WO2013078943A1

WO2013078943A1 - Shaft sleeve and toner cartridge using same

Info

Publication number: WO2013078943A1
Application number: PCT/CN2012/084367
Authority: WO
Inventors: 宋道权
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2011-11-30
Filing date: 2012-11-09
Publication date: 2013-06-06
Also published as: CN202362591U

Abstract

A toner cartridge comprises a developing roller and a shaft sleeve (1) provided at the end of the developing roller. The shaft sleeve (1) comprises an outer circumferential surface (11), an inner circumferential surface (12) and two opposite end surfaces (13, 14). The end surfaces (13, 14) are provided with grooves (23, 24), and the grooves (23, 24) are symmetrically arranged along the axial bisecting surface of the shaft sleeve (1).

Description

Bushing and toner cartridge using the same

The present invention relates to a bushing, particularly a bushing mounted on a developing roller in a toner cartridge, and a toner cartridge to which the bushing is mounted. The present invention is based on a Chinese utility model patent application filed on Nov. 30, 2011, with the application number 201120490171.9, the content of which is hereby incorporated by reference.

The toner cartridge is a consumable that is detachably mounted to the image forming apparatus. Such an image forming apparatus is an apparatus that uses photoelectric imaging technology, such as a laser printer, an LED printer, a laser copying machine, and the like.

The toner cartridge usually includes components such as a developing roller, a powder discharging knife, a photosensitive drum, a charging roller, and a cleaning blade, and these components cooperate to complete the development of the toner cartridge. Conventional developing rolls are usually equipped with bushings at both ends, the main function of which is to provide a spacing between the developing roller and the photosensitive drum and to keep the spacing constant. Therefore, the thickness of the bushing is critical to the control of the pitch. If the thickness of the bushing is more than the allowable range, it will appear during the printing process. "Printing whitish", "excessive powdering" and other phenomena, thus affecting the printing effect and quality requirements.

Referring to FIG. 1 and FIG. 2, the sleeve 9 is in the shape of a thick solid ring, and the glue position is thick, and the product is likely to cause uneven shrinkage after molding, so that the outer circumferential surface of the sleeve is irregular, and even the outer circumferential surface is deformed into The elliptical circumference, so that the thickness error of the sleeve will be far beyond the allowable range, and will not meet the requirements for use. Under the existing ordinary injection molding process conditions, the qualification rate of the bushing products is generally low, only maintained at about 40%.

The main object of the present invention is to provide a bushing of a novel structure which can effectively reduce uneven shrinkage after forming;

Another object of the present invention is to provide a toner cartridge constructed from the above-described novel structural bushing.

In order to achieve the above main object, the present invention provides a bushing including an outer circumferential surface, an inner circumferential surface and two opposite end surfaces, the end surface is provided with a groove, and the groove is evenly divided along the axis of the sleeve Call the setting.

Further, the connection between the outer circumferential surface and the two end surfaces has a chamfer of 45 degrees. Such a structure can further reduce the shrinkage of the outer circumferential surface, so that the sleeve has a uniform thickness.

In order to achieve the above other object, a toner cartridge provided by the present invention includes a developing roller and a sleeve mounted at an end of the developing roller, the sleeve including an outer circumferential surface, an inner circumferential surface and opposite end faces. The end surface is provided with a groove, and the groove is symmetrically disposed along a plane of the sleeve.

Further, the joint between the outer circumferential surface of the sleeve and the two end surfaces has a chamfer of 45 degrees. Such a structure can further reduce the shrinkage of the outer circumferential surface of the sleeve, so that the sleeve has a uniform thickness, so that a constant spacing between the developing roller and the photosensitive drum is provided to improve the printing quality.

The sleeve of the present invention has a groove structure on the end face thereof which can reduce the shrinkage of the sleeve during the molding process. Under the existing ordinary injection molding process conditions, the product qualification rate can reach more than 90%, and the symmetrical groove arrangement can make the sleeve product shrink evenly, so that the sleeve has a uniform thickness.

In the toner cartridge of the present invention, the developing roller sleeve has a uniform thickness to have a constant spacing between the developing roller and the photosensitive drum, thereby improving the printing quality.

Figure 1 is a perspective view of a prior art bushing;

Figure 2 is a cross-sectional view of a prior art bushing;

Figure 3 is a perspective view of the sleeve of the present invention;

Figure 4 is a cross-sectional view of the bushing of the present invention.

Referring to Figures 3 and 4, the sleeve 1 is generally annular in shape and includes an outer circumferential surface 11, an inner circumferential surface 12, and opposing first end faces 13 and second end faces 14. The first end surface 13 is provided with a first recess 23, and the second end surface 14 is provided with a second recess 24. The first groove 23 and the second groove 24 are identical in shape and are disposed symmetrically in a plane along the axis of the sleeve. Relative to the existing solid circular bushings, the

grooves

23, 24 can reduce the shrinkage of the bushing during the forming process, and the symmetrical arrangement can make the bushing product shrink evenly, so that the bushing has a uniform thickness. In order to further reduce the contraction of the outer circumferential surface of the sleeve, the outer circumferential surface 11 has a 45 degree chamfer at the junction of the first end surface 13 and the second end surface 14.

The sleeve of the present invention has a groove structure on the end face thereof which can reduce the shrinkage of the sleeve during the molding process, and the symmetrical groove arrangement can make the sleeve product shrink evenly, so that the sleeve has a uniform thickness. Under the existing ordinary injection molding production process conditions, the product qualification rate can reach more than 90%.

The sleeve of the present invention can be applied to a toner cartridge. The toner cartridge includes a developing roller, a photosensitive drum (none of which is shown above), and a boss 1 having the above-described structure attached to the end of the developing roller. Since the sleeve 1 has a uniform thickness, it can ensure a constant distance between the developing roller and the photosensitive drum, thereby improving the printing quality of the toner cartridge.

The sleeve of the present invention has a groove structure on the end face thereof which can reduce the shrinkage of the sleeve during the forming process, and the symmetrical groove arrangement can make the sleeve product shrink evenly, so that the sleeve has a uniform thickness.

Claims

The sleeve includes an outer circumferential surface, an inner circumferential surface and two opposite end surfaces, wherein the end surface is provided with a groove, and the groove is symmetrically disposed along a plane of the sleeve.
The bushing according to claim 1, wherein the outer circumferential surface and the joint of the two end faces have a chamfer of 45 degrees.
a toner cartridge comprising a developing roller and a sleeve mounted at an end of the developing roller, the sleeve comprising an outer circumferential surface, an inner circumferential surface and opposite end surfaces, wherein the end surface is provided with a groove And the grooves are symmetrically disposed along a plane of the sleeve.
A toner cartridge according to Claim 3, wherein the outer circumferential surface of said sleeve and the joint of the two end faces have a chamfer of 45 degrees.