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Fig. 6. Film-drive mechanism.
As an operating convenience, the follower arm is automatically retracted from the film reel by means of a solenoid energized through the master control switch when positioned at OFF. Upon setting the master switch for the desired operation of the film drive, the follower arm is released and allowed to seek the periphery of the film roll. Thus, a predetermined potential to the torque motor is automatically established.
B. Control Panel Assembly. As shown in Fig. 1, controls for the film-drive mechanism, as well as for rewinding, are mounted on a separate panel. An exception to this arrangement was shown in Fig. 3 where these controls were placed on the film-feed assembly in order to conserve rack space for a particular installation. In general, the separate panel allows the use of larger film reels and gives several operating as well as manufacturing conveniences. In the latter respect, the associated film-drive mechanism may use any of the industry standard motors including the combination synchronous/interlock type. The
use of a separate control panel therefore permits a variety of electrical combinations to suit the associated motor systems without alteration of the other electrical circuits. Figure 1 shows the master switch designated for operation of a combination synchronous/interlock film-drive mechanism motor. This switch is divided into eight positions in order to give independent switching for the respective sections of the motor. It is also seen that on either side of the OFF position for synchronous motor control, there appears a READY position which permits energizing the feed and take-up motors before completing the circuit to the film-drive mechanism motor. Thus, the torque motors, being pre-energized ahead of the actual rolling of the overall mechanism, remove all slack in the film path and permit the feed and take-up reels to follow the acceleration or deceleration of the film-drive mechanism motor. READY positions for interlock operation are not required since the torque motors are energized on the LOCKING cycle of the interlock motor system.
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October 1952 Journal of the SMPTE Vol. 59