Patent GB-107035-A (GB)
IPC: A43D75/00
Abstract: 107,035. British United Shoe Machinery Co., (United Shoe Machinery Co.). May 17, 1916. Stapling.-Relates to detail improvements in a wire staple forming and inserting machine for lasting stitchdown boots and shoes by the process claimed in Specification 25,272/12, [Class 17 (i), Boots and shoes, Apparatus for making &c.], and comprises, essentially, means whereby the machine may be run to produce staples without relatively approaching the work-clamping members, power means for locking one of the work-engaging members in workclamping position after it has been moved manually into that position, an improved worksupport, and an improved construction of lasting- tool. The general arrangement of the machine is similar to that described in the above-mentioned Specification, while the staple forming and inserting mechanism is of the type described in Specification 17,439/05, except that the wire-feeding mechanism is modified to provide room in which the shoe to be lasted can be manipulated more freely. For this purpose the fulcrum 146 of the lever 140, Fig. 3, which carries a roll 142 co-operating with a wire feed roll 90 is located at a point above the roll 90, and the roll 142 is therefore moved laterally instead of downwards to release the wire. The wire is wound on a spool 152, and is prevented from unwinding too rapidly by passing it through a tension device comprising a grooved wheel 158 carried by a spring-plunger 160, which is guided for vertical movement only in a socket 162. The work-support is mounted on a rod 166, Fig. 1, resting on an adjustable stop 182 carried by a pivoted lever 180, the rear end of which is connected by an adjustable link 184 to a treadle lever 186. A second treadle lever 228 is connected by a rod 230 to the starting and stopping mechanism, the arrangement being such that by a continuous movement of the one foot the operator first depresses the treadle lever 186 to effect the stretching and wiping relative movement of the work-support and lasting-tool and then engages the treadle lever 228 to actuate the staple forming and driving mechanism. By depression of the treadle lever 228 only the machine may be run to make fasteners for inspection purposes. In order to lock the work-support during the stapling operation a pair of wedges 103 are arranged to engage beneath rollers 149 carried by a pin 147 driven through the rod 166, the wedges being actuated through links 111, 117, 135, 125 from a cam 119 on the driving-shaft. A spring 145 is arranged in the train of connexions to yield should the wedges meet an effective obstruction, as, for instance, the rollers 149 when the work-support is in its lowest position. The work-support comprises a segmental block 196, Fig. 4, having an inclined face 192 which is offset at 194, the block being formed with flanges 198 engaging, respectively, a grooved horizontally-adjustable slide 200 and a clamp plate 202; a screw 204 clamps the block in its different positions of angular adjustment. The slide 200 is dovetailed into a split block 206 attached to the rod 166, and is secured after adjustment by screws 212, 214; a spring 216 tends to hold the work-support in its lowest position. The bracket in which the rod 166 is mounted has formed on or secured to it a guide 218 having a vertical face 220 over which the block 206 slides; this provides lateral rigidity of the work-support during lasting and also prevents any rotary movement of the work-support. Preferably, a plug 222 of hard material is let into the face 192 of the block 196 to serve as a clinching device for the staple. Fig. 6 shows an improved construction of lasting-tool 240, which is formed with lateral wings 246, 248 pivotally carried on vertical rock shafts 250, 252 extending through overhanging parts 254 of the tool. These shafts are connected by links 256, 258 to a slide 260 actuated by a hand lever 264, movement of which swings the wings 246, 248 to adapt them to the curvature of the last; a spring-pressed dog 272 serves to lock the hand lever after adjustment, The machine is provided with usual means, such as shown in Specification 17439/05 for changing the length of the staple, these means being so connected to the wire feeding and cutting mechanisms that it serves to maintain the two legs of the staple substantially equal. To provide for an adjustment in this mechanism to compensate for any inaccuracies that may arise due to wear, the lever arm corresponding to the arm 106 of the machine described in Specification 17439/05 is made in two relatively-adjustable parts.