Patent GB-779459-A (GB)
Title: Improvements in or relating to trimming machines suitable for use in the manufactureof shoes
IPC: A43D87/00
Filed: 1954-09-15
Abstract: 779,459. Sole trimming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Sept. 14, 1955 [Sept. 15, 1954], No. 26708/54. Class 17 (1). A sole trimming machine comprises a trimming knife 14, a work support, 12, a crease guide 20, a forepart gauge 22 to engage the upper close to the crease, a pair of links 44, 102, connected one to the crease guide and the other to the forepart gauge, and operator actuable means to swing both links in turn in one direction, one link then causing the gauge to move into work engaging position and the other link causing the guide to move out of work engaging position. Movement of the operator actuable means in the opposite direction causes reverse movements of the guide and gauge. The support 12 reciprocates and the chopping knife cuts the sole against an oscillating feed point 18. Guide 20 is supported on a slide 24 and is adjusted vertically by screw 30 rotatable in block 32 pivoted to bell crank 36 which is connected to toggles 44, 42 fixed on shaft 48. Spring 70 normally holds the toggles &c. as in Fig 3. When treadle rod 116 is lowered it acts through nut 126 adjustable there on 128, 130 to turn lever 50, freely rotatable on shaft 48, and via arm 52, fixed to shaft 48 and connected to lever 50 by spring plunger 56 engaged in hole 62, or 60 in the lever, to turn shaft 48 and hence break toggle 42, 44 and withdraw the crease guide. The range of movement is limited by adjustment of screws 64, 66 which engage a fixed stop 68. Forepart gauge 22 is pivoted on a slide 82 adjustable heightwise in a block 84, pivoted at 86, by a screw 90, and is normally engaged with the crease guide by spring plunger 88. Screw 90 rotates in a block 92 pivoted to a pivoted arm 96 having an extension 100 connected to toggles 102, 108 fixed on shaft 110. Normally, as shown, arm 112, fixed to shaft 110, is held upwardly by adjustable nuts 118 engaging block 114, the block being forced yieldingly downwards by spring 120 adjusted by nuts 122, but when rod 116 is lowered it acts through 112 to turn shaft 110 and hence to straighten toggle 108, 102, until projection 124 engages link 102, and move the gauge to operative position. The treadle is operated as the knife, having cut the shank, approaches the inner ball line. When the shoe is to have the same sole edge extension at the forepart and shank nuts 126 are adjusted to engage block 128, to disengage the guide 20, at the same time as gauge 22 reaches, its operative position, spring 120 yielding. The cut around the forepart then occurs with screw 64 engaging stop 68. As the knife approaches the outside shank the treadle is released, whereupon the guide 20 is returned by spring 70 &c. but gauge 22 is not retracted until nut 118 engages block 114. To obtain a narrow sole edge around the forepart the shoe is raised relatively to the knife by raising the gauge 22 by means of screw 90 before the work is presented, so that the shoe rises with the crease guide, as the latter is retracted, until the upper engages the gauge. The interval during which the shoe is moved heightwise at the interchange of gauge 22 and guide 20 may be adjusted by means of nuts 126, 118. To obtain a greater sole edge around the forepart the gauge is adjusted downwardly by screw 90, so that the gauge engages the shoe while the latter is still under control of the crease guide. To obtain a still greater edge around the forepart plunger 56 is inserted in hole 60 so that toggles 42, 44, in their normal position, are partially collapsed upwardly, raising guide 20 which can be readjusted relatively to the knife by screw 30. On operation of the treadle the shoe is first lowered by the crease guide as toggles 42, 44 straighten, and then by the gauge 22. Specifications 695,467 and 13301/10 [Class 17] are referred to.