Patent GB-324367-A (GB)
Title: Improvements in or relating to boot or shoe inseam trimming machines
IPC: A43D49/00
Filed: 1928-10-24
Abstract: 324,367. British United Shoe Machinery Co., Ltd., United Shoe Machinery Corporation). Oct. 24, 1928. Trimming; welts, machines for. - An inseam trimming machine is provided with a channel guide, a crease guide, and a vibrating beater cooperating with the crease guide to beat out the welt. The shoe is mounted on a support mechanically moved to present the supported shoe to the operating mechanism, the channel and crease guides maintaining the work in proper position. Preferably, the mechanism moving the work support compensates for surface and edge curvature of the shoe bottom. The jack and its actuating and controlling mechanism is of the kind described in Specifications 120,924 and 160,274, [both in Class 89 (iii), Nailing &c.] ; 215,772 and 241,235. The knife 8, Fig. 1, is mounted on a sleeve 16, on a shaft 18 secured in an adjustable carriage 20, and is driven by bevel gearing from a main shaft 22. The channel guide 10, Figs. 2 and 7, comprises a roll, driven to feed the work, and mounted in a hanger 36 pivoted at 38. The position of the roll is adjusted by a nut 52 engaging a bolt pivoted to the frame. The crease guide 12 is formed on the end of a lever pivoted at 54 and adjusted about the pivot by an eccentric pin on the end of a screw 58 engaging a bolt formed with a slot co-operating with the inner end of the lever, lock nuts 56 being provided for the bolt. The welt-beating hammer 14 is pivoted at 62 and connected by a short link 64 with a lever oscillated by a three-point cam 70 on the shaft 22. A grinding wheel 71 is mounted on a shaft 72 slightly inclined downwardly and rearwardly and passing through a sleeve 78 integral with the poles of the cylindrical field magnet frame of a small induction motor. The armature is mounted on the shaft 72, the construction being such that, normally, the shaft 72 slides to the left under the action of gravity, removing the grinding wheel from the rotary cutter, but, when the motor is working, the armature centres itself in the magnetic field and advances the grinding wheel into yielding contact with the cutter. To compensate for wear, the field magnet frame is adjustable by a rack 88 gearing with a segment 90 connected to a handlever 92 held in adjusted position by a spring plunger 96. Mechanism is provided for bringing the grinder into operation during the treatment of, say, every eleventh shoe. A switch of ordinary construction has its movable contacts mounted on a shaft 106, which shaft carries a disc 108 formed with four notches corresponding, in turn, to open and closed positions of the switch. A latch lever 112 co-operates with the steps forming these notches. A ratchet wheel 118 is loose on the shaft 106, but is connected to the disc 108 by a spring 120. The ratchet wheel is formed with a slot 124 engaging a pin on the disc, and with teeth engaging a stop pawl 134 and a pawl 126 on a lever 130 geared to a lever 142, Fig. 1. This lever is operated, by the lock bolt carrier 146 of the starter mechanism described in Specification 215,772. The lock bolt carrier 146 is moved to the left when the machine is started, causing the ratchet wheel 118 to advance one tooth. When the machine is stopped, the member 146 is moved some distance to the right and then slightly to the left, causing the pawl 126 to be retracted over the teeth, and then to move the ratchet wheel to advance, it one tooth. The ratchet wheel, at consecutive teeth on two diametrically opposite points, has lateral extensions engaging the latch lever 112 to raise it to allow the disc 108 to rotate 90‹ to close the switch as the machine starts, and a second 90‹ as the machine stops, to open the switch. To ensure the latch lever snapping back into the next notch, this lever carries an arm 152 actuated by arms 154 on the hub of the disc 108. As a safeguard, to make certain that the ratchet wheel is timed' to close the switch when the machine is started, and not when it is stopped, one tooth at each side, succeeding that engaged by the pawl 126 when the switch is closed, is omitted. Should the ratchet wheel be one tooth too far advanced, the pawl will slide on the untoothed surface when the machine is stopped, without advancing the ratchet wheel.