Adjusting The Needle And Feed Mechanism Timing; Adjusting The Needle And Rotary Hook Timing - Texi ART AUTO User Manual

9.4 Adjusting the needle and feed mechanism timing

9.5 Adjusting the needle and rotary hook timing

EN TEXI ART AUTO operation manual
The illustration at left shows the standard position
for the needle tip when the feed dog (1) is lowered
from its highest position until it is flush with the top of
the needle plate (2).
1. Remove the rubber cap (3).
2. Loosen the two set screws (5) of the vertical cam
(4), and then turn the vertical cam (4) slightly to ad-
just the timing and tighten the screw.
- To advance the needle timing, turn in the direction
of <A>. To retard the needle timing, turn in the direc-
tion of <B>.
- To prevent material slippage from occurring, retard
the needle timing. (Fig.[B])
· To improve thread tightening, advance the needle
timing. (Fig.[A])
NOTE: If the vertical cam (4) is turned too far in the
direction of <A>, it may cause the needle to break.
The tip of the rotary hook (3) should be aligned with the center of the
needle (4) when the needle bar (1) moves up 1.8mm (2.2 mm for H) from
its lowest position to the position where reference line (b) is aligned with
the lower edge of the needle bar bush (2) as shown in the illustration.
(The distance from the upper edge of the needle hole to the rotary hook
tip will be 0.5 to 0.7mm at this time.)
1. Turn the machine pulley to raise the needle bar (1) from its lowest
position until reference line (b) is aligned with the lower edge of the
needle bar bush D (2) as shown in the illustration.
2. Loosen the set screws (5), and then align the tip of the rotary hook (3)
with the center of the needle (4). The distance between the tip of the
rotary hook (3) and the needle (4) should be approximately 0-0.05mm.
3. Securely tighten the set screws (5).
42