Patent GB-605376-A (GB)
Title: Improvements in and relating to the multiple cutting of sheet material along curvingpattern lines
IPC: C14B5/00
Filed: 1945-12-20
Abstract: 605,376. Cutting-machines for leather &c. KISTLER, LESH, & CO., Inc. Dec. 20, 1945, No. 34588. Convention date, Dec. 29, 1944. [Class 31 (i)] [Also in Group XVI] A machine for the multiple cutting of sheet material along curving pattern lines, which is especially appliable for the cutting of boot &c. block soles to form a series of alternate right and left soles, is constructed with a cutting-roller 10 fitted with sinuous blades 11 held in place by means of shaped positioning collars 12, the blades acting up on a strip W, Fig. 5, which is advanced side-wise after being registered longitudinally by means of spring pins 37 mounted in the cutting-roller 10, and laterally by means of an adjustable guide 200 arranged above the feed table 35 which enables the strip W to be placed as shown in Fig. 33, so as to enable the first sole SR to be cut with a minimum of waste. The blades 11 are shaped to cut alternate right soles SR and left soles SL as shown in Fig. 33, and the machine may be set to cut soles of various sizes and numbers. The roller 10 is held above the cutting-bed roller 20 while the strip is inserted, and the roller is mounted in adjustable sliding bearings which are raised by a cam 45 so as to cause the blades 11 to penetrate the strip prior to the feed of the strip by the cutting roller when the rollers 10, 20 are pressed together. The cam 45 is driven-from a motor 6 by reduction gearing 7, and a one-revolution clutch which is engaged by depression of a lever 63, Fig. 5, by depression of a pedal 75. After a quarter revolution of the cam shaft 40 a further cam 97 actuates a spring-controlled striker rod 100 which throws in another one-revolution clutch which causes one complete revolution of the cutting-roller 10 with consequent cutting of a series of soles the lefts and rights of which are delivered into separate piles by means of shoots 104, 104<1> arranged at different levels to which the soles are directed by means of stripping-devices. Each set of shoots 104, 104<1>, comprises a member formed with sides 104 104<1> connected by crossed links as 107<1> 108<1>, Fig. 1, which form parallel linkages enabling hoppers of different sizes to be formed as the whole system is expanded or contracted by a sliding movement. When in closed position the maximum number of narrow shoots is in alignment with the cutting rollers, and when expanded to form larger shoots some of the shoots extend to inactive position as shown at the right in Fig. 1. The shaft 40 stops at the end of a complete revolution and the roller 20 is lowered out of contact with the roller 10. The roller 10 then completes its revolution and the parts return to the position shown in Fig. 5 in which the knives 11 press into the strip W and are ready to perform a further cutting operation. The cutting- roller 10 is formed of outer flanges 151, 152, Figs. 1, 18, and sectional parts 160, 170, Fig. 15, and a circumferentially adjustable section 165, the parts 160 and 165 being formed with grooves 162, 168 for receiving projections 185 on clamping bars 180 to which bent ends 12a, 12b of the collars 12 are secured by means of a holding-bar 175, Fig. 14, and clamping screws 182. The holding- bar 175 is formed with slots 178 through which the screws 182 pass, thus permitting the bar to be adapted to collars of different widths. The collars may be secured to the members 175, 180, prior to attachment to the cylinder 10, and the assembled collars may be secured to the grooves 162, 168 referred to by circumferential adjustment of the section 165 by means of cams 190, Fig. 15, the axis of which are radial of the roller 10. The cams 190 are operable by a wrench inserted into a non-round socket 196 opening outwardly thus permitting change of collars &c. The cutting-blades 11 can be changed at any time by backing out the screws 182 to free one or more collars from the corresponding blades. One form of blade 11 is shown in Fig. 31, and it is formed of steel and is provided with bent feet 11a<2> at each side which are separated by grooves 11a<1> of sufficient width to permit of the bending of the blade to the required curvatures. The parts 11a<2> on each side of the blades are relatively staggered. The cutting-edges of the knives may be formed by grinding away one or both sides of the edges, and at different inclinations on opposite sides if desired. The knives may provided with bent feet on one side only, and they are shaped so that the curved cut lines are relatively reversed lengthwise thereof, and alternate cut lines are mutually parallel. The means for determining the shape of the positioning collars 12 is described since this shape is not the exact equivalent of the cut articles, but is varied so as to cause the arcuate radial blades 11 to be curved laterally along a line at the inner margin thereof determined by projection of the desired article pattern from the cylindrical surface at the blade outer edge inward on to a concentric cylindrical surface adjacently parallel to the inner margin of the blade. U.S.A. Specifications 588,964, 803,710 and 1,191,344 are referred to.