Patent GB-975711-A (GB)
Title: Improvements relating to the 'rounding' of footwear soles
IPC: A43D87/00
Filed: 1962-09-05
Abstract: 975,711. Rounding shoe soles. A. J. TATTERSALL. Sept. 5, 1963 [Sept. 5, 1962], No. 33938/62. Heading B4B. [Also in Division B3] A shoe-sole rounding machine comprises platens 18, 19, for clamping one or more soles to a templet 48, an arm 11 carrying the soleclamping means and manually movable about a first fixed axis, a power driven cutter 46 or abrasive wheel rotatable about an axis parallel to the first axis, a follower roller 44 coaxial with the cutter or wheel and engageable with the templet 48 to control the depth of cut when the sole or stack of soles is advanced against the cutter or wheel by movement of the arm, and manual means, including a handwheel 38, to rotate the clamping means 18, 19 and associated sole or soles about an axis parallel to the two fixed axes. The arm 11 is swingable about the axis of a vertical shaft 9, and the platents 18, 19 are carried respectively at the adjacent ends of two coaxial shafts 16, 17; the upper shaft 16 is movable downwardly against a spring 27 by an air cylinder 24 and the lower shaft 17 is normally urged upwardly by a spring 29. In operation, a stack of oversize soles 47 are sandwiched between a plastic or metal templet 48 and a plate 51, the plate and templet being located by co-operating pegs 53, 49 and holes 52, 50 on the upper and lower platens 18, 19 and templet 48 and plate 51 respectively. Operation of the air cylinder then results in clamping of the soles together with a lowering of both platens, resulting in simultaneous disengagement of the initial locating means for the upper and lower platens (i.e. a notch 28 and feather 22 and a notch 30 and fixed dog 32 respectively) and so freeing them for rotation. The arm 11 is then swung manually to engage the soles with the cutter 46 or abrasive wheel, and pressure is maintained until sufficient material is removed for the templet 46 to engage the freely-rotatable follower roller 44. The handwheel 38 is then rotated so that the sole assembly is rotatably driven via a shaft 37 and a disc clutch 33, 31 until the soles are trimmed to the shape of the templet 48. The dust produced is extracted from the cutter via a cowl 54, and is removed from the follower roller by a scraper blade. The arm 11 is then withdrawn to its original position and held there by a catch 56, and operation of a pedal 57 releases the pressure in the cylinder 24, and the top plate 51 is separated from the stack of soles 47, when the shaft 16 rises under the influence of the spring 27, by spacing the pegs 53 differently from the holes 52 and mounting one of these pegs resiliently, as at 58. Suitably shaped cutter-teeth permit grooving or bevelling of each sole in a stack, and the single cutter 46 may be replaced by two thinner elements to permit different treatment of sole and heel portions. The swinging arm 11 can be raised and lowered for the latter purpose, and is controlled by a manual valve 59 admitting compressed air to a cylinder 10 beneath the pivot shaft 9 of the arm 11, and the upper limit of travel is defined by an adjustable stop 60 for the pivot shaft 9. Instead of using compressed air for operating the clamping means and arm 11, hydraulic pressure or electromagnetic means may be employed.