Patent GB-795886-A (GB)
Title: Improvements in or relating to machines suitable for trimming inseams of shoes
IPC: A43D49/00
Filed: 1955-07-23
Abstract: 795,886. Inseam trimming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). July 23, 1956 [July 23, 1955], No. 21380/55. Class 17(1). A machine for trimming the inseams of welted shoes has a rotary trimming cutter 20, means for guiding the shoe comprising a welt crease guide 50 and a rotary feeding member 48, and a rotary rib guide 52. The guide 52, which holds the inseam upstanding away from the bottom of the shoe, forms an acute angle with the horizontal considered in the direction of' workfeed, and is so shaped that it exerts an upward force against the rib as it rotates in contact therewith. To ensure that the inseam is trimmed uniformly above the stitches the shoe is moved away from the cutter axis when the thickness of work between guides 50 and 52 increases, and towards the axis when the thickness decreases, by a device 54 engageable with the bottom of the shoe. Feeding member 48 engages the upper face of the welt and is so adjusted that its axis of rotation 49 forms an acute angle with the plane of rotation of the cutter edge so that the welt is outstanding when the inseam is presented to the cutter. The cupshaped knife 20 may have a scalloped edge, is rotated clockwise when viewed in the direction of feed, and, in known manner, is adjustable axially and heightwise, and sharpened by a grinding wheel 28. Wheel 48 is joumalled in a member 56/60 which has a rib and groove engagement with a platform 62, and is adjusted angularly by means of bolts 68 in slot 66 to give the required relationship between the axis 49 of wheel 48 and to the plane of the cutter edse, the setting being indicated on a scale. The rotary drive for wheel 48 is maintained, whatever its angular adjustment, by means of a self-adjusting universal joint 90, 92. The welt crease guide 50, normally held in operative position by spring 104, is released by depression of treadle 106 which acts through lug 114 and lever 110, from which it is normally slightly spaced, to rotate lever 100 counterclockwise (Fig. 2). The space between guide 50 and wheel 48 is adjusted initially by screw 115 which determines the initial position of lever 110. Guide 52, shaped as shown, is mounted adjacent the lowest point of the cutting edge of the knife 20 at the bottom of a bracket 122 which is pivoted on sleeve 124 and adjustable therealong by means of a handwheel 132 to adjust the guide relative to wheel 48 and the knife edge. The guide is also adjustable vertically by means of a clamp slide 150. The shaft of guide 52 is rotatable anticlockwise, Fig. 3, by gears 172, 174, &c., and forms acute angles with the axis of rotation of knife 20 and the plane of its cutting edge. The pivotal position of bracket 122 is controlled by engagement of a spring detent 192 on a lever arm 190 pivoted on sleeve 124 in one of a series of holes 194, 196, 198 in a plate 200 fixed to the bracket, so that the bracket is held respectively in operative position, in inoperative position for adjustment of the feeding mechanism, and.in a further removed inoperative position to permit replacement of the knife. Guide 52 is normally held in operative position adjacent wheel 48, but not touching the bottom of the insole, by a spring 206 acting through arm 190, but is pivoted away from the wheel by depression of treadle 106 to which arm 190 is adjustably connected. The depth gauge 54 is adjustable horizontally on a knife guard 210 which is adjustable lengthwise of bracket 122 and knife 20, and ensures that the shoe remains horizontal during trimming. Spring 206 permits guide 52 to yield when a thicker portion of the inseam is encountered, and gauge 54 moving with guide 52 on bracket 122 moves downwardly, as well as to the left, and depresses the shoe so that damage is prevented at such thickened places, where the curved stitches emerge at a higher level than they do where the inseam is thinner. A reverse movement occurs when a thinner part of the inseam is encountered. Specifications 112,808 [Class 17(i)] and 543,368 are referred to.