Paper drop refers to the phenomenon that the paper falls under the machine during the process of entering the drum to the take-up table. The failure of the paper drop will cause many waste products and delay production.
(1) The paper is uneven and wavy.
The paper is not uniform, making it difficult to feed. Especially for whiteboard paper, it is very easy to cause the front gauge paper to be out of place, so that the paper gripper is too little, and even the paper cannot be gripped, causing the paper receiving row and the delivery row to fail to hand over normally and drop the paper.
(2) The paper corner is up.
When the paper comes to the previous position, the corner of the paper is curled up at the mouth of the paper, and the height of the tooth is lower than the height of the corner of the paper when the paper is gripped, so that the tooth can not be gripped completely, even in the teeth. At the moment of closing, the paper is ejected back due to touching the corner of the paper, causing too few grippers to drop the paper.
(3) Double sheets appear in the paper.
When there is a double-sheet failure in the paper feed, two overlapping papers will appear to be slightly faster and slightly slower. When entering the front gauge, the slow one may not be able to be gripped completely by the gripper and fall under the machine.
(4) Paper feeding is abnormal.
Due to improper adjustment of the machine, the paper is skewed, too fast or too slow, causing the transfer paper to grip the paper and the paper is unstable.
(5) The pre-positioning distance is incorrect.
After the paper reaches the pre-specified position, the gripper grips the paper 4 to 6 mm, too much will tear the paper easily, and too little will cause the paper to fall due to insufficient gripping.
(6) The contact time between the paper pick row and the big teeth of the impression cylinder is wrong.
If the pick-up teeth are arranged too early, the paper will be broken; if it is too late, the paper will be dropped because it cannot hold the paper.
(7) The gripping force of the paper picking row is not enough.
When the paper picking row picks up half of the paper, or only half of the individual row picks up the paper, it means that the gripping force of the row is too light, and the gripping force should be adjusted again.
(8) The positioning and paper feed connection time is incorrect.
When the paper arrives at the front gauge, due to the inconsistency between the speed of the wheel paper and the connection time of the connecting gauge, the positioning of the paper is disordered, the paper is not well received and the paper is dropped.
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