Patent GB-567186-A (GB)
Title: Improvements in or relating to shoe machines having conveyors arranged to be moved step by step
IPC: A43D25/06
Filed: 1943-05-06
Abstract: 567,186. Sole-laying machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). May 6, 1943, No. 7168. [Class 17 (i)] In a sole-laying machine of the revolving turret &c. type the turret is rotated by a multicylinder-fluid motor under control of valve means regulated by cam means movable correspondingly with the turret &c. Each press has a cylinder, the pistons being all linked to a stationary off-set abutment. A treadle is provided for bringing gauging means of the kind described in Specification 540,890 into action, and a second treadle for pressing the shoe on to the pad. A handle is provided for the intermittent rotation of the turret, which handle may be dispensed with, automatic rotation following the reaching of a predetermined pressure. The operating fluid is contained in the base 12 of the machine. An electrically driven pump provides high pressure for work pressing and low pressure for turret rotation with the aid of pressure-regulating valves. The treadles actuate similar valve mechanism, each comprising a treadle rod 280 pivoted to parallel arms 278 pivoted to a valve spindle 274. The spindle is rotated by a pawl 266 also pivoted to the arms and rod, a detent 302 holding the spindle in the position to which it has been moved. The pawl is tripped by a tail 298 engaging a stud 300. The workholding mechanism comprises a pair of bails 70 at each pad carrying a toe pad and a heel abutment respectively. The links 74 nearest the operator are spaced wider than the rear links, to facilitate work-changing. The bails are pivoted at 89 to an equalizing lever 88 carrying a wedge segment 98 co-operating with a grooved member 96 secured to a piston by which pressure is exerted on the work. Play between wedge and groove is taken up when the heel and toe abutments press on the work. The bails are urged upwardly by springs and depressed by a piston 102 when the work has been positioned and the bails swung over the shoe. The piston is of the kind described in Specification 542,767, [Group XXIX], having an upper portion 102 of small diameter and a lower portion of large diameter for producing a considerable cementing pressure on the work. A passage 137 fitted with a ball non-return valve prevents fluid being trapped in the lower cylinder by sudden rise of the piston. When, on the descent of the piston a port 120 is uncovered pressure fluid depresses a valve against the thrust of a spring 124 to close the exhaust passage 118 by which fluid is returned to the reservoir. Each press carries a pair of downwardly projecting plungers 232, 250 which, when the press is in the operator's (work-changing) position align with a head 210 and a table 254 respectively. The head 210 is raised by fluid pressure admitted when the first treadle is depressed and causes the gauges to position a sole placed on the pad. When the shoe has been positioned, the bails are swung inwardly over the shoe and the second treadle is depressed to admit fluid to the cylinder 84. On the full cementing pressure being reached fluid from the chamber 108 depresses the head of the plunger 250 which depresses the table 254 to move the first treadle-operated valve to the off position.. In case either of the plungers 232, 250 should foul their co-operating members as the turret rotates, each is hinged and urged to straightened position by a spring. When the work has been placed under full cementing pressure the handle 350 is moved to the left. Normally this handle is latched to an arm 402 actuating a slide valve 360 carrying a roll 364 normally resting in recesses between raised portions 368 of a cam rotating with the turret. The roll is maintained in the recess by the fluid pressure acting on a shoulder 372 of the valve. The movement of the handle is assisted by a piston in a cylinder supplied with fluid from the bail-actuating cylinder' 84. Pressure in this cylinder may be so adjusted that rotation of the turret may automatically follow the attainment of full pressure in the press in which work has last been placed. Movement of the valve 360 cuts off pressure fluid from the cylinders 34 of the two presses next to arrive at the operator's position. The pistons in the remaining cylinders act on the abutment 54 to rotate the turret. As the cam 368 moves the valve further to the left the speed of the turret increases to the maximum and then decreases to come to rest as the next recess reaches the roll 364. Specification 479,480 also is referred to.