Patent GB-284369-A (GB)
Title: Improvements in or relating to shoe trimming machines
IPC: A43D87/00
Filed: 1926-09-28
Abstract: 284,369. British United Shoe Machinery Co., Ltd., Ricks, F., and Woodcock, R. B. Sept. 28, 1926. Trimming. - A machine for trimming the lateral projecting margins of a heel breast flap, after the flap has been secured to the heel breast, has guiding means to engage the work on opposite sides of the flap adapted to open and close during the operation, to vary the width of cut, this relative movement being capable of control by the operator. The work is moved in the same direction while opposite margins are being trimmed. A rotary cutter is used, and mechanical means are provided for reversing the direction of rotation for opposite sides of the' work. The cup cutter 9 is rotated by a pulley 11 fast on the shaft, outer loose pulleys 13, 15 being provided. A pair of driven belts 10, 12 are controlled by a belt shifting fork 23, one of the belts being crossed to reverse the direction of rotation. The fork 23 is shifted by a yoke 35 yieldingly connected to a shaft 39 pivoted to a multiple lever 43 pivoted at 45 to the machine frame. The lever 43 is operated by a treadle rod 47 pivoted to a double-ended treadle. The machine head 5 carries a slide 51 adjustable forwardly and rearwardly and supporting vertically adjustable guides 59 acting as work gauges and cutter guards. A bracket 71 on the head 5 carries a rectangular yoke 73 pivoted to rock about its longitudinal axis and carrying a double sided breast guide 85 held in normal position by a spring plunger 87. The yoke is normally rocked by a rod 95 pivoted to the lever 43, lost motion being provided by pairs of nuts 99. A spring plunger 101 supporting spaced abutments 105 engaging a bar across the yoke tends to centralize the gauge 85. An adjustable steady pin 113 is provided, intended to be gripped by the third and fourth fingers of the operator as he feeds the flap margin to the knife. As the breast flap thickens towards its root the operator bears on the treadle to rock the guide 85 away from whichever guide 59 is in use. When one side of the flap has been trimmed, the operator reverses the direction of rotation of the knife by the treadle so that with the other guide 59 in use the cut may be in the same direction for the opposite side of the heel. In a modification, the spring of the plunger 101 is weaker, so that the breast flap, as it thickens, can force the guides apart. In another modification, when a somewhat bevelled cut is not desired, the guide 85 is wedge-shaped and the guides 59 are closer together, so that the out is effected by substantially the lowest portion of the cutter. According to the Provisional Specifications, the cutter may be a toothed disc co-operating with work rests and cutter guards comprising pairs of half discs which substantially enclose the cutter except at the cutting point. Hollows in the guards may form rests for the operator's finger. A vibrating cutter may be used. There may be only two guides, vertically adjusted in turn so that each alternately becomes the lower in operation on the two sides of each heel. Instead of being vertically adjusted, each guide in turn may become yielding. The apparatus may be mounted on a handle and driven by a flexible shaft with finger lever controls for the work guides.