Patent GB-525408-A (GB)
Title: Improvements in or relating to machines for operating upon the margins of boot or shoe soles
IPC: A43D43/02
Filed: 1939-02-18
Abstract: 525,408. Channelling-machines for shoe soles. BRITISH UNITED SHOE MACHINERY CO., Ltd., RICKS, F., and CHOICE, F. C. Feb. 18, 1939, No. 5444. [Class 31 (i)] A machine for channelling the margin of a shoe sole comprises an edge gauge which is adjusted by a step-by-step rotary cam member driven by a one revolution shaft, means being provided for varying in a predetermined manner the profile of the cam. The machine in general is similar to that described in Specification 13052/08, [Class 31], the gauge therein being operated by the present means which consists of a number of cam segments 19, Fig. 3 arranged on a drum 21 and adjusted by screws 39 to vary the contour of the cam. The drum 21 is carried on a hollow shaft 17 carried by and driven from the single revolution, main shaft 63 through reduction gearing 51, 53, 59, 61 whereby the drum is rotated one quarter of a revolution for each complete revolution of the shaft 63. The shaft 63 is driven from oppositely rotating pulleys 67, 71 through clutch members 73, 75 and a sliding tooth 77 carried by a block 81 on the shaft 63. The tooth 77 is formed on a slide 79 fitted with a projection 87 engaging in a recess in a slider operated by a triangular lever 95 one upper corner of which is pivoted at 97, Fig. 6, to a link 99 the other end of which is pivoted to the casing. The other upper corner of the lever 95 is pivoted at 103 to a link 105 the other end of which is likewise pivoted to the casing. The links 99, 105 are provided respectively with lugs 109, 113 engaged by pawls -111, 115 fitted with arms 125, 131 engaged by blocks 127, 133 on a bar 129 secured to a rod 135 pivoted to one arm 137 of a lever the other arm 139 of which is actuated by the operator's finger. Movement of the arm 139 thus effects the operation of one of the pawls 111, 115 to release one end of the lever 95 which is depressed by a spring plunger 145 and the slide 89 moved to engage the tooth 77 with the clutch teeth 73 or 75 to rotate the shaft 63. The shaft is fitted with a collar 147 having a pin 149 engaging in a circumferential slot in a cam member 153 operating a slider 159 en- .gaging an arm 163 of a bell-crank the other arm 165 of which engages a sliding rod 167 connected to an arm 173 of a bell-crank the other arm of which operates a lever 181. The latter is fitted with depending links 183, 185 for operating the links 99, 105 thus returning them together with the lever 95 to normal at the end of a revolution; by these means the slide 89 is returned and the tooth 7 moved to neutral. A brake shoe 197 engages an eccentric 195 on the shaft 63 and stops it as soon as the drive ceases. One of the links 183 is provided with a transverse pin which engages the bar 129 and lifts it so as to release the block 127 or 133 out of contact with the arm 125, 131. The pawl 111 or 115 is then returned and holds the lever 95 in its normal position. By these means the shaft is prevented from making more than one revolution if the operator inadvertently keeps one of the arms 143 of the lever 139 depressed.