12. TROUBLESHOOTING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Problem

Cause

Remedy

 

 

 

Reference

 

 

 

 

 

 

 

Needle is too thin.

Select a needle that is suitable for the

P. 26

 

 

sewing conditions.

 

 

 

 

 

 

 

 

 

 

 

 

Hole diameter in needle hole plate is

Replace the needle hole plate with one

 

 

 

too small.

with a larger hole diameter.

 

 

 

 

Feed plate is too thin.

Use a thicker feed plate.

 

 

 

 

 

 

*Recommended thickness: 1.5 mm

 

 

 

 

 

 

 

Hole diameter of intermittent work

Replace the intermittent work clamp

 

 

 

clamp is too small.

with one with a larger hole diameter.

 

 

 

Sliding parts of outer rotary hook and

Lubricate the felts for the sliding parts

 

 

 

inner hook have little or no sewing

P. 20

 

 

of the outer rotary hook and inner hook.

 

Upper thread is not

machine oil.

 

 

 

 

 

 

 

 

tight.

Damage or burring in parts such as the

Repair the respective part by buffing it.

 

 

 

rotary hook, needle hole plate, needle

 

 

 

Alternatively, replace the part.

 

 

 

 

or thread path.

 

 

 

 

 

 

 

 

 

 

 

Lower thread tension is too strong.

Reduce the lower thread tension.

P. 26

 

 

 

 

 

 

 

 

Increase the upper thread tension.

 

 

 

Upper thread tension is too weak.

*Adjust the upper thread tension after

P. 26

 

 

 

adjusting the lower thread tension.

 

 

 

Thread take-up spring tension is too

Increase the tension

of

the

thread

P. 58

 

 

weak.

take-up spring.

 

 

 

 

 

 

 

 

 

 

 

Feed timing is too fast.

Retard the feed timing.

 

 

 

 

 

 

 

 

 

 

 

 

 

Intermittent height of intermittent work

Adjust the intermittent

height

of the

P. 38

 

 

clamp is too low.

intermittent work clamp.

 

 

 

 

 

 

 

 

 

 

 

Needle and rotary hook tip are

Adjust the driver needle guard.

 

P. 59

 

 

 

 

 

 

 

 

0573M

touching.

Adjust the needle clearance.

 

P. 60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lower thread is not

Lower thread tension is too weak.

Increase the lower thread tension.

P. 26

 

tight.

 

 

 

 

 

 

 

 

 

Upper thread tension is too strong.

Reduce the upper thread tension.

 

 

 

*Adjust the upper thread tension after

P. 26

 

0574M

 

adjusting the lower thread tension.

 

 

Poor seam finish on

 

Adjust the sub-tension so that the

 

 

underside of material at

Upper thread trailing length is too long.

upper thread trailing length after thread

P. 26

 

the sewing start.

 

trimming is approximately 40 mm.

 

 

 

Movable knife is blunt.

Replace the movable knife with a new

P. 63

 

 

one.

 

 

 

 

 

 

 

 

 

 

 

 

Fixed knife is blunt.

Sharpen the fixed knife

or replace it

P. 63

 

Upper thread trailing

with a new one.

 

 

 

 

 

 

 

 

 

 

length is irregular.

Sub-tension is too weak.

Adjust the sub-tension.

 

 

 

P. 26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread take-up spring tension is too

Increase the tension

of

the

thread

P. 58

 

 

weak.

take-up spring.

 

 

 

 

 

 

 

 

 

 

 

 

If using a heavy work clamp and feed

 

 

Pattern is distorted.

Work clamp and feed plate are too

plate, change the operation settings to

 

 

the settings for heavy-weight materials.

 

 

heavy.

 

 

 

Ask the place of purchase for details on

 

 

 

 

 

 

 

 

the setting method.

 

 

 

 

BAS-311H

80