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Fig. 3. Schematic diagram of Torque Controller.
obtain the decreased torque required when the motor is used for holdback. Operation of the device in the above manner serves to maintain a lower value of film tension for holdback operation than for take-up with no change required in the settings of the resistor contact bands for change-over from take-up to holdback duty.
Maintenance of holdback tension in proper relation to the take-up tension results in the elimination of: (1) reversal of the net film tension and its resultant shifting of the film on the sprocket plus gear train chatter, (2) high film tension at the end of the reel which otherwise would tend to produce sprockethole flutter.
An automatic follower arm lift has been provided to facilitate placement of
a reel or spool of film on the reel spindle or removal therefrom. Lifting of the arm to its extreme rotational position from the spindle is accomplished by means of the solenoid, shown in Fig. 3, which is energized when the main motor power switch is in its OFF position.
The automatic torque controller as illustrated is suitable for use on magnetic recorder-reproducers or photographic reproducers having film handling capacity on either reels or spools up to 2000 ft. Its use is particularly advantageous in eliminating the extremely high film tension which results when 2000-ft rolls wound on standard film cores are used. Obviously the same principle may be applied for reels of larger diameter.
Carl £. Hittle: Automatic Torque Controller
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