JUKI 35800 Series, Engineer'S Manual

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(5) Adjusting the height of the needle bar
Alignment
1. Height of the needle bar
(1) Alignment between the bottom surface of the front looper and the top hole end of the left needle
When the pulley is rotated counterclockwise and the bottom surface of the front looper is aligned with
the top hole end of the left needle , the standard needle bar height is achieved by adjusting the
distance from the tip of the front looper to the right surface of the left needle to 0.8 mm.
(2) Alignment between the tip of the front looper and the left surface of the left needle
When the pulley is rotated counterclockwise and the tip of the front looper is aligned with the left
surface of the left needle , the standard needle bar height is achieved by adjusting the distance from
the bottom surface of the front looper to the top hole end of the left needle to 1.6 mm.
(Caution) For adjusting the needle bar height, select an easier-to-adjust one from either (1) or (2)
mentioned above.
(3) Checking of the middle and rear looper heights shall be also checking of each looper return.
(Caution) 1. Needle entry adjustment is performed in accordance with the temporary needle bar
height.
When the needle bar is at the upper dead point, the temporary clearance between the
top surface of the throat plate and the tips of the needles is 12.5 mm.
2. The needle bar height is temporarily adjusted for needle enty adjustment. If there is no
problem with the needle bar height, readjustment of the needle bar height is not required.
Advance to the next step.
0.8 mm
Right surface of
the left needle
Alignment between the bottom surface of the
looper and the top hole end of the needle
Alignment between the tip of the looper and the
right surface of the needle
Alignment
1.6 mm
Right surface of
the left needle
Temporary needle bar height
Top surface of the throat plate
12.5mm
Standard Adjustment