Position Of The Hook And Needle; Setting The Loop Stroke Position - DURKOPP ADLER 906 Service Manual

3.5 Position of the hook and needle

3.5.1 Setting the loop stroke position

The loop stroke is the path length from the bottom dead center of the nee-
dle bar up to the height where the hook tip picks up the loop of thread.
Figure 14: Loop stroke
(1) - Needle
(2) - Groove
The loop stroke is precisely 2 mm.
Order
First check the following settings:
• Needle bar linkage ( 3.4 Aligning the needle bar linkage, page 23)
• A straight and undamaged needle must be inserted
Correct setting
Machine is locked in place at position 1 ( page 18).
 The hook tip (3) is precisely at the center of the needle (1).
Fault caused by an incorrect setting
• Missing stitches
Cover
• Raise the upper section ( 3.1.3 Raising the machine upper
24
WARNING
Risk of injury!
Risk of crushing injuries and stab wounds from
moving and sharp parts.
Switch the sewing unit off before checking and set-
ting the loop stroke position.
①
②
③
( Operating instructions section, Inserting and replacing the needle)
section, page 14)
Individual settings
(3) - Hook tip
Service manual 906 - 00.0 - 11/2014