6
【
7
】
ADJUSTING THE SPEED CONTROLLER AND AIR PRESSURE
■
Speed controller F controls the speed when the thread
trimming knife carriers protrude.
Speed controller G controls the speed when the thread
trimming knife carriers retract. If the screw for F is too
loosened, the carriers will protrude too fast and then the
position of the lower knives will become unstable, causing
cutting error. If the screw for G is too loosened, the
carriers will retract too fast and then the looper threads
may not be held properly. The speed controllers are
factory-set (see the illustration in [6] ).
【
8
】
ADJUSTING THE PRESSER FOOT LIFT
■
The foot lift should be 7mm above the top surface of the
needle plate. To make this adjustment, loosen screw D
for crank lever C and then set the clearance between slot
A on the presser bar clamp connection plate and screw B
at 0.5~1mm.
■
When the air cylinder on the pneumatic presser foot lift
gets actuated, the presser foot lift should be 7mm above
the top surface of the needle plate.
To make this adjustment, position stopper E so that lever
G cannot be lowered. After stopper E has been
positioned, secure stopper E with nut F.
< Note >
Set the regulator at 4~5kgs/cm
2
. To decrease the pressure,
turn the adjusting knob clockwise. Too fast speed will give a
shock to the knife carriers. Then the threads will be cut
before they are cut by the knives or the threads will not be
held properly. It may cause trouble.
