It is known that the paper feeding mechanism of a sheet-fed printing press is an important auxiliary machine in the offset printing press. Its main component, the separation head, sucks the paper from the paper stack through a series of suction nozzles and blow nozzles. , Separation, transfer to the printing department. However, some people may not know that the paper feeder is also widely used in screen printing machines, gravure printing machines, automatic die cutting machines, laminating machines and other sheet-fed printing machinery and equipment.
According to different requirements, the paper conveyor can be divided into the following two types according to the accuracy and speed requirements:
Intermittent paper feeder: After the separation head feeds a sheet of paper into the printing section, it sends a second sheet of paper, which in turn circulates back and forth, mainly for low-speed printing machinery.
Chuan-flow paper conveyor: Separate head feeds paper continuously, and paper overlaps on the paperboard to achieve rapid paper feed. It is mainly used for high-speed printing machinery, and is currently mainly used for single-sheet multi-color printing machines.
The working principle of motion in printing engineering is:
1) The paper separation nozzle moves downwards, after sucking the top sheet, it is lifted up and backed up to prevent the double sheets from being sucked up, and is conducive to the insertion of the pressure paper blowing nozzle.
2) Insert the paper blowing nozzle, hold down the paper below and open the blowing air path to blow air, separate the sucked paper from the paper below, and detect the height of the paper stack at the same time.
3) The paper delivery nozzle sucks the paper and moves to the right. At this time, the paper separation nozzle and the paper delivery nozzle control the paper at the same time, and the paper is transferred, that is, the paper delivery nozzle is handed over to the paper delivery nozzle.
4) The paper-separating nozzle cuts off the air path and releases the paper. The paper transfer is completed and then rises. At this time, the paper-pressing nozzle stops blowing and leaves the stack, and the paper-handling nozzle moves to the left to output the paper. In order to ensure the correct delivery and transportation of paper, the paper delivery nozzle should achieve a certain trajectory (controlled by a cam).
5) With the continuous output of paper, the paper pile monitoring system of the paper conveyor can raise the height of the paper stack at any time to ensure the uninterrupted feeding of paper.
At present, there is no separate power source for the paper conveyor, and the movement comes from the transmission chain of the main machine of the printing press to ensure the coordination of operation. A printing machine independently driven by a paper feeder has been manufactured abroad, and a servo motor and a drive system are used to track the running speed of the host machine, and a batch of parts such as universal joints are omitted, which greatly improves the digital level of paper feed.
Best High Chair,Portable High Chair,High Chair,Wooden High Chair
NINGBO BABY FIRST BABY PRODUCTS CO.,LTD. , https://www.babyfirstseats.com