– 61 –
6) Thread guide mounting position
1. Loosen the thread guide setscrew
.
2. Let the top surface of the thread guide
coincide with that of the
moving knife
and shift it fully in the direction of the arrow specified
in the drawing.
3. Tighten the thread guide setscrew
.
7) Adjustment of knife pressure
1. Turn the hand wheel by hand and adjust it to the lower dead point of
the thread take-up lever. Let the sewing machine fall down.
2. Actuate the [solenoid valve] manually and assume the state that the
thread trimming cylinder is pulled.
Press the manual switch No. 3 of the [solenoid valve] to assume the
locked condition.
[Refer to 3- (12) –13) Description of the solenoid valve.]
3. While the state of 2. above is maintained, slowly turn the hand wheel
by hand and adjust the distance to 29 to 30mm between the R part of
the moving knife
and the end surface of the bed.
(At that time, it is possible to use an accessory adjusting gauge.)
4. Loosen the moving knife setscrew
and make the blade surface of
the moving knife
contact with the blade point of the counter knife
. Since then, tighten the moving knife setscrew
again.
5. Unlock the manual switch of the [solenoid valve] that has been actuated.
Turning the hand wheel slowly bay hand, take out the thread trimming
cam rollers from the cam groove of the thread trimming cam.
*1 : If the knife pressure seems to be weak, lightly press the moving
knife
against the counter knife
at the time of adjustments
according to 4. above and tighten the moving knife setscrew
.
If the knife pressure is excessive, this will result in abrasion or
destruction of the blade. For this reason, the knife pressure should
be adjusted to the least minimum level.
*2 : If the thread cannot be cut even with high knife pressure, readjust
the height of the moving knife
or the counter knife
within the
possible range until the blade surface can fit properly.
Refer to 3-(12)-4) Moving knife (Adjustment of vertical positioning)
and 3-(12)-5) Counter knife (Adjustment of vertical positioning).
*3 : After the adjustment of knife pressures, make readjustments
according to 3-(12)-8) Moving knife driving arm and initial position
of the moving knife, 3-(12)-9) Adjustment of gap between the
moving knife driving arm and the moving knife driving arm stopper,
and 3-(12)-10) Mounting position of the moving knife return plate.
2.4
43.0
Adjustment Procedure
Results of Improper Adjustment
Adjusting gauge (accessory)
(t = 0.6)
29.0
26.8
37.8
9.0
