The poor reproducibility of outlets means that errors occur at the same position in the reworked outlets and the original outlets, that is, repetitive errors. Repetitive error conferences cause misprints, resulting in chromatic aberrations and poor picture quality. The causes of repetitive errors in the network are as follows:
1. Improper attachment of the photosensitive sheet to the printing table causes dot misalignment. We know that even the process of drying is bringing the photosensitive sheet to the glass of the original document frame to be in close contact with the original document sheet. After the exposure is completed, the vacuum is released and the photosensitive sheet is blown down. A sun. As shown in FIG. 1 , each time the sensitization film is moved up and down twice, if the sensitized film and the sensitized board are not stuck firmly, the sensitized film cannot be completely returned to the original position after exposure, and displacement of the sensitized film causes dot misalignment. Many users only stick four corners (as shown in Figure 2a) in order to save time when fixing the photosensitive sheet. This is not enough for the drying of the web. In order to prevent the relative displacement of the photosensitive sheet and the photoreceptor, the user is advised to tape the photoperiod around the photoreceptor sheet (as shown in Figure 2b).
2. Poor exhausting causes dot misplacement When the vacuum of the draft is lower than 0.07 MPa, relative displacement may also occur between the printing plate and the printing plate during the printing process. In northern regions in particular, due to air drying, electrostatic adsorption is likely to occur in winter, and the phenomenon that the original is absorbed by the photosensitive sheet occurs. The causes of vacuum failure are the following:
1 The air filter on the vacuum pump is not clean, causing a bad vacuum. It is recommended that the user remove the air filter cartridge every six months to one year and use the brush to clean the dust between the gaps. If there is a damaged place to be replaced immediately, it will cause the graphite scraper in the vacuum pump to break.
2 Latex nozzle aging The rear frame side emulsion case is the connection between the original frame and the carriage air path, as shown in Figure 3. Its sealing performance directly affects the degree of suction vacuum. Due to the aging of latex, the use of a long time will appear broken at the edge of the phenomenon, in this case must be replaced.
7 Vacuum pipe joint cracking Vacuum pipe joint is a kind of plastic piece, which is easy to crack. This is the main reason for the vacuum failure, and it is also the most troubled part in practical use (as shown in Figure 4). Severe hearing can be heard when the sound, emergency measures is to use 502 plastic perfusion cracks. But the best way is to replace it. It is recommended to purchase metal fittings that are more durable than plastic fittings.
3. The axial displacement of the X-axis or Y-axis screw causes the misalignment of the X-axis or Y-axis screw. In addition to a rolling bearing, there is a thrust bearing and the factory tightens the screw with a round nut B to make it tight. There is no axial turbulence and then it is locked with a stop washer A. This dynamite can be measured with a dial indicator. As shown in Fig. 5, the table seat is fixed on the bed, the top of the watch is on the top of the wire and the slide is manually pushed. The difference between the maximum value and the minimum value of the dial indicator is the axial movement of the screw. If this value is greater than 0.01mm, the locking plate of the stopper gasket A is picked up from the notch of the round nut B, and then the nut B is tightened, and then measured until its amount of turbulence is less than 0.01mm.
4. Axial clearance of the opening nut causes misalignment of the screen. When the ordinary wire sprocket is used as the transmission element of the X-axis and the Y-axis, the gap between the screw and the nut will cause a large splicing error. In order to solve this problem, the structure of the open nut shown in FIG. 6 was used.
Two nuts B are mounted in the housing A. The two nuts are used to support the two nuts. The pressure between the two nuts can be adjusted with the screw F. The right nut and the right screw surface of the screw are closely attached. The left nut and the The left helix of the screw sticks tightly. There is a gap between the nut and the screw, but there is no gap with the screw as a whole. This solves the contradiction presented above, which can ensure the rotation of the screw and avoid the gap error of the ordinary screw. However, if the opening nut is dirty, or the spring force of the strong spring is reduced, or the transmission load increases, an error will still occur. The error is measured by sucking the dial indicator on the bed and hitting the meter head on the carriage (see Figure 7). Push and pull the carriage by hand. The difference between the read maximum and minimum values ​​is the opening The amount of nut rotation. To control it within 0.01mm, if it is greater than this value, open the end cap E of the open nut first to clean it, and screw the adjustment screw F clockwise to increase the pressure of the open nut and screw helicoid to reduce The purpose of momentum.
In recent years, the drive of the continuous dryer has been changed to a ball screw. The ball screw is a transmission that does not have a gap, so there is no such problem.
Repeatability is not good in the dryer even more than the above mentioned four reasons. When you don't know what the reason is, you can debug it one by one and you can eliminate this type of failure.
1. Improper attachment of the photosensitive sheet to the printing table causes dot misalignment. We know that even the process of drying is bringing the photosensitive sheet to the glass of the original document frame to be in close contact with the original document sheet. After the exposure is completed, the vacuum is released and the photosensitive sheet is blown down. A sun. As shown in FIG. 1 , each time the sensitization film is moved up and down twice, if the sensitized film and the sensitized board are not stuck firmly, the sensitized film cannot be completely returned to the original position after exposure, and displacement of the sensitized film causes dot misalignment. Many users only stick four corners (as shown in Figure 2a) in order to save time when fixing the photosensitive sheet. This is not enough for the drying of the web. In order to prevent the relative displacement of the photosensitive sheet and the photoreceptor, the user is advised to tape the photoperiod around the photoreceptor sheet (as shown in Figure 2b).
2. Poor exhausting causes dot misplacement When the vacuum of the draft is lower than 0.07 MPa, relative displacement may also occur between the printing plate and the printing plate during the printing process. In northern regions in particular, due to air drying, electrostatic adsorption is likely to occur in winter, and the phenomenon that the original is absorbed by the photosensitive sheet occurs. The causes of vacuum failure are the following:
1 The air filter on the vacuum pump is not clean, causing a bad vacuum. It is recommended that the user remove the air filter cartridge every six months to one year and use the brush to clean the dust between the gaps. If there is a damaged place to be replaced immediately, it will cause the graphite scraper in the vacuum pump to break.
2 Latex nozzle aging The rear frame side emulsion case is the connection between the original frame and the carriage air path, as shown in Figure 3. Its sealing performance directly affects the degree of suction vacuum. Due to the aging of latex, the use of a long time will appear broken at the edge of the phenomenon, in this case must be replaced.
7 Vacuum pipe joint cracking Vacuum pipe joint is a kind of plastic piece, which is easy to crack. This is the main reason for the vacuum failure, and it is also the most troubled part in practical use (as shown in Figure 4). Severe hearing can be heard when the sound, emergency measures is to use 502 plastic perfusion cracks. But the best way is to replace it. It is recommended to purchase metal fittings that are more durable than plastic fittings.
3. The axial displacement of the X-axis or Y-axis screw causes the misalignment of the X-axis or Y-axis screw. In addition to a rolling bearing, there is a thrust bearing and the factory tightens the screw with a round nut B to make it tight. There is no axial turbulence and then it is locked with a stop washer A. This dynamite can be measured with a dial indicator. As shown in Fig. 5, the table seat is fixed on the bed, the top of the watch is on the top of the wire and the slide is manually pushed. The difference between the maximum value and the minimum value of the dial indicator is the axial movement of the screw. If this value is greater than 0.01mm, the locking plate of the stopper gasket A is picked up from the notch of the round nut B, and then the nut B is tightened, and then measured until its amount of turbulence is less than 0.01mm.
4. Axial clearance of the opening nut causes misalignment of the screen. When the ordinary wire sprocket is used as the transmission element of the X-axis and the Y-axis, the gap between the screw and the nut will cause a large splicing error. In order to solve this problem, the structure of the open nut shown in FIG. 6 was used.
Two nuts B are mounted in the housing A. The two nuts are used to support the two nuts. The pressure between the two nuts can be adjusted with the screw F. The right nut and the right screw surface of the screw are closely attached. The left nut and the The left helix of the screw sticks tightly. There is a gap between the nut and the screw, but there is no gap with the screw as a whole. This solves the contradiction presented above, which can ensure the rotation of the screw and avoid the gap error of the ordinary screw. However, if the opening nut is dirty, or the spring force of the strong spring is reduced, or the transmission load increases, an error will still occur. The error is measured by sucking the dial indicator on the bed and hitting the meter head on the carriage (see Figure 7). Push and pull the carriage by hand. The difference between the read maximum and minimum values ​​is the opening The amount of nut rotation. To control it within 0.01mm, if it is greater than this value, open the end cap E of the open nut first to clean it, and screw the adjustment screw F clockwise to increase the pressure of the open nut and screw helicoid to reduce The purpose of momentum.
In recent years, the drive of the continuous dryer has been changed to a ball screw. The ball screw is a transmission that does not have a gap, so there is no such problem.
Repeatability is not good in the dryer even more than the above mentioned four reasons. When you don't know what the reason is, you can debug it one by one and you can eliminate this type of failure.
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