CN214311299U - Developing roller, developing box and printer - Google Patents

Abstract

The utility model discloses a developer roll, development box and printer. The developing roller comprises a mandrel and an elastic layer wrapping the mandrel, wherein the two ends of the mandrel are provided with a sheath, and one side of the sheath, which deviates from the mandrel, is provided with a plurality of grooves. Compared with the prior art, the utility model discloses a designed the recess on the sheath, when the sheath used recess and sensitization drum phase to match, sheath and sensitization drum not direct contact this moment, on the contrary with it, the elastic layer and the sensitization drum direct contact of developer roll this moment, because the elastic layer is rubber materials softer relatively, can play fine protection to the sensitization drum.

Description

Developing roller, developing box and printer

Technical Field

The utility model relates to a printer equipment technical field, especially a developer roll, development box and printer.

Background

The printing device is widely applied to life and work as an office appliance, and the photosensitive drum is used as an important component in the printing device for developing and imaging the printing device. An electrostatic latent image is formed on a photosensitive drum by an exposure unit such as a laser scanning unit in response to a digital image signal, and the electrostatic latent image is developed by a developer supplied from a developing roller, the developed image is transferred to a recording medium, and the transferred image is fixed on the recording medium by heating and pressing, thereby forming an image.

The long contact of sensitization drum and developer roll can cause destruction to sensitization drum surface, influences printing quality, consequently adjusts the size between the two through set up clearance adjustment spare between sensitization drum and developer roll. The existing gap adjusting method adopts a fixed adjusting mode, a rigid gap sheath is sleeved at two shaft ends of a developing roller, when the developing roller and a photosensitive drum are assembled too tightly, the sheath can be directly in rigid contact with the photosensitive drum, and the gap size is ensured, so that the mode has the following defects:

1. the rigid gap sheath is in rigid contact with the photosensitive drum, so that the surface of the photosensitive drum is abraded, and abnormal printing is easily caused;

2. the clearance adjustment is relatively fixed and cannot adapt to different clearance conditions. Because the sheath external diameter is fixed, the external diameter of a specification can only adjust the clearance between developer roll and the sensitization drum to fixed size, can't adapt to different situation, and the universality is relatively poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a developer roll, development box and printer to solve the technical problem among the prior art.

The utility model provides a developing roller, be in including dabber and parcel the outer elastic layer of dabber, the both ends of dabber are equipped with the sheath, deviating from of sheath one side of dabber is equipped with a plurality of recesses.

The developing roller as described above, wherein preferably, a mounting hole is formed through a center of the sheath, and the groove is annularly provided on an outer circumferential surface of the sheath.

The developing roller as described above, wherein preferably, at least two of the grooves have different groove depths.

The developing roller as described above, wherein preferably, the grooves include a first groove and a second groove, and a groove depth of the first groove is larger than a groove depth of the second groove.

The developing roller as described above, wherein preferably, there are two first grooves and two second grooves, and the two first grooves and the two second grooves are symmetrically disposed.

The developing roller as described above, wherein preferably, the bottom surface of the groove is an arc-shaped surface.

In the developing roller as described above, preferably, the elastic layer is made of rubber.

The developing roller as described above, preferably, a limiting member is further provided, and a functional end of the limiting member is connected to the sheath to limit the sheath from moving in the axial direction of the mandrel.

The utility model also provides a developing box, comprises a box bod, the box body includes the powder storehouse body and the useless powder storehouse body, be provided with as above on the powder storehouse body the developer roll, be equipped with the sensitization drum on the useless powder storehouse body, the developer roll with keep set clearance between the sensitization drum.

The utility model also provides a printer, including image device and foretell development box, the development box install extremely among the image device.

Compared with the prior art, the utility model discloses a designed the recess on the sheath, when the sheath used recess and sensitization drum phase to match, sheath and sensitization drum were not direct contact this moment, but the elastic layer and the sensitization drum direct contact of developer roll because the elastic layer is rubber materials softer relatively, can play fine protection to the sensitization drum, improved the stability of printing quality. Through the recess of the different degree of depth of design, can adapt to the clearance adjustment demand of difference between developer roll and the sensitization drum, improve the universality.

Drawings

FIG. 1 is a front view of a developing roller engaged with a photosensitive drum according to an embodiment;

FIG. 2 is a side view of a developing roller engaged with a photosensitive drum according to an embodiment;

FIG. 3 is a front view of a sheath according to an embodiment;

FIG. 4 is a side view of a sheath according to an embodiment;

FIG. 5 is a top view of a sheath according to an embodiment.

Description of reference numerals:

1-developing roller, 11-mandrel, 12-elastic layer, 13-sheath, 14-groove, 141-first groove, 142-second groove, 15-mounting hole;

2-photosensitive drum.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment provides a developing roller 1, the developing roller 1 is used for cooperating with a photosensitive drum 2, the photosensitive drum 2 is a key component in a laser printing developing powder box, the developing roller 1 plays a role in transferring carbon powder to the photosensitive drum 2, and the cooperation with the photosensitive drum 2 is particularly important, in the prior art, a rigid gap sheath on the developing roller 1 causes abrasion to the surface of the photosensitive drum, and the developing roller 1 is designed for the embodiment so as to solve the technical problems.

Specifically, as shown in fig. 1 and 2, the developing roller 1 includes a mandrel 11 and an elastic layer 12 wrapped outside the mandrel 11, wherein two ends of the mandrel 11 are provided with a sheath, and one side of the sheath facing away from the mandrel 11 is provided with a plurality of grooves 14. When the sheath is matched with the photosensitive drum 2 by using the groove 14, the sheath is not in direct contact with the photosensitive drum 2 at the moment, but the elastic layer 12 of the developing roller 1 is in direct contact with the photosensitive drum 2, and the elastic layer 12 is made of a rubber material and is relatively soft, so that the photosensitive drum 2 can be well protected. The whole life-span of the powder box is greatly influenced in the life-span of sensitization drum 2, consequently is very important to the protection of sensitization drum 2, and this design can be fine cooperation sensitization drum 2's operation, reduces the wearing and tearing to sensitization drum 2, prolongs sensitization drum 2's life.

Further, a mounting hole 15 penetrates through the center of the sheath 13, the sheath 13 penetrates through the mandrel 11 through the mounting hole 15 in the middle, the grooves 14 are annularly arranged on the outer circumferential surface of the sheath 13, the outer circumferential surface of the sheath 13 is a circular arc surface, and two adjacent grooves 14 are in transition through the arc surface.

And meanwhile, a limiting part is further arranged, and the functional end of the limiting part is connected with the sheath 13 so as to limit the sheath 13 to move along the axis direction of the mandrel 11, and meanwhile, the position of the sheath is fixed to avoid the sheath from rotating in a large amplitude. The limiting member may be a conventional structure in the prior art to achieve the limiting function, which is not described herein.

Further, at least two of the grooves 14 have different groove depths. By designing the grooves with different groove depths, the grooves 14 with the deeper groove depths face the contact portions when smaller gaps are needed, and the grooves 14 with the shallower groove depths face the contact portions when larger gaps are needed. Since the elastic layer 12 of the developing roller 1 is elastic and is deformed when being pressed by the photosensitive drum 2, the elastic gap adjusting space provided at this time is the rubber amount of the groove 14, and when exceeding a specified size, the sheath 13 is in direct rigid contact with the photosensitive drum 2, thereby preventing the developing roller 1 from further deforming and ensuring the gap distance.

In this embodiment, two grooves 14 with different groove depths are designed, and those skilled in the art may also design more grooves 14 according to actual needs and adjust the distribution of the grooves 14, which is not limited herein. As shown in fig. 3 to 5, the groove 14 includes a first groove 141 and a second groove 142, and the groove depth of the first groove 141 is greater than the groove depth of the second groove 142. Preferably, there are two first grooves 141 and two second grooves 142, and the two first grooves 141 and the two second grooves 142 are symmetrically disposed, taking fig. 3 as an example, the two first grooves 141 are symmetrically disposed up and down, and the two second grooves 142 are symmetrically disposed left and right. By designing the left and right grooves 14 and the upper and lower grooves 14, the adjustment of different gaps is adapted, and the universality is improved. In the actual assembly process, the clearance between the developing roller 1 and the photosensitive drum 2 is affected by the difference of the dimensional tolerance of the injection molding part, the clearance cannot be kept unchanged, when the two are loose, the first groove 141 is adopted to provide more allowance supplement, and when the two are tight, the second groove 142 is adopted to reduce the supplement allowance. Meanwhile, the elastic layer 12 of the developing roller 1 is soft per se and can well compensate for fluctuation during operation.

Further, the bottom surface of the groove 14 is an arc surface, and when the sheath 13 is in direct rigid contact with the photosensitive drum 2, the abrasion to the surface of the photosensitive drum 2 can be reduced due to the design of the arc surface.

Further, the elastic layer 12 is made of rubber. The rubber material is relatively soft, can play fine protection to sensitization drum 2, can well compensate the fluctuation of operation in-process simultaneously.

This embodiment still provides a developing box, includes the box body, the box body includes the powder storehouse body and the useless powder storehouse body, be provided with as above on the powder storehouse body developing roller 1, be equipped with sensitization drum 2 on the useless powder storehouse body, developing roller 1 with keep set clearance between the sensitization drum 2.

The embodiment also provides a printer, which comprises an imaging device and the developing box, wherein the developing box is arranged in the imaging device, and a carbon powder outlet of the developing box is butted with a carbon powder inlet in the imaging device.

The imaging principle is roughly as follows: an electrostatic latent image is formed on the photosensitive drum 2 in response to a digital image signal by an exposure unit such as a laser scanning unit, and the electrostatic latent image is developed by a developer supplied from a developing roller 1, the developed image is transferred to a recording medium, and the transferred image is fixed on the recording medium by heating and pressing, thereby forming an image.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims (10)

1. The developing roller comprises a mandrel and an elastic layer wrapping the mandrel, wherein two ends of the mandrel are provided with a sheath, and the developing roller is characterized in that one side of the sheath, which deviates from the mandrel, is provided with a plurality of grooves.

2. The developer roller according to claim 1, wherein a mounting hole is formed through a center of the sheath, and the groove is formed around an outer circumferential surface of the sheath.

3. The developer roller of claim 2, wherein at least two of said grooves have different groove depths.

4. The developer roller according to claim 2, wherein the grooves comprise a first groove and a second groove, and wherein a groove depth of the first groove is larger than a groove depth of the second groove.

5. The developing roller according to claim 4, wherein there are two of the first grooves and the second grooves, and the two first grooves and the two second grooves are symmetrically arranged.

6. The developer roller according to claim 1, wherein the bottom surface of the groove is an arc-shaped surface.

7. The developer roller according to claim 1, wherein the elastic layer is made of rubber.

8. The developer roller according to claim 2, further comprising a stopper, wherein a functional end of the stopper is connected to the sheath to restrict the sheath from moving in the axial direction of the mandrel.

9. A developing box is characterized by comprising a box body, wherein the box body comprises a powder cabin body and a waste powder cabin body, the powder cabin body is provided with a developing roller according to any one of claims 1 to 8, the waste powder cabin body is provided with a photosensitive drum, and a set gap is kept between the developing roller and the photosensitive drum.

10. A printer comprising an image forming apparatus and the developing cartridge according to claim 9, the developing cartridge being mounted to the image forming apparatus.

Images