Developing roller and developing box

Abstract

The invention relates to a developing roller for a laser printer, and particularly relates to a developing roller with small rotation torque and good end part sealing property. The developing roller comprises a developing roller body and a developing roller shaft, wherein the developing roller body is sleeved outside the developing roller shaft, and inwards-concave grooves matched with sealing members at end parts of the developing roller are respectively formed in non-developing regions at two ends of the developing roller body along the circumferential direction. The invention also provides a developing box comprising the developing roller. The developing box comprises a developing roller and sealing members, wherein the developing roller is rotatably supported on a developing roller bracket; inner circumferential surfaces of the sealing members are matched with the inwards-concave grooves in a sealing manner; outer circumferential surfaces of the sealing members are matched with two ends of the developing box in a sealing manner. Because the inwards-concave grooves matched with the sealing members at end parts of the developing roller are respectively formed in the non-developing regions at two ends of the developing roller body, the sealing property of two ends of the developing roller is better, the friction force between the developing roller and the sealing members is reduced, the rotation torque of the developing roller and the developing box is reduced, and the printing quality is improved.

Description

technical field [0001] The invention relates to parts of a laser printer, in particular to a developing roller for the laser printer and a developing box with good sealing performance and small rotational torque. Background technique [0002] Laser printer is currently one of the most widely used computer external output devices. It uses the physical and chemical principles of light, electricity, and heat to output text or images through interaction. The entire imaging process can be divided into charging, exposure, development, transfer, etc. Seven steps including printing, fixing, cleaning, and power elimination. [0003] In the above imaging process, the developing roller rotates to output the toner in the developing cartridge to the developing cartridge, because there is a gap between the end of the developing roller and the developing roller support on both ends of the developing cartridge, and the gap between the developing roller shaft and the developing roller suppor...

AI Technical Summary

Problems solved by technology

In order to achieve a sufficient sealing effect, the end of the developing roller must be in close contact with the felt and strongly squeeze or compress the entire seal, increasing the friction between the developing roller and the felt; thus, the rotational torque of the developing roller increases, It produces excess load on the developing roller, which affects its mechanical life; and increases the rotational torque of the entire developing cartridge, which affects the printing quality; during high-speed rotation, the friction between the seal and the contact part of the developing roller is large, and the heat generated by friction causes the developing roller to The temperature at both ends rises, which leads to the deterioration of the developing roller body, and causes the temperature distribution of the developing roller body along the axial direction to be uneven, resulting in different temperatures of the toner at different places, which affects the printing quality; especially for resin-type toner, the heat It is easy to soften the toner and cause adhesion, which affects the development and printing quality

[0005] For the long-term use of the developing cartridge, due to the long-term friction between the developing roller and the felt, the surface of the developing roller is unevenly worn and the friction between the two is increased. The above-mentioned problems caused by the increased friction are more obvious; in use, the developing Increased fluctuations in the rotational torque of the cartridge, affecting print quality and reducing the mechanical life of the developing roller

In addition, the local friction caused by errors such as assembly or processing increases, which makes the local temperature higher, which aggravates the adverse effects of the above problems

[0006] For a developing cartridge that has been printed continuously for a long time, due to the strong extrusion and rotating friction, the developing roller and the felt will generate a lot of heat, which will affect the actual sealing effect of the seal, resulting in powder leakage

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