US1347305A - Motor control - Google Patents

Description

w. G. TAYLOR. MOTOR CONTROL.

APPLICATION FILED MAY 29. 1917.

1,347,305. Patented y 20, .1 2 FTQ-L 20 a r r 1 Z a Z Inventor William GfTaslor-g H i s fitter-neg.

UNITED STATES PATENT oF-FicE.

WILLIAM G. TAYLOR, or SCHENEGTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A coarom'rron or NEW YORK.

MOTOR CONTROL.

Specification of Letters Patent. P t t J l 2 2 Application filed May 29, 1917. -'Serial No. 171,774.

To all whomz't may concern:

Be it known that I, WILLIAM G. TAYLOR, a citizen of the United States, residing at Schenectady, in the county of Schenectady,

I State of; New York, have invented certain new. and useful Improvements in Motor- Control, of, which the, following is a specification.

My invention relates to'the drive of embossing machines and the like and it provides improved means whereby the drive the hide must be manually shifted to another position so as to emboss another portion. The drive for such machines has heretofore been such that the output of the machine has been, very limited because the operator' has had so many thin s to lookafter and to operate manually. ne of'the lobjects ofmy invention is the provision of an arrangement whereby afterthe hide is once placed iILHPOSltiO'IItO be operated upon by the embossing apparatus ,-the successive operations of embossing, shifting e hide, etc., are all automatically performed without the necessity of any attention to the-machinery itself from the operator, the arrangement, however, being such that the operator has 'at'all times completemanual control of the operation of the machine at starting or in case for any reason it should become necessary to assume manual control during the automatic operation. i

It is necessary that thehide be shifted an exact distance after each embossing operation "in order that there'shall be neither blank .nor overlapped spaces between the successive embossed sections and my invention has for one of its objects the provision of an arrangement whereby this exact cooperation between the embossing-mechanism and the means for shifting the hide is obtained. v

ln carrying my invention mto efi'ect I preferably provide an electric motor to opv erate the embossing mechanism, which is ordinarily a roller adapted to reciprocate back and forth across an embossing plate or ally an endless carrier on which the hidesare placed. I provide an improved control 1 a I arrangement for these motors, each driving 3 a separate load and performing a separate function, so that the operationsof the mo- .tors are coordinated and each willperform its required function in the proper sequence for the proper operation of the machine. The I functions of these motors are coordinated so that, after the embossing roller has completed' its movement in one direction, it is stopped andthe motor driving-the endless belt carrier on which the hide is placed, is energlzed, so, asto' shift the hidethe exact distanoe corresponding to the width of the embossing plate, after which, the motor driving the embossing roller is energized to reverse lts direction of-operation andmove the rollerback'acl ioss the hide, this sequence of operations continuing until the sourceof supply to the motors is out 011' or the operator assumes manual control of the machine.

After the machine is properly started the attentionof the operator; is ordinarily not required other than to put new hides on the endless carrier and observe theoperation on the hides. My invention further provides an arrangement whereby the -operation of the driving motors may be arrested at any POlIllZOI' themachine be started, stopped or reversed at the will of the operator without destroying this coiiperative relation of the motors, by means of push buttons or the like conveniently located at the ope rators position by the machine.

By. means of my invention, the output of I the machine is greatly increased because 'the interval between 'the successive operations I is reduced to' the practical minimum and because of the factthat the, time. of the operator is practically. entirely devoted to placing new hides on the carrier and observing the embossing operation without the necessity, ordinar 1ly,of any of his time being taken tocontrol the operation of the machine, since after, the machine is started properl all the various functions are automatical y controlled. I v 1 For a-better understanding of my invenscription taken in connection with the accompanying drawing wherein I have disclosed one embodiment ofmy invention.

Referring to the drawings, Figure 1 shows in simplified diagram, my improved control system in which the operations of a plurality of driving motors are automatically coordinated or manually controlled at the will of the operator. Fig. 2 is a simplified diagram of an embossing machine showing electric driving motors for operating the embossing roller and for shifting the endless carrier on which the hides to be embossed are placed. 1

Referring first to Fig. 2, the endless carrier 1 on whichthe hides are placedv by the operator is adapted to be shifted by means of the electric motor B which drives the drum 2. A friction clutch arrangement is provided between the drum 2 and the worm and gear driven by the motor B. A limit switch L for controlling the operation of the motor A which drives the embossing roller is directly connected to and operated synchronously with the drum, 2 driven by the motor The embossing roller 3 is adapted to be reciprocated back and forth across the embossing bed or plate 4 in-a plane at right angles to the plane of the drawing by means of the motor A through any suitable -mecha- "--nism such as a wormdrive (not shown).

' The embossing roller 3 is yieldingly supported by means of the springs 5. The limit switch P which controls the operation of the shifting motor B is shownas being geared to the motor A, although it will be readily understood that it can also be 010-.

erated in any well known manner, such as by the roll itself at each end of travel.

' qThe operations of the motors A and-B are coordinated by means .of my control arrangement shown diagrammatically in Fig.

1 so that when the embossing roller 3 has proceeded across the embossing plate 4 to a limit of travel where the roller is free from the hide, the motor A is deenergized and.

brought to rest by means of a dynamic braking action whereupon the motor B is energized to shift the hide forward a distance corresponding exactly tothe width of the embossing roller. thus shifted, the motorA is energ zed 'to operate in the reverse direction and return the embossing roller back over the embossing plate, thus embossing another section of the hide, this automaticmperati'on continu-- ing until the operator assumes manual control of the machine or until the source of supply to the motors is cut off. In order that the hide shall be shifted an xact dis tance corresponding to the width 0 the embossing roller I have provided an electromagnetically actuated dog 6 which" is well known manner.

After the hide h s been ture circuit of the motor A is an acceleratthereby avoided. The coil 8 is energized responsively to the energization of the motor B and is deenergized simultaneously with the .motor B so that the dog 6 can move out of engagement with the projections 7 and thereby permit the motor B to again move'the hide when the embossing Iroller has completed its next movement across the embossing plate and become free from engagement with the hide 9.

Referring to Fig. I the motor A which drives the embossing roller 3 back and forth across the embossing plate is shown as having an armature 10, shunt field 11, and a commutating field 12. This motor is energized to operate in the forward direction by means of the electro-magneticall actuated switch or contactor F, and in t e reverse direction-by means of the electromagnetically actuatedswitch or contactor R. The

normally closed contactor-Dis adapted to be closed in accordance thebias'of the spring d-when' the conta'cters and R are open and include the motor l 'armature and commutating field in a dynamic braking cir-' cuit including the resistance 13," this clrcuit being maintained closed until the motor has been brought substantially to rest by means of the spring (land the coil of the contactor D energized responsivly to the armature voltage of motor A. A system of'pivoted mechanical interlocks l4 and 15 is provided for opening the dynamic braking contactor D against its bias when. either one of the contactors R1 or F is closed, the interlocks likewise preventing the simultaneous operation of both the contactors R and F, in a Included in the armaing contactor '16 of the well known series type, adapted to be "maintained opened as long as the armaturecurrent at starting is above a predetermined value,- and to close, short circuiting the'startingresistance 17,-

when the current has dropped below this predetermined value. the motor armature circuit and the rheostat The rheostat 18 in 19 in the motor shunt field circuit are provided for varying the speed of the motor in I a well known manner.

The motor 'B which drives endless carrier adapted to engage projections 7 on the drum 1 is'adapted to be energized from the source lay which controls the energization of the coil 8 provided for operating the dog 6, the

arrangement being such that after the con-' tactor 22 is closed the movement of the plu n ge'r of the time limit. relay is retarded by means of the dash pot 26 so that the coil' 8 will not be energized until a predetermined v. interval after the closing of the contactor 22.

The limitswitch L, directly connected to and operated synchronously with the drum 2 has a plurality of contactvsegments which engage stationary contacts for controlling the energization of the contactors R and F. This limit switch L is moved to the next operative position each time the motorB completes its movement of shifting, the hide, (the number of operative positions depending on thenumber of projections 7 on the drum 2) and the coil of either one of the contactors R or F is thereupon energized to close its switch contacts and energize the motor to operate in a reverse direction from that previously operated. The limit switch P, shown as being geared to the motor A is moved to a new operative position when the embossing roll has reached an end of travel. When the limit switch P is thus moved, the motor A is deenergized, and connections are made whereby the next operation of the limit switch L will reverse the motor A, and

the motor B is energized so that the hide a may be shifted. ,The manually/"operated switch 27, which will ordinaril be a snap switch, although not so shown 1n the drawing, is provided for quickly deenergizing the motors and stopping the machine atthe will of the operator. The manually operated push buttons 28 and 29 are .provided for controlling the energization of the coils of contactors R and F so that the motor A may be energized for operation in one direction, stopped or reversed-at the will of the operator. By means of the switch 27 and. the push buttons 28 and 29 the-operator is able to movethe embossing roller back and forth acrossthe embossing plate, independently of the positions of the limit switches L and P.

As thus constructed-and arranged the operation ofmy invention is as follows:

It will be assumed that the embossing rol I 3 is at a limitof travel'and that the hide 9 has been placed on the endless carrier 1 in a position so that the next operation of or contacshifting the-hide will bring it into proper position between the embossing roll and'the embossing plate. The manually operated switch 27 will first be moved to the right i at the position where the left hand blade of the switch makes engagement with the -middle contact. This is to insurethat the machine will not start operating until the operator desires after he has closed the line switch'30. -After the line switch 30 'has been closed the switch 27 can be moved to the left to the position shown in the.

drawing, whereupon the coil of the line.-

contactor 22 will be energized through .a circuit from the supply conductor20, the

left hand blade of switch 27, contacts of 'limit'switch P right hand blade of switch 27, auxiliar switches 23 and 24 to the other supply con uc'tor 21. The contactor. 22 will 7 close, energizing the motor B from the source of supply and causing the endless carrier 1 to be shifted so as to move thehide into proper position between-the emclosing of the contactor 22 also energizes the coil 25 of the time ,limit relay and the plunger of this relay will be moved upward against the retarding influence of the dash pct 26. After an interval determined by the'setting of the dash pct 26, the relay will close its contacts and energize the coil 8 of the restraining device, but this coil will not be energized untilfafter the first projection 7 on the drum 2 hasibeen cleared. When the motor B has shifted the hide the exact distance correspondingto the width of the.

bossingvplate and the embossing roller; The

embossing roller, thedog 6 will engage the next projection 7 and thus arrest any further movement 'of the hide, the friction clutch drive between the motor andthe drum 2 permitting a slippage between the drum and the drive connection. that the motor 13- shall be. deenergized a to the-new position, and this is brought about by means of the limit switch L which is driven from the motor B. After vthe motorB has shifted the 'hide a predetermined distance the limit switch L will have been moved so as to make engagement with thecontacts' 32, 33 and break the engagement. with the contacts 34, 35. This will cause thecoil' of reversing-contactor R to be energized through a circuit from the supply conductor 20, left hand blade of It is intended" short interval after the hide has been shifted switch 27, limit switch'Pfcontact 32, limit switch L, contact 33,v to the other supply conductor; 21.- The contactor R is thereby closed energizing the motor A from the source of supply. The closing of contactor R will open the dynamic braking contactor D'by means of the interlock 14, and the auxiliary switch 23 will be 7 opened thus fopening the ;coil circuit of contactor 22, causing this contactor to open and disconnect the motor B from the source of supply. The motor A will therefore start and when the current in its armature circuit has dropped to a predetermined value the series contactor 16 will close, short circuiting the starting resistance 17 and accelerating the motor to the full speed as determined by the setting of the rheostat 18 in the motor armature circuit and the rheostat 19 in the motor field circuit. The embossing, roll will be moved back over the embossing plate and thus emboss a section of the hide. When the roll has completed its operation in this di rection and is free from the hide, at a predetermined limit the movement of the limit switch P' to the next operative position is completed, thereby dee'nergizing the coil (if the contactor R and permitting this con- 7 tactor to open at the same time closing the 20- auxiliary switch 23. Likewise, connections are made through the limit switch P so that when the limit switch L is next operated the motor A is reversed. As soon as the contactor R opens, the dynamic braking co-n-, tactor D will be closed in accordance with its bias and connect the armature of motor A in a dynamic braking circuit including the resistance 1 3, thus bringing the motor A and the embossing roll to rest quickly. The closing of the auxiliary switch 23 will complete the circuit to the coil of contactor 22 and this contactor will be energized to close, connectingthe motor B to the source of supply so as to again shiftthe hide in the same manner as that previously explained. After the hide has been shifted the limit switch L will have been moved so as to energize the conta'ctor F and thus reverse the motor A and cause the embossing roll to be returned across the embossing plateand emboss another section of the hide. This automatic operation of the various parts of the machine and the control equipment" will proceed without any attention from the operator and his attention can be directed entirely to an observation of the embossing operation and to placing new hides on the endless carrier. i

In case the operator should desire at any time to arrest the operation of the machine, he can do so by simply moving the switch 27 to the right,-thereby deenergizi both motors. After he has done this e can control the operation of the machine at will by means of the push buttons 28 and 29; thus, by pressing the push button 29 the coil of the contactor R can be energized and the motor A-operated to cause the emto cause the motor A to operate in the other direction. Pressing both push buttons simglyflop ens the circuits to both contactors.

y means of these push buttons and the switch 27 the operation of the machine can be controlled at the will of the operator independently of the limit switches L and P. When the operator desires that the automatic operation of the machine shall proceed all that he need do is to release the push buttons 28 and 29 and move the switch 27 to the left, the position shown in the drawing. The circuits made by the operation of thepush buttons 28 and 29 are easily traced and it is thought that they will be readily perceived by an inspection of the drawing.

While I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which isset forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United States 1s:-

1.-.The combination with a machine having an intermittently operated mechanism, of an electric. motor for operating the same, a second intermittently operated mechanism cooperating with the first mechanism, an electric motor for driving the same, a mechanical stop for accurately stopping the second mechanism after a predetermined travel, a switch operated by each motor for controlling the other motor, and connections whereby the motors are operated in succession.

2. The combination with a machine having a reciprocating mehanism, of an electric motor for reciprocating the said mechanism, a second mechanism cooperating with the first mechanism and an electric motor for operating the same, a limit switch for each of said motors operated by the other motor, electromagnetic switches and connections controlled by' the said limit switches for automatically stopping and reversing thefirst motor when the first mechanism reaches an end of travel and energizing the second .motor to shift the second mechanism before the first motor is reversed after it is stopped, means energized responsively to the energization of the secondmotor to arrest the movement ofthe second mechanism after it has been shifted a predetermined distance, and manual control means including a plurality of push buttons for controlling the energization of the first motor and the movement of the first mechanism independently of the said limit switches.

3. The combination with two electric motors, of controlling means for the same comprising limit switches, each limit switch operated by one of the motors to control the operation of the other motor, switchmechanism controlled by the limit switches, and connections whereby the one motor is antomatically periodically reversed at predetermined limits of travel and the other motor is automatically energized to operate.

during a predetermined interval before the one motor 'is reversed after this one motor has reached a predetermined limit of travel.

4. The combination withtwo electric motors, of controlling means for the same comprising limit switches each limit switch operated by one of the motors to control the operation of the other motor, switch mechanism controlled by the limit switches, con nections whereby the one motor is periodically reversed at predetermined limits of travel and the other motor is automatically energized to operate during a predetermined interval before the one motor is reversed after this one motor has reached a predetermined limit of travel, and manually operated control means inclnding a plurality of push buttons for controlling the said switch mechanism independently of the said limit switches whereby the one motor is started, stopped or reversed with its relation to the other motor preserved.

In witness whereof I have hereunto set my hand this 28th day of May, 1917.

WILLIAM G. TAYLOR.

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