Adjustments; Measuring The Winding Torques - CAB MACH4 Service Manual



Adjustments

.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 specified values for the winding torque and the resulting traction on the test collar are:
Friction coupling on the ribbon rewind hub
Brake on ribbon rewind hub
Friction coupling on the ribbon supply hub
A
1 2
Fig. 13 Measuring the winding torques
1 Ribbon rewind hub
2 Test collar
Measuring the torque of the coupling on the supply hub:
Wind the cord several times round the test collar ( fig. 13 C on page 19) and mount it on the supply hub (4). The
1.
spring lugs of the hub must slot into the smaller slot in the test collar.
2. Measure the winding torque for the coupling of the supply hub, and set it in the same way as on the rewind hub.
B
3
Winding torque M
Fig. 13 A 14.4 - 17.4 Ncm
Fig. 13 B 2.7 - 4.5 Ncm
Fig. 13 C 3.9 - 4.5 Ncm
C
4
3 Spring scale
4 Ribbon supply hub
Traction F
4.8 - 5.8 N
0.9 - 1.5 N
1.3 - 1.5 N
2 3
19