Disassembly Of The Needle Bar; Assembly Of A Needle Bar - DURKOPP ADLER 745-34 Speedpocket Service Instructions Manual

2.4.3 Disassembly of a needle bar
2.4.4

Assembly of a needle bar

19
17
18
16
1
–
Remove the linkage 16 and the needle bar as described
under 2.4.1.
–
Screw off the screw 1 and unscrew the needle holder 2.
–
Unscrew the 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 Æ 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
retaining force of the coupling necessary for the needle penetration
5
is achieved.
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.
–
Push the following parts into the needle bar: first the conical bolt 7
8
with the cylindrical part showing upwards, then the pre-assembled
9 coupling bar 17 and finally spring 13 with spring 14 as well as
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
bars inside the needle bar are movable freely and flexibly.
12
13
14
15
16
2