Patent GB-635430-A (GB)
Title: Improvements in or relating to pulling over machines
IPC: A43D13/00
Filed: 1948-04-09
Abstract: 635,430. Pulling over machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and KESTELL, T. A. April 9, 1948, No. 9937. [Class 17 (ii)] Foredraw is applied at the end during an assembling operation of a shoe upper loosely mounted on a last carried on work-supporting means, before the toe end pulling-over gripper is operated. This may be done by a pair of auxiliary grippers, one on each side of the toe end gripper, which pull on the margin of the upper and facilitate its entry within the open jaws of the toe end and side grippers. As soon as the toe end gripper has closed on the upper, the auxiliary gripper jaws are opened and then moved to an out of the way position, the toe-end and side grippers completing the pulling-over and lasting of the forepart of the upper as described, for example, in Specifications 396,086, 413,010, 550,831 and 621,710, except that the side grippers are arranged to commence to pull simultaneously with the toe end gripper instead of with the toe end gripper leading. In the form described, a pair of auxiliary grippers 11, Figs. 1, 2, one on each side of a toe end gripper 1, are slidably mounted on slides 19, for longitudinal movement relative to a' last mounted on a carrier 5, in guideways 21 in brackets 23 at equal distances from and close to the centre line of the machine. Each gripper 11 comprises a relatively fixed jaw 13 and a jaw 15 pivoted thereto, the jaws 13 being adjusted by adjusting the position of a stop cross-bar 155, in accordance with the scantiness of cut of the uppers, and so as to extend outwardly and downwardly in front of the machine at the level of the forward part of jaw 2 of toe end of gripper 1 when such gripper has been set to deal with shoes of a particular size. The position of the brackets 23, on ribs 20 on a bracket 25 between the brackets 23, is adjusted to position the workengaging surface of the jaws 13 at a desired heightwise relation relatively to the open jaws of the gripper 1. The grippers 11 are first closed, on depression of a treadle 87, through links 35, 39 and toothed segments 41 connected to the slides 19, which are prevented from moving longitudinally, until latching pins 95, one on each side of the slides 19, are released from engagement with stop faces 101 on plates 157 adjustably secured to the brackets 23. Such release occurs automatically, by the action of plates 167 secured to the segments 41, when the jaws 13, 15 are closed. A latch link 123, pivoted on one of the brackets 23, holds a cross-piece 57 which connects the forward end of slide bars 55 movable in guideways 53 in the outer faces of the upper portions of the slides 19 which carry the lower jaws 13 of the grippers 11, in its most rearward position, even though the treadle 87 is released by the operator, and is then pulled rearwardly of the machine, through springs 75, tension of which is adjustable, to impart foredraw to the upper and to present its margin to the jaws 2, 4 of the gripper 1. These jaws are shaped to accommodate shoe upper material pulled between them by the grippers 11. A tip line gauging device 32 is provided at the forward end of an extended portion of the bracket 25, and the toe end gripper bar has a hook member which is engaged by an adjustable member on the machine frame to restrain the last against lengthwise movement during the tensioning movement of the grippers 11. The latch link 123 which holds the grippers 11 in their tensioning position by engagement with the cross piece 57, may be released by a hand lever 152 if re-adjustment of the upper on the last is found to be necessary. The jaws of the grippers 11 retain their grip until the jaws of the toe-end gripper 1 close on the upper, when, by engagement of fingers 127 by a trip lever 129 on movement of the gripper bar of the toe end gripper 1, they are automatically opened and, by the action of the springs 75, moved rapidly to an out-of-the-way position determined by engagement of plates 71 with the forward end faces of the brackets 23. The grippers 11 are returned to their initial position after completion of a lasting operation by release of the latch link 123 from cross-piece 57 by a finger 165 located between the rear end portions of brackets 23, which is moved by an expander bracket assembly similar to that described in Specification 550,831. The auxiliary grippers 11 my be rendered inoperative, if desired, by withdrawing them to their rear; ward position and retaining them there by a latch 183 which is moved by the operator to engage a pin 185 on the lever 70 through which the grippers are normally operated. Specifications 12304/03, [Class 17], 2592/11, [Class 17 (i)] and 431,867 also are referred to.