Adjustment Of Meshing Pressure Between The Movable Knife And The Fixed - Mitsubishi Electric PLK-J4040R Technical Manual

7-5-2. Adjustment of meshing pressure between the movable knife and the fixed knife.
(1) Loosen the fixed knife bracket clamp bolt (No.1).
(2) Adjust meshing pressure by turning the up and down adjusting screw (No.2), and tighten the bolt
(No.1). In advance much loosen the meshing pressure by loosening the adjusting screw (No.2) then
tighten little by little so that the meshing pressure increase.
(3) Confirm the movable knife (No.1) movement by rotating the trimmer cam slowly. If the trimmer cam
does not move smoothly, please loose the meshing pressure.
(4) After adjustment, tighten the fixed knife bracket clamp bolt (No.1). At this time, please check the
meshing pressure increased or not. If increased, please readjust the meshing pressure. It is
recommended that the fixed knife bracket clamp bolt (No.1) loose a little.
(5) Trim the actual thread manually by hooking a peace of needle and bobbin thread (No.7) referring the
following figure. If both thread does not trimmed sharply, please readjust above procedures.
NOTE Since overpressure causes a large torque on the thread trimmer mechanism and trimming failure,
fixed knife breaking adjust so that the thread can be trimmed with the minimum pressure.
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<1>: Clamp bolt <2>: Adjusting screw <3>: Fixed knife <4>: Fixed knife saddle
<5>: Hexagon wrench 2.5 <6>: Movable knife <7>: Needle and bobbin thread
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