Patent GB-767131-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/18
Filed: 1954-04-10
Abstract: 767,131. Pulling over machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). April 12, 1955 [April 10, 1954], No. 10610/54. Class 17 (1). A pulling over machine comprises a heel rest which is movable laterally to different positions for right and left shoes and positions the heel end of a shoe laterally by engagement therewith, power operated means for automatically moving the rest to one of said positions prior to operation on one shoe and to the other position prior to operation on the next shoe, and means to move the rest from either position lengthwise into engagement with the shoe. Side grippers are automatically moved to different positions for operation on right and left shoes simultaneously with corresponding movements of the heel rest. The power operated means may be rendered inoperative when successive similar shoes, instead of alternate right and left shoes, are to be operated upon. The shoe is presented as in Fig. 1 so that it is supported on presser feet 10, 12 with the upper engaged between jaws 6 of toe gripper 2, and spaced pairs of jaws 8 of side grippers 4, and at the beginning of the cycle heel rest 14 is moved to engage the shoe. Rest 14 is supported on slide 18 movable along bar 20 pivoted at 22. and is moved tn different lateral positions when the bar is moved by piston 26 or 28 which are connected by rack 30 and act through pinion 38 and teeth on slide 44 which is movable widthwise and engages a roll 48 on bar 20. Fluid to actuate pistons 26, 28 is supplied through 52, 54 under control of a valve 68 (not shown) which has ratchet teeth engaged by a spring pressed pawl on a carrier having teeth which engage a rack bar integral with a spring-returned piston, so that when the piston is moved by fluid pressure the valve is turned to actuate piston 26 or 28. Movement of the rack bar and pawl carrier is limited. When the heel rest is to remain in one position, to act on similar successive shoes, a stop is moved manually to a position in which it prevents movement of the pawl carrier, and hence of the valve. The valve may then be turned manually if desired, a spring pressed detent which engages recesses in the valve determining the proper position of the valve and holding it in that position. Slide 18 is moved toewardly by fluid passing from pipe 290 to a cylinder in slide 18 via a bore in a piston secured to bar 20 and housed in the cylinder, pipe 290 and the cylinder being in communication in all positions of bar 20. Lengthwise movement of slide 18 is adjustably limited. Arm 256 connected to bar 20 and arm 260 act as a toggle when bar 20 swings, and a roll on arm 260 contacts a stop 296 adjustable by screw 298 to limit the swing. Pointer 302 and scale 304 indicate the position of bar 20, and spring 306 holds the bar in position when the machine is idle. Side grippers 4, which are positioned for operation on right or left hand shoes by turning about axes X, are pressed inwardly by springs 152 on blocks 154, the distance between grippers being determined by wedge 150 movement of which allows the grippers to move inwards after release of the upper and then to return, blocks 154 being moved along arcuate guides 158 by pistons 176 acting through 174, 172, 168, 162, 160. Pipes 182, 184 supplying fluid to move pistons 176 communicate with pipes 52, 54. Spring 186 holds lever 162 in either position when there is no pressure in the manifold. Toe gripper 2 is moved widthwise simultaneously with the shifting of the side grippers, the movement of block 174 acting through 190, 194, 196, gear 198, and rack 200 slidable widthwise of the shoe and connected to the gripper by members 202, 204 which permit heightwise and lengthwise movement of the gripper lever 212, by which the gripper is moved heightwise, is connected by pin 210 located in a shaped recess which permits the lateral movement of the gripper. Movement of grippers 2 and 4 is limited by stops 214 adjusted by turning knob 226. Blocks 154 may be adjusted simultaneously rearwardly or forwardly by turning handwheel 240 which through 238, 236, 234, 230, and lever 166 bodily moves lever 162 pivoted on the latter. Lengthwise swinging of toe gripper 2 about 210 is controlled by slide 324. Initially block 326 on the slide engages in recess 328 on slide 332 mounted on the gripper to hold the gripper as in Fig. 1 when it acts as a stop for the presentation of the shoe. At the beginning of upper pulling the gripper moves to pull the upper downwardly, and slide 332 is held by spring 336 against movement with the gripper until it is contacted by a lug 342 on the gripper. Cam face 340 then engages block 326 and so swings the gripper outwardly to pull the upper lengthwise as well as heightwise. Near the end of the pulling operation slide 332 is moved downwardly relatively to the gripper by a piston 348 acting through chain 346 so that block 326 is cleared from recess 328. Slide 324 is then retracted and spring 344 swings the gripper inwardly over the shoe bottom to make way for wiping and fastening mechanisms. Slide 332 and piston 348 are returned by spring 336. Side clamps 356 associated with heel rest 14 each comprising a pair of pads 358 and being movable about pins 364 are urged outwardly by spring 374 to a limit determined by contact of pistons 376. Further movement of a block 16 after the heel rest has engaged the shoe causes fluid to operate pistons 376 to move clamps 356 inwardly to clamp the shoe. To ensure that the upper at the sides of the heel end is pulled adequately the apparatus includes a valve arrangement by which the pressure of the clamps on the upper is momentarily relieved and then applied again in full. At completion of the upper pulling operation the machine stops with the upper tensioned by the grippers and the operator can adjust the pulling action of the grippers. When the machine is restarted clamping devices 444 engage and hold the shoe, and wiping devices 446 and locking devices 448 operate.