Operation
28 Operating Instructions 745-35-10 S/745-35-10 A - 03.0 - 04/2017
4.9.2 Setting the bobbin thread tension
Fig. 17: Setting the bobbin thread tension
Setting the braking spring
In case of a positioned stop of the machine head the braking spring avoids
an after-run of the bobbin thread reel.
To set the braking spring:
1. Set the braking spring (4) by alignment.
The brake power is set properly when the braking spring (4) protrudes
from the flat (1) by approx. 1 mm.
2. When setting the leaf spring (3) take the brake power into consideration.
Setting the leaf spring
To set the leaf spring:
1. Start by setting the tension of the leaf spring (3) to a minimum level
using the adjusting screw (2).
• Increase the bobbin thread tension: Turn clockwise
• Reduce the bobbin thread tension: Turn counterclockwise
With the bobbin inserted and the bobbin thread threaded through the
throat plate a uniform and easy pull-off must be assured.
(1) - Flat
(2) - Adjusting screw
(3) - Leaf spring
(4) - Braking spring
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