Patent GB-621064-A (GB)
Title: Improvements relating to machines for fixing shoe lace hooks, eyelets and the like in work-pieces
IPC: A43D100/02
Filed: 1946-09-02
Abstract: 621,064. Setting eyelets lacing-hooks. BATA, NARODNI PODNIK. Sept. 2, 1946, No. 26383. Convention date, March 3, 1942. [Class 43] A machine for fixing lace hooks, eyelets and the like in two associated work - pieces simultaneously, e.g. into both uppers of a shoe, has opposed pairs of piercing and riveting punches and interposed countermatrices, the punches and matrices being automatically displaced during operation so that the piercing punches operate before the riveting punches, the machine being characterised in that the punches are carried on automatically displaced tongs, the closing of the jaws of which applies the required perforating and riveting force. An automatic device is provided for feeding the work. The pivot 26 of tongs 25 is arranged on a forked arm 27 of a bell-crank lever 27, 28 which swivels about a stationary pivot 29 to cause an up-and-down movement of the tongs when the arm 28 is operated by a cam disc 30 on the main shaft 18. Opening and closing of the tongs 25 is effected by a twohumped cam 33 on the shaft 18 through the intermediary of levers 34, pivoted at 35 to the arms and connected at their free ends by a spring 38, their opposite ends being connected to the arms by set screws 36 and compression springs 37. The tools, arranged on each jaw of the tongs, comprise a hollow hole-piercing punch 39 and a riveting punch 40 which co-operate with countermatrices 46, 47 on a slide 41, which is moved transversely across the direction of feed of the workpiece simultaneously with the tongs 25. A tongue 79 guides the slide 41 and also the workpieces, the latter being fed automatically by a device comprising a body 52 which swivels about a pivot 56 carried by the forked end 58 of a lever 59, which is rockable about a stationary pivot 60. The upper part of the body 52 forms a fork 63 having a pivot 64 guided in a slot 66 and carrying a roller 67 which engages a guide track 50 on a cam disc 49 on the main shaft 18, the curvature of the track causing swivelling of the body 52 about the pivot 56, which can be adjusted in a slotted guide 57 to determine the length of the feeder stroke. The gripping and work-feeding means of the device comprise clamping tongs 53 equipped with rollers 55, opening and closing of the tongs being effected by means of a tension rod 68, guided in a projection 69, and carrying at its lower end a lock head 70 with guide grooves 71 for the arms of the tongs, and at its upper end a roller 72 which is held permanently in contact with the cam disc 49 by a spring 73. Downward movement of the rod 68, effected either by pressing a pedal to pull down the tension chain 75 attached to the spring-abutment collar 74 or by the engagement of the roller 72 with a cam 51 on the disc 49, opens the tongs 53, which are otherwise kept closed by the spring 73. The ends of the piercing and riveting tongs 25 are bent laterally so that in conjunction with a mirror attached to the machine unhampered observation of the work may be had. In operation both sides of the uppers of a shoe are placed between the open jaws of the tongs 53 and are pushed over the guide tongue 79, then the jaws are closed, and the machine is set in motion. Rotation of the main shaft 18 causes the cam 33 to force apart the arms 34 of the tongs 25, whereupon the jaws of the tongs close and the piercing punches 39 make holes in the two uppers of the shoe. The jaws now open again and the tongs 25 are moved upwards by the action of the cam 30 on the lever arm 28, the forked arm 27 swinging the pivot 26 of the tongs upwards and the slide 41 moving upwards under the action of a spring 43, until the riveting punches 40 and the counter-matrix 47 arrive in the working position ; simultaneously hooks are fed to the uppers in known manner. The jaws of the tongs 25 now close under the action of the cam 33, the hooks. being inserted in the apertures and their shafts being riveted or burred over on the matrix 47. During this riveting process the cam 51 comes to bear against the roller 72 and presses down the rod 68 causing the tongs 53 to open and release the workpiece ; the body 52 of the feeder device is then tilted about the pivot 56 under the action of the guide track 50 of the disc 49, and, after reaching the right-hand end position, the cam 51 leaves the roller 72 and the workpiece is gripped in a new position closer to the tongue 79 by the rollers 55, the tongs 53 closing under the action of the spring 73. Meanwhile the hooks have been secured in the uppers; the tongs 25 are then opened and returned to their original position; the workpiece which is clamped between the rollers 55 is now pulled along, under the action of the guide track 50 of the disc 49, a step corresponding to the pitch of the hooks, and the entire operation is repeated.