Developing device and printer

Abstract

The utility model relates to a developing device, which comprises a powder bin, a developing device and a driving device, the developing roller is arranged at the powder outlet; the scraper is close to the position of the powder outlet and is pressed on the developing roller; and the at least one partition plate is arranged in the toner bin and is isolated between the toner adding opening and the toner outlet, and a gap is formed between the edge of the partition plate and the inner wall of the toner bin. According to the developing device, the partition plate is arranged between the powder inlet and the powder outlet in the powder bin and is used for bearing the pressure of a large amount of carbon powder in the powder bin on the scraper and the developing roller at the powder outlet, so that the extra pressure of the large amount of carbon powder on the scraper and the developing roller is reduced; and the stability of the carbon powder layer thickness and the carbon powder electric quantity after the surface of the developing roller passes through the scraper position is effectively ensured, and the quality of a printed image is ensured. Meanwhile, the adverse effect of carbon powder pressure on the surface of the developing roller or the scraper is avoided, and the influence on the quality of a printed image is further reduced. The utility model also relates to a printer comprising the developing device.

Description

TECHNICAL FIELD

[0001] The utility model relates to a developing device, and the utility model also relates to a printer applying the developing device. BACKGROUND

[0002] The developing device of the laser printer is provided with a plurality of components, usually including a developing roller and a developing doctor blade, the developing doctor blade comprising a developing doctor blade support and a developing doctor blade piece.

[0003] Usually, a powder bin is installed on the side close to the developing doctor blade, and the powder bin can contain toner. The amount of toner in the powder bin will also affect the developing pressure under the action of gravity. When there is no toner in the powder bin, stable developing pressure can be obtained through the extrusion of the developing roller and the developing doctor blade. However, when the powder bin is filled with toner, especially when a large amount of toner is filled in a large-capacity powder bin, the toner will extrude the developing doctor blade piece under the action of gravity, causing additional pressure on the developing doctor blade, so that the actual pressure on the developing roller is greater than the expected pressure value, affecting the thickness of the toner layer on the surface of the developing roller after passing the developing doctor blade position and the charging amount of the toner. In addition, excessive developing pressure may also have adverse effects on the surface of the developing roller or the developing doctor blade as the printing continues, which will affect the print image quality. SUMMARY

[0004] The first technical problem to be solved by the utility model is to provide a developing device that can reduce the influence of toner in the powder bin on the developing pressure.

[0005] The second technical problem to be solved by the utility model is to provide a printer applying the aforementioned developing device.

[0006] The technical solution adopted by the utility model to solve the first technical problem is as follows: a developing device, comprising a powder bin with a powder adding port and a powder outlet port;

[0007] a developing roller arranged at the powder outlet port position;

[0008] a doctor blade arranged on the developing roller close to the powder outlet port position;

[0009] a partition plate comprising at least one, the partition plate being arranged in the powder bin and isolated between the powder adding port and the powder outlet port, and the edge of the partition plate having a gap with the inner wall of the powder bin.

[0010] In order to better alleviate the extra pressure caused by the toner on the scraper and the developing roller, the partition is arranged in a direction that satisfies the requirement that the partition has a horizontal supporting force.

[0011] Preferably, the partition is tiltedly arranged in the powder bin with the axis of the powder bin extension direction as the rotation axis, and the edge of the partition on the upper side is connected to the inner wall of the powder bin, and there is a gap between the edge of the partition on the lower side and the inner wall of the powder bin.

[0012] Preferably, the uppermost partition is directed away from the powder outlet and tilted downward.

[0013] The structure is simple. The scraper includes a frame and a blade body arranged on the frame. The frame is fixedly arranged on the powder bin at a position above the powder outlet. The blade body extends to cover the upper part of the powder outlet.

[0014] The technical solution adopted by the present invention to solve the second technical problem is: a printer including the aforementioned developing device.

[0015] Compared with the prior art, the advantages of the present invention are as follows: the developing device of the present invention has a partition disposed between the powder inlet and the powder outlet in the powder hopper. The partition supports the pressure of the large amount of toner in the powder hopper on the scraper and the developing roller at the powder outlet, thereby reducing the additional pressure caused by the large amount of toner on the scraper and the developing roller. This effectively ensures the stability of the toner layer thickness and toner charge on the developing roller surface after passing the scraper, thereby ensuring the quality of printed images. At the same time, it also avoids the adverse effects of toner pressure on the developing roller or scraper surface, further reducing the impact on printed image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig. 1 It is a three-dimensional diagram of the developing device in the embodiment of the present utility model.

[0017] Fig. 2 This is a diagram of the internal structure of the developing device in an embodiment of the present utility model.

[0018] Fig. 3 It is a cross-sectional view of the developing device in the embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] like Figs. 1 to 3 As shown, the developing device in this embodiment includes a powder bin 1, a developing roller 2, a scraper 3 and a partition 4.

[0021] The powder tank 1 has a storage cavity for storing toner, and has a powder adding port 11 and a powder outlet port 12. The powder adding port 11 is usually arranged on the side wall of the powder tank 1 for facilitating toner filling, and can also be arranged on the top. The powder outlet port 12 is arranged at the bottom of the powder tank 1.

[0022] The developing roller 2 and the doctor blade 3 are arranged at the position of the powder outlet port 12. In order to facilitate powder output to the developing roller 2 and the doctor blade 3, the bottom of the powder tank 1 is usually curved towards the developing roller 2 and the doctor blade 3, so that the powder outlet port 12 is arranged at the bottom of the side of the powder tank 1. The toner in the powder tank 1 can be output to the powder outlet port 12 under the action of gravity. Of course, according to needs, a toner supply mechanism can also be arranged in the powder tank 1, and the toner can be moved to the position of the powder outlet port 12 by the action force of the toner supply mechanism.

[0023] The doctor blade 3 is arranged on the developing roller 2 and is closer to the position of the powder outlet port 12. The pressure of the doctor blade 3 on the developing roller 2 is factory-adjusted to a set developing pressure. Specifically, the doctor blade 3 includes a frame 31 and a blade body 32 arranged on the frame 31. The frame 31 is fixedly arranged on the powder tank 1 at a position above the powder outlet port 12. The blade body 32 extends upwards and covers the developing roller 2. During printing, the surface of the developing roller 2 reaches a required toner layer thickness and toner charge after passing the position of the doctor blade 3.

[0024] In order to accurately control the actual toner layer thickness and toner charge after the surface of the developing roller 2 passes the position of the doctor blade 3, the pressure of the toner in the powder outlet port 12 on the doctor blade 3 and the developing roller 2 needs to be strictly controlled. In this embodiment, the problem is solved by the partition plate 4.

[0025] Specifically, the partition plate 4 is arranged in the powder tank 1 and separates the powder adding port 11 and the powder outlet port 12. The edge of the partition plate 4 and the inner wall of the powder tank 1 have a gap 40. In this way, the partition plate 4 provides a supporting force for a large amount of toner in the powder tank 1, so as to avoid the large amount of toner in the powder tank 1 directly pressing the doctor blade 3 and the developing roller 2 at the powder outlet port 12. The gap 40 between the edge of the partition plate 4 and the inner wall of the powder tank 1 provides an output path for the toner, so as to ensure normal powder output at the powder outlet port 12.

[0026] The partition plate 4 includes at least one, and the number of the partition plate 4 is arranged according to needs. The space in the powder tank 1 is divided into several small spaces by the partition plate 4, and the gap 40 between the partition plate 4 and the inner wall of the powder tank 1 is used to realize the communication between the spaces, so as to smoothly guide the toner to the powder outlet port 12.

[0027] The setting position of the partition plate 4 in the powder tank 1 and the specific installation direction thereof are targeted at the ability of the partition plate 4 to share the pressure of the toner on the position of the powder outlet 12. In order to relieve the additional pressure of the toner on the doctor blade 3 and the developing roller 2 as much as possible, the setting direction of the partition plate 4 in the embodiment satisfies that the partition plate 4 has a horizontal supporting force, and based on the horizontal supporting force of the partition plate 4, the pressure of the toner on the doctor blade 3 and the developing roller 2 at the position of the powder outlet 12 can be shared to the maximum.

[0028] On this basis, in order to make the toner more smoothly reach the position of the powder outlet 12 based on gravity, the partition plate 4 is obliquely arranged in the powder tank 1 with the axis of the extension direction of the powder tank 1 as the rotation axis, and the edge of the partition plate 4 on the upper side is connected to the inner wall of the powder tank 1, and the edge of the partition plate 4 on the lower side has a gap 40 with the inner wall of the powder tank 1. More effectively, the uppermost partition plate 4 is inclined downwardly and guided to a position away from the powder outlet 12. The oblique arrangement of the partition plate 4 not only makes the partition plate 4 have a horizontal supporting force on the toner, but also guides the toner downwardly, so that the toner can more smoothly reach the powder outlet 12, and the printing requirements are met.

[0029] The developing device in the utility model, the partition plate 4 is arranged between the powder inlet and the powder outlet 12 in the powder tank 1, the pressure of a large amount of toner in the powder tank 1 on the doctor blade 3 and the developing roller 2 at the position of the powder outlet 12 is supported by the partition plate 4, and then the additional pressure of a large amount of toner on the doctor blade 3 and the developing roller 2 is reduced, the stability of the thickness of the toner layer and the electrification amount of the toner on the surface of the developing roller 2 after the position of the doctor blade 3 is effectively guaranteed, and the printing image quality is correspondingly guaranteed. Meanwhile, the adverse effects of the toner pressure on the surface of the developing roller 2 or the doctor blade 3 are avoided, and the influence on the printing image quality is further reduced.

[0030] The utility model still relates to a kind of printer, including the developing device as described above.

[0031] In the description and claims of the present application, terms are used that refer to the orientation of the device, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom", etc., which are used to describe various example structural parts and elements of the application. These terms are used only for convenience and are not intended to limit the application to any particular orientation. For example, "up" and "down" can be used merely to describe the example orientation of elements shown in the figures and can not necessarily be construed as limiting the application to any particular spatial arrangement.

Claims

1. A developing device comprising a powder tank (1) having a powder feeding port (11) and a powder outlet port (12); a developing roller (2) disposed at a position of the powder outlet port (12); a doctor blade (3) pressed against the developing roller (2) at a position near the powder outlet port (12); characterized in that further comprising a partition plate (4) including at least one, the partition plate (4) being disposed in the powder tank (1) and isolated between the powder feeding port (11) and the powder outlet port (12), and a gap (40) being provided between an edge of the partition plate (4) and an inner wall of the powder tank (1).

2. The developing device according to claim 1, characterized by: The partition plate (4) is disposed in a direction such that the partition plate (4) has a horizontal supporting force.

3. The developing device according to claim 2, characterized by: The partition plate (4) is disposed in the powder tank (1) in a tilting manner with respect to an axis in an extension direction of the powder tank (1), and an upper edge of the partition plate (4) is connected to the inner wall of the powder tank (1), and a gap (40) is provided between a lower edge of the partition plate (4) and the inner wall of the powder tank (1).

4. The developing device according to claim 3, characterized by: The uppermost partition plate (4) is directed to tilt downwardly away from the powder outlet port (12).

5. The developing device according to any one of claims 1 to 4, characterized by: The doctor blade (3) includes a frame (31) and a blade body (32) disposed on the frame (31), the frame (31) is fixedly disposed on the powder tank (1) at a position above the powder outlet port (12), and the blade body (32) extends to cover an upper portion of the powder outlet port (12).

6. A printer characterized by: A developing device as claimed in any one of claims 1 to 5.

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