Movable connecting structure for shaft head and roller body of developing roller

Abstract

The utility model discloses a movable connecting structure of a developing roller shaft head and a roller body, which comprises a transmission shaft head and the roller body, and is characterized in that the transmission shaft head comprises a connecting end, the connecting end is in loose fit with the roller body, and a movable connecting structure is arranged between the connecting end and the roller body. The roller body can be driven by the movable connecting structure to rotate and achieve deflection. Therefore, the roller body can be driven by the movable connecting structure to rotate and can perform tiny deflection correction during rotation, clamping stagnation and abrasion are reduced, it is guaranteed that the roller body rotates stably and smoothly, and then the printing quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to a developing roller of a laser printer, in particular to a movable connecting structure of a developing roller shaft head and a roller body. Background Art

[0002] A typical developer roller typically consists of a shaft head and a roller body. The shaft head consists of a drive shaft head and a driven shaft head. The roller body is typically an aluminum tube, while the drive shaft head and driven shaft head are made of plastic. One end of the aluminum tube tightly fits the drive shaft head, while the other end fits the driven shaft head. The drive shaft head and driven shaft head rotate in corresponding locating holes on the toner cartridge side cover. A transmission gear is fixed to the drive shaft head, which meshes with the gear drive mechanism in the printer to transmit power.

[0003] However, in the above structure, positioning holes are provided on both side covers, and the transmission shaft head and the driven shaft head are respectively rotatably matched with the corresponding positioning holes. Due to errors in processing and assembly, the positioning holes on the two side covers cannot be absolutely concentric. Therefore, when the roller body is driven by the gear drive mechanism, it is easy to cause the transmission shaft head or the driven shaft head to get stuck with the positioning holes. In addition, the transmission shaft head, the driven shaft head and the positioning holes are greatly worn, thereby affecting the printing quality.

[0004] The applicant has designed a movable connection structure between the developing roller shaft head and the roller body to solve the above problems. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a movable connection structure of a developing roller shaft head and a roller body.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A movable connection structure between a developing roller shaft head and a roller body includes a transmission shaft head and a roller body, and is characterized in that the transmission shaft head includes a connecting end, the connecting end is loosely matched with the roller body, and a movable connection structure is provided between the connecting end and the roller body, and the roller body can be driven by the movable connection structure to rotate and realize deflection.

[0008] The movable connection structure includes a plurality of grooves or a plurality of protrusions arranged on the inner hole wall of the roller body and a plurality of protrusions or a plurality of grooves arranged on the transmission shaft head, and the protrusions can achieve point contact with the grooves.

[0009] The groove is a square groove, and the protrusion is provided with an arc surface, which is in point contact with the groove wall of the square groove.

[0010] The notch edge of the groove is in point contact with the arc surface.

[0011] The protrusions are arc points formed by stamping the roller body.

[0012] The gap between the connecting end and the inner hole of the roller body is H, and the range of H is preferably: 0.05mm-0.15mm.

[0013] The beneficial effect of the present invention is that a movable connection structure is provided between the connecting end of the transmission shaft head of the present invention and the roller body, and the connecting end is loosely matched with the roller body, so that the roller body can be driven to rotate by the movable connection structure and can make slight deflection corrections when rotating, thereby reducing jamming and wear, ensuring the smooth rotation of the roller body, and thus ensuring the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a partial longitudinal sectional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the local longitudinal section structure when the drive shaft head deflects relative to the roller body;

[0018] Figure 4 It is a structural diagram of the transmission shaft head. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] When explaining an element, although not explicitly described, the element is understood to include a range of error.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Reference Figures 1 to 4 The utility model discloses a movable connection structure of a developing roller shaft head and a roller body, comprising a transmission shaft head 1 and a roller body 2, wherein the transmission shaft head 1 comprises a connecting end 3, wherein the connecting end 3 is loosely fitted with the roller body 2, and the specific range of the loose fit is: the gap between the connecting end 3 and the inner hole of the roller body 2 is H, and the range of H is preferably: 0.05mm-0.15mm. The preferred value of H is 0.1 or 0.08 or 0.12. Under such a gap, the deflection space of the connecting end 3 in the roller body 2 is guaranteed, and the connection will not be too loose. A movable connection structure is provided between the connecting end 3 and the roller body 2, so that the roller body 2 can be driven by the movable connection structure to rotate and realize its own slight deflection.

[0027] As shown in the figure, the movable connection structure includes multiple grooves 5 or multiple protrusions 4 provided on the inner hole wall of the roller body 2, and multiple protrusions 4 or multiple grooves 5 provided on the transmission shaft head 1. The protrusions 4 can achieve point contact with the grooves 5. The present application has two grooves 5, which are evenly arranged in an annular shape to form a symmetrical structure. One end of the groove 5 is located on the connecting end 3 and the other end extends to penetrate the outside world. The above is convenient for processing. The inner hole wall of the roller body 2 is provided with a corresponding protrusion 4. Because the roller body 2 is relatively thin, it is not suitable for grooving. Of course, three grooves 5 corresponding to three protrusions 4 can also be used.

[0028] The specific contact structure is as follows: the groove 5 is a square groove, and the protrusion 4 is provided with an arc surface, and the arc surface is in point contact with the groove wall of the square groove. In this structure, the maximum diameter of the arc surface is greater than the width of the groove 5, and the two groove edges of the groove 5 are in point contact with the arc surface, thereby forming an unstable two-point support, so that the connecting end 3 can achieve spatial deflection, but because there are two grooves 5 and they are symmetrically designed, the connecting end 3 actually has four contact points. Of course, there is a step surface on the transmission shaft head 1 that can abut against the corresponding end of the roller body 2, thereby preventing the roller body 2 from moving axially.

[0029] The protrusions 4 are arc points formed by stamping the roller body 2. Since the roller body 2 is an aluminum tube, which is relatively thin and soft, the arc points formed by stamping are easy to process and low in cost, and are also convenient to assemble.

[0030] The above is a detailed introduction to the movable connection structure of the developing roller shaft head and the roller body provided in the 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 and core idea of the present invention. At the same time, for general technical personnel in this field, according to 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 shaft head and roller body movable connection structure, comprising a drive shaft head and a roller body, characterized in that: The transmission shaft head includes a connecting end, which is loosely matched with the roller body, and a movable connecting structure is provided between the connecting end and the roller body. The roller body can be driven to rotate and realize deflection by the movable connecting structure.

2. The developing roller shaft head and roller body movable connection structure according to claim 1, characterized in that: The movable connection structure includes a plurality of grooves or a plurality of protrusions arranged on the inner hole wall of the roller body and a plurality of protrusions or a plurality of grooves arranged on the transmission shaft head, and the protrusions can achieve point contact with the grooves.

3. The movable connection structure between the developing roller shaft head and the roller body according to claim 2, characterized in that: The groove is a square groove, and the protrusion is provided with an arc surface, which is in point contact with the groove wall of the square groove.

4. The developing roller shaft head and roller body movable connection structure according to claim 3, characterized in that: The notch edge of the groove is in point contact with the arc surface.

5. The developing roller shaft head and roller body movable connection structure according to claim 2, characterized in that: The protrusions are arc points formed by stamping the roller body.

6. The developing roller shaft head and roller body movable connection structure according to claim 1, characterized in that: The gap between the connecting end and the inner hole of the roller body is H, and the range of H is preferably: 0.05mm-0.15mm.

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