JP3196238B2 - Fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device comprising a heating roll and a pressure roll, and more particularly to an improvement in a fixing device for supplying a release agent to the surface of a heating roll.

[0002]

2. Description of the Related Art Conventionally, as a fixing device of this type, a heating roll, a pressure roll disposed in pressure contact with the heating roll, and a release agent in which a release agent such as silicone oil is supplied to the surface of the heating roll. There has been known a printer having a supply device and a recording sheet holding an unfixed toner image inserted between the two rolls in a state where both rolls are in contact with the roller (JP-A-2-71286, 2-64588). According to this type, good fixability can be obtained while effectively preventing toner offset to the heating roll and the pressure roll.

[0003]

However, in this type of fixing device, as a recording sheet, for example, a transparent resin film sheet (hereinafter referred to as OH) for an overhead projector is used.
In the case where a recording sheet composed of a sheet for P) is used, a release agent such as silicone oil supplied to the roll surface easily accumulates immediately before the nip portion between the heating roll and the pressure roll, Due to the accumulation of the release agent, the leading end of the recording sheet having high smoothness slips, and it becomes difficult for the recording sheet to enter the nip portion between the heating roll and the pressure roll. Many phenomena were seen.

In particular, in a color printer, a color copying machine, and the like, the fixing device is usually driven in the same manner as other process components during a color image forming process, but the exposure, development, and transfer processes are performed several times. In comparison with the monochrome mode, the rate of passage of the recording sheet per unit time to the fixing device in the continuous print mode or the continuous copy mode is reduced, and accordingly, when the recording sheet is not passed, the heating roll of the fixing device and The idle time of the pressure roll becomes longer, and accordingly, the release agent easily accumulates immediately before the nip portion between the heating roll and the pressure roll, and the above-mentioned technical problem is more remarkable.

In addition, when a recording sheet made of plain paper is used in a color printer, a color copying machine, or the like, a release agent such as silicone oil excessively adheres to the leading end of the recording sheet, thereby deteriorating the print or copy quality. It was observed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above technical problem, and it is possible to reliably suppress a jam phenomenon on a recording sheet mainly composed of a transparent resin film sheet such as an OHP sheet, thereby improving the fixing property. In addition, the present invention provides a fixing device capable of avoiding deterioration of image quality due to excessive adhesion of a release agent at the leading end of a recording sheet.

[0007]

Means for Solving the Problems That is, the first invention
As shown in FIG. 1A, a heating roll 1 and
A pressure roll 2 pressed against a heat roll 1;
Release agent supply means 3 for supplying the release agent R to the surface of the nozzle 1
With both rolls 1 and 2 rolled in contact
Sheet holding an unfixed toner image between rollers 1 and 2
4 assuming a fixing device that allows
Roll contact / separation drive means 8 for freely moving the rollers 1 and 2
And at least the recording sheet 4 is a transparent resin film sheet
, The recording sheet 4 is the nip between the two rolls 1 and 2.
A few rotations of the heating roll 1 before reaching the part
Rolls 1 and 2 are arranged in contact with each other, and the rear end of the recording sheet 4
Immediately after passing through the nip of both rolls 1 and 2
The above-mentioned roll contact / separation driving means so that the rolls 1 and 2 are spaced apart.
And a roll contact / separation drive control means 9 for controlling the
It is characterized by the following.

Further , the second invention is shown in FIG.
As described above, the heating roll 1 and the pressure roll 2
And a fixing device provided with a release agent supply means 3.
At least the recording sheet 4 is a transparent resin film sheet
In this case, the recording sheet 4 reaches the nip between the two rolls 1 and 2.
At a point several rotations before the heating roll 1
Of the recording sheet 4 is started.
Immediately after passing through the nip of both rolls 1 and 2
Roll rotation driving means 10 in which the rotation driving of 1 and 2 is stopped
It is characterized by having.

Further, a reference invention related to the present invention is shown in FIG.
As shown in (c), the same heating roll as in the first invention
1. Fixing device provided with pressure roll 2 and release agent supply means 3
On the front side of the nip between both rolls 1 and 2.
A blade 5 for adjusting the amount of the release agent R to be provided;
An advance / retreat drive means 6 for moving the arm 5 freely
At least if the recording sheet 4 is a transparent resin film sheet
In this case, both rows corresponding to the leading end of the entering recording sheet 4
The blade 5 corresponds to the area corresponding to the nip of
From a reference position separated by a predetermined distance from roll 1 or 2
Release the corresponding roll 1 or 2 surface temporarily
After the agent R has been scraped, the above-described process is performed so as to return to the reference position.
Blade drive control means 7 for controlling the retreat drive means 6
It is characterized by the fact that

In such technical means, the specific configuration of the heating roll 1 and the pressing roll 2 includes the roll material, the number of heaters, and the location where the heaters are disposed (both the heating roll 1 and the pressing roll 2 have different positions). May be provided). Also, the design of the release agent supply means 3 may be changed as appropriate, such as supplying a release agent R such as silicone oil contained in an oil pan or the like using a sponge-like member or a roll. From the standpoint of keeping the satisfactorily, it is preferable to design so that the supply amount of the release agent R can be uniformly adjusted.

The design of the blade 5 for adjusting the release agent R amount and the advance / retreat driving means 6 may be changed as appropriate, but at least the blade 5 is damaged when it comes into contact with the heating roll 1 at the time of advance. It is necessary to select a material, a shape, and the like so that the heating roll 1 is not damaged.

Further, with respect to the scraping range of the release agent R by the blade drive control means 7, at least slipping of the recording sheet 4 made of a transparent resin film sheet at the time of entering the fixing device can be effectively prevented. Must be appropriately selected within a range that does not impair. In this case, when the application target is expanded to the recording sheet 4 made of plain paper or the like, the scraping range of the release agent R is set in consideration of the releasability of the recording sheet 4 made of plain paper or the like. Will be.

Further, depending on the type of the release agent R, the operation of scraping the release agent R by the blade drive control means 7 may not be necessary for the recording sheet 4 made of plain paper or the like. In such a case, the sheet identification sensor identifies the recording sheet 4 as a transparent resin film sheet or other plain paper, and operates the blade drive control means 7 only when the recording sheet 4 is a transparent resin film sheet. Alternatively, the blade drive control means 7 may be designed to operate only when the transparent resin film sheet is selected by the mode selection switch or the like.

The roll contact / separation driving means 8 may be any means that moves at least one of the heating roll 1 and the pressure roll 2, and the specific configuration thereof is that the roll 1 or 2 is a movable member. If the configuration is such that the movable member is moved by a drive source, the design may be changed as appropriate.

The contact / separation drive timing of the roll contact / separation drive control means 9 can be appropriately selected by detecting the position of the conveyance path of the recording sheet 4 or the like. Is required to be in a state in which the release agent R is uniformly supplied to both the rolls 1 and 2 at the time when the roll enters the nip portion between the rolls 1 and 2. From this viewpoint, at least the recording sheet 4 It is preferable that the heating roll 1 is several rotations before the nip portion between the two rolls 1 and 2.

Also, the rotation stop timing of the roll rotation drive control means 10 can be appropriately selected by detecting the position of the conveyance path of the recording sheet 4 or the like. At the time of entering the nip portion between the rolls 1 and 2, the rotation operation of each of the rolls 1 and 2 is stable, and
2 needs to be in a state where the release agent R is uniformly supplied. From this viewpoint, the heating is performed at least from the time when the recording sheet 4 enters the nip portion between the two rolls 1 and 2.
It is preferable that the time is several rotations before the roll 1 . In this type, since the driving system of the fixing device is repeatedly turned on and off, it is necessary to design the driving system of the fixing device so as not to affect other driving systems such as the conveyance system of the recording sheet 4. is necessary.

Also, depending on the type of the release agent R, the roll contact / separation drive control means 9 and the roll rotation drive control means 10 may be controlled by the drive control means 9 and 10 for the recording sheet 4 made of plain paper or the like. In some cases, it is not necessary to drive the recording sheet 4. In such a case, the recording sheet 4 is identified by the sheet identification sensor as a transparent resin film sheet or other plain paper, and only when the recording sheet 4 is a transparent resin film sheet. Each of the drive control means 9 and 10 is operated,
Alternatively, the drive control means 9 and 10 may be designed to operate only when the transparent resin film sheet is selected by the mode selection switch or the like.

[0018]

According to the technical means described above, the first
According to Ming, at least from a transparent resin film sheet
Recording sheet 4 between the heating roll 1 and the pressing roll 2
The roll contact / separation drive control means 9
By controlling the contact / separation driving means 8, the recording sheet 4
Immediately before reaching the nip part of No. 2, the two rolls 1 and 2 are placed in contact.
And the rear end of the recording sheet 4 is the nip between the two rolls 1 and 2.
Immediately after passing through, both rolls 1 and 2 are separated from each other. this
Therefore, the idle rotation time between the two rolls 1 and 2 is shortened,
Minutes, the recording sheet 4 rushes into the nip between the rolls 1 and 2
When the mold release agent R is collected unnecessarily just before the nip
And not.

Further , according to the second invention, at least the transparency
The recording sheet 4 made of a clear resin film sheet is heated
Toward the nip between the roll 1 and the pressure roll 2, the roll
The rotation drive control means 10 determines that the recording sheet 4 is
Immediately before reaching the nip portion of No. 2, the rotary drive of both rolls 1 and 2
And the trailing end of the recording sheet 4 is
The rotation of both rolls 1 and 2 is stopped immediately after passing
Stop. Therefore, the idle rotation time between the two rolls 1 and 2 is short.
And the recording sheet 4 becomes nip between the two rolls 1 and 2.
When entering the nip portion, the release agent R
It doesn't really accumulate.

Further, according to the reference invention related to the present invention,
For example, a recording system consisting of at least a transparent resin film sheet
To the nip between the heating roll 1 and the pressure roll 2
When heading, the blade drive control means 7 controls the advance / retreat drive means 6
Control, and the nip between the two rolls 1 and 2 into which the recording sheet 4 enters.
The blade 5 is temporarily moved from the reference position to the
After having advanced, it is returned to the reference position. Because of this, the record
When the sheet 4 enters the nip between the rolls 1 and 2
Has no release agent R immediately before the nip portion between the two rolls 1 and 2
The leading end of the recording sheet 4 is slipped by the release agent R
It is guided to the nip part of both rolls 1 and 2 without performing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. Embodiment 1 FIG. 2 shows an embodiment of a color printer using a fixing device according to the present invention (reference invention) . In the figure, reference numeral 20 denotes a photosensitive drum, 21 denotes a charging corotron for previously charging the surface of the photosensitive drum 20, and 22 denotes a charging corotron 21.
A laser scanning unit 23 for writing an electrostatic latent image on the photosensitive drum 20 charged by the image forming apparatus. Reference numeral 23 denotes a laser scanning unit for storing toner images of black (B), cyan (C), magenta (M), and yellow (Y). Developing units 23B, 23C, 23M, 23
Y is a rotatable rotatable rotary switching unit that is appropriately switched and selected. 24 is a pre-transfer treatment corotron that removes the potential on the photosensitive drum 20. 25 is a cleaner that removes residual toner on the photosensitive drum 20. This is an erase lamp for removing residual charges on the photosensitive drum 20.

Reference numeral 31 denotes a transfer drum which holds a recording sheet 30 (an OHP sheet or plain paper) wound around a peripheral drum sheet and sequentially multiplex-transfers each color component toner image on the photosensitive drum 20 onto the recording sheet 30. The transfer drum 31 includes a sheet charging corotron 32 for charging the drum sheet when the recording sheet 30 is held, a transfer corotron 33 for transferring the toner image on the photosensitive drum 20 to the recording sheet 30, and A charge removing corotron 34 for removing charge from the recording sheet 30 and a sheet removing corotron 35 for removing charge on the drum sheet after the transfer process is completed.
And an inner press roll 36 for pushing up the drum sheet from the inside after the transfer step, and a peeling finger 37 for peeling off the recording sheet 30 pushed up by the inner roll 36 after the transfer step.

Further, reference numeral 40 denotes a fixing device for inserting the recording sheet 30 after the transfer process and fixing an unfixed toner image on the recording sheet 30, and its specific configuration is shown in FIG. In the figure, reference numeral 41 denotes a heater 42 inside.
Is a heating roll having a built-in heater, and 43 is a pressure roll which is disposed to be opposed to the heating roll 41 in a state close to the heating roll 41. In this embodiment, a heater 44 is built therein.

Reference numeral 45 denotes an oil supply device for supplying silicone oil as a release agent.
6, a wick 47 impregnated with silicon oil contained in the oil pan 46, and a rotatable interposition between the wick 47 and the surface of the heating roll 41 to rotate following the heating roll 41, A plurality of supply rolls 48 and 49 for sequentially moving the oil supplied from 47 to the heating roll 41 side are provided. Reference numeral 50 denotes a web cleaner for cleaning paper dust and the like adhering to the heating roll 41, and reference numeral 51 denotes a peeling finger provided on the nip exit side of the pressure roll 43.

Further, reference numerals 55 and 56 denote both rolls 4.
A pair of blades 55 and 56 for adjusting the oil supply amount, which are disposed in front of the nip portions 1, 43, each having a base end as a rotation center and a tip end formed of hard rubber, plastic, or the like. The claw portion 57 is formed. When the solenoid 58 is excited, the blades 55 and 56 are extended and arranged to a position where the tip of the claw 57 contacts the surface of the heating roll 41.
At the time of non-excitation, the tip of the claw portion 57 is retracted by the return spring 59 so as to be located at a reference position separated from the surface of the heating roll 41 by a predetermined gap.

The fixing device 40 and the transfer drum 3
A guide plate 61 for the recording sheet 30 is disposed between the guide plate 1 and a light-emitting unit 63a and a light-receiving unit 63b. A transmission type sensor 63 is provided, and the transmission type sensor 63 detects passage of the recording sheet 30. On the other hand, a guide plate 65 is also provided on the exit side of the nip portion between the two rolls 41, 43, and a fuser exit roll 66 is disposed immediately after the two rolls 41, 43.

The output from the transmission type sensor 63 is input to the drive control circuit 68, and the drive control circuit 68
FIG. 4A shows that the transmission type sensor 63 detects the passage of the recording sheet 30 made of, for example, an OHP sheet.
As shown in the figure, the solenoid excitation signal is output for a predetermined time at a predetermined timing, and the blade 5 is moved to the area M corresponding to the nip portion of the two rolls 41 and 43 where the recording sheet 30 enters.
At 5 and 56, the silicon oil R on the surfaces of the two rolls 41 and 43 is scraped off, and as shown in FIG. 4B, the blades 55 and 56 are referenced by the return biasing force of the return spring 59 at the off timing of the solenoid excitation signal. Return to position.

Thereafter, the recording sheet 30 is moved to both rolls 41,
In the case of entering the nip portion of the recording sheet 30, as shown in FIG.
Since the silicone oil R has been scraped in the area immediately before the nip portion between the rolls 41 and 43, the recording sheet 30 made of the OHP sheet does not slip between the rolls 41 and 43. And passes through the nip area. At this time, a jam phenomenon was hardly observed on the recording sheet 30 made of the OHP sheet, and it was confirmed that the fixing property was maintained extremely well.

In this embodiment, when the recording sheet 30 made of plain paper is used, there is no phenomenon that the silicon print is excessively attached to the leading end of the recording sheet 30 and the color print quality is impaired. The fixability was extremely good.

Second Embodiment FIG. 5 shows a fixing device according to a second embodiment of the present invention (first invention) . In the figure, the basic configuration of the fixing device is the same as that of the first embodiment (the same components as those of the first embodiment are denoted by the same reference numerals and detailed description is omitted). The pressure roll 43 is supported by the contact / separation drive mechanism 70 so as to be able to freely contact and separate from the heating roll 41. In this embodiment, the contact / separation drive mechanism 70 swingably supports the pressure roll 43 with a swing arm 71 having one end as a swing center 71a. While the mating roll 72 is attached, the engaging roll 72 is provided with an eccentric cam 73 that rolls in contact with the engaging roll 72, and the eccentric cam 73 is rotated by a solenoid 74, whereby the pressing roll 43 is moved through the swing arm 71. It is designed to move up and down.

Further, immediately after the fuser outlet roll 66, a fuser outlet sensor 75 for detecting the passage of the trailing edge of the recording sheet 30 is provided. In this embodiment, the fuser outlet sensor 75 is liable to malfunction due to external light. In order to prevent this, a reed switch is used without using an optical sensor.

In this embodiment, the transfer drum 31
The ON signal of the peeling finger 37 and the output of the fuser outlet sensor 75 are input to the drive control circuit 76. The drive control circuit 76 synchronizes the fuser latch signal with the ON signal of the peeling finger 37 as shown in FIG. Is turned on, and the fuser latch signal is turned off in synchronization with the ON signal of the fuser outlet sensor 75. The solenoid 74 is actuated according to the ON signal of the fuser latch signal, and the pressure roll 4 is turned on.
3 is raised and brought into contact with the heating roll 41 (latching). The fuser drive signal for rotating the heating roll 41 and the pressure roll 43 is synchronized with the on / off timing of the main motor.

According to this type, while the color transfer process is repeated a plurality of times, the pressure roll 43 is not latched by the heating roll 41 and the transfer process is completed, for example, a recording sheet composed of an OHP sheet. At the time when the sheet 30 is about to move toward the fixing device, the pressure roll 43 is latched by the heating roll 41 as shown by a solid line in FIG. At the time of entry, the silicone oil R does not unnecessarily accumulate immediately before the nip portion, and the recording sheet 30 is not slipped by the silicone oil R and the two rolls 41,
43 is securely nipped. Then, when the rear end of the recording sheet 30 that has passed through the nip portion has passed the fuser outlet sensor 75, the latch between the pressure roll 43 and the heating roll 41 is released.

At this time, the recording sheet 30 composed of the above-mentioned OHP sheet hardly showed a jam phenomenon, and the fixing property was extremely good.

In this embodiment, when the recording sheet 30 made of plain paper was used, there was no phenomenon that the silicon print was excessively attached to the leading end of the recording sheet 30 and the color print quality was impaired. The fixability was extremely good.

In particular, in this embodiment, the release fingers 51
Since the silicon oil R does not unnecessarily accumulate in the recording sheet 30, it is possible to effectively avoid a situation in which the silicone oil R sticks to the leading end of the recording sheet 30 when the recording sheet 30 is separated by the separation finger 51. Further, since the silicon oil R is not excessively supplied onto the pressure roll 43,
The peeling finger 51 hardly partially scrapes off the silicone oil R on the pressure roll 43, and the recording sheet 30 is less likely to have oil streaks. Furthermore, since the pressure oil 43 is not excessively supplied onto the pressure roller 43 and the pressure roller 43 does not become unnecessarily wet, a gloss level difference of one circumference of the pressure roller 43 on the recording sheet 30 may occur. Not much.

Third Embodiment FIG. 8 shows a fixing device according to a third embodiment of the present invention (second invention) . In the figure, the basic configuration of the fixing device is the same as that of the first embodiment (the same components as those of the first embodiment are denoted by the same reference numerals and detailed description is omitted). A drive control circuit 82 for controlling the rotation operation and the stop operation of the heating roll 41 and the pressure roll 43 is provided.

In this embodiment, the drive control circuit 82
As an input signal, the on signal of the peeling finger 37 of the transfer drum 31 and the output of the fuser outlet sensor 75 are used as input signals, and the fuser drive signal is turned on in synchronization with the on signal of the peeling finger 37 as shown in FIG. The fuser drive signal is turned off in synchronization with the ON signal of the sensor 75, and the drive motor 81 of the heating roll 41 and the pressure roll 43 is driven to rotate when the fuser drive signal is turned on.

According to this type, while the color transfer step is repeated a plurality of times, the heating roll 41 and the pressure roll 43 do not rotate, and the recording sheet composed of, for example, an OHP sheet after the transfer step is completed. When the recording sheet 30 moves toward the fixing device, the two rolls 41 and 43 are driven to rotate. Therefore, when the recording sheet 30 enters the nip portion between the two rolls 41 and 43, the silicone oil R is discharged immediately before the nip portion. Unnecessary accumulation is eliminated, and the recording sheet 30 is reliably nipped by the silicone oil R at the nip portion between the two rolls 41 and 43 without slipping. When the rear end of the recording sheet 30 that has passed through the nip portion has passed the fuser outlet sensor 75, the pressure roll 4
The latch between 3 and the heating roll 41 is released.

At this time, the recording sheet 30 composed of the OHP sheet hardly showed a jam phenomenon, and the fixing property was extremely good.

Further, in this embodiment, when the recording sheet 30 made of plain paper was used, no phenomenon was observed in which the excessive amount of silicon oil adhered to the leading end portion of the recording sheet 30 and the color print quality was impaired. The fixability was extremely good.

[0042]

As described above, according to claims 1 and 2,
According to the invention, the idle rotation of the heating roll and the pressure roll
It saves time, and the reference invention related to the present invention
If it is, the part just before the nip part of the heating roll and the pressure roll
The release agent is removed when the recording sheet enters, and the amount of the release agent accumulated immediately before the nip portion is reduced, so that the recording sheet is made of a transparent resin film sheet such as an OHP sheet having a high smoothness. Even if
While effectively eliminating slippage caused by the release agent, the recording sheet can be reliably nipped between the two rolls, and the jamming effect on the recording sheet with high smoothness is suppressed by that much, improving the fixability. In addition to the above, it is possible to effectively prevent a decrease in image quality due to excessive adhesion of the release agent at the leading end of the recording sheet.

[Brief description of the drawings]

FIGS. 1A to 1C are explanatory views schematically showing a fixing device according to the present invention.

FIG. 2 is an explanatory view showing a first embodiment of a color printer including the present invention has been applied fixing device.

FIG. 3 is an explanatory diagram illustrating details of a fixing device according to the first exemplary embodiment.

FIG. 4 is an explanatory diagram illustrating an operation example of the fixing device according to the first exemplary embodiment.

FIG. 5 is an explanatory diagram showing a fixing device according to a second embodiment of the present invention.

FIG. 6 is a timing chart illustrating an operation example of the fixing device according to the second exemplary embodiment.

FIG. 7 is an explanatory diagram schematically illustrating an operation example of a fixing device according to a second embodiment.

FIG. 8 is an explanatory diagram showing a second embodiment of the fixing device according to the present invention.

FIG. 9 is a timing chart illustrating an operation example of the fixing device according to the third exemplary embodiment.

[Explanation of symbols]

R: release agent, 1: heating roll, 2: pressure roll, 3: release agent supply means, 4: recording sheet, 5: blade , 6: advance / retreat drive means, 7: blade drive control means, 8: roll Contact / separation drive means, 9: roll contact / separation drive control means, 10: roll rotation drive control means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-228077 (JP, A) JP-A-3-87888 (JP, A) JP-A-58-35569 (JP, A) JP-A-60-1985 263181 (JP, A) JP-A-59-113471 (JP, A) JP-A-1-173755 (JP, U) JP-A-56-153962 (JP, U) JP-A-55-47032 (JP, U) Shokai 56-108158 (JP, U) JP-B 64-1032 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 13/20 G03G 15/20

Claims (2)

(57) [Claims] 1. Heating roll (1) and this heating roll
A pressure roll (2) pressed into contact with (1) and a heating roll
(1) The release agent (R) is supplied to the surface of the release agent.
Supply means (3), and both rollers (1, 2) are in contact rolling
In this state, an unfixed toner image is formed between the two rolls (1, 2).
A condition in which the held recording sheet (4) is inserted
The two rolls (1, 2) are moved freely in the dressing device.
Roll contact / separation driving means (8)
When the sheet (4) is a transparent resin film sheet,
Recording sheet (4) reaches the nip of both rolls (1, 2)
At a point several rotations before the heating roll (1)
The rolls (1, 2) are placed in contact with each other, and the recording sheet (4)
Immediately after the rear end has passed the nip of both rolls (1, 2)
The above rolls so that both rolls (1, 2) are spaced apart
Roll contact / separation drive control means for controlling contact / separation drive means (8)
(9) A fixing device comprising: 2. A heating roll (1) and the heating roll
A pressure roll (2) pressed into contact with (1) and a heating roll
(1) The release agent (R) is supplied to the surface of the release agent.
Supply means (3), and both rollers (1, 2) are in contact rolling
In this state, an unfixed toner image is formed between the two rolls (1, 2).
A condition in which the held recording sheet (4) is inserted
In the dressing apparatus, at least the recording sheet (4) is
When the recording sheet (4) is a fat film sheet,
Heats more than reaching the nip of the roll (1,2)
A few revolutions before the roll (1), both rolls (1, 2)
Rotational drive is started, and the rear end of the recording sheet (4) is
Rolls immediately after passing through the nip of
Roll rotation drive control in which the rotation drive of (1, 2) is stopped
A fixing device comprising means (10).