Ricoh D124 Detailed Descriptions Manual page 83

 When the paper holding lever is down, the paper holding lever cam (1) depresses
the spring-loaded pressure arm (2) that keeps downward pressure on the
registration idle rollers (3). This closes the nip at the registration standby position.
 When the paper holding lever on the right side of the machine is raised, this
rotates the paper holding lever cam down to raise the idle rollers and open the nip.
This is done to load paper for bypass feed.
 The vertical motor (4) uses one drive belt (5) to drive the registration roller (6) and
the exit roller (7).
 The vertical encoder sensor (8) reads the codes notched on the edge of the
vertical encoder wheel (9) as it rotates on the end of the shaft of the registration
roller. These readings are used to control vertical paper feed in the main machine.
 The vertical encoder HP sensor (10) detects the small hole in the encoder wheel,
and then stops the vertical motor with the wheel at the home (start) position.
 The exit sensor (11) detects the leading edge and trailing edges of the paper as it
leaves the machine.
Detailed Descriptions 77 D124