Patent GB-339739-A (GB)
Title: Improvements in or relating to shoe-bottom pressing means
IPC: A43D25/06
Filed: 1929-07-24
Abstract: 339,739. United Shoe Machinery Corporation, (Assignees of Finn, S. J.). April 3,1929, [Convention date]. Sole-laying.-In a shoe bottom pressing machine, sole holding means are provided which engage the sole and hold it in the position on the pad in which it has been placed by the operator. Shoe locating means are mounted on the sole holding means for ensuring that the shoe is properly positioned relatively to the sole. Means are provided for applying preliminary pressure, and other means for applying further pressure.. A dilatable pressure pad is used, the sole engaging face of which is adjustably restricted in accordance with the size of the shoe. Preferably, the pad contains water and comprises a rubber vessel, having reinforcements of fabric or metal, or both, at parts of its sole engaging surface. The final pressure, is produced by distorting the vessel at a part other than its sole-engaging face. The dilatable pad is contained in a box 28, Fig. 1, on the table 20 of the machine. To the ends of the table are secured vertical plates 36, 40 to which are hinged, and adjustably supported by struts, plates on which the sole and shoe gauges slide. Fig. 8 is an exploded view of the fore-part mechanism. Sole edge engaging members 96, 98 for the ball and tip portions of the sole, respectively, are adjustably pivoted to levers 70 - - 73 pivoted at 74 and 75 in top and bottom plates carried by the slide. Pins at the outer ends of these levers engage slots in plates 80, 82 provided with guiding slots engaging a pin 90 about which the plates can pivot, if necessary. A toe-end engaging member 114, formed with sole and shoe contacting portions 118, 116, respectively, is guided by ribs 120 on a cap plate 126 and formed with teeth engaged by pawls 130 provided with tails co-operating with pins 136 on the levers 70, 71. All this mechanism is carried by blocks 58 pivoted to ears on a slide 53 guided to move longitudinally of the shoe. Rollers 162, supporting the gauging mechanism, rest on cam tracks to allow the shoe-engaging members to drop to the surface of the pad as the slide is moved inwardly. The members 80, 82, 114 are urged toward the shoe by light springs secured to the slide, this being connected to chains secured at their other ends to a weight 166, Fig. 2, and a treadle 198, respectively. the treadle withdrawing the slide from the shoe and being then retained by a latch 200, Fig. 1. Similar mechanism is provided for the heel end of the sole, except that only, one pair of side gauges is necessary. A weight 262 urges this mechanism towards the shoe against the pull of a chain also connected to the treadle 198, so that this treadle retracts both the fore and rear mechanism. For holding the shoe down in contact with the pad, a pair of yokes 280, 294 are pivoted to the pad box, and provided with members engaging the rear end of the last and toe portion of the shoe, respectively. The toe rest comprises a pad of leather or felt secured, with some play, to the lower end of a plunger 290, Fig. 3, urged upwardly by a spring 300 but provided with teeth co-operating with a pawl 304 to hold the plunger in a lower position. The heel end presser has a similarly-acting plunger, and the yokes co-operate with devices mounted on a pair of arms 310, Fig. 5, pivoted to the table. When the shoe has been positioned, these arms are swung inwardly, when plungers 320, Fig. 1, align with the plungers 284, 290. The former plungers may be depressed by cams at the ends of levers 334, secured to sleeves surrounding the plungers, the sleeves having teeth co-operating with pawls 340, Fig. 3, this construction allowing repeated operation of the levers 334, the pawls 304, 340 holding the respective lower plunger and upper sleeve to maintain each step of pressure as this is built up by further actuation of the levers 334. The arms 310 have lugs to swing the yokes inwardly with them if these yokes have not been first swung into operative position, and each moves with an arm 344, Fig. 5, pivoted to the table, for releasing the pawls 340 as the arms are swung outwardly. The pad box is positioned on the table by guides 358, 360 and vertical bars 362, and is held down by undercut members 352, 356. The box contains a rubber Fig. 17, formed by vulcanizing over a frangible core, which core may be afterwards removed through an aperture 468, subsequently closed by a plate. The sole engaging surface of the pad has an embedded, canvas reinforcement 478, and, at the toe and heel portions, embedded plates of spring steel, e.g., 0.02 of an inch thick. Apertures in the plates receive rubber during vulcanization, and the toe plate is slit longitudinally and transversely to increase its flexibility. In a modification, this plate is slit transversely only. To restrict the shoe-engaging opening in accordance with length of shoe, a plate 392, Fig. 12. with depending outer portions, may be slid longitudinally of the pad box 30 to restrict dilation of the pad. To provide the final sole-laying pressure, the bottom of the pad is distorted by a member 400 engaged by a plunger 368, Fig. 2, operated by multiplying levers 370, 376, 382 on the last of which is hung a weight 388. This weight is raised, when desired, by a chain secured to a treadle 436, Fig. 1, provided with a pivoted retaining catch 444, which may be released by a latch 450. A number of sole pad units are provided, so that shoes may be set aside with the soles under pressure while the cement sets. To maintain the member 400 in its raised position when the unit is removed from the machine, the member has a tapering portion engaged by levers 404, 406, Fig. 12, pivoted to the bottom of the box and urged together by a spring 408. To lock the levers against retraction, their outer ends are connected by a link 40, Fig. 11, pivoted to the lever 404 and to a link 414 carrying a slide normally pressed outwardly by a spring but provided with ratchet teeth and a pawl for holding it in any inward position. The inner end of the slide co-operates with two flats at the end of the lever 406, the flats being separated by an incline. The construction is such that the slide may be pushed inwardly, by the operator's thumb, until it contacts with the fiat at the end of the lever. The link 414 may then be pushed towards the box, when the end of the slide rides up on to the second flat, and clamps the member 400. The gauges 95, 96, Fig. 8, engaging the shoe and sole, respectively, are adjusted relatively by an eccentric pin on a head provided with a pointer 112 for indicating the position of the pin. For quick adjustment, when the machine is required to deal with right and left shoes respectively, pinions may be provided on these heads, gearing with racks pivoted to levers geared together, so that the gauges on the two sides may be simultaneously adjusted by a movement of one lever. In operation, a sole to which pyroxylin cement has been applied, allowed to dry, and then cut with a solvent, is placed on the dilatable pad. The operator presses on the waist portion of the sole, and releases the latch 200, whereupon the weights 166, 262 advance the sole and shoe gauge slides to a limit determined by stops. Following this stoppage, the end gauges advance further to contact with the sole and the side gauges swing inwardly, their cam plates, if necessary, swinging laterally until all the members have " found " the sole. If necessary, the operator can then shift either or both ends of the. sole transversely by applying lateral pressure to any of the gauges. The shoe is then positioned, the levers 334 grasped, and the arms 310 swung up to vertical position. The, operator may depress the levers to bring the plungers and shoe all into contact and then swing the levers forwardly, repeating this operation if desired until a pressure of say 20 pounds per square inch is shown by the gauge 476. The levers 334 are then thrown back and the arms 310 allowed to fall outwardly. The operator then trips the latch 450. As the weight 338 descends, a lug 458, Fig. 1, on the lever 382 compresses a spring 462 depressing the treadle 198 withdrawing the gauging members, the weights 166, 262 acting in opposition to the heavier weight 388. During withdrawal of the gauges, they are centralized by pins engaging bell-mouthed notches. The operator then fully depresses the treadle 198, allowing the whole of the weight 388 to be applied to the plunger 968, the pressure then rising to about 60 lb. He then operates the slide 416 to lock the member 400, and depresses the treadle 436 to withdraw the plunger 368 and raise the weight 388. The pad box with work under pressure is then removed and a fresh pad box may be substituted to receive the next shoe.