JPH0442280A - Image forming device - Google Patents

Abstract

PURPOSE:To easily remove the sheet of clogged paper in paired fixing roller parts by turning the paired fixing rollers while being interlocked with the operation of opening / closing a paper sheet discharging path on the downstream sides of the paired fixing rollers. CONSTITUTION:Between an opening / closing means 26 and paired fixing rollers 5 and 6, a linking means 18 is provided to link the opening / closing means 26 with the paired fixing rollers 5 and 6. When the sheet of paper P is clogged in the paired fixing rollers 5 and 6, a paper sheet conveying path T is opened by the opening / closing means 26 away from the paired fixing rollers 5 and 6 and, this opening operation is transmitted to the paired fixing rollers 5 and 6 by the linking means 18 so as to feed the sheet of clogged paper P in a discharging direction. Thus, since the sheet of the paper P clogged at the paired fixing rollers 5 and 6 is automatically discharged to a discharge side by the operation of opening the paper sheet discharging path T, the operation of removing the sheet of the clogged paper P is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to image forming apparatuses such as copying machines and laser beam printers, and more particularly to a fixing device for fixing toner images on paper.

(B) Conventional Technology Conventionally, in a heating type fixing device in an image forming apparatus such as an electrophotographic copying machine, copy paper (hereinafter referred to as paper) on which a toner image is fixed between a pair of fixing rollers may jam. In some cases, the fixing device can be pulled out from the main body of the copying machine in order to take out the paper from the fixing section. However, it is very common to have to pull out the fixing device from the copying machine every time a paper jam occurs. If it can rotate, it will be convenient because you can easily remove jammed paper.

However, in conventional devices, when a paper jam occurs, the drive source of the copying machine is in a stopped state, and the fixing roller pair, which is connected to the drive source via a gear, is manually rotated. If you try to do so, the stopped driving source will also be rotated, which will impose a heavy load and make it difficult to remove the paper.

To solve this problem, a mechanism is known in which a one-way rotational clutch is interposed between the pair of fixing rollers and the drive source section (for example, Japanese Utility Model Application No. 118634/1983). With this configuration of the fixing device, when a paper jam occurs, the drive source is disconnected from the drive source in the direction in which the jammed paper is fed out by the action of the one-way rotation clutch, so the fixing roller pair is lightly moved. It can be rotated and paper can be easily taken out.

However, even if the fixing device is configured with a one-way rotation clutch, when the user removes jammed paper, the fixing roller pair is moved in the opposite direction to the paper feeding direction, that is, in the reverse direction of the fixing roller pair. If manual rotation is attempted, the drive source will also be reversed, and there is a risk that attached parts such as various clutches, plates, or photosensitive drums connected to the drive source may be destroyed.

In order to eliminate this drawback, a fixing device having a configuration as shown in FIG. 5 (Japanese Utility Model Publication No. 31060/1983) has been proposed.

In the figure, a support shaft 8 to which a fixing roller 81 is fixed is shown.
3 is rotatably supported by a pair of side plates 85 and 86 in the direction of the arrow, and a pressure roller 82 that is in pressure contact with this fixing roller 81 is also supported in the same way. A driven N-wheel 89 is attached to one extending portion 83a of the support shaft 83 via a one-way rotary clutch 87 on the drive side, and is back-connected to the drive side (not shown). A manual rotation knob 9 is connected to the extension portion of the other side of the support shaft 83 via a one-way rotation clutch 91 on the manual side.
2 are installed.

The one-way rotation clutch 87 transmits the rotation from the driven gear 89 to the fixing roller 81, but is set so that when the fixing roller 81 side rotates forward in the direction of the arrow, it is in a free state and the driven gear 89 stops. ing. Further, the other one-way rotation clutch 91 transmits the rotation in the direction of the arrow by the manual rotation knob 92 to the fixing roller 81.
It is in a free state for rotation from the 1st side.

With this configuration of the fixing device, when paper (not shown) jams, rotating the manual rotation knob 92 in the forward rotation direction (in the direction of the arrow) rotates the fixing roller 81 in the forward direction and clears the paper jam. When the manual rotation knob 92 is rotated in a direction in which the fixing roller 81 rotates in the opposite direction of the arrow, the manual rotation knob 92 is rotated by the action of the one-way rotation clutch 91. 9
The rotational force of No. 2 is not transmitted to the fixing roller 81 and is transmitted to the driven gear 8.
9, that is, the reverse rotation of the drive source (not shown), the drive system accessories can be safely protected.

Furthermore, among image forming apparatuses having the fixing device as described above, an apparatus having a main body configuration as shown in FIG. 6 is well known.

In the figure, a device main body 90 of a copying machine (image forming device)
The above-described fixing roller 81 and a driven roller 82 in pressure contact with the fixing roller 81 are arranged to rotate in the directions of the arrows. In an image forming section (not shown), the paper P on which the toner image has been transferred is guided by a guide member 93 in the six directions of arrows, and is conveyed to a pair of fixing rollers consisting of a fixing roller 81 and a driven roller 82, where the toner image is fixed.

On the downstream side of the pair of fixing rollers 81 and 82, there is a fixing roller 81 that prevents the paper P from wrapping around the fixing roller 81.
A separating claw 95, a pair of guide plates 96, and a pair of ejection rollers 97 are provided, respectively. Ejection unit 9
9 is rotatably supported by a support shaft 100 with respect to the device main body 90, and is rotatable between an operating position (closed position) shown in FIG. 6(a) and a retracted position shown in FIG. 6(b). The discharge unit 99 includes the above-mentioned separating claw 95, a pair of guide plates 96, a pair of discharge rollers 97, and the like. The pair of guide plates 96, the pair of discharge rollers 97, and the like constitute a discharge path T through which the sheet P after fixing is conveyed.

If the paper P jams in the fixing roller pair 81.82, operate the manual rotation knob 92 explained in FIG. 5 to rotate the fixing roller pair 81.82 in the jammed paper ejection direction. The jammed paper is removed by When removing the jammed paper, the separating claw 95, the pair of ejection rollers 97, and the like are in the way of ejecting the jammed paper.

For this reason, conventionally, when dealing with a paper jam that occurs in a copying machine, the ejection units 1 to 99, each having a separation claw 95, a pair of ejection rollers 97, etc., are placed against the apparatus main body 90 as shown in FIG. 6(b). After rotating to the open retracted position, the jammed paper is ejected by operating the manual rotation knob 92 and thereby rotating the pair of fixing rollers 81 and 82 according to the operating procedure described above.

(C) Problems to be Solved by the Invention However, the conventional fixing device described above has the following problems.

(1) If a paper jam occurs immediately after the paper P is caught in the nip between the pair of fixing rollers 81 and 82, and the drive source of the apparatus main body 90 stops, move the ejection units 1 to 99 to the evacuation position. Even if the jammed paper P is opened, it may be difficult to find the jammed paper P. After all, it was only after the manual rotation knob 92 was operated and the paper P began to be ejected that the leading edge of the paper P was found to be caught between the pair of fixing rollers 81 and 82.
It takes time to eject paper P.

(2) If the drive source stops with the leading edge of the paper P being caught in the nip of the pair of fixing rollers 81 and 82 as in (1) above, for example, if the size of the jammed paper P is If the paper is A3, the manual rotation knob 92 must be continuously operated for a distance equivalent to the A3 size, which takes time and effort to eject the paper P.

(3) When the user actually ejects the paper P that is caught between the nip portions of the pair of fixing rollers 81 and 82, the user operates the manual rotation knob 92 according to the above-mentioned operating procedure.
．． In addition to rotating the pair of fixing rollers 81 and 82, the paper P protruding from the pair of fixing rollers 81 and 82 toward the paper output side may be directly grasped and pulled out by hand.

There are some copying machines that eliminate the manual rotation knob 92 in anticipation of this operation, but in the case of such copying machines,
99 toward the ejection unit 1 is opened, and the paper P is attached to the fixing roller pair 81.8 long enough for the paper P to be grasped by hand.
It is necessary that it protrudes from the nip part of 2,
As described in (1) and (2) above, if the drive source stops immediately after the leading edge of the paper P is caught in the nip of the pair of fixing rollers 81°82, the jammed paper P It is impossible for the user to grasp it by hand.

Therefore, the present invention allows the fixing roller pair to rotate in conjunction with the opening/closing operation of the paper discharge path on the downstream side of the fixing roller pair, thereby facilitating the removal of paper jammed in the fixing roller pair portion. The object of the present invention is to provide an image forming apparatus that is capable of achieving a high level of performance.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, referring to FIGS. Fix the toner image by applying pressure 1
A pair of fixing rollers (5°6) and a pair of fixing rollers (5°6).
, 6), and an opening/closing means (26) for opening and closing a paper discharge path (T) through which the fixed paper (P) is conveyed. ,
The connecting means (18) connecting the opening/closing means (26) and the pair of fixing rollers (5, 6) is connected to the opening/closing means (26).
and provided between the pair of fixing rollers (5°6).

Further, the fixing roller pair (5, 6) and the drive source (12
), which transmits rotation in only one direction, and a second transmission means (23), which is provided in the connecting means (18), and which transmits rotation in only one direction. )
It has the following.

Further, the connecting means (18) may be connected to the paper conveyance path (T).
It is provided at the center of rotation of a paper discharge unit (3) having a.

(e) Function Based on the above configuration, when normal fixing is performed using the fixing roller pair (5, 6), the paper transport path (T) is located on the side of the fixing roller pair (5, 6). and paper (P
) is a pair of fixing rollers (5) rotated by a drive source (12).
, 6), and then discharged through the paper transport path (T).

If the paper (P) jams in the fixing roller pair (5, 6), the paper transport path (T)
) is opened by the opening/closing means (26), and this opening operation is transmitted to the pair of fixing rollers (5, 6) by the connecting means (18), and the jammed paper (P) is sent out in the ejection direction. It will be done.

When manually removing jammed paper, the rotation of the pair of fixing rollers (5, 6) is not transmitted to the drive source (12) due to the action of the first transmission means (15), thereby removing the jammed paper. Withdrawals are made easily.

Further, when the opened paper ejection path (T) is rotated in a direction to close it to the paper ejection possible position, the second transmission means (25
), the rotation of the paper discharge path (T) is not transmitted to the pair of fixing rollers (5, 6) and the drive source (12). That is, the rotation of the drive source (12) during fixing of paper is transmitted only to the pair of fixing rollers (5, 6), and is transmitted to the paper ejection unit (3) by the action of the second transmission means (25). It is designed so that it will not happen.

Note that the above-mentioned symbols in parentheses are used to refer to the drawings, and do not limit the structure of the present invention in any way.

(F) Example A first example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a schematic perspective view of a first embodiment of the present invention, and FIG. 2 is a view taken along arrow C in FIG. 1. In the figure, support shafts 9 to which the fixing roller 5 is fixed are rotatably supported by the side plates of the apparatus main body 2, and an input gear 10 is fixed to one end of the support shaft 9. The pressure roller 6, which is in pressure contact with the fixing roller 5 by a biasing means (not shown), is rotatably mounted on the apparatus main body 2 by a support shaft 7a.

A drive gear 11 that rotates in the direction of the arrow is fixed to a support shaft 11a that is connected to a drive source 12. An intermediate gear 13 that meshes with this drive gear 11 rotates in one direction. It is attached to a support shaft 16 via a transmission means (1) 15. The one-way rotation clutch 15 is connected to the intermediate gear 1
When the gear 3 rotates in the direction of the arrow 20, it is in a locked state and transmits the rotation of the intermediate gear 13 to the support shaft 16, and when the support shaft 16 rotates in the opposite direction of the arrow 20, it is in a free state so that no rotation is transmitted. It has become. The support shaft 16 is rotatably supported by the device main body 2 via a bearing 17, and an intermediate gear 19 is integrally formed with the support shaft 16.
is meshed with the input cap 10.

A coupling means 18 is constituted by the one-way rotation clutch 15, manual gear 23, and the like.

Inside the paper ejection unit 3, there are a plurality of separation claws 29 for separating the paper P after the toner images 1 to 1 have been fixed, and a paper ejection roller pair 30 consisting of a drive roller 30a and a driven roller 30b that is in pressure contact with this and rotates as a result of the drive roller 30a. are arranged respectively. An input gear 33 is fixed to one end of the support shaft 31 to which the drive roller 30a is fixed, and this manual gear 33 rotates in the direction of the arrow via an intermediate gear 35 when the paper discharge motor 36 rotates. A pair of guide plates (not shown) provided on the downstream side of the pair of fixing rollers 5 and 6, a pair of paper ejecting rollers 30, etc.
A paper discharge path T is configured in which the paper P after the toner image is fixed is transported.

The above-mentioned paper ejection unit 3 has a support shaft (
(opening/closing means) 26. Further, the input gear 10 integrated with the fixing roller 5 is connected to a manual gear 23 via intermediate gears 21 and 22.
is attached to the support shaft 26 via a one-way rotation clutch 25.

When the manual gear 23 rotates in the direction of the arrow, the one-way rotation clutch 25 freely rotates in one direction, and the rotation is caused by the support shaft 26.
When the rotation is rotated in the direction of arrow 24, the rotation is locked and transmitted to the support shaft 26. In other words, when the support shaft 26 integrated with the paper ejection unit 3 rotates in the direction opposite to the arrow 24 (the direction indicated by the arrow in FIG. 2),
The rotation is transmitted to the manual gear 23.

The paper ejection unit 3 is separated from the main body 2 by the double chain line and can be rotated, and when the paper P is normally fixed, it is in an upright operating position as shown in Figures 1 and 2. (
When removing a jammed paper, it is opened in the direction of the arrow as shown in FIG. 2 and operated by the user to the retracted position 3A.

In the fixing device configured as described above, the operation of the fixing section during normal copying will be described first. When the drive source 12 operates, the drive gear 11 rotates in the direction of the arrow, causing the intermediate gear 13 to rotate in the direction of the arrow. In addition,
Rotation by the drive source is indicated by an unsigned arrow in the figure. The rotation of the intermediate gear 13 in the direction of the arrow is transmitted via the intermediate gear 13 to the support shaft 16 and the intermediate gear 19 integrated therewith, and the input gear 10 meshing with the intermediate gear 19 rotates in the direction of the arrow.

The rotation of the input gear 10 causes the fixing roller 5 integrated with the input gear 10 and the pressure roller 6 driven by the fixing roller 5 to rotate in the directions of the arrows. After fixing the toner images 1 to 1, the sheet P is fixed with one hender image by the pair of fixing rollers 5 and 6, and is then conveyed from the fixing section 7 to the pair of discharge rollers 30 while being separated by the separating claw 29, and then transported to the device. It is discharged outside.

On the other hand, when the input gear 10 rotates, the intermediate gear 21.22
The manual gear 23 rotates in the direction of the arrow. Since the one-way rotation clutch 25 only rotates in one direction when the manual gear 23 rotates in the direction of the arrow, the rotation of the manual gear 23 is not transmitted to the support shaft 26 and the manual gear 23 simply rotates idly.

Next, immediately after the paper P is sandwiched between the pair of fixing rollers 5 and 6, a paper jam occurs, and when this paper jam is detected by a detection means (not shown), the operation of the drive source 12 is stopped. .

To remove the jammed paper P, the paper ejection unit 3 and the supporting shaft 26 integrated therewith are rotated in the direction of the arrow in FIG.
9, the paper ejection roller pair 30, etc. are also rotated in the same direction.

The one-way rotation clutch 25 between the support shaft 26 and the manual gear 23 rotates when the manual gear 23 rotates in the direction of the arrow 24, that is, when the support shaft 26 is released in the direction of the arrow together with the paper discharge unit I-3. As mentioned above, since it acts in the locking direction, when the paper discharge unit 3 is opened, the manual gear 23
rotates in the direction of the unsigned arrow. The rotation of the manual gear 23 is transmitted to the input gear 10 via the intermediate gear 22.21, and the input gear 10 and the fixing roller 5 integrated therewith rotate in the direction of the arrow. In other words, when the paper ejection unit 3 is rotated in the direction of the arrow to open, the pair of fixing rollers 5 and 6 are rotated in the direction of the arrow in conjunction with this, and the paper whose leading edge was held in its mouth is removed. P is automatically sent out in the discharge direction.

Further, the rotation of the input gear 10 due to the rotation of the manual gear 23 is transmitted to the intermediate gear 19 and the support shaft 16 connected thereto, and these rotate in the directions of the arrows. When the support shaft 16 rotates in the direction of the arrow, the latch 1 rotates in one direction.
5 is in one direction, the rotation of the support shaft 16 is not transmitted to the intermediate gear 13, and only the support shaft 16 rotates idly. Therefore, the drive source 12 connected to the intermediate gear 13
is not driven despite the rotation of the pair of fixing rollers 5 and 6 in the direction of the arrow.

As described above, when the paper P jams and the drive source 12 stops with the leading end being sandwiched between the pair of fixing rollers 5 and 6, the paper ejection unit 3 is released by the user. By appropriately rotating the pair of fixing rollers 5 and 6 in conjunction with this opening operation, the paper P is ejected for a certain length in the paper ejection direction, and the user can grasp the edge of the paper P. The jammed paper P is removed by further pulling out the paper P in the paper discharge direction.

When removing the paper P, the rotation of the manual gear 23 is not transmitted to the upstream side of the intermediate gear 13 of the drive transmission system due to the action of the one-way rotation clutch 15, so the action of pulling out the paper P can be easily performed. In addition, since the drive source 12 is prevented from reversing, damage to the parts attached to the drive source due to reverse rotation does not occur.

Next, a case will be described in which the paper ejection unit 3 is returned to its original operating position (obstruction value W) after the ejection process of the jammed paper P. When the paper discharge unit 3 is rotated in the opposite direction of the arrow in FIG. 2, the support shaft 26 integrated therewith also rotates in the same direction. During this rotation, the one-way rotation clutch 25 is in one direction, and the rotation of the support shaft 26 is not transmitted to the manual gear 23, and the support shaft 26 simply rotates idly. As a result, when the paper ejection units 1 to 3 are closed, the fixing roller pair 5.
The drive source including the drive source 12 as well as the drive source 6 includes a support shaft 26.
can be closed without any influence of rotation.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the figure, the main body 2 of the image forming apparatus 1 has a so-called alligator shape that can be divided into upper and lower parts and can be opened and closed, and the upper main body 2a is configured to be freely rotatable about a support shaft 41. The upper body 2a has a photosensitive drum 40 on the circumferential surface of which a toner image is formed by a well-known electrophotographic method, and when the upper body 2a is closed, a transfer charger 46 and a separation charger are installed below the photosensitive drum 40. The containers 47 are facing each other.

Paper P in the paper feed cassette 42 provided in the lower main body 2b
(See FIG. 3) is sent out by the rotation of the paper feed roller 43, and further fed to the photosensitive tram 40 by the registration roller 45 at a predetermined timing. Photosensitive drum 40
Paper P on which the upper toner image has been transferred by the transfer charger 46
is separated from the photosensitive drum 40 by a separation charger 47, and is transported by a transport section 49 to a pair of fixing rollers 5 and 6. On the downstream side of the fixing roller 5, a separation claw 29 for separating the paper P from the fixing roller 5 and a pair of paper discharge rollers 30 are arranged in this order.

The support shaft 55 is rotatably attached to the device main body 2 by a pair of bearings 57, and a driven gear 59 integrated with the support shaft 55
is a drive gear (path shown) connected to a drive source (not shown)
It meshes with the The input gear 59 and the support shaft 55 each rotate in the direction of an unsigned arrow when the drive source is operated, and hereinafter, unsigned arrows indicate the rotation direction of the parts when the drive source is operated.

An intermediate gear 52 is attached to the support shaft 55 via a one-way rotation clutch (first transmission means) 53, and this intermediate gear 52 meshes with the input gear 10 that is integrated with the fixing roller 5. The one-way rotation clutch 53 has an intermediate gear 52
When the spindle 55 rotates in the direction of arrow 56, that is, when the spindle 55 relatively rotates in the direction opposite to the arrow 56, the locking direction is reached.Therefore, when the drive source is activated, the rotation of the spindle 55 is caused by the rotation of the one-way rotation clutch 53. is transmitted to the intermediate gear 52 via the intermediate gear 52, and the intermediate gear 52 rotates in the direction of the arrow.

A gear 60 is fixed to the other end of the support shaft 9 that is integral with the fixing roller 5, and a gear 62 that meshes with this gear 6o is integrally connected to the support shaft 61 that is attached to the main body 2 of the apparatus by a bearing 63. It is configured. A manual gear 65 is attached to the support shaft 61.
The rack 69, which is attached via a one-way rotary clutch (second transmission means) 66 and in which this manual gear 65 is engaged, is guided to the lower body 2b by a guide member 7o so as to be movable up and down. is pivotally attached to the upper main body 2a as shown in FIG.

The coupling means 18 is constituted by the one-way rotation clutch 66, the manual gear 65, the rack 69 for driving the same, and the like.

In the one-way rotation clutch 66, the manual gear 65 is connected to the arrow 6
When rotating in the 7 directions, the one-way rotation clutch 66 is in a locked state and the rotation is transmitted to the support shaft 61, and when the support shaft 61 integrated with the gear 62 rotates in the direction of the arrow, the one-way rotation clutch 66 is in a free one-way state. The manual gear 65 remains stationary and only the support shaft 61 rotates idly.

First, during a normal copy operation, when a driving force is applied to the input gear 59 by the operation of a drive source (not shown) and the support shaft 55 integrated with the gear 59 rotates in the direction, the one-way rotation clutch 53 is moved in the locking direction. Since the intermediate gear 52 is located in the direction of the arrow (
rotate in the same direction). As a result, the input gear 10 and the fixing roller 5 integrated therewith rotate in the direction of the arrow to fix the paper P on which the toner image has been transferred and discharge it.

When the fixing roller 5 and the gear 60 integral therewith rotate in the direction of the arrow, the gear 62 and the support shaft 61 integral therewith rotate in the direction of the arrow. When the support shaft 6 is rotating, the one-way rotation clutch 66 is in one direction, so the manual gear 65 remains stopped and only the support shaft 61 idles.

Next, a case where a paper jam occurs immediately after the paper P is sandwiched between the pair of fixing rollers 5 and 6 will be described. When a paper jam occurs, this is detected by a detection means (not shown) and the drive source is stopped. Thereafter, in order to dispose of the jammed paper P, the upper main body 2a is rotated in the direction of the arrow F about the support shaft 41 as shown in FIG. 4 by the user's operation.

As the upper body 2a rotates, the rack 69 is moved to one side as shown in the figure, and this movement causes the manual gear 65 to rotate in the direction of the arrow 67. Since the rotation direction of the manual gear 65 is the direction in which it is locked with the one-way rotating Kura Sochi 66, the support shaft 61 is rotated together with the manual gear 65 in the direction of the arrow. When the support shaft 61 and the gear 62 integrated therewith rotate in the direction of the arrow, the fixing roller 5 rotates in the direction of the arrow, and the jammed paper P is not sent out by an appropriate length in the discharge direction.

When the pair of fixing rollers 5 and 6 rotate as described above, the input gear 10 on the rear side of the apparatus main body 2, that is, on the drive source side, also rotates in the direction of the arrow, but the rotation from the intermediate gear 52 at this time is unidirectional rotation. Since the clutch 53 is not locked, the support shaft 55 is not driven. That is, the upper main body 2a
The rotation of the pair of fixing rollers 5 and 6 caused by the release of the fixing rollers 5 and 6 is transmitted to the one-way rotation clutch 53, and does not affect the drive system upstream from the one-way rotation clutch 53. Thereby, the action of manually pulling out and removing the jammed paper P can be easily performed without being subjected to any load from the drive system.

Further, when the rack 69 is lowered due to blockage of the upper body 2a, the manual gear 65 rotates in the opposite direction of the arrow 67, but this rotation of the manual gear 65 is supported because the one-way rotation clutch 66 is in one direction without locking. The shaft 61 and the gear 62 integrated therewith do not rotate, so that the influence of the rotation is also avoided on the fixing roller pair 5, 6 and the drive system on the two-liquid side.

(G) As described in detail, according to the present invention, means is provided for making the pair of fixing rollers rotatable in the paper ejection direction in conjunction with the opening/closing operation of the paper ejection path on the downstream side of the pair of fixing rollers. As a result, paper jammed in the pair of fixing rollers is automatically ejected to the ejection side as the paper ejection path opens and closes, making it easier to remove jammed paper and clear jammed paper. Improves operability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a fixing device section of an image forming apparatus showing a first embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an image showing a second embodiment of the present invention. FIG. 4 is a side view of an image forming apparatus to which the fixing device is also applied, FIG. 5 is a longitudinal sectional front view showing the main parts of a conventional fixing device, and FIG. 6 is a perspective view of the fixing device section of the forming device. FIG. 3 is a side view of a paper ejecting section of an image forming apparatus to which the above fixing device is applied. P...paper, T...paper ejection path for fixed paper,
1... Image forming apparatus, 2... Apparatus main body 3...
Paper ejection unit I-5, 6... Fixing roller pair, 5... Fixing roller 6... Pressure roller 12... Drive source
, 10... input gear 11... drive gear, 15...
...One-way rotation clutch, 23...Manual gear, 25.
...One-way rotation clutch, 30... Paper ejection roller pair,
2a... Upper body 52... Intermediate gear, 53 One-way rotation clutch, 5... Manual gear, 6... One-way rotation clutch, 9... Rack

Claims (1)

[Scope of Claims] 1. A pair of fixing rollers that fixes the toner image by pressing the paper onto which the toner image has been transferred, a drive source that drives the pair of fixing rollers, and a drive source that drives the pair of fixing rollers, and the paper after the fixation. An image forming apparatus comprising an opening/closing means for opening/closing a conveyed paper discharge path, further comprising: a connecting means for connecting the opening/closing means and the pair of fixing rollers, provided between the opening/closing means and the pair of fixing rollers. Features of the image forming device. 2. A first transmission means for transmitting rotation in only one direction, provided between the pair of fixing rollers and the drive source; and a second transmission means for transmitting rotation in only one direction, provided in the connection means. The image forming apparatus according to claim 1, further comprising: means. 3. Claim 1, wherein the connecting means is provided at a rotation center of a paper discharge unit having the paper transport path.
The image forming apparatus described above. 4. The image forming apparatus according to claim 1, wherein the connecting means includes a rack.