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17
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Main feed dog
❷
Sub feed dog
❸
Throat plate
* Check that the feed dog and the slot in the throat plate
❸
are parallel
with each other, that the clearances on the right and left side of the
feed dog are equal (A).
* Maximize the feed amount (scale mark: 4). In this state, check to be
sure that the main feed dog
❶
is at the most retracted position and
main feed dog
❶
does not interfere with throat plate
❸
(B).
* Check at the most-advanced position in max. main feed and min. sub-
feed the clearance between the main feed dog
❶
and the sub-feed
dog
❷
is 1 mm (C).
How to perform adjustment:
○
Maximize the feed amount (scale mark: 4). Move main feed dog
❶
to
the most retracted position.
○
Loosen the setscrews (D) of the main feed dog
❶
.
○
Move main feed dog
❶
to adjust so that it does not interfere with
throat plate
❸
.
○
Retighten the setscrews (D).
○
Maximize the feed amount (scale mark: 4). Adjust the dierential feed
ratio to 0.7. Bring main feed dog
❶
and sub feed dog
❷
to the posi-
tion where they are closest to each other.
○
Loosen the setscrews of the sub-feed dog (E).
○
At the most-advanced position in max. main feed and min. sub-feed,
move the sub-feed dog back and forth, to perform adjustment so that
the clearance between the main feed dog
❶
and the sub-feed dog
❷
is to be 1 mm (C).
○
Retighten the setscrews (E).
If the clearances on the right side
and left side of the feed dog are
not equal, the feed dog can inter-
fere with the throat plate. In addi-
tion, irregular feed and wrinkles on
the material can be caused.
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