Patent GB-190507819-A (GB)
Title: Improvements in Coil Winding Machines for Electrical and other Apparatus.
Filed: 1905-04-12
Granted: 1906-03-08
Abstract: 7819. British Thomson-Houston Co., [General Electric Co.]. April 12. Bending; wire. - A coil - winding machine, particularly designed for winding coils of wire for electrical apparatus, but applicable generally to wind articles varying widely in construction and having any predetermined number of turns, is shown in front, part side, and part back elevations in Figs. 1, 2, and 4 respectively, and in plan view in Fig. 5. The winding operation is automatically stopped, after the desired number of turns have been wound, by the employment of electro-mignetic tripping - mechanism, the tension of the wire is equalized by the use of spring-supported guidepulleys and an adjustable braking-device on the bobbin spindle, and automatic means are provided for increasing and decreasing the width of the various layers of wire and for winding a second coil in continuation of, but laterally displaced from, the first coil, as is required in the case of the armatures of certain motor meters. The wire from the reel, which is secured on a spindle 23, Figs. 2 and 5, by means of a thumb-nut 25, passes over spring-supported guide-pulleys 26, 27, 28, 28<1> and then up to the former or armature frame 10. The main shaft 2, Figs. 1 and 4, which may be directly rotated by an electromotor, drives, by means of friction gearing 3, 4, a shaft 5 which may be moved into gear through friction rollers 6, 11, Fig. 5, with a shaft 8 carrying the former 10 and a fly-wheel 9, or through friction gearing 21, 22 with the spindle 23. The shaft 5 is supported at one end by a flat spring 12, Fig. 2, fixed in a block 13 and adapted to be rocked by means of a forked arm 14 on a shaft 15 to which is secured an arm 16 provided with jaws 17. A shaft 18 furnished with a handle 19 carries a pin 20 eccentrically disposed between the jaws 17, so that, by rocking the handle 19, a quarter of a revolution in one direction, the shafts 5, 8 are brought into gear to wind wire upon the former, the handle 19 being locked in this position. By turning the handle an equal amount in the opposite direction, the shafts 5, 23 are connected to wind wire off the former. A crank 75, Fig. 1, on the shaft 18 is connected by a link 76 to a spring 77 which is retained in its raised position by the spring-retracted armature 79 of an electro-magnet 78. When the electro-magnet 78 is energized, the spring 77 and handle 19 are released, and the shaft 5 is disconnected from both the shafts 8, 23. In order to equalize the tension on the wire, the pressure of a braking-device upon the spindle 23 or upon the reel is varied as the tension varies. The brake consists of a pivoted lever 30, Fig. 1<A>, acted upon by a spring 33 and carrying metal pieces 31 which rest in a peripheral groove in the pulley 22. The pulley 26 is carried by a leaf spring 36 secured to a rod 37 pivoted on a standard 35 and connected by an adjustable link 39 to the brake-lever 30. The guide-rollers 28, 28<1> are carried on the ends of a leaf spring 29, Fig. 2, secured to a shaft 40 mounted in jaws 41, Fig. 1, on a rod 42, which is movable longitudinally and is prevented from turning by means of a screw and slot 63. Rigidly secured to the shaft 40, Fig. 2, is an arm 43 to which is pivoted a rod 44 reciprocated through a sliding sleeve 54, Figs. 4 and 9, bent lever 53 pivoted at 52, and spring-pressed bearing-lever 49, by a cam 48 driven by worm gearing 45, 46 from the shaft 8. The rollers 28, 28<1> are thus moved from side to side to guide the wire as it is wound upon the former, and, in order to increase or decrease the width of the several layers of wire automatically, the reciprocatory movement of the rod 44 is varied by shifting the position of the sleeve 54 upon the bent lever 53. A spring-pressed lever 59 bearing upon a second cam 55 is connected to the rod 44 by a link 62, so that, as the cam is rotated, the rod 44 is moved up and down on the lever 53, thereby changing its throw. The cam 55 is keyed on a shaft 56 extending through a sleeve 86 which is driven by gearing 57, 58 from the shaft of the cam 48, and the shaft 56 may be caused to rotate with the sleeve by means of a disk 87 splined thereon and pressed by a spring washer 90 and nut against a sleeve. For the purpose of arresting the motion of the shaft 56 and of rendering the variable-throw mechanism inoperative, an arm 91, Fig. 1, fixed to the faceplate, serves to engage with a pin 88 inserted in one of a number of holes in the disk 87. In some cases, in winding armatures for motor meters, it is necessary to first wind one coil and then a second coil in continuation of, but laterally displaced from, the first. This is effected by automatically sliding the rod 42 when the first coil has been wound. The rod is urged by a coiled spring 64 to force the guide-rollers 28, 28<1> away from the former 10, and carries a thumb-nut 65, Fig. 1, between which and a boss 70 on the framing fits the rectangular portion of a horizontal rock-shaft 69, Figs. 1 and 11. A projection 72 on the shaft 69 is acted on by a vertical spring-pressed plunger tending to rotate the shaft and to withdraw it from between the nut 65 and boss 70. A cam 73, Fig. 4, on the shaft 69 is provided with a spring-pressed pivoted latch 74, which carries the armature 80 of an electro-magnet 81 so that, when the circuit of the electro-magnet is closed, the shaft 69 is released and the rod 42 shifted. An extension 74<1> of the latch is adapt d to engage with one or other of the contacts 82, 85 according as the electro-magnet 81 is energized or not. For the purpose of stopping the winding operation after a predetermined number of turns have been wound, the switch apparatus shown in Figs: 1 and 9 is employed. Two conducting rings 92, 93, concentric with the shafts 47, 56 respectively and embedded in insulating material 92<1>, 93<1>, are each provided on the surface of the face-plate with a number, preferably 10, of equally-spaced contactholes in which are inserted pins 94 adapted to contact with arms 95, 96 on the shaft 47 and sleeve 86 respectively. The shaft 47 and sleeve 86 should for convenience have a speed ratio of 10 to 1, so that the arm 95 will make a complete revolution while the arm 96 only makes one-tenth of a revolution. In operating the machine, a pin is inserted in a hole in the lower ring corresponding to the number of tens of turns, and a pin in a hole in the upper ring corresponding to the number of single turns, and the machine is started by rocking the handle 19. When the desired number of turns has been wound, the arms 95, 96 will be in contact with the corresponding pins, and a circuit will be closed from a suitable source by way of the contacts 74<1>, 85, Fig. 4, the release magnet 78, ring 92, through the framing to the ring 93, and back to the source, the magnet 78 thereupon disconnecting the shafts 5, 8. When it is desired to wind two parallel coils as described above, a pin is inserted in one of the holes in the ring 93 corresponding to the number.of turns to be wound in the first coil, and pins are also inserted in both rings in positions corresponding to the total number of turns to be wound in the two coils. The machine is then started as before, and, when the lower brush engages the lower pin, a circuit is completed through the contacts 74<1>, 82, the framing of the machine, and the electro-magnet 81, which thereupon trips the catch 74 and allows the guide-rollers 28, 28' to be moved into a position for winding the second coil. When the second set of contacts have been made by the arms 95, 96 the release magnet 78 is energized as before.