Brother International BAS-341F Instruction Manual - English - Page 40

Adjusting the needle clearance, 9-4. Adjusting the driver needle guard

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9. STANDARD ADJUSTMENTS 9-3. Adjusting the needle clearance 0.01 - 0.08 mm 0138Q 1951S 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 Needle center line Tip (1) 0135Q 1242S 1952S 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 1953S 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. BAS-341F, 342F 33

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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