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Adjustment Procedure Results of Improper Adjustment
(Important) No lubrication is needed for the thread take-up lever.
(Maintenance-free mechanism)
When adjusting the thread take-up lever mechanism, the following items
shall be observed:
Replacement of the thread take-up lever
1. Remove the needle bar and the needle bar connector .
2. Draw out the needle bar upper bushing .
(Cautions) Be careful not to hurt the needle bar upper bushing .
3. Loosen two needle bar crank setscrews of the main shaft
counterbalance .
4. Loosen two thread take-up lever crank shaft setscrews .
(The thread take-up lever support shaft is processed flat.)
5. Loosen the thrust collar setscrew of the thread take-up lever
crank.
6. Pull out the crank shaft set toward you, except the thrust collar.
7. Remove the thread take-up lever (coupling)
8. Replenish the appropriate grease to the needle bearing of the
thread take-up lever crank shaft.
9. Reassembly can be carried out in the reverse order for disassembly.
At that time, however, the items specified below shall be strictly
observed.
10. Insert the thread take-up lever unit to the position where it comes in
contact with the main shaft counterbalance . Install the crank shaft
set in the order of the thread take-up lever crank, the thrust collar,
and the arm.
11. Fix the needle bar crank setscrew .
(Cautions) The first screw in the revolving direction shall be made
to coincide with the flat section of the shaft.
12. Remove thrust rattles from the thread take-up lever crank shaft
and fix it being pinched by the thrust collar and the E ring.
(Make thrust adjustments so that there are no thrust rattles and the
thread take-up lever crank can slide smoothly.)
13. Drive the needle bar upper bushing to install the parts of needle
bar and needle bar connector .
14.
Turn the hand wheel by hand several turns in forward direction and fix
the thread take-up lever crank shaft by means of the thread take-up
lever crank shaft setscrew , keeping adequate needle bar centering.
(Cautions) 1. Improper centering of the needle bar causes the
thread take-up lever mechanism to be loaded
inadequately, thus greatly affecting the durability.
2. Coincidence is absolutely needed between the flat
section of the thread take-up lever crank shaft
and the screw.
3. After confirming that there is no thrust backlash,
assemble the take-up lever thrust collar.
o If this section is hurt, this will be a
cause of seizure.
o If there is thrust backlash, this will
be a cause of breakage of the
thread take-up lever.
Needle bar upper bushing Remarks
Part No. 23608003 Position: 0.5mm hollow above the
Thread take-up lever Part No. Thread take-up lever stroke
Standard specification 40037370 110mm
Specification for light-weight materials
40037439 110mm
Specification for heavy-weight materials
40055604 108mm
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