Patent GB-280677-A (GB)
Title: Improvements in or relating to machines for preparing welted boots and shoes for the sole-laying operation
IPC: A43D49/00
Filed: 1926-10-04
Abstract: 280,677. Gimson Shoe Machinery Co., Ltd., Vyse, H. E., and Denne, M. T. Oct. 4, 1926. Trimming.-A welt-butting machine has a pair of shoe clamping and supporting jaws, carried by a pair of rocking levers, a pair of welt-positioning and upper tightening wipers carried by a second pair of rocking levers, means to impart unyielding movement to the first pair of levers, and means whereby said levers impart yielding movement to the second pair of levers. Equal pressure is applied to the two sides of a shoe, whether a right or left shoe is being operated on. The weltbutting knives are each carried on a spindle which has rotary movement about its axis to depress it for the cutting movement, and a longitudinal movement during the cutting stroke. Each spindle carries a spring-pressed ironing foot. A heel-end engaging member carries a vertically adjustable heel seat engaging finger, the member being adapted either to be locked initially in a predetermined position, or to yiefd as the shoe is positioned and then to be automatically locked at the commencement of the subsequent automatic operations. The shoe is positioned against a heel end engaging member 9 backed by a spring 17 and provided with a vertically adjustable seat engaging member 20. The member 9 is provided with teeth engaging a pinion 10 which may be locked in adjusted position by a retractible spring plunger, the arrangement being that the operator may set the member 9 in predetermined position, or he may push it back with the shoe, a brake being then applied by a cam when the machine starts, to hold it in position. The shoe clamping and supporting jaws 25 are each self-adjusting about a horizontal pivot, friction being provided by a spring pressed plunger. These jaws are carried at the upper ends of levers 26 pivoted on studs 27 on carriages 30 laterally adjustable towards or away from each other by a right and left-handed screw. The lower ends of the levers carry rolls engaging a wedge 32 sliding vertically in a carriage capable of free lateral motion and operated by a treadle rod 34. Welt positioning and upper tightening wipers 40 are mounted on a pair of levers 41 also pivoted on the studs 27 and actuated yieldingly by the levers 26 by springs 44. The effect of this construction is that the jaws and wipers adjust themselves to apply equal pressure to the shoe whether a right or a left shoe is being operated on. On each side of the shoe a welt-butting knife 60 is carried on a spindle 61 mounted for longitudinal and rotary movement. The longitudinal movement is imparted by a crank-pin 69 engaging a block sliding in jaws 67 moving in guides running front to rear of the machine. The spindle 61 is normally urged by a spring 63 in a direction which maintains the knife raised, but on forward travel of the spindle, a roll thereon engages a fixed cam to twist the spindle about its axis and depress the knife, further forward movement effecting the cut. The tack drum is constantly driven, and one of the sprocket wheels in its driving train is used to operate the divider near the end of the cycle. A cam 92, Fig. 9, formed with a recess for declutching the machine after one revolution, carries a pawl normally kept out of contact with a ratchet wheel 93 operating the divider. Near the end of the cycle an arm 96 is freed to allow the pawl to drive the ratchet for one rotation the pawl being disengaged when it arrives at its original position. The shoe is positioned manually, the welt-end ironing, butting and tacking mechanisms being automatic and set into operation by a hand device which engages a driving clutch.