Setting Of The Zigzag Stitch Shifting; Setting Of The Controlling Force Of The Zigzag Stitch Adjusting; Setting The Controlling Force Of The Continuous Adjusting Of The Zigzag Stitch Position; Taking Up Of The Teeth Clearance In The Zigzag Stitch Gearing - Duerkopp Adler 523 Instructions Manual

18. Setting of the zigzag stitch shifting (Fig. 18)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation,
wait until the motor stops!
With the correctly set up machine, the needle bar shifts with the maximum
zigzag stitch width at the moment, when the needle is about 4 mm above the
throat plate and its path (shifting) is symmetrical against the axis of the groove
in the throat plate. Proceed to the necessary setting after having unscrewed
four screws (6) and after having removed the guard (1). Loosen the screws
(2) of the toothed wheel (3) on the upper shaft (4). Turn the hand wheel and
change the mutual position of the upper shaft (4) and the wheel (3). After
having moderately tightened check the needle shifting. After having attained
the correct needle shifting tighten the screws (2) and proceed to the mounting
of the guard.
19. Setting of the controlling force of the zigzag stitch adjusting (Fig. 17, 19)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait
until the motor stops!
To get a continuous tilting of the slot link of the zigzag stitch (19) there is placed in the
insert (8) the braking roller (9) with the spring (10) and with the regulating screw
(11). In turning the screw to the right, the pressure upon the roller increases in
increasing so the force necessary for setting the zigzag stitch width. The proper securing
of the zigzag stitch setting is done by means of a arresting mechanism controlled by
the lever (1). Proceed to any setting of the zigzag stitch width only after having loosened
this lever in turning it to the left. The zigzag stitch width is set by shifting the lever (2).
In its zero position (up to the stop) the zigzag stitch width is zero, in shifting the lever
to the right it is increased up to 6 mm. The numerical designation on the guard (16)
corresponds approximately to the set values. The shifting force is regulated after having
withdrawn the complete zigzag stitch mechanism from the web of the arm. Unscrew
first two screws (17) on this mechanism and remove the guard (16) therefrom. Unscrew
three fastening screws (12) from the body of the zigzag stitch mechanismu. Unscrew
the lock screw (18) on the pin (20) and pull this pin out from the guide (19). Loosen
the arresting lkever (1) and disengage the pin (21). In this way the body of the zigzag
stitch mechanism is loosened to be removed from the machine arm. The remounting
thereof is done in the inverse procedure.
20. Setting the controlling force of the continuous adjusting of the zigzag stitch position (Fig. 17, 19)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
For setting continuous adjustment of the zigzag stitch position (partially that of the zigzag stitch width too) there are screwed on the guide
(19) the nut (15) and the lock nut (14). By suitable tightening of the nut (15), ensure the necessary shifting force as well as the force
maintaining the adjusted position of the zigzag stitch. Secure the position of the nut (15) in tightening the lock nut (14). Any change of the
zigzag stitch position is to be done with the loosened arresting lever (1).
21. Taking up of the teeth clearance in the zigzag stitch gearing (Fig. 17, 18)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
For taking up the teeth clearance in the zigzag stitch gearing there serves the eccentric pin (13, Fig. 17). If we want to change the
clearance, we must dismount first the upper guard (1, Fig. 18) after having unscrewed four fastening screws (6, Fig. 18). After having
loosened the screw (5, Fig. 18) which is placed on the riser in the arm space, proceed, in turning a bit the eccentric pin (13, Fig. 17), to
taking up of the teeth clearance in the zigzag stitch gearing, namely between the toothed wheel on the complete cam and the toothed
wheel (3, Fig. 18) on the upper shaft. Secure the adjusted position by tightening orderly the screw (5, Fig. 18).
1
6
7
5
4 3 2 Fig. 18
20
19
21
18
Fig.19
16
17