21
6.4) Hook Lubrication Adjustment
A. Lubrication Volume Check
a. Conduct idle operation for some 3 minutes (at an
appropriate speed). Place the lubrication test sheet as
in the figure and operate the machine for 5 seconds
to check lubrication. Check oil volume sprayed to the
sheet.
b. Conduct the lubrication testing three times. If the oil
strip remains within the maximum and minimum
range, the lubrication is deemed proper (If
lubrication is too small, hook operation might not be
smooth, If lubrication is too much, the oil may stain
the fabric.)
B. Lubrication Volume Adjustment
Turn the lubrication volume adjusting screw
①
on the
lower shaft front bushing clockwise (+ direction), and
then lubrication volume increases. If it is turned counter-
clockwise (- direction), lubrication volume decreases.
Hook
Lubrication test sheet
Oil strip
Oil strip
Max. limit
Decrease
Increase
①
①
①
①
Weaker
Stronger
Stronger
Weaker
Min. limit
6.5) Puller (upper) Pressure Adjustment
If the pressure adjusting screw
①
is turned clockwise,
pressure gets stronger, and vice versa.
After adjustment is complete, the fixing nut
②
must be
fastened.
6.6) Presser Foot Pressure Adjustment
Turn the pressure adjusting nut
①
clockwise to increase the
pressure, and turn it counter-clockwise to decrease the
pressure.
[Fig. 25]
[Fig. 26]
[Fig. 27]