Analysis of the reasons for the staggering of the

Printing process: analysis of the reasons for the staggering of the rising and falling speed of the printing machine

the staggering of the rising and falling speed refers to the phenomenon of flower escape caused by the change of vehicle speed during the printing process of the printing machine. When dealing with this kind of fault, we must first eliminate the phenomenon that the printing machine does not escape flowers in the process of uniform printing, so as to accurately judge and analyze the reasons for the wrong flowers in the rising and falling speed. For the printing machine with coaxial collective transmission, the reasons for the rise and fall speed staggering are all caused by mechanical reasons, such as the guide belt is too loose, the pneumatic clutch slips, and the flower locking device is loose. However, the reasons for the rising and falling speed staggering of the circular independent drive printing machine are complex, which can be caused by both mechanical and electrical reasons. The reasons can be judged according to the characteristics of the staggering phenomenon

(1) stagger in the process of raising and lowering speed. When the speed changes, the pattern will stagger. When the speed increases, the pattern of the back circle will stagger in the direction of feeding. When the speed decreases, the pattern of the back circle will stagger in the direction of dropping. When the speed is stable, the pattern can be reset. This is caused by the short speed up and down time of the whole machine, the long response time of the independent drive control system and the slow dynamic response speed of the circular drive servo motor. It should be possible to implement the insurance compensation policy for the first batch of new materials, check the above situation one by one, and solve it

(2) stagger when the speed changes. When the speed is increased, the pattern of the back circle is staggered in the direction of falling cloth, and when the speed is reduced, the pattern of the back circle is staggered in the direction of entering cloth. When the speed is stable, the pattern cannot be reset, but when the speed returns to the original speed, the pattern can be reset. This is caused by the insufficient tension of the guide belt, because the tension of the guide belt varies with the speed during operation. The higher the speed, the greater the tension. For example, the tension of the guide belt is insufficient, and the guide belt is often twisted by different 4.2 steel parts, and the elongation caused by the heat treatment tension of the easily worn parts is also different. In addition, the improper velocity difference between the circle and the guide belt will also cause this kind of staggering

change the oil with suitable viscosity (3) when the speed changes, there is an irregular staggered pattern. The pattern cannot be reset after the speed stabilizes and when the speed returns to the original speed. This kind of staggered pattern generally also has the phenomenon of flower escape during normal printing. There are two reasons for this phenomenon. One is that the connecting end between the circular drive servo motor or stepping motor and the reducer is loose and slippery after the development of carbon nano for many years; Another reason is the control failure or interference of circular independent transmission