Patent GB-182914-A (GB)
Title: Improvements in or relating to boot or shoe upper pulling-over machines
IPC: A43D13/00
Filed: 1921-04-12
Abstract: 182,914. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). April 12, 1921.. Pulling-over. - A pulling-over machine is provided with means ior obtaining automatically a desired position, lengthways of the last, of a point on the tip line of the upper. In the machine of the general type illustrated comprising in its organisation a toe-gripper and two pairs of side grippers operating as described in Specification 12304/03, this object is attained by positively positioning the last by means of the toe-gripper. The side-gripper jaws 2, Figs. 1 and 2, are mounted on a casing 4 connected by a bar 6 to an updraw lever 8 operated by means of a cam on a shaft 14 through a slide 16 which carries rods 18 encircled by springs 20 bearing on the rear ends of the levers 8. The toe-gripper comprises a pair of jaws 22 carried by a casing 24 and similarly operated though a lever 26. The machine is controlled through the usual treadle rod 30 engaging a slide 34 operating the clutch through the clutch rod 36. The sidegrippers, the pairs of which have a mark 58 to indicate the correct location of the tip-line are closed manuallv on the work before the machine is started. As the machine stands idle a space is provided between the rear ends of the levers 8 and the top of the cam slide 16, the levers being held up against their operating-springs 20 by springs 60 connected at their upper ends to studs 64 and at their lower ends to pins 62 extending through slots in links 70 which are connected at their lower ends to arms 72, these arms 72 being rigidly connected to an arm 74 connected by a rod 76 to a clamp 78 on the treadle rod 30. Clearance is also left between the rod 30 and clutch-tripping slide 34 so that the initial movement of the rod 30 operates the gripper-jaws 2 through the rod 76 before the clutch is tripped. The first movement of the toe-gripper is a rearward swinging movement causing it to push the last backwardly relatively to the held upper. For this purpose a cam 80 fast on a shaft 82 driven from the main-shaft pulley 38 by pinions 84, 86 operates a lever 94 connected by a link 96 to a crank-arm 98 on a rock-shaft 100 mounted in bearings in a bracket 102. Fast on the shaft 100 is a crank-arm 104 on which is pivotally mounted a frame-member 106, the arms of which have plugs 112 at their rear ends with slots to receive the edges of a plate 114 secured on the toe-gripper casing 24- When the machine is started a rise a on the cam 80 operates the arms 106 to cause the toegripper to push the last backwardly in the upper. The limits of this movement are determined by an adjustable connection between the rock-shaft 100 and arm 98 comprising a worm 118 journaled in a bracket 120 fast on the rock-shaft and engaging the teeth of a gear segment 122 integral with the arm 98. By turning the wheel 124 the rock-shaft is rotated relatively to the arm 98 and the requisite rotation for different sizes and styles of boots is indicated by scales 138 on the wheel 124, which are set to a pointer 142. During the updraw movement of the toe-gripper cut-out portions 144 and 146 on the plate 114 and plugs 112 respectively release the toegripper from the plugs and permit operation of the springs 52 to overdraw the upper. Return of the plate 114 into engagement with the plugs 112 is effected by mechanism shown in Fig. 7, comprising a bar 148 carrying a roll 150 in engagement with the toe-gripper bar 25, forward movement being imparted to said bar through a spring 152 from a rack-bar 154 operated by a pinion 156 on a shaft 158. This shaft is operated through a link 162, lever 164 and spring 170, Fig. 5, from a cam 168 on the pinion 84. The bar 148 also carries means for spacing the side-grippers comprising a wedge block 172, adjustable lengthways of the bar 148 by a rack 180 and pinion 182, and engaging rolls 174 on lever arms 176 engaging the side-gripper bars 6. The pinion 182 is carried on a sleeve 184 connected by a toothed clutch 186 to the shaft 158. Means for positioning the side-grippers to compensate for the " swing '' of the last comprise mechanism somewhat similar to that described in Specification 7005/00. The side-grippers are connected to slidable rack-bars 190, 196, Fig. 8, extending respectively above and below pinions 192, 198, fast on a shaft 194, rotatable by a handle 200 in either direction for a right or left boot. The amount of this rotation is limited for different sizes and styles of boots by an eccentric pin 202 on the shaft 194, working within a V-shaped recess on an adjustable member 236. The cycle of operation of the machine is indicated in Fig. 13. When the machine is started the gripperspreading mechanism is withdrawn through the cam 168 at the moment when the rise a on the cam 80 operates the toe-gripper to push the last into the upper. A depression b on the cam 80 swings the toe-gripper clear of the toe-end of the last whilst the upper is pulled, and this is followed by the over-draw and tacking operations. At the points d, e rises on the cam 80 cause re-engagement of the toe-gripper with the arms 106 and at the point f the toe-gripper is carried forward ready for operation on the next boot.