Printing machine maintenance and maintenance of the chain

The chain is an important link to ensure that the paper tooth row can accurately pull the paper from the impression cylinder, and its accuracy requirements are quite strict. From the standpoint of running stability, the chain discharge energy must always be tight. Relying on the sprocket on both sides of the take-up roller to prevent it from jumping and causing instability, the other is generating noise. The request of the take-up chain to take the paper from the last impression cylinder, and the transfer of the paper between the other cylinders same.

1. The speed of the tooth pad of the delivery chain is equal to the speed of the embossing cylinder pad, that is, it is transferred in a relatively stationary state.

2. The position of the receiving tooth pad and the position of the impression pad correspond to each other. It cannot advance or lag, resulting in unstable transfer.

3. The tooth pad of the delivery chain line should be on a plane, that is, the prerequisite condition of the paper positioning state should be ensured at the time of delivery, and the surface should have a large coefficient of friction.

4. The action of opening and closing the teeth of the slice of the delivery chain should be the same. That is to prevent the local friction drive from being damaged, causing the imprint to slip or tear.

5. The bite force of the receiving tooth row should be able to meet the printing requirements. Since the receiving chain row is directly involved in the printing process, its bite force must be large enough to remove the paper from the blanket cylinder, otherwise it will stick to the eraser. The surface of the cloth. However, if the bite force of the pad is too large, a long time impact will cause the position of the pad to change, which will affect the stability of the transfer.

The best way to solve this problem is to make the paper completely leave the blanket cylinder and then transfer it from the impression cylinder to the delivery cylinder so that there is little biting force in the delivery chain. Currently, there are devices to make the impression cylinder. Change to double-diameter cylinders, and some equipment added two transfer cylinders after the last group of impression cylinders.

From the point of view of the printing process, the final set of printing pressure is still properly reduced, the viscosity of the ink is also properly reduced, thereby reducing the transmission force required for separating sheets, and improving the working environment of the delivery chain.

6. The number of chain links in the receiving tooth row is a prime number (ie the number can only be divided by "1" or itself). This ensures that all chain links of the delivery chain are uniformly worn and can increase the overall life of the chain.

7. The operating stability of the delivery chain row. In addition to processing and installation guarantees, the stability of the delivery chain row must also be guaranteed from the design. There is a row between the two chain rows is the active chain row, a row should be In the auxiliary position, the two ends of the active chain must be absolutely accurate, and the position of the auxiliary chain must be absolutely accurate at the paper taking place, and at the other end, it can be in an automatic adjustment state, so as to prevent internal between the two chain rows. The force is present. The open jaws should be mounted on the side of the auxiliary chain so that this can act as a buffer.