DURKOPP ADLER H-Type 969, Инструкция по эксплуатации

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Position of the hook and needle
Service Instructions 969 - 01.0 - 12/2015 51
10 Position of the hook and needle
10.1 Tensioning the hook drive toothed belt
A special measurement tool is required to achieve the necessary setting.
If you have to guess at the setting for the belt tension, bear the following
points in mind:
• If the tension is too high, the service life of the belt and ball bearings is
reduced.
• If the tension is too low, the belt may slip off the pulleys.
Proper setting
When the toothed belt (2) is pressed in the direction of the arrow, about
midway between the pulleys, the belt should deflect about 3 mm.
Cover
• Belt cover (

p. 13) .
• Tilt the machine head (

p. 10).
Fig. 34: Tensioning the hook drive toothed belt
Setting steps
1. Loosen the adjusting screw (3).
2. Turn the eccentric pin (1) with the tensioning pulley, and tension the
toothed belt (2).
WARNING
Risk of injury!
Crushing injuries from moving parts.
Switch the machine off before checking and setting
the hook and the needle bar.
(1) - Eccentric pin
(2) - Toothed belt (3) - Adjusting screw
①
②
③