Brother International BAS-343E Instruction Manual - English - Page 40

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

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9-3. Adjusting the needle clearance 0.01 - 0.08mm 9. Standard adjutsments Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw q and turn the eccentric shaft w to adjust so that the clearance between the needle and the rotary hook is 0.01 - 0.08 mm. 9-4. Adjusting the driver needle gurard Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw w and turn the eccentric shaft e to adjust so that the driver needle guard q contacts the needle. If the needle contact pressure is too great, skipped stitches may occur. On the other hand, if the driver needle guard q is not touching the needle, the tip of the inner rotary 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 q should be aligned with the center of the needle plate hole, and the needle center and the angled 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-343E 33

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9.
Standard adjutsments
33
BAS-343E
9-3. Adjusting the needle clearance
Turn the machine pulley to align the tip of the rotary hook with the needle center line.
Then loosen the set screw
q
and turn the eccentric shaft
w
to adjust so that the clearance between the needle and the rotary hook is 0.01 - 0.08
mm.
9-4. Adjusting the driver needle gurard
Turn the machine pulley to align the tip of the rotary hook with the needle center line.
Then loosen the set screw
w
and turn the eccentric shaft
e
to adjust so that the driver needle guard
q
contacts the needle.
If the needle contact
pressure is too great, skipped stitches may occur.
On the other hand, if the driver needle guard
q
is not touching the
needle, the tip of the inner rotary 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
q
should be aligned with the center of the needle plate hole, and
the needle center and the angled 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.
0.01 - 0.08mm