4. Unilateral outlets are empty
Cause: Roller pressure effect. The center distance between the two ends of the drum, or the pressure at both ends of the drum, should be kept equal, but some machine centres will walk away from the unilateral side, resulting in less unilateral pressure and causing the unilateral outlets to be less full.
Solution: Before checking the pressure regulator, you should first exclude the pattern, unilateral water, ink pressure and other unilateral factors.
First, press the lead wire to measure whether the roller pressure is consistent on both sides of the roller. If the pressure on both sides of the roller is more than 0.05 mm larger than the other side, it is confirmed that the pressure is reduced. Then remove the plate and blanket, then measure the naked roller and correct the center distance.
5. Blanket paper
(1) The delivery time of the drum pick-up and delivery buckling teeth is not correct. The paper grabs the paper from the swinging feed paper, reaches the cylinder gripper to complete the printing process, and passes it to the delivery cavities. There must be a certain transfer time between them to ensure the accuracy of the overlay and the continuity of the paper transfer, if the cylinder The short transfer time between paper teeth and delivery tusks will cause the paper to lose control in an instant and cause the paper to stick to the blanket. Paper viscous blankets caused by this cause occur frequently in the second group of the two-color printing press and the last group of the multi-color printing machine. In some cases, this may occur in each color group of the multi-color printing machine. .
(2) The pressure between the blanket cylinder and the impression cylinder is too large. In the printing process, excessive pressure will cause the paper to stick to the blanket. Even if the force of the roller gripper and the delivery gripper (or delivery cylinder teether) is increased, this phenomenon occurs from time to time, especially in the printing ink layer. Thicker, smoother coated paper is more common, because the friction caused by excessive pressure plus the surface adhesion is greater than the gripper's strength, this is caused by the paper adhesive blanket The paper's adhesion to the surface of the blanket is very firm and it can be difficult to remove it by hand.
Solution: Adjust the clenching time and adjust the printing pressure.
6. The roller cannot be pressed together
cause:
(1) The low clutch slips. The low-speed roller cannot be pressed together. The common is the clutch (mechanical) crescent bump sliding.
Solution: (mechanical) remove the clutch, cut several diamond-shaped grids on the flat surface of the crescent, or do repairs at the bumps.
(2) The drum is loose from the pressure backing screw. One of the reasons that high-speed machines are not able to press up is that the "back-up" screws from the pressure are loose. The "back-up" screws are mounted on the transmission wall plate. After loosening, the roller will be over-extracted from the pressure. At this time, the clutch on the operating surface will be forced back. When the pressure is again applied, the electromagnet will push up the active supporting teeth, and the active supporting teeth cannot slip with the passive prop teeth, causing the rollers to fail to press together. If this phenomenon is not discovered early, the electromagnet coil will soon be burned. Sometimes the operator judges an error and assumes that the electromagnet has failed. As a result, the replaced electromagnet coil burns and causes losses.
Solution: When the rollers do not press together, remove the protective cover and instigate the machine to check if the electromagnet is working. Replace it if it has been burned out. At the same time check whether the roller clutch pressure is too heavy, excessive pressure, the active support teeth can not be engaged with the passive support teeth, then you need to open the transmission mask shell, the drum from the pressure "backing" screw screw the direction of an instant. When screwing, it can be screwed 1 or 2 more times, so that the active pincers can enter into the position of the supporting pin of the passive pinion with a 0.1 mm allowance, and the “backing†screw can be locked firmly.
7. Coupling axis buffer
In the printing process, the separating and pressing movements of the eccentric shaft sleeve and the separating and pressing working elements are operated by the roller separating and pressing mechanism. However, due to mechanical wear and improper adjustment, the clutch shaft's buffer action will occur after the drum is pressed. Its origin is mainly in the roller clutch mechanism, this phenomenon occurs after adjusting the pressure or changing the liner. It is characterized by the first lap after compression, the clutch shaft, the swing bar and the connecting rod are not in line, and it is only a few weeks after operation.
Solution: First of all, according to the machine manual carefully adjust and measure the roll gap, in strict accordance with the data liner, to avoid any increase in pressure caused by the pressure of the clutch shaft when the buffer phenomenon.
(2) Wear of pawl or stay teeth makes the clutch mechanism lose its self-locking ability. When the pawl or stay teeth are worn, the combined pressure is not enough, so that the clutch shaft, swing bar, and connecting rod are not in alignment and lose self-locking ability. Buffering phenomenon.
Solution: After the pressure is applied, the center of the clutch shaft will be pulled through the axis of the rocker to the center of the connecting rod. When observing a three-point line, when there is a gap between the pressure and the “backingâ€, you can try to add a plug between the detent and the supporting teeth. When the three-point line is reached, or slightly more than good, it is better. The wear data was measured and then resolved by welding pawls or braces.
(3) Loss of control of the wear of the clutch sleeve As the shaft diameter of the roller and the wear of the sleeve cause shake, the “membrane†phenomenon occurs, and the clutch mechanism loses the control of the required accuracy, resulting in the clutch shaft buffering action.
Solution: Install or replace in time for remedy.
8. The problem that should be paid attention to when adjusting the center distance of the roller
In the adjustment process must pay attention to:
(1) The pad of the plate cylinder and the blanket cylinder (including printing plate, rubber, woolen cloth, and lining, etc.) must be removed, and at the same time, the roller gap, the roller gap, and the gear gap should be measured under pressure.
(2) A cylinder (plate cylinder or impression cylinder) without eccentric bearings must be selected as the reference. This cylinder must be installed with a horizontal alignment and perpendicular to the wall.
(3) When turning the rubber roller eccentric bearing to the embossing position, it must be noted that the position of the eccentric bearing at both ends should be in the same direction. In this way, the center misalignment of the axis of the blanket cylinder with respect to the axis of the reference cylinder can be avoided.
(4) For offset-free offset presses, the gear meshing clearance must be adjusted within the specified range. Beware of the "tooth" of the tooth root. For the offset printing machine that measures the roll, adjust the gap between the two ends to the standard value and roll at the same time. The pillow must be clean and round. Then select the two ends and the middle three points on the surface of the roller to check whether the roller gap is the same and ensure the parallelism of the roller.
appendix:
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