Improvements in or relating to shoe-upper conforming machines

Abstract

297,372. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). June 20, 1927. Lasting.-An end lasting machine includes separate trains of mechanism for producing independently the advancing and closing movements of the wipers, with means controlled by the character of each shoe to set the wiper carriage preliminarily so as to produce an upwiping movement of predetermined extent. The wiper movements are controlled by springs which are locked before overwiping commences and a clutch arrangement is provided allowing the machine to be stopped in any of several predetermined positions. As shown applied to the toe-wiping mechanism of machines of the general character described in Specifications 22630/08, 25608/09, 106,297, and 142,931, a jack 22 and heel-lasting mechanism 26 of usual form are provided. Toe wipers 30 in a head 34, Fig. 6, are closed by pinions 36, racks 38, and a pinion 40 on a shaft 42. The head 34 is on a sleeve 44 movable, to advance and retract the wipers, in a sleeve 46 on a head 48 tiltable about a shaft 50, Fig. 3, to align the wipers with the shoe bottom, by a handle 52. The head is also adjustable about a vertical axis by a hand-wheel 56, longitudinally of the shoe by a hand-wheel 66, and automatically laterally of the shoe during the upwiping operation. The wipers are adjustable about an axis extending longitudinally of the machine by means of a handle 68. A shoe holddown 80 operated by a rod 96 and treadle 98 is initially adjustable on its rod 88 by a handle 90 and is locked in adjusted position by a pawl and ratchet 92, 94. Fixed on the rod 88 in predetermined relation to the hold down 80 is a bracket 110 in which a rack-block 112 is adjustable by a bolt 114. The latter is connected by a telescopic link 118 and universal joints to the vertical adjusting device controlled by the handle 52, so that initial setting of the wipers controls the position of the rack 112. The latter is in mesh with a segment 120 linked to a lever 128 which carries at its upper end a pinion 130 and at its lower end a block adjustable along a curved slot in a cam-operated lever 138. Thus, when the rack 112 is lowered with the hold-down 80 it moves the lever 128 to vary the effective length of the lever 138. The latter is rocked by a cam 146 to move the pinion 130 vertically, thus raising through a rack 132 the slide 64 which carries the wiper head a distance controlled by the setting of the rack 112. A rack 134 also in mesh with the pinion 130 is connected to a. camoperated bell-crank lever 180 through a heavy spring 182, so that upward movement of the rack 134 is yielding, and downward movement is positive. By this arrangement, the rack 134 is lowered to give a positive upward movement to the rack 132 and slide 64 for the upwiping operation, and is then raised to press the wipers yieldingly against the shoe bottom during overwiping. The advancing and closing movements of wipers 30 are effeded through a pair of bellcrank levers 192 operated by cams on the shaft 148. The levers 192 are. connected to a pair of plungers 196 each surrounded by a sleeve 198, Fig. 5, enclosing a spring 200 the tension of which is adjustable by a knurled bead 204. The sleeves are formed with racks engaging pinions 210, 212 on vertical shafts connected respectively by universal joints to telescopic shafts 216, 218. The rock-shaft 218 is connected at its upper end by a universal joint to a shaft 219, Fig. 6, carrying a toothed segment 226, the shaft 218 being in two relatively rotatable parts loosely connected through a spring 232. By this arrangement the segment 226 is driven in one direction positively and in the other yieldingly. The segment 226 is in mesh with a rack 234 secured to the sleeve 44, so that rotation of shaft 218 causes advance or retreat of the wipers. The shaft 216 has similar connections with a toothed segment 246, whereby the shaft 42 is operated to cause closing or opening of the wipers. By providing an adjustable connection Fig. 7, not shown, between the levers 192 and their respective plungers 196, the rate or extent of the advancing or closing movements of the wipers can be independently adjusted. Initial lengthwise and closing adjustments of the wipers may be made by varying the tension of the springs 200. The latter, which allow yielding contact of the wipers with the shoe during the upwiping, are preferably rendered inoperative during overwiping by means of latches 284, Fig. 3, which become operative at the end of the upwiping stroke. The cam-shaft 148 is driven from a pulley through a worm and worm wheel, the latter being connected by spring pins to one member of a. Horton clutch. The latter comprises two discs 158, Fig. 2, one.formed with a single stop a co-operating with a controller 160 and the other with stops b, c co-operating with a controller 162. The controllers 160, 162, of the type ordinarily used in a Horton clutch, are mounted on a three-armed lever 164 connected by a link 166 to a clutch treadle 172. With the latter in its highest position, the stops band c will operate to stop the machine either in starting position or at the end of the upwiping operation. In its lowest position, the stop a will stop the machine after overwiping with the wipers in tacking or wiring position. With the treadle central, the machine will continuously repeat its cycle of operations. In operation, with a shoe in position, the hold-down 80 is depressed, this operation, through the rack 112, varying the effective length of the lever 138. The wipers 30 are adjusted, manipulation of the lever 52 further adjusting the lever 138 to compensate for any vertical adjustment of the wipers. The clutch treadle is then operated, causing the. wipers to be raised through the lever 138, to, be closed on the shoe through the levers 192, and to upwipe the toe through the lever 180. The levers 192 are then rocked to cause a double overwiping operation of the wipers, the lever 180 meanwhile operation yieddingly to impart ironing pressure to the upper. The precise sequence of operations is determined by the position of the controllerlever 164 according to the manner in which the clutch treadle is operated.

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