introduction
In a sheet-fed printing press, the movement speed of the paper on the paperboard has a great influence on the positioning accuracy of the paper. Generally speaking, if the paper feeding speed is between 0.2m / s ～ 0.3m / s, it can ensure that the paper does not rebound or break when it reaches the front gauge. However, as the printing speed of the printing press continues to increase, the paper feed speed is also getting faster and faster, and now this speed generally exceeds 0.5m / s. Some printing machines even reach 0.7m / s. Such a paper feeding speed brings great difficulties to accurate positioning. In this paper, the elliptical gear mechanism is used to improve the paper conveying mechanism, so that the speed of the paper when it reaches the front gauge is significantly reduced, thereby improving the paper conveying performance of the printing machine, and has a greater effect on improving the positioning accuracy and comprehensive performance of the printing machine. Practical value.
Movement principle of elliptic gear mechanism
Wheel 1 and wheel 2 are two elliptical gears that mesh with each other and have the same parameters. They rotate around O1 and O2 respectively, and O1 and F1 are the focal points of ellipse 1, and O2 and F2 are the focal points of ellipse 2. Let a, b, and c be the major axis, minor axis, and half focal length of the ellipse, respectively, then the eccentricity of the ellipse e = c / a. The sum of the distance from any point on the ellipse to the two focal points is constant and equal to its long axis 2a.
Using elliptical gear mechanism to improve the transmission system of SZ206 paper conveyor
â‘ The paper transmission form of the domestic SZ206 paper machine
The power of the printing host is transmitted to the sprocket 1 via the chain drive, so that the paper feed clutch shaft A rotates at a constant speed, and its rotation speed is synchronized with the printing host, that is, the printing cylinder rotates once and the paper feed clutch shaft also rotates.
A gear 2 is installed at the shaft end of the paper conveying clutch, and power is transmitted to the shaft end gear 5 of the paper conveying belt roller B through the two intermediate wheels 3 and 4, thereby driving the paper conveying roller B to rotate.
The paper feeding step of this machine is 200mm, and the maximum printing speed is 10000 prints / hour, so the maximum paper feeding speed can be calculated as 0.55 meters / second.
â‘¡The improved paper transmission system
The transmission method of the paper belt roller of the SZ206 paper machine is improved to another form. The improved conveyor belt roller is not driven by gears 2, 3, 4, and 5, but the elliptical gear 6 on the clutch shaft A drives another oval gear 7 that meshes with it, so that the conveyor belt roller Realize rotation. At this time, the gear 5 is set empty on the roller of the conveying belt. Due to the transmission characteristics of the speed ratio of the elliptical gear, the rotation speed of the paper belt roller is fluctuated.
in conclusion
1. The use of an elliptical gear mechanism can ensure that the speed of the paper always reaches a certain level when it reaches the feed belt roller, and is equal to the speed of the paper receiving roller.
2. When the paper reaches the front gauge, the speed is about 0.33 meters / second. This speed can ensure that the paper does not rebound and is not damaged.
3. The paper feeding process on the paperboard is a variable speed process, but this change has little effect on the paper transport and positioning.
4. In practical application, in order to ensure the stability of the mechanism movement, the flywheel and other devices can be installed on the elliptical gear shaft.
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