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53
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Needle bar connection guide
❷
Needle bar connection
❸
Presser bar connection
❹
Needle bar connection guide plate
❺
Needle threader shaft pin
* A clearance of 0.3 ± 0.2 mm has to be provided between needle bar
connection
❷
and needle bar connection guide
❶
.
* There has to be a clearance between presser bar connection
❸
and
needle bar connection guide
❶
. (Measure of clearance: 2 mm)
* There has to be a clearance between needle bar connection guide
plate
❹
and needle threader shaft pin
❺
.
How to perform adjustment:
Caution: Adjust the height of the needle rst. When the needle bar
connection is adjusted, the adjustment value of the needle
bar height changes due to the change in positional relation
between the needle bar connection and the needle eyelet.
As a result, the hook fails to enter the needle eyelet.
1. Remove screw (A). Remove needle thread take-up (B).
2. Loosen screw (C). Adjust the position of needle bar connection guide
❶
. The distance from the guide to needle bar connection
❷
is 0.3 ± 0.2
mm. At this time, x the needle bar connection at the position where it
does not interfere with presser bar connection
❸
.
A measure of the clearance provided between needle bar connection
guide
❶
and needle bar connection
❸
is 2 mm.
3. Tighten screw (C).
4. Adjust the lateral position of connection guide plate
❹
.
Move operation lever (D) and observe the clearance provided between
connection guide plate
❹
and needle threader shaft pin
❺
.
Loosen screw (E) and carry out adjustment by moving the connection
guide plate to the right and left.
At this time, press stopper (F) against the section shown with an arrow.
Reference: In the case the hook is to be adjusted in the next clause,
the needle bar connection guide has to be re-adjusted
after the adjustment of the hook. The needle bar connec-
tion guide, in this clause, should be adjusted so that it
does not interfere with the needle bar connection.
5. After the completion of the adjustment, install needle thread take-up (B)
with screw (A).
If the clearance exceeds the
standard adjustment value, the
needle bar connection guide can
interfere with the frame or other
parts, causing abnormal noise and
breakage.
If there is no clearance between
the needle bar connection guide
and the presser bar connection,
the needle threader cannot oper-
ate since those two parts interfere
with each other.
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