Patent GB-825804-A (GB)
Title: Improvements in or relating to coil winding machines
IPC: H01F41/08
Filed: 1957-11-04
Abstract: 825,804. Winding toroidal coils. SPERRY RAND CORPORATION. Nov. 4, 1957 [Nov. 7, 1956], No. 34337/57. Class 83 (4). A machine for winding coils on annular cores includes a hollow wire-supply bobbin, peripherally slotted and in the form of a split ring, and a flexible drive member contacting the bobbin throughout substantially its entire periphery. A bobbin 30 made of hypodermic needle stock has a peripheral slot 31 and is split by a sloping cut 32, Fig. 25. The bobbin is joined at the split by a slotted plug 33, one end of which is flattened at 35, Fig. 27, to clamp the end of a fine wire 36 which is loaded on the bobbin. The bobbin 30 is supported in a slot 75, Fig. 14A, in a frame comprising a fixed curved member 71 and a co-operating curved member 70 pivotable away from the member 71 for the insertion of the bobbin. A flexible belt 37, driven by a pulley 58, runs over guide pulleys 38, Fig. 15, disposed around the bobbin, in the frame members 70, 71 and lies in a chamber 75a in the said members 70, 71, so as to contact and rotate the bobbin and keep the wire load therein. A motor 44 drives a shaft 52 in turn rotating, through bevel gears 54, 55, the pulley 58. A circular metal table 80 in the space between the members 70, 71 has a top surface plated with wear-resistant material 81 and is level with the plane of movement of the wire 36 as it leaves the bobbin 30, a radial slot 82 in the table 80 receiving a reciprocating rubber-faced jaw 143 which co-operates with an oppositely reciprocating jaw 142 to turn an annular core 144 as it is wound. A circular guide plate 83 slotted at 85 to take the jaw 142 is disposed over the table 80 and is pivotable away therefrom for the insertion of the bobbin. A spring on the underface of the plate 83 contacts the table 80 and is connected to a counter circuit through a wire 91 so that for every turn wound on the core 144 the wire 36, which is insulated, breaks the circuit. When a predetermined number of turns have been wound, a brake 159, Fig. 2, is released by lifting a latch 167 by a solenoid 170, to press against a brake drum 53 on the shaft 52, and the motor 44 is stopped. A spring contact 98 ensures that the circuit is not broken - when the plate 83 is pivoted away. A brush 94, Fig. 1, depending from the plate 83 also aids in keeping tension in the wire 36. An arm 102, Fig. 13, may be swung down by a handle 104 to hold the bobbin when the frame is opened, a lever 107, Fig. 2, connected to the handle 104 opening a microswitch 110 to stop the drive motor 44. The core turning jaws 142, 143 are reciprocated by a pinion 132, Fig. 4, engaging parts of the jaws formed as racks. The pinion 132 is mounted on shaft 131 driven through gearing and spring- loaded clutch means 133, Fig. 1, from a shaft 119 driven through gearing and a clutch 134 by a shaft 114 driven, through manually operated reversing means 111, by a shaft 61. A friction wheel 60 on the shaft 61 is driven by engagement with a drive disc 59 on the shaft 52. The position of the wheel 60 may be adjusted across the face of the disc 59 to alter the speed and direction of rotation of the shaft 61. The upper jaw 142 may be pivoted up, against the pressure of a spring-loaded roller 155, and the lower jaw 143 is supported by a fixed roller 147 and a vertically adjustable roller 148. In a modification, Figs. 17, 18, 20, to wind a core 144 with a series of spaced windings 196, Fig. 22, the core 144 is held by a jig 197 having two fixed jaws 198 and an adjustable jaw 199. The jig is oscillated about the axis of the coil by a shaft 202, to a pulley 206 on which is fixed a band 208 also secured to pulley 209 on the shaft 131. The reversing mechanism 111, through which the shaft 131 is driven, is automatically operated by solenoids actuated by switches 217 closed alternately by arms 210 on the shaft 202, so that the core 144 is oscillated between limits until the desired number of layers of wire have been wound on the core to form one of the windings 196.