Patent GB-519115-A (GB)
Title: Improvements in or relating to apparatus adapted for use in assembling boot or shoe bottom units
IPC: A43D35/00
Filed: 1938-09-15
Abstract: 519,115. Assembling shoe-bottom units. BRITISH UNITED SHOE MACHINERY CO., Ltd. Sept. 15, 1938, No. 26906. Convention date, Sept. 16, 1937. Addition to 465,807. [Class 17(i)] The machine described in the parent Specification for assembling an insole, a loose shank stiffener and a mouldable reinforcing piece for the heel seat and shank of the insole, is modified. A twin machine is provided, so that a unit may be left under pressure for setting of adhesive previously applied while the other work-piece is changed. The toe gauges of the twin mechahisms are connected for simultaneous adjustment. The shank stiffener is positioned by members locating its opposite ends. The upper moulding member is first swung laterally over the fixed mould and then depressed, this movement being produced by hydraulic mechanism. Ejecting mechanism delivers the finished work-piece to a shoot. Safety means require both hands of the operator to cause the closure of the moulds. Each of the toe gauges 26, Fig. 3, is carried by a slide 52, and the two slides are connected by a link 60 guided by slide rods 62 and side plates 66. The gauges are adjusted simultaneously by a double ended treadle 103 moving with an arm 115, Fig. 3a, to which pawls 117, 119 are pivoted at 113, the pawls carrying teeth 121 co-operating with teeth 123 on a sector pivoted at 72, Fig. 3, and formed with a curved slot 90 along which may be adjusted one end of a link 80 the other end of which is also adjustable along a slot 100 in the link 60. The treadle 103 is centralised by a spring 107, Fig. 3a, and the pawls are urged against a step 125 on the arm 115 by springs 127. A retaining pawl 129 is provided. To adjust the toe-gauges in one direction or the other the respective end of the treadle is tapped, the treadle being returned by the centralising spring. The sector 70 and both ends of the link 80 are provided with pointers and scales to facilitate adjustment for various sizes and styles. The insole is centralised by gauges 30, 32, Fig. 3, as described in the parent Specification. Gauge members for the ends of the shank stiffener are brought into operative position by depression of a treadle 110, Fig. 4, connected by links 172, 162 to a vertically sliding block 160, Fig. 10, provided with a pin 158 and a pivoted arm 226 carrying a pawl 224. A gauge member 34 for the forward end of the stiffener and a hold-down 38 are slidably carried in a casing 114 secured to a carrier 219 pivoted at 206 to a vertically sliding block 208 having a cross bar 220 formed with a notch co-operating with the pawl 224. A retaining latch 232 is also provided. The pin 158 engages a slot in a bell-crank lever 148 carrying a pin 146 co-operating with a hook 144 on a link actuating an arm 126 carrying a gauge 36 at the end of a spring 120 secured to a member pivoted at the upper end of the arm 126 and having an arm 136 linked to a fixed arm 130. The arm 126 is pivoted at 128 and extended to co-operate with stops 190, 192, the arm being held against either stop by a spring 180 once it has been moved over its central position. On the first descent of the treadle, the pawl 224 depresses the gauge 34 to contact with the sole and position the forward end of the stiffener, the gauge being retained in its lower position by the latch 232. Simultaneously the gauge 36 is swung to the other end of the stiffener, the link 132 restraining the gauge to substantially a straight line motion. The shank stiffener having been positioned, the treadle is depressed a second time. The pawl 224 on its second descent engages the top of the bar 220, bringing the hold-down 38 on to the stiffener. The pin 206 engages a lever 200 causing an arm 212 thereon to release the hook 144 and the end of the lever to engage a roll 215 to swing the arm 126 and gauge 36 to out-of-the way position. The reinforcing layer of the shoe bottom unit is then positioned between the gauges 30, 32 and the upper mould 40 is caused to descend. As the upper mould descends a roll 42 thereon engages a cam 44, Fig. 10, causing rolls 256 on an arm 250 integral with the cam to release the members 224, 232 and allow the carrier 219 to rise. A shoulder 258 on the cam swings the carrier about its pivot 206 to remove the members 34, 38 from between the moulds. The mould is carried by an overhanging arm 41, Fig. 2, provided with a cam 546 co-operating with a fixed roll 544 for swinging the upper mould over the lower mould before they approach one another. The arm 41 is pivoted to a piston 528, Fig. 4, working in a small cylinder 526, supplied with oil under pressure by a gear pump 517, driven by an electric motor 510. The piston 528 is connected to a piston 532 of larger diameter, working in a cylinder 534. When the piston 528 nears its lower position, it uncovers a valve 550, admitting the high pressure liquid to the cylinder 534 and thus greatly increasing the pressure for the actual moulding operation. The machine is provided with safety means requiring both hands of the operator for bring- ing the moulds together. The starting lever 522, Fig. 2, is locked unless a second handle, under the press to be closed, is held toward the starting lever. The two piston rods are connected by a lever, so that when one pair of moulds are closing the other pair are opening. As the upper mould descends, a plunger 280, Fig. 7, secured thereto, depresses the gauges 30, 32 which slide down the sides of the lower mould. The lower mould houses an ejecting plunger 390 which raises the work-piece as the moulds separate. The plunger is resiliently actuated by a lever 394 having an arm 398 to which is pivoted an arm 402 bearing a cam-roll co-operating with a cam 410 on the arm 41. In line with the ejector is a plunger 416, Fig. 5, which cooperates with the plunger 390 to hold the workpiece between them. The upper plunger is urged downwardly by a light spring 418 and a heavy spring 420, the latter coming into operation when the moulds make contact with the work, to ensure that the pressure at this point of the work-piece is equal to that on the remainder. When the work-piece has been raised and is held by the two plungers ejecting members 46a, 48a knock it into a shoot 50, Fig. 3. These members are carried by rods 46, 48, Fig. 5, actuated by an arm 432, Fig. 2, moving with an arm 438 urged clockwise by a spring 458 but in operative direction by a latch 440 as this rises past a fixed abutment 446 in the upward movement of the mould. The moulds shown in Figs. 3 and 5 are used, respectively, when the stiffener is to be below or above the insole. In order that the fore-part may be correspondingly adapted, the slide 52 can take either of the positions shown in these figures. The heads of pins carried by the guide of the slide are adjustable along arc-shaped grooves near their inner ends, the slide being retained in either position by a spring plunger engaging one of two recesses.