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1. Installation and pressure adjustment of presser and presser yoke
(1) Raise the presser shaft , mount the presser yoke on the presser
shaft , and tighten the setscrew .
(2) Confirm whether the presser shaft smoothly moves up and down,
being free from rattling on the right and left.
If there is rattling on the right and left, loosen four setscrews to
set up the presser shaft guide to eliminate right and left rattling
by means of the right/left holding guide plate . Make adjustments
to permit the presser shaft to perform light movement up and down.
Since then, tighten the setscrew .
(3) Install the pressure adjusting leaf spring set and turn the pressure
adjusting nut until pressure of the presser is duly adjusted.
oTurning the pressure adjusting nut clockwise causes the pressure
to increase.
0Turning the pressure adjusting nut counterclockwise causes the
pressure to decrease.
(4) In order to make the presser rise by 3.2mm faster than the upper
feed roller, loosen the setscrew of the presser shaft guide
and move the presser shaft guide up and down until a clearance
of 0.8mm is secured between the lower hole face of the lever link
and the bottom face of the lever link hanger setscrew . (Lower
dead point of the needle bar)
(Caution) When the above-mentioned adjustments are made, the
connecting positions shall be secured for the lifter lever
with slide hole and the lifter lever by moving the
lifter lever with slide hole in the right direction. When
proper positioning has been secured, tighten the
setscrew .
(5) To secure the standard amount of rise of 6.5mm for the presser ,
loosen the setscrew and move the stop collar up and down
until a clearance of 6.5mm is secured between the lower face "C" of
the mounting position of the presser shaft guide bush and the
upper face "D" of the stop collar . Since then, tighten the setscrew
.
(Caution) At the same time, check the mounting position of the
needle thread rocking thread take-up bar connecting
base .
At the lower dead point of the needle bar, a clearance of
1.6mm shall be secured between the bottom face A of
the needle thread rocking thread take-up bar connecting
base and the upper face B of the cut section of the
front cover .
2. Removal and installation of presser only
(1) To replace presser only, loosen the right and left setscrews
and change the presser .
Then, tighten the right and left setscrews .
o If the amount of presser rise is too
excessive than required, the
presser will touch the needle
clamp, thus causing needle
breakage or stitch skipping.
o If pressure of the presser is too
insufficient or excessive than
required, the material cloth will
advance awkwardly.
Adjustment Procedures Results of Improper Adjustment
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