JPH05313537A - Image forming device - Google Patents

Abstract

PURPOSE:To selectively form color images on one surface or both surfaces of a transfer material whose both surfaces are copied, as a glossy image by setting one of first and second speeds for fixing the toner image slow. CONSTITUTION:This color image forming device is composed of an ADF device 10, each unit of an image reading system A and a laser writing system B, an image forming part C, and a paper feeding part D, in order from the upper part. When the first surface of a both side document 2 in both-side copying has a nonglossy image, it is stored together with a read image in memory, and when the fact that the second surface has the glossy image is detected, it is stored together with the read image in the memory. Then, the ADF device 10 is changed over so as to open a path for reversing and, simultaneously, the reversing/carrying path 65 of the color image forming device is changed over as well. Then, for instance, the fixing speed of 30mm/sec is set and the glossy image is formed in the first fixing. Then, for instance, the fixing speed is changed over to 120mm/sec, and the nonglossy image can be fixed in the second fixing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image forming apparatus for transferring and fixing a toner image formed on an image carrier by an electrophotographic method on a transfer material, and particularly for forming a glossy image at the time of double-sided copying. The present invention relates to a color image forming apparatus such as a copying machine or a printer including the fixing unit.

[0002]

2. Description of the Related Art Conventionally, when one or both sides of a color image formed on both sides of a transfer material by a color image forming apparatus is used as a glossy image, the fixing condition is changed and the color toner image is fixed each time.

As a method of changing the fixing condition, there are a method of changing the fixing temperature and a method of changing the fixing speed. In the former method of changing the fixing temperature, it takes time for the temperature to reach a predetermined temperature, and an offset due to the temperature change is apt to occur. Furthermore, the color reproducibility is insufficient only by increasing the temperature. Etc. have problems. On the other hand, in the latter method of changing the fixing speed, the distance from the transfer unit to the fixing unit needs to be longer than that of the transfer material, and the rear end of the front transfer material and the front end of the rear transfer material at the time of continuous image formation. There is a problem that the fixing speed can be slowed only to the extent that they do not overlap.

In any case, a color image having excellent color reproducibility cannot be obtained by image formation by the method of changing the fixing temperature or the fixing speed.

In consideration of such a problem, the applicant of the present invention discloses in Japanese Patent Laid-Open No. 2-141767 that the transfer material which has been once fixed is conveyed by the transfer material conveying means to be fixed again and is fixed again. , An image forming apparatus capable of obtaining a color image having excellent color reproducibility is proposed.

[0006]

However, in the image forming apparatus disclosed in the above publication, after the transfer material which has once been fixed is conveyed to the re-fixing conveyance path by the guide claw,
Since the fixing is performed again by the fixing means, the structure of the conveying path is complicated, and the apparatus also has to be upsized.

The present invention solves the above-mentioned problems, and in particular, an image provided with a fixing unit capable of selectively converting a color image on one side or both sides of a transfer material copied on both sides into a gloss image. An object is to provide a forming apparatus.

[0008]

The object of the present invention is to provide a toner image transferred on one surface of a transfer material in an image forming apparatus for transferring and fixing a toner image formed on an image carrier on a transfer material. A step of fixing at a speed and a step of fixing the toner image on the other surface of the transfer material again at a second speed. Either one of the second speed and the first speed is set to a slow speed. This is achieved by an image forming apparatus characterized by setting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is a side sectional view showing the configuration of a color image forming apparatus equipped with the ADF device of FIG. 1 and A of FIG.
3 is a side sectional view showing the structure of the DF device, a side sectional view showing the structure of the fixing device shown in FIG. 3, a view showing a heating temperature control circuit shown in FIG. 4, and an explanatory view showing the operating state of each member of the fixing device shown in FIG. FIG. 6 is a block diagram showing a control circuit of a color image forming apparatus equipped with the ADF device, FIG. 7 is a chart showing fixing of the image glossiness with respect to the image glossiness, and operation states of respective mechanism parts, and FIG. Will be described with reference to FIG. However, the present invention is not limited to this embodiment.

As shown in FIG. 1, a color image forming apparatus 1 comprises an ADF device 10, an image reading system of A, a laser writing system unit of B, an image forming section of C and a sheet feeding section of D in order from the top. Transfer material 6 composed by the following process
A color image is formed on.

First, in the reading system A, the document 2 conveyed from the ADF device 10 onto the platen glass 11 of the document table is illuminated by a halogen lamp 13 attached to a carriage 12 which slides in the horizontal direction. Mirrors 16 and 17 are attached to the movable mirror unit 15, and slide in the same horizontal direction, and in combination with the mirror 14 attached to the carriage 12, the optical image of the original is sent to the image reading unit 20. Derive. Below the platen glass, a photo interrupter 11A for detecting the image glossiness of the original 2 is provided.

The carriage 12 and the movable mirror unit 15 are driven via wires (not shown) connected to a stepping motor, and V and 1/1, respectively.
It is slid in the same direction at a speed of 2V.

The image reading section 20 has a lens 21 and a color CCD 22 at an image forming position behind the lens 21. Color CC
D22 is used for color separation when reading a document on the document table 11, and is composed of a 3-line CCD having a filter for passing red light, green light and blue light. The color signals color-corrected according to the colors of the toners of yellow (Y) magenta (M) cyan (C) black (B) are input to the laser writing system unit B which is an exposing unit.

In the laser writing system unit B, the laser beam generated by the semiconductor laser (not shown) is
An image carrier that is rotationally scanned by a polygon mirror 52 rotated by a drive motor 51, has its optical path bent by a mirror 54 via an fθ lens 53, and is uniformly charged to a predetermined charge by a charger 55 that is a charging unit in advance. Is formed on the peripheral surface of the photosensitive drum 30 to form a bright line.

On the other hand, the photosensitive drum 30 in the sub-scanning direction
A photo sensor (neither of which is shown) detects an index provided at a specific position, and the semiconductor laser is started to be modulated by the image signal based on the detection signal to determine the main scanning direction. When scanning is started, a laser beam is detected by an index sensor (neither is shown) in the main scanning direction, and the modulated laser beam scans the peripheral surface of the photosensitive drum 30. Therefore, the latent image corresponding to the first color is formed on the peripheral surface of the photoconductor drum 30 by the main scanning by the laser beam and the sub-scanning by the rotation of the photoconductor drum 30. In the present embodiment, this latent image is developed by a developing device 31Y containing, for example, yellow (Y) toner (visual medium) among a plurality of developing means provided in parallel, and the surface of the photosensitive drum 30 is developed. A Y toner image is formed on. The obtained toner image, while being held on the photoconductor drum 30, passes under the cleaning device 59, which is a cleaning means separated from the peripheral surface of the photoconductor drum 30, and continues to copy the second color. Enter the cycle.

That is, the photosensitive drum 30 on which the Y toner image is formed is charged again by the charger 55, and then the second color signal output from the reading system A is input to the writing system unit B. Writing to the surface of the photosensitive drum 30 is performed in the same manner as in the case of the above-described first color signal, and a latent image is formed. The latent image is developed by the developing device 31M containing, for example, magenta (M) toner as the second color. The M toner image is formed in the presence of the previously formed Y toner image.

Similarly, the latent image formed by the third image signal is developed by the developing device 31C containing cyan (C) toner, and after recharging, the latent image formed by the fourth image signal is black ( B) Development is performed by the developing device 31B containing the toner, and the C toner image and the B toner image are superposed on the peripheral surface of the photosensitive drum 30, and a color toner image is formed on the surface of the photosensitive drum 30.

An AC or even DC bias is applied to the sleeves of the developing devices 31Y, 31M, 31C, 31B, and the reversal development (jumping development) is performed in a non-contact manner on the photosensitive drum 30 whose base is grounded. It is supposed to be. For developing devices that are not related to development, stop the rotation of the developing sleeve and cut the applied bias.
The toner image formed on the photoconductor drum 30 is prevented from being damaged, and unnecessary toner is not supplied to the latent image.

The color toner image formed on the peripheral surface of the photosensitive drum 30 as described above is supplied from the paper supply section D by the paper supply belt at the transfer pole 56 provided as a transfer means, and is transferred by the timing roller. The color toner image is transferred onto a transfer material 6 which is a recording medium at the same timing. This transfer is performed by applying a high voltage power source having a polarity opposite to that of the toner by the transfer device 56.

Thus, the transfer material 6 onto which the color toner image has been transferred is separated from the surface of the photosensitive drum 30 by the separation electrode 57 and is carried into the fixing device 80 via the conveyor belt to fix the color toner image. After being broken, the paper is discharged by the paper discharge roller pair 81 and a reversing roller pair 82 described later.

On the other hand, transfer of a color toner image onto the transfer material 6,
After the separation, the photosensitive drum 30 is further rotated in the clockwise direction to bring the blade 59A of the cleaning device 59 into a pressure contact state to remove and clean the remaining toner. After the cleaning is completed, the blade 59A is separated from the photosensitive drum 30 again, and a new color image forming process is started.

Then, when a two-sided copy is performed from a document (hereinafter referred to as a two-sided document) 2 on which images are recorded on both sides, a color image is fixed on one side of a transfer material 6 by a reversing conveyance means, as shown in FIG. A pair of reversing rollers provided outside of the color image forming apparatus 1 under the control of the CPU, which is stored in advance as being double-sided copy when discharged to the outside of the color image forming apparatus 1.
When the detection sensor S ₁ detects the passage of the rear end portion (right side in the drawing) of the transfer material 6, the reference numeral 82 starts the reverse rotation with the transfer material 6 being nipped. At the same time, the gate member 61 provided at the position where the discharge conveyance path 60 provided on the left side of the discharge roller 81 and the reversal conveyance path 65 orthogonal to the T-shape branch is rotated clockwise to reverse the conveyance. Open road 65. As shown in the figure, the reversing conveyance path 65 is bent so that the lower part thereof, which is orthogonal to the discharge conveyance path 60 in a T-shape, is bent at a right angle from an appropriate position and is substantially parallel to the lower part of the conveyance part 58. The conveyance guide 41 is formed by 67 and has its right end portion provided on the right side of the timing roller 40.
To face. The transport guide 67 is provided with a plurality of transport roller pairs 66 at appropriate intervals for transporting the transfer material 6.

Therefore, the transfer material 6 passing along the reversing conveyance path 65 opened by the gate member 61 is conveyed by making a U-turn, and after waiting for a moment before the timing roller 40, the timing roller 40 causes the photosensitive drum 30 to move. The color image is transferred and fixed on the opposite surface on which the color image is sent to the destination where the color image is fixed and the color image is recorded on both surfaces of the transfer material 6.

Then, the fixed transfer material 6 is discharged to the outside of the color image forming apparatus 1 through the paper discharge conveying path 60 in which the gate member 61 is rotated counterclockwise in advance and opened by the control of the CPU. When the completion of double-sided copying is detected by the detection sensor S ₂ , the transfer material 6 is separated from the reversing roller pair 82 and the reversing roller pair 82 is not rotated in the reverse direction.

In the color image forming apparatus 1 configured as described above, the timing roller 40, the photoconductor drum 30, and the conveying section 58 in the normal mode, that is, at the time of forming a non-glossy image.
The transfer speed of the transfer material 6 by the transfer means, the fixing roller 10
1 and the pressure roller 102, the fixing speed of the discharge roller pair 81,
For example, all are 120 mm / sec, and the fixing roller 10
The surface temperature of the fixing roller 101 formed by 1 and the pressure roller 102 is 130 ° C.

As the toner used in the color image forming apparatus 1 of this embodiment, a dye and a pigment are dispersed in a polyester resin and crushed into particles having a weight average particle diameter of 3 to 12 μm. The thing of 110 degreeC was used.

Next, an ADF device 10 having an inversion conveying means capable of conveying the double-sided original 2 will be described.

In FIG. 2, 10A is a document table on which a large number of originals 2 can be placed, 3 is a feed roller for feeding the originals 2, 4A is a pair of conveying rollers for conveying the originals to the platen glass 11, 4B. Is a pair of conveying rollers for making a U-turn of the document 2 after reading and conveying it, 5 is a reversing path for reversing the front and back of the document 2, and 7 is a rotatable switching member for switching between a sheet discharging path 8 and a reversing path 5. , 8 is a paper discharge path, 9 is a paper discharge roller pair, and 10B is a paper discharge tray.

The conveyance of a document (hereinafter, referred to as a single-sided document) 2 on which an image is recorded only on one side of the ADF device 10 having the above-described structure will be described. First, the operation panel of the image forming apparatus 1 shown in FIG. By setting the single-sided copy button 110C provided on the 110, the switching member 7 is positioned so as to open the paper discharge path 8. Then, when the copy start button is set, the uppermost original 2 on the original table 10A is sent out by the paper feed roller 3 and conveyed to a predetermined position on the platen glass 11 via the conveying roller pair 4 and 4A group to stop and read an image. The image is read by system A. Then, the document 2 from which the image has been read is formed on the upper surface of the ADF device 10 via the paper discharge path 8 and the paper discharge roller pair 9 which are conveyed by the U-turn by the conveyance roller pair 4B and the guide plate and are opened. The sheet is discharged onto the discharging tray 10B.

Next, when the double-sided original 2 is conveyed, the double-sided copy button 110D is set and the switching member 7 is rotated counterclockwise to close the paper discharge path 8 and open the reverse path 5. Then, the first-time (first surface) conveyance of the double-sided original 2 is carried out in exactly the same manner as in the case of the single-sided original 2 described above, and after the image is set on the platen glass 11 and the image is read, the conveying roller 4B and the switching member 7 are set. The two-sided document 2 that has made a U-turn through it is conveyed to the open reversal path 5 and stored in advance in the CPU.
The second surface of the image read at the time of the first transportation by being transported to the fixed position of the platen glass 11 again via the transport roller pair 4A group that rotates in the direction opposite to the first transportation by the control of Is set with down. When the image on the opposite surface is read, the second (second) surface conveyance is started, and at the same time, the switching member 7 is rotated clockwise by the control of the CPU to open the paper discharge path 8. Then, in the second conveyance, the sheet is discharged onto the sheet discharge tray 9 in exactly the same manner as the above-mentioned conveying path of the one-sided original 2.

In this way, the single-sided original 2 or the double-sided original 2
Are automatically conveyed one after another so that the original image can be read.

Next, the fixing device 80 mounted on the color image forming apparatus 1 will be described.

As shown in FIG. 3, 101 of the fixing device 80 is a fixing roller rotatably bearing-supported at a fixed position.
102 is rotated counterclockwise by the drive system of the color image forming apparatus 1 while being pressed against the fixing roller 101 located on the upper side from below, and at the same time the fixing roller 101 is driven to rotate clockwise. The fixing roller 101 and the pressure roller 102 have built-in heaters H1 and H2 of approximately 400 W each having substantially the same amount of heat generation, and the outer peripheral surface has a silicon rubber layer as a heat-resistant synthetic rubber layer. Is the temperature sensor T
The temperature is detected by S1 and TS2 and is controlled to a prescribed temperature by the control system of the color image forming apparatus 1.

Denoted at 3 is a separation claw of the transfer material, which is pressed against the peripheral surface of the fixing roller 101, and a plurality of separation claws are arranged in parallel with the axis of the fixing roller 101.

Reference numeral 104 denotes a cleaning roller of the fixing roller 101, which is brought into contact with the peripheral surface of the fixing roller 101 by the tip of a brush on the outer periphery and is rotated in the same direction following the rotation thereof.

Reference numeral 105 denotes an oil supply device, whose oil-impregnated portion 105A is always in contact with the peripheral surface of the fixing roller 101 and applies silicon oil to improve the releasing property of the fixing roller 101, that is, the separating property of the transfer material 6.

When the transfer material 6 having the toner image transferred onto the upper surface is conveyed from the direction of arrow A into the fixing device, the transfer material 6 is brought into contact with the upper surface and the lower surface by the pressure contact Q by the fixing roller 101 and the pressure roller 102. From the same time, the toner becomes molten and
In particular, since the back surface of the transfer material 6 is heated, the melted toner sufficiently penetrates into the transfer material 6 and is firmly adhered to it, so that a toner image with a high gloss without offset risk can be obtained.

Control of fixing temperature in the fixing device 80
Management is performed as follows.

FIGS. 4 and 5 show the temperature control circuit and process by the temperature sensors TS1 and TS2. The heater H1 is used when the apparatus is "warm up".
And H2 remain in the ON state, and both the fixing roller 101 and the pressure roller 102 are in the stopped state (OFF),
Therefore, the pressing action of the pressure roller 102 is also released (OFF).

Fixing roller after "warm up" is completed
101 and the pressure roller 102 each reach a predetermined peripheral surface temperature,
In the fixing ready state, that is, in the "ready" stage, the heaters H1 and H2 are turned on and off repeatedly in order to keep the fixing temperature of the transfer material 6 constant, and at the same time, the fixing roller 101 and the pressure roller 102 respectively convey. , Start rotating.

Color image forming apparatus 1 at the "ready" stage
When the "printing" is performed in (1), the pressure roller 102 is in the pressure contact state (ON), and the transfer material 6 that is carried in and the fixing operation of the toner image are performed.

By setting the heating temperature for the lower surface, that is, the back surface of the transfer material 6 to a temperature slightly higher than the heating temperature for the toner image surface of the transfer material 6, the resolution is high and the gloss is rich without so-called offset phenomenon. It is possible to obtain a good quality fixed image.

The heating temperature for the toner image surface, that is, the peripheral surface temperature (T1) of the fixing roller 101 is limited to a temperature of 130 ° C. necessary for melting the toner, whereby excessive melting of the toner is avoided and bleeding occurs. A high-quality fixed image with high resolution is obtained.

On the other hand, the heating temperature for the rear surface, that is, the peripheral surface temperature (T2) of the pressure roller 102 is set to a temperature higher than the peripheral surface temperature (T1) of the fixing roller 101 depending on the material of the transfer material 6. Due to this, the melted toner is sufficiently melted and adsorbed on the transfer material 6, and the image is fixed more firmly. The attraction of the toner to the transfer material 6 is promoted by increasing the nip width of the pressure roller 102 with respect to the fixing roller 101 described above.

The temperature difference between the peripheral surface temperature (T1) of the fixing roller 101 and the peripheral surface temperature (T2) of the pressure roller 102 is 10 ° C. or less except for thin plain paper and some thick paper, as described later.
It is controlled and managed by the temperature detection of the temperature sensors TS1 and TS2 so that it is set in the range of 60 ° C. The toner image thus fixed is fixed as a non-glossy image.

Next, means for forming a glossy image by the color image forming apparatus 1 will be described with reference to FIGS. 1 and 2.

To form a glossy image, the fixing temperature is 130 ° C.
120mm / that was set when the non-glossy image was formed
The required glossy image can be obtained by reducing the fixing speed of sec to 30 mm / sec and fixing.

First, when performing a single-sided copy of a glossy image from the single-sided original 2 onto the surface of the transfer material 6, the single-sided copy button 110C of the operation panel 110 shown in FIG. 8 is set to store the ADF device 10 and the image forming device in advance. The one-sided copy mode is set under the control of the CPU.

When the single-sided original 2 is conveyed from the ADF device 10 and set on the platen glass 11, the intensity of reflected light of the image is compared and measured by a photo interrupter 11A provided facing the image, for example, to obtain a non-glossy image. Whether it is an image or a glossy image is detected. Then, together with the data of the image read at the same time, the non-glossy image is input to the memory M1 of the CPU, and the glossy image is input to the memory M2.

The fixing speed for forming the glossiness of the image is automatically set when any one of the memories M1 and M2 into which the glossiness information is input is taken out.

The one-sided original 2 from which the image has been read is discharged onto the discharge tray 10B through the discharge path 8 of the ADF device 10 described above. Then, the photo interrupter 11A detects that the image is a glossy image, and the input data of the memory M2 is taken out, whereby the fixing speed is automatically set to 30 mm / sec. Then, according to the same procedure as described above of the color image forming apparatus 1, the laser writing system unit B exposes the photosensitive drum 30 on the basis of the data in the memory M2 to form the color formed on the peripheral surface of the photosensitive drum 30. The image is transferred by the transfer pole 56 onto the transfer material 6 conveyed from the paper feeding section D. Then, the transfer material 6 conveyed to the fixing device 80 by the conveying unit 58 via the separation pole 57 has the required glossy image fixed at the fixing speed set to 30 mm / sec corresponding to the glossy image, and then the pair of paper discharge rollers. 8
1. The sheet is discharged to the outside of the apparatus 1 through the pair of reversing rollers 82. It should be noted that the memories M1 and M2 are not always used when copying one side.
You don't have to put it in.

Next, a means for forming a non-glossy image on one side and a glossy image on the other side on both sides of the transfer material 6 from the double-sided original 2 will be described.

Among a large number of double-sided originals 2 placed on the original table 10A of the ADF device 10, the first side is a non-glossy image and the second side is a non-glossy image, and vice versa. The surface is a glossy image, the second is a non-glossy image, or both sides have a non-glossy image or a non-glossy image formed at random. Therefore, in the same manner as the one-sided original 2 described above, the gloss level is detected by the photo interrupter 11A for each image of the two-sided original 2, and the read data is input to the respective memories M1 and M2.

FIG. 7 shows input of the original image information to each of the memories M1 and M2 during double-sided copying or single-sided copying, switching of the transport path of the ADF device 10, switching of the transport path of the color image forming apparatus 1, and fixing speed. The figure illustrates each of the switching situations. Although a description of the one-sided copy is omitted, in FIG. 7, for example, when the first side of the two-sided original 2 is a non-glossy image in the two-sided copy, the second side is detected as a glossy image and stored in the memory M1 together with the read image. And the read image are stored in the memory M2. And A
The DF device 10 is switched to open the reversing path 5, and the switching operation of the reversing conveyance path 65 of the color image forming apparatus 1 is performed. Then, the fixing speed is set to 30 mm / sec and, as shown by the arrow, after forming the glossy image at the first fixing, the fixing speed is switched to 120 mm / sec at the second fixing so that the non-glossy image is fixed. Is becoming This is because if an already formed non-glossy image is fixed at a fixing speed of 30 mm / sec, it becomes a glossy image. Therefore, when forming a glossy image and a non-glossy image on the transfer material 6, the glossy image is fixed first. I am trying to do it. Then, the double-sided original 2 conveyed by the ADF device 10 is input to the image reading systems A of the color image forming apparatus 1 on both sides of the image information M1 and M2. First, the image data of the glossy image is input to the memory M2. Is taken out and the color image is transferred to the transfer material 6 in the same manner as described above, and the gloss image is fixed at a fixing speed of 30 mm / sec (fixing temperature 130 ° C.) corresponding to the gloss image formation. Then, the transfer material 6 is discharged to the outside of the apparatus 1 by the discharge roller 81 and the reversing roller 82, reaches a predetermined position where the rear end (right side in the drawing) is sandwiched by the reversing roller 82, and is detected by a sensor (not shown). Then, the reversing roller 82 is rotated in the clockwise direction by the control of the CPU and the gate is rotated.
61 rotates clockwise to close the discharge conveyance path 60 and open the reverse conveyance path 65.

Then, the transfer material 6 is switched back and conveyed along the reverse conveyance path 65 and stands by in front of the timing roller 40 with the glossy image fixed at the first time facing down. Then, when it is detected by a sensor (not shown) that the transfer material 6 has passed through the reverse conveyance path 65, the paper discharge conveyance path 60 which has been closed is opened. Then, the transfer material 6 sent out from the timing roller 40 is taken out from the memory M1 and the color image formed on the peripheral surface of the photoconductor drum 30 is transferred and fixed to 120 mm / sec corresponding to the formation of a non-glossy image. After a predetermined non-glossy image is fixed by the speed and the fixing temperature of 130 ° C., it is discharged to the outside of the apparatus 1. In this way, a double-sided copy with a glossy image on one side and a non-glossy image on the other side can be obtained. When one side is a glossy image and the other side is a non-glossy image, the glossy image is fixed first as described above.
In this manner, a color image having the required glossiness can be formed on one side or both sides of the transfer material 6 very simply and accurately one after another.

The fixing speed is 120 mm / sec and the fixing temperature is 130 ° C.
Even if the non-glossy image is re-fixed as it is, it will remain the non-glossy image, and it will remain as the glossy image even if the glossy image is re-fixed with the fixing speed of 30 mm / sec (fixing temperature 130 ° C) .. Therefore, as shown in FIG. 7, when both sides of the two-sided original 2 have the same glossiness, a color image having the required glossiness with the fixing speed set to either 120 mm / sec or 30 mm / sec. Is fixed.

It should be noted that although the document 2 is conveyed by using the ADF device 10, the document 2 is not limited to the ADF device 10 and may be manually set on the platen glass 11. In the above, the glossiness of the original 2 is faithfully reproduced on the transfer material 6, but the glossiness of the original image can be changed and the user can arbitrarily set the glossiness of the image. That is, when it is desired to obtain a glossy image from the non-glossy original 2, the fixing device 80 is preferentially set to 30 mm / sec corresponding to the glossy image by setting the gloss button 110A provided on the operation panel 110. You can leave it as it is. On the contrary, when copying a glossy image original as a non-glossy image, the fixing speed is set to 120 mm / sec and the image is fixed by setting the non-glossy button 110B in advance.

In the case of double-sided copying, if the first fixing is a glossy image, the glossiness of the image can be arbitrarily changed by the above operation. It is also possible to make a glossy image on both sides of a document into a non-glossy image on both sides, and these means are of course included in the scope of the present invention.

[0059]

As described above, according to the present invention, the glossiness of the image can be very easily and accurately copied onto the transfer material together with the image data read from the original document on which images are recorded on both sides. ..

Further, in both-sided copying, if the formation of a non-glossy image on both sides and the first fixing are limited to the formation of a glossy image, the user can copy the image by arbitrarily changing the glossiness of the image.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of a color image forming apparatus including an ADF device according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a configuration of an ADF device.

FIG. 3 is a side sectional view showing a configuration of a fixing device.

FIG. 4 is a diagram showing a heating temperature control circuit.

FIG. 5 is an explanatory diagram showing an operating state of each member of the fixing device.

FIG. 6 is a block diagram showing a control circuit of a color image forming apparatus including an ADF device according to an embodiment of the present invention.

FIG. 7 is a chart showing fixing with respect to glossiness of an image according to one embodiment of the present invention and an operation state of each mechanism unit.

FIG. 8 is a plan view showing an operation unit of the color image forming apparatus.

[Explanation of symbols]

 1 image forming apparatus 2 originals (single-sided original, double-sided original) 5 reversal path 6 transfer material 7 switching member 10 ADF device 30 photoconductor drum 40 timing roller 60 paper discharge conveyance path 61 gate member 65 reversal conveyance path 80 fixing device 82 reversal roller Image reading system B Laser writing system unit C Image forming unit D Paper feeding unit

Claims (1)

[Claims] 1. An image forming apparatus for transferring and fixing a toner image formed on an image carrier onto a transfer material, wherein the toner image transferred onto one surface of the transfer material is fixed at a first speed, Re-fixing the toner image on the other surface of the transfer material at a second speed, and either one of the second speed and the first speed is set to a slow speed. Image forming apparatus.