Patent GB-286780-A (GB)
Title: Improvements in or relating to heel-attaching machines
IPC: A43D79/00
Filed: 1926-12-09
Abstract: 286,780. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Dec. 9, 1926. Loose-nailing.- Relates to machines, for attaching heels from the inside of the shoe, of the kind in which nails are separated from a gang of raceways, reversed and transported to a shoe entering support provided with nail guides and drivers, and consists in improvements in the nail loading devices. A power-operated carrier transfers the gang of separated and inverted nails to the shoe support at a time determined by the operator, and returns to receive a fresh gang. A shutter arrangement is provided at each end of the carrier's travel to prevent discharge while the carrier is absent. The carrier is frictionally actuated by two oppositely and continuously rotating members selectively engaged by a double clutch. Two rotating nail drums 28, 30 are provided, the upper one having a single raceway 24, and the lower one four raceways 26, the single raceway supplying a nail of special form, e.g., with a helical rib. The nails are lifted, as usual, by blades inside the rotating drum. To remove nails lying across the inclined raceways toothed clearers 56, frictionally clamped on a friction driven shaft, are positioned above the side members of each raceway. A rotary separator 76, Fig. 5, is provided for each raceway, a notch 80 carrying one nail for each oscillation of the separator to a continuation of the raceway, which continuation is more steeply inclined than the remainder. As the separated nail slides down the steeper portion it is reversed by striking a plate 110 and falls down its corresponding guide tube 120, Fig. 1, to the foot plate 124. The nails are at this time retained in the openings in the foot plate by a shutter 126 provided with openings corresponding to those in the foot plate but urged to the left with the two sets of openings out of alignment by a spring 128. The nails are transferred to the jack by a loader block 132 reciprocated by a rack 154. When the block is in the position shown, a stop 140, moving with the rack 154, maintains the shutter 126 with its openings in alignment with those in the plate 124 so that the nails fall into the block. To load the jack with nails the operator pushes a pad 200 on a lever 192, Fig. 3, operating a pull rod 186 secured to a double clutch 184 engaging one of two oppositely and continuously rotating bevel wheels 170, 172. The clutch drives a sleeve 158 having a flange 162 backed by a friction washer 164 also engaging a spur wheel 156 gearing with the rack 154, the friction being regulated bv an adjustable spring 166. To the sleeve 158 is also secured a one-wav clutch driving a cam 106. Normally, the wheel 170 is maintaining the loader block in the position shown, determined by a stop 136, Fig. 1, the friction drive slipping. When the operator pushes the pad 200, against the pull of a spring 198, the wheel 172 is clutched to the sleeve 198 and the loader block 132 traversed to a position above the jack determined by a stop 142. As it reaches this position a stop 140, Fig. 8, engages the jack and actuates a latch 146, releasing a pivoted shutter 144 which, under the pull of a spring 148, allows the nails to fall into the guide tubes in the jack. The cam 106 is formed with a recess 206, Fig. 3, which co-operates with a spring plunger on the lever 192 to declutch the wheel 172 after one complete rotation of the sleeve. At the end of this rotation the spring 198 reverses the clutch 184 and returns the loader block to normal position, a fixed projection 152, Fig. 8, returning the shutter 144 as the loader block commences its return. All the above mechanism is driven bv a friction wheel. Specification 100,111, [Class 17 (i), Boots and shoes, Apparatus for making &c.], is referred to.