Ill and through ‘line conductor 2! to the current source. and I", thence, when the electro-mag'netic switch theThe circuit is automatically opened when the It is energized, through the switch W to. the con

brush I8 comes in contact with the segment 4, opposite the point B and the motor is stopped by the de-energization of the coil F. After the bil let has passed through the rolls the button 42 is If the electro-magnetic switch It is not ener gized, the current will flow from the conductor again depressed and the above operation is re I08 through the'switch X and the conductor IIM,v peated until the desired number of passes thence through the switch Y to the conductor through the rolls has been made. 10 After the last pass has been made and the mils 28 and the conductor ring 88, thence through an individual switch segment to the brush I I, thence are to be brought, to their original position the across the arm 8 through the conductors I'I, I8. switch K is moved to the right hand contacts‘ and I8 to the brush I5, thence ‘to the conductor connecting the terminals 88 and III. The but-1 15 8 and the conductor ring Ill; and thence ton. switch ‘I is then depressed and the electro is ring through the line conductor 25 to the current magnetic switch R is‘ closed. The current then ?ows through, the line 81 to the terminal 18,‘ source. ' "

ductor I83, the conductor ringI I4, and thence through the line conductor 25 to the current source.

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.The motor'continues to operate in the reverse direction until the arm 8 moves to a place oppo 20

site the point marked A, at which point the brush ~ I4 comes into contact with the segment 8, which

is disconnected from the-line 88. “andthe circuit

across to the contact ‘I4, thence through the con ductor 15 to the terminal 58, across. the blade 41 of the switch M‘ to the terminal, 85, thence 20 through the conductor 18 and coil R to the con ductor ‘I3 to the terminal 88, across the switch K

' which energizes the electro-magnetic switch-R is - opened. The opening of the switch It also breaks 25 the, circuit of the electro-magnetic switch 8 by

to the point 48, thence through the conductor

employ va skilled operator at the rolls as the set ting of the dial will produce identical work upon

brush I4 is in contact with a segment 8 which has been disconnected from the conductor ring 33 and the circuit is thus opened. The mecha nism is now ready for a repetition of the cycle of

I02 to the switch V and through the conductor 28 r to the conductor ring 38, thence to an individual 25 opening the switch W. Thecontactcrs ‘Ill, 11, switch 1 and its associated segment 8, through and BI are then brought to, their original posi-“ the brush II and conductor I8 upon the arm 8 tions and the apparatus is in readiness to repeat to the brush I5 and the ring 8, and thence the entire cycle of operations thus described upon through the conductor ring I I4 and the line con 30 ductor 25 to_the current source. 30 the next \piece of work to be‘rolled. v This circuit remains‘closed until the arm 8 is ‘It will be noted that with a control of the character above described it is unnecessary to in- such position opposite the point‘ A that the _ the successive billets ‘during each of the succes

sive passes and will bring the completed work to a predetermined ?ynished size. The quality of . operations just described and the switch blade is thrown to the left before commencing operations the product will be substantially uniform, inas . ‘ ‘ much as eachpiece "rolled is given exactly the upon the‘ next billet.‘ In order to carry out the full manual control 40 same draft on the respective passes and the re of the apparatus the switch M is thrown to the - liability of the action of the mechanism is in sured through the electrical control mechanism left, as shown in, Figure 2 of the vdrawings, the switch K is opened and the button switches - just described. In order to substitute a partial manual control .II and l! are locked in closed position, then as the of the apparatus for the full automatic control switch K is turned to the left the motor will be as ea and at the same time retainthe automatic stopping actuated in a rorward direction, the current ?ow features above described, the five bladed switch ing through the line conductor '81 to the terminal M is moved to the left hand contacts, as shown in ‘III, through the contactor to the terminal 14, Figure 2, and the knife switch K is thrown to through the coil ,of the electro-magnetic‘ ‘switch the left connecting the terminals 31 and 38. F and conductor III to the terminal 88, across 50. After the piece has passed through the rolls on the blade of the switch K to the terminal 81, the first pass the push button I! is depressed by through the conductor II! and the push button the operator and the electro-magnetic switch F switch 42 which is in closed position to the termi is energized. The current ?ows through the line nal 58, through the switch blade 44 to the ter 91 to the point 18, across the conductor to the minal 86, through the conductors III! and‘ I88 to terminal ‘I4, through the coil ‘F and thence the conductor ring IN, and thence through the

40 “ 45

50

through the conductor III to the terminal-38, ' line conductor 25 to the current source. To operate the motor in the reverse direction across the knife switch to the terminal 31, thence -

through the conductor Iii to the push button

the switch K is moved to the right to close the

conductors III and I08 to the conductor ring H4, and thence through the line conductor 25 to the

the line\conductor 81,,to the terminal ‘I8, across the '

circuit across the contacts 88 and 40, and the cur 60 60 switch 42 to the terminal 58, across the knife ' rent then ?ows from the current source through switch to the terminal 88, th'ence'through the

currentsource.

05

‘

As soon as‘the motoriG has started because of

this energization of the switch F, the button switch 42 is released.

The circuit is then com

pleted through the conductor II! to the terminal 48, across the blade 48 of the switch M to the terminal 81, through the conductor II8 to the switch U, thence through the conductor 21 and the conductor ring 82 to an individual switch 8

and the associated segment 4, thence through ‘the 75

brush I3 and across the conductorslil and I8 upon the arm 8 to the brush II, thence through

contactor of. the switch s to the terminal 14,,

through the conductor "Ito the terminal 88, across the blade‘x? of the switch M to the ter minal 85, through the conductor 16 to the elec

tro-magnetic switch R, through the conductor 18 to the terminal 88, through the blade of the switch K to the terminal 80, thence through the push button switch H which is in closed position to 70 the conductor I88, and thence through the con ductor ring III to the line conductor 25 to the current source.

>

e

.

The circuits controlled by the switches U, V, x and Yare not essential to the operation of the 75

6

20,658

device to e?ect the general control of the systems outlined, but said' auxiliary‘ circuits constitute safety means to insure the action of the motor at all times.

_

-

moves over a segment connected with. the con ductor 22. Thus the secondary circuit will have served to insure against the premature breaking

of the main circuit before the connection with The circuits controlled by the switches U and V ' the segments 4 connected with conductor ring prevent the accidental ‘restarting oi’ the motor I2 was regularly established. the _ after it has been automatically stopped through In addition to the special operating features the control arm being carried past a disconnected which may be added to the system originally de segment and on to the connected segment. When 10 such switches are employed absolute'certainty of scribed, I have found it desirable ‘for certain pur poses to simplify the control system so as to dis 10 operation is brought about even though a discon nected segment of the ring has been passed, as pense with the electro-magnetic switch S, with the original circuit will vhave been operated and the segment ring 2 andits series of individual the secondary circuit will be operated during‘ the switches 3, and with the five bladed switch M 15 momentary passing of the disconnected segment. and theiressociated electrical conductors, in cluding the brush H and conductor l'l upon the 16. The motor may be restarted ‘through the action arm 9 when the apparatus is to be used simply of the trigger switches SI and Bi’ or through the as a control for operating anelectric motor button switches ti and t2. ‘ v The circuits controlled by the switches X and in stages either in the forward or reverse direc tion of travel, or both, including means whereby ‘ Y in a similar manner provide against danger of 1. such stages may be readily altered to meet the 20 overlapping a segment connectedwith conductor . particular requirements under whichsaid motor ii. In‘ such event, the circuit would be com is used. By the expression referring to the oper

pleted through the line conductor 89, the coil S. the conductor M8, the contact 55, across the

switch blade 4i of the switch M to ‘the terminal ‘ 84, through the conductor I01, switch X, conduc tor I04, switch Y, conductor 29, conductor ring 30 and then through the segment switch 3 to the segment 2, to the brush ii, across the arm 8

30 through the conductors i1, i8 and i8 to the brush

' II, thence to the ring 8, the conductor ring H4,

ation “in stages" is meant the successive oper ation of themotor for predetermined periods of time of any desired length in one direction after 25 intervals of time, at the will of the operator. Such travel may be followed by a reversal of the action of the motor until it returns to its start ing point, or such return may hemade similarly in stages.

.

.

‘

30

The special apparatus i'dr ‘operating, a motor in

and through the line conductor 25 to the current v the manner just described is shown in Figures 11

source.

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’

Where the control is to be applied to. a motor

having acomparatively long operating range in either direction of travel, the arm 8 will necesL sarily move very slowly and under such conditions thetrigger switches Si or ii’ may becpened be ‘fore the brushes i3 or H have cleared the dis 40 connected segment suillciently to have engaged

and 12 of the drawings, and the parts therein, insofar as they are identical with those disclosed ~ '

in Figure 2, bear the same reference characters. If an electric‘ motor is required to operate in

five stages in the forward ‘direction and then op erate continuously in the reverse direction until

.the original starting point is reached, then the segments in the ring 4: opposite the points A, B, C, 40

the next segment. The circuit would then be opened prematurely and the system would fail _ D and E are disconnected from the conductor ‘ring 32 by means of their individual switches 5. In to function. The modified circuit shown in Fig the segmental ring 6 the segment 6, opposite the ure 10 will obviate this difficulty. All the remain-. point A, is disconnected from the conductor ring 45 ing circuits of the control apparatus are identical 33 bymeans of its individual switch ‘I. All other with those disclosed in Figure 2 of the. drawings segments of the ring 4 are connected to the con and Figure 10 merely illustrates supplementary ductor ring 32 and all other segments in the ring

circuits for bringing about certainty of action‘ of the ‘mechanism under vthe special circumstances

described. In place oi’ the contactors H and I

being operated directly by the trigger switches BI‘ and BI’ they are actuated by an electro-magnetic switch i2l. As shown in Figure 10v of the draw - ings, when the trigger switch ‘I ,actuates the lever

'55

"in the proper direction and ‘closes the switch I24 in the manner illustrated in Figures 8 and 9,

the circuit will be completed through the line conductor and the coil III, thence through the

conductor I23, switch I24, conducton I28, con ductor ring "4,‘ and thence to the current source I20. The contactors H and I will then close and the motor is sta'rtedin the manner heretofore ex - plained.

->

6 are connected to. the conductor ring 33. With the arm '9 pointing toward the portion of the device marked A, the knife switch K is turned 50. to the left so as to connect the terminals 31

and 28. When it is desired to start the motor’ the button switch 42 is depressed and the circuit will be completed through the line conductor 91, conductor iii, coil F,,conductor III to the termi 55 nal 38, across the switch K to the t‘erminal?l, through. the button switch 42 and conductors ill! and iii! to the current source 25.

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The motor G is'now caused to rotate in the forward direction by the action of the contactors 60 92, 93, supported upon the 'electro-magnetic switch F. This-movement of the motor carries the arm

As soon as the switch I24 swings open, 8 toward the point B and the brush clears the the circuit through the coil “I will remain closed ' disconnected segment of A. ‘The switch 42 may as long as the brush ll is in contact with the seg- ’ now be released as the‘ secondary circuit will then ment disconnected from the conductor 32 and be established through the switch U supported ' connected to the conductor‘ I II. This maintain upon the electro-magnetic switch F, such cir ing circuit will include the‘ current source, the, cult being through the line conductor 91, conduc- " conductor I23, the switch I22, the conductor l2l tor H4, coil F, conductor Hi to the terminal 38, 70 and conductor ring ill, individual switch I, seg across the switch K to the terminal‘ 31, through ’ ment 4, the brush II, the arm l,.conductors is the conductor I29, switch U, and conductor l3l 70 and is ,on the arm 8', the brush II, the ring I, to to the conductor ring 32, thence through the seg

the conductor ring “4, and the conductor to the

‘current source at I20. ~. This as 7

is

l

soonasthebrhshll

ment switch I to‘ the segment 4, and through .

the brush. l3 across the conductors l8, IS, on

the arm I to the brush Ii, and then-through the. 7f

90,658 a reversible intermittently operable electric ‘mo-r

ring l-tothe conductor ring Ill and to the cur rent source at 29.

_

tor, a source of power therefor and means as

'

This circuit remains closed until the brush it ‘ sociatedwwlth said apparatusfor closing the‘mo

reaches the disconnected segment I opposite ‘the ‘ tor circuit to inaugurate operation, of means for determining the direction and extent of such op point B, at which point the circuit will be auto matically opened, the coil F de-energized and eration as inaugurated by successive operations of said first-mentioned rneans, comprising acon- '

- the motor stopped. . In exactly similar manner the

troller positively driven by said motor and'pro

motor 'is caused to stop when the arm 9 moves

‘~ on the dial opposite thepoints C, D and E, re- . vided with. adjustable - devices for temporarily maintaining the motor circuit closed and opening » 10 spectively.

10V

when the arm 9 reaches the point E, estab- ‘it at selected points of controller travel, and ad lished as the limit of forward travel of the motor, justable means for selecting forward or reverse and it is desired to cause the motor to rotate in motor connections for subsequent closure by said

thereverse direction until the original starting

?rst-mentioned means.

'

.

15 vin combination, a material modifying apparatus, '

3. A device of the character described-havin

15 point is reached, the switch K is thrown to the

right, connecting the terminals 99 and 49. The button switch ll is then depressed and the a reversible intermittently, operable electric mo circuit will be established from the source through ‘ tor, a source of power therefor and means for the line conductor 91, conductor I'll, coil R, con ,clos‘ingthe motor circuit to inaugurate opera- \ 20 ductor 19 to the terminal 99,‘ across the blade \ tion, of means for determining the direction" and 20 of the switch K to the terminal 49, thence through extent, of such operation as inaugurated by suc the button switch 4| , conductor I93 to the current cessive operations of said ?rst-mentioned means, -_comprising a controller positively driven by said' source at 29. ‘ The motor will be caused to rotate and will ' motor and provided with adjustable devices for carry the arm 9 in a counterclockwise. direction. ‘temporarily maintaining the motor circuit closed 25.

and opening it at selected points' of controller

Upon the energization of the coil R the secondary vcircuit will be established through'the line con

travel, and' adjustable means for selecting for

ward or reverse motor connections for subsequent to the terminal 99, across the blade of the switch closure by- said ?rst-mentioned means and al 30 30 K to the terminal 40, thence through the con , ternative. means ‘for manually controlling the ductor I32, switch V, conductor I99, thence to starting, stopping or reversing of said motor. 4. The combination withan intermittently op the conductor ring 99 and the segment‘ring 9,

ductor ill, conductor H5, coil R, conductor 19

erable electric motor, a source of power therefor

- thence to the brush ll, across the conductor I 9

and manual means for closing the motor circuit to inaugurate operation, of means for determin ing the extent of such operation as inaugurated until the brush it comes into contact with the - by successive operations of said manual means disconnected segment in the ring 9 opposite the comprising a controllerpositively driven'by said point A. The circuit will be then opened'and motor and provided with adjustable devlcesfor

on the arm 9 to the brush l5, thence through 35 the ring 9 to the conductor ring Ill to the cur rent source at 29. This circuit will remain closed

temporarily maintaining the motor circuit closed 40

v40 the coil de-energized and the motor G stopped.

and opening it at selected points of controller travel, and adjustable means for selecting motor connections for subsequent closure by said man

The apparatus is now in position for the repeti tion of the entire cycle of operations just de

'

scribed.

Should it be desired to assume manual con 45 trol of the control-apparatus disclosed in Fig

'ual means.

ures 11 and 12, the button switches II and 42 are locked in closed position and the motor is

controlled by manipulation ‘of the switch K. The ,contacts 92, 54, and 51, of the switch'M 50

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L

5. A device of the character described having ' in combination, a material modifying apparatus, an intermittently operable electric motor, a source of power therefor and means for closing

the motor circuit to inaugurate operation, of

establish connections which prevent undesirable means for determining the extent of such opera

, counter currents being set‘ up.

tion as inaugurated by successive operations of

»

said ?rst-mentioned means comprising a con

Other modes of applying the principle of my invention may be employed instead‘ of the one.

troller positively driven by said motor and pro vided with adjustable devices for temporarily 55 mechanism herein disclosed, provided ‘the means maintaining the motor circuit closed and open stated by any of the following claims or the ing‘ it at selected points of controller travel, and adjustable means for selecting motor connec equivalent of such stated means be employed. I therefore particularly point out and distinct tions for subsequent closure by said first-men;

explained, change being made as regards the

ly claim as my invention:

tioned means.

‘ 1. The combination with a reversible inter

mittently operable electric, motor, a source 'of power therefor and manual means for clo?ng

the motor circuit to inaugurate operation, ofv

'

asource of power therefor and means includ

means for determining the direction and extent

ing work-actuated switches, electro-magnetic 65

65 of such operation as inaugurated by successive

operations of said manual means, comprising a controller positively driven by said motor and provided with adjustable devices for temporarily maintaining the motor'circuitclosed and opening. 70 it at selected points of controller travel, and ad justable means for selecting forward or reverse

motor connections for subsequent closure by said manual means.

'

6. A} device of the character described having 60 in combination, a material modifying apparatus adapted to progressively handle the work, a re versible intermittently operable electric motor,

,

2. A device of the character described having 75 in combination, a material modifying apparatus,

switches and an auxiliary circuit for actuatingv same and -a second auxiliary circuit for main

taining ?rst-named auxiliary circuit closed, for. closing the motor circuit to inaugurate opera tion, of means fordetermining the direction and extent of such operation as inaugurated by suc cessive operation of said closing means, compris ing a controller positively driven by-said motor

and provided with adjustable ‘devices for tem porarily maintaining the motor circuit closed

8

some

and opening it at selected points of controller»

by said motor, and provided with adjustable-de vices tor temporarily maintaining the motor c1r-'

travel',i_:and ‘adjustable means. for selecting for, ‘ ' ward orrrevers'e motor connections for-subsequent closureibwsaid closing means.

1

_

I -

cult closed and opening it at selected points of

controller travel, and adjustable'means for select

-

7. A, device 01' the character described- having in ‘combination, a material modifying apparatus adapted to progressively handle the-work, a're-'

ing forward ‘or reverse motor connections, for subsequent closure by said closing means and alternative means ior manually controlling the starting, stopping or reversing of said motor. 10. In a control system for rolling mills pro vided‘ with a plurality of rolls, in combination, a screw-down motor for adjusting the rolls, a limit switch, means for e?ectingthe operation of said

versible’intermittentl’y operable electric motor, a .source of power» therefor and means includ -,

l0 ing work-actuated switches,‘ el'ectro-magnetic ‘ switches energized by closing of said work-actu

ated switches,‘ an. auxiliary circuit-for actuating said electro-‘magnetic switches, and a second limit switch in accordance'with the operation’oi . auxiliary circuit for maintaining ?rst-named auxe 15 iliary circuit closed for closing the motor ‘circuit the screw-down motor, means cooperative with ‘the limit switch to effect the’ stopping of the 15 to inaugurate operation, of automatic means for screw-down motor in ‘a plurality oi’ ~predeter-- ' determining the direction and extent of such op mined positions, and means vi'or variably control eration as inaugurated by successive operations ling the distances'between the respective posi of ‘said closing means, comprising a third electro 20 magnetic switch and an auxiliary circuit for, ac 11. In a control system for rolling mills pro 20. tions.

tuating sarne and another ‘auxiliary circuit for maintaining said last-named auxiliary circuit

and opening it at selected points of controller

the distance between the respective roll positions

ward or reverse motor connections,‘ for subse

to diil‘erent values.

‘

8. A device of the character described having adapted to progressively handle the work, a re versible intermittently operable electric motor, a '

_ including workeactuated switches, electro-rnag

actuated switches, an auxiliary circuit for actuat ing said electro-magnetic switches, and a second auxiliary circuit for maintaining ?rst-named aux iliary circuit closed, for closing-the motor circuit

tion at a pluralityoi di?erent predetermined I . positions.

determining the direction and extent of such

ally operable switch i'ore?ecting the starting of

operation as inaugurated by successive operations

the screw-down motor, a limit switch operable in accordance with the movement of the screw-down motor, and means for variably presetting the automaticstopping- means to function at a plural ity of ‘different predetermined positions.

of said closing means, comprisinga third electro 45 magnetic switch, and an auxiliary circuit for Y actuating same and another auxiliary circuit for

maintaining said last-named auxiliary circuit closed and a. controller positively driven by said motor and provided with adjustable devices for

I

temporarily maintaining the motor circuit closed

a screw-down motor for positioning the rolls, a

manually operable switch for e?ectlng the start ing of the screw-down motor, means i'or auto maticallystopping the screw-down motor when therolls are in preselected positions, and means‘ for adjusting the-preselecting means for' said 55

ward or reverse motor connections, for subse

quent closure by said closing means, and alter-'

native means for manually controlling the start - ing, stopping or reversing of said motor.

adapted to progressively handle the work,~a re source of power therefor and means including a

work-actuated switch, anelectro-magnetic switch and contactors and an auxiliary circuit torfactu sting same, electro-mag'netic switches and a sec 85 ‘ond auxiliary circuit for actuating same, a third

auxiliary circuit for maintaining last-named aux- ‘

iliary circuit closed, tor closing the motor circuit to " inaugurate operation of automatic means for ‘

determining the direction and extent of such op eration as inaugurated bysuccessive operations of said ‘closing means, comprising a fourth elec tro-magnetic switch and an auxiliary circuit for actuating the same, and another auxiliary clr-'v

14‘.v In a control system for rolling mills pro

vided with a plurality of rolls, in combination,

and opening it at selected points ot'controller travel, ‘and adjustable means for selecting for

.versible intermittently operable electric motor, a

'

13; In a control system for ro-lling.mills pro vided with a plurality of rolls, in combination, a 40 screw-down motor for shifting the rolls, a manu

to inaugurate operation, of automatic means for

in combination‘, a material modifying apparatus

'

the screw-down motor when the rolls have reached a predetermined position, and means for 35 presetting the automatic stopping means to func

, , netic switches energized by closing of said work--'

9. A device of the character described having

'

down motor, means for automatically stopping

source of .power therefor and automatic means

40

f

12. In a control system for rolling mills pro vided with a plurality of rolls, in combination, a 30 screw-down motor for shifting the rolls, manual means for effecting the starting of the screw

in combination, a material modifying apparatus '

'

determined positions, and means for regulating ‘

travel,v ‘and adjustable means for selecting for 30

'

screw-down motor for shitting the rolls, manual means for starting the screw-down motor, means for automatically stopping the screw-down mo tor and rolls when the rolls are. in di?’erent pre 25

motorv and providedv with adjustable devices for temporarily maintaining the motor circuit closed

quent’ closure by said closing means.

_

vided with a plurality of rolls, in combination, a '

closed and a, controller positively driven by said 25

,

positions.

~

,

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15. In a control system for variably operated apparatus, the combination of a motor for driv ing elements of the apparatus, a limit‘ switch, means for eii'ecting' the operation of said limit switch in accordance with the operation of the motor, means cooperative with the limit switch to cited: the stopping or the motor in a plurality of predetermined positions, and means for var

iably controlling the distances between the re spective positions.

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16. In a control system for rolling‘ mills pro'-_

vided with a plurality of rolls, in combination, a screw-:down motor for adjusting the rolls, a limit switch for electing the operation 01' the screw 70

down'motor, means tor-starting the screw-down motor, and presetting means responsive to the - limit switch for successively automatically stop

cult for maintaining said last-named auxiliary ping thescrew-down motor when the rolls are in circuit closed,:and a controller positively driven dlirerent predetermined podtions.

'

“s.

75

20,858 17.,In a control system for rolling mills pro vided with a plurality of rolls, in combination, a screw-down motor for adjusting the rolls, a limit switch for e?ecting the operation of the screw down motor, means {or starting the screw-down motor, means responsive to the limit switch for

automatically stopping‘ the screw-down motor ‘when the rolls are in different predetermined p0— sitions, and means for variably pre-setting the 10 automatic stopping means to function at, a plu

rality or different predetermined positions.

18. In a control system for rolling mills pro vided with a plurality of rolls, in combination, a

screw-down motor for shifting the rolls, manual 15 means for-effecting‘ the starting of the screw

down motor, manual means for reversing the screw-down motor and presetting means for suc

cessively automatically stopping the screw-down motor when the rolls are in diiferent predeter mined positions.

'

19.1n a control system for rolling mills pro vided with a plurality of rolls, in combination, a

screw-down motor for shifting the rolls, manual means for effecting the starting of the screw down motor, manual means for reversing the screw-down motor, means for automatically stop ping the screw-down motor when the rolls have reached a predetermined position, and means for pre-setting the automatic stopping means to 30 function at a plurality oi’ di?erent predetermined positions.

>

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20. In a control system for rolling mills pro vided with a plurality of rolls, in combination, a screw-down motor for shifting the rollsI means 35 for starting the screw-down motor, presetting

means for successivelyautomatlcally stopping the screw-down motor and rolls when the rolls are in

di?erent predetermined positions, and means for

automatically reversing the screw-down motor 40 and rolls at predetermined positions.

. 21. In a ‘control system for rolling mills pro

vided with a plurality 01 rolls, in ‘combination, a screw-down motor for shifting the rolls, means - for starting the screw-down motor, means for

'45

automatically’ stopping the screw-down motor and rolls when the rolls are in di?erent predeter mined positions, means for automatically re versing the screw-down motor and rolls at prede

screw-down motor for shifting the‘ rolls, means, '

for start-ins the screw-downmotor, preaet?ng

means for successively automatically stopping the

screw-down motor and rolls when the rolls are in

different predetermined positions, 'means for automatically reversing the screw-down motor and rolls at predetermined positions, and means for rendering the automatic means ineiiective and making the screw-down motor responsive to manual control.

,

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v25. In a control system for rolling mills pro‘ Vided with a plurality of rolls, in combination. a screw-downmotor for shifting the rolls, means for starting the screw-down motor, means for automatically stopping the screw-down: motor‘, 15 and rolls when the rolls are in different predeter mined positions, means for automatically revers— ing the screw-down motor and rolls at predeter mined positions, means i'or presetting the auto matic stopping means tovtunction at a plurality 2,0 of di?erent predetermined positions, means for

presetting the automatic reversing means to func tion at diii’erent positions ‘and means for render~ ing the automatic means ineiiectlve and making the screw-down motor responsive to manual con ~25 trol.

'

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26. In a control system for variably operated apparatus, the combination of a motor for driv ing elements oi’ the apparatus, means for start ing the motor, means for automatically stopping the motor and associated elements when the ele-. ments are -in di?erent predetermined positions, means for regulating the distance between the

respective positions to di?erent values, and means for rendering the automatic means ineffective 35 and for making the motor responsive to manual control. 27. In a control system for rolling mills provided with a plurality of rolls, in combination, a screw down motor for adiusting the rolls, a limit switch, 40 means for e?ecting the operation of said limit switch in accordance. with the operation of the screw-down motor, and presettlng means cooper ative with the limit switch to effect the stopping of the screw-down motor successively in a ‘(plu 45

rality of predetermined positions. 28. In a control system for rolling mills pro- ‘

termined positions, means forpresetting the auto

vided with a plurality of rolls, in combination, a screw-down motor vfor adjusting the rolls, a limit

matic stopping means to function at a plurality of diil’erent predetermined positions, and means for presetting the automatic reversing means to

down motor, means for starting the screw-down motor, and presetting means responsive to the

function at different positions.

'

. 22. In a control system for rolling mills pro

vided with a plurality oi! rolls, in combination, a

switch for effecting the operation of the screw-' limit switch for-successively automatically stop-. -

ping the screw-down motor when the rolls are in one of a plurality of different predetermined posi 55

’ screw-down motor for shifting the rolls, means, tions. 29. In a control system for rolling mills pro for starting the screw-down motor, presetting means for successively automatically stopping the vided with a plurality 01’ mils, in combination, a screw-down motor and rolls when theirolls are in screw-down motor for shifting the rolls, manual di?erent predetermined positions, and means for vmeans for starting the screw-down motor and manually reversing the screw-down motor and presetting means for successively automatically stopping the screw-down motor and rolls when rolls. .

23. In a control system (or rolling mills pro vided with a plurality of rolls, in combination, a screw-down motor for shifting the rolls, means for starting the screw-down motor, means for

is

30. In a control system for rolling mills pro vided with a plurality of rolls, in combination, a

and rolls when the rolls are indi?'ercnt predeter

screw-down‘motor for shitting the rolls, means for eii’ecting the starting oi’ the screw-down motor, and presetting means for successively

mined positions, means for manually reversing

automatically stopping the screw-down motor 7

automatically stopping the screw-down motor

w

the rolls'are in di?erent predetermined positions. '

the screw-down motor and rolls, and means for‘ when the rolls have reached one o! ' a plurality of 70 predetermined positions. ‘ presetting the automatic stopping means to func 31. In a control system for rolling mills pro tion 'at a. plurality of di?erent predetermined vided with a plurality of rolls, in combination, a positions. . screw-down motor i'or'shitting the rolls, a manu 24. In a control system for rolling mills pro vided with a plurality of rolls, in combinationI a, NIY operable switch for effecting the starting'oi g" _

10,

90,658

the screw-down motor, a limit switch operable in accordance with the movement of the screw

from one position to another as metal is passed

through the mill, means for starting the screw

down-motor, means for substantially simulta'ne- I down motor, presetting means for successively

ously presetting said switch to ei'iect the succes sive stopping oi’ the screw-down motor when the rolls are in dii'ierent predetermined positions. 32. In a control system for rolling mills pro ' vided with ‘a plurality of rolls, in combination, a

screw-down motor for positioning the rolls, a 10 manually'operable switch for effecting the start

in: of the screw-down motor, means for auto

matically stopping the screw-down motor when the rolls are in preselected positions, and means for setting the preselecting' means. 16

‘

83. In a control system i'or rolling mills pro vided with a plurality of rolls, in combination, a screw-down motor for moving one oi'the rolls _ I

controlling the motor to set said roll in a plurality of predetermined selected positions,ssaid control

means being adapted to automatically stop the screw-down motor when the rolls have been actu ated to the selected-relative positions. 34. In a control system for rollingmills pro vided with a plurality of rolls, in combination, a 10

screw-down motor for moving the rolls, preset ting means for providing successive automatic selection of one of a plurality 01’ roll' positions, and means for rendering the automatic means ineii'ective and making the screw-down, motor responsive to manual control.

. .

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- CLAUDE M. KNIGH‘I‘. ‘