JP2004101781A - Image scanner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a manuscript from moving by dividing a manuscript press member into two portions, providing the divided manuscript press members via a hinge member provided at both edges in a subscan direction while each can be closed and opened, and separately opening and closing the two divided manuscript press members. <P>SOLUTION: A platen 3 corresponding to an FBS function is provided on an apparatus body 2 having a reader 5 of an image reader 1 and the two manuscript press members for pressing the manuscript are provided while they can be opened and closed separately. Then, the manuscript set on the platen 3 is positioned by the manuscript press member 10 for pressing. After that, the other manuscript press member 20 is closed. As a result, the manuscript can be retained without moving and the movement of the manuscript caused by a wind pressure in the opening/closing is also prevented after the completion of scanning by successively opening the two manuscript press members. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading apparatus provided in an image forming apparatus, and in particular, divides a document pressing member, which is pressed onto a platen and holds a document, into two in a moving direction (sub-scanning direction) of a reading optical system. The present invention relates to an apparatus for preventing misalignment of a document.
[0002]
[Prior art]
2. Description of the Related Art In an image forming apparatus such as an electrophotographic copying machine, a facsimile machine, or a multifunction machine having a combination of the functions, an original is combined with an apparatus body that creates recording paper using an electrophotographic system or other printing means. An image reading device for reading an image is provided. The image reading apparatus uses an ADF (automatic document feeder) for reading while a sheet original is being conveyed, and a book original is set on a platen, and a scanning device is used. A combination of FBS (Flatbed Scanner), which reads while moving, is often used.
[0003]
In the FBS, a large platen is provided on which a document of a book is spread and set, and a scanning device is operated so as to read an image while moving a lower surface of the platen. When reading a sheet document using the FBS function, the document is set at a designated position on a platen corresponding to the size of the document, the document pressing member as an opening / closing member is closed, and the lower surface of the document pressing member is A document pressing means such as a provided platen cover or white platen presses the document from behind, so that the screen of the document is brought into close contact with the platen, and reading operation by the scanning device is performed.
[0004]
[Patent Document 1]
JP-A-6-324405 [Patent Document 2]
JP-A-8-129238
[Problems to be solved by the invention]
However, when reading the sheet document using the FBS function, if the document pressing member (platen cover) is closed after the sheet document is placed on the platen, the sheet is displaced due to the wind pressure caused by the closing operation. Problem. Also, when the document pressing member is opened, there is also a problem that the document comes in close contact with the pressing surface (white platen) of the document pressing member and floats, and the document is scattered. In order to prevent the movement of the sheet when closing the platen, a document holding member (pressing member) for pressing and holding a part of the sheet document can be rocked separately from the document pressing member. After the document is set, the pressing member is closed to position the document, the document pressing member is closed, the document is pressed against the platen, and then the reading device is operated. Sometimes. However, after the document is set, the pressing member is closed, the platen cover is closed in a state where the end of the document is positioned, and the two members are separately separated so that the operation of pressing the document uniformly by the platen cover is sequentially performed. In addition, the provision of the image reading device forcing the operator to perform an extra operation also causes problems such as complicating the configuration of the image reading apparatus.
[0006]
The present invention divides a document holding member into two parts, and provides the document holding member to be openable and closable via hinges provided at both ends in the sub-scanning direction. It is an object of the present invention to provide an image reading apparatus capable of preventing the original from moving by closing the original pressing member.
[0007]
[Means for Solving the Problems]
The present invention relates to an image reading apparatus, wherein the invention according to claim 1 is a scanner main body provided with a platen on which an original is placed, and is attached to one end of the scanner main body so as to be angularly displaceable, and on a platen in a closed state. A first document pressing member that presses a document, and a second document pressing member that is attached to the other end of the scanner body so as to be angularly displaceable and presses the document on the platen in a closed state; The two document pressing members are closed so as to cover the entire platen.
[0008]
The invention according to a second aspect is characterized in that the one document pressing member includes a reading unit corresponding to the ADF function and a document conveying unit on an upper portion thereof.
[0009]
According to a third aspect of the present invention, a reading optical system which is arranged below the platen and moves in the sub-scanning direction, an instruction means for instructing a start of the movement of the reading optical system, and an opening / closing of the first document pressing member is detected. A first opening / closing detection unit, a second opening / closing detection unit for detecting opening / closing of a second document pressing member, and a control unit for controlling movement of the reading optical system; When an instruction to start movement of the reading optical system is given in a state where only the member is closed, the control means stops the movement of the reading optical system at the other end of the first document pressing member. And
[0010]
According to a fourth aspect of the present invention, when the movement start instruction is given in a state where the first document pressing member and the second document pressing member are open, the control means moves the reading optical system to the end position. It is characterized by being moved.
[0011]
With the above-described configuration, the second document pressing member is closed in a state where the document set on the platen is pressed and held by the first document pressing member, so that the positioning of the document to be read can be performed accurately and easily. . Further, since the first document pressing member is provided with the ADF function, the same operability as that of the conventional image reading device can be exhibited, and the operation of the reading device can be performed based on the information that the opening and closing of the two document pressing members are detected. Since the control is performed, no error occurs in the reading operation. Furthermore, in a state where the two document pressing members are open, only the positioning of the reading device is performed, and no extra operation is performed. Therefore, it is possible to prevent a malfunction of the device.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The configuration of the image reading device will be described according to the illustrated example. 1 and 2, document holding members 10 and 20 are provided on the apparatus main body 2 of the image reading apparatus 1 so as to be openable and closable, and a document set on a platen 3 is pressed and held to perform reading. An example configured as a device is described. In the image reading apparatus 1, a platen 3 corresponding to the FBS function and a small platen 4 corresponding to the ADF function are arranged on the upper part of the apparatus main body 2, and reading is performed inside the main body using a driving unit (not shown). The device 5 is provided so as to be able to reciprocate at a constant speed. As the reading device 5, it is possible to use a conventionally known two carriage, and to use a mechanism for forming an image on a CCD by a lens provided at a fixed position and outputting an optical signal as a digital signal. In the example, an apparatus configured as one unit is used.
[0013]
The reading device 5 is provided with a lamp 6 for irradiating the original with light, a plurality of mirrors 7 are arranged, an optical path of light reflected on the original is set to a predetermined length, and the light is transmitted through a lens 8. To form an image on the CCD 9 and output an optical signal as a digital signal. A digital signal output from the reading device 5 can be used as information for creating a recording sheet in an image recording device or transmitted to another facsimile device using a facsimile function. Can be performed. When used as a reading device connected to a personal computer, it is also possible to transmit a document reading signal to the personal computer and use it as a signal for image processing.
[0014]
A first document pressing member 10 and a second document pressing member 20 are provided on the upper portion of the apparatus main body so as to be openable and closable via hinge members 12 and 22 disposed at both ends of the apparatus main body. With the two document pressing members closed, the entire upper surface of the platen 3 is covered. Of the two document pressing members, one of the first document pressing members 10 is provided with a document transport device 17 corresponding to the ADF function on the upper portion thereof, and a transport path and transport means provided corresponding to the small platen 4. The document set on the document tray 18 is read while being transported through the document transport path, and is discharged to the discharge tray 19. In the second document pressing member 20 combined with the first document pressing member 10, only a mechanism for simply pressing and holding the document is provided.
[0015]
A frame 11 having an upper surface of the first document pressing member 10 as a discharge tray 19 has a handle 14 at a free end thereof at a position corresponding to a substantially central portion of a normal integrally formed platen. Is provided to correspond to the opening and closing operation. A step 13 is provided at the free end of the frame 11, and when combined with the step 23 of the second document pressing member 20, light is shielded so that light from the connection does not reach the back of the document. are doing. Further, a white platen 16 is provided on the lower surface of the frame 11 via an elastic body 15 such as a sponge, and the white platen 16 is an extension 16a formed to be longer than the frame 11.
[0016]
A second document pressing member 20 that presses and holds a document in combination with the first document pressing member 10 is provided to be openable and closable via a hinge member 22 provided at the other end of the apparatus main body. A step corresponding to the end of the first document pressing member 10 is provided at the free end. When the second document pressing member 20 is closed, the extension 16a of the white platen 16 provided on the first document pressing member 10 is located in the notch 26a of the white platen 26, and the pressing action of the document is performed. To be able to show good performance. In the step portion 13 as a combination portion of the document pressing member, the shape of the step portion provided on the frame, the length of the long and short portions of the white platen, and the like can be performed in a state where the document pressing and holding action is good, The shape can be arbitrarily formed if light can be prevented from entering from the back of the document.
[0017]
As described above, when a document is set on the platen 3 by using two document pressing members that are separately angularly displaceable (openable and closable), the first document pressing member 10 is first closed and the document is set. One end is pressed and held. Then, by closing the other second document pressing member 20, the whole of the document is pressed and held from the back, and the reading operation by the reading device 5 is handled. When taking out the scanned original from the platen 3, first, the second original pressing member 20 is opened to open the end of the original, the free original is pressed by hand, and the other first original is pressed. The holding member 10 may be opened. Accordingly, as described above, by sequentially opening and closing the two document pressing members, the document is not moved by the wind pressure when the document pressing member is opened and closed, and the operation of setting and removing the document can be easily performed. It becomes possible.
[0018]
In the image reading apparatus 1, sensors SW1 and SW2 are provided at positions close to the hinge members 12 and 22, respectively, for detecting opening and closing of the two document pressing members 10 and 20. Paper size detecting means for detecting the size of the original set in the printer. As the paper size detecting means, a light reflection type sensor or the like can be arranged on the lower surface of the platen 3 according to a predetermined arrangement pattern to detect the length of the document, as in the case of the conventional apparatus. It is. Further, in order to detect the width of the document, the information of the sensor is used, or the reading device is moved at a predetermined distance at the start of scanning to process information of an obtained image to read the width of the document. , Any detection means can be used.
[0019]
In the image reading apparatus 1, when at least the second document pressing member 20 is closed, as in the case of the conventional image reading apparatus, when a reading signal is input, the document width is firstly detected by a CCD (line sensor). Is detected, the length of the original is detected by another reflection type sensor or the like, and the original size is specified. That is, when it is detected from the detection signal from the sensor SW2 that the second document pressing member 20 is closed, the operation of detecting the size of the document on the platen 3 is performed, and based on the detection result, the size of the document is determined. The moving range of the reading device 5 at the time of image scanning can be specified. In the apparatus provided with the two document pressing members, it is assumed that when the second document pressing member 20 is closed, the first document pressing member 10 is naturally closed.
[0020]
Further, when the two document pressing members are closed, the steps formed at the free side ends of the respective frames are combined, and light is blocked so that light does not enter from gaps. In this state, the document detecting means is operated, and the reading device 5 is moved to read an image of the document in accordance with the detected size information of the document, and the image information is transmitted from the reading device 5. Then, the reading device 5 is returned to the standby position and one reading is completed, and a display indicating the end of scanning of the document is output to the display unit of the control panel. In the apparatus in which the two document pressing members are combined, as shown in the drawing, the end of the frame of the document pressing member is configured as a step portion, and the white platen of one document pressing member is formed to be long, The light is prevented from entering the original by means of connecting to the short portion of the other white platen. Instead of providing the step portion or the extension portion of the white platen, for example, if the extension portion of the white platen can exhibit good light-shielding properties, it is not necessary to provide a step portion on the frame. In any case, if any light-shielding means can be used, the step does not have to be provided at the end of the frame.
[0021]
When reading an original in the image reading apparatus, it is possible to set a control program in the control apparatus so as to control the operation of the apparatus in accordance with the flowchart of FIG. 3 described below. In the flowchart of FIG. 3, when the main switch of the image reading apparatus is turned on, the comment "Please set original"... (1) is displayed on the display section of the control panel. Then, in step a-1, when the start button is pressed after the original is set (step a-2), the following operations are controlled according to the program set in the control device. First, in step a-3, it is determined whether or not the second document pressing member 20 has been closed based on the information of the sensor SW2. If YES, the process proceeds to steps after a-4. In the case of NO in step a-3, the operation is performed according to the flowchart of FIG.
[0022]
If YES in the step a-3 (the state in which the second document pressing member 20 is closed), the process proceeds to a-4, where it is determined whether or not the first document pressing member 10 is closed by the sensor SW1. Judge based on information. If the first document pressing member 10 is closed in step a-4, it is determined in step a-5 whether there is a document, and the process proceeds to steps a-6 and below. In step a-4. If it is determined that the first document pressing member 10 is not closed (NO), the process proceeds to step b-1.
[0023]
In the state where the original is set in step a-5 and the two original pressing members are closed, the operation of detecting the original size (a-6) is performed, and the reading device is moved to the distance corresponding to the original size. The scanner is moved to read (a-7), and when it is detected in step a-8 that the scanning has been completed, the reading device is returned to the start position, the operation ends (step a-9), and the reading ends. The display is output, and the process returns to step a-1. If the information that the first document pressing member 10 is not closed is obtained in the step a-4, a message "Please close the first document pressing member" is output. Then, when the operator closes the first document pressing member 10, the process proceeds to step b-1, and in step b-1, the presence or absence of a document is detected. In step -3, the completion of the reading is detected, and the operation is terminated.
[0024]
When it is detected in step a-3 in FIG. 3 that the second document pressing member 20 is not closed, the process proceeds to step c-1 in FIG. 4 to check whether the first document pressing member 10 is closed. Determine whether or not. In the step c-1, if the first document pressing member 10 is not closed (NO), the display of "Please close the first document pressing member" .... Go to step 1. When the sensor SW1 outputs a signal indicating that the first document pressing member is closed in step c-1, the size of the document is reduced according to steps c-2 to c-5. Upon detection, an operation of scanning the original while moving the reading device 5 according to the size is performed, and an operation of outputting read information from the reading device is performed. In the control operation, in steps b-1 to b-4, it is also possible to read the original even when only the second original pressing member 20 is closed.
[0025]
In the case where a book original is set on the platen in the image reading apparatus 1, even if none of the original pressing members is closed in the steps a-3 to c-1 in FIG. It is possible to move and scan the device. For example, the program can be set so that scanning can be performed by an operation such as pressing the start switch again even when the two document pressing members are open. Further, it is preferable to provide an arbitrary operation command means such as providing an input means for operating the reading apparatus as it is even when the display of (2) is performed on the display unit.
[0026]
In addition to the above-described configuration, in the apparatus of the present embodiment, the shape of the stepped portion can be arbitrarily configured as long as the structure of the joining portion of the two document pressing members can prevent light from entering the document. . Further, the length and the like of the protruding portion 16a of the white platen 16 provided on the first document pressing member 10 can be formed to an arbitrary length in accordance with the light shielding state of the frame. It is not necessary to particularly form the projection of the white platen. Further, as the hinge member for supporting the two document pressing members on the main body frame, a conventionally known hinge member mechanism can be used.
[0027]
When the ADF 17 provided on the first document pressing member 10 is used, as in the case of the conventional ADF, a document of a sheet is set on the document tray 18 and a copy start button is pressed. Originals of sheets are taken out of the original tray one by one and conveyed. Then, the reading is performed by the reading device 5 stopped at the position of the small platen 4 during the conveyance using the document conveyance mechanism of the ADF. Therefore, since reading is performed according to a separate control program from the case where the FBS function is used, reading control similar to that of a conventional image reading apparatus can be performed.
[0028]
【The invention's effect】
With the configuration described above, the second document pressing member is closed while the document set on the platen is pressed and held by the first document pressing member, so that the position of the document to be read can be accurately and easily performed. . Further, since the first document pressing member is provided with the ADF function, the same operability as that of the conventional image reading device can be exhibited, and the operation of the reading device can be performed based on the information that the opening and closing of the two document pressing members are detected. Since the control is performed, no error occurs in the reading operation. Furthermore, in a state where the two document pressing members are open, only the positioning of the reading device is performed, and no extra operation is performed, so that malfunction of the device can be avoided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a configuration of an image reading device.
FIG. 2 is an explanatory diagram of a configuration of a reading device and a first document pressing member.
FIG. 3 is a flowchart showing a control operation.
FIG. 4 is an explanatory diagram of a flowchart following FIG. 3;
[Explanation of symbols]
1 image reading device, 2 main unit, 3.4 platen,
5 reading device, 10 first document pressing member, 11 frame,
12 hinge member, 13 step, 14 handle,
15 elastic body, 16.26 white platen, 17 ADF,
18 document tray, 19 discharge tray,
20 Second document pressing member.

Claims (4)

A scanner body provided with a platen on which a document is placed, a first document pressing member attached to one end of the scanner body so as to be angularly displaceable, and pressing the document on the platen in a closed state;
A second document pressing member attached to the other end of the scanner main body so as to be angularly displaceable and pressing a document on a platen in a closed state;
An image reading apparatus, wherein the two document pressing members are closed so as to cover the entire platen. 2. The image reading apparatus according to claim 1, wherein the one document pressing member includes a reading unit corresponding to an ADF function and a document conveying unit on an upper portion thereof. A reading optical system that is arranged below the platen and moves in the sub-scanning direction;
Instruction means for instructing the start of movement of the reading optical system;
First opening / closing detecting means for detecting opening / closing of the first document pressing member;
Second opening / closing detecting means for detecting opening / closing of the second document pressing member;
Control means for controlling the movement of the reading optical system,
When an instruction to start the movement of the reading optical system is issued in a state where only the first document pressing member is closed, the control means moves the reading optical system at the other end of the first document pressing member. The image reading device according to claim 1, wherein the image reading device is stopped. The control means moves the reading optical system to the end position when an instruction to start movement is given in a state where the first document pressing member and the second document pressing member are open. The image reading device according to claim 1.

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