JPH082753A - Image forming device - Google Patents

Abstract

PURPOSE:To facilitate maintenance of a paper feeder in a hand insertion paper feed part by easily performing jam processing in the downstream of the hand insertion paper feed part, so as to eliminate position displacing a sheet material in the halfway of conveying it stopped in a vertical path when performed this jam processing. CONSTITUTION:The first opening/closing door 30 for processing a jam generated in a vertical path 24 and the second opening/closing door 31 for processing a jam generated in a paired register rollers 12 in the downstream of a hand insertion paper feed part 21 are mounted respectively on one side of an image forming device main unit 5. An inverting member 16, conveying rollers 11B, 15B, guide member 24B, etc., are set up in the first opening/closing door 30, and a paper feeder 21B, hand insertion tray 21A, etc., are set up in the second opening/closing door 31.

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]

2. Description of the Related Art FIG. 5 shows the overall configuration of an image forming apparatus of Conventional Example 1.

The image forming apparatus is an electrophotographic copying machine, in which an image of a document (not shown) placed on a document table 1 is read by an optical system 2 which scans in the direction of an arrow and rotated clockwise. The image is projected on the photosensitive drum 3 which is running. Then, the electrostatic latent image formed on the photosensitive drum 3 by this is visualized by the developing device 4 and becomes a toner image.

In this image forming apparatus, a plurality of sheet feeding cassettes (front loading cassettes) for stacking and storing sheet materials of different sizes in the main body 5 of the image forming apparatus.
6 and 7, the sheet material of an appropriate size among these cassettes is selectively fed to the transfer portion (between the photosensitive drum 3 and the transfer charger 8).

Sheet materials (not shown) stacked and housed in the paper feed cassette 6 are sequentially fed out by the paper feed roller 9 from the uppermost sheet material. Then, the sheet material fed by the paper feed roller 9 is separated one by one by the separation roller pair 10 and sent to the registration roller pair 12 whose rotation is stopped by the conveyance roller pair 11.

Sheet materials (not shown) stacked and housed in the paper feeding cassette 7 are sequentially fed out by the paper feeding roller 13 from the uppermost sheet material. And the paper feed roller 1
The sheet material fed by 3 is separated one by one by the separation roller pair 14, and is sent to the registration roller pair 12 whose rotation is stopped by the conveyance roller pairs 15 and 11.

The sheet material directed to the pair of registration rollers 12 is reversed by the reversing member 16.

When the leading edge of the sheet material fed from the sheet feeding cassette 6 or 7 hits the nip of the registration roller pair 12 whose rotation is stopped, a predetermined loop is formed to correct the skewed state.

After that, the sheet material is sent to the transfer portion by the registration roller pair 12 which starts rotation at a timing for aligning the position with the toner image on the photosensitive drum 3 which is rotating clockwise, and is transferred to the photosensitive drum 3. The upper toner image is transferred onto the sheet surface by the transfer charger 8.

The sheet material on which the toner image has been transferred is sent to the fixing device 18 by the conveyor belt 17, and the identification fixing device 1
The toner image is fixed on the sheet surface by 8.

The sheet material after the fixing process of the toner image is discharged onto a discharge tray 20 outside the apparatus by a discharge roller pair 19.

In the present image forming apparatus, in addition to the above-described cassette paper feeding, manual paper feeding section 21 can also perform manual paper feeding.

When manually feeding sheet materials one by one,
The sheet material is placed on the manual feed tray 21A and the leading end is inserted into the paper feed port 22. By doing so, the sheet material is fed by the sheet feeding device 21B installed in the image forming apparatus main body 5 to the registration roller pair 12 whose rotation is stopped. The leading edge of the fed sheet material is the registration roller pair 12
When it hits the nip, a predetermined loop is formed to correct the skewed state.

Thereafter, the sheet material is transferred and fixed on the toner image in the same manner as in the case of the above-described cassette paper feeding, and then discharged to the outside of the machine.

In the present image forming apparatus, a jam generated in the vertical path (vertical conveying section) 24 in which the conveying roller pairs 11 and 15 are installed and a jam generated in the registration roller pair 12 are processed. An opening / closing door 25 is provided below the manual feed tray 21A.

The opening / closing door 25 is attached to the image forming apparatus main body 5 so as to rotate in the vertical direction (arrow direction) about the lower end 25A side. And this door 2
5 includes one roller (following roller) 11B and 15B of the pair of transport rollers 11 and 15, one guide member (transport guide) 24B forming the vertical path 24, and the reversing member 1.
6th class is installed. In addition, the pair of transport rollers 11 and 15
The other rollers (driving rollers) 11A and 15A and the other guide member 24A forming the vertical path 24 are installed on the image forming apparatus main body 5 side.

When processing a jam generated in the vertical path 24 and a jam generated in the registration roller pair 12, the opening / closing door 25 is opened as shown in FIG. The sheet material (not shown) having a jam in the vertical path 24 can be removed by pulling it out because the vertical path 24 is opened when the opening / closing door 25 is opened. The sheet material S1 jammed by the registration roller pair 12 can be removed by pushing down the lever 26, which widens the gap between both rollers of the registration roller pair 12, in the direction of arrow A and pulling it out in the direction of arrow B as shown in FIG.

FIG. 7 shows the overall structure of an image forming apparatus (electrophotographic copying machine) of the second conventional example.

In this image forming apparatus, an opening / closing door 27 which can open the side surface of the image forming apparatus main body 5 substantially entirely.
It has.

The opening / closing door 27 is attached to the image forming apparatus main body 5 so as to rotate in the front-rear direction (arrow direction) about the side 27A. And this door 2
7 includes a manual feed tray 21A, a paper feeding device 21B, a reversing member 16, one roller (not shown) of the conveying roller pairs 11 and 15, one guide member (not shown) forming a vertical path 24, and the like. is set up.

When processing a jam generated in the vertical path 24 and a jam generated in the registration roller pair 12, the opening / closing door 27 is opened as illustrated. The sheet material S2 jammed in the vertical path 24 can be removed by pulling it out because the vertical path 24 is opened when the opening / closing door 27 is opened. Sheet material S1 jammed by the pair of registration rollers 12
Can be removed in the same manner as in FIG.

[0022]

However, the above-mentioned conventional example 1
In this image forming apparatus, since the opening / closing door 25 is designed to open the lower part of the manual feeding tray 21, the opening downstream of the manual feeding unit is insufficient. Therefore, as shown in FIG. It was difficult to remove the sheet material S1 jammed by the registration roller pair 12.

Further, in the image forming apparatus of the second conventional example, when the opening / closing door 27 is opened, the vertical path 24 is completely opened. Therefore, as shown in FIG. When the opening / closing door 27 is opened to remove the raised sheet material S1, and the sheet material S2 being conveyed is stopped in the vertical path 24, the sheet material S2 falls down toward the outside of the machine and is displaced. Will end up. Therefore, the sheet material S2 cannot be conveyed after the jam processing, and must be removed from the vertical path 24. Since the sheet feeding device 21B and the reversing member 16 are mounted close to each other on the opening / closing door 27, maintenance of the sheet feeding device 21B (for example, replacement of the sheet feeding roller) is difficult to perform.
Therefore, one of the sheet feeding device 21B and the reversing member 16 must be removed from the opening / closing door 27. The opening / closing door 27 is large in size so as to open substantially the entire one side surface of the image forming apparatus main body 5, and is attached with the paper feeding device 21B, the manual feed tray 21A, the reversing member 16 and the like, and thus is very heavy. For this reason, the opening / closing door 2 is used for maintenance, etc.
A great deal of labor is required for the work of detaching 7 from the image forming apparatus main body 5 and attaching it to the image forming apparatus main body 5. Further, when the opening / closing door 27 is opened, the weight of the opening / closing door 27 may cause the image forming apparatus main body 5 to tilt, which makes the installation state unstable.

There was a problem.

Therefore, the present invention has been made in view of the above circumstances, and it is easy to perform jam processing, and it is easy to perform maintenance without wasting a sheet material that has not caused a jam during the jam processing. An object is to provide an image forming apparatus.

[0026]

According to the present invention, the sheet material fed from the paper feed section (6, 7) in the image forming apparatus main body (5) is inverted and conveyed to the image forming section (3). A vertical conveyance section (24) and a manual sheet feeding section (2) for feeding a sheet material from outside the image forming apparatus main body (5) to the image forming section (3).
1) and 1) are arranged on one side of the image forming apparatus main body (5).

In order to achieve the above object, the present invention provides a rotary type first opening / closing door (30) for treating a jam generated in the vertical transport section (24), and the manual paper feed. A rotary type second opening / closing door (31) for treating a jam generated downstream of the section (21) is provided on one side of the image forming apparatus main body (5). .

The reversing member (16), the conveying rollers (11B, 15B), the conveying guide (24B), etc., which constitute the vertical conveying section (24), are installed on the first opening / closing door (30). The second opening / closing door (31) has a paper feeding device (21B) that constitutes the manual paper feeding unit (21),
A manual feed tray (21A) and the like are installed.

[0029]

According to the image forming apparatus of the present invention having the above structure, when the first opening / closing door (30) is opened, the vertical conveying section (24) is opened.
Can be sufficiently opened, and when the second opening / closing door (31) is opened, the downstream portion of the manual paper feeding unit (21) can be sufficiently opened.

As a result, the sheet material (S) jammed in the downstream portion of the vertical transport portion (24) and the manual paper feeding portion (21) is generated.
2, S1) can be easily removed.

When the jammed sheet material (S1) is removed at the downstream side of the manual paper feed section (21), the second opening / closing door (31) is opened and the first opening / closing door (30) is closed. Keep it.

Therefore, when the sheet material (S2) being conveyed to the vertical conveyance unit (24) is stopped, the vertical conveyance unit (24)
Since the sheet material is not released, the sheet material (S2) stopped in the middle of the conveyance does not shift its position.

As a result, the sheet material (S2) stopped during transportation can be continuously transported after the jam processing, and is not wasted.

Further, the reversing member (16) is attached to the first opening / closing door (30), and the manual paper feeding section (21) is provided.
Since the sheet feeding device (21B) is attached to the second opening / closing door (31), when the first opening / closing door (30) and the second opening / closing door (31) are closed, the sheet feeding device The reversing member (16) close to (21B) is the second opening / closing door (31).
When opened, it is far away from the paper feeding device (21B).

Thus, when performing maintenance on the sheet feeding device (21B), the sheet feeding device (21B) and the reversing member (1)
There is no need to remove 6) from the door, and maintenance can be done easily.

An opening / closing door for processing a jam generated in the vertical conveyance section (24) and a jam generated in the downstream section of the manual paper feed section (21) is formed in the vertical conveyance section (24). The first opening / closing door (30) for processing the jam and the second opening / closing door (31) for processing the jam generated in the downstream portion of the manual paper feeding unit (21) are separately formed. It is provided on one side of the device body (5).

As a result, the first opening / closing door (30) and the second
The opening / closing door (31) does not have to be too heavy, and the first opening / closing door (30) and the second opening / closing door (31) can be removed from the image forming apparatus main body (5) at the time of maintenance or the like. The work of attaching to the forming apparatus main body (5) can be performed easily. Further, even if the first opening / closing door (30) or the second opening / closing door (31) is opened, the image forming apparatus main body (5) does not tilt.

The reference numerals in parentheses refer to the drawings and do not limit the structure of the present invention.

[0039]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> FIG. 1 shows the overall configuration of an image forming apparatus (electrophotographic copying machine) according to Embodiment 1 of the present invention.

In describing the present image forming apparatus, the same members and the like as those of the image forming apparatus of Conventional Example 1 (FIG. 5) will be designated by the same reference numerals, and those that are structurally and functionally unchanged will be described. , The description is omitted.

In the present image forming apparatus, the first opening / closing door 30 for processing the jam generated in the vertical path 24.
And a second opening / closing door 31 for processing a jam generated in the registration roller pair 12 downstream of the manual paper feeding unit 21.

The first opening / closing door 30 is, as shown in FIG.
It is attached to the image forming apparatus main body 5 so as to rotate in the front-rear direction (arrow direction) about the one side end 30A. The first opening / closing door 30 includes the reversing member 16
And one roller 11B, 1 of the conveying roller pair 11,15
5B (not shown in FIG. 2) and one guide member 24B (not shown in FIG. 2) forming the vertical path 24 are installed.

The second opening / closing door 31 is, as shown in FIG.
It is attached to the image forming apparatus main body 5 so as to rotate in the front-back direction (arrow direction) about the one side end 31A. A manual feed tray 21A, a sheet feeding device 21B, and the like are installed on the second opening / closing door 31.

The first opening / closing door 30 and the second opening / closing door 31 are
Usually, it is locked by a door locking means (not shown) driven by an electromagnetic solenoid or the like.

In the image forming apparatus, when a jam occurs in the vertical path 24, the jam detecting sensor (first jam detecting means) 32 including the reflection type optical sensor detects the jam. Further, when a jam occurs in the registration roller pair 12, a jam detecting sensor (second jam detecting means) 33 including a reflection type optical sensor detects the jam.

When the jam detection sensor 32 or 33 detects a jam, a CPU (control means) 34 for controlling the operation of the entire image forming apparatus is displayed on a display panel (display means) 35 such as an operation unit (not shown). On the other hand, a message indicating that a jam has occurred and the door number to be opened are displayed, and at the same time, the door locking means of the first opening / closing door 30 or the second opening / closing door 31 is released.

That is, when the jam detection signal is input from the jam detection sensor 32, the CPU 34 opens the door 1
At the same time that (the first opening / closing door 30) is displayed, the locking means (first door locking means) 36 of the door 1 is turned off. When a jam detection signal is input from the jam detection sensor 33, the door 2 (second opening / closing door 31) is displayed and, at the same time, the locking means (second door locking means) 37 of the door 2 is turned off. Further, when jam detection signals are input from both the jam detection sensors 32 and 33, the doors 1 and 2 are displayed and at the same time, the locking means 36 and 37 of the doors 1 and 2 are turned off.

Therefore, when a message indicating that a jam has occurred is displayed on the display panel 35, the operator opens the door having the door number displayed on the display panel 35 to perform the jam processing.

That is, when the door 1 is displayed, the first opening / closing door 30 is opened as shown in FIG.
If the sheet material S2 causing the jam inside is removed and the door 2 is displayed, the sheet material causing the jam by the registration roller pair 12 by opening the second opening / closing door 31 as shown in FIG. When S1 is removed and the doors 1 and 2 are displayed, the first opening / closing door 30 and the second opening / closing door 31 are opened to cause a jam across the vertical path 24 and the registration roller pair 12. Remove the material.

If a door number is displayed on the display panel 35 when a jam occurs, as in the present image forming apparatus, the operator can open only the door required for jam processing. Further, when a jam occurs, if the locking means of the door necessary for the jam clearance is released, the operator does not open the unnecessary door for the jam clearance.
For this reason, for example, the first opening / closing door 30 is not opened when the jam caused by the pair of registration rollers 12 is processed, so that the position of the sheet material S2 which is stopped in the vertical path 24 and which is in the middle of conveyance. Displacement can be reliably prevented. <Embodiment 2> FIG. 4 shows another mounting example of the first opening / closing door 30 and the second opening / closing door 31.

In this embodiment, the first opening / closing door 30
Is attached to the image forming apparatus main body 5 so as to rotate in the vertical direction (arrow direction) about the lower end 30B. Further, the second opening / closing door 31 is attached to the image forming apparatus main body 5 so as to rotate in the vertical direction (arrow direction) about the upper end 31B.

When the first opening / closing door 30 is opened to the position shown by the imaginary line, the downward rotation of the door 30 is restricted by stopper means (not shown). Further, when the second opening / closing door 31 is opened to the position shown by the imaginary line, the door 31 is held by holding means (not shown).

In the first embodiment, the first opening / closing door 30 and the second opening / closing door 31 are attached to the image forming apparatus main body 5 so as to rotate in the forward and backward directions, respectively. , First opening / closing door 30 and second opening / closing door 31
The first opening / closing door 30 and the second opening / closing door 31 do not need to rotate in the same direction. The door 30 may be attached to the image forming apparatus main body 5 so as to rotate in the vertical direction, and the second opening / closing door 31 may be attached to the image forming apparatus main body 5 so as to rotate in the front and rear directions.

[0054]

As described above, in the image forming apparatus of the present invention, the first opening / closing door is opened to perform the jam processing of the vertical conveyance section, and the second opening / closing door is opened to open the manual feeding section. Since the jam processing of the downstream portion is performed, there are advantages that the jam processing performance is improved, the waste of the sheet material is eliminated, and the door can be easily attached and detached.

Further, since the reversing member of the vertical conveying section is attached to the first opening / closing door and the sheet feeding device of the manual sheet feeding section is attached to the second opening / closing door, the maintenance of the sheet feeding apparatus can be easily performed. There is.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing the overall configuration of an image forming apparatus (copying machine) according to a first embodiment of the present invention.

FIG. 2 is an external perspective view showing a state in which a first opening / closing door of the image forming apparatus is opened.

FIG. 3 is an external perspective view showing a state in which a second opening / closing door of the image forming apparatus is opened.

FIG. 4 is a vertical cross-sectional side view showing another mounting example (Example 2) of the first opening / closing door and the second opening / closing door in the image forming apparatus.

FIG. 5 is a vertical cross-sectional side view showing the overall configuration of an image forming apparatus (copying machine) of Conventional Example 1.

FIG. 6 is an enlarged perspective view of an essential part showing a state in which an opening / closing door of the image forming apparatus is opened to perform jam processing.

FIG. 7 is an external perspective view showing a state in which an opening / closing door of the image forming apparatus (copying machine) of Conventional Example 2 is opened.

[Explanation of symbols]

 3 Photosensitive drum (image forming unit) 5 Image forming apparatus main body 6, 7 Paper feeding cassette (paper feeding unit) 11B, 15B Conveying roller 16 Reversing member 21 Manual feeding unit 21A Manual feeding tray 21B Paper feeding device 24 Vertical path (vertical conveyance) 24B guide member (conveyance guide) 30 first opening / closing door 31 second opening / closing door 32 jam detection sensor (first jam detection means) 33 jam detection sensor (second jam detection means) 34 CPU (control means) ) 35 display panel (display means) 36 lock means for door 1 (first door lock means) 37 second lock means (second door lock means) S1, S2 sheet material

Claims (4)

[Claims] 1. A vertical conveyance unit for reversing and conveying a sheet material fed from a paper supply unit in the main body of the image forming apparatus to the image forming unit, and a sheet material from outside the main body of the image forming apparatus to the image forming unit. An image forming apparatus in which a manual sheet feeding section for feeding a sheet is disposed on one side of the image forming apparatus body. An image forming device, characterized in that a door and a pivotable second opening / closing door for processing a jam generated downstream of the manual paper feeding unit are provided on one side of the image forming apparatus main body. apparatus. 2. The first opening / closing door is provided with a reversing member, a carrying roller, a carrying guide, and the like which constitute the vertical carrying unit, and the second opening / closing door is provided with the manual paper feeding unit. The image forming apparatus according to claim 1, further comprising a sheet feeding device, a manual feed tray, and the like that configure the above. 3. A first jam detecting unit that detects a jam that has occurred in the vertical conveyance unit, a second jam detecting unit that detects a jam that has occurred downstream of the manual paper feeding unit, and a jam has occurred. When a jam detection signal is input from the display unit that displays a message to that effect and the door number and the jam detection signal is input from the first jam detection unit, the message indicating that a jam has occurred and the number of the first opening / closing door are displayed on the display unit. When a jam is detected and a jam detection signal is input from the second jam detecting means, a message indicating that a jam has occurred and the number of the second opening / closing door are displayed on the display means, and the first jam detecting means and When a jam detection signal is input from the second jam detection means,
The image forming apparatus according to claim 1, further comprising: a message indicating that a jam has occurred on the display unit, and a control unit that displays each number of the first opening / closing door and the second opening / closing door. apparatus. 4. A first jam detecting means for detecting a jam generated in the vertical transport section, a second jam detecting means for detecting a jam generated in the downstream of the manual sheet feeding section, and the first jam detecting section. When a first door locking means for releasably locking the opening / closing door, a second door locking means for releasably locking the second opening / closing door, and a jam detection signal from the first jam detecting means are input. When the jam detection signal is input from the second jam detecting means after releasing the first door locking means, the second door locking means is released and the first door locking means is released.
And a control means for releasing the first door locking means and the second door locking means when a jam detection signal is inputted from the jam detecting means and the second jam detecting means. The image forming apparatus according to claim 1.