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Summary of Contents for ZOJE ZJ781-BD
- Page 1 Service Manual Buttonhole machine ZOJE ZJ781-BD...
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Page 3: Table Of Contents
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. -
Page 4: The Height Of The Needle Bar
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. -
Page 5: Matching Of The Baseline Adjustment Handle
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. -
Page 6: The Needle Bar Cooperation
Adjust the left and right baselines so that the cutter falls in the center of the parallel portion. 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:... -
Page 7: The Adjustment Of The Needle Drop
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. -
Page 8: The Height Of The Needle Bar Swing Fork
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. -
Page 9: Front And Rear Position Of The Presser Foot
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. -
Page 10: Cutter Falling Time
Confirmation after adjustment: Please confirm that lifting arm 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. -
Page 11: Knife Of Action Hook Position
11. Knife of action hook position Adjustment requirements: The clearance between the cutter drive lever and the knife of action hook at the lowest point is 0.05~0.2mm. Adjustment method: Use the knife of the drive hook adjustment screw to adjust. The phenomenon when the adjustment value changes: (1) When the cutter does not return or continuously falls, check the gap between the cutter drive lever and the cutter action hook, or change the cutter drive lever tension spring. -
Page 12: Start The Position Of The Security Hook
Adjustment method: Move the stop block A up and down to adjust. Adjustment of the stop buffer rod spring: When the hex nut is adjusted to the stop buffer rod to expose 5mm, tighten it. Adjusted confirmation method: The stop frame is adjusted to a high speed running state, and the manual stop handle is rotated, the stop block must release a first gear, enter a low speed state, and then release the second gear to enter a stop state. -
Page 13: Left And Right Position Of The Upper Knife
Adjustment method: (1) Loosen the roller shaft fixing screw in front of the presser foot connecting rod, adjust the amount of back and forth movement of the upper knife, move to the right to increase the amount of movement, and shift to the left to decrease. (2) Note: The adjustment of this part is a slight adjustment, please do not adjust excessively The phenomenon when the adjustment value changes: When the amount of front and rear movement is excessively adjusted, the protruding portion of... - Page 14 Adjustment method: (1) Step on the presser foot pedal. When the upper thread scissors move to the apex, use a hex wrench to loosen the fixing screws of the scissors pendulum and adjust the position of the front, back, left and right. (2) Loosen the fixing screw of the upper scissors action plate A and adjust the amount of overlap between the upper knife and the lower knife.
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Page 15: Height Of The Upper Scissors
16. Height of the upper scissors Adjustment requirements: Install the scissors as low as possible, but do not touch the presser foot. Adjustment method: Loosen the fixing screws of the upper scissors and adjust them up and down. Confirmation method after adjustment: Place a gasket with a thickness of about 4 mm under the presser foot. When moving the presser foot lever up and down, the presser foot and the scissors should not touch each other. -
Page 16: The Time When The Scissors Are Opened
At the beginning of the sewing, the top end of the upper scissors leaves the center of the needle cutter slot 0 to 1 mm to the left. Adjustment method: This position is adjusted by increasing or decreasing the number of wire head control pad spacers. Note: There is also a relationship with the position where the upper scissors clamps the wire, so confirm the position of the upper scissors action plate, and then increase or decrease the wire control plate gasket. -
Page 17: Adjustment Of The Limit Plate
19. Adjustment of the limit plate Adjustment method: Loosen the limit plate fixing screw that the sewing machine is in a state of low speed start (when the stop block A and the stop lever block B meet) the safety lever is in light contact with the limit plate. Adjusted confirmation method: When the safety lever is pressed toward the mark in the high-speed start state, there should be no gap in the long hole at the safety pusher shaft screw. -
Page 18: Upper Scissors Spring Pressure
The phenomenon when the adjustment value changes If it does not engage, the opening action of the scissors is not good. 21. Upper scissors spring pressure Adjustment method: (1) When the upper thread scissors are loose, move the front of the scissors spring with the hand plate.The front of the upper scissors spring and the scissors mouth are all attached, and the thread can be clamped regardless of where the scissors cut the thread. -
Page 19: Height Of The Presser Plate
23. Height of the presser plate Adjustment requirements: The lifting amount of the presser foot is 12mm Adjustment method: Insert the 12mm pad between the presser foot and the needle plate, loosen the presser foot fixing screw, press the presser foot lifting pedal, and press the presser foot clamp and the presser foot roller frame, then tighten the presser foot fixing screw . -
Page 20: Starting Lever And Starting Ram Position
under 93 stitches 10~12mm between 93-123 More than 123 stitches The phenomenon when the adjustment value changes: Moving the low-speed bumps counterclockwise can reduce the number of stitches from low speed to stop. 25. Starting lever and starting ram position Adjustment method: When the machine is stopped, the gap between the end of the adjusting screw on the starting ram and the stop frame is 0.5~1mm;... - Page 21 Same as the adjustment method of the head start fork. When the low speed is running, loosen the fixing screw of the speed reduction mechanism fork and adjust the position of the speed reduction mechanism fork. However, adjust the limit screw at high speed. The standard movement of the fork is 14mm.
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Page 22: The Adjustment Of Other Parts
The adjustment of other parts 1. Adjust the position of the left and right stitches according to the width of the hole: (1) Swing of the needle: based on the right side,Sew the needle to the left side for sewing.In the figure, A is the left baseline, B is the right baseline, W1 is the left and right horizontal amplitude width, W2 is the reinforcement amplitude width, C is the first reinforcement length (first set), and D is the second reinforcement length (second set) ). -
Page 23: Adjustment Of The Wiper
The second tensioner is opened in the reinforcement part of the serrated seam and a few needles after the sewing is completed, and the opening amount is 0.5~1 mm. When adjusting, loosen the set screw and adjust the position of the gripper to adjust. The first loose wire bump and the second loose wire bump on the main cam are rotated in the direction of the arrow to speed up. -
Page 24: Lower Thread Tension Spring
(Action sequence): Upper thread scissors action Lower thread lever action Lower line moving knife action <Upline scissors action>------ Cut section thread <Lower thread lever action>------Pull out the lower thread required for the initial seam and pull in the remaining upper thread <...
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I want the threading settings page.