Patent GB-555914-A (GB)
Title: Improvements in or relating to the manufacture of electrical condensers
IPC: H01G13/02
Filed: 1942-03-09
Abstract: 555,914. Winding coil condensers. DUBILIER CONDENSER CO. (1925), Ltd. (Dubilier, W.,) March 9, 1942, No. 3080. [Class 100 (i)] A machine for winding coil condensers of the kind comprising metal foil and insulating strips, comprises a head carrying two or more mandrels and rotatable to bring the mandrels in turn into a winding position, a device for severing the strips when a coil of predetermined size has been wound, means for guiding the strips to the mandrel in winding position and driving and control mechanism for automatically rotating the mandrel, severing the strips, rotating the mandrel head, and gripping the strips to the next mandrel, in the proper sequence. The mandrels each comprise two half mandrels in the form of bars of semi-circular section which are associated to form complete mandrels gripping the strips of material between them. One set of half mandrels 37, Fig. 3, is carried by a head 25, Figs. 1, 3 and 4, fixed to a shaft 24 and the co-operating half mandrels 37a are carried by bars 198 slidable in heads 193, 194 fixed to the shaft 24. The shaft 24 is intermittently rotated to move the mandrels successively into four positions A .. D, Fig. 4. The strips are wound into a coil at position A, and the foil strips, but not the insulating strips, are severed. In position B, the insulating strips are severed by a knife 168, paste is applied to the surface of the coil by a pasting roller 166 and the coil rotated to cause the end part of the strips to adhere to the boby of the coil. As the mandrel moves to position C, the mandrel part 37a is withdrawn leaving the coil hanging on the part 37 and at position D, a stripping finger 235 is engaged with the inner end of the coil and is moved to push the coil off the mandrel into a delivery chute 350. The bars 198 carrying the mandrel parts 37a are connected to springs 214 passing over pulleys 212 on a head 206 fixed to the shaft 24 and attached to another head 213 also fixed to the shaft 24. As the mandrel approaches position C a pin 219 on the head 25 rocks a shaft 221, Figs. 3 and 4 to cause a half nut fixed to the shaft to engage a lead screw whereby the shaft 221 is moved axially to cause an arm 228 fixed thereto to move the bar 198 against the action of the springs 214 as shown in Fig. 3, a pivoted latch 200 holding the bar in the withdrawn position. A second half nut on the shaft 221 is then caused to engage a second lead screw to return the shaft and arm 228 to its initial position. When the withdrawn bar '198 reaches position A, the latch 200 engages a fixed cam 204 to release the bar to allow the springs 214 to move the half mandrel forward again to grip the ends of the strips in readiness for the next winding operation. The shaft 24 is rotated one quarter of a revolution for each revolution of a shaft 68, Fig. 1, by a geneva gear 83, 84 and the shaft 68 is driven from a continuously driven worm wheel 67 loose upon it through a one revolution clutch comprising a pivoted pawl 73 held by a spring 75 in engagement with teeth 70 on a disk 69 fixed to the worm-wheel 67 and moved out of engagement with the teeth at the end of a revolution by engagement of a lug 76 on the pawl with the armature of an electromagnet. A shaft 90 driven by chain gear 91 from the shaft 68 carries a cam which, just after the movement of the shaft 24 which takes place during the first quarter revolution of the shaft 68, operates a bell crank lever to move a clutch fork 47 and thus close a clutch 46 44 to start the rotation of a screwed shaft 45. This shaft drives by bevel gearing 56, 55 a collar 57 carrying a pin 58 which, by engagement with a pin 40 on the holder 31, Fig. 3, for the mandrel in winding position, drives the mandrel to wind the coil. During this operation, a half nut 94, Fig. 1, pivoted on a shaft 95 to which the clutch fork 47 is secured, travels along the shaft 45. After a predetermined number of revolutions of the shaft 45 and thus turns of the wound coil, the nut engages an abutment 117 to lift a frame 116, 121 about its pivots 122, 123 so that an arm 127 on the frame releases spring-held knives to sever the foil strips which by suitable guides, are spaced from the insulating strips. Just after this occurs, the nut engages an abutment 96 to move a shaft 97 axially so that an arm 98 fixed to the shaft turns a latch 100 clear of a lug on an arm 104 fixed to the shaft 95. This allows a spring 105 on the shaft 95 to move the shaft axially to disengage the clutch 44, 46 to stop the winding of the coil. At the same time, the arm 104 by moving clear of a lug 110 on a bar 106 allows this bar to rise by spring action to lift the half nut 94 from the shaft 45. A spring then returns the half-nut to its initial position in which it moves clear of the bar 160 and re-engages the screw 45. In this position the halfnut closes a switch to energize the solenoid to move its armature clear of the clutch dog 73 so that this clutch dog re-engages the teeth 70 and the cycle of operations is repeated. The strips are drawn from spools during the initial part of the winding operation by feed rollers, one of which is carried by a pivoted frame. After a few turns of the coil have been wound the half-nut 94 engages an arm 296 to turn a shaft 295 and, through linkage, to turn the feed roller carrying frame so as to separate the feed rollers to discontinue the feed thereby.