Patent GB-191229753-A (GB)
Title: Improvements in or relating to Mechanism for Supporting the Work in the Manufacture of Boots and Shoes.
IPC: A43D89/00
Filed: 1912-12-24
Granted: 1913-12-24
Abstract: 29,753. Jerram, A. E., Gouldbourn, J., Woodcock, R. B., and British United Shoe Machinery Co. Dec. 24. Boot-sole sewing machines; fair-stitching.- The last-pin C of a work-support for use in machines for operating upon boots and shoes such as levelling, stitching, nailing, or edgesetting machines, exemplified by a sole-levelling machine of the type described in Specification 10,883/95, [Class 17, Boots &c.], is mounted on a carrier C' supported at its forward end by a rod C<3> pivoted at C* to the carrier and at its rear end by a link L, which is pivotally connected to one end of a lever K fulcrumed on an arm B'‹. The arm B<10> is an extension of a toe-rest supporting- post B<3>, which is pivoted at X on the frame of the machine and carries a toe-rest B normally pressed upwards by a spring B<4>. A rest D for engaging the bottom of the last at the heel end of the boot is carried by an arm D', which can turn on a pivot Y mounted in a lug B<9> extending from the toe-post B<3>. The rest D is moved to engage the heel and to move the shoe into jacked position by connexions from a hand-lever E pivoted at E<2> upon a member K, itself pivoted at K<1> upon the lug B<10> extending from the toe-rest post B<3>. The hand-lever E, is connected with a link H, which is attached at its end to a lever I pivoted on the arm D<1> carrying the rest D. The lever I is held raised bv a spring plunger D<2> in a casing on the arm D' so that ratchet teeth P on the lever I are normally clear of teeth on a segment J. To jack the shoe, the lever E is raised from the position shown in Fig. 1 and turning about the pivot E<2>, through the connexions H, I, causes the rest arm D<1> to turn about its pivot to engage the heel and to force the shoe towards the toe-rest. The forepart of the shoes passes under a height gauge (not shown), which presses down the toe, the rod C<3> sliding in its lower support to permit this movement. When the toe-pad B is engaged, it is also depressed against the pressure of the spring B<4>. After the shoe has been forced to its furthest forward position, the spring plunger D<2> yields, and the arm D' is locked in position by the teeth I<3> engaging the rack. The lever E then turns about the pivot H<1>, thus moving the lever K and so forcing upwards, through the connexion by the link L, the rear end of the last until it is pressed firmly against the rest D. At the beginning of this movement, the toe-pad B is locked against further downward movement. The lever E and the lever K are then locked in their final position as shown in Fig. 2 by a pawl operated from and supported on the lever E engaging a rack on the lever K. The rod C<3> is locked in position to support the forward end of the last as the jacked shoe is moved bodily forward to position under the levelling-roll G by the device shown in Fig. 4. The rod C<3> passes through a clamping-block C' mounted on the pivot Y. A spring C<5> tends to elevate the rod as far as a roll C", which engages an inverted V-shaped cam on the rest-arm D', will permit. A clamping-member C<6> pivoted in the block C<4> is provided with an arm C<8>, which carries a roll engaging a cam-surface formed on the machine frame. The cam-surface is so shaped that, before the jack is moved bodily to carry the shoe below the levelling-roll, the clamp is inoperative, but as the jack moves a spring pulls down the arm C', causing the clamp to grip the rod. In a modified form, the rod C<3> is provided with a rack gearing with a pinion on a shaft. The rod is normally pressed upwards by a spiral spring and is adapted to be clamped as the jack is moved to the operative position by a fraction brake engaging a disk on the pinion shaft.