Patent GB-309054-A (GB)
Title: Improvements in or relating to automatic machines for operating upon boots or shoes
IPC: A43D95/20
Filed: 1927-11-29
Abstract: 309,054. British United Shoe Machinery Co., Ltd., and Keall, F. B. Nov. 29, 1927. Edge-setting and burnishing; trimming.-Relates to machines of the kind described in Specifications 14696/08 and 22503/09. wherein the margin of a shoe sole and a tool operating thereon are automatically relatively traversed, the action commencing at one side of the sole and continuing around the forepart and back again, while automatic means vary the relative aspect of the tool and work in accordance with the shapes of the sole margin, and consists in detail improvements. The traversing movement mav extend to the heel breast line on either or both sides of the shoe and be reversed by contact of a feeler with the heel breast. The tool may be automatically tipped in a plane at right angles to the plane of the sole, when operating on the waist portion. The pressure of the tool on the work may be automatically varied during the traverse. An edge-setting tool may be automatically given a twist about an axis substantially parallel to the tread face of the sole, to facilitate its passage from the fore part to the waist portion of the sole or from the waist to the forepart. The feelers 1, Figs. 3 and 4, described in the prior Specification are provided with additional pivots 2 so that they can yield on contact with the heel breast. This yielding movement is transmitted by links, levers, telescopic rod and universal joints to a bell-crank lever fixed to a shaft described in the prior Specifications as associated with the jack reversing mechanism. The other end of this lever is linked to an arm 25, Fig. 5, on which are pins engaging pawls 30, 31 alternately engaging the ends of a slide 33, the slide being urged toward the pawl in action by a spring 36 carried by a slide 38 linked to a lever 40 operated by a hydraulic piston 41 and connected by a link 45 to the jack reversing valve described in the prior Specifications. The valve plunger 43 for this piston is actuated by an arm 44 operated by the slide 33. The effect of this mechanism is that when one of the feelers contact with the heel breast the pawl in operation is tripped and the slides 33 reversed, operating the lever 40 to reverse the travel of the jack and also set the other pawl and slides for reversal at the other extreme of the travel. To prevent the automatic reversal of travel when the joint of the, shoe is reached, the reversing cam 46, Fig. 6, which operates the jack reversing plunger 65 through a lever 52 as described in the prior Specifications, has secured to it an additional cam 47 linked to a step 53 sliding on the lever 52 and coacting with a step 54 on a slide under the plunger 65. The shaft 64 for setting the point of reversal for right and left shoes described in the prior Specification, is provided with a. crank linked to a lever 59 actuating the slide 55. This mechanism, normally, shifts the steps 53, 54 out of line for each alternate reversal, rendering alternate movements of the lever 52 idle. Should reversal at the joint be desired at both sides of the shoe, the crank 62 is set at mid-position. The starting lever 66, Fig. 1, is pivoted to a rod 67, Fig. 9, slotted to engage a pin 70 on a lever 71 bearing against the end of a lever 73 engaging a rod 75, Fig. 1, on a lever operating a valve 78 controlling a hydraulic plunger 79, Fig. 8, operating a rod 80 carrying a fixed block 81 and a sliding block 82 between which is a spring 83 through which the tool is pressed against the sole edge. The block 82 is apertured to receive a block 84 loosely engaging the rod 80 and fixed to a lever 86 by which the tool is moved towards and from the edge of the sole as described in the prior Specifications. The block 82 carries a plate 72 on which is the pivot of the lever 71. This plate is engaged by a slot in a bar 87 secured to the block 81 and carrying a bar 89 co-operating with one end of a lever 90, the other end of which engages the lever 71. When the starting lever 66 is operated the rod 67 releases the lever 71 and the rod 80 compresses the spring 83 to press the tool against the sole edge, the bar 89 contacts with the lever 90 which is pivoted to a lever 92 pivoted to the lever 86, Fig. 10, and connected by a link 94 with one arm of a bell-crank lever 95, Fig. 11, co-operating with a pin 97 on a bar 98 fixed to a hydraulic plunger 99 controlled by a lever 101 operated by a rod 103 pivoted to a lever 104 bearing cam pieces 106, 107 in the path of a pin 108 on a slide 109 reciprocated to drive the jack as described in the prior Specification. As the joint at one! side or the other of the shoe is passing the tool, one of the cam pieces operates the plunger 99 and allows the spring to expand, reducing the pressure of the tool against the sole edge while the waist is being operated on. To remove the tool from the sole edge at the end of the operation, the rod 80 carries a block 110, Figs. 8 and 10, co-operating with washers 111 resting on the block 82. To take up the gap between the block and washers, a distance piece 114 is urged into operative position by a spring. When the rod 94 is moved to decrease the compression of the spring 83, a. plate 116 on the rod engages an arm 118 extending from the distance piece to swing it out of the way. The edge-setting iron 119, Fig. 13, is tipped either upwardly or downwardly as it traverses the waist. The iron is tipped about the points 120 of the holder by an eccentric portion of a shaft 123 squared at the end so that it can be turned by a shaft 125 geared to a shaft 132 carrying a bevel pinion 134. This pinion and the shaft are normally connected by teeth on members 137, 139, but on separating the members by hand against the action of a spring 141, the direction of tip may be set. The bevel pinion 134 is alternately rotated through, a predetermined angle in opposite directions by a rack 151, Fig. 11, yieldingly connected to the plunger 99, the rack gearing with a pinion driving a pair of bevel wheels moved alternately into gear by a lever actuated by a push rod 161 resting on a cam 159. This cam has alternates high and low portions and is moved one step by a pawl 156 for each reciprocation of the slide 109. The iron is thus tipped in opposite directions while operating on the waist portions of successive. shoes, and returned to horizontal position while the forepart is being treated. The weight of the edge-setting iron and its operating and supporting mechanism is supported by a coil spring 170 adjusted by a worm and hand-wheel 177 and connected to an arm 171, Fig. 1, connected by a link 172 to the bearing frame 128. An automatically adjustable spring 176, Fig. 11, co-operates with the spring 170. A link 176 connected to the bearing frame 128 engages one end of a lever 187 the other end of which is linked to an arm 185 fixed to a. rock shaft 184 also carrying an arm 183 engaged by a rod 179 over which the spring 178 is threaded. The compression, of the spring is determined by the position of an arm 180 secured to a hydraulic plunger 189 normally urged downwardly, the plunger being controlled by a valve 190 operated by a link 192 from a lever 193 pivoted to a slide 196 connected by a link 200 to a bar 201 resting on arms 202, 203 loosely pivoted on a fixed shaft. The arm 203 carries a lever 205 which, when the rod 161 rises, is swung by a pin 208 into position to be engaged by a lug 206 on a, bar 207 connected to the plunger 99. Rise of the plunger lifts the pivot of the lever 193, the free end of which is prevented from rising by a stop 194 on the arm 180, the plunger 189 rises and the iron is pressed downwardly. When the rod 161 engages a low part of the cam 159 the corresponding pressure of the iron is lightly upward. The upwards or downward pressure of the iron is, further, automatically controlled by the twisting of the iron under the control of the feelers which engage the tread face of the sole. The projection 334 from the iron holder, described in the prior Specifications, is linked to a pivoted arm 211, Fig. 14, carrying a pair of cams 213, 214. The cam 213 engages a roll 215 on a pivoted lever the other end of which engages the arm 202. The cam 214 engages a roll 219 on a lever 220 the other end of which is pivoted to a lever 223 carrying a link 228 and a pin engaging a slot in a link 226 pivoted to the lever 216. The other end of the link 228 is pivoted to one arm of a lever 229, Fig. 16, the other arm of which carries a cam 231 and a plate 238 co-operating with a latch lever 236 operated by a rod 240 engaged by cams 241, one of which is shown, carried on a slide moving with the slide 109. The cam 231 co-operates with a roll on a lever linked to the lever 40. The effect of this mechanism is that the cam 213 controls the heightwise pressure of the iron on the sole edge when the iron is traversing the curve at the waist towards the heel. If, during this part of the iron's traverse, the iron is tipped upwardly, the upward pressure is increased by the cam 213. If the iron is tipped downwardly, the upward pressure will be so reduced that the pressure of the iron on the sole edge is downward. When the iron is traversing down the curve at the waist, the cam 214 is in action, the cams 241 operating on the rod 240 at the joint. The cam 214 by its action in decreasing upward pressure, assists the downward travel of the iron. When the iron is traversing the fore part of the shoe no twisting of the iron tapes place. To give the iron a lead on to or off the curve at the waist, it is twisted slightly about its horizontal longitudinal axis by an adjustable cam operating mechanism connected with the valve controlling the twisting of the iron, the direction of twist being reversed at each reversal of the jack by connections with the lever 40.