7. STANDARD ADJUSTMENTS

 

 

 

7-7. Adjusting the needle and rotary hook timing

 

 

 

The tip of the rotary hook (3) should be aligned with the

 

2290M

2291M

 

 

 

center of the needle (4) when the needle bar (1) moves up

 

 

 

1.8 mm (2.2 mm for –[]03A and –[]05 specifications) from its

 

 

 

lowest position to the position where reference line (b) is

 

0.5 - 0.7 mm

 

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 0.7 mm

 

 

 

at this time.)

<-[]03>

 

1. Turn the machine pulley to raise the needle bar (1) from

 

1.8 mm

 

its lowest position until reference line (b) is aligned with

<-[]05>

 

the lower edge of the needle bar bush D (2) as shown in

 

2.2 mm

 

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 - 0.05 mm.

 

 

 

3. Securely tighten the set screws (5).

3869M

S-7000DD

32