Patent GB-543929-A (GB)
Title: Improvements in machines for winding electric condensers
IPC: H01G13/02
Filed: 1941-04-10
Abstract: 543,929. Winding electric condensers. BRITISH THOMSON-HOUSTON CO., Ltd. April 10, 1941, No. 4772. Convention date, April 10, 1940. [Class 100 (i)] Strips of foil from rolls 20 and strips of paper from rolls 15 are fed to a divided mandrel 1 by feed rollers 18, 19 and the foil strips are fed to the rollers 18, 19 by pairs of feed rollers 22, 23. Between the rollers 22, 23 and rollers 18, 19 are fixed and rotatable foil cutting knives 58, 59 respectively and between the rollers 18, 19 and the mandrel are rotatable paper cutting knives 51. The shaft 9 of the roller 18 is driven by a motor 14 through a chain 11 and gear 10 and the shaft 28 of the roller 19 is driven from the shaft 9 by gears 26, 27. A gear 8 on the shaft 9 drives the shaft 2 of the mandrel 1 through gears 7, 6, 5 and a slipping clutch 3 and a gear 37 on the shaft 28 drives the rollers 22, 23 by a chain 36 and gears 38, 39 and 41. The rollers 19, 23 are separable from their co-operating rollers to allow for threading the strips. The cutters 51 are given a half revolution by rack and pinion and ratchet mechanism 54, 55, 55a which is given an operative movement against the action of a returning spring 57 by a solenoid 56 and the rotatable double edged cutting knives 59 are given a complex rotation by similar rack, pinion and ratchet mechanism on operation of a solenoid 60. The complete rotation of the knives 59 cuts a section out of each foil strip to form a gap and the operation of the knives 51 is timed so as to sever the paper through the gaps in the foil, The timing of the operations of the machine is controlled by a conducting drum 68 driven by gearing 70, 71, 73, 73a from the gear 8. Leads 77, 86 are connected to the mains 74 through terminals on the motor 14. A brush 75, which may when desired be moved to an inoperative position by a handlatch device 80, is connected to the lead 77 and a pair of brushes 90, 88 are connected in parallel through variable resistances 92, 85 with the lead 86. A further pair of brushes 93, 98 are connected through the solenoids 60, 56 respectively with the lead 86. When the machine is at rest the brushes 88, 90 engage insulating segments 89, 91 on the drum and the brushes 93, 98 engage insulating rings 94,99 having narrow gaps 95,100. The machine is started by closing a switch 83 which completes a circuit to the motor 14 through the resistance 85 whereby the motor is driven at slow speed. When the segments leave the brushes 88, 90, the parallel resistance 92 is placed in circuit and the speed of the motor increased. At the same time, a maintaining circuit to the motor is closed through the brushes 75, 88 so that the switch 83 may be opened. After the winding of the strips on the mandrel has proceeded for some time, the segment 91 cuts out the resistance 92 to reduce the motor speed and just afterwards, the gap 95 contacts with the brush 93 to operate the solenoid 60 to cut the gaps in the foil strips. When these gaps reach the knives 51, the gap 100 in the ring 99 contacts the brush 98 to operate the solenoid 56 to sever the paper strips. The strips continue to be fed until their ends are just below the mandrel 1 when the segment 89 contacts the brush 88 to stop the machine.