JP2000209403A - Image reading device - Google Patents

Abstract

(57) [Problem] To provide an image reading apparatus capable of accurately reading document image information even when a distance between conveyed documents becomes narrow. A new document to be read is provided if the leading edge of the document next to the document to be read passes through the predetermined reading reference position before the trailing edge of the document to be read is conveyed to a predetermined stamping position. As for the next original, the conveyance of the next original after the leading end of the next original passes through the predetermined reading reference position and until the rear end of the original to be read is conveyed to the predetermined stamping position. Reading is started after the distance is conveyed by a distance reduced from a predetermined distance from the reading reference position to the scan line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and more particularly, to an image reading apparatus which separates and feeds a plurality of set originals.
The present invention relates to an image reading apparatus that sequentially reads and reads pages one by one.

[0002]

2. Description of the Related Art In an apparatus including an image reading apparatus as a configuration of a scanner apparatus, a copying machine, a facsimile apparatus, and the like,
An automatic document feeder (A
DF) in many cases.

In order to improve the document reading speed, it is necessary to minimize the interval between documents that are separately fed and conveyed.

[0004]

However, if the interval between the documents conveyed for high-speed reading of the document becomes too narrow, the reading start position control for accurately reading the document of each page and the shading correction data are not performed. There is a problem that the reading process cannot be performed normally.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image reading apparatus capable of accurately reading original image information even when the interval between the conveyed originals becomes narrow. I do.

[0006]

According to another aspect of the present invention, there is provided an image reading apparatus which separates and feeds a plurality of set originals and sequentially conveys the originals one by one to read. When it is detected that the leading end of the original has passed a predetermined reading reference position, the reading is started by further conveying the reading reference position from the reading reference position by a predetermined distance to the scanning line. The reading operation of transporting to the stamp stamping position is repeatedly performed with the next document of the document to be read as a new document to be read,
In an image reading apparatus that sequentially obtains image information about each of the plurality of set documents, a reading reference position detecting unit that detects whether a leading end of the document has passed the predetermined reading reference position, A stamped position detecting means for detecting whether or not the trailing edge of the document to be read has been transported to the predetermined stamping position; and the stamping position detecting means has been configured such that the trailing edge of the document to be scanned is transported to a predetermined stamping position. If it is detected by the reading reference position detecting means that the leading end of the next document after the reading target document has passed the predetermined reading reference position before detecting that As for the next original, after the leading end of the next original has passed the predetermined reading reference position, the stamping position detecting means sets the trailing end of the original to be read. Reading start position assurance means for starting reading after conveying the conveyance distance until detecting that the sheet has been conveyed to the predetermined stamping position from the predetermined distance from the reading reference position to the scan line. It is characterized by having.

According to a second aspect of the present invention, the image reading apparatus separates and feeds a plurality of set originals and sequentially conveys one page at a time while detecting that the leading end of the original to be read has passed a predetermined reading reference position. Upon detection, the reading is started by further transporting a predetermined distance from the reading reference position to the scan line,
When reading to the rear end of the original to be read, the reading operation of transporting the rear end to a predetermined stamping position is repeated by setting the next original of the original to be read as a new original to be read. A reading reference position detecting means for detecting whether the leading edge of the document has passed the predetermined reading reference position; and A stamped position detecting means for detecting whether or not the document has been conveyed to the stamped position, and a limit position detection for detecting whether or not the document has reached a predetermined limit position in front of the scan line beyond the predetermined reading reference position. The stamp reading position detecting means detects that the rear end of the document to be read has been conveyed to a predetermined stamping position. When the reading reference position detecting means detects that the leading edge of the next document of the elephant document has passed the predetermined reading reference position, the leading edge of the next document passes through the predetermined reading reference position. After that, until the stamped position detecting means detects that the rear end of the document to be read has been conveyed to the predetermined stamped position, the limit position detecting means detects the next document of the document to be read. When it is not detected that the leading edge has reached the predetermined limit position, for the next document as a new document to be read, the leading edge of the next document passes through the predetermined reading reference position. Then, the conveying distance until the stamping position detecting means detects that the rear end of the document to be read has been conveyed to the predetermined stamping position is defined as a scan distance from the reading reference position. While reading is started after transporting by a distance reduced from a predetermined distance to the line, after the leading edge of the next document has passed the predetermined reading reference position, the stamping position detecting means detects the document to be read. Until the trailing edge is detected to be conveyed to the predetermined stamping position, the leading edge of the next document after the document to be read has reached the predetermined limit position by the limit position detecting means. When detected,
The transport operation of the document to be read to the predetermined stamping position is not performed, and the next document as a new document to be read is transported by a distance corresponding to the scan line from the predetermined limit position. And a reading start position assurance means for starting reading after the reading.

According to a third aspect of the present invention, in the image reading apparatus according to the second aspect, after the leading end of the next document has passed the predetermined reading reference position, the stamp imprint position detecting means. Until the trailing edge of the document to be read is conveyed to the predetermined stamping position, the leading edge of the document next to the document to be read reaches the predetermined limit position by the limit position detecting means. When the error is detected, a means for outputting and / or retaining a history indicating that the stamping position is shifted is further provided.

According to a fourth aspect of the present invention, there is provided an image reading apparatus which separates and feeds a plurality of set originals and sequentially conveys one page at a time while detecting that the leading end of the original to be read has passed a predetermined reading reference position. Upon detection, the reading is started by further transporting a predetermined distance from the reading reference position to the scan line,
When reading to the rear end of the original to be read, the reading operation of transporting the rear end to a predetermined stamping position is repeated by setting the next original of the original to be read as a new original to be read. A reading reference position detecting means for detecting whether the leading edge of the document has passed the predetermined reading reference position; and A stamped position detecting means for detecting whether or not the document has been conveyed to the stamped position, and a limit position detection for detecting whether or not the document has reached a predetermined limit position in front of the scan line beyond the predetermined reading reference position. The stamp reading position detecting means detects that the rear end of the document to be read has been conveyed to a predetermined stamping position. When the reading reference position detecting means detects that the leading edge of the next document of the elephant document has passed the predetermined reading reference position, the leading edge of the next document passes through the predetermined reading reference position. Later, before the reading up to the trailing edge of the document to be read is completed, when the limit position detecting means does not detect that the leading edge of the document next to the document to be read has reached the predetermined limit position. In the case of the next document as a new document to be read, a period from when the leading edge of the next document passes the predetermined reading reference position to when reading to the rear end of the document to be read is completed. While reading is started after transporting the transport distance by a distance reduced from a predetermined distance from the reading reference position to the scan line, the leading edge of the next document passes through the predetermined reading reference position. When the limit position detecting means detects that the leading end of the next document after the reading target document has reached the predetermined limit position before the reading up to the rear end of the reading target document is completed. Without reading the shading correction data for the next original, the shading correction data for the next original is used as the shading correction data for the original to be read, and for the next original as the new original to be read, A reading start position assurance means for starting reading after transporting by a distance corresponding to the scan line from the predetermined limit position.

According to a fifth aspect of the present invention, in the image reading apparatus according to the fourth aspect, after the leading end of the next original has passed through the predetermined reading reference position, the image reading apparatus has an image reading apparatus which is located after the leading end of the original to be read. If the limit position detecting means detects that the leading end of the next document to be read has reached the predetermined limit position before the reading up to the end is completed, the reading of the shading correction data is performed. It is characterized by further comprising means for outputting and / or retaining the history of the failure.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

First, FIG. 1 shows a block configuration of a facsimile apparatus 1 as an image reading apparatus according to an embodiment of the present invention. In the embodiments described below, a case will be described in which the present invention is applied to a facsimile apparatus. However, the present invention is not limited by the use form of image information obtained by reading an original, and is not limited to a scanner. Needless to say, the present invention can be similarly applied to other devices including an image reading device such as a device or a copying machine as a configuration.

In FIG. 1, a facsimile apparatus 1 includes a scanner 2, a plotter 3, an operation display unit 4, an image memory 5,
Parameter memory 6, clock circuit 7, PC-I / F 8, character generator 9, RAM 10, ROM 11, C
It comprises a PU 12, an encoding / decoding unit 13, a communication control unit 14, a modem 15, a network control unit 16, and a system bus 17.

The scanner 2 has 3.85 lines / mm, 7.7
This is for obtaining image information by reading a document image at a predetermined reading line density such as book / mm and 15.4 book / mm. The plotter 3 is for recording and outputting the received image information according to its linear density, and for recording and outputting (copying) the image information read by the scanner 2 according to its linear density.

The operation display unit 4 is provided with a numeric keypad for designating a destination facsimile number, a transmission start key, a one-touch dial key, and other various keys, and includes a display such as a liquid crystal display device. It displays the operating state of the device to be notified to the user and various messages. The image memory 5 temporarily stores image information read by the scanner 2 or image information transferred from the personal computer 30 via the PC-I / F 8 as a file for memory transmission, or stores received image information. , Until they are recorded by the plotter 3 or transferred to the personal computer 30. The parameter memory 6 is backed up by a backup circuit (not shown) and stores user parameters such as system setting status and one-touch dial registration contents. The stored contents are retained even when the apparatus is powered off. The clock circuit 7 measures the current date and time,
This is for performing a timer operation.

The PC-I / F 8 is an interface paired with an interface (not shown) on the personal computer (PC) 30 side. The PC-I / F 8 serves as an interface for performing local communication between the facsimile machine 1 and the personal computer 30. It becomes. The personal computer 30 controls the PC-I /
Via F8, it requests the facsimile machine 1 to transmit image information, requests the facsimile apparatus 1 to record and output image information, and receives received image information from the facsimile apparatus 1 and image information read by the scanner 2. By receiving the transfer, the facsimile machine 1 is used.

The character generator 9 stores a font table in which font data is associated with character codes such as alphabets, numbers, kana characters, symbols, and kanji characters. The CPU 12 converts a character string into image information. Refer to the character generator 9. RAM1
0 is a random access memory used as a work area of the CPU 12. The ROM 11 is a read-only memory in which a control program for the CPU 12 to control each unit of the apparatus is stored. The CPU 12 has a ROM 1
2 according to the control program written in the RAM 10.
Is used as a work area to control each unit of the apparatus.

The encoding / decoding section 13 converts the transmission image data into an MH encoding system conforming to G3 facsimile,
A predetermined decoding method corresponding to the MH coding method, the MR coding method, the MMR coding method, and the like, while receiving and compressing the image data by a predetermined coding method such as the R coding method and the MMR coding method. Is used for decoding and decompression. The communication control unit 14 controls the modem 15 and the network control unit 16 to
This is for controlling facsimile communication. The modem 15 modulates data transmitted to the line via the network control unit 16 and demodulates a communication signal received from the line via the network control unit 16. Also, the modem 15
It also sends out a DTMF signal corresponding to the dialed number. The network control unit 16 is connected to the line, and under the control of the communication control unit 14, closes / releases the DC loop of the line, detects the polarity reversal of the line, detects the release of the line, detects the dial tone, busy tone, etc. The control of connection with a line, such as detection of a tone signal and detection of a call signal, and generation of a dial pulse are performed. The system bus 17 is a signal line through which the above components exchange data.

Next, the configuration of the scanner 2 will be described with reference to FIG.

In FIG. 1, the scanner 2 includes an ADF for securing a space between pages by a linear velocity difference between a feed roller Rf and a pair of reading rollers R0 and R1, and includes a feed roller Rf and a pair of reading rollers R0 and R1.
Means that the linear velocity is set in advance, and the feed roller Rf is set to have a lower linear velocity than the reading roller pair R0, R1. In this state, the first page of the plurality of stacked originals P is
p, and is fed to the reading roller pair R0 by the feed roller Rf, and the next original is fed by the pickup roller Kp from the time when the rear end of the original of the first page has passed the reverse roller (separation unit) Rr. Although the document is to be sent to the reading roller pair R0 by Rf, a gap is generated between the document of the previous page and the document of the next page due to the linear velocity difference. Nowadays, high-speed reading is required,
It is designed to minimize the interval between the pages and improve the speed at the time of multi-page reading.

In FIG. 2, the original width sensor S0
Is a sensor for detecting the width (A4, B5, B4, etc.) of the set document. The document sensor S1 detects that the document P has been set. The reference position sensor S2 is a sensor for determining the position of the leading edge of the document.
Is detected. Normally, a step motor is used for document conveyance, and document position control is performed by managing the number of steps.

Documents that are sequentially fed and separated and conveyed at intervals of one page are sub-scanned on a scan line Ls as a document to be read. The scanner 2 obtains image information by reading from the leading end to the trailing end of the document to be read passing on the scan line Ls in units of main scanning lines. The lamp La is a light source for illuminating the document to be read. White reference plate W
Is for reading shading correction data for performing so-called shading correction processing for comprehensively correcting unevenness in sensitivity of an image sensor and unevenness in illumination of a lamp La before starting reading of a document to be read. Data reading is basically performed each time prior to reading of a document to be read on each page. The document to be read that has passed the scan line Ls is further conveyed by the roller R2, and if the read stamp function is enabled by setting, a mark indicating that the document has been read is pressed by the stamp St, and the discharge roller pair R3
And further discharged outside the apparatus.

Next, the basic operation of the document conveyance control will be described. The ADF document transport control is roughly divided into three types of operations: ADF pre-feed operation, reading operation, and paper discharge operation.

The ADF pre-feed operation is an operation mode in which an original set on an ADF original plate is transported to a position just before a reading line.
After the leading edge of the document arrives, the document is continuously conveyed by a predetermined amount, and the leading edge of the document is stopped at a reading standby position before the reading line. The ADF pre-feed operation is executed not only for the first page but also for each page. However, if the document is already at the position where the reference position sensor S2 is ON at the start of the ADF pre-feed operation, A
No DF pre-feed operation is performed.

The reading operation is an operation of reading image data while conveying the original conveyed in the ADF pre-feed operation at a speed according to the linear density designated by the user. When the document has been conveyed by a preset length, image reading is started and the document is read for a predetermined length, or after the reference position sensor S2 is turned off, a preset value corresponding to the size of the document to be read is set. After reading the length, the sheet is further conveyed for a preset length and stopped.
This stop position is a stamping standby position. Therefore, the operation of transporting to the stamping position is also included in the reading operation control.

In the paper discharging operation, the motor is rotated in the forward direction by a predetermined pulse, and the last page of the document is forcibly discharged. The scanned document is naturally discharged by the ADF pre-feed operation or reading operation during multi-page reading. Therefore, this discharging operation is not performed during multi-page reading, but only when the last page is discharged. Let it.

Next, a reading process procedure in the facsimile machine 1 will be described with reference to FIGS.

In these figures, the facsimile machine 1
Monitors whether an original is set on the scanner 2 and the original sensor S1 is turned on (No in the judgment 101).
loop). When the document sensor S1 is turned on (Yes in decision 101), it is monitored whether a [Start] key (not shown) of the operation display unit 4 for instructing the start of reading is pressed (No loop in decision 102). When the [Start] key is pressed, the above-described ADF pre-feed operation is performed until the reference position sensor S2 is turned on (Step 103,
No loop of the judgment 104).

When the reference position sensor S2 is turned on, that is, when the leading end of the document to be read reaches the position of the reference position sensor S2 (Yes in decision 104), the counter n is initialized to 0 (step 105), and the document is read. The operation of incrementing the counter n by feeding one pulse is performed by the counter n.
Until the value reaches the value A (Steps 106 and 10
7, No loop of judgment 108). Here, the value A is determined from the position of the reference position sensor S2 to the scan line L as shown in FIGS. 10 to 13 showing the positional relationship between the document of the previous page and the document of the next page in the scanner unit.
It means the distance in terms of the number of transport pulses to the reading standby position before s.

When the counter n reaches the value A, ie,
When the leading edge of the document to be read reaches the reading standby position (Yes in determination 108), the lamp La is turned on to perform shading correction data reading for reading the white reference plate W (process 109). The shading correction data thus obtained is used for shading correction when reading a document to be read from now on.

After the process 109, the counter n is initialized to 0 (process 110), and the operation of feeding the original by one pulse and incrementing the counter n is repeated until the counter n reaches the value B (process 111, process 111). Process 1112,
No loop of decision 113). Here, the value B means a distance in terms of the number of transport pulses from the reading standby position to the scan line Ls, as shown in FIGS.

When the counter n reaches the value B, that is,
When the leading end of the document to be read reaches the position of the scan line Ls (Yes in decision 113), the above-described reading operation is performed until the reference position sensor S2 is turned off, that is, the rear end of the document to be read is positioned at the position of the reference position sensor S2. (Step 114, No loop of the judgment 115).

Then, the counter m is initialized to 0 (step 116), and after the counter n is initialized to 0 (step 117), the reference position sensor S2 is turned on, that is, after the original to be read. During the reading of the edge, while monitoring whether the leading edge of the next document has reached the position of the reference position sensor S2 (No in decision 118), the document is conveyed by one pulse, the document to be read is read, and the counter n is incremented. Is repeated until the counter n reaches the value C (Process 1
21, a process 122, a process 123, and a No loop of the determination 124). Here, as shown in FIGS. 10 to 13, the value C is calculated from the position of the reference position sensor S2 to the scan line L.
It means the distance up to s in terms of the number of transport pulses.

When the determination 124 becomes Yes, the rear end of the original to be read reaches the scan line Ls, and the reading of the image information from the front end to the rear end of the original to be read is completed.

When the determination 124 is Yes, the counter n is initialized to 0 (step 125), and the reference position sensor S2 is turned on, that is, the rear end of the document to be read is set as shown in FIGS. While monitoring whether or not the leading edge of the next document has reached the position of the reference position sensor S2 before the document is transported to the indicated stamp standby position (No in decision 126), the document is transported by one pulse and the counter n is incremented. The incrementing operation is repeated until the counter n reaches the value D (steps 129, 130, and No loop of decision 131). Here, the value D means a distance in terms of the number of transport pulses from the scan line Ls to the stamp standby position, as shown in FIGS.

When the determination 131 becomes Yes, the rear end of the original to be read reaches the stamp standby position and the stamp S
At t, a mark indicating that reading has been completed is stamped (process 1).
32).

Then, it is determined whether or not there is a document of the next page (decision 133). If there is no next page (decision 1)
No. 33), the above-described sheet discharging operation is performed (process 134),
The last page of the original is forcibly ejected out of the apparatus.

If there is a document of the next page (decision 13)
3), it is determined whether or not the value of the counter m is 0 (determination 135). If the value of the counter m is 0, that is, if both the determinations 126 and 118 do not become Yes, In other words, when the reference position sensor S2 is not turned on during the reading of the rear end of the original to be read or while the original to be read is being conveyed to the stamp standby position, that is, the original to be read and the next original Is sufficient, and as shown in FIG.
When the trailing edge of the document Pn has reached the stamp standby position and the leading edge of the document Pn of the next page has not yet reached the position of the reference position sensor S2 (No in step 135), the process returns to step 103 and returns to step 103. The process from the ADF pre-feed operation is repeated with the document Pn as a new document to be read.

If the value of the counter m is not 0 in the judgment 135, that is, if the judgment 126 is “Yes” and the judgment 128 is No, or if the judgment 118 is “Y”,
If the answer is es and the determination 120 is No, in other words, during the reading of the trailing end of the document to be read, or while the document to be read is being conveyed to the stamp standby position, Although the interval is insufficient and the reference position sensor S2 is turned on, the original to be read and the next original are so long that the leading end of the original following the original to be read reaches the non-shading range shown in FIGS. Is not narrow (Yes in decision 135), the white reference plate W is not obstructed by the document to be read or the next document, and the shading correction data can be read correctly. The shading correction data for the document following the target document is read (process 136).

Then, the counter n is initialized to 0 (step 137), and the original is fed by one pulse, and
Is incremented by a counter n whose value is (C-m).
Is repeated (Steps 138, 139, No loop of judgment 140). Here, the value (C−m) is the value shown in FIG.
As shown in FIG. 1, when the rear end of the original Pp to be read on the previous page reaches the stamp standby position, the original Pn on the next page is read.
The distance (m) in terms of the number of transport pulses further transported from the position of the reference position sensor S2 by the tip of
Means the distance subtracted from the distance in terms of the number of transport pulses between the position of the scan line Ls and the scan line Ls.

When the determination 131 becomes Yes, since the leading end of the next page of the document Pn has reached the scan line Ls, the reading operation of the process 114 is performed with the next page of the document Pn as a new document to be read. When the trailing edge of the original Pp to be read of the previous page reaches the stamp standby position as shown in FIG.
Even if the leading end of the document Pn is conveyed beyond the position of the reference position sensor S2, the original Pn of the next page can be correctly read from the top.

When the reference position sensor S2 is turned on in the judgment 126, that is, until the rear end of the original to be read is conveyed to the stamp standby position shown in FIGS. The tip is the reference position sensor S
If the position of the counter m has been reached, the counter m is incremented (step 127), and whether the value of the counter m has reached E, that is, while the document to be read is being conveyed to the stamp standby position, The reference position sensor S2 is turned on because the distance between the original and the next original is insufficient, and further, whether the leading end of the next original of the original to be read has reached the shading impossible range shown in FIGS. Is determined (decision 128). If the shading is not yet reached (No in decision 128), the process proceeds to step 129, and if the shading is not reached (Yes in decision 128), If the conveyance is continued as it is, the leading end of the next document Pn enters the non-shading range and interrupts the white reference plate W.
Since the shading correction for the next document Pn cannot be performed, the process proceeds to the process 141, and a mark indicating that the document has been read is stamped on the rear end of the document to be read by the stamp St (process 141).

However, since the stamping of the stamp in the process 141 is performed before the determination 131 becomes Yes, the stamping is performed at a position shifted from the normal stamping position when the rear end of the document to be read is at the stamp standby position. . Therefore, the fact that the stamp position has shifted is displayed on the operation display unit 4, and the occurrence of the stamp position shift is stored as a history in the parameter memory 6 (process 142). This allows
In the continuous reading of a plurality of pages by the scanner 2, the user can be made aware that the document interval is becoming narrower due to the contamination of the transport system or the like.

If the determination 128 is Yes, the conveyance is stopped so that the leading end of the next document Pn does not enter the shading impossible range, and the shading correction data can be read correctly. The shading correction data for the document Pn is read (process 143).

Then, the counter n is initialized to 0 (step 144), and the original is fed by one pulse, and
Counter n is incremented by a value of (CE)
Is repeated (Step 145, Step 146, No loop of judgment 147). Here, the value (CE) is shown in FIG.
As shown in FIG. 2, when the leading edge of the document Pn of the next page reaches the non-shading range, the document Pn of the next page
Means the distance in terms of the number of transport pulses between the end of the scan line Ls and the scan line Ls.

When the determination in step 147 is Yes, the leading edge of the next page of the document Pn has reached the scan line Ls. Therefore, the reading operation of the process 114 is performed with the next page of the document Pn as a new document to be read. When the leading edge of the next page of the document Pn reaches the non-shading range as shown in FIG.
Is being conveyed to the stamp standby position, the original Pn of the next page can be correctly read from the top.

When the reference position sensor S2 is turned on in the judgment 118, that is, while the rear end of the original to be read is being read, the leading end of the next original is detected by the reference position sensor S2.
When the position of the document to be read has been reached, the counter m is incremented (step 119), and whether the value of the counter m has reached E, that is, while reading the rear end of the document to be read, It is determined whether the reference position sensor S2 is turned on because the interval between the next original and the original is insufficient, and whether the leading end of the original following the original to be read has reached the non-shading range shown in FIGS. Judgment (Judgment 1
20) If the shading is not yet reached (No in decision 120), the process proceeds to step 121, and if the shading is not reached (Yes in decision 120), the document to be read is temporarily kept as it is. If the reading or conveyance of the document is continued, the next document Pn cannot be correctly read from the leading edge, so the process proceeds to step 148, where a stamp indicating that reading has been completed is stamped on the trailing edge of the document to be read with the stamp St (step 148). .

However, since the stamping of the stamp in the process 148 is performed before the determination 131 becomes Yes, the stamping is performed at a position shifted from the normal stamping position when the rear end of the document to be read is at the stamp standby position. . Therefore, the fact that the stamp position has shifted is displayed on the operation display unit 4, and the occurrence of the stamp position shift is stored in the parameter memory 6 as a history (process 149). This allows
In the continuous reading of a plurality of pages by the scanner 2, the user can be made aware that the document interval is becoming narrower due to the contamination of the transport system or the like.

When the determination 120 becomes Yes, although the conveyance is stopped so that the leading end of the next document Pn does not enter the shading impossible range, the document Pp to be read is within the shading impossible range. Therefore, it is impossible to correctly read the shading correction data. Therefore, the shading correction data for the previous page Pp is used as shading correction data for the next original Pn (process 150).

Then, the fact that shading correction data cannot be read is displayed on the operation display unit 4, and the occurrence of shading correction data reading failure has been stored as a history in the parameter memory 6 (process 151).
This allows the user to recognize that the document interval is becoming narrower due to contamination of the transport system or the like in continuous reading of a plurality of pages by the scanner 2.

Then, the counter n is initialized to 0 (step 152), and the original is fed by one pulse.
Counter n is incremented by a value of (CE)
Is repeated (Step 153, Step 154, No loop of judgment 155). Here, the value (CE) is shown in FIG.
As shown in FIG. 3, the next page of the original Pn at the time when the leading end of the next page of the original Pn has reached the non-shading range.
Means the distance in terms of the number of transport pulses between the end of the scan line Ls and the scan line Ls.

When the result of the determination 155 is Yes, the leading end of the next page of the document Pn has reached the scan line Ls. Therefore, the reading operation of the process 114 is performed with the next page of the document Pn as a new document to be read. 13, when the leading end of the next page of the document Pn reaches the shading impossible range, as shown in FIG.
Even if the trailing end is read, the original Pn of the next page can be correctly read from the beginning.

As described above, according to the present embodiment, it is possible to minimize the document interval at the time of continuous reading of a plurality of documents, thereby enabling continuous high-speed reading of a plurality of documents.

[0054]

According to the first aspect of the present invention, by monitoring the leading edge position of the next page while the previous page is being conveyed, an accurate next page reading start position can be obtained even when the interval between pages is short. Thus, an effect that the original image information can be read accurately can be obtained.

According to the second aspect of the invention, in addition to the same effect as in the first aspect, by monitoring the leading edge position of the next page during the previous page conveyance, the next page reading is started from the stamped position. Even when the position is prioritized and the inter-page cannot be ensured due to the deterioration of the performance of the ADF separation unit, an effect that the reading operation can be executed without causing an error is obtained.

According to the third aspect of the present invention, the user is notified that the control for shifting the stamping position has been executed or remains as a history, so that the separation performance of the ADF is degraded or unacceptable. It is possible to notify that an appropriate document has been read, and it is possible to obtain an effect that the document can be used as ADF maintenance data.

According to the fourth aspect of the invention, in addition to the same effects as those of the first aspect, by using the shading correction data of the previous page for the next page as it is, the space between pages is reduced due to the deterioration of the performance of the ADF separation unit. Even if you can't secure it,
The effect is obtained that the reading operation can be executed without causing an error.

According to the fifth aspect of the present invention, the user is notified that the page has not been subjected to the shading correction control, or the page is left as a history so that the AD can be controlled.
It is possible to notify that the separation performance of F has been lowered or that an improper document has been read, and it is possible to obtain an effect that it can be used as maintenance data of the ADF.

[Brief description of the drawings]

FIG. 1 is a diagram showing a block configuration of a facsimile apparatus as an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a scanner unit of the facsimile apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIG.

FIG. 5 is a flowchart showing a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIGS. 3 and 4;

FIG. 6 is a flowchart showing a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIGS. 3, 4, and 5;

FIG. 7 is a flowchart showing a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIGS. 3, 4, 5 and 6;

8 is a flowchart showing a reading process procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIGS. 3, 4, 5, 6 and 7. FIG.

FIG. 9 is a flowchart showing a reading processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIGS. 3, 4, 5, 6, 7, and 8;

FIG. 10 is a diagram illustrating a positional relationship between a document of a previous page and a document of a next page in a scanner unit of the facsimile apparatus according to the embodiment of the present invention;

FIG. 11 is a diagram different from FIG. 10 showing a positional relationship between a document of a previous page and a document of a next page in the scanner unit of the facsimile apparatus according to the embodiment of the present invention;

FIG. 12 is a diagram different from FIG. 10 or FIG. 11 showing a positional relationship between a document of a previous page and a document of a next page in the scanner unit of the facsimile apparatus according to the embodiment of the present invention;

FIG. 13, FIG. 11, or FIG. 1 showing the positional relationship between the original of the previous page and the original of the next page in the scanner unit of the facsimile apparatus according to the embodiment of the present invention;
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 2 Scanner 3 Plotter 4 Operation display part 5 Image memory 6 Parameter memory 7 Clock circuit 8 PC-I / F 9 Character generator 10 RAM 11 ROM 12 CPU 13 Encoding / decoding part 14 Communication control part 15 Modem 16 Network control Unit 27 System Bus 30 Personal Computer La Lamp P Original Pn Next Original Pp Previous Original R0, R1 Reading Roller R2 Roller R3 Ejection Roller Rf Feed Roller Rr Reverse Roller S0 Document Width Sensor S1 Document Sensor S2 Reference Position Sensor St Stamp W White Reference Board

Claims (5)

[Claims] When a detection is made that the leading edge of a document to be read has passed a predetermined reading reference position while separating and feeding a plurality of set documents and sequentially transporting one page at a time, scanning is performed from the reading reference position. When reading is started after the document is further conveyed to the line and read to the rear end of the document to be read, a reading operation of conveying the rear end to a predetermined stamping position is performed by reading a new document next to the document to be read. An image reading apparatus which repeatedly obtains image information for each of the plurality of set originals, which is repeatedly performed as a target original, wherein a reading reference for detecting whether or not the leading end of the original has passed the predetermined reading reference position. Position detecting means, stamping position detecting means for detecting whether or not the rear end of the document to be read has been conveyed to the predetermined stamping position; Before the stamp position detecting means detects that the rear end of the document to be read has been conveyed to the predetermined stamp position, the leading edge of the next document after the document to be read has passed the predetermined reading reference position. When the next document as a new document to be read is detected by the reading reference position detecting means, the stamp is imprinted after the leading end of the next document has passed the predetermined reading reference position. The conveyance distance until the position detection means detects that the rear end of the document to be read has been conveyed to the predetermined stamping position is conveyed by a distance obtained by subtracting from the predetermined distance from the reading reference position to the scan line. An image reading apparatus comprising: a reading start position assurance unit for starting reading after the reading. 2. When it is detected that the leading edge of a document to be read has passed a predetermined reading reference position while separating and feeding the set plurality of documents and sequentially transporting one page at a time, scanning is performed from the reading reference position. When reading is started after the document is further conveyed to the line and read to the rear end of the document to be read, a reading operation of conveying the rear end to a predetermined stamping position is performed by reading a new document next to the document to be read. In an image reading apparatus which repeatedly obtains image information for each of the set plurality of originals by repeatedly performing as a target original, a reading reference position for detecting whether or not the leading end of the original has passed the predetermined reading reference position Detecting means; stamping position detecting means for detecting whether or not the rear end of the document to be read has been conveyed to the predetermined stamping position; Limit position detecting means for detecting whether or not the scanning reference position has been reached to a predetermined limit position in front of the scan line, and the stamp imprint position detecting means detects that the rear end of the document to be read reaches a predetermined stamp imprint position. Before detecting that the document has been conveyed, if the reading reference position detecting means detects that the leading end of the document following the reading target document has passed the predetermined reading reference position, the leading end of the next document is detected. After passing through the predetermined reading reference position, the limit position detection is performed until the stamping position detecting means detects that the rear end of the document to be read has been conveyed to the predetermined stamping position. If the means does not detect that the leading edge of the next original of the original to be read has reached the predetermined limit position, the next original as a new original to be read After the leading end of the next original has passed through the predetermined reading reference position, and until the stamping position detecting means detects that the rear end of the original to be read has been conveyed to the predetermined stamping position. While the transport distance is reduced by a predetermined distance from the reading reference position to the scan line, the reading is started after the reading is started, and the leading edge of the next document passes through the predetermined reading reference position. By the time the stamping position detecting means detects that the trailing edge of the document to be read has been conveyed to the predetermined stamping position, the leading edge of the next document to be read by the limit position detecting means is When it is detected that the document has reached the predetermined limit position, the transport operation of the document to be read to the predetermined stamp stamping position is not performed, and a new An image reading apparatus comprising: a reading start position assurance unit that starts reading after a next document as a document to be taken is conveyed by a distance corresponding to the scan line from the predetermined limit position. apparatus. 3. After the leading edge of the next document has passed the predetermined reading reference position, the stamping position detecting means determines that the trailing edge of the document to be read has been conveyed to the predetermined stamping position. If it is detected by the limit position detecting means that the leading end of the next original of the original to be read has reached the predetermined limit position until the detection, the output indicating that the stamp imprint position is shifted or 3. The image reading apparatus according to claim 2, further comprising: means for storing a history. 4. When it is detected that the leading edge of a document to be read has passed a predetermined reading reference position while separating and feeding the set plurality of documents and sequentially transporting one page at a time, scanning is performed from the reading reference position. When reading is started after the document is further conveyed to the line and read to the rear end of the document to be read, a reading operation of conveying the rear end to a predetermined stamping position is performed by reading a new document next to the document to be read. In an image reading apparatus which repeatedly obtains image information for each of the set plurality of originals by repeatedly performing as a target original, a reading reference position for detecting whether or not the leading end of the original has passed the predetermined reading reference position Detecting means; stamping position detecting means for detecting whether or not the rear end of the document to be read has been conveyed to the predetermined stamping position; Limit position detecting means for detecting whether or not the scanning reference position has been reached to a predetermined limit position in front of the scan line, and the stamp imprint position detecting means detects that the rear end of the document to be read reaches a predetermined stamp imprint position. Before detecting that the document has been conveyed, if the reading reference position detecting means detects that the leading end of the document following the reading target document has passed the predetermined reading reference position, the leading end of the next document is detected. After passing through the predetermined reading reference position, before the reading up to the rear end of the reading target document is completed, the leading end of the next document after the reading target document is moved to the predetermined limit by the limit position detecting means. If it is not detected that the document has reached the position, for the next document as a new document to be read, the leading edge of the next document passes through the predetermined reading reference position and Reading is started after transporting the transport distance until the reading to the rear end of the document to be read is completed from a predetermined distance from the reading reference position to the scan line, and then starting reading. After the leading end of the original has passed the predetermined reading reference position, and before the reading to the trailing end of the original to be read is completed, the leading end of the original next to the original to be read is set by the limit position detecting means. If it is detected that the limit position has been reached, the shading correction data for the next original is not read, and the shading correction data for the next original is used as the shading correction data for the next original. For the next original as a new original to be read, a distance corresponding to the scan line from the predetermined limit position is used. Image reading apparatus characterized by comprising a reading start position assurance device starts reading from the transport. 5. After the leading end of the next original has passed the predetermined reading reference position and before the reading to the rear end of the original to be read is completed, the limit position detecting means detects the original of the reading original. When it is detected that the leading end of the next document has reached the predetermined limit position, the apparatus further comprises means for outputting or / and retaining a history indicating that shading correction data could not be read. The image reading device according to claim 4, wherein