1. Improper adjustment of the distance between the paper stack and the separation paper suction purple will cause a malfunction. If the distance is too large, empty sheets will be generated. The distance between the paper suction nozzle and the paper stack is the paper suction distance. It should be generally between 2-7cm. When printing thick paper, it can be smaller. When printing thin paper, it is necessary to prevent double sheets or double sheets or When multiple sheets are generated, the distance can be adjusted slightly larger. The former is about 2-4cm, the latter is about 5-7cm. The general treatment method is to loosen the screw that controls the height of the blower presser foot and adjust the blower presser foot upward. The reduced distance is the ideal distance between the paper stack and the separation nozzle.
2. The paper blocking brush is too low or too far into the distance. The role of the paper blocking brush is to assist the loose paper blowing nozzle, so that the blown paper maintains a certain height and no longer fits with the paper below, which is conducive to the smooth conveyance of the paper conveying system. The mouth is closely coordinated. 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 the distance that the paper blocking brush should be away from the stack of paper. It happens to touch the paper surface blown by the wind. If the paper blocking brush is pressed too low, the paper cannot be blown nor lifted, which is equivalent to increasing the distance between the paper separation nozzle and the paper surface, which is more likely to cause empty Zhang. Sometimes the paper-blocking brush extends too much, although the paper-separating nozzle can suck the paper, it will be bounced off by the brush and cause empty sheets. The solution is to readjust the brush, adjust it to about 5mm from the stacking surface, and adjust the distance to reach about 8mm.
3. The paper is slightly curled downward. There are two reasons for the empty sheet phenomenon in this situation. The first reason is that the airflow from the loose paper blower does not easily enter the paper gap, and the paper cannot be separated when the airflow reaches the edge of the paper. When the paper surface is uneven, air leakage occurs, which makes the paper unable to blow up and cause empty sheets. The usual processing method is to move the paper down for positive knocking.
4. Insufficient suction. Sometimes the ink on the suction nozzle and the rubber ring has accumulated for a long time without being cleaned, or the rubber ring is worn and broken, and air leakage or insufficient suction force when suctioning paper can also cause empty sheets. The processing method is to strengthen the inspection and maintenance work, especially when the previous color is full version on the ground, special attention should be paid when printing the next color.
5. The gas path is blocked. The majority of this situation is due to blockages (both from paper and dust) in the suction system, and most of them are blocked in the suction nozzle pipe and control piston section. When there are oil stains in the piston, paper wool and dust are attracted to the place, most of them are stuck by the oil stains, and the more they accumulate, the more they block up. Finally, the suction air path is blocked, resulting in insufficient suction and voids. In this case, it is necessary to regularly clean the rougher paper such as the gas path and the piston, printing cardboard, and insist on cleaning once a week. The oil in the piston should be replaced with train oil and engine oil mixed 1: 1.
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