Riso ComColor X1 series Technical Manual page 58

External Paper Feed Section
2. External Paper Feed Unit
This unit feeds paper in the paper feed tray to the paper transfer section, one sheet at a time.
Feeding starts when paper reaches the feeding position by means of the elevator. After each sheet is separated by
the paper feed rollers, paper is passed to the next stage in transfer, the registration rollers.
• The paper feed roller assembly, comprising the scraper rollers and pickup rollers, can rotate around the pickup
roller drive shaft, which serves as a fulcrum.
• The scraper rollers, under the influence of the paper feed pressure lever, come into contact with paper under
their own weight when the unit is set up for thin paper. When the unit is set up for card stock, the rollers come
into contact with paper both under their own weight and with force from a spring.
• When the paper feed roller assembly comes into contact with paper lifted by the elevator, it rotates and raises. It
stops at the position where the shield plate built into the the top of the assembly obstructs the sensor affixed to
the unit.
The shield plate incorporates two sensors for different detection positions.
• The pickup rollers and scraper rollers are linked by gears, and they turn in sync in the direction paper is fed.
Paper loaded on the paper feed tray is transferred toward the registration rollers by the rotation of the pickup and
scraper rollers.
• If paper other than from the highest position of the paper feed tray is fed, resistance from the stripper plate
prevents this paper from being transferred to the registration rollers.
• The pickup and scraper rollers stop after transferring a particular amount of paper.
• The pickup and scraper rollers turn while empty after paper is transferred by the registration rollers.
• The stripper section floats freely, and stripper pressure keeps it moving level to the pickup rollers.
• Although a spring keeps the stripper section in contact with the pickup rollers, if multiple sheets are fed
accidentally, it is pressed down by the sheets and can move to a position below the guide board.
• The force of the stripper section against the pickup rollers is adjusted according to the angle of the stripper
pressure adjust dial.
• The angle of the stripper section against paper loaded in the paper feed tray is adjusted according to the angle
of the stripper angle adjust dial.
• The registration sensor determines that no paper is being fed if paper cannot be detected within a specified
period.
Pickup roller
Stripper plate
Stripper spring
Paper feed pressure lever
Stripper angle adjuster
Stripper pressure adjuster
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ComColor Series (Revision 2.4)