Ricoh TMK20 Service Manual

TAPE MARKER

SPECIFICATIONS 1 November 1996

1.

SPECIFICATIONS

Tape Feed Length: 250 mm (9.8")
Tape Feed Speed: 100 mm/s (3.9"/s)
Tape Size: Outside Diameter 80 mm (3.1") or smaller

Inside Diameter 20 mm (0.8") or larger
Width 17 mm to 18 mm (0.67" to 0.71")

Dimensions: 155 mm (W) x 105 mm (D) x 60 mm (H)

(6.1" x 4.1" x 2.4")
Weight: 700 g (1.5 lb)
Power Source: +24 VDC and +5 VDC from main body
Power Consumption: 15 W

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1 November 1996 BASIC OPERATION

2.

BASIC OPERATION

2.1 OVERVIEW

[B]

[E]

[D]

[C]

[A]

[F]

After the tape dispenser receives the start signal from the main body, the
drive motor [A] rotates counterclockwise to feed out the tape. The pinch roller
[B] presses the center of the tape against the feed roller [C] flexing the tape
into a V shape. This keeps the tape stiff as it is fed out. After the tape has fed
out the proper length, the drive motor rotates in the opposite direction
(clockwise) and the cutter [D] moves down to cut the tape. After the cutter
home position sensor [E] detects the cutter actuator [F], the drive motor stops
and sends the task completion signal to the main body. The main body starts
the next job after receiving this signal.

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Tape Marker

BASIC OPERATION 1 November 1996

2.2 DRIVE AND CUTTING MECHANISM

Start Signal
Timer

Drive Motor

Home Position
Sensor

[E]

[G]

Forward

[H]

10 ms

[F]

[D]

[C]

[B]

[A]

2500 ms

Reverse

Task Completion
Signal

100 ms

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 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.

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1 November 1996 BASIC OPERATION

2.3 MANUAL CUT

[A]

Start Signal

Timer

Drive Motor

Home Position
Sensor

Start Signal

Timer

Drive Motor

Home Position
Sensor

2,500 ms

Forward

2,500 ms

Forward

Reverse

Reverse

When the manual cut switch [A] is pressed, the timer starts counting and the
drive motor starts feeding tape. 2,500 milliseconds later, the drive motor
reverses to cut the tape.

If the manual switch is pressed longer than 2,500 milliseconds, the tape
continues to be fed out until the manual switch is released. Afterward, the
motor reverses to cut the tape.

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Tape Marker