ZOJE ZJ781-BD Manual de usuario
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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