JUKI LU-2810 - 20. NEEDLE-TO-HOOK RELATION

–20–
20. NEEDLE-TO-HOOK RELATION
1) Adjustthestandardfeedadjustingdialto"0".
(Caution 1)
2)
Loosenhookdrivingshaftsetcollarclampingscrew
❸
,andturnthehandwheelcounterclockwiseto
maketheneedlebarascendby2.3mmfromthelowestpositionofitsstroke.
3) Inthestatedescribedin2),alignbladepoint
❶
ofthehookwiththecenterofneedle
❷
,andtighten
hookdrivingshaftsetcollarclampingscrew
❸
.Atthistime,aclearanceof1.5mmisprovidedbe-
tweenthebladepointofthehookandthetopendoftheneedleeyelet.
4) Loosensetscrews
❹
and
❺
ofthehookdrivingshaftsaddleonthetopfaceofthebed.Adjusttheclear-
ancebetweenthebladepointofthehookandtheneedleto0.05to0.1mmbymovingthehookdriving
shaftsaddletotherightorlefttochangeitsposition.Then,tightensetscrews
❹
and
❺
.
5) Alignthelargestscalemarkofthestandardfeedadjustingdialwiththemarkerdotonthemachinearm.
Checktobesurethatthebladepointofthehookdoesnotcomeincontactwiththeneedle.
1. If stitch skipping and thread breakage occur when using elastic thread such as vinylon, adjust the
hook timing with the pitch used for sewing.
2. The operation panel could come in contact with the thread stand when tilting the machine head.
To protect the relevant parts from contact, shift the thread stand to a position at which the thread
stand does not interfere with the control panel.
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.
❷
❶
❸
❹
❺
0.05 to 0.1 mm
1.5 mm
2.3 mm
[Only for the LU-2810-7 and LU-2860-7]
To check the needle bar position as described in the aforementioned 2) [i.e., "...the needle bar ascend
by 2.3 mm from the lowest position of its stroke"], you may use the display of the main shaft rotation
angel under the "machine head adjustment mode" of the SC-922.
Increase the numerical value displayed when the needle bar is in its lowest position of its stroke under
the "machine head adjustment mode" by 25 degrees of an angle, the needle bar goes up by 2.3 mm.
(When the needle bar ascends by 2.3 mm from its lowest position of its stroke, th e main shaft rotation
angle is 25 degrees of an angle.)
* In the case of adjusting the needle-to-hook relation under the "machine head adjustment mode", do
not press
switch.
Refer to "II-10. Adjustment of the machine head" in the Instruction Manual for the SC-922 for the ma-
chine head adjustment mode.