Modern offset presses, whether they are low-speed machines or high-speed machines, use the paper-feeding system and use overlapping paper feeders. Therefore, during the printing operation, due to improper adjustment of the paper feeding system, or due to various reasons such as materials, processes, and techniques, the paper may cause multiple sheets of paper and sometimes even tens of sheets of paper to cause a sudden stoppage. The phenomenon is often referred to as "stingy car." The main reasons are as follows:
1. Improper adjustment of the paper feeding system: the paper stack is higher than the front paper stopper, and multiple sheets of paper enter the drum.
2. Bulk paper blowing nozzle has a small air volume. Several sheets of paper in front of the paper stack are completely blown away. Under the action of the paper feeding nozzle, multiple sheets of paper are fed into the drum through the paper feeding board.
3. Thickness of the ink in the printed matter caused the paper to stick, and the paper was not completely loosely opened before being fed into the drum.
4. The double sheet controller misadjusts or malfunctions. When multiple sheets of paper are fed in, if multiple sheets of paper cannot be effectively sent and the paper feed is interrupted, multiple sheets of paper will enter the drum.
5. Before the regulation of electrical tooth failure, when the paper machine is not properly adjusted, there will be paper skew so that the overlay overlaps on the blanket, when the overlap reaches a certain thickness, there will be "boring car" failure.
6. Parts of the paper feeding components fall off, or there are other sundries in the regular parts that enter the drum to cause the mechanical overload operation and “sudden car†malfunction. Under normal circumstances, the two-color machine causes a "stingy car" fault. This has the characteristic that when the number of paper entering the roller is large, the "stingy car" often occurs between the first group of blanket rollers and the impression cylinder, and if the number of sheets enters the roller Less, due to various reasons such as the mechanical speed inertia force, it is possible that one or two sets of blanket cylinders are under pressure at the same time.
To sum up, the occurrence of “stingy cars†is mainly due to the fact that the machinery is suddenly subjected to a large external force during the operation process. This overloads the machinery. If it is not handled and eliminated in time, it will cause different degrees of damage to the machinery. Therefore, after the "stingy car" occurs, the pressure should be removed as soon as possible, and the paper under static pressure is withdrawn from the drum. In order to reduce the deformation of the drum shaft and the loss of the blanket, due to the multiple sheets of paper entering the drum, the elastic blanket will generate larger convex bulges before and after the pressure area. This convex bulge increases the positive and negative rotation of the drum. Resistance makes it difficult to remove paper from the rollers. In this case, an effective method can be used to solve the problem based on the number of paper entering the drum and the location of the "stingy car":
1. Use a plate roller to manually turn the car. "Poor car" after the use of positive and negative inching machine method, can not be out of the pressure state of the paper, you can use the plate roller manual disc car, in order to use force to force the paper away from the roller.
2. Manually open the pressure from the pressure. After the “stingy carâ€, if the manual car cannot pull the paper out of the roller, the wrench can be used to turn the hexagonal screw on the clutch shaft head of the operation surface of the rubber roller, and the manual roller pressure is used to release the rubber roller from the pressure.
3. Increase the center distance of the roller to reduce the pressure. When the number of sheets is large and the above method cannot be solved, the center distance between the blanket cylinder and the impression cylinder may be increased by using a spanner to turn the blanket cylinder pressure regulator to change the angle of the outer eccentric sleeve, thereby achieving Reduce the pressure and make the paper withdraw from the roller.
4. Change the angle of the eccentric sleeve in the blanket cylinder to remove the pressure: When the number of rollers is large and the “stingy car†phenomenon is serious, and the adjustment pressure cannot be solved, only the method of using external force to change the eccentric camp inside the blanket is used to reduce the pressure. Pressure, the method is: first remove the puller plate connected to the coaxial sleeve on both sides of the rubber roller clutch shaft, use the iron rod to align with the recess of the outer edge of the sleeve, and tap the operating surface and the transmission surface sleeve with a sledgehammer, which is mainly changed by external force. Rubber roller eccentric sleeve angle. Make it less stressful and exit the paper.
5. Remove the eccentric sleeve inside the blanket. If a large number of paper feeds in the drum cause a serious “sudden car†phenomenon, and the above method still cannot be solved, the eccentric cylinder in the blanket cylinder must be removed to release the pressure between the blanket cylinder and the impression cylinder. The method is: 1 use a cork pad In fact, plug the rubber roller on both ends. 2 Remove the gear surface gears and other components and do a good job of marking, remove the operation surface affect the other parts of the rubber sleeve eccentric sleeve, must pay attention to the removal, must be carried out on the transmission surface and the operating surface at the same time, in order to prevent the drum shaft diameter deformation.
In a word, in the production process, the phenomenon of “stingy car†occurs from time to time, and it is impossible to adopt absurd methods such as cutting blankets or using fire. At the same time, in the prepress to strengthen the inspection of raw materials, the adjustment of the paper transport system, usually strengthen the maintenance and maintenance of the machinery, and take the appropriate measures to solve the problem as soon as possible.
1. Improper adjustment of the paper feeding system: the paper stack is higher than the front paper stopper, and multiple sheets of paper enter the drum.
2. Bulk paper blowing nozzle has a small air volume. Several sheets of paper in front of the paper stack are completely blown away. Under the action of the paper feeding nozzle, multiple sheets of paper are fed into the drum through the paper feeding board.
3. Thickness of the ink in the printed matter caused the paper to stick, and the paper was not completely loosely opened before being fed into the drum.
4. The double sheet controller misadjusts or malfunctions. When multiple sheets of paper are fed in, if multiple sheets of paper cannot be effectively sent and the paper feed is interrupted, multiple sheets of paper will enter the drum.
5. Before the regulation of electrical tooth failure, when the paper machine is not properly adjusted, there will be paper skew so that the overlay overlaps on the blanket, when the overlap reaches a certain thickness, there will be "boring car" failure.
6. Parts of the paper feeding components fall off, or there are other sundries in the regular parts that enter the drum to cause the mechanical overload operation and “sudden car†malfunction. Under normal circumstances, the two-color machine causes a "stingy car" fault. This has the characteristic that when the number of paper entering the roller is large, the "stingy car" often occurs between the first group of blanket rollers and the impression cylinder, and if the number of sheets enters the roller Less, due to various reasons such as the mechanical speed inertia force, it is possible that one or two sets of blanket cylinders are under pressure at the same time.
To sum up, the occurrence of “stingy cars†is mainly due to the fact that the machinery is suddenly subjected to a large external force during the operation process. This overloads the machinery. If it is not handled and eliminated in time, it will cause different degrees of damage to the machinery. Therefore, after the "stingy car" occurs, the pressure should be removed as soon as possible, and the paper under static pressure is withdrawn from the drum. In order to reduce the deformation of the drum shaft and the loss of the blanket, due to the multiple sheets of paper entering the drum, the elastic blanket will generate larger convex bulges before and after the pressure area. This convex bulge increases the positive and negative rotation of the drum. Resistance makes it difficult to remove paper from the rollers. In this case, an effective method can be used to solve the problem based on the number of paper entering the drum and the location of the "stingy car":
1. Use a plate roller to manually turn the car. "Poor car" after the use of positive and negative inching machine method, can not be out of the pressure state of the paper, you can use the plate roller manual disc car, in order to use force to force the paper away from the roller.
2. Manually open the pressure from the pressure. After the “stingy carâ€, if the manual car cannot pull the paper out of the roller, the wrench can be used to turn the hexagonal screw on the clutch shaft head of the operation surface of the rubber roller, and the manual roller pressure is used to release the rubber roller from the pressure.
3. Increase the center distance of the roller to reduce the pressure. When the number of sheets is large and the above method cannot be solved, the center distance between the blanket cylinder and the impression cylinder may be increased by using a spanner to turn the blanket cylinder pressure regulator to change the angle of the outer eccentric sleeve, thereby achieving Reduce the pressure and make the paper withdraw from the roller.
4. Change the angle of the eccentric sleeve in the blanket cylinder to remove the pressure: When the number of rollers is large and the “stingy car†phenomenon is serious, and the adjustment pressure cannot be solved, only the method of using external force to change the eccentric camp inside the blanket is used to reduce the pressure. Pressure, the method is: first remove the puller plate connected to the coaxial sleeve on both sides of the rubber roller clutch shaft, use the iron rod to align with the recess of the outer edge of the sleeve, and tap the operating surface and the transmission surface sleeve with a sledgehammer, which is mainly changed by external force. Rubber roller eccentric sleeve angle. Make it less stressful and exit the paper.
5. Remove the eccentric sleeve inside the blanket. If a large number of paper feeds in the drum cause a serious “sudden car†phenomenon, and the above method still cannot be solved, the eccentric cylinder in the blanket cylinder must be removed to release the pressure between the blanket cylinder and the impression cylinder. The method is: 1 use a cork pad In fact, plug the rubber roller on both ends. 2 Remove the gear surface gears and other components and do a good job of marking, remove the operation surface affect the other parts of the rubber sleeve eccentric sleeve, must pay attention to the removal, must be carried out on the transmission surface and the operating surface at the same time, in order to prevent the drum shaft diameter deformation.
In a word, in the production process, the phenomenon of “stingy car†occurs from time to time, and it is impossible to adopt absurd methods such as cutting blankets or using fire. At the same time, in the prepress to strengthen the inspection of raw materials, the adjustment of the paper transport system, usually strengthen the maintenance and maintenance of the machinery, and take the appropriate measures to solve the problem as soon as possible.
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