Patent GB-191505096-A (GB)
Title: Improvements in or relating to Machines for Cutting Heel Lifts or other Parts of Boots and Shoes.
IPC: A43D27/00
Filed: 1915-04-01
Abstract: 5096. British United Shoe Machinery Co., [United Shoe Machinery Co.]. April 1. Cutting-out apparatus.-In a machine of the kind described in Specification 20,118/14 for cutting-cut heel lifts or similar articles forming parts of boots and shoes from sheet or strip material, such as leather, leather-board, &c., auxiliary feedmeans are provided in combination with the main feed-means, such auxiliary devices being normally inoperative to feed the material, but automatically rendered operative to advance the end of a piece of material from the field of operation of the main feed-means towards the dieing - out position The material is supported by a table 172 and is fed forward by toothed rolls 36, 38 which are driven intermittingly from gear-wheel 52 meshing with a wheel 48 and so with wheels 50, 44, 46. In order to permit the feeding of stock of different thicknesses, the shafts 40, 42 of the rolls 36, 38 are carried, by arms 68, 60 turning about the axes of the wheels 48, 50, and are connected by links 72, 74 to the end of a spring- controlled rod 78 fitted with adjuating-nute 86, 84. The means for advancing the end of the strip comprise one or more fingers 182, Fig. 2, carried by a lever 192 and reciprocated by a link 198 and rocking arm 200 from an eccentric or cam 216, Fig. 1, driven from the main shaft 10. The fingers are received in slots 184, Fig. 4, in the feed-rolls and normally bear upon the underside of the stock, the slots in the lower rolls being sufficiently deep to accommodate the fingers when depressed by the stock against the action of a spring 186. In order that, at the commencement of the operation, the leading end of the stock may be first fed through the distance which separates the feed-rolls from the inner or front edge of the die, means may be provided to prevent the introduction of stock until the feed-mechanism is in the correct position for effecting such a feed, and such means may comprise a shouldered gate 138 which is yieldingly depressed by a spring 158, Fig. 5, and is positively and intermittingly raised by the action of an adjustable cam 156 upon a roller 154 and link-work 152, 148, 144. The gate has a foot 142, Fig. 4, intended to guide and control the stock as it is being fed, and a member 166, pressed up against the underside of the table by a spring 176 and received at its forward end by a notch 168 in a stripper bar 170, tends to lift the front edge of the stock above the stripper bar and the edge of the die. An edge guide 222 upon the table, an overhanging flange 224, and an adjustable guard 226 are provided to guide the stock and to ensure the positioning of the leading end against the shoulder of the gate. As it is fed over the die, the material is guided at one edge by a member 232 adjustably mounted upon a ydeldinglysupported slide 234, and as this slide is depressed during the cutting stroke of the vertically reciprocating block 20, it is caused to move laterally by the action of a link 244, so that the member 232 passes down over the inclined outer surface of the die. The other edge of the material is guided by a bar 288 mounted upon an arc-shaped slide 290 supported by a spring 300. The bar 170 is mounted upon the vertically yieldable carrier 236 of the slide 234, and provision is made for the adjustment of the bar towards and away from the die. When sheet stock is employed, it is cut into strips as it is fed, and for this purpose, overlapping corrugated cutting-disks 274, 276 are provided upon the shafts of the feed-rolls, a spacing-member 278 being arranged on each of these shafts, so that the feed-rolls may be lengthened or a wider strip cut off. An auxiliary table 282 is used for supporting the stock when in the form of a sheet. The gear-wheel 52 is driven by a rollertype of one-way clutch, and in order that the wheel may slip in the event of interference with the feeding operation, the cage carrying the rollers and forming the inner and driven member of the clutch is provided with a plate 112 recessed to receive balls, which are also partly located in the opposed face of the gearwheel, this wheel being mounted on a shaft capable of longitudinal motion against the action of a spring. An indicator is provided, so that the amount of feed can be readily adjusted to the size of the die. The cut-out blanks pass down through the die and an opening in the machine frame to a sifting-shoot 26, which is pivotally mounted at one end upon a rod 304 and connected by a spring 314 and rod 312 at its other end to an adjustable wristpin actuated from the main shaft 10. The cutting-edge of the die is preferably received in a groove previously formed in the block 20 by the die itself, the block being so adjusted that, in its downward movement, it stops when the die edge is a short distance from the bottom of the groove. To provide for the accurate location of the block 20 in the machine so that interchangeable dies and blocks may be employed, the block is carried upon a dovetailed slide received in a corresponding guideway in the carrier 18, a gib 356 on one side of the guideway being pressed into engagement with the slide by set-screws 357, and a spring-pressed pin 358 being engaged with a socket in the slide. The die 22 is mounted in a carrier 24 shouldered on its underside to fit a circular opening in the machine frame and retained in position by the engagement of one of its holes 394, Fig. 15,. with an upstanding pin 383 upon the frame and a clamping-yoke 384 bearing upon a bevelled surface 382* upon the carrier. The die is held by a fixed abutment 370 and an adjustable clamp member 372, the correct location in the machine being ensured by a pin 390 passing through one or other of the two openings 392, 394' in the abutment 370 and into an opening in the breast end of the die. When the die has a straight breast edge, the die is preferably so placed in the machine that this edge coincides substantially with one of the straight sides of the strip; if the die hits a curved breast edge, this edge may stand across the line of feed and face either one way or in the directly opposite direction.