US1437018A - Motor controller - Google Patents

Description

T. H. RODMAN.

MOTOR CONTROLLER. APPLICATION FILED FEB. 21. 192].

Patented Nov. 28, 1922.

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T. H. RODMAN.

MOTOR CONTROLLER. APPLICATION FILED FEB. 21, 192i.

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T. H. RODMAN. MOTOR CONTROLLER.

APPLICATION FILED FEB.2I,192I.

Patented Nov. 28, 1922.

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Patented Nov. 28, 1922.

UNITED 1 STATES T HOMAS,H. RODMAN, OF NEW YORK, N. Y.,

ASSIGNOR TO THE CUTLER-HAMMER MFG.

CO., 01: MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

- v moron CONTROLLER.

Application filed Feb ruary 21, 1921. Serial No. 446,655.

To all whom it my concern:

Be it known that I, THOMAS H. RonMAN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Motor Controllers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

Thisinvention relates to motor controllers and while not limited thereto is particularly ap licable to controllers for printing presses. n my copending application, Serial No. 406,505, filed August 27, 1920, there is disclosed a controller particularly designed for printing press service wherein provision is made tonecessitate operation of a special safety switch prior to restarting by the usual startlngmeans following stopping by other than the inching means. More specifically such controller is provided in addition to the usual on and inch push button switches with a so-called reset phsh button switch and the arrangement is such that when the press is stopped in any one of various ways the reset button must be pressed prior to starting by either the on or inch buttons. However,the arrange ment enables inching in the usual manner after once depressing the reset button, i. e., without repeated depression'of the latter button for each step of inching operation.

The present invention has amongits objects' to provide a controller including similar control instrumentalities co-ordinated to' further require depression of the reset button for each step of inching operation.

Another object is to provide for such coordination of elements when so desired by a very slight modification of the controller disclosed in my. aforementioned copending ap plication.

' Another object is to providefor co-ordination of the elements either to necessitate starting within a limited period following operation of the reset switch or to permit delayed starting followingoperation of the reset switch, as may be desired.

Other objects and advantages of the invention will hereinafter appear.

. The accompanying drawing illustrates a controller embodying the invention in one form and the same will now be described, it

being understood that the controller illustrated is susceptible of various modifications "without departing from the scope of the ap- Fig. 1 in a manner to facilitate an understanding thereof; and

' Fig. 6 is a diagrammatic view illustrating a modification.

'Referring to Fig. 1 the controller illus trated therein is, with certain additions,

identical with that disclosed in my copend-I r Fig. 2 as comprising a small motor=M and a large motor M. This controller comprises an electro-responsive main switch 1' for the small motor, an electro-responsive main switch 2 and dynamic brake switch 3 for the large motor and a crosshead type rheostat R driven by a-pilot motor M to control said switches and to further control an armature resistance r and a field resistance 1- for the large motor M, the resistance 1- being omitted from Fig. 1 but its contacts being illustrated therein and designated by the same reference character. An on relay 4 is provided to effect operation of the pilot motor for starting the motors M and M successively and for accelerating the latter while an off relay 5 is provided to effect reverse operation of the pilot motor. Also the controller includes a stop relay 6 to sto both motors, an inch relay 7 to start and stop the small motor M, a safe relay 8 to render all of the aforesaid relays inoperative, a paper-break relay 9, and signal relays 10 and 11, all of said'relays being under the control of a push-button station comprising an on switch 12, a stop switch 13, an off switch 14:, a safe switch 15, aninch I swltcn 16, and a reset switch 17. While Fig. l'shows but a single control station a plurality thereof maybe provided as will hereinafter appear. This controllerdifi'ers from that disclosed in my copending application aforesaid only in the addition of down-contacts 7 provided "on'the inch switch to control a circuit hereinafter described.

The switches 1 and- 2 are preferably em- "ployed to; establish the -motor connections shown in Fig. 2, each of said switches being "of the double pole: type and having down contacts coacting to establish a dynamic braking circuit for its respective motor.

7 Each motor is shown as comprising an armature w, a series field the motor M having 11D. circuittherewith: the

and a shunt field f,

armature resistance 1- and field resistance r to be controlled by the. motor-driven crosshead. Also the-motors M and M, are shown 'as respectively provided with resistances r and 1' in thedynamic braking circuits there of, the motor M having included in the dynamic braking circuit switch 3 which is of thenormally closed type.

" The on and ofi' relays respectively establish the. circuit connections for the pilot motor shown in Fig. 3,-the pilot motor he-' ing shown therein as com rising an arm: ilteferring to this 'figure, it will be observed that'the on re-;.

ture a and a-series field f.

' lay 'whichis of the double-p'oletype estab-' lishes connections whereby current fiows through the armature and field inreverse 4 directions whereas the toil? relay, which is of a similar type establishes connections fora unidirectional .flow oi current through both the armature and field. 4:0

The rheostat R has a main crosshead 18 and an auxiliaryxcrosshead-19 the former coacting with contacts to control resistance This figure shows such auxiliary contacts r and r and the latter coacting with auxiliary contacts .to control the windings of swltches 1 to? as best illustrated in Fig. 4.

and as will be observed the auxiliary crosshead 19 in its extreme position serves to connectcontacts 20, 21 and 22 for connec- 'tion of both the small motor switch-1 and I I 1 large motor dynamic brakeswitch 3'across the line-through the Finch? relay 7', paper.-

break relay 9 and stop relay 6, relay 7 '1 being normally open and relays 9' and 6 be- 1Ilg normally closed. Thus in. this position I of the crossheadtheismall motor may be ,operated for inching byenergizing relay 7.

On the other}hanol"iwhen the rheostat is operated crosshead 19 leaves contacts 20,

21 and-22; interrupting the circuit through ,the inch? relay andinserting in'terlockin resistances e and 1' in circuit with the 'win ings of: switches 1 and I 3 respectively to -necessitate return or the '{crosshead to initial positiontor re-energization of said switches following de-energization' thereof.

Upon initial movement of the crosshead 19 the same engages and bridges contacts 23,

24l and 25 which, assuming previous energization of switches l and 3, provides maintaining circuits therefor through auxiliary contacts 1 of switch 1 (Fig. 1). As will hereinafter appear, the inch, relay is energized by closure of the on relay and thus both switches 1 and 3' are energized when the crosshead19 is .first moved and the former switch is maintained energized until said crosshead'dis'engages contact 23. Prior Y thereto the crosshead 19 engages contact 26 to complete the circuit of the large motor switch through the auxiliary contacts l" of switch 1 and before disengaging contact 25 the crosshead engages contact 27'to parallel said auxiliary contacts by auxiliary contacts 2*; of switch'2 (Fig. 1). Thus the auxiliary crosshead provides for starting the motors successively. and de-energizing the main switch of. the small motor after starting the large motor while maintaining the large motor switches2 and 3 energized throughout the remainder of its movement,

switches 12 are connected in parallel and each-serves to connect the winding of the on relay 4 across the line through the normally closed.safe relay 8 and down limit switch 28 of the rheostat (Fig. 1.)!5. Thus the on relay 4 is rendered responsiveto either on switch to complete the pilot rnotor connections as described while its (Fig. 1) parallel the auxiliary contacts 4 inch-'swit ches 16 '(Fig. 5) to energize the inch. relay, for starting of the small motor and energization of the dynamic brake switch 3 of the large motor as above set forth.

The of? switches 14 as shown in Fig.5 are also connectedin parallel and each serves to connectthe winding of the ofi relay 5 across the .line through the safe relay 8 and up limit switch 29 of the rheostat (Fig.,

1)." Thus the ofi relay ,isresponsive to either oft? switch to complete the pilot motor connections as above described for slow down. The 1'nch switches 16 as shown n Fig."

5 liave down contacts connected in parallel I and either, is adapted to be depressed to l connect the winding Oli -the "finch" re lay 7 -across the line through "sate relayl llm 8 whereby the inch relay is rendered responsiveto start the small motor as above described. Also the inch switches 16 have up contacts connected in series and said each of which is adapted to be normally held open by the paper passing through the press subject to release upon breakage of the paper. Thus with the inch switches '16 in normal position release of either paper-break switch 30 energizes paperbreak relay 9 to stop the motors as above l described. On the other hand depression of either of the switches 16 for inching interrupts the circuit of the paper-break relay thus permitting the press to be inched for rethreading or to be operated at a higher speed if desired by operation of one of the on switches 12 in addition to .the inch switch 16.

The safe switches 15 as shown in Fig.-

5 are connected in parallel and either is adapted to be set to connect'the winding of safe relay 8 directly across the line for energization of said relay to disconnect the windings of the on, off and inch relays from line L. Such setting of the safe switch thus renders all control stations ineffective to start. 1 However, such setting of the safe sw1tch requires a manual operation inaddition to the operation of stopping as will appear.

The stop relay 6 is normally closed (Figs. 1 and 4) and requires depressionof a stop switch 13 for stopping at will. As'

shown in Fig. 5, stop switches 13 are con- I nected in parallel and either is adapted to be and M are respectively depressed to connect the winding of stop relay 6 across the line through upper contacts of the reset switches 17 which are connected in series. This energizes the stop relay to stop both motors as above set forth and said relay has auxiliary contacts 6* (Fig. 1) which upon response thereof parallel the off switches 14 as shown in Fig. 5 to effect return of the rheostat crossheads to their initial positions.

The main switches 1 and 2 for the motors M rovided with auxiliary contacts 1 and 2" ig. 1) which upon opening of said switches parallel the stop switches 13 (Fig. 5) throu h an up limit switch 31 of the rheostat ig. 1) thereby energizing the stop relay whenever both motors are stopped as-for example by the paper break relay.

Thus the stop relay. is energizable in a number of diflerent ways for stopping and upon response thereof its auxiliary contacts 6 (Fig. 1) ,establish a maintaining circuit therefor through the upper contacts ofthe reset switches 17 and a resistance r". In consequence the stop relay also functions starting in response to either the on automatically as a safe relay requiring operation of one of the reset switches 17 to de-energize the same before the motors M and M can be restarted either by the on switch or the inch switch. In this connection it is to be understood that any num-.

ber of reset switches may be provided there preferably being one for each control lay 8 as shown in Fig. 5 and this relay as shown in Fig. 1 serves to connect across the line an electric hor'n 32 or other audible signal device and one or morellamps 33 having in circuit therewith a flasher 34. Thus when either reset switch 17 is operated to make ready for starting it functions to give both an audible and a visual signal and it may be operated at any time to give such signal even though its operation is not required for control of the stop relay. As shown the signal relay 11 has down contacts 11 also functioning to energize the lamps 33 and to shunt the flasher 34 when the press is idle.

For additional protection a red light 35 (Fig. 1) is also provided, the same being under the control of relay 10. This relay as shown in Fig. 4 has its windin connected across the line through the sa e relay 8 on the one side and the paper-break and stop relays on the other side whereby it is energized to complete the circuit of the red light whenever the, controller is ready for switch or the inch switch.

As shown in Figs; 1 and 5, the downcontacts 7 which have been added to the inch relay 7. parallel the up limit switch 31 wherever said relay is de-energized. Thus it will be apparent that each time said re lay is de-energized in inching the stop relay is energized thus necessitating depression of one of the reset switches prior to restarting. Moreover, it will be apparent that in order to effect restarting the inch relay must be energized prior to release of the depressed reset switch as picted in Fig. '6.

Referring to Fig. 6 the same shows a portion ofthe diagram of Fig. 5 the only departure from the arrangement shown in the latter figure consisting in modification of the auxiliary contacts of the inch relay. 'In this instance said contacts comprise an element 7 co-operating witha contact 7 to parallel the up limit switch 31 as described. The

' tact and then disengage the latter.

contact element 7 is provided for actuation by the inch relay, it being biased to disen= gage contact 7 when said relay is de-energized and being movable upon response of said relay to momentarily engage said con- During such operation theengagement of element 7' energization of the inch relay and a dash pot 36 is connected to said element to proa position permittin long itsre-engagement with contact 7 for efiecting response of the stop relay. Thus thecontacts 7 and 7 function like the contacts 7* to energize the stop 'relay whenever the inch relay is de-energized but unlike contacts 7* they thereafterassume the reset switches to be depressed to e-energize the stop relay and then released Without re-energizing the latter relay regardless of the position of the inch relay. Accordingly as the contacts T 'and 7 do not engage for a suffici'ent periodof time uponresponse of the inch relay to energize the stop relay restarting is not defeated by release of the depressed reset switch ,prior'to energization: of the inch relay.

- What ll claimasnew' and desire to secure by Letters Patent is e 1. In a motor controller, the combination f with starting and stopping means including manually operable start, stop and inch con- ,trol elements, of means requiring manual 'operation'of a part thereof to render said start and'inch-control elements effebtive for i restarting following: stopping operation by said inch or stop control elements. 2. In a motor controllerthe combination with starting and stopping means including a plurality of control stations each having start, stop and inch eleinents,.of a plurality elements effective-for restarting following stopping operationv of any one of said inch or stop elements. V

, 3. In a. motor controller, the combinationoff additional control elements and connections' between said meanszand the latter con trol elements necessitating'operation of one of the same to render'said start and inch 1 with starting and stopping means including a-manually' operable control element to effect inching,of means requiring 'manualoperation of a part thereof .to render said element effective for inching following each stopping operation thereof. 1 g Y 4:. In a motor. controller the combination with starting and stopping means including a manually operable control element to effect inching,- of means requiring manual opera tion of a part thereof to render the former means effective for restarting following each release therefrom at will power operated starting'and stopping means, a plurality of control stations for said means each including start, stop, inch and reset.

control elements and connections between said means and said control stations to necessitate operation of'one of said reset elements prior to restartingby any one ofsaid start or inch control elements following stopping operation of any one of said stop or inch control elements, I

7. in a motor controller, in combination, power operated starting and stopping means including a stop relay, a control station for said means including start, stop, inch and reset elements and connections between said means and said station adapted upon stopping operation of said inch or stop elements to cause said relay to move to stop position and to remain in such position but subject to by said reset element.

8, in a motor controller, the combination ,With power operated starting and stopping means including a stop relay to be energized for stopping and acting upon continued energizatlon thereof to prevent restarting, of 'a control. station for said means including "start, stop, inch and reset switches and circuit connections to effect response of said relay upon stopping operation of said inch or; stop switches and to thereupon maintain said relay-energized but subject to deen'ergization of said relay at will by said reset element each including start, stop,- inch and reset switches and circuit connections to efi'ect en- 9. In a motor controller, the combination 'ergization of said relay upon stoppingoperation of any one of said inch or stop switches and to thereupon maintain said relay energize'dbut subject to de-energ'ization thereofat will by any one of said reset switches.

, 10. in a motor controller, the. combination with starting and stopping means including a stop" relay to be energized for stopping and an inch relay, of means including a manually 3 controlled element and contacts associated With said inch relay to control said stop relay whereby said relay is maintained ener 5 gized to prevent restarting following any stopping operation of the first-mentioned THOMAS H. RODMAN.

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