JPH09258496A - Image forming device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent jamming and document damage by automatically canceling the folded state of the folded originals even when the folded originals are mixed in the stacked originals, thereby forming an image. Improve the efficiency of. SOLUTION: In an automatic document feeder 4 having an original placing table 38 for setting a plurality of originals in a state in which folded originals are mixed, an original feeding roller 7 for feeding the originals one by one, and then a document is conveyed. A fold correction member 37 which has a document conveyance roller 5 and a document separation roller 6 and is tilted by a fold correction solenoid 36 in front of the document introduction roller 7 to lightly contact the document.
The first folding state (34) is automatically released by the tip of the folding correction member 37 being first caught on the second folding section 35 of the folded original 90, and the first folding state (34) is also caught during the subsequent conveyance. The folded state (35) of 2 is automatically released.

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 or a scanner having an automatic document feeder,
More specifically, the present invention relates to processing an original in a case where a plurality of originals are mixed with a folded original 90 in which the original is once folded and then folded back as shown in FIG.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Laid-Open No. 4-86754
The publication discloses a copying machine for performing a copying operation by feeding out a long folding original 100 folded in a continuous Z-shape as shown in FIG. 35 while sequentially releasing the folded state. There is.

[0003]

The copying machine disclosed in the above publication is
The present invention does not process the folded original 90 of FIG. 34.

In a conventional copying machine other than the copying machine of the above publication, which is equipped with an automatic document feeder, even in the case of a plurality of originals in which folding originals are mixed,
Documents are fed / conveyed on the assumption that no folded documents are mixed.
There is a problem that an image is not accurately formed because the paper is easily jammed or damaged during transportation. Further, when copying a folded original, the operator must correct the folded portion before setting the original, which causes a problem that copy efficiency deteriorates.

According to the present invention, even when folded originals are mixed in the stacked originals, jamming and original damage are prevented by automatically canceling the folded state of the folded originals, and the efficiency of image formation is improved. The purpose is to improve the sex.

[0006]

An image forming apparatus according to a first aspect of the present invention is an automatic document feeder having an original placing table on which a plurality of originals are set, and one original on the original placing table. It is characterized in that it is provided with a means for feeding the sheets one by one, and a fold correction member which comes into contact with the fed document and automatically releases the folded state by hooking the folded part when the fed document is a folded document. There is. The folding correction member comes into contact with a folded original to be fed, and the folded portion is hooked to automatically release the folded state. Therefore, even if the original set on the original placing table is a plurality of originals mixed with folded originals. , It is possible to correct the posture of the folded document and convey it to the platen without jamming or damage to the document to form an image, and convey all the documents continuously without the operator's hand. Therefore, the efficiency of image formation can be improved.

The image forming apparatus according to claim 2 of the present invention is
An automatic document feeder having an original placing table for setting a plurality of originals is provided with means for feeding the originals on the original placing table one by one, and the rear end of the originals on the original placing table is lightened. It is characterized in that a pressure contact member is provided to prevent the rear end portion from moving when the front end portion of the original is fed by pressing. If the fed document is a folded document, the pressure contact member is in light contact with the folded portion (rear end), and even if the front end of the folded document is fed, the rear end is in light contact. It does not move and the frictional force between the rear end, which is the folded part, and the pressure contact member is stronger than the frictional force at the folded intermediate part, so the folded intermediate part is pulled out and the folded state is automatically released. To be done. In this way, even if the original set on the original placing table is a plurality of originals mixed with folded originals, the originals of the folded originals are corrected and the originals are conveyed to the original tray without causing a jam or damage to the originals. An image can be formed by using this method, and since all the originals can be continuously conveyed without the operator having to move their hands, the efficiency of image formation can be improved.

An image forming apparatus according to a third aspect of the present invention is
An automatic document feeder having an original placing table for setting a plurality of originals is provided with means for feeding the originals on the original placing table one by one, and the rear end of the originals on the original placing table is lightened. It is characterized in that a reverse rotation roller is provided which rotates in the direction opposite to the paper feeding direction when the front end of the original is fed by pressing. If the fed document is a folded document, even if the front end of the folded document is fed, the rear end of the folded part will be sent in the reverse direction by the reverse roller.
Since the frictional force between the rear end portion which is the folded portion and the reverse rotation roller is stronger than the frictional force at the folded intermediate portion, the folded intermediate portion is pulled out and the folded state is automatically released. In this way, even if the original set on the original placing table is a plurality of originals mixed with folded originals, the originals of the folded originals are corrected and the originals are conveyed to the original tray without causing a jam or damage to the originals. An image can be formed by using this method, and since all the originals can be continuously conveyed without the operator having to move their hands, the efficiency of image formation can be improved.

An image forming apparatus according to a fourth aspect of the present invention is
An automatic document feeder having an original placing table for setting a plurality of originals downward is provided with means for feeding the originals on the original placing table one by one in a trade-in manner, and the latter half of the original placing table is provided in the first half. It is characterized in that a step is provided so that the second folded portion of the folded original is brought into contact with the portion so as to be slightly higher than the portion. When the front end of the folded original is conveyed, the second folded portion of the folded original catches on the step of the original placing table at the rear end, and the first folded state is automatically released. Holds the state in which the second folded portion of the folded original is hooked, the second folded state is also automatically released. In this way, even if the document is fed in the downward direction or in the trade-in state, the folded state can be automatically released, and the image can be formed by being conveyed to the document table without causing a jam or the document being damaged. Since all originals can be continuously conveyed without the need to move their hands, the efficiency of image formation can be improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an image forming apparatus according to the present invention will be described below with reference to the drawings. In the present embodiment, a copying machine will be described as an example of the image forming apparatus.

FIG. 2 shows a general folding original 90. Here, the names of the respective parts of the folded original 90 are unified. Generally, a general folding original 90 is folded twice in the longitudinal direction of the original, as shown in FIG. 2, and is folded into A4 size for A3 original and B5 size for B4 original. . In the present invention, 32 in FIG.
2 is called the leading end of the folded document, 33 is the trailing end of the folded document, 34 is the first folding part, and 35 is the second folding part. I will decide.

[First Embodiment] FIG. 1 shows a sectional structure of a copying machine according to an embodiment of the present invention. An automatic document feeder 4 is placed on a document table 12 made of transparent hard glass so as to be openable and closable. A plurality of originals are set on the original placing table (tray) 38 of the automatic original feeder 4, and after the originals are detected by the original detection sensor 8 including an actuator, the operator places a print switch on the operation panel. By pressing, the copying machine body starts the copying operation.

When the copying operation is started, the original set on the original placing table 38 of the automatic original feeding device 4 has the original feeding roller 7, the original conveying roller 5, the original separating roller 6, the original registration roller 3, and the original conveying belt. 11
Therefore, only one sheet is conveyed. The trailing edge of the transported document is detected by the document trailing edge detection sensor 61, and the document transport belt 11 is stopped after the lapse of the transport time from the timing to the document scanning start position to start scanning the document on the document table 12. The document is conveyed until the trailing edge of the original comes to the position and stops.

When the document is stopped, the irradiation lamp 10 arranged inside the irradiation lamp unit is turned on and the document is irradiated. The reflected light is the first mirror 9 in the irradiation lamp unit, the second mirror 1, the third mirror 2, the lens 13, the fourth mirror 18, the fifth mirror 19 and the sixth mirror in the optical unit.
The photoconductor 27 rotatably attached is irradiated via the mirror 15. When the irradiation lamp unit moves in the scanning direction and the photoconductor 27 rotates clockwise, the photoconductor 27 is irradiated with light corresponding to the original image.

When this document scanning is completed, the document on the platen 12 is conveyed by the document conveying belt 11, the document reversing roller 17,
The document is discharged by the document discharge roller 16.

In the case of the OC copying operation which does not use the automatic document feeder 4, the operator sets one document at the document scanning start position on the document table 12 and the print switch arranged on the operation panel. By pressing, the copying machine body starts the copying operation. When the copying operation is started, the irradiation lamp 10 is turned on to irradiate the document, and the reflected light is reflected by the first mirror 9, the second mirror 1, the third mirror 2, the lens 13, and the fourth mirror 18 as described above. , Through the fifth mirror 19 and the sixth mirror 15, the photoconductor 27 rotatably attached is irradiated. When the irradiation lamp unit moves in the scanning direction and the photoconductor 27 rotates clockwise, the photoconductor 27 is irradiated with light corresponding to the original image.

During the scanning of the original, only one copy sheet is fed / conveyed by the sheet pickup roller 20, the sheet conveying roller 21 and the sheet separating plate 22. After the copy paper passes through the pre-registration sensor 23, the paper conveyance is stopped when a predetermined time has passed, and the registration roller 25 corrects the oblique feeding of the copy paper. After that, manuscript table 1
In synchronism with the scanning timing of the original document on 2, the registration roller 25 is rotated to convey the paper.

On the other hand, on the photoconductor 27, the photoconductor 27 is uniformly charged by the corona discharge of the charging device 14, and thereafter,
An electrostatic latent image is formed on the photoconductor 27 by irradiating the reflected light of the document. This electrostatic latent image is visualized by the developing tank 24, and the image is transferred to the copy sheet by the transfer device 26. The developer remaining on the photoconductor 27 is cleaned by the cleaner 29, and the charge on the photoconductor 27 is removed by the static elimination light from the static eliminator 31. The copy sheet on which the image is transferred by the transfer device 26 is the photoconductor 2
The image is peeled off by a peeling claw 28 which is arranged so as to be able to come into contact with and detachable from 7, and the image is fixed on the copy sheet by the fixing device 30 and is discharged to the outside of the copying machine body.

3 and 4 are schematic sectional views of the automatic document feeder 4 according to the first embodiment. This automatic document feeder 4
Is a folding manuscript straightening device 80 for picking up an upward manuscript.
It has. The folding document straightening device 80 includes a folding straightening solenoid 36 arranged in front of the original document ingesting roller 7 and a folding straightening member 37 tilted downward by the folding straightening solenoid 36.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 3, the fold correction solenoid 36 conveys the fold correction member 37 rotatably attached. The document is closely fed to the document inside, and the document feeding roller 7 feeds the document.
Only the sheets are transported.

If the original being conveyed is a folded original 90,
When the document feeding is started, the folding correction member 37 for correcting the folded state, which is arranged on the document placing table 38 of the automatic document feeder 4, is in light contact with the surface of the folded document 90. As shown in FIG. 4, the leading end portion of the folding correction member 37 is first caught by the second folding portion 35 of the folded original 90, and the first folding state (3
4) is automatically released, and the folded document is transported by the document transport roller 5, whereby the folding correction member 3
Since 7 holds the state of being caught by the second folding portion 35 of the folded original 90, subsequently, the second folding state (35) is automatically released.

The original in the unfolded state is conveyed to a predetermined position on the original table 12 by the original conveying belt 11 and stopped, and after being optically scanned, the original conveying belt 11, the reversing roller 17, and the discharging roller. Discharged by 16. A flat plain original is smoothly caught in the folding correction member 37, passes through the folding correction member 37, and is conveyed to a predetermined position on the document table 12.

Since the tip of the folding correction member 37 is in light contact with the folded original 90 as described above, the first folded state (34) and the second folded state (as the folded original 90 is fed / conveyed). 35) is also automatically released. Therefore, even if the original set on the original placing table 38 is a plurality of originals in which folded originals are mixed,
When the fed original is the folded original 90, the folded original is automatically released and conveyed. Therefore, the folded original is conveyed to the original table 12 without causing a jam or damage and an image is accurately formed. Therefore, unlike the conventional case, it is not necessary for the operator to temporarily suspend the conveyance to manually correct the folded portion, and continuous conveyance can be performed, so that the efficiency of image formation can be improved.

[Second Embodiment] In the first embodiment,
If the non-folded portion and the folded portion of the folded original 90 are in close contact with each other, the second folded portion 35 may pass through the folding correction member 37 without being caught and the posture may not be corrected. The second embodiment eliminates this inconvenience.

5 and 6 are schematic sectional views of the automatic document feeder 4 according to the second embodiment. This automatic document feeder 4
Is a folding manuscript straightening device 80 for picking up an upward manuscript.
It has. In this folding original correction device 80, a portion 39 of the original placing table 38 on which the original intake roller 7 acts is recessed into a curved shape.

When a document is set on the document table 38 and the copying operation is started by the operation of the operator, the fold correction solenoid 36 causes the fold correction member 37 rotatably attached to come in close contact with the document being conveyed. In a part of the document placing table 38, a part 39 corresponding to the point of action of the document introducing roller 7 is curvedly recessed,
When the original feeding roller 7 is operated to feed the original, and the original 32 is fed until the front end portion 32 of the original 90 reaches the original conveying roller 5, the original 90 is folded as shown in FIG.
The non-folded part of is recessed downward to produce a flexure 40,
Due to this flexure 40, a relatively large gap 41 appears between the unfolded portion and the folded portion. Then, since the tip of the folding correction member 37 is reliably caught by the gap 41, as shown in FIG. 6, the first folded state (34) of the first folded state (34) is automatically set by being caught by the second folded portion 35. The release and the automatic release of the second folded state (35) by holding the state of being caught by the second folding portion 35 surely works, and the conveyance of the posture-corrected folded document to the document table 12 is smooth. Can be done.

[Third Embodiment] In the case of the first embodiment, the first folded state (34) of the folded original 90 is surely released by the folding correction member 37 contacting the upper surface of the original, but the second If the front and back surfaces of the folded portion 35 are in close contact with each other, the folded portion 35 will pass through the folding correction member 37 in that close contact state, and the second folded state (3
5) may not be released. The third embodiment solves this inconvenience.

7 to 9 are schematic sectional views of the automatic document feeder 4 according to the third embodiment. This automatic document feeder 4
Is a folding manuscript straightening device 80 for picking up an upward manuscript.
It has. Similar to the first embodiment, the folding document straightening device 80 has a folding straightening solenoid 36 arranged in front of the original document feeding roller 7 and is tilted downward by the folding straightening solenoid 36 to contact the upper surface of the fed original. The folding correction member 37, another folding correction solenoid 43 arranged between the document invoking roller 7 and the document conveying roller 5, and tilted upward by the folding correction solenoid 43 to contact the lower surface of the fed document. It is composed of a folding correction member 42.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 7, the fold correction solenoid 36 conveys the rotatably mounted fold correction member 37 by the fold correction solenoid 36. Close to the top of the original. Next, the document is fed by the document feeding roller 7 and conveyed until the front end portion 32 of the folded document 90 reaches the document conveying roller 5, so that the folded document 90 is placed on the document table 38 of the automatic document feeder 4. Since the folding correction member 37 is in light contact with the upper surface of the folded original 90, the tip of the folding correction member 37 first catches on the second folding portion 35 of the folded original 90, as shown in FIG. The first folded state (3
4) is automatically released.

However, when both the front and back surfaces of the second folded portion 35 are in close contact with each other, the second folded portion 35 passes through the folding correction member 37 in that close contact state and the second folded state (3
5) is not released. In this case, the folded original 90 is further conveyed by the original conveying rollers 5, and at the same time,
As shown in FIG. 9, another fold correction solenoid 43 brings the rotatably attached fold correction member 42 into close contact with the lower surface of the folded original 90 being conveyed. The folding correction member 42, which is also arranged on the back side of the document, acts on the folded portion on the rear end side of the folded document 90, and
The folded state (35) of (3) is reliably and automatically released.
In this way, the posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected.

[Fourth Embodiment] FIG. 10 is a perspective view of an automatic document feeder 4 according to a fourth embodiment, and FIG. 11 is a side view showing a pressure contact acting portion, which is an enlarged view of a portion A in FIG. is there. 12 and 13 are schematic sectional views of the automatic document feeder 4. In the folding document correcting apparatus 80 according to the fourth embodiment, a pressure contact solenoid 44 is attached to the lower surface of the document placement table 38, and the pressure contact solenoid 44 is placed on the document placement table 38 via an L-shaped arm 62. A pressure contact member 45 that is in light pressure contact with the document is attached.

When an original is set on the original placing table 38 and the copying operation is started by the operation of the operator, as shown in FIGS.
As shown in FIG. 2, when the pressure contact solenoid 44 is extended, the pressure contact member 45 at the end of the rotatably attached arm 62 is lightly pressed against the rear end of the document. Next, the original document is fed by the original document introduction roller 7. It is assumed that the fed document at this time is the folding document 90. Folding manuscript 9
The leading end portion 32 of 0 is fed to the document feeding roller 5, but the trailing end portion 33 of the folded document 90 does not move because the pressure contact member 45 is in light pressure contact. Therefore, when the document conveying roller 5 is subsequently rotated and the leading end portion 32 is conveyed, the frictional force between the rear end portion 33 lightly pressed against the pressure contact member 45 and the pressure contact member 45 is generated at the folding intermediate portion. Since it is stronger than the frictional force, the rear end portion 33 is not moved yet, and the folded middle portion of the folded original 90 is pulled out as shown in FIG. 13, whereby the first folded state (34 ) And the second folded state (35) are both automatically released. In this way, the posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected.

[Fifth Embodiment] FIGS. 14 to 16 are schematic sectional views of an automatic document feeder 4 for picking up an upward document according to a fifth embodiment. In the automatic document feeder 4, the folding document straightening device 80 includes a reversing roller 47 which is in light contact with the rear end of the document on the document table 38 and rotates in the opposite direction to the document transport roller 5. ing.

When the original is set on the original placing table 38 and the copying operation is started by the operation of the operator, the reverse roller 47 is lightly pressed against the rear end of the original as shown in FIG. Next, the document is fed by the document feeding roller 7. When the fed document is the folding document 90, the leading end portion 32 of the folding document 90 is fed to the document feeding roller 5 as shown in FIG. Paper, but folding original 90
The rear end portion 33 is moved in the direction opposite to the document conveyance direction by the reverse rotation of the reverse rotation roller 47.

Subsequently, the document transport roller 5 rotates to transport the leading end portion 32 to the document table 12 side, and at the same time, when the reverse rotation roller 47 moves the rear end portion 33 in the opposite direction, the reverse rotation roller 47 and the rear end portion 33. Since the frictional force between and is stronger than the frictional force at the folding intermediate portion, as shown in FIG.
The folded intermediate portion of the folded original 90 is pulled out, whereby the first folded state (34).
Both the second folded state (35) and the second folded state (35) are automatically released. In this way, the posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected.

[Sixth Embodiment] FIGS. 17 to 19 are schematic sectional views of an automatic document feeder 4 for picking up an upward document according to a sixth embodiment. In the folded document straightening device 80 of the sixth embodiment, the suction fan 48, the duct 49 forming the suction path, and the lower surface of the duct 49 facing the rear end of the document on the document table 38. And an adsorbing portion 50 formed of a porous member.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 17, the fan 48 rotates and is placed at the rear end of the manuscript via the duct 49. The suction portion 50 sucks and lifts the rear end portion 33 of the folded original 90.

Next, as shown in FIG. 18, the document is fed by the document feeding roller 7, and the leading end 32 of the folded document 90 is fed to the document transport roller 5, but the trailing end of the folded document 90 is fed. Since 33 is sucked and held by the suction unit 50, it does not move. Therefore, when the document conveying roller 5 is subsequently rotated and the leading end portion 32 is conveyed, the suction force of the rear end portion 33 by the suction portion 50 is stronger than the friction force of the folding middle portion, and the rear end portion is sucked by the suction. Since the portion 33 is lifted up, the frictional force at the folding intermediate portion is reduced, so that as shown in FIG.
The leading end portion 32 of 0 is conveyed, but the rear end portion 33 is fixed, and the folding intermediate portion is pulled out by the conveying force of the document conveying roller 5. This causes the first folded state (34) and the second folded state (3
Both 5) are automatically released. The suction friction force of the suction unit 50 is weaker than the transport force of the document transport roller 5. Therefore, after the folded state is released and the sheet is flattened, the rear end portion 33 of the rear end portion 33 is moved by the transport force of the document transport roller 5. Get away from. In this way,
The posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected.

[Embodiment 7] FIGS. 20 and 21 are schematic sectional views of an automatic document feeder 4 for feeding a downward document according to a seventh embodiment in a trade-in manner. In the folding document straightening device 80 of the automatic document feeding device 4, the document pressing solenoid 51 disposed substantially above the document introduction roller 7 and the leading end portion of the fed document being tilted downward by the document pressing solenoid 51. The second document folding section 35 of the original document 90, in which the original document pressing section 52 to be pressed and the second half of the original placing table 38 are slightly raised with respect to the first half.
And a step 53 for abutting.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 20, the manuscript pressing solenoid 51 folds the manuscript pressing portion 52 rotatably arranged to fold the manuscript. 90 tip 3
The sheet is lightly pressed against the sheet 2 and is fed by the sheet feeding roller 7 until it reaches the sheet conveying roller 5. When the document transport roller 5 subsequently transports the front end portion 32, as shown in FIG. 21, the step 53 of the document mounting table 38 at the rear end portion 33 is formed.
The second folded portion 35 is caught by the first folded state (34) and the first folded state (34) is automatically released. When the document is further transported by the document transport roller 5, the step 53 holds the state in which the second folding portion 35 of the folded document 90 is hooked, so that the second folded state (35) is automatically released. To do. In this way, the folded state can be automatically released even when the document is fed in the downward direction or in the trade-in mode. The posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected.

[Embodiment 8] FIGS. 22 and 23 are schematic sectional views of an automatic document feeder 4 for feeding a downward document according to an eighth embodiment in a trade-in manner. In the folding manuscript straightening device 80 of the automatic manuscript feeding device 4, as in the case of the seventh embodiment, the manuscript pressing solenoid 51 disposed substantially above the manuscript taking-in roller 7 and the manuscript pressing solenoid 51 moves downward. A document holding unit 52 that tilts to hold the leading end of the fed document and a document placing table 38
The second half of the first half is slightly higher than the first half, and the second folding portion 35 of the folded original 90 is brought into contact with the step 53.
And a folding portion detection sensor 54 provided at the upper and lower central portions of the step 53 to detect the tip of the second folding portion 35 of the folded original 90. Then, when the folding portion detection sensor 54 is activated, the document conveyance speed is set to be slower than in the normal state.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 22, the manuscript pressing solenoid 51 folds the manuscript pressing portion 52 rotatably arranged to fold the manuscript. 90 tip 3
The sheet is lightly pressed against the sheet 2 and is fed by the sheet feeding roller 7 until it reaches the sheet conveying roller 5. Subsequently, when the document transport roller 5 transports the leading end portion 32, as shown in FIG. 23, the step 53 of the document placing table 38 at the rear end portion 33.
The second folding portion 35 comes into contact with the second folding portion 35, and the folding portion detection sensor 54 provided on the step 53 operates, so that the fed original is determined to be the folded original 90, and as a result, the automatic document feeder 4 The conveyance speed of is set lower than the conveyance speed in the case of a normal flat ordinary document.

Subsequently, when the document conveying roller 5 conveys the leading end portion 32 of the folded original 90 at a low speed, the second folding portion 35 is caught at the step 53 of the original placing table 38 at the rear end portion 33, and The folded state (34) of 1 is automatically released. When the document is further transported by the document transport roller 5, the step 53 holds the state in which the second folding portion 35 of the folded document 90 is hooked, so that the second folded state (35) is automatically released. To do. In this way, the folded state can be automatically released even when the document is fed in the downward direction or in the trade-in mode. Then, since the transport speed at the time of releasing the folded state is made low, the releasing operation of the folded state is performed gently,
While reliably preventing jamming and document damage, the posture-corrected folded document is conveyed to a predetermined position on the document table 12, stopped, optically scanned, and then ejected.

[Ninth Embodiment] FIGS. 24 and 25 are schematic sectional views of an automatic document feeder 4 according to a ninth embodiment for feeding a downward document in a trade-in manner. In the folding manuscript straightening device 80 of the automatic manuscript feeding device 4, as in the case of the eighth embodiment, the manuscript holding solenoid 51 arranged substantially above the manuscript taking-in roller 7 and the manuscript holding solenoid 51 downwards. A document holding unit 52 that tilts to hold the leading end of the fed document and a document placing table 38
The second half of the first half is slightly higher than the first half, and the second folding portion 35 of the folded original 90 is brought into contact with the step 53.
A groove 55 that is formed in the step 53 to allow the tip of the second folding portion 35 of the folded document 90 to slightly enter, and a second folding portion 35 that is arranged at the entrance of the central portion of the groove 55. Folding part detection sensor 5 that detects the tip
4 is provided. Then, when the folding portion detection sensor 54 is activated, the document conveyance speed is set to be slower than in the normal state.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 24, the manuscript pressing solenoid 51 causes the manuscript pressing portion 52 rotatably arranged to fold the manuscript. 90 tip 3
The sheet is lightly pressed against the sheet 2 and is fed by the sheet feeding roller 7 until it reaches the sheet conveying roller 5. Then, the step 53
The groove 55 is formed in the groove, and the second folding portion 35 of the folded original 90 enters the groove 55 as shown in FIG. 25. Therefore, it is detected that the second folding portion 35 reaches the step 53. It can be reliably detected by the sensor 54.
Since the folding portion detection sensor 54 operates, it is determined that the fed original is the folded original 90, and as a result, the conveyance speed of the automatic document feeder 4 is higher than the conveyance speed of a normal flat ordinary document. Is set low.

Subsequently, when the document conveying roller 5 conveys the leading end portion 32 of the folded original 90 at a low speed, the second folding portion 35 is caught at the step 53 of the original placing table 38 at the rear end portion 33, and The folded state (34) of 1 is automatically released. When the document is further transported by the document transport roller 5, the step 53 holds the state in which the second folding portion 35 of the folded document 90 is hooked, so that the second folded state (35) is automatically released. To do. In this way, the folded state can be automatically released even when the document is fed in the downward direction or in the trade-in mode. Then, since the transport speed at the time of releasing the folded state is made low, the releasing operation of the folded state is performed gently,
While reliably preventing jamming and document damage, the posture-corrected folded document is conveyed to a predetermined position on the document table 12, stopped, optically scanned, and then ejected. Particularly in the case of the present embodiment, since the groove 55 is formed in the step 53 and the folding portion detection sensor 54 is arranged at the entrance of the groove 55, the second folding portion 35 of the folded original 90 has reached the step 53. Will be very accurate.

[Embodiment 10] FIG. 26 shows Embodiment 1.
27 to 29 are enlarged views of the main parts for explaining the operation, showing a schematic cross section of the automatic document feeder 4 for feeding the downward document according to No. 0 in trade-in. This automatic document feeder 4
In the folding document straightening device 80, a document pressing solenoid 51 disposed substantially above the document introduction roller 7 and a document pressing unit 52 tilted downward by the document pressing solenoid 51 to press the leading end of the fed document. , So that the tip end thereof is located slightly below the tangent 56 extending from the contact point between the original document feeding roller 5 and the original document separating roller 6 and located on the upper side between the original document ingesting roller 7 and the original document conveying roller 5. And a folding document correction guide 57 provided in the.
It should be noted that in this embodiment, the step 53 on the document placing table 38 seen in the previous embodiment is not provided.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 26, the manuscript pressing solenoid 51 causes the manuscript pressing portion 52 rotatably arranged to fold the manuscript. 90 tip 3
The sheet is lightly pressed against the sheet 2 and is fed by the sheet feeding roller 7 until it reaches the sheet conveying roller 5. Subsequently, the folded original 90 is conveyed by the original conveying rollers 5, and the rear end portion 33 of the folded original 90 is folded by the original correction guide 5.
When it reaches the position 7, as shown in FIG. 28, the second folding portion 35 of the folded document 90 is pushed downward by the folding document correction guide 57, and the first
The folded state (34) is automatically released. Further, the folded original correction guide 57 acts on the rear end portion 58 of the folded original 90 as shown in FIG.
The second folded state (35) of the folded original 90 is automatically released. In this way, the posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected. In the case of the present embodiment, the structure is extremely simple.

[Embodiment 11] In the tenth embodiment, when the rear end portion 33 of the folded original 90 is closely attached to the front and back sides, the first folding portion 34 and the second folding portion 35 are closely attached to each other. There is a possibility that the posture may not be corrected because the document passes through the folding document correction guide 57 as it is.
The eleventh embodiment eliminates this inconvenience.

FIG. 30 shows a schematic cross section of an automatic document feeder 4 for feeding a downward document according to the eleventh embodiment in a trade-in manner. FIGS. 31 to 33 are enlarged views of a main part for explaining the operation. . In the folding document straightening device 80 of the automatic document feeding device 4, the document pressing solenoid 51 disposed substantially above the document introduction roller 7 and the leading end portion of the fed document being tilted downward by the document pressing solenoid 51. The document pressing portion 52 to be pressed, and the tip end thereof is slightly lower than a tangent line 56 extending from the contact point between the document conveying roller 5 and the document separating roller 6, which is located on the upper side between the document feeding roller 7 and the document conveying roller 5. The folding document straightening guide 57 provided so as to project to the upper side, and the tip end portion thereof is slightly above the tangent line 56 on the lower side between the folding document straightening guide 57 and the document feeding roller 5. The folding document correction guide 59 is provided so as to be protruded up to.

When a manuscript is set on the manuscript table 38 and the copying operation is started by the operation of the operator, as shown in FIG. 30, the manuscript pressing solenoid 51 folds the manuscript pressing portion 52 rotatably arranged to fold the manuscript. 90 tip 3
The sheet is lightly pressed against the sheet 2 and is fed by the sheet feeding roller 7 until it reaches the sheet conveying roller 5. Subsequently, the folded document 90 is transported by the document transport roller 5,
As shown in FIG. 2, when the rear end portion 33 of the folded original 90 reaches the position of the folding original correction guide 57, the second folding portion 35 of the folded original 90 is pushed downward by the folding original correction guide 57, and Definitely one more
Even if the folded portions are first brought into close contact with each other by being caught by the two folding original correction guides 59, FIG.
As shown in, the first folded state (34) is automatically and reliably released. Further, as shown in FIG. 33, the folding original correction guide 57 is provided on the rear end portion 5 of the folding original 90.
8 to automatically release the second folded state (35) of the folded original 90. In this way, the posture-corrected folded document is conveyed to a predetermined position on the document table 12 without being jammed or damaged, stopped, optically scanned, and then ejected. In the case of the present embodiment, the structure is extremely simple.

[0052]

According to the image forming apparatus of the first aspect of the present invention, the folding state is automatically released by hooking the folding portion of the folded original fed by the folding correction member. Even if the originals set in are multiple originals that include folded originals, you can correct the posture of the folded originals and convey them to the original table to form images without causing jams or damage to the originals. Since all the originals can be continuously conveyed without the operator having to move their hands, the efficiency of image formation can be improved.

According to the second aspect of the image forming apparatus of the present invention, since the pressure contact member is lightly pressed against the rear end portion which is the folding portion of the folded document, the front end portion of the folded document is fed. The rear end does not move due to light pressure contact, and the frictional force between the rear end that is the folding part and the pressure contact member is stronger than the frictional force at the folding middle part, so the folding middle part is pulled out. , The folded state is automatically released. Therefore, even if the original set on the original placing table is a plurality of originals in which folded originals are mixed, the orientation of the folded originals is corrected and the images are conveyed to the original tray without causing jams or damage to the originals. Since all the originals can be continuously conveyed without the operator having to move them, the efficiency of image formation can be improved.

According to the third aspect of the image forming apparatus of the present invention, even if the front end of the folded original is fed, the rear end, which is the folding part, is moved in the opposite direction by the reversing roller that is lightly pressed against it. Since the frictional force between the rear end that is the folding part and the reverse roller is stronger than the frictional force at the folding middle part, the folding middle part is pulled out and the folded state is automatically Will be released. Therefore, even if the original set on the original placing table is a plurality of originals in which folded originals are mixed, the orientation of the folded originals is corrected and the images are conveyed to the original tray without causing jams or damage to the originals. Since all the originals can be continuously conveyed without the operator having to move them, the efficiency of image formation can be improved.

According to the image forming apparatus of claim 4 of the present invention, when the front end portion of the folded original is conveyed, the second folding portion of the folded original catches on the step of the original placing table at the rear end, and the first folding portion Automatically cancels the folded state and further conveys the front end portion, the step maintains the state in which the second folded portion of the folded document is hooked, so the second folded state is also automatically released. . In this way, even if the document is fed in the downward direction or in the trade-in state, the folded state can be automatically released, and the image can be formed by being conveyed to the document table without causing a jam or the document being damaged. Since all originals can be continuously conveyed without the need to move their hands, the efficiency of image formation can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a cross-sectional configuration of a copying machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a folded document used in the copying machine according to the embodiment.

FIG. 3 is a schematic sectional view of the automatic document feeder according to the first embodiment.

FIG. 4 is a schematic sectional view showing the operation of the automatic document feeder according to the first embodiment.

FIG. 5 is a schematic sectional view of an automatic document feeder according to a second embodiment.

FIG. 6 is a schematic sectional view showing the operation of the automatic document feeder according to the second embodiment.

FIG. 7 is a schematic sectional view of an automatic document feeder according to a third embodiment.

FIG. 8 is a schematic cross-sectional view showing the operation of the automatic document feeder according to the third embodiment.

FIG. 9 is a schematic sectional view showing the operation of the automatic document feeder according to the third embodiment.

FIG. 10 is a perspective view of an automatic document feeder according to a fourth embodiment.

FIG. 11 is a side view showing a pressure contact acting portion according to the fourth embodiment.

FIG. 12 is a schematic sectional view showing an operation of the automatic document feeder according to the fourth embodiment.

FIG. 13 is a schematic cross-sectional view showing the operation of the automatic document feeder according to the fourth embodiment.

FIG. 14 is a schematic sectional view of an automatic document feeder according to a fifth embodiment.

FIG. 15 is a schematic sectional view showing the operation of the automatic document feeder according to the fifth embodiment.

FIG. 16 is a schematic sectional view showing an operation of the automatic document feeder according to the fifth embodiment.

FIG. 17 is a schematic sectional view of an automatic document feeder according to a sixth embodiment.

FIG. 18 is a schematic sectional view showing an operation of the automatic document feeder according to the sixth embodiment.

FIG. 19 is a schematic sectional view showing the operation of the automatic document feeder according to the sixth embodiment.

FIG. 20 is a schematic sectional view of an automatic document feeder according to a seventh embodiment.

FIG. 21 is a schematic sectional view showing the operation of the automatic document feeder according to the seventh embodiment.

FIG. 22 is a schematic sectional view of an automatic document feeder according to the eighth embodiment.

FIG. 23 is a schematic sectional view showing the operation of the automatic document feeder according to the eighth embodiment.

FIG. 24 is a schematic sectional view of an automatic document feeder according to the ninth embodiment.

FIG. 25 is a schematic sectional view showing the operation of the automatic document feeder according to the ninth embodiment.

FIG. 26 is a schematic sectional view of an automatic document feeder according to the tenth embodiment.

FIG. 27 is an enlarged view of the essential parts showing the operation of the automatic document feeder according to the tenth embodiment.

FIG. 28 is an enlarged view of a principal part showing the operation of the automatic document feeder according to the tenth embodiment.

FIG. 29 is an enlarged view of the essential parts showing the operation of the automatic document feeder according to the tenth embodiment.

FIG. 30 is a schematic sectional view of an automatic document feeder according to the eleventh embodiment.

FIG. 31 is an enlarged view of essential parts showing the operation of the automatic document feeder according to the eleventh embodiment.

FIG. 32 is an enlarged view of a main part showing the operation of the automatic document feeder according to the eleventh embodiment.

FIG. 33 is an enlarged view of a main part showing the operation of the automatic document feeder according to the eleventh embodiment.

FIG. 34 is a perspective view showing a folded document to be handled by the present invention.

FIG. 35 is a side view showing a long folding original which is a target of handling by a copying machine disclosed in Japanese Patent Laid-Open No. 4-86754 as prior art.

[Explanation of symbols]

 4 ... Automatic document feeder 5 ... Original conveying roller 6 ... Original separating roller 7 ... Original feeding roller 11 ... Original conveying belt 12 ... Original plate 27 ... Photoconductor 32 ... Tip 33 ... Rear End portion 34 ... First folding portion 35 ... Second folding portion 36 ... Folding correction solenoid 37 ... Folding correction member 38 ... Original document table 40 ... Deflection 41 ... Gap 42 ... Folding correction member 43 ...... Folding correction solenoid 44 ...... Pressure contact solenoid 45 ...... Pressure contact member 47 …… Reverse roller 48 …… Suction fan 49 …… Duct 50 …… Suction part 51 …… Document holding solenoid 52 …… Document holding part 53 …… Step 54 …… Folding part detection sensor 55 …… Groove 56 …… Tangential line between the document feed roller and document separation roller 57 …… Folded document correction Ido 59 ...... folding manuscript correction guide 80 ...... folding manuscript correcting device 90 ...... folding manuscript

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hidenori Onishi 22-22 Nagaike-cho, Abeno-ku, Osaka, Osaka Co., Ltd. (72) Inventor Shinji Kato, 22-22 Nagaike-cho, Abeno-ku, Osaka, Osaka

Claims (4)

[Claims] 1. An automatic document feeder having an original placing table on which a plurality of originals are set, means for feeding the originals on the original placing table one by one, and an original fed in contact with the fed originals. An image forming apparatus comprising a folding correction member that automatically releases the folded state by hooking the folding portion when the document is a folded document. 2. An automatic document feeder having an original placing table for setting a plurality of originals is provided with means for feeding the originals on the original placing table one by one, and the originals on the original placing table are fed. An image forming apparatus characterized in that a pressure contact member is provided to lightly press the rear end portion and prevent the rear end portion from moving when the front end portion of a document is fed. 3. An automatic document feeder having an original placing table for setting a plurality of originals is provided with means for feeding the originals on the original placing table one by one, and the originals on the original placing table An image forming apparatus characterized in that a reverse rotation roller is provided, which is pressed against the rear end of the document and rotates in the direction opposite to the paper feeding direction when the front end of the original is fed. 4. An automatic document feeder having an original placing table for setting a plurality of originals facing downward is provided with means for feeding the originals on the original placing table one by one in trade-in, and the original placing table. The image forming apparatus is characterized in that the second half of the first half is slightly higher than the first half and a step is provided so that the second folding part of the folded original abuts.