Adjusting The Stitch Width Pm Arm And Backlashes Of The Stitch Base Line And Stitch Width Gears; Detecting The Origin Of The Stitch Base Line Stepping Motor - JUKI LBH-1700 Series Engineer's Manual

(5) Adjusting the stitch width PM arm and backlashes of the stitch base line and stitch
width gears
a) When the stitch width is "0" mm, the clearance provided between the frame and the stitch width PM arm
is 1 mm.
b) Stitch base line and stitch width stepping motor gears should run smoothly without backlashes.
Condition :
The needle bar should
be in the lower dead
point of its stroke.
Stitch base
line PM arm

(6) Detecting the origin of the stitch base line stepping motor

When the needle enters in the center of the needle hole in the throat plate, the stitch base line origin sensor
should detect the origin detecting plate.
Condition :
The needle bar rocking cam
should be on the stitch base
line side.
Needle bar
rocking cam
8 mm
(Figure observed from the front side of the sewing machine)
(Caution) The stitch base line stepping motor is the one with white connector. (Upper side)
Standard Adjustment
Stitch base line stepping motor
Stitch width stepping motor
Needle
Top surface of machine bed
Stitch width
PM arm
N e e d l e
hole
6
− −
Needle bar rocking cam is
on the stitch base line side.
Needle bar rocking cam is
on the stitch width side.
Origin detecting plate
Stitch base line
origin sensor