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(7) Adjusting the needle rocking link
The needle rocking link is handled as the selective parts in order to improve the quality performance of
needle rocking. When replacing the parts, take care of the selecting procedure of the selective parts.
1. For needle rocking connecting shaft 1, there are four kinds from A through D which are different in
outer diameter tolerance respectively.
Select the shaft, the play of which is smaller in terms of the hole in needle rocking link 2.
2. For needle bar support base shaft bracket pin 3, there are three kinds from A through C which are
different in outer diameter tolerance respectively. Select the pin, the play of which is smaller in terms of
the connecting shaft collar hole.
3. Reduce the play as small as possible in the shaft direction of motor link 4 and needle rocking link 2,
and assemble them so that needle rocking link 2 rotates by light weight when holding motor link 4 by
hand.
4. There are a grease groove at the bush hole section of needle rocking link 2, a grease hole in needle
rocking connecting shaft 1, and a grease hole in needle bar support base shaft bracket pin 3. Fill
grease (exclusive grease : Part No. 23640204) when replacing them. Apply grease to the outer diameter
section as well as the inner diameter section of the rotating parts as well.
5. When installing motor link 4 to motor shaft 5, make the end plane of motor shaft 5 flush with motor
link 4 and fix the link.
Name of part Part No. Tolerance
Needle bar support base shaft bracket pin A 40008119 Large
Needle bar support base shaft bracket pin B 40008120 Medium
Needle bar support base shaft bracket pin C 40008121 Small
1
2
3
4
5
Name of part Part No. Tolerance
Needle rocking connecting shaft A 23544109 Maximum
Needle rocking connecting shaft B 23544208 Large
Needle rocking connecting shaft C 23544307 Medium
Needle rocking connecting shaft D 23544802 Small
Remarks
There are engraved
marks at the edge
sections.
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