Ricoh FT8880 Service Manual page 174

6 March 1992 SECTIONAL DESCRIPTION
2.7 STAPLE UNIT POSITIONING
[C]
[D]
[H]
[G]
[E]
[F]
[A]
[B]
The staple unit [A] is hanging on the timing belt [B]. Due to the weight of this
staple unit, accurate positioning is ensured by using worm gear [C] which
transmits the staple positioning motor [D] rotation to the timing belt.
The bracket [E] guiding the staple unit has notches [F] which the staple unit
position sensor [G] senses.
Initially, the staple unit is beside the top bin. When stapling at the first bin is
completed, the staple unit positioning motor [D] energizes to move the staple
unit to the next bin where stapling is repeated.
When stapling at the last bin is completed, the motor [D] rotates to raise the
staple unit back to its home position. The staple positioning motor stops when
the staple unit home position sensor [H] is actuated.
Raising the staple unit requires more torque than lowering it. Thus the motor
speed when raising the staple unit will be approximately half of the lowering
speed.
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