JP2002046893A - Automatic document feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic document feeding device ADF for an image reading device easily capable of eliminating a jammed document without damaging it. SOLUTION: This ADF 30 is provided with a document tray 31, first to third feed rollers 32a-35a, a carry-in and carry-out means 34, a pair of sheet discharge guide rollers, first to third jam detection sensors 41-43, a supply sheet cover 51, a discharged sheet cover 52, a supply sheet cover sensor 51a, and a discharged sheet cover sensor 52a. Above feed rollers 32a-35a can be rotated normally and reversely by a motor and manually. In the case either of the jam detection sensors 41-43 detects a jam, when the ADF 30 determines that a document P can be discharged by normal or reverse rotation of one of the feed rollers 32a-35a close to a jam generated position without damaging the document P, this result of determination is displayed in an operation and display panel, and as an operator opens the cover 51 or 52 at the jam generated position, the subject one of the feed rollers 32a-35a is rotated normally or reversely by the motor at a specified time after that to discharge the jam document P through a cover opened part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder mounted on an image reading apparatus such as a copying machine, a facsimile machine, a composite facsimile machine, a scanner, and the like, and more particularly, to a document jam (paper jam) in the automatic document feeder. The present invention relates to a technology for facilitating the elimination of originals when they occur.

[0002]

2. Description of the Related Art Conventionally, an automatic document feeder (hereinafter, referred to as a "document") is placed on a contact glass of an image reading device of a copying machine (or the like).
ADF) is provided to open and close the contact glass. In the ADF, when a jam occurs due to a conveyance failure on a document conveyance path (including a paper discharge path), when removing the jammed document, an opening / closing cover provided on the document conveyance path is opened to open the document conveyance path. After the jam document is manually removed, the opening and closing cover is closed, and the ADF
When the document is opened and closed, a jam release signal is generated, whereby the automatic document conveyance is restarted.

However, in the case of a conventional ADF, when a paper jam occurs, only the operator is notified of the jam, and this notification is displayed on a touch panel, which is an operation unit in a copying machine, for example. Also, the jammed document, that is, the jammed document, is sandwiched between a pair of opposing rollers which are feed rollers (conveying rollers), and a gear provided at an end of the feed roller is driven by a rotation driving mechanism. Since the gear is meshed with the gear provided on the output shaft, it is not possible to easily remove the jammed document. Therefore, there is a high risk that the original will be damaged if the original is forcibly removed. Further, there is also a complication that the operator has to remove the pre-fed document (problem 1).

When the ADF is operated via a computer, even if a paper jam occurs,
There was a problem that the state of the ADF could not be immediately confirmed (problem 2).

[0005]

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to solve the above-described problem of eliminating a jammed document in the conventional automatic document feeder, and to simply and easily remove the jammed document without damaging it. Can be eliminated,
That is, an object of the present invention is to provide an automatic document feeder for an image reading apparatus, which solves the above problem 1.

A second object of the present invention is to provide an automatic document feeder for an image reading apparatus which solves the above problem 2.

[0007]

An automatic document feeder according to a first aspect of the present invention conveys a document on a document table to a reading section of an image reading apparatus by a feed roller capable of rotating forward and backward. An automatic document feeder that collects the document on the paper output tray, detects a jammed document near the entrance as a jam detection sensor near the entrance of the document conveyance / discharge path, and sends the document to the feeder. Equipped with a device to determine whether or not it is at a position that can be eliminated by reverse rotation of the roller,
When the jam detection sensor determines that the document can be removed, the document is eliminated by reverse rotation of the feed roller, and when it is determined that elimination by reverse rotation of the feed roller is not possible, The determination result is notified to the operator.

An automatic document feeder according to a second aspect of the present invention is configured such that a document on a document placing table is transported toward a reading section of an image reading apparatus by a feed roller which can be rotated forward and backward, and then is discharged to a sheet discharge tray. An automatic document feeder for recovering an original document, wherein a jam detection sensor is provided in a document transfer / discharge path, an openable / closable cover capable of opening a proper position in the transfer / discharge path, and the opening of the cover is detected. A cover sensor, the jam detecting sensor detects a jam of the document, and the automatic document feeder can remove the document without damaging the document by forward or reverse rotation of a feed roller near the jam occurrence position. When the apparatus makes a determination, the result of the determination is notified to the operator, and when the operator opens the cover at the jam occurrence position, the feeding row near the cover opening portion is opened. There was forward or reverse by the driving mechanism, characterized in that jammed sheets through the cover opening has to be eliminated.

In the automatic document feeder according to the second invention, it is preferable that the rotation speed of the feed roller when the jammed document is eliminated is lower than the document transfer speed when reading the document.

In the automatic document feeder according to the second invention, the jam detection sensor detects a jam of the document,
When the automatic document feeder determines that the document cannot be removed without damaging the document by the forward or reverse rotation of the feed roller, the operator is notified of the determination result. Is preferred.

According to a third aspect of the present invention, there is provided an automatic document feeder, comprising: a document table, a paper discharge tray, a transport control unit for controlling a document transport operation; An operation / display panel for displaying the operation status and operation instruction contents of the document feeder, and a first feeder for feeding the documents one by one from the bundle of documents on the document table to the reading section of the image reading device. Document separating / feeding means comprising a forward / reversely rotatable feed roller, and document carrying means comprising a second forward / reversely rotatable feed roller for further transporting the document from the document separating / feeding means toward the reading section. And a document loading / unloading means comprising an endless running belt for further transporting the document from the document loading means toward the reading section and stopping at the document reading section, and placing the read document on the paper output tray. Third forward / reverse discharging to A paper discharge unit consisting of freely feeding roller, provided in the vicinity of the document separating and feeding means, a first jam detection sensor for detecting the non-feed jam of the original,
A second jam detection sensor provided in the vicinity of the document carry-in means and configured to detect a stagnant jam of the document, and a third jam detection sensor provided in the vicinity of the paper discharge means to determine a paper-discharge impossible jam; A paper feed cover for opening and closing the vicinity of the document separating / feeding means and the vicinity of the document carrying means;
A first cover which opens and closes the vicinity of the sheet discharging means, a sensor which detects opening and closing of the sheet supply cover, and a sensor which detects opening and closing of the sheet discharge cover; When any one of the detection sensors detects a jam, and the transport control unit determines that the jam document can be eliminated without damaging the document by forward or reverse rotation of the feed roller near the jam occurrence position. Is notified to the operator, and when the operator opens the paper feed cover or the discharge cover, which is the cover at the jam occurrence position, by the forward or reverse rotation of the feed roller by the driving mechanism, It is characterized in that a jam document is eliminated through an opening.

In the automatic document feeder according to the third aspect of the present invention, the jam detection sensor detects a jam, and removes the jam document without damaging the document by forward or reverse rotation of the feed roller. It is preferable that when the transport control unit determines that the operation cannot be performed, the result of the determination is notified to an operator.

In the automatic document feeder of the third invention,
In addition to the above configuration, when any one of the first to third jam detection sensors detects a jam, the jammed document is damaged by the forward or reverse rotation of the feed roller near the jam occurrence position. When the transport control unit determines that the feed roller can be eliminated without notification, the result of the determination is notified to the operator, and the feed roller is operated only while the operator performs a specific operation on the operation / display panel. It is desirable to have a configuration that allows normal rotation or reverse rotation.

Further, in the automatic document feeder according to the third invention, in addition to the above-described configuration, when any of the first to third jam detection sensors detects a jam, the operator is notified to that effect. In addition, irrespective of the judgment of the transport control unit, the feed roller is rotated forward or backward only while the operator is performing a specific operation on the operation / display panel. It is desirable.

In the automatic document feeder according to the third aspect of the present invention, the feed roller is driven by the drive mechanism to move the document at the time of reading the document only while the operator performs a specific operation on the operation / display panel. It is preferable that the motor is configured to be rotated forward or backward at a lower speed.

In the automatic document feeder according to the third invention, in addition to the above configuration, a sensor for detecting the opening and closing of the paper feed cover or a sensor for detecting the opening and closing of the paper discharge cover opens the covers. It is preferable that a configuration is provided in which the feed control unit enables manual forward / reverse rotation of the feed roller when the feed roller is detected.

Further, in the automatic document feeder according to the third invention, in addition to the above configuration, a sensor for detecting opening and closing of the paper feed cover or a sensor for detecting opening and closing of the paper discharge cover is used to open these covers. It is desirable that the transport control unit be configured to enable the drive mechanism to rotate forward or reverse at a speed lower than the document transport speed at the time of document reading when the detection is performed.

Further, in the automatic document feeder according to the third invention, the transfer control section is connected to a computer system,
When the jam occurs, the jam occurrence position is notified to the computer side, and the operator operates the computer, whereby the computer notifies the transport control unit,
It is desirable that the feed roller be configured to request removal of jam by forward rotation or reverse rotation.

Further, in the automatic document feeder according to the second and third inventions, the jam detection sensor may be
A device for detecting a change in load applied to the drive motor of the feed roller when a document is currently being conveyed is further provided. When a sudden increase in load is detected, the drive motor rotates forward or reverse. It is preferable to configure.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a block diagram showing a configuration of a control system of a copying machine as an image reading apparatus provided with an ADF of the present invention.
FIG. 2 is a schematic sectional view showing the entire structure of the ADF provided on the copying machine. The control system includes a control unit 1, a memory 2, a reading unit 3, an image processing unit 4, a transport control unit 5, and a sensor 6 (first to third jam detection sensors 41 to 41 described later).
43, a paper feed cover sensor 51a, a paper discharge cover sensor 52a, etc.) and a touch panel type operation / display panel 8 also serving as an operation unit.

The control section 1 has a CPU for controlling the entire copying machine 21. The memory 2 has a ROM and a RAM that store programs for control by the CPU and various data necessary for control. The reading unit 3 reads an image, the image processing unit 4 processes the read image, and the conveyance control unit 5 controls document conveyance by the ADF. Among the sensors 6, the first to third jam detection sensors 41 to 43 are sensors for detecting a paper jam (jam original) and a position where the jam occurs,
The paper feed cover sensor 51a is a sensor that detects opening and closing of the paper feed cover, and the paper ejection cover sensor 52a is a sensor that detects opening and closing of the paper ejection cover.

In FIG. 2, a contact glass 22 constituting the reading section 3 is provided on the upper surface of the copying machine 21. The ADF 30 of the present invention is provided above the copying machine 1.
To open and close the contact glass 22 (to allow lift-up / lift-down).
1 is connected via a hinge (not shown).

The ADF 30 has the following. That is, the ADF 30 includes (1) a document tray 31 as a document mounting table on which a document bundle (not shown) including a plurality of documents can be placed, and (2) a document from the document bundle placed on the document tray 31. Documents P separated after being separated one by one
(3) Separating / feeding means 32 composed of first feed rollers 32a and 32b which can be rotated forward and backward, and (3) originals from the separating / feeding means 32 are further conveyed to the contact glass 22. A carrying means 33 comprising second feed rollers 33a and 33b which can be rotated forward and backward, and (4) the document from the carrying means 33 is further carried and stopped on the contact glass 22 and then read. And (5) a document output tray provided below the document tray 31 for carrying out the document carried out by the carrying-in / out means 34, which comprises an endless running belt (conveying belt) 34a. Paper discharge on 36
A paper discharge means 35 comprising a third feed roller 35a and a pair of paper discharge guide rollers 35b, 35b which can be collected and rotated forward and backward, and (6) first to third jam detection sensors 41 to 41.
43, (7) a paper feed cover sensor 51a and a paper discharge cover sensor 52a, and (8) a paper feed cover 51 and a paper discharge cover 52 described later.

The first to third feed rollers 32a, 32
Reference numerals 2b, 33a, 33b, and 35a denote drive motors (not shown) which are rotatable in forward and reverse directions (separation / feed motor, carry-in motor,
And a paper discharge motor), and is driven to rotate forward and reverse by an output signal from the transport control unit 5.

The loading / unloading means 34 includes the transport belt 34a, a driving roller 34b and a driven roller 34c provided at both ends of the transport belt, and the transport belt 3a.
4a, a plurality of pressure rollers 34d for pressing the conveyor belt 34a against the contact glass 22 are provided. The drive roller 34b is driven by a motor (not shown).

A first jam detection sensor 41 for detecting a non-feeding jam of a document near the first feed rollers 32a, 32b detects a jam of the document near the second feed rollers 33a, 33b. A second jam detection sensor 42 is provided near the third feed rollers 35a and 35b.

The first feed rollers 32a, 32
b and the second feed rollers 33a, 33b
, A paper discharge cover 52 that opens and closes near the third feed roller 35a and the paper discharge guide roller 35b, and a paper feed cover sensor 51a.
And the paper ejection cover sensor 52a.

In the ADF 30, the first through the first
When any of the third jam detection sensors 41 to 43 detects a jam, if the jam document can be eliminated without damaging the document P due to forward or reverse rotation of the feed roller near the jam occurrence position, When the transport control unit 5 makes a determination, the determination is displayed on the operation / display panel 8. Then, the operator sets a paper feed cover 51 or a paper discharge cover 52 which is a cover at the jam occurrence position.
Is released, the feed motors 32a, 32b, and 33 are driven by the drive motor after a predetermined time (for example, three seconds).
When a required roller among the rollers a, 32b, 35a, and 35a rotates forward or backward, the jammed document is eliminated through the cover opening.

The action of the jam document elimination will be described in detail. The transport control unit 5 determines whether the document is jammed on each transport path due to the jam based on the detection information from the jam detection sensors 41 to 43. It is determined whether or not. For example, if the jam detection sensor 41 does not detect the trailing edge of the document for a predetermined time or longer, it is determined that the document has been jammed on the feed rollers 32a and 32b (separation / feeding means). to decide. The transport control unit 5
In addition to this determination, the jammed original can be eliminated without damaging the original when the feed roller rollers 32a, 32b are rotated forward or backward by the motor (YE
S) or not (NO) cannot be excluded.

When the determination is YES, the determination (determination result) is displayed on the operation / display panel 8, and when the operator opens the paper feed cover 51, which is the cover at the jam occurrence position, the drive is stopped. Feed roller 32 by motor
By the forward or reverse rotation of a and 32b, the jam document is removed through the cover opening. It is desirable that the rotation speed of the feed roller in the forward / reverse rotation is lower than the document transport speed at the time of reading the document, and it is possible to eliminate the risk of damaging the document more safely and more securely. . The determination of YES or NO is made based on the position where a jam occurs, the length of the document, and the like. For example, when the jam document is a large one such as A3 type, the determination of NO In addition, it is determined that the jammed document cannot be eliminated without damaging the document by the forward / reverse rotation operation of the feed roller driven by the motor.

A more specific description will be given of the operation of eliminating the jammed document when the determination of YES is made in the ADF 30 of FIG. (1) When a jam occurs on the first feed rollers 32a and 32b, these feed rollers are reversed. (2) When a jam occurs between the first feed rollers 32a and 32b and the second feed roller rollers 33a and 33b, in parallel with the normal rotation of the first feed roller,
Reverse the second feed roller. (3) When a jam occurs on the second feed rollers 33a and 33b, these feed rollers are reversed. (4) When a jam occurs on the third feed roller 35a, the feed rollers 35a and 35b are reversed.

In contrast to the above, if the jam detection sensor detects a jam and the jammed document cannot be removed without damaging the document by the forward or reverse rotation of the feed roller, the document is conveyed. When the control unit 5 makes a determination, this “NO determination” is displayed on the operation / display panel 8. In this case, the operator opens the paper feed cover 51 or the paper discharge cover 52 and manually removes the jammed document.

The operation in the first embodiment is shown in the flowchart of FIG. When reading of an image is started by touching a "start key", which is one of the touch switches of the operation / display panel 8, a document transport process is performed according to a command from the transport controller 5 (S1). Jam detection sensor (any one of first to third jam detection sensors 41 to 43)
Then, the transport controller 5 determines whether a paper jam has occurred (S2). If the result of the determination operation is “No”, the document transport process is continued.

When the result of the judgment operation is "occurrence", the paper jam position (jam occurrence position) is confirmed by the transport control unit 5, and the jam original is rotated forward by the feed roller near the jam occurrence position. Alternatively, the conveyance control unit 5 determines whether or not the document can be removed without causing damage to the document due to the reverse rotation (S3). When the result of the determination is "removable", the jam document is removed as described above (S
4). When the judgment result is “impossible to exclude”, the judgment is displayed on the operation / display panel 8. The operator confirms this and manually removes the jam document (S5).

As described above, it is confirmed that the ADF 30 according to the first embodiment can remove a jammed document without damaging the document, instead of forcibly removing the jammed document by a simple automatic forward / reverse operation of the feed roller. Only in
Since the document is configured to be automatically removed, the jam document can be easily removed without further damage. Note that the above-described jam elimination structure and method can be applied to various types of ADFs, and can be applied to a sheet-through DF or the like as they are, and a greater effect can be obtained if the transport distance is short.

FIG. 4 is a schematic sectional view of a main part showing a modification of the ADF 30 of FIG. In this ADF, a first feed roller 32a, 32b and a second feed roller 33a, 33
An ADF cover 61 capable of opening the ADF 3b is provided.
By opening the cover 61 and rotating the first feed roller and / or the second feed roller forward and / or reverse, the jammed document near these feed rollers is eliminated in the direction of the thick arrow. ing.

Second Embodiment In addition to the configuration of the first embodiment, this ADF can perform the operation shown in the flowchart of FIG. In FIG. 5, S11 and S12 are the same as S1 and S2 in FIG. 3, but when any of the first to third jam detection sensors 41 to 43 detects a jam, the jam document is replaced with the jam. The jam occurrence position is immediately displayed on the operation / display panel 8 without the conveyance control unit 5 judging whether or not the document can be removed without damaging the original by the forward or reverse rotation of the feed roller near the occurrence position ( S13, S1
4).

In this case, the operator determines whether or not the jam can be eliminated without damaging the document on behalf of the transport control unit 5. While the user is performing a specific operation (for example, an operation of touching the “jam elimination key” with the finger) on the operation / display panel 8, the feed rollers 32 a to 35 a
The required roller is rotated forward or backward to eliminate the jam (S15). On the other hand, when it is determined that “exclusion is impossible”, the operator manually (manually)
Then, the required feed roller is rotated forward or backward to eliminate the jam (S16). In the second embodiment, either one of the operation in FIG. 3 and the operation in FIG.
Can be selected by It is desirable that the rotation speed of the forward / reverse rotation of the feed roller by the motor at the time of “removal possible” is lower than the document conveyance speed at the time of reading the document, so that there is a danger that the document may be damaged more safely. It can be lowered and eliminated.

Third Embodiment An ADF according to the third embodiment is obtained by adding the following configuration to the configuration of the first embodiment. That is, only when the paper feed cover sensor detects the opening of the paper feed cover or when the paper ejection cover sensor detects the opening of the paper ejection cover, (1) the operation instruction from the operation / display panel 8 is performed. Thus, the required feed roller is rotated forward or backward, or (2) the required feed roller can be rotated forward or reverse manually.

The operation in this case is as shown in the flowchart of FIG. S21 to S23 correspond to S11 to S11 in FIG.
When the ADF causes a paper jam, the fact is displayed on the operation / display panel 8 (S2).
4). Next, the open / closed state of the paper feed cover or the paper discharge cover is detected (S25). If it is "open", (1) an operation instruction is given by the operation / display panel 8 so that the required feed roller rotates forward or backward. The feed roller is rotated in the reverse direction or (2) the required forward or reverse rotation of the required feed roller can be manually performed (S26).

Embodiment 4 As shown in FIG. 1, the ADF according to the present embodiment is provided with the computer system 10 via the external I / F 7 to the transport control unit 5 of the ADF according to the embodiment 1. Connected. When a jam occurs in such a configuration, the fact and the jam occurrence position are displayed on the display 10b via the computer 10a. Also in this case, the paper jam position (jam occurrence position) is confirmed by the transport control unit 5. When the operator inputs a desired instruction to the computer 10a through the keyboard 10c, the computer controls the transport control unit 5.
In addition, it is possible to request that the jam be eliminated by forward rotation or reverse rotation of the feed roller. The operation of this ADF is shown in FIG.
(S31 to S3)
6).

Fifth Embodiment The ADF according to the fifth embodiment, in addition to the configuration shown in FIG. 1, functions as a jam detection sensor to detect a change in load applied to a motor for driving a feed roller when a document is actually being conveyed. It is provided with a sensor for detecting (load fluctuation detection sensor). In this ADF, the flowchart of FIG.
As shown in steps S45 to S45), when the load on the motor suddenly increases during document conveyance, the conveyance control unit 5 determines that "paper jam" has occurred, and the feed roller can be rotated in the normal or reverse direction. It is configured as follows. However, the load fluctuation detection sensor does not operate when the load changes at the thickness of the paper or at the end of the paper, but responds to a sudden increase in the load such as a paper jam.

[0043]

As apparent from the above description, the following effects can be obtained according to the present invention. (1) The invention of the first aspect (first invention) When a document jam occurs near the entrance of the document conveying / discharging path, the jam is eliminated by reversing the feed roller, so that the jam is automatically eliminated. This makes it possible to save time and labor for the operator. The jam document near the entrance has a high possibility of being eliminated by the reverse rotation of the feed roller, so that the present invention is extremely useful.

(2) The invention according to claim 2 (second invention) and the invention according to claim 5 (third invention) If the ADF determines that the document can be removed without damaging the document, the operator may experience a jam. When the cover at the position is opened, the feed roller in the vicinity of the cover opening is rotated forward or backward by the drive mechanism, and the jam document is eliminated through the cover opening. This can easily be eliminated without causing damage.

(3) According to the third aspect of the present invention, since the rotation speed of the feed roller at the time of removing the jammed document is lower than the document conveying speed at the time of reading the document, jamming can be performed more safely and reliably. Manuscripts can be eliminated.

(4) Inventions of Claims 4 and 6 If the ADF determines that the forward rotation or reverse rotation of the feed roller cannot eliminate the jammed document without damaging it, the operator is notified accordingly. Therefore, there is no danger of forcibly removing the jam original by mechanical operation, and the jam original can be safely and reliably eliminated manually.

(5) The operator of the present invention is notified that the original can be removed without damaging the original by the forward or reverse rotation of the feed roller, and the operator performs a specific operation on the operation / display panel. Since the feed roller is rotated forward or backward only during the operation, the jam document can be safely and reliably eliminated.

(6) The invention according to claim 8 is notified to the operator that a jam has occurred, and the feed roller is rotated forward or backward only while the operator is performing a specific operation on the operation / display panel. It is possible to safely and reliably eliminate a jam document.

(7) The feed roller is rotated forward or backward at a speed lower than the document conveying speed at the time of reading the document by the driving mechanism only while the operator performs a specific operation on the operation / display panel. As a result, the jam original can be more safely and reliably eliminated.

(8) The tenth aspect of the invention When the opening of the ADF opening / closing cover is detected, the feed roller can be manually rotated forward and reverse manually.
The jam document can be more safely and reliably eliminated.

(9) The invention according to claim 11 When the opening of the ADF opening / closing cover is detected, the feed roller can be rotated forward or backward by the drive mechanism at a speed lower than the document conveying speed when reading the document. Therefore, the jam original can be more safely and reliably eliminated.

(10) The ADF is connected to a computer system to notify the computer of the occurrence of a jam to notify the location of the occurrence of the jam, and the computer is operated by the operator to operate the computer.
F is requested to remove the jam by forward rotation or reverse rotation of the feed roller, so that the jam document can be more easily removed.

(11) The invention of claim 13 When the load on the motor for driving the feed roller suddenly increases while the original is being conveyed, the feed roller is rotated forward or backward by this motor. With this configuration, the jam original can be easily eliminated without damaging the original.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a control system of a copying machine as an image reading apparatus provided with an ADF according to a first embodiment.

FIG. 2 is a schematic cross-sectional view showing the entire structure of an ADF provided on the copying machine shown in FIG.

FIG. 3 is a flowchart showing an operation of the ADF shown in FIG. 2;

FIG. 4 is a schematic cross-sectional view of a main part showing a modification of the ADF shown in FIG. 2;

FIG. 5 is a flowchart showing an operation of the ADF according to the second embodiment.

FIG. 6 is a flowchart showing an operation of the ADF according to the third embodiment.

FIG. 7 is a flowchart showing an operation of the ADF according to the fourth embodiment.

FIG. 8 is a flowchart showing an operation of the ADF according to the fifth embodiment.

[Explanation of symbols]

 Reference Signs List 1 control unit 2 memory 3 reading unit 4 image processing unit 5 conveyance control unit 6 sensor 7 external I / F 8 operation / display panel 10 computer system 10a computer 10b display 10c keyboard 21 copying machine 22 contact glass 30 ADF (automatic document feeder) 31) Document tray 32 Separating / feeding means 32a First feed roller 32b First feed roller 33 Loading means 33a Second feed roller 33b Second feed roller 34 Loading / unloading means 34a Endless traveling belt (transport belt) ) 34b drive roller 34c driven roller 34d pressure roller 35 paper discharge means 35a third feed roller 35b paper discharge guide roller 36 paper discharge tray 41 first jam detection sensor 42 second jam detection sensor 43 third jam detection Sensor 51 supply Cover 51a feeding the cover sensor 52 exit cover 52a exit cover sensor 61 ADF cover P document

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/00 108 G03G 21/00 372 1/04 H04N 1/12 Z F-term (Reference) 2H027 DB04 DB07 ED13 EE03 EE04 EK04 EK10 GB08 2H076 BA65 BA68 BA72 BA76 BA79 BB05 BB10 3F048 AA02 AA04 AB02 BA14 BB03 BC03 BD01 DA04 DA06 DA09 EA13 EB23 EB40 5C062 AA05 AA13 AB02 AB23 AB29 AB41 AC11 NA12 NA15 NA15 NA15 RA02 RA04 RA10 UA13 XA01

Claims (13)

[Claims] An automatic document feeder for transporting a document on a document placing table to a reading section of an image reading device by a forward / reverse feed roller, and then collecting the document on a sheet discharge tray. A jam detection sensor near the entrance of the conveyance / discharge path, which detects a jam document near the entrance and determines whether or not the document is at a position that can be eliminated by reverse rotation of the feed roller, If the jam detection sensor determines that the document can be removed, the document is removed by reversing the feed roller,
If it is determined that the elimination by the reverse rotation of the feed roller is impossible, the result of the determination is notified to an operator. 2. An automatic document feeder, which conveys a document on a document placing table toward a reading section of an image reading device by a feed roller which can be rotated forward and backward, and collects the document on a sheet discharge tray. A jam detection sensor is provided in the transport / discharge path, an openable / closable cover capable of opening a proper position in the transport / discharge path, and a cover sensor for detecting the opening of the cover. Is detected,
When the automatic document feeder determines that the original can be removed without damaging the original due to forward or reverse rotation of the feed roller near the jam occurrence position, the operator is notified of the determination result and When the operator opens the cover at the jam occurrence position, the feed roller in the vicinity of the cover opening is rotated forward or backward by the drive mechanism to remove the jammed document through the cover opening. Automatic document feeder characterized by: 3. The automatic document feeder according to claim 2, wherein the rotation speed of the feed roller when the jammed document is eliminated is lower than the document feed speed when reading the document. apparatus. 4. The automatic document feeder according to claim 1, wherein the jam detecting sensor detects a jam of the document, and the document cannot be removed without damaging the document by forward or reverse rotation of the feed roller. 3. The automatic document feeder according to claim 2, wherein when the judgment is made, the judgment result is notified to an operator. 5. A document placing table, a sheet discharge table, a transport control unit for controlling a document transport operation, and an operation of the automatic document transport device, and an operation status of the automatic document transport device and a display of operation instruction contents. Separating / feeding means, comprising: an operation / display panel for carrying the document; and a first forward / reverse freely movable feed roller for transporting the documents one by one from the bundle of documents on the document table to the reading section of the image reading apparatus. A document feeder comprising a second forward / reverse rotatable feed roller for further conveying the document from the document separation / feeder to the reading section; and further reading the document from the document feeder into the reading section. The document feeder comprises an endless running belt which is conveyed toward and stops at the document reading section, and a third forward / reverse rotatable feed roller which discharges the read document onto the paper output table. Paper discharging means and the original Provided near the separation / feeding means,
A first jam detection sensor for detecting a non-feeding jam of a document; a second jam detection sensor provided near the document carrying means for detecting a stagnant jam of the document; and a second jam detection sensor provided near the paper discharging means. A third jam detection sensor for judging a non-dischargeable jam, a paper feed cover for opening and closing the vicinity of the document separating / feeding means and the vicinity of the document carrying means, and a discharge cover for opening and closing the vicinity of the paper discharging means. A paper cover, a sensor for detecting opening and closing of the paper supply cover, and a sensor for detecting opening and closing of the paper ejection cover, and one of the first to third jam detection sensors has detected a jam. In this case, when the conveyance control unit determines that the jam original can be eliminated without damaging the original due to normal rotation or reverse rotation of the feed roller near the jam occurrence position, Is notified to the operator, and when the operator opens the paper feed cover or the discharge cover which is the cover at the jam occurrence position, the cover opening portion is opened by the forward or reverse rotation of the feed roller by the drive mechanism. An automatic document feeder, wherein a jam document is eliminated through the automatic document feeder. 6. The conveyance controller determines that the jam detection sensor detects a jam and that the jammed document cannot be removed without damaging the document by forward or reverse rotation of the feed roller. When you do
6. The automatic document feeder according to claim 5, wherein the judgment result is notified to an operator. 7. In addition to the configuration according to claim 5, when any one of the first to third jam detection sensors detects a jam, the jam original is fed near the jam occurrence position. When the transport control unit determines that the original can be removed without damaging the document by the forward or reverse rotation of the roller, the result of the determination is notified to the operator, and the operator performs a specific operation on the operation / display panel. An automatic document feeder having a configuration in which the feed roller is rotated forward or backward only during operation. 8. In addition to the configuration according to claim 5, when any one of the first to third jam detection sensors detects a jam, the operator is notified to that effect, and Regardless of the judgment,
An automatic document feeder, wherein the feed roller is rotated forward or backward only while an operator performs a specific operation on the operation / display panel. 9. The feed roller is rotated forward or backward by the driving mechanism at a speed lower than the document transport speed during document reading only while an operator performs a specific operation on the operation / display panel. The automatic document feeder according to claim 5, wherein: 10. In addition to the configuration according to claim 5, when the sensor for detecting opening / closing of the paper feed cover or the sensor for detecting opening / closing of the discharge cover detects the opening of these covers, the conveyance is performed. An automatic document feeder having a configuration in which a control unit enables manual rotation of the feed roller. 11. In addition to the configuration according to claim 5, when the sensor for detecting opening / closing of the paper feed cover or the sensor for detecting opening / closing of the paper discharge cover detects the opening of these covers, the conveyance is performed. An automatic document feeder, characterized in that a control unit enables the feed roller to rotate forward or backward by the drive mechanism at a speed lower than the document feed speed when reading the document. 12. The transfer control unit is connected to a computer system, and when the jam occurs, a jam occurrence position is notified to a computer, and an operator operates the computer so that the computer controls the transfer control unit. 6. The automatic document feeder according to claim 5, wherein a request for eliminating jams by forward rotation or reverse rotation of the feed roller is required. 13. A sensor for detecting a change in load applied to a drive motor of the feed roller when a document is currently being conveyed is provided as the jam detection sensor, and when a sudden increase in load is detected, 6. The automatic document feeder according to claim 2, wherein the driving motor rotates forward or backward.