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5 Adjustments
5.1 Measuring and Adjusting the Winding Torques
The rewinder for the transfer ribbon is coupled with a slipping clutch to the main drive. The unwinder of the transfer
ribbon is braked with slipping clutches during printing.
The correct setting of the torques of these slipping clutches is necessary for:
• Precise conveyance of the transfer ribbon during label transport
• The prevention of wrinkles in the feed path of the transfer ribbon
The winding axle of the rewinder is not actively driven by the belt during label backfeed, but rather solely by the pull
of the print roller. The torque required to disengage the rewinder from the belt drive is implemented via a brake in
the winding reel, which works in both directions. The measured torque against the winding direction is the sum of
the coupling torque and the torque of the brake. Only the torque of the brake is measured when the winding axis is
rotating in the winding direction. For this reason, measurements of the torques at the rewinder are required in both
directions.
If the winding torques differ from the set values, the clutches must be adjusted.
5.1.1 Measuring the Winding Torques
The measurement of the winding torque at the ribbon winder occurs by determining the pulling forces on a test collar
attached to the winder.
The physical relation between the torque and the pulling force is:
F= M / r
F: Pulling force [N],
M: Winding torque [Ncm],
r: Radius of the test collar (3 cm)
Removing the Front Cover
Note!
The pulling forces are measured with a spring scale. For a correct measurement the spring scale must be
vertically moved up. Therefore the front cover must be removed intermediately.
1 12
Figure 12 Removing the front cover
Loosen 4 screws (1) and remove the front cover (2).
Re-mount the cover after measuring and adjusting the clutches.
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