CN206877044U - Fixing device and image forming device - Google Patents

Abstract

The utility model provides a kind of fixing device, possesses：Fixing roller, the medium entered in fixing device is heated, will be toner fusing on medium；Heating roller, it is pressurized with interior bag, heats press belt in the state of press belt is pressed against on fixing roller, the toner of the fusing on the medium between fixing roller and heating roller is adhered to medium；Driven roller, it is pressurized with interior bag, configures in the position relative with fixing roller, can rotate and can be supported on from the side that fixing roller separates on fixing device with moving up；Mobile device, have：Cam, it can be rotationally supported on fixing device；Arm, it can be rotationally supported on fixing device, while gearing with cam contact and with the spinning movement of cam, the rotary shaft comprising driven roller；And cooling device, by the spinning movement of the cam of mobile device, arm rotation, the position movement of the rotary shaft of driven roller, when fixing roller separates with press belt, will can be cooled down in fixing device.

Description

Fixing device and image forming device

technical field

The utility model relates to the field of image formation, in particular to a fixing device in an image forming device with a decolorization function and an image forming device using the fixing device.

Background technique

Currently, in offices and the like, an image forming device (MFP: Multi-Functional Peripheral, multifunctional peripheral) is often used as office equipment. The toner image is formed on the surface of the photosensitive drum, and the toner image on the photosensitive drum is transferred to the transfer belt device, and the transfer belt device transfers the toner image to the medium, with the transferred toner image The medium is pressurized and heated by the fixing device to fix the toner image on the medium, and the fixed medium is discharged to the discharge tray.

The fixing device includes: a fixing roller having a heater lamp arranged therein; and a heating roller which is surrounded by a pressure belt, has a heater lamp arranged therein, and is arranged in a state where the pressure belt presses the fixing roller. The medium on which the toner image is transferred is conveyed between the fixing roller and the heating roller. Then, when the medium passes between the fixing roller and the heating roller, the toner image is fixed on the medium by applying heat and pressure.

In recent years, as the raw material of paper as the main medium, that is, the improvement of environmental awareness such as the protection of forest resources and the reduction of carbon dioxide emissions, for example, an image forming apparatus has appeared that combines paper recycling and The purpose of repeated use is to use a decolorable toner that decolorizes an image forming material (for example, toner) on paper for printing.

At this time, the fixing temperature for fixing the toner image on the medium in the printing mode is different from the decolorizing temperature at which the toner image is fixed on the medium using the decolorizable toner in the decolorizing mode, Specifically, it is necessary to control the fixing temperature to be lower than the decolorization temperature. Therefore, when printing again after decolorization, in order to change the temperature of the fixing device from the decolorizing temperature to the fixing temperature, it is necessary to lower the temperature of the fixing device. Currently, the method of cooling the fixing device with a cooling fan is used. However, during cooling, the pressure belt is blown to cool the fixing roller under pressure. During cooling, the heat on the side of the fixing roller is transferred to the pressure belt. Therefore, the cooling efficiency of the heating roller deteriorates, resulting in image formation. The efficiency of the device is reduced.

Utility model content

The purpose of the utility model is to provide a fixing device capable of improving cooling efficiency.

A fixing device according to an embodiment of the present invention includes:

a fixing roller, in which a heating lamp on the fixing roller side is arranged, and the heating lamp on the fixing roller side heats the medium entering the fixing device to melt the toner on the medium;

The heating roller is provided with heating roller side heater lamps inside the heating roller, and is surrounded by a pressure belt, and the pressure belt is heated in a state where the pressure belt is pressed against the fixing roller, and the pressure belt is heated. the melted toner on the medium between the fixing roller and the heating roller adheres to the medium;

a drive roller enclosed by the pressure belt, arranged at a position opposite to the fixing roller, and supported on the fixing device so as to be rotatable and movable in a direction separating from the fixing roller;

The moving device includes: a cam rotatably supported by the fixing device; an arm rotatably supported by the fixing device, contacting the cam and interlocking with the rotation of the cam, including the axis of rotation of the drive roller; and

In the cooling device, when the cam of the moving device rotates, the arm rotates, the position of the rotation shaft of the driving roller moves, and the fixing roller can be separated from the pressure belt. Cooling inside the fixing unit.

An image forming apparatus according to an embodiment of the present invention includes:

an image forming section that forms a toner image on a medium; and

a fixing device that heats both sides of the medium while applying pressure to fix the toner image on the medium,

The fixing device includes:

A fixing roller, in which a heating lamp on the fixing roller side is arranged, and the heating lamp on the fixing roller side heats the medium entering the fixing device to melt the toner on the medium;

The heating roller is provided with heating roller side heater lamps inside the heating roller, and is surrounded by a pressure belt, and the pressure belt is heated in a state where the pressure belt is pressed against the fixing roller, and the pressure belt is heated. the melted toner on the medium between the fixing roller and the heating roller adheres to the medium;

a drive roller enclosed by the pressure belt, arranged at a position opposite to the fixing roller, and supported on the fixing device so as to be rotatable and movable in a direction separating from the fixing roller;

The moving device includes: a cam rotatably supported by the fixing device; an arm rotatably supported by the fixing device, contacting the cam and interlocking with the rotation of the cam, including the axis of rotation of the drive roller; and

In the cooling device, when the cam of the moving device rotates, the arm rotates, the position of the rotation shaft of the driving roller moves, and the fixing roller can be separated from the pressure belt. Cooling inside the fixing unit.

The utility model can improve the cooling efficiency of the fixing device by combining the moving device capable of making the fixing roller and the pressure belt in a non-contact state and the cooling device cooling the fixing device, and can improve the productivity of printing by reusing the medium.

Description of drawings

FIG. 1 is a schematic diagram showing an image forming apparatus according to an embodiment of the present invention;

2 is a diagram showing an image forming unit of an image forming apparatus according to an embodiment of the present invention;

3 is a diagram showing a fixing device of an image forming apparatus according to an embodiment of the present invention;

4 is a diagram showing a moving device in a fixing device of an image forming apparatus according to an embodiment of the present invention;

FIG. 5 is a diagram showing a moving mechanism of a drive roller in the moving device shown in FIG. 4 .

detailed description

Hereinafter, embodiment of this invention is demonstrated.

FIG. 1 is a diagram showing a schematic of an image forming apparatus according to an embodiment of the present invention.

As shown in FIG. 1 , the image forming apparatus 5 is provided with a printing unit 500 , a paper tray 510 , a scanning unit 520 , an automatic supply unit 530 , and a control panel 540 .

The printing unit 500 outputs image information as an output image called, for example, copy text or printout. The paper tray 510 supplies paper of an arbitrary size for image output, that is, an output medium, to the printing section 500 . The scanner unit 520 reads image information from a document as image data. The automatic feeding unit 530 conveys the scanned document from the reading position to the discharge position, and guides the following document to the reading position. Control panel 540 is an instruction input unit for instructing operations of the image forming apparatus, such as start of image formation in printing unit 500 , start of reading image information of a document by scanner unit 520 , and the like. The control panel 540 is provided with a display unit 541 for inputting instructions and displaying information to the operator.

FIG. 2 is a diagram showing an image forming unit of an image forming apparatus according to an embodiment of the present invention.

As shown in FIG. 2 , the photosensitive drum 600 of the image forming unit 6 has an organic photosensitive body on the surface of the supporting member. The photosensitive drum 600 is driven in the arrow s direction at a certain paper conveyance speed. Around the photosensitive drum 600 , a charging charger 610 , a laser exposure device 620 , a developing device 630 , a transfer charger 640 , a stripping charger 650 , a cleaner 660 , and a static elimination LED 670 are arranged.

The charging charger 610 sequentially charges the photosensitive drum 600 with the same negative charge as the photosensitive drum 600 rotates. The laser exposure device 620 irradiates laser light to the irradiation position on the charged photosensitive drum 600 .

Paper as a recording medium is conveyed from the paper feed cassette unit 680 to the photosensitive drum 600 by being guided by the paper feed roller 690 . Synchronously with the formation of the toner image on the photosensitive drum 600 , the paper is conveyed to the position of the transfer charger 640 by being guided by the registration roller 700 . At this time, an unfixed toner image is formed on the sheet. Here, the paper feeding cassette device 680 can supply unused paper and recycled paper at the same time.

FIG. 3 is a diagram showing a fixing device of an image forming apparatus according to an embodiment of the present invention.

The fixing device 1 is arranged inside the printing unit 500 of the image forming apparatus 5 at a position close to the image forming unit 6 shown in FIG. It is enclosed and arranged in a state where the pressure belt 20 is pressed against the fixing roller 10 . The paper on which the toner image has been transferred is conveyed between the fixing roller 10 and the heating roller 40 . Then, when the paper passes between the fixing roller 10 and the heating roller 40 , the toner image is fixed on the paper by applying heat and pressure.

In addition, the driving roller 30 enclosed by the pressure belt 20 is disposed at a position facing the fixing roller 10 . The fixing roller 10 is driven to rotate by external power, and the driving roller 30 is indirectly driven to rotate by the power of the fixing roller 10 via the pressure belt 20 . The drive roller 30 is supported by a support portion in the fixing device 1 and can move in a direction to separate from the fixing roller 10 . In other words, the drive roller 30 is supported in the fixing device 1 by the support portion, and the center position of the rotation axis of the drive roller 30 is movable in a direction away from (fixed) the center position of the rotation axis of the fixing roller 10 .

A fixing roller side heating lamp 101 is arranged inside the fixing roller 10 to heat the medium entering the fixing device 1 to melt the toner on the medium. The heating roller side heating lamp 401 is disposed inside the heating roller 40 , and heats the pressure belt 20 in a state of pressing the pressure belt 20 on the fixing roller 10 , so that the melt on the medium between the fixing roller 10 and the heating roller 40 The toner sticks to the medium. In addition, as a heater lamp, a halogen lamp can be used, for example.

In addition, the fixing device 1 includes: a fixing roller side temperature detecting unit 50 that detects the temperature of the fixing roller 10 ; and a heating roller side temperature detecting unit 60 that detects the temperature of the heating roller 40 .

In addition, the fixing device 1 includes a cooling device 130 , and can cool the fixing device 1 as necessary. The cooling device 130 is, for example, a fan, and can blow air to the fixing device 1 from an oblique direction to the inside of the fixing device 1 . cool down.

The control unit of the image forming apparatus 5 executes the operation mode ( decolorizing operation mode, printing and fixing operation mode, etc.) switching of the device’s operating state), or switching of the cooling operation (ON/OFF, etc.) Switching of the lighting operation (ON/OFF, etc.) of the lamp 401 . In addition, the control unit can also control switching of lighting operations (ON/OFF, etc.) of the fixing roller side heater lamp 101 and the heating roller side heater lamp 401 according to the operation mode of the image forming apparatus 5 .

4 is a diagram illustrating a moving device in a fixing device of an image forming apparatus according to an embodiment of the present invention. FIG. 5 is a diagram showing a moving mechanism of a drive roller in the moving device shown in FIG. 4 .

The moving device 4 includes: a cam 80 fixed to a camshaft 70 rotated by power supplied from a power unit disposed on the fixing device 1; a first arm 90 rotatably supported by the base of the fixing device 1, and The rotation of the cam 80 is interlocked; the second arm 100 is rotatably connected to the first arm 90 around the fulcrum 110, and includes a drive roller shaft 301 as the rotation shaft of the drive roller 30; and the spring 91, in order to prevent The drive roller 30 moves due to its own weight, and the spring 91 is supported at one end by the base of the fixing device 1 and at the other end by the first arm 90 .

For the drive roller 30 movably supported in the fixing device 1 by the support portion, the moving device 4 having the above-mentioned structure is adopted, whereby the connecting operation of the first arm 90 and the second arm 100 in conjunction with the cam 80 can By moving the center position of the drive roller shaft 301 as the rotation shaft of the drive roller 30, the contact state (pressurized state) and the non-contact state (pressurized state) of the pressure belt 20 passing the fixing roller 10 and the drive roller 30 are realized Separate state) these two states, and can maintain this state for a certain period of time.

The rotation angle of the cam 80 is detected by a sensor such as an optical chopper, and the rotation angle of a rotation drive unit for the camshaft 70 is controlled. The contact state of the fixing roller 10 with the drive roller 30 is determined by the rotation angle of the cam 80 . In the printing and fixing operation mode of the fixing device 1 , the fixing roller 10 and the driving roller 30 are brought into contact (pressurized state). In the cooling mode for cooling the fixing device 1 , the fixing roller 10 and the drive roller 30 are in a non-contact state (separated state).

In addition, the spring 120 on the first arm 90 has an effect of canceling the effect of gravity acting on the first arm 90 in the separated state. The first arm 90 compresses the pressure spring 120 in conjunction with the rotation of the cam 80 . The second arm 100 is moved by the compression of the pressure spring 120 , and the shaft 301 of the driving roller on the second arm approaches the fixing roller 10 , thereby pressing the driving roller 30 . Here, the shaft 301 of the drive roller is rotatably fixed to the second arm 100 . When the pressure is applied, the second arm 100 rotates around the fulcrum 110 , and the shaft 301 of the driving roller moves toward the fixing roller 10 side.

In the image forming apparatus 5 having a decolorizing function, after the decolorizing process is completed, the fixing device 1 needs to be cooled to a temperature at which decolorizable toner can be printed. Generally, the decolorization temperature of the decolorable toner is 120°C or higher, and the printing temperature of the decolorable toner is about 100°C. Therefore, it is necessary to lower the temperature of the fixing device 1 by about 20°C. When cooling the fixing device 1 , the cooling target temperature for the heating roller 40 of the heating and pressing belt 20 needs to be set lower than the cooling target temperature for the fixing roller 10 in consideration of heat conduction. However, in a state where the pressure belt 20 is pressing the fixing roller 10 side, the heat on the fixing roller 10 side is conducted to the pressure belt 20 , and thus the cooling efficiency of the heating roller 40 is poor. Therefore, in the present embodiment, the moving device 4 of the fixing device 1 of the image forming apparatus 5 is operated to move the center position of the drive roller shaft 301 as the rotation shaft of the drive roller 30 , and the fixing roller 10 and the pressure belt 20 are moved together. In a non-contact (separated) state, cooling is performed using the cooling device 130 . Thus, when cooling is performed, the heat on the side of the fixing roller 10 can be prevented from being transferred to the pressure belt 20, so that the fixing roller 10, the pressure belt 20, and the heating roller 40 of the fixing device 1 can be efficiently cooled, and it is possible to reduce losses caused by energy loss. The waiting time after color processing to the start of printing. By shortening this waiting time, it is possible to improve the productivity of printing that reuses the medium.

In addition, at the time of cooling, whether the temperature of the fixing roller 10 reaches the cooling target temperature for the fixing roller 10, or whether the temperature of the external heating roller 40 reaches the cooling target temperature for the heating roller 40 is determined by using the fixing roller side temperature detection part 50 respectively. and the heating roller side temperature detecting unit 60 to perform temperature monitoring, and when the temperature of both the fixing roller 10 and the heating roller 40 reaches the cooling target temperature, the control unit in the image forming apparatus 5 controls the camshaft 70 so that the cam 80 Rotate, thus, move the moving device 4, move the position of the rotation axis of the driving roller 30 to the direction close to the fixing roller 10, release the separation (non-contact) state of the fixing roller 10 and the pressure belt 20, and perform the operation again based on The pressure of the pressure belt 20 is used to perform reprinting after the decolorization process.

In addition, in recent years, multifunctional image forming apparatuses capable of handling both decolorizable toners and non-decolorizable toners have appeared. In such a multifunctional image forming apparatus, in the printing and fixing mode using a non-decolorable toner, it is necessary to increase the fixing temperature target of the printing and fixing process compared to the printing and fixing mode using a decolorizable toner. temperature. Especially when printing on special media such as thick paper and envelopes, it is necessary to make the fixing device 1 a higher temperature (about 140° C. to 180° C.) than usual. In the cooling after the high-temperature printing and fixing mode of such a special medium, in the fixing device 1 of the image forming apparatus 5, the moving device 4 is operated by using the moving device 4 shown in FIGS. By moving the center position of the drive roller shaft 301 which is the rotation shaft of the drive roller 30, cooling is performed using the cooling device 130 under the non-contact (separation) condition of the pressure belt 20 with respect to the fixing roller 10, whereby cooling can be improved. Efficiency, the waiting time for cooling can be shortened, and the productivity of printing on reused media can be improved.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the present invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, combinations, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the present invention, and are included in the present invention described in the claims and its equivalent scope.

Claims (10)

1. A fixing device, characterized in that: a fixing roller, in which a heating lamp on the fixing roller side is arranged, and the heating lamp on the fixing roller side heats the medium entering the fixing device to melt the toner on the medium; The heating roller is provided with heating roller side heater lamps inside the heating roller, and is surrounded by a pressure belt, and the pressure belt is heated in a state where the pressure belt is pressed against the fixing roller, and the pressure belt is heated. the melted toner on the medium between the fixing roller and the heating roller adheres to the medium; a drive roller enclosed by the pressure belt, arranged at a position opposite to the fixing roller, and supported on the fixing device so as to be rotatable and movable in a direction separating from the fixing roller; The moving device includes: a cam rotatably supported by the fixing device; an arm rotatably supported by the fixing device, contacting the cam and interlocking with the rotation of the cam, including the axis of rotation of the drive roller; and In the cooling device, when the cam of the moving device rotates, the arm rotates, the position of the rotation shaft of the driving roller moves, and the fixing roller can be separated from the pressure belt. Cooling inside the fixing unit. 2. The fixing device according to claim 1, wherein: The arm has: a first arm rotatably supported on the fixing device, in contact with the cam, and interlocked with the rotation of the cam; The second arm is rotatably connected to the first arm with a fulcrum as a center, and includes a rotation shaft of the drive roller; and The spring is arranged on the first arm and transmits pressing force based on the rotation of the first arm to the second arm. 3. The fixing device according to claim 1, further comprising: The fixing roller side temperature detecting unit detects whether the temperature of the fixing roller reaches a preset target temperature while detecting the temperature of the fixing roller; and The temperature detection unit on the heating roller side detects whether the temperature of the heating roller reaches a preset target temperature while detecting the temperature of the heating roller. 4. The fixing device according to claim 3, wherein: After detecting that the fixing roller-side temperature detecting unit and the heating roller-side temperature detecting unit have reached the target temperature, the moving device rotates the arm by rotating the cam so that the rotating shaft of the driving roller The position of the fixing roller moves toward the fixing roller, the separation of the fixing roller and the pressure belt is released, and the pressure state by the pressure belt is restored again. 5. The fixing device according to claim 4, wherein: The target temperature is a different value when a decolorizable toner is used as the toner and when a non-decolorizable toner is used. 6. An image forming device, comprising: an image forming section that forms a toner image on a medium; and a fixing device that heats both sides of the medium while applying pressure to fix the toner image on the medium, The fixing device includes: A fixing roller, in which a heating lamp on the fixing roller side is arranged, and the heating lamp on the fixing roller side heats the medium entering the fixing device to melt the toner on the medium; The heating roller is provided with heating roller side heater lamps inside the heating roller, and is surrounded by a pressure belt, and the pressure belt is heated in a state where the pressure belt is pressed against the fixing roller, and the pressure belt is heated. the melted toner on the medium between the fixing roller and the heating roller adheres to the medium; a drive roller enclosed by the pressure belt, arranged at a position opposite to the fixing roller, and supported on the fixing device so as to be rotatable and movable in a direction separating from the fixing roller; The moving device includes: a cam rotatably supported by the fixing device; an arm rotatably supported by the fixing device, contacting the cam and interlocking with the rotation of the cam, including the axis of rotation of the drive roller; and In the cooling device, when the cam of the moving device rotates, the arm rotates, the position of the rotation shaft of the driving roller moves, and the fixing roller can be separated from the pressure belt. Cooling inside the fixing unit. 7. The image forming apparatus according to claim 6, wherein: The arm has: a first arm rotatably supported on the fixing device, in contact with the cam, and interlocked with the rotation of the cam; The second arm is rotatably connected to the first arm with a fulcrum as a center, and includes a rotation shaft of the drive roller; and The spring is arranged on the first arm and transmits pressing force based on the rotation of the first arm to the second arm. 8. The image forming apparatus according to claim 6, further comprising: The fixing roller side temperature detecting unit detects whether the temperature of the fixing roller reaches a preset target temperature while detecting the temperature of the fixing roller; and The temperature detection unit on the heating roller side detects whether the temperature of the heating roller reaches a preset target temperature while detecting the temperature of the heating roller. 9. The image forming apparatus according to claim 8, wherein: After detecting that the fixing roller-side temperature detecting unit and the heating roller-side temperature detecting unit have reached the target temperature, the moving device rotates the arm by rotating the cam so that the rotating shaft of the driving roller The position of the fixing roller moves toward the fixing roller, the separation of the fixing roller and the pressure belt is released, and the pressure state by the pressure belt is restored again. 10. The image forming apparatus according to claim 9, wherein: The target temperature is a different value when a decolorizable toner is used as the toner and when a non-decolorizable toner is used.