Patent GB-621331-A (GB)
Title: Improvements in or relating to machines for performing a finishing operation on a marginal portion of an unattached shoe sole
IPC: A43D95/22
Filed: 1947-02-19
Abstract: 621,331. Finishing edges of unattached soles. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Feb. 19, 1947, No. 4746. Addition to 550,285. [Class 17 (i)] [Also in Group VIII] A machine according to the parent Specification for edge-setting and/or edge-trimming unattached soles is modified in that, while the edge of the sole is pressed against the feed wheel by a spring which is effective at all times, the means for supplementing the pressure in accordance with the excess of sole thickness above a predetermined amount comprises a second spring brought into operation by movement of the feed wheel away from the supporting surface of the work support during feed of the work. The illustrative form of machine has a work-supporting table 26, Figs. 1, 2, 3, which is normally horizontal but may be secured in a tilted position relatively to an edge finishing tool when it is desired to form a bevelled edge on the sole. A rotary finishing tool 20 is mounted on a vertical shaft 78 and is driven through a main driving shaft 52 from an electric motor mounted on the machine frame. A work feeding wheel 22 is set at an angle to'the direction of feed of the work past the tool on a substantially horizontal axis extending forwards and rearwards of the machine at one side of the tool. An edge gauge 24 is mounted on a vertical axis which is rearward of the point of engagement of the wheel 22 with the sole and which is adjustable to pass through or to one side or other of the axis of the wheel so that the components of feed-force against the sole edge and in the direction of feed may be varied. The gauge 24 is carried at the outer end of a lever 168 pivoted on a screw 164 adjustable in a slot 162 in a lug extending from a yoke shaped frame 116 which is pivoted on trunnions 114 carried on a bracket 102 adjustable horizontally on the machine frame. The other end of the lever 168 is clamped by a screw 172 extending through an arcuate slot 170 concentric with the screw 164 so that the gauge' 24 is adjustable to and from the tool 20 independently of the movement of the feed wheel 22 to or from the tool 20. The tool 20, wheel 22 and gauge 24 are all mounted on a single carrier 34 which is adjustably mounted on the machine frame 30 in such manner as to permit the driving shaft 68 on which the wheel 22 is mounted to swing up and down about the trunnions 114 in accordance with variations of sole thickness. For this purpose, the shaft 68 is mounted on a sleeve 118 in the frame 116 and is connected by a universal joint 64 to a driving shaft 60 which is driven through a gear box and main driving shaft 32 from a motor in the machine frame. A sharpening device for the teeth of an edge trimming tool for use in the machine may also be driven from the machine motor. A pair of compression springs 124, 126 are mounted in parallel bores in a boss 128 on a plate 100 attached to an arm 94 carried by a bracket 86 on the carrier 34, and means are provided for adjusting their respective pressures against plungers 132, 136 which bear respectively against vertically adjustable abutments 148, 152 so as to hold the wheel 22 yieldingly against the work. The abutment 148 is set so that the plunger 132 causes the wheel 22 to engage even the thinnest part of the sole while the abutment 152 is adjusted to occupy a lower position to avoid engagement with the plunger 136 except when the wheel 22 bears upon a portion of sole of greater thickness than a predetermined amount. A stop screw 154 limits downward movement of the wheel 22 when there is no sole on the table. The tool 20 is heated by an annular electricallyheated element 204 positioned below and coaxial with it.