Patent GB-380804-A (GB)
Title: Improvements in or relating to fastening supplying mechanism for or of shoe machines
IPC: A43D71/00
Filed: 1931-06-22
Abstract: 380,804. Nailing. BRITISH UNITED SHOE MACHINERY CO., Ltd., Union Works, Belgrave Road, Leicester.-(United Shoe Machinery Corporation; 140, Federal Street, Boston, U.S.A.) June 22, 1931, No. 17976. [Class 89 (iii).] A fastening supplying mechanism comprises one or more raceways 12, a raceway cover 36, and means movable into operative position in response to displacement of the cover to prevent delivery of fastenings from the raceway. The mechanism is described with reference to a machine for feeding tacks t to tack-driving mechanism as set out in Specification 12304/03, [Class 17, Boots &c.]. Tacks t are fed from a hopper down the raceways 12 to a separator 14 into tubes 16 leading to the tack-driving apparatus. The separator is detachably connected to and driven by a reciprocating slide 22. An end block 24 is mounted in front of the ends of the raceways and serves as a guide for the separator and also provides grooves 26 to direct the tacks to the tubes 16. The end block carries plates 28 overlapping the separator and is formed with slots 30 adapted to receive tacks from the raceways. A cover-plate 32 is fixedly mounted over the upper ends of the raceways and a cover 36 is pivoted to it at 33 by arms 35 so as to cover the lower ends of the raceways. When the separator is obstructed, the end block and separator usually have to be removed ; means are provided to prevent tacks then escaping from the ends of the raceways. A bar 47 is adapted to extend across the ends of the raceways and carries fingers 48 adapted to engage the grooves of the raceways under the lowermost tacks. The bar 47 is carried by arms 49 pivoted at 50 on a short slide 52 adapted to slide in grooves in the fixed coverplate 32. The bar 47 is normally held upraised by a spring 62 and with the arms 49 is accommodated in recesses 64, 66 in the cover. When the cover 36 is lifted, Fig. 3, cam faces 68 on the arms 35 force the arms 49 and the fingers 48 down into engagement with the lowermost tacks, and the slide 52 is moved back to retract the tacks on to the raceways by a link 70 pivoted to the cover 36. The latter is retained in closed or open position by spring plungers 76 engaging flat faces 80, 78, respectively, on the arms 35. The cover is further retained in the closed position by a member 82, such that the end block may not be removed unless the cover is opened, in which case the tacks are held. The separator slide is operated from a rock shaft having gear teeth engaging a rack bar formed with slots engaged by projections on the slide. In a modification, the tacks are held by spring plungers exerting a pressure on their heads. The plungers are carried by bars pivoted direct to the fixed cover plate and are normally urged down on the tacks by springs, but are pressed up when the cover 36 is closed, pins on the cover then engaging the ends of the plunger bars. A hammer 174, Fig. 9, may be provided to strike the cover, thus jarring the raceways and facilitating feeding of the tacks. The hammer is pivoted at 176 to the cover and is urged down thereon by a spring 180 and is raised periodically by a roll 186 on a member 184 engaging a pin 188 on the hammer. The member 184 is pivoted at 190 to a slide 182 and is controlled by a leaf spring 192. The slide 182 is reciprocated to operate the hammer from the separator slide, a forked extension 196 detachably engaging a screw 198 on the separator slide.