JP3337156B2 - Blank document detection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for detecting a blank document in a digital image reading apparatus such as a computer scanner or a facsimile capable of performing a prescan, and more particularly to a technique for detecting a blank state of a document by prescan at a high speed. The present invention relates to a blank document detection mechanism suitable for performing the above operation.

[0002]

2. Description of the Related Art Generally, in a facsimile as a digital image reading apparatus, a reading section of a document is fixed, and the document side is sent out by a stepping motor or the like at every reading cycle. In this case, the original that has been read once is discharged, so after the reading operation for detecting a blank original with nothing described, such as the back side of the original, the same original is read again for transmission. Can not do. Therefore, the operation of detecting a blank document must be performed during a normal reading operation (for transmission).

The speed of this normal reading operation depends on the setting condition of the line density. For example, when the line density to be read is set finely, the reading time for one page becomes long. As a result, the operation of detecting the blank state of the document is also delayed, and it takes a long time before a determination is made. In particular, when image data read from a document is not stored and sent directly, even if the read document is blank, the image information is sent to the other party until the result of determining whether or not the document is blank is obtained. Will continue to send. The prior art related to such a facsimile blank page original detection technology includes:
For example, JP-A-1-137880 and JP-A-1-137880
220958, JP-A-3-256443,
JP-A-62-262561, JP-A-63-186
No. 76, for example.

A digital image reading apparatus such as a computer scanner or a high-performance facsimile, in which an original is fixedly placed on a contact glass and a reading unit (light source, mirror, etc.) moves, is disclosed in, for example,
-20170, JP-A-2-116266, JP-A-4-35155, JP-A-4-3725
As described in Japanese Patent Laid-Open Publication No. 8 (1999), a technique of performing a pre-scan before a main scan is used. That is, an original is read once by pre-scanning, data such as the size, position, and density of the original is acquired, and various types of data during the main scan are performed based on the data obtained by the pre-scanning.

[0005] Even in such a fixed digital image reading apparatus, the operation of reading and transmitting a blank document should be avoided, and the determination of the blank document must be made in a short time. However, none of these prior arts has proposed a technique relating to detection of a blank document by pre-scanning, and a technique for determining a blank document in a short time. For example, a CCD (Charge Couple) used for reading image information
(led device, charge-coupled device) requires time to accumulate image information (1 millisecond per line, etc.). Even in pre-scan for acquiring data such as the size, position, and density of a document, Its speed cannot be increased.

In the prior art, since pre-scan and main scan are generally performed in the same moving direction,
After the pre-scan operation and the main scan operation,
It is necessary to return the reading unit to the start position, and a time loss occurs until the next blank document detection operation. Also,
Normally, for the reading operation, the linear density is set, and the scanning is performed at a speed corresponding to the set value of each linear density. I will.

[0007]

The problem to be solved is that the prior art does not consider the pre-scan for detecting the blank state of the original, and in particular, the detection operation of the blank original is not considered. No consideration is given to how fast it is performed, and it is not possible to judge a blank document in a short time. SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, to efficiently determine a blank document, to avoid wasting time and memory use in reading and transmitting operations of a blank document, and to realize a digital image reading apparatus. An object of the present invention is to provide a blank document detecting mechanism capable of improving performance.

[0008]

In order to achieve the above object, a blank document detecting mechanism according to the present invention comprises: (1) a digital image reading device for moving an image reading section, scanning a document, and reading an image signal of the document; Blank sheet of information reading device
A document detection mechanism that automatically transports the document to the reading position
Document feeder and document transport by automatic document feeder
During image reading, the image reading section
The prescan control unit that moves the
The direction opposite to the document being conveyed by the automatic document feeder by the control unit
Based on an image signal read by the image reading unit being moved in, and said Rukoto which have a and blank document page detection part document being conveyed is determined whether or not the blank. Further, (2) the Te blank document page detection mechanism smell according to (1), up rescan controller, an image reading unit, the movement of the main scan
The direction and wherein Rukoto is moved in the opposite direction. (3) In the blank document detecting mechanism according to any one of (1) and (2), the pre-scan control unit may control the movement of the image reading unit to be able to set the movement of each of the image reading units in advance.
Characterized that you control at the fastest speed of each speed corresponding to Ri linear density. Also, (4) the above (1) or
In the blank document detection mechanism according to any one of (2) ,
The pre-scan control unit moves the image reading unit in advance.
Higher than each speed corresponding to each configurable reading line density
Characterized that you control at a predetermined speed to the speed.

[0009]

According to the present invention, at the time of pre-scan, only white / black of a document is determined. Even when the document is operated at a speed several times faster than that at the time of main scan, for example, several lines / millisecond,
Since there is no hindrance to the accumulation operation of D, the reading unit is moved at the highest speed mode of the apparatus, or at a speed that can be operated mechanically fastest in the specifications of the apparatus, regardless of the mode, Perform pre-scan. In addition, by performing the pre-scan in the retrace interval of the main scan, that is, in the reverse direction, the pre-scan and the main scan can be performed only by making the reading unit make one reciprocation, and the blank original detecting operation by the next pre-scan is performed. And the speed of the entire document reading operation can be increased. In the case of using the ADF (automatic document feeding mechanism) to feed the document, A D
By performing prescan for detecting a blank document in the direction opposite to the direction in which the document is fed by F, the reading operation of the document can be further speeded up.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a configuration relating to the present invention of a blank document detecting mechanism of the present invention.
In this figure, 1 is a document to be read, 2 is a contact glass for positioning the document 1, 2a is a document holding plate for fixing the document 1 on the contact glass, and 3 is a document 1 placed on the contact glass 2. An image reading unit 4 for generating an image signal from the image forming unit 4 constitutes an image reading unit 3 and includes a mirror, a lens and the like, and moves between A and B in the figure to move the original 1
And a CCD, which constitutes an image reading section 3 and converts an image of the original 1 formed by the traveling body 4 into an image signal, and 6 is an image signal converted by the CCD 5 An image processing unit that performs encoding and transmission processing of
A blank document detecting unit for determining whether or not the density of the document 1 indicates a blank state based on the image signal converted by the CD 5; a line density mode storage unit 7 for storing a line density set by an operator; Reference numeral 8 denotes a motor or the like, a traveling body movement control unit that controls the movement of the traveling body 4 based on the document size specified by the operator, the storage content of the linear density mode storage unit 7, and the like. The first blank document pre-scan control unit according to the present invention, which performs operation control during movement of the traveling body 4 instead of the traveling body movement control unit 8 at the time of pre-scanning for detection.

In order to convert an image signal in the CCD 5, the CCD 5 must accumulate the converted image signal for a predetermined time. For example, there is a limit such as 1 millisecond per line. Therefore, the moving speed of the traveling body 4 must be limited. In addition, the traveling speed of the traveling body 4 needs to be controlled by the traveling body movement control unit 8 based on the linear density set by the operator. For example, in order to obtain an image signal with a high linear density, the traveling body 4 must move at a low speed.

However, if only the density for judging the blank state of the document 1 is obtained instead of reading the written content of the original 1, the corresponding low-speed operation is performed even when the mode of high line density is set. It is not necessary to move the vehicle 4 at speed. Therefore, at the time of prescan for determining the blank state of the document, the movement control of the traveling body 4 is performed by the first blank document prescan control unit 9, and the setting with the lowest line density is performed irrespective of the line density setting mode. The traveling body 4 is moved from A to B at the mode speed, that is, at the highest speed mode. Hereinafter, such a processing operation will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 2 is a flowchart showing a specific example of the operation of the blank document detecting mechanism in FIG. 1 according to the present invention. The operator places the original on the contact glass (step 101), and inputs the line density, density, number of copies, and the telephone number of the other party for facsimile transmission via the operation unit (step 102), and starts. When the button is pressed (step 103), regardless of the line density set in step 102, the prescan is performed in the fastest line density mode to return the traveling body to the original position (step 10).
4). If the result of the pre-scan is blank and the original is blank and the original is not blank and has normal description (step 105), step 102 is executed.
The traveling body is moved at a speed corresponding to the linear density set in step (1), and an image signal is read from the document (step 106). Further, if the determination result in step 105 is YES, that is, if the original is turned over and the original is in a blank state, it is determined that the blank original is placed.
Notify the operator via the display unit or the like (Step 10
7). As described above, regardless of the line density setting mode, a high line density is set by pre-scanning in the line density mode in which the reading speed in the main scan is the fastest and determining the blank state of the document. Also in this case, the time required for the determination can be reduced.

FIG. 3 is a block diagram showing a second embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention. In the second embodiment, a second blank document prescan control unit 10 is provided in place of the first blank document prescan control unit 9 in the blank document detection mechanism of the first embodiment shown in FIG. Configuration. In the second embodiment, the second blank document prescan control unit 10 performs the above-described first blank scan at the time of prescan for determining a blank document.
The traveling body 4 is moved from A to B at a speed which can move fastest in the specification of the apparatus provided with the blank document detecting mechanism of the present embodiment such as a facsimile, regardless of the line density setting mode as in the embodiment. As described in the first embodiment, CC
The storage time of D has a limit of 1 millisecond per line, etc.
There is no problem even if it is operated at several times the speed, such as 1 millisecond,
The traveling body 4 is moved at the maximum speed that does not cause this trouble. As a result, the blank state of the document can be determined in a shorter time.

FIG. 4 is a flowchart showing a specific example of the operation of the blank document detecting mechanism in FIG. 3 according to the present invention. In this example, the process in step 104 of the flowchart shown in FIG. 2 is changed, and the operator
When the processing of steps 201 to 203, that is, the setting of the original and the input of the line density and the like are performed and the start button is pressed, the operation can be performed at the highest speed regardless of the line density set in step 202 and in the specification. Prescanning is performed at the speed to return the traveling body to the original position (step 204). The operation based on the determination result of the blank state of the document by the pre-scan is the same as the processing of steps 105 to 107 in the flowchart shown in FIG. 2, and a description thereof will be omitted.

As described above, by performing the pre-scan by moving the running body at the fastest moving speed set in the specification without depending on the setting mode of the linear density, the time required for determining the blank state of the document is reduced. It can be further shortened. In the first and second embodiments described above, the traveling direction of the traveling body is the same in both the pre-scan and the main scan, and after each operation, the traveling body must be returned to the original position. Must. Hereinafter, a third embodiment according to the present invention which addresses such a problem will be described.

FIG. 5 is a block diagram showing a third embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention. The third embodiment has a configuration in which the pre-scan direction control unit 11 according to the present invention is provided in the blank document detection mechanism of the first embodiment shown in FIG. By the pre-scan direction control unit 11, in the blank document detection mechanism of the third embodiment, the operation of the first blank document pre-scan control unit 9 is performed in the retrace interval of the traveling body movement control unit 8. That is, at the point in time when an instruction to read the original 1 placed on the contact glass 2 is input, the traveling body 4 is at the position B in the drawing. Then, the first blank document prescan control section 9 is activated, and the traveling body 4 is moved from the direction B to the direction A to perform the prescan.

If the traveling body 4 arrives at A in the pre-scan and the blank document detection unit 6a does not determine the blank state of the document, the pre-scan direction control unit 11 activates the traveling body movement control unit 8. Then, the traveling body 4 is moved from A to B to perform a main scan. The traveling body 4 is stopped at the position B to prepare for the prescan of the next document. As described above, in the third embodiment, since the pre-scan is performed using the retrace interval of the main scan, the main scan and the pre-scan can be performed only by reciprocating the traveling body once.

FIG. 6 is a flowchart showing one specific example of the operation of the blank document detecting mechanism in FIG. 5 according to the present invention. The operator places the original on the contact glass (step 301), and inputs the line density, density, number of copies, and the telephone number of the other party for facsimile transmission via the operation unit (step 302), and starts. When the button is pressed (step 303), prescanning is performed from a fixed position on one side (position B in FIG. 5) to the opposite side (position A in FIG. 5) (step 304). The prescan speed is set to the fastest line density mode regardless of the line density set in step 302.

If the result of the prescan is negative, and if the original is not blank and has normal written contents (step 305), it returns to the original position (position B in FIG. 5). Moving the traveling body at a speed corresponding to the linear density set in step 302,
The image signal is read from the original (step 30).
6). If the result of the determination in step 305 is YES, that is, if the document is blank, the operator is notified via the display unit or the like that a blank document is placed (step 307), and the document is read. The traveling body is returned to the original position (the position B in FIG. 5) without performing (Step 308). In this manner, the pre-scan and the main scan can be performed in one reciprocation of the traveling body, and the entire document reading operation time including the blank document determination can be reduced.

In the blank document detecting mechanism in the first to third embodiments, the automatic document feeder, that is, A
By providing a DF, a document can be automatically set at a predetermined position on the contact glass. When the ADF is provided, in the above-described first to third embodiments, the prescan is started when the document is conveyed to a predetermined position on the contact glass by the ADF and stopped.
By utilizing the document feeding operation by the ADF,
The blank document detection operation according to the present invention can be performed more efficiently. Hereinafter, a fourth embodiment according to the present invention using an ADF will be described.

FIG. 7 is a block diagram showing a fourth embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention. In the fourth embodiment, the ADF 12 for transporting the original 1 to the reading position on the contact glass 2 (A side in the figure) is provided in the blank original detection mechanism of the first embodiment shown in FIG.
The configuration includes an ADF detection unit 13 that detects the activation of the DF 12 and a first ADF correspondence control unit 14 according to the present invention. The document holding plate 2a in FIG. 1 has been removed to provide the ADF 12. First ADF
In the blank document detecting mechanism according to the fourth embodiment, the blank control unit 14 performs the blank document detecting operation of the blank document detecting unit 6a while the ADF 12 is conveying the document.

That is, when the document 1 is set on the ADF 12, the first ADF correspondence control unit 14 is activated via the ADF detection unit 13, and the first ADF correspondence control unit 14
The traveling body 4 is stopped near the document entrance of the ADF 12 (position A in the figure). In this state, original 1
Is loaded, the image reading unit 3 sets the traveling body 4 and the CC
By D5, conversion into an image signal of the original 1 being conveyed is performed. Based on this image signal, the blank document detection unit 6a performs an operation of determining the blank state of the document 1. ADF12
After the trailing edge of the document 1 is once sent out to a position exceeding A in the figure, the operation of returning the trailing edge of the document 1 to the position A in the figure is performed, and accurate positioning can be performed.

As described above, the traveling body 4 is stopped at the ADF 12 side, and the ADF 12 performs a prescan on the original 1 conveyed to a predetermined position on the contact glass 2. As a result, when the original 1 is conveyed to the predetermined position on the contact glass 2 and stopped, the prescan operation has been completed. In particular, in this example, the traveling body 4 is at the original reading position and The reading operation of a document including scanning can be further speeded up. Note that the prescan speed in this case is not the moving speed of the traveling body but the document feed speed of the ADF.

FIG. 8 is a flowchart showing one specific example of the operation of the blank document detecting mechanism in FIG. 7 according to the present invention. The operator sets a document on the ADF (step 401), and inputs a line density, density, the number of copies, and a telephone number of a destination for facsimile transmission via the operation unit (step 402). When the start button is pressed (step 403), the traveling body is stopped at the document loading side of the ADF (position A in FIG. 7) (step 40).
4) The original is carried in from the ADF, and a pre-scan is performed on the carried-in original to detect a blank state (step 405).

If the result of the pre-scan is negative, and the original is not blank and has normal description (step 406), the position is set in step 402 from this position. The traveling body is moved at a speed corresponding to the linear density (from A to B in FIG. 7).
F), the image signal is read from the original (step 407), and the running body is moved to the original position (position A in FIG. 7).
(Step 408). If the determination result in Step 406 is YES, that is, if the original is in a blank state, the original is discharged and the operator is notified via the display unit or the like that a blank original is placed (Step 40).
9). In this way, the moving body is stopped, and the original is
The pre-scanning speed depends on the document feed speed of the ADF since the pre-scanning is performed when the document is conveyed to the contact glass. However, when the document is conveyed to a predetermined position on the contact glass and stopped, the pre-scanning is performed. Finished.

In FIG. 7, if the document entrance of the ADF 12 is on the opposite side of the reading position of the document 1 (position B in FIG. 7), after the pre-scan, the traveling body 4 is moved to the ADF 1.
The main scan is performed by returning the original to the original reading position from the original entrance 2, but this return operation does not require the original reading operation and can be performed at high speed. Then, after the main scan, the ADF 12 stops at the original loading port and the pre-scan for the next original 1 from the ADF 12 is performed. However, by moving the traveling body 4 in synchronization with the document transport operation of the ADF 12, the pre-scan for detecting the blank document when the document carrying entrance of the ADF 12 is on the opposite side to the reading position of the document 1 is performed. It can be performed more efficiently. Such an example will be described with reference to FIGS.

FIG. 9 is a block diagram showing a fifth embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention. The ADF 12a in this example is for loading the original 1 from the side opposite to the reading position. Also, the second ADF correspondence control unit 15 provided in place of the first ADF correspondence control unit 14 in FIG.
a transports the document 1 in one direction from the document entrance to the document reading position (position A in the figure).
The original being transported is moved from the original entrance to the original reading position while overtaking the original.

By providing the second ADF correspondence control unit 15 in this manner, the blank document detection unit 6a can determine the blank state of the document 1 while the ADF 12a conveys the document, and the document can be stored in a predetermined state. When the carriage 4 is set at the reading position, the traveling body 4 has moved to the predetermined document reading position, and the main scan can be started immediately after the conveyance of the document 1 is completed. The document reading operation involving the prescan can be performed in a short time. In this example, the prescan speed is determined by the document feed speed of the ADF 12a and the moving speed of the traveling body 4.

FIG. 10 is a block diagram showing a sixth embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention. The ADF 12a in this example is for loading the original 1 from the side opposite to the reading position. Further, the third ADF correspondence control unit 16 provided in place of the first ADF correspondence control unit 14 in FIG.
When the document a is transported in one direction from the document entrance to the document reading position, the traveling body 4 is moved from the document reading position (A position in the drawing) to the document entrance (B position in the drawing). That is, the document 1 is moved to a predetermined position in the direction opposite to the document 1 being transported, and the pre-scan for determining the blank state of the document 1 by the blank document detection unit 6a is performed while the document 1 is being transported by the ADF 12a. .

As described above, the third ADF corresponding control unit 16 is provided, and the prescan for detecting a blank document is performed by the ADF1.
2A, the pre-scanning speed is reduced by the ADF 12a.
And the moving speed of the traveling body 4, and the time required for the prescan can be further reduced. Further, the moving distance of the traveling body 4 to a predetermined position during the pre-scan can be determined by detecting the length of the document 1 by the ADF 12a. Then, the traveling body 4 is moved from this predetermined position to the position A in the figure, and the main scan of the document 1 is performed. As described above, in this example, the reading position of the document is not the position A in the figure but the predetermined position where the pre-scan has been completed. The document reading operation with the pre-scan for the document can be performed in a shorter time.

FIG. 11 is a flow chart showing a specific example of the operation of the blank document detecting mechanism in FIG. 10 according to the present invention. The operator sets a document on the ADF (step 501), and inputs a line density, density, the number of copies,
If it is for facsimile transmission, enter the telephone number of the other party (step 502) and press the start button (step 503). Then, the running body is moved to the opposite side of the ADF original loading side (position A in FIG. 10). It is stopped (step 504). In this state, the original is loaded from the ADF, and the running body is moved in synchronization with the loading of the original.
F is moved to a predetermined position (a position corresponding to the size of the original) to the original loading side of F (the side B in FIG. 10) to perform prescan for detecting a blank original (step 50).
5).

If the result of this pre-scan is blank and the original is blank and the document is not blank and has normal written contents (step 506), the process proceeds to step 402 from the position where the pre-scan is completed. The traveling body is moved at a speed corresponding to the set linear density (to the A side in FIG. 10), and an image signal is read from a document (step 507). By this reading operation, the traveling body returns to the original position (position A in FIG. 10). Also,
If the determination result in step 506 is yes, that is,
If the original is blank, the original is ejected, the operator is notified via a display or the like that a blank original is placed (step 508), and then the travel value is returned to the original position (step 508). (Step 509). As described above, by performing the pre-scan operation in the direction opposite to the document feeding direction from the ADF, the pre-scanning speed becomes the sum of the document feeding speed of the ADF and the movement of the traveling body, and the time required for determining a blank document is reduced. It can be further shortened.

As described above with reference to FIGS. 1 to 11, the blank document detecting mechanism of the present embodiment does not hinder the accumulation operation of the CCD at the time of pre-scanning for discriminating white / black of the document. The reading unit is moved at the highest possible speed. As a result, the speed of the original reading operation accompanied by the prescan for detecting the blank original can be increased. In particular, when the ADF is used, the speed of the prescan and the main scan can be further increased by controlling the movement of the traveling body in an efficient direction and timing.

The present invention is not limited to the embodiment described with reference to FIGS. 1 to 11, but can be variously modified without departing from the gist thereof. For example, the third
In the second embodiment, the pre-scan direction control unit is provided in the blank document detection mechanism of the first embodiment, but the pre-scan direction control unit is provided in the blank document detection mechanism of the second embodiment. Is also good. Also, a configuration is used in which the pre-scan performed in the direction opposite to the document transport direction of the ADF in the fifth and sixth embodiments shown in FIGS. 9 to 11 corresponds to the ADF in the fourth embodiment shown in FIG. But it is good. In this case, in the retrace interval in which the traveling body is returned to the original position after the main scan, the pre-scan for the next original loaded from the ADF is performed, thereby further improving the original reading operation in the fourth embodiment. Speed can be increased.

[0036]

According to the present invention, it is possible to determine the blank state of a document by prescanning at a high speed, to avoid wasting time and memory use in reading or transmitting a blank document, and to use a facsimile machine. It is possible to improve the performance of a digital image reading apparatus capable of pre-scanning.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a configuration according to the present invention of a blank document detecting mechanism of the present invention.

FIG. 2 is a flowchart showing a specific example of the operation of the blank document detecting mechanism in FIG. 1 according to the present invention.

FIG. 3 is a block diagram showing a second embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention.

4 is a flowchart showing a specific example of the operation of the blank document detecting mechanism in FIG. 3 according to the present invention.

FIG. 5 is a block diagram showing a third embodiment of a blank document detecting mechanism according to the present invention of the present invention.

FIG. 6 is a flowchart showing a specific example of the operation of the blank document detecting mechanism in FIG. 5 according to the present invention.

FIG. 7 is a block diagram showing a fourth embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention.

8 is a flowchart showing a specific example of the operation of the blank document detection mechanism in FIG. 7 according to the present invention.

FIG. 9 is a block diagram showing a fifth embodiment of the configuration according to the present invention of the blank document detecting mechanism of the present invention.

FIG. 10 is a block diagram showing a blank document detecting mechanism according to a sixth embodiment of the present invention;

11 is a flowchart showing a specific example of the operation of the blank document detection mechanism in FIG. 10 according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 document 2 contact glass 2 a document holding plate 3 image reading unit 4 running body 5 CCD 6 image processing unit 6 a blank document detection unit 7 linear density mode storage unit 8 running body movement control unit 9 first blank document prescan control unit 10 Second blank document pre-scan control unit 11 Pre-scan direction control unit 12, 12a ADF 13 ADF detection unit 14 First ADF correspondence control unit 15 Second ADF correspondence control unit 16 Third ADF correspondence control unit

Claims (4)

(57) [Claims] The image reading means is moved to scan a document.
Scan and scan the image signal of the original
Tal image information reading deviceThe blank document detection mechanism
hand,Automatic document feeding means for transporting the document to the reading position
When, While the document is being conveyed by the automatic document feeding means,
Move the image reading means in the direction opposite to the
Prescan control means for By the pre-scan control means, the automatic document feeding means
Reading the image while moving in the opposite direction to the original being transported
By means Based on the read image signal,In transitoriginal
A blank document detecting means for determining whether the manuscript is blankTo
HaveA blank document detection mechanism. 2. A blank document page detection mechanism according to claim 1, upper Kipu rescan control means, upper Symbol image reading means
In the direction opposite to the direction of the main scan
Blank document page detection mechanism, characterized in Rukoto to have a means. 3. The blank document detecting mechanism according to claim 1, wherein said pre-scanning control means includes a pre-scanning control means for controlling said image reading means .
Movement can be set in advance for each preset
Blank document page detection mechanism, characterized in Rukoto to have a means for controlling at the fastest rate of speed. 4. The method of claim 1, or, in the blank document page detection mechanism according to any of claims 2, the pre-scan control means, the image reading unit
Movement can be set in advance for each preset
A means for controlling at a predetermined speed higher than the speed
Blank document detection mechanism, wherein Rukoto that Yusuke.