JP2016138912A - Image reading device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device that can detect open/closed positions of various combinations of a lid member composed of a platen cover and a lid member including an automatic document feeder, the lid members including hinges not common to each other, with one lever and two photosensors.SOLUTION: There is provided an image reading device 30 including a lever 51 provided insertably/withdrawably in an image reading device body part 32, and pushes in the lever 51 with a first lid member 40 or a second lid member including an automatic document feeder 41 to detect at least two open/closed positions in an opening/closing operation according to the height of the pushed-in lever 51, where an adjustment member 52 adjusting the height of the pushed-in lever 51 is provided respectively on the first lid member 40 and the second lid member.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image reading apparatus used for reading an image and an image forming apparatus provided with such an image reading apparatus. In particular, the image reading apparatus main body has a lever which is provided so as to be retractable. The lever is pushed into the image reading apparatus main body by a lid member, and at least two of the opening / closing operations are performed depending on the height of the pushed lever. An image reading apparatus that detects two or more open / close positions is characterized in that at least two or more open / close positions can be appropriately detected by one lever even when different types of lid members are mounted. Is.

  When reading an image on a document in an image forming apparatus such as a scanner or a copying machine, the document is placed on a document placement table, and the document is a lid member made up of a platen cover or a lid member equipped with an automatic document feeder. , While moving the scanning optical system and the light receiving unit in the sub-scanning direction from the lower surface of the document placing table, the exposure light source for reading the document is turned on to irradiate the document, and the reflected light is received by the light receiving unit. Read with.

  Also, scanners and copiers are equipped with functions such as automatically detecting the size of the document placed on the document table and automatically selecting the output image size and output paper based on the detection result. There is.

  As an apparatus for detecting such a document size, there is a device that uses a light receiving unit for reading a document. When detecting a document size using a light receiving unit for reading a document, the document is placed on the document table, and an exposure light source for reading the document is turned on from the lower surface of the document table to face the document. Irradiated, the reflected light is read by the light receiving unit, the edge of the document is detected, and the size of the document is detected.

  In addition, since the document is read and the size is detected by pressing the document with the cover member, the document and the cover member can be distinguished so that the color and density of the cover member do not appear in the output image or the document edge can be detected. It is required to be able to do so. For this reason, the cover member is provided with a white document mat on the side facing the document table.

  In order to increase the accuracy of detecting the document size, the background is substantially detected by detecting the size when the cover member is closed and when the background is white, and when the cover member is not completely closed, for example, half open. For example, the size is detected as black, and the document size is specified based on both detection results.

  Conventionally, an open / close sensor composed of a lever and a photosensor detects that a lid member provided with an automatic document feeder is in a half-open state, and the lid member provided with an automatic document feeder is in a completely closed state. This is detected by a magnetic sensor composed of a magnet and a reed switch (see, for example, Patent Document 1).

  However, since the magnetic sensor is expensive, a device that detects two open / close positions with one lever and two photosensors can be considered. In this configuration, a lever is provided in the main body of the image reading apparatus on which the document placement table is provided so that the lever is pushed down when the lid member is closed, and the position of the half-open state is detected by one photo sensor. When closing the lid member, the lever is further pushed down, and the position of this closed state is detected by another photo sensor, so that two open / close positions are detected by one lever and two photo sensors. can do.

  By the way, a lid member composed of a platen cover and a lid member provided with an automatic document feeder are attached to the body of the document reading device through hinges so that they can be opened and closed. When each lid member is opened, it should be closed by its own weight. A coil spring or the like is incorporated so that the force can be canceled and held at a predetermined angle.

  The lid member provided with the automatic document feeder is heavier than a lid member made of a platen cover. For this reason, the hinge for attaching the lid member provided with the automatic document feeder to the document table so as to be opened and closed is often larger than the hinge for attaching the lid member made of a platen cover. As a result, the rotation center of the hinge is often different between the lid member provided with the automatic document feeder and the lid member formed of the platen cover.

JP 2005-195785 A

  When a device that detects two open / close positions with one lever and two photosensors is configured, if the rotation center of the hinge is different, the height at which the lever is pushed in accordance with the open / close position will be different. As a result, the position of the photo sensor set when pushing the lever with the lid member consisting of the platen cover is different from the position of the photo sensor set when pushing the lever with the lid member equipped with the automatic document feeder. There was a problem that could not be shared.

  Here, if a common hinge used for the lid member provided with the automatic document feeder and the lid member made of the platen cover is used, the rotation centers of the hinges coincide with each other, and the above problem does not occur. However, there is a drawback in that a lid member including a lid member provided with an automatic document feeder that can be used and a platen cover is limited.

  The present invention can detect the open / closed position with one lever and two photosensors even when the hinge member is not common in various combinations of a lid member including an automatic document feeder and a lid member including a platen cover. An object of the present invention is to provide an image reading apparatus.

  In the image reading apparatus of the present invention, in order to solve the above-described problem, the image reading apparatus has a lever that is provided in the image reading apparatus main body, and the lever is pushed into the image reading apparatus main body by a lid member. In an image reading apparatus that detects at least two open / close positions of an open / close operation according to the height of the pressed lever, an adjustment member that adjusts the height of the pressed lever is used to detect the open / close position. The lid member was provided.

  Here, in the image reading apparatus, the lid member includes a first lid member to which a first hinge is attached and a second lid member to which a second hinge is attached. When either the first lid member or the second lid member can be selected and attached to the main body of the image reading apparatus, the first hinge and the second hinge have different rotation centers. A first lever position for detecting a first opening / closing position of the first lid member and a first lever position for detecting a first opening / closing position of the second lid member. A second lever position for detecting a second opening / closing position of the first lid member and a second lever position of the second lid member are made to coincide with each other by the adjustment member of the member and the adjustment member of the second lid member. A second lever position for detecting an open / close position; The adjustment member of the lid member and the adjustment member of the second lid member are made to coincide with each other.

  Here, the adjustment member of the first lid member is formed so that a surface in contact with the lever is parallel to the upper surface of the image device main body at the first lever position for detecting opening and closing, Even at the second lever position, it is preferable that the surface in contact with the lever is formed so as to be parallel to the upper surface of the image device main body.

  Moreover, it is preferable that the front-end | tip part of the said lever contact | abutted with the said adjustment member has an arc-shaped curvature.

  Further, when the automatic document feeder is provided on the first lid member, the distance from the upper surface of the image device main body to the rotation center of the hinge is set to be greater than that of the second hinge of the second lid member. The first hinge of the lid member is large.

  In the image forming apparatus of the present invention, the image reading apparatus as described above is used as an image reading apparatus for reading an image.

  According to the present invention, by providing the adjustment member on the lid member, in order to detect at least two open / close positions in the open / close operation, the height of the pushed lever is matched even if the lid member changes. Even if the rotation center of the hinge changes, it can be detected at the optimum position.

1 is a perspective view showing an overall configuration of an image forming apparatus according to an embodiment of the present invention, to which a first lid member provided with an automatic document feeder is attached. It is a perspective view showing the whole composition of the image forming device of the embodiment of the present invention which attached the 2nd lid member which consists of a platen cover. FIG. 3 is a top view of the image forming apparatus according to the embodiment of the present invention with the first lid member and the second lid member removed. FIGS. 2A and 2B are explanatory views showing the image reading apparatus viewed from the direction of an arrow L in FIG. 1, in which FIG. 1A shows a state of a first opening / closing position where a first lid member is half-opened, and FIG. The state of the 2nd opening-closing position which closed the member is shown. It is explanatory drawing which expanded the principal part of Fig.4 (a), (b). FIGS. 3A and 3B are explanatory views showing the image reading apparatus viewed from the direction of an arrow L in FIG. 2, in which FIG. 2A shows a state of a first opening / closing position where a second lid member is half-opened, and FIG. The state of the 2nd opening-closing position which closed the member is shown. It is explanatory drawing which expanded the principal part of Fig.6 (a), (b). 1 is a block diagram illustrating a configuration for detecting a document size in an image forming apparatus according to an embodiment of the present invention. FIG.

  An image reading apparatus according to an embodiment of the present invention and an image forming apparatus using the same will be described in detail with reference to the drawings. Note that the image reading apparatus according to the present invention and the image forming apparatus using the image reading apparatus are not limited to those shown in the following embodiments, and can be appropriately modified and implemented without departing from the scope of the invention.

  First, an example of an image forming apparatus using an image reading apparatus according to an embodiment of the present invention will be described with reference to the drawings. The present embodiment is an example in which the image reading apparatus is applied to a digital multifunction peripheral.

  The image forming apparatus 10 is functionally roughly provided with a document reading portion and an image forming portion. These functions are used under appropriate control to realize various functions such as a FAX function, a copy function, a scan function, and a print function.

  In the image forming apparatus 10, an image reading device 30 that performs an image reading function is disposed above the image forming unit 20 that performs an image forming function.

  An image forming unit that forms an image, that is, forms an image on a sheet, is provided inside the image forming unit 20. The image forming unit 20 has a configuration in which an image forming unit is disposed above at least one paper feed cassette 22. Then, after the paper stored in the paper feed cassette 22 is fed to the image forming unit to form an image, the paper on which the image has been formed is discharged to the outside.

  The image reading device 30 is configured to read an image, that is, read information on a document as image data. Here, the image reading apparatus 30 is configured to read a document as a document fixing type scanner and to read a document as a seed feed type scanner.

  Here, the original fixing type scanner is configured to read an original by scanning the image exposure unit 38 while the original is stationary. The sheet feed type scanner is configured to read a document by conveying the document with the image exposure unit 38 disposed at a fixed position.

  The image reading apparatus 30 includes a first lid member 40 including an automatic document feeder 41 and a second lid member 45 including a platen cover above an image reading main body 32 provided above the image forming unit 20. Either one is attached. The first lid member 40 or the second lid member 45 has a function of a lid part that covers the upper surface of the image reading main body part 32 of the image reading device 30 and a function of a document pressing member that presses the document.

  In the image reading main body 32, a main body cover 34 is attached above a substantially rectangular housing portion 32a in plan view, and an internal space for accommodating various members for reading an image is formed inside these. Yes.

  As shown in FIGS. 1 to 3, a contact glass 35 and a platen glass 36 as a document placement table are attached to the upper surface of the main body cover portion 34. The platen glass 36 is a transparent plate-like member for placing a document when reading an image, and the contact glass 35 is disposed so as to be in contact with the conveyed document when reading an image by a sheet feed method. It is the made transparent elongate member.

  An image exposure unit 38 and a light receiving unit 39 are provided in the internal space of the image reading main body 32.

  The image exposure unit 38 irradiates light on the placed document or the transported document and guides the reflected light toward the light receiving unit 39. The light receiving unit 39 forms an image of the reflected light thus guided, read. The image exposure unit 38 includes a light source that illuminates the document, a mirror (not shown) that reflects light from the document, and the like, and a driving force of a moving unit (not shown) below the contact glass 35 and the platen glass 36. In such a way, it can be moved back and forth while maintaining the readable condition.

  The light receiving unit 39 is configured to be able to form an image of reflected light 39L from the original with a lens on a built-in CCD sensor via the image exposure unit 38 and the like. Thereby, the reflected light from the document is converted into an electric signal.

  When reading a document by the sheet feed method, the document is placed on the contact glass 35 by the automatic document feeder 41 of the first lid member 40 while the image exposure unit 38 is stationary below the contact glass 35. The original is read by being conveyed so as to come into contact with the document.

  When the original is read by the original fixing method, the first lid member 40 or the second lid member 45 is closed so that the original is placed on the platen glass 36 and pressed. In this state (see FIG. 4B and FIG. 6B), the original is read by scanning the image exposure unit 38 below the platen glass 36.

  As shown in FIGS. 1 and 4, the first lid member 40 includes an original mat portion 40 a and an automatic original conveying portion 41. The original mat portion 40a is attached to the platen glass 36 side of the first lid member 40 via a cushion material 40c. The first lid member 40 is rotatably supported by the first hinge 31 on one side of the platen glass 36 of the image reading main body 32 and covers the platen glass 36 and the contact glass 35 so as to be freely opened and closed. ing.

  Then, the original is placed on the platen glass 36 with the first lid member 40 opened, or the original is removed from the platen glass 36 and the original on the platen glass 36 is removed with the first lid member 40 closed. The glass 36 is held in a fixed position so as to be sandwiched between the original mat portion 40a. The pressing surface of the original mat portion 40a is substantially the same color as the original, usually white.

  In addition, the automatic document feeder 41 conveys the documents placed on the tray so as to sequentially come into sliding contact with the contact glass 35.

  In the present embodiment, one of the first lid member 40 and the second lid member 45 is attached to the image reading main body 32. For this reason, as shown in FIG. 3, the attachment portion 31a for attaching the first lid member 40 with the screw 31b and the second lid member 45 are attached to the body cover portion 34 of the image reading body portion 32. A mounting hole 33 is provided.

  As shown in FIGS. 2, 6, and 7, the second lid member 45 is rotatably supported by the second hinge 37 on one side of the platen glass 36 of the image reading main body 32. The second hinge 31 is fixed by inserting the shaft 37b into a mounting hole 33 provided in the image reading main body 32. On the platen glass 36 side of the second lid member 45, a white document mat portion 45a is provided via a cushion material 45c.

  Then, with the second lid member 45 opened, the original is placed on the platen glass 36 or the original is taken out, while the second lid member 45 is closed with the second lid member 45 closed. The document is held at a fixed position so as to be sandwiched between the platen glass 36 and the document mat portion 45a.

  The image reading apparatus 30 is provided with an operation panel 60. The operation panel 60 is provided with various switches 62 and a touch panel 63 for performing various operations on the image forming apparatus 10. The touch panel 63 also functions as a display unit that displays the operation status, operation contents, and the like of the image forming apparatus 10.

  In the present embodiment, the first opening / closing position in which the first lid member 40 or the second lid member 45 is not completely closed, for example, a half-open state (see FIGS. 4A and 6A). ) To detect the size when the background is substantially black, and to set the first lid member 40 or the second lid member 45 to the second opened / closed position, which is in the closed state, and the background in the white state. Size detection is performed (see FIGS. 4B and 6B). Therefore, an open / close sensor in which the first open / close position of the first lid member 40 or the second cover member 45 and the two open / close positions as the second open / close position are configured by the lever 51 and the two photosensors 51a and 51b. Detect at 50.

  When the first lid member 40 is used, the open / close sensor 50 detects the closed state of the first lid member 40 and is used to prevent a paper jam due to erroneous conveyance.

  In the open / close position detection, when the first lid member 40 or the second lid member 45 is opened too much, light such as general illumination enters the light receiving unit 39, causing erroneous detection of the document size by the light receiving unit 39. If the first lid member 40 or the second lid member 45 is too closed, there is a case where the original and the original mat portions 41a and 45a cannot be distinguished and the original size is erroneously detected. For this reason, in the opening / closing position detection, detection is performed at a predetermined opening / closing angle, and size detection is performed at that timing.

  As shown in FIGS. 4 to 7, in the present embodiment, the lever 51 is biased upward by the spring member 51c so that the lever 51 protrudes from the main body cover 34 of the image reading apparatus main body 32. When the second lid member 45 or the first lid member 40 is attached and the lever 51 is closed, the lever 51 enters the image reader main body 32 from the main body cover 34 against the urging force of the spring member 51c. When the second lid member 45 or the first lid member 40 is opened, the lever 51 protrudes from the main body cover portion 34 by the biasing force of the spring member 51c. As described above, the lever 51 is attached to the main body cover portion 34 of the image reading apparatus main body portion 32 so as to be freely retractable.

  And in order to make the lever 51 short, it arrange | positions in the vicinity of the hinges 31 and 37, as shown in FIG.3, FIG.4, FIG.6. Further, as shown in FIGS. 4B and 6B, the close detection is performed with the second lid member 45 and the first lid member 40 slightly opened. This is because the lever 51 is disposed in the vicinity of the hinges 31 and 37 to prevent detection failure due to component variations.

  When the second lid member 45 or the first lid member 40 is closed, the lever 51 is pushed down, and the position of the half-open state shown in FIGS. 4A and 6A is set to the first position. Is detected by the first photosensor 51a. When the second lid member 45 and the first lid member 40 are further closed, the lever 51 is further pushed down, and the closed position shown in FIGS. 4B and 6B is set to the second position. Is detected by the second photosensor 51b. Two open / close positions are detected by one lever 51 and two photosensors 51a and 51b.

Here, the first lid member 40 provided with the automatic document feeder 41 is heavier than the second lid member 45 formed of a platen cover. Therefore, the first hinge 31 that attaches the first lid member 40 to the main body cover 34 of the image reading main body 32 so as to be freely opened and closed is larger than the second hinge 37 that attaches the second lid member 45. ing. As shown in FIGS. 5A and 5B and FIGS. 7A and 7B, the distance A ₁ from the main body cover portion 34 to the rotation center 31 c of the first hinge 31 is determined from the main body cover portion 34. greater than the distance a ₂ up to the rotation center 37c of the second hinge 37, the first cover member 40 and the second lid member 45, so that the rotation center of the hinge are different.

  As described above, when the rotation centers of the first hinge 31 and the second hinge 37 are different, the height at which the lever 51 is pushed according to the open / close position is different. Therefore, in the present embodiment, the photo sensor set when the lever 51 is pushed into the contact portion of the first lid member 40 that contacts the lever 51 and the contact portion of the second lid member 45, respectively. Adjusting members 52 and 53 for adjusting the height of the lever 51 are provided so that the positions of 51a and 51b coincide.

  The relationship between the lever 51, the adjustment members 52 and 53, and the photosensors 51a and 51b will be further described with reference to FIGS.

  FIG. 5A shows a state in which the first lid member 40 is closed to the first open / close position that is half open, and FIG. 5B shows a state in which the first lid member 40 is closed to the second open / close position. 7 (a) shows a state in which the second lid member 45 is closed to the first opening / closing position that is half open, and FIG. 7 (b) shows a state in which the second lid member 45 is closed to the second opening / closing position. .

  The adjustment member 52 provided at a position where the lever 51 of the first lid member 40 contacts is provided with a contact surface where the tapered portion 52a and the horizontal portion 52b are connected. The tip of the lever 51 that contacts the adjusting member 52 is formed with an arcuate curvature. Since the tip of the lever 51 has an arcuate curvature, the lever 51 moves along the adjusting member 52 without resistance, so that the opening / closing operation can be performed smoothly.

  As shown in FIG. 5A, when the first lid member 40 is closed from the opened state to the first opening / closing position that is half open, the tip of the lever 51 moves along the tapered portion 52 a of the adjustment member 52. Then, the lever 51 is pushed down. When the height of the lever 51 reaches B, the lever 51 is detected by the first photosensor 51b. In this state, the tapered portion 52a that is the contact surface of the adjustment member 52 that contacts the tip of the lever 51 is formed to be parallel to the main body cover portion 34, that is, to be parallel to the platen glass 36. .

  Subsequently, when the first lid member 40 is closed until the state of FIG. 5B is reached, the distal end portion of the lever 51 extends along the adjustment member 52 from the tapered portion 52a of the adjustment member 52 to the position of the horizontal portion 52b. Moved and pushed down. When the height of the lever 51 reaches C, the lever 51 is detected by the second photosensor 51b. In this state, the horizontal portion 52 b of the adjustment member 52 that contacts the tip of the lever 51 is formed to be parallel to the main body cover portion 34, that is, to be parallel to the platen glass 36.

  The adjustment member 52 that contacts the lever 51 at the first opening / closing position and the second opening / closing position is formed to be parallel to the main body cover portion 34, that is, to be parallel to the platen glass 36. Even if horizontal variations such as rattling occur, the height of the lever 51 can be kept constant without changing.

  When the first lid member 40 is in the half-open position, that is, the first opening / closing position, the first photosensor 51a detects the lever 51, and therefore the first opening / closing position is determined by the detection of the first photosensor 51a. Will be detected. When the first lid member 40 is in the closed second opening / closing position, the first photosensor 51a and the second photosensor 51b detect the lever 51, and the first photosensor 51a and the second photosensor 51a are detected. The second opening / closing position is detected by the detection of the sensor 51b.

  When the first lid member 40 is opened widely, both the first photosensor 51a and the second photosensor 51b do not detect the lever 51, and the detection result indicates that the first lid member 40 is opened widely. can do.

  As shown in FIGS. 7A and 7B, the adjustment member 53 provided at the portion of the second lid member 45 in contact with the lever 51 is inclined from the first opening / closing position to the second opening / closing position. It is formed with the formed linear rib. The adjustment member 53 is slanted so that the height of the lever 51 when the first lid member 40 is in the first opening / closing position is the same as the height of the lever 51 when the first lid member 40 is in the second opening / closing position. A surface is formed. As described above, the adjustment member 53 can be formed into a simple shape by connecting the first opening / closing position and the second opening / closing position with a straight line.

  As shown in FIG. 7A, when the second lid member 45 is closed to the half open first opening / closing position, the tip of the lever 51 moves along the oblique contact surface of the adjustment member 53, and the lever 51 is pushed down. When the height of the lever 51 reaches B, the lever 51 is detected by the first photosensor 51b.

  Subsequently, when the second lid member 45 is closed until the state of FIG. 7B is reached, the tip of the lever 51 moves along the oblique contact surface of the adjustment member 53 and is pushed down. When the height of the lever 51 reaches C, the lever 51 is detected by the second photosensor 51b.

  When the second lid member 45 is in the half-open position, that is, the first opening / closing position, the first photo sensor 51a detects the lever 51, so that the first opening / closing position is determined by the detection of the first photo sensor 51a. Will be detected. Then, when the second lid member 45 is in the closed second opening / closing position, the first photosensor 51a and the second photosensor 51b detect the lever 51, and the first photosensor 51a and the second photosensor are detected. The second opening / closing position is detected by the detection of the sensor 51b.

  When the second lid member 45 is opened widely, both the first photosensor 51a and the second photosensor 51b do not detect the lever 51, and the detection result detects that the second lid member 45 is opened widely. can do.

  Thus, by providing the adjustment members 52 and 53 on the first lid member 40 and the second lid member 45, respectively, the height of the first opening / closing position and the height of the second opening / closing position of the lever 51 are the first. The time of the first lid member 40 and the time of the second lid member 45 can be matched. As a result, both the first hinge 31 and the second hinge 37 can be detected at the optimum position even if the rotation center of the hinge is changed.

  The adjusting members 52 and 53 described above are matched by the cross-sectional shapes of the first lid member 40 and the second lid member 45, but the surface in contact with the lever 51 is the first lid member 40 or the first lid member 40. The position of the height of the lever 51 may be matched by moving up and down in conjunction with the opening and closing of the second lid member 45.

  FIG. 8 is a block diagram showing a configuration relating to document size detection. The document size detection will be described with reference to FIG.

  Outputs of the first photosensor 51 a and the second photosensor 51 b are given to the control unit 70. The control unit 70 includes a CPU, a RAM, a RAM storage unit, and the like, and has a function as a document size determination unit 71 that determines a document size.

  The control unit 70 controls the image exposure unit 38 and obtains an image signal from the light receiving unit 39. Based on the image signal from the light receiving unit 39, the document size determination unit 71 of the control unit 70 determines the document size.

  When the control unit 70 detects that the first lid member 40 or the second lid member 45 is opened based on the outputs of the first photosensor 51a and the second photosensor 51b, the image exposure unit 38 sets a predetermined document. Move to the width detection position. Then, in the middle of closing the first lid member 40 or the second lid member 45, it is detected that the first lid member 40 or the second lid member 45 has reached the first opening / closing position. It is configured to output a corresponding detection signal. Furthermore, it is configured to detect that the first lid member 40 or the second lid member 45 has reached the second opening / closing position, that is, the closed state, and to output a detection signal corresponding thereto. Therefore, the control unit 70 detects the first opening / closing position and the second opening / closing position based on the outputs of the first photosensor 51a and the second photosensor 51b.

  When the adjustment members 52 and 53 of the first lid member 40 or the second lid member 45 push the lever 51 in the middle of closing the first lid member 40 or the second lid member 45 and reach the first opening / closing position. The first photosensor 51a is turned on, and a detection signal corresponding to the on signal is given to the controller 70.

  When determining that the position is the first opening / closing position, the control unit 70 gives an instruction to perform an original reading operation by the image exposure unit 38 and the light receiving unit 39. Thus, the original is read in the direction of the original width. At the first opening / closing position, the document size determination unit 71 determines the document size by detecting the edge of the document with the background substantially black.

  Subsequently, when the first lid member 40 or the second lid member 45 reaches the closed second opening / closing position, the first photosensor 51a and the second photosensor 51b are turned on. A detection signal corresponding to the ON signal is given to the control unit 70.

  When the control unit 70 determines that the position is the second opening / closing position, the control unit 70 gives a command so that the image exposure unit 38 and the light receiving unit 39 perform a document reading operation. Thus, the original is read in the direction of the original width. At the second opening / closing position, the document size determination unit 71 determines the document size for detecting the edge of the document with white as the background. Then, the document size determination unit 71 specifies the document size based on both detection results.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 20 Image forming part 22 Paper feed cassette 30 Image reading apparatus 31 1st hinge 32 Image reading main body part 34 Main body cover part 35 Contact glass 36 Platen glass (original platen)
37 Second hinge 37c Rotation center 38 Image exposure unit 39 Light receiving unit 40 First lid member 40a Document mat unit 41 Automatic document transport unit 45 Second lid member 45a Document mat unit 51 Lever 51a First photo sensor 51b Second Photo sensor

Claims (7)

There is a lever provided in the image reading device main body so as to be freely retractable. The lever is pushed into the image reading device main body by a lid member, and at least two or more of the opening / closing operations are performed depending on the height of the pushed lever. In the image reading device for detecting the opening / closing position of
An image reading apparatus, wherein an adjustment member for adjusting a height of the pushed lever is provided on the lid member in order to detect an open / close position.   The lid member includes a first lid member to which a first hinge is attached and a second lid member to which a second hinge is attached, and the first lid member or the second lid member Either one of them can be selected and attached to the image reading apparatus main body, and the first hinge and the second hinge have different rotation centers and detect the first opening / closing position of the first lid member. The first lever position and the first lever position for detecting the first opening / closing position of the second lid member are matched by the adjustment member of the first lid member and the adjustment member of the second lid member. And a second lever position for detecting the second opening / closing position of the first lid member and a second lever position for detecting the second opening / closing position of the second lid member. The adjustment member of the lid member and the adjustment member of the second lid member coincide with each other The image reading apparatus according to claim 1, wherein:   The adjustment member of the first lid member is formed so that a surface in contact with the lever is parallel to the upper surface of the image device main body when the first lever position for detecting opening and closing is provided. The image reading apparatus according to claim 2.   The adjustment member of the first lid member is formed so that a surface in contact with the lever is parallel to the upper surface of the image device main body when the second lever position for detecting opening and closing is provided. The image reading apparatus according to claim 2 or 3.   The image reading apparatus according to claim 1, wherein a tip end portion of the lever that contacts the adjusting member has an arcuate curvature.   The distance from the upper surface of the main body of the image device to the rotation center of the hinge is such that the first hinge of the first lid member is larger than the second hinge of the second lid member. 6. The image reading apparatus according to claim 2, wherein an automatic document feeder is provided on the lid member. An image forming apparatus comprising the image reading apparatus, wherein the image reading apparatus according to any one of claims 1 to 6 is used.

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