26
11) Timing adjustment of needle and hook
Set the stitch length to a minimum and place the needle 2 mm off of the lowest position. A carved sign “H”will appear on the belt cover
window② and hook tip③ will come to the center of the needle. The appropriate clearance between the needle groove and the shaft tip③
is 0.02~0.1 mm. At this time, the needle guard④ of the hook must not come in contact with the needle.
[ Fig. 41 ]
②
①
③
④
0.02~0.1mm
2mm
H
10) Height adjustment of feed dog
Set the stitch length to a minimum and put the feed dog in the highest position. The needle bar will come down to the lowest position and
the feed dog must be raised 0.5 mm off of the needle plate. If the position is not suitable, make the height adjustment as indicated below.
A. Disassemble the bed cover
B. Unfasten the fixing screw of the lower feed cam①, adjust the position and fasten back the screw tightly.
※ Normally, a carved sign② of the lower feed cam heads up perpendicularly with the needle bar in its lowest position.
[ Fig. 39 ] [ Fig. 40 ]
②
①
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