108
x Pratemaking / Master Feed / Ejection Section
chap.2
2. Rotation Control of the Roll-up Motor
If the roll-up motor is kept rotating when the master tip end is pulled to the ejection box in the plate
detachment process, the drum is actuated by the master and the stop position slips. To prevent this, the rollup
motor is stopped when the master is detected by the master ejection sensor. (If the master is not detected by
the master ejection sensor, the Roll-up motor is stopped by the timer.)
(1) Master Ejection Sensor
Operation
Photo-emission from the master ejection sensor is
received on the master ejection sensor, and the
sensor detects with the photo strength whether the
master is pulled to the master ejection box. Photo-
receiving amount is checked with the HELP5.
1. Plate Ejection Error Detection
While one platemaking is being processed, the difference of photo-receiving amount is less than 8 by checking
with the HELP5, which is determined as an plate ejection error. The following display and operation are
shown.
2"PLATE EJECTION ERROR" is displayed on the error display panel and printing is not processed.
2"PLATE EJECTION ERROR" is cleared with the all clear key, stop key or by performing
platemaking / printing.
2A plate ejection error is not detected for one platemaking soon after a plate ejection error or master setting
error is detected.
: ¡If incorrect sensing occurs due to sensor malfunction, etc., HELP32can be used to prohibit
plate ejection error sensing.
Timing
If the variation in the amount of light received by the master ejection sensor during the making of 1 plate is
less than a certain level (8 in the HELP5 display value), a plate ejection error is deemed to have occurred.
IMPORTANT
Smaller
HELP 5 value
HELP 5 value
Larger
Photo-receiving amount
3. Function of Parts
HELP mode H-32 \ see p.337
HELP mode H-05 \ see p.303
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