Patent GB-193976-A (GB)
Title: Improvements in or relating to loose nailing machines
IPC: A43D69/02
Filed: 1921-12-05
Abstract: 193,976. British United Shoe Machinery Co., Ltd., and Roberts, W. T. B. Dec. 5,1921. Loose-nailing.-Relates to loose-nailing machines for boot repairers, of the type described in Specifications 16080/11 and 112,325, provided with a normally stationary work-supporting horn, a vertically-reciprocating head carrying multiple nail supply, raceway and separator devices, and consists in improvements in the nail hoppers, separators, feed and driving mechanisms. As shown, five nail hoppers are arranged, movable horizontally, to present any one of the hoppers in nail-supplying position. The hoppers are each pivoted to a rod 21, Fig. 1, about which they may be swung to dump their contents, and along which they are slid when necessary. The fronts of the hoppers normally rest on faces 24. The head is guided by parallel vertical rods 6, 8, the former of which -is secured at its upper end to a member 11 carrying the nail driver and passes through a bearing 7 in the head. The rod 8 is secured at its top to the head, reciprocates in a bearing in the column of the machine and is encircled by a spring 14 which urges the nail driver upwards to a position determined by contacting faces 17. The machine is operated by vertical reciprocation of the rod 6, the head descending with the rod until a nail throat 5 contacts with the work on a vertically-stationary horn 1. As the rod 6 continues to descend the faces 17 separate, a nail is driven and a lever 58 is actuated to raise a bar 61, the upper end of which enters the raceway 31 and is carried by a roller 63 to push nails along the upwardlysloping race. A bar 64 pivoted to the bar 61 simultaneously enters the hopper 25 to cause nails to fall on to the raceway. The relative reciprocation of the member 11 actuates a nail separator, a stud 53, Fig. 2, on the member oscillating a fork 52 frictionally connected to an arm 44 slotted to engage the separator 38 of the raceway in use. Each separator comprises a block 38 bored and slotted to engage guiding rods 39, 40, with a groove 42, Fig. 6, to convey nails from the raceway to the throat 46. An incline 48 on a movable raceway cover 49 disengages the nail from the slot. The descent of the nail driver is limited by an adjustable screw 71, Fig. 1, carried by the member 11 and cooperating with a surface 72 on the head. A plate 73 may be swung between the two when nails are not to be driven below the surface of the work. A work feed mechanism is pivoted about the rod 8 and, when required, retained in operative position by a latch 81. A rod 95 carried by the reciprocating member 11 oscillates a lever 94. which actuates a lever 96, Fig. 2, slotted to engage and reciprocate a member 98 carrying a feed member 101, having two similar toothed ends for reversal after wear. The feed member is adjustable towards or from the nail throat 5 by a screw having a head 87*, Fig. 1. Fig. 8 shows a power drive for the machine, a shaft 129 rotating an eccentric 128 and a face cam 137. The eccentric supports the shaft 6 by a shoe 123 and yielding means comprising a spring 125 and telescoping members 121, 122. Surrounding the shaft 6 and fixed to the head is a sleeve 77 having an enlarged portion 108 formed with ratchet teeth engaging corresponding teeth on an arm 112 having at its lower end a slot engaging a pivot 113. The face cam operates the nail driver by reciprocating a rod 132 carrying a pawl 138 engaging teeth on an extension of the rod 6. The normal reciprocation of the head is limited to the length of the slot in the arm 112, the nail throat 5 being raised this distance after the insertion of each nail to allow of feed. To allow for increasing or decreasing thickness of work the teeth on the arm are disengaged at each descent of the nail driver by cam surfaces 118, 119. To allow the head to rise fully for the insertion and removal of work the arm 112 is provided with a handle 115. In a modification, the machine is operated manually, a pedal normally raised by a strong spring being linked to the lower end of the rod 6.