Patent GB-287090-A (GB)
Title: Improvements in or relating to heel attaching machines
IPC: A43D79/00
Filed: 1928-03-13
Abstract: 287,090. British United Shoe Machinery Co., Ltd., (Assignees of Standish, J. F. March 14, 1927, [Convention date]. Loose-nailing.- A heel-attaching machine is provided with means for varying the work-clamping pressure for different thicknesses of work or qualities of material. To this end a work-clamping element makes an initial movement to effect a measuring of the work ,and the final clamping pressure is adjusted automatically in accordance with this measurement. Means is also provided for distributing and loading predetermined numbers or groups of nails. As shown, a jack-post 16, Fig. 1, adjustable by means of a sleeve 22 has a jack-top 18 with driver passages. Any one of a set of jacks may be used to give differing arrangements of passages. A driver plate 28 carrying drivers 30 is reciprocated vertically bv a lever 42 and cam 44 on a driven shaft 46. The cam is so shaped that the drivers have an even rate of movement throughout their stroke. The initial position of the plate 28 is adjustable by means of a contact screw 34 to vary the stroke of the drivers. The shaft 46 is clutched to its pulley 48 by a suitable clutch. A workclamping head 52 formed with heel and top-lift holding devices and spanking devices 54 is adjustably mounted on a vertically movable cylinder 56. Within the latter is a hollow plunger 58 constituting with it a telescoping oil-container. The cylinder 56 is connected by a lever 60 and a rod 62 to a treadle 64, and is normally held raised by a spring 68. The treadle is pivoted to a slide 66 weighted by weights 70. The plunger 58 is carried by a lever 72 connected by spring-raised rods 76 to a lever 78 having a roll contacting with a cam 80 on the shaft 46. Guided within the plunger 58 is a spring-raised rod 84 having at its lower end a valve 86 coacting with a seat on the plunger. A roll on the upper end of the rod 84 is engaged by a cam-lever 94 joined by a rod 96 to the lever 60. The rod 96 is adjustable to vary the initial position of the valve 86. A nail distributing mechanism of the general character described in Specification 286,780, includes a bracket 120 upon which is pivoted a support 124 carrying a nail receptacle comprising a conical casing 128 and a rotatable drum 134. The support 124 may be tilted backwardly to return all the nails into the drum 134, and the latter is readily removable so that it may be refilled with different nails. Eleven raceways 142 are shown, each provided with clear-' ing wheels 144, Fig. 7. mounted on a shaft 146 driven by belting from the main shaft under control of a clutch member and a handle. The nail drum is rotated from the shaft 146 through gearing 158, Fig. 1. To prevent, as desired, delivery by certain of the raceways, fingers 166, Fig. 8, are held in position to close the raceways by springs 164. The fingers are raised in prearranged combinations by cams 170 on a shaft 168 rotated by a handle 172 moving over an indicating disc 178. Separating discs 180 for each raceway are operated by pinions 186 and a rack-bar 188 reciprocated by a lever 192, Fig. 7, link 194 and lever 196. Nail inverters 200, Fig. 9, for each raceway are adjustable diagonally towards their raceways, to deal with nails of different lengths, by levers 214 and a handle 220 moving over an indicating plate 226. The nails fall into passages 202 having a removable wall 206 for dealing with clogging, and thence through tubes 228, Fig. 7, to tubes 230 carried by interchangeable frames 232 and so to a foot-plate 234. By changing the frame 232, varying nail arrangements are obtained. A loader block 240 closed by a shutter 244 is carried by a rack-bar 242. When the block 240 is in nail-receiving position a shutter 250 between the tubes 228 and 230 is open. When the block moves away the shutter 250 is closed by a spring. When the block 240 reaches nail delivery position its shutter 244 is tripped by engagement with the jack-post. The rack bar 242 is operated by a gear 258 which is driven frictionally by a tubular shaft 260, so that when the loader block is arrested in either of its two positions the drive slips. About the shaft 260 are bevel pinions 264, 266, of which the former is constantly driven by a chain 268 and is normally clutched to the shaft by a clutch member 278, so that the loader block is held in nail receiving position. The member 278 is moved to disengage the pinion 264 and engage the pinion 266, so reversing the drive, by a rod 279 and hand-lever 280, the pinion 264 being automatically re-engaged after one revolution of the shaft 260. Turning with the shaft 260 is a cam 290 acting upon the lever 196 to operate the separator discs 180.