5-5. Replacing the bobbin case and threading the thread; 5-6. Sewing conditions and thread tension; 5-6-1. Sewing conditions- Page 19

5. CORRECT USE

BAS-341F, 342F

12

5-5.  Replacing the bobbin case and threading the thread

CAUTION

If the power switch needs to be left on when carrying out replacing the bobbin, be extremely careful to observe
all safety precautions.
The machine may operate if the foot switch is depressed by mistake, which could result in injury.
(ex. Continuing sewing from a stopping point)

1. Pull the shuttle race cover (1) forward and then open the cover.
2. Lift the bobbin case latch and remove the bobbin case.
3. Insert a new bobbin into the bobbin case, and then pass the thread through the slot (2) and pull it out from the thread

hole (3). Check that the bobbin turns in the direction of the arrow when the thread is pulled at this time.

4. Pass the thread through the lever thread hole (4), and then pull out approximately 30 mm of thread.

5-6. Sewing conditions and thread tension

5-6-1. Sewing conditions

Specifications

For heavy materials

For medium materials

Upper thread

# 20 or equivalent

# 50 or equivalent

Lower thread

# 20 or equivalent

# 60 or equivalent

Upper thread tension (N)

1.5 - 2.0

0.5 - 1.0

Lower thread tension (N)

0.2 - 0.4

0.2 - 0.4

Thread take-up spring height

8 - 10 mm

6 - 8 mm

Thread take-up spring tension(N)

1.5 - 2.0

0.4 - 0.6

Needle

DP X 17 # 21

DP X 5 # 16

Normal sewing speed

2000 rpm

2000 rpm

The sewing conditions given in the above table may need to be changed depending on the article being sewn.

1936S

0110Q

(3)

(2)

1202S

30 mm

(4)