Patent GB-329412-A (GB)
Title: Improvements in or relating to shoe sole or like pressing apparatus
IPC: A43D25/06
Filed: 1929-02-28
Abstract: 329,412. British United Shoe Machinery Co., Ltd., and Hazelton, G. Feb. 28, 1929. Sole-laying. - A machine for attaching a shoe bottom part to a shoe bottom by means of adhesive comprises a rotary carrier supporting six or more shoe bottom part pressing devices each of which comprises a flexible bottom-partengaging member, and poweroperated means for causing rotation of the carrier, arranged to become operative as an incident of the operation of a pressing device. The pads are preferably inflatable, and means controlling the inflation and denation of the pads are movable with the carrier, and allow inflation of one pad and simultaneous deflation of another during rotation. A column 1 carries, in bearings, a vertical valve stem 15, engaging, by bearings, a turret 3 supporting six sets of sole pressing devices. Each device comprise a bed 25 supported by a. pair of laterallyspaced adjusting screws 29 engaging depressions in the lower face of the bed. The bed is rendered self-adjusting by springs 41, 43 threaded over a rod pivoted to the inner end of the bed, the adjacent ends of the springs abutting the turret 3. The bed supports an inflatable pad 23 comprising a rubber bag enclosed in leather, a double covering being, preferably, provided on the upper side. Above each bed is an arm 57 pivoted to the turret, a spring surrounding the pivot tending to raise the arm. The arm carries a heel pin 65 slidably adjustable longitudinally of the arm, a pin 69 on the heel end abutment engaging a slot in the arm. The toe part of the shoe is supported by a rubber roll 81, at an angle to the arm and similarly adjustable longitudinally, a clamping nut 79 being provided. The incline of the roll 81 is opposite on adjacent pressing devices, so that right and left shoes may alternate in the machine. A pivoted stirrup 89 engages the upper side of the arm 57, which upper side is eccentric to the pivot 87 in the operative position of the arm. A slightly flexible pipe 45 leads from each pad to the valve casing 95. Each pad has a waist pad 177 secured to links 181 so that it may be removed from operative position when not required. To the turret is secured a ratchet wheel 157 co-operating with a pawl 165 and formed with six equidistant holes for engagement by a plunger 127 mounted in a bearing in an arm 125 secured to the valve stem 15. The plunger is spring-pressed upwardly and provided with a head 135 co-operating with an arm actuated by a treadle-operated rod 161 which withdraws the plunger when the treadle is depressed. The plunger is also connected to the piston rod 137 of a cylinder 149 pivoted to a bracket on the frame. A spring 145 urges the arm 125 in the direction opposite to that in which it is moved by the piston. A flexible pipe 151 connects the cylinder with a ring 153 secured to the valve stem 15, a plunger valve 155 on the pipe line being actuated by stops 175, 171 at the extremes of its travel. The stop 171 is advanced by a lever 169 connected by a spring and a rod 167 with the treadle. The valve stem 15 carries a compressedair supply pipe 111 and an exhaust pipe 121. Ports in a conical valve head in the casing 95 are so arranged that the pipe 45 of the press at the operator's position is, normally, open to exhaust, and that press to his left is open to the pressure line. In operation, the pad at his position having deflated, the operator slides the stirrup 89 inwardly, when the arm 57 rises to allow the operator to change the work piece and re-position the arm 57 and stirrup 89. The operator then depresses the treadle, withdrawing the plunger 127 and allowing the spring 145 to retract the arm 125, 60‹. The valve 15 moves with the arm, with the result that the pad of the new work piece is inflated, and that to the operator's right is deflated. As the operator releases the treadle, the stop 171 advances to open the valve 155 to the pressure line, when the piston rod advances the turret one step, the arm 25 then contacting with a leaf-spring 173 or a spring- buffer. To allow the plungef 127 ample time to engage the next hole ia the ratchet 157 the initial movement of the piston 141 is slow, a branch pipe of small diameter opening close to the end wall of the cylinder and a full bore pipe opening into the cylinder say one quarter of its length. from the end wall. A work-holding rack extends across and above the machine at about breast height and facing the operator. The rack may comprise a single shelf tilted somewhat downwardly.