JPH0887227A - Image forming device - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the actual occupied area and facilitate jam handling work. At least a conveying unit 20 that conveys a sheet material after image formation, a fixing unit 30 that fixes an image of the sheet material after image formation onto a sheet surface, and the fixing unit 30
The sheet material fixed by the image forming apparatus main body 1
In the image forming apparatus having a sheet discharging unit 40 for discharging the sheet to the outside, a component including the conveying unit 20, the fixing unit 30, and the sheet discharging unit 40 is a member 11 in the image forming apparatus main body 1. It is characterized in that it is configured as described above and that the component unit 10 can be attached to and detached from the front side of the image forming apparatus body 1 to the outside of the image forming apparatus body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer and a facsimile.

[0002]

[Prior art]

<Prior Art 1> FIG. 11 shows an example of a conventional image forming apparatus. Reference numeral 100 denotes an image forming apparatus main body.

In the figure, 101 is a document table on which a document is placed.
102 is a document illumination lamp for displaying the image of the document on a mirror,
Reference numeral 103 denotes a photosensitive drum that carries an image of an original, 104 to 10
Reference numeral 9 is a mirror for forming an electrostatic latent image by forming an image of a document on the photosensitive drum 103, and 110 is an image forming lens (zoom lens).

Reference numeral 111 is a primary charger for uniformly charging the photosensitive drum 103 before image formation, 112 is a pre-exposure lamp for erasing residual charges on the photosensitive drum 103 before primary charging, and 113 is a non-exposure lamp. A blank exposure lamp that removes the surface charge of the photosensitive drum 103 in the copy section and prevents excess toner from adhering to the photosensitive drum 103, and 114 attaches toner to the electrostatic latent image formed on the photosensitive drum 103. A developing device for forming a toner image by the above, 115 is a pre-transfer charger for making the electric charge of the toner formed on the photosensitive drum 103 proper, and further eliminating the excessive electric charge on the surface of the photosensitive drum 103.
Reference numeral 16 denotes a transfer / separation charger that transfers the toner image formed on the photosensitive drum 103 to the sheet P which is a sheet material, and separates the sheet P having the toner image from the photosensitive drum 103.
Reference numeral 117 denotes a separation claw portion that forcibly separates the sheet P such as defective separation from the photosensitive drum 103, and 118 denotes a cleaner portion that collects toner that is no longer needed after transfer.

The sheet P stored in a cassette (not shown) is taken out by a paper feed roller (not shown), and is registered at a predetermined timing in synchronization with the toner image (image) on the photosensitive drum 103 by a pair of registration rollers 119. The toner images are sent out and the toner development images are sequentially transferred to the first surface of the sheet P by the transfer charger 116a.

The sheet P which has received the image transfer is separated by a charger 1.
16b and the separating claw 117 sequentially separates from the drum surface of the photosensitive drum 103, and feeds it to the fixing device 121 including the cleaning web 121a, the fixing roller 121b, and the pressure roller 121c via the conveying unit 120.

Therefore, the transferred image on the sheet P is permanently fixed.

Next, the sheet P is sent to the first paper discharge roller pair 122, passes through the upper edge of the flapper 123 (paper discharge conveyance path 140A), and is discharged from the second paper discharge roller pair 124 to a tray outside the apparatus (see FIG. It is discharged to (not shown) (single-sided function).

Photosensitive drum 103 after the toner image is transferred
Passes through the position of the cleaner unit 118 to be removed of unnecessary toner after transfer, and is then subjected to light irradiation by the pre-exposure lamp 112 to be removed of surface charge, and the primary charger 111 is again provided. By receiving the uniform charging due to, it becomes possible to repeatedly form an image. When the image is formed again on the same surface as the surface on which the first surface is imaged (multi-function), the flapper 123 guides the sheet P to the discharge conveyance path 140C and passes through the lower conveyance entrance 125. It is stored in the lower transport 126. Also, when an image is formed on the second surface opposite to the first surface (double-sided function)
After the sheet P is partially discharged by the second pair of discharge rollers 124, the second pair of discharge rollers 124 is reversed, and the flapper 123 guides the sheet P to the discharge conveyance path 140B. Store in 126.

The sheet P stored in the lower conveyance 126 is re-fed by the re-feed roller pair 127, and is fed by the registration roller pair 119 at a predetermined timing synchronized with the image on the photosensitive drum 103. Tray (not shown) outside the device in the same process as image formation
Is discharged to.

Conventionally, the registration roller pair 119, the pre-transfer upper and lower guides 130, the conveying section 120, the fixing unit 121, and the sheet discharge section 140 including the first and second sheet discharge roller pairs 122 and 124 are the image forming apparatus. It is fixedly installed on the main body 100.

The image forming apparatus main body 10 of such a conventional example.
0, the fixing device 121 and the first and second paper discharge roller pair 1
When a jam occurs in the portion of the sheet discharge / conveyance paths 140A to 140C composed of 22, 124, flapper 123, etc., as shown in FIG. 12, the sorter (not shown) is separated from the image forming apparatus main body 100 ( (A moving in the direction of arrow A in the figure), and a paper discharge unit 140 that can be opened and closed centering around the support shaft 141
Is opened (rotated in the direction of arrow B in the figure) to remove the sheet P retained in the fixing device 121 and the paper discharge unit 140.

When a jam occurs in the registration roller pair 119 and the transfer / separation charger 116, a support shaft (not shown) having a transport pressure arm 131 is provided in front of the image forming apparatus main body 100. By tilting the provided conveyance section release lever (not shown) in the counterclockwise direction, it is separated from the photosensitive drum 103 of FIGS. 12 to 13, and the knob (not shown) provided on the registration roller pair 119 is turned to the opposite side. The jammed sheet P is removed from the direction of the transport unit 120 by rotating clockwise.

In this case, the registration roller pair 119, the pre-transfer upper and lower guides 130, the conveying section 120, etc. are fixedly installed in the image forming apparatus main body 100, so that the jam forming process is performed inside the image forming apparatus main body 100. It was difficult to visually find the sheet P of No.

Further, since the user puts his / her hand in the image forming apparatus main body 100 to remove the jam, the photosensitive drum 103
There is a risk of soiling or scratching the surface.

In the conventional image forming apparatus main body 100, cleaning is performed when the conveying surface of the sheet P of the pre-transfer upper and lower guides 130, the roller surface of the registration roller pair 119, the upper surface of the conveying portion 120 and the like are contaminated with toner or the like. , Image forming apparatus main body 1
It is more difficult to reach the inside (back side) of 00, and if the leakage of cleaning occurs, the back surface of the sheet P may be soiled.

Further, the registration roller pair 119 and the conveying section 12
When the 0 transport belt (see FIGS. 12 and 13) is replaced, the peripheral drive system (not shown) and the like must be removed in order to remove each component or unit from the inside of the image forming apparatus main body 100. Since it does not happen, the work was very troublesome.

When replacing the fixing roller 121b and the pressure roller 121c in the fixing device 121, a sorter (not shown) is separated from the image forming apparatus main body 100 as shown in FIG. 12 (in the direction of arrow A in the figure). (Moving), open the paper discharge unit 140 that can be opened and closed around the support shaft 141 (arrow B in the figure).
(Rotating in the direction), the fixing device 121 is attached to the image forming apparatus main body 100
Take out from inside and replace each part.

Further, the registration roller pair 119 is supported at both ends by front and rear side plates in the main body of the image forming apparatus 100 and is accurately positioned with respect to the photosensitive drum 130 so that there is no deviation of the bus bar. Inside fixing roller 12
1b and the first (inner) paper ejection roller pair 122 in the paper ejection unit 140
The second (outer) paper discharge roller pair 124 and the like are supported in each unit and are positioned in the image forming apparatus 100. Therefore, the stacking amount of the crossed parts becomes large between the rollers of each unit, and There was a deviation of the bus.

As a result, the skew of the sheet P and the fixing device 121
Invited paper wrinkles and jams. <Prior Art 2> Therefore, in an image forming apparatus such as a copying machine, a printer, or a facsimile, the image forming apparatus main body 100 according to the prior art 1 is provided for convenience of jam processing.
There is one in which the main parts incorporated inside are unitized and can be pulled out to the outside (front side) of the image forming apparatus main body 100.

For example, a conventional image forming apparatus (copier)
In the above, a fixing unit including a fixing device for fixing the transfer image of the sheet material after the toner image transfer onto the sheet surface,
A lower conveyance (double-sided) unit including an intermediate tray that temporarily stores and re-feeds the sheet material after image formation for image formation again can be pulled out of the copying machine main body.

Therefore, by pulling out the fixing unit and the double-sided unit to the outside of the main body of the image forming apparatus (copier), it is possible to easily take out the jammed sheet between the fixing unit and the double-sided unit.

In this case, in the conventional image forming apparatus (copying machine), the fixing unit and the double-sided unit are individually pulled out from the main body of the image forming apparatus (copying machine) and housed individually. ing.

[0024]

However, even in the image forming apparatus of the conventional example shown in the conventional technique 2 described above, the fixing device 121 and the first and second paper discharging roller pairs 122, 1 are provided.
24, a paper ejecting / conveying path 140 composed of a flapper 123 and the like
When a jam occurs in the portions A to 140C, separate the sorter (not shown) from the image forming apparatus main body 100,
In addition, since a space for opening the paper discharge unit 140 is required, there is a problem that the actual occupied area of the image forming apparatus becomes large.

Further, if each component unit (fixing unit, double-sided unit) shown in the above-mentioned conventional technique 2 is individually pulled out from the image forming apparatus main body or housed, the work for jam clearance is troublesome. There was a problem.

The present invention was made in order to solve the above-mentioned problems of the prior art, and its purpose is to:
An object of the present invention is to provide an image forming apparatus capable of reducing a substantial occupied area and facilitating jam processing work.

[0027]

To achieve the above object, in the present invention, at least a conveying means for conveying a sheet material after image formation and an image of the sheet material after image formation are provided. In the image forming apparatus, there is provided a fixing unit for fixing the sheet surface, and a sheet discharging unit for discharging the sheet material fixed by the fixing unit to the outside of the main body of the image forming apparatus. A component including a fixing unit, a fixing unit, and a sheet discharging unit is formed on one member in the image forming apparatus main body, and the component unit can be attached to and detached from the front side of the image forming apparatus main body to the outside of the image forming apparatus main body. It is characterized by

[0028]

In the image forming apparatus having the above structure, the component unit including at least the conveying means, the fixing means and the paper discharging means is integrally pulled out on one member inside the image forming apparatus main body. Only the accumulated sheet material can be removed. As a result, it is possible to easily find the sheet material that has accumulated in the transport means, the fixing means, and the paper discharge means, and to eliminate the need for a space for removing the sheet material, and to reduce the actual occupied area.

Further, since the component unit can be pulled out of the main body of the image forming apparatus, it is easy to assemble, disassemble, and clean the component unit including each means.

Further, on one member in the main body of the image forming apparatus,
Since the conveying means, the fixing means, and the paper discharging means are integrally provided, the positions between them can be accurately obtained. In particular, the roller pair in each means has a smaller deviation of the generatrix as compared with the conventional example, so that skew of the sheet material and paper wrinkles in the fixing means are reduced.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 1 to FIG. 5 show an integrated component unit which will be described later and which can be attached to and detached from the main body of an image forming apparatus (copier) according to an embodiment of the present invention.

The schematic structure of the image forming apparatus according to this embodiment will be described below with reference to FIG.

That is, in this image forming apparatus, a document table on which a document is placed, a document illumination lamp for displaying an image of the document on a mirror, a photosensitive drum carrying the image of the document, and an image of the document on the photosensitive drum. A mirror for connecting to form an electrostatic latent image, an imaging lens (zoom lens), a primary charger for uniformly charging the photosensitive drum before imaging, and before performing primary charging,
A pre-exposure lamp that erases the residual charge on the photosensitive drum, a blank exposure lamp that removes the surface charge of the photosensitive drum in the non-copy area, and prevents excess toner from adhering to the photosensitive drum, and the Pre-transfer charging that corrects the charge of the toner formed on the photosensitive drum by a developing device that attaches toner to the formed electrostatic latent image to form a toner image, and further eliminates the excess charge on the surface of the photosensitive drum. And a container.

Further, in this embodiment, as shown in FIG. 1, the carrying section 20 as a carrying means and the fixing section 30 as a fixing means.
The sheet discharging means and the sheet discharging / reversing section 40 serving as the reversing switching means are configured as an integrated component unit (hereinafter referred to as a fixing / conveying unit) 10 on the bottom plate 11 as one member.

In the fixing / conveying unit 10, front and rear side plates 12 and 13 are arranged on the bottom plate 11 in parallel with the conveying direction of the sheet material so that the parallelism is 0.2 or less.

The transport unit 20 includes a drive shaft 21 and a drive roller 2.
2, driven roller 23, transport belt 24, transport upper plate 25,
The transport duct 26 is included. The transport unit 20 is assembled (sub-assembly; see FIG. 2) before being incorporated in the fixing / transport unit 10, and when assembled in the fixing / transport unit 10, both ends of the drive shaft 21 are attached to the front and rear side plates 12, 13. To support.

Both ends of the fixing roller 31 constituting the fixing unit 30 are supported by the front and rear side plates 12 and 13 fastened to the bottom plate 11, and the pressure roller 32 is attached to the pressure arm 33 attached to the front and rear side plates 12 and 13. Both ends are supported. When the nip is adjusted by the fixing roller 31 and the pressure roller 32, a predetermined nip can be formed by tightening the screw 34 for the pressure arm.

A heater 35 is provided inside the fixing roller 31.
However, a cleaning web 36 is arranged on the upper part.

The paper discharge / reversal unit 40 has a separation claw 41 for separating the sheet material from the fixing roller 31 and the pressure roller 32.
And an internal paper ejection guide 42 for guiding the separated sheet material
And the inner paper discharge upper and lower rollers 43a, 43 provided at the ends of the inner paper discharge guide 42, and the inner paper discharge upper and lower rollers 43a, 4
3, the sheet discharge upper and lower guides 45 and 46 and the sheet discharge reversing guide 47 which guide through the sheet discharge flapper 48 as a reversing switching means for reversing the sheet material from the sheet 3 to the outside of the image forming apparatus main body 1. The upper and lower rollers 44a and 44 are provided for discharging the outer sheet, and both ends of each component are supported by the front and rear side plates 12 and 13 (see FIG. 5).

An end (right side) of the bottom plate 11 on the upstream side in the sheet conveying direction is bent in an L shape in the longitudinal direction and serves as a rail. A left rail 14 is provided at the downstream end (left side) in the sheet conveying direction and is fastened to the front and rear side plates 12 and 13 (see FIG. 3).

As shown in FIG. 3, the fixing / conveying unit 10 is locked by the simple locking means 50 so that it cannot be pulled out from the main body 1 of the normal image forming apparatus.

If a jam occurs in the fixing / conveying unit 10 or in another part of the main body in the continuous copy mode and the sheet material remains in the fixing / conveying unit 10, By opening the front cover (not shown) of the main body and grasping the grip 51 of the fixing / conveying unit 10, the latch 53 connected by the link 52 is released from being hooked to the positioning pin 5 in the main body 1. To be done,
The fixing / conveying unit 10 is ready to be pulled out.

Next, by pulling the handle 51 forward, the fixing / conveying unit 10 is pulled out along the main body rail 2, and the stopper 4 of the main body rail 2 and the unit rail 1 are pulled out.
4 and the stopper 16 fastened to the bottom plate 11 can be pulled out to a position where they collide with each other through the roller 3 on the main body 1 side and the roller 15 on the unit 10 side (see FIG. 4B).
Therefore, the sheet material accumulated in the transport unit 20, the fixing unit 30, and the paper discharge / reversal unit 40 can be easily found, the jam processing becomes easy, and the space for the jam processing work becomes unnecessary. The occupied area can be reduced.

Further, the replacement and assembly of the fixing roller 31 and the pressure roller 32, or the cleaning of the conveying section 20 can be carried out in the state shown in FIG. 4 (b) as described above. Therefore, these operations become easy.

After the predetermined work (jamming, maintenance, etc.) is completed, when the fixing / conveying unit 10 is mounted in the image forming apparatus main body 1, the fixing / conveying unit 10 is pushed while pushing the grip 51. Positioning pins 13a crimped on the rear side plate 13 are placed at predetermined positions (not shown) on the rear side plate 1b of the main body 1, and positioning pins 11a, 14a crimped on the bottom plate 11 and the left rail 14 are attached to the front side plate 1a of the main body 1. The latch 53 is fitted in a predetermined position (not shown).
Is hooked on the positioning pin 5 in the main body 1.

FIGS. 7 and 8 show the construction of the main part of an image forming apparatus (copier) according to the second embodiment of the present invention.

This is the bottom plate 1 shown in the first embodiment.
A sheet conveying member 20, a fixing unit 30, which are supported by a pair of front and rear side plates 12 and 13 on the downstream side of the sheet material in the conveying direction.
Aside from the paper discharge / reversal unit 40, a pair of front and rear side plates 62, which are parallel to the sheet material conveyance direction and are provided on the upstream side,
(63) is provided on the photosensitive drum 80 so as to be rotatable about the rotation shaft 61, and the front and rear side plates 62, (63) are provided.
Both ends of the charger rail 64 are fastened to each other, the toner image formed on the photosensitive drum 80 is transferred to a sheet material at a predetermined position in the charger rail 64, and the sheet material having the toner image is transferred to the photosensitive drum. A transfer / separation charger 60 as a transfer / separation means for separating from 80 is provided.

With this structure, when the bottom plate 11 having the fixing / conveying unit 10 is pulled out from the image forming apparatus main body 1 via the grip 51, the front and rear side plates 62, (6) are formed.
3) is rotated to separate it from the photosensitive drum 80 (see FIG. 8), and in that state, the bottom plate 11 is pulled out to transfer / transfer.
The separation charger 60 can be pulled out via the charger rail 64. As a result, jamming on the transfer / separation charger 60 is facilitated without soiling or scratching the surface of the photosensitive drum 80, and the toner adhering to the paper guide 65 can be easily cleaned. There is no need to worry about dirt on the back.

In the present embodiment, other structures and operations are the same as those in the first embodiment, and therefore, the same components are designated by the same reference numerals in the figure and their description is omitted.

FIG. 9 and FIG. 10 show the construction of the essential parts of an image forming apparatus (copier) according to the third embodiment of the present invention.

As shown in the second embodiment, this is the conveying section 20 and the fixing section 3 supported by the pair of front and rear side plates 12 and 13 arranged on the bottom plate 11 on the downstream side in the conveying direction of the sheet material.
0, a pair of front and rear side plates 6 provided on the upstream side, in parallel with the sheet material conveyance direction, separately from the paper discharge / reversing section 40.
2, (63) are provided on the photosensitive drum 80 so as to be rotatable about a rotation shaft 61, and front and rear side plates 62, (6
3) The both ends of the charger rail 64 are fastened to each other, and the transfer / separation charger 60 is arranged at a predetermined position in the charger rail 64.

In addition, the registration roller pair 70 is supported at both ends by the front and rear side plates 62, (63), and the pre-transfer upper and lower guides 71 and the pre-registration upper and lower guides 72 are also set at predetermined positions by the float pins 75. Each component forming these resist means for conveying the sheet material in time with the toner image on 80 is positioned.

With this structure, the second
10, the front and rear side plates 62, (63) are rotated and separated from the photosensitive drum 80 as shown in FIG. 10, the registration roller pair 70, the pre-transfer vertical guide 71, the pre-registration vertical The guide 72 is also pulled out, so that it is possible to collectively perform jam processing and maintenance in one process from before resist to before paper discharge.

Further, since one process from resist registration to paper discharge is placed on the bottom plate 11, the skew of the sheet material due to the deviation of the bus bars of the rollers, which occurs between the units, becomes slight, and the fixing unit 30 The frequency of paper wrinkles that have occurred is also reduced.

Since the other construction and operation of the present embodiment are the same as those of the first and second embodiments, the same components are designated by the same reference numerals in the drawings, and their explanations are omitted.

In the second and third embodiments, the transfer charger 60a and the separation charger 6 are mounted on the charger rail 64.
0b may be provided. Alternatively, only the transfer charger 60a may be used.

In each of the above embodiments, the image forming means provided with the reversal switching means to have the multiplex function or the double-sided function has been described as an example, but the invention is not limited to the one having the reversal switching means. Even if it has a single-sided function without the inversion switching means, it can be similarly applied.

[0058]

According to the present invention, the component unit including at least the conveying means, the fixing means, and the paper discharging means is integrated on one member in the main body of the image forming apparatus, so that it is simply pulled out of the main body of the image forming apparatus. Thus, the accumulated sheet material can be removed. As a result, it is possible to easily find the sheet material that has accumulated in the transport means, the fixing means, and the paper discharge means, and to eliminate the need for a space for removing the sheet material, and to reduce the actual occupied area.

Further, since the component unit can be pulled out of the main body of the image forming apparatus, it is easy to assemble, disassemble and clean the component unit including each means.

Further, on one member in the main body of the image forming apparatus,
Since the conveying means, the fixing means, and the paper discharging means are integrally provided, the positions between them can be accurately obtained. In particular, the roller pair in each means has a smaller deviation of the generatrix as compared with the conventional example, so that skew of the sheet material and paper wrinkles in the fixing means are reduced.

Further, when the component unit is attached to or detached from the main body of the image forming apparatus, at least the transfer means is moved in the direction away from the photosensitive drum, so that the surface of the photosensitive drum is not jammed or damaged. Processing can be performed.

Since the resist means, transfer / separation means, and reversal switching means are formed on one member in addition to the conveying means, the fixing means, and the paper discharging means, the sheet material is discharged / reversed from before the resist. Jam removal and maintenance within one process can be performed collectively by pulling out one unit from the main body.

Further, as described above, since one process from pre-registration to paper discharge / reversal is mounted on one member, the skew of the sheet material due to the deviation of the bus bars of each roller which has conventionally occurred between the units. Not only is it small, but it also has the effect of reducing the frequency of paper wrinkles occurring in the fixing means.

Further, as described above, since one process from the front of the resist mounted on one member to the discharging / reversing process is accurately positioned in the main body of the image forming apparatus, the photosensitive drum and each roller are The bus line deviation of can be corrected.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of essential parts of an image forming apparatus according to a first embodiment of the present invention.

FIG. 2 (a) is a top view of the sub-assembled transport unit of FIG. 1, and FIG. 2 (b) is a front view thereof.

FIG. 3 is a top view showing a simple locking means.

FIG. 4 is a top view of only the frame structure. FIG. 4 (a) shows the fixing / conveying unit mounted, and FIG. 4 (b) shows the fixing / conveying unit pulled out. Is shown.

FIG. 5 is a top view (roller structure) of the main part of FIG.

FIG. 6 is an overall sectional configuration diagram of an image forming apparatus according to a first embodiment of the present invention.

FIG. 7 is a cross-sectional configuration diagram of essential parts of an image forming apparatus according to a second embodiment of the present invention.

8 is a cross-sectional view of essential parts showing a state in which the transfer / separation unit is separated from the photosensitive drum in the image forming apparatus of FIG.

FIG. 9 is a cross-sectional configuration diagram of essential parts of an image forming apparatus according to a third embodiment of the present invention.

10 is a cross-sectional view of essential parts showing a state in which a pair of registration rollers and a transfer / separation unit are separated from a photosensitive drum in the image forming apparatus of FIG.

FIG. 11 is a schematic cross-sectional configuration diagram of a conventional image forming apparatus.

FIG. 12 is a cross-sectional view of essential parts of a conventional image forming apparatus.

13 is a cross-sectional view of essential parts showing a state in which a pair of registration rollers and a transfer / separation unit are separated from a photosensitive drum in the image forming apparatus of FIG.

[Explanation of symbols]

 1 Image Forming Apparatus Main Body 1a Front Side Plate 1b Rear Side Plate 2 Main Body Rail 3 Roller (Main Body) 4 Stopper (Main Body) 5 Positioning Pin (Main Body) 10 Fixing / Conveying Unit (Parts Unit) 11 Bottom Plate (One Member) 12 Front Side Plate 13 Rear Side plate 14 Left rail 11a, 13a, 14a Positioning pin 15 Roller (unit) 16 Stopper (unit) 20 Conveying part (conveying means) 21 Drive shaft 22 Drive roller 23 Driven roller 24 Conveying belt 25 Conveying upper plate 26 Conveying duct 30 Fixing part (Fixing means) 31 Fixing roller 32 Pressure roller 33 Pressure arm 34 Pressure arm screw 35 Heater 36 Cleaning web 40 Paper discharging / reversing section (paper discharging / reversing switching means) 41 Separation claw 42 Inside paper discharging guide 43 Inside Lower ejection roller 43a Inner ejection upper roller 44 Outer ejection lower roller 44a Outer ejection Upper roller 45 Paper ejection upper guide 46 Paper ejection lower guide 47 Paper ejection reversing guide 48 Paper ejection flapper (reversal switching means) 50 Locking means 51 Handle 52 Link 53 Latch 60 Transfer / separation charger (transfer / separation means) 60a Transfer charger 60b Separation Charger 61 Rotating Shaft 62 Front Side Plate (63) Rear Side Plate 64 Charger Rail 65 Paper Guide 70 Registration Roller Pair 71 Pre-Transfer Vertical Guide 72 Pre-Registration Vertical Guide 75 Float Pin 80 Photosensitive Drum

Claims (11)

[Claims] 1. A resist means for conveying a sheet material in time with a toner image on a photosensitive drum, a transfer means for transferring the toner image on the photosensitive drum to the sheet material, and a toner image transfer. Conveying means for conveying the finished sheet material to the fixing means, fixing means for fixing the image of the sheet material after image formation on the sheet surface, and the sheet material fixed by the fixing means to the image forming apparatus. An image forming apparatus comprising: a sheet discharging unit for discharging the sheet out of the main body; and a reversing switching unit for reversing the sheet material fixed by the fixing unit. And a conveying unit, a fixing unit, a sheet discharging unit, and a reversal switching unit are formed on one member in the image forming apparatus main body, and the parts unit is arranged from the front side of the image forming apparatus main body. Body Image forming apparatus characterized by enabling detachable to. 2. A resist means for conveying a sheet material in time with a toner image on a photosensitive drum, a transfer means for transferring the toner image on the photosensitive drum to the sheet material, and a transfer of the toner image. Conveying means for conveying the finished sheet material to the fixing means, fixing means for fixing the image of the sheet material after image formation on the sheet surface, and the sheet material fixed by the fixing means to the image forming apparatus. In an image forming apparatus having a sheet discharging unit for discharging the sheet to the outside of the main body, parts including the registration unit, the transfer unit, the conveying unit, the fixing unit, and the sheet discharging unit are provided in the main body of the image forming apparatus. An image forming apparatus, wherein the component unit is configured to be detachable from the front side of the image forming apparatus main body to the outside of the image forming apparatus main body. 3. A conveying means for conveying a sheet material after transfer of a toner image to a fixing means, a fixing means for fixing an image of the sheet material after image formation on a sheet surface, and the fixing means. In an image forming apparatus having a sheet discharging unit for discharging the sheet material subjected to the fixing process to the outside of the main body of the image forming apparatus, an image of a part including the conveying unit, the fixing unit, and the sheet discharging unit is imaged. An image forming apparatus, comprising one member in the main body of the image forming apparatus, wherein the component unit is attachable to and detachable from the main body of the image forming apparatus from the front side of the main body of the image forming apparatus. 4. The pair of side plates are supported on the one member in parallel with the sheet material conveying direction, and the rollers of the respective means are supported by the pair of side plates. The image forming apparatus according to item 3. 5. The image forming apparatus according to claim 1, wherein two pairs of side plates are respectively supported on the one member in parallel with a sheet material conveyance direction, and a pair of sheet materials is provided on an upstream side in the sheet material conveyance direction. An image forming apparatus characterized in that a resist means and a transfer means are provided between the side plates, and a carrying means, a fixing means, a paper discharging means, and a reversal switching means are provided between a pair of side plates on the downstream side in the sheet material carrying direction. 6. The image forming apparatus according to claim 2, wherein two pairs of side plates are respectively supported on the one member in parallel with the sheet material conveying direction, and a pair of sheet materials is provided on the upstream side in the sheet material conveying direction. An image forming apparatus characterized in that a registration means and a transfer means are provided between the side plates, and a conveyance means, a fixing means, and a paper discharge means are provided between a pair of side plates on the downstream side in the sheet material conveyance direction. 7. The image forming apparatus according to claim 1, 2, 5 or 6, further comprising a separating means for separating the sheet material from the photosensitive drum, and forming an image of a component unit including the separating means. An image forming apparatus, wherein the registration means, the transfer means, and the separation means move in a direction of separating from the photosensitive drum when the apparatus is attached to or detached from the inside of the apparatus main body. 8. The image forming apparatus according to claim 3, further comprising transfer means for transferring the toner image on the photosensitive drum, and separating means for separating the sheet material from the photosensitive drum, An image forming apparatus, wherein the transfer unit and the separating unit move in a direction away from a photosensitive drum when a component unit including the transfer unit and the separating unit is attached to and detached from the main body of the image forming apparatus. 9. The image forming apparatus according to claim 3, further comprising transfer means for transferring the toner image on the photosensitive drum, wherein the component unit including the transfer means is provided outside the main body of the image forming apparatus. An image forming apparatus, wherein the transfer means moves in a direction of separating from the photosensitive drum when being attached to or detached from. 10. The image forming apparatus according to claim 1, wherein the registration means includes at least a registration roller pair and a pre-transfer vertical guide. apparatus. 11. The image forming apparatus according to claim 4, 5, 6 or 7, wherein an upstream end of the sheet material on the one member in the conveying direction is bent in parallel with the longitudinal direction of the roller. apparatus.