HE-800A
5. TROUBLESHOOTING
109
5-9. Uneven seams (7) …… Loose thread end at end backtack
Cause
Check
Remedy
Page
Backtack
shape
Check the backtack
shape
Set the value for parameter No. 68 to 1.0.
* If the value is set to 1.0, the rear tack will change.
Instruction
manual
5-10. Uneven seams (8) …… Thread sticking out at end backtack
Cause
Check
Remedy
Page
Backtack
shape
Check the backtack
shape
Set the value for parameter No. 68 to 1.0.
* If the value is set to 1.0, the rear tack will change.
Instruction
manual
Work clamp pressure
Increase work clamp pressure.
* The standard height of the adjustment screw is
approximately 30 mm, so tighten it further than
this.
85
Work clamp
When using knit material, replace with the –3 work
clamp and needle plate.
-
Upper thread scissors
opening timing
Adjust to an appropriate opening timing.
94, 95
Upper thread scissors
operation
Apply grease to the inclined face of the opening
cam.
94
Uneven material
feeding
Lower thread clamp
opening timing
Adjust so that the lower thread clamp plate opens
when the feed mechanism moves 6 – 7 mm.
97
5-11. Uneven seams (9) …… Sticking in needle plate
Front and rear tack sections of material gets stuck in needle hole
Cause
Check
Remedy
Page
Start backtack
Number of start backtack
stitches
Use parameter number 40 to reduce the number of
stitches in the front tack.
* If the material is soft, it can be effective to set the
number of stitches to 0.
Instruction
manual
Rear tack
Rear tack vector shape
Use parameter number 37 to set the rear tack vector
shape to a rectangle.
* Setting the vector shape to a rectangle can be
effective when the width is less than the bar tack
width.
Instruction
manual
Needle plate
Needle plate
⋅
When using knit material, replace with the –3
needle plate.
⋅
Replace with a needle plate with a smaller needle
hole.
-
4004Q
1.0
4004Q
1.0
