Improvements in or relating to shoe machines for operating progressively along opposite sides of a shoe at the same time

摘要

215,772. United Shoe Machinery Corporation, (Assignees of Lawson, R. H.). May 9, 1923, [Convention date]. Boot-sole stitching and lasting machines; starting and stopping gear; lasts, mounting. - Both sides of a shoe upper are progressively and simultaneously lasted and secured by stitching to the sole. Means are provided for compensating for the curvature of the sole so that the pull of the grippers shall be normal to the longitudinal curve, so that the opposite sides shall remain in correct vertical relation and so that the needles shall move normally to the attachment rib. The jack is movable into and out of operative position and this movement being variable in extent according to the size of the shoe is utilized to regulate the feed mechanism automatically. Automatic stopping mechanism is provided which disconnects the lasting mechanism and pattern cam from and couples a jack-shifting mechanism to the driving mechanism the machine being automatic except for the removal and replacement of a shoe &c. the movemerut of the jack and shoe into the starting position. The machine is used in the manufacture of shoes according to the method described in Specification 206,175. It is found necessary to secure the upper by temporary means. The sewing and lasting tools comprise needles 3, locking-loop forming needles 4, loop detainers 5 and grippers 1 each set being carried on a support comprising a cylindrical part 6 and carrying a block 9 which serves as a presser-foot and as a channel guide to engage the ribs of the bootsole. The parts 6 are mounted in blocks 10 carried by trunnions 11, 12 from which project arms 15 having intermeshing segmental gears 16 which thus cause the stitch-forming and lasting devices to move in unison. The channel guides are pressed against the rib by a spring 18, Fig. 9 the tension of which is varied by a connection 19, 20 to the pattern cam mechanism. To the arm 17 to which the spring is attached is secured a rod 21 connected through a lever 22 to a bar 23 which may be locked by locking rolls 25, releasable by a plunger 26 controlled by a cam 27 so as to lock the supports during the stroke of the needles 3. The supports 6 are given rotary positioning movements through rods 31, levers 32 and links 33 actuated from the pattern-cam so as to compensate for the edge curvature of the sole and. rib. The gripper-jaws are caused to approach by a pin and inclined slot device. and a friction device is employed to cause the closing of the jaws to take place before their upward movement comprising a toggle 46, 48 the member 46 of which carries the actuating pin and is connected by a rod 49 to a cross head 50. The crossheads 50 are connected to a cross-head 52 by a link connection 51 allowing rotation of the crosshead 50. The cross-head 52 is actuated by a cam on the shaft 28 through a. lever 54 connected to a spring 57 the tension of which is adjustable by the pattern-cam mechanism so as to vary the upward pull on the grippers. The jack-support comprises a hollow spindle 118 connected by a gimbal joint to a ring 119 mounted on an arm 123 which is pivoted' to swing vertically on a support 124. The support 124 is mounted on a vertical axis in a frame 125 mounted at its lower end on a horizontal axis. The arm 123 is urged upwardly by a cord 126 connected to a spring. The ring 119 is connected to the frame 125 by a parallel motion link 131. The jack is fed longitudinally by mechanism comprising a feed-lever 132, Fig. 3, connected to the jack by a bar 133 and to a cam-actuated lever 134 by links 135, 136 connected at their pivoted ends to a guiding link 137. The lever 134 is actuated by a pattern cam 138 on a shaft 139 rotated once in each complete lasting operation. The link 137 is pivoted on a lever 140 held locked during the operation on a shoe but movable when unlocked to vary the length of feed. The rod is locked by mechanism comprising a rod 142 which may be clamped within a block 143 by camlevers 144 operated by a rod 146 connected to an arm 147 linked to a lever 149 which is engaged by a catch 150. A shoe is placed on the jack out of operative position and the act of so placing it unlocks the lever 140. In moving the jack to operative position the toe of the jack and therefore the rod 133 will require to be moved through varying distances according to the size of the shoe and hence the feed mechanism will be set for feeds of different length. The frame 125 is actuated to give the transverse tipping movements to the jack by a cam on the shaft 139 engaging a lever 151 on a shaft 252. The support 124 is swung to give longitudinal tipping movements by a cam on the shaft 139 and connections 154, 155. The turning movements of the supports for the stitch forming and lasting devices are conveyed by mechanism comprising levers actuated by cams on the shaft 139 and connected to vertical rock shaft 160, 161, each having an arm retained by a spring in engagement with an arm on one of a pair of shafts 164 which have arms connected to - the links 33. The mechanism for varying the tension of the spring 18 which tends to separate the supports comprises a cam 167, Fig. 42 and a lever 169 connected to the rod 20. The tension of the spring which determines the strain of the grippers is varied by a three-armed cam 168 and an arm secured to a rock shaft 17 carrying an arm connected by a link and lever 174 to the spring and is first light at the heel then heavy and then light again. The jack comprises a toe supporting arm 320 rigid with the spindle 118 and a pivoted heel supporting arm 321 carrying the last mounted on pin 323 supported by a lever 324 controlled by a segmental gear 325, 326 and a spring 327 so as to press the toe against its support. When the jack is out of lasting position the heel-supporting arm is held away from the toe-supporting arm by a toggle 328, 329 which is broken by the placing of a shoe on the jack through the action of a spring plunger 332 which engages the last and presses against the lever extension 334. The movement of the arm 321 is limited by a rack-bar 335 engaging a pinion connected to a ratchetwheel 338 engaged by a pawl 339. When the arms 320, 321 are separated the pawl 339 is held out of contact with its ratchet wheel by a projection 340 and as this is removed owing to movement of the bar 335 a catch 341 takes its place until released by the action of a feeler-lever 343 which is engaged by the toe of the shoe. A dashpot comprising a plunger 346 operated by pinion 337 retards the movement of the arm 321. The toggle arm 329 is pivoted to a lever 330 which may be actuated to straighten the toggle by a lever 349 having a segmental gear engaged by a pinion on a shaft 353. A gauge for the jack is provided comprising a bar 303 having a vertical slot 304 flared outwardly and engaged by a stud 302 on the jackbar, the bar 303 sliding in a guideway and adapted to be moved into operative position by a hooked link 306 engaging a pin on a cutter operating arm 283. The lasting and pattern cam mechanism are driven from a sleeve 175, Figs. 6 and 7, clutched to a power shaft 176 by a clutch 177, 178 and geared to the shaft 28 and also to a shaft 182 having a unidirectional clutch connection with a shaft 185 actuating the pattern cam so that the latter can be moved independently. The shaft 185 is geared to a shaft carrying a series of similar gearwheels meshing with a gear-wheel on the pattern-cam shaft 139. This shaft carries a number of sets of cams corresponding to different styles of shoe which may be brought into operative position by longitudinal displacement of the shaft 139 effected through manual screw adjustment of a shaft 190 on which the shaft 139 rotates, automatic means being provided for moving the cams out of action while the adjustment is effected. The cam 168 controlling the pulling strain is driven by gearing including a gear 201 causing a rotation of one third of a revolution for each rotation of the shaft 139 and is therefore formed as a three armed cam. The cam 167 is driven from the gear 201. The stopping-mechanism which comes into operation when the lasting is completed comprises a bell-crank lever 202 engaging a cam groove 203 in the sleeve 175 and engaged by a locking bolt 204 which is held retracted during lasting so that the lever vibrates idly. The bolt 204 is carried by a spring controlled carrier 207. When the bolt is released and engages the lever the carrier is moved to the right and then partly returns till stopped by a spring latch 210. The lever being now held stationary the rotation of the cam 203 disengages the clutch and applies a brake. The means for holding the locking-bolt retracted comprises a spring-pressed rod carrying a detent 219 which engages a latch 220. The latch 220 is retracted to stop the machine by connections with the pattern-cam shaft comprising a lever 224, a dog 230, Fig. 5, in the form of a bell-crank, an arm 228 engaging the dog and a lever 226 adapted to be engaged by a block 225. Mechanism which comes into action when the lasting mechanism is disconnected for depressing the jack, severing the threads moving the jack outward and to giving a final movement to the pattern cam mechanicism and comprises an eccentric 231 adapted to be clutched to a continuously rotating shaft by a lever 239 engaging a clutch-block 233 and engaged by a projection on a rod 240 connected to an arm 241 on a rock-shaft 400 which also carries an arm 242 having a gear segment meshing with a gear on a bell-crank 243 a fork on which engages the bolt carrier 207. The lever 239 is held in declutched position by a spring pin 244. When the stop-motion is operated the movement of the carrier 207 will raise and lower the rod 240 and effect the engagement of the clutch 233 with the eccentric. The mechanism actuated by the eccentric includes vertically aligned rock-shafts 253, 254 connected by a key