JUKI MEB-3200 Engineer's Manual page 19

Adjustment Procedures
1. Position where the presser plate is open (Position at the time
of sewing)
1) Loosen setscrew 5 and remove auxiliary cover 4.
2) Turn ON the power and press the ready key to light up the
sewing LED.
3) Press the knife ON/OFF key to make the LED go out and the
cloth cutting knife inoperative.
4) Press the presser switch (presser comes down), press the
forward key and cloth open cylinder 7 is turned ON (Arrow
mark D). Then the presser plate will open.
(Cloth open driving link 6 comes in contact with adjusting screw
3.)
5) Loosen nut 2, and turn adjusting screw 3 to adjust so that
position A where the presser plate is open to 1 mm. Turning
adjusting screw 3 clockwise makes clearance A smaller or
turning it counterclockwise makes clearance A larger.
6) After adjusting clearance A, fix nut 2.
* 1. Position A where the presser plate is open which has been
adjusted in step 5) becomes the position of presser foot
! 1 in terms of throat plate ! 0 . Consequently, in the case
where you desire to retain the place near the outside needle
of the sewing pattern with the presser foot, make clearance
A larger to make smaller clearance C between throat plate
!0 and presser foot !1 . In this case, clearance C between
throat plate ! 0 and presser foot ! 1 is required to be large
due to the closing amount (= cloth opening amount)
described in "2. Position where the presser plate is closed"
below.
* 2. The range of mechanical adjustment of clearance A is
approximately 0 to 3 mm in the state of standard delivery.
However, it is necessary to consider the aforementioned *
1.
2. Position where the presser plate is closed (Initial position)
1) After performing adjustment of the aforementioned "1. Position
where the presser plate is open" (or after confirming clearance
A), press the reset key. Cloth open cylinder 7 is turned OFF
(arrow mark E) after the presser has been raised, and the
presser plate will be closed. (Cloth open driving link 6 comes
in contact with the slot F of stopper !2 . )
2) Loosen two setscrews ! 3 , turn adjusting screw 1 and adjust
position B where the presser plate is closed to 1.5 mm. When
turning adjusting screw 1 clockwise, stopper cover !4 moves
in direction D and clearance B becomes larger. When turning
it counterclockwise, stopper cover !4 moves in direction E and
clearance B becomes smaller.
3) The closing amount subtracted clearance A of the
aforementioned 1.-5) from this clearance B is the cloth opening
amount.
B - A = cloth opening amount
4) Fix two setscrews !3 and further tighten adjusting screw 1.
* 3. The range of the mechanical adjustment of clearance B is
approximately 0 to 3 mm in the state of the standard
delivery. However, it is necessary to consider the
aforementiond * 1.
Results of Improper Adjustment
™ If clearance A is excessively
large, needle or throat plate and
presser foot or eyelet holding
plate will interfere with each
other. As a result, stitch failure
or damage of throat plate will be
caused.
™ If clearance A is excessively
small, particularly in case of
high-shrinkable fabric, flopping
occurs, causing stitch skipping
or uneven stitching.
™ If clearance B is excessivly
small, clearance C between
throat plate and eyelet holding
plate cannot be obtained,
causing the damage of throat
plate.
™ If the cloth opening amount (B -
A) is made small, the right and
l e f t o v e r e d g i n g w i l l b e
overlapped with each other,
causing the stitch failure.
™ If the cloth opening amount (B -
A) is made large, the fabric is
pulled more than required, and
not equally opened to the right
and left. As a result, deformation
of sewing pattern will occur.
™ If the cloth opening amount (B -
A) is not equal on the right and
left sides, the fabric moves to
o n e s i d e . A s a r e s u l t ,
deformation of sewing pattern
will occur.
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