Patent GB-313977-A (GB)
Title: Improvements in or relating to boot or shoe sewing machines or methods of making boots or shoes by the use thereof
IPC: D05B15/00
Filed: 1927-12-21
Abstract: 313,977. British United Shoe Machinery Co., Ltd., and Bates, A. Dec. 21, 1927. Boot-sole stitching and lasting machines.-The inturned edge of a shoe upper is united, e.g. by sewing, to the sole by presenting the upper and sole to the machine and lasting the upper over the sole during the movement of the work towards the needle. A gripper capable of being put automatically or manually out of action during any part of the sewing process effects the lasting, and a wiper operated by the gripper mechanism assists in producing a snug fit of the upper edge on the last. The four-motion channel guide has a sharp end and corrugated under surface to feed the work, dispensing with the usual awl when the gripper is out of action and to assist when the work is being fed by the slide. With the machine at rest and the needle 1 retracted, the channel guide 113 is engaged in the channel. Upon starting the machine, the gripper 7 descends under the action of the lever 9, rod 27 and eccentric 29, and the jaws 15, 17 are closed over the edge of the upper by the plunger 65 and lever 63, actuated by a cam in the manner described in Specification 13873/10. At the same time the channel guide actuating lever 111 causes the guide to dig into the insole lip and the wiper 143 is swung outwardly about the rod 146 owing to its connection, through the resilient rod 156, with the channel guide lever actuating member 123. This causes the wiper to engage the shoe upper just above the edge of the last and urge it towards the sole to form a snug fit. The updraw lever 9 meanwhile is raised by the eccentric 29 imparting a yielding upward tension to the shoe upper and the feed slide 120, as described in Specification 13873/10, moves to carry the portion of the shoe gripped by the jaws 15, 17 to the needle 1. While the jaws are pulling the shoe upper upwards, they are swung over the sole owing to the pivotal mounting 39, and move with the feed owing to the ball joint 43. The lasting and feeding operations thus occur simultaneously and the work is presented to the needle in a tensioned correctly positioned condition. After the needle has completed a stitching stroke, the channel guide and wiper retire and the gripper jaws open ready for the next lasting and feeding stroke. This operation may be continuous round the toe and the two sides of the shoe if desired. If the lasting operation is desired to be omitted at the toe, the toe having been previously lasted in a machine such as described in Specification 142,931, [Class 17 (i), Boots and shoes, Apparatus for making &c.], as would be the case for welted shoes, a finger 112 is tripped. As each stitch is made, the pawl 95, pivoted on a link 93 moved by the eccentric 29, moves a ratchet wheel 91 one tooth. The ratchet rotates an eccentric 85 to cause the gripper actuating lever 9 to be drawn down by the links 75, 77, 83. A catch pin finally moves the finger 112 and a shield member 114 to cause the pawl to disengage the ratchet teeth and ride idly over the shield 114.