Adjustment Of The Hook Timing; Setting Of The Middle Part Of The Hook Holder - Duerkopp Adler 523 Instructions Manual

11. Adjustment of the hook timing (Fig. 9, 10)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
Set a zero zigzag sitch on the machine. Turn the hand wheel towards ourselves, until the needle bar descends in its lowest point and then
ascends by 2.1 + 0.3 mm upwards. In this position, the hook point must be on the needle axis. The max. space between the needle and
the hook is to be 0.05 mm. If it is not so, dismount the throat plate proceed to the correct setting of the hook timing using the locating
fixture. When the needle bar is in its lowest position, screw on the locating fixture (Fig. 9) onto the needle bar together with gauges giving
the hook timing size, namely 2.1 + 0.3 mm (gauge 1.8 + gauge 0.3).
Tilt the gauges in thickness of 1.8 and 0.3, lift the needle bar by the hook timing value upwards (Fig. 10). In this position, the hook point
must be on the needle axis. Secure the correct hook position in tightening the screws and proceed to the mounting of the throat plate.
12. Setting of the middle part of the hook holder (Fig. 11, 12)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
Set the middle part hook holder (7) in such a way, so that the space between the holder nose and the bottom of the groove of the middle
hook part is about 0.7 mm. Proceed to this setting after having loosened the holding screw (10) using a locating jig (Fig. 11) - see
equipments part A, par. 4.2, 4.4.
Fig. 9
10 7
4
Fig. 10
Fig. 11