Even the points of the sun-filling process

Poor suction causes network misalignment

When the vacuum of drafting is lower than 0.07MPa, relative displacement between the printing plate and the printing plate glass may also be caused 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 side emulsion cassette of the printing rack is a connecting member of the original frame and the carriage air path, as shown in FIG. 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 tracheal joint cracking

The vacuum tube joint is a kind of plastic part and it is easy to crack. This is the main reason for the vacuum failure, and it is also the part with the most failure in actual use (as shown in Figure 4). When severe, you can hear the sound of squeaking. The emergency measure is to use 502 glue to infuse the crack. But the best way is to replace it. It is recommended to purchase metal fittings that are more durable than plastic fittings.

3. X-axis or Y-axis screw axial misalignment causes misalignment

In addition to a rolling bearing, X-axis or Y-axis lead screw has a thrust bearing. It uses a round nut B to pull the screw tightly before leaving the factory so that it does not axially move, and then uses the stop pad A. It is locked. This dynamite can be measured with a dial indicator. As shown in Figure 5, the table seat is fixed on the bed and the top of the watch is on the wire.

At the top, artificial push-pull slides, the difference between the maximum and minimum values ​​of the dial indicator is the axial momentum 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. The opening nut has an axial gap to cause misalignment

When the ordinary wire 扛 is used as the X-axis and Y-axis transmission parts, 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.