JP2003319141A - Original reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an original reader capable of correctly reading an original independently of a setting state of the original when a user sets the original to the original reader. <P>SOLUTION: The original reader is configured such that an original position read sensor moves along rails to read positions of both extremes of the original so as to thereby automatically recognize the width, the placed position and the size of the read original and read contents of the original. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a scanner, and the like, and more particularly to a document reading device of a system for reading a document while conveying it.

[0002]

2. Description of the Related Art In a conventional document reading apparatus for reading a document while conveying it, which is used in a copying machine, a scanner, etc., when a document is read, the user sets it according to a prescribed position of the apparatus. The method was the mainstream.

[0003]

However, according to the above-mentioned conventional techniques, when the user sets the document on the reading device, there are the following problems. It is troublesome and troublesome for a user to correctly set a document on a document reading device at a predetermined position if the user is not accustomed to the device or a person who is weak in device operation. If the user cannot set the document correctly, for example, if the user has misplaced the document with respect to the specified position of the reading device, the document will be read only within the specified range of the document reading device. , It does not read as intended by the user. Then, the read data will be missing the part that is placed with a shift. Therefore, the user
It is troublesome and time-consuming to set up the original again. Also, because it repeats again, not only the effort but also
There is also the risk of damaging the manuscript. Therefore, the present invention is
An object of the present invention is to provide a document reading device that can read a document correctly regardless of the set state of the document.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a document width of a document to be read,
The document reading device is characterized by automatically recognizing a document placement position and a document size and automatically reading the corresponding portion.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention is shown in FIG. Further, FIG. 2 shows a plan configuration diagram of FIG. The document reading apparatus according to the first exemplary embodiment of the present invention is provided with a document sensor 1 for detecting the presence or absence of a document, a conveyance roller 2 for conveying a document, and a conveyance roller 2 arranged so as to face the conveyance roller 2. There is a pinch roller 3 that is pressing. The rail 8 is held downstream of the rail 8 and the rail 8 is shown in FIG.
A document position reading sensor 4 for reading the position of the document, which operates in a vertical direction with respect to the document position reading sensor 4,
It is composed of a black portion 5 arranged so as to face the document reading section, a document reading section 6 for reading the content of the document, and a white reflecting plate 7 arranged so as to face the document reading section 6.

Next, the operation of the document reading apparatus according to the first embodiment of the present invention will be described. The presence or absence of a document is recognized by the optical reflection type document sensor 1 for a document placed on the transport surface in parallel with the transport direction by the user. Only when the document is recognized, the transport roller 2 starts rotating clockwise in FIG. 1 by a drive source (not shown). The document is conveyed while being sandwiched between the conveyance roller 2 and the pinch roller 3, and is sent to the downstream side (right side in the drawing). The document sent downstream has a document position reading sensor 4 held on a rail 8 driven by a pulse motor (not shown) in the main scanning direction until the leading edge of the document reaches the document reading unit 6 from the conveyance roller 2. The position of both ends of the document is read by moving along the rail 8 (in the direction perpendicular to FIG. 1). At this time, the apparatus stores the pulse number of the pulse motor, calculates the coordinates of both end portions of the document based on the pulse number, and recognizes the range where the document exists as the coordinates. Based on these coordinates, the document reading portion 6 reads the contents of the document for the designated coordinate range. Further, the time when the document is placed and the document sensor 1 recognizes the presence of the document and then the transportation is started is t1, and the document transportation is started.
Assuming that the time from the end to the end is t2, the apparatus changes the conveyance time t from the presence of the document to the absence of the document (t = t1 +
t2) is recognized, and the length of the document is calculated and recognized from the transport time t and the transport speed unique to the apparatus. Based on this length information, the document reading unit 6 reads for a specified time from the start of reading. It should be noted that the document sensors 1 are arranged at regular intervals in the main scanning direction, and in the example of FIG.
No matter where the originals of A4 size or larger are placed, they are arranged every 210 mm so that they can be read.

As described above, this makes it possible for the user to read the original document no matter where it is, and the device can read the correct range of the original document. Can be read.

In the actual form 1 of FIG. 1, the user had to place the original in parallel to the conveying direction, but in the next embodiment 2 shown in FIG. 3, there is no problem even if the original is placed slightly obliquely. It is possible to read. Note that FIG. 4 is a plan configuration diagram of FIG.

A document reading apparatus according to the second embodiment of the present invention is arranged so as to face a document sensor 1 for detecting the presence or absence of a document, a carrying roller 2a for carrying a document, and a carrying roller 2a. There is a pinch roller 3a that presses the transport roller 2a. Next, there are a transport roller 2b for transporting the original document and a pinch roller 3b arranged to face the transport roller 2b and pressing the transport roller. The rail 8 is held downstream of the rail 8 and the rail 8 is shown in FIG.
A document position reading sensor 4 for reading the position of the document, which operates in a vertical direction with respect to the document position reading sensor 4,
It is composed of a black portion 5 arranged so as to face the document reading section, a document reading section 6 for reading the content of the document, and a white reflecting plate 7 arranged so as to face the document reading section 6.

Next, the operation of the present invention according to the second embodiment will be described. The presence or absence of a document placed on the conveyance surface by the user is recognized by the optical reflection type document sensor 1. Only when the document is recognized, the transport roller 2a starts rotating clockwise in FIG. 3 by a drive source (not shown). The document is conveyed while being sandwiched between the conveyance roller 2a and the pinch roller 3a, and is fed by a fixed amount downstream (right side in the figure). In this state, the transport roller 2b and the pinch roller 3b have not moved yet and have stopped.
The original fed by a fixed amount hits the portion sandwiched between the conveying roller 2b and the pinch roller 3b and hits, and swells between the paper guide 9 and the paper guide 10, and the leading edge of the original is conveyed by the conveying roller 2b and the pinch roller 3b. Parallel to. When the document is fed by a certain amount, the driving of the transport roller 2b is stopped, and then the transport roller 2b starts rotating in the clockwise direction in FIG. 3 to transport the document downstream. Now, the transport roller 2
a and the pressing force Fa between the pinch roller 3a and the conveying roller 2
The pressing force Fb between b and the pinch roller 3b is set so that Fa <Fb. Thereby, the transport roller 2b
The original conveyed by the pinch roller 2b and the pinch roller 2b is slippery at the portion sandwiched by the conveying roller 2a and the pinch roller 3a.

For a document sent further downstream, a document position reading sensor 4 held on a rail 8 is driven by a pulse motor (not shown) until the leading edge of the document reaches the document reading section 6 from the conveying roller 2b. Main scanning direction (Fig. 1
The vertical position) is moved along the rail 8 to read the positions of both end portions of the document. At this time, the apparatus stores the pulse number of the pulse motor, calculates the coordinates of both end portions of the document based on the pulse number, and recognizes the range where the document exists as the coordinates. Based on these coordinates, the document reading portion 6 reads the contents of the document for the designated coordinate range.
Further, the time from when the original document is placed and the original document sensor 1 recognizes the presence of the original document to start the conveyance is t1, and the time until the original document conveyance is started and the original document sensor 1 disappears is t2.
Then, the apparatus recognizes the changing transportation time t (t = t1 + t2) from the presence of the original to the absence of the original, and calculates and recognizes the length of the original from the transportation time t, the unique transportation speed and the transportation distance. There is. Based on this length information, the document reading unit 6
Is reading for a specified time from the start of reading. Note that the document sensor 1 is arranged at regular intervals in the main scanning direction, and in the example of FIG. 3, every 210 mm in order to be able to read a document of A4 vertical size or larger, no matter where it is placed. It is located in.

[0012]

As described above, this makes it possible for the user to read an original anywhere in the original and the device can read the correct range of the original, regardless of the set state of the original. The original can be read correctly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a cross-sectional configuration of a main part of a document reading device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a planar configuration of a main part of the document reading apparatus according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a cross-sectional configuration of a main part of a document reading device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a planar configuration of a main part of an original reading device according to a second embodiment of the present invention.

[Explanation of symbols]

1 Original sensor 2 Conveyor rollers 3 pinch rollers 4 Document position reading sensor 5 Black part 6 manuscript reading part 7 White reflector 8 rails 9 Lower paper guide 10 Upper paper guide 11 manuscript

Claims (3)

[Claims] 1. An original reading device, which is mounted on a copying machine, a scanner or the like and reads an original while it is being conveyed, including an original sensor for detecting the presence or absence of the original being conveyed, and a conveying roller for conveying the original. Obtained from a document position reading sensor, which is movably held by rails provided in parallel directions and moves in the rail direction to read both end positions in the width direction of the document, and the document sensor and the document position reading sensor. An original reading device comprising: an original reading unit that recognizes original information regarding the original width, the original placement position, and the original size of the original and reads the original content. 2. The document reading device according to claim 1, wherein the document size in the transport direction is calculated from the time from the presence of the document detected by the document sensor to the absence thereof and the transport speed. . 3. The document reading device according to claim 1, wherein the document reading unit is controlled to perform a reading operation only while the content of the document passes through the unit.