Riso V8000 Series, Technical Manual

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[10 - 5]
CHAPTER 10. CLAMP UNIT
3. Clamp Unit Engaged and Disengaged Position
Clamp unit disengaged position
This is where the clamp unit is disengaged from the clamp plate at which the clamp slide sensor is ON
and clamp slide HP sensor changes from OFF to ON when the clamp slide motor rotates in the reverse
direction.
Clamp unit engaged position
This is where the clamp unit is engaged with the clamp plate at which the clamp slide sensor is OFF and
clamp slide HP sensor changes from OFF to ON when the clamp slide motor rotates in the forward
direction.
4. Clamp Unit Initial Position
Clamp unit initial positioning movement
(1) First the clamp unit is moved to the disengaged position.
(2) Then the clamp engaging shaft is rotated to the home position.
Clamp engaging shaft home positioning
1) Clamp opening and closing motor rotates the clamp engaging shaft in the counterclockwise
direction (looking from the rear).
(2) Clamp opening and closing motor stops when clamp plate HP sensor detection changes from
OFF to ON.
(3) 300 msec later the clamp opening and closing motor rotates in the opposite direction until the
clamp plate HP sensor detection changes from ON to OFF.
5. Angular Sensors
The clamp plate position on the print drum is checked during the clamp opening and closing movement
by three sensors, 0 angular sensor, 180 angular sensor, and angular safety sensor.
(1) 0 angular sensor
Detects top clamp plate closed position.
Detects tail clamp plate opened position.
(2) 180 angular sensor
Detects top clamp plate opened position.
Detects tail clamp plate closed position.
(3) Angular safety sensor
Checks whether the top clamp plate is in opened position when the tail clamp plate is going to
open. The tail clamp plate will not open if the top clamp plate is detected opened.