Pressure of the paper pressing wheel of the hottes

2022-07-30
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The j2180 offset press uses a roller continuous side gauge. Its working principle is that a 45 spiral cylindrical fan gear and an end face cylindrical cam are installed on the side gauge transmission shaft to control the uniform rotation of the paper twisting wheel and the periodic up and down swing of the paper pressing wheel of the regular plate respectively, so that the paper twisting wheel and the paper pressing wheel coordinate and coordinate, and the paper is pulled to the regular position

the paper twisting wheel rotates at a uniform speed, so it will not produce vibration, resulting in inaccurate overprint. However, the uniform rotation of the paper twisting wheel makes the paper pulling speed constant, which depends on the rotation speed of the machine. Generally, we only notice the lifting time and pulling time of the side gauge paper pressing wheel, and it is easy to ignore the pressure of the side gauge paper pressing wheel. Some people believe that the overprint accuracy can be guaranteed as long as the handover time between the side gauge, front gauge and the paper feeding tooth is correct, while the pressure of the side gauge paper pressing wheel is light or heavy, which has no impact on the overprint accuracy. In fact, this is not comprehensive in the action plan for accelerating the development of new material industry in Zhejiang Province (2019 (2) 022)

the difficulty in adjusting the accuracy of regular overprint is that some seemingly insignificant parts that actually play a vital role are most likely to be ignored. For example, the pressure of the side gauge paper pressing wheel will directly affect the accuracy of horizontal overprint. When the paper is conveyed to the front gauge paper stop bend for positioning through the paper feeding tray, the side gauge paper pressing wheel will drop the paper

if the pressure of the paper pressing wheel is too heavy at this time, the paper may be arched at the side baffle board due to the paper pulling force greater than the bending strength of the paper after the paper sheet is pulled in place, resulting in over pulling of the paper sheet; If the pressure of the paper pressing wheel is too light, that is, when the paper twisting force is slightly less than the quality of the printed paper, the paper is pulled to the stop board, but due to insufficient force, the paper can not be completely close to the side stop board, resulting in insufficient pulling and affecting the accuracy of side gauge overprint; When the paper twisting force is equal to the average quality of the printed paper, due to the influence of various factors of the paper itself, which reflects the role of large manufacturers, there are different paper quality, humidity and other indicators, which is also easy to cause horizontal overprint error

we believe that the pressure of the side gauge paper pressing wheel should be determined according to the size, thickness, temperature, printing speed and other indicators of the printed paper, which should be slightly greater than the average quality of the printed paper and less than the bending strength of the printed paper

position of front and side gauge baffles

the regular line of the printed product is mainly determined by the positioning position of the front and side gauge baffles in the machine. Only when the front and side gauge baffles are completely flush with the edge of the printed paper, that is, when they are in line contact with the edge of the paper, can we ensure that the paper rules will not cause unstable positioning of the paper at each rule due to the influence of self-knowledge factors, resulting in overprint accuracy errors, This involves the perpendicularity of the two adjacent edges of the paper and the positioning position of the two baffles

speed up the upgrading of plastic granulator technology. In general, the bending positioning line of the front gauge should be perpendicular to the positioning line of the side gauge baffle. In this way, when the paper is transported to the front gauge and the side gauge for positioning, the two sides of the bird will be in line contact with the regular positioning baffle to ensure accurate and stable positioning and the accuracy of overprint

if the front gauge and the side gauge baffle are not vertical at this time, the edge of the paper positioning is skewed with the two gauge baffle plates, so that the edge of the paper is not completely in contact with the baffle. Therefore, the contact area is small (point contact). We have been involved in various innovative projects, and the positioning is unstable, resulting in unstable positioning of the paper. Under special circumstances (such as the adjacent edges of the used paper are not vertical), the two baffles shall be properly adjusted according to the adjacent angle of the edges of the paper, so that the edges of each baffle are parallel to the edges of the paper, so as to ensure the stability of positioning

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