Ricoh PB1120 Field Service Manual - Page 7

Browse online or download pdf Field Service Manual for Printer Accessories Ricoh PB1120. Ricoh PB1120 23 pages. Paper feed unit

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1.Detailed Descriptions

Paper Feed Operation

Paper Feeding

The paper feed tray of the main machine employs the RF (Roller Friction) method for paper separation.

The RF mechanism comprises a separation roller with a torque limiter attached that forces paper

separation (no reverse drive is used).

A paper feed signal switches on the paper feed clutch (CL1) [A] and starts rotating the paper feed roller

[B] which feeds the paper. At the same time, switches on the paper transport clutch (CL2) [C] and starts

rotating the paper transport roller [D] which feeds the paper.

When the leading edge of the moving paper switches on the registration sensor, this switches the paper

feed clutch (CL1) and paper transport clutch (CL2) off. Image position timing starts while the registration

sensor is on, and then the paper is transported to the transfer unit.

The paper feed clutch (CL1) and paper transport clutch (CL2) are driven by the bank drive motor (M1)

[E].

In front of the feed roller [A] a pre-separation plate [B] is installed to block the top of the stack from

entering past the feed roller. The friction roller [C] separates the first sheet from the top of the stack so

only the top sheet feeds.