Heidelberg GTO offset press failure and exclusion (3)

Failure 9. Causes of rupture of stamping roller rakes and transfer roller dents:
1. The tooth plate is not uniform when it is leveled;
2. External force collision.
Troubleshooting method:
1. Replace new parts;
2. Mapping and processing. Pay attention to the quality of heat treatment to make it wear-resistant and good toughness.
Fault ten. Print product bite mouth tear, break, bite small and other reasons:
1. The same row of biting paper teeth is not flush (such as the swinging transfer device, impression cylinder, transfer roller, and delivery line), which makes the paper wrinkle and tear off at the time of pair transfer and the same row of bite paper. .
2. Improper transfer time between the swinging transfer tooth and the impression cylinder, due to the cam wear caused by the feed shaft oscillation control, leading to the advance or lag in the transfer, and not achieving the "zero speed" transfer, and the paper being crushed or wrinkled. ;
3. The swinging sheet feeder opens the teeth and the cam plate face is seriously worn. As a result, the amount of open teeth changes when the sheet is released, and the delivery time is also shortened. This makes it easy to tear paper, crumpled paper and have a small mouthpiece.
4. The step shaft (69.013.045shouldered screw) is screwed into the wall plate at one end, and the other end provides support for the bumps. After a period of use, fatigue wear occurs. When the wear is severe, or when the needle roller bearing fails, Change the position of the working face of the cam plate and shorten the time for the transfer of paper;
5. Under normal conditions, by fine-tuning the eccentric shaft (drawing number 69.013.047 Ellentric shaft). Changing the length of the connecting rod can compensate for the cause of the displacement of the cam face, corrective action, but because the eccentricity is only 2mm, so the compensation is very small.
If the eccentric shaft wears badly, or if the needle roller shaft fails, the cam surface will also be displaced, resulting in rotten paper;
6. When the locking bolt (figure number 52.022.133 latch) looses or the fixed cam opener wears badly, it will cause the relative position of the swing gripper gripper and the feeding plate to change, resulting in the opening of the receiving paper. When you bite the paper, you can't catch the paper.
7. Uniform-printed transfer tube III open tooth roller bearing damage, or open tooth cam wear, or fixed bolt loose, or closed pressure spring failure, etc., will cause the transfer of paper with the two-color impression cylinder tooth decay paper Wrinkled paper
8. Thin paper; serious static electricity, improper temperature and humidity, etc.
Troubleshooting method
1. Check and adjust the rows of grippers and tensions respectively;
2. Open the drive side machine cover, loosen the lock nut, use the wrench first slowly rotate the fine adjustment eccentric (Figure 42.013.014 Ellentricstud) a little, shake the machine, while watching the swinging transfer paper and the impression roller The paper transfer situation (should be relatively zero speed transfer, and there is a small piece of paper together to clamp the same speed forward time),
Adjust to no longer tear paper. If the paper is wrinkled or the size of the mouthpiece is not suitable during the adjustment process, the eccentric may be rotated counterclockwise by a small angle and repeated several times until it is eliminated or partially eliminated, and the eccentricity can be adjusted. best effect". Then according to the situation, adjust and repair according to the following methods 8 and 5 until all the faults are eliminated. Actually, this is a multi-factor optimization problem. What we use is the direct judgment and exploration optimization method. At present, most of the printing industry in China adopts this method for maintenance. . Because there are many related variables in the printing process,
It is not stable, the objective function is not easy to determine, and it is difficult to establish a complete mathematical model. It is difficult to select the optimal adjustment amount by numerical optimization method for analysis and calculation. Therefore, it is necessary to make logical judgments based on accumulated experience skills and intuition. This method is effective, but it requires higher technical quality of maintenance personnel;
3. Brushed or welded repair worn cam face, drawing number 69.013.044 Lerercam;
4. Replace the small shaft and damaged needle bearing (drawing No. 69.013.045shoulderedscrew), or surveying and processing,
Material selection 40cr steel, heat treatment hardness HRC45 ~ 50; bearing can process copper sleeve substitute;
5. Replace the eccentric shaft (69.013.047Ellentricshaft) and needle roller bearing, or mapping processing copper sleeve (nylon) instead of bearing, use 40Cr steel machining eccentric shaft, heat treatment HRC45-50;
6. Brush plating or repair welding repair cam and locking bolts 52.022.133latch;
7. Replace bearings, choose domestic bearings 1007 # or 27 # instead.
Note that when using the Type 27 emergency, sometimes the two bearings can be used in parallel to increase the strength, just to make a small extension shaft; or replace the compression spring, the rest with the same method;
8. Replace or re-air paper.
Failure eleven. Imprinting is not allowed:
1. The misalignment of the side rule can lead to misalignment of left and right overprints.
2. The former rules are uneven or the positioning is unstable, which can lead to misalignment before and after overprinting;
3. The random vibration of Case 6 above can make overprint inaccurate and irregular;
4. The vibrations caused by the causes 4 and 5 in the above example make the delivery paper unstably loose, misaligned, misaligned, and irregular;
5. The random vibration caused by the above reason 7 causes misalignment of the two-color overprint.
Troubleshooting method:
1. Carefully adjust the side rules so that the paper is pulled in place and aligned;
2.
A. Pre-regulatory fine-tuning;
B. By adjusting the length of the pull rod (42.022.130Rod) to control the amplitude of the front sway and drop;
C. Through the limit block adjustment screw (42.022.111) to make the former specified bit accurate;
Note: The above troubleshooting method also has reference significance for the Heidelberg M-series offset press. Because the M series machine is a modified design with the advantages of the GTO series and the Specdmaster series offset press, it has many similar or identical structures with the first two series of offset presses, and the parts also have more versatility, which gives maintenance work Bring convenience.