Mitsubishi Electric PLK-J10050RH, Technical Manual

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6. STANDARD ADJUSTMENT
CAUTION
(1) Please make sure to turn the power switch off before adjusting the sewing machine.
(2) When adjusting the sewing machine with the power switch on, please be careful not to step on the
foot switch by mistake.
(3) Please be careful not to be injured by a sharp part such as the needle and the hook point.
(4) Please make sure to put the safety guards (eye guards, link covers, and finger guards or the others)
back on the initial position after the sewing machine adjustment.
6-1. Adjustment of the needle bar position
(1) Turn the power switch off then, remove the presser foot attaching screw (No.1) and nut (No.2) and
remove the presser foot (No.3).
(2) Turn the hand pulley (No.4) by hand in the direction of arrow and stop the needle bar (No.5) at the
lowest position.
NOTE The needle shaft and the hook shaft are controlled by synchronous operation only when the power
switch is on. In this reason, there is a risk that the needle may collide with hook when down the needle bar
without removing the needle.
(3) Make sure the clearance between the bottom of needle bar (No.5) and top of the needle plate is 23.5
mm.
(4) If it is not correct, remove the face cover and eye guard then loosen the two of needle bar holder set
screw (No.7) and adjust the needle bar position. For removing the face cover and eye guard, please
refer to the paragraph [7-2. Adjustment of the detector position of the presser foot unit]
<1>: Presser foot
attaching screw
<2>: Nut
<3>: Presser foot
<4>: Hand pulley
<5>: Needle bar
<6>: Needle plate
<7>: Needle bar holder
set screw
N eedle bar
lowest position
<2>
<3>
<4>
<1>
<7>
23.5 mm
<5>
<6>