Patent GB-920091-A (GB)
Title: Improvements in apparatus for lasting covering materials over supports or forms
IPC: A43D25/053
Filed: 1959-05-04
Abstract: A lasting machine comprises a pair of oppositely rotating rolls 328 and 314, 712 and 714, or 14 and 16, for gripping the margin of a flexible covering and applying both feeding and drafting stresses thereto to draw the covering over a last or form, a stationary blade 100 situated close to the rolls and serving to bond the margin inwardly and downwardly toward the surface of a shoe or a form as it is released by the rolls, a movable wiper 420 or 512 which then engages the margin to press it against the said surface, means for attaching the margin to the surface, a fluid pressure operated motor to hold the rolls engaged with the margin at a predetermined pressure and to separate the rolls when required, and a device for changing said pressure at will.  The roll 328 or 712, say, is urged towards its co-operating roll 314 or 714 by air supplied, via a pressure regulator R with adjustable valve V2, to one end of a <PICT:0920091/III/1> <PICT:0920091/III/2> <PICT:0920091/III/3> <PICT:0920091/III/4> <PICT:0920091/III/5> <PICT:0920091/III/6> <PICT:0920091/III/7> <PICT:0920091/III/8> cylinder 336, or 736, the minimum distance between the rolls being determined by a screw 352 co-operating with an abutment 358 on the slide 322 carrying the roll 328 and adjustable through bevel gears 348, 350 on turning a knob 360.  The rolls may be separated by diverting the air to the other end of the cylinder, either by the action of interconnected valves V, V2 operated by a foot pedal, or automatically by a double acting valve V following the regulator and adjustable valve and shifted by a solenoid R2, the switch S of which is controlled by a diaphragm d, collapsed or not according as to whether work is or is not still interposed between a pipe 746 supplying compressed air and a pipe 744 connected to the diaphragm chamber.  The switch also operates a valve solenoid, or a motor driven pump M controlling supply of an adhesive from a container G.  The wiper support 424 is mounted on the machine frame for tilting movement about a bolt 426 to a limit determined by a pin and slot 432, 430 and adjusting screw 436. The wiper bearing block 422 is secured to a piston 456 slidable in a bore 442 in the support 424, between limits imposed by screws 464, 466, which co-operate with a pin 462 protruding from the piston through a slot 460 in the support.  An eccentric 474 is adjustably fastened to the block 422 and its upper arm passes through a guide 482 and bears against the lower face of a second piston 468 slidable in a second bore 444 in the support.  The slot 460 is made sufficiently wider than the pin 462 to permit some rotation of the piston 456 about its axis, so that the wiper 420 may be moved to some extent in a horizontal plane.  A spring 488 bears on the slide 482, which is slidable horizontally in a recess 486.  Air under pressure, to force the pistons downwardly, is supplied via an adjustable regulator PR. The regulator and a relief valve V3 maintain constant pressure if the pistons are forced upwardly.  The wiper bears an external rib and may house an electric heater 538 embodying a thermostat and be driven via a shaft 566 and flexible coupling 565.  A block 662 of adhesive can slide down inclined tubes 622 towards a heater 624 embodying a thermostat.  Melted adhesive drops through an opening 636 into a chamber 616 and thence into a base 610, whence it passes by way of a spout 614 to a nozzle.  The heater circuit includes a switch 640 operated by a float 642.  A reciprocating cutter 25, to slash the margin, may be mounted on the blade 100, which may be attached to a slide to be rendered operative and inoperative in time with the rolls.  A stapling device may replace the adhesive dispensing apparatus.  Specification 824,564 is referred to.