Patent GB-464742-A (GB)
Title: Improvements in or relating to method and apparatus for making handkerchiefs and like articles
IPC: D05B25/00
Filed: 1936-08-29
Abstract: 464,742. Sewing - machines; web feeding, cutting, and edge - folding apparatus. JACKSON, L. I\IELLERSI-I-. (International Handkerchief Manufacturing Co.) Aug. 29, 1936, No. 23712. [Class 112] [Also in Groups VIII and XVI] Handkerchiefs, sheets, towels, bags, &c. are made from a continuous web by drawing the end of the web across a table, creating a slack part in the web so that a predetermined length is cut off by a cutter without relative adjustment of the cutter and feeding means, folding the raw edges of the blank so formed and feeding it to a pair of sewing machines ; means are provided for stopping each machine when it has sewn an article, and for stopping the whole apparatus in the event of a thread breaking. Fig. 49 illustrates the sequence ; the web W, having its edges already hemmed, has a part B separated therefrom, the part B being then fed in a transverse direction and having its raw edges folded and sewn. The web is fed by means of grippers 92, Fig. 10, which are reciprocated by camoperated members 76 and are opened by connected levers 104, 106 operated by a cam 96 and linkage 98, 100. The slack part of the web is produced by a bar 122, Fig. 13 carried by links. 120 operated by links 126, 128 between which is a pin-and-slot connection to vary the throw of the bar 122. The web is then gripped by a cam-actuated gripper 158 and cut by a knife 174; the latter slides in guides 178 and is carried on an arm 180, Fig. 18 pivoted on a lever 182 which is reciprocated by a cam 184 and links 186, 188, 190, 192. Springs 194, 195 secure a snap action in both directions of movement of the knife which is rotated by a belt 197. The raw edges of the separated piece of web are then gripped by members 136, Fig. 42 which co-operate with shoulders 202 fitted with blades that move inwardly to turn the edges over. The members 136 are carried by connected links 138, 138<1>, Fig. 15, operated from a cam 146 by a link 148, and the folding blade members are operated by cam-actuated members 214. The blank is then moved towards a pair of sewing machines by means of spring influenced grippers 252, Fig. 20, carried by reciprocating racks 240, the grippers being released for the return stroke by means of rods 256 engaging the grippers and operated by linkage from a cam 268. The grippers carry the edges of the blank through fixed folding devices sections of which are shown in progression in Fig. 25 ... 30. The folded edges are then taken by feeders 292, Fig. 35 and fed to the pressed feet 290 of the sewing machines. The feeders are reciprocated longitudinally and vertically from cams 302, 310. Each machine is fitted with stop gear consisting of a feeler 339, Fig. 36 which drops at the end of a sewing operation and closes a circuit which effects the operation of a clutch by means of a rod 328 controlled by an electrically operated latch. Fig. 39 shows means for stopping the machine in the event of the thread breaking. The thread passes over a lever 370 which falls on breakage and closes a contact effecting the operation of a latch 374 thus releasing a plunger 376 and throwing out a clutch 24.