Timing Of Thread Tension Release; Setting For 2- Or 4-Hole Buttons - JUKI MB-1373 Instruction Manual

3-11. timing of thread tension release

B
A
Phenomenon
1.When the sttch made on the wrong sde of the
workpece s too loose ;
2.When the thread s broken at the tme of stop-moton ;
3.When the thread s 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 lengthwse feed
adjustng lever 1 and set t to
"0" for 2-hole buttons or a cor-
respondng amount for 4-hole
buttons.
★ crosswise feed
Loosen nut 2 and set sec-
ton A of ponter 3 to a
correspondng amount. Then
tghten nut 2 .
Turn the needle drvng pulley as you draw the thread n the drec-
ton of arrow mark A and you will find a point at which the tension
dscs on the tenson post No. 2 release the thread. At ths moment,
the standard dstance from the top end of the needle bar bushng
(upper) to the top end of the needle bar s 44 to 47 mm (n case of
the needle of TQ X 7, 54 to 57 mm).
Perform the followng adjustments especally when the undermen-
toned troubles occur frequently.
Loosen nut 1 , nsert the blade of a screwdrver to the top slot of
1
the tenson post No. 2 and turn t n the drecton of arrow mark B
to lower the height of the thread floating bar and in the opposite
drecton to rase the heght.
2
3
A
[In case of MB-1377]
★ Lengthwise feed
Push down lengthwse feed adjustng lever 1 and set t to "0" for -2-hole
buttons or a correspondng amount for 4-hole buttons by the respectve
procedures below accordng to the sewng methods.
X sttch : Set the lengthwse feed adjustng lever to the poston corre-
spondng to the amount for the button wthn the range of a.
U-sharp sttch : Set the lengthwse feed adjustng lever to the poston cor-
respondng to the amount for button wthn 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 secton A of ponter 3 to a correspondng amount.
Then tghten 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 slghtly hgher.
Make the needle bar slghtly lower.
Make the needle bar slghtly lower.
Measure the dstance between two
holes n a button and set equally cross-
wse and lengthwse 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).