Patent GB-991882-A (GB)
Title: Improvements in or relating to machines suitable for use in operating on marginal portions of shoe bottoms
Inventor: KESTELL THOMAS AUBREY
IPC: A43D37/00
Filed: 1960-08-12
Abstract: 991,882. Shoe bottom roughing. BRITISH UNITED SHOE MACHINERY CO. Ltd. Aug. 11, 1961 [Aug. 12, 1960; June 28, 1961], Nos. 27924/60 and 23331/61. Heading A3B. A machine for operating on marginal portions of shoe bottoms comprises a work support, a support for a rotary tool, means to rotate the tool, and means for moving the tool support relative to the work support so that the tool operates progressively along the marginal portions, the tool effecting a wiping movement inwardly from an outer edge across the marginal portion. The machine includes means to rock the work support about an axis extending longitudinally of the shoe so that the angle of presentation of the marginal portion to the tool is maintained substantially uniform. The plane of the work engaging surface of the tool is substantially normal to the axis of rotation which is inclined to the normal to the shoe bottom at the point of operation. Tool 20 is provided with a motor 220 and comprises an outer casing 222, two plates 226, 228 through which pass a plurality of wire roughing brushes 232, and a spindle 230. The angle at which the brushes 232 are presented to the work is variable by rotating plates 226, 228 with respect to each other. In a modified form the wire brushes are mounted at an angle to the axis of rotation of the tool, the pressure of the tool on the workpiece being variable by the introduction of a pressure fluid into a chamber of the tool so that at least part of the weight of the frame may be supported by the spindle. A lasted upper and insole are supported in an inverted position in the machine by a work support comprising a heel stop 64 and a toe clamping arrangement 62 (not shown). An adjustable mask 208 is also provided to define the area of operation of tool 20 in the waist region of the workpiece. A second work support is also described in which the clamping devices and mask are of different constructions from those of the first work support. The work support also comprises a bar 66 on arms 108 which are pivotally mounted at their upper ends to arms 110. The latter arms are pivotally attached by two links 112, 118 to plates 116 of the main frame of the machine. Link 112 is supported by a piston rod 124 of cylinder 126 so that when pressure fluid is introduced into the cylinder the work support will be moved vertically against tool 20. The lower end of bar 66 is pivotally connected at 70 to links 72, 76, 82 &c. which, through a cam follower and cam surface 57, rock the work support about an axis longitudinally of the shoe. Link 82 is adjustable in length through component 84 so that operations may be performed on different sizes of shoe. In a modification the vertical movement of arms 110 and thus the workpiece is controlled by links, a cam follower, and a cam. Cylinder 126 is also retained. The cams are mounted on a main shaft 60 of the machine. Tool 20 is secured on a post 22 which in turn is attached at its lower end to a shaft 24. Shaft 24 is supported by a plate 28 of a carrier 170 movable laterally of the machine in guideway 168. Guideway 168 forms part of a second carrier 132 which is movable longitudinally of the machine in a second guideway. Tool 20 pivots on shaft 24 by the action of a Bowden cable 32 on one arm 30 of a bell crank lever fulcrumed on shaft 24. Springs 38 and 42 resist the action of the Bowden cable 32. The motions of the two carriers 170, 132 and the Bowden cable are controlled by cams secured to the main shaft 60 and appropriate cam followers and links, the link to carrier 132 being adjustable so that the machine may accommodate shoes of different sizes. The main shaft 60 is driven by a motor through worm 198 and worm gear 200.