Patent GB-786522-A (GB)
Title: Improvements in or relating to trimming machines suitable for use in the manufactureof shoes
IPC: A43D87/00
Filed: 1955-04-15
Abstract: 786,522. Machines for trimming soles on shoes. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). April 16, 1956 (April 15, 1955). No 10854/55. Addition to 779,459. Class 17(1) The machine described in parent Specification is modified as follows:-(1) a member, e.g. arm 104, connected with the forepart gauge mechanism is mounted for movement by the operator in one part ,to move the gauge to operative position, and is movable in another path by power operated means to vary the operative position of the gauge. (2) The means for supporting the toggle which moves the forepart gauge into and out of operative position is movable by power means, when the toggle has been straightened, in opposite directions during successive cycles of operation of the power means to vary the operative position of the gauge. (3) The slide which carries the forepart gauge and which is slidable relatively to the crease guide holder has a stop member which, by engagement with an abutment on the holder, limits movement of the crease guide into its inoperative position when the gauge is moved to its operative position. With this modified machine a variable width of sole edge extension may be produced along the forepart of a shoe sole. Operation of the treadle (not shown) when the machine parts are in the position shown in Fig. I straightens toggle 94, 98 to move the forepart gauge 20 to operative position, and breaks toggle 36, 38 to retract the crease guide 18 from the position determined by screws 26 and 56 to a position determined by engagement of abutment 82 with the adjustable stop 116. Thus irrespective of the operative positions of the guide and gauge as determined by screws 26, 56, and 86, the inoperative position of the crease guide relatively to the forepart gauge does not change, i.e. the difference in these positions is determined by the effective length of the slot in slide 78 as determined by the adjustment of stop 116. This ensures that even when in its inoperative position the crease guide continues to co-operate with the bottom rest to grip the sole and welt. If the knee pad (not shown) is then operated it acts through 214, 216, 218, 220, 222 to lower link 190 with bell crank 192, and the link through shoulder 224 moves pawl 196 to disengage it from block 198 on lever 200. Pawl 196 is then moved rearwardly by spring 212 and acts through 188 to move clutch lever 180 rearwardly, moving collar 158 on shaft 152 into engagement with sprocket 162, Figs. 1, 2, driven via chain 164, sprocket 166, Fig. 2, reduction gear 168, stepped pulley 170, and belt 172 from motor pulley 174. Collar 158 then drives shaft. 152, and through gears 154, 156 rotates shaft 124 carrying cams 122, 206. Shortly after this rotation begins a lobe on cam 206 moves beyond roll 204, and spring 208 moves block 198 rearwardly so that it again hooks pawl 196. Near the end of half a revolution of shaft 124 with cams 122, 206, roll 204 is engaged by the other lobe on cam 206, so that block 198 is moved forwardly, pulling pawl 196 forwardly away from rod 188, thus relieving the pressure between collar 158 and sprocket 162, and then acting via bell-crank 192 to move link 190 forwardly so that collar 158 is disengaged from sprocket.162 and engaged with the braking shoulder 160. Thus shaft 124 and cam 122 are brought to rest after a cycle of 180 degrees. Cam 122 has rising and falling slopes, each of 170 degrees, and when turned, acts via roll 128, and bell-cranks 130. 102, linked at 140, to swing the latter and move arm 104. The straightened toggle 98, 94 is moved bodily and acts via lever 90 to raise or lower the operative position of gauge 20. The speed of rotation of cam 122 is varied by fitting belt 172 in the required one of three grooves in the stepped surface of pulley 170, Fig. 2, and the range of movement imparted to lever 102, and hence gauge 20 by cam 122 is varied by adjustment of connecting link 140 lengthwiseof arms 134, 136 of levers 130, 102. During. this cam controlled movement of the forepart gauge a similar movement of the same extent is imparted to the crease guide by stop 116, this movement being permitted by lost motion between lever 30 and pin 41. Specification 695,467 also is referred to.