GB716395A - Improvements in or relating to shoe upper lacing machines - Google Patents

Abstract

716,395. Shoe-lacing machines BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation) May 12, 1953 [May 13, 1952], No. 12052/52. Class 43 A shoe-upper lacing machine of the type described in Specification 474,025 having a cord tensioning device is provided with adjustable means for stabilizing the timing of alternate tensioning and relaxing of the lacing cords by said device irrespective of the thickness or number of said cords, comprising an eccentric rotatable by an adjusting member and means for determining various positions to which said adjusting member may be moved on changes being made in the number or thickness of cords. This stabilization is effected by maintaining constant a lost motion for all total thicknesses of cord in use. The tension device comprises pairs of washers 24 between which the cords are disposed after passing through supply tubes 36 on their way to the lacing mechanism via the notched thread-engaging plate 18 'secured to takeup actuating arms 20 rocked by rockshaft 22. Tension on the cords is applied by clamping pressure exerted between the washers of each pair by a spring 30, Fig. 4, adjustable by nut 34, the pressure being released by the forked arm of a bell crank lever 38 acting on a slider 32 against spring 30, the lever 38 being rotated on vertical pin 40 by a lever 42 having spaced hub portions rotatably ad justable on the rock-shaft 22 to vary the lost motion gap between the levers 42 and 38 to compensate for lack of uni fbrmity in timing of the application or release of clamping pressure on the washers 24 due to variations in the lost motion provided between lever 38 and slider 32, brought about by variations in total cord thickness. This lost motion also ensures uniformity of clamping pressure for all total cord thicknesses. The hub of lever 42 has secured to it a perforated plate 48. An eccentric portion of the hub of adjustable arm 52 rotates on a shoulder screw 50 secured to the hub of lever 42 and within a block 54 connected by rod 56 to a rocking cam and lever mechanism, the arrangement being such that rotation of arm 52 in block 54 causes lever 42 to be shifted with respect to curved surface 44, Fig. 6, of the lever 38 to vary the lost motion gap therebetween. The plate 48 is calibrated as to sizes of total thickness by a series of holes 70 with suitable indices 72 and the arm 52 is retained in adjusted position by a slidable spring-pressed plunger 74.