JP2025007019A - Image reading device and recording device - Google Patents

Abstract

To provide an image reading device capable of improving the operability of attachment and detachment of a guide member.SOLUTION: An image reading device includes a reading unit for reading an image of a document, a transport unit that transports the document and is configured to be rotatable around a rotation axis relatively to the reading unit, and a guide member 203 that guides the document transported by the transport unit and is configured to be attachable to and detachable from the reading unit. In the image reading device for reading the image of the document while transporting the document, in a direction perpendicular to the rotation axis, a side where the rotation axis of the image reading device is located is defined as a first side, and a side opposite to the first side is defined as a second side. A gripping unit 203H that is gripped by an operator is provided on the second side of the guide member.SELECTED DRAWING: Figure 20

Description

The present invention relates to an image reading device for reading an image of a document.

Conventionally, copying machines and multifunction machines equipped with an image reading device for reading a document are known. Such image reading devices are known to have a configuration including a reading section having an image sensor unit for reading an image on a document, and a transport section having an automatic document feeder or the like capable of automatically transporting a sheet-like document. When the document is passed through the reading section by the transport section, the image on the document is read by the image sensor unit.

Patent document 1 discloses an image reading device in which a transport section is configured to be openable and closable relative to a reading section, and a guide member that guides a document is detachably attached to the main body of the image reading device.

JP 2011-114433 A

The present invention aims to provide an image reading device that can improve the operability of the guide member.

In order to achieve the above object, an image reading device according to the present invention comprises:
A reading unit that reads an image of a document;
a transport unit configured to transport a document and be rotatable about a rotation axis relative to the reading unit;
a guide member that guides the document transported by the transport unit, the guide member being configured to be detachable from the reading unit;
An image reading apparatus for reading an image of a document while conveying the document, comprising:
In a direction perpendicular to the pivot axis, the side on which the pivot axis of the image reading device is located is defined as a first side, and the side opposite the first side is defined as a second side.The guide member is characterized in that a gripping portion for an operator to grip is provided on the second side.

The present invention provides an image reading device that can improve the operability of the guide member.

1 is a perspective view of a multifunction peripheral according to a first embodiment; 1 is a cross-sectional view of an image reading device according to a first embodiment. FIG. 2 is an explanatory diagram of a scanner unit according to the first embodiment. FIG. 2 is a rear view of the glass frame unit of the first embodiment. FIG. 2 is an explanatory diagram of a reading unit according to the first embodiment. FIG. 2 is a top view showing the internal configuration of a scanner unit according to the first embodiment. 1 is a cross-sectional view of an image sensor according to a first embodiment. FIG. 2 is a block diagram showing an electric circuit configuration of the first embodiment. 5A to 5C are explanatory diagrams of the operation of the reading unit according to the first embodiment. 4 is a cross-sectional view showing an operating position of the reading unit of the first embodiment. FIG. 4 is a cross-sectional view showing an operating position of the reading unit of the first embodiment. FIG. FIG. 4 is an operational sequence diagram when power is turned on in the first embodiment. FIG. 11 is an operational sequence diagram when reading a flat bed in the first embodiment. FIG. 4 is a sequence diagram of an operation during ADF reading in the first embodiment. FIG. 4 is a distribution diagram of image brightness levels when a white sheet is read in the first embodiment. FIG. 2 is an explanatory diagram of a glass frame unit according to the first embodiment. 5 is an explanatory diagram of a document size indicator member according to the first embodiment. FIG. 3A and 3B are a top view and an exploded view of a removable transport guide of the first embodiment. 5A and 5B are diagrams illustrating the positional relationship between a reading unit and a transport guide according to the first embodiment. 5A to 5C are explanatory diagrams of an engagement configuration between a transport guide and a glass frame in the first embodiment. 5A and 5B are explanatory diagrams of a configuration for preventing erroneous installation of the transport guide according to the first embodiment. 5A to 5C are explanatory diagrams of an auxiliary attachment configuration for the transport guide according to the first embodiment. FIG. 11 is a perspective view showing a gripping portion of a transport guide according to a second embodiment.

The following describes in detail an exemplary embodiment of the present invention with reference to the drawings. Note that the dimensions, materials, shapes, and relative positions of the components described in the embodiment are subject to change as appropriate depending on the configuration and various conditions of the device to which the invention is applied. In other words, it is not intended to limit the scope of the present invention to the following embodiment.

The image reading device of the present invention can be applied to, for example, a flatbed scanner device, or a copying machine, facsimile, multifunction machine, etc., which combines a flatbed scanner device with a printing device, etc. The present invention is particularly suitable for an image reading device that has a document transport reading method as a document reading method and is equipped with a detachable sheet transport guide. Below, an image reading device that imports document images into a computer, etc. will be described as an example of an image reading device to which the present invention is applied. Note that the same reference numerals indicate the same or corresponding parts throughout the drawings. The X direction shown appropriately in the drawings is the left-right direction of the image reading device, the Y direction is the depth direction, and the Z direction is the height direction. In the following embodiments, the X direction, Y direction, and Z direction are mutually perpendicular.

First Embodiment
[Image reading device 100]
1 is an external perspective view of a multifunction machine 1 in which an image reading device 100 according to a first embodiment of the present invention is combined with a printing device 400, which is an inkjet printer. The printing device 400 is capable of printing (recording) an image read by the image reading device 100 using a recording means. The image reading device 100 is broadly composed of a scanner unit 200 as a reading unit that reads an image of an original document, and an ADF (Auto Document Feeder) unit 300 as a conveying unit configured to be able to convey sheets such as original documents. Note that the printing device 400 is not limited to an inkjet printer, and may be, for example, a laser printer (electrophotographic image forming device).

The ADF unit 300 is configured to be openable and closable around a pivot shaft relative to the scanner unit 200 so that an original document can be placed on the scanner unit 200. The pivot shaft extends in the left-right direction (X direction) at the rear end of the image reading device 100, and the user can manually open and close the ADF unit 300, for example, from the front side of the image reading device 100. Figure 1 shows the image reading device 100 with the ADF unit 300 open, and the pivot axis PL of the pivot shaft is indicated by a dashed line.

Next, the configuration of the ADF unit 300 of the image reading device 100 will be described with reference to FIG.
Fig. 2 is a cross-sectional view of the scanner unit 200 and ADF unit 300 of the image reading device 100. Fig. 2 shows a cross-section of the image reading device 100 in the X-Z plane when the ADF unit 300 is closed. In Fig. 2, the ADF unit 300 shows the path of the document passing through document transport path 311 with a solid arrow. A part of the document transport path 311 is formed by a part of the scanner unit 200.

The ADF unit 300 includes a document placement platform 301 on which a document is placed, a document transport mechanism configured to transport sheet-like documents, and a document discharge unit 303. The configuration of the document transport mechanism will be described below, starting from the upstream side in the document transport direction. Here, the document transport mechanism is a transport means including a sheet transport mechanism from the pickup roller 304 to the discharge roller 309, which will be described below.

The document 310 to be automatically transported is first placed on the document placement tray 301 provided on the upper part of the ADF unit 300. The document 310 placed on the document placement tray 301 is transported toward the separation roller 305 by the pickup roller 304 of the document transport mechanism. The document 310 is then transported one by one by the separation roller 305 and the separation pad 306 to the transport roller 307 on the downstream side in the transport direction. Next, the document 310 is transported by the transport roller 307 to the transport guide 203 on the downstream side in the transport direction. The transport guide 203 is a guide member that is detachably provided to the image reading device 100. When the document 310 passes through the transport guide 203, the document 310 is pressed by the white pressure plate 308 and is brought into close contact with the transport guide 203. At this time, the document 310 is read by the image sensor 206. The white pressure plate 308 is sized to cover the entire area of the image sensor 206 in the main scanning direction (Y direction).

The original 310 that has passed through the transport guide 203 passes through an original size indicator member 205 located downstream of the transport guide 203 in the transport direction, and is discharged to the original discharge section 303 by a discharge roller 309 located downstream of the transport guide 203 in the transport direction. The transport guide 203 and the original size indicator member 205 are components of the scanner section 200. The original transport mechanism section is provided with various original detection sensors (not shown), and is configured to be able to detect the passage of the leading and trailing ends of the original. The detection results (outputs) of the various original detection sensors are used to control the timing of reading by the image sensor 206.

There are two methods for reading documents in the image reading device 100: a fixed document reading method (flatbed reading) and a document transport reading method (ADF reading). In the fixed document reading method, the document is fixed on the glass table 202 of the scanner unit 200, and the document is read by moving the reading unit 207 in the sub-scanning direction (X direction). In the document transport reading method, the reading unit 207 is fixed in a predetermined position (ADF position) below the removable transport guide 203, and the document is transported by the ADF unit 300 while being read.

The reading unit 207 of the scanner section 200 in FIG. 2 is in a standby state at the ADF position to read the document 310 that is automatically transported by the ADF section 300.

[Scanner unit 200]
Next, the configuration of the scanner unit 200 of the image reading device 100 will be described. FIG. 3(a) is a top view of the scanner unit 200 in a state where the ADF unit 300 is removed from the image reading device 100, and shows the entire glass frame unit 201. FIG. 3(b) is a cross-sectional view taken along line A-A in FIG. 3(a), showing the scanner unit 200 from the main scanning direction (Y direction). FIG. 3(c) is a cross-sectional view taken along line B-B in FIG. 3(a), showing the scanner unit 200 from the sub-scanning direction (X direction). FIG. 3(d) is an enlarged view of part C in FIG. 3(b), showing the configuration around the document size indicator member 205 of the glass frame unit 201.

The glass frame unit 201 is composed of a glass table 202 on which an original 310 is placed, a transport guide 203 that guides the automatically transported original 310, and a glass frame 204 that holds the transport guide 203. The transport guide 203 is detachably held by the glass frame 204. The glass frame 204 includes an original size indicator member 205 and an original abutment reference 226 between the glass table 202 and the transport guide 203.

A white sheet 224 is placed on the original placement surface side of the glass table 202. In FIG. 3(d), the white area 224W and the black area 224B of the white sheet 224 are shown in simplified form. The white area 224W and the black area 224B of the white sheet 224 are shown in detail in FIG. 4.

Figure 4 is a rear view of the glass frame unit 201 in Figure 3 (a), and is a view of the glass frame unit 201 viewed from the printing device 400 side. A part of the white sheet 224 is shown in Figure 4. The glass table 202 is abutted against two glass frame abutment portions 228 of the glass frame 204, and the position in the X direction is determined. The white sheet 224 is located on the rear side of the glass table 202, on the document placement surface, in the direction of view of this figure. As shown in Figure 4, the position of the white sheet 224 in the X direction is between the glass frame abutment portions 228 and the stationary document reading area 237.

The white sheet 224 is integrally provided with a white area 224W for performing shading correction of the image sensor 206 of the reading unit 207, and a black area 224B which is the sub-scanning direction reference position of the image sensor 206 as shown in FIG. 6. In order to perform shading processing, the white sheet 224 is sized to cover the entire area of the image sensor 206 in the main scanning direction (Y direction). The sub-scanning direction (X direction) position of the black area 224B in the white sheet 224 is closer to the stationary document reading area 237 than the white area 224W.

Figures 5(a) to (c) are explanatory diagrams of the reading unit 207 that reads an original image. Figure 5(a) is an oblique view of the reading unit 207 seen from the front side. Figure 5(b) is an oblique view of the reading unit 207 seen from the back side. Figure 5(c) is an exploded oblique view of the reading unit 207.

The reading unit 207 is composed of an image sensor 206, a sensor holder 217, a slider 218, and a drive transmission unit 219 that transmits a drive force to the reading unit 207. Note that the reading unit 207 is not limited to the above-mentioned configuration, and a known image sensor unit such as a contact image sensor (CIS: Contact Image Sensor) can be used. The image sensor unit is composed, for example, of an image sensor having a roughly rectangular parallelepiped housing mounted on a holding member.

A roller unit 211 is disposed at one end of the image sensor 206 in the main scanning direction (Y direction), and a roller unit 212 is disposed at the other end. The roller units 211 and 212 are provided to ensure the focal distance with respect to the original. A roller 213 is rotatably disposed at one end of the roller unit 211 in the sub-scanning direction (X direction), and a roller 214 is rotatably disposed at the other end. Similarly, a roller 215 is rotatably disposed at one end of the roller unit 212 in the sub-scanning direction (X direction), and a roller 216 is rotatably disposed at the other end. In addition, a pressure spring 232 is disposed between the image sensor 206 and the sensor holder 217, and the pressure spring 232 constantly presses the image sensor 206 against the back surface (lower surface) of the glass table 202 located above. The rollers 213 to 216 are configured to roll on the back surface of the glass table 202 when the reading unit 207 moves in the sub-scanning direction (X direction).

Fig. 6 is a top view of the scanner unit 200 with the glass frame unit 201 removed. The scanner unit 200 includes a motor 220, a guide rail 221, a belt 222, and a base frame 223. Fig. 6 shows the internal configuration of the entire scanner unit 200, and illustrates the relative positions of the reading unit 207 and the base frame 223.

A guide rail 221 with its longitudinal direction in the sub-scanning direction is disposed in the center of the base frame 223 in the Y direction. The slider 218 of the reading unit 207 is disposed on the guide rail 221 so as to be slidable in the sub-scanning direction (X direction). The reading unit 207 is connected to a belt 222 via a drive transmission unit 219. When a drive input is applied to the motor 220, the belt 222 moves in response to the input, and the reading unit 207 scans back and forth along the guide rail 221. With this configuration, the reading unit 207 is configured to be movable in the sub-scanning direction.

In the first embodiment, the drive unit is disposed on the base frame 223 and is a belt-driven type in which the drive force is transmitted by the belt 222, but the reading unit may be a self-propelled type in which the drive unit is disposed on the reading unit 207.

[Electrical configuration of the reading unit 207]
Next, the electrical configuration of the reading unit 207 will be described with reference to Figs. 7 and 8. Fig. 7 is a cross-sectional view of the image sensor 206. The image sensor 206 incorporates LEDs 102, which are three-color light-emitting elements, a rod lens array 209, and a light-receiving element 101. Light irradiated from the LEDs 102 to the document passes through the glass table 202 and is reflected by the document surface. This reflected light is imaged on the light-receiving element 101 by passing through the rod lens array 209. The image sensor 206 sequentially switches the three-color LEDs 102 on and reads the reflected light from the document for each color, thereby performing color separation reading. That is, the image sensor 206 is an optical unit that includes the LEDs 102 as a light-emitting unit and the light-receiving element 101 as a sensor unit (light-receiving unit).

Figure 8 is a block diagram showing the configuration of the control circuit of the reading unit 207 in this embodiment. Below, the circuit operation of the control circuit according to the first embodiment will be described with reference to Figure 8. In Figure 8, the image sensor 206 is a sensor in which three color LEDs 102, which are light sources, are integrated. This image sensor 206 is moved in the scanning direction under the glass table 202. At the same time, the LED drive circuit 103 switches and lights up the LEDs 102 of each color for each line, making it possible to read a color image in RGB line sequence. The AMP 104 is an amplifier that amplifies the signal output from the image sensor 206. The A/D conversion circuit 105 is an A/D converter that performs A/D conversion of the amplified output to obtain, for example, an 8-bit digital output.

The shading RAM 106 stores data for shading correction obtained by reading the white area 224W for the shading processing described above and performing arithmetic processing on the data. The shading correction circuit 107 performs shading correction on the image data read by the image sensor 206 based on the data from the shading RAM 106.

The peak detection circuit 108 is a circuit that detects the peak value in the read image data for each line, and is used to detect the reference position of the reading unit 207. The gamma conversion circuit 109 performs gamma conversion on the read image data according to a gamma curve preset by the host computer, which will be described later. The buffer RAM 110 is a memory that temporarily stores image data in order to match the timing of the actual reading operation and communication with the host computer.

The packing/buffer RAM circuit 111 performs packing processing according to an image output mode (binary, 4-bit multi-value, 8-bit multi-value, 24-bit multi-value, etc.) preset by the host computer, and then performs processing to write the data to the buffer RAM 110. The packing/buffer RAM circuit 111 also performs processing to transfer image data from the buffer RAM 110 to an interface circuit 112 for output. The interface circuit (transfer means) 112 receives control signals and outputs image signals between it and an external device 113, such as a computer, which serves as a host device for the image reading device 100 according to the first embodiment.

The CPU 115 is, for example, a microcomputer type CPU, and has a ROM 115a storing processing procedures and a working RAM 115b, and is a control unit that controls each part according to the procedures of the program stored in the ROM 115a. The CPU 115 controls the rotation direction, rotation speed, and rotation amount of the motor 220 by reading the slit information of the code wheel rotatably fixed on the same axis of the motor 220 with an encoder. In other words, the CPU 115 controls the movement direction, movement speed, distance, etc. of the reading unit 207. The oscillator 116 is, for example, a crystal oscillator. The timing signal generating circuit 114 divides the output of the oscillator 116 according to the settings of the CPU 115 to generate various timing signals that serve as the basis for operation. The CPU 115 can selectively execute an ADF reading operation (first reading operation) in which an image of a document is read while the document is being transported, and a flatbed reading operation (second reading operation) in which an image of a document on the glass table 202 is read while the reading unit 207 is moved.

Here, in the first embodiment, the boundary between the black area 224B and the white area 224W of the white sheet 224 described above serves as a reference mark for image reading by the image sensor 206. The reference mark (the boundary between the black area 224B and the white area 224W) read by the image sensor 206 is detected by an encoder and stored as a reference position in the RAM 115b in the CPU 115. The detection means for detecting the reference mark and the control means for determining the reference position of the image sensor 206 based on the detected reference mark and starting image reading are configured by the CPU 115.

When the image reading device 100 is turned on, the image sensor 206 is initialized and moved based on a reference position determined by a reference mark detected in the sub-scanning direction before reading an image. In addition, the image sensor 206 is moved based on the reference position read from the storage means described above after reading an image.

[Operation of the reading unit 207]
Next, the operation of the reading unit 207 will be described with reference to Figures 9, 10(a)-(c), 11(a)-(d), 12, 13, and 14. Figure 9 is an explanatory diagram of the operation of the reading unit 207. Figures 10(a)-(c) and 11(a)-(d) are explanatory diagrams showing a state in which the reading unit 207 is in a predetermined operating position. Figure 12 is an operation sequence diagram when the power is turned on. Figure 13 is an operation sequence diagram when flatbed reading is performed. Figure 14 is an operation sequence diagram when ADF reading is performed.

Positions a, b, c, d, e, f, g, and h indicated by dashed lines in Figure 9 indicate the positions of the optical centers of the rod lens array 209 of the image sensor 206 when the reading unit 207 is in a predetermined position. Specifically, the predetermined positions are the pre-power-on position a, the initialization position b, the reference position c, the home position d (shading start position), the shading end position e, the reading start position f, the ADF reading position g, and the transport guide detection position h. In Figure 9, the white area 224W and the black area 224B are simply shown in the cross-sectional view, but in reality they are configured as described in Figure 4.

Before power is turned on, the reading unit 207 is basically in the pre-power-on position a shown in Fig. 9. The sub-scanning position of the reading unit 207 in this state may be any position other than the pre-power-on position a, because the next initialization operation is always performed after power is turned on.

(Power-on operation)
The operation of the image reading device 100 when the power is turned on will be described with reference to the operation sequence diagram of Fig. 12. Immediately after the power is turned on, since there is no position information in the device memory, the reading unit 207 moves in the return direction as an initialization operation. In the initialization operation, the reading unit 207 moves under the glass table 202 until the slider abutment portion 231 of the slider 218 abuts against the base frame abutment portion 230 of the base frame 223 (S101).

After that, the reading unit 207 cannot move any further, so the load on the motor 220 that drives the reading unit 207 increases, and the current supplied to the motor 220 also increases proportionally. Utilizing such characteristics of the motor 220, a threshold value is set for the current value, and the reading unit 207 is configured to determine that it has hit the inner wall of the base frame 223 when the current value reaches the threshold value. The position of the reading unit 207 at this time is the initialization position b. Figure 10 (a) shows the state when the reading unit 207 is in the initialization position b.

Next, the reading unit 207 starts moving in the scanning direction to detect the reference position c, which is the boundary between the white area 224W and the black area 224B on the white sheet 224. The image sensor 206 reaches a position where it can read the reference mark. Figure 10(b) shows the state in which the reading unit 207 is at the reference position c.

When the image sensor 206 detects the reference mark (the boundary between the white area 224W and the black area 224B), the CPU 115 sets the reference mark detection position as the first reference position c-1 based on the encoder signal (S102). The first reference position c-1 thus detected during movement in the scanning direction is stored in the RAM 115b as the reference for flatbed reading (S103).

Next, the reading unit 207 moves a specified amount in the return direction from the reference position c to the home position d in response to an instruction from the CPU 115 (S104). In the first embodiment, this home position d is the shading start position. Figure 10(c) shows the state in which the reading unit 207 is at the home position d.

In this way, after the power is turned on, the initialization operation is performed, and the reading unit 207 detects the reference position c and moves to the home position d.

(Flatbed reading operation)
Next, the operation of the image reading device 100 during flatbed reading will be described with reference to the operation sequence diagram of Fig. 13. Before reading an image, the reading unit 207 performs shading processing of the image sensor 206 in response to an instruction from the CPU 115. The reading unit 207 reads a predetermined length of the white area 224W at a predetermined reading resolution while moving in the scanning direction from the home position d, which is the shading start position, and ends the shading processing (S201). The position of the reading unit 207 at this time is the shading end position e. Fig. 11(a) shows the state in which the reading unit 207 is at the shading end position e.

Next, the reading unit 207 moves a specified distance from the first reference position c-1 stored in RAM 115b, accelerates in the sub-scanning direction, and starts image reading from the reading start position f when a stable reading speed is reached (S202-S203). Figure 11(b) shows the state in which the reading unit 207 is at the reading start position f.

The above-described configuration improves the reading position accuracy of the image sensor 206 and reduces variation in the image sensor operating area. After the reading operation is completed, the reading unit 207 moves in the sub-scanning direction toward the first reference position c-1.

After the movement operation is completed, the reference position is detected again in the scanning direction (S204). Then, the first reference position c-1 is stored in the RAM 115b (S205), and the reading unit 207 moves to the home position d (S206), completing the flatbed reading operation.

(ADF scanning operation)
Next, the operation of the image reading device 100 during ADF reading will be described with reference to the operation sequence diagram of Fig. 14. When ADF reading is instructed by the CPU 115, the reading unit 207 moves from the home position d to the transport guide detection position h (S401). Fig. 11D shows the state in which the reading unit 207 is at the transport guide detection position h.

The reading unit 207 stops after moving to the transport guide detection position h, where the image sensor 206 reads the entire longitudinal area of the image sensor 206. The detection pattern output by this reading is used to detect whether the transport guide 203 is attached to a predetermined position of the image reading device 100. Then, based on the detection result, the control unit determines whether to execute the document reading operation. The method of detecting the attachment state of the transport guide 203 based on the detection pattern, which is the output result of the image sensor 206, will be described in detail later.

If it is determined that the transport guide 203 is not attached to the image reading device 100 in the specified position (NO in S402), information indicating that the transport guide was not detected normally (transport guide detection error) is displayed on the display screen (S403). In S403, instead of simply notifying the error, a notification may be given to the user to check whether the transport guide is attached to the specified position. The method of notification is not limited to display on the display screen, and notification via the external device 113, or notification using sound, vibration, etc. may also be used. The control unit then decides to stop the reading operation, and the reading unit 207 moves to home position d and ends the operation (S306).

If it is determined that the transport guide 203 is attached to the image reading device 100 at a predetermined position (YES in S402), the control unit decides to continue the reading operation. Then, the reading unit 207 performs shading processing of the image sensor 206 according to instructions from the CPU 115 (S201).

After the shading process, the reading unit 207 moves in the scan direction to pass the reference position c, then moves in the return direction to detect the reference mark (the boundary between the white area 224W and the black area 224B) with the image sensor 206 (S301). Then, the CPU 115 sets the reference mark detection position as the second reference position c-2 based on the encoder signal. The second reference position c-2 when moving in the return direction is stored in the RAM 115b as the reference for ADF reading (S302).

The reading unit 207 moves a specified amount in the return direction from the second reference position c-2 and stops at the ADF reading position g (S303). Figure 11 (c) shows the state in which the reading unit 207 is at the ADF reading position g.

With the above-mentioned configuration, the second reference position c-2 is used when moving in the return direction, improving the positional accuracy when moving in the return direction, reducing the variation in the image sensor operating area, and enabling improved accuracy when reading with the ADF.

When ADF reading is completed, the reading unit 207 moves in the scanning direction and detects the first reference position c-1 (S304). The first reference position c-1 is then stored in the RAM 115b (S305), and the reading unit 207 moves to the home position d (S306).

In this configuration, the first reference position c-1 is used when reading from a flatbed, and the second reference position c-2 is used when reading from an ADF, making it possible to move the reading unit 207 accurately to the desired position without being affected by backlash in the drive train. This in turn enables highly accurate reading during each reading operation.

Next, the operation when flatbed reading and ADF reading are performed multiple times will be described. When flatbed reading is performed after flatbed reading, the sequence operation of FIG. 13 is performed, and then the sequence operation of FIG. 13 is performed again. When ADF reading is performed after flatbed reading, the sequence operation of FIG. 13 is performed, and then the sequence operation of FIG. 14 is performed. When flatbed reading is performed after ADF reading, the sequence operation of FIG. 14 is performed, and then the sequence operation of FIG. 13 is performed. When ADF reading is performed after ADF reading, the sequence operation of FIG. 14 is performed, and then the sequence operation of FIG. 14 is performed again. At this time, the first reference position c-1 and the second reference position c-2 stored in RAM 115b are overwritten and held each time.

[Relationship between the illumination direction of the white sheet 224 and the image sensor 206]
Next, the relationship between the white area 224W and the black area 224B in the white sheet 224 and the illumination direction in the image sensor 206 will be described.

Figure 15 is a graph of the brightness levels of an image read by the image sensor 206 on the white sheet 224. Figure 15 shows the distribution of image brightness levels in the sub-scanning direction, which corresponds to the E-E cross section in Figure 4. The vertical axis of the graph in Figure 15 shows the brightness level, and the horizontal axis shows the distance in the sub-scanning direction.

In FIG. 15, the solid line graph shows the brightness level when irradiated from the direction of solid line arrow 235 in FIG. 7, and the dashed line graph shows the brightness level when irradiated from the direction of dashed line arrow 236 in FIG. 7. In FIG. 7, the light guide 208 that irradiates light in the direction of solid line arrow 235 is disposed on the white region 224W side in the sub-scanning direction relative to the rod lens array 209. The light irradiation direction is from the white region 224W side toward the black region 224B side.

In the first embodiment, the light is emitted in the direction of the solid arrow 235 shown in FIG. 7 from the white area 224W side to the black area 224B side, so there is no effect of black glare. With this configuration, it is possible to minimize the width of the white sheet 224 in the sub-scanning direction without reducing shading accuracy, so that both improved image quality and a more compact device can be achieved.

[Glass frame unit 201]
16 is an exploded perspective view of the glass frame unit 201 including the glass table 202, the transport guide 203, the glass frame 204, and the document size indicator member 205.

When assembling the glass frame unit 201, first, the document size indicator member 205 is attached to the glass base 202. Then, the integrated glass base 202 and document size indicator member 205 are attached to the glass frame 204.
A transport guide 203 is attached to the glass table 202 , and the transport guide 203 is disposed on the upper surface of the glass table 202 .

The transport guide 203 is a member that is long in the width direction (Y direction) of the document to be guided, and guides the document in a direction intersecting the width direction of the document. The transport guide 203 has a first engagement portion 203R at an end of a first side in the longitudinal direction, and a second engagement portion 203F at an end of a second side opposite the first side. The glass frame 204 has a first engaged portion 204R that engages with the first engagement portion 203R, and a second engaged portion 204F that engages with the second engagement portion 203F. The transport guide 203 is attached to the glass frame 204 by the first engagement portion 203R engaging with the first engaged portion 204R and the second engagement portion 203F engaging with the second engaged portion 204F. In the first embodiment, the first side is the rear side of the image reading device 100 where the rotation axis of the ADF unit 300 is located, and the second side is the front side of the image reading device 100.

The transport guide 203 also has a gripping portion 203H for the user (operator) to grip, and an arm portion 203G that assists in the attachment operation of the transport guide 203 to the glass frame 204. The gripping portion 203H and the arm portion 203G are provided at the end of the transport guide 203 on the second side in the longitudinal direction, similar to the second engagement portion 203F.

The first engaging portion 203R engages with the first engaged portion 204R, and the second engaging portion 203F engages with the second engaged portion 204F, so that the transport guide 203 is attached to a predetermined position of the scanner unit 200 (image reading device 100). The first engaging portion 203R and the second engaging portion 203F are provided at both ends of the transport guide 203 in the longitudinal direction, so that the transport guide 203 is stably attached to the glass frame 204. In addition, the user can grasp the grip portion 203H to easily attach and detach the transport guide 203. The detailed configuration of these engaging portions will be described later.

Figure 17(a) is a top view of the document size indicator member 205, and Figure 17(b) is a bottom view of the document size indicator member 205. A white sheet 224 is attached to the bottom side of the document size indicator member 205. When performing flatbed reading, the user uses the document size indicator member 205 as an indicator to place the document in an appropriate position on the glass table 202 according to the size of the document, so that the image on the document can be read appropriately.

Figure 18(a) is a top view of the transport guide 203, and Figure 18(b) is an exploded view of the transport guide 203. The transport guide 203 is a guide means composed of a Mylar sheet holding member 203a, a black Mylar sheet 203b, and a transparent Mylar sheet 203c.

The Mylar sheet holding member 203a guides the transported document with a guide surface and ribs, and holds the black Mylar sheet 203b and the transparent Mylar sheet 203c. The black Mylar sheet 203b is a sheet-like member that is almost opaque to light. Two cutouts BC are formed in the black Mylar sheet 203b at different positions in the main scanning direction (Y direction), and light is transmitted through the cutouts BC. The black Mylar sheet 203b is provided to detect the installation state of the transport guide 203. The transparent Mylar sheet 203c is a sheet-like member that transmits light. The transparent Mylar sheet 203c guides the transported document on the downstream side of the Mylar sheet holding member 203a in the transport direction (document reading section). In other words, the transport guide 203 includes a light-transmitting section formed by the transparent Mylar sheet 203c and a non-light-transmitting section formed by the black Mylar sheet 203b. During document reading operation, the image sensor 206 reads the document through the transparent Mylar sheet 203c, which is a light-transmitting portion.

The first engaging portion 203R, the second engaging portion 203F, the gripping portion 203H, and the arm portion 203G of the conveying guide 203 are all formed on the Mylar sheet holding member 203a.
R is a first protruding portion protruding from the end of the first side to the first side in the longitudinal direction (Y direction). The second engagement portion 203F is a second protruding portion protruding from the end of the second side to the second side in the longitudinal direction (Y direction). The gripping portion 203H protrudes from the end of the second side upstream and upward in the document guide direction and faces the upper surface of the glass table 202 (the surface facing the scanner unit 200). A gap is formed between the gripping portion 203H and the facing surface of the glass table 202 for the user to insert his/her finger. In addition, the gripping portion 203H is formed with a sufficient width in the longitudinal direction for the user to pinch it with his/her fingers. The arm portion 203G is provided at the end of the second side and extends from the end of the second side to the second side and the downstream side in the document guide direction.

Figures 19(a) and (b) are diagrams showing the positional relationship between the reading unit 207 and the transport guide 203 during ADF reading. Figure 19(a) is a top view of the transport guide 203 attached to the glass frame 204. Figure 19(b) is a cross-sectional view taken along line F-F of Figure 19(a), showing the reading unit 207 and the transport guide 203 in the main scanning direction (Y direction). During ADF reading, the reading unit 207 performs a reading operation at ADF reading position g. The ADF reading position g is a position directly below the transparent Mylar sheet 203c, and is a position that does not overlap with the black Mylar sheet 203b in the vertical direction. The reading unit 207 reads the original through the glass table 202 and the transparent Mylar sheet 203c using the image sensor 206.

[Transport guide 203]
Next, the detailed configuration of the transport guide 203 will be described. Figures 20(a) to (h) are explanatory diagrams of the engagement configuration of the transport guide 203 and the glass frame 204, and the gripping portion 203H. Figure 20(a) is a top view showing the state in which the transport guide 203 is attached to the glass frame 204. Figure 20(b) is an enlarged view of the K portion in Figure 20(a), showing the vicinity of the first engaged portion 204R located on the first side (rear side) of the image reading device 100. Figure 20(c) is an enlarged view of the L portion in Figure 20(a), showing the vicinity of the second engaged portion 204F located on the second side (front side) of the image reading device 100.

A downwardly recessed recess 204H is formed at a position of the glass frame 204 corresponding to the gripping portion 203H. The recess 204H is located upstream of the gripping portion 203H in the document guide direction, and is a slope that slopes downward toward the downstream side. The provision of the recess 204H makes it easier to insert a finger under the gripping portion 203H when removing the gripping portion 203H, improving the operability of the gripping portion 203H.

The method of engagement between the second engaging portion 203F of the transport guide 203 and the second engaged portion 204F of the glass frame 204 will now be described. Figure 20(d) is a cross-sectional view taken along line G-G in Figure 20(c), showing how the second engaging portion 203F and the second engaged portion 204F are engaged. Figure 20(e) is the same cross-sectional view taken along line G-G as Figure 20(d), showing the state in which the transport guide 203 has been removed.

The second engaged portion 204F has a snap-fit configuration and is composed of an elastic portion 204Fa that elastically deforms with the attachment and detachment of the transport guide 203, and a fixed portion 204Fb. The elastic portion 204Fa is composed of a root portion extending upward from the upper surface of the glass frame 204, an intermediate portion extending downward from the tip of the root portion and downstream in the guide direction, and an abutment portion extending downward from the tip of the intermediate portion. The fixed portion 204Fb extends upward from the upper surface of the glass frame 204, is located downstream of the elastic portion 204Fa in the guide direction, and faces the abutment portion of the elastic portion 204Fa. A gap portion 204Fc is formed between the elastic portion 204Fa and the fixed portion 204Fb as a space into which the second engaged portion 203F is inserted. The gap 204Fc can also be considered as a groove that opens vertically upward and is formed by the elastic part 204Fa, the fixed part 204Fb, and the glass base 202.

When the transport guide 203 is attached, the second engagement portion 203F is inserted into the gap 204Fc from above. The second engagement portion 203F abuts against the elastic portion 204Fa and the fixed portion 204Fb, and enters the gap 204Fc while pressing against the elastic portion 204Fa to elastically deform it, so that the second engagement portion 203F fits inside the gap 204Fc. In this way, the elastic portion 204Fa is configured to abut against the second engagement portion 203F during the insertion process of the second engagement portion 203F, and elastically deform in the direction in which the width of the gap 204Fc increases.

When the second engaging portion 203F is removed from the second engaged portion 204F, the contact position of the elastic portion 204Fa against the second engaging portion 203F gradually moves to the base. Then, the elastic force of the elastic portion 204Fa pressing the second engaging portion 203F gradually increases in the process of removing the second engaging portion 203F from the second engaged portion 204F. With this configuration, it is possible to prevent the engagement between the second engaging portion 203F and the second engaged portion 204F from being unintentionally released.

The method of engagement between the first engaging portion 203R of the transport guide 203 and the first engaged portion 204R of the glass frame 204 will now be described. Figure 20(f) is an H-H cross-sectional view of Figure 20(b), showing the state in which the first engaging portion 203R and the first engaged portion 204R are engaged. Figure 20(g) is the same H-H cross-sectional view as Figure 20(f), showing the state in which the transport guide 203 has been removed.

The first engaged portion 204R is a hole 204Ra that opens in the depth direction (Y direction) of the image reading device 100. In addition, above the hole 204Ra, a slope 204Rb is formed that slopes downward as it approaches the downstream side in the guide direction. When the transport guide 203 is attached, the first engaging portion 203R is inserted into the first engaged portion 204R in the depth direction, and the first engaging portion 203R and the first engaged portion 204R engage with each other.

When attaching the transport guide 203 to the glass frame 204, the ADF unit 300 is opened. The working space is wide at the front in the depth direction (Y direction) but narrow at the back, and there is no room around the first engaging part 203R and the first engaged part 204R at the back. Therefore, by configuring the transport guide 203 so that the installation can be completed with a simple installation work of just inserting the first engaging part 203R into the first engaged part 204R at the back in the depth direction, it is possible to improve the workability of the installation work of the transport guide 203.

The first engaged portion 204R also has a sloped surface 204Rb at the top to prevent the transport guide 203 from being erroneously attached. The effect of the sloped surface 204Rb in preventing the transport guide 203 from being erroneously attached will be described later. Note that in the first embodiment, the cross-sectional shape of the first engaged portion 203R and the hole 204Ra is substantially rectangular, but the cross-sectional shape may be circular or another shape.

Next, the gripping portion 203H and its surrounding structure will be described. Figure 20(h) is a cross-sectional view taken along line J-J in Figure 20(c), showing a cross section passing through the gripping portion 203H.

The gripping portion 203H extends from the Mylar sheet holding member 203a upstream and upward in the guide direction. The user can attach or remove the transport guide 203 to or from the glass frame 204 while gripping the gripping portion 203H with their fingers. When attaching the transport guide 203, the first engaging portion 203R is first inserted into the hole 204Ra of the first engaged portion 204R, and then the second engaging portion 203F is inserted into the gap 204Fc of the second engaged portion 204F, so that the engaging portions and the engaged portions engage with each other. When removing the transport guide 203, the transport guide 203 is operated in the reverse order of the above-mentioned procedure to release the engagement between the engaging portions and the engaged portions, and the transport guide 203 can be removed from the glass frame 204 (scanner unit 200).

As shown in FIG. 20H, the conveying guide 203 has a gripping portion 203H and a glass table 20
A light-shielding rib 203Ha is provided to prevent external light from entering through a space between the gripping portion 203H and the light-shielding rib 203H. The light-shielding rib 203Ha extends downward from the lower surface of the gripping portion 203H. The light-shielding rib 203Ha prevents external light from entering, and can suppress the occurrence of image defects during ADF reading.

In the first embodiment, as shown in FIG. 1, the ADF unit 300 is configured to be rotatable relative to the scanner unit 200 around a rotation axis that extends in the X direction at the rear end of the image reading device 100. That is, the second engaging portion 203F, the second engaged portion 204F, and the gripping portion 203H are disposed at the front end of the image reading device 100, which is the opening side of the ADF unit 300. With this configuration, when removing the transport guide 203, the user can easily see and grip the gripping portion 203H when the ADF unit 300 is opened.

In addition, with the above-mentioned configuration, the user can open the ADF unit 300 to an extent that allows a space for the operation of disengaging the second engaging portion 203F and the second engaged portion 204F to be freed, and can grasp the grip portion 203H. After that, the user can disengage the second engaging portion 203F and the second engaged portion 204F by lifting the transport guide 203 upward. Then, after the second engaging portion 203F and the second engaged portion 204F are disengaged, the transport guide 203 can be moved forward to pull out the first engaging portion 203R from the first engaged portion 204R to disengage, and the transport guide 203 can be removed from the glass frame 204. In other words, with the configuration of the first embodiment, the transport guide 203 can be efficiently removed with a small opening amount without opening the ADF unit 300 widely. In addition, when attaching the transport guide 203, the operation procedure is reversed from when removing it, so the transport guide 203 can be efficiently attached to the glass frame 204 with a small opening, without having to open the ADF unit 300 widely.

Next, a configuration for preventing erroneous installation of the transport guide 203 will be described. When a user attaches the transport guide 203 to the glass frame 204, if the user makes an error in the operation, the first engaging portion 203R may not be inserted into the hole 204Ra of the first engaged portion 204R, but may end up resting on the first engaged portion 204R. If the ADF unit 300 is forcibly closed in this state, the transport guide 203 and other components may be damaged. In the first embodiment, the scanner unit 200 is configured to form a sloped portion 204Rb above the first engaged portion 204R, so that if the transport guide 203 is incorrectly installed, the user can easily notice the incorrect installation.

Figures 21(a) to (f) are explanatory diagrams of the configuration for preventing erroneous installation of the transport guide 203. Figures 21(a) to (f) show the scanner unit 200 in a state in which the first engaging portion 203R and the first engaged portion 204R are not properly engaged and the transport guide 203 is not properly attached to the glass frame 204. Figure 21(a) is a top view showing a state in which the first engaging portion 203R is located on the inclined portion 204Rb of the first engaged portion 204R. Figure 21(b) is an enlarged view of the M portion of Figure 21(a) and shows the vicinity of the first engaged portion 204R. Figure 21(c) is a cross-sectional view taken along the line N-N of Figure 21(b). Figure 21(d) is a top view showing a state in which the first engaging portion 203R is located downstream of the first engaged portion 204R in the document guide direction (to the right in the figure). Figure 21(e) is an enlarged view of part P in Figure 21(d) and shows the vicinity of the first engaged part 204R. Figure 21(f) is a cross-sectional view taken along line Q-Q in Figure 21(e).

When the first engagement portion 203R gets on the inclined surface 204Rb, the first engagement portion 203R slides down the inclined surface 204Rb due to the weight of the transport guide 203. Then, as shown in Figure 21(d), the first engagement portion 203R moves downstream in the guide direction, and the transport guide 203 tilts when viewed from above the image reading device 100, and is significantly displaced from its normal installation position. In this way, the inclined surface 204Rb functions as a guide portion that moves the first engagement portion 203R so as to move the transport guide 203 to a position displaced from the correct installation position, and also as an application portion that applies a force to the transport guide 203 that causes the transport guide 203 to move in this manner. Therefore,
According to the configuration of the first embodiment, when the first engaging portion 203R is not properly engaged with the first engaged portion 204R, the posture of the transport guide 203 changes, making it possible for the user to clearly visually recognize that the transport guide 203 is not properly attached, and to urge the user to properly reattach the transport guide 203. As a result, incorrect attachment of the transport guide 203 can be suppressed.

When the second engaging portion 203F is engaged with the second engaged portion 204F, the transport guide 203 is pushed vertically downward. Therefore, even if the first engaging portion 203R is not resting on the sloped portion 204Rb and part of the first engaging portion 203R is hanging on the sloped portion 204Rb, the transport guide 203 is pushed downward and the first engaging portion 203R slides down the sloped portion 204Rb.

In order to obtain the effect of preventing erroneous installation of the transport guide 203 by the inclined surface portion 204Rb, at least a part of the inclined surface portion 204Rb is configured to overlap the hole portion 204Ra in the vertical direction. If the inclined surface portion Rb is configured to overlap 1/5 or more of the total width of the hole portion 204Ra in the X direction, it is particularly effective in preventing erroneous installation. In the first embodiment, a part of the upper surface of the first engaged portion 204R is made into a slope, but the entire surface may be formed as a slope. In addition, the inclined surface portion 204Rb is a slope that slopes downward toward the downstream side of the document guide direction, but a slope that slopes downward toward the upstream side of the document guide direction may be formed on the first engaged portion 204R. Furthermore, for example, the upper surface of the first engaged portion 204R may be formed with one slope, or may be formed with a pair of slopes to form a mountain shape.

Furthermore, when the transport guide 203 is improperly attached and in the state shown in FIG. 21(d), even if an attempt is made to close the ADF unit 300, the ADF unit 300 interferes with the transport guide 203 and does not close normally. Therefore, the user can recognize that the transport guide 203 is improperly attached by noticing that the ADF unit 300 does not close normally.

Next, the auxiliary attachment structure of the transport guide 203 will be described. Figures 22(a) and (b) are explanatory diagrams of the auxiliary attachment structure using the arm portion 203G of the transport guide 203. Figure 22(a) is a cross-sectional view of the transport guide 203 in the longitudinal direction when the second engaging portion 203F and the second engaged portion 204F are not properly engaged. Figure 22(b) is a cross-sectional view showing the state in which the ADF unit 300 is closed from the state shown in Figure 22(a).

In the X direction, the minimum width of the gap 204Fc is configured to be smaller than the width of the second engaging portion 203F. When engaging the second engaging portion 203F with the second engaged portion 204F, the second engaging portion 203F is pushed downward, the elastic portion 204Fa is deflected, and the width of the gap 204Fc is widened, so that the second engaging portion 203F is inserted into the gap 204Fc. On the other hand, if the user does not push the second engaging portion 203F toward the gap 204Fc, the second engaging portion 203F rides on the elastic portion 204Fa and the fixed portion 204Fb and is not inserted into the gap 204Fc. Also, if the conveying guide 203 is not pushed in sufficiently, the second engaging portion 203F is sandwiched between the elastic portion 204Fa and the fixed portion 204Fb and is suspended in the air, and the conveying guide 203 does not attach normally to the glass frame 204. Therefore, in the first embodiment, the image reading device 100 is configured so that if the second engagement portion 203F is not pushed into the gap 204Fc, the second engagement portion 203F is pushed into the gap 204Fc by closing the ADF unit 300.

The conveying guide 203 is formed with an arm 203G extending in the guide direction (X direction) downstream of the second engaging portion 203F in the guide direction. Also, an engagement assistant portion 302 that abuts against the arm 203G is provided on the lower surface side of the ADF unit 300 at a position corresponding to the arm 203G. In the first embodiment, in a state in which the second engaging portion 203F is placed on the elastic portion 204Fa and the fixed portion 204Fb, the engagement assistant portion 302 abuts against the arm 203G from above during the process in which the ADF unit 300 moves from an open state to a closed state relative to the scanner unit 200. Then, the conveying guide 203 is pressed downward, and the second engaging portion 203F is pushed into the gap portion 204Fc.

The elastic force of the elastic portion 204Fa acts most strongly on the second engagement portion 203F during the process of inserting the second engagement portion 203F into the gap portion 204Fc, before the second engagement portion 203F abuts against the glass table 202. Therefore, when the second engagement portion 203F is pushed into the gap portion 204Fc by a predetermined amount, it is automatically inserted into the gap portion 204Fc by the weight of the transport guide 203. Therefore, in the first embodiment, as shown in FIG. 22(b), when the transport guide 203 is normally attached and the ADF unit 300 is closed relative to the scanner unit 200, a gap is provided between the engagement auxiliary portion 302 and the arm portion 203G. This configuration can prevent the engagement auxiliary portion 302 from interfering with the arm portion 203G and causing the ADF unit 300 to close normally.

In this way, in the first embodiment, the direction in which the ADF unit 300 is closed and the direction in which the second engaging portion 203F is inserted are approximately parallel, the engagement assist portion 302 is provided as the abutting portion, and the arm portion 203G is provided as the abutted portion. Therefore, even if the second engaging portion 203F and the second engaged portion 204F are not properly engaged, the second engaging portion 203F engages with the second engaged portion 204F by closing the ADF unit 300, and the transport guide 203 is normally attached to the glass frame 204. As a result, the ease of attachment of the transport guide 203 can be improved while preventing erroneous attachment of the transport guide 203.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to Fig. 23. The second embodiment differs from the first embodiment in the configuration of the gripping portion of the transport guide 203. In the configuration of the second embodiment, the same reference numerals are used for the same components as those in the first embodiment, and the description thereof will be omitted.

In the second embodiment of the transport guide 203, the grip portion 203J extends upward from the second engagement portion 203F. Even in this configuration, the user can grip the grip portion 203J and operate the transport guide 203 to attach and detach the transport guide 203 in the same way as in the first embodiment.

The present invention is not limited to the configuration of the above-mentioned embodiment. For example, the first engaging portion 203R and the first engaged portion 204R may be configured such that the first engaging portion 203R is configured as a protrusion and the first engaged portion 204R is configured as a hole. Also, for example, the elastic portion 204Fa of the second engaged portion 204F may be configured to include a biasing member such as a spring. Also, for example, the transport guide 203 may engage with a member other than the glass frame 204 and be attached to the scanner unit 200. In this way, the attachment configuration of the transport guide 203 to the scanner unit 200 is not limited to the configuration of the above-mentioned embodiment, and various engagement configurations can be applied.

The disclosure of this embodiment includes the following configuration.
(Configuration 1)
A reading unit that reads an image of a document;
a transport unit configured to transport a document and be rotatable about a rotation axis relative to the reading unit;
a guide member that guides the document transported by the transport unit, the guide member being configured to be detachable from the reading unit;
An image reading apparatus for reading an image of a document while conveying the document, comprising:
In a direction perpendicular to the pivot axis, the side of the image reading device on which the pivot axis is located is defined as a first side, and the side opposite the first side is defined as a second side. An image reading device characterized in that a gripping portion for an operator to grip is provided on the second side of the guide member.
(Configuration 2)
the rotation shaft extends in a direction intersecting a width direction of the document to be transported,
2. The image reading device according to claim 1, wherein the gripping portion is provided at an end portion of the guide member in the width direction.
(Configuration 3)
the guide member has a first engagement portion provided at an end portion on a first side and a second engagement portion provided at an end portion on a second side;
3. The image reading device according to configuration 2, wherein the reading section is provided with a first engaged portion that engages with the first engaging portion and a second engaged portion that engages with the second engaging portion.
(Configuration 4)
one of the first engaging portion and the first engaged portion is a first protruding portion protruding in the width direction, and the other is a hole portion extending in the width direction,
The image reading device according to configuration 3, wherein one of the second engaging portion and the second engaged portion is a second protruding portion protruding in the width direction, and the other is a groove portion opening in the vertical direction.
(Configuration 5)
The minimum width of the groove is narrower than the width of the second protrusion,
The image reading device according to configuration 4, characterized in that the groove portion is composed of an elastic portion that abuts against the second protrusion during the process of inserting the second protrusion into the groove portion and elastically deforms in a direction in which the width of the groove portion increases.
(Configuration 6)
the second engagement portion is the second protrusion,
the second engaged portion is the groove portion configured by the elastic portion and a fixed portion facing the elastic portion,
6. The image reading device according to configuration 5, wherein the elastic portion and the fixed portion have upper surfaces each formed with a slope that slopes downward as it approaches the groove.
(Configuration 7)
The guide member has a contact portion,
The image reading device described in configuration 6, characterized in that the transport unit has an abutment portion that abuts against the abutted portion from above when the transport unit transitions from an open state to a closed state relative to the reading unit when the second engagement portion is placed on the elastic portion and the fixed portion.
(Configuration 8)
the first engagement portion is the first protrusion,
the first engaged portion is the hole portion,
The image reading device according to any one of configurations 4 to 7, characterized in that a slope is formed above the hole portion, the slope being downward as it approaches the upstream or downstream side in the document guide direction.
(Configuration 9)
the gripping portion protrudes upstream in a document guide direction so as to face the opposing surface of the reading portion in a vertical direction,
The image reading device according to any one of configurations 1 to 8, wherein a gap is formed between the gripping portion and the facing surface.
(Configuration 10)
10. The image reading device according to claim 9, wherein the guide member has a rib extending from a lower surface of the gripping portion toward the opposing surface.
(Configuration 11)
the second engagement portion is the second protrusion,
The image reading device according to any one of configurations 4 to 8, wherein the gripping portion is formed to protrude upward from the second engaging portion.
(Configuration 12)
12. A recording apparatus comprising the image reading apparatus according to any one of configurations 1 to 11, wherein an image read by the reading unit is recorded by a recording means.

100... Image reading device, 200... Scanner unit (reading unit), 300... ADF unit (transport unit), 302... Transport guide (guide member), 302H... Grip unit

Claims (12)

A reading unit that reads an image of a document;
a transport unit configured to transport a document and be rotatable about a rotation axis relative to the reading unit;
a guide member that guides the document transported by the transport unit, the guide member being configured to be detachable from the reading unit;
An image reading apparatus for reading an image of a document while conveying the document, comprising:
In a direction perpendicular to the pivot axis, the side of the image reading device on which the pivot axis is located is defined as a first side, and the side opposite the first side is defined as a second side. An image reading device characterized in that a gripping portion for an operator to grip is provided on the second side of the guide member. the rotation shaft extends in a direction intersecting a width direction of the document to be transported,
2. The image reading device according to claim 1, wherein the gripping portion is provided at an end portion of the guide member in the width direction. the guide member has a first engagement portion provided at an end portion on a first side and a second engagement portion provided at an end portion on a second side;
3. The image reading device according to claim 2, wherein the reading section is provided with a first engaged portion that engages with the first engaging portion, and a second engaged portion that engages with the second engaging portion. one of the first engaging portion and the first engaged portion is a first protruding portion protruding in the width direction, and the other is a hole portion extending in the width direction,
4. The image reading device according to claim 3, wherein one of the second engaging portion and the second engaged portion is a second protruding portion protruding in the width direction, and the other is a groove portion opening in the vertical direction. The minimum width of the groove is narrower than the width of the second protrusion,
5. The image reading device according to claim 4, wherein the groove is constituted by an elastic portion that elastically deforms in a direction in which the width of the groove increases by contacting the second protrusion during the process of inserting the second protrusion into the groove. the second engagement portion is the second protrusion,
the second engaged portion is the groove portion configured by the elastic portion and a fixed portion facing the elastic portion,
6. The image reading device according to claim 5, wherein the elastic portion and the fixed portion have upper surfaces each formed with a slope that slopes downward as it approaches the groove. The guide member has a contact portion,
The image reading device according to claim 6, characterized in that the transporting section has an abutment portion that abuts against the abutted portion from above when the transporting section transitions from an open state to a closed state relative to the reading section when the second engagement portion is placed on the elastic portion and the fixed portion. the first engagement portion is the first protrusion,
the first engaged portion is the hole portion,
5. The image reading device according to claim 4, wherein a slope is formed above the hole, the slope being inclined downward toward the upstream side or the downstream side in the document guide direction. the gripping portion protrudes upstream in a document guide direction so as to face the opposing surface of the reading portion in a vertical direction,
2. The image reading device according to claim 1, wherein a gap is formed between the gripping portion and the facing surface. The image reading device according to claim 9, characterized in that the guide member has a rib extending from the underside of the gripping portion toward the opposing surface. the second engagement portion is the second protrusion,
5. The image reading device according to claim 4, wherein the grip portion is formed so as to protrude upward from the second engagement portion. A recording device comprising the image reading device according to claim 1, and characterized in that the image read by the reading unit is recorded by a recording means.

Images