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newspaper Printing has a high requirement for aging. Generally speaking, the newspaper printing machines used for printing in prefecture-level newspapers are mostly small machines with a printing speed of 45,000 hours or medium-sized machines with a capacity of 70,000 hours. At such a high printing speed, if the folding machine is not adjusted, various problems such as paper jam, skew, wrinkles, and page breaks may occur during the production process. If these problems cannot be solved in a timely and effective manner, they will directly affect the reporting time. Paper jam is one of the most common faults of the folding machine. Here, the author will use the French Gauss Universal 45 machine (the matching folding machine is 1:3:3 type) as an example to elaborate the paper jam. The cause of the fault and the solution are for your reference.
The three-roller folding machine of the newspaper printing machine usually has 1:3:3 type, 2:3:3 type, 1:2:2 type. The structure and principle of these folding machines are similar, and the folding process is roughly as follows: paper After passing through the vertical folding of the triangular plate, the guide roller and the paper-carrying roller are used to pick up the needle on the folding roller, and the horizontal folding is performed by the knives and the knives, and the knives are cut at the same time. Into a single sheet of paper. After the cross-folding is completed, the paper is delivered to the impeller by the knives and then transferred to the exit conveyor.
Paper jam failure
Phenomenon: Before the multi-paper paper tape enters the folding machine, the paper will drift and cannot guarantee good vertical folding precision. In severe cases, the size of the paper when it is folded into the folding machine even exceeds the cuttable size of the folding machine, resulting in continuous cutting of the newspaper, causing paper jam.
This phenomenon is mainly caused by the unbalanced pressure between the left and right or the upper and lower pair of paper rollers.
Solution: Adjust the paper roll pressure. When adjusting, the pressure of the lower pair of paper rollers is slightly higher than the pressure of the upper pair of paper rollers.
Paper jam fault two
Phenomenon: There is a folding angle in the cutting position of some finished newspapers. When the situation is serious, the newspapers are cut continuously and the folding fails. After the paper is jammed, the scraps taken from the impeller are basically connected together.
This is mainly caused by the aging of the cutting knife or the unevenness of the left and right, or it may be caused by the aging of the plastic strip on the sheet roller.
Solution: Pay attention to the change of newspaper incision, and always maintain the cutting knife. When replacing the cutting knife, be patient and adjust the height and position.
Paper jam fault three
Phenomenon: Newspapers jammed at the impeller are damaged, and there is usually a case where a newspaper is broken to only half of it, and the break is not neat.
This is because when the newspaper of the sheeting roller is folded across the sheet and conveyed to the folding cylinder, the instantaneous position of the newspaper is unstable, causing the horizontal folding to fail, thereby causing the paper to be jammed at the impeller.
Solution: Adjust the rectangular flat brush under the sheet roller. When the brush is excessively worn and the newspaper that is out of the mouth is skewed to one side, it is necessary to replace the brush in time.
Paper jam fault four
Phenomenon: The newspapers that were placed at the impeller did not break, and the newspapers remained basically intact and not connected.
This situation is generally caused by the fact that the knives are worn and cannot hold the newspaper, so that when the newspaper enters the impeller, it is in a free state in advance and cannot fall accurately into the impeller. In addition, failure of the outer knives torsion bar failure, cam follower bearing wear, etc. may also cause the report to fail, and the paper is jammed at the impeller.
Solution: Replace the knives. There is a harbinger for the failure of the knives. For example, the newspapers are skewed around the newspaper, especially the newspapers on the single paper will be uneven, and wrinkled in the opposite direction of the newspaper falling into the impeller. When replacing the knives, pay attention to the knives to be flush with the surface of the folding cylinder. If it is too high, it will hit the knives during folding, which will cause the finished product to break at the cross-fold. The contact area of ​​the tool holder is reduced, and it is prone to failures such as page defects.
The occurrence of the paper jam of the folding machine is caused by many reasons. The operator should pay attention to the observation, study the relevant knowledge, do more hands-on, diligent thinking, communicate with each other when discovering the problem, discuss each other, and accurately determine the fault point. Solve the problem in time and guarantee production.
The above content is reproduced in the " Printing Technology " official WeChat (Printech1957), authorized by the company to publish, copyright, piracy will be investigated!
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