Printing machine blackout door use precautions
June 16, 2024
The shutter door device of the printing machine in the printing device is in a track. The opening and closing of the screen door of the plate-making machine requires a motor to agitate. When one of the exposures is over, the relay is used to turn on the power of the control signal, and the control relay of the shutter is closed, so that the motor works after being turned on and pushes the shutter to follow the track trace to the closed end.
During the movement of the above-mentioned printing machine, the internal structure of the stroke switch is composed of a tension spring and a top spring. When the shutter is closed, the travel switch should have been disconnected after being hit by the shade door. However, when the internal stress of the tension spring and the top spring inside the printing machine is too large, the shutter is bounced back, which causes the stroke switch to reclose.
In the printing machine, the control relay of the light-shielding door will repeatedly pull and close in a short time, which will not only produce a lot of noise, but also if the holding time is too long, the limit switch And the service life of the control relay is shortened.
Repeated chattering of the screen shade door during the closing process also affects the travel switch. Every time the stroke switch is subjected to a severe impact, the current that controls the iodine gallium lamp will quickly weaken, causing the light to dim. In the process, if the light-shielding door of the printing machine is bounced back, the stroke switch will be closed, and the current of the iodine-gamma lamp will become stronger. The current is weak and weak, which will shorten the service life of the iodine gallium lamp.
When selecting the metal sensor switch of the shader door, you should also pay attention to the following problems. Generally, a metal sensor switch with an induction interval of 1.5 to 2 mm should be selected. This type of switch was chosen because there is no brake in the motor of the screen door. If the sensing interval between the metal sensor switches we choose is too short, the screen door of the printer will enter the sensing interval and terminate the motor operation.
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