FP 25 E
Issue: 06/2011
31
3 .6
Drive Components in the Projector Head
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NOTE
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In this chapter you will get an overview of the drive components.
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All work on drives should only be carried out by experts.
Main drive motor
Main drive encoder
Lower/holdback
sprocket
shaft & cog
Toothed belt
Upper/feed sprocket
shaft & cog
Sound drum shaft
reverse-scan
sound device
Intermittent sprocket
motor
Sound drum shaft
Lens turret motor
(option)
Aperture changer
drive (option)
3 .6 .1 Main Drive
Via toothed belt and gears the following shafts are driven by the main drive motor
:
- feed sprocket
- bottom sprocket
- main drive encoder
The main drive encoder is directly positioned behind the main drive motor on their
common shaft.
3 .6 .2 PREMIERE Intermittent Sprocket Drive
Via pulses the main drive encoder counts the quantity of the film (transport unit = 1
picture), which is transported out of the feed sprocket into the film gate.
If one “transport unit” is completely counted and the shutter position is dark the motor
of the intermittent sprocket carries on the film for one picture.
This operation is controlled by a microprocessor which is mounted on main board.
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Components - Projector Head
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