Patent GB-319056-A (GB)
Title: Improvements in or relating to sole pressing machines
IPC: A43D35/00
Filed: 1928-06-16
Abstract: 319,056. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). June 16, 1928. Sole-laying.-Relates to sole-pressing machines having a group of work-supports and corresponding sole-pressing devices arranged on a carrier having rotary movement about a, horizontal axis and adapted for movements of approach and separation both radially and laterally of the turret, for sole-pressing and for work-changing, respectively, and consists in detail improvements. Means for locking the pressing member and work support in operative position are provided, these means being independent of the means arranged by rotation of the carrier to cause approach of the parts. These locking means move with the carrier in its rotation. The sole pressing member is pivoted on an axis transverse of the work, nearer the heel end than the toe end, and mounted on a pivoted arm movable to carry the member against the work. The machine is driven by a worm wheel 18 on a horizontal axis 16 carrying four work supports 26. The worm wheel is formed with four projections 22 which free a clutch on the worm shaft at each quarter revolution, the machine being re-started by depression of a treadle. Each work support is spring-pressed laterally, but normally retained in operative position by a fixed cam 30 formed with a recess, at the top to receive a roller 28 on the work support as this reaches the uppermost position and allow the support to tip towards the operator for work-changing. The axis 16 carries four radial arms 14, between the four work supports. To each arm 14 is pivoted an arm 34, the outer end of which is urged inwardly by a spring 88. Outwardly of each jack is arranged a soleprefer 46, pivoted on a transverse axis 47 nearer the rear end of the presser, the axis being carried by a bell-crank lever 42, pivoted to the arm 34 at 44 and urged inwardly by a powerful spring 52 adjustable by a nut 54. The pivot 44 is linked to a rod 58 gliding longitudinally in a guide 56 and formed with tooth for engagement by a pawl 68 pivoted in a slide block 66, the tail of the pawl being linked to a lever 78 operated by a cam roll 82 actuated by a cam 83. A cam roll 36 on the arm 34 co-operates with a fixed cam track 38 for lifting the uppermost sole support for work-changing. The block 66 is formed with a lateral projection co-operating' with a latch 92 the. tail of which is engaged by a fixed cam 98 for freeing the latch before the work is released. Fig. 2 shows the uppermost jack ready for the insertion of work. In operation, a shoe ispositioned on the jack and the treadle depressed. As the carrier rotates, the roll 28 carries the workto vertical position and the cam track 38 allowsthe spring 88 to move the sole presser 46 into contact with the work, the plunger 36 sliding past the pawl 68. On the cam roll 82 reaching the hump 84 on the cam 83, the pawl 68 is first engaged with a tooth 64 and then further retracts the plunger 58, yield being provided by the spring 52. At this point, the latch 92 is released and locks the plunger 56. The work' is thus kept under pressure, independent of the cam 83, while work is changed on the other three jacks, on these, in turn, reaching the uppermost position. On the first jack reaching this position, a second hump 86 slightly retracts its plunger 58, its latch 92. being then moved to inoperative position by the cam 98. To prevent damage, should the machine be started with no work on the jack, the plunger 58 has secured to it a stop 106 which then contacts with the block 66 and lifts the cam roll 82 from the low part of its cam.