Powder accumulation prevention structure of developing roller
By setting an annular groove in the non-working area of the developing roller, the powder leakage and black edge problems caused by the accumulation of magnetic toner in high-speed printers are solved, and more efficient powder utilization and printing quality improvement is achieved.
Patent Information
- Application Number
- CN202422037757.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-08-21
AI Technical Summary
In high-speed printers, magnetic toner accumulation at the powder scraper leads to problems with powder leakage and black edges.
In the non-working area of the developing roller, an annular groove coaxially with the central axis is provided. The powder scraper contacts the inner wall of the groove to form a guide hole to evacuate magnetic carbon powder to prevent the accumulation of toner at both ends of the powder control knife.
Reduce the powder leakage in the felt of the powder sealing, avoid the occurrence of black edges, and improve the printing quality.
Smart Images
Figure CN223205775U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a developing roller, in particular to a powder accumulation prevention structure of the developing roller. Background Art
[0002] Currently, a laser printer using magnetic toner mainly includes a developing roller and a powder control knife and a scraper knife in contact with the surface of the developing roller. The powder control knife is made of microporous sponge, while the scraper knife is made of rubber. When the magnetic toner is adsorbed from the powder hopper to the developing roller, it is controlled by the powder control knife and charged by friction, and then driven by the developing roller to the position corresponding to the photosensitive drum for development. The remaining magnetic toner is driven by the developing roller to the position of the scraper knife, and is scraped off the developing roller by the scraper knife and returned to the powder hopper for reuse.
[0003] In some high-speed printers, because the developing roller rotates at a high speed, the amount of magnetic toner delivered to the scraper is relatively large, and the speed of the magnetic toner is relatively fast. The magnetic toner cannot be completely and promptly scraped off the surface of the developing roller by the scraper. Over time, it tends to slowly accumulate at the scraper and form accumulations at both ends of the scraper along the length of the scraper, which puts great pressure on the powder sealing felt at both ends of the scraper, which not only easily leads to powder leakage but also easily causes black edges when printing. Summary of the Invention
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a developing roller anti-powder accumulation structure.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] The developing roller anti-powder accumulation structure includes a developing roller, a scraper blade and a powder control knife. The area where the developing roller contacts the scraper blade includes a working area and a non-working area. The characteristic is that an annular groove coaxial with the central axis of the developing roller is provided on the non-working area, and the powder control knife can contact the inner wall of the annular groove.
[0007] The depth H of the annular groove is 0.3 mm to 0.7 mm.
[0008] The width W of the annular groove is 2 mm to 3 mm.
[0009] The developing roller comprises an aluminum tube and a plastic shaft head tightly matched with the aluminum tube, and the annular groove is located on the aluminum tube.
[0010] The surface of the aluminum tube is coated with a coating, and the coating area is a working area.
[0011] The beneficial effects of the present invention are as follows: an annular groove coaxial with the central axis of the developing roller is provided on the non-working area of the developing roller, and the powder control knife can contact the inner wall of the annular groove. Because the scraper knife is made of rubber with a certain hardness, the scraper knife will not be embedded in the interior of the annular groove when contacting the surface of the developing roller. The annular groove forms a guide hole for guiding magnetic carbon powder between the scraper knife and the developing roller, so that the magnetic carbon powder can be guided through the guide hole to avoid accumulation at both ends of the powder control knife, thereby reducing powder leakage at the powder sealing felt and avoiding black edges caused by accumulation of magnetic carbon powder at both ends of the powder control knife. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 It is a schematic diagram of the working principle of the utility model;
[0014] Figure 2 It is a structural diagram of the developing roller. DETAILED DESCRIPTION
[0015] The advantages and features of the present disclosure and its implementation methods will be illustrated by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be comprehensive and complete and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is limited only by the scope of the claims.
[0016] The shapes, sizes, proportions, angles and numbers disclosed in the drawings for describing the embodiments of the present disclosure are merely examples, and therefore the present disclosure is not limited to the details shown. Throughout this specification, the same reference numerals refer to the same elements. In the following description, when a detailed description of a related known function or configuration is determined to be unnecessary to obscure the focus of the present disclosure, the detailed description will be omitted. Where “including”, “having” and “comprising” described in this specification are used, other components may be added unless “only” is used. Unless otherwise indicated, terms in the singular may include plural forms.
[0017] When explaining an element, although not explicitly described, the element is understood to include a range of error.
[0018] When describing a positional relationship, for example, when the positional relationship is described as "on," "above," "below," and "adjacent to," one or more parts may be arranged between two other parts, unless "immediately" or "directly" is used.
[0019] When describing a temporal relationship, for example, when a temporal order is described as “after,” “subsequently,” “next,” and “before,” discontinuous cases may be included unless “just” or “directly” is used.
[0020] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from other elements. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of this disclosure.
[0021] As will be fully appreciated by those skilled in the art, the features of the different embodiments of the present disclosure may be coupled or combined with each other in part or in whole, and may cooperate with each other in various ways and be driven technically. The embodiments of the present disclosure may be performed independently of each other, or may be performed together in a mutually dependent relationship.
[0022] Reference Figure 1 、 Figure 2 The utility model discloses a developing roller anti-powder accumulation structure, including a developing roller 1, a powder scraper 2 and a powder control knife 3. The area where the developing roller 1 contacts the powder scraper 2 includes a working area and a non-working area. The non-working area is provided with an annular groove 4 coaxial with the central axis of the developing roller 1, and the powder control knife 3 can contact the inner wall of the annular groove 4.
[0023] The structures and positions of the powder scraping knife 2 and the powder controlling knife 3 in the above structure are not changed, so their specific structures and connection relationships are not described in detail.
[0024] In the above structure, the developing roller 1 includes an aluminum tube and a plastic shaft head 5 that fits tightly with the aluminum tube. The annular groove 4 is located on the aluminum tube. The developing roller 1 is installed in the toner cartridge through the plastic shaft head 5. Its installation structure has not changed, so the specific structure is not described in detail. The surface of the aluminum tube is coated with a coating 6. The coating 6 area is the working area. The coating 6 is a conductive wear-resistant material. Of course, it is a product of the prior art. Of course, because the two ends of the aluminum tube also need to contact and seal with the sealing felt and install the attached sleeve, the ends on both sides of the working area are non-working areas. Of course, the non-working area does not need the coating 6, so the annular groove 4 is set in the non-working area and is adjacent to the sealing felt, and the two ends of the scraper 2 are also adjacent to the sealing felt, which can better dredge the accumulated magnetic carbon powder.
[0025] Because the scraper blade 2 is preferably made of rubber with a certain hardness, the scraper blade 2 will not be embedded in the annular groove 4 when it contacts the surface of the developing roller 1. The annular groove 4 forms a guide hole for guiding the magnetic carbon powder between the scraper blade 2 and the developing roller 1, so that the magnetic carbon powder can be guided through the guide hole to avoid accumulation at both ends of the powder control blade 3. Because the powder control blade 3 is preferably a microporous sponge, which is relatively soft and closely adheres to the surface of the developing roller 1, the microporous sponge can be squeezed into the annular groove 4, so that the magnetic carbon powder guided from the guide hole will fall into the powder bin 7 under the scraping of the powder control blade 3. In this way, the above structure allows the powder control blade 3 to share part of the scraping function, thereby avoiding the accumulation of magnetic carbon powder at both ends of the powder control blade 3 due to the high speed of the developing roller 1 of the high-speed printer and the large amount of magnetic carbon powder.
[0026] Because the aluminum tube of the present application is relatively thin, and considering that the microporous sponge must be able to closely contact the annular groove 4, the depth H of the annular groove 4 is preferably 0.3mm-0.7mm. This ensures the strength of the aluminum tube and the close contact of the microporous sponge with the annular groove 4. Of course, due to limited space, the width W of the annular groove 4 is preferably 2mm-3mm.
[0027] The above is a detailed introduction to the anti-powder accumulation structure of the developing roller provided in an embodiment of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, based on the idea of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.
Claims
1. A developing roller anti-powder accumulation structure, comprising a developing roller, a powder scraper, and a powder control knife. The contact area between the developing roller and the powder scraper includes a working area and a non-working area. The structure is characterized by: An annular groove coaxial with the central axis of the developing roller is provided on the non-working area, and the powder controlling knife can contact the inner wall of the annular groove.
2. The developing roller anti-powder accumulation structure according to claim 1, characterized in that: The depth H of the annular groove is 0.3 mm to 0.7 mm.
3. The developing roller anti-powder accumulation structure according to claim 1, characterized in that: The width W of the annular groove is 2 mm to 3 mm.
4. The developing roller anti-powder accumulation structure according to claim 1, characterized in that: The developing roller comprises an aluminum tube and a plastic shaft head tightly matched with the aluminum tube, and the annular groove is located on the aluminum tube.
5. The developing roller anti-powder accumulation structure according to claim 4, characterized in that: The surface of the aluminum tube is coated with a coating, and the coating area is a working area.