JP2002003042A - Delivery for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device having a sheet delivery capable of obtaining excellent image quality regardless of the kind of sheet to be used. SOLUTION: A discharge control device 39a is provided for appropriately adjusting the conveying speed of sheet delivery rollers 39 according to the kind of sheet to be used. In a case of the kind of sheet which reduces conveying force of the sheet delivery rollers 39, tension in relation to recording sheet 4 is increased by applying the higher conveying speed, and therefore, the shape of an irregular part caused by flexure or slack causing scratches or dirt is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge device of an image forming apparatus which discharges recording paper after fixing in various image forming apparatuses such as a copying machine and a printer toward the outside of the apparatus.

[0002]

2. Description of the Related Art In general, in the above-described various image forming apparatuses, a toner image corresponding to predetermined image information is formed on a photosensitive drum, and a recording paper is formed in such a manner that the timing is synchronized with the formation of the toner image on the photosensitive drum. The toner image is sent to the transfer unit, and the toner image on the photosensitive drum is transferred to the recording paper. The recording paper onto which the toner image has been transferred is separated from the photosensitive drum side by a separating action of a separation claw arranged so as to come into contact with the surface of the photosensitive drum, and then sent to a fixing device, where the fixing roller is driven. The recording sheet on which the toner image is fixed by the action of pressure and heating and the toner image is fixed is discharged to the outside of the apparatus by the conveying action of a sheet discharging roller disposed at the exit of the fixing device. .

[0003] The paper discharge roller is mounted so that a plurality of rollers are separated from each other with respect to one rotation shaft, and the rotation shaft is rotationally driven by using a drive source of a main body. Thus, the recording paper is conveyed while passing between the driven rollers that press against the respective discharge rollers. At this time, the reason for disposing the paper discharge roller and the driven roller in the axial direction is to set a portion where the paper discharge roller and the driven roller are not provided with a weak conveying force in a portion where the paper discharge roller and the driven roller are not provided. Due to the wavy irregularities formed by the bending or loosening of the portion where the conveying force is weak, the stackability of the discharged recording paper is improved.

[0004]

However, in an apparatus in which a plurality of paper discharge rollers and driven rollers are divided in the axial direction and arranged as in the above-described conventional apparatus, for example, recording paper having a large amount of paper dust is used. For paper types that do not provide a good transport force, the wavy irregularities due to bending or loosening,
The shape becomes too large, and the corrugated portions are conveyed while rubbing the surface of the separation claw attached to the fixing device or the photosensitive drum, so that scratches and stains are formed on the toner image and the image is formed. The quality may be impaired.

In view of the above, the recording paper is discharged while being pulled by increasing the transport speed of the paper discharge roller from the original transport speed of the recording paper, and the shape of the corrugated uneven portion due to bending or loosening is suppressed to a small value. Although there is an apparatus which is configured as described above, since the conveyance speed is set so as to correspond to the normal recording paper, bending or loosening in the case of a paper type which decreases the conveyance force as described above is performed. It is not possible to remove the corrugated irregularities due to.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper discharge device of an image forming apparatus capable of obtaining good image quality regardless of the type of paper used.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a predetermined drive is performed so that a recording sheet on which a toner image has been fixed is conveyed to the outside of the apparatus through a fixing device. In a paper discharge device of an image forming apparatus provided with a paper discharge roller rotated by a source, the drive source is provided with a discharge control device for adjusting a conveyance speed of the paper discharge roller according to a type of the recording paper. .

Further, in the invention according to claim 2, the drive source according to claim 1 is provided independently of the drive source of the apparatus main body.

According to a third aspect of the present invention, in the paper discharge roller according to the first aspect of the present invention, the position of the plurality of separation claws provided in the fixing device is determined by a claw-facing position corresponding to each position in the paper conveyance direction. In each of the claw pinching arrangements that do not correspond to the disposition positions of the plurality of separation claws in the paper transport direction, the paper ejection is divided into a plurality of bodies in the axial direction and arranged in the claw nipping arrangement. The pressing force of the roller against the recording sheet is set to be greater than the pressing force of the discharge roller disposed at the claw-facing position on the recording sheet.

According to a fourth aspect of the present invention, the separation claw provided in the fixing device according to the first aspect is provided so as to be able to approach and separate from the fixing roller, and the separation claw is provided in the apparatus. The frame is connected to the frame of the apparatus main body via a link member so as to be separated from the fixing roller in conjunction with the opening operation of the frame provided to be openable and closable on the main body.

According to a fifth aspect of the present invention, there is provided a claw moving mechanism for reciprocating the separation claw for separating the recording sheet from the photosensitive drum side so as to approach and separate from the photosensitive drum. The claw moving mechanism is provided with operating means for directly or indirectly operating the claw moving mechanism.

According to the first or second aspect of the present invention, the transport speed of the discharge roller is appropriately adjusted according to the type of paper used, and the transport force of the discharge roller is reduced. In the case of such a paper type, a higher transport speed is given to increase the tensile force on the recording paper, and the shape of the uneven portion due to bending or loosening that causes abrasion or dirt is reduced. I have.

Further, according to the third aspect of the present invention, only the pressure of the paper discharge roller disposed at the claw sandwiching arrangement portion which does not directly correspond to the separation claw is increased, so that the pressure of the entire paper discharge roller is pressed. In order not to generate excessive roller pressing marks on the recording paper by increasing the force too much, the corrugated irregularities particularly easily formed on the recording paper in the claw sandwiching arrangement are suppressed as small as possible. .

Further, according to the present invention, when removing the recording sheet which has been jammed in the fixing device, the frame of the apparatus main body is opened, and at the same time, the separation claw of the fixing device is fixed to the fixing roller. The recording paper to be removed is easily and quickly separated from the side, and a situation in which the recording paper to be removed catches the separation claw and damages the separation claw is avoided.

According to the fifth aspect of the present invention, when the jammed recording paper is removed, the claw moving mechanism is operated by the operating means, so that the separation claw can be easily and quickly operated from the photosensitive drum side. The recording paper to be removed can be prevented from catching the separation claw and damaging the separation claw.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a digital copying machine according to an embodiment of the present invention;

First, in the digital copying machine 1 shown in FIGS. 1 and 2, an illumination lamp 4 for exposing a document 3 placed on the document glass table 2 is provided below the document glass table 2. In addition to being arranged to reciprocate, mirrors 5, 6, 7 and a lens 8 forming an optical path of the reflected light from the document 3 are arranged, and a color-separated image light beam is received by a light receiving element (CCD) 9.

The image signal for each color output from the CCD 9 is subjected to a predetermined analog image processing by an analog processor 100 as shown in FIG. Processing is performed. The video signal obtained by the image processing in the image processor 101 is converted into a laser light amount signal corresponding to the signal level in the laser driver circuit board 102 while being stored in the image memory 101a in the image processor 101. In response to the laser light amount signal, a laser beam 11 for writing is irradiated onto the photosensitive drum 12 from a laser scanner unit 10 also shown in FIG.

Around the photosensitive drum 12, a primary charger 13 for uniformly charging the surface of the photosensitive drum 12 is arranged in proximity to the photosensitive drum 12, and the above-described laser beam 11
A developing unit 14 that supplies and develops a toner to the electrostatic latent image formed on the photosensitive drum 12 by the exposure is disposed downstream of the photosensitive drum 12 in the rotation direction. Further, below the photosensitive drum 12, a paper feed cassette 50,
55, and each of those paper cassettes 50,
The transfer recording papers 49 and 54 fed by the feed rollers 48 and 53 of 55 and the feed rollers 47, 52 and 51 provided in the feed path are fed to the registration rollers 44 by the feed rollers 46 and 45. After that, the sheet is re-fed toward the transfer area by the registration roller 44 so as to be synchronized with the formation of the toner image on the photosensitive drum 12 described above. In the transfer area, a transfer charger 20 for transferring the toner image to the re-supplied transfer recording paper 49 side is arranged, and the transfer recording paper 4 on which the toner image has been transferred.
A separation charging device 21 and a separation claw 22 for separating the toner image 9 from the photosensitive drum 12 are provided. From the transfer area, a transfer belt 24 for sending the transfer recording paper 49 on which the toner image has been transferred toward the fixing device 25 side. Is provided.

As shown in FIG. 3, a plurality of the separation claws 22 are arranged at appropriate intervals in the axial direction of the photosensitive drum 12 with respect to the claw movable frame 22a. The plurality of separation claws 22, 22,...
The separation claw 22 is attached so as to protrude toward the photosensitive drum 12 from the claw movable frame 22 a side, and a protruding end portion of each separation claw 22 is slidably contacted with the surface of the photosensitive drum 12. I have. The claw movable frame 22a at this time constitutes a claw moving mechanism, and is formed of an elongated member having a substantially L-shaped cross section and extending along the axial direction of the photosensitive drum 12. Each separation claw 22 disposed along one edge of the claw movable frame 22a is urged by a tension spring 22b in a direction in which it comes into pressure contact with the surface of the photosensitive drum 12.

At both ends in the longitudinal direction of the claw movable frame 22a, mounting shafts 22c, 22c are provided so as to project toward both sides in the axial direction of the photosensitive drum 12, respectively. However, it is rotatably mounted on the apparatus body frame side (not shown). That is, the entire claw movable frame 22a is
Each of the separating claws 22 contacts or separates from the surface of the photosensitive drum 12 by the rotating action of the claw movable frame 22a. Or to be configured. At this time, one ends of a pair of tension springs 22d are connected to the other side edge of the claw movable frame 22a, and the respective separation claws 22 are exposed to light by the tension force of each tension spring 22d. The entire claw movable frame 22a is urged in the direction in which it comes into contact with the drum 12 side.

Further, a claw operation lever 22e, which is a means for operating the movable frame 22a, is attached to an end face of the claw movable frame 22a serving as the claw moving mechanism on the front side in the longitudinal direction so as to protrude. ,
By applying an operating force to press the claw operation lever 22e downward, the movable frame 2
When the entire 2a is rotated, the respective separating claws 22 are separated from the surface of the photosensitive drum 12. When no operation is performed on the claw operation lever 22e, each separation claw 22 is maintained in a state of being pressed against the surface of the photosensitive drum 12 by the urging force of the tension spring 22d.

On the other hand, as particularly shown in FIGS. 7 and 8, the transport belt 24 is connected to the transfer charger 20 described above.
The transfer charger 20 is attached to a common transfer movable frame 25 rotatably mounted on the apparatus main body together with the separation charger 21, and is disposed at a swing end portion of the transfer movable frame 25. And the separation charger 21 and the transport belt 24 are configured to be swung between an operating state (see FIG. 7) and a standby state (see FIG. 8) by the rotating action of the transfer movable frame 25. I have. At this time, the transfer operation lever 2 is
The cam surface of the set cam 27 which is rotated by the abutment 6 is in contact with the transfer cam frame 25. The swing operation of the set cam 27 causes the transfer movable frame 25 to swing as described above.

Returning to FIG. 1, a cleaning device 23 for scraping off the toner remaining on the photosensitive drum 12 is disposed downstream of the separation claw 22 in the rotation direction of the photosensitive drum 12, and the cleaning device 23 is provided. Device 23
Drum 12 whose surface has been initialized by the sliding action of
Is sent again toward the primary charger 13 described above.

On the other hand, the fixing device 30 provided on the exit side of the conveyor belt 24 has a heating roller 31 and a pressure roller 32 as shown in FIG. On the side, a pair of heaters 31a, 31a
Is provided. Each of the heaters 31a heats the surface of the heating roller 31 to a constant temperature in order to fuse the toner on the transfer recording paper 49, and the surface of the pressure roller 32 is made of silicon rubber or the like. The heating roller 31 is pressed against the heating roller 31 at a constant pressure. Then, the transfer recording paper 49 to which the toner image has been transferred is heated and pressed while passing through a nip formed by the heating roller 31 and the pressure roller 32, whereby the transfer recording paper 49 The unfixed toner image is fixed and fixed on the transfer recording paper 49 side.

Edges of separation claws 35 and 36 made of a heat-resistant resin are in contact with the respective surfaces on the outlet side (left side in the figure) of the heating roller 31 and the pressure roller 32, respectively. When the transfer recording paper 49 is not peeled off from the roller 31 and the pressure roller 32, each of the separation claws 3
The transfer recording paper 49 is forcibly separated by the scraping action of 5, 36. Each of these separation claws 3
As shown in FIG. 5, a plurality of the rollers 5 and 36 are arranged at substantially equal intervals along the axial direction of the heating roller 31 and the pressure roller 32.

At this time, each of the separation claws 35 provided on the heating roller 31 side is, as shown in FIG.
The fixing upper cover 33 is attached so as to be axially parallel along the wall surface 33a on the downstream side in the paper conveyance direction. The fixing upper cover 33 is provided to be openable and closable up and down around a support shaft 33b provided on the upstream side in the paper transport direction.
The fixing upper cover 33 is opened upward when the transfer recording paper is jammed in the fixing device 30 or the like.

On the other hand, the upper frame 1a of the apparatus main body 1 according to the present embodiment has a so-called crocodile configuration in which a portion on the front side is opened upward to perform jam processing and the like. The above-described fixing upper cover 33 is connected to the upper frame 1 a of the apparatus main body 1 via a link member 34. The link member 34 is formed of a member such as a wire, and by connecting a substantially central portion in the axial direction of the fixing upper cover 33 to the upper frame 1a side, the The fixing upper cover 33 is opened in conjunction with the opening operation. That is, when the upper frame 1 a is opened, the separation claw 35 is separated from the heating roller 31 together with the fixing upper cover 33. Also, the upper frame 1a
Is closed downward, the fixing upper cover 3
3 is closed by being returned to its original position by its own weight, and as a result, the separation claw 35 comes into contact with the heating roller 31 again.

In the fixing device 30 described above,
Due to insufficient heating and pressurization of the toner image on the transfer recording paper 49, the toner on the transfer recording paper 49 may transfer (offset) to the heating roller 31 side.
Further, since paper dust slightly adhering to the transfer recording paper 49 may be adsorbed to the heating roller 31 side,
A cleaning device for removing such offset toner and paper dust is provided.

On the downstream side (left side in the figure) of the separation claws 35 and 36, a paper ejection sensor 37 for detecting the transfer of the transfer recording paper 49 is arranged. This paper ejection sensor 37
Is composed of, for example, a photo sensor that detects the operation of a paper discharge flag that is oscillated when the transfer recording paper 49 is conveyed, and a paper discharge timing signal is issued from the paper discharge sensor 37 to control the paper discharge control. The operation is performed, and the paper discharge counter is measured.

Further, a discharge roller 39 is provided in a discharge path provided on the downstream side (left side in the drawing) of the discharge sensor 37.
A driven roller 40 pressed against the paper discharge roller 39 is arranged, and a discharge guide plate extending from the paper discharge roller 39 and the driven roller 40 has a discharge roller having a similar configuration. A paper roller 41 and a driven roller 42 are arranged. A discharge tray 43 for receiving the discharged transfer recording paper 49 in a stacked manner is attached to the exit side of the discharge roller 41 and the driven roller 42.

At this time, as shown particularly in FIG. 5, the paper discharge roller 39 and the driven roller 40 are divided into a plurality of members in the axial direction, and the plurality of paper discharge rollers 39 are provided. Are attached so as to be scattered on a common rotating shaft 39a, and each of the driven rollers 40 provided corresponding to each of the paper discharge rollers 39 is rotatable in an independent state. Supported. The drive shaft 39a is connected to a drive source 39b provided separately and independently from the drive source on the apparatus main body side, and is configured to be rotationally driven. A discharge control unit 39c is provided. The discharge control section 39c has a function of changing and adjusting the rotational drive speed of the discharge roller 39, that is, the paper transport speed, according to the type of the transfer recording paper 49.

More specifically, first, the transport speed of the discharge roller 39, which is rotationally driven by the drive source 39b, is higher than the transport speed of the discharge roller 39, which is rotationally driven by the drive source on the apparatus main body side. Is set to be always larger, so that the discharge roller 39 discharges and conveys the recording paper 49 while constantly applying a tensile force to the recording paper 49. The shape of the wave-shaped uneven portion due to loosening (see the section of the prior art) is suppressed to be small. In addition, the above-described discharge control unit 39c is provided for, for example, a case where a paper type that cannot obtain the same conveyance force as that of a normal recording sheet, such as a recording sheet having a large amount of paper dust, is used. Has a function to further increase the conveying speed than in the case of using, so that even in the case of a paper type that reduces such a conveying force, it is possible to remove uneven portions due to bending or loosening. I have.

The setting of the type of recording paper to be used may be manually input from the operation panel, or a special paper feed cassette may be prepared, or the paper type may be automatically identified using an optical sensor or the like. It is possible to

As described above, the paper discharge roller 39 and the driven roller 40 are mounted so as to be scattered at appropriate intervals on the rotating shaft 39a. The arrangement position of 40 is determined by a claw facing position corresponding to each arrangement position of the plurality of separation claws 35 provided on the fixing device 30 and a claw sandwiching arrangement not corresponding to the arrangement position of each separation claw 35 described above. Either one. And
Discharge roller 39 and driven roller 4 arranged in a claw sandwiching arrangement
At 0, the pressing force against the transfer recording paper 49 is set to be larger than the pressing force against the transfer recording paper 49 of the discharge roller 39 and the driven roller 40 arranged at the claw-facing position. That is, by increasing only the pressure contact force of the paper discharge roller 39 disposed at the claw sandwiching arrangement portion that does not directly correspond to the separation claw 35, transfer recording is performed so that the pressure contact force of the entire paper discharge roller 39 is not excessively increased. While preventing the roller pressing traces from being generated on the paper 49, the shape of the corrugated uneven portion which is likely to be generated on the transfer recording paper 49 in the claw sandwiching arrangement is suppressed as small as possible.

As described above, in the present embodiment, the discharge control unit 3
9c, the transport speed of the discharge roller 39 is appropriately adjusted depending on the type of paper to be used. In the case of a paper type that reduces the transport force of the discharge roller 39, a higher transport speed is used. To increase the tensile force on the transfer recording paper 49, and to reduce the shape of the corrugated portion due to bending or loosening that causes abrasion or dirt. Therefore, excellent paper discharge is always performed regardless of the type of the transfer recording paper 49 used.

The discharge roller 39 according to this embodiment is
In the fixing device 30, only the pressing force of the paper discharge roller 39 disposed at the claw sandwiching portion that does not directly correspond to the separation claw 35 in the fixing device 30 is increased, so that the pressing force of the entire paper discharging roller 39 is not excessively increased. In order to prevent the roller pressing traces from being generated on the transfer recording paper 49, the corrugated uneven portions that are easily formed on the transfer recording paper 49 in the claw sandwiching arrangement are suppressed as small as possible in shape.
The state in which the corrugated uneven portion rubs the separation claw 35 is eliminated, and the deterioration of image quality is avoided.

Further, when removing the transfer recording paper 49 which has been jammed in the transfer area, first, the transfer operation lever 26 is operated from the state of FIG. 7 to the state of FIG. Charger 20 and separate charger 2
8 is separated from the photosensitive drum 2 side as shown in FIG. 8, and the transfer area is opened. Next, by operating the claw operation lever 22e as a claw moving mechanism downward from the state of FIG. 7 to the state of FIG. 8, the separation claw 22 is moved from the photosensitive drum 2 side as shown in FIG. The separation area is opened by being separated from the photosensitive drum 2 side. If the transfer recording paper 49 is removed in such an open state, a situation in which the transfer recording paper 49 to be removed catches the separation claw 22 and is damaged is avoided.
Quick work becomes possible.

When the jammed recording paper 49 in the fixing device 30 is to be removed, the frame 1a of the apparatus main body 1 is opened to release the separation claw of the fixing device 30 via the link member 34. 35 is easily and quickly separated from the heating roller 31 side. Therefore, if the transfer recording paper 49 is removed in such an open state, a situation in which the recording paper 49 to be removed catches the separation claw 35 and damages the separation claw 35 can be avoided.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention. Nor.

For example, as shown in FIGS. 9 and 10, the transfer movable frame 25 supporting the conveyor belt 24, the transfer charger 20 and the separation charger 21 and the separation claw 22 are supported. If the claw movable frame 22a is connected so as to be interlocked with the link 28, only the operation of the transfer operation lever 26 opens both the transfer area and the separation area, thereby further improving the jam processing. It can be done quickly.

The present invention can be similarly applied to an image forming apparatus other than the copying machine as in the above-described embodiment.

[0043]

As described above, according to the first or second aspect of the present invention, the discharge control device for appropriately adjusting the transfer speed of the discharge roller according to the type of paper used is provided, and the transfer force of the discharge roller is provided. In the case of a paper type that lowers the paper surface, a higher conveying speed is applied to increase the tensile force on the recording paper, and the shape of the uneven portion due to bending or loosening that causes abrasion or dirt is reduced. Therefore, good image quality can be obtained regardless of the type of paper used, and the reliability of the image forming apparatus can be improved.

According to a third aspect of the present invention, in addition to the structure of the above-described aspect, only the pressing force of the paper discharge roller disposed at the claw sandwiching portion that does not directly correspond to the separation claw is increased. Do not increase the pressing force of the entire paper ejection roller too much so as not to generate roller pressing marks on the recording paper.
Since the corrugated portions that are particularly likely to be formed on the recording paper sheet in the claw sandwiching arrangement are reduced as much as possible in shape, the above-described effects can be further improved.

According to a fourth aspect of the present invention, in addition to the configuration of the above-mentioned invention, when removing a recording sheet that has been jammed in the fixing device, the fixing roller is opened only by opening the frame of the apparatus main body. By providing a link member for separating the separation claw from the fixing roller, the separation claw can be easily and quickly separated from the fixing roller side so as to avoid a situation where the recording paper to be removed catches the separation claw and damages the separation claw. Therefore, in addition to the above-described effects, it is possible to improve the workability of taking out the recording paper.

According to a fifth aspect of the present invention, in addition to the constitution of the above-mentioned invention, the photosensitive drum is operated by operating the claw moving mechanism by operating means when removing the recording sheet which has been jammed in the transfer area. The separation claw is easily and quickly separated from the side to avoid a situation in which the recording paper to be removed may catch the separation claw and damage the separation claw. It is possible to improve the workability of taking out the paper.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a digital copying machine equipped with an embodiment of a paper discharge device according to the present invention.

FIG. 2 is a block diagram showing a control system of the digital copying machine shown in FIG.

FIG. 3 is an external perspective explanatory view showing a claw moving mechanism of the separation claw according to the embodiment of the present invention.

FIG. 4 is an explanatory side view illustrating an embodiment of a paper discharge device according to the embodiment of the present invention.

5 is an explanatory plan view of the sheet discharging device shown in FIG. 4;

FIG. 6 is a partially enlarged external perspective view illustrating an open structure of the fixing device according to the embodiment of the present disclosure.

FIG. 7 is an explanatory side view showing a claw moving mechanism of the separation claw according to the embodiment of the present invention.

8 is an explanatory side view showing an open state of the claw moving mechanism shown in FIG. 7;

FIG. 9 is an explanatory side view showing a claw moving mechanism of a separation claw according to another embodiment of the present invention.

10 is an explanatory side view showing an open state of the claw moving mechanism shown in FIG. 9;

[Explanation of symbols]

 Reference Signs List 1 digital copying machine (apparatus main body) 1a upper frame 12 photosensitive drum 20 transfer charger 21 separation charger 22 separation claw 22a claw movable frame 22e claw operation lever 24 transport belt 25 transfer movable frame 26 transfer operation lever 27 set cam 28 link Reference Signs List 30 fixing device 31 heating roller 33 fixing upper cover 34 link member 35 separation claw 39 discharge roller 39a rotating shaft 39b independent drive source 39c discharge control unit 40 driven roller 49 transfer recording paper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) G03G 21/14 G03G 21/00 372 3F053 F term (reference) 2H027 DA26 DC02 EC06 ED19 ED24 ED25 EE03 EE05 EF09 2H032 BA01 BA12 BA13 BA19 BA21 BA23 DA12 DA18 DA19 DA24 2H033 AA10 AA14 AA37 BA06 BA10 BA12 BA16 BA21 BA22 BB37 CA01 CA16 CA17 CA26 CA36 2H072 AA15 AA17 AA22 AB09 FB08 3F049 CA02 CA04 DA11 EA10 EA12 LA02 LA07 A03 LA03

Claims (5)

[Claims] An image forming apparatus including a sheet discharging roller that is driven to rotate by a predetermined driving source so as to convey a recording sheet on which a toner image has been fixed toward the outside of the apparatus through a fixing device. A discharge device for an image forming apparatus, wherein the drive source is provided with a discharge control device that adjusts a conveying speed of a discharge roller according to a type of the recording sheet. 2. A sheet discharging device for an image forming apparatus, wherein the driving source according to claim 1 is provided independently of a driving source of an apparatus main body. 3. The paper discharge roller according to claim 1, wherein the position of the plurality of separation claws provided in the fixing device corresponds to the position of the plurality of separation claws in the paper transport direction, and the position of the plurality of separation claws. In each of the claw sandwiching arrangements that do not correspond in the paper transport direction, each is divided into a plurality of bodies in the axial direction, and the pressing force of the discharge rollers arranged in the claw sandwiching arrangement on the recording paper is A paper ejection device for an image forming apparatus, wherein the paper ejection roller disposed at the claw-facing position is set to be larger than a pressing force against a recording sheet. 4. The fixing device according to claim 1, wherein the separation claw is provided so as to be able to approach and separate from the fixing roller, and the separation claw is provided on the apparatus main body so as to be openable and closable. A sheet discharging device for an image forming apparatus, wherein the sheet discharging device is connected to a frame of the apparatus main body via a link member so as to be separated from a fixing roller in conjunction with an opening operation of the frame. 5. A claw moving mechanism for reciprocating the separation claw for separating the recording paper from the photosensitive drum side so as to approach or separate from the photosensitive drum, wherein the claw moving mechanism is provided. A sheet discharging device for an image forming apparatus, further comprising operating means for directly or indirectly operating the claw moving mechanism.