Patent GB-630061-A (GB)
Title: Improvements in or relating to the manufacture of insoles
IPC: A43B13/39
Filed: 1947-12-18
Abstract: 630,061. Insoles. BRITISH UNITED SHOE MACHINERY CO., Ltd. Dec. 18, 1947, Nos. 33387, 33388. [Convention dates, Dec. 19, 1946], and 33389 [Convention date, Jan. 31, 1947]. [Classes 17 (i) and 17 (ii)] An insole similar to that described in Specification 153,085, [Class 17 (i)], comprises a body layer 544, Fig. 29, and an all-over layer 532 of stiffened canvas cemented to it under pressure between platens 546, 548, a rib being formed in the canvas, by progressively tucking the canvas in softened condition into a groove 522 in a matrix 520, Figs. 16, 29 before it is cemented to the body layer 544. The rib may be reinforced by a core piece 536 introduced progressively into the groove with the canvas. Such core piece may be of rectangular crosssection and may be reinforced bv an L- shaped strip 542 formed integral with the core 536, or one limb of which is cemented to it, the other projecting at right angles and attached to the canvas. The matrix is of shape of the insole to be produced and about 1/32 inch smaller so that, after the combined layers 532, 544 have been trimmed all round, the insole is of the size required. The matrix has parallel opposite faces with a groove 522 in each face extending from one side at the heel breast around the toe to the other side at the heel breast and of shape and size appropriate to the rib to be formed, so that a mating pair of insoles may be made with the aid of a single matrix. A groove extends around the edge of the matrix at a predetermined uniform distance from the grooves 522 to locate the matrix in position in the tucking machine, and a tang 526 and pins 528 are provided to hold the canvas in position thereon while it is being progressively pushed into one of the grooves 522 by a tucking tool 120, Figs. 1, 10. This tool is reciprocated by a pitman 136 driven from a horizontal shaft 150 through an eccentric 146. The work is advanced below the tool 120 by a four motion feed foot 170 which engages the canvas on the matrix at each side of the fold formed therein by the tool 120. An extension 218 on the feed foot enables it to maintain contact with the work at all times whether the toe of the matrix is pointed or not, and an extension 220 at the rear of the foot 170 smooths wrinkles which may form in the canvas near the end of the operation when the core piece is about to be severed. The core P, Fig. 10, is fed from a reel 222 on a support 224 through guides 226 to feed mechanism in which is a groove through'which the core passes in a direction parallel to tucking tool slide 124. The feed mechanism comprises a toothed wheel 242, Fig. 10, which engages one side of the core piece and wheel 244 which engages the opposite side, both wheels being driven at same speed. A lever 268 is moved counter clockwise to operate a pawl 256 and advance the core piece while the feed foot 170 is advancing the work, length of core piece feed being preferably slightly greater than distance of work feed. The core is engaged by the feed foot 170 in its downward movement and forced into the fold. A compression spring 278 allows the passage of cores of different or non-uniform thicknesses. Auxiliary feeding means comprising a toothed feed wheel 300 employed or not at will of operator under control of a treadle is provided to engage the canvas while the tucking tool is withdrawn and advance it to prevent wrinkles at sharply curved portions of the matrix groove. Engagement of a stop or a trigger adjacent to it with the end of the groove in the edge face of the matrix, when the canvas and core piece have been tucked into the groove for its full extent, arrests the feed movement of the work and a treadle is then released by the operator to stop the machine. A curved knife 360 on a carrier 362 is automatically operated to sever the core piece in a plane substantially parallel to the upper face of the matrix. The knife may be operated at any time by means of a handle located near to operator's hand.