GB1275287A - Apparatus for roughing the overlasted portions of the bottoms of shoe uppers - Google Patents

Abstract

1275287 Boots &c BATA SHOE CO OF CANADA Ltd 3 June 1969 [3 June 1968] 27923/69 Heading A3B In a machine for automatically roughing the overlasted margin of a shoe of the type in which the shoe is moved past a pair of rotary roughing tools 2, the longitudinal and transverse angular relationship of the tools 2 are automatically varied at selected points in the roughing cycle and the pressure exerted by the tools 2 is automatically varied during the roughing cycle. Each tool 2 is mounted in a frame 22 for rotation about a transverse axis under the control of pneumatic cylinder 21 and the frame 22 in turn is mounted for rotation about a longitudinal axis under the control of pneumatic cylinder 30. Cams (not shown) on the last carrier control the cylinders 21 and 30 so that each tool assumes its correct longitudinal (Fig. 4) and transverse positions with respect to the shoe bottom. The tool carriers are mounted on slides 14 which can slide on vertical rods 4 and which are connected via a rocker to counter balance cylinders 46. The cylinders 46 can be connected to air at high, medium or low pressures so that the tools can exert low pressures in the toe region 38, high pressure in the shank region 40 and medium pressure in the heel region 42. The pressure is again controlled by cams (not shown) on the last carrier. The heel of the last 62 (Fig. 9A) is correctly positioned heightwise by mounting the last 62 on a spring loaded last pin 94 and depressing the heel by piston rod 122 until the last is in its correct position. The last is held in this position by a ratchet 106 and pawl 108 which is released by a cam 112 at the end of the roughing cycle.