JP2001305903A - Fixing device and image forming device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device improved in operability at the time of maintenance, and an image forming device having the same. SOLUTION: This fixing device has a guiding member 74 provided opposedly to a separating member 46 separating paper from a pair of fixing roll and guiding the paper separated from a pair of fixing roll by the member 46 between the member 46 and the member 74. The member 74 can rock and can occupy a guiding position where it guides the paper separated from the fixing roll between the member 46 and the member 74 and an opening position where it opens a path for the paper separated from the fixing roll. The fixing device has a position holding means 91 for positionally holding the member 74 at the opening position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device such as a copying machine, a printer, a facsimile, a plotter, and the like, and an image forming apparatus provided with the fixing device. More specifically, the present invention guides a sheet separated from a fixing roller pair. The present invention relates to a fixing device having a guide member and an image forming apparatus provided with the fixing device.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus, an image formed on an image carrier such as a photoreceptor is transferred onto a sheet, and a sheet carrying an unfixed image is fixed through a fixing device. The fixing device includes a fixing roller having a heat source and a pressure roller pressed against the fixing roller, and nips and conveys a sheet carrying an unfixed image composed of a toner image and the like at a nip portion between the fixing roller and the pressure roller. While fixing by heat and pressure,
A so-called heat roller type is generally used.

Since an unfixed image of a sheet directly contacts the fixing roller, the sheet is easily wound around the fixing roller, which may cause a jam in the fixing device. For this reason, the fixing roller is usually provided with a surface layer having excellent releasability, and is provided with a separation claw as a separation member that comes into contact with the surface of the fixing roller and separates the sheet from the fixing roller.

Conventionally, a guide member for guiding the fixed sheet separated from the fixing roller by the separation claw between the separation claw and the separation claw is fixedly provided at a position facing the separation claw. In Japanese Patent Application No. 11-301855, the applicant has made the guide member swingable in a direction of separating from the separation claw in order to improve workability during maintenance such as when a jam occurs in the fixing device,
A technique for greatly opening the paper transport path has been proposed.

[0005]

However, since such a guide member by the present applicant is constantly urged in a direction approaching the separation claw, the operator is required to perform maintenance during a jam or the like. Therefore, it is necessary to apply a force for maintaining the guide member in a state where the sheet transport path is opened. In order to further improve the workability, it is preferable that the fixing device be provided with a configuration in which the guide member holds the sheet conveying path open. Such improvement in operability is very important in recent years, in which the size of the image forming apparatus is reduced and the space around the fixing device tends to be reduced in order to improve the image forming speed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fixing device in which operability during maintenance is further improved as compared with the related art, and an image forming apparatus having the same.

[0007]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a separating member for separating a sheet from a fixing roller pair, and a separating member provided to face the separating member. A guide member that guides the sheet separated from the fixing roller pair between the fixing member and the separation member,
The guide member is swingable, and a guide position that guides the sheet separated from the fixing roller between the separation member and an opening position that opens a passage of the sheet separated from the fixing roller. In a fixing device that can be occupied, a position holding unit for holding the position of the guide member at the open position is provided.

According to a second aspect of the present invention, in the fixing device of the first aspect, the position holding means is provided on the guide member and supports the guide member main body in a swingable manner. And a resilient member disposed on the main body side and engaged with the supporting portion.

According to a third aspect of the present invention, in the fixing device of the second aspect, the support portion has a shaft portion having a D-shaped cross section, and the guide member has an arc-shaped portion of the shaft portion. The position is held at the open position when engaging with the elastic member.

[0010] The invention according to claim 4 is the invention according to claims 1 to 3.
The fixing device according to any one of the above, further comprising an urging means for urging the guide member in a direction occupying the guide position.

[0011] The invention according to claim 5 is the invention according to claims 1 to 4.
The fixing device according to any one of the above, further comprising a receiving portion disposed on the fixing device main body side, and a received portion disposed on the guide member and engaged with the receiving portion. The guide member occupies the guide position by engaging with the receiving portion.

The invention according to claim 6 is the invention according to claims 1 to 6
An image forming apparatus having the fixing device according to any one of the above.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. With reference to FIG. 1, an outline of the overall configuration of a copying machine as an image forming apparatus in the present embodiment will be described together with an operation. In the copying machine 100, the sheets are sequentially directed to the registration roller pair 10 one by one from the top one of the plurality of paper feed trays 2, 4, 6, and 8 provided below the selected paper feed tray. Sent out. The paper is fed out, and the photoconductor 1 is moved by the image writing device 14 based on the image information read by the image reading device 12.
6, an electrostatic latent image is formed. The electrostatic latent image is visualized into a toner image by the developing device 18.

After the paper is once stopped by the pair of registration rollers 10, the paper is conveyed upward at a predetermined timing and fed between the photosensitive member 16 and the transfer roller, where the toner image is transferred. The sheet on which the image has been transferred is transported further upward from the transfer unit and sent to the fixing device 22, where the image is fixed by heat and pressure. The paper on which the image has been fixed is discharged to the inner one bin tray 26 via the paper discharging device 24, or sent to the relay unit 28, or sent to the automatic duplex unit 30.

The sheet sent to the relay unit 28 is discharged to a sheet discharge tray 32 formed on the upper surface of the relay unit 28 or sent to a finisher 34 as a sheet post-processing device. The sheet sent to the finisher 34 is discharged to the sheet discharge tray 36 without performing post-processing such as binding processing, or discharged to the sheet discharge tray 36 after post-processing. The paper transport path from the pair of registration rollers 10 to the fixing device 22 is set to be substantially vertical. After the paper is sent upward from the fixing device 22, the paper is changed direction and discharged to the inner one bin tray 26 and the like. In FIG. 1, reference numeral 38 denotes an automatic document feeder, and reference numeral 40 denotes a manual feed tray.

As shown in FIG. 2, the heat roller type fixing device 22 has a fixing roller pair 45 having a fixing roller 42 and a pressure roller 44, a fixing separation claw 46 as a separating member, and the like. The fixing roller 42 has two heaters 4 inside.
Eight. A thermistor 50 for detecting the temperature of the fixing roller 42 is in contact with the surface of the fixing roller 42.

The pressure roller 44 is pressed against the fixing roller 42 by a pressure lever 52 and a pressure spring 54. A cleaning roller 56 is pressed against the pressure roller 44 by a spring 58.

A plurality of fixing separation claws 46 are arranged at equal intervals in the axial direction of the fixing roller 42, and five fixing separation claws 46 are provided in this embodiment (see FIG. 4). Each fixing / separating claw 46 is urged by a spring 60, and its tip is in contact with the surface of the fixing roller 42 with a predetermined pressure. In FIG.
Denotes a temperature fuse, 64 denotes a static elimination needle, 66 denotes a sheet discharge sensor filler, 68 denotes a sheet discharge drive roller, 70 denotes a sheet discharge driven roller, and 72 denotes a full state detection sensor filler.

As shown in FIGS. 2 and 3, an exit as a guide member for guiding the non-image side of the sheet in the case of single-sided copying is provided at a position facing the fixing separation claw 46 on the sheet exit side of the fixing device 22. A side paper guide member 74 is provided rotatably in the paper transport direction. Downstream from the exit of the fixing device 22, a sheet conveyance guide member 76 is provided so as to be able to swing outward with the shaft 78 as a fulcrum, and to be rotatable in this embodiment. The sheet conveyance guide member 76 is provided with the fixing separation claw 46.
The sheet separated from the fixing roller 42 is guided by the fixing roller 42 between the fixing roller 42 and the fixing roller 42, as shown by a two-dot chain line in FIG. A guide position for guiding the paper,
In FIG. 3, it is possible to occupy an open position for opening the passage of the sheet separated from the fixing roller 42 as indicated by a solid line.

The right cover 80 of the apparatus main body is provided so as to be rotatable to the outside of the apparatus with the shaft 82 as a fulcrum. When the right cover 80 is opened, most of the substantially vertical sheet conveyance path is opened. It has become so. When a jam occurs in the fixing device 22, first, the right cover 80 is opened, and the sheet conveyance guide member 76 is rotated outward to be opened, and then the jammed sheet P is taken out. The position indicated by the solid line in FIG. 3 is the open position of the right cover 80.

As shown in FIG. 4, the fixing device 22 includes an upper frame 84 having a paper exit E and a lower frame 86.
The main fixing members such as the fixing roller 42 and the pressure roller 44 are mounted on the lower frame 86. The exit-side paper guide member 74 has, at both ends thereof, a rotation shaft 74 a as a rotation fulcrum serving as a support portion extending in the axial direction of the fixing roller 42.
Since the rotating shaft 74 a is supported by the upper frame 84, the main body of the paper guide member 74 on the exit side is fixed to the fixing device 2.
It is provided so as to be swingable with respect to the two main bodies, and rotatably in this embodiment. The rotation shaft 74 a has a shaft portion 75 having a D-shaped cross section in an inner portion of the upper frame 86. In FIG. 4, a leaf spring 92 and a screw 93 (to be described later) (FIG. 8)
To 9) are omitted.

As shown in FIG. 5, a torsion coil spring 88 as an urging means is attached to the rotating shaft 74a, and the outlet side paper guide member 74 is oriented in the guide position, in other words, the fixing separation claw 46. It is biased to the side. A vertical wall 84b extending in the axial direction of the fixing roller 42 is formed near the exit side paper guide member 74 of the upper frame 84. By providing the vertical wall 84b in this manner, it is possible to prevent the vapor generated in the fixing device 22 from escaping from the gap between the exit side paper guide member 74 and the upper frame 84 to the outside of the device. The dew condensation of the paper discharge device 24 and the like can be prevented. Vertical wall 84
Since the vapor reservoir is formed by forming b, it is not necessary to strictly manage the gap between the exit-side paper guide member 74 and the upper frame 84, and the exit-side paper guide member 74 is fixed by the fixing heat. Even if the upper frame 84 is warped, it is possible to effectively prevent the steam from going out of the fixing device 22.

A plurality of ribs 74c extending in the paper transport direction are formed on the paper guide surface side of the outlet paper guide member 74. Due to the presence of the ribs 74c, friction between the sheet and the guide surface of the exit side sheet guide member 74 is reduced, and the transportability can be improved. Further, since the exit side paper guide member 74 can be easily rotated by hand so that maintenance of the fixing device such as a jam process can be easily performed, the exit side paper guide heated to a high temperature by the fixing heat. If the hand touches a wide area of the guide surface of the member 74, there is a risk of burns or the like, but the presence of the rib 74c eliminates such a concern. Fin-shaped rib 74c
Has good heat radiation properties, so that even if the ribs 74c themselves are touched by hand, heat on the guide surface is not easily transmitted. The tip of the rib 74c protrudes from the guide base 74e, so that the tip of the exit side paper guide member 74 has a comb-shaped guide portion.

As shown in FIG. 6, the rotation fulcrum S of the outlet-side paper guide member 74, that is, the axial center position of the rotary shaft 74a is determined by the length L of the guide surface 74d of the outlet-side paper guide member 74 in the paper transport direction. Is set on the upstream side in the paper transport direction with respect to the normal G of the guide surface 74d at the intermediate position of the above.

As shown in FIG. 7, the paper transport guide member 7
6 also has a plurality of ribs 76a to form a comb-shaped guide portion. Rib 74 of exit side paper guide member 74
c and the rib 76a of the paper transport guide member 76 are formed at positions where they do not interfere with each other.
The exit-side paper guide member 74 is provided rotatably to a predetermined position without opening the paper guide member.

As shown in FIGS. 8 to 10, the fixing device 2
Position holding means 91 for holding the position of the exit-side paper guide member 74 at the open position.
have. The position holding means 91 is provided corresponding to each end of the main body of the exit side paper guide member 74 in the axial direction of the fixing roller 42. The position holding unit 91 is provided between the rotating shaft 74 a and the fixing device 22 main body side, that is, the upper frame 8.
4 and a leaf spring 92 as an elastic member engaged with the rotating shaft 74a. One end of the leaf spring 92 is screwed to the upper frame 84 with a screw 93,
The other end is in contact with the shaft 75 of the rotating shaft 74a.

Upper frame 84 and exit side paper guide member 7
4 have overlapping portions 84a and 74b vertically overlapping each other as a receiving portion and a receiving portion, and the exit side paper guide member 74 is guided by the contact between the overlapping portions 84a and 74b. The position is determined.

As shown in FIG. 8, when the exit side paper guide member 74 occupies the guide position, the entire surface of the flat portion 75a of the shaft portion 75 abuts along the leaf spring 92, and the coil spring 88 is moved out of the exit portion. The exit side paper guide member 74 is held at the guide position together with the side paper guide member 74 being urged in the direction occupying the guide position and the overlapping portions 74b and 84a being in contact with each other. Have been.

As shown in FIG. 9, the exit side paper guide member 74 is slightly rotated so that a corner 75c which is a boundary between the flat portion 75a of the shaft portion 75 and the arc-shaped portion 75b abuts on the leaf spring 92. In the contact state, the leaf spring 92 is elastically deformed, and together with the fact that the coil spring 88 biases the exit side paper guide member 74 in the direction occupying the guide position, the exit side paper guide member 74 is moved to the guide position. Energize towards. Therefore, in order to maintain the state in which the corner portion 75c is in contact with the leaf spring 92, the stress must be continuously applied by the operator's hand or the like. Returns to the guide position.

However, as shown in FIG. 10, when the arc-shaped portion 75b of the shaft portion 75 contacts the leaf spring 92, that is, when the exit paper guide member 74 occupies the open position, the coil spring 88 is driven by the exit spring paper. Although the guide member 74 is urged in the direction occupying the guide position, the exit side paper guide member 74 does not rotate due to the contact force between the arcuate portion 75 b of the shaft portion 75 and the leaf spring 92. It is held in position. The elastic force of the leaf spring 92 is determined by considering the elastic force of the torsion coil spring 88, the rotational moment of the outlet paper guide member 74, and the frictional force between the leaf spring 92 and the shaft portion 75. When the leaf spring 92 comes into contact with the leaf spring 92, the exit side paper guide member 74 is set to be held at that position. The shaft 75
Has a predetermined peripheral length, and the open position of the exit side paper guide member 74 has a predetermined width, as apparent from FIGS. FIG.
The state is shown in which the exit side paper guide member 74 is rotated the most from the guide position to occupy the open position.

Also, a torsion coil spring 88 and a leaf spring 92
As shown in FIG. 12, the torque T urging the outlet-side paper guide member 74 by the force F is the force that the outlet-side paper guide member 74 receives from the conveyed sheet, and the force F is
Is set to satisfy the relationship of T−r × F> 0, where r is the distance to the action point. Although F varies depending on the type of paper, it is set so as to satisfy the above-mentioned relational expression even when it is the largest value among the corresponding papers of the fixing device 22 and the copying machine. Further, as described later, the torque T is set to a size such that the exit side paper guide member 74 rotates when a jam occurs in the fixing device 22.

Next, the fixing operation and the jam clearing operation will be described. As shown in FIG. 12, the sheet P on which the image has been transferred by the image forming unit of the copying machine is fed from the entrance guide 90 opened in the lower frame 86 of the fixing device 22 to the fixing device 22.
And the image is fixed between the fixing roller 42 and the pressure roller 44 by heat and pressure. Normally, the sheet P on which the image is fixed is separated from the roller surface by the curvature of the fixing roller 42, and is discharged out of the fixing device 22 through an outlet formed by the upper frame 84 and the outlet-side sheet guide member 74. At this time, depending on the conveyance state of the paper P, the leading end of the thin paper or the like is discharged along the conveyance guide 84c (FIG. 4) formed by the upper frame 84 on the image side, and the paper P such as thick paper has a strong stiffness. The leading end is discharged along the exit side paper guide member 74 on the non-image side.

The exit side paper guide member 74 is rotatably supported by the upper frame 84. However, even when the paper P is discharged along the exit side paper guide member 74, as described above, the paper P is normally conveyed. The exit-side paper guide member 74 does not move due to the force of the paper P, and the conveyance of the paper P can be favorably guided. If the sheet P cannot be completely separated only by the curvature of the fixing roller 42, such as a sheet of thin paper or a sheet P on which many images are formed near the leading edge of the sheet, the sheet P is discharged so as to wind around the fixing roller 42 and fixed. The sheet is separated by a fixing separation claw 46 in contact with the roller 42.

In this case, for some reason, the tip of the fixing / separating claw 46 is worn, or the tip of the claw is floating from the surface of the fixing roller 42 due to a large amount of toner or the like accumulated at the tip of the claw. The leading edge may enter between the fixing separation claw 46 and the fixing roller 42 to cause a jam. Further, when a jam occurs downstream of the fixing device 22 during continuous copying, the succeeding sheet P may catch up with the preceding sheet P at the exit of the fixing device 22.

Since it takes a certain period of time from the occurrence of a jam to the stop of the apparatus, in the case of such a jam, as shown in FIG. At the exit of the sheet 22, the sheet P becomes bellows, and if the sheet length is short, such as A4 horizontal sheet passing, the sheet rear end may enter the fixing device 22. At this time, the sheet P is pressed over substantially the entire guide surface of the exit side paper guide member 74 while forming a bellows shape at the exit portion of the fixing device 22. This pressing force is greater than the force acting during normal transport. Since the position of the rotation fulcrum S of the exit-side paper guide member 74 is set as described above, the exit-side paper guide member 74 rotates in the opening direction due to the force of the paper P, and More space.

As a result, there is a space for the paper P to escape, so that the paper P is stopped in a state where it can be easily processed as compared with the conventional configuration in which the exit side paper guide member 74 is fixed. That is, the complicated entanglement of the jammed paper due to the absence of the escape space is greatly reduced. Fixing device 22
Exit side paper guide member 74 and paper transport guide member 76
Since the intersections are formed in a comb-teeth shape, a normal operation state where no jam occurs, that is,
Even when the right cover 80 is opened and the paper transport guide member 76 is not opened, there is no possibility that the exit side paper guide member 74 interferes with the paper transport guide member 76 and cannot be sufficiently opened.

To perform the jam processing, the right cover 80 of the copying machine main body and the sheet conveyance guide member 76 are opened, and the exit side sheet half opened by the pressing force of the jammed sheet from above the fixing device 22. Guide member 74 and fixing separation claw 46
The jam paper can be pulled out from between. When pulling out jammed paper, the exit side paper guide member 7
4 may be further rotated than the position rotated by the pressing force of the jammed paper, and the jammed paper can be pulled out by opening to the maximum. If the exit paper guide member 74 occupies the open position and the jammed paper is pulled out, it is possible to apply a force for holding the position of the exit paper guide member 74 by an operator's hand or the like. Not
Since the exit-side paper guide member 74 is held at that position, this operation can be easily performed.

If the exit side paper guide member 74 occupies the open position when the jammed paper is pulled out, the exit side paper guide member 74 holds the position at the open position even after the jammed paper is pulled out. Will remain
When the exit side paper guide member 74 does not hurt the operator when trying to return to the guide position, and when it is necessary to perform maintenance on the inside of the fixing device 22, the operator may move the exit side paper guide member 74 against the exit side paper guide member 74. The maintenance can be performed without applying force for holding the position by the hand or the like.

Immediately after the occurrence of a jam, the guide surface 74d side of the exit side paper guide member 74 becomes hot due to heat of the fixing device 22, but a plurality of ribs 74c are formed on the guide surface 74d as described above. Therefore, since heat is not easily transmitted to the operator's hand, there is no danger when the outlet side paper guide member 74 is rotated by hand. After the jammed paper is removed or after maintenance, if the exit side paper guide member 74 is rotated to a position where the corner 745c abuts on the leaf spring 92, the exit side paper guide member 74 is rotated by the torsion coil spring 88 and the plate. The spring 92 returns to the guide position by the urging force of the spring 92.

In the case where only the maintenance of the fixing device 22 is performed, the maintenance can be easily performed by rotating the exit side paper guide member 74 so as to occupy the open position as in the case of the occurrence of the jam. The maintenance of the fixing device 22 may be performed by removing the upper frame 84 from the lower frame 86. In this case, since the exit-side paper guide member 74 is attached to the upper frame 84, it can be detached as a single body, thereby improving maintainability.

Although the present invention has been described above, the position holding means may have another configuration. For example, the support portion does not necessarily have to have a shaft portion having a D-shaped cross section, may have a shaft portion having a polygonal shape, or may have a cylindrical shape by adjusting friction with an elastic member. It can also be a shaft. The guide member may be openable and closable, and the position holding means may be provided on the guide member side. The position holding means 91 is provided at the exit side paper guide member 74.
The main body may be disposed so as to correspond to one end of the fixing roller 42 in the axial direction.

[0042]

According to the first aspect of the present invention, a separating member for separating the sheet from the fixing roller pair, and the sheet separated from the fixing roller pair by the separating member provided opposite to the separating member. A guide member for guiding between the separation member and the guide member, the guide member is swingable,
In the fixing device, a guide position for guiding the sheet separated from the fixing roller with the separation member and an open position for opening a passage of the sheet separated from the fixing roller may be occupied. Since the guide member has position holding means for holding the position at the open position, once the guide member is set to the open position, the guide member is held at the open position. A further improved fixing device can be provided.

According to the second aspect of the present invention, in the fixing device according to the first aspect, the position holding means is provided on the guide member and supports the guide member main body in a swingable manner. Since it has the elastic member disposed on the fixing device main body side and engaged with the support portion, it is possible to provide a fixing device having position holding means having a relatively simple configuration.

According to a third aspect of the present invention, in the fixing device of the second aspect, the supporting portion has a shaft portion having a D-shaped cross section, and the guide member has an arc shape of the shaft portion. Since the position is held at the open position when the portion engages with the elastic member, the attitude of the guide member is determined by whether the arc-shaped portion of the shaft engages with the elastic member. It is possible to provide a fixing device that can be positioned at one of the positions.

According to a fourth aspect of the present invention, in the fixing device according to any one of the first to third aspects, there is provided an urging means for urging the guide member in a direction occupying the guide position. Therefore, it is possible to provide a fixing device that can apply a biasing force in a certain direction to the guide member.

According to the fifth aspect of the present invention, in the fixing device according to any one of the first to fourth aspects, the receiving portion provided on the fixing device main body side and the guide member are provided. The guide member occupies the guide position by engaging the received portion with the received portion. The guide member occupies the guide position. A fixing device that can be held can be provided.

The invention according to claim 6 is the invention according to claims 1 to 6
Since the image forming apparatus includes the fixing device according to any one of the above, it is possible to provide an image forming apparatus including the fixing device having each of the above-described effects.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a copying machine as an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic front view of the vicinity of a substantially vertical transport path of the copying machine shown in FIG.

FIG. 3 is a schematic front view of the copier in a state where a right cover and a sheet conveyance guide member are opened.

FIG. 4 is an exploded perspective view of the fixing device.

FIG. 5 is an enlarged perspective view of a main part of an upper frame and an exit side paper guide member.

FIG. 6 is a schematic front sectional view of the fixing device, showing a state in which an exit side paper guide member is at a predetermined position.

FIGS. 7A and 7B are diagrams showing a relationship between an outlet-side paper guide member of the fixing device and a paper conveyance guide member located downstream of the fixing device, wherein FIG. 7A is a schematic front view and FIG. 7B is a schematic side view.

FIG. 8 is a schematic front sectional view of a fixing device showing a position holding unit, showing a state in which an exit side paper guide member occupies a guide position.

FIG. 9 is a schematic front sectional view of the fixing device, showing a state in which the exit side paper guide member is in a state of returning to an open position.

FIG. 10 is a schematic front sectional view of the fixing device, showing a state in which an exit side paper guide member occupies an open position.

FIG. 11 is a schematic front sectional view of the fixing device in a state where an exit side paper guide member is at an open position.

FIG. 12 is a schematic front cross-sectional view of the fixing device, illustrating a torque generated by an urging unit of an outlet-side paper guide member.

FIG. 13 is a schematic front sectional view of the fixing device, showing a state of displacement of an exit-side paper guide member caused by paper when a jam occurs.

[Explanation of symbols]

 Reference Signs List 22 fixing device 45 fixing roller pair 46 separating member 74 guide member 74a supporting portion 74b receiving portion 75 shaft portion 75b arcuate portion of shaft portion 84a receiving portion 88 biasing means 91 position holding means 92 elastic member 100 image forming apparatus

Claims (6)

[Claims] A separating member that separates the sheet from the pair of fixing rollers, and a guide that is provided to face the separating member and guides the sheet separated from the pair of fixing rollers by the separating member. A guide position for guiding the sheet separated from the fixing roller between the separation member and the guide member, and a path for the sheet separated from the fixing roller. A fixing device capable of occupying an open position to be opened, comprising a position holding unit for holding the position of the guide member at the open position. 2. The fixing device according to claim 1, wherein the position holding means is provided on the fixing member main body, and a support portion provided on the guide member for supporting the guide member main body in a swingable manner. And a resilient member engaged with the supporting portion. 3. The fixing device according to claim 2, wherein the support portion has a shaft portion having a D-shaped cross section, and the guide member has an arc-shaped portion of the shaft portion engaged with the elastic member. The fixing device is held at the open position when the fixing device is operated. 4. The fixing device according to claim 1, further comprising: urging means for urging the guide member in a direction occupying the guide position. 5. The fixing device according to claim 1, wherein a receiving portion disposed on the fixing device main body side and a receiving portion disposed on the guide member and engaged with the receiving portion. A fixing device having a receiving portion, wherein the guide member occupies the guide position when the receiving portion is engaged with the received portion. 6. An image forming apparatus comprising the fixing device according to claim 1.