Patent GB-455712-A (GB)
Title: Improvements in or relating to punching or perforating machines
IPC: C14B5/00
Filed: 1935-03-23
Abstract: 455,712. Punching-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., KEALL, F. B., and MAWBEY, L., Belgrave Road, Leicester. March 23, 1935, No. 9115. [Class 31 (ii)] In a punching-machine particularly for ornamenting boot or shoe parts in which the work is fed by the punch and is backed by a strip of material fed across an anvil, (a) the punch is hollow and communicates with a suction device whereby the punchings are removed ; (b) the punch is supported by a parallel linkage arrangement to obtain substantially no rocking movement during its feeding operation ; (c) the backing strip passes to and from the anvil on one side of the machine and envelops the anvil by a substantially closed loop whereby a substantially tubular workpiece can be threaded over the anvil. The tubular punches 31, Figs. 1 and 12, are carried by a hollow block 99 mounted on a punch bar 69 by a screw 103 which allows the punches to turn when feeding round a curved portion of the work. Premature turning of the punches is prevented by a spring-pressed plunger 113 engaging a notch in a lug 109. The punches are turned back by co-operating inclined surfaces on lugs 105 and a bracket 75 on the frame 71 in which the bar 69 slides. The punches are depressed against the action of a spring 73 by a lever 29, Fig. 2, which is rocked by a cam 23 on a shaft 15 co-operating with a roll 27 on the lever. The punches 31 are fixed to plates 117, 119 which are clamped to the block 99, with a dovetail connection, by a screw 127, Fig. 1, and plate 125. The lever 29 is mounted on an eccentric portion 47, Fig. 2, of a shaft 49, adjustment of which alters the heightwise position of the punches at the end of their downward movement. If the machine is to be used for single punching operations, the punch is caused to rise less distance from the work by a screw 59 engaging a lug 63 on the lever 29. Lift of the punches during feeding of the work effected by forward and rearward movement thereof is controlled by a cam 21 acting through a roll 25 eccentric to a stud 35 on which the roll 27 is concentrically mounted ; rotation of the stud 35 against the action of a spring-pressed plunger 45 by a screw 37 engaging an upward projection 41 thereon adjusts the lift without affecting the punching adjustment. The frame 71 has extending rearwardly therefrom an arm 81 which is pivotally connected by pins 85, 83 with forked arms 77, 79 on shafts 87, 89. The shaft 87 carries an arm 141, Fig. 3, pivotally connected to a link 145 which is connected at its other end at 147 to a cam lever 155 by a link 149 and to a feed adjusting lever 163 by a link 151 ; the cam lever 155 is pivoted to the machine frame at 158 and cooperates with a groove 159 in a cam 161 so as to rock the shaft 87. When the frame 71 is at its forward position, the pivots 143, 153 are aligned so that adjustment of the lever 163 about its pivot 165 does not shift the frame 71 ; the punches thus always start to feed from the same position. When the lever 163 is in its lowest position, a feed of ¥" is obtained, and when in its highest position there is no work feed. The maximum feed may be reduced to ¢" by removing the pin 85 and replacing it in holes 167 nearer the shaft 87. Two scales 169 are provided for the two positions of the pin 85. Lever 163 is clamped in position by a hand nut 179. Presser feet 181, 183, 185, Fig. 1, provided to the right, left and rear of the punches are all mounted on a presser bar 187 slidable in a bracket 61. They are raised automatically against a spring 189 during the feeding of the work by a cam operated lever 197, Fig. 2, and can be raised to receive work by a treadle mechanism. An edge guide 216, Fig. 1, is provided and the work is held down adjacent thereto by a spring-pressed pivoted leaf-spring 231. The edge guide is pivoted on a vertical stud in an adjustable block 221 mounted on a trunnion block 245 which is pivotally mounted at 246 on an arm 255 pivoted to the bracket 61 at 254. A guide rod 257 extending upwardly from the trunnion block 245 passes through a swivel block 259 on the machine frame. The edge guide is held in operative position against the action of a spring by a spring-pressed pivoted latch 260. For operating on flat work, the anvil 261 is provided with a table 269 held in place by suitable lugs and pins, while for operating on tubular work, such as a closed shoe upper, a cover 271, Fig. 16, is fitted over the anvil and held in place by a pin 273 and a spring clip 275. The backing paper 263, Fig. 2, passes from a roll 295 under a roll 327, between a spring- pressed roll 331 and a surface 329 on a lever 317, through a curved tube 265, over the anvil 261, around rolls 267 and finally between a roll 315 on the spring-pressed lever 317 and a roll 313 to a roll 305. The roll 313 is driven by a free-wheel device and a rod 347 which is adjustably secured at its upper end in a groove 353 in an arm 91 on the shaft 89. When there is no work feed, the rod 347 is coupled to a grooved arm 359 which is driven from the cam lever 155, Fig. 3, through an arm 367, a rod 365 and an arm 363. The upper roll 305 is driven by gears 377, 379, the latter having a friction drive. The rolls 295, 305 are held in position by a plunger 309 and may be interchanged. The punchings are removed from the hollow block 99 through a tube 137, 139 to a chamber 407 which is connected by a tube 405 to a pump comprising a leather flap which is oscillated in a casing by a spring and a lever 421 controlled by a cam 423 driven by the shaft of the gear 379. Specifications 15555 /08, [Class 31], 208,240, 254,780, 338,193, [all in Class 31 (i)], and 435,408, [Group XXXIV], are referred to.