Because Small Portable Receipt Printer has high voltage circuit and high temperature circuit, so electron radiation and thermal radiation are to human body has certain influence, should pay attention to the protection of pregnant woman and child or stay away from these equipment. In the printing process, the high temperature heating will bring out some powder and ink particulate matter, which is not good for breathing, so you should try to avoid working at the side of the laser printer for a long time.
charging
The photoconductor material on the surface of the photosensitive drum is an insulator in the absence of light. To realize the "electrostatic latent image" on the surface of the light guide body, it must be charged on the surface of the light conductor to make it charged. Only in this way, when the laser beam is scanned onto the photoconductor, the exposed point of the photoconductor is switched on, forming a lattice of light beams. When the sensor drum rotates to the tangential position with the developing magnetic roller, the ink powder on the magnetic roller is attracted to the surface of the sensor drum and the ink image is shown on the sensor drum.
In order to absorb carbon powder in accordance with the image and text, the toner drum should be charged first. The charging electrode is a tungsten wire parallel to the drum shaft, with a dc high pressure of 5 ~ 7kV. When the toner drum is very close to the tungsten wire, the air around it is ionized to generate corona discharge, which makes the drum charged. The positive and negative voltage is determined by the voltage of the tungsten filament. If the photoconductive material is a selenium-tellurium alloy, it will be charged with positive electricity. After rotating for a week, the entire surface of the photosensitive drum will be charged.
The specific charging method adopted by the Panel Receipt Printer for the photosensitive drum is different due to different models. However, the charging principle is basically the same, all of which use the dc high voltage corona discharge to charge the photosensitive drum surface.
The early production of Label Printer China used electrode wire and grid compound structure to charge more, most of the new laser printers used to charge the photosensitive drum with the rubber roller (FCR). When the high voltage generator is sent to the electrode wire for a high voltage, a strong electric field is formed between the electrode wire and the grid and corona is released. Ionize the air between the electrode wire and the photosensitive drum, and the air ions move towards the surface of the photosensitive drum, making the surface of the photoconductor (photosensitive drum) full of charge. This method can make the photoconductor (photosensitive drum) surface charged evenly, but also produce a lot of negative ions (ozone). When ozone accumulates to a certain amount, it is harmful to the human body. Such as Canon's early products lbp-sx and ST, HP's early products HP2, 3 and panasonic KX6500 produced in Japan, lenovo LJ6L, LJ6P and other models are charged by this method.
Most of the modern Receipt Printer China are charged by the charging roller. Due to the contact charging mode, high charging voltage is not required, and no ozone is produced. However, due to the accumulation of ionizing dust, the abrasion of the photosensitive drum is increased, and the charging is not even.
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