Patent GB-186126-A (GB)
Title: Improvements in or relating to machines for attaching heels to boots or shoes
IPC: A43D79/00
Filed: 1921-06-16
Abstract: 186,126. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). June 16, 1921. Heels, machines for.-In a heelattaching machine of the kind in which fasteners are driven from inside the shoe, and including a lateral heelengaging member, as described in Specification 100,111, means are provided for establishing preliminary contact of the pressure devices and the heel and maintaining the pressure during the driving operation. The shoe is supported on a jack-post 24, in which reciprocates a plunger 28 operated by a crankdisc 34 on a shaft 36 rotated through a singlerotation clutch 38 by a pulley 40. Driverholders 43, 44, 45 mounted to slide and rock in ways in a carrier head 42 on the plunger 28 carry drivers 26, the upper ends of which move in guide-tubes 51, 52, 53. The tubes 52, 53 have flanges sliding in ways 56 in an upper plate 58 which also has inclined slots 62 to receive the tubes 52 vertically aligned with slots 62 in a lower plate 60. whilst slots 64 receive the tube 53. Three tubes 51 are formed in a plate 66, which has slots 67 oppositely inclined to the slots 62 and a boss 68 threaded to receive a screw 70 by which the position of the tubes 51 may be adjusted, at the same time moving the tubes 52, by the cam action of the slots 62, 67, to suit a large or small heel. The rear guide 53 is clamped between the plate 58, 60 by screws 74, which also hold an adjustable back gauge 76. The pressure device comprising interconnected tread and fork members 86, 88 is mounted on a head 82 vertically movable in ways in the frame and including a slide. 84 horizontally movable in the head. The fork 88 comprises a central support 94 held forward by a spring 102 and having teeth 100 in mesh with teeth 101 on side members 96 pivoted to the carrier 90 and joined by a flexible band 106. When the fork 88 contacts with the heel the member 94 yields, causing the members 96 to move together and wrapping the band 106 about the heel. The head 82 is held normally raised by wire ropes 112, 120 passing over surfaces 114, 118 of wheels 116 and connected to springs 126. Pressure is applied through a treadle 132 having a floating fulcrum furnished by a link 134 and lever 136, the forward end of which is normally raised by a spring. When the treadle is depressed, it turns about this fulcrum and lowers the head 82 through links 142, 146, gear-segments 148, 150. and links 152, 154. Contact with the heel arrests the movement of the link 142, which then acts as a fulcrum so that the forward end of the lever 136 is lowered. This depresses a contact member 158 on a rod 156 against a spring-held bell-crank lever 160, permitting the clutch 38 to operate. The movement of a pin 162 on the. rod 156 in a slot 164 disengages the member 158 from the clutch lever 160 at the end of one rotation. A cam-disc 172 fast on the shaft 36 contacts with a roll 174 on a bell-crank lever 176. This lever is connected bv a link 178 to a double-toggle lever 184 which, when straightened, causes the engagement of clutch plates 193, 194. The plates 193 are fast on the head 82 and the plates 194 are fast on an actuator 196 joined by a rod 200 to an eccentric 202 on the shaft 36. The toggle-lever 184 is normally held in broken position by a spring 204. When rotation of the shaft 36 begins the cam-disk 172 lowers the link 178 and straightens the. toggle, which forces the plates 193, 194 into engagement, when the actuator 196 and head 82 move together under the influence of the eccentric 202 to apply pressure to the heel, this pressure continuing during the driving operation. The extent of the pressure applied by the members 136, 88 may be varied by adjusting the eccentric 202 along an inclined portion 208 of the shaft 36. The rise. of the head 82 on release of the clutch plates 193, 194 is preferably cushioned by a dash-pot device comprising a cylinder 212 in the head of which moves over a piston 214 having airpassages and adjustable valves. In operation a shoe is placed on the jack 24 after adjusting the driver-tubes to the required size. The treadle is then depressed, first bringing the members 86. 88 against the heel through the link 142, and then tripping the clutch 38 through the. rod 156, lowering the head 82 through the eccentric 202, and driving the nails through the crank-disc 34.