Patent GB-404690-A (GB)
Title: Improvements in or relating to machines for winding electrical coils
IPC: H01F41/06
Filed: 1932-07-19
Abstract: 404,690. Winding electrical coils having insulating - material between successive layers. UNIVERSAL WINDING CO., 95, South Street, Boston, U.S.A. July 19, 1932, No. 20431. Convention date, April 9. [Class 120 (ii).] In a machine for winding electrical coils with sheet insulating material between successive layers, provided with measuring and severing devices for the insulating material and with means for delivering the material to the coil, the measuring-device operates by forming a loop of the material. The measuring- device comprises a bar 170, Fig. 15, adapted to be moved in a path more or less normal to the insulating-material S and of progressively increasing length according to the length of strip required to cover the layers so as to form a loop, and fingers 250 are arranged to grip the material at a position in advance of severing means constituted by a knife 205. Separate from and additional to the measuring-device, means comprising movable rollers 94, Fig. 6 are provided for withdrawing the material from the supply R. Feed rollers 115, 125, Fig. 15, rotated intermittently by ratchet gear arranged to raise the top roller as required to interrupt the feed, feed the insulating-material to delivery-means 225 which has two distinct movements, one vertical to register with the coil and the other horizontal towards the coil, the former being adjustable in accordance with the growth of the coil. A chart, Fig. 18 (not shown), shows the co-ordination and sequence of the operations. The coil-winding mechanism is the same as that described in Specification 395,386 preferably provided with an automatic counting and stopping apparatus as described in Specification 398,208. The wire w, Fig. 11, is wound into coils C on a tube t carried by an arbor 15 driven by a spindle 5 which drives the traverse cam 23 through a releasable worm 35 and gearing 36, 42, a crosshead 20 carrying the wire guides being reciprocated from the cam by a slide 27, which is connected to a slotted arm 32 carrying the traverse rod 22 and is reciprocated by the cam in a slotted arm 28 adjustable in a quadrant 33. The mechanism for inserting the strips is constructed as a complete unit carried by framework 55, 56, bolted to the frame 2 of the machine and supported by yokes 66, Fig. 6, from the floor. The main driving-element of the mechanism is a cam shaft 70 driven from the traverse cam shaft through coupling-members 80, 81, which are adjustable relatively to each other so that the operation of the mechanism may be correctly related to the traverse of the wire. The insulating-material is passed over a shelf 91, Fig. 4, and is withdrawn from the supply roll R by the rollers 94 carried by an arm 96, Fig. 4, oscillated by a cam 100, eccentrically mounted discs 111 preventing any reverse drawing from the shelf 91 while freely permitting the passage of the material to the feed-rollers 115, 125. The feedrollers are geared together and are driven by a gear wheel 140, Fig. 4, actuated by a pawl 145 operated by an adjustable rod 154 from a cam 148, the top roller being raised at the completion of the rotary movement by the engagement of a shoulder 147 on the pawl arm with an adjustable set screw 164 in a pivoted arm engaging with a lever 127 carrying the top roller. The lower feed roller is grooved to accommodate fingers 119, Figs. 15 and 16, of a guide plate 120 on a rest 62, which is provided with a blade 200 to co-operate with the knife 205 and with an additional support 214 for the insulating material. The knife 205 is carried by a lever 203, Fig. 4, connected by an adjustable rod 219 to a lever 215 operated by the cam 220. An upper guide plate 153, Figs. 15 and 16, is suitably spaced from the plate 120 and secured by screws 166, which are secured by nuts 168 and are adjustable in slots 161 to serve also as guides for the strips. The bar 170 of the measuring-device is carried by a lever 173 oscillated by a link 177, Fig. 6, lever 178 and a cam 180, and is moved into the position shown in Fig. 15 to allow the feeding forward of the strip S and then lowered to the position shown in Fig. 16 to form a loop of suitable length. The extent of the lowering of the bar 170 is governed by a rack 184, which supports the bowl of the lever 178 on a shelf 187 and is gradually lowered by a pinion 191 on a shaft 192 operated by ratchet gearing from a cam 293 on the shaft 70 so that the bowl, after each rise imparted by the cam 180, falls lower, whereby the length of the strip looped by the bar 170 increases according to the increasing diameter of the coil. The delivery means 225 is carried by levers 228, Fig. 11, mounted on pivoted arms 230, and comprises a platen 226, Figs. 15 and 16, a co-operating tension plate 243 sliding on pins 238, and pivoted fingers 250. When the measuring-bar 170 is raised it engages fingers 245 on the plate 243 so as to raise it to permit the feeding forward of the strip. When the measuring-bar is lowered the fingers 250 are released and hold the forward end of the strip during the forming of the loop. The movement of the delivery means towards the coil after severing is effected by the levers 228, Fig. 11, which are operated by a rod 328 and dog 337 which fits freely on the rod 328 and is carried by a lever 332 operated by a cam 335 The vertical movement of the delivery means necessary in order to present the strip to the coil is effected by the variable engagement of a rod 263, Fig. 9, operated by a cam 265 with a cam-face 261 on an arm 260 secured to the shaft carrying the arms 230. The extent of the elevation is governed by a cam 270 which moves the rod 263 towards the surface 261, and is mounted on the shaft 192 so that this movement is governed by the same ratchet mechanism which determines the stroke of the measuring rod. Specification 406,323 also is referred to.