Patent GB-552396-A (GB)
Title: Improvements in or relating to coil winding machines
IPC: H01F41/06
Filed: 1941-10-01
Abstract: 552,396. Winding coils or bobbins. JOHNSON LABORATORIES, Inc. Oct. 1, 1941, No. 12702 Convention date, Oct. 4, 1940. [Class 120 (ii)] A machine for winding electrical coils has automatically operating means for controlling the speed of the winding spindle which is driven for a short period at a relatively slow speed at the beginning and end of the winding and at the normal winding speed between such periods; the automatic control means also stops the winding operation when the coil is completed. The control means may be adjustable to vary the duration of the periods of slow speed and for varying the number of turns wound in the completed coil. As shown the winding spindle 11, Figs. 2 and 5, is driven from an electric motor 55 by a belt 54 and the control means includes switch mechanism and one or more resistances in the motor circuit. The spindle 11 is connected through change gearing with shafts 35 and 44, the shaft 35 driving the control shaft 28 through worm gearing 69 37, 38 and friction discs 39, 40 and the shaft 44 carrying a cam 22 slidably keyed thereto and engaging a pin on a collar 24 adjustably fixed on the traverse bar 18; the bar 18 is slidably mounted in blocks 16, 17 fixed to a carriage 14, the block 16 rotatably supporting the cam 22 and the carriage carrying a pin 32 engaged by a cam 29 on the shaft 28, which rotates less than a revolution during the winding of a coil. By varying the cams, coils of varying forms may be wound; the cam 22 only may be used in which case the cam 29 is replaced by a circular disc or the carriage 14 is clamped in position with the pin 32 engaging the radial surface of the cam 29 or the cam 29 may be used alone or in conjuction with the cam 22. The friction disc 39 is secured to the shaft 28 and the disc 40 is pressed against the worm wheel 38 by springs 41 so that the shaft may be turned by a crank handle 31 and the carriage 14 returned to its initial position after a coil has been wound without actuating any of the other shafts. The shaft 28 carries three control discs 71, 72, 73 each having a notch in its periphery which is engaged by a spring 81, 85 and 89 respectively and each adjustable on a sleeve 76 to vary the relation of the spring to its disc and notch, the sleeve, after adjustment, being secured to the shaft which is then driven through the friction disc 39 and by reason of pins in the disc 40, the disc 71 which by as holes engaging the pios. Adjustment of the disc 71 determines the initial interval of winding at slow speed while adiustment of the discs 72, 73 determine, respectively, the final interval of winding at slow speed and the total number of turns to be wound on the spindle 12 fed to the winding spindle. The springs 81, 85, 89 respectively operate spring contacts in the motor circuit containing a pair of rheostats 106, 107, Fig. 10, an electromagnet 65, connected with a rod 68, controlling a brake 58 for the pulley 53 on the spindle 11, an electromagnet 100 connected with a rod 9 for starting the motor, and push buttons 108, 109 for respectively momentarily starting the motor and for stopping it. should such be necessary before the completion of a coil. When the motor is to be started the rod 68 is first depressed to release the brake 58 from the pulley 53, a pivoted latch 62 connected to the core of the electromagnet 65 engaging the brake lever 59 to keep the brake disengaged; pressure on the button 108 will then cause the circuit through both rheostats and the motor to be closed and the spindle 11 to be driven and when the winding of a coil is to be started the button 108 is released and the rod 94 is operated, this action moving a pivoted lever 95 so that an insulated block carried thereby closes contacts 102, 103 in the motor circuit and holds them closed by a pivoted latch 98 engaging a notch 97 in the lever 95. The closing of the circuit through both rheostats causes the spindle 11 to be driven at a slow speed until the notch in the disc 71 moves out of engagement with the spring 81 which is then depressed by engagement with the periphery of the disc and closes contacts which causes the rheostat 107 to become short circuited and the motor to be driven at its full speed; contacts in connection with the spring 85, are, during this period, also closed by reason of the spring engaging the periphery of the disc 72, but when the winding of the coil is'nearly completed, the'spring 85 engages the notch in the disc 72 and opens the contacts to include the rheostat 107 again in the motor circuit so that the motor is driven at the slow speed until the notch in the disc 73 engages the spring 89 when other contacts are closed to complete the circuit through the electromagnet 65 which is energised to actuate the latch 62 and release the brake lever 59, the brake being then applied to the spindle 11 by a spring 67; at the same time the electromagnet 100 actuates the latch 98 to release the lever 95 which causes separation of the contacts 102, 103, and interruption of the circuit through the motor and electromagnet, the result being also obtained at any time by depressing the push button 109, the terminals of which are connected to the contacts of the spring 89. In a modification the circuit includes three rheostats so that the initial and final slow speeds may be different.