US1545116A - Driving and stopping mechanism - Google Patents

Description

July 7, 1925. 1,545,116

F. ASHVVORTH DRIVING AND STOPPING MECHANISM Original Filed May l9 l92O 4 Sheets-Sheet 1 li ymz,

July 7, 1925. 1,545,116

F. ASHWORTH DRIVING AND STOPPING MECHANISM 4 Sheets-Sheet 2 Oriinal Filed May 19, 1920 MW M 2456/22 MVWLW' KL M gym 4 July 7, 1925.

F. ASHWORTH DRIVING AND STOPPING MECHANISM 4 Sheets-Sheet Original Filed May 19, 1920 July 7, 1925.

F. ASHWQRTH DRIVING AND STOPPING MECHANISM Original Filed 19, 1920 4 Sheets-Sheet 4 v P 7/ f, L

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v I $44K Patented July 7, 1925.

UNITED STATES FRED ASHWORTH, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- PATEP ZT @FFKCE.

CHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DRIVING AND STOPPING MECHANISM.

Original application filed May 19, 1920, Serial No. 382,558. Divided and this application filed June 8, 1920. Serial No. 387,346.

To aZZwhom it may concern Be it known that I, FRED AsHwon'rH, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Driving and Stopping Mechanism; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to driving and stopping mechanisms and more particularly to driving and stopping mechanisms for shoe sewing and other high speed machines.

The object of the present invention is to provide a novel and improved driving and stopping mechanism of this type which is simple and compact in construction, and eflicient in operation, and which is designed to stop the machine without undue shock or wear on its parts.

Vith this object in view the features of the present invention consist in certain constructions, arrangements, and combinations of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art.

The several features of the present invention will be clearly understood from the following description and accompanying draw ings in which Figure 1 is a side elevation of a portion of a shoe sewing machine with a driving and stopping mechanism applied thereto embodying the several features of, the invention in their preferred form; Fig. 2 18 a detail sectional view taken on the line. 22 of Fig. 1; Fig. 8 is a rear elevation of the portion of the sewing machine illustrated in Fig. 1; Fig. 4 is a sectional plan View, partly in elevation, taken on the line 4-4 of Fig. 5; Fig. 5 is a sectional view taken on the line 5-5 of Fig. 1; Fig. 6 is a sectional plan view taken on the line 66 of Fig. 1; and Fig. 7 is a vertical sectional View of the driving and stopping mechanism taken on the line 77 of Fig. 3.

The present invention is illustrated in the drawings as embodied in a lock-stitch outsoleshoe sewing machine such as that illustrated and described in applicants (lo-pending application, Serial No. 382,558, filed May 19, 1920, of which the present application is.

a division. The sewing machine is provided with a main driving shaft 2 and a driving shaft 3 which are journaled in hearings in the frame of the machine and extend longitudinally and transversely, respectively, of the machine. The driving shafts are connected to rotate. in unison during the operation of the machine by means of intermeshing spiral gears 4 and 5 secured to the shafts, respectively.

The illustrated driving and stopping mechanism comprises a high speed driving mechanism and a low speed driving mechanism, the high speed driving mechanism acting to drive the machine during the. normal operation thereof and the low speed driving mechanism being thrown in when the high speed driving mechanism is thrown out, and being constructed to act first to reduce the speed of the machine and then to drive the machine at a low speed. After the low speed driving mechanism has been in operation at least a predetermined interval, it is thrown out and devices are then rendered active to stop the shaft in a predetermined angular position.

The high speed mechanism comprises a continuously driven pulley 6 journaled on a bushing sleeve 17 which is mounted on the main driving shaft 2 and is interposed between a collar 8 formed on the shaft and a boss 10 on the frame of the machine. The low speed driving mechanism comprises a spiral gear 12 journaled on a sleeve 14 which is mounted on the'shaft 2 and held from longitudinal movement between a sleeve 16 secured to the shaft and a shoulder 18 formed on the shaft. The spiral gear 12 is held from longitudinal movement by being interposed between the sleeve 16 and a flange 20 formed 011 the rear end of the sleeve 14. The spiral gear 12 is continuously driven by the high speed pulley 6 through speed reducing mechanism. This mechanism comprises a worm 22 engaging the spiral gear 12 and carried by an inclined shaft 24 journaled in bearings on the frame. On the left hand end of the inclined shaft 24 there is secured a bevelled pinion 26 meshing with a bevel gear 28 secured to a shaft 30 jour naled in bearings in the frame. A spur gear 32 is secured to the rear end of the shaft 30 which gear meshes with a spur gear .34 seplugs being shifted forwardly to bring their forward ends into engagement with a friction surface on the rear face of a disk 92 integral with the sleeve 16 which, as hereinbefore described, is secured "to the driv ing shaft 2. The spiral gear '12 then acts through the engagement of the friction plugs 90 with the disk 92 and the clutch member 42 to reduce the speed of the shaft to its own speed. 7

After the speed of the shaft has been thus reduced to that of the low speed driving mechanism, the brake shoe 64 is released from the clutch member 42, whereupon the resistance offered by the shaft to being driven by the low speed mechanism results in the clutch member 42 being driven by the spiral gear 12 at a greater speed than the shaft which causes the screw threads 62 to act to shift the clutch member 42 out of engagement with the friction plugs 90 of the low speed mechanism. After the low speed mechanism is thus thrown out, stopping devices are rendered active to stop the shaft in a predetermined angular position.

In order to insure that the low speed driving mechanism will remain inoperation a predetermined interval at least, means is provided for preventing the bar 66 from being shifted forwardly to apply the brake shoe 64 upon releasing the treadle rod 36 until the shaft is in substantially a pre determined angular position, and forreleasing the brake shoe 64 at the completion of at least a predetermined number of degrees of rotation of the shaft after the brake shoe is applied. The means for thus controlling the operation of the brake shoe 64 comprises a vertically reciprocating carrier 94 mounted to slide in an aperture in the frame of the machine and actuated bythe engagement of a cam roll 96 mounted on its upper end with a cam groove 98 formed in the disk 92, the cam groove being formed to cause the carrier 94 to make one reciprocation during each rotation of the driving shaft. Upon releasing the treadle rod 36 the bar 66 isprevented from being shifted forwardly a sufficient distance to apply the brake until the carrier 94 is'substantially at the limit of its upward movement, by the engagement of a roll 102 mounted on the forward end of the bar 66 with the rear side of the carrier 94. As the carrier approaches the limit of its upward 'movement,the lower end of the carrier passes the roll 102 allowing the bar 66 to be shifted by the treadle spring forwardly to cause the lug thereon to engage and straighten the toggle 81 to apply the brake shoe 64. During this movement of the bar 66, the roll 102 is carried beneath the lower end of the carrier 94. As the high part of the cam groove 98 approaches the cam roll 96 the carrier 94 as it is moved downwardly engages the roll 102 to swing the bar 66 downwardly to bring an abutment screw 104 threaded through an aperture in the cross piece 68 into engagement with a tail piece 106 projecting from the lower arm of the brake shoe toggle 81, thereby breaking the toggle to release the brake shoe from the clutch member 42 to throw out the low speed driving mechanism as above described. It will be apparent that by adjusting the abutment screw 104, the time of releasing the brake shoe 64 and, consequently, the throwing out of the low speed driving mechanism may be varied.

The final stopping of the driving shaft 2 is effected after the brake shoe 64 is re leased to throw out the low speed driving mechanism by the engagement of a stop lug 108 on the disk 92 with a stop dog 110. The stop dog 110 comprises a blocl: secured to the upper end of a downwardly spring pressed plunger 112 carried by the carrier 94. The plunger 112 comprises a rod having its upper end screw threaded into an aperture in the stop dog 110 and having its lower portion extending through an aperture 114 in the carrier 94. The plunger rod is urged downwardly by means of a spring 116 coiled about the rod and interposed between a shoulder formed near the upper end of the aperture, and a head 118 formed on the lower end of the rod. During the normal operation of the machine, the stops 108- and 110 are maintained out of engagement by the carrier which during its downward movement carries the stopdog 110 down below the path of the stop lug 108. Upon the downward movement of the carrier 94 after the roll 102 is positioned beneath the carrier, the head of the plunger 118 engages the abutment roll 102 to prevent the plunger from being moved downwardly with the carrier so that the stop dog 110 is held in position to be engaged by the stop lug 108 to stop the driving shaft 2 of the machine in a predetermined angular position. The stop disk 92 is provided with a notch adjacent the for ward side of the stop lug 108, into which notch the stop dog 110 is snapped by the plunger spring 116 upon engagement of the stops, thereby locking the driving shaft from rotation in either direction.

The stop disk 92 is provided with a slight rise 119 adjacent the stop lug 108, which by engagement with the stop dog110 assists in reducing the speed of the driving shaft 2 after the low speed driving mechanism is thrown out.

Upon actuating the treadle mechanism to again start th machine, the stop dog 110 is disengaged from the stop lug 108 before the high speed driving mechanism is thrown in.

This result is accomplished during the first part of the upward movement of the treadle rod 36, the rod acting through the bell crank 38 to shift the bar 66 rearwardly to move the roll 102 thereon out of engagement with the head of the stop plunger 112,. thereby permitting the plunger spring 116 by depressing the plunger 112 to disengage the stop dog from the stop lug 108.

The machine illustrated in the drawings is adapted to be manually operated after the machine has been brought to rest by the stop mechanism, and a safety device is provided to obviate any danger of the power driving mechanism being thrown in While the machine is being thus operated. Preliminary to the manual operation of the machine, the treadle rod 36 is raised to release the positive stop dog 110 from the stop lug 108 and to allow the spring 75 to bring the forward end of the bar 66 to the raised position indicated by dotted lines in Fig. 7. This result is accomplished by raising the treadle rod sufficiently to disengage the roll 102 mounted on the bar 66 from the head of the stop plunger 112 without raising the treadle rod sufiiciently to throw in the driving mechanism. In order to prevent the power drivin-g mechanism from being thrown in while the machine is beingmanually operated, means is provided for securely locking the bar 66 in its raised position and consequently locking thetreadle rod 36 from movement. This .means comprises a locking pinmounted to slide in a bearing in the frame of the machine which pin is advanced, by mechanism hereinafter described, into engagement with an aperture, 121 in the forward end of the bar 66.

The machine is manually operated by means of a hand wheel 122 mounted to slide on a bearing sleeve 123 secured to the frame.

of the machine and in which the left end of the driving shaft 3 is journaled. During the normal operation of the'machine the hand wheel is disconnected from the driving shaft 3 and is held in position against a flange 124 formed on the inner end of the sleeve 123 by the engagement of a spring pressed ball 126 mounted in. the hub of the hand wheel with an annular groove 1.28 in the sleeve 123.. When it is desired to operate the machine manually, the hand wheel is connected to the driving shaft 3pso that upon rotating the hand wheel the main driving shaft 2 of the machine is rotated To connect the hand wheel and the driving shaft 3, the hand wheel is moved outwardly on the bearing sleeve 123 to disconnect the spring pressed 'bal'l 126 from the groove 128 and to bring a hexagonal portion 130 of the inner wall of the hub of the hand wheel into engagement with a hexagonal surface 132 'formed on a collar secured to the extreme left end of the driving shaft 3. The hand wheel is held in this position bythe engagement of the ball 126 with an annular roove .134 in the sleeve 1.13. During the outward movement of thehand wheel, the locking pin 120 is moved into engagement with the look ing aperture 121 in the bar 66 by mechanism connecting the hand wheel with the bar. This mechanism comprises a rack bar 136 mounted to slide in a bearing in the frame and having its outer end bent at right angles teen-gage an annular groove 138 in the hub of the hand wheel. This rack bar 136 is pro vided with gear teeth that are engaged by a gear segment 14.0 secured to the upper end of a vertical roe-k shaft 142 mounted in the frame. The lower end of the rock shaft 142 carries a gear segment 144 that engages gear teeth formed on a side of the locking pin 120.

hen it is desired to again throw in the power driving mechanism of the machine,

the hand wheel 122 is moved inwardly which disconnects the hand wheel from the shaft 3 and acts through the mechanism connecting the hand wheel with the locking pin 120 to disengage the locking pin from the bar 66., thereby releasing the treadle rod to permit the treadle mechanism for the power driving mechanism to be operated.

The operation of the mechanism illustrated in the drawings has been indicated in connection with the description of the construction and arrangement of the parts, but may be briefly stated as follows I As illustrated in Fig.7, the parts are in a position in which the machine is at rest. To throw in the high speed the rod 36 is raised. This forces the high speed clutch member 6 against the disk 4.2, thereby rotating the disk in a direction to cause the disk to travel along the shaft 2 towards the right. Looking from the right of Fig. towards the leitt the direction of rotation is clockwise. The movementof the disk 42 along the shart 2 is limited by the stop flange 8 on the shaft. The upward movement of the rod 36 rocks the bell crank 38 and through the link 66 pulls the roll 102 from beneath the plunger 118. The plunger is depressed by its spring and the stop 110 is removed from the notch 108 in the disk 92. hen it is desired to stop the machine the rod '36 is depressed. The depressing movement of the rod is prevented by the engagement of the roll 102 with the side of the carrier 94, as illustrated in dotted lines in Fig. 7, until the driven shaft 2 and the disk 92 secured thereto is in a certain angular position. In this angular position the carrier 94 is raised above the roll 102, thereby allowing the rod '36 to be depressed. the rod '36 moves the high speed clutch memher 6 out of engagement with the disk 42 and at the same time moves the link 66 be wards the left. The movement of the 11]! towards the left causes the cross bar '80 to engage the toggle 81 and thereby force the brake shoe 64 into engagement the disk 12. This immediately puts a drag on the This downward movement of disk 42 so that the shaft 2 rotates faster than the disk, thereby causing the disk 42 to be moved along the shaft 2 towards the left. It is to be noted at this point that so long as the brake shoe 64 remains in engagement with the disk 42 a drag is exerted upon the disk so that it tends to lag behind the shaft 2. The movement of the disk 42 to the left brings it into engagement with the friction plugs 90 in the lowspeed driving member 12 and pushes the plugs against the disk 92 which is secured to the shaft 2. The friction plugs 90 act as a brake on the disk 92 until the speed of the disk is reduced to that of the low speed clutch member 12. After the speed is reduced to this point, the disk 92 on the shaft 2 is driven by the member 12 of the low speed clutch and continues to be so driven because the brake shoe 64 continues to exert a drag on the disk 42. The shaft 2 continues to be rotated at the same speed as the low speed clutch member until the carrier 94 is depressed to force down the link 66 and thereby break the toggle 81 and remove the brake shoe 64 from the disk 42.

.As this occurs the rise 119 on the disk 92 engages the stop dog 110 and thereby a braking action is exerted upon the disk 92 which retards the rotation of the shaft 2 so that it rotates slower than the member 12 of the low speed clutch. The low speed clutch .therefore acts to continue the rotation of the are not limited to use in any particular type of machine.

The nature and scope of the present in vention having been indicated and a machine embodying the several features of the invention in their preferred form having been specifically described, what is claimed is g I 1. A driving mechanism having, in com bination, a shaft, a high speed driving clutch member, a low speed driving clutch member, a driven clutch member mounted outhe shaft adapted to, cooperate with the driving clutch mombersand capable of rotary movement relatively to the shaft, and means to. shift the high speed driving clutch member into engagement with the driven clutch member constructed and arranged to cooperate with the driven clutch member to connect the high speed driving clutch mem- It is also to be understood ber and the shaft, and upon disengagement of the driven clutch member and the high speed driving clutch member to automatically shift the driven clutch member into enga'gement with the low speed driving clutch member to connect the low speed driving clutch member and shaft.

2. A driving mechanism having, in combination, a shaft, a driven clutch member mounted on the shaft and capable of rotary movement with relation to the shaft, a driving clutch member mounted for rotation about the shaft, and means for shifting the driven clutch member into enga ement with the driving clutch member, and for thereafter clutching the driven clutch member to the shaft.

3. A driving mechanism having, in combination, a shaft, a driven clutch member mounted on the shaft, a friction disk secured to the shaft, a driving clutch member mounted on the shaft having a series of apertures and interposed between the driven clutch member and the friction disk, friction plugs mounted to slide in said apertures having friction surfaces formed on their ends which are adapted to operatively engage jfriction surfaces on the driven clutch member and the friction disk, and means for shifting the driven clutch member into engagement with the friction plugs to connect the driving clutch member and shaft.

4. A driving and stopping mechanism having, in combination, a shaft, a high speed driving mechanism therefor, a braking device for reducing the speed of the shaft after the high speed mechanism and shaft are disconnected, a low speed driving mechanism for the shaft constructed to act shifting from the high to the low speed driving mechanism and for thereafter disconnecting the shaft from the braking device and lowispeed mechanism.

' 5. A driving and stopping mechanism having, in combination, a shaft, a high speed driving mechanism therefor, a 10W speed driving mechanism therefor constructed to act first to reduce the speed of the shaft and then to drive the shaft at a low speed, and means constructed andarranged for shifting from the high to the low speed driving mechanism and upon the low speed mechanism acting to drive the shaft for reducing the speed of the shaft below that of the low speed driving mechanism to disconnect the low speed driving mechanism and shaft.

6. A driving and stopping mechanism having, in combination, a shaft, a high speed driving mechanism therefor, a low speed driving mechanism therefor constructed to act first to reduce the speed of the shaft and then to drive the shaft at a low speed, means constructed and arranged for shifting from the high to the low speed driving mechanism and upon the low speed mechanism acting to drive the shaft for reducing the speed of the shaft below that of the low speed driving mechanism to disconnect the low speed driving mechanism and shaft, and means for I angular position. v.

7. A driving mechanism having, incombination, a driving clutch member, a shaft, a driven clutch member-screw threaded on then stopping'the shaft in a predetermined the shaft and capable of a limited rotary movement with relation to the shaft whereby the screw threads act to shift theclutch member longitudinally of the shaft, a stop for limiting the longitudinal movement of the driven clutch member in one direction, means for shifting the driving clutch member into engagement with thedriven clutch member whereby the driven clutch member tends to be turned in the direction to force it against said stop to establish driving connection between the shaft and driving clutch memberr 8'. A driving mechanism having, in combi-V nation, a shaft, a driven clutch member screw threaded on the shaft and capable of a limited rotary movement with relation to the shaft whereby the screw threads act to shift the clutch member longitudinally of the shaft, 21 high speed driving clutch member mounted for rotation about the shaft and'located at one side of the driven clutch member, a low speed driving clutch member vmounted for rotationabout the shaft and located at the opposite side of the driven clutch member, means for shifting the high speed driving clutch member into and out of engagement .with the driven clutch member, means forrreducing the speed of rotation of the driven clutchmember below that of the shaft when the high speed driving clutch member and shaft are disconnected, said screw threads constructed to shift the driven clutch member toward the high speed clutch member when these clutch members are in engagement, and to shift the driven clutch member into engagement with the low speed driving clutch member as the speed of rotation ofthedriveuclutch member is reduced below that of the shaft.

9. A driving and stopping mechanism having, in combination, a shaft, a driving mechanism therefor, means for connecting and disconnecting the" driving mechanism and shaft, and means for stopping the shaft in a predeterminedangular position upon the shaft and driving mechanism becoming disconnected comprising a braking. device for the shaft, a disk carried by the shaft, a stop-lug carried by the disk, a cooperating stop dog, and means comprising a cam formed on the disk for maintaining said ating stop dog out of engagement with the stop lug while the shaft and driving mechanism are connected, and after the driving mechanism: and shaft are disconnected for releasing the braking device and for 08ition-ing said stop dog into the path 0 the stoplug.

10 A driving and stopping mechanism having, in combination, a shaft, high and low speed. driving members therefor, means Vforthrowing the high speed member into and out of operation, means for throwing the low speed member into and out'of eperatien comprising a clutch actuating member screw threaded on the shaft and operating when rotated with relation to the shaft in opposite directions to throw the low speed member into and out of operation, a brake to retard the rotation of the actuatingmem- ;ber, a stop'disk, a stop dog, timing mechanism to release said brake and applythe stop dog, comprising a timing cam and connections under the control of theoper- 'ator arranged to insure a substantial amount of low speed drive. 7

11. A] driving and stopping mechanism having, in combination, a shaft, high and low speed driving members therefor, means for throwing the high speed member into and out of operation, and means for throw- *and out of operation, means for throwing the low speed member into and out of operation comprising a clutch actuating member screw threaded on the shaft and operlting when rotated at a less speed than the shaft to throw the low speed member into operation, and when rotated at a greater speed" than the shaft, tothrow the low speed member out of operation, and means for reducing the speed of the actuating member below that of the shaft when the high speed member is thrown out.

'13. A. driving and stopping mechanism having, in combination, a shaft, high and low speed driving members therefor, means for throwing the high speed member into and out of operation, means for throwing the low speed member into and out of operation comprising a clutch actuating member screw threaded on the shaft and oper- 7 when rotated at a less speed than the shaft to throw the low speed member into operation, and when rotated at a greater speed than the shaft to throw the low speed member out of operation, and means for reducing the speed of the actuating member below that of the shaft when the high speed member is thrown out, and for reducing the speed of the shaft below that of the actuating member after the low speed member has been thrown in at least a predetermined interval.

14. A driving and stopping mechanism having, in combination, a shaft, high and low speed driving members therefor, means for throwing the high speed member into and out of operation, means for throwing the low speed member into and out of oper ation comprising a clutch actuating member screw threaded on the shaft and operating when rotated at a less speed than the shaft to throw the low speed member into operation, and when rotated at a greater speed than the shaft to throw the low speed member out of operation, means for reducing the speed of the actuating member below that of the shaft when the high speed member is thrown out, and means for stopping the shaft in a predetermined angular position after the low speed mechanism is thrown out.

15. A driving and stopping mechanism having, in combination, a shaft, a driving mechanism therefor, means for throwing the driving mechanism into and out of operation, comprising a clutch actuating member screw threaded on the shaft and operating when rotated with relation to the shaft in opposite directions to throw the driving mechanism into and out of operation, and means cooperating with the actuating member to insure that the driving mechanism will b thrown in a predetermined interval at least.

16. A driving and stopping mechanism having, in combination, a shaft, a driving mechanism therefor, means for throwing the driving mechanism into and out of operation, and means for reducing the speed of the shaft after the driving mechanism is thrown out, and for stopping the shaft in a predetermined angular position comprising a stop disk, a cam, a carrier reciprocated by the cam, a spring actuated stop dog mounted on the carrier, and a movable abutment for effecting operative engagement of the stop dog with the stop disk during movement of the carrier in one direction to stop the shaft in a predetermined angular position.

17. A driving and stopping mechanism having, in combination, a shaft, a driving mechanism therefor, treadle operable means for connecting the shaft and driving mechanism, means for disconnecting the shaft and driving mechanism, and for maintaining the shaft and driving mechanism disconnected in such a manner as to permit an independent rotation of the shaft, means for preventing the treadle operable means from being operated to connect the shaft and driving mechanism while the shaft and driving mechanism are thus disconnected.

18. A driving and stopping mechanism having,'in combination, a shaft, high and low speed driving mechanisms therefor, treadle operable means for connecting the shaft and the high speed driving mechanism, means for shifting from the high to the low speed driving mechanism, for disconnecting the shaft and low speed driving mechanism, and for maintaining the shaft and low speed driving mechanism disconnected in such a manner as to permit an independent rotation of the shaft, and means for preventing the treadle operable means from being operated to connect the shaft and high speed driving mechanism while the shaft and low speed driving mechanism are thus disconnected.

19. A driving and stopping mechanism having, in combination, a shaft, a driving mechanism therefor, treadle operable means for connecting the shaft and driving mechanism, means for disconnecting the shaft and driving mechanism, and for maintain ing the shaft and driving mechanism disconnected while permitting independent rotation of the shaft, a manually operable wheel for rotating the shaft normally disconnected therefrom and capable of being n'icved longitudinally thereof, means for locking said wheel to the shaft when the wheel is moved to a definite position relatively to the shaft, and connections between said wheel and treadle operable means for locking the treadle operable means from being operated to connect the shaft and driving mechanism while the wheel is locked to the shaft.

20. A driving and stopping mechanism, having, in combination, a shaft, a manually operable wheel normally disconnected from the shaft, a power driving mechanism for the shaft, and means to simultaneously lock the power driving mechanism out of operation and for connecting the shaft and manually operable wheel to permit the wheel to be operated to rotate the shaft independently of the driving mechanism.

21. A driving and stopping mechanism having, in combination, a shaft, high and low speed driving mechanisms therefor, means for shifting from the high to the low speed driving mechanism, a manually operable wheel normally disconnected from the shaft, and means for connecting the wheel and shaft.- and for maintaining the low speed driving mechanism andshaft disconnected to permit the shaft to be rotated independently of the low speed driving mechanism.

FRED ASI-UVORTH.

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