19
3 Adjustments
3.1 Measuring the Winding Torques
The winding torques on the ribbon rewind hub and ribbon supply hub are measured by determining the tensile force
on the test collar mounted on the hub.
The physical relation between torque and traction is as follows:
F= M / r
F: Traction [N],
M: Winding torque [Ncm],
r: Radius of test collar (30 mm)
The specied values for the winding torque and the resulting traction on the test collar are:
Winding torque M Traction F
Friction coupling on the ribbon rewind hub Fig. 13 A 14.4 - 17.4 Ncm 4.8 - 5.8 N
Brake on ribbon rewind hub Fig. 13 B 2.7 - 4.5 Ncm 0.9 - 1.5 N
Friction coupling on the ribbon supply hub Fig. 13 C 3.9 - 4.5 Ncm 1.3 - 1.5 N
Fig. 13 Measuring the winding torques
1 Ribbon rewind hub
2 Test collar
3 Spring scale
4 Ribbon supply hub
Measuring the torque of the coupling on the supply hub:
Wind the cord several times round the test collar ( g. 13 C on page 19) and mount it on the supply hub (4). The
spring lugs of the hub must slot into the smaller slot in the test collar.
Measure the winding torque for the coupling of the supply hub, and set it in the same way as on the rewind hub.
1.
2.
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