Patent GB-191500669-A (GB)
Title: Improvements in or relating to Hand Method Lasting Machines for use in the Manufacture of Boots and Shoes.
IPC: A43D75/00
Filed: 1915-01-15
Abstract: 669. Jerram, A. E., Keall, F. B., and British United Shoe Machinery Co. Jan. 16. Loose-nailing. - The tacking-mechanisms of lasting-machines of the kind described in Specification 14,453/97, [Class 17, Boots &c.], are arranged so that, when inserting tacks, the tacks are separated and driven in one and the same cycle of operations of the machine. The tack pot 6, Fig. 1, raceways 27, separators 38, ducts 83, delivery nozzle 95, and compressed-air devices for impelling the tacks to the tack block, are the same as those described in Specification 670/15. The separators are oscillated by levers 59, 60, 61, pivoted at one end 62 to the separators, and arranged to overlap at their other ends, which are housed between inclined walls on a separator - supporting bracket. These ends are normally held in alinement by springs 50, and are forked so as to be capable of engagement one at a time with the ends of either of two arms 67, 68 projecting from a sleeve 69 keyed on a shaft 70; the arms 67, 68 are spaced apart a distance equal to the thickness of two of the separator levers. The shaft 70 is actuated through a lever 71 and cam-roll 72 from a cam 73, a spring 74 being provided to allow the shaft to become stationary at the end of the separating movement, or to permit the roll 72 to be held out of contact automatically with the cam by a wedge actuated from the mechanism controlling the auxiliary wipers which are used when binding the toe of a welted shoe with wire. The cam is formed so that the separating movement is completed in the first twelfth of the revolution of the main shaft, leaving sufficient time for the tack block to move into position beneath the driver, and for the separator to return to its original position. The sleeve 69 is movable by means of one arm of a bell-crank mounted on a shaft 78, the end 79 of the other arm 80 being adapted to traverse over a perforated arc 81. Pins 82, 82' are provided to control the position of the bellcrank, and thus to determine which, if any, of the levers 59, 60, 61 will be actuated when the bell-crank is operated. The shaft 78 is connected to the bunter 3, and the pins may be set, for example, so that when the bunter is forward, as when working on the heel or toe of a McKay shoe, long McKay tacks would be delivered, and when the bunter is back, as when working on the waist, short McKay tacks would be delivered. The shaft 78 has mounted on it an arm 115, Fig. 3, rotatable with the shaft through a friction coupling 116, 117, 118. This arm adjustably supports the bunter 3, and is pivotally connected to a rod 124, which passes through a sleeve 125 pivoted on a crank-pin 126 on a disk 127 fast on a shaft 128. The feather gauge 4 is supported on a leaf spring, and is adjustably secured to a rod 134 which is formed with an eccentric strap 136 embracing an eccentric 137 on the disk 127. The rods 124, 134 are held in their sleeves by spring- pressed pawls which enable them to be moved by hand when necessary. The hunter is rotated and the feather gauge advanced, or vice versa, by a lever 139, Figs. 3 and 5, having a face 140 to be engaged by the operator's hand or by the shoe. This lever is pivoted on a shaft. 140<1>, and its rear end is formed with a face 142 normally pressed by a spring 144 into a position to engage one or other of two notches on a cam disk 143 on the shaft 128. A coil spring 146 is pinned at one end to the disk 143, and at its other end to a disk 149 loose on the shaft 128. The disk 149 is formed with two peripheral notches adapted to be engaged by a spring-pressed pawl 150, and with two flats 152, 152<1>, adapted to be engaged by the tail 156 of a spring-pressed member 153, which is also formed with a notch 157 to engage one or other of the notches on the disk 143. The disk 149 also carries a pawl 158 to engage one or other of two notches in a disk 160, which is loosely mounted on the shaft 128 and is formed with a toothed sleeve 161 meshing with a segment 163 freely held on a cam-operated reciprocating-shaft 164. A collar 166 pinned to this shaft has a depending portion 167 which is formed with a shoulder 168 adapted to engage the segment 163 in one direction of movement of the shaft 164, and with a shoulder 169 to engage, in the opposite movement, a spring- pressed pawl 170 pivotally mounted on the segment 163. The pawl can be held out of the path of the shoulder 169 by a member 173 held in contact with a slidable rod 176, which is actuated by the cam disk 143. The spring 146 engages the disk 143 in a direction to retract the bunter when the disk is released by movement of the lever 139, the disk being, however, prevented from performing more than half a revolution by the projection 157 on the member 153. As the disk rotates, the rod 176 is moved endways to swing the member 173 so that its arm is withdrawn from behind the pawl 170, and the latter then engages the shoulder 169 so that, on the next movement of the shaft 164, the segment 163 is moved to wind up the spring. The pawl 150 then engages one of the notches in the disk 149 to prevent any backward movement in this disk, while the pawl 158 allows the disk 160 to rotate freely during the return movement of the shaft 164. The lever 115 is also arranged to effect change of driver stroke with certain changes of tack supply. For this purpose, the lever is furnished with a guideway 120, Fig. 7, to receive one arm 192 of a bellcrank mounted on the lower end of a shaft 186, the upper end of which is furnished with a crank-arm 187, carrying a crank-pin 188 which enters a recess in a plate 182 loose upon the driver bar 177. This plate has a castellated lower portion having inclined surfaces and rests on a similarly formed upper portion of a bracket 178. The shaft 186 is furnished with a fixed arm 189, Fig. 9, which is adapted to be connected to the bell-crank on the lower end of the shaft by a spring plunger 195 controlled by a milled nut 197 and a pin and slot 198, 199. When lasting McKay work, the plunger is drawn down with the pin 199 bearing upon the lower edge of an arm 193 of the bell-crank in which the spring plunger is housed, and the lever 115 has no effect on the driver stroke, but when lasting welted work, the plunger is released to couple the arms 189, 192 together, and when the lever 115 is swung as the bunter is withdrawn, the plate 182 is raised and the driver stroke shortened. Instead of the bunter connexions, the tack-change devices may be operated by means which determine the action of the pleating-mechanism.