Patent GB-967721-A (GB)
Title: Improvements in or relating to fastener-inserting machines
Inventor: GARBETT ROBERT MARK
IPC: A43D69/04
Filed: 1959-09-11
Abstract: 967,721. Attaching top-pieces to heels. BRITISH UNITED SHOE MACHINERY CO. Dec. 9, 1960 [Sept. 1, 1959; Oct. 15, 1960], Nos. 30999/59 and 35420/60. Heading A3B. A fastener inserting machine comprises means for simultaneously feeding a plurality of wires 2 through a cutting device which cutting provides a plurality of fasteners and means for driving the fasteners simultaneously into a workpiece held in the machine, which also provides means for effecting a plurality of nailing patterns. In the construction shown the wires 2, being a maximum of nine, are passed through a feeding device which comprises two blocks 52 and 54, supported by the bracket 46, and the block 54 connected to a slide 116 in a slideway 60 in the bracket 46 so that it is capable of rectilinear movement, the movement being effected by the rotation of pin 123 and consequent movement of the geared member 122 in the teeth 120 which are attached to the slide 116. The blocks 52 and 54 are similar in construction. The block 54 comprises a base plate 62 upon which are mounted a series of plates 66, 64, 68 &c. clamped together by four bolts 63, each plate 66 having one edge upturned and the opposite edge downturned, the lengths of the upturned and downtumed portions being equal to the thickness of plates 64, &c. The plates 64, 68, 70, 72, 74, 76, 78, 80, 82, 84 and 86 are placed in pairs, each pair being alternated with plates 66, the internal edges of the former plates being offset from the upturned or downturned portions of the plate 66 except in the case of plates 74 and 78 the edges of which abut against the respective faces of the aforementioned portions of plates 66. Thus nine tunnels 56 are formed, five in the back facing side of the block and four in the front facing side. Each plate 64, 68 &c. except the two plates 74 and 78 possess two cut-away clearances 90 and 108 in which pawl 88, 106 and cam 94, 112 devices are situated these devices being associated with each tunnel 56. The pawl devices 88, 106 associated with clamping springs 92, 110 are mounted on the spindles 63 while the cams are mounted on further spindles 96, 98 having knobs 103, 105 for rotating the cams 94, 112. By setting the knobs to a predetermined position as seen by the operator through windows associated with the block 54 which windows coincide with the cut-away clearances 219 in the bracket 46, a set number of wires 2 in the tunnels 56 are gripped by the pawls 88 against the tunnel wall. As the block 54 moves in the direction of the arrow in Figs. 11 and 12 the wires being gripped follow the motion but on the return stroke of the block 54 the pawls do not grip the wires due to the direction of their spring loading and therefore the wires remain stationary. The pawl 106 and cam 114 devices are all similarly mounted about their respective spindles 96, 98 and, if the knobs 103, 105 are set in certain positions, the pawls will grip all wires on the return stroke. This facilitates removal of the wires from the rest of the feeding and guiding mechanism when the guiding mechanism needs to be interchanged. The pawl and cam devices in block 52 are similar to those in block 54 but opposed gripwise. The wires having been fed through the block 52 pass into a guiding device 38 which comprises two plates 42 and 44, the end plate 42 being spaced apart from the end plate 44 on a base portion 40 of the plate 44. The end plate 42 is bored with nine passages to receive the feed wires, the opposite end plate 44 being bored with nine passages in a formation which passages align with the passages in the stationary shearing die 4. The wires fed during an operation pass through the passages in plate 42 into tubes 36 which guide the wires into passages in plate 44. The guiding device 38 is mounted in the bracket 46 by a screw 48 so that the device is easily interchangeable with a guiding device having a different configuration of passages in plate 44. The stationary die 4 possesses twenty seven passages, this number of passages in a given formation being sufficient to enable all the necessary formations of fasteners to be provided for the affixing of top pieces to heels. The shearing face of the stationary die 4 is curved to allow the movable part of the shearing die 6 to rotate through 90 degrees in an anticlockwise direction on a shaft 144 thus bringing the sheared off fasteners from a horizontal to a vertical position. The curved face of the rotating die comprises a curved plate 50, having a similar configuration of passages 5 as the curved face of the stationary die 4, screwed to a holder 146. The holder 146 comprises a plate with two forwardly directing projections 148, 150, projection 150 being in two parts spaced at a distance apart to allow a driver bar 140 to pass between them. The projection 148 is provided with the configuration of twenty seven passages to coincide with those in the plate 50 into which pass drivers 142 which are joined to a plate 152. Plate 152 is mounted for sliding motion in the holder 146 on a pair of posts 154 extending between the projections 148, 150 with compression springs 156 normally urging plate 152 away from the projection 148 in a direction perpendicular to projection 148. Thus the motion of the driving bar 140 on to a face 158 of the plate 152 and the subsequent motion of the drivers 142 forces the fasteners into a top piece and heel, these being held in position against a work plate 182 by a sprung post 160 and an adjustable device 184 for positioning and gripping the top piece and heel relatively to each other which comprises two pairs of sprung interconnecting fingers, a heel gauge and a top piece gauge, each gauge being associated with a pair of fingers. The sprung post 160 which is allowed to slide vertically in a bearing housing 162 is adapted to receive at its upper end a sleeve carrying either a support for loose heels or a support for shoes with heels attached thereto. Rack teeth 166 formed along a portion of the post 160 engage with teeth of a gear 168 fixed on a spindle 170 which is mounted for rotation about a horizontal axis in the housing 162. Two torsion springs are placed one on each end of the spindle 170 which by tending to unwind lift the post 160 by the action of the gear 168 and rack teeth 166. These springs are prevented from unwinding by attachment to the spindle 170 and also part of the housing 162 which takes the form of a rotatable torsion head so that one spring is used to obtain a thrust of the post 160 approximating to that required while the other spring gives the fine adjustment. An adjustable stop member 173 is screwed on to the lower end of the post to limit upward movement of the said post 160 by engagement with the underside of the housing 162. The post 160, when holding a workpiece in position may be locked prior to the driving of the fasteners. This locking is effected by a wedge 254, being pivoted about a pin 256 by a spring 258 and a bell-crank lever 260 pivoted about a pin 262, clamping against the post 160. By the depression of a treadle a composite spring link causes the torsion springs around the spindle 170 to lift the post 160 and so clamps the workpiece in position, the composite link being sprung so that only a limited amount of torque is given to the torsion springs so that the thrust of the post 160 may not damage the workpiece. The depression of the treadle also operates a cam shaft through a further composite link, the rotation of the cam shaft and associated cams initiating an operative cycle of the machine. The second composite link, i.e. from the treadle to the cam shaft is so constructed that the operation of the machine will cease after the completion of one cycle whether the treadle remains depressed or is reset for a further operation. Specification 913,099 is referred to.