Patent GB-1131253-A (GB)
Title: Continuous coil winding machine
IPC: H01F41/06
Filed: 1965-10-04
Abstract: 1,131,253. Coiling wire. G. CAMARDELLA. 4 Oct., 1965 [3 Oct., 1964], No. 42050/65. Heading B3E. A coil winding machine comprises a support for a coil to be wound, a rotatable wire guide for winding wire around the coil support, a rotatable but axially fixed hollow driving shaft, driving means for the hollow driving shaft and a driven shaft within the hollow shaft and carrying the wire guide, the interior of the hollow shaft and the exterior of the driven shaft being formed with tracks for rolling elements interposed between the two shafts to permit free relative axial movement between the two shafts while constraining the driven shaft to rotate with the hollow shaft. The apparatus comprises an annular frame 1,2 which has sockets 3 to receive the support shafts for various working stations, only the winding head being shown, supported by a hollow tube 4. A central spindle 7 in the frame supports a rotary table 8 which carries a ring 9. Pins 10 project radially through the ring and are spring-biased towards a cam 12. The table is freely rotatable on the shaft 7 and is indexed by a Geneva mechanism including an eccentric pin 13 on a wheel 14 which is mounted on a shaft parallel to the shaft 7 and is driven by a motor 19 through gears 15, 16, 17, 18. At the end of each indexing cycle a switch 22 is operated which stops the motor 19 and starts a motor 23 which drives the winding head, through belts 37 and 41. The winding head frame 30 is keyed to the shaft 4 for axial movement only and its position relative to the axis of the table 8 is adjusted by a screw 32 which is rotatable in but axially fixed relative to the tube 4. The screw passes through a nut 33 in the shape of a cross-bar which extends through slots 35 in the tube into holes in the winding head frame 30. The belt 41 drives a pulley 42 which is keyed to a hollow shaft 45, Fig. 5. Inside the hollow shaft is a solid shaft 47 and there are longitudinal grooves in the opposing surfaces of the shaft which receive balls or rollers 48 which are located by a cage 49. The shaft 47 is driven by the hollow shaft but is free to reciprocate inside it. The wire to be coiled passes over guide pulleys 51, 52, which rotate bodily to lay a coil 126 on a pin 10. The winding head 50 is reciprocated relative to the frame by a cam 70 which actuates a bell-crank lever and a slider 59 which is connected to the end of the solid spindle 47. At the end of a winding cycle, the cam 71 is returned by a spring to its starting position and during this return movement the follower roller 70 is moved away from the cam. This movement is effected by moving the slider 59 towards the turret by a lever 100 pivoted at 101 and engaged by a pin 99, projecting from a collar 106, rotatably mounted on a sleeve 104, and prevented from moving axially thereon by two circlips. At one end the sleeve 104 is tapped. and screwed on to an extension of a stem 94, which is prevented from rotating by a key 109 and is reciprocated by a cam 93, which is rotated through an angle (α), Fig. 3 (not shown), by a peg 91 on the wheel 15 engaging a catch 92 on the cam. The cam rotates freely on the spindle 7 and is spring-returned to its starting position. The other end of the sleeve 104 is axially slidable on, but not rotatable relative to an extension of the screw 32, by reason of a pin 107 which projects into a slot 108 in the sleeve. The provision of the sleeve 104 allows the initial position of the winding head frame 30, relative to the turret, to be adjusted without affecting the relative positions of the peg 99 and lever 100. When the screw 32 is rotated to move the frame 30 in either direction, the pin 107 drives the sleeve 104 which moves along the thread on the extension of the stem 94. The two threads have the same pitch, so that the pin 99 has the same movement as the frame 30. Tap-forming devices.-Intermediate taps are formed in the coil by a hook 112, Fig. 6, pivotally mounted on the winding pin carrier 113 and moved by energizing a solenoid 114 to a position in which the wire is passed round the hook to form a loop 115. In a modification, the hooks 116, Fig. 7, are reciprocable parallel to the winding pin and are projected into the path of the wire being wound by solenoids 117, against the pressure of return springs 118. Finishing devices.-Wax is applied to the coils to secure the turns by two pads 125, Fig. 8, which are normally immersed in a wax bath 121 and which are moved against the coil by rotation of the arms 124. The wire extending between successively wound coils is severed by means of a reciprocable knife 127, which is actuated by a solenoid 129 to cut the wire 131 against a resin block 130, Fig. 9. The wire loops formed by the pins 112 or 116 are cut to form terminal ends by a pair of cutters 133, Fig. 10, which are mounted on cranked arms 134. The cutters are moved together by a solenoid 136 and are opened by a spring 137. At the same time a solenoid 139 lowers a fork 138 against a spring 140, to bend the wire sections 131, resulting from the operation of the cutting device shown in Fig. 9, into the vertical plane. The machine also includes a device for tinning the terminal ends. This device is described in Specification 1,131,254.