US2272553A - Driving and stopping mechanism - Google Patents

Description

Feb. 10, 1942. FQSSA DRIVING AND STOPPING MECHANISM Original Filed July 1, 1938 5 Sheets-Sheetl Feb. 10, 19425. oss

DRIVING AND STOPPING MECHANISM 5 Sheets-Sheet 2 Original Filed July 1, 1938 Feb. 10, 1942. J. FOSSA DRIVING AND STOPPING MECHANISM Original Filed July 1, 1938 5 Sheets-Sheet 3 Feb. 10, 1942. J. FossA DRIVING AND STOPPING MECHANISM 5 Sheets-Sheet 4 Original' Filed July 1. 1938 jvenion Feb. 10, 1942. J. FossA 2,272,553

DRIVING AND-STOPPING MECHANISM Original Filed July 1, 1938 5 Sheets-Sheet 5 Patented Feb. 10, 1942 1 STATES PATENT OFFICE Shoe Machinery Corporation,

Borough of Flemington, N. J., a corporation of New Jersey Original application July 1, 1938, Serial No. 217,003. Divided and this application May 10, 1940, Serial No. 334,398

17 Claims.

The present invention relates to improvements in driving and stopping mechanisms, particularly adapted for use in controlling the operations of shoe upper lacing machines, and is hereinafter illustrated as embodied in a shoe upper lacing machine similar in many respects to that disclosed in U. S. Letters Patent of the present inventor No. 2,106,320 of January 25, 1938.

The object of the invention is to provide novel and improved driving and stopping mechanisms for a shoe upper lacing machine which will be capable of being controlled more easily and accurately than heretofore.

With the above object in view, the invention contemplates the provision of novel and improved constructions for the driving and stopping mechanisms which will render the lacing mechanism of a shoe upper lacing machine more accurate in operation and more easily controlled and which will render the driving and stopping mechanisms more durable in continued use than in previous lacing machines.

The several features of the invention and the advantages to be obtained thereby will be readily understood by one skilled in the art from the following description taken in connection with the accompanying drawings in which Figure 1 is a view in left-hand side elevation of a lacing machine embodying the features of the present invention; Figure 2 is a view in elevation looking from the right, partly in section, of a portion of the machine illustrating certain parts of the driving and stopping mechanisms shown in stopped positions; Figure 3 is a detail view, partly in section, of the same parts of the driving and stopping mechanism shown in starting positions; Figure 4 is a similar view of the same parts illustrating the positions assumed subsequently to those shown in Figure 3; and Figure 5 is a sectional view of a portion of the driving and stopping mechanism taken along the line 55 of Figure 2.

The lacing machine illustrated in the drawings forms the subject-matter of applicants pending application Serial No. 217,003, filed July 1, 1938, of which the present application is a division. The illustrated machine is similar except as hereinafter described, to that of inventors prior patent above identified. It is provided with a row of parallel eye-pointed needles 2 on which oppositely disposed alined eyelets in the quarter portions of a folded shoe upper are impaled by the operator before each lacing operation. When the machine is started, the upper is gripped in its folded condition and held in the machine until the lacing is completed. The machine is provided with a series of individual clamping members 4 and 6, two for each lacing needle, and with upper and lower clamping jaws 8 and I0, the

upper one of which carries a horizontally projecting rod I2 extending in front of all the needles. The machine is operated by a main driven shaft I4 rotating in bearings in the main frame I6 of the machine, and carrying at its right end a driving pulley I8 rotatable thereon (see Fig. 5). The driving pulley I 8 comprises the driving member of a driving and stopping mechanism, and is connected with the main shaft by depressing a treadle connected rod 20, best shown in Fig. 2, which provides a manual control for the driving and stopping mechanism to be hereinafter described.

The driving and stopping mechanism for the machine of inventors prior patent is provided with a control arm which is actuated in part by the treadle rod and in part by power operated mechanism to start the machine in operation. This control arm is similar to the arm 86 of the present machine, as illustrated in Figures 2, 3, 4 and 5. The control arm 86 is connected to the treadle actuated rod 20 by a hook member I pivotally mounted at the upper end of the treadle rod, having its hooked portion engaged with a roll I52 rotatable on the pivot 90 on the control arm 86. The control arm 86 is fulcrumed on the end of a shaft I56 secured in the machine frame, and at its opposite free end is arranged to engage the upper end of a set screw I58 threaded into a block I60 clamped to a vertically slidable clutch controlling rod I62. The rod I62 passes through hearings in a bracket I64 and is urged to a raisedposition by a coil spring I66 surrounding the rod between the lowermost bearing of the bracket I 64 and the block I 60. When the rod I62 is forced downwardly, the driving pulley I8 is connected to the main driven shaft I4 of the machine. While the machine is at rest, the control arm is held raised some distance above the screw I58, as illustrated in Figure 2.

To relieve the operator of the necessity for overcoming the force of the spring I66, as well as the resistance offered by other portions of the driving and stopping mechanism, which are actuated by the control arm 86, the control arm has a stud screw I68 threaded therein on which is mounted a cam lever I10 having a roll I12 arranged to engage a cam I14 rotating with the main driving pulley I8. To hold the cam roll I12 against the surface of cam I74, a tension spring I76 is stretched between a pin on the lever I16 and a pin on the control arm 86. The end of the cam lever I76 opposite the roll I72 cooperates with a latch member I78 pivotally mounted at its lower end on a screw I86 secured in the control arm 86. The latch member I78 is normally urged towards the cam lever by a spring I8I stretched between the arm 86 and the latch memher, but is held from engaging the cam lever while the machine is stopped. The arrangement is such that when the treadle rod 26 is depressed, the free end of the control arm 86 is lowered nearly to the point of engaging the cam lever I76 and the cam lever which is being continuously oscillated by the cam I74 is latched to the arm 86 so that further movement of the cam lever by the cam will cause the control arm 86 to be forced downwardly against the screw I58, the control rod I62 to be depressed against the spring I66, and other operations incidental to starting the machine performed. It will be noted that the only effort required by the operator when depressing the treadle rod is to bring the control member idly to a lower position from that shown in Figure 2. Thereafter, the machine is started by power derived from the main driving pulley I8.

When the control arm 86 is forced downwardly against the screw I68 sufiiciently to operate the control rod I62, it is held for siX rotations of the shaft I4 and thereafter the control arm is allowed to rise and the machine brought to rest. To hold the control arm in lowered position while the machine is operating, there is provided a shaft I82 geared to be driven from the shaft I4, one revolution for each six revolutions of the shaft I4. At the right end of the shaft I82 there is secured a one-revolution stop cam I84 having a recessed portion arranged to receive the roll I52 on the control arm 86 when the control arm is in raised position. When the control arm is moved to cause the machine to start its operation, a lever I86 rotatably mounted at the end of the shaft I 82 moves above the roll I52 in its lowered position and prevents it from again rising until the cam I84 has moved its outermost surface into engagement with the roll. The stop cam I84 then holds the control arm lowered until the recessed portion of the cam is r I86 and the stop cam. The driving and stopping the present machine is held from oscillation while the machine is not operated.

To hold the lever I76 from oscillation between the times in which the present machine is operated, the lever I76 has pivotally connected at 268 the upper end of a restraining link 2I6, the lower end of which is loosely supported on a screw 2I2 threaded into the center of a shaft 2E4 mounted in hearings in the machine frame mechanism thus far described is substantially the same in construction and manner of operation as in the machine of inventors patent above identified. However, in the machine of the patent. the control arm is raised from the set screw I58 by a spring coiled about the hub of the arm and in the present machine, the control arm is held raised by a spring-pressed rod I89 pivotally connected to the control arm.

In inventors patented machine, so long as the main driving pulley I6 is being rotated, the cam lever I76 oscillates continuously on the stud screw I68, thus causing constant vibration and wear, even while the machine is idle. When the roll I72 and cam I75 or the fulcrum for the lever I76 become slightly worn, undesirable noise or improper adjustment of the parts may result. To avoid frequent adjustments in attempting to overcome these diiiiculties, the cam lever I76 in so that the screw 2I2 is held stationary. The lower end of the restraining link 2I6 is formed with a slot 2I6 of sufficient length to accommodate the entire movement imparted to the cam lever I76 by the cam I74. When the treadle rod 26 is depressed, the fulcrum screw I66 of the lever I76 is moved downwardly with the control arm 86 on which it is mounted, and the cam roll I72 moves from the position shown in Figure 2 to that illustrated in Figure 3. The resulting movement of the cam lever I76 causes the distance between the pivot 268 of the link 2I6 and the screw 2I2 to be so shortened that the end of the slot 2I6 no longer holds the cam roll I72 away from the cam I74. At the same time that the control arm is moved downwardly, the latch member I78 engages the cam lever I76 so that the cam lever is latched to the control arm 86 and, as the cam I74 rotates, the control arm will be actuated in the desired manner.

In the prior machine, the latch member I78 is not moved away from the cam lever until just before the machine stops, so that the cam lever rubs against the latch member during operation of the machine. In the present machine, the

' latch member is provided with a rearwardly projecting pin 2 I8 arranged in the path of the lever I86 and of a flanged rim formed on the cam I84. The rim on the stop cam I84 extends throughout the greater part of the circumference of the cam so that the time during which the end of the cam lever may rub against the latch I78 is greatly reduced.

The controlling rod which is lowered by the operation of the control member in the prior machine operates directly in a cam slot formed in a sleeve or hub portion of a driven clutch member rotating with the main driving shaft. When the controlling rod is raised, the pulley which forms the driving member of the clutch is disconnected from the main shaft and a brake is applied to stop the machine. In the present machine, the upper end of the controlling rod I62 does not directly engage a cam slot, but acts only to stop the oscillation of an arm 226 which is oscillated about a vertical pin 222 by a cam slot in a clutch sleeve 224 (see Fig. 5) during operation of the machine. The lower end of the pin 222 is secured in an arm of the bracket I64. The arm 226 at its free end is provided with a cam-slot engaging roll 22B and is formed with a downwardly extending shoulder having a replaceable wear plate 228 along which the upper cut-away end of the controlling rod I62 slides to lock the oscillating arm 226 from movement. The roll 226 in the illustrated machine cooperates with a cam slot formed in the sleeve 224 which is keyed to, but slidable lengthwise of the main shaft I4. The hub of the driving pulley I8 has a bearing on the outer surface 86 of the sleeve 224, but is held from movement along the shaft I4 with the sleeve by a collar 232 secured to the driving pulley I8 and arranged to ride in a groove between a shouldered bushing 234 and a nut 236 secured to the end of the shaft I4. Extending radially from the sleeve 224 of the clutch sleeve is a flange, one surface of which may be pressed against a layer of friction material 238 secured within an under-cut radial part of the driving pulley l8 and to prevent the entrance of foreign substances between the engaging surfaces of the flange on the sleeve and the friction material 238, the space within the under-cut portion of the driving pulley is enclosed by a circular plate 220 having a central opening and forming a support for the cam surface H4. When the controlling rod I62 is withdrawn from the wear plate 228 on the arm 222, the flange of the sleeve 224 is forced by a spring 242 against the friction material 238 to clutch the driving shaft M to the driving pulley. The spring 242 is coiled around the shaft M with an enlarged opening in the sleeve 224 and acts against a shoulder formed at the end of the opening in the clutch sleeve 224 at one end and at the other end against a similar shoulder formed 'in an opening within the hub of a brake drum 244 secured to the shaft. When the controlling rod locks the arm 220 in position, the spring 242 is compressed and the pressure of the flange on the sleeve 224 against the friction material 238 is relieved. A brake band 245 is then tightened against the brake drum 2% to bring the driving shaft M to rest at a predetermined angular position.

The brake band of inventors prior machine is actuated directly by an enlargement on a cam surface of the sleeve which corresponds in the present machine with the-sleeve 224. Due to the weight of the parts, and the speed at which the machine operates, it has been found difficult to so adjust the brake that the driving shaft will be brought to rest by this arrangement accurately and uniformly at the desired position.

The driving and stopping mechanism in which the braking means comprising a feature of the present invention is embodied is arranged to be operated in part by the one-revolution stop cam I84 when the main driving pulley I8 is disconnected from the driving shaft to cause a preliminary light yielding braking effort, first to be exerted and then at a predetermined point in the rotation of the main shaft a positive braking effort of increasing force to be exerted to bring the shaft M quickly to rest. Secured to the rear surface of the stop cam I84, as illustrated in Figures 2 and 3, is a plate 243 having a projection for causing the brake band 246 to be tightened with a preliminary yielding tension before the main shaft 94 of the machine has reached its stopping position. mounted on the one-revolution shaft I82 and secured adjustably in a suitable angular relation with the stop cam by a cap screw 25!] passing through a slot in the stop cam and into a threaded opening in the plate 242. Cooperating with the projection on the plate 248 is a three-pointed follower 252 rotatably mounted on a bolt 254 passing through one arm of a braking lever 256 which, in turn, is fulcrumed on a shaft 258 secured in the frame of the machine. The follower 252 is so arranged that during normal rotation of the stop cam, one point is held in the path of the projection on the plate 248 and another point of the follower is held against a lug 280 on the lever 25% by the movement of the plate along the surface of the follower. The projection on the plate 248 is formed with a gradual incline on one side and a shoulder on the other, so that the follower will drop quickly on at the end of the preliminary braking opera- The plate 248 is rotatably tion. If the machine should be reversely rotated manually or otherwise, the shoulder on the plate 248 may strike the point of the follower 252 and rotate the follower on the bolt 254 without actuating the braking lever 256. Breakage or jamming of the parts is thus avoided. The third point of the follower 252 is for the purpose of preventing movement of the follower about its pivot bolt 252 to a position where it will be out of the path of the projection on the plate 248. To this end, it is arranged when rotated to strike the plate 260. To return the braking lever to its inoperative position and to hold the follower against the plate 248, there is a spring 262 connected between the lever and a pin on the frame of the machine, and the movement of the brake lever by the spring is limited by engagement of a set screw 234 on the lever with a block 265 also secured to the machine frame.

To cause thebrake to be yieldingly applied when the braking lever 256 is actuated by the plate 248, the lever 256 has at the end of its rearwardly projecting arm a boss having a threaded opening 268 in which is slidably mounted a spring pressed pin 210. The spring pressure of the pin 210 is arranged to be suitably adjust ed by rotating a sleeve 2'52 threaded in the opening 2638 through which the pin 270 passes.

The lower end of the pin 21!! is located above one arm of a brake band actuating bell crank 214 fulcrumed on a'pin 216 secured in a stationary forked arm 218, one end of which is mounted on the shaft 258. To hold the arm 218 stationary, there is a headed rod 28!) passing through the forked portions of the arm 218, and a threaded link 232 pivoted at its lower end at 283 on the machine frame passes through an opening in the head of rod 280 and has nuts on its threaded upper end by means of which the arm is adjustably secured in place. When the braking lever 256 is rocked to cause the pin 21!] to engage the brake supporting bell crank 274, one end of the brake band 245 which is pivotally connected to the bell crank 214 is yieldingly tightened against the brake drum 244, the other end of the brake band being connected with the arm 2'58. To

provide means for adjusting the brake band, the

said other end of the band is made fast to a slotted bar 284 surrounding the rod 220 between the forked portions of the arm 273, and a set screw 285 in the bar 284 bears against the rod'to give a tighter or looser adjustment. As soon as the projection on the plate 248 allows the follower 252 on the braking lever 256 to drop off the shoulder on the plate, the yielding application of the brake is terminated and the brake is thereafter applied with a positive increasing effort until the main shaft M stops.

To apply the brake positively with increasing force, just as the main shaft l4 reaches its stopping position, the brake band actuating bell crank 21 has pivotally mounted at the lower end of its brake band supporting arm, a pawl 2.86 cooperating with an abutment 2538 projecting from the hub of the brake drum 224 (see Fig. 5)} The pawl 286 is fixed to one end of a pin 298 rotatable in a projecting bearing on the bell crank 2M and the other end of the pin has secured to it a collar 222. To hold the pawl yieldingly in the path of the abutment 238, the bearing for the pin Zilil is surrounded by a coil spring 293, one end of which is secured in the arm of bell crank 2M and the other end secured to the collar 292.

While the machine is running, the pawl is held out of the path of the abutment 288. Pivotally mounted on an arm connected with the pawl 286 is a perforated block 294 through which the upper end of a link 2% slides. The lower end of the link 2596 is pivotally connected to the control arm 86. When the control arm 86 is drawn downwardly by the treadle rod 20, the link 2516 moves idly through the block 294 until the end of the arm 86 engages the set screw B58. When the cam lever I10 is latched to the control arm, the block 284 is engaged by one of a pair of lock nuts Z98 threaded at the upper end of the rod 296 which causes rotation of the pawl 288 in a direction to withdraw it from the path of the abutment 283. This occurs at the same time that the controlling rod I62 is lowered so that the brake band 246 is released from the brake drum 246 before the driving pulley i8 is clutched to the shaft I 3. To hold the brake band yield ingly away from the drum when the pawl is disengaged from the abutment 288, there is provided a third arm on the bell crank 21 between which and a lug on the arm 218 there is stretched a spring 300. While the machine is running, the

bell crank 274 is held from further yielding movement by the engagement of opposing surfaces 332 on one arm of the bell crank and on the arm 218, respectively, as shown in Figure 4.

The nature and scope of the invention having been indicated, what is claimed is:

l. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control. member, a cam on the driving member,

2. A driving and stopping mechanism having, i

in combination, a shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, connections between the control member and clutch for causing the clutch to connect and disconnect the driving member and shaft, a single revolution stop cam driven by the shaft and engaged by the clutch control member, a cam on the driving member, mechanism including a member engaging the cam on the driving member for actuating the clutch controlling member to cause the clutch to connect the driving member and shaft, treadle. operated connections for rendering said mechanism operative, and means for holding the cam engaging member away from the cam while the control member is in a position to cause the clutch to disconnect the driving member and shaft.

3. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a cam on the driving member, a cam lever mounted on the control member, treadle controlled means for connecting the cam lever and control member to cause an actuation of the clutch by the cam and control member to connect the driving member and shaft, and means engaging the cam lever to hold the lever away from the cam while the control member is in a position to cause the clutch to disconnect the driving member and shaft.

l. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and the shaft, a movable clutch control member, a cam on the driving member, a cam lever mounted on the control member, a latch to connect the control member and cam lever to cause the clutch to connect the driving member and shaft, means for holding the latch in a position free of the cam lever when the machine is not in operation, treadle operated connections for causing the latch to connect the control member and cam lever, and means for holding the cam lever away from the cam while the control member is in a position to cause the clutch to disconnect the driving member and shaft.

5. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a cam on the driving member, a cam lever mounted on the control member, a latch to connect the control member and cam lever to cause the clutch to connect the driving member and shaft, means for holding the latch in a position free of the cam lever when the machine is not in operation, treadle operated connections for causing the latch to connect the control member and cam lever, a restraining link between the cam lever and a stationary part of the machine for holding the cam lever away from the cam while the control lever is in a position to cause the clutch to disconnect the driving member and shaft.

6. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a cam on the driving member, a cam lever mounted on the control member, a latch to connect the control member and cam lever to cause the clutch to connect the driving member and shaft, means for holding the latch in a position free of the cam lever when the machine is not in operation, treadle operated connections for causing the latch to connect the control member and cam lever, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving mernher is connected with the main shaft, and means for holding the cam lever away from the cam while the control member is in a position in which the driving member is disconnected from the main shaft.

7. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a cam on the driving member, a cam lever mounted on the control member, a latch to connect the control member and cam lever to cause the clutch to connect the driving member and shaft, means for holding the latch in a position free of the cam lever when the machine is not in operation, treadle operated connections for causing the latch to connect the control member and cam lever, a stop cam arranged to rotate a. single revolution for a number of revolutions of the main shaft and to move the latch away from the cam lever after the driving member is connected with the shaft, and

a restraining link connected between the cam lever and a stationary part of the machine for holding the cam leveraway from the cam when the control member is in a position in which'the driving member is disconnected from the main shaft.

8. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member'and shaft, a movable clutch control member, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, braking means for bringing the shaft to rest, and. means actuated by the stop cam for causing the braking means to be operated first yieldingly and then at a predetermined point in the rotation of the main shaft with a positive movement.

9. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, means for bringing the shaft to rest including a brake, and means actuated by the stop cam for operating the brake.

10. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, braking means for bringing the shaft to rest, and means actuated by the stop cam for applying the braking means with a preliminary pressure to slow down the shaft and cause the braking means subsequently to be applied at a predetermined point in the rotation of the shaft with an increased pressure.

11. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a stop cam rotating 3, single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, braking means for bringing the shaft to rest, a cam follower actuated by the stop cam for operating the braking means with a preliminary pressure, and other means under the control of the stop cam for causing the brake to be applied at a predetermined point in the rotation of the main shaft with an increasing pressure.

12. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, braking means for bringing the shaft to rest, means under the control of the stop cam for causing the brake to be applied at a predetermined point in the rotation of the main shaft with an increasing pressure, treadle operated connections, and means actuated by the driving member and controlled by said treadle connections for rendering the braking means ineffective.

13. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member andshaft, a movable clutch control member, a stop cam rotating a single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft, braking means for bringing the shaft to rest, an abutment on the main shaft, a pawl connected with the brake and arranged for movement towards and from the path of the abutment to cause actuation of th brake when engaged by the abutment, treadle operated connections, power driven mechanism rendered operative when the treadle connections are operated for moving the control member to a position in which the driving member is connected with the main shaft, and a connecting link between the control memher and said pawl to withdraw the pawl from the abutment on the main shaft when the control member is moved by the power driven mechanism.

14. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, actuating means for the clutch control member comprising treadle connections arranged to move the control member idly and power driven mechanism for moving the control member further in the same direction as moved idly by the treadle connections to cause the driving member to be connected to the main shaft, braking means for bringing the main shaft to rest, a pawl actuated by the main shaft for rendering the braking means effective, and connections between the control member and pawl for rendering the braking means ineffective when the control member is actuated by the power driven mechanism.

15. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, actuating means for the clutch control member comprising treadle connections ar-' ranged to move the control member idly and power driven mechanism for moving the control member further in the same direction as moved idly by the treadle connections to cause the driving member to be connected to the main shaft, a brake drum on the mainshaft, a brake band surrounding the drum, an abutment rotating with the main shaft, a pawl actuated by said abutment for tightening the band about the brake drum, and a link connecting the control member and pawl for moving the pawl away from the abutment when the control member is actuated by the power driven mechanism.

16. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch to connect and disconnect the driving member and shaft, a movable clutch control member, actuating means for the clutch control member comprising treadle connections arranged to move the control member idly and power driven mechanism for moving the control member further in the same direction as moved idly by the treadle connections to cause the driving member to be connected to the main shaft, a brake drum on the main shaft, a brake band surrounding the drum, an abutment rotating with the main shaft, a pawl actuated by said abutment for tightening the band about the brake drum, a link connecting the control member and pawl for moving the pawl away from the abutment when the control member is actuated by the power driven mechanism, and a stop cam rotating a, single revolution for a number of revolutions of the main shaft for holding the control member in a position in which the driving member is connected with the main shaft and the pawl is held away from the abutment and after a single revolution of said stop cam for causing the control member to be moved to a position in which the driving member is disconnected from the main shaft, and the pawl actuated by the abutment to stop the main shaft in a definite angular position.

17. A driving and stopping mechanism having, in combination, a main shaft, a driving member therefor, a clutch for connecting the driving member and shaft, means for actuating the clutch to disconnect the driving member and shaft comprising a stop cam rotating a single revolution for a number of revolutions of the main shaft, a brake drum rotating with the main shaft, a brake acting on the drum, a brake lever, means including a projection on the stop cam acting yieldingly on one arm of the brake lever to apply the brake, an abutment on the main shaft, and a pawl mounted on another arm of the brake lever for bringing the main shaft to rest in a definite angular position.

JOSEPH FOSSA.

Images