US2252762A - Drive for printing presses and other machines - Google Patents

Description

19, 1941- c. P. FELDHAYUSEN 2,252,762

DRIVE FOR PRINTING PRESSES AND OTHER MACHINES Filed March 31, 1.959

Patented Aug. 19, 1941 DRIVE FOR PRINTING PRESSES AND OTHER MACHINES o rn r. Feldhausen, Wauwatosa, Wis., asslgnor,

to Cutler-Hammer, Inc., 'Milwaukee, Wis., a.

corporation of Delaware Application MarchBl, 1939, Serial No. 265,155 Claims. Cl. 172-239) This invention relates to improvements in drives of the two motor type for printing presses and other machines.

For printing press drive it has been found very advantageous to employ a double motor drive comprising a large motor for running, and a small motor for starting, inching and operating the press at threading speed. In such' drives it has been the common" practice to employ an overrunning clutch to enable the large, motor to take over the drive while the small motor is operating and to free the small motor upon overrunning by the large motor. This type of drive is very satisfactory for drive of the press in a single direction but there is now a demand for reversibility of the two motor drive and use of an over-running clutch presents difllculties.

The presentinvention has among its objects to provide a simple and highly satisfactory two motor drive having reversibility and the .advantages of the aforementioned drive, the eliminating need of an over-running clutch.

Fig. 4 is a more or less schematic view showing the small motor supported by the large motor with the armatures of said motors axially aligned;

Fig. 5 is a diagrammatic view showing power connections for the two motors; and

Figs. 6, 7 and 8 are diagrammatic views showing with certain variations control means for the two motors, and the magnetic clutch associated with said motors.

Referring to Fig. l, the same shows' a large motor M and a small motor M which'in practice might be mounted on a common base. The large motor has a. shaft extension i to be connected to the press or other driven machine in any preferred manner as by a chain drive. The opposite end of the shaft of the large motor is connected through an electromagnetic clutch C to a gear 2 meshing with a smaller gear 3 carried by an in- Another object of the invention is to provide a two-motor drive wherein reversibility is enabled through the use of an electromagnetic clutch in lieu of the heretofore employed over-running clutch.

Another object of the invention is to provide a two-motor drive wherein one or both motorsmay be provided with individual brakes or the large motor may be braked through the medium of the aforementioned electromagnetic clutch, assuming the small motor to be prevented from rotating.

Another object is'to afford through use of an electromagnetic clutch tarnsfer of the drive from one, motor to the other smoothly, without undue shock to the driven machine.

Various other'objects and advantages of the invention will hereinafter appear.

Certain-embodiments of the invention are illustrated in the accompanying drawing which will now be described, it being understood that the embodiments illustrated are susceptible of modification without departing from the scope of the appended claims. r In the drawing, Figure 1 is a more or less schematic view of Fig. 2 is a more or less schematic view showing a modification of Fig l;

'" Fig. 3 is a more or less schematic view showin v large motor;

termediate shaft 4. The shaft 4 has mounted thereon and coupled to gear 3 a gear 5 meshing with a smaller gear 6 on the shaft of small'mo tor M The electromagnetic clutch C may be of any one of a number or well known types, bein preferably of the friction disk type energizable for clutching and deenergizable for release. Assuming use of such a clutch when it is energized it affords a drive from the small motor M through the aforedescribed gearing and clutch to the shaft of the motor M and through the extension I of said shaft to the press or other" driven machine. On the other hand, when the clutch C is deenergized the drive from the small motor is interrupted, leaving only the large motor M connected to the press or other driven machine.

a driving mechanism wherein the two motors are arranged to be fixed to acommon support;

The small motor as in the ordinary drive preferably is designed for starting under the load of the press or other ma ine and after transfer of the load to the large motor the small motor preferably is disconnected from circuit. When the large motor is driving, the load maybe re-transferred to the small motor by bring n the large motor to a suitable-speed, and then disconnecting the large motor from circuit, at the same time energizing the clutch C. 1n transferof the load from one motor to the other the slipp e of the clutch will tend to eliminate the shocks, if any, to the driven machine due to difference in speed of the parts driven by the two motors.

Further referring to Fig. l, thesame schematically shows brakes B and B for the large and small motors, respectively. These brakeslmay be of any preferred type and controlled in any preferred manner. If the large motcr is of a type adapted to be plugged then plugging may be employed in lieu of brake B. Furthermore the brake B may be-dispensed with and braking of the motor M may be effected by braking the small motor M and energizing clutch C. The clutch C will then gradually brake the motor through friction of the engaging parts which initially will slip- Referring to Fig. 2, the same shows the clutch C mounted on extension I of the large motor shaft. The clutch has its field member c fixed to the shaft, and its armature member c fixed to the gear 2, said gear in turn having a bearing on the bell of the motor.

Referring to Fig. 3, the large motor M is provided with a bracket 3 to support the small motor M and the clutch C is mounted on the shaft of the large motor, being provided with a pulley I connected through a driving belt 3' to a pulley ll provided on the shaft of the small motor. This arrangement wherein the small motor is mounted on and above the large motor is particularly advantageous where economy of floor space is important.

Referring to Fig. 4, the large motor M is provided with a bracket I I on which the small motor M is mounted in axial alignment with the large motor. In this case it is assumed that the small motor is of a geared head type, the clutch C constituting a direct coupling for the shaft of the large motor and the small motor.

It is to be understood that the motors may be of any preferred type, either D. C. or A. C. However, for simplicity of illustration of the power connections (Fig. use of DC. motors is assumed. Referring to Fig. 5, the motor M is illustrated as comprising an armature A and a series field winding F, while the motor M is illustrated as comprising an armature a and a series field winding 1. Reversing switches I2 and I3 are provided for the armatures a and A respectively. While the reversing switches l2 and l3 are shown as of the knife switch type it is to be understood that any other preferred type of reversing switches either manual or power operated may be substituted therefor. Also Fig. 5 shows the circuit of motor M provided with an electroresponsive main switch l4 'and the circuit of motor M provided with an electroresponsive main switch I! having normally closed auxiliary contacts |I for a purpose hereinafter set forth. As illustrated the motors are reversible independently of one another, but it is of course to be understood that if desired provision may be made whereby reversal of either motor effects reversal of the other motor. In this figure the small motor brake B is depicted as a winding, assumed to be a brake releasing winding, having means to connect it across armature a.

Referring to Fig. 6, the same shows how the control of the two motors and the electromagnetic clutch may be accomplished in a very satisfactory manner by the crosshead type of controller extensively used for printing press control. For simplicity of illustration many details of the standard crosshead type of controller have been omitted from Fig. 6, and for further simplification certain switches are given more direct control of other switches illustrated than in the standard controller. However, the showing of Fig. 6 will serve clearly to indicate to workers in the art how control of the motors and the clutch readily may be incorporated in the standard controller for obtaining all advantages thereof. Fig. 6 shows the windings I4 and ii of the small motor main switch l4 and the large motor main switch i5, respectively, the winding 0 of the clutch C, a motor driven crosshead type controller 20, a "stop relay 2|, an inch relay 22, a clutch relay 23, relays 24 and 25 to control the motor driven rheostat and certain push button control switches hereinafter specified.

The crosshead type controller 20 is only shown in part, only the contacts thereof employed to control the continuity of circuit of the motors being illustrated. As will be understood, the crosshead in practice is additionally provided with contacts affording a wide range of speed control of the large motor and speed control of the small motor if desired. As illustrated the controller 20 comprises a crosshead 30, a series of contact buttons 3| aligned with contact strip 32 and a second smaller group of contact buttons 33 aligned with contact segment 34. As illus trated the buttons 33 are not connected together and have no connection with the strip 34, whereas the left hand first two buttons of the series 3| are disconnected from one another and from the remaining buttons. The next four buttons 3| are interconnected but disconnected from the remaining buttons, and the last two buttons 3| are interconnected and connected to strip 32. The strip 32 is connected to one terminal of the winding l5 of the large motor main switch, while the intermediate interconnected buttons 3| are connected to one terminal of the winding l4 ofthe small motorv main switch. The ex treme left hand button 3| is connected to line L through a push button switch 35, while the extreme left hand button 33 is connected to one terminal of the winding of the Pinch" relay 22. When crosshead 30 is in the position illustrated it enables energization of the inch relay 22 which upon closing completes a circuit from line L to a terminal of the winding i4 of the small motor main switch in shunt with the crosshead controller. On the other hand, when the crosshead moves to the right to bridge strip 34 with the first of the intermediate interconnected buttons 3| it completes a circuit from line L to the winding I4 of the small motor main switch in parallel to the aforementioned circuit established by the inch relay. Continued movement of the crosshead to the right maintains the circuit of the winding of the small motor main switch until said crosshead reaches the buttons 3| connected to strip 32 whereupon said crosshead completes circuit from line L to the winding l5 of the large motor main switch. Upon continued movement of the crosshead to the right it interrupts the circuit of the winding l4 while maintaining the circuit of the winding |5" of the large motor main switch.

Such operation of the crosshead 30 is effected through the medium of a pilot motor shown as comprising an armature 36 and oppositely wound series field windings 31 and 33 to be included in circuit selectively. I he aforementioned relay 24 when energized connects across lines L and L the armature 36 and the field winding 31 for operation of the crosshead 3|) in one direction, assumed to be to the "011 direction, while relay 25 when energized connects across lines L and L the armature 36 and the field winding 38 for operation of the crosshead in a reverse direction, assumed to be on direction. The windings of the relays 24 and 25 are in turn respectively controlled by push button switches 39 and 40.

Considering the controller thus far described, it

' motor.

turnof the crosshead to transfer the load from will be seen that with the crosshead It in the position shown the small motor M may be started by depressing the push button switch SI which is effective only in such position of the crosshead. On theother hand, the crosshead may be adjusted through depression of the "on button to establish the independent circuit for the winding of the small motor main switch and thereafter to establish circuit for the winding of the large motor main switch. The crosshead may be arrested on the intermediate buttons ll by release of the on push button switch for continuous operation of the the crosshead to the position shown by depression of the oii push'button switch to start and move the crosshead to the left or deenergization oi the small motor main switch otherwise as hereinafter explained. Similarly depression of the "oil" push button switch 39 provides for return 01' the small motor pending return of 1 inbeiore explained deenergization oi the crosshead when positioned to energize the wind- '20 ing of the large motor main switch, the return movement energizing the winding of the small motor main switch while the crosshead engages the intermediate interconnected contacts ii.

The stop relay has normally open contacts 2|", 2l and 21 and normally closed contacts2l. Contacts 21 arein circuit with the winding of "inch relay 22. Contacts 2 l are included in the common connection between line L and the windings of the main switches I4 and I! of the small motor and the large motor respectively. Contacts 2| are included in circuit with the winding of on relay 25. Thus when the stop relay 2| is deenergize'd it provides for immediate stopping irrespective of the position of the cross.- head by deenergizing the ther provides, for deenergization oi the inc relay if energized and for deenergization of the on relay if energized. On the other hand, deenergization of the "stop" relay' engages its contacts 2| which are in circuit with the winding of "oil relay 24, thereby eflecting return of the crosshead to initial position where it is arrested by a limit switch 4|. Alimit switch 42 arrests the crosshead when driven to its other limit. The winding of stop" relay is adapted to be connected across lines L and L by a push button switch 43 to be closed for running and opened for stop-' ping, said switch being adapted to remain in either open or closed position without manual retention.

The large motor main switch has its normally closed contacts l5 in circuit with the winding of clutch relay closed connect the winding of the clutch relay 23 acre the-lines, causing said relay to respond, to conn ct the clutch coil 0 acrossthe lines. On

the other hand,'opening of contacts I! deenergizes the clutch relay 23 .to disconnect the clutch coil 0 from circuit. I

With such circuit connections for the clutch coil '0 it will be apparent thatwith the motors at rest the clutch relay is energized to energize, .the clutch coil at the time starting is eflected' whether through the medium of the inching means or the "on" means. Thus at the instant of starting the small motor said motor is connected to the press or other driven machine. On the other hand, it will be observed that .when the large motor is started to take over the drive of the press or other machine the contacts ll of its main switch willzdenergize the clutch relay to de-. energize the clutch coil, thereby freeing the small Also it will be observed that upon rethe large motor to the small motor the contacts I! o! the large motor main switch will reclosetc again energize the clutch relay and thereby again energize the clutch coil 0.

The control 0! the trated, as its control is well understood. It the brake B is employed its controlling medium may, if desired, be provided with contacts in circuit with the winding of the clutch relay 23 to necessitate release of the brake for energization of said clutch relay. I 1 7 On the other hand, it the brake B for the large motor is not employed the system of Figs. 5 and 6 will aflord braking oi the large motor through the clutch when the large m tor deenergization oi the "s op" relay. As herest p relay deenergizes the large motor main switch and also the small motor main switch it energized. Deenergization of the main switch I! energizes the clutch as hereinbefore explained, and as will appear from Fig. 5" main switch ll disconnects the coil of brake B of the small motor. Thus the a small motor brake sets and the small motor main switches, and turbrakes the large motor through the clutch.

Where use of the clutch for braking is not '-desired the clutch circuit preferably is'modlfied as shown in Fig. 7. In this instance the energizing circuit 0! the clutch relay 2! includes in addition to contacts it of Fig. 6 contacts I!" and 24' connected in parallel and connected in series with contacts l5". Contacts ll are assumed to be normally open contacts of the small motor main switch ll, while contacts 24 are assumed to be normally closed contacts of o relay 24. Thus the clutch relay is rendered unresponsive to opening of the large motor main switch except when the small motor main switch has been closed for restarting the small motor or the ofi" relay has been deenergized after returning the crosshead 30 to initial position in preparation for again starting the drive.

II it be desired to in advanceof engagement of clutch C instead of after engagement of the clutch as in Fig.6 this can readily be accomplished by the modification shown in Fig. 8; In- Fig. '8 the energizing circuit of clutch relay 23 includes in addition to the large motor main switch contacts N and in series therewith contacts 14 assumed to be normally contacts of the small motor main switch ll.

open With this arrangement the clutch relay is energized to energize the clutch only when thelarge motor main switch is open and only when the small motor. main switch has responded to start,

the small motor.

cluding reversing means for said smaller motor and driving connections from said motors to the driven machine in part common to both motors and including a releasable connection through which said smaller motor drives, said releasable connection serving to transmit power from said smaller motor upon operation of the latter in either direction and having control means eflecting its release as an incident to starting of the other of said motors.

brake B of Fig. 1 is not ma is stopped through start the small motor slightly cluding means first 2. For printing presses and other machines, in combination, a driving motor for operation of the driven machine through a given speed range, a smaller motor for starting of the driven ma- "chine and for slow speed operation thereof, control means for said motors providing for starting always by said smaller motor and including reversing means for said motors, and driving connections from said motorsto the driven machine in part common to both motors and including an electromagnetic clutch through the medium of which drive from said smaller motor may be established and interrupted regardless of the direction of operation of said motors, said control means also including means for transferring -the driven machine through a given speed range,

a smaller motor for starting of the driven machine and'for slow speed operation thereof, control means including reversing means for said motors, and driving connections from said motors to the driven machine'in part common to said motors and including an electromagnetic clutch through the medium of which drive from said smaller motor may be established and interrupted regardless of the direction of operation of said motors, said control means also including means to effect starting pf said smaller motor with said clutch engaged and subsequent starting of the other motor while said smaller motor is in operation, effecting disengagement of said clutch to free said smaller motor upon initiation of starting of said other motor.

4. For printing presses and other machines, in combination, a driving motor for operation of the driven machine through a given speed range, a smaller motor for starting of the driven machine and for slow speed operation thereof, control means including reversing means for said motors and driving connections from said motors to the driven machine in part common to said motors and including an electromagnetic clutch through the medium of which drive from said smaller motor may be established and interrupted regardless of the direction of operation of said motors, said means to effect drive said smaller motor through said clutch and transfer of the drive from said smaller motor to the other of said motors, releasing said clutch for disconnection of said smaller motor as an incident to starting of the other of said motors, and thereafter to effect transfer of the load back to said smaller motor through reengagement of said clutch with said smaller motor in operation.

5. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor. and a larger motor an electromagnetic clutch for coupling said small motor to the shaft of said larger motor to drive the driven machine trol means for said motors and clutch including reversing means for both motors and also into effect starting of said small motor and engagement of said clutch and therecontrol means including of the driven machine by through said shaft, and conafter to start said larger motor while said small i motor is in operation and to disengage said clutch.

motor to the shaft of said larger motor to drive the driven machine through said shaft, and control means for said motors and clutch including reversing means for both motors and also including means first to effect starting of said small motor and engagement of said clutch and then to start said larger motor while said small motor is in operation and to disengage said clutch immediately upon establishment of power supply for said larger motor said last mentioned means insuring engagement of said clutch at the time said small motor is started.

7. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor and a larger motor, an electromagnetic clutch for coupling said small motor to the shaft of saidlarger motor to drive the driven machine through said shaft, and control means for said. motors operable first to start said small motor, thereafter during operation of said small motor to start said larger motor, stopping said smaller motor and thereafter to restart said smaller motor, stopping said larger motor, said means controlling said clutch for engagement thereof when only said small motor is operating, for disengagement of said clutch upon starting of said larger motor and for re-engagement of saidclutch upon stopping of said larger motor.

8. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor and a larger motor, an electromagnetic clutch for coupling said small motor to the shaft of said larger motor to drive the driven machine through said shaft, and control means for said motors and clutch including reversing means for both motors and also including means operable to effect in sequence starting of said small motor, starting of said larger motor while said small motor continues to operate, stopping and restarting said small motor while said larger motor continues to operate, and stopping of said larger motor, said last mentioned means controlling said clutch for engagement thereof when only small motor is operating, for disengagement of said clutch simultaneously with starting of said larger motor and for re-engagement of said clutch when said larger motor is disconnected from circuit with said small motor in operation.

9. For printing presses and other machines, in combination, a two motor drive, comprising a relatively small motor and a larger rnotor, an electromagnetically engaged friction clutch for coupling said small motor to the shaft of said larger motor to drive the driven machine through said shaft, and control means for said motors and clutch including reversing means for both motors and also including means to effect operation of said motors selectively, starting the larger motor prior to stopping the small motor and vice versa, and at substantially the same time effecting disengagement or re-engagement of said clutch according to whether the transfer of load is from the small motor to the larger motor or vice versa- 19. For printing presses and other machines,

control means for said motors operable first to start said small motor, thereafter during operation of said small motor to start said larger motor, stopping said small motor and thereafter to restart said small motor while saidlarger motor continues to operate and then stopping said larger motor, said means controlling said clutch for engagement thereof when only said small motor is operating, and for disengagement of said clutch upon starting 01' said larger motor and until the power supply to said larger motor is terminated.

11. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor and a larger motor, an

electromagnetically controlled friction clutch for coupling said small motor to the shaft of said larger motor to drive the driven machine through said shaft, a brake for said small motor and control means iorsaid motors, said clutch and said brake to eilect drive of the driven machine through said clutch by said small motor and to effect operation of said larger motor and disengagement of said clutch for transfer 'of the drive from said small motor to said larger motor, said control means providing for setting of said brake of said small motor and for "re-engagement oi. saidclutch to brake said larger motor.

12. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor and a larger motor, an

'electromagnetically controlled friction clutch for coupling said small motor to the shaft of said larger motor to drive the driven machine through said shalt, a brake for said small motor and control means for said motors, said clutch and said brake to effect drive 01' the driven machine through said clutch by said small motor.and to eiifect operation of said larger motor and disengagement of said clutch for transfer oi' the drive from said small motor to said larger motor, said control means including reversing means for both motors and means to effect setting of said brake of said small motor and re-engagement of said clutch to brake said larger motor.

13. For printing presses and other machines, in combination, a relatively small driving" motor, a larger driving motor, driving connections from said motor to the driven machine in part common to both of said motors, said connections including a releasable connection for said small .motor, which releasable connection serves to transmit power from said small motor upon operation of the latter in either direction. and control means for said motors and said connection including reversing means for said small motor, means for effecting operation of said motors selectively or simultaneously and for controlling said releasable connection for transfer of the drive from said small motor to said larger motor or vice versa, while protecting against power drive by both motors simultaneously.

14. For printing presses and other machines, in combination, a two motor drive comprising a relatively small motor and a larger motor, driving connections from said motors to the driven machine, the driving connections from said small motor including an electromagnetic friction clutch, and control means for said motors and said clutch operable first to start said small motor with said clutch disengaged and said larger motor idle, then to engage said clutch and then to start said larger motor for drive of the machine disengaging said clutch as an incident to establishing power supply to said larger motor.

15. For printing presses and other machines, in combination, a relatively small driving motor, a larger driving motor,- driving connections from said motors to the driven machine including a releasable connection for said small motor which mechanically connects said small motor and said larger motor and which when released interrupts the drive from said small motor, a brake for said small motor, and control means for said motors, said releasable connection and said brake, and said control means effecting drive of the driven machine by said motors selectively and braking or said larger motor by mechanically connecting said motors through said releasable connection and applying said brake to said small motor.

CYRIL P. FEIDHAUSEN.

CERTIFIQATE 0F CORRECTION.

, Patent No. 2,252,762. August 19, 191 1.

CYRIL P FELDHAUSEN It is hereby certified that error appears'in the printed specification of the above numbered patent reqixiring correction as follows: Page 1, first column, line 21, for' the read -but--; page 5, second column, line 11.9, for "contacts 114 read "contacts 15 and that the said Letters Patent should be read with fills correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2 121 day of April, 'A. D. 19h2.

. Henry van Aredale, (Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

,Patent No. 2,252,762. August 19, 191 1.

CYRIL P. FELDHAUSEN.

It is hereby certified that error eppears'in the printed specification of the above numbered patent requiring correction as follows: Page 1, first column, line 21, for'the" read --but-; page 3, second column, line 149, for contacts Ill-L read "contacts 15 and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office- Signed and sealed this age; day of April, 'A. D. 19142.

Henry van Aredale, (Seal) Acting Commissioner of Patents.

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