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Adjustment Procedures
1. Installation and pressure adjustment of presser and presser yoke
(1) Raise the presser shaft
shaft
, and tighten the setscrew
(2) Confirm whether the presser shaft
being free from rattling on the right and left.
If there is rattling on the right and left, loosen four setscrews
set up the presser shaft guide
by means of the right/left holding guide plate
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
adjusting nut
until pressure of the presser
o
Turning the pressure adjusting nut
to increase.
0
Turning the pressure adjusting nut
pressure to decrease.
(4) In order to make the presser
feed roller, loosen the setscrew
and move the presser shaft guide
of 0.8mm is secured between the lower hole face of the lever link
and the bottom face of the lever link hanger setscrew
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
lifter lever
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
until a clearance of 6.5mm is secured between the lower face "C" of
the mounting position of the presser shaft guide bush
upper face "D" of the stop collar
.
(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
and change the presser
Then, tighten the right and left setscrews
, mount the presser yoke
.
smoothly moves up and down,
to eliminate right and left rattling
.
clockwise causes the pressure
counterclockwise causes the
rise by 3.2mm faster than the upper
of the presser shaft guide
up and down until a clearance
with slide hole in the right direction. When
.
and move the stop collar
. Since then, tighten the setscrew
.
only, loosen the right and left setscrews
.
on the presser
to
. Make adjustments
and turn the pressure
is duly adjusted.
. (Lower
by moving the
,
up and down
and the
.
– 31 –
Results of Improper Adjustment
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.
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