Paper separating mechanism of fuser

Abstract

The utility model relates to the technical field of printers, in particular to a paper separating mechanism of a fuser, which comprises a fuser roller, a paper separating component is arranged on one side of the fuser roller and comprises a base, a plurality of separating claws are rotatably mounted on the base, a first cambered surface tangent to the outer side surface of the fuser roller is arranged at the working end of each separating claw, and a second cambered surface tangent to the outer side surface of the fuser roller is arranged at the working end of each separating claw. A second cambered surface is also arranged at the working end of the separating claw; a protective gap is formed between the second cambered surface and the outer side surface of the fixing roller; the pressure intensity between the separating claw and the fixing roller is reduced through the second cambered surface, the separating claw is prevented from scratching the fixing roller when paper is clamped, and the stability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a paper separation mechanism of a fuser. Background Art

[0002] The printer's fuser is mainly composed of two rollers, called the heating roller and the pressure roller, and the distance between the two rollers is very small. When paper passes through, the pressure roller presses the paper against the heating roller, and the heating roller generates heat at the same time. In this way, through the heating and pressure of the two rollers, the toner attached to the paper can be pressed into the paper, making it difficult for the toner to separate from the paper. In order to prevent the paper from winding around the roller, a separator is fixedly installed on the fuser, and the paper is separated from the fuser by using the separator. Both the heating roller and the pressure roller can be called the fuser roller, but usually the roller in the fuser that is closer to the separator is called the fuser roller, usually the heating roller.

[0003] The existing separator relies on the paper to bend and automatically separate from the lower roller, which cannot guarantee the stability of paper separation, resulting in frequent paper jams; after the fuser has been running for a long time, the separator will be deformed by heat, reducing the installation distance between it and the heating roller, and there is a risk of scratching the roller at the sharp corners, which will eventually cause paper jams in the fuser; after the fuser has been running for a long time, there will be powder sticking on the surface of the separator, which needs to be cleaned or replaced regularly. When replacing, the installation gap needs to be adjusted, which is troublesome and costly.

[0004] The paper separation mechanism for a printer with application number CN202110785219.7 discloses a structure including a fixed base plate, a paper feeding mechanism, a paper separation mechanism and a paper box mechanism. The paper box mechanism, the paper feeding mechanism and the paper separation mechanism are installed in sequence on the fixed base plate along the negative direction of the X-axis. The paper box mechanism is connected to the paper feeding mechanism through a paper placing plate. The paper feeding mechanism and the paper separation mechanism are separated in sequence by a front paper guide and a rear paper guide along the negative direction of the X-axis. The paper placing plate, the front paper guide and the rear paper guide are connected to each other in sequence along the negative direction of the X-axis. It discloses a structure for paper separation using multiple rollers. Although it improves the paper separation efficiency, its structure is relatively complex, which is not conducive to later cleaning and maintenance. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the separation claws easily scratch the fixing roller during the paper separation process of the fixing device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] First, a fuser paper separation mechanism is provided, including a fuser roller, a paper separation assembly is provided on one side of the fuser roller, the paper separation assembly includes a base, a plurality of separation claws are rotatably mounted on the base, the working end of the separation claw is provided with a first arc surface tangent to the outer side surface of the fuser roller, and the working end of the separation claw is also provided with a second arc surface, and a protective gap exists between the second arc surface and the outer side surface of the fuser roller.

[0008] Furthermore, a smooth tangent transition surface is provided between the first arc surface and the second arc surface; the first arc surface and the second arc surface are connected by the transition surface, thereby ensuring that the structure of the separation claw is more reasonable.

[0009] Furthermore, the transition surface is a concave smooth surface; the concave transition surface prevents the separation claws from interfering during operation, making the device more stable to use.

[0010] Furthermore, the size of the protection gap is 0.02-0.04 mm.

[0011] Furthermore, the separation claw is integrally formed of ultra-high temperature resistant material and sprayed with a layer of fluorine coating on the surface; this makes the separation claw more reliable in a high temperature working environment and has good non-stick properties, reducing the number of cleaning times during use.

[0012] Furthermore, a rotating shaft is provided on the separation claw, a mounting plate is provided on one side of the base corresponding to the separation claw, and an L-shaped bracket is provided on the other side, and the rotating shaft is rotatably connected to the mounting plate and the L-shaped bracket; the mounting plate and the L-shaped bracket can be used to conveniently install the separation claw on the base, which is conducive to improving assembly efficiency and work efficiency.

[0013] Furthermore, a positioning hole is provided on the L-shaped bracket, and a positioning pin is provided at a position of the base corresponding to the positioning hole; the positioning hole and the positioning pin are used to position the L-shaped bracket to ensure the accuracy of the installation position of the L-shaped bracket.

[0014] Furthermore, a spring is provided between the separation claw and the base; the spring is used to make the working end of the separation claw tend to be pressed against the fixing roller, thereby ensuring that the separation claw can work stably and improving the stability of the device.

[0015] Furthermore, a positioning protrusion is provided at the position of the separation claw corresponding to the spring, and a positioning column is provided at the position of the base corresponding to the spring, and the spring is sleeved on the positioning protrusion and the positioning column; the positioning protrusion and the positioning column are used to improve the installation stability of the spring.

[0016] Furthermore, a static dissipating brush is provided on one side of the fixing roller.

[0017] The utility model has the following beneficial effects: the utility model utilizes the first arc surface to be in line contact with the fixing roller to reduce the pressure between the separation claw and the fixing roller, thereby preventing the separation claw from scratching the fixing roller; the existence of the protective gap enables the separation claw to rotate when paper is jammed, and the first arc surface and the second arc surface can be utilized to prevent the fixing roller from being scratched, thereby effectively improving the stability of the device; at the same time, the setting of the second arc surface also enables it to play a protective role regardless of any paper jam situation, thereby making the use effect of the device better and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of this embodiment;

[0020] Figure 2 for Figure 1 A magnified view of point A;

[0021] Figure 3 is a perspective view of the separation claw of this embodiment;

[0022] Figure 4 is a side view of this embodiment;

[0023] Figure 5 Schematic diagram of the base structure of this embodiment;

[0024] Figure 6 Schematic diagram of the installation of the separation claw of this embodiment;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of this embodiment. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0027] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] The utility model provides a paper separation mechanism for a fuser, such as Figure 1 and Figure 7 As shown, it includes a fixing roller 10 and a fixing film 11 that cooperate with each other, wherein the paper passes between the fixing roller 10 and the fixing film 11, and a paper separation assembly is provided on the paper output side of the fixing roller 10. The paper separation assembly is used to separate the paper attached to the fixing roller 10, so that the paper enters the next process after passing through the paper separation assembly.

[0031] Specifically, such as Figure 1 and Figure 5 As shown, the paper separation assembly includes a base 20, on which a plurality of separation claws 21 are rotatably provided, wherein the working ends of the separation claws 21 are in line contact with the surface of the fixing roller 10. When the paper adheres to the fixing roller 10 and rotates with the fixing roller 10, when passing through the separation claws 21, the separation claws 21 can poke up one side of the paper to separate the paper from the fixing roller 10, thereby transporting the paper from the upper side of the separation claws 21, and the paper that is not normally attached to the fixing roller 10 will directly pass through the separation claws 21.

[0032] like Figure 2 、 Figure 3 and Figure 4 As shown, in order to prevent the separation claw 21 from scratching the fixing roller 10 at the contact point with the fixing roller 10, the working end of the separation claw 21 includes a convex first arc surface 211, and the first arc surface 211 is tangent to the outer side surface of the fixing roller 10 to achieve line contact. Through the line contact, the contact area between the separation claw 21 and the fixing roller 10 is increased, the pressure is reduced, and the possibility of the separation claw 21 scratching the surface of the fixing roller 10 is reduced, thereby increasing the service life of the device and making the device more effective.

[0033] like Figure 1 and Figure 2 As shown, during use, two paper jam conditions may occur. The first is that the paper may bypass the separation claw 21 and enter the lower side of the separation claw 21; the second is that the paper may accumulate at the upper end of the separation claw 21 and press on the upper end of the separation claw 21. In order to prevent the separation claw 21 from scratching the surface of the fixing roller 10 when a paper jam occurs, the working end of the separation claw 21 is further provided with a convex second arc surface 212, wherein a protective gap is provided between the second arc surface 212 and the outer surface of the fixing roller 10.

[0034] When the first type of paper jam occurs, the paper is accumulated on the lower side of the separation claw 21, and the accumulated paper will support the separation claw 21. At this time, the working end of the separation claw 21 will tilt upward, so that the first arc surface 211 is separated from the separation roller 10, and then the second arc surface 212 passes by the fixing roller 10 and contacts with the fixing roller 10, and the protective gap disappears. At this time, the separation claw 21 can no longer continue to rotate, which plays a certain limiting effect, preventing the separation claw 21 from rotating upward at an excessively high angle. Since the second arc surface 212 and the fixing roller 10 are also in line contact, the separation claw 21 can be prevented from scratching the surface of the fixing roller 10, thereby improving the use effect of the device and making the device more stable and reliable to use.

[0035] When the second type of paper jam occurs, paper piles up above the separation claw 21, causing the working end of the separation claw 21 to press against the fixing roller 10. As the weight of the paper reaches a certain level, the first curved surface 211 presses the surface of the fixing roller 10 to cause it to deform, and the corresponding protective gap between the second curved surface 212 and the fixing roller 10 is reduced. When the squeezing reaches a certain level, the second curved surface 212 contacts the surface of the fixing roller 10. Since the second curved surface 212 contacts the fixing roller 10, there are two line contacts to disperse the pressure, ensuring that the fixing roller 10 is not scratched by the separation claw 21.

[0036] In order to make the working end structure of the separation claw 21 more suitable, a transition surface 213 is provided between the first arc surface 211 and the second arc surface 212, wherein the transition surface 213 is a concave arc surface, and the size of the protective gap between the second arc surface 212 and the fixing roller 10 is between 0.02 and 0.04 mm, and the preferred protective gap size is 0.03 mm.

[0037] The separation claw 21 is produced by injection molding of ultra-high temperature resistant material and sprayed with a layer of fluorine coating on the surface, so that it has higher reliability and good non-stick properties in high temperature working environment, reducing the number of cleaning times during use.

[0038] like Figure 5 and Figure 6As shown, in order to facilitate the installation of the separation claw 21, a mounting plate 22 is provided on the base 20 on one side corresponding to the separation claw 21, and a penetrating rotating shaft 23 is provided on the separation claw 21, wherein the rotating shaft 23 is rotatably connected to the mounting plate 22, and an L-shaped bracket 24 is installed on the other side of the base 20 corresponding to the separation claw 21, and the rotating shaft 23 is rotatably connected to the L-shaped bracket 24.

[0039] In order to facilitate the installation of the L-shaped bracket 24 on the base 20, a positioning hole is opened on the L-shaped bracket 24, and an adaptive positioning pin 25 is set at the position corresponding to the positioning hole on the base 20, and the L-shaped bracket 24 is installed on the base 20 by bolts.

[0040] In order to ensure that the first arc surface 211 of the separation claw 21 is stably tangent to the fixing roller 10 , a spring 26 is provided between the separation claw 21 and the base 20 . Under the action of the spring 26 , the first arc surface 211 tends to be closely attached to the fixing roller 10 .

[0041] A positioning protrusion 27 is provided at the position of the separation claw 21 corresponding to the spring 26, and a positioning column 28 is provided at the position of the base 20 corresponding to the spring 26, wherein the spring 26 is sleeved on the positioning protrusion 27 and the positioning column 28, making the installation of the spring 26 more stable.

[0042] like Figure 1 As shown, a dissipative brush 12 is provided on one side of the fixing roller 10 , and the dissipative brush 12 is used to eliminate static electricity on the fixing roller 10 to prevent paper from easily adhering to the fixing roller 10 .

[0043] It should be understood that the above description of the specific embodiments of the present invention is merely for the purpose of illustrating the technical approach and features of the present invention. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, the present invention is not limited to the above-described specific embodiments. Any changes or modifications made within the scope of the claims of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A paper separation mechanism for a fuser, characterized in that: The invention comprises a fixing roller (10), a paper separation assembly is provided on one side of the fixing roller (10), and the paper separation assembly comprises a base (20). A plurality of separation claws (21) are rotatably mounted on the base (20), and a first arc surface (211) tangent to the outer side surface of the fixing roller (10) is provided at the working end of the separation claw (21), and a second arc surface (212) is further provided at the working end of the separation claw (21), and a protective gap exists between the second arc surface (212) and the outer side surface of the fixing roller (10).

2. The paper separation mechanism of the fuser according to claim 1, characterized in that: A smooth tangent transition surface (213) is provided between the first arc surface (211) and the second arc surface (212).

3. The paper separation mechanism of the fuser according to claim 2, characterized in that: The transition surface (213) is a concave smooth surface.

4. The paper separation mechanism of the fuser according to claim 1, characterized in that: The size of the protection gap is 0.02-0.04 mm.

5. The paper separation mechanism of the fuser according to claim 1, characterized in that: The separation claw (21) is integrally formed of an ultra-high temperature-resistant material and has a layer of fluorine coating sprayed on its surface.

6. The paper separation mechanism of the fuser according to claim 1, characterized in that: A rotating shaft (23) is provided on the separation claw (21); a mounting plate (22) is provided on one side of the base (20) corresponding to the separation claw (21); and an L-shaped bracket (24) is provided on the other side; the rotating shaft (23) is rotatably connected to the mounting plate (22) and the L-shaped bracket (24).

7. The paper separation mechanism of the fuser according to claim 6, characterized in that: A positioning hole is provided on the L-shaped bracket (24), and a positioning pin (25) is provided on the base (20) at a position corresponding to the positioning hole.

8. The paper separation mechanism of the fuser according to claim 1, characterized in that: A spring (26) is provided between the separation claw (21) and the base (20).

9. The paper separation mechanism of the fuser according to claim 8, characterized in that: The separation claw (21) is provided with a positioning protrusion (27) at a position corresponding to the spring (26), the base (20) is provided with a positioning column (28) at a position corresponding to the spring (26), and the spring (26) is sleeved on the positioning protrusion (27) and the positioning column (28).

10. The paper separation mechanism of the fuser according to claim 1, characterized in that: A dissipative brush (12) is provided on one side of the fixing roller (10).

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