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4-5 Feed dog height
Remove the throat plate.
1. Set the feed amount to “0”.
2. Turn the hand wheel and bring the feed dog to its highest point.
3. Loosen shaft [ b ] and make a clearance between the cam and the top end of the shaft
as illustrated in the figure.
4. Put the exclusive tool (jig) to the nut and loosen shaft [ a ] on the left-hand side.
5. Turn shaft [ a ] and adjust so that the height of the feed dog is 1±0.1 mm at the
position of the needle entry hole. Then fix the shaft with the nut.
6. Turn shaft [ b ] and adjust so that a clearance of 0.1 mm is provided between the shaft
and the cam. (To such an extent that the shaft slightly comes down when it is
pressed from the upper side.)
How to adjust
Screwdriver
When shaft [b] is loosened,
shaft [a] comes in contact
with the cam and a
clearance is provided
between the cam and the
top end [c] of the shaft.
4-6 Timing belt
Remove the outer components. (Front cover, rear cover and face cover)
1. Loosen the setscrew in the idler installing
base and loosen the tension of the timing
belt.
2. Turn the hand wheel and bring the needle
bar to the lowest point of its stroke.
3. Turn the hook driving shaft and bring the
feed dog to the lowest position of its stroke.
4. Be careful that the aforementioned 2. and
3. conditions do not change, and set the
timing belt so that the screw in the main
shaft pulley (asm.) faces toward you
(screw is temporarily tightened.).
How to adjust
Screw No. 1
Jig
Shaft
Cam
Needle entry hole
[b]
[c]
[a]
1 ± 0.1 mm
0.1 mm
45°
