19
3
Adjustments
3.1
Measuring the Winding Force
The measurement of the un- and re-winding torque of the ribbon is determined by the tensile force on the test
material that is connected to the ribbon retainer.
The physical connection between the torque and tensile force is as follows.
F= M / r
F:
force [N],
M:
torque [Ncm],
r:
Radius of the test material (30 mm)
3.1.1
Testing the Winding Force of the Clutch and Break of the Ribbon
1
2
A
B
C
3
1
2
3
1
2
3
Fig. 13
Testing the winding torque of the clutch and break.
Target Value
Measurement
Torque M
Force F
Clutch of the rewinder ribbon
A
14,4 - 17,4 Ncm
4,8 - 5,8 N
Break of the rewinder ribbon
B
2,7 - 4,5 Ncm
0,9 - 1,5 N
1. Place the test device (3) on the ribbon retainer (2). Note that the Spring tip must be placed in the grove of the
ribbon retainer for a true result.
2. Close the printhead assembly group and employ the spring scale connecting it to the rewinder with the test device
(3) inserted.
3. To measure the clutch force wind the string around the test device (3) numerous times as illustrated in
A.
4. Connect the spring scale [10 N] (1) to the end of the string and move it upwards vertically until the test device
starts to turn.
5. Unravel the string at least one full revolution of the test device and measure the force F of the clutch from the
spring scale.
6. If the torque deviates from the target values set it anew. (
3.2 on page 21).
7. To measure the breaking force wind the string around the test device (3) numerous times as illustrated in
B
and
repeat the process.
8. If the force of the breaking force deviates from the target values the break need to be replaced as there are no
settings possible. (
2.7 on page 13).
