Patent GB-139242-A (GB)
Title: Improvements in machines for sewing incandescent mantles
IPC: D05B1/02
Filed: 1918-12-10
Abstract: 139,242. Embree, H. Dec. 10, 1918. Incandescent-lamp-mantle sewing machines; threadcutters and thread - end holders; needle-threaders.- Relates to machines for sewing incandescentmantles, and consists in the provision of automatic means, for feeding and severing the thread, carrying the severed thread portion to the needles and threading the ends theret h r o u g h , automatically turning up the mantle edge, and pleating the edge for the passage of the needles. The thread 208, Figs. 1 and 5, passes through eyes in a fixed bracket 201 and a slide 215 carried thereby, and is held by a spring finger 221 with ratchet teeth. The slide is actuated by a spring-controlled lever 239 supported by an arm 222 journaled on the main shaft 6. The arm 243, which carries the clamping- jaws for picking up the end of the thread, in its forward movement actuates the end 238<x> of the lever and moves the slide forward to present the end of the thread to the jaws. At the same time, the thread - cutter 210, pivoted on the bracket, is raised above the thread aperture by a rod 234 actuated by a cam on the main shaft. The thread. clamping jaws consist of a member 266, Fig. 25 pivoted to the arm 243 and controlled by a spring 275 and spring detent 272. The other member 265 is carried by a slide which is provided with a pin 289 and is acted on by a spring 290. When the arm 243 is swung across to the thread-end. holding device, the spear end 295 of a spring-controlled lever 293 enters between the pin 289 and a fixed pin 287 separating the jaws to receive the thread. When the pin passes the end of the speal head, the jaws close on the thread, and, in the return movement, the pir. 289 rides over the bevel 297 of the spear head. The thread is carried across to the other side by the jaws, and the detent 272 released by a fixed cam-surface, allow. ing the jaw 266 to move on its pivot by the spring and release the thread. In a subsequent initial movement, the detent is reset by another fixed cam. The thread is laid in two adjustable spring clips 378 and severed by the knife 210. The thread, in its passage from one side of the appara. tus to the other, is placed between two jaws 314, 321 which are carried respectively by members 309, 311 mounted on a slide 305 reciprocated from the cam shaft through the arm 360 and link 357. The member 309 is a lever which is swung by cam-abutments, and the member 311 is a spring. controlled slide acted on, in the movements of the slide 305, by fixed abutments to receive and close on the thread. The jaws carry a loop of the thread downwards longitudinally of a carrier 337 the legs of the thread-loop passing along guides 338, 339 and through eyes 343<x>, 344<x>, Fig. 28, in a bar carried by a spring 343. The carrier is then rotated on its axis 336 by a rack-and-pinion device actuated from cam shaft, to lay the thread ends in position tc be taken by the needlethreading devices, which consist of pairs of spring fingers 195, 196, Fig. 16, carried by a block 182. The block is reciprocated by a link connexion with a rock-shaft actuated by gravity and controlled by a cam, to project the fingers through the eyes of the needles 30, which at this time are in their forward position in recesses 187, 188 in a fixed block 184. The fingers open out above the needles, and receive the thread-ends, on which they close on their return passage. The pleating and hemming devices comprise the pleating-head of which the main portion 37, Figs. 1 and 12, which is recessed at 41, is connected to a fixed bar 39 by spaced pillars 40; the pleating-fingers 81 - - 88 secured to rocking shafts 77, 78 actuated by rack- and-pinion gear from the cam-shaft; plates 128, 129 pivoted in shouldered recesses in the pillars 40; and hooked fingers 199 which are carried by bars 71 rocking on slides 54 carried by a crosshead 53. The plates 128, 129 are rocked to grip the edges of the mantle by a vertically-sliding bar which has a slotted head engaging inwardly-projecting arms on the plates and is actuated from the cam shaft bv a yoke member 142. The bars 71 have inwardly-extending crank-arms engaging sockets in a cross-head 6@, which is moved vertically by link connexions with cranks 103, 104 on a cam-actuated countershaft 100, first to engage the hooks with the mantle above the plates 128, 129, and then to pull it down with the edge inturned, as shown in Fig. 21. The in turned edge is then pleated by the fingers 81 - - 88 advancing between the pillars 40 in the usual manner, so as to place the eyes 47, 48, 94, 95 in alinement. The intermediate nngers 87, 88 are resiliently connected to the shafts, the others being rigidly connected thereto, and are slightly longer than the others, so as to come first into contact with the mantle and draw the material towards the centre. The fixed arms on either side then engage the mantle and steal some of the material from the centre to form the pleats and aline all the eyes- The needles are secured to a block 16 which slides on guide-rods 14, 15 and is driven by a pin-andslot connexion with a cam-actuated lever 10. The needles pass through holes in a guide-plate which is slit diametrically of the holes to allow expansion when the enlarged parts of the meddles pass, and are pressed on by a spring finger 31. The cam shaft 6 from which all the working movements of the parts are desired is actuated by tha handle 7. In the modification shown in Fig. 32, the pleating-head 37 is replaced by a head 382 suitable for sewing upright mantles which do not require to be hemmed. The head is carried on long rods 386 passing through the bar 51 and screwed into the movable bar 61. The folding- fingers are removed, and the acting parts are so timed that the head, with the mantle, is raised clear of the working parts when the thread has been drawn through the mantle.