JP2002268467A - Image reading device and image forming device - Google Patents

Abstract

(57) [Summary] Even if a document has a defect such as a perforation, the document is read in the specified range by designating the document reading range. In an image reading apparatus for automatically detecting a document length of a read document in a sub-scanning direction by a document length detection sensor and reading the document, an operation display unit for manually setting the document length; When the document length is set by the operation display unit 6, there are provided means 1 and 10 for controlling to read the document with the set document length. Even if there is a defect such as a hole before the designated document length, the document is read up to the designated document length without stopping reading.

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 which automatically detects or manually designates a document width and a document length to determine an image reading range, reads an image in this range, and an image reading apparatus of this kind. The present invention relates to an image forming apparatus having the same.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus that automatically detects a document width and a document length while moving the document and reads image information of the document, the document width is detected at the start of a reading operation, and the width is detected. While reading a document image, the length of the document (document length) is measured, and an image corresponding to the document length is compared with a read paper size to perform reading. In the case of a document having an irregular document width, a maximum reading range is set, and reading is performed in this range. A document sheet on which an image is read by such an image reading apparatus is a condition that the sheet itself does not have a physical defect such as a tear, a tear, a break, or a hole.

[0003]

However, there are cases in which it is necessary to actually read a document sheet having a physical defect. In such a case, the image reading device erroneously detects the defective portion as the end point of the document width or the document length, and there is a problem that the image reading expected by the user is not performed. In order to avoid this, scanning may be performed by specifying the maximum reading range.However, in this method, reading may be performed up to a portion that is not required to be read. There was a problem that it would.

The present invention has been made in view of such a problem, and an object of the present invention is to specify an original reading range even if the original has a defect such as a tear or a hole. Provided is an image reading device that prevents an image reading operation from being completed in a portion or ignores a defective portion due to the content of a document and eliminates omission of reading, and an image forming apparatus provided with this type of image reading device. It is.

[0005]

According to a first aspect of the present invention, there is provided an image reading apparatus for automatically detecting a length of a document to be read in a sub-scanning direction and reading the document, and setting the document length manually. An image reading apparatus comprising: means for controlling reading of a document with the set document length when the document length is set by the setting means.

According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, when the document length is set by the manual setting means, the controller automatically detects the set document length and the automatic detection. An image reading apparatus is characterized in that the length of the original is compared with the length of the original detected by the means, and the original is read with the longer original.

According to a third aspect of the present invention, there is provided an image forming apparatus including the image reading apparatus according to the first or second aspect.

[0008]

Embodiments of the present invention will be described below. FIG. 1 is a schematic block diagram of a main part of an image reading apparatus in which the present invention is implemented. In the figure, an image reading apparatus includes a CPU 1 for controlling the entire apparatus, a ROM 2 for storing various control programs, and a read image. A RAM 3 for temporarily storing information, a non-volatile RAM 4 for storing information to be stored even when the power is turned off, an operation display unit 6 including a liquid crystal screen, a touch panel or operation keys, a document width detection sensor 7, and a document length detection sensor 8 are provided. .

The document width detecting sensor 7 detects the document width based on the presence or absence of a document on a plurality of sensors arranged in the main scanning direction. The document length detection sensor 8 detects the document length by measuring the time when the document is present while the document is moving. The operation display unit 6 and the document width detection sensor 7
The document length detection sensor 8 exchanges signals with the CPU 1 via an input / output (I / O) port 9. Further, the image reading device includes an image processing unit 10 and a CPU.
The image reading range of the image reading sensor 11 is set under the control of 1. The I / O port 12 is, for example, an I / O port that sends an output signal to a motor, a clutch, a solenoid, or the like that drives a traveling body (not shown) of the image reading sensor.
O port

FIG. 2 is a view showing a guidance screen of the operation display unit 6. As shown in FIG. A touch panel is arranged on the screen.Press the part where "Document Width" is displayed and enter a numerical value.If the entered value is zero, it is treated as a document width. Processing is performed based on the document width detected by the detection sensor. In the same way, when the part where "Document Length" is displayed is pressed and a numerical value is input, it is processed as if the document length has been input, and if the input value is zero, the document detected by the document length detection sensor Handle with long. When a value is input to the document length and the "synchro" mode is pressed, the input document length is compared with the document length detected by the document length detection sensor, and the longer one is processed as the document length. .

The operation of such an image reading apparatus will be described with reference to FIG. FIG. 3 is a flowchart showing a procedure for controlling a document reading range in the image reading apparatus described with reference to FIGS. First, when image reading is started from an operation key (not shown) of the operation display unit 6, the CPU 1 checks how the reading width is input, that is, whether the reading width is a manual input or an automatic detection input (S1). When the numerical value input to the operation display unit 6 is zero (S1, YES), the original width detected by the original width detection sensor 7 is set as the original width (S2). (S1, NO), the document width is set (S3).

Next, the CPU 1 checks how the document length has been input (S4). When the numerical value input to the operation display section 6 is zero (S4, YES), the original length is set to the original length detected by the original length detection sensor 8, and the CPU 1 sets the original length selection signal to level H (hereinafter, referred to as "H"). H) (S5), the CPU document length signal is set to H (S6), and the image processing unit 10 starts the document reading operation (S7).

At this time (normal time), the image processing unit 1
In the case of 0, since the document length selection signal and the CPU document length signal are both H, the document length of the document length detection sensor 8 is prioritized.
Then, the document length signal is at level L (hereinafter abbreviated as L).
It is assumed that the reading of the original is completed at the time when the original changes from L to H. Therefore, while the document length detection sensor 8 is detecting the document length, there is a perforated portion, and the document length detection sensor 8 detects this, so that L → H
The reading ends at this point.

If the numerical value input to the operation display section 6 is not zero, that is, if a predetermined numerical value is manually input (S4, NO), it is checked whether or not the synchro mode is set (S8). ). When the synchro mode is set (S8, YES), the CPU 1 sets the document length selection signal to L (S10), and sets the CPU document length signal to L.
Output as (S11).

At this time (at the time of synchronization), since the document length selection signal and the CPU document length signal are both L, the image processing unit 10 determines whether the manually input document length or the document length detected by the detection sensor 8 is longer. The reading operation is started with priority given to the document length (S7). Therefore, during this time, even if there is a perforated portion, reading is performed up to the set document length.

On the other hand, when the mode is not the synchro mode (S8,
NO), the CPU 1 sets the document length selection signal to H (S9),
Then, the CPU original length signal is set to L (S11) and output. Therefore, at this time (when the document length is specified), the reading operation is started with priority given to the manually input document length (S7). Therefore, during this time, even if there is a perforated portion, reading is performed up to this document length.

FIG. 4 is a diagram schematically showing signal levels in the normal mode, the synchro mode, and the document length designation mode described in FIG. In the normal state (a), both the CPU original signal and the original length selection signal are H, and the original length detection sensor 8
When the original length sensor 8 detects a perforated portion, the original length signal changes from L to H, and the reading is terminated.
When the original length is designated (b), the original original length designated manually by the CPU original signal L and original length selection signal H is prioritized, and reading is performed up to the designated original length even if a perforated portion is detected during this period. . In the synchro mode (c), the CPU original signal L and the original length selection signal L give priority to the manually input original length and the original length longer than the original length detected by the detection sensor 8. Even if a perforated portion is detected, reading is performed up to the longer document length.

The image reading apparatus having the above configuration is used by being incorporated in an image forming apparatus such as a copying machine. According to the present embodiment, the original length can be set freely, so that the original reading range can be controlled while assuming the position where perforation or the like occurs.

[0019]

According to the first aspect of the present invention, when the document length is set by manual setting, the document is read prior to the document length of the automatic detection setting means, so that the reading is intended to be completed at the defective portion. The document can be read in the range. For this reason, the original reading operation can be made more efficient. According to the second aspect, when the document length is set by the manual setting unit, the set document length is compared with the document length detected by the automatic detection unit, and the longer document length is determined. Since document reading is performed, reading omission of the document can be eliminated. Advantageous Correspondence of Claim 3: It is possible to provide an image forming apparatus exhibiting the effects corresponding to Claims 1 and 2.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a main part of an image reading apparatus in which the present invention is implemented.

FIG. 2 is a diagram showing a guidance screen of an operation display unit according to the embodiment of the present invention.

FIG. 3 is a flowchart for controlling a document reading range according to the embodiment of the present invention.

FIG. 4 is a diagram showing a document reading signal level according to the embodiment of the present invention.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 4 nonvolatile R
AM, 6 ... operation display section, 7 ... original width detection sensor, 8 ...
Document length detection sensor, 9 I / O port, 10 Image processing unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H012 CB22 CB23 CB30 2H027 DB09 ED04 FA04 FB06 FB07 FB11 FD03 ZA07 5C062 AB02 AB20 AB23 AB33 AB41 AB43 AB44 AC67 AF10 BA00 5C072 AA01 BA05 BA13 RA01 RA06 UA13

Claims (3)

[Claims] An image reading apparatus for automatically detecting the length of a document in the sub-scanning direction of the document to be read and reading the document, setting means for manually setting the document length, and setting the document length by the setting means An image reading apparatus, comprising: means for controlling reading of a document with a set document length when the document is set. 2. The image reading apparatus according to claim 1, wherein
When the document length is set by the manual setting means, the control means compares the set document length with the document length detected by the automatic detection means, and reads the document with the longer document length. An image reading apparatus characterized by performing control so as to perform the following. 3. An image forming apparatus comprising the image reading device according to claim 1.