typical GC2605, Инструкция по эксплуатации и каталог запасных частей

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It is a common practice to check the bobbin thread
tension as shown in Fig.21. In case of polyester thread
14 tex(42s), hold the end of the thread and vibrate the
bobbin case up and down. If the bobbin case falls down
slowly, the proper tension is obtained. The needle
thread tension can be adjusted by changing tension of
the thread take-up spring, sewing range of the thread
take-up spring, tension of tension disc, and the position
of thread guide, all these adjustments will be described
as follows.
5.1 Adjusting the thread take-up spring
The normal tension of the thread take-up spring is
approx.25g. And the normal swing rage of the thread
take-up spring is 5-8mm. For sewing light weight
materials, weaken the spring tension and widen the
swing range of spring, while for sewing heavy weight
material, strengthen the spring tension and shorten the
swing range of spring.
5.1.1Adjusting the thread take-up spring tension(Fig.22)
Loosen tension stud set scerw A, turn tension stud
B clockwise to make the spring get more tension,or turn
the tension stud counter-clockwise to make the spring
get less tension. After adjustment, be sure to tighten
tenion stud set screw A. The thread take-up spring
tension is about 25g. The method of adjustment is
to loose set screw A first , then to turn tension stud B
counter-clockwise to release the tension of thread take-
up spring C to zero,and to turn tension stud B clockwise
until spring C just comes into contact with the stopper
on the thread take-up spring regulator, then to further
turn tension stud B clockwise by 1/2 turn. After
adjustment, tighten tension stud set screw A.
5.1.2 Adjusting the swing range of thread take-up
spring (Fig.23)
Loosen set screw B, turn tension complete C
clockwise to increase the swing range or turn tension
complete C counter-clockwise to decrease the swing
range. After the adjustment, tighten set screw B.
Before delivery, the thread take-up spring is
properly adjusted. Readjustment is needed only in the
case of sewing special material or with special thread.
22
A
B
C
23
A
B
C
D
5-8mm
20
A
max
min
21
B
A
bobbin