JPH05323729A - Document reader - Google Patents

Abstract

PURPOSE:To detect size of a document in a document feeding direction by a document reading part when the document reading part is moved in a transferring document reading position. CONSTITUTION:When judgement of mode as reading the transferring document is made by the document placing, the document reading mechanism part 14 is moved to the transferring document reading position 14c. At a position of 14b in the middle of the move, judgement is made of the existence of the transferring document over a through hole 12 for detecting document length disposed on a document platen 11. In accordance with this judgement and result of detecting width direction of the document, obtained separately, the size of the document is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a facsimile machine, a copying machine or the like, and mainly has a stationary original reading function for reading an original placed on a platen such as a book and a transfer for reading a sheet-like transferred original. The present invention relates to a document reading device having a document reading function for both a document reading function and a document reading device having a document size detecting function for automatically detecting a document size of a sheet-like document in the case of reading a transfer document.

[0002]

2. Description of the Related Art In a facsimile machine for reading a sheet-like document and transmitting the image information thereof, and a copying machine for copying the image information, the size of the document is designated as a facsimile destination or the size of the document is adjusted. Conventionally, a device for detecting the size of a document is provided for selecting a sheet or the like.

For example, in a facsimile document width detection mechanism disclosed in Japanese Utility Model Laid-Open No. 1-88653, an operating projection is integrally provided on one slidable guide that regulates the position of the document in the width direction. The size of the document is determined by detecting the length of the document in the width direction by operating a detection switch provided in the vicinity of each movement setting position in this guide.

Further, the document size detecting device disclosed in Japanese Utility Model Laid-Open No. 63-99461 discloses a document size detecting device for each standard size document.
An actuator that operates with a document of that size is provided, and the length of the document in the width direction is detected to determine the document size.

Further, the document size detecting means disclosed in Japanese Patent Laid-Open No. 62-49344 is provided with a plurality of sensors for detecting the size of the document in the width direction and the longitudinal direction, and the size of the document is determined based on the outputs of the sensors. While detecting the document size, the document size is detected based on the document feed distance when the document is fed, and if the detected sizes do not match, the size is determined based on one of them.

[Problems to be Solved by the Invention]

However, the facsimile document width detection mechanism disclosed in Japanese Utility Model Laid-Open No. 1-88653 cannot detect the document size in the document feeding direction, and the detection mechanism in the document width direction also applies to the document feeding direction. However, even if it is used for the above, there is a problem that since the movement amount of the guide is large, the structure of the mechanism portion becomes large and the cost becomes high, and the operator is burdened with the movement of the guide.

Further, the document size detecting device disclosed in Japanese Utility Model Laid-Open No. 63-99461 cannot detect the document size in the document feeding direction in the same manner.

Further, in the document size detecting means disclosed in Japanese Patent Laid-Open No. 62-49344, it is necessary to dispose the sensors not only in the width direction of the document but also in the document feeding direction, which increases the cost. There is a problem such as.

Therefore, an object of the present invention is to provide an original reading device having a simple structure and capable of detecting not only the width of the original but also the size in the feeding direction of the original without increasing the cost. It is in.

[Means for Solving the Problems]

In order to solve the above-mentioned problems and to achieve the object, the document reading apparatus of the present invention includes an apparatus main body, a platen provided on the main body, and a document mounting table provided on the platen so as to be openable and closable. An original guide for positioning the original placed on the original placing table, a transfer means for transferring the original placed on the original placing table, a first position and a second position provided on the main body. An original reading unit that moves between a first position and a second position; and a transfer original reading position that is provided between the first position and the second position.
And a second position, the stationary document placed on the platen is read, and the document transported by the transport means is scanned at the transport document reading position. In the document reading device, the length in the width direction is determined by providing a required number of sensors for detecting the length in the width direction of the transported document, and the length in the transport direction of the transported document is set on the document table. Is provided, and the size of the transported document is determined by determining the length in the transport direction by detecting the state of the document on the through hole in the document reading unit. The first characteristic is that

Further, the document reading apparatus of the present invention includes a main body of the apparatus, a platen provided on the main body, a document mounting table provided to be openable and closable with respect to the platen, and a document mounting table mounted on the document mounting table. An original guide for positioning the original, and a transfer means for transferring the original placed on the original table,
An original reading unit that is provided in the main body and that moves between a first position and a second position; and a transfer original reading position that is provided between the first position and the second position, The original reading unit moves between the first position and the second position to read a static original placed on the platen, and the original transferred by the transfer unit is transferred to the transfer original. In a document reading device configured to read at a reading position, a through hole for detecting the length in the width direction of a transfer document and a through hole for detecting the length in the transfer direction are formed in the document table. The size of the transported document is determined by detecting the state of the document on each of the through holes in the document reading unit and determining the width and the length in the transport direction. There are two characteristics.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are explanatory views showing the schematic structure of the document reading apparatus in this embodiment. As shown in FIG. 1, this document reading apparatus is provided with a document placing table 11 on which a sheet-like transporting document is placed when reading a transporting document, and a document length detecting device which is vacant on the document placing table 11. Through hole 12
And a position such that the two are united by a mechanism such as a rack and pinion 23 at a position facing each other in the width direction of the document and slides on the document mounting table 11 to determine the position in the document width direction and guide the feeding of the sheet document. Document guide 13 for reading, a lamp 41, a mirror 42, and a condenser lens 4 for reading a document.
3, an original reading mechanism section 14 including a CCD 44 and the like, and an original IN sensor 21 including a reflection type photo sensor and a micro switch for detecting that a sheet-like original is placed.
A document width sensor 20a, 20b, 20c for detecting the document size in the width direction of the document, a document transport unit 17 for transporting the sheet document, and a discharge tray 22 for placing the read sheet document. There is. In the present embodiment, the document placing table 11 is integrated with a platen cover that fixes the stationary document when the stationary document is read while the document is stationary.

Further, as shown in FIG. 2, in addition to the one described with reference to FIG. 1, this document reading apparatus is provided with a platen glass 16 on which a stationary document is placed, and a sheet-shaped document which is located in a document conveying section 17. From a document conveyance guide 18 that is nipped and conveyed by rollers, a sheet platen glass 19 provided at a position for reading a sheet document, and a motor, a belt, a roller, etc. (not shown) that drives the document reading mechanism unit 14. And a drive unit 15 that is

Next, the operation of the sheet document size detection of the document reading apparatus in this embodiment will be described with reference to FIGS. 1, 2, 5, and 6.

First, a document is placed on the document table 11 while adjusting the document guide 13. When the document IN sensor 21 detects that the document is placed, the document reading mechanism unit 14 starts to move by the movement of the driving unit 15. Here, the document reading mechanism unit 14 starts reading a still document from the position of 14a in FIG. 2, and has a home position (standby state) as 14a. The document reading mechanism unit 14 starts moving from the position of 14a in the direction of 14b of FIG. Simultaneously with the start of this movement, the lamp 41 in the document reading mechanism 14 is also turned on.

Next, the document reading mechanism 14 moves to the position 14b, starts reading, and reads the state of the position of the through hole 12 for detecting the document length. At this time, when the sheet original is above the hole 12, the reading shows a value close to the white level, and when the sheet original is not above the hole 12, the reading shows a black level value. After the reading of the hole 12 is completed, the document reading mechanism section 14 further moves from 14b to 14b.
In order to read the sheet-like original by moving in the direction of c, the apparatus stands still at the reading position 14c of the original feeding type and prepares for reading image information and the like.

On the other hand, the document width direction is detected by the document IN sensor 21 detecting the placement of the document and the state of the document width direction sensors 20a, 20b, 20c.

5 and 6, depending on the state of the through hole 12 for detecting the original length detected by the original reading mechanism section 14 and the states of the original width direction sensors 20a, 20b and 20c.
6A and 6B are an explanatory diagram and a table for determining the size of the sheet document.

The document width direction sensor 20 in this embodiment
As shown in FIG. 5, a, 20b, and 20c are standard sizes of A4 size long (about 297 mm), B5 size long (about 257 mm), and A5 size long (about 210).
mm) are arranged at positions where they can be distinguished. Further, as shown in FIG. 5, the document length detection hole 12 is located at a position from the right end to a length of A4 size (about 210 mm) or more and a length of A4 size (about 297 mm) or less.

Here, the sensor state of the through hole 12 for detecting the document length detected by the document reading mechanism section 14 shows a black level when there is no document and a white level when there is a document. On the other hand, the document width direction sensors 20a, 20b, 2
0c is turned on when the document is placed,
The sensor state of the hole 12 and the document width direction sensor 20a,
As shown in FIG. 6, depending on the states of 20b and 20c, it is possible to obtain at least 6 types of output for the placed sheet originals. A5 horizontal, B5 horizontal, A4 horizontal, A4 vertical,
It is possible to detect the document size of B4 length and A3 length.
The document width direction sensor 20c is always ON and does not affect the six types of output, but when a document smaller than the length of A5 size (about 210 mm), for example, a postcard size document is placed. In addition, it is possible to obtain an output indicating that the placement is smaller than the A5 horizontal size.

Further, the document width direction sensor 20 of the present embodiment.
The a, 20b, and 20c can be substituted by the configuration shown in FIGS. FIG. 3 shows the size of each size detected by operating the limit switch in conjunction with the position of movement of the document guide 13, and FIG. It is operated to detect the document size.

As described above, according to this embodiment, the size of the document that can be recognized by the detection in the document length direction is increased, but it is not necessary to provide a special sensor or the like for the size detection in the document length direction. The detection can be performed with a simple configuration, and the cost can be reduced.

Next, a second embodiment will be described. FIG. 7 shows the document width direction sensors 20a and 20 shown in FIG.
Instead of providing b and 20c, a hole 30 for detecting the document width is provided.
a, 30b, 30c are provided, the document reading mechanism section 14 is moved to the document width detecting holes 30a to 30c, and the size in the document width direction is read using a sensor for reading image information.

Until the original reading mechanism 14 reads the state of the through-hole 12 for detecting the original length, it is the same as in the first embodiment, but after the state of the hole 12 for detecting the original length is read. The document reading mechanism unit 14 moves to the position 14d in FIG. 2 by the movement of the driving unit 15. At that position, the document reading mechanism section 14 has the through hole 3 for detecting the document width in FIG.
The states of 0a, 30b, and 30c are read. The state of the through-holes 30a, 30b, 30c for detecting the document width is similar to the state of the through-hole 12 for detecting the document length, and shows a value close to the white level when the document is above the hole, Indicates the black level value when not over the hole. If the white level / black level of the through holes 30a, 30b, 30c for detecting the document width is used instead of turning on / off the sensors 20a, 20b, 20c in the table of FIG. A5 horizontal, B5 horizontal, A4 horizontal, A
It is possible to detect the document size of 4 vertical, B4 vertical, and A3 vertical.

According to the present embodiment, not only the sensor for detecting the length direction of the document can be eliminated, but also the sensor for detecting the width direction of the document can be eliminated. No sensor is needed,
It is more effective due to cost reduction.

Next, a third embodiment will be described. 8A and 8B, a plurality of through holes for detecting the original length are provided at the detection positions in the original length direction like 31a and 31b, and the through holes 30a, 30b and 30 for detecting the original width are provided.
Through holes 30d, 30e, and 30f for detecting the document width are further provided at positions substantially on the center line of c and the paper.

If either of the through-holes 31a and 31b for detecting the document length detects the white level, it is judged as the white level in FIG. 6, and if none of them detects the white level, it is judged as the black level. A determination is made to determine the document size based on FIG. On the other hand, regarding size detection in the document width direction, 30a and 30f, 30b and 30e, 30c and 30
The size is detected at multiple detection locations corresponding to d,
When either one detects a white level, it is recognized as a white level, that is, ON in FIG. 6, and when neither detects a white level, it is recognized as a black level, that is, OFF in FIG. I do.

According to the present embodiment, since the document size is detected at a plurality of detection locations for the same state, it is possible to prevent erroneous detection when black information happens to be present at the document detection location, and to detect the document size. Has the effect of increasing the reliability of. In this embodiment, both the original length detection and the original width detection are detected at a plurality of locations.
It goes without saying that one of the detections may be detected at a plurality of locations.

Next, a fourth embodiment will be described. The present embodiment is characterized in that a document length detecting long hole 32 and a document width detecting through long hole 33 in FIG. 9 are provided so that the document reading mechanism section 14 can read a sheet-like document.
Here, the manuscript length detecting long hole 32 and the manuscript width detecting through long hole 33 are, for example, in addition to the size of A3 to B5, a postcard size, a size of a manuscript to be detected such as a legal or letter size in the United States. It is arbitrarily vacated by.

Next, the operation of this embodiment will be described.
When the document IN sensor 21 detects that the document is placed, the document reading mechanism unit 14 starts moving from the position of the home position 14a shown in FIG. 2 by the movement of the driving unit 15. At that time, the lamp of the document reading mechanism unit 14 is turned on. When the image information reading portion of the document reading mechanism section 14 moves to the position of 32a which is one end of the document length detecting through slot 32, the reading of the slot portion of the document length detecting through slot 32 is started. , 32b depending on the movement of the driving unit 15 as it is
The reading is completed by moving to the position. In this case, the output of the document reading mechanism section 14 indicates a black level for a portion where the document is not placed, and a value close to a white level for a portion where the document is present. Therefore, the point where the output of the document reading mechanism section 14 changes from the black level to the white level is one end of the placed document. This document reading mechanism section 1
It is possible to detect the size of the document placed on the document table 11 in the lengthwise direction based on the relationship between the output of 4 and the moving position of the document reading mechanism unit 14. Next, the document reading mechanism unit 14 is driven by the drive unit 1.
The movement further moves by the movement of 5, and the reading in the direction of the document width detecting through-hole 33 is performed at the position of the document width detecting through-hole 33. Similar to the detection in the document length direction, the output of the document reading mechanism section 14 shows a black level for a part where no document is placed, and a value close to a white level for a part of the document. Therefore, the point where the output of the document reading mechanism section 14 changes from the black level to the white level (the white level to the black level depending on the reading direction) can be recognized as one end of the document placed in the width direction of the similarly placed document. The size of the document is determined by the detection results of the document length detecting slot 32 and the document width detecting through slot 33.

As described above, according to the present embodiment, a special sensor is not required for detecting the size of the document, the cost can be reduced, and the size of the sheet-shaped document other than the standard size can be detected by the simple structure. It will be possible.

The lamp 4 in the above-described embodiments is used.
The document reading mechanism 14 including the mirror 1, the mirror 42, the condenser lens 43, and the CCD 44 may be a contact image sensor, or may be a mechanism that simply moves the mirror and is fixed to the machine such as a CCD. Alternatively, the image information and the document size may be read.

[0034]

As described above, according to the present invention, the original reading mechanism for reading image information detects the original size of the sheet original placed as the original feeding type. This has the effect of reducing the number of sensors for detecting the document size or omitting the sensors.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a document reading apparatus according to a first embodiment of the present invention.

FIG. 2 is a central sectional view of a document reading device showing a configuration of a document reading device according to first, second, third, and fourth embodiments.

FIG. 3 is a perspective view showing another application example of the first embodiment.

FIG. 4 is a perspective view showing another application example of the first embodiment.

FIG. 5 is an explanatory diagram showing a relationship between a document and a sensor output in the first, second, third, and third embodiments.

FIG. 6 is a table showing a relationship between a document and a sensor output in the first, second, third, and example embodiments.

FIG. 7 is a diagram showing a configuration of a document reading device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a document reading device according to a third embodiment of the invention.

FIG. 9 is a diagram showing a configuration of a document reading device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 11 Document Placement Table 12 Through Hole for Detecting Original Length 14 Original Reading Mechanism Parts 20a, 20b, 20c Original Width Sensors 30a, 30b, 30c Through Hole for Detecting Original Width 32 Through Long Hole for Detecting Original Length 33 For Detecting Original Width Through slot

Front page continued (72) Inventor Hajime Hajime 3-7-1, Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Plant (72) Inventor Akira Ishiguchi 3-7-1, Fuchu, Iwatsuki City, Saitama Prefecture Co., Ltd. Iwatsuki Plant (72) Inventor Tetsuro Maeda 3-7-1, Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Plant (72) Inventor Akito Yamauchi 3-7-1, Iwatsuki City, Saitama Prefecture No. Fuji Xerox Co., Ltd. Iwatsuki Works (72) Inventor Hiroshi Kawamoto 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Works

Claims (2)

[Claims] 1. An apparatus main body, a platen provided on the main body, an original placing table provided on the platen so as to be openable and closable, and an original guide for positioning an original placed on the original placing table. A transfer means for transferring an original placed on the original placing table, an original reading unit provided on the main body for moving between a first position and a second position, the first position and the first position A moving document reading position provided between the platen and the second position, and the document reading unit moves between the first position and the second position to stop the document placed on the platen. In a document reading device configured to read a document and to read a document transported by the transporting device at the transport document reading position, a required number of sensors for detecting the length of the transport document in the width direction are provided. Determine the length in the width direction by providing At the same time, a through hole for detecting the length of the transfer original in the transfer direction is provided in the original placing table, and the length in the transfer direction is detected by detecting the state of the original on the through hole in the original reading unit. A document reading device configured to determine the size of a transported document by making a determination. 2. An apparatus main body, a platen provided on the main body, an original placing table provided to be openable and closable with respect to the platen, and an original guide for positioning an original placed on the original placing table. A transfer means for transferring an original placed on the original placing table, an original reading unit provided on the main body for moving between a first position and a second position, the first position and the first position A moving document reading position provided between the platen and the second position, and the document reading unit moves between the first position and the second position to stop the document placed on the platen. In a document reading device configured to read a document and to read a document transferred by the transfer means at the transfer document reading position, to detect the length in the width direction of the transfer document on the document table. To detect the through-hole and the length in the transfer direction The through-holes are provided, and the size of the transported document is determined by detecting the state of the document on each through-hole in the document reading unit and determining the width and the length in the transport direction. A document reading device characterized in that