HIGHLEAD GC24818-1D, Instruction Manual

Page: 8 / 30

Loosen the stop screw, adjusting the stopper block, After the adjustment, be sure to tighten the set screw.
The standard stroke of thread take-up spring is from 6mm to 8mm.
9.Adjustment of thread tension regulator
（
Fig. 16
）
—
5
—
1
）
Adjustment of thread tension
regulator setting position. The
standard gap is about 0.5mm when
the tension release cam salience is in
contact with the tension release pin.
To adjust, loosen screw A and change
position of the thread tension
regulator properly.
２）
Tension release timing adjustment. The tension release cam should
be set so that the tension release disks come to close at the time the needle
plunges into the throat plate.
10.Presser foot pressure adjustment
（
picture 17
）
Loosen the pressure adjusting screw lock nut and turn the pressure
adjusting screw
③
. Turn the screw clockwise to increase the pressure. Turn
the screw counter-clockwise to decrease the pressure.
Note: Do not change setting of screw
④
. If the screw is too tight,
clapping noise may occur during operation.
11.Adjustment of presser foot height
（
picture 17
）
１）
Height of presser foot
The standard height of the presser foot at its lowest position is 1.0 mm
measured between the presser foot bottom surface and the throat plate top surface (see the detail of part ”A”).
To adjust the height of the presser foot, loosen the set screw
②
used to secure the presser bar guide
bracket and vertically move the presser bar.
２）
Stroke of presser foot
loosen screw
①
and adjust position of presser bar lifting bracket so
that the presser foot starts going up when the needle point reaches
0.5mm-1.0mmabove the presser foot bottom surface.(When this adjustment
is made, the height of the presser foot at stop of the machine is about
26.5mm over the throat plate.)
12.Timing of hook and needle(Fig.18)
１）
When the needle is at 2.2mm above its lowest position, the hook