Patent GB-687861-A (GB)
Title: Improvements in or relating to methods of, and machines for, folding the margins of workpieces
IPC: C14B11/00
Filed: 1950-04-22
Abstract: 687,861. Folding and finishing edges of sheet material. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). April 20, 1951. [April 22, 1950] No. 9944/50. Class 42 (i) A folding machine for e.g. skived margins of leather workpieces includes means arranged to move a workpiece through the machine, means to apply cement to a margin of the workpiece, means for acting upon the cement, after application, to render it tacky more speedily than would normally be the case if it were merely exposed to the atmosphere, or to apply workshrinking heat to the margin, and means arranged to fold or press the margin back upon itself. The cement may be applied by a nozzle having an arrangement for supplying a cooling medium thereto, to prevent it from becoming undesirably heated by the means for heating the margin. The machine has a work-table 10, and an overhanging arm 50. A turning post 22 is mounted on the table 10, and a feedwheel 12, cement-applying nozzle 28 and electrically-heated rod 30 are carried by the arm 50. The work-piece is fed by the feed wheel 12, which co-operates with a roller mounted on anti-friction bearings in the table, under the nozzle 28, then under the heated rod 30, which causes the solvent in the cement to evaporate, rendering the latter tacky, then past the turning post 22, which folds the edge. The folded edge is then pressed between a hammer 32 and anvil 34 which are arranged to move in the direction of feed during this operation. The feed wheel 12 is driven from a shaft 38 through skew gears 44, 46, shaft 48, skew gears 52, shaft 54, worm gears 56, 58, flexible shaft 64, and bevel gears 66, 72. The gear 72 is formed on the side of the feed wheel 12, and is journalled on a bracket 70 mounted on a sleeve 68, which is secured to an arm 74, which is connected to a block 76 in turn connected to an arm clamped to a rod 80, which is vertically slidable in the overhanging arm 50, the connections permitting lateral and forward adjustment. An arm 88 is secured to the rod 80, and is urged downwardly by a spring 86, the tension of which is adjustable by a knurled nut 94. The feed wheel assembly may be lifted by operating a finger piece on a lever which acts on a member secured to the rod 80. The nozzle 28 comprises a tube threaded into a block 110 mounted on a lever 112 which is pivoted to a lug 116 on the holder for the heated iron 30, the lever 112 being so biased by a tension spring 120 as to urge the nozzle downwards. When not in use, the nozzle is raised by a strong spring 140 acting on a collar 142 on a rod 138 pivoted to a lever 132, which acts through link 130 and lever 126 on one end of the lever 112. The lower end of rod 138 is connected to a treadle, depression of which permits downward movement of the nozzle; at the same time a rotary valve in the latter is opened by a pin 156 secured thereto, which engages an adjustable cam plate 160, permitting flow of cement from a pot 220 to the nozzle. A gear pump, fitted with a by-pass valve, and driven from the drive shaft 38 through the shaft 48, a worm drive, shaft 280, pulleys 278, 274, belt 276 and shaft 272, is mounted below the pot 220 for forwarding the cement. A tube 164 surrounds the nozzle 28, but is spaced therefrom, cooling air from a tube 166 being passed through the space. The iron 30 consists of a U-shaped piece of a suitable alloy, the legs being connected through conductors 170 and wires 172 to a source of electric current. The holder 118 for the iron is mounted a dovetail member 174 permitting forward and rearward adjustment on a block 176 which is vertically adjustable by a knob 190 on a transversely adjustable plate 186, mounted on the arm 50, and adjusted by a knob 214. The hammer 32 has a depending stem 300 which is secured to one arm of a bell-crank lever 306, pivoted on a pin 308 secured to a side block 312 which is reciprocated in a direction parallel to the feed of the work, sliding on a wear plate 314 on a block 316 secured to the base of the machine. The anvil 34 is adjustably secured to the side block 312. The hammer 32 is oscillated vertically by connecting the arm 348 of the bell crank lever 306 through a rod 344, to a slide 336 on which is a pin 334 carrying a roller following a groove in a cam 330 on the main shaft 38. The rod 344 is provided with ball-and-socket joints at both ends, provision being made for limited longitudinal movement through the ball mounted between the arm 348 of the lever 306 and a plate 350 secured thereto, against the pressure of a spring 360. A stub shaft 374 is mounted with adjustable eccentricity on an enlarged portion of the shaft 38, and has mounted on it a bushing surrounded by an eccentric strap 386, to which is connected an arm 388, pivoted on a transverse shaft 392 in lugs on the base of the machine. The upper end of the arm 388 carries a transverse shaft 394 on which is pivoted the outer end of the slide block 312, which, together with the hammer and anvil which it carries, is thus given a reciprocating motion. The position of the cam 330 is so arranged that the hammer is lowered to grip the work during the forward movement. Specification 469,884, is referred to.