Disassembly Of The Needle Bar; Assembly Of The Needle Bar - Duerkopp Adler 745-34 Service Instructions Manual

2.4.3 Disassembly of a needle bar
2.4.4 Assembly of a needle bar
19
17
18
18
1
–
Remove the linkage 16 and the needle bar as described under
2.4.1.
–
Screw off screw 1 and unscrew the needle holder 2.
–
Unscrew screw 15 and loosen the spring counter bearing 16.
ATTENTION ! The spring counter bearing is under spring pressure.
Before loosening the screw 15 support the spring counter bearing
with a pin ∅ 4 mm inserted in the needle bar from below.
–
Take off the parts located in the needle bar one after the other from
below.
–
Screw the locking screw 3 tightly into the needle bar.
–
Pre-assemble the lower coupling bar 17 in the sequence as per the
illustration opposite.
3
–
Tighten nut 9 and counter-rotate the acorn nut 8 in such a way that
there is a distance of 30.5 mm between the lower edge of taper
socket 11 and the top edge of acorn nut 8.
4
Note
This dimension has to be observed in any case so that the
necessary retaining force of the coupling is achieved for the needle
5
penetration.
6
–
Put spring 5 and bush 6 on the thinner shaft extension of the
7
decoupling bar 4.
–
Push the thicker shaft extension of the decoupling bar 4 into the
needle bar 18 from below until it emerges on top of locking screw 3.
–
8 Push the following parts into the needle bar: first conical bolt 7 with
the cylindrical part showing upwards, then the pre-assembled
9
coupling bar 17 and finally spring 13 with spring 14 and spring
counter bearing 16.
10
–
Screw the spring counter bearing 16 tight by means of screw 15.
11
–
Press down the decoupling bar 4 repeatedly and check whether the
12
bars inside the needle bar are movable freely and flexibly.
13
14
15
16
2