Patent GB-611972-A (GB)
Title: Improvements in or relating to machines adapted for lasting shoes
IPC: A43D25/053
Filed: 1946-05-15
Abstract: 611,972. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. May 15, 1946, No. 14618. Convention date, May 16, 1945. Addition to 585,121. [Class 17(i)] The wiper means of the parent Specification for laying the lasting margin of the tensioned upper on the shoe bottom is now made in the form of an endless driven flexible member, and the pressure of the lasting margin against the driven roll is now automatically relieved periodically, to facilitate the passage of thickened portions of the lasting margin of the upper. The presser member of the parent Specification also is modified to engage the lasting margin of the upper by a pair of angularly dished faces each pressed by spring means against the upper, and relatively yieldable to one another. In the illustrative form shown, the wiper comprises a continuously moving flexible narrow chain 16, Figs. 1, 2, 3, which engages the margin of the upper as it emerges from between the feed and upper - tensioning roll 10 and the presser member 12, and close to the member 12, so as to wipe the margin of the upper (or of a cover of a platform soled shoe) inwardly from the edge of the shoe with a component of motion in the direction of feed of the shoe. The member 12 is formed with two angularly disposed substantially flat operative faces which press the margin of the upper at two circumferentially spaced points against the roll 10. One of the points is substantially in line with the shoe edge and the other inwardly of it. These two faces are, in the form shown, arranged as separate elements 12, 14 independently movable away from the roll 10 against yielding means 122 Fig. 6, to permit passage of an upper which may vary in thickness e.g. due to overlapping parts. The margin of the upper, at least at the locality on the roll 10 which is adjacent to the shoe edge, may be momentarily freed from pressure, to permit the shoe to be turned sharply in a plane normal to the shoe bottom, where an abrupt change in the contour of the shoe bottom requires it, and without wrinkling the upper, by moving the member 12 automatically periodically away from the roll 10 by rapidly vibrating it. The hinged portion 14 of the member 12 remains in engagement with the upper inwards of the shoe edge so that the upper is not altogether freed from pressure. The roll 10 is secured at the lower end of a shaft 30 angularly adjustable relatively to a horizontal plane through the bottom of the roll about the centre and without altering the vertical position of the right hand side of the bottom face of the roll, and also towards and away from the wiping chain 16. The roll 10 is also movable rearwardly and forwardly of the machine relatively to the member 12 by vertical movement of a cam bar 62 operated by a treadle 152 against a spring 154. A main driving shaft 82 drives the roll 10 through a helical gear 78, idler gear 76, gears 82, reduction train 92, 94, 96 and shaft 98, which is connected to shaft 30 through an assembly 100. The body portion 12 of the presser member is secured by a bolt 110 to the lower end of an arm 112 mounted to permit adjustment laterally of the machine relatively to the roll 10. The hinged part 14 is pivotally mounted on the part 12 on a pin 120 and is urged anti-clockwise by the spring 122. A rod 130 is connected to the arm 112 and its other end passes through a hole in a bracket 140 secured to the frame 54 and a spring 148 bears against a bracket 140 and a collar 144 on the rod 130. The spring 122 is weaker than the spring 148, and the member 12 is adjusted relatively to roll 10 so that the part 14 will contact the margin of the upper just before the part 12. A four-pointed cam 160 on the shaft 30 is in alignment with a cam roll 162 at the lower end of an arm 164 pivoted to arm 112, and a compression spring 170 is interposed between the upper end of arm 164 and arm 112 to hold the arm against an adjustable stop screw 172, so that arm 112 is moved rearwardly by each high part of the cam 160 and the body portion 12 is thus moved slightly away from the roll 10, the part 14 maintaining its pressure against the work. The wiping chain 10 is carried in a housing 180, Fig. 2, and passes over a driving sprocket 192 on shaft 194 driven from a shaft 86. An edge gauge roll 18, Figs. 1, 2, is journalled on a stud carried by a block 212 mounted for adjustment forwardly and rearwardly of the machine and also laterally and vertically of it. A shoe bottom rest 20, Figs. 1, 2, 4, mounted on a bearing block 32 for angular adjustment about axis of roll 10, also is provided.