Patent GB-618641-A (GB)
Title: Improvements in or relating to the pressing of seams of work pieces
IPC: A43D55/00
Filed: 1946-11-07
Abstract: 618,641. Pressing seams in workpieces. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Nov. 7, 1946, No. 33060. [Classes 17 (i) and 112] In pressing a seam in a workpiece, such as a backseam in a shoe upper, tension is applied transversely of the seam before the seam pressing member acts on the material. The seam may be so fed as to present successive portions to seam pressing means, the material adjacent such successive portions being tensioned transversely of the seam prior to the pressing of the portions, or forces having components both along the seam and transversely thereof may be applied to the material while the seam is being fed to the pressing means. One form of machine comprises a high-speed seam-pressing roll 10 for pressing work against a work support 12, and the fluted periphery of which extends between a pair of work-engaging rolls 14, 16 which are driven at lower speed to impart to the work forces along the seam to feed the work, until it is engaged by the pressing roll 10, and transversely of the seam, to tension it. The work support comprises a stationary central disc-like member 172, which presses the work upwardly against the roll by the action of a spring 188 against an adjustable limiting stop member 198 set in accordance with the work thickness by a screw 202 threaded into a block 186 set at an angle and slidable in guides on the base plate of the machine frame, and a pair of side members 174, 176, each in the form of a frustum of a cone and rotatably mounted one on each side of, and co-axial with, the member 172. The work-guiding means comprise a seam ridge guide 18 which engages the opposite side faces of the seam being operated upon, a forward seam crease guide 20 arranged to engage the crease of the seam before it is operated on by the roll 10, and a rearward seam guide 22 for similarly engaging the seam after it has been operated upon. These parts are supported in a frame 26 having a base plate 34 and side members 30, 32. The seam ridge guide 18 comprises a pair of. spaced members 88, 90 (not shown) mounted for heightwise adjustment independently relatively to each other and also together, and their adjacent faces are shaped to form a work-receiving entrance between them by gradual approach to a parallel portion which bears on opposite sides of the seam ridge by yielding pressure of springs 122, 124. Such pressure is adjustable by moving plates 128 up or down. The forward seam crease guide 20 comprises a vertically adjustable blade-like member with convex upper edge, which centres the work in advance of the member 172 and is supported against lateral displacement. The rear seam crease guide is generally similar to it. To permit the machine to deal also with right and left shoe uppers having a tab extending from the upper portion of one of the quarters of the shoe upper as well as with shoes without back stay tabs, a three-position back stay tab guide 24, Fig. 8, of inverted Y-shape, is provided, to uncurl the tab and bend it down on the opposite quarter with its unfinished side uppermost out of the way of the rolls 14, 16, 10. The upper is presented to the machine inside out, and, by operating a treadle, a spring 156 associated with it is caused to hold the guide 24 in a neutral position with a knob 162 against a stop 160, when operating on uppers without back stay tabs. For operating on uppers with back stay tabs, the stop 160 is shifted to an inoperative position to permit the spring 156 to hold the guide 24 in one position, in which a guide member 136 is in workengaging position, for tabs which extend to-the left and, for uppers having tabs extending to the right the treadle is depressed to maintain the guide 24 against the opposite stop 144 with a guide member 140 in operative position. An M-shaped work support 240, on which the treated uppers may drop, is movable between limiting stop positions, in one of which the seam pressing operation is performed, and from the other of which the work, whether such consist of open or closed uppers, may readily be removed. Specification 422,560 is referred to.