Patent GB-795764-A (GB)
Title: Improvements in or relating to sole rounding machines
IPC: A43D87/00
Filed: 1956-09-24
Abstract: 795,764. Sole rounding machines. BRITISH UNITED SHOE MACHINERY, CO., Ltd. Sept. 24, 1956 [Sept. 26, 1955; Sept. 26, 1955; April 23, 1956], No. 29059/56. Class 17(1) A sole rounding machine having a cutter head and a shoe support which are relatively movable so that the cutter progresses around the periphery of the shoe, has means for relatively positioning the cutter head and the shoe to control the width of sole margin to be left by the rounding cut. The latter means comprises; (1) a gauge 26 having wing elements 28, 30 mounted on the cutter head for relative movement between extended and collapsed positions (shown in dotted lines and full lines respectively in Fig. 6), with means to effect this movement at predetermined stages of the operation and (2) a guide mounted on the cutter head for yielding movement into.engagement with the side of the upper within the crease, with means to prevent movement of the guide at a predetermined stage in the operation. The wing 28 has a hollow shank 34 rotatable in the shank 36 of wing 30 which is in turn rotatable in slide 38. The latter is urged rearwardly by spring 42 to engage roll 44 with cam 46 which controls the lengthwise movement of slide 38 with gauge 26 to vary the spacing between the gauge and cutter 10, and so vary the width of sole margin as desired. The initial position of slide 38 is adjusted by screw 54 which adjusts the lengthwise position of roll 44 relative to the slide. The elements 28, 30 are swung between the extended position, in which they form a concave gauge for engaging convex portions of the shoe, and the collapsed position, in which they form a convex gauge to engage concave portions of the shoe, under control of a cam 128 which acts via 126, 124 &c. to rotate arms 92, 92a, Fig. 5, which through pin 86 plunger 84, bar 82, and plunger 78 adjust the heightwise position of pin 76 engaged in opposed oppositely inclined slots 72, 72, 74, 74 in the rotatable shanks 68, 70 of arms 66, 64 linked at 62, 60 to elements 30, 28. Pin 76 holds elements 28, 30 in their relative positions even if the shoe causes arms 64, 66 to swing, plunger 78 then rotating on its pivot 80. Washers 105, 105a (not shown), form antifriction bearings. Anvil 16 is recessed to form shearing edge 135. The welt support 18 is secured to a carrier 140 movable forwardly and rearwardly of the cutter head, the support being movable forwardly and rearwardly of anvil 16, and biased forwardly, to engage the shoe, by spring 152. Therefore as gauge 26 is moved the shoe permits corresponding movement of support 18. The support is locked relatively to anvil 16 so as to act as a crease guide, particularly at their inner shank, where gauge 26, because of an abnormal shape of shoe, would cause the cut to be too close to the upper. This locking of guide 18 is brought about by cam 154 which acts via 156, 160, 164, 178, and 172 to straighten toggles 182 which move brake shoes 158 to engage and lock carrier 140. Excess yielding movement of bar 164 is permitted by pin 174 and slot 176. Spring 170 returns bar 164 &c. The position of roll 156 lengthwise of bar 164 is adjustable. In a modified construction provision is made for occasions when control by guide 18, as described above, would still result in the margin being too small. In this construction the guide 18 has limited movement in its carrier relative to the cutter, with such movement controlled by a cam via a roll which is adjustable forwardly and rearwardly of the guide, i.e. to be in the path of the cam to a greater or less degree. The adjustment is such that the cam moves the guide only when the position of the guide is such that it would result in a margin of less than minimum width. Specification 795,097 is referred to.