Position Of The Hook And Needle; Setting The Loop Stroke Position - DURKOPP ADLER 911-211 Service Instructions Manual

Machine head

4.4 Position of the hook and needle

4.4.1 Setting the loop stroke position

The loop stroke is the path length from the bottom dead center of the
needle bar up to the height where the hook tip picks up the loop of thread.
Fig. 18: Loop stroke
The loop stroke is precisely 2.4 mm.
Sequence
First check the following settings:
• Needle bar linkage ( 4.3 Aligning the needle bar linkage, p. 20)
• A straight and undamaged needle must be inserted
Proper setting
Machine is locked in place at position 1 ( p. 16).
 The hook tip (3) is precisely at the center (1) of the needle.
Fault caused by an incorrect setting
• Missing stitches
Cover
• Swiveling up the machine head ( 3.3.1 Access to the machine bottom
Service Instructions 911-211 - 00.0 - 02/2015
WARNING
Risk of injury!
Risk of crushing injuries and stab wounds from
sharp and moving parts.
Switch off the machine before checking and setting
the loop stroke position.
①
②
(1) - Needle
(2) - Groove
( Operating Instructions chapter, Inserting and replacing the needle)
section, p. 10)
③
(3) - Hook tip
21