1. The distance between the paper stack and the paper separation nozzle is too large. The distance between the bottom surface and the paper stack surface when the paper separation nozzle is at the lowest position is about 6-8 mm for thin paper and 2 ~ 3 mm for thick paper. When the distance between the paper separation nozzle and the paper stacking surface is too large, if the vacuum degree of the air pump is not enough, it is easy to produce empty sheets.
Solution: during printing â‘ shorten the length of the paper pressure foot rod to reduce the distance between the paper separation nozzle and the paper stacking surface; â‘¡ adjust the eccentricity above the paper separation nozzle rod to reduce the height of the paper separation nozzle.
2. The paper trailing edge curls downwards. Because the paper trailing edge curls downward, the airflow blown by the loose paper blower cannot easily enter the paper gap and cannot be separated from the paper. At the same time, when the paper-separating nozzle comes down to suck the paper, the paper surface rolls down, and the air leakage phenomenon of the nozzle is easy to occur, and the paper cannot be sucked up.
Solution: during printing â‘ Adjust the adjusting screw on the separation cylinder, change the angle of the bottom surface of the separation nozzle to keep it parallel to the paper surface; â‘¡Move the paper down and knock on the paper.
3. The distance between the paper suction nozzle and the paper stacking surface is too large.
Solution: Adjust the height of the paper delivery nozzle during printing. When the paper delivery nozzle is at the lowest position, the distance between the bottom surface and the paper stacking surface: SZ201 type paper feed device is about 1.5mm; SZ206 type paper feed device is about 5mm. The height of the paper suction nozzle can be adjusted individually or as a whole. (As mentioned above)
4. The paper blocking brush is too low or too far into the paper stack. The application of the paper blocking brush should be closely coordinated with the loose paper blowing nozzle. When the air volume of the loose paper blowing nozzle is normal, it can blow the edge of the paper and raise it by about 5mm. This is also the distance that the paper blocking brush should leave the stack . When the paper separating nozzle comes down to suck the paper, it just touches the paper surface being blown up, or 1-2 mm higher than the paper surface. The paper blocking brush is pressed too low, so that the paper cannot be blown up, thereby increasing the distance between the paper separation nozzle and the paper surface, resulting in empty sheets; sometimes the paper blocking brush extends too much, although the paper separation nozzle can It sucks the paper but also bounces off the brush, causing empty sheets.
Solution: If the paper-blocking brush is moderately flexible during printing, adjust its height and the distance into the stack to the data described above.
5. Blockage of the gas path Most of the blockage of the gas path occurs in the suction system. The clogging comes from paper wool and dust, and most of them are blocked within a section of the suction nozzle pipe and the control piston. Because the piston has oil dirt, paper wool and dust are attracted by the oil dirt, and it accumulates more and more, and finally the suction air path is blocked, resulting in insufficient suction and empty.
Solution: Periodically clean the gas path and control piston during printing, and the machine printing rough paper should be cleaned once a week.
6. Insufficient suction. Due to the accumulation of ink on the suction nozzle and the rubber ring or the wear and tear of the rubber ring, air leakage during suction of the paper causes insufficient suction and can also cause empty sheets. The paper suction nozzle is particularly serious.
Solution: Strengthen the inspection and do the cleaning work during printing, especially if the previous color is on the ground, you should pay special attention to the next color.
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