US2017641A

US2017641A - Safety driving mechanism and current breaker therefor

Info

Publication number: US2017641A
Application number: US704648A
Authority: US
Inventors: George J Uhlig
Original assignee: Victor Adding Machine Co
Current assignee: Victor Adding Machine Co
Priority date: 1933-12-30
Filing date: 1933-12-30
Publication date: 1935-10-15
Anticipated expiration: 1952-10-15

Description

G. J. UHLIG Get. 15, 1935.

SAFETY DRIVING MECHANISM AND CURRENT BREAKER THEREFOR Filed Dec. 30, 1953 6 Sheets-Sheet l G. J. UHLIG Oct. 15, 1935.

SAFETY DRIVING MECHANISM AND CURRENT BREAKER THEREFOR Filed Dec. 30, 1933 6 SheetsSheet 2 G. J. UHLIG Get. 15, 1935.

\ SAFETY DRIVING MECHANISM AND CURRENT BREAKER THEREFOR Filed Dec. 30, 1935 6 Sheets-Sheet 5 w Hy 1935- G. J. UHLIG 2,917

SAFETY DRIVING MECHANISM AND CURRENT BREAKER THEREFOR Filed Dec. 30, 1955 6 Sheets-Sheet 4 Q5 AT 6 Sheets-Sheet 5 GhJ.UHLH3 Filed Dec.

Gm, 15 W35.

SAFETY DRIVING MECHANISM AND CURRENT BREAKER THEREFOR ct "E5 1935. G. J. UHLIG 2,017,641

SAFETY DRIVING MECHANISM AND CURRENT BREAKER TIHfiREEDRv Filed Dec. 50, 1933 6 Sheets-Sheet 6 Patented Oct. 15, 1935 UNITED STATES PATENT ()FFICE SAFETY DRIVING MECHANISM AND CUR- RENT BREAKER THEREFOR George J. Uhlig, Chicago, 111., assignor to Victor Adding Machine Company, Chicago, 111., a corporation of Delaware This invention relates to improvements in safety driving mechanism and current breaker therefor, and being more particularly adapted for controlling the connections of machines with their source of power. As for example, the device is illustrated as being attached to an adding machine for driving the same, wherein a single revolution or cycle is required for the normal operation of the setting up of the parts of the machine to make an impression thereof, and for restoring them to their normal positions during the cycle, and wherein provision is made whereby a number of successive revolutions may be had at the will of the operator.

The chief objects of the invention are the provision of unitary driven actuating mechanism for automatically rendering the driving action of the machine eifective for a complete cycle under the driving power of a motor and for cutting oil the current supply to the motor upon the completion of the cycle and the parts being automatically brought to rest in a predetermined position, being caused to move under the control of a touch-bar and also under the control of the feature keys of the adding machine.

Another object is the provision of means for cutting off the current supply to the motor when the machine is operated and the parts thereof become locked due to some cause or other or of interference in the mechanism and thereby relieving the strain on the driving parts and preventing the burning out of the motor.

A further object is the provision of means for controlling and to even out the load in the machine in each cycle of operation.

In the accompanying drawings embodying my invention, I show the device as being attached to an adding machine, but do not wish to be limited to the operation and action solely to an attachment while all of the features embodied in these improvements will be substantially the same.

Figure l is a side elevation illustrating my device as attached to an adding machine, showing the casing of the machine in cross-section and the control parts extending from the device to operate the machine.

Figure 2 is a side elevation similar to Fig. 1, illustrating the control parts in a changed position.

Figure 3 is a side elevation showing a portion of the driving unit and the planetary gearing thereon for controlling the safety switch and also the wiring circuit being shown diagrammatically therewith.

Figure 4 is an enlarged detail cross-sectional View taken on the line 4-4 of Fig. 3, showing the interior mechanism of the driving unit.

Figure 5 is a longitudinal sectional view taken on the line 5:"i of Fig. 4.

Figure 6 is an enlarged detail side elevation of the planetary gearing for operating the safety switch.

Figure 7 is an enlarged detail cross-sectional face view taken on the line 'E-l of Fig. 6.

Figure 8 is an enlarged detail side elevation 10 similar to Fig. 6, showing the other side of the planetary gearing.

Figure 9 is a. detail cross-sectional view of the contacting member taken on the line 9-9 of Fig. 7.

Figure 10 is a fragmentary detail side elevation of the lower end of the feature keys, showing their connection to control the driving mechanism.

Figure ii is an enlarged perspective detail view 20 of the feature key rocker member.

Figure 12 is a side elevation of a modified form of driving mechanism as attached to an adding machine.

Figure 13 is an enlarged detail cross-sectional 25 view taken substantially on the line I3-l3 of Figs. 12 and 1%.

Figure la is an enlarged longitudinal sectional view of the driving mechanism with parts thereof being partially in elevation.

In the preferred embodiment of the invention, the mechanism includes a housing It provided with a plurality of ears it for attaching and supporting the device in position on a plate or Wall ill which is secured to the bottom wall it of the adding machine. The housing I5 is provided with a horizontally extending portion 55a for housing a motor 59 which has its shaft 2%] journaled in a bearing 2i supported on the wall 22 positioned between the housings it and Eta. The shaft 20 of 0 the motor i9 is provided with a transverse tongue portion fitting into a transverse slot opening 2 3 milled in on end of a worm 25 for driving the same and having its other end journaled in an adjustable bearing 26 at the outer end of the housing it. The bearing 26 also serves as an endthrust bearing for taking the driving thrust of the worm 725 While it is driving the mechanism by means of a worm-wheel 21 carried in the housing E5. The worm-wheel 27 is in the form of a ring gear, being provided with a central bore 28 which is supported for turning movements with and independently of a shaft 29 by means of a collar 30 provided with a central bore 3| through which the shaft 29 extends. A disc 32 is fixed to one end 5 of the collar 30 and has the studs 33 and 34 fixed thereto with their free ends extending through openings 35 and 36 respectively in the wormwheel 21 for supporting the same on the shaft 29. Each of the studs 33 and 34 is provided with a shoulder 33!: and 34a respectively adjacent the disc 32 for spacing the worm-wheel i1 therefrom and with the shoulder 33d of one of the studs providing for the attachment of one leg 31 of a torsion spring 38 which has its body portion encircling the collar 30 and being disposed within the bore 28 of the worm-wheel 21. The other leg 39 of the torsion spring 38 is fixed to a stud 49 on a lever member 4| which is fixed for turning movements with the shaft 29 by means of a collar 42 fixed thereto with a pin 43 and has the lever member 4| secured thereto for turning movements with the shaft 29.

The studs 33 and 34 are arranged substantially diametrically opposite each other in fixed position on the disc 32 with the stud 39 relatively longe than the stud 33 to extend into the path of the lever member 4| which is normally urged against the stud 34 by means of its connection with the torsion spring 38 secured thereto.

It will be noted that a flexible drive between the worm 25 and the driven shaft will be had by means of the connection of the torsion spring therebetween, and to relieve the driving strain on the torsion spring 38, a drum 44 is secured to the worm-wheel 21 by means of a screw 45 and is driven therewith by means of the studs 33 and 34 respectively extending through openings 49 and 41 respectively in the drum ii. A band 48 extends within the drum 44 engaging its inner periphery and is provided at its free ends with inwardly disposed portions 49 and having re duced portions and 52 which form opposed shoulders and tongues between which a compression spring 53 is interposed and guided to exert an expanding pressure on the This band 48 is provided with substantially diametrically opposed cut-away portions 54 and respectively on one edge thereof to receive the ends 4| :2 and Nb of the lever member 4| therein for turning movements therewith.

As the worm-wheel 21 is being turned by means of its driving connection with the Worm 25, the drum 44 fixed thereto will frictionally drive the lever 4| by means of its connection with the band 48 which is in frictional contact with the inner periphery of the drum 44 and by means of the torsion spring 38, the shaft 29 will be yieldingly and frictionally driven with the worm-wheel 27. This constitutes the driving mechanism for the driven shaft 29 which is connected to the parts of the machine to drive the same by means of a speed control cam 55 fixed to one end of the shaft 29 outwardly of its bearing 5? in a cover plate 53 which is secured to the housing i5. The other end of the shaft 29 is provided with a reduced portion 29a that is journaled in the housing .15 and extends outwardly thereof being provided with a flattened portion 29b adjacent its free end portion to which mechanism is supported, ar-- ranged for turning movements with the driven shaft 29 as the Worm-wheel 27 is turned.

The mechanism supported outwardly of the housing IS on the reduced portion 29a of the driven shaft 29, constitutes the safety switch mechanism for cutting off the current supply to the motor l9 as the driven shaft 29 is suddenly caused to be stopped from its turning movements during the time the device is being operated. The switch mechanism comprises planetary gearing which is caused to turn with the shaft 29 and the worm-wheel 21 for retaining the switch closed in the circuit and for causing a differential movement between the driven shaft 29 and the wormwheel 2?? under the tension of the spring 38 When 5 the driven shaft is suddenly stopped during its operating movements, permitting the worm-wheel to be driven in advance of the driven shaft 29 to open the circuit.

The collar is directly connected to a gear 59 of the planetary gc ng which is carried on the extension 29d of the shaft 29 by means of a transverse slot milled into the end of the collar 30 adjacent the inner end of the housing l5. The gear ii" is provided with a tongue 5| extending from a relatively long hub 52 and extends into the slot for turning movements with the collar 39. The hub of the gear 59 provides a bearing for the reduced end portion 29a of the shaft 29 and is journaled in the bearing 93 fixed to the housing l5 with its driving connection with the collar 39 by means of its engagement with the slot 39 thereof into which its tongue 6| extends. The 59 is in meshing engagement with a gear M which in turn is in meshing engagement with the gear 3 and being carried on the studs 66 and ti respectively fixed to a plate 68 which is secured to the bench The gear 65 is in meshing engagement with a gear 89 pivotally carried on the extension 29a of the shaft 29 and is in spaced relation with the gear 59 and being also in meshing engagement with a planet gear ll"! that meshes with a similar planet gear The planet gears Til and ll are urnaled on the studs '52 and 13 respectively, caron an arm it supported for rocking movements on the reduced portion 29a of the shaft 39 the free end thereof, and are also supported other ends in a relatively small plate which is mounted for rocking movements with 4,0 the arm "hi on the reduced portion 29a of the shaft 29 adjacent the gear 59. The planet gear ii is in meshing engagement with a gear 16 fixed for turning me ements with a shaft 29 on the reduced portion 291; thereof by means of the flattened portion 29b engaging the key 11 of the by means of a lock washer 15b extending into an annular groove 150 at the extreme end of the reduced portion 2% of the shaft 29.

During the normal driving operation of the device, the shaft 29 will be driven with the wormwheel which will cause the gear i=3 keyed there to to turn with the shaft 29 and the gear 59 to be turned with the collar 33 by means of its engagement at 69-5i. The positive turning movements of the gears it? and 59 will cause the turning movements of the gears 64 and G5 and the free turning movements of the planet gears 10 and 7| which will cause an idling movement of these gears without affecting the movement of the H.

The upper portion Ma of the arm 14 carries a contacting member designated as a whole as 18 whi is insulated from the arm 14 by means of the insulation strips 19 and 99 on each side thereof and is provided with the plungers 9| and which are normally forced outwardly by means 70 of the compression spring 83 and are normally held between a guide member 94 comprising side plates and 99 of the guide member 84. The side plates :35 and are of insulation material held in spaced relation with each other by means of the sleeves 8'! through which the screws 08 extend being threaded into the housing I5 for supporting the guide member 84 in position with respect to the arm 54. The insulated side plate 85 is provided with a segmental contacting member 89 fixed on its inner face below the screw 8'! and adjacent that portion l5a of the housing I5 and being concentric with the shaft 29 to be engaged by the sprin pressed plunger 8| carried in the arm M. The insulated plate 86 is provided with a surface contact plate 9!] adapted to be constantly engaged by the plunger 82 of the contacting member i8 carried in the arm I4. The plungers 8i and 82 form the safety switch by means of their engagement with the segmental member 89 and the plate 99 which are connected in series to the motor i9 and to a contact switch 9| from a common source of supply.

As illustrated diagrammatically in Fig. 3, the wiring circuit consists of an inlet wire 92 extending to a terminal 53 fixed to the segmental contacting member 39 and through the contacting member it to the plate $6 which has a lead 94 extending to the contact switch 9i and a lead 95 from the switch ill to the motor I9 and a return wire at from the motor I9 to the common souce of supply.

The device as positioned and attached in an adding machine, has its speed control cam 56 provided with a member 9'! fixed thereto by means of the rivets and which is provided with an outwardly extending stud 99 forming a crank to which an arm I is pivotally connected and which extends forwardly and is pivoted at IBI to a main drive lever I92 fixed to an actuator shaft it? for causing a rocking movement of the main drive lever during one cycle of the speed control cam 58. Th arm 'lilil extends outwardly of the stud 99 and is provided with a stud I04 which carries a follower ass adapted to extend into the path of a stop lever its carried on a stud it? fixed to a toggle-lever Hi8 which is mounted for rocking movements on a stud I03 fixed to the plate I? of the machine. The toggle-lever also carries a pin H9 that extends through an opening it I in the stop-lever I66 and normally engages the forward edge thereof for retaining a shoulder of the stop-lever IQE normally in the path of the follower E forming a rest thereof and preventing its continuous motion. The lower end of the toggle-link N38 is provided with a. pin i it fixed thereto on which a relatively small bell-crank l 53 is mounted for rocking movements therewith and independently thereof and having its horizontally extending leg pivotally connected by means of a pin l I4 to a link I5 which is supported on the side plate I? by means of a shoulder screw H6. The connection of the bellcrank SIB and the link M5 by means of the pin 5 forms a toggle of these two members for causing the swinging movement of the toggle-lever E68 on the stud W9 which positions the stop-lever me either in or out of the path of the follower i595 carried on the arm lilll.

While the parts are in their normal positions, the stop-lever its will be forced rearwardly by the engagement of the follower i 35 therewith, so that the opening I I I therein will engage the pin lie of the toggle-lever Hi8 and will be normally urged in the other direction by means of a tension spring it? fixed to the free end of the stoplever lot and to a pin H8 fixed to the side plate IT.

The bell-crank H3 has a pin II9 fixed to its upwardly extending leg to which a relatively long link I20 is pivotally connected and extends forwardly toward the actuator shaft I03, being carried at its forward end on a pin I2I fixed to the side plate I! and extending through a slot opening I22 in the link I20. connected to a touch-bar I23 and to the feature keys designated as a whole as I24 for causing the toggle action of the bell-crank H3 and link M5 for releasing the parts for the starting movements of the device.

The feature keys I24 are operatively connected with the link I20 by means of a rocker I25 carried on a stud I26 secured to the side plate I1 and having an equalizer I21 pivotally connected to one arm I28 thereof by means of a pin I29, The equalizer I2? is supported for rocking movements on the arm I28 of the rocker I25 and has pins I30 and I3I respectively, fixed in each end thereof for engagement by the stems i240; and I24?) respectively of the feature keys guided on the pins I32 and I33 that extend through the slot openings I34 and I35 respectively of the feature keys which are normally held in raised position by means of the tension springs l36 fixed thereto and to the casing of the machine.

The touch bar I23 is provided with a stem I230, which is provided in its lower end portion with a vertical slot opening I3'I through which a pin I38 extends to guide the lower end of the stem I23a into the path of a pin I39 fixed to the upper right-hand corner of a plate I40 which is pivotally supported on the side plate IT for rocking movements with an integral arm I4I on the stud I42. The arm I4I has pivotally connected thereto a link E43 provided with a bifurcated end portion I44 that straddles a headed pin I45 fixed in the leg I25a of the rocker I25 for permitting of a free movement of the arm I43 with respect to the rocker I25. The plate I is pro- 40 vided with a stud E46 fixed thereto on which a follower E41 is pivotally mounted for engagement with an inwardly bent portion I48 of the link E28 as the plate I40 is rocked in one direction on the stud I42.

The depression of the touch bar I23 or of any one of the feature keys I24 will cause the plate I40 to rock on the stud I42 and cause a forward pull on the link E20 by means of the engagement of the follower I46 with the inturned end I48 50 cf the link and collapse the toggle, causing a, rocking movement of the toggle-lever I08, re-. moving the pin IIO thereof from engagement with the opening III in the stop-lever I06 and rendering the driving mechanism free thereof I to be propelled by means of the driving motor 9| as the contact switch I9 is closed.

The depressing of the touch-bar I23 causes the stem I23a thereof to engage the stud I39 of the plate I40 and causes a downward rocking movement of this plate I40 which carries with it the arm i4I that causes the bifurcated end I44 of the link I43 carried thereon to slide on the headed pin I4I. The sliding action of the link 5453 on the pin 45 will not effect a movement of 05 the rocker I25, but will permit the plate I40 to be rocked independently thereof.

Upon the depression of any of the feature keys the stems I24a or I241) thereof will engage the pins I30 or I3I carried on the equalizer I21 which is pivotally carried on the arm I28 of the rocker I25 by means of the pin I29. The downward movement of the equalizer I 21 will cause the arm I28 of the rocker I25 to rock downwardly therewith on the stud I26 and cause its other The link I20 is 5 leg I25a to rock rearwardly with the headed pin I thereon engaging the innermost edge of the bifurcated end of the link M3 and carry it rearwardly therewith and rock the plate I40 with the arm I4I on the stud I02. The downward rocking movement of the plate I40 causes the follower I41 thereof to engage the inwardly turned portion I48 of the link W0 and causes this link I20 to be moved forwardly to collapse the toggle and swing the toggle-lever I08 on the stud I09.

As thus far described, the mechanism is connected for driving movements with the actuator shaft I03 by means of the main drive lever I02 ed thereto and connected to the arm I00 which enends therefrom and is pivoted to the stud 99 of the driving mechanism which is arranged for single revolution upon the depression of the touch bar I23 or of the feature keys I24, and to be automatically relieved of the driving force of the motor I9 upon the completion of the cycle. To attain this end, the plate I00 is coniink i =19 pivotally connected to a stud fixed to the plate I40 and extending upwardly and rearwarclly to be guided for sliding movements on a stud I5I fixed to the side plate ll and which extends through a slot opening I92 in the link it The link I49 is provided with a slot opening I53 rearwardly of the stud ltI through which a pin I54 extends, being fixed to the free end of a control lever I59 pivoted intermediate its length for rocking movements on a stud I50, on the side plate Ill. The contact lever is provided with an insulated roller I57 pivoted on a pin I at its other end and being normally positioned adjacent one leg of the contact switch 5H and adapted to engage this leg for making contact with its other during pulling action exerted on the link I49 as the plate I40 is rocked. A contact switch lock I59 is also supported on the stud I50 adjacent the contact lever 455 and is provided with an extension I09 adapted to engage the insulated roller ill: by means of a tension spring IOI connected to the free end of the contact lever E50, and having its other end connecetd to a pin I62 fixed to the side plate I l. The contact switch lock I50 has a connecting link !53 pivotally connected thereto below the stud Hit) by means of a pin E99 and is pivotally connected intermediate its length at 505 to the upper end of a contact--lock-lever IE6 which is also supported for swinging movements on the stud I09 adjacent the toggle-lever $00. The free end of the connecting link I99 is connected to the free end of the contact-switch-lock I59 by means of a tension spring it! which exerts a tension at the free ends of these members and normally retains the extension 550 of the contactswitch-lock I59 in engagement wit the insulated roller I511. The connecting link being pivotally supported above the stud on the contactlock-lever I06 on a pin IE5, is permitted to swing therewith under the tension of the I67 as the lower end of the contact-lock-lever 530 is out of the path of the follower E05 carried on the arm I00. The tension of the spring IE! will normally urge the link 03 and the contact-switchlock I59 to be drawn together on their pivotal centers I65 and I59 respectively and also urge rocking upward movement of the lower end of the contact-lock-lever I66 on the stud I09 and position the lower end thereof into the path of rotation to be engaged by the follower I05 as the device is operated.

acted to the contact switch 9i by means of a In the operation of the device efiected by the depression of the touch-bar I23 or by the deprcssion of the feature keys I24, a pulling action will be exerted to the link I20 leading to and connected with the toggle bell-crank H3 by means of the rocking movement of the plate I40. The pull on the link I20 will cause the bell-crank I I3 and the link II5 to be collapsed (see Fig. 2), causing a rearward rocking movement of the toggle-lever I08 and rendering the stop-lever I06 free of the follower I05, permitting the mechanism to be free to be driven by the motor I9. During this time a pull is also exerted on the link I49 which causes a rocking movement of the contact-lever I55 on the stud I56 and positions the insulated roller I57 against one leg of the contact switch 91 causing it to engage its other leg forming a contact between the leads 95 and 04 and closing the circuit to the motor I9 which causes the turning movements of the worm 25 to drive the worm-wheel El and to drive the shaft 29 in a clockwise direction (see Figs. 1 and 2), and causing a rocking movement of the main drive lever I02 with the actuator shaft I03 to drive the machine.

The pull on the link I49 causes the roller I5! to be moved upwardly for closing the contact switch 9| to start the motor, and under the tension of the spring I0'l the extension I60 of the contact switch lock 559 will be caused to follow the roller and by means of its connection with the link H33 will cause this link to be moved therewith and an outward rocking movement of the contact lock lever I55 on the stud I09 with its lower end portion into the path of the follower I 09 the instant the follower has moved out of engagement therewith.

As the follower I05 is carried in a clock-wise direction during a cycle of the driving mechanism, it will again contact the lower end of the lever I50 carrying this lever downwardly for a swinging movement on the stud I09 and cause its upper end connected at I05 to the link I63 to carry the link forwardly and also carrying the contact-switch-lock I59 therewith by means of its connection I64 with the link I93. This movement of the contact-switch-lock I59 carries the extension I60 thereof away from the insulated roller 25 which caused to follow the extension I90 under the tension of the spring IOI fixed thereto and will also cause a rearward pull on the link I49 restoring the plate M9 therewith to its normal position.

The speed control cam 55 has a follower I68 in contact therewith which is carried on a stud I69 fixed to a lever I I0 pivoted at ill on the side plate I! and which is urged forwardly with the follower I98 into contacting engagement with the cam 53 by means of a relatively strong tension spring I72. The purpose of the follower I68 enacting with the cam 50 is to control or even out the load in the machine during each cycle, and to permit of a relatively easy starting of the device, and after about onethird of the cycle, the cam being provided with a rise for exerting a rearward pressure on the tension spring i'l2 for a given distance of its cycle at which time it will drop, and the tension of the spring I72 will assist the turning movements of the device for carrying the load to near the end of its cycle. At this time, the follower 909 will again be caused to move rearwardly against the tension of the spring I12 and exert a tension against the turning movements of the cam 53 to cushion the device near its limit stroke at the time the follower engages the stop-lever Hi6 and preventing an abrupt stop thereof.

The restoring action of the link its is caused by the restoring action of the link 52% which has a spring liiila fixed thereto and to the side plate IT for exerting a rearward pressure for resetting of the toggle l lt-l 65 connected thereto and positioning th toggle-lever i528 to its normal position with the pin iii thereof engaging the forward end of the opening iii in the stop-lever I66 and retaining the stop ii /6 into the path of the follower M5 to form a permanent stop against which the follower Hi5 is brought to Should some obstruction occur in the machine to suddenly stop the actuator ltd during its op-- erative movements, the worm driven by the motor it will continue to drive the worm-wheel 21 while the shaft 29 is withheld from turning movements therewith due to its connection with the actuator shaft by means of the lever Hi2 and the arm 5%. The torsion spring 38 will be increasingly wound up by means of one of its ends 3'! being connected to the worm-wheel 2'5 and its other end connected with the shaft 29. The turning movement of the worm-wheel 2'2 causes the turning movement of the gear 59 connected therewith at tit-65 to the collar 38 which carries the disc 32 that supports the worm-wheel while the gear it retained on the reduced portion 2% of the shaft 29 by means of the lzey l'l remains dormant with the shaft The turning movement of the gear 59 causes the turning movement of the gear as which is in meshing engagement therewith and which in turn is in meshing engagement with the gear causes this gear to turn therewith. The gear 55 is in meshing engagement with the gear and causes this gear 69 to exert a turning pressure on the planet gear it which is in meshing engagement with the planet gear H and which in turn is in meshing engagement with the gear l6 which at this time, is prevented from turning due to the shaft 29 being a locked position.

The turning movement of these

gears

59 and 59 with the gears 66' and 35 will cause the planet gears iii ll to turn and one of these planet gears being in meshing engagement with the dormant gear it, will cause these planet gears to walk around the gear l6 carrying with them the arm 7 which will slidingly carry the contacting member T8 in sliding contact with the segmental contacting member 89 the contact plate so. The arm i l will continue to move until the plunger iii of th contacting member f8 has moved to the right (Fig. 3) off of the segmentab contacting-member 3%] which will break the safety switch circuit between the inlet wire 92 and the lead 56 to the motor is and relieve the driving pressure of the worm 25 to the worm-wheel El and to the remaining parts which are withheld from turning movements.

As a sudden lock-up occurs to prevent the shaft with the worm-wheel 2 the stud 3-4- carncd thereby will be caused to move away from end Mb of the lever member 'll against the tension of the torsion spring and during this time, the as will be moved with the worm-wheel in advance of the band at which is retained with the shaft 219 by means of the l ver member dl. The band 53 offers a frictional resistance to turning movements of the drum at with the worm-wheel 2i and prevents the stud t l from being turned by the wormwheel 2? to strike the end i in of the lever 4! with r a sudden jolt.

A modified form is illustrated in Figures 12, 13 and 14 of the drawings, in which the mechanism for operating the actuator shaft H33 includes the drive lever i532 fixed thereto and having an arm pivoted to a cam disc 258 by means of a stud 5 a description of one will suffice for a description 15 of all. The variation being the addition of a clutching member mounted on a reduced portion 229 of the shaft 23 and the cover plate 258 being of a cup shaped formation to accommodate for the positioning of the additional mechanism with- 20 in the housing l5.

While the device is in its normal position, the link 22f! which is pivoted at 22I to the member E li? and extends therefrom and is pivoted at 222 to a depending lever 223 secured to a stud shaft 25 I 22 5 which extends through the housing l5 and has fixed to its inner end portion a stop-arm 225 adapted to be normally retained in the path of travel of a stud 226 and to abut the same. The

stud 226 extends through an arcuate slot open- 30' ing 22'3 in the member 23! and is fixed into a crescent shaped arm 2253 which is pivoted for rocking movements on the stud 23B of the member 23| which is fixed to a collar 232 and supported for turning movements on the reduced portion 229 of 35 the shaft 29. The crescent shaped arm 228 is also yieldingly connected to the member 23! by means of a tension spring 233 connecting their free ends for urging the stud 22E of the member to the forward end of the slot opening 221 of 40 he member 23 l. The crescent shaped arm 228 is provided with an inwardly turned extension adapted to normally overhang the teeth 235 a wheel while the stud 225 thereof is in aautting engagement with the stop-arm 225. 45

The wheel 236 is fixed for turning movements with the lever member 4! by means of spacing studs which also secure the wheel 236 with the arm t i.

As the link 2129 is urged forwardly by means 50 of depressing the touch-bar I23, the depending lever on the housing i5 will be caused to rock therewith, causing a downward rocking movement of the stop-arm 225 out of the path of the stud 226 and permitting the same to be drawn 55 forwardly in the slot opening 22'! under the tension of the spring 233 by means of its engagement with the crescent-shaped. arm 228 to which the stud is fixed, The rocking movement of the crescent-shaped arm causes the extension 234 60 thereof to be drawn inwardly therewith for engagement with the teeth 235 of the wheel 236. This constitutes a clutching device for the driving movements of the cam disc 256 which is connected to the member 23! by means of a sleeve 5 "3 It will be noted that the clutching mechanism carried on the sleeve 258 is also freely carried on the reduced end of the shaft 29 and is withheld from longitudinal movements within the 7 cover by means of a bearing 239.

With this clutching device as above described, it is possible to use a continuous running motor and to intermittently connect the same during its driving movements with the mechanism by means 7 .e l l of the extension 234 of the arm 228 being selectively positioned into the path of the teeth 235 upon the downward movement of the stop arm 225 effected by means of a pulling action on the link 220 upon the depressing of the touch-bar I23 at the will of the operator. Upon the release of the touch-bar, a spring 2M fixed to the link 220 and having its other end fixed to the frame I1, will cause this link 220 to be urged rearwardly swinging the depending lever 223 therewith and positioning the stop arm 225 into the path of rotation of the stud 226 carried on the arm 22B. Upon the engagement of the stud 226 with the stoparm 225, the arm 228 will be withheld from further rotating movements and the member 255i will move in advance thereof against the tension of the spring 233 until the stud 226 abuts the rearward end of the slot opening 221. This additional movement of the member 23I after the stud 226 has engaged the stop-arm 225 which is that distance permitted by the length of the slot opening 221, causes the inwardly extending portion 234 of the arm 228 to be moved out of the path of the teeth 236 on the Wheel 2535 and permitting its free movement independently of the arm 228.

As the machine is driven by means of the mechanism for driving the shaft 29 and a lock-up of the actuator shaft I03 should occur, the torsion spring 38 will be wound up as explained the preferred embodiment and a diiferential acticn of the planetary gearing will occur for effecting a swinging movement of the arm 14 to position the contacting member 18 thereof out of contact with the segmental contacting member 83 and opening the circuit to the motor I9.

After the lock-up in the machine has been removed, the arm M will be restored to its normal at-rest position against the stud 34 under the tension of the torsion spring 38 during the time the worm-wheel 21 is withheld from turning movements against the worm 25. The restoring movement of the arm 4| will cause the shaft 29 to be moved therewith and cause the differential movement of the planetary gearing which will swing the arm 14 to its normal at-rest position and carry the contact member 18 therewith to be restored into contact with the segmental contact member 89 while in sliding contact with the plate 90 and closing the circuit to the motor and rendering the device to be again actuated at the will of the operator, upon the depression of the touchbar or the feature keys for closing the circuit to the contact switch 9I which connects the motor with the source of supply.

In this modified form, the motor I9, the safety switch and the contact switch are wired in series to form a circuit with a common source of supply in the same manner as in the preferred form, as illustrated diagrammatically in Fig. 3. The contact switch I9I is adapted to be closed upon the depression of the touch-bar I23 which causes a forward pull of the link 220 against the tension of the spring MI and also causes the rocking movement of a contact-lever 255 connected thereto and being mounted for rocking movements on a pivot 255a supported on the plate I1. The contact-lever 255 carries an insulated roller 251 which is adapted to engage one leg of a contact switch I9I to cause the same to contact with its other leg for closing the circuit to the motor I9. The pulling action of the link 220 also causes a rocking movement of the arm 223 and swings the stop-arm 225 out of engagement with the stud 226 permitting the mechanism within the housprising in combine ing I5 to drive the shaft 29 by meansof the mo tor I9. The shaft 29 will be driven in a clock- Wise direction with the cam disc 256 and carry a cam portion 256a thereof (Fig. 12), out of the path of a follower 2S5 pivotally mounted at 204 5 on a rocker arm 206 which is pivotally supported on the pin 255a adjacent the contact-lever 255. The rocker arm 206 is provided with an extension 201 that overhangs the insulated roller 251 and is urged with the follower 205 thereon against 10 the periphery of the cam disc 256 by means of a tension spring 212 connected thereto and having its other end fixed to the bottom Wall 18 of the machine.

As the cam disc 256 is being rotated under the 15 driving action of the motor I9 and the cam, portion 256a thereof is moved out of the path of the follower 205, which permits the rocker-arm 205 to rock on the stud 255a under the influence of the tension spring 212 and which will cause the 20 extension 201 of the member 205 to engage the insulated roller i251 and retain the leg of the switch I9I with its other leg for holding the same closed in the circuit. The cam portion 256a of the cam disc 2% again engages the follower 205 25 upon the completion of its cycle and forces the follower arm 201 to rock on its pivot 255a against the tension of the spring 212 and permits the roller 251 to be rocked upwardly on the pivot 255a by means of its connection With the link 30 220 which is being urged rearwardly under the tension of the spring MI which permits one leg of the contact switch I9I to follow the insulated roller 251 and open the circuit in the switch I9I to the motor !9. The momentum of the driving 5 force exerted to the shaft 29 will be gradually reduced during the time that the cam portion 2555a is riding over the follower 205 under the tension of the spring 212 and will come to rest immediately thereafter. As the cam is caused 40 to rotate a little beyond the high point thereof, the follower will then retain the stud 299 on the cam disc 25% with the arm 200 pivotally connected thereto on dead center with respect to their horizontal axis and position the actuator shaft I03 45 in its at-rest position by means of the main drive lever I02 connected to the arm 200 (Fig. 12)

I contemplate as being included in these improvements all such changes, variations and departures from what is thus specifically illustrated 50 and described as fall within the scope of the appended claims.

claim:-

l. A device of the character described, comti 1, a driven shaft, an 55 vlectric motor for driv the driven shaft, resilnt driving means c ecting the motor with the driven shaft, switch in series with the motor normally closing the circuit, and planetary gearing under the control of the motor and the 30 driven it movably supporting the switch closed 1 the circuit, resilient means form- 7. itiai movement of the earing for moving the said switch to cuit when the driven shaft is withheld 5 from-(1'1. movements.

2. A device of the character described, comprising in combination, a main driven shaft, resili' including a motor for driving heft, a switch in. series with the mo- 7 clos ng the circuit, planetary gearoi oi the motor and the driven 2 switch closed in the circuit,

.. permitting of a differential planetary gearing during the 15 shaft rel in said resi .ent movement of no turning movements of the motor in advance of the driven shaft and causing the switch to open.

3. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, resilient means connecting the motor with the driven shaft, a switch in series with the motor normally closing the circuit, and planetary gearing under the control of the motor and the driven shaft for retaining the switch closed in the circuit, said resilient means permitting of a differential movement of the planetary gearing for moving the switch to open the circuit as the driven shaft is withheld from turning movements.

l. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, resilient means connecting the motor with the driven shaft, 2. switch in series with the motor normally closing the circuit, planetary gearing under the control of the motor and the driven shaft retaining the switch closed in the circuit, said resilient means forming means for permitting of a differential movement of the planetary gearing as the motor is driven in advance of the driven shaft, and frictional means between the motor and the driven shaft arranged in such manner so as to partially resist the yieldable means for turning movements therewith during the normal operations of the device.

5. A device of the character described, comprising in combination, a main driven shaft, electric motor for driving the driven shaft, resilient means connecting the motor with the driven shaft, 2. switch in series with the motor, planetary gearing under the control of the motor and the driven shaft retaining the switch closed with the circuit, said resilient means permitting the motor to turn in advance of the driven shaft as said shaft is ield causing differential movement of the planetary gearing and moving the switch to open the circuit, and frictional means between the motor and the driven shaft resisting the resilient means do 'ng the normal operations of the device.

6. A device of the character described, comprising in combination, a main driven shaft, yieldabie means including an electric motor for driving the driven shaft, frictional means between the tor athe driven shaft, a switch in the circuit with the motor, planetary gearing, said planetary gearing being under the control of the motor the driven shaft retaining the switch in the circuit, said yieldable means and frictional means betwe the motor and the shaft permitting the motor to move in advance of the driven shaft to cause a differential movement of the planetary get ring and move the switch to open the circuit as the driven shaft is withheld from turning movements.

7. A device of the character des ribed, comprising in combination, a main driven shaft, an elec ric motor for driving the driven shaft, yieldable means connecting the motor with the driven shaft, friction means coating with the yieldable means to drive the driven shaft, a switch in series with the motor, planetary gearing under the control of the motor and the driven shaft retaining the switch closed in the circuit, said yieldable and friction'means permitting of a differential movement of the planetary gearing to open the circuit when said driven shaft is withheld from turning movements.

8. A device of the character described, comprising in combination, a main driven shaft, an

electric motor for driving the driven shaft, resilient driving means including frictional means connecting the motor with the driven shaft, a switch in series with the motor normally closing the circuit, planetary gearing operatively connecting the switch with the motor and the driven shaft, said planetary .ig normally retaining the switch closed in the circuit, the said resilient driving means and frictional means permitting the motor to turn in advance of the driven shaft 10 differential movement of the planetary gearing and moving the switch to open the circuit as the driven shaft withheld and the motor is driven in advance thereof.

9. A device of the character described, comprising in combination, a main driven shaft, resilient means including a motor for driving the driven shaft, frictional means between the motor and the driven shaft coacting with the resilient'means to drive said driven shaft, a switch in series with the motor normally closing the circuit, planetary gearing cooperating with the switch the control of the motor and the driven shaft retaining the switch closed with the circuit, said resilient means and frictional means permitting the motor to turn in advance of the driven shaft as the driven shaft is withheld and causing a differential movement of the planetary gearing moving the switch therewith to open the circuit.

3. device of the character described, comprising in combination, a main driven shaft, yieldable means including a motor for driving the driven. shaft, means independent of the yieldable means forming a driving connection between the motor and the driven shaft arranged in such manner as to resist the yieldable means during the normal operations of the device, a switch in circuit w th the motor, planetary gearing, said planetary gearing under the control of the motor and the driven shaft retaining the switch closed in the circuit, said last mentioned means and yieldable means permitting of a differential movement of the planetary gearing during the turning movements of the motor in advance of the driven shaft and moving the switch to open. the circuit.

fl. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, resilient driving means connecting the motor with the driven shaft, means between the motor and the driven shaft coacting with the resilient drivmeans to drive the driven shaft, a switch in series with the motor normally closing the circult, planetary gearing operatively connecting the switch with the motor shaft and the driven shaft, said planetary gearing retaining the switch closed the circuit and said means and resilient driving means permitting the motor to turn in advance of the driven shaft for causing a differential movement of the planetary gearing for moving the switch to open the circuit as the driven shaft is withheld and the motor is driven in advance of said driven shaft.

12. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, a switch in series with the motor normally closing the circuit, and planetary gearing under the control of the motor and the driven shaft retaining the switch closed in the circuit, yieldable means including clutchine means connecting the motor with the driven shaft for causing a differential movement of the planetary gearing for 7 moving the switch to open the circuit when said driven shaft is clutched and withheld from turning movements.

13. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, resilient driving means connecting the motor with the driven shaft, clutch means coacting with said resilient driving means, said ciutch means being adapted to intermittently engage said resilient driving means, a switch in the motor circuit, planetary gearing operatively connecting the switch with the mo tor shaft and the driven shaft retaining the switch normally closed in the circuit, and manually manipulative means coacting with the clutch means engaging the same from the driving means and effecting the engagement thereof with the driven shaft and permitting of a differential movement of the planetary gearing for moving the switch to open the circuit as the driven shaft is withheld and the motor is driven in advance thereof.

14. A devise of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, resilient driving means connecting the motor with the driven shaft, clutch means coacting with said resilient driving means, said clutch means being adapted to intermittently engage said resilient driving means, a switch in the motor circuit, planetary gearing operatively connecting the switch with the motor shaft and the driven shaft retaining the switch normally closed in the circuit, manually manipulative means coacting with the clutch means for engaging and disengaging the same from the driving means the said resilient driving means permitting of a differential movement of the planetary gearing for moving the switch to open the circuit when said driven shaft is withheld from turning movements during the time said clutch means is engaged with said resilient driving means.

15. A device of the character described, comprising in combination, a driven shaft, an elec .tric motor for driving the driven shaft, resilient ment of the planetary gearing for moving the switch to open the circuit as the driven shaft is withheld during the time said clutch means is engaged with said resilient driving means.

16. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, 3. circuit for the motor including a switch normally retaining the circuit open, a switch normally closed in the circuit, the said driven shaft adapted to be permanently connected to the parts to be driven and intermittently connected with the motor, manually controlled means adapted for intermittently connecting the motor with the shaft and to close the open switch providing a driving connection between the motor and the driven shaft whereby said switch is opened in the circuit in timed relation with a revolution of the device, and planetary gearing operatively connecting the closed switch with the motor and the driven shaft. the said planetary gearing efiecting a movement of the closed switch to open the circuit when the driven shaft is withheld from turning movements while the open switch is closed in the circuit.

17. A device of the character described, comprising in combination, a main driven shaft, an electric motor including a yieldable connection for driving the driven shaft, a circuit for the motor including a switch normally closing the circuit, planetary gearing retaining the switch closed in the circuit, a contact switch in the motor circuit, the said driven shaft being adapted to be driven with the motor as the contact switch is closed in the circuit, and yieldable means coacting with the motor and the driven shaft whereby said first-mentioned switch will be moved to open the circuit during the differential movements of the planetary gearing as the motor is driven in advance of the driven shaft.

18. A device of the character described, comprising in combination, a main driven shaft, an electric motor for driving the driven shaft, yieldable means including frictional means connecting the motor to drive the driven shaft, a circuit for the motor including a manually operated contact switch normally retaining the circuit open, a switch closed in the motor circuit, planetary gearing retaining the last named switch movably closed in the circuit, said yieldable means and frictional means forming means whereby the motor may turn in advance of the driven shaft and effect a differential movement of the planetary gearing whereby said last mentioned switch is moved to open the circuit during the time said first mentioned switch is closed in the circuit.

GEORGE J. UHLIG.