Ricoh C211 Service Manual page 201

2.2 DRIVE AND CUTTING MECHANISM
Start Signal
Timer
Drive Motor
Home Position
Sensor
Task Completion
Signal
[D]
\
10ms
[A]
+
1
l--~ I
r<
.
Forward ~'
54
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 O, the start signal from the
main body changes from high (+5 VDC) to low (O VDC) to start the timer on the
tape dispenser PCB. 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 PCB sends the task
completion signal to the main body.
6-3