Patent GB-543547-A (GB)
Title: Improvements in or relating to machines adapted to apply levelling pressure to bottom portions of shoes
IPC: A43D89/00
Filed: 1940-07-27
Abstract: 543,547. Levelling shoe-bottoms. UNITED SHOE MACHINERY CORPORATION. July 27, 1940, No. 12227. Convention date, July 28, 1939. [Class 17 (i)] Relates to machines of the kind described in Specifications 103,849, 269,114, [both in Class 17 (i)], 419,944, and 478,185, wherein a shoe support is swung in opposite directions to carry the shoe to and fro beneath a levelling roll, and consists in the provision of fluid operated means for swinging the support and a hand lever arrangement for controlling the fluid operated means, the movement of the hand lever causing movement of the shoe support in the same direction and at a corresponding speed. A similar arrangement imparts the usual tipping movements to the roll. In addition, the roll is automatically raised as the toe end of the shoe passes under it, to prevent excessive bending of the sole margin, and a fluid check is provided to' retard the movement of the roll towards the shoe thereafter. The heel post is freely pivoted to the toe post : to lock the two in relative angular position when a shoe has been jacked, a toothed segment 60 is pivoted at 57 to the toe post, and carries a strip 78 normally held raised by a pin 80 on the jacking lever 50 described in the prior Specifications. A ratchet plate 66 is secured to a plate 68 pivoted at 70 to the heel post and carrying a pin 72 restrained by a slot 74 in the heel post. A spring 82 urges the segment against the ratchet plate. The shoe is swung to and fro beneath the roll by a toothed segment ,154 secured to the toe post and meshing with a pinion 184 also meshing with a rack 182 reciprocated by a pair of pistons 190, 192 supplied with fluid by a valve similar to that actuating the tipping mechanism. A pinion 302 moves with the pinion 184 and gears with a rack 300 linked to a lever 290 pivoted at its other end to the valve, and fulcrummed on links 288 pivoted to a bell-crank lever 280 linked to the swing handle 274. As this handle is moved, fluid is admitted to one cylinder and exhausted from the other, moving the rack 182 to swing the jack in the same direction as the handle is swung. The effect of the rack 300 is to shut the valve unless the handle continues to swing, so that the jack swings, stops and reverses exactly as the handle 274. The tipping mechanism comprises similar pistons 222, 224 reciprocating a rack gearing with a segment 208 under the control of a valve 612 comprising a sleeve held between bars 648,650 urged together by a spring and shaped to afford a passage 614 for pressure fluid from a pipe 248 to either piston. When the valve is shifted by tilt of the lever 632 one cylinder is supplied with pressure fluid and the other is opened to exhaust. The lever 632 is supported by a link 630 pivoted to a bell crank lever 624, linked to a pivoted handle, and the arrangement is that tip of the lever 632 causes that movement of the segment 208 which restores the valve to its mid position, so that the handle controls tip of the roll in every respect similarly to the hand control of the swinging movement of the jack. When the shoe is jacked and the jack is swung towards the roll a rod 372 urged to the left by a spring is allowed to move to straighten toggle links 384, 386. The consequent depression of a rod 380 increases the spring compression in a pressure regulating valve 246 to the working pressure. Fluid at this increased pressure passes by a passage 532 raising a piston 516 separated by a spring 518 from a fixed spacing ring 510 apertured to admit fluid to a second piston 500 the function of which is to raise the roll as the toe end of the shoe passes thereunder. The control valve 528 for these pistons is connected to the rod 372, the arrangement being that when the toe end of the shoe has passed under the roll the valve is depressed, cutting off pressure fluid from the two pistons and allowing the fluid under the pistons to escape to a chamber 536 having an overflow to the main reservoir. The descent of the valve 528 is under the control of a fluid check, a ball non- return valve being adjustable by a screw away from a hole it obturates. Once the hand lever 274 has moved the shoe under the roll it is normally prevented from swinging forwardly so far that the toe end again engages the roll. One arm 716 of a bell crank lever pivoted to the hand lever co-operates with a fixed pin 718 to stop the forward swing. When it is desired to continue the swing for the removal of the shoe the bell crank lever is freed by depression of a part 696 of the handle against a spring, a slot at the lower end of this part co-operating with a pin 720 on the lever. A treadle 692 moves the rod 372 rearwardly, when desired, sufficiently to lift the valve 528 which admits fluid to raise the roll from the shoe. The treadle can be used to keep the roll raised when portions not desired to be compressed are passing under the roll, or by opening the fluid check to the descent of the valve 528 and alternate depression and release of the treadle, to impart a number of hammer blows to any part of the work which needs this treatment. An adjustable stop for limiting rearward swing of the jack is mounted on the heel post, so that adjustment of the jack for length of shoe thereon ensures the levelling terminating at approximately the same point at the shank for all lengths of shoes.