1. Double or multiple sheets appear in the paper.
â‘ Cause: The paper blocking brush is too low or reaches too much into the stack, so that the paper cannot be blown loose enough.
Remedy: According to the operation and positioning requirements, adjust the brush to the correct position and make the paper blow loose.
â‘¡ Reason: The wind power of the paper suction nozzle is insufficient, and the height of the loose paper blowing nozzle is inappropriate.
Removal method: The suction force (volume) can be appropriately increased according to the nature and requirements of the paper; the loose paper blowing nozzle can blow about 6 sheets of paper on the surface of the stack according to the positioning requirements.
â‘¢Cause: The paper is thin and the suction volume is too large, so the paper below the first sheet is taken up.
Remedy: appropriately reduce the amount of air suction or change the rubber nozzle to a apron nozzle with a small suction force that is suitable for thin paper.
â‘£Cause: The paper is not blown loosely or there is adhesion on the edge of the paper.
Removal method: Adjust the air volume of the nozzle to the standard level to make the paper blow loose according to the paper quality; the height of the paper stack is appropriate to the normal working requirements, and the interval between them is not too long; normal work.
⑤ Reason: The front of the stack is too high.
Remedy: reduce the height of the front edge of the paper pile or use the method of adding wooden wedges to make the height of the lower part of the rear edge of the paper pile equal to the height of the front edge.
2. The paper is skewed or broken (ie missing).
â‘ Cause: The suction air of the paper separation nozzle and the paper delivery roller is insufficient, causing leakage.
Remedy: Increase the air volume of the paper separation nozzle and paper delivery roller according to the paper quality or replace the large-circle rubber suction nozzle with larger air volume.
â‘¡Cause: The suction nozzle of the separation nozzle and the delivery roller are not in good contact with the paper, and the suction surface of the suction nozzle is not parallel to the paper surface.
Remedy: Correctly adjust the smoothness of the surface of the paper and the coordination of the separation and delivery nozzles.
â‘¢Cause: The leather-like suction nozzle is stained with ink sticks or abraded air leakage; the suction nozzle or air path is blocked by paper dust or grease, causing the paper to be skewed and sometimes leaked during transportation.
Remedy: Always check and keep the rubber nozzle and the air path clean, and clean it at any time to ensure the smoothness of the air path; if the rubber nozzle is worn and leaks, it must be replaced in time.
â‘£Cause: The stack of paper is not flat, which makes it difficult to suck the paper and makes the paper skewed after being sent out.
Remedy: Load paper flat.
⑤ Reason: The air volume at the front of the paper stack is insufficient, which makes the paper difficult to advance or cannot be sent out, causing the paper to skew.
Remedy: Increase the air volume of the presser foot nozzle according to the paper quality and increase the front row nozzle.
â‘¥ Reasons: The pressure of the paper pressure roller is inconsistent, the belt is not tight enough, and some paper balls (or wheels) are skewed after entering the paper feed shaft due to the unequal pressure of the paper ball (or wheel).
Remedy: According to the paper quality, adjust its position correctly according to the operation positioning requirements.
3. The page numbers are uneven.
â‘ Reason: The pressure of the paper ball (or paper wheel) is inconsistent or improper.
Remedy: Adjust the pressure properly to make the pressure consistent.
â‘¡Cause: The punching knife is not sharp or the blade and knife ring are improperly installed.
Remedy: replace the blade of the punching knife, and adjust the distance between the blade and the knife ring at the correct distance.
â‘¢ Reason: The length of the positioning needle (ie the needle) on the folding knife is not appropriate.
Remedy: properly adjust the positioning needle to make it consistent in length.
â‘£Cause: The folding knife is not parallel to the folding roller, and there is a sound of friction with the folding roller.
Remedy: Adjust the blade of the folding knife to align with the gap between the two folding rollers, and ensure that it is parallel to the axis of the folding roller.
⑤Cause: The tension of the transmission line is inconsistent, and it may be damaged or broken.
Remedy: Adjust the tension of each conveyor belt to be consistent, and replace the damaged belt.
4. The length of the paper side of the signature is not too short or skewed.
â‘ Cause: The height of the folding knife is inconsistent, that is, it is not parallel to the folding roller.
Remedy: Adjust the folding knife to be parallel to the axis of the folding roller, so that the height of the two ends is the same when the sheet is pressed into the gap of the folding roller.
â‘¡ Reason: The two ends of the folding roller are not tight, that is, the distance between the pair of folding rollers is not equal.
Remedy: Cut the axis of a pair of folding rollers to make them parallel.
â‘¢ Reason: The regulation of a certain discount is not appropriate.
Remedy: Check the rules of each fold in turn and make adjustments.
â‘£ Reason: improper installation of punching knife.
Remedy: Adjust the punching knife so that the position of the cut is consistent with the crease.
⑤ Reason: The length of the positioning needle is inconsistent. The brush pressure or distance is inappropriate.
Remedy: properly adjust the positioning needle to make it consistent in length. Correctly adjust the brush position as required.
5. The pull gauge does not pull the paper in place or the paper is wrinkled.
â‘ Reason: improper pulling force.
Remedy: Set the pull force of the pull gauge with the pull gauge as the standard.
â‘¡ Reason: The height of the drawing board is not appropriate.
Removal method: According to the time of pulling the paper and the thickness of the paper, properly adjust the height of the cardboard.
â‘¢Reason: The paper feeding position is not proper.
Remedy: Check the paper in each link of the conveying process, and adjust it correctly according to the requirements to ensure that the paper is in place.
â‘£Cause: The page is curled or folded.
Remedy: Check carefully after hitting the paper, and level it when loading the paper.
6. Blocked or torn pages during sheet transport.
â‘ Reason: The paper is skewed.
Remedy: Check the paper in each link of the conveying process, and adjust it correctly according to the requirements to ensure that the paper is in place.
â‘¡Reason: The sheet has corners or tears, adhesion, etc.
Remedy: Check whether the paper has been loaded in the collision paper, and remove the damaged paper.
â‘¢ Reasons: the pressure bar and pressure roller are too low, and the sheet transmission is not smooth.
Remedy: Adjust the distance between the high-pressure rod and the pressure wheel appropriately.
â‘£Cause: The transmission line is broken or broken.
Remedy: replace the conveyor belt.
7. There is an error between the deviation of the punching knife and the crease.
â‘ Reason: The position of the folding knife and folding roller is not proper, skewed or not parallel.
Remedy: Adjust the blade of the folding knife to align with the gap between the two folding rollers, and ensure that it is parallel to the axis of the folding roller.
â‘¡Cause: It is skewed or obstructed during paper feeding.
Remedy: Check all links of the paper in the conveying process and adjust it correctly according to the requirements.
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