Patent GB-215420-A (GB)
Title: Improvements in or relating to the manufacture of shoes
IPC: A43D29/00
Filed: 1923-02-01
Abstract: 215,420. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Feb. 1, 1923. Addition to 206,176. Heels, machines for; trimming.-A machine for performing automatically successive operations on a shoe bottom part is adapted to produce an unlimited number of standardised parts by the co-operation of the same positioning surfaces on the parts with similar surfaces formed on each of the operating mechanisms. As described in a machine for successively trimming and compressing a heel blank of the kind described in the parent Specification, i.e. a blank 24 having jigholes 25 and a short lift forming a shoulder 26, the blanks are fed singly from a magazine 12 over a table 48 b a slide 30 operated yieldingly by an adjustable linkage 60, 76 from a cam 80. The magazine, Fig. 9, is closed by two gate members 34, 36 of unequal length pivoted on a rod 38 and held in position by separate springs. The blank is positioned by the slide with its shoulder 26 engaging a gauge 54 on the table 48, and is seized by one of four sets of arms 90 forming a rotary carrier 14. The arms 90 carry spring-held and pivoted friction blocks 92 and are urged together by springs 100. The arms are pivoted on a circular plate 104, Fig. 7, and have extensions 106 engaging with racks 108 by which the arms are opened. Slots in the racks 108 receive the upper ends of levers 110 pivoted on a sleeve 114, Fig. 6, which supports the carrier, the lower ends of the levers being formed with cam projections 120 which are engaged by the wedge-shaped edge of a sliding collar 116 to spread the levers. The collar 116 is operated through a spring-pressed block 124 and pin 126 by a rod 122, linkage 134, 136, and a shaft 130 carrying a roll 140 running in a cam slot in a reciprocable cross head 142. Means for rotating the carrier step-by-step comprise a hollow shaft 125, to which the collar 114 is pinned, journaled in bearings 150, 155 and having at its upper end a worm-gear 156 in mesh with a worm 158 fast to a sleeve 160, Fig. 2, movable lengthwise of a shaft 162 but constrained to rotate with it by the engagement of forks 164 with studs 166 on a collar 168 fast on the shaft 162. As the shaft 162 rotates, the engagement of a cam slot 176 on the sleeve 160 with a fixed roll 178 causes the sleeve to move lengthwise of the shaft so that the gear worm 158 rotates the gear 156 and shaft 125. Another part of the cam slot 176 has the same pitch as that of the worm, so that when the sleeve is moving in the opposite direction there is no movement of the worm gear, which is locked in position by its engagement with the teeth on the worm. It is at these times that the collar 116 is operated to open and close the arms 90 and that the trimming and compressing instrumentalities operate. Further to lock the carrier in position at these times, a key in the reciprocable cross-head is adapted to enter a notch in a plate on the sleeve 114. The shaft 162 is rotated through gearing 328, 326, 324, and 322 from a counter shaft 320. For trimming the peripheral portions of the blank, a tubular die 16, Fig. 4, fast on the cross head 142 is provided. Working within the die is a blank-positioning and ejecting plate 204 having jig-pins 202 and an abutment to'engage the corresponding surfaces on the blank. The plate 204 is mounted on a rod 216 vertically slidable in a bearing on the bracket supporting the trimming die and constrained to move therewith by the pressure of a spring-pressed friction pad 220 against the rod 216 until the resistance to movement of the plate 204 overcomes this friction. Fixed on the lower end of the rod 216 is a latch 228. Fig. 2, adapted to engage a lip on a bearing 238 for the rod. In operation, the plate 204 and die 16 move up together with the cross head 142 until the jig pins 202 enter the holes in the blank and position the latter properly against a cutting block, after which the die rises further to trim the blank. The die and plate then descend together until the latch 228 engages the lip, when the plate 204 is held from movement until the carrier 14 again grips the blank. At this moment, a stud 234 fixed on the cross-head 142 engages the tail of the latch, tripping the latter and again allowing the plate to descend with the die. The compressing means comprise a heel seat die 18, Fig. 3, mounted on the cross head 142 and formed with jig pins 208, 210, and an abutment 212, a mould 22 slightly less in size than the trimmed blank, and a tread die 20. The die 20 is operated through linkage 290, 274, a yielding connection 272, 280, linkage 264, 266, and cam roll 268 and cam 80 so that it is at the mouth of the mould 22 when the die 18 is seating the blank on its positioning surfaces, and then rises with it into the mould. The die 20 subsequently serves as an ejector. From this station the blank is taken by the carrier to a discharge shoot. The main driving shaft 312 of the machine is operated from a motor 300, and the shaft 312 operates, through a link 316, a toggle 314, which raises and lowers the cross head 142. The table 48, ejector plate 204, trimming die 16, compressing dies 18, 20, and mould 22 are all arranged at a slight angle to the horizontal, say at an angle of 4‹, so that a blank is maintained in the same relative position to all the operating mechanisms during its path through the machine: and the jigging means ensure the production of standardized parts. In operation, each time the carrier 14 comes to rest, a heel blank is taken up, trimmed, compressed, or discharged at the corresponding station in the machine. Specification 215,676 also is referred to.