JP2002051196A - Image reader and image forming device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To read the images of both sides of a manuscript with only one read ing sensor by removing a reversal path for inverting surface of a manuscript. SOLUTION: When a manuscript D is carried by first carriage roller 51 which rotates positively in the arrow direction, a reading sensor 11 reads the image of a bottom Dd of the manuscript. When a second manuscript sensor 42 detects an end Db of the manuscript, the rotation of the first carriage roller 51 and the second carriage roller 52 is once stopped, and the reading sensor 11 rotates 180 deg. together with a rotating carriage path 12, and then stops. When the manuscript D is carried in the reverse direction by the reverse rotation of the first carriage roller 51 and the second carriage roller 52, this time the reading sensor 11 in a position of reading the image of the topside DC of the manuscript reads the image of a topside Dc. When the reading of the image is finished, the reading sensor 11 rotates again to the position in Fig. 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided image reading apparatus for reading an image on a first surface and a second surface of a document conveyed along the document conveyance path by a reading sensor provided on the document conveyance path for conveying the document. The present invention relates to a reading device and an image forming apparatus including the duplex reading device.

[0002]

2. Description of the Related Art As a conventional double-sided reading apparatus capable of reading images on both sides of a document, for example, Japanese Unexamined Patent Publication No.
There is one described in Japanese Patent Application Laid-Open No. 0-207979.
In this double-sided reading device, a form set in a paper feeding unit is conveyed to a reading unit by a supply unit, and the reading unit optically scans and reads an image of a front surface of the form first, digitizes the image data and converts the image data into an image. Store in buffer.

[0003] Then, the form on which the image on the front surface has been scanned is conveyed to the first reversing section and then conveyed to the second reversing section through the pointed section, and again with the front and back reversed. It is transported to the reading unit. Then, the image on the back side is optically scanned by the reading unit, and the read image data is digitized and stored in the image buffer. In addition, for example, Japanese Unexamined Patent Application Publication No. 11-1
As described in Japanese Patent No. 27350, a surface engineering unit for reading a surface white reference across a document conveying path;
Some have a backside engineering unit that reads the backside white reference.

[0004]

However, in the case of the former two-sided reading apparatus, the form after reading the image on the front surface is transported from the first reversing section to the second reversing section through the pointed section. The first and second reversing units, the reversing unit, and the second reversing unit for reversing the form to the back side since the front and back are reversed to read (scan) the image on the back. Therefore, there is a problem that the cost increases because the transport path and the transport drive system are complicated by that amount.

[0005] Further, there is another problem that the size of the entire apparatus is increased due to the transport path for inverting the form to the back side. Further, in such a configuration in which the transport path for reversing the front and back is provided, there is a drawback that a long time is required for a document such as a document to pass through the transport path, so that a long processing time is required.

In the case of the latter double-sided reading apparatus, the engineering units for reading are provided on both the upper and lower sides of the document conveying path, so that the optical unit is twice as large as in the case of a single optical system. In addition to the cost, the space for accommodating the optical system must be doubled, so that the size of the apparatus increases.
In addition, since the reading process of the images on both sides of the document is performed at substantially the same timing, the processing speed of the electric and software is increased, and the cost is increased accordingly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and does not provide a reversing path for reversing the front and back of a document. It is an object of the present invention to be able to read an image and to reduce the size and cost.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a first sensor of a document conveyed on a document conveying path is provided by a reading sensor provided on the document conveying path for conveying the document.
In a double-sided reading apparatus configured to read an image on a second side and an image on a second side, a rotating member rotated by a driving source is provided in the document conveying path, and a part of the document conveying path is used as a rotating conveying path on the rotating member. The reading sensor is attached to the rotating member so as to be able to read an image on one surface of the document passing through the rotating conveyance path, and the rotation sensor is attached to the rotating member, and the document is conveyed to the rotating member on the upstream side of the document conveying path in the forward direction. A first transport roller, and a second transport roller on the downstream side in the document transport forward direction, and the first transport roller and the second transport roller.
Are provided rotatably in both forward and reverse directions by a roller drive source.

An image on the first surface of the original conveyed in the forward direction by the first conveying roller rotated in the forward direction is read by the reading sensor, and the original is rotated in the forward direction. After the document is conveyed in the forward direction by the second conveyance roller and the rear end passes through the rotary conveyance path, the drive source is driven to rotate the rotation member 180 degrees together with the reading sensor, and then the Means are provided for rotating the first transport roller and the second transport roller in opposite directions to transport the document in the reverse direction, and for reading the image on the second surface of the document by the reading sensor.

In the double-sided reading apparatus, the rotary conveyance path provided in the rotary member is provided so as to be close to the reading glass for covering the reading side of the reading sensor and to the reading glass on the upstream side in the document conveying forward direction. A reading entrance guide plate,
A reading exit guide plate provided in the vicinity of the downstream side, and a reading reference guide plate which is disposed opposite to the reading entrance guide plate and the reading exit guide plate and the reading glass at a predetermined interval. The total length of the reading reference guide plate in the document conveying direction is substantially equal to the distance from the entrance of the reading entrance guide plate to the exit of the reading exit guide plate, and the rotation center of the rotating member is set in the document conveying direction of the reading reference guide plate. It is effective to set it at an intermediate position of.

[0011] Further, a reading glass for covering a reading side of the reading sensor may be provided on a rotating conveyance path provided in the rotating member.
A reading reference guide plate disposed opposite to the reading glass at a predetermined interval so that the entire length of the reading glass in the document conveying direction substantially coincides with the total length of the reading reference guide plate in the document conveying direction. The rotation center of the rotation member may be set at an intermediate position of the reading reference guide plate in the document conveyance direction. In this case, a guard member for preventing the reading glass from being damaged may be provided on the surface of the rotating member opposite to the surface of the reading glass facing the document.

Further, the double-sided reading device is provided with storage means for storing the image data read by the reading sensor, and the storage means stores the image data obtained by reading the image on the first side of the document from the start line. It is preferable to provide a means for storing the image data obtained by reading the image of the second surface of the document from the last line. Further, the present invention provides an image forming apparatus provided with any one of the double-sided reading devices.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing the vicinity of a rotary conveyance path of a two-sided reading device according to an embodiment of the present invention. FIG. 2 is an overall configuration diagram showing an example of an image forming apparatus provided with the two-sided reading device. FIG. 4 is a schematic view showing a state in which a reading sensor provided in the double-sided reading apparatus of FIG. 1 is rotated by 180 degrees, and FIG. 4 is a side view showing a reading sensor rotating mechanism for rotating the reading sensor.

The image forming apparatus shown in FIG. 2 transfers a document D from a document tray 2 provided on an upper portion of the apparatus main body 1 to a document conveying path 3.
To the double-sided reading device 10, where the reading sensor 11 reads an image on the lower first surface of the document D in FIG.
The read image data is stored in an original image information memory unit 63 (FIG. 5) described later.

When the trailing end of the document D passes through the rotary transport path 12 of the duplex reading device 10, the rotary transport path 12
Is rotated 180 degrees together with the reading sensor 11, the original D is conveyed in the opposite direction to the right in FIG.
2, the image on the upper second surface is read by the reading sensor 11 at a position rotated by 180 degrees from the position shown in FIG. 2, and the read image data is similarly stored in the document image information memory unit 63. . Thereafter, the document D is moved straight and discharged to the document stacking tray 13. And, the rotary conveyance path 1
2 is again rotated by 180 degrees together with the reading sensor 11 to return them to the position shown in FIG.

In this image forming apparatus, when an image forming operation is started, the photosensitive drum 5 rotates in the direction of arrow A in FIG. 2, and the surface of the photosensitive drum 5 is uniformly charged by the charging charger 4. You. Further, laser light is emitted from the laser light emitting device 15 at a predetermined timing, and the laser light is emitted from the optical system 1.
6, the surface of the photosensitive drum 5 is exposed to light in accordance with image data, and an electrostatic latent image is formed thereon. The electrostatic latent image is visualized by the toner attached by the developing device 6.

Transfer paper P is fed from a paper feed unit 7 provided at the lower portion of the apparatus main body 1, and is temporarily stopped by a pair of registration rollers 8, and then coincides with the image on the photosensitive drum 5. The transfer roller 9 is conveyed toward a certain transfer position at a precise timing. Then, the toner image on the photosensitive drum 5 is transferred to the transfer paper P by the transfer roller 9, and the transfer paper P is fixed by the fixing device 22 by the transport belt 17.
Where the toner image is fixed.

Here, when the double-sided image forming mode is selected, the transfer paper P is conveyed to the double-sided device 25, where the transfer paper P is turned upside down and then conveyed again to the photosensitive drum 5, and this time the back side is still The next image is formed on the surface on which no image is formed, and then the transfer paper P is moved straight and discharged to the discharge tray 23. The surface of the photosensitive drum 5 on which the transfer and the separation have been completed is cleaned by the cleaning device 24.
Removes the residual toner, and prepares for the next image formation.

Next, the duplex reading apparatus 10 will be described in detail. As shown in FIG. 1, the double-sided reading apparatus 10 includes a drive motor 30 (see FIG.
And a pair of reading side plates 35 and 36 (see also FIG. 4) which are rotating members rotated by the rotating conveyance path 12.
Are provided integrally.

A reading sensor 11 is attached to the reading side plates 35 and 36 so as to be able to read an image on one side of the document passing through the rotary conveyance path 12, and is attached to the reading side plates 35 and 36 of the document conveyance path 3. A first conveyance roller 51 including a pair of a first document detection sensor 41 for detecting a document conveyed in the document conveyance path 3 and an upstream side in the document conveyance forward direction (right side in FIG. 1). A second document detection sensor 42 for detecting a document conveyed through the document conveyance path 3 and a second conveyance roller 52 including a pair of rollers are provided on the downstream side in the document conveyance direction. And the second transport roller 52 are provided rotatable in both forward and reverse directions by a drive motor 45 (FIG. 5), which is a roller drive source described later.

The double-sided reading device 10 is adapted to transfer a document conveyed in a document conveying forward direction to the left in FIG. 1 by a first conveying roller 51 rotated in the forward direction indicated by an arrow in FIG. The image on the first surface (the lower surface in FIG. 1) is read by the reading sensor 11, and the document is conveyed in the forward direction of the document by the second conveying roller 52 rotated in the forward direction. After the end portion Db has passed through the rotary conveyance path 12, the above-described driving source is driven to rotate the reading side plates 35 and 36 together with the reading sensor 180 by 180 degrees, and then the first conveyance roller 51 and the second conveyance roller 52 Are rotated in the opposite direction (the direction opposite to the arrow in FIG. 1) to convey the document in the reverse direction, and the reading sensor 11 reads the image of the second surface (the upper surface in FIG. 1) of the document. Central processing unit (CPU) 60 to perform It is provided which will be described later) in FIG.

The rotary transport path 12 of the duplex reading device 10
A reading glass 28 covering the reading side (upper side in FIG. 1) of the reading sensor 11, a reading entrance guide plate 18 provided close to the reading glass 28 on the upstream side in the document conveying forward direction, and a downstream side Exit guide plate 1 provided close to
9 and a reading reference guide plate 14 which is opposed to the reading entrance guide plate 18, the reading exit guide plate 19, and the reading glass 28 at predetermined intervals.

[0023] Then, substantially matched to the distance L ₂ until the exit of the outlet guide plate 19 read from the entrance of the inlet guide plate 18 reading the overall length L ₁ of the document conveying direction of the reading reference guide plate 14, the reading side plates 35 and 36 Is set at an intermediate position of the reading reference guide plate 14 in the document conveying direction.

Reading sensor 11 and reading reference guide plate 14
Are integrally fixed to the left and right reading side plates 35 and 36 by, for example, screws. A shaft 33 is fixed to the reading side plates 35, 36, and both ends 33a, 33b of the shaft 33 project outside the reading side plates 35, 36 by a predetermined amount.

Then, the end 33a is connected to the main body side plate 37.
And the other end 33b is rotatably supported by a main body side plate 38 via a bearing (not shown). The left and right reading side plates 35, 36 are fixed to the outer surface side thereof with two shafts such that their centers of rotation coincide with each other, and the two shafts are respectively fixed by the left and right main body side plates 37, 38. It may be rotatably supported.

At one end 33b of the shaft 33, a reading sensor gear 31 is fixed, and the reading sensor gear 31 is fixed to a rotating shaft of a drive motor 30 that fixes the main body to the main body side plate 38. Are engaged. Therefore, by rotating the drive motor 30 forward,
The reading sensor 11 at the position shown in FIG. 1 is rotated 180 degrees in the clockwise direction in FIG. 1, and the reading sensor 11 and the reading entrance guide plate 18 and the reading exit guide plate 19 are moved to the position shown in FIG. It can be rotated and stopped as one.

Further, the drive motor 30 is rotated, and the reading sensor 11 at the position shown in FIG. 3 is further rotated clockwise in FIG. 3 by 180 degrees, and the reading reference guide is moved to the position shown in FIG. It can be returned together with the plate 14, the reading entrance guide plate 18 and the reading exit guide plate 19.

When the document D is conveyed in the direction indicated by the arrow B from the document conveying path 3 shown in FIG. 1, the document D is driven by a drive motor 45 (FIG. 5). The sheet is conveyed toward the space between the front entrance guide plates 43 and 44 by the first conveyance roller 51 rotating forward in the direction indicated by the arrow 1.

Then, the original D is placed on the front guide plate 4.
When the document D is conveyed between the document D and the document D, the first document detection sensor 41 detects the end Da of the document D on the leading end side. Then, the reading sensor 11 at the position shown in FIG.
The reading of the image on the lower surface Dd of the document D conveyed between the reading reference guide plate 14 and the reading glass 28 is started. The reading of the image by the reading sensor 11 ends when a predetermined time has elapsed after the first document detection sensor 41 detects the end Db on the rear end side of the document D.

After that, when the second document detection sensor 42 provided on the transport path on the downstream side of the duplex reading device 10 detects the rear end Db of the document D, the drive motor 45
By stopping the rotation of FIG. 5, the rotations of the first transport roller 51 and the second transport roller 52 are temporarily stopped.

Then, by rotating the drive motor 30, the reading sensor 11 at the position shown in FIG. 1 is shown in FIG. 3 integrally with the reading reference guide plate 14, the reading entrance guide plate 18 and the reading exit guide plate 19. Rotate 180 degrees to the position,
Stop at that position.

Then, the original D is conveyed rightward in FIG. 3 by rotating the drive motor 45 in the reverse direction. Then, the end Db on the front end side of the original D (the rear end so far)
Is detected by the second document detection sensor 42, the reading sensor 11 starts reading an image of the upper surface Dc of the document D. When the second document detection sensor 42 detects the rear end portion Da of the document D, the reading sensor 1
The reading by 1 is completed. When the reading of the image on the upper surface Dc is completed, the driving motor 30 is rotated again to return the reading sensor 11 and the like to the position shown in FIG.

Thus, the double-sided reading device 10
Reads the images formed on both sides of the original D, and at this time, the image on the lower surface Dd of the original D is read from the end Da of the original (the original leading end when the original D is transported in the forward direction). On the other hand, the image on the upper surface Dc side is read from the end Db of the original (the rear end of the original D when the original D is transported in the forward direction).

Even if the image on the upper surface Dc side of the document D is read from the trailing edge Db of the document D when the document D is transported in the forward direction, the read image data is stored in the memory unit. When doing this, since the data is saved from the bottom row of the memory unit and sequentially stored in the upper row, it is possible to correct the data arrangement of the original in which the image information is read upside down on the upper side and the lower side. it can. This will be described in detail later.

Next, a control system of the image forming apparatus shown in FIG. 2 will be described with reference to FIG. In the control system of the image forming apparatus, a central processing unit (CPU) 60 includes a first document detection sensor 41, a second document detection sensor 42, a document image information memory 63, an operation port 6 through a data bus 50.
4, the line buffer 65, the reading sensor 11, the drive motor 30, the drive motor 45, the modem 66, the RO
M67 and a page counter 68. The modem 66 is connected to a network control unit (NCU) 69 for connecting to an external communication line.

In this embodiment, the document image information memory 63 functions as a storage unit for storing the image data read by the reading sensor 11. Also, the central processing unit (CPU) 60 causes the document image information memory unit 63 to store the image data obtained by reading the image of the first surface (lower surface Dd in FIG. 3) of the document from the start line, and store the image data in the second surface (FIG. 3). Upper surface Dc)
The image data obtained by reading the above image functions as a means for storing the image data from the last line.

FIG. 6 is a conceptual diagram for explaining data processing when an image on the lower surface side of the document is read, and FIG. 7 is a conceptual diagram for explaining data processing when an image on the upper surface side of the document is read. It is. When reading the image on the lower surface Dd side of the document D shown in FIG. 1, the double-sided reading device 10 reads from the end Da of the document D (the leading end of the document D when the document D is transported in the forward direction) as described above. As shown in FIG. 6, the data is sequentially stored (accumulated) in the lowermost row of the original image information memory section 63 from the top row. When the stored image data is transmitted or transferred to the recording side, the top line stored in the original image information memory unit 63 is set as the first line, and the second and subsequent lines are set as the second and subsequent lines, and are sequentially output. I will do it.

When reading an image on the upper surface Dc side of the original D, the end Db of the original D (the original D
The document is read from the rear end side of the original in the forward conveyance of the original image), and is stored (accumulated) sequentially from the bottom row of the original image information memory unit 63 to the upper row as shown in FIG.

When the stored image data is transmitted or transferred to the recording side, the top line stored in the original image information memory unit 63 is set as the first line, and the second and subsequent lines are set as the second and subsequent lines. , In order. As described above, when the image on the upper surface Dc side of the document D is read, the image information (image data) is arranged upside down and corrected, so that the read data stored in the document image information memory unit 63 is transmitted, When the stored image data is transferred to the recording side, the output order can be made uniform by setting the uppermost line of the stored image data as the first line and setting the second and subsequent lines as the second line and thereafter.

FIG. 8 is a schematic structural view similar to FIG. 1 showing an embodiment of a double-sided reading apparatus in which the rotary transport path is constituted by a reading glass and a reading reference guide plate whose length is substantially the same as that of FIG. FIG. 2 is a schematic diagram showing a state in which a reading sensor provided in the double-sided reading device is rotated by 180 degrees, and portions corresponding to those in FIG. 1 are denoted by the same reference numerals.

The double-sided reading apparatus according to the present embodiment includes a rotary conveying path 1 provided on reading side plates 35 and 36 which are rotating members.
2 'is composed of a reading glass 28' that covers the reading side of the reading sensor 11 and a reading reference guide plate 14 that is arranged opposite to the reading glass 28 'at a predetermined interval. substantially to match the total length L ₃ of the original conveying direction the full length L ₁ of the document conveying direction of the reading reference guide plate 14, reads the rotational center O of the side plates 35 and 36, an intermediate position of the document conveying direction of the reading reference guide plate 14 I have to.

The rotation radius r ₁ from the rotation center O to the farthest position of the sensor case 21 covering the reading sensor 11 and the rotation radius r ₂ from the rotation center O to the end of the reading reference guide plate 14. And the total length of the reading glass 28 ′ is set to be substantially equal to the radius of rotation r ₁ × 2, so that the radius of rotation r (r ≒ r ₁ ≒ r ₂ ) is as small as possible. The size of the rotating section including the rotary conveying path 12 'is made as small as possible.

[0043] Also, double-sided reading apparatus according to this embodiment, 'since the total length L ₃ of the large glass 28 reading the time of maintenance and the like' reading glass 28 reading the lateral width of the sensor case 21 of the sensor 11 touches the There is a risk of damaging it. Therefore, as shown in FIG. 10, for example, the reading glass 2 ′ is placed on the side surface 28 a of the sensor case 21 opposite to the surface facing the original of the reading glass 28 ′.
8 ′ rib-shaped guard member 54 for preventing breakage
55, the guard members 54, 5
5 may be provided so as to rotate integrally with the reading side plates 35 and 36 (FIG. 8).

As shown in FIG. 9, this double-sided reading device is also driven by a driving motor (see the driving motor 30 in FIG. 4), as shown in FIG. Is rotated 180 degrees together with the reading sensor 11, the reading glass 28 ', the reading reference guide plate 14, and the like.

[0045]

As described above, according to the present invention, the following effects can be obtained. According to the double-sided reading device of the first aspect and the image forming apparatus of the sixth aspect, the rotary member is provided with the rotary transport path and the reading sensor that constitute a part of the document transport path, and the read sensor rotates 180 degrees together with the rotary member. Therefore, the image on both sides of the document can be read by one reading sensor without turning the document upside down. Thereby, the entire apparatus can be reduced in size and cost.

According to the double-sided reading apparatus of the second aspect, the rotary conveyance path is constituted by the reading glass, the reading entrance guide plate, the reading exit guide plate, and the reading reference guide plate, and the reading reference guide plate in the document conveying direction is provided. Make the overall length approximately equal to the distance from the entrance of the reading entrance guide plate to the exit of the reading exit guide plate,
Since the center of rotation of the rotating member that rotates integrally with the rotary transport path is set at the intermediate position of the reading reference guide plate in the document transport direction, the total width of the rotary transport path in the document transport direction is twice the rotation radius of the rotary transport path. In addition, the rotation trajectory of the rotary conveyance path can be minimized. Thereby, further miniaturization can be achieved.

According to the third aspect of the present invention, the rotary conveying path is constituted by the reading glass and the reading reference guide plate which is arranged opposite to the reading glass at a predetermined interval,
Since the entire length of the reading glass in the document conveying direction substantially coincides with the entire length of the reading reference guide plate in the document conveying direction, and the rotation center of the rotating member is set at an intermediate position in the document conveying direction of the reading reference guide plate, The rotation locus can be minimized to reduce the size of the entire apparatus, and furthermore, the rotating conveyance path is constituted only by a reading glass and a reading reference guide plate, and a guide plate is connected in the middle of the rotation conveyance path. Since there is no step portion, conveyance jam in the rotary conveyance path can be prevented, so that high reliability can be obtained.

According to the double-sided reading device of the fourth aspect, the image data of the first surface of the document read from the leading edge of the document by the reading sensor is stored in the storage means from the start line and read from the trailing edge of the document. Since the image data of the second surface is stored from the last row, it can be passed as normal image data when outputting the data to the transmission or recording side.

According to the fifth aspect of the present invention, even if the entire length of the reading glass in the document conveying direction is set to be substantially equal to the total length of the reading reference guide plate in the document conveying direction, the reading glass can be used as a guard member. Therefore, it is possible to prevent the reading glass from being damaged during maintenance or the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing the vicinity of a rotary conveyance path of a two-sided reading apparatus according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram illustrating an example of an image forming apparatus including the double-sided reading device.

FIG. 3 is a schematic diagram showing a state in which a reading sensor provided in the double-sided reading device of FIG. 1 is rotated by 180 degrees;

FIG. 4 is a side view showing a reading sensor rotating mechanism for rotating the reading sensor.

FIG. 5 is a block diagram illustrating a control system of the image forming apparatus of FIG. 2;

FIG. 6 is a conceptual diagram for describing data processing when an image on the lower surface side of a document is read.

FIG. 7 is a conceptual diagram for describing data processing when an image on the upper surface side of a document is read.

FIG. 8 is a schematic configuration diagram similar to FIG. 1 showing an embodiment of a double-sided reading device in which a rotary conveyance path is configured by a reading glass and a reading reference guide plate whose length is substantially the same as that of the reading glass.

FIG. 9 is a schematic diagram showing a state in which a reading sensor provided in the double-sided reading device is rotated by 180 degrees.

FIG. 10 is a schematic view showing an example in which a rib-shaped guard member for preventing the reading glass from being damaged is attached to the sensor case of the reading sensor.

[Explanation of symbols]

 3: Document conveying path 10: Double-sided reading device 11: Reading sensor 12, 12 ': Rotating conveying path 14: Reading reference guide plate 18: Reading entrance guide plate 19: Reading exit guide plate 28, 28': Reading glass 30: Drive Motors (drive sources) 35, 36: reading side plate (rotating member) 51: first transport roller 52: second transport roller 60: central processing unit 63: document image information memory unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06T 1/00 420 H04N 1/00 108Q 5C062 H04N 1/00 108 1/028 Z 5C072 1/028 1/12 ZF term (reference) 2H028 BA03 BB04 2H076 AA04 AA58 BA24 BA45 BA58 BA63 3F101 FB17 FC07 FE02 FE11 LA01 LB02 5B047 AA01 BA01 BA07 BB02 BC30 CA14 CB09 EB02 5C051 AA01 BA04 DA03 AC01 AB01 AC05 5C072 AA01 BA01 BA03 DA25 EA07 MB05 NA07 RA04 WA01 WA02 XA01

Claims (6)

[Claims] A first sensor which is provided on a document transport path for transporting the document, and which detects a first one of the documents transported along the document transport path;
A double-sided reading apparatus configured to read an image on a second side and an image on a second side, wherein a rotating member that is rotated by a driving source is provided on the document conveying path, and a part of the document conveying path is used as a rotating conveying path on the rotating member. The reading sensor is attached to the rotating member so as to be able to read an image of one surface of the document passing through the rotating conveyance path on the rotating member, and the document conveying path is upstream in the document conveying direction with respect to the rotating member. A first transport roller, and a second transport roller on the downstream side in the document transport forward direction, and the first transport roller and the second transport roller can be rotated in both forward and reverse directions by a roller drive source. The first sensor reads the image on the first surface of the document conveyed in the forward direction by the first conveyance roller rotated in the forward direction by the reading sensor, and rotates the document in the forward direction. After the document is conveyed in the forward direction by the second conveyance roller and the rear end passes through the rotation conveyance path, the drive source is driven to rotate the rotation member with the reading sensor by 180 degrees, and then the A means is provided for rotating the first transport roller and the second transport roller in opposite directions to transport the document in the reverse direction, and for reading the image on the second surface of the document by the reading sensor. Double-sided reading device. 2. A reading glass for covering a reading side of the reading sensor with a rotation conveyance path provided in the rotating member, and a reading entrance guide plate provided near the reading glass on an upstream side in a document conveyance forward direction. And a reading exit guide plate provided adjacent to the downstream side, and a reading reference guide plate that is opposed to the reading entrance guide plate, the reading exit guide plate, and the reading glass at predetermined intervals. The total length of the reading reference guide plate in the document transport direction is substantially equal to the distance from the entrance of the reading entrance guide plate to the exit of the reading exit guide plate, and the rotation center of the rotating member is set to the original of the reading reference guide plate. 2. The double-sided reading device according to claim 1, wherein the reading device is located at an intermediate position in the transport direction. 3. A rotary conveyance path provided in the rotary member includes a reading glass that covers a reading side of the reading sensor, and a reading reference guide plate that is opposed to the reading glass at a predetermined interval. The total length of the reading glass in the document conveying direction is substantially equal to the total length of the reading reference guide plate in the document conveying direction, and the rotation center of the rotating member is set at an intermediate position of the reading reference guide plate in the document conveying direction. The double-sided reading device according to claim 1, wherein: 4. The double-sided reading device according to claim 1, further comprising a storage unit for storing the image data read by the reading sensor, wherein the storage unit stores the image data of the first side of the document. A double-sided reading apparatus comprising means for storing image data obtained by reading an image from a start line and storing image data obtained by reading an image on the second surface of a document from a last line. 5. The double-sided reading device according to claim 3,
A double-sided reading apparatus, wherein a guard member for preventing damage to the reading glass is provided on a surface of the reading glass opposite to a surface facing the document so as to rotate integrally with the rotating member. 6. An image forming apparatus comprising the double-sided reading device according to claim 1.