9-3. Adjusting the needle clearance; 9-4. Adjusting the driver needle guard; 9-5. Adjusting the shuttle race thread guide- Page 40

9. STANDARD ADJUSTMENTS

BAS-341F, 342F

33

Needle center line

0.01 - 0.08 mm

(1)

Tip

9-3. Adjusting the needle clearance

Turn the machine pulley to align the tip of the shuttle hook with the needle center line.    Then loosen the set screw (1)
and turn the eccentric shaft (2) to adjust so that the clearance between the needle and the shuttle hook is 0.01 - 0.08 mm.

9-4. Adjusting the driver needle guard

Turn the machine pulley to align the tip of the shuttle hook with the needle center line.    Then loosen the set screw (2)
and turn the eccentric shaft (3) to adjust so that the driver needle guard (1) contacts the needle.    If the needle contact
pressure is too great, skipped stitches may occur. On the other hand, if the driver needle guard (1) is not touching the
needle, the tip of the inner shuttle hook will obstruct the needle, resulting in an excessively high amount of friction.

9-5.  Adjusting the shuttle race thread guide

The needle groove of the shuttle race thread guide (1) should be aligned with the center of the needle plate hole, and the
needle center and section 

A

 should be aligned.

Note

If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may occur.

0138Q

1951S

1242S

0135Q

1952S

1953S