Patent GB-191020744-A (GB)
Title: Improvements in or relating to Welt Shoe Preparing Machines.
Inventor: PLANT THOMAS GUSTAVE
IPC: D05B15/00
Filed: 1910-09-06
Granted: 1911-09-06
Abstract: 20,744. Plant, T. G. Sept. 6. Boot-sole sewing m a c h i n e s ; tackextractors. - A lasted boot is prepared for welting by a sewing - machine which removes the lasting- tacks and secures the upper to the insole by basting stitches. The tackextractor comprises two jaws 103, 113. T h e former is fixed to, and the latter is loosely mounted upon, a rod 101 mounted to turn within a hollow carrier 100, which is pivoted upon a radius arm 98. A rod 104 is secured to an arm 102 on the rod 101, and the rod 104 is engaged by a yoke 106 pivoted on a lever 108. The rod 101 and carrier 100 are moved lengthways by an eccentric rod 130. These parts are operated from a sleeve shaft 94, which is driven through a clutch such as that described in Specification 10,809/07, [Class 17, Boots &c.], which is rendered inoperative when one clutch member is held from rotation. When the machine is at rest, the part of the clutch integral with a lug 144, Fig. 8, is held stationary by a catch 143 resiliently mounted on a lever 142. This is removed by the operation of the starting treadle, and the shaft is then rotated for about one-quarter of a revolution until the lug 144 is detained by a catch 151 on a lever 149 which has been raised into operative position during the rotation of the shaft 94 by an eccentric 153 upon it. This movement of the shaft 94 brings the tack-extractor into the position shown in Fig. 7. The jaw 113 lies near the work, and as the work is fed it is engaged by a tack and moved with it. An arm 115 integral with the jaw 113 thereupon rotates a lever 118, and thereby moves a rod 126, Fig. 8, to the left; this removes the eccentric rod 154 out of engagement with the lever 149 and allows the latter to move downwards. The lug 144 being released, the shaft 94 rotates through another revolution until the lug 144 is detained again by the catch 151. In this revolution, the lever 108 is moved downwards, closing the jaws upon the tack and then swinging the whole about the pivot 99, thus drawing the tack. The eccentric rod 130 then moves the whole rearwards while the upward movement of the lever 108 opens the jaws. Finally, the parts are returned to the position shown in Fig. 7. The back gauge 83 has a central aperture through which the extracted tack drops. When the starting- treadle is released, the catch 143 moves back into the path of the lug 144, and a pin 162 secured to the lever 142 engages with a lug 163 on the eccentric rod 154 and moves this to release the lever 149. Thereupon, the shaft 94 rotates until the lug 144 is arrested by the catch 143, and in this rotation the tack extracting- jaws are moved away from the work. Feed by presser-foot. - A feeding point 64 is carried by a vertical rod 65, which is given vertical and rotational movements to effect the feed. Chain - stitching; needles, hook, threading- devices, for.-A looper 29 is secured to a sleeve 37 revolubly mounted in the machine head. Axial movement is imparted to the sleeve by a spindle 30 fitting within it and jointed to a camlever 33. The sleeve is oscillated by a cam-lever 42 having a laterally-extending pin 40, which slidingly engages with a slotted arm 38 fixed to the sleeve. Stopping-gear, non-automatic.-The machine is fitted with the driving clutch and associated gear described in Specification 17,857/08.