Drive And Cutting Mechanism - Ricoh C231 Service Manual

2.2 DRIVE AND CUTTING MECHANISM

Start Signal
Timer
Drive Motor
Home Position
Sensor
Task Completion
Signal
The tape dispenser uses a stepping motor, which is driven at 460 pulses per
second, as a drive motor.
When the print counter of the main body becomes 0, the start signal from the main
body changes from high (+5 VDC) to low (0 VDC) to start the timer on the tape
dispenser board. When the start signal changes to high 10 milliseconds later, the
drive motor [A] starts to rotate counterclockwise to feed tape. However, since a
one-way bearing is mounted in the cam drive gear [B], the cutter cam [C] does not
rotate.
The drive motor starts rotating in the opposite direction 2,500 milliseconds after the
timer starts. At this time, the tape has been fed out 250 mm (9.8") from the tape
dispenser. The drive motor rotates the cam drive gear clockwise and the eccentric
shaped cutter cam presses down the cutter arm [D]. The cutter [E] then goes down
to cut the tape. The cutter spring [F] returns the cutter to its original position. After
the cutter home position sensor [G] detects the cutter actuator [H], the drive motor
stops and the tape dispenser board sends the task completion signal to the main
body.
C532
[F]
[E]
[G]
[H]
[D]
10 ms
2500 ms
Forward
7-3
DRIVE AND CUTTING MECHANISM
[C]
[B]
[A]
C532D502.PCX
Reverse
100 ms
C532D503.WMF
SM