JP2022009593A - Image reading device, image reading system, and image reading control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device that, even when a conveyance speed of a document is made variable, can generate data of an image with a resolution desired by a user.

SOLUTION: An image reading device comprises: a conveying device 20 that conveys a document; and reading units 31, 32 that read an image of the document being conveyed. Assuming that a first reading mode is an operation to read an image when specific setting information is not input to a control unit 60 of the image reading device, and a second reading mode is an operation to read an image when the specific setting information is input to the control unit 60, in the second reading mode, the control unit causes the image reading units 31, 32 to read an image from a document that is conveyed by the conveying device 20 at a lower speed than that in the first reading mode, and generates image data of an image with a resolution equal to that in the first reading mode.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an image reading device including a reading unit that reads an image of a document conveyed by the conveying unit.

Patent Document 1 describes an example of an image reading device that transports a document set in a set unit to a predetermined reading position and reads an image of the document transported to the same scanning position by the scanning unit.

By the way, when transporting a color document, transport defects such as paper jam are more likely to occur than when transporting a monochrome document. Therefore, in the image reading device described in Patent Document 1, when reading an image of a color original, the original is conveyed at a lower speed than when reading an image of a monochrome original. Specifically, in the control device of the image reading device, when information based on the user operation is input, it is determined whether to read the image of the color original or the image of the monochrome original. Then, when scanning the image of the monochrome document, the normal transport mode is selected, and when scanning the image of the color document, the transport mode for slower transport than the normal transport mode is selected. The transport unit is operated in the transport mode selected in this way.

Japanese Patent Application Laid-Open No. 2003-128298

By the way, the image reading device may read images of various originals having different thicknesses. When transporting a thin document, transport defects such as paper jam are more likely to occur than when transporting a thick document. Therefore, when scanning an image of a thin document, it is desirable to transport the document at a lower speed than when scanning an image of a thick document.

However, in an image reading device that causes a reading unit to read an image of a document conveyed by the conveying unit, there is generally a correlation between the conveying speed of the document and the resolution of the acquired image. Specifically, the lower the transport speed of the original, the higher the resolution of the image data, that is, the image data is generated. Therefore, when the transport speed of the document is changed according to the thickness of the document, the generated image data is not always the image data of the resolution desired by the user.

An object of the present invention is to provide an image reading device capable of generating image data having a resolution desired by a user even when the transport speed of a document is variable.

The image reading device for achieving the above object is a transport unit that conveys a document, a reading unit that reads an image of a document conveyed by the transport unit, and an image data that is image data read by the reading unit. In an image reading device including a control unit for generating an image, the reading unit reads an image of the original document at predetermined timings when the original document is conveyed by the conveying unit, and is specific. The operation of reading an image from a document when the setting information is not input to the control unit is set as the first reading mode, and the operation of reading an image from the document when the specific setting information is input to the control unit. In the first reading mode, the control unit reads an image from a document conveyed by the conveying unit to the reading unit at a speed corresponding to a required resolution. In addition, the image data of the image read by the reading unit is generated, and in the second reading mode, the image is read from the document conveyed by the conveying unit at a lower speed than in the case of the first reading mode. By delaying the timing from the case of the first reading mode while having the unit read, the image data of the image having the same resolution as that of the first reading mode is generated. When the control unit starts reading an image based on the next job under the situation that the second reading mode is selected, the reading mode to be executed is changed from the second reading mode to the first reading mode. Switch to read mode.

According to the above configuration, when the reading of the image is instructed in the situation where the specific setting information is not input to the control unit, the first reading mode is executed. That is, when the user recognizes that the thickness of the original is not thin, the user instructs the image reader to read the image without performing the user operation such that the specific setting information is input to the control unit. Will be done. At this time, the resolution of the image based on the generated image data can be selected by the user when the user inputs a reading instruction. Therefore, the original is conveyed at a transfer speed that correlates with the resolution requested by the user, and image data of the resolution requested by the user is generated. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the reading of the image is instructed in the situation where the specific setting information is input to the control unit, the second reading mode is executed. That is, when the user recognizes that the thickness of the document is thin, the user performs a user operation such that the specific setting information is input to the control unit, and then the user instructs the image reader to read the image. Will be done. At this time, although the original is conveyed at a lower speed than in the first scanning mode, image data of an image having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original while suppressing transport defects such as paper jam. Therefore, even when the transport speed of the original is variable, it becomes possible to generate image data having a resolution desired by the user.

In the image reading device, when the control unit continuously reads images of a plurality of documents, the specific setting information is input while the transport unit is transporting one of the originals. If so, it is preferable to switch the scanning mode to be performed from the first scanning mode to the second scanning mode at the start of scanning the image of the next document of the one document.

According to the above configuration, when scanning images of a plurality of originals in succession, if the specific setting information is input to the control unit while one of the originals is being conveyed, one original. The first reading mode is continued until the reading of the image is completed. That is, the reading mode is not changed during the transfer of one document, and the transfer speed of the same document is not changed. Therefore, it is possible to suppress an increase in the control load due to the switching of the reading mode during the reading of the image.

After that, when scanning the image of the next original, the second scanning mode is implemented instead of the first scanning mode. That is, when scanning the images of the originals after one original, the originals are conveyed at a low speed. Moreover, since the second scanning mode is used, even if the original is conveyed at a low speed, image data having the same resolution as that in the first scanning mode is generated. Therefore, when scanning the images of the originals after the first original, the originals are conveyed at a low speed to suppress the occurrence of transfer defects of the originals, and at the same time, the image data that does not depend on the transfer speed is provided to the user. It becomes possible.

Further, the image reading device for achieving the above object is a transport unit for transporting a document, a reading unit for reading an image of a document transported by the transport unit, and an image which is image data read by the scanning unit. In an image reading device provided with a control unit for generating data, when the thickness of the document conveyed by the conveying unit is not thin, the operation of reading an image from the original is set as the first reading mode, and the conveying is performed. When the operation of reading an image from the original when the thickness of the original conveyed by the unit is thin is set to the second reading mode, the control unit has the required resolution in the first reading mode. An image is read by the reading unit from a document conveyed by the conveying unit at a corresponding speed, image data of the image read by the reading unit is generated, and in the second reading mode, the first reading is performed. While causing the reading unit to read an image from a document conveyed by the conveying unit at a lower speed than in the mode, image data of an image having the same resolution as in the first reading mode is generated. "When the thickness of the original is not thin" means that the thickness of the original is not thinner than the specified thickness, and "when the thickness of the original is thin" means that the thickness of the original is smaller than the specified thickness. This is the case when it is thin.

According to the above configuration, when the thickness of the document conveyed by the conveying unit is not thin, the first reading mode is implemented. When the user instructs the image reading device to read the image of the original, the resolution of the image based on the generated image data can be selected by the user. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the thickness of the document conveyed by the conveying unit is thin, the second reading mode is executed. In this case, the original is conveyed at a lower speed than in the first scanning mode, but image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original while suppressing transport defects such as paper jam. Therefore, even when the transport speed of the original is variable, it becomes possible to generate image data having a resolution desired by the user.

The image reading device includes a sound wave sensor that outputs a sound wave to the document conveyed by the conveying unit and detects the attenuation rate of the sound wave, and the control unit has the document conveyed by the conveying unit. When the attenuation rate of the sound wave detected by the sound wave sensor is less than the determination attenuation rate under such circumstances, it is determined that the thickness of the document conveyed by the transfer unit is thin, and the second reading mode is performed. Is preferable.

The thinner the original, the smaller the attenuation rate of the sound wave detected by the sound wave sensor. Therefore, in the above configuration, when the attenuation rate of the sound wave detected by the sound wave sensor is less than the determination attenuation rate, it can be determined that the thickness of the conveyed document is thin, so that the second reading mode is performed. I am doing it. By using the detection result by the sound wave sensor in this way, the second reading mode can be automatically selected and carried out.

In the image reading device, the sound wave sensor is a sensor that detects whether or not a plurality of original documents are conveyed in an overlapping state, and is for determining whether or not a plurality of original documents are conveyed in an overlapping state. As the threshold value of, a double feed detection attenuation rate larger than the determination attenuation rate is provided, and the control unit has the attenuation rate of the sound wave detected by the sound wave sensor under the condition that the document is conveyed by the transfer unit. When it is equal to or higher than the determination attenuation rate and less than the double feed detection attenuation rate, the first reading mode is performed, and the sound wave detected by the sound wave sensor under the condition that the document is conveyed by the transfer unit. When the attenuation rate of is equal to or higher than the double feed detection attenuation rate, it is preferable to stop the transfer of the original by the transfer unit and the reading of the image by the reading unit.

When a plurality of original documents are conveyed in an overlapping state, the attenuation rate of the sound wave detected by the sound wave sensor tends to be larger than when only one original document is conveyed. The attenuation rate of the sound wave when two thin documents are overlapped is larger than the attenuation rate of the sound wave when one document whose thickness is not thin is conveyed. Therefore, according to the above configuration, the double feed detection attenuation rate, which is a threshold value for determining whether or not a plurality of documents are conveyed in an overlapping state, is determined to be a value larger than the determination attenuation rate. Then, by using this double feed detection attenuation rate, it is possible to determine whether one document having a thin thickness is being conveyed or whether a plurality of original documents are being conveyed in an overlapping state. Then, by adopting such a discrimination result, it becomes possible to appropriately drive the image reading device according to the situation.

In the image reading device, the transport unit is arranged on a transport roller pair located upstream of the scanning unit in the transport direction of the document and on the upstream side of the transport roller pair in the transport direction of the document, and transports the document. It has a delivery roller that feeds toward a pair of rollers, and it is preferable that the sound wave sensor is arranged between the delivery roller and the transport roller pair in the transport direction of the document.

According to the above configuration, it is possible to determine whether or not the thickness of the conveyed document is thin on the upstream side in the conveying direction from the reading unit.
In the image reading device, the control unit sets the reading mode to be executed from the second reading mode to the first reading mode when a predetermined end condition is satisfied under the condition that the second reading mode is selected. It is preferable to switch to the reading mode of.

According to the above configuration, when it is no longer necessary to carry out the second reading mode, the mode can be switched from the second reading mode to the first reading mode.
In the image reading device, the control unit reads the next image when the setting information to end the second reading mode is input while the second reading mode is selected. It is preferable to switch the reading mode sometimes performed from the second reading mode to the first reading mode.

According to the above configuration, when the setting information that the execution of the second reading mode is unnecessary is input, the first reading mode can be executed when the next image is read.
In the image reading device, when the control unit selects the second reading mode and starts reading an image based on the next job, the second reading mode is executed. It is preferable to switch from the reading mode to the first reading mode.

According to the above configuration, when the image is read based on the next job, the first reading mode can be automatically executed.

The perspective view which shows the schematic structure of the 1st Embodiment of an image reader. The side view which shows the transport device of the image reader and the peripheral member thereof. A table for explaining a plurality of first read modes. The block diagram explaining the functional structure of the image reader. A flowchart illustrating a processing procedure when reading an image with the same image reader. The flowchart explaining the processing procedure at the time of reading an image by the image reading apparatus of 2nd Embodiment. The block diagram explaining the functional structure of the image reading apparatus of 3rd Embodiment. A flowchart illustrating a processing procedure when reading an image with the same image reader.

(First Embodiment)
Hereinafter, the first embodiment in which the image reading device is embodied will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the image reading device 11 of the present embodiment includes a housing 12 and a cover member 13 rotatably supported by the housing 12. The cover member 13 is provided with a user interface 50 of the present device. That is, the user interface 50 has a plurality of buttons 51 and a plurality of lamps 52.

One of the buttons 51 is a specifying button 51A that is operated when instructing the execution of image reading in the second reading mode described later. Further, one of the lamps 52 is a specific lamp 52A that is lit when the specific button 51A is in the ON state. The specifying lamp 52A is turned off when the specifying button 51A is in the off state.

Further, as shown in FIG. 2, the image reading device 11 is provided with a set unit 14 in which a document MS for which an image has not yet been read is set. When a plurality of document MSs are set in the set unit 14, the document MSs are stacked on the set unit 14. Further, inside the housing 12, a transport device 20 as a transport unit for transporting the document MS and a reading device 30 for reading an image of the document MS transported by the transport device 20 are provided. Then, the document MSs set in the set unit 14 enter the housing 12 one by one and are transported along a predetermined transport path. Then, the image of the original MS is read while being conveyed, and the original MS for which the image reading is completed is discharged to the outside of the housing 12.

As shown in FIG. 2, the transport device 20 includes a feed roller 21, a feed roller pair 22, a transport roller pair 23, and a discharge roller pair 24, which are arranged in order from upstream to downstream in the transport direction of the document MS. There is. Further, the transport device 20 includes a transmission motor 25 and a transport motor 26 as a drive source for transporting the document MS. The driving force from the delivery motor 25 is transmitted to the feed roller 21, and the drive force from the transfer motor 26 is transmitted to the feed roller pair 22, the transfer roller pair 23, and the discharge roller pair 24.

The feed roller 21 feeds the lowest-order document MS among the plurality of document MSs set in the set unit 14 into the housing 12. Further, the guide member 27 is arranged above the feed roller 21. The guide member 27 restricts the entry of documents other than the lowest document MS into the housing 12.

The delivery roller pair 22 has a drive roller 221 that is driven and connected to the transfer motor 26, and a driven roller 222 in which the driving force from the transfer motor 26 is transmitted through the drive roller 221. Then, as the drive roller 221 and the driven roller 222 rotate, the document MS is sandwiched between the rollers 221, 222, and the document MS is sent out toward the transport roller pair 23.

The driven roller 222 of the feed roller pair 22 is a retard roller to which a constant rotational load is applied by a torque limiting mechanism such as a torque limiter. Therefore, when a plurality of document MSs are fed into the housing 12 from the set unit 14 in a state of being overlapped with each other, only one document MS is fed downstream in the transport direction by the delivery roller pair 22. In this respect, the two rollers 221 and 222 constituting the sending roller pair 22 function as "feeding rollers" that feed the document MS toward the transport roller pair 23.

The transport roller pair 23 is arranged upstream of the reader 30 in the transport direction on the right side in the drawing. Such a transfer roller pair 23 has a drive roller 231 that is driven and connected to the transfer motor 26, and a driven roller 232 in which the driving force from the transfer motor 26 is transmitted through the drive roller 231. Then, as the drive roller 231 and the driven roller 232 rotate, the document MS is sandwiched between the rollers 231 and 232, and the document MS is conveyed toward the reading device 30.

The discharge roller pair 24 is arranged downstream of the reading device 30 on the left side in the drawing in the transport direction. Such a discharge roller pair 24 has a drive roller 241 that is driven and connected to the transfer motor 26, and a driven roller 242 to which the driving force from the transfer motor 26 is transmitted through the drive roller 241. Then, as the drive roller 241 and the driven roller 242 rotate, the document MS is sandwiched between the rollers 241, 242, and the document MS is discharged to the outside of the housing 12.

The reading device 30 has two reading units 31 and 32 arranged on both upper and lower sides of the original MS to be conveyed along the conveying path. Of the reading units 31 and 32, the reading unit located on the lower side is the first reading unit 31, and the reading unit located on the upper side is the second reading unit 32. That is, the first reading unit 31 reads the image on one side (lower surface in the figure) of the document MS, and the second reading unit 32 reads the image on the other side (upper surface in the figure) of the document MS. As the reading unit, for example, a contact image sensor module (CISM) can be mentioned. Of course, a module other than CISM may be adopted as the reading unit.

As shown in FIG. 2, an end detection sensor 600 for detecting the end of the document MS is provided between the reading device 30 and the transport roller pair 23 in the transport direction of the document MS.
Further, a double feed detection sensor 610 for detecting that a plurality of document MSs are being transported in an overlapping state is provided between the feed roller pair 22 and the transport roller pair 23 in the transport direction of the document MS. ing. The double feed detection sensor 610 is a sound wave sensor and has an output unit 611 for outputting a sound wave and an input unit 612 for inputting a sound wave output from the output unit 611. Then, one of the output unit 611 and the input unit 612 is arranged above the document MS transported along the transport path, and is output below the document MS transported along the transport path. The other of the unit 611 and the input unit 612 is arranged. In the example shown in FIG. 2, the input unit 612 is arranged in the upper part of the figure, and the output unit 611 is arranged in the lower part of the figure.

Then, the double feed detection sensor 610 detects the attenuation rate α of the sound wave. When the output value of the sound wave output from the output unit 611 is "X1" and the input value of the sound wave input to the input unit 612 is "X2", the attenuation factor α is the relational expression (Equation 1) shown below. It is a value that can be calculated using.

α = (X1-X2) / X1 ... (Equation 1)
By the way, in the image reading device 11 of the present embodiment, the resolution of the image based on the image data output from the device can be selected by the user. That is, the first reading mode, which is an example of the image reading mode, can be selected by the operation of the user interface 50 by the user or the operation by the user of the external device communicating with the image reading device 11.

Further, in the image reading device 11 in which the image of the conveyed original MS is read by the reading units 31 and 32, the smaller the conveying speed of the original MS, the higher the resolution of the image data is generated. To. Therefore, it can be said that the first reading mode for providing the user with high-resolution image data is a mode in which the document MS is conveyed at a speed that correlates with the resolution requested by the user.

FIG. 3 illustrates an example of a table showing a plurality of (three in this case) first read modes. As shown in FIG. 3, the first mode is a reading mode in which the original MS has a high transport speed and generates image data having a low resolution. The second mode is a reading mode in which the original MS has a medium transport speed and produces image data having a medium resolution. The third mode is a reading mode in which the transport speed of the original MS is low and high-resolution image data is generated.

Then, when instructing the image reading device 11 to read the image, the user can select one reading mode (that is, the first reading mode) from the above three modes.

Here, the image reading device 11 of the present embodiment can read images of various document MSs having different thicknesses. The thinner the original MS is, the more likely it is that paper jams and other transport defects will occur during transport. In order to suppress the occurrence of such transport defects, it is desirable to transport the original MS at a low speed.

Therefore, as described above, the user interface 50 is provided with the identification button 51A. The specifying button 51A is a button that is turned on when reading an image of a document MS, which is prone to transfer defects during transfer, such as a thin document MS. Then, when the identification button 51A is turned on by the user's operation, specific setting information which is information about the specific user operation is input to the control device 60 (see FIG. 4) as the control unit of the image reading device 11. Then, a second reading mode different from the first reading mode is implemented. The "specific user operation" referred to here is a button operation by the user for turning on the specific button 51A.

That is, the operation of reading an image from the original MS when the specific setting information is not input to the control device 60 is the first reading mode. Further, the operation of reading an image from the original MS when the specific setting information is input to the control device 60 is set as the second reading mode.

The second scanning mode is a mode for generating image data having the same resolution as in the first scanning mode while transporting the original MS at a lower speed than in the first scanning mode. For example, when the specific button 51A is turned on in a situation where the user has selected the implementation of the first mode, that is, in a situation where the resolution requested by the user is low, the second mode shown below is shown below. Read mode is implemented.
-The original MS is conveyed at a lower speed than when the first mode is performed. For example, the original MS is conveyed at the transfer speed in the third mode, or at a speed similar to the transfer speed.
-Generate image data with the same resolution as in the first mode.

Further, when the specific button 51A is turned on in a situation where the user has selected the implementation of the third mode, that is, in a situation where the resolution requested by the user is high, the second mode shown below is shown below. Read mode is implemented.
-The original MS is conveyed at a lower speed than when the third mode is performed.
-Generate image data with the same resolution as in the third mode.

By implementing such a second reading mode, the original MS is conveyed at a low speed, so that the occurrence of transfer defects of the original MS is suppressed even when the image of the thin original MS is read. To. Moreover, even if the original MS is conveyed at a low speed in this way, the resolution of the image based on the generated image data is the resolution requested by the user, that is, the case of the first reading mode selected by the user. Equal resolution.

Next, the control device 60 of the image reading device 11 will be described with reference to FIG.
The control device 60 includes a microcomputer composed of a CPU, ROM, RAM, and the like, and various driver circuits. As shown in FIG. 4, such a control device 60 includes a transfer control unit 61, a mode selection unit 66, a data generation unit 64, and a data output unit 65 as functional units composed of at least one of software and hardware. I'm out.

The transport control unit 61 controls the transport device 20. That is, when the transfer start instruction of the document MS, that is, the instruction to read the image of the document MS is input, the transfer control unit 61 rotates the feed roller 21 by driving the feed motor 25. As a result, one document MS is sent into the housing 12 from the set unit 14. Then, the transport control unit 61 stops the drive of the feed motor 25 when the document MS transported by the rotation of the feed roller 21 is sandwiched by the two rollers 221, 222 constituting the feed roller pair 22. ..

Further, the transfer control unit 61 rotates each of the rollers 221,231, 241,222, 232, 242 of the delivery roller pair 22, the transfer roller pair 23, and the discharge roller pair 24 by driving the transfer motor 26. The drive start timing of the transfer motor 26 may be the same as the drive start timing of the transmission motor 25, or may be later than the drive start timing of the transmission motor 25. Then, the transfer control unit 61 stops the drive of the transfer motor 26 after the timing when the rear end of the document MS passes through the discharge roller pair 24.

Information regarding the transport speed of the document MS is input to the transport control unit 61 from the mode selection unit 66. Then, the transport control unit 61 controls the drive of the transport motor 26 so as to transport the document MS at a speed based on the input information.

The mode selection unit 66 determines the reading mode to be executed based on the user information input when the image is read. That is, when the information for specifying the image resolution is input from the user interface 50 or the external device, the mode selection unit 66 selects the first reading mode according to the image resolution requested by the user. (See Fig. 3). For example, if the user requests a high resolution image, the mode selection unit 66 selects a third mode. Then, the mode selection unit 66 outputs the information regarding the selected reading mode to the transfer control unit 61 and the data generation unit 64. Further, when the identification button 51A is in the ON state, the mode selection unit 66 selects the second reading mode and outputs information regarding the reading mode to the transport control unit 61 and the data generation unit 64.

The data generation unit 64 controls the reading units 31 and 32 of the reading device 30, and acquires the images read by the reading units 31 and 32. Then, the data generation unit 64 generates image data which is the data of the image read by the reading units 31 and 32, and outputs this image data to the data output unit 65.

The resolution of the image based on the image data generated at this time is a resolution corresponding to the information regarding the resolution input from the mode selection unit 66. That is, when the identification button 51A is in the off state, the data generation unit 64 generates image data having a resolution corresponding to the transport speed of the original MS. On the other hand, when the identification button 51A is on, the data generation unit 64 generates image data having a resolution requested by the user even if the transport speed of the original MS is low.

Here, the acquisition of the image from the original MS is realized by having the reading units 31 and 32 read the image at predetermined timings while the original MS is being conveyed. Therefore, the resolution of the image acquired by the reading units 31 and 32 increases as the transport speed of the original MS decreases. Therefore, the resolution of the image acquired when the second reading mode is performed may be higher than the resolution desired by the user. Therefore, in the second reading mode, the data generation unit 64 lowers the resolution of the acquired image to the resolution desired by the user, and generates data of the image having the same resolution.

Further, when the second reading mode is executed, the data generation unit 64 can acquire an image having a low resolution (that is, an image having a resolution assuming that the first reading mode is executed) so that the reading unit 31 can acquire the image. , 32 may be controlled. For example, by delaying the above-mentioned predetermined timing, it is possible to acquire an image having a resolution lower than the resolution according to the transport speed of the original MS. In this case, the data generation unit 64 can generate image data having a resolution requested by the user even if the transport speed of the original MS is low. That is, it is not necessary to perform a process of lowering the resolution of the acquired image.

The data output unit 65 transmits the image data generated by the data generation unit 64 to the external device.
Next, the processing procedure for reading the image of the original MS will be described with reference to the flowchart shown in FIG.

As shown in FIG. 5, it is determined whether or not the specifying button 51A is in the ON state under the condition that any one of the first mode, the second mode, and the third mode is selected. (Step S11). When the specifying button 51A is in the off state (step S11: NO), the first reading mode is selected (step S12), and the process is shifted to step S14, which will be described later. On the other hand, when the identification button 51A is in the ON state (step S11: YES), the second reading mode is selected (step S13), the identification lamp 52A is turned on, and the process is shifted to the next step S14. To.

By starting the execution of the selected reading mode in step S14, the reading of the image is started. For example, when the identification button 51A is in the off state and the second mode is selected, the transport device 20 transports the original MS at a medium speed to generate medium resolution image data. Further, when the identification button 51A is in the ON state and the second mode is selected, the original MS is conveyed at a low speed by the conveying device 20, and image data of an image having a medium resolution is generated.

Then, while the image is being read in this way, it is determined whether or not the attenuation factor α detected by the double feed detection sensor 610 is equal to or higher than the double feed detection attenuation factor αTh1 (step S15). .. The double feed detection attenuation factor αTh1 is a threshold value for determining whether or not a plurality of original MSs are conveyed in an overlapping state. For example, when only one original MS having a normal thickness is conveyed and this original MS is located between the output unit 611 and the input unit 612 of the double feed detection sensor 610, the attenuation factor α is set to “standard attenuation”. Let's say "rate". In this case, the double feed detection attenuation factor αTh1 is set to a value larger than the standard attenuation factor.

When the attenuation factor α is equal to or higher than the double feed detection attenuation factor αTh1 (step S15: YES), it can be determined that the plurality of original MSs are conveyed in an overlapping state, so that the image reading is stopped. (Step S16). In this case, the transmission of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process is terminated.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S15: NO), it can be determined that only one original document MS is being conveyed, so that the image reading is continued. Then, it is determined whether or not the image reading is completed (step S17).

The rear end of the document MS can be detected based on the reading results of the reading units 31 and 32. That is, based on the reading result by the reading units 31 and 32, it can be determined whether or not the rear end of the document MS is located downstream of the reading units 31 and 32 in the transport direction. Then, when the rear end of the document MS is located downstream of the reading units 31 and 32 in the transport direction, it can be determined that the reading of the image of the document MS is completed.

If the reading of the image of the original MS has not been completed yet (step S17: NO), the process proceeds to the above-mentioned step S15, and the reading of the image is continued. On the other hand, when the reading of the image of the original MS is completed (step S17: YES), the process proceeds to the next step S18.

In step S18, it is determined whether or not there is the next document MS for which the image should be read. If there is a next manuscript MS (step S18: YES), the process proceeds to step S14 described above, and the transfer of the next manuscript MS is started. In this case, the transport speed of the next document MS is equal to the transport speed of the previous document MS. On the other hand, when there is no next document MS (step S18: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S19), and this process is terminated.

When continuously reading images of a plurality of original MSs, the identification button 51A may be operated by the user during continuous reading of a series of images. In the image reading device 11 of the present embodiment, the operation of the specifying button 51A by such a user is invalidated. That is, even if the identification button 51A is operated during continuous scanning of images, the transport speed of one document is equal to the transport speed of the next document of the one document. In other words, the operation of the specifying button 51A is valid until the execution of continuous reading of a series of images is started, that is, before the process described with reference to FIG. 5 is started.

As described above, according to the image reading device 11 of the present embodiment, the following effects can be obtained.
(1) When the image reading is instructed while the specifying button 51A is in the off state, the first reading mode is executed. That is, when the user recognizes that the thickness of the document MS set in the set unit 14 is not thin, the user instructs the image reading device 11 to read the image without turning on the identification button 51A. To. At this time, the resolution of the image based on the generated image data can be selected by the user when the user inputs a reading instruction. Therefore, the original MS is transported at a transport speed corresponding to the resolution of the image requested by the user, and image data having the resolution requested by the user is generated. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the image reading is instructed while the specifying button 51A is on, the second reading mode is executed. That is, when the user recognizes that the thickness of the document MS set in the set unit 14 is thin, the identification button 51A is turned on, and then the user instructs the image reading device 11 to read the image. .. At this time, although the original MS is conveyed at a lower speed than in the first scanning mode, image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original MS while suppressing transport defects such as paper jam. Therefore, even when the transport speed of the original MS is variable, it is possible to generate image data having a resolution desired by the user.

(Second embodiment)
Next, a second embodiment embodying the image reading device 11 will be described with reference to FIG. In the second embodiment, a part of the processing procedure when the specifying button 51A is in the ON state is different from the first embodiment. Therefore, in the following description, the parts different from those of the first embodiment will be mainly described, and the same member configurations as those of the first embodiment are designated by the same reference numerals and duplicate explanations will be omitted. do.

FIG. 6 shows a flowchart illustrating a processing procedure for reading an image of the original MS.
As shown in FIG. 6, it is determined whether or not the specifying button 51A is in the ON state under the condition that any one of the first mode, the second mode, and the third mode is selected. (Step S11). When the specifying button 51A is in the off state (step S11: NO), the first reading mode is selected (step S12), and the process is shifted to step S14, which will be described later. On the other hand, when the identification button 51A is in the ON state (step S11: YES), the second reading mode is selected (step S13), and the process proceeds to the next step S14.

By starting the execution of the selected reading mode in step S14, the reading of the image is started. Then, when the attenuation factor α detected by the double feed detection sensor 610 becomes equal to or higher than the double feed detection attenuation factor αTh1 while the image is being read in this way (step S15: YES), a plurality of images are being read. Since it can be determined that the original MSs are being conveyed in an overlapping state, the reading of the images is stopped (step S16). In this case, the transmission of the document MS is stopped, and the user interface 50 notifies the user of the error. For example, the specific lamp 52A is turned on. After that, this process is terminated.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S15: NO), it can be determined that only one original document MS is being conveyed, so that the image reading is continued. If the reading of the image of the original MS has not been completed yet (step S17: NO), the process is shifted to the above-mentioned step S15, and the reading of the image of the original MS is continued. On the other hand, when the reading of the image of the original MS has already been completed (step S17: YES), the process proceeds to the next step S18.

In step S18, it is determined whether or not there is the next document MS for which the image should be read. When there is no next manuscript MS (step S18: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S19), and this process is terminated.

On the other hand, when there is the next manuscript MS (step S18: YES), the process is shifted to the above-mentioned step S11, and the transfer of the next manuscript MS is started. That is, if the identification button 51A is changed during the reading of the previous image, the transfer speed of the original MS is changed from the time of reading the current image, but the resolution of the image based on the generated image mode is the previous one. The resolution is the same as when the image is read.

For example, when the identification button 51A is changed from the off state to the on state during the reading of the previous image, the first reading mode is executed when the previous image is read, whereas the current image is read. Sometimes a second read mode is implemented. That is, at the start of reading the image this time, the mode to be executed is switched from the first reading mode to the second reading mode.

On the other hand, when the identification button 51A is changed from the on state to the off state during the reading of the previous image, the second reading mode is executed at the time of reading the previous image, whereas the reading of the current image is performed. Sometimes a first read mode is implemented. That is, when the setting information to end the second reading mode is input in the situation where the second reading mode is selected, the mode to be executed at the start of reading the current image is the second mode. The reading mode can be switched to the first reading mode. Therefore, in the image reading device 11 of the present embodiment, the transition of the specifying button 51A from the on state to the off state by the operation of the specifying button 51A by the user corresponds to the "predetermined end condition".

As described above, according to the image reading device 11 of the present embodiment, in addition to the same effect as the effect (1) in the first embodiment, the following effects can be further obtained.
(2) When the identification button 51A is turned on while one of the originals of each original MS is being conveyed when reading the images of a plurality of original MSs in succession, the image of one original is displayed. The execution of the first reading mode is continued until the reading is completed. That is, the reading mode is not changed during the transfer of one document, and the transfer speed of the same document is not changed. Therefore, it is possible to suppress an increase in the control load due to the switching of the reading mode during the reading of the image.

After that, when scanning the image of the next original, the second scanning mode is implemented instead of the first scanning mode. That is, when scanning the images of the originals after one original, the originals are conveyed at a low speed. Moreover, since the second scanning mode is used, even if the original is conveyed at a low speed, image data having the same resolution as in the first scanning mode is generated. Therefore, when scanning the images of the originals after the above-mentioned one original, the original MS is conveyed at a low speed to suppress the occurrence of transfer defects of the original MS, and at the same time, the image data that does not depend on the transfer speed is provided to the user. Can be provided.

(3) However, if the identification button 51A is changed from the on state to the off state while the image of the original MS is being read in the second reading mode, the second reading mode is executed. It can be determined that the end condition is satisfied. Therefore, when the image of the next document MS is read, the first reading mode is executed, and the document MS is conveyed at the speed specified by the first reading mode. Therefore, when it is no longer necessary to carry out the second reading mode, the second reading mode can be appropriately switched to the first reading mode.

(Third embodiment)
Next, a third embodiment embodying the image reading device 11 will be described with reference to FIGS. 7 and 8. In the third embodiment, the thickness of the original MS to be read of the image is automatically detected, and whether the second reading mode or the first reading mode is carried out based on the detection result is determined. The point of judgment is different from each of the first and second embodiments. Therefore, in the following description, the parts different from the first and second embodiments will be mainly described, and the same member configurations as those of the first and second embodiments are designated by the same reference numerals. The duplicate explanation shall be omitted.

The control device 60 of the image reading device 11 will be described with reference to FIG. 7.
The control device 60 includes a microcomputer composed of a CPU, ROM, RAM, and the like, and various driver circuits. As shown in FIG. 7, such a control device 60 includes a transfer control unit 61, a mode selection unit 66, a data generation unit 64, and a data output unit 65 as functional units composed of at least one of software and hardware. I'm out.

The mode selection unit 66 determines whether or not the thickness of the conveyed document MS is thin based on the attenuation factor α detected by the double feed detection sensor 610. Then, when it is determined that the thickness of the original MS is not thin, the mode selection unit 66 selects the first reading mode (see FIG. 3) according to the resolution of the image requested by the user, and selects the first. Information about the reading mode (for example, the third mode) is output to the transport control unit 61 and the data generation unit 64. On the other hand, when it is determined that the thickness of the original MS is thin, the mode selection unit 66 selects the second reading mode and outputs information regarding the selected second reading mode to the transport control unit 61 and the data generation unit 64. ..

Here, an example of a method for determining whether or not the thickness of the conveyed document MS is thin will be described.
That is, when the document MS is located between the output section 611 and the input section 612 of the double feed detection sensor 610, the sound wave output from the output section 611 passes through the document MS and is input to the input section 612. At this time, when the sound wave is transmitted through the document MS, the thinner the thickness of the document MS, the less the sound wave is attenuated. That is, the thickness of the original MS can be estimated to some extent based on the attenuation factor α of the sound wave. Therefore, a determination attenuation factor αTh2 is provided as a attenuation factor as a criterion for determining whether or not the thickness of the original MS is thin, and when the attenuation factor α is less than the determination attenuation factor αTh2, the thickness of the conveyed original MS is thin. I am trying to judge.

It should be noted that a plurality of thin original MSs may be conveyed in an overlapping state. For example, when two document MSs are overlapped, the attenuation rate α detected by the double feed detection sensor 610 is larger than the attenuation rate when one document MS having a small thickness is conveyed. Therefore, the double feed detection attenuation factor αTh1 is set to a value larger than the attenuation factor when one document MS having a small thickness is conveyed. Thereby, when the attenuation factor α is the determination attenuation factor αTh2 or more and the double feed detection attenuation factor αTh1 or less, it can be determined that the thickness of the conveyed document MS is not thin. On the other hand, when the attenuation factor α is the double feed detection attenuation factor αTh1 or more, it can be determined that a plurality of document MSs are conveyed in an overlapping state.

Next, the processing procedure for reading the image of the original MS will be described with reference to the flowchart shown in FIG.
As shown in FIG. 8, the transfer of the original MS in the first scanning mode according to the image resolution requested by the user is started (step S31). Then, when the document MS is located between the output unit 611 and the input unit 612 of the double feed detection sensor 610, is the attenuation factor α detected by the double feed detection sensor 610 less than the determination attenuation factor αTh2? Whether or not it is determined (step S32). That is, in step S32, it is determined whether or not the thickness of the conveyed document MS is thin.

When the attenuation factor α is less than the determination attenuation factor αTh2 (step S32: YES), it is determined that the document MS having a thin thickness is being conveyed, and the reading mode is changed from the first reading mode to the second reading mode. Switching (step S33). As a result, the transport speed of the document MS is reduced. When the second reading mode is implemented in this way, the specifying lamp 52A is turned on. Then, the process proceeds to the next step S34.

In step S34, it is determined whether or not the front end of the document MS is detected by the end detection sensor 600. If the front end of the document MS has not yet been detected (step S34: NO), the process proceeds to step S32 described above. On the other hand, when the front end of the document MS is detected (step S34: YES), the process is shifted to step S37 described later. That is, when the front end of the document MS passes through the end detection sensor 600 and reaches just before the reading device 30, the change of the reading mode is prohibited and the transport speed of the document MS is not changed.

On the other hand, in step S32, when the attenuation factor α is the determination attenuation factor αTh2 or more (NO), it can be determined that the thickness of the conveyed document MS is not thin, so that the attenuation factor α is double-fed. It is determined whether or not the detection attenuation factor is less than αTh1 (step S35). In this step S35, it is determined whether or not a plurality of original MSs are conveyed in an overlapping state. Then, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S35: YES), it can be determined that one document MS having a thin thickness is being conveyed. It will be transferred to S34. In this case, the image is read by the reading units 31 and 32 while the original MS is being conveyed at the conveying speed specified in the first reading mode. When the document MS is conveyed in the first reading mode in this way, the identification lamp 52A is turned off.

On the other hand, when the attenuation factor α is the double feed detection attenuation factor αTh1 or more (step S35: NO), it can be determined that the plurality of original MSs are conveyed in an overlapping state, so that the image reading is stopped. (Step S36). In this case, the transmission of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process is terminated.

In step S37, scanning of the image of the conveyed document MS is started. Then, it is determined whether or not the attenuation factor α detected by the double feed detection sensor 610 while the image is being read is less than the double feed detection attenuation factor αTh1 (step S38). .. When the attenuation factor α is the double feed detection attenuation factor αTh1 or more (step S38: NO), it can be determined that the plurality of original MSs are conveyed in an overlapping state, so that the process is performed in step S36 described above. Will be migrated. That is, when it is detected that a plurality of original MSs are being conveyed in an overlapping state, the reading of the image during the execution is stopped.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S38: YES), it is determined whether or not the image of the conveyed original MS has been read (step S39). If the image reading is not yet completed (step S39: NO), the process proceeds to the above-mentioned step S38, and the image reading is continued. On the other hand, when the reading of the image is completed (step S39: YES), the process proceeds to the next step S40.

In step S40, it is determined whether or not there is the next document MS for which the image should be read. If there is a next manuscript MS (step S40: YES), the process proceeds to step S31 described above, and the transfer of the next manuscript MS is started. In this case, even after the image has been read in the second reading mode, the transfer of the original MS in the first reading mode is started. That is, the completion of scanning the image of the original MS corresponds to the "predetermined termination condition" for switching the mode from the second scanning mode to the first scanning mode.

On the other hand, when there is no next document MS (step S40: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S41), and this process is terminated.

As described above, according to the image reading device 11 of the present embodiment, the following effects can be obtained.
(4) When the thickness of the document MS transported by the transport device 20 is not thin, the first reading mode is implemented. When the user instructs the image reading device 11 to read the image of the original MS, the resolution of the image based on the generated image data can be selected by the user. Therefore, it is possible to provide the user with image data which is image data having a resolution desired by the user.

On the other hand, when the thickness of the document MS transported by the transport device 20 is thin, the second reading mode is implemented. In this case, although the original MS is conveyed at a lower speed than in the first scanning mode, image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original MS while suppressing transport defects such as paper jam. Therefore, even when the transport speed of the original MS is variable, it is possible to generate image data having a resolution desired by the user.

(5) In the image reading device 11 of the present embodiment, when the attenuation factor α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation factor αTh2, it is determined that the thickness of the original MS being conveyed is thin. Therefore, the second reading mode is implemented. By using the detection result by the double feed detection sensor 610 in this way, the second reading mode can be automatically selected and implemented.

(6) The double feed detection attenuation factor αTh1 which is a threshold value for determining whether or not a plurality of original MSs are conveyed in an overlapping state is determined to be a value larger than the determination attenuation factor αTh2. Then, by using this double feed detection attenuation factor αTh1, it is possible to determine whether only one document having a thin thickness is being conveyed or whether a plurality of documents are being conveyed in an overlapping state. Then, by adopting such a discrimination result, the image reading device 11 can be appropriately driven according to the situation.

(7) The double feed detection sensor 610 is arranged between the transport roller pair 23 and the feed roller pair 22 in the transport direction. Therefore, it is possible to determine whether or not the thickness of the conveyed document MS is thin before the tip of the document MS reaches the position of the reading device 30. Therefore, it is determined whether the mode is switched from the first reading mode to the second reading mode or the first reading mode is continued before the reading of the image by the reading units 31 and 32 is actually started. can do. Therefore, it is not necessary to change the transport speed of the document MS while the images are actually being read by the reading units 31 and 32.

(8) Then, when the transfer of the document MS in the second reading mode is completed, the end condition of the second reading mode is satisfied, so that the transfer of the document MS in the first scanning mode is started. Therefore, when scanning images of a plurality of original MSs in succession, if a part of each original MS is a thin original, the original is conveyed at a low speed only when scanning the image of the thin original. can do. Therefore, even when reading an image of a document that is not thin, it is possible to suppress a decrease in the throughput of the image reading device 11 as compared with the case where the document is conveyed at a low speed.

In addition, each of the above-mentioned embodiments may be changed as follows.
-In the third embodiment, if the double feed detection sensor 610 is arranged upstream of the reader 30 in the transport direction, the double feed detection sensor 610 is used for the feed roller pair 22 and the transport roller pair 23 in the transport direction. It may be placed in a position other than between and. For example, the double feed detection sensor 610 may be arranged between the reader 30 in the transport direction and the transport roller pair 23.

-If it is a sensor that can detect whether or not the thickness of the transmitted document MS is thin and whether or not multiple document MSs are transported in an overlapping state, a sensor other than the sound wave sensor is double-fed. It may be applied as a detection sensor.

The current value flowing through the transport motor 26 during transport of the document MS increases as the load applied to the roller pair rotating with the transport motor 26 as the drive source increases. Then, such a load changes depending on the thickness of the transmitted document MS and the number of overlapping document MSs. Therefore, in the second embodiment, it is determined whether or not the thickness of the transmitted document MS is thin based on the current value flowing through the transfer motor 26 instead of the attenuation factor α detected by the double feed detection sensor 610. You may try to do it. Similarly, in each of the first and second embodiments, it may be determined whether or not a plurality of document MSs are conveyed in an overlapping state based on the current value flowing through the transfer motor 26.

In each of the first and second embodiments, the user operation for selecting the second reading mode is performed not by the user interface 50 of the image reading device 11 but by an external device capable of communicating with the image reading device 11. You may do so. In this case, the second reading mode is executed when the control device 60 of the image reading device 11 receives the specific setting information which is the information related to the user operation from the external device.

-In each of the first and second embodiments, when the image reading in the second reading mode is completed and the image is read based on the next job, the specifying button 51A is turned off and specified. The lamp 52A may be turned off to carry out the first reading mode. In this case, inputting an image reading instruction based on the next job to the control device 60 corresponds to the "end condition".

-In each of the above embodiments, the second reading mode is implemented as needed even when the third mode is selected by the user, but the third mode is not limited to this. The second read mode may not be performed when selected. In this case, for example, in each of the first and second embodiments, when the third mode is selected, the third mode may be in the on state or the off state regardless of whether the specific button 51A is in the on state or the off state. The mode will be implemented. Further, in the third embodiment, when the third mode is selected, even if the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation rate αTh2, the third embodiment is used. The mode will be implemented.

-In each of the first and second embodiments, the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is the determination attenuation rate αTh2 or more even when the identification button 51A is in the ON state. Occasionally, the first read mode may be implemented. Further, when the identification button 51A is in the ON state and the attenuation factor α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation factor αTh2, the second reading mode may be executed. good.

Further, when the identification button 51A is in the off state, the first reading mode is executed even if the attenuation factor α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation factor αTh2. You may.

The reading device 30 may be configured to include only one of the first reading unit 31 and the second reading unit 32.
The transport device 20 may be configured not to include the delivery motor 25. In this case, the feed roller 21 may be rotated by driving the conveyor motor 26.

-The image reading device may be embodied in another device such as a facsimile machine as long as it is a device that generates image data related to the image of the original and outputs it to an external device.

11 ... Image reading device, 20 ... Transfer device as a transfer unit, 221,222 ... Roller functioning as a sending roller, 23 ... Transfer roller pair, 31, 32 ... Reading unit, 60 ... Control device as a control unit, 600 ... Edge detection sensor composed of sound wave sensor, MS ... Original, α ... Attenuation rate, αTh1 ... Double feed detection attenuation rate, αTh2 ... Judgment attenuation rate.

The present invention relates to an image reading device including a reading unit that reads an image of a document conveyed by the conveying unit. The present invention also relates to an image reading system and an image reading control method.

An object of the present invention is to provide an image reading device , an image reading system, and an image reading control method capable of generating image data having a resolution desired by a user even when the transport speed of a document is variable. There is something in it.

According to the above configuration, when the image is read based on the next job, the first reading mode can be automatically executed.
An image reading system for achieving the above object is a transport unit for transporting a document and a scanning unit for reading an image of a document transported by the transport unit, one side of a transport path on which the document is transported. An image reading device including a first reading unit arranged in the image reader and a reading unit having a second reading unit arranged on the other side, and an external device capable of communicating with the image reading device. In an image reading system, when a document is transported by the transport unit, the image of the document is read by the scanning unit at predetermined timings, and by delaying the predetermined timing, the resolution of the image read by the scanning unit. When generating image data of an image of the first resolution, the external device inputs specific setting information which is information indicating that the user is required to transport the original at a low speed. In the non-existing state, the transport unit transports the original at the first transport speed, and in the state where the specific setting information is input from the external device, the transport unit is slower than the first transport speed. When the original is conveyed at the second conveying speed and the image data of the image of the second resolution having a resolution higher than the first resolution is generated, is the specific setting information input from the external device? Regardless of whether or not, the transport unit transports the original at a third transport speed, which is slower than the first transport speed.
An image reading system for achieving the above object is a transport unit for transporting a document and a scanning unit for reading an image of a document transported by the transport unit, one side of a transport path on which the document is transported. An image reading device including a first reading unit arranged in the image reader and a reading unit having a second reading unit arranged on the other side, and an external device capable of communicating with the image reading device. In the image reading system, it is possible to perform a process of lowering the resolution of the image read by the reading unit, and when generating image data of an image of the first resolution, the user can transfer the original from the external device at a low speed. When the specific setting information which is the information indicating that the image is requested is not input, the transport unit transports the document at the first transport speed, and the specific setting information is input from the external device. In this state, the transport unit transports the document at a second transport speed that is slower than the first transport speed, and obtains image data of an image having a second resolution that is higher than the first resolution. When generating, the transport unit transports the original at a third transport speed, which is slower than the first transport speed, regardless of whether or not the specific setting information is input from the external device.
In the image reading control method for achieving the above object, the image of the document conveyed by the conveying unit for conveying the document is read by the reading unit, and the image data which is the data of the image read by the reading unit is generated in the control unit. An image reading control method for causing the reading unit to read an image of the original document at predetermined timings, and a step of delaying the timing to change the resolution of image data generated by the control unit. , When specific setting information, which is information indicating that the user is required to transfer the original at a low speed, is not input to the control unit, the original is conveyed to the transfer unit at the first transfer speed. , In the step of causing the control unit to generate image data of the image of the first resolution, and in the second transport speed which is slower than the first transport speed when the specific setting information is input. The step of transporting the original to the transport unit and causing the control unit to generate image data of the image of the first resolution, and when the specific setting information is not input, the transfer speed is higher than that of the first transport speed. The step of causing the control unit to generate image data of an image having a second resolution having a resolution higher than that of the first resolution by causing the original to be conveyed to the transfer unit at a third transfer speed which is a low speed, and the above-mentioned identification. When the setting information of is input, the step of transporting the document to the transport unit at the third transport speed and causing the control unit to generate image data of the image of the second resolution is included.
In the image reading control method for achieving the above object, the image of the document conveyed by the conveying unit for conveying the document is read by the reading unit, and the image data which is the data of the image read by the reading unit is generated in the control unit. This is an image reading control method that requires the user to change the resolution of the image data generated by the control unit by lowering the resolution of the image read by the reading unit, and to transport the original at a low speed. When the specific setting information, which is the information indicating that the image is set, is not input to the control unit, the original is conveyed to the transfer unit at the first transfer speed, and the image data of the image of the first resolution is obtained. When the step of generating the control unit and the specific setting information are input, the original is conveyed to the transfer unit at a second transfer speed lower than the first transfer speed, and the first image is transferred. The step of causing the control unit to generate image data of an image having a resolution of 1, and the transport at a third transport speed, which is slower than the first transport speed when the specific setting information is not input. A step of transporting a document to a unit and causing the control unit to generate image data of an image having a second resolution higher than the first resolution, and when the specific setting information is input. The step includes a step of transporting a document to the transport unit at the third transport speed and causing the control unit to generate image data of an image having the second resolution.

Claims (4)

A transport unit that can transport documents of different thickness,
A reading unit that reads an image of a document transported by the transport unit,
In an image reading device including a control unit that generates image data that is image data read by the reading unit.
When the original is conveyed by the conveying unit, the reading unit reads the image of the original at predetermined timings.
The control unit selects the first reading mode when the specific setting information is not input to the control unit, and the second reading mode when the specific setting information is input to the control unit. Select and
The control unit
In the first reading mode, an image is read by the reading unit from a document conveyed by the conveying unit at a speed corresponding to a required resolution, and image data of the image read by the reading unit is generated. ,
In the second scanning mode, the image is read by the scanning unit from the document conveyed by the conveying unit at a lower speed than in the case of the first scanning mode, and the timing is set in the first scanning mode. By lagging behind the case, image data of an image having the same resolution as in the case of the first reading mode is generated.
The control unit
When the predetermined end condition is satisfied in the situation where the second scanning mode is selected when scanning the images of a plurality of documents.
The reading mode to be carried out is switched from the second reading mode to the first reading mode.
The first scanning mode is performed from a document in which an image is scanned after the predetermined end condition is satisfied.
The predetermined end condition is a case where the user operates to switch from a state in which the specific setting information is input to a state in which the specific setting information is not input. .. A transport unit that can transport documents of different thickness,
A reading unit that reads an image of a document transported by the transport unit,
In an image reading device including a control unit that generates image data that is image data read by the reading unit.
When the original is conveyed by the conveying unit, the reading unit reads the image of the original at predetermined timings.
The control unit selects the first reading mode when the specific setting information is not input to the control unit, and the second reading mode when the specific setting information is input to the control unit. Select and
The control unit
In the first reading mode, an image is read by the reading unit from a document conveyed by the conveying unit at a speed corresponding to a required resolution, and image data of the image read by the reading unit is generated. ,
In the second reading mode, the image is read by the reading unit from the document conveyed by the conveying unit at a lower speed than in the case of the first reading mode, but the resolution of the image read by the reading unit is performed. By lowering the value, image data of an image having the same resolution as in the case of the first reading mode is generated.
The control unit
When the predetermined end condition is satisfied in the situation where the second scanning mode is selected when scanning the images of a plurality of documents.
The reading mode to be carried out is switched from the second reading mode to the first reading mode.
The first scanning mode is performed from a document in which an image is scanned after the predetermined end condition is satisfied.
The predetermined end condition is a case where the user operates to switch from a state in which the specific setting information is input to a state in which the specific setting information is not input. .. A transport unit that can transport documents of different thickness,
A reading unit that reads an image of a document transported by the transport unit,
In an image reading device including a control unit that generates image data that is image data read by the reading unit.
When the original is conveyed by the conveying unit, the reading unit reads the image of the original at predetermined timings.
The control unit selects the first reading mode when the specific setting information is not input to the control unit, and the second reading mode when the specific setting information is input to the control unit. Select and
The control unit
In the first reading mode, an image is read by the reading unit from a document conveyed by the conveying unit at a speed corresponding to a required resolution, and image data of the image read by the reading unit is generated. ,
In the second reading mode, the image is read by the reading unit from the document conveyed by the conveying unit at a lower speed than in the case of the first reading mode, but the resolution of the image read by the reading unit is performed. By lowering the value, image data of an image having the same resolution as in the case of the first reading mode is generated.
The control unit switches the reading mode to be executed from the second reading mode to the first reading mode when a predetermined end condition is satisfied under the situation that the second reading mode is selected.
The predetermined end condition is an image reading device, characterized in that an image reading instruction based on the next job is input. The predetermined end condition is that the image reading instruction based on the next job is input, and the specific setting information is input from the state in which the specific setting information is input by the user's operation. The image reading device according to claim 3, wherein the image reading device includes the fact that the image has been switched to a non-existing state.

Images