ZOJE ZJ781-BD Manuale utente

Service Manual

Buttonhole machine

ZOJE

ZJ781-BD

Table of Contents

1. The height of the needle bar

2. The cooperation of the needle and the hook

3. Matching of the baseline adjustment handle

4. The needle bar cooperation

5. The adjustment of the needle drop

6. The height of the needle bar swing fork

7. The position of the under feeding crank

8. Front and rear position of the presser foot

9. Cutter falling time

10. The position of the cutter falls

11. Knife of action hook position

12. Adjustment of the stop device

13. Start the position of the security hook

14. The amount of back and forth movement of the upper knife

15. Left and right position of the upper knife

16. Height of the upper scissors

17. The position of the roll into the upper thread at the start of sewing

18. The time when the scissors are opened

19. Adjustment of the limit plate

20. Safety crank adjustment

21. Upper scissors spring pressure

22. Fixed knife position

23. Height of the presser plate

24. Low speed bump position

25. Starting lever and starting ram position

26. Belt adjustment

The adjustment of other parts

1. Adjust the position of the left and right stitches according to the width of the hole:

2. Adjustment of the tension opening time

3. Adjustment of the wiper

4. Adjustment of thread adjustment hook

5. Lower thread lever adjustment

6. Lower thread tension spring

7. Adjustment of the bobbin pressure bar device

1. The height of the needle bar:

Adjustment requirements:

When the needle bar is at the lowest point, the distance between the lower end surface of the

needle bar and the upper plane of the needle plate is 11.9 mm.

Adjustment method:

(1) Insert the positioning ruler between the needle bar and the needle plate, loosen the needle bar,

and tighten the screws to adjust.

Note: the needle should fall in the center of the needle plate.

The phenomenon when the adjustment value changes:

When sewing elastic fabric, the needle bar is lowered a little more than the standard value, and

the effect is better.

2. The cooperation of the needle and the hook:

Adjustment requirements:

When the needle bar is lifted by 2.3mm from the lowest point, the center of the hook tip and the

needle should be the same, and the upper end of the needle eye is 1.6~1.8mm; the lateral gap

between the needle and the hook tip is about 0.05mm.

Adjustment method:

(1) With the needle bar rising from the lowest point, place the positioning scale 2 between the

needle bar and the needle plate, and then loosen the set screw of the hook sleeve to adjust.

(2) At this time, adjust the lateral clearance of the needle and the hook tip to about 0.05 mm, and

swing it to the left and right to check and not touch.

(3) At this time, adjust the gap between the hook positioning hook and the hook to 0.5mm, and

loosen the screw of the hook positioning hook to adjust. (Keep the line pass smoothly)

The phenomenon when the adjustment value changes:

(1) When sewing elastic fabric, slow down the cooperation time of the hook to the needle, and

the effect is better. (The distance between the tip of the hook and the upper end of the needle eye

is about 1.0mm)

3. Matching of the baseline adjustment handle (adjusting the parallel gap between the

cutter and the left and right amplitudes)

Adjustment requirements:

(1) Position of the parallel portion on the left side: The lower end of the left baseline adjustment

screw is 10 mm from the upper plane of the baseline adjustment handle, and the lower plane of

the baseline adjustment handle is exposed to be about 1 mm.

(2) Position of the right parallel portion: The adjustment of the right baseline should be adjusted

to the A=B position according to the amplitude of the parallel portion.

Adjustment method:

(1) Adjustment of the left baseline should be performed when the needle falls in the center of the

needle plate hole. The distance between the lower end of the left baseline adjustment screw and

the plane above the baseline adjustment handle is approximately 10 mm, which is adjusted by

the left baseline adjustment screw

(see figure).

(2) The adjustment of the right baseline is performed with the right baseline adjustment screw.

(3) Adjust the left and right baselines so that the cutter falls in the center of the parallel

portion.

(4) Adjustment order of amplitude and baseline: 1 change of course amplitude 2 Observation

of the distance between the inside of the amplitude of the right course and the falling point of the

cutter 3 Adjusting the position of the right baseline 4 Adjusting the amplitude of the

reinforcement

The phenomenon when the adjustment value changes:

When adjusting the left and right baselines, it is biased toward either side, and the stitches

adjacent to the parallel portion of the cutter may be biased to the inner side.

When the amplitude is increased, the left parallel portion is individually biased to the left.

4. The needle bar cooperation:

Adjustment requirements:

(1) When the needle is at the top center, the engraved line of the pinion gear should be aligned

with the center of the lower shaft.

(2) If there is no engraving on the pinion gear, when the needle bar is at the lowest point, the

center of the oil hole on the convex arc of the large arc of the needle pendulum (ie the center of

the convex arc of the cam) is aligned with the needle bar. Swing the left side of the plane (viewed

from the front).

Adjustment method:

Loosen the fixing screw of the pinion gear to adjust the above standard adjustment value.

Pay attention to the axial movement of the lower shaft when adjusting. Confirmation method

after adjustment: pad the paper at the needle drop and turn the pulley by hand to observe whether

there is a lateral flow needle phenomenon on the needle drop point on the paper, that is, to ensure

that the swing of the needle before the needle bar is lowered to the front of the puncturing cloth

should end.

The phenomenon when the adjustment value changes:

When the reticle is missed, it will cause the needle to flow, the needle to break, and the needle to

jump.

5. The adjustment of the needle drop (for the needle board)

Adjustment requirements:

When sewing the parallel portion on the left side, the swing fork is at the leftmost end when the

needle is lowered to the middle portion of the needle plate hole.

Adjustment method:

When the position of the needle bar swing fork is normal, and the needle drop point is not

correct, the tightening screw of the crank shaft after the swing shaft can be loosened to be

corrected.

The phenomenon when the adjustment value changes:

If the needle drop point is wrong, it will increase the needle swing amplitude, and the inaccurate

one will hit the needle plate hole and cause the needle break or thread break.

6. The height of the needle bar swing fork

Adjustment requirements:

When the machine is in the parking position (the

needle is in the left needle position), the distance

from the large arc of the needle cam to the top of

the needle bar swing fork is about 5 mm.

Adjustment method:

When the machine is in the parking position (the needle is in the left needle position), loosen the

fastening screw on the baseline adjustment handle, push down the needle bar swing fork, so that

the large arc of the needle swing cam is convex to the top of the needle bar swing fork About

5mm, adjust the shank to the baseline adjustment shank, and then tighten the baseline adjustment

shank.

Note: When making this adjustment, please remove the spring of this mechanism and adjust it.

Check if the needle-swing cam of the needle-spindle gear rotates smoothly.

The phenomenon when the adjustment value changes:

If the height of the needle bar swing fork is not accurate, the width of the left and right courses

will be different.

7. The position of the under feeding crank

Adjustment requirements:

Even if the sewing size (adjustment button hole length) is changed, the position of the

presser foot does not change during parking, and the position of the feed carriage does not change.

Adjustment method:

Rotate the main cam with the manual feed handle. When the main cam engraving line is aligned

with the center of the roller pin screw of the feeding lower crank, loosen the fastening screw of

the lower crank and then loosen the button hole length nut. When the plate moves to a distance

of 2.5mm from the needle plate (see picture), move the button hole length adjustment screw in

the arc groove of the feed crank body. If the presser foot does not move back and forth, the

position of the crank under the feed is correct. When the crank body does not move, tighten the

fastening screw of the lower crank.

The phenomenon when the adjustment value changes:

If the position is wrong, whenever the sewing size is changed, the action of the scissors will

fail, and the position of the presser foot will also change, causing a broken needle or thread

broken.

8. Front and rear position of the presser foot

Adjustment requirements:

The gap between the center of the needle drop hole and the inner end surface of the presser foot

is 2.5 mm (when the vehicle is parked), and the presser foot plate is located at the same position

on both sides of the needle blade slot.

Adjustment method:

When the machine is in the parking position, loosen the fastening screws of the pallet to adjust.

Confirmation after adjustment: Please confirm that the lifting arm is

perpendicular to the bottom plate.

The phenomenon when the adjustment value changes:

(1) If the position of the presser foot is not accurate, the front and rear positions of the presser

foot are not accurate, and the opening and closing action of the upper scissors action plate is

affected.

(2) When the parking is stopped, the gap between the center of the needle hole and the presser

foot is too small. When the sewing machine is in contact with the presser foot during sewing, the

thread is broken and the needle is broken.

9. Cutter falling time

Adjustment requirements:

After the sewing machine is completely decelerated, it will fall 2~3 before the stop (1 2 3 pin is

the reference).

Adjustment method:

Move the cutter action bump position and adjust the cutter fall time to 2~3 stitches before the

sewing machine stops.

Moving in the direction of the mark, the cutter falls early.

Note: When the number of stitches is adjusted to 93 or less, adjust the low speed bumps.

The phenomenon when the adjustment value changes:

When the cutter is operated during high-speed operation, the cutter will not fall, and the cutter

will be accelerated.

10. The position of the cutter falls

Adjustment requirements:

Should fall in the middle of the needle plate slot.

Adjustment method:

Loosen the needle plate seat fastening screw and move the needle plate seat position to adjust.

The phenomenon when the adjustment value changes:

When the position is wrong, the cutter hits the needle plate.

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