JP7743575B2 - Image reading device and image forming device - Google Patents

Description

The present invention relates to an image reading device that reads images on a sheet and an image forming apparatus equipped with the same.

Generally, image forming devices such as copiers and facsimiles are known to include an image reading device that optically reads images on documents. Previously, an image reading device was proposed that included a first document reading unit that reads the image on the first side of a document, and an automatic document feeder (ADF) that transports documents one sheet at a time (see Patent Document 1).

The ADF is provided with a second document reading unit that reads images on the second side of a document, and the first and second document reading units can read images on the first and second sides of a document transported along the transport path. The second document reading unit has a holding member that holds a light-emitting unit, a reflecting mirror, a condensing lens, a light-receiving unit, etc., and the holding member is configured to be movable in the document transport direction relative to the rotation axis of the document transport roller. The holding member is provided with a position adjustment unit, and by operating the position adjustment unit, the reading line of the second document reading unit is adjusted so that it is parallel to the rotation axis of the document transport roller.

JP 2009-290441 A

However, while the image reading device described in Patent Document 1 can adjust the reading line of the second document reading unit so that it is parallel to the rotation axis of the document transport roller, it cannot adjust the second document reading unit in the main scanning direction. As a result, there is a risk that the document being transported will fall outside the reading area of the second document reading unit, resulting in missing parts of the read image in the main scanning direction and a reduction in the quality of the read image.

Therefore, the present invention aims to provide an image reading device and an image forming device that can improve the quality of read images.

The present invention provides an image reading device comprising: an image reading unit having a first transparent member on which a sheet is placed; and a first reading unit that is provided movably along the first transparent member and reads an image of the sheet placed on the first transparent member; a loading tray on which sheets are placed; a device body having a transport path through which the sheets pass; a transport member that transports the sheets loaded on the loading tray in a transport direction; a second reading unit that extends in a longitudinal direction perpendicular to the transport direction and reads an image of the sheet transported by the transport member; and a holding unit that holds the second reading unit. and a sheet conveying device that is openable and closable relative to the image reading unit, wherein the first reading unit reads an image of a first side of the sheet conveyed by the conveying member while stopped at a predetermined position, and the second reading unit reads an image of a second side of the sheet conveyed by the conveying member, the second side being opposite to the first side, and the sheet conveying device has a first adjustment unit that adjusts the position of the second reading unit in the longitudinal direction relative to the device main body, and a second adjustment unit that adjusts the orientation of the second reading unit relative to the conveying direction .

This invention can improve the quality of scanned images.

1 is a schematic diagram showing an overall configuration of a printer according to an embodiment of the present invention; FIG. FIG. 4 is a perspective view showing a second scanner unit. FIG. FIG. 2 is a perspective view showing a reading unit and an operation unit. 1A is a perspective view showing the ADF with the cover closed, and FIG. 1B is a perspective view showing the ADF with the cover open. 1A is a schematic diagram showing a state in which the reading line and the leading edge line of the document are not parallel, and FIG. 1B is a schematic diagram showing a state in which the reading line and the leading edge line of the document are parallel. FIG. FIG. 4 is a perspective view showing a first adjustment unit and a holder. FIG. 1A is a schematic diagram showing a state in which an original is positioned outside the area of the reading line in the main scanning direction, and FIG. 1B is a schematic diagram showing a state in which an original is positioned within the area of the reading line in the main scanning direction. FIG. 10 is a side view illustrating an adjustment amount of the second scanner unit.

The image reading device and image forming device according to the present disclosure will be described below with reference to the drawings. Unless otherwise specified, the dimensions, materials, shapes, and relative positions of the components described in the following embodiments are not intended to limit the scope of application of this technology to those components.

[Printer Configuration]
First, the schematic configuration of a printer 101 as an image forming apparatus will be described with reference to FIG. 1. As shown in FIG. 1, the printer 101 includes a printer main body 101A and an image reading device 103. The image reading device 103, located above the printer main body 101A, includes a reading mechanism 30 and an ADF 1, as will be described in detail later, and optically scans an original D to read image information. The original D may be paper such as paper or an envelope, plastic film such as an overhead projector sheet (OHP), or a sheet of cloth. The image information converted into an electrical signal by the image reading device 103 is transferred to a control unit 132 provided in the printer main body 101A.

The printer main body 101A has an image forming unit 133 that forms an image on a sheet P, which is a recording medium, and a sheet feeding unit 34 and manual feeding unit 135 that feed sheets P to the image forming unit 133. The sheet feeding unit 34 has sheet storage units 137a, 137b, 137c, and 137d that can store sheets of different sizes. Sheets stored in each sheet storage unit are fed out by a pickup roller 32, separated one by one by a feed roller 33a and a retard roller 33b, and passed to the corresponding conveyance roller pair 131. The sheet P is then passed in sequence to multiple conveyance roller pairs 131 arranged along the sheet conveyance path, and conveyed to a registration roller pair 136.

The manual feed unit 135 has a manual feed tray 137e and a feed roller 138. A sheet P placed on the manual feed tray 137e by the user is fed into the printer main body 101A by the feed roller 138 and transported to the registration roller pair 136. The sheet P abuts against the nip of the stationary registration roller pair 136, forming a loop and correcting skew. The registration roller pair 136 then resumes transporting the sheet P in accordance with the progress of the image creation operation, which is the toner image formation process performed by the image forming unit 133.

The image forming section 133, which forms an image on the sheet P, is an electrophotographic image forming unit equipped with a photosensitive drum 121, which is a photosensitive member. The photosensitive drum 121 is rotatable in the direction in which the sheet P is transported, and a charger 118, an exposure device 123, a developer 124, a transfer charger 125, a separation charger 126, and a cleaner 127 are arranged around the photosensitive drum 121. The charger 118 uniformly charges the surface of the photosensitive drum 121, and the exposure device 123 exposes the photosensitive drum 121 to light based on image information input from the image reading device 103, etc., to form an electrostatic latent image on the drum.

The developing unit 124 contains a two-component developer containing toner and carrier, and develops the electrostatic latent image into a toner image by supplying charged toner to the photosensitive drum 121. The toner image carried on the photosensitive drum 121 is transferred to a sheet P transported from a pair of registration rollers 136 by a bias electric field formed by a transfer charger 125. The sheet P with the transferred toner image is separated from the photosensitive drum 121 by a bias electric field formed by a separation charger 126, and is transported by a pre-fixing transport unit 128 toward the fixing unit 129. Any residual toner and other deposits remaining on the photosensitive drum 121 without being transferred to the sheet P are removed by a cleaner 127, and the photosensitive drum 121 is prepared for the next image creation operation.

The sheet P transported to the fixing unit 129 is sandwiched between a pair of rollers and heated while being pressed, and the image is fixed by melting and fixing the toner. When image output is complete, the sheet P with the fixed image is discharged via a pair of discharge rollers 40 to a discharge tray 130 that protrudes outside the printer main body 101A. When an image is formed on the back side of the sheet P in double-sided printing, the sheet P that has passed through the fixing unit 129 has its front and back sides swapped by a reversing unit 139 and is transported to a pair of registration rollers 136 by a double-sided conveying unit 140. The sheet P then has an image formed again by the image forming unit 133 and is discharged to the discharge tray 130.

[Image reading device]
Next, the configuration of the image reading device 103 will be described with reference to Fig. 2. As shown in Fig. 2, the image reading device 103 is composed of a reading mechanism 30 having a first scanner unit 35, and an ADF 1 having a second scanner unit 201. The ADF 1 is supported by a hinge mechanism (not shown) located at the back of the figure so as to be able to open and close in the vertical direction relative to the reading mechanism 30.

In addition to the second scanner unit 201, the ADF 1 also includes a document loading tray 2 and a document transport unit 200. The document loading tray 2 supports documents D placed by the user. The document transport unit 200, which serves as a transport unit, feeds the documents D placed on the document loading tray 2 along the transport path R. The document transport unit 200 transports the documents D in the transport direction CD at the reading position of the second scanner unit 201 on the transport path R. Each element that makes up the image reading device 103 will be described below.

The first scanner unit 35 is an example of a reading unit that reads image information from the first side of the document D. The second scanner unit 201 is an example of a reading unit that reads an image from the second side of the document D, which is opposite the first side. The first scanner unit 35 and the second scanner unit 201 are configured to be able to simultaneously read both sides of the document D transported by the ADF 1. However, the first scanner unit 35 and the second scanner unit 201 do not always perform simultaneous reading of both sides of the document D, and are also able to read only one side.

The first scanner unit 35 includes a light source that irradiates light onto the original D, a mirror, a reduction optical system that guides reflected light from the original to a light receiving element and reduces the reflected light. In this embodiment, the light receiving element of the first scanner unit 35 is configured as a CCD (Charge Coupled Device) sensor, but may be configured as a CIS (Contact Image Sensor) sensor. Furthermore, the light receiving element of the second scanner unit 201 is configured as a CIS sensor, but may be configured as a CCD sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor.

As described below, the second scanner unit 201 has a light source consisting of an LED array arranged in a main scanning direction perpendicular to the transport direction CD of the original D, and a plurality of light receiving elements also arranged in the main scanning direction. Light emitted from the LED array and reflected by the original D is focused on each light receiving element via a lens and then photoelectrically converted by the light receiving elements. A light-transmitting platen glass 210 is disposed above the first scanner unit 35, which is positioned at a predetermined position, and a platen glass 212, which is a transparent member, is disposed below the second scanner unit 201.

The reading mechanism 30 is fixed to the top surface of the printer main body 101A (see Figure 1). As shown in Figure 2, a flatbed-type platen glass 211 is disposed on the top surface of the reading mechanism 30. The first scanner unit 35 is configured to be movable left and right in the figure, i.e., in the sub-scanning direction SD perpendicular to the main scanning direction MD (see Figure 3), by being driven by a belt or the like (not shown). The first scanner unit 35 can move in the sub-scanning direction SD from a predetermined position (the position shown) along the platen glass 211 over the entire length of the platen glass 211.

Next, the document transport unit 200 will be described in detail. The document transport unit 200 has a pickup roller 4, a feed roller 5, a retard roller 6, a pair of registration rollers 7, pairs of transport rollers 8 and 9, and a pair of discharge rollers 10. The pickup roller 4 is movable vertically relative to the upper surface of the document stacking tray 2, and begins feeding by contacting a document D on the document stacking tray 2. The feed roller 5 transports the document D received from the pickup roller 4 toward the pair of registration rollers 7. The retard roller 6 is pressed against the feed roller 5, and is driven to rotate in a direction opposite to the transport direction via a torque limiter, separating the documents D transported by the feed roller 5 into individual sheets.

With its rotation stopped, the registration roller pair 7 receives the downstream end (hereinafter referred to as the leading end) of the document D transported by the feed rollers 5, bending the document D to correct skew. The registration roller pair 7 then transports the document D, whose skew has been corrected, through the bent portion of the transport path R and hands it over to the transport roller pair 8. The transport roller pair 8 then feeds the document D toward the platen glasses 210 and 212, and hands it over to the downstream transport roller pair 9. At this time, the image on the first side of the document D is read by the first scanner unit 35 via the platen glass 210. The image on the second side of the document D is read by the second scanner unit 201 via the platen glass 212. The transport roller pair 9 then hands the document D over to the discharge roller pair 10. The discharge roller pair 10 then discharges the document D onto the document discharge tray 3.

The image reading device 103 configured in this manner reads images from original D in two modes: a flowing mode, in which the original image is scanned while the ADF 1 feeds the original D, and a fixed mode, in which the original placed on the platen glass 211 is scanned. The flowing mode is selected when the device detects original D placed on the original stacking tray 2, or when the user explicitly commands this via the operation panel of the printer main body 101A. In this case, the ADF 1 feeds original D one sheet at a time while the first scanner unit 35 is in a predetermined position facing the platen glass 210. Then, in the case of simultaneous double-sided scanning, both the first scanner unit 35 and the second scanner unit 201 irradiate scanning light onto the original D to scan it, or in the case of single-sided scanning, only one of them irradiates scanning light onto the original D to scan it. The image information photoelectrically converted into an electrical signal by the light-receiving element is transferred to the control unit 132 of the printer main body 101A.

On the other hand, fixed reading mode is selected when the device detects an original D placed on the platen glass 211, or when the user explicitly instructs this via the operation panel of the printer main body 101A. In this case, the first scanner unit 35 scans the original D placed on the platen glass 211 by emitting light while moving along the platen glass 211 in the sub-scanning direction SD. The image information converted into an electrical signal by the light-receiving element of the first scanner unit 35 is then transferred to the control unit 132 of the printer main body 101A.

The ADF 1 has a device main body 1a and a cover unit 208 that is supported on the device main body 1a so that it can be opened and closed around a pivot shaft 208a. The transport path R is made up of a first guide 207a provided on the device main body 1a and a second guide 208b provided on the cover unit 208. When processing a document that has jammed in the transport path R, the user opens the cover unit 208 to open the transport path R.

[Second scanner unit]
Next, the second scanner unit 201 as a reading unit will be described in detail with reference to Figures 3 to 5. As shown in Figures 3 to 5, the second scanner unit 201 has a reading section 199 having a plurality of light receiving elements arranged in the main scanning direction MD as its longitudinal direction, and a holding section 180 that stores and holds the reading section 199 therein, and extends in the main scanning direction MD.

The holding unit 180 has a holder 190 that supports the reading unit 199 from below, and a scanner cover 193 that covers the reading unit 199 from above. The reading unit 199 is stored in a space surrounded by the holder 190 and the scanner cover 193, and is configured to prevent foreign matter such as dust or paper powder from adhering to the light receiving element, lenses, and other optical components of the reading unit 199.

The holding unit 180 is supported on the device body 1a of the ADF 1 (see Figure 2) so that it can move up and down, i.e., in a direction perpendicular to the transport direction CD and the main scanning direction MD. The scanner cover 193 of the holding unit 180 is biased downward by a spring 194 that serves as a biasing member. As a result, the holding unit 180 is biased by the spring 194 so that it presses against the platen glass 212, which is located adjacent to the second scanner unit 201 in the up and down direction. Therefore, the second scanner unit 201 and the platen glass 212 can be positioned with high precision relative to each other even if there is any installation play in the platen glass 212.

[Scanning unit orientation adjustment]
Next, a description will be given of the configuration for adjusting the orientation of the reading unit 199. As shown in Figures 4 and 5, a boss 206a protruding upward is provided at one end of the holder 190 in the main scanning direction MD, i.e., the end toward the back of the device. A pivot support member 204 is attached to one end of the reading unit 199 in the main scanning direction MD, and an engagement member 203 is attached to the other end in the main scanning direction MD.

A hole 204a is provided in the pivot support member 204, and a boss 206a provided on the holder 190 passes through this hole 204a. In other words, the boss 206a, which serves as an axis, fits loosely into the hole 204a. With this configuration, the reading unit 199 is supported via the pivot support member 204 so that it can rotate around the boss 206a relative to the holder 190. Note that a boss may be formed on the pivot support member 204, and a hole may be formed in the holder 190 through which the boss passes.

As shown in Figures 4 and 5, one end 203a of the engagement member 203 protrudes outward from the holder 180, and the lower end 2022 of the operating unit 202 engages with this end 203a. An elongated hole 202a is formed in the upper end 2021 of the engagement member 203, extending in the adjustment direction of the reading unit 199, i.e., extending in an arc shape centered on the boss 206a. The engagement member 203 is positioned relative to the frame 206 of the device main body 1a by a fastener 209, such as a screw, passing through the elongated hole 202a and fastening it to the frame 206. Note that the elongated hole 202a does not necessarily have to be formed in an arc shape centered on the boss 206a; it may, for example, be shaped to extend linearly in the sub-scanning direction SD.

In this embodiment, the operating unit 202, the pivoting support member 204, the engaging member 203, and the fixture 209 constitute a second adjustment unit 205 that can rotate the reading unit 199 around the boss 206a and adjust the orientation of the reading unit 199. The boss 206a extends in the vertical direction, which is perpendicular to the conveying direction CD and the main scanning direction MD.

For example, as shown in FIG. 7(a), if the reading line L of the reading unit 199 and the line of the leading edge Da of the document D are not parallel, the service technician opens the cover unit 208 to expose the operation unit 202, as shown in FIGS. 6(a) and 6(b). The operation unit 202 is located outside the document transport area E of the transport path R in the main scanning direction MD (toward the front of the device). Also, as shown in FIG. 2, the operation unit 202 protrudes above the first guide 207a provided on the device main body 1a. Therefore, the service technician can easily access and operate the operation unit 202 simply by opening the cover unit 208, improving maintainability.

Then, the service technician removes the fixture 209 from the operation unit 202 and moves the operation unit 202 in the adjustment direction. This causes the reading unit 199 to rotate around the boss 206a, as shown in FIG. 5, and the orientation of the reading unit 199 is adjusted. As a result, as shown in FIG. 7(b), the reading line L of the reading unit 199 and the line of the leading edge Da of the document D become parallel, improving the quality of the read image. Note that in this embodiment, the orientation of the reading unit 199 refers to the position of the reading unit 199 in a plane parallel to the main scanning direction MD and the sub-scanning direction SD.

Once the orientation of the reading unit 199 has been adjusted, the service technician secures the fixing device 209 to the frame 206 while passing it through the long hole 202a, thereby fixing the position of the reading unit 199. The cover 208 is then closed, completing the adjustment of the orientation of the reading unit 199.

[Position Adjustment of Second Scanner Unit in the Main Scanning Direction]
Next, a configuration for adjusting the position of the second scanner unit 201 in the main scanning direction MD will be described. As shown in Figures 8 to 10, a first member 192 is fixed to a frame 206 of the apparatus main body 1a with screws 196. A second member 191 is attached to a holder 190 of the second scanner unit 201, and the second scanner unit 201 and the second member 191 are configured to be movable together in the main scanning direction MD. More specifically, the holder 190 is supported relative to the second member 191 so as to be movable up and down, and so as to be immovable in the main scanning direction MD and the conveying direction CD.

With the fastener 195, which serves as a connecting member, removed, the second member 191 is configured to be movable relative to the first member 192 in the main scanning direction MD. As shown in FIG. 9, the first member 192 is formed with a notch 192a, a round hole 192b, and an elongated hole 192c as openings extending in the main scanning direction MD. The notch 192a and the elongated hole 192c extend in the main scanning direction MD. The second member 191 is formed with female threads 191a and 191b at positions corresponding to the notch 192a and the round hole 192b, respectively. The second member 191 also has two protrusions 191c, 191c, which extend upward and pass through the elongated hole 192c.

When the round hole 192b and the female screw 191b are aligned, the first member 192 and the second member 191 are positioned at the target positions determined in the device design. That is, the second scanner unit 201 is usually positioned in the main scanning direction MD relative to the device main body 1a by passing a fastener 195 such as a screw through the round hole 192b and threading the fastener 195 into the female screw 191b. The elongated hole 192c and the protrusions 191c, 191c also function as a rotation stopper for the second member 191.

However, as shown in Figure 11(a), if the transported original D is misaligned in the main scanning direction MD with respect to the reading line L of the reading unit 199, it is necessary to adjust the position of the second scanner unit 201, which includes the reading unit 199, in the main scanning direction MD. In other words, if the original D is located outside the area of the reading line L in the main scanning direction MD, it is necessary to adjust the position of the second scanner unit 201 so that the original D is located within the area of the reading line L.

In this case, as shown in FIG. 9, the service technician removes the fixing device 195, for example, from the round holes 192b and 191b, and slides the second scanner unit 201 and second member 191 in the main scanning direction MD relative to the first member 192. Then, the service technician attaches the fixing device 195 by passing it through the notch 192a and the female screw 191a, thereby connecting the first member 192 and the second member 191 and positioning the second scanner unit 201, which has been adjusted in the main scanning direction MD.

In this embodiment, the first member 192, the second member 191, and the fixing device 195 constitute the first adjustment unit 220, which serves as an adjustment unit. The first adjustment unit 220 is provided on the device main body 1a, supports the second scanner unit 201 so that it can slide in the main scanning direction MD relative to the device main body 1a, and positions the second scanner unit 201, which has been adjusted in position in the main scanning direction MD.

This completes the adjustment of the position of the second scanner unit 201 in the main scanning direction MD, and as shown in Figure 11 (b), the transported document D is now within the range of the reading line L of the reading unit 199 in the main scanning direction MD. This reduces the chance of the scanned image of the document D being missing in the main scanning direction MD, improving the quality of the scanned image.

In this embodiment, as shown in FIG. 6(b), the first member 192 and the second member 191 can be accessed by removing the front cover 230 located at the front of the device. Furthermore, after the position of the second scanner unit 201 in the main scanning direction MD has been adjusted, the orientation of the reading unit 199 is also typically adjusted using the method described above.

In this embodiment, the first adjustment section 220 is composed of a first member 192, a second member 191, and a fixing device 195, and the holder 190 of the second scanner unit 201 is not directly fixed to the frame 206 of the device main body 1a. This is because the position of the second scanner unit 201 in the main scanning direction MD can be adjusted by aligning the first member 192 and the second member 191, which are relatively small members, thereby saving space.

Also, as shown in FIG. 12, for example, the operation unit 202 engages with the engagement member 203 of the second scanner unit 201 so that they overlap by a distance L11 in the main scanning direction MD. Also, in the main scanning direction MD, the engagement member 203 is positioned with a gap of a distance L12 from the wall portion 202b of the operation unit 202.

In this case, it is preferable that the adjustment amount L10 of the second scanner unit 201 by the first adjustment section 220 be equal to or less than the distance L11 and the distance L12. More specifically, when moving the second scanner unit 201 toward the rear of the device in the main scanning direction MD, it is preferable that the adjustment amount L10 be equal to or less than the distance L11. This allows the engagement between the operation section 202 and the engagement member 203 to be maintained.

Furthermore, when moving the second scanner unit 201 toward the front of the device in the main scanning direction MD, it is preferable that the adjustment amount L10 be equal to or less than the distance L12. This allows the operating unit 202 to be fixed to the frame 206 while remaining engaged with the engaging member 203.

As described above, in this embodiment, the first adjustment unit 220 is configured to allow the position of the second scanner unit 201 to be adjusted in the main scanning direction MD. This reduces the chance of the scanned image of the original D being missing in the main scanning direction MD, improving the quality of the scanned image.

The second adjustment unit 205 is also configured to adjust the orientation of the reading unit 199. This allows the position of the reading unit 199 to be adjusted so that the reading line L of the reading unit 199 and the line of the leading edge Da of the document D are parallel, thereby improving the quality of the read image.

In this embodiment, the first adjustment unit 220 is configured from the first member 192, the second member 191, and the fixing device 195, but this is not limiting. For example, the first member 192 may be omitted, and the second member 191 may be fixed directly to the frame body 206. Alternatively, the first member 192 and the second member 191 may be omitted, and the holder 190 may be fixed directly to the frame body 206. Furthermore, the first adjustment unit 220 may be configured to support the reading unit 199, rather than the holder 190, so that it can slide in the main scanning direction MD, and to position the reading unit 199 after it has been adjusted in position in the main scanning direction MD.

Furthermore, the fasteners 195, 209 are not limited to screws or bolts, and may have any configuration that connects two components. For example, the fasteners 195, 209 may be configured with claws, snap fits, hooks, etc.

In addition, in the above-described embodiment, the notch 192a is formed in the first member 192 and the female thread 191a is formed in the second member 191, but this is not limited to this. For example, the notch 192a may be formed in the second member 191 and the female thread 191a may be formed in the first member 192. For example, the notch 192a may be formed in both the first member 192 and the second member 191. In other words, the notch 192a may be formed in at least one of the first member 192 and the second member 191. The notch 192a may also be an elongated hole or a simple groove.

Furthermore, while all of the above-described embodiments have been described using an electrophotographic printer 101, the present invention is not limited to this. For example, the present invention can also be applied to an inkjet image forming device that forms an image on a sheet by ejecting ink liquid from nozzles.

1a: Device body / 180: Holding unit / 191: Second member / 192: First member / 192a: Opening (notch) / 194: Spring / 195: Connecting member (fixture) / 199: Reading unit / 200: Transport unit (document transport unit) / 201: Reading unit (second scanner unit) / 204a: Hole / 205: Second adjustment unit / 206a: Shaft (boss) / 207a: First guide / 208: Cover / 208b: Second guide / 212: Transparent member (platen glass) / 220: Adjustment unit, first adjustment unit / CD: Transport direction / R: Transport path

Claims (11)

an image reading unit including a first transparent member on which a sheet is placed, and a first reading unit that is provided movably along the first transparent member and reads an image of the sheet placed on the first transparent member;
a sheet conveying device including: a device body having a stacking tray on which sheets are stacked, a conveying path through which the sheets pass; a conveying member that conveys the sheets stacked on the stacking tray in a conveying direction; a second reading unit that extends in a longitudinal direction perpendicular to the conveying direction and reads an image on the sheet conveyed by the conveying member; and a holding unit that holds the second reading unit, the sheet conveying device being provided so as to be openable and closable relative to the image reading unit;
Equipped with
the first reading unit reads an image on a first surface of the sheet conveyed by the conveying member while being stopped at a predetermined position;
the second reading unit reads an image on a second side of the sheet conveyed by the conveying member, the second side being opposite to the first side;
the sheet conveying device includes a first adjustment unit that adjusts the position of the second reading unit in the longitudinal direction relative to the device body, and a second adjustment unit that adjusts the orientation of the second reading unit with respect to the conveying direction.
An image reading device characterized by: the first adjustment unit supports the holding unit together with the second reading unit so as to be slidable in the longitudinal direction relative to the device body, and positions the holding unit whose position has been adjusted in the longitudinal direction;
2. The image reading device according to claim 1, wherein: the first adjustment unit includes a first member fixed to the device body, a second member attached to the holding unit and movable relative to the first member in the longitudinal direction, and a connecting member connecting the first member and the second member.
3. The image reading device according to claim 1, wherein the image reading device is a scanning device. At least one of the first member and the second member has an opening extending in the longitudinal direction and through which the connecting member passes.
4. The image reading device according to claim 3, wherein: the second adjustment unit is capable of rotating the second reading unit about a rotation axis extending in a direction perpendicular to the conveying direction and the longitudinal direction, and adjusting an orientation of the second reading unit.
5. The image reading device according to claim 1, wherein the image reading device is a scanning device. the holding portion has a shaft extending concentrically with the rotation axis,
The second reading unit has a hole that fits loosely onto the shaft.
6. The image reading device according to claim 5, wherein: the device body has a first guide,
the sheet transport device has a second guide that forms the transport path together with the first guide, and a cover portion that is supported on the device body so as to be openable and closable;
the second adjustment unit includes an operation unit that protrudes above the first guide and is operated when rotating the second reading unit,
7. The image reading device according to claim 5, wherein the image reading device is a scanning device. the sheet conveying device,
a second transparent member provided adjacent to the second reading unit in a direction perpendicular to the conveying direction and the longitudinal direction;
a biasing portion that biases the holding portion toward the second transparent member in the orthogonal direction,
7. The image reading device according to claim 1, wherein the image reading device is a scanning device. the second reading unit is stored inside the holding unit;
9. The image reading device according to claim 1, wherein the image reading device is a scanning device. the first adjustment unit is capable of adjusting a position of a scanner unit including the second reading unit and the holding unit in the longitudinal direction relative to the device body,
the second adjustment unit is capable of adjusting an orientation of the second reading unit with respect to the holding unit in the scanner unit;
10. The image reading device according to claim 1, wherein the image reading device is a scanning device. An image reading device according to any one of claims 1 to 10 ;
an image forming unit that forms an image on a sheet,
An image forming apparatus characterized by: