3. ZJ5780 series high speed computerized lockstitch buttonholing machine
ZJ5780S:Suitable for all kinds of shirts, overalls, such as cotton material buttonhole sewing，woven materials。
ZJ5780K：Suitable for knitting materials, elastic materials form variables such as larger buttonhole sewing materials。
ZJ5780L:A kind of special presser foot series configuration 120 mm button flat sewing machine, has a strong function of continuous sewing and circular sewing.

4. ZJ5780 adjustment and maintenance
ZJ5780The main features： 1、Using the stepper motor and synchronous belt drive，lower noise 2、Electronic thread clamp device, make more balanced in the tension of each line 3、Repeated cutting, just set a parameter can be according to the need for several cutting

5. Positioning needle bar height
The height of the needle bar, the height of the needle bar set is different according to different fabrics,
standard S = 11.4 mm,
knitting K = 9.6 mm.
The factory is equipped with a gauge,
1 is the lowest position,
2 is hook start working position
12mm 2 1

6. needle and hook‘s position
adjust：when finish setting the needle bar lowest position, the needle bar rise to gauge "2" position, make the hook tip in the center of the needle groove ，means the hook tip on the top of the needle hole 1.6～1.8mm。 needle groove and hook tip distance is 0.01～ 0.04mm。finished ,tighten the screws
hook start working position
adjust screw

7. Cutter replacement screw knife size
Replace directly to loosen the screw ,when you change the knife ,pay attention the knife should be fallen in the center of the needle plate，the knife blade should be higher than the needle plate 1 ~ 2 mm. when you need to change the knife , directly to loosen the screw ,make the knife fall in the lowest place ，then make the knife is flush with the needle plate.fastening the screw。and according the knife size adjust the parameter U18（parameter you can check with the manual）
knife size
screw
1 ～2mm

8. The function of the cutter
Incised on the button holing machine, knife quality, directly affects the performance of the use.Get a up (or down) cutting knife, make the knife to open and close ,check the strength of the knife .And then watch the clamp line performance, it is required clamp the line first then cutting , Requirement is first line between the principle of tangent, look from the cutter, thread clamp in the leading edge of spring plate at least more than fixed knife more than 1 mm, that is to say, when the moving knife and fixed knife in front of the mesh, the face of the moving knife with leaf spring has been around 1 mm mesh, but also for leaf spring and moving knife meshing surface without any gaps

9. The origin of the needle bar adjustment
open the machine，press the bobbin wiper button ,the needle will find the origin automatically，make the needle bar in the center of the plate。if it is not in the center ，please loosen the screw ，move the needle bar to the center ，and fasten the screw （you need open the bobbin wiper first）
adjust

10. adjust the presser foot origin
press down
open the machine，press the bobbin wiper button ,the presser foot will find the origin automatically。loosen the screw and make the presser foot bar down，keep the presser foot and needle plate completely contact.then fasten the screw
screw

11. feed synchronous belt adjustment
we should make the belt have a proper tightness，too loosen will influence the feed，too tight will speed up the wear and tear，tension of general requirement of 70 ~ 80 N。when it need adjust，loosen the screw，and adjust a propre tighten
adjust the screw
press and check

12. synchronous belt adjustment
up axis and down axis synchronous cog belt，loosen or tighten is important for the machine working，
Its elastic consists of idler wheel to adjust, idler is fixed by screw, by the adjusting screw to adjust the synchronous belt tightness, adjust an appropriate amount。
adjust screw
synchronous belt
idler wheel
idler wheel screw

13. electronics clamp device adjustment
Open electronic thread clamp device shell can see internal structure, open electronic thread clamp device can be adjusted rod nut to adjust, open for 1 ~ 1.5 mm.。
adjust rod nut
adjust nut
1～1.5mm

14. Adjust thread break protection switch
when the machine running，thread break in the midway ，thread break protection switch willworking
generally in adjusting as long as pay attention to the disconnect switch， not in contact with the casing or thread clamp device, screw plastic gasket does not break, and metal.
screw plastic gasket

15. upper thread knife position adjustment
adjust screw
press button、start in B，now you can check the distance of the knife and needle plate holing is 4~6mm.
4~6mm

16. upper knife opening size adjustment
upper knife components have adjust screw，
this screw can adjust the knife opening size in step 3,when adjust to right，the knife opening size for big ，left for small
adjust screw
for big for small

17. Test mode In the setup mode under the level 2, press
Key can enter the test mode interface (pictured at right).
Each icon function specification as bellow:
serial number
name A
I01 upper knife B
I02 down knife C
I03 input check D
I04 LCD check E
I05 touch screen check F
I06 output check G
I07 speed setting H
I08 Continuous running

18. upper knife adjustment
test mode press
（I01upper knife） adjustment interface
seriesnumber
name
range
initial value A
origin position B
start position
-10~10 C
open position
-95~-80
-86 D
start cutting position
0~20 10 E
finish cuttingposition
30~50 40
choose the position you want to adjust， button choose（A、B、C、D），And then by pressing the switch to adjust the required value
F button back to origin

19. Make the needle down，simulation the upper knife working whether can clamp the needle ，if can not，you need adjust the upper knife。
clamp the needle
adjust screw
1～3mm
Move up the needle making trimming action once again to see its walking routes, in the final position, and the location of the cutter groove is 1 ~ 3 mm.Or adjust the above screws.

20. down knife position adjustment the knife notexceeding the needle
Origin inspection, to see the opening Angle of knife, knife can be folded, started sewing, knife can release the bottom line, the whole mechanism motion is flexible.The Allen screw loosening, rotating eccentric pin, the front end of the knife for the bottom line from the needle plate cutter gap 0-1 mm, adjustment, then tighten the Allen screw
the knife notexceeding the needle
groove
not exceeding the needle hole
down knife position adjustment
the knife opening size adjust screw

21. down knife adjustment test mode press
seriesnumber
name
range
initial value A
origin position B
start position
-10~10 C
open position
-35~-15
-22 D
start cutting position E
finish cutting position
40~60 50
test mode press
（I02 down knife） adjustment interface
choose the position you want to adjust， button choose（A、B、C、D），And then by pressing the switch to adjust the required value

22. the position of presser foot
In sewing mode, press or key, can test the machine needle and the clearance on both sides of the presser foot.If not appropriate, can loosen screw 1 and 2, adjusting the position of the parts 4 right. after make the parts 3 closely to parts 4, then tighten the screw 1.
adjust the position of the pin 5 light to the rightmost, tighten the screw 2.
After shutdown, pull the feed plate with the hand, confirm the conveying mechanism is flexible.Presser foot position before and after, by adjusting the feed sensor position to adjust

23. Enter the primary and secondary operation parameters
Press can switch data interface and input mode interface (pictured at right), under which can carry out some detailed Settings and edit operation.
Note: some key need to long press a key to open.

24. Enter the primary and secondary operation parameters
press Enter the primary（pictured at right）。
press out the operation parameters

25. Enter the primary and secondary operation parameters
setting mode leve 3，press secondary operation parameters（pictured at right）。
ress out the operation parameters

26. Restore the factory Settings
K200 parameter，Restore the factory Settings。（This option is password protected）