JPH02148066A - Automatic document feeding mechanism - Google Patents

Abstract

PURPOSE:To automatically reset a document in an initial set position without taking out the document from the inside of an automatic feeding mechanism by reversely feeding the document when plural detecting means detect defective feeding of a copying paper and the document. CONSTITUTION:When the copying paper 37 generates a defective feeding on a feeding path, a jam detector 45 detects it; a copying machine 10 is stopped to remove defectively fed paper. When a document detector 23 detects the document in the subsequent operation after the removing process, a feeding roll 19 reversely rotates to return the document to the initial set position of a setting table 16, and copying is restarted by the detection of the detector 17. Since the timing of insertions of the document and the copying paper is matched by the detectors 17 and 35, defective feeding of the document is detected by the detector 23; when the document is reversely fed by the rolls 19 and 22 and returned to the initial position, reset condition is realized by the detection of the detector 17. This eliminates the need to open/close an automatic document feeder 14 and to reset the document.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic document conveyance mechanism, and in particular, the present invention relates to an automatic document conveyance mechanism, in which a document placed in an insertion slot is taken in by an automatic document conveyance means, and is automatically guided to a copying position. , which utilizes an automatic document conveyance mechanism that sends the document out of the apparatus, and relates to processing of documents when paper is conveyed incorrectly (jammed, etc.).

[Prior art]

Image forming devices include printers, facsimile machines, copying machines, and the like. The automatic document conveyance mechanism of such an image forming apparatus, for example, a copying machine, generally includes a conveyance device provided at a copying position and a document detector for detecting the timing of sending a document or the presence or absence of a document. Additionally, the drive system of the document conveyance device is usually the same as or synchronized with the drive system of the photoreceptor drum and copy paper R feeding mechanism, and the timing for feeding the document together with the copy paper is determined by a document detector. There is.

By the way, in a copying machine, when a conveyance failure such as a jam occurs while conveying copy paper, the apparatus stops, and after the jam is cleared, copying is started again.

[Problem that the invention seeks to solve]

However, in such conventional copying machines, when a jam occurs, it is not only necessary to remove the copy paper from the device, but also to remove the original from the automatic document transport mechanism and place the same original in the initial setting position again. There is a problem that must be met.

Furthermore, in order to eliminate the trouble of taking out originals from the automatic document transport mechanism, a system has been proposed in which the original is automatically ejected from the automatic document transport mechanism even if a jam or the like occurs (Japanese Patent Application Laid-open No. 1983-1989-1). Publication No. 156966, JP-A-59-
106099). However, even with a copying machine having such a configuration, there is a problem in that the same document must be reset to the initial setting position again.

Furthermore, resetting documents like this is not limited to copy paper;
A similar problem occurs when a document jams or the like occurs.

The present invention has been made in view of the above circumstances, and it provides an image that allows the same original to be automatically set in the initial setting position after a jam or the like occurs, without having to take out the original from the automatic document transport mechanism. The object of the present invention is to provide an automatic document transport mechanism for a forming apparatus.

Another object of the present invention is to provide an automatic document conveyance mechanism for an image forming apparatus that can automatically reset the document to the initial setting position even if a conveyance failure occurs in the document. There is.

[Failure to solve the problem]

In order to achieve the above object, the present invention provides an automatic document feeding mechanism that takes in an original set in an insertion slot by an automatic document transport means, automatically guides it to a copying position, and sends it out of the apparatus after copying. The automatic document conveyance mechanism includes a first document detection device disposed at an initial document setting position, a second document detection device that detects the presence or absence of a document from a document insertion port to a document ejection port including a copying position. Placed on the copy paper conveyance path,
A conveyance defect detection means for detecting a conveyance defect of copy paper, and conveys the document from the document insertion slot to the document ejection port;
and a conveyance means capable of conveying the document in reverse, and the conveyance means reversely conveys the document when the second document detection means detects the document and the conveyance failure detection means detects a conveyance failure of the copy paper. The apparatus is characterized in that when the first document detecting means detects the document at the initial set position, reverse conveyance is stopped, and the document is conveyed again after defective conveyance of the copy paper is removed. .

Further, the invention of the cylinder 2 of the present invention is characterized in that the timing at which the document is discharged from the document transport means and the timing at which the copy sheet is discharged are substantially the same.

Furthermore, the invention of the cylinder 3 is such that the second document detecting means detects a failure in conveyance of the document, and the document conveyance means is controlled to reversely convey the document based on the detection of the failure in conveyance. It is characterized by

[Effect]

According to the automatic document transport mechanism according to the present invention, a document is placed on a paper feed tray or the like and set at the initial document setting position. Then, based on the first document detection means, the document is conveyed from the insertion slot to the copying position by the document conveying means in synchronization with the insertion timing of the copy paper. The document is temporarily stopped at the copying position, and after being copied, is sent out from the discharge port by the document conveying means.

Further, the second document detection means detects the movement of the document from the insertion port to the discharge port, and detects whether the document has been accurately copied.

When copying a document with such a configuration, if a copy paper causes a conveyance failure on its conveyance path, the first general conveyance failure is detected by the conveyance failure detection means.

Based on this detection, the copying machine is temporarily stopped.
A process for removing defective items is performed. After the processing, the copying machine is restarted and when the second document detecting means detects the document within the document conveying means, the drive section of the document conveying means is reversed to reversely convey the document.

Although the reverse transport operation of the document transport means was performed after the copying machine was temporarily stopped, in this case, if a transport failure is detected, the reverse transport operation of the document transport means may be performed immediately before stopping the copy machine.

The reverse conveyance of the document returns the document to the initial setting position, and when the first document detection means detects the document, the reverse conveyance is stopped and copying of the document is resumed.

In this way, even if a copy sheet is conveyed incorrectly (jammed), the original is automatically reset.

Further, by making the timing at which the document is ejected from the document transport means substantially the same as the timing at which the copy sheet is ejected, the document can be reliably returned by the transport means in the event that a copy paper is conveyed incorrectly (jammed). That is, when the original is in the original transporting means, a failure in transporting the copy sheet occurs.

Furthermore, even though the first document detection means has synchronized the insertion timing of the document with the copy paper, if the document is not conveyed properly (jammed) due to the influence of the document conveyance means, etc., the third invention of the present application A second document detection means detects a document conveyance failure.

Then, based on the detection of the conveyance failure by the second document detection means, the document conveyance means reversely conveys the document.

The original is returned to the initial set position by the original pick-up and reverse transport, and when the first original detection means detects the original, the reverse transport is stopped and copying of the original is resumed.

[Preferred embodiments of the invention]

Preferred embodiments of the automatic document transport mechanism according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows automatic document transport i11 according to the present invention. FIG. 2 is an explanatory diagram of a copying machine provided with To briefly explain the copying machine 10 shown in FIG. 1, the top surface of the copying machine 10 has a document insertion section 1
2 and an automatic document feeder 14 are installed. Manuscript 15
is the document set table 16 formed on the right side of the copy a10.
The document is placed on the original document feeder 14 through the insertion opening 18 and conveyed by the conveyance rollers 9 and 19 into the automatic document feeder 14.

A first document detector 17 is installed near the insertion slot 18, and the first document detector 17 is mutually related to a paper detector 35 of a paper feed port 38 for a copy paper 37, which will be described later. , the insertion timing of the original 15 and the insertion timing of the copy paper 37 are matched.

Further, a second document detector 2 is installed in the automatic document feeder 14.
3.23 is provided to detect the movement of the document 15 within the device 14. The second document detector 23 controls the conveyance rollers 19 and 19 and feed rollers 22 and 22, which are conveyance means of the automatic document feeder 14, based on the detection of the document 15. For this reason, the document 15 is accurately once stopped at the copy Ci position 2o of the copying machine by the second document detector 23, and then sent out by the feed rollers 22,22. The sent original 15 is sent out to the hemispherical cover 24, and the receiver is loaded on the tray 26.

Further, the conveyance roller 19 and the feed roller 22 can not only be rotated forward in the conveyance direction but also reversely rotated. These reverse rotation drives are also performed by the second document detector 23.
This is done based on the detection of

When the second document detector 23 sends a control signal for reverse rotation operation to the transport roller 19 and the feed roller 22, the copying machine 10 stops due to a jam of copy paper, etc., and then the copying machine 1
0 is activated and the second document detector 23 detects the document 15. Further, the second document detector 23 detects the document 15.
Even when it is detected that the conveyance timing is incorrect (when a document is jammed), a control signal for reverse rotation operation is sent to the conveyance roller 19 and the feed roller 22.

An exposure section 28 having an optical system is formed below the copying position 20, and a drum 30 having an amorphous silicon photoconductor layer on its surface is provided below the exposure section 2B.
0 forms a 41) mold part.

Around the drum 30 is a developing section 32 that feeds toner etc.
, a transfer section 34 that transfers an image onto copy paper, and a static elimination/cleaning section 36 are provided.

On the other hand, the copy paper 37 is placed in the drawer at the bottom of the copier 10.
The timing roller 39 and the above-mentioned paper detector 35 are arranged at the paper feed port 38. The copy sheet 37 is timed to be inserted with the original 15, and is sent to the transfer section 34 through registration rollers 40, 40 and a guide path 42. After the image is transferred to the copy paper in the transfer section 34, it is sent to the fixing section 44, where the image is fixed by heating or pressure.

Furthermore, jam detectors 45, 45, . . . are provided at a plurality of positions on the conveyance path of such copy paper 370. The jam detector 45 detects poor conveyance of copy paper and stops the copying machine 10. The jam detector 45 detects the copy paper 37
It may be detected by sliding contact with the roller, but it may also be detected by changes in the load on the nip roller or the like. Alternatively, a paper jam detector or the like may be used.

Incidentally, the copy paper 37 is delivered to a nip l-column 46, 46 and sent to a curved I-lay 48.

According to the automatic document 1 general feeding mechanism according to the present invention configured as described above, the document 15 is placed on the document setting table IG, and the document 15 is set at the initial setting position.

The original 15 is inserted from the insertion slot 18 based on the first original detector 17 in synchronization with the insertion timing of the copy paper 35 . The original 15 in the automatic original feeder 14 is sent to the copying position 20 by transport rollers 19,19. Manuscript 15
stops at the copying position 20, and after copying, the feed roller 22
．． 22, the document is sent out of the automatic document feeder 14.

During such copying, if the copy paper 35 has a conveyance failure on its conveyance path, the jam detector 4 detects the conveyance failure.
Detected by 5. And based on this detection,
The copying machine 10 is temporarily stopped, and a process for removing transport defects is performed. After processing, if the copying machine] 0 is restarted and the second document detector 23 is detecting the document 15, a control signal is sent from the second document detector 23 to the conveying rollers 19 and 19 to reverse operation. will be sent. As a result, the conveyor roller 19.19
is reversed, and the original 15 is conveyed in the reverse direction.

Due to the reverse conveyance of the original 15, the original 15 is transferred from the original sensor 1 to the table 1.
It is returned to the initial set position of 6. Then, when the first document detector 17 detects the document 15, the reverse conveyance is stopped and copying of the document 15 is started again.

In this way, even if a conveyance failure (jam) occurs in the copy paper 35, the original 15 will be automatically reset. Therefore, it is not necessary to open and close the automatic document feeder 14 to take out the document 15 and to set the document 15 again.

In addition, in the embodiment described above, the feed roller 19, feed 1:I-
- The reverse conveyance operation of the original 15 by the roller 22 was performed after the copying machine 10 was once stopped. However, in this case, even if a conveyance failure is detected, reverse conveyance may be immediately performed to the place where copying i10 is stopped. Therefore, the conveyance roller 1 of the automatic document feeder 14
9 and the feed roller 22, indirectly or directly, when the detector 45 detects a conveyance failure of the copy paper 35 and the second document detector 23 detects the document 15. be reversed.

Furthermore, if the timing for discharging the original 15 from the automatic document feeder 14 and the timing for discharging the copy paper 35 are approximately the same, if a conveyance failure (jam) occurs in the copy paper 35, the original 15 will be transferred to the automatic document feeder 14. It will definitely be returned. This is because when the original 15 is in the automatic original feeder 14, the copy paper 35 may be conveyed incorrectly.

Furthermore, a copy of the application! In the configuration of 10, even when the original 15 causes a conveyance failure, the original 15 can be automatically reset.

That is, even though the insertion timing of the original 15 is matched with the copy paper 35 by the first original detector 17, if the transport speed of the transport roller 19 or the like in the automatic original feeder 14 is disturbed, the transport of the original 15 is It becomes defective. 15 such manuscripts
If a conveyance failure (JA・MU) occurs in the document 15, the second document detector 23 detects the conveyance failure of the document 15. Then, based on the detection of the conveyance failure from the second document detector 23, the conveyance roller 19 and the feed roller 22 reversely convey the document. By the reverse conveyance of the original 15, the original 15 is returned to the initial position 1, and the first original detector 17 detects the original 15 and stops the reverse one-fold feeding such as one-fold feeding l cola 19.

〔Effect of the invention〕

As described above, according to the automatic document transport mechanism according to the present invention, the copying machine is provided with a document transport means that can transport the document in the reverse direction. Then, when a defect in the conveyance of the copy paper is detected and the document is detected by the second document detection means in the respective urine feeding means, the document conveyance means is operated in reverse, so that a defect in the conveyance of the copy paper, etc. occurs. After that, the same original can be automatically set at the initial setting position without having to take out the original from the automatic original transport mechanism.

Further, in the present invention, the second document detecting means detects a document conveyance failure and causes the document conveyance means to perform reverse conveyance operation. can be automatically reset to the initial set position.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a copying machine equipped with an automatic document conveyance mechanism 3 according to the present invention. 10- copying machine, 14-.- automatic document feeder,
15- Original, 17- First original detector,
18-insertion port, 19-transport roller, 20-copying position, 22-feeding roller, 23-second document detector, 35-paper detector, 3'l-copy paper, 3B---1 paper feed Mouth, /15- Jam detector.

Claims (3)

[Claims] (1) The automatic document transport mechanism takes in the original set in the insertion slot, automatically guides it to the copying position, and sends it out of the device after copying. a second document detecting means for detecting the presence or absence of a document from the document insertion port to the document ejection port including the copying position; The second document detecting means is composed of a conveyance defect detection means for detecting a defective conveyance, and a conveyance means capable of conveying the document from the document insertion port to the document ejection port and also capable of reversely conveying the document. When the document is detected and the conveyance failure detection means detects a conveyance failure of the copy paper, the document is conveyed in the reverse direction, and when the first document detection means detects the document at the initial set position, the reverse conveyance is stopped and the copy paper is conveyed in the reverse direction. An automatic document conveyance mechanism characterized in that the automatic document conveyance mechanism is controlled to carry out conveyance again after the conveyance defect is removed. (2) The automatic document conveyance mechanism according to claim 1, wherein the timing at which the document is discharged from the document conveyance means and the timing at which the copy sheet is discharged are substantially the same. (3) The second document detecting means detects a failure in conveyance of the document, and the document conveyance means is controlled to carry out reverse conveyance of the document based on the detection of the conveyance failure. The automatic document conveyance mechanism described in paragraph 1.