Timing Of Thread Tension Release; Setting For 2- Or 4-Hole Buttons - JUKI MB1373 Instruction Manual

3-11. Timing of thread tension release

B
A
Phenomenon
.When the stitch made on the wrong side of the
workpiece is too loose ;
2.When the thread is broken at the time of stop-motion ;
3.When the thread is broken frequently ;

3-12. Setting for 2- or 4-hole buttons

WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
MB-1377
1
B C A
[In case of MB-1373]
★ Lengthwise feed
Push down lengthwise feed
adjusting lever 1 and set it to
"0" for 2-hole buttons or a cor-
responding amount for 4-hole
buttons.
★ Crosswise feed
Loosen nut 2 and set sec-
tion A of pointer 3 to a
corresponding amount. Then
tighten nut 2 .
Turn the needle driving pulley as you draw the thread in the direc-
tion of arrow mark A and you will find a point at which the tension
discs on the tension post No. 2 release the thread. At this moment,
the standard distance from the top end of the needle bar bushing
(upper) to the top end of the needle bar is 44 to 47 mm (in case of
the needle of TQ X 7, 54 to 57 mm).
Perform the following adjustments especially when the undermen-
tioned troubles occur frequently.
Loosen nut 1 , insert the blade of a screwdriver to the top slot of
1
the tension post No. 2 and turn it in the direction of arrow mark B
to lower the height of the thread floating bar and in the opposite
direction to raise the height.
2
3
A
[In case of MB-1377]
★ Lengthwise feed
Push down lengthwise feed adjusting lever 1 and set it to "0" for -2-hole
buttons or a corresponding amount for 4-hole buttons by the respective
procedures below according to the sewing methods.
X stitch : Set the lengthwise feed adjusting lever to the position corre-
sponding to the amount for the button within the range of A.
U-sharp stitch : Set the lengthwise feed adjusting lever to the position cor-
responding to the amount for button within the range of B.
When setting the lengthwise feed adjusting lever to the position of
C (outside of range of setting the lever), not only the sewing cannot
be performed but also trouble will be caused. Do not set the feed
adjusting lever at the position of C.
★ Crosswise feed
Loosen nut 2 and set section A of pointer 3 to a corresponding amount.
Then tighten nut 2 .
Before operating the machine, ensure that the needle enters the
center of each hole in the button.
Height of thread floating bar
Make the needle bar slightly higher.
Make the needle bar slightly lower.
Make the needle bar slightly lower.
Measure the distance between two
holes in a button and set equally cross-
wise and lengthwise feed regulators for
4-hole buttons.
– 7 –
Perform the adjustment after
confirming that the sewing
m a c h i n e i s l o c a t e d a t t h e
position of the stop-motion (refer
to "3-14. Adjusting the position
of the stop-motion", p.8.).