Service manual

Adjusting the thread regulator

30 Service manual 512/532 Version 00.0 - 12/2013

9 Adjusting the thread regulator

The thread regulator determines the needle thread quantity to be guided

around the hook. The required thread quantity depends on the thickness

of the material to be sewn, thread strength, and stitch length.

Larger thread quantity for

• thick material

• high thread strengths

• large stitch lengths

Lower thread quantity for

• thin material

• low thread strengths

• small stitch lengths

Checking the correct setting

Open the hook flap ( Section 3.3.7, page 14) and observe the thread

running around the hook:

 The needle thread loop runs without surplus and without jumping

around the largest hook diameter.

Faults caused by an incorrect setting

• Poor sewing results

Figure 24: Adjusting the thread regulator

Adjusting steps

1. Turn the handwheel and observe the run of the thread around the hook.

2. Loosen the fastening screw (2).

3. Move the thread regulator (1):

• Larger thread quantity: Turn the regulator counterclockwise

• Lower thread quantity: Turn the regulator clockwise

4. Tighten the fastening screw (2).

(1) - Thread regulator

(2) - Fastening screw