Fixing mechanism with long service life

Abstract

The utility model discloses a fixing mechanism with long service life, which comprises a heating roller and a pressure roller, the heating roller is positioned above the pressure roller, the pressure roller comprises a rotating shaft, a filling layer and a conductive fluorine sleeve which are sequentially arranged from inside to outside, the heating roller comprises an upper clamping sleeve, a mounting sleeve and a fixing film, the mounting sleeve is arranged below the upper clamping sleeve, and the fixing film is arranged below the mounting sleeve. The fixing film wraps the periphery of the upper clamping sleeve and the mounting sleeve, a fixing groove is formed in the center of the top face of the upper clamping sleeve, a ceramic chip and an aluminum gasket are arranged in the fixing groove, a temperature sensing resistor and a fuse are arranged between the upper clamping sleeve and the mounting sleeve, the ceramic chip is electrically connected with an electric chuck through an electrode plate, and the electric chuck is electrically connected with the fuse. And the electric chuck and the temperature sensing resistor are electrically connected with a temperature control module of the printer. According to the fixing mechanism with the long service life, the reliability of the fixing mechanism is enhanced by changing the heating roller structure and the fuse fixing structure, and the service life of the fixing mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of laser printers and copiers, in particular to a long-life fixing mechanism. Background Art

[0002] The fixing mechanism is the core component of printers and copiers, and generally includes a heating roller and a pressure roller. The pressure roller squeezes the paper to provide power for the paper to pass through the fixing mechanism. The heating roller heats the toner attached to the printing paper, causing it to melt and penetrate into the paper fibers to form text and patterns.

[0003] The heating temperature of the fixing mechanism determines the speed at which the toner melts, and thus determines the paper output speed. The heating temperature depends on the performance of the ceramic sheet in the heating roller. When the ceramic sheet is powered on, the internal resistor wire heats up. In current ceramic sheets, the resistance value of the resistor wire is unevenly distributed in each section, resulting in uneven temperature distribution of the ceramic sheet. Under the effect of thermal expansion and contraction, the fixing film will gradually shift to one side of the heating roller, causing the edge of the fixing film to break and need to be replaced. This will cause damage to the fixing film, affect the service life of the fixing component, and increase the cost of use.

[0004] In addition, a fuse is generally provided in the heating roller to ensure circuit safety. Figure 1 As shown, the existing fuse fixing structure is provided with springs 64 at both ends, and the position of the fixing structure is maintained by the elastic force between the springs 64 and the mounting sleeve 32. However, when the heating roller is repaired and disassembled, it is easy to install it incorrectly during the reinstallation process, causing the fuse to fail, resulting in pressure deviation on both sides of the fixing mechanism, and the fixing film deviates, thereby shortening the life of the fixing film. Utility Model Content

[0005] The utility model aims to provide a long-life fixing mechanism, which can enhance its reliability and prolong the life of the fixing mechanism by changing the heating roller structure and the fuse fixing structure.

[0006] To achieve the above-mentioned purpose, the utility model provides a long-life fixing mechanism, including a heating roller and a pressure roller, the heating roller is located above the pressure roller, the pressure roller includes a rotating shaft, a filling layer and a conductive fluorine sleeve arranged in sequence from the inside to the outside, the heating roller includes an upper jacket, a mounting sleeve and a fixing film, the mounting sleeve is installed below the upper jacket, the fixing film is wrapped around the upper jacket and the mounting sleeve, a fixing groove is arranged in the center of the top surface of the upper jacket, a ceramic sheet and an aluminum gasket are arranged in the fixing groove, a temperature-sensitive resistor and a fuse are arranged between the upper jacket and the mounting sleeve, fixing heads are arranged at both ends of the upper jacket, the ceramic sheet is electrically connected to an electric chuck through an electrode sheet, the electric chuck is clamped at one end of the ceramic sheet, the electric chuck is electrically connected to the fuse, and the electric chuck and the temperature-sensitive resistor are electrically connected to the temperature control module of the printer.

[0007] Preferably, the ceramic sheet is disposed above the aluminum gasket, a resistance wire is arranged inside the ceramic sheet, the resistance wire is distributed in a serpentine shape, the resistance wire is close to the edge of the ceramic sheet, and both ends of the resistance wire are electrically connected to the two electrode sheets respectively.

[0008] Preferably, a first mounting groove and a second mounting groove are respectively provided on the bottom surface of the fixing groove, the temperature sensing resistor is provided in the first mounting groove, the fuse is provided in the second mounting groove, and the temperature sensing resistor and the fuse are in contact with the aluminum gasket.

[0009] Preferably, the bottom of the temperature-sensing resistor is arranged in the first fixing part, and a fixing plate is arranged at one end of the first fixing part, and the fixing plate is close to the bottom surface of the upper jacket, and two through holes are arranged on the fixing plate, and a positioning column and a fixing column are respectively arranged in the two through holes, and the positioning column and the fixing column are integrally connected with the mounting sleeve, and a plurality of convex ridges are arranged on the surface of the fixing column, and a retaining spring sheet is arranged outside the fixing column, and the retaining spring sheet is composed of a plurality of triangular blocks connected in series, and the outer edge of the retaining spring sheet is circular.

[0010] Preferably, the bottom of the fuse is arranged in the second fixing member, and positioning plates are respectively arranged at both ends of the second fixing member, the positioning plates are close to the bottom surface of the mounting sleeve, a through hole is arranged on the positioning plate, and the other two fixing columns pass through the through hole, and the retaining spring sheet is arranged outside the fixing column.

[0011] Preferably, a plurality of fixing claws are provided on both sides of the bottom surface of the upper jacket, two parallel partitions are provided on the bottom surface of the mounting sleeve, two ends of the mounting sleeve are inserted between the fixing claws and the partitions, and the first fixing member and the second fixing member are both provided between the partitions.

[0012] Therefore, the utility model adopts a long-life fixing mechanism of the above structure, and makes the temperature distribution of the entire ceramic sheet uniform by adjusting the position of the resistance wire in the ceramic sheet, thereby reducing the probability of damage to the fixing film and extending the service life of the fixing mechanism. The temperature-sensitive resistor is fixed by the first fixing member, the fuse is fixed by the second fixing member, and the first fixing member and the second fixing member are fixed by the fixing column and the clip spring sheet, so as to keep the structure tight and avoid improper installation during reinstallation.

[0013] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the existing fuse fixing structure;

[0015] Figure 2It is a structural schematic diagram of an embodiment of a long-life fixing mechanism of the utility model;

[0016] Figure 3 This is a schematic diagram of the circuit connection principle of an embodiment of the utility model;

[0017] Figure 4 This is a schematic diagram of the top surface structure of the upper jacket of an embodiment of the utility model;

[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the upper jacket of an embodiment of the utility model;

[0019] Figure 6 This is a schematic diagram of the bottom surface structure of the upper jacket of an embodiment of the utility model;

[0020] Figure 7 This is a schematic diagram of the ceramic sheet structure of an embodiment of the utility model.

[0021] Reference numerals

[0022] 1. Paper; 2. Pressure roller; 21. Conductive fluorine sleeve; 22. Rotating shaft; 23. Filling layer; 3. Upper jacket; 31. Fixing claw; 32. Mounting sleeve; 33. Partition plate; 34. Aluminum gasket; 35. Ceramic sheet; 36. Resistance wire; 37. Electrode sheet; 38. Fixing groove; 4. Fixing head; 41. Electric chuck; 42. Fixing film; 5. Temperature-sensitive resistor; 51. First fixing piece; 52. Positioning column; 53. Fixing plate; 54. First mounting groove; 6. Fuse; 61. Second mounting groove; 62. Positioning plate; 63. Second fixing piece; 64. Spring; 7. Reed sheet; 71. Fixing column; 72. Convex ridge. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0024] Example

[0025] As shown in the figure, a long-life fixing mechanism includes a heating roller and a pressure roller 2, wherein the heating roller is located above the pressure roller 2, and the paper 1 passes between the pressure roller 2 and the heating roller. The pressure roller 2 includes a rotating shaft 22, a filling layer 23, and a conductive fluorine sleeve 21 which are arranged in sequence from the inside to the outside. The conductive fluorine sleeve 21 is conductive and is made by doping conductive materials to enhance the conductive performance of the pressure roller 2.

[0026] The heating roller comprises an upper jacket 3 , a mounting sleeve 32 and a fixing film 42 . The mounting sleeve 32 is mounted below the upper jacket 3 , and the fixing film 42 is wrapped around the upper jacket 3 and the mounting sleeve 32 .

[0027] Doping a certain proportion of conductive material in the fixing film 42 can reduce resistance, enhance conductivity, generate static electricity, and prevent carbon powder from being adsorbed on the fixing mechanism rather than the surface of the paper. However, the doping of conductive materials will cause the material of the fixing film 42 to become brittle, making the fixing film 42 prone to wrinkles and pressure damage. Based on the conductivity of the conductive fluorine sleeve 21, the proportion of conductive carbon black doped in the fixing film 42 can be appropriately reduced from 1% to 0.05%. Although the resistance of the fixing film 42 will increase from 10-15Ω to 150-300Ω, the tear resistance is greatly enhanced. Its service life is extended from being able to withstand 20,000 sheets of paper printing to being able to withstand 100,000 sheets of paper printing, which greatly reduces the loss of the fixing film 42. The conductivity of the conductive fluorine sleeve 21 and the fixing film 42 is comprehensive and complementary, and will not affect the anti-adsorption effect of carbon powder on the paper 1, and can also extend the service life of the fixing film 42.

[0028] A plurality of fixing claws 31 are arranged on both sides of the bottom surface of the upper jacket 3, and two parallel partitions 33 are arranged on the bottom surface of the installation sleeve 32, and the two ends of the installation sleeve 32 are inserted between the fixing claws 31 and the partitions 33. A fixing groove 38 is arranged in the center of the top surface of the upper jacket 3, and a ceramic sheet 35 and an aluminum gasket 34 are arranged in the fixing groove 38. The ceramic sheet 35 is arranged above the aluminum gasket 34. A temperature-sensitive resistor 5 and a fuse 6 are arranged between the upper jacket 3 and the installation sleeve 32, and the temperature-sensitive resistor 5 and the fuse 6 are in contact with the aluminum gasket 34. A resistance wire 36 is arranged in the ceramic sheet 35, and the resistance wire 36 is close to the edge of the ceramic sheet 35. The two ends of the resistance wire 36 are electrically connected to two electrode sheets 37 respectively. The ceramic sheet 35 is electrically connected to the electric chuck 41 through the electrode sheet 37. The electric chuck 41 is clamped at one end of the ceramic sheet 35, and the electric chuck 41 is electrically connected to the fuse 6. The electric chuck 41 and the temperature-sensitive resistor 5 are electrically connected to the temperature control module of the printer. The resistance wire 36 is distributed in a serpentine shape in the ceramic sheet 35 , and the edge of the resistance wire 36 is close to the edge of the ceramic sheet 35 , so that the entire ceramic sheet 35 is heated evenly, thereby preventing the fixing film 42 from being deflected due to uneven heating.

[0029] The temperature control module supplies power to the resistance wire 36 in the ceramic sheet 35 through the electric chuck 41 via the electrode sheet 37, and the resistance wire 36 is heated by over-powering. The aluminum gasket 34, as a good heat conductor, can keep the heat distribution of the ceramic sheet 35 uniform, and at the same time, the aluminum gasket 34 transfers the temperature to the temperature-sensing resistor 5 and the fuse 6. Since the aluminum gasket 34 can evenly transfer the temperature of the entire ceramic sheet 35, the accuracy of the temperature-sensing resistor 5 in sensing temperature can be enhanced. The temperature-sensing resistor 5, as a feedback structure for temperature control, provides temperature information to the temperature control module to keep the temperature of the ceramic sheet 35 within a certain threshold. The fuse 6 is a safety measure, and it will melt when the temperature is too high or the current is too large to prevent the resistance wire 36 from burning.

[0030] The upper jacket 3 is provided with fixing heads 4 at both ends, which are used to fix the heating roller in the printer. The bottom surface of the fixing groove 38 is provided with a first mounting groove 54 and a second mounting groove 61, respectively. The temperature-sensitive resistor 5 is provided in the first mounting groove 54, and the bottom of the temperature-sensitive resistor 5 is provided in the first fixing member 51. A fixing plate 53 is provided at one end of the first fixing member 51. The fixing plate 53 is close to the bottom surface of the upper jacket 3. The fixing plate 53 is provided with two through holes, and the positioning column 52 and the fixing column 71 are respectively passed through the two through holes. The positioning column 52 and the fixing column 71 are integrally connected with the mounting sleeve 32. The wire of the temperature-sensitive resistor 5 passes through the left side wall of the first fixing member 51, extends from the left side of the heating roller, and is electrically connected to the temperature control module of the printer.

[0031] The fuse 6 is arranged in the second mounting groove 61, and the bottom of the fuse 6 is arranged in the second fixing member 63. The first fixing member 51 and the second fixing member 63 are both arranged between the two partitions 33. The wire of the fuse 6 passes through the right side wall of the second fixing member 63, extends from the right side of the heating roller, and is connected to the electric clamp 41. Positioning plates 62 are respectively arranged at both ends of the second fixing member 63. The positioning plates 62 are close to the bottom surface of the mounting sleeve 32. A through hole is arranged on the positioning plate 62. The other two fixing columns 71 pass through the through hole. The surface of the fixing column 71 is provided with a plurality of convex ridges 72. A clip spring 7 is arranged outside the fixing column 71. The outer edge of the clip spring 7 is circular. The clip spring 7 is composed of a plurality of triangular blocks. The fixing column 71 passes through the central gap of the clip spring 7. The tip of the triangular block is blocked by the convex ridge 72, so that the clip spring 7 can be unidirectionally clamped at different positions of the fixing column 71 and cannot retreat, thereby fixing the second fixing member 63 on the back of the mounting sleeve 32.

[0032] The upper jacket 3, the first fixing member 51, the second fixing member 63, the fixing head 4 and the like are all made of plastic material, and the mounting sleeve 32 and the rotating shaft 22 are made of alloy material.

[0033] Therefore, the utility model adopts a long-life fixing mechanism of the above structure, which is equipped with a fixing film with a reduced conductive carbon black doping ratio on the basis of using a conductive fluorine sleeve, so as to enhance the tear resistance of the fixing film; the temperature distribution of the entire ceramic sheet is uniform by adjusting the position of the resistance wire in the ceramic sheet, thereby reducing the probability of damage to the fixing film and extending the service life of the fixing mechanism; the temperature sensing resistor is fixed by the first fixing member, the fuse is fixed by the second fixing member, and the first fixing member and the second fixing member are fixed by a fixing column and a spring plate, so as to keep the structure tight and avoid improper installation during reinstallation.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A long-life fixing mechanism, characterized in that: It includes a heating roller and a pressure roller, the heating roller is located above the pressure roller, the pressure roller includes a rotating shaft, a filling layer and a conductive fluorine sleeve arranged in sequence from the inside to the outside, the heating roller includes an upper jacket, a mounting sleeve and a fixing film, the mounting sleeve is installed below the upper jacket, the fixing film is wrapped around the upper jacket and the mounting sleeve, a fixing groove is arranged in the center of the top surface of the upper jacket, a ceramic sheet and an aluminum gasket are arranged in the fixing groove, a temperature-sensitive resistor and a fuse are arranged between the upper jacket and the mounting sleeve, fixed heads are arranged at both ends of the upper jacket, the ceramic sheet is electrically connected to an electric chuck through an electrode sheet, the electric chuck is clamped at one end of the ceramic sheet, the electric chuck is electrically connected to the fuse, and the electric chuck and the temperature-sensitive resistor are electrically connected to the temperature control module of the printer.

2. A long-life fixing mechanism according to claim 1, characterized in that: The ceramic sheet is arranged above the aluminum gasket, a resistance wire is arranged inside the ceramic sheet, the resistance wire is distributed in a serpentine shape, the resistance wire is close to the edge of the ceramic sheet, and both ends of the resistance wire are electrically connected to the two electrode sheets respectively.

3. A long-life fixing mechanism according to claim 2, characterized in that: A first mounting groove and a second mounting groove are respectively arranged on the bottom surface of the fixing groove, the temperature sensing resistor is arranged in the first mounting groove, the fuse is arranged in the second mounting groove, and the temperature sensing resistor and the fuse are in contact with the aluminum gasket.

4. A long-life fixing mechanism according to claim 3, characterized in that: The bottom of the temperature-sensing resistor is arranged in the first fixing part, and a fixing plate is arranged at one end of the first fixing part. The fixing plate is close to the bottom surface of the upper jacket, and two through holes are arranged on the fixing plate. A positioning column and a fixing column are respectively arranged in the two through holes. The positioning column and the fixing column are both integrally connected with the mounting sleeve, and a plurality of convex ridges are arranged on the surface of the fixing column. A retaining spring sheet is arranged outside the fixing column, and the retaining spring sheet is composed of a plurality of triangular blocks connected in series, and the outer edge of the retaining spring sheet is circular.

5. A long-life fixing mechanism according to claim 4, characterized in that: The bottom of the fuse is arranged in the second fixing member, and positioning plates are respectively arranged at both ends of the second fixing member. The positioning plates are close to the bottom surface of the mounting sleeve, and a through hole is arranged on the positioning plate. The other two fixing columns pass through the through hole, and the retaining spring sheet is arranged outside the fixing column.

6. A long-life fixing mechanism according to claim 5, characterized in that: A plurality of fixing claws are arranged on both sides of the bottom surface of the upper jacket, two parallel partitions are arranged on the bottom surface of the installation sleeve, two ends of the installation sleeve are inserted between the fixing claws and the partitions, and the first fixing member and the second fixing member are both arranged between the partitions.

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