JPH10243169A - Image reader and chart paper for setting read operation used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set accurately a read original feed amount from a sensing point of time by a original sensor till a read start point of time by an image pickup device in the image reader. SOLUTION: An original sensor 8 is placed between carrier rollers 4 along with a carrying path 2 and a read position 6a of an image sensor 6 and in contact with a tip of a read original 1 fed from the carrying path 4 to sense it that the read original 1 passes. The original sensor 8 is placed at a position deviated (position deviated to the right) from the middle of a chart paper sheet 10 in the breadthwise direction at a right angle to the carrying direction. On the other hand, A recognition mark 10a of the chart paper 10 is placed at a position deviated (position deviated to the right) from the middle of the chart paper sheet 10 in the breadthwise direction at a right angle to the carrying direction so as to be at a tip position of the chart paper 10 in contact with the original sensor 8 and the same as the position of the original sensor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus for setting a feeding amount of a read document from a detection position of a document sensor to a reading position of an image pickup device, and a chart sheet for setting a reading operation used in the image reading apparatus. About.

[0002]

2. Description of the Related Art Conventionally, this type of image reading apparatus is a reading apparatus provided in a facsimile apparatus or the like, and includes a transport roller for transporting a read original along a transport path, and a read original at a predetermined position on the transport path. An image sensor such as an image sensor for reading an image, a document sensor disposed upstream of the reading position of the image capturing device in the transport direction of the read document, and contacting the leading edge of the read document with an actuator mechanism or the like to detect the passage thereof, and a document sensor And a control circuit configured by a CPU or the like for setting the feed amount of the read original from the time of detection by the CPU to the time of start of reading by the imaging device.

The reading operation of the image reading apparatus will be described. When the conveyance of the read original is started by the rotation of the conveying roller, and when the original sensor detects the passage of the read original, the feed amount set in advance by the feed amount setting means is used. The read document is sent out until the reading start position of the read document reaches the reading position of the imaging device. Thereafter, the imaging device starts reading the read document at the reading position.

Therefore, in an image reading apparatus that performs such a reading operation, a chart sheet for setting a reading operation with a recognition mark is prepared, and this chart sheet is read by the image reading apparatus during manufacturing. Thus, the feed amount of the read document from the detection time of the document sensor to the reading start time of the imaging device is set. This setting of the sending amount is called a rear sensor adjustment.

More specifically, in the rear sensor adjustment, the chart sheet that has started to be conveyed comes into contact with the original document sensor and its passage is detected, and then the image pickup device sets the recognition mark on the chart sheet. read. The control circuit sets the feed amount of the read document from the time when the document sensor detects the document to the time when the image pickup device starts reading, based on the amount of conveyance of the chart paper from the time of detection by the document sensor to the time of reading by the imaging device.

[0006]

However, in the above-described conventional image reading apparatus, when the chart paper is read in a state where the chart paper is skewed with respect to the conveyance direction in the rear sensor adjustment, the passage of the chart paper is detected by the document sensor. The amount of chart paper conveyed from the point in time until the above-described recognition mark is read by the imaging device becomes inaccurate. There is a problem that it cannot be obtained.

More specifically, referring to FIG. 7, when the document sensor 40 is located at the right end in the width direction of the chart paper 41 and the recognition mark 41a is located at the left end in the width direction of the chart paper 41, When the paper 41 is skewed and conveyed in a state where the left end of the paper 41 advances, the original sensor
At the time point when 0 contacts the leading edge of the chart paper 41 and detects its passage, the recognition mark 41a
Has already passed the detection position, the transport amount of the chart paper 41 from the time point of detection by the document sensor 40 to the time point of reading by the imaging device becomes Y shown in the figure, and the actual detection position 40a of the read document. To reading position 4
It is smaller than the carry amount X up to 2.

As a result, there has been a problem that it is not possible to accurately set the feed amount of the read original from the detection time to the reading start time in the actual reading.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above points, and provides an image reading apparatus capable of accurately setting a feed amount of a read document from a time point detected by a document sensor to a time point at which reading is started by an imaging device. It is an object of the present invention to provide an apparatus and a chart sheet for setting a reading operation used for the apparatus.

[0010]

In order to achieve the above object, an image reading apparatus according to the first aspect of the present invention comprises a conveying means for conveying a read document along a conveying path, and a conveying means for conveying a read original at a predetermined position on the conveying path. An image pickup device for reading the read original by reading the read original, a document sensor disposed upstream of the read position of the image pickup device in the transport direction of the read original, and contacting the leading end of the read original to detect the passage of the read original; When the chart sensor for reading operation setting, which is provided with the recognition mark recognized by the device, is conveyed by the conveyance unit, the image pickup device starts the recognition from the time when the document sensor detects the passage of the chart paper. Based on the amount of chart paper transported until the mark is read, the time between the detection by the document sensor and the start of reading by the imaging device An image reading apparatus having a feeding amount setting means for setting the feed amount of the serial read document, the document sensor, are arranged in the passage position of the recognition mark in the width direction of the chart paper.

According to this image reading apparatus, since the document sensor is disposed at the position where the recognition mark passes in the width direction of the chart paper, the document sensor is read in a state where the chart paper is skewed in the transport direction. However, the conveyance amount of the chart paper from the time when the document sensor contacts the chart paper and detects the passage of the chart paper to the time when the imaging device reads the recognition mark attached to the chart paper is the same as that when the document is not skewed. Therefore, based on the transport amount of the chart paper, the feed amount of the read document from the detection time by the document sensor to the reading start time by the imaging device is accurately set by the feed amount setting means.
As a result, it is possible to accurately absorb variations in the feed amount of the read document from the detection time to the reading start time in each image reading apparatus. Further, when setting the above-mentioned feed amount, since the chart paper may be read in any state in the transport direction, the setting operation can be performed efficiently without correcting the transport direction.

The transporting means may be a means for transporting the read original by rotating a transport roller or the like, but is not particularly limited thereto.

The image pickup device may be a contact image sensor (hereinafter, referred to as "CIS") or the like, but is not particularly limited thereto.

The original sensor may be a sensor that outputs an on / off detection signal by an actuator mechanism or the like, but is not particularly limited to this.

[0015] The image reading apparatus according to the second aspect of the present invention,
2. The image reading device according to claim 1, wherein the document sensor is arranged at a contact position displaced from a center in a width direction of the chart paper. 3.

According to this image reading apparatus, in addition to the effect of the image reading apparatus according to the first aspect, the document sensor further comprises:
Since it is arranged at the contact position displaced from the center in the width direction of the chart paper, the leading end of the chart paper at the contact position is less likely to bend, so that passage of the chart paper can be reliably detected by the document sensor. .

The chart sheet for setting a reading operation used in the image reading apparatus according to the third aspect of the present invention includes an image pickup device for reading a read original in a transport state, and an upstream side in the transport direction of the read original from the reading position of the imaging device. The document is read by an image reading device that includes a document sensor that detects the passage of the read document by contacting the leading edge of the read document, and a recognition mark for causing the imaging device to recognize the read document is attached. When read by the image reading device,
A chart sheet for setting a reading operation used in an image reading apparatus, which is used for measuring a transport amount from a point when passage of the document is detected by the document sensor to a point when the recognition mark is read by the imaging device. The recognition mark is attached to the position of contact with the document sensor in the width direction of the chart paper.

According to the chart sheet for reading operation setting used in the image reading apparatus, the recognition mark read by the image pickup device is attached to the position in contact with the original sensor in the width direction of the chart sheet. Even when the paper is read while being skewed with respect to the transport direction, from the time when the document sensor contacts the chart paper and detects the passage, until the time when the imaging device reads the recognition mark attached to the chart paper. Since the transport amount of the chart paper is the same as when the paper is not skewed, the feed amount of the read document from the detection time of the document sensor to the reading start time of the imaging device is based on the transport amount of the chart paper. Is accurately set by the delivery amount setting means. As a result, it is possible to accurately absorb variations in the feed amount of the read document from the detection time to the reading start time in each image reading apparatus. Further, when setting the above-mentioned feed amount, since the chart paper may be read in any state in the transport direction, the setting operation can be performed efficiently without correcting the transport direction.

A chart sheet for setting a reading operation used in the image reading apparatus according to the fourth aspect is the chart sheet according to the third aspect, wherein the recognition mark is located at the center of the chart sheet in the width direction. It is arranged at a contact position with the displaced original sensor.

According to the chart sheet for setting the reading operation used in the image reading apparatus, in addition to the effect of the chart sheet according to claim 3, the recognition mark is formed by a document sensor displaced from the center in the width direction of the chart sheet. Is located at the contact position, the leading end of the chart paper is less likely to bend at the contact position, so that passage of the chart paper can be reliably detected by the document sensor.

Further, the chart paper for reading operation setting used in the image reading apparatus according to claim 5 is the chart paper according to claim 3 or 4, wherein the recognition mark is the chart paper of the chart paper. It is attached to the tip.

According to the chart sheet for setting a reading operation used in this image reading apparatus, in addition to the effect of the chart sheet according to claim 3 or 4, the recognition mark is
Because the difference between the distance from the leading edge of the chart paper to the recognition mark and the distance from the leading edge of the read document to the reading start position is small because the label is attached to the leading edge of the chart paper, it is necessary to correct the difference between the two. Is small, and the chart paper can be used in common even when the distance from the leading edge of the read document to the reading start position is different for each model.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic side view showing a main part of an image reading apparatus according to the present invention, and FIG. 2 is a diagram showing a state of conveying a chart sheet for setting a reading operation used in the image reading apparatus according to the present invention. FIG. 3 is a circuit block diagram of a facsimile apparatus equipped with the image reading apparatus according to the present invention, and FIG. 4 is a flowchart showing a chart sheet reading procedure of the image reading apparatus according to the present invention. FIG. 5 is a top view of a conveyance state showing a skewed conveyance state of the chart paper according to the present invention, and FIG. 6 is a flowchart showing a reading procedure of a document to be read by the image reading apparatus according to the present invention.

As shown in FIGS. 1 to 3, an image reading apparatus according to the present invention is a reading apparatus provided in a facsimile apparatus, and includes a paper feed roller 3 for feeding a read original 1 to a transport path 2; A transport roller 4 for transporting the original 1 along the transport path 2, a discharge roller 5 for discharging the read original 1 transferred by the transport roller 4, and an image of reading the original 1 at a predetermined position on the transport path 2 A sensor 6, an LED array 7 for irradiating light to a reading position 6a of the image sensor 6, and an LED array 7 arranged upstream of the reading position 6 of the image sensor 6 in the transport direction. A document sensor 8 for detection and a control circuit 9 for controlling the transport roller 4 and the like during a reading operation are provided.

The chart paper 10 for setting a reading operation used in the image reading apparatus according to the present invention is read by the image reading apparatus in order to set a reading operation at the time of manufacture. As shown in FIG. The recognition mark 10a to be read by the image sensor 6 has a color different from the background color of the chart paper 10 at a part of the leading end position in the transport direction. . More specifically, the recognition mark 10
a is the leading end position of the chart paper 10 in contact with the document sensor 8 and a position displaced from the center in the width direction perpendicular to the conveying direction of the chart paper 10 so as to be the same as the position of the document sensor 8. (In FIG. 2, the position is displaced to the right.) In addition, the recognition mark 10a
Is also attached to a position opposite to the recognition mark at the leading end (in FIG. 2, a position displaced to the left) at the rear end position of the chart paper 10 so that the chart paper 10 may be conveyed from either the front or the back. ing.

The paper feed roller 3 is located at the end of the transport path 2 and pulls in the read originals 1 placed on the original tray 11 one by one by the driving force of a stepping motor (not shown) controlled by the control circuit 9. To the transport path 2.

The transport roller 4 is disposed along the transport path 2 between the paper feed roller 3 and the detection position 8a of the document sensor 8, and is driven by a driving force of a stepping motor (not shown) controlled by the control circuit 9. After the leading end of the read original 1 transported from the paper feed roller 3 is pulled in a state in which the two are in close contact with each other, the paper discharge roller on the downstream side in the transport direction passes through the detection position 8a and the read position 6a of the image sensor 6. Convey to 5.

The paper discharge roller 5 is located at the rear end of the transport path 2 and is driven by a stepping motor (not shown) controlled by the control circuit 9 so that the two rollers are brought into close contact with each other in the transport direction on the upstream side in the transport direction. Scanned document 1 transferred from 4
Then, the sheet is discharged onto the sheet discharge tray 12.

The image sensor 6 is an image pickup device composed of an image pickup device such as a CIS. The image sensor 6 applies an LE to the read original 1 sent to the read position 6a by the transport roller 4.
When light is irradiated from the D array 7, the read original 1 is scanned in a direction perpendicular to the conveying direction (in FIG. 1, a direction penetrating the drawing), and the reflected light is converted into an electric read signal. And outputs it to the control circuit 9.

The original sensor 8 is disposed between the transport roller 4 along the transport path 2 and the reading position 6 a of the image sensor 6. When the original sensor 8 comes into contact with the leading end of the read original 1 sent out from the transport path 4, the actuator is actuated. The mechanism operates and outputs an ON signal to the control circuit 9 to detect that the read original 1 passes. On the other hand, when the read document 1 is not present at the detection position 8a, the OFF signal is output from the document sensor 8 to the control circuit 9 because the actuator mechanism does not operate. Further, the document sensor 8 is disposed at a position displaced from the center in the width direction perpendicular to the transport direction of the read document 1 (in FIG. 2, a position displaced rightward).

The control circuit 9 also controls other functional operations of the facsimile apparatus. As shown in FIG.
U21, NCU22, RAM23, modem 24, ROM
25, an EEPROM 26, a gate array 27, a codec 28, and a DMAC 29. CPU2
1, NCU 22, RAM23, modem 24, ROM2
5, the EEPROM 26, the gate array 27, the codec 28, and the DMAC 29 are mutually connected by a bus line. The bus lines include an address bus, a data bus,
And a control signal line. In the gate array 27,
Reading unit 31, recording unit 32, operation unit 33, and display unit 3
4 are connected. The NCU 22 is connected to a telephone line 41 as an example of a communication line.

The CPU 21 controls the entire facsimile machine. The NCU 22 is connected to the telephone line 41 and performs network control. The RAM 23 stores various data. The modem 24 performs modulation of transmission data and demodulation of reception data. The ROM 25 stores various programs and the like. The EEPROM 26 stores various data and flags. The gate array 27 functions as an input / output interface of the CPU 21. Codec 28
Performs encoding of transmission facsimile data and the like. DM
The AC 29 writes and reads data to and from the RAM 23. The reading unit 31 includes a paper feed roller 3, a transport roller 4, a paper discharge roller 5, an image sensor 6, an LED array 7, and a document sensor 8, and outputs a signal output from each device to the gate array 27. . The recording unit 32 records a received image and the like. The operation unit 33 includes a key switch group and the like, and outputs a signal according to a user operation. The display unit 34 includes an LCD or the like, and
Various displays are performed under the control of 21.

To further explain the point, when reading the chart paper 10 by the image reading device, the CPU
21 outputs a drive request signal to a stepping motor (not shown) such as the transport roller 4 and inputs an ON signal from the document sensor 8 when the leading end of the chart paper 10 is detected, and based on the ON signal The counting of the number of steps of the conveying roller 4 is started, and a reading signal is input from the image sensor 6 when the recognition mark 10a of the chart paper 10 is read, and the counting of the number of steps of the conveying roller 4 is performed based on the reading signal. After completion, the transport amount of the chart paper 10 is calculated based on the counted number of steps, and the document sensor 8 is calculated based on the calculated transport amount of the chart paper 10.
Then, the feed amount of the read original 1 from the time point of detection by the image sensor 6 to the start time of reading by the image sensor 6 is calculated, and the calculated feed amount is stored in the EEPROM 26. That is, the CPU 21 implements a feed amount setting unit that sets the feed amount of the read document 1 from the time when the document sensor 8 detects the image to the time when the image sensor 6 starts reading.

Next, the essential points of the operation of the image reading apparatus thus configured will be described with reference to FIGS.

First, a so-called rear sensor adjustment for setting the feed amount of the read original 1 from the detection time to the reading start time using the chart paper 10 will be described. As shown in FIG. When the reading of the paper 10 is started, the CPU 21 outputs a drive request signal to the stepping motor, whereby the paper feed roller 3 rotates and the chart paper 1 on the document tray 11 is rotated.
0 is drawn into the transport path 2 (S1).

When the feed roller 3 rotates a predetermined number of steps and the leading end of the chart paper 10 is transported along the transport path 2 to the inlet of the transport roller 4, the CPU 21 determines the number of steps of the feed roller 3 , A drive request signal is output to the stepping motor, and the transport roller 4 rotates (S2).

When the transport roller 4 starts rotating, the chart paper 10 is transported along the transport path 2 to the detection position 8a of the original sensor 8 while the leading end of the chart paper 10 is drawn into the transport roller 4, and the CPU 21 causes the CPU 21 to detect the original document. It is determined whether an ON signal has been input from (S3). That is, the leading edge of the chart paper 10 contacts the document sensor 8 at the detection position 8a, and when the document sensor 8 detects the passage of the chart paper 10, an ON signal is output from the document sensor 8 to the CPU 21. At this time, the leading end of the chart paper 10 has a free end, but the leading end position displaced from the center in the width direction of the chart paper 10 (the position displaced rightward in FIG. 5) is the free end. Since it becomes difficult to bend even after that, the leading end of the chart paper 10 surely comes into contact with the document sensor 8.

When an ON signal is input from the document sensor 8 (S3: YES), the CPU 21 starts counting the number of steps of the transport roller 4 (S4).
Is rotated and the leading end of the chart paper 10 is
Is conveyed to the reading position 6a, and the CPU 21 determines whether a reading signal is input from the image sensor 6 (S
5). That is, when the recognition mark 10a attached to the leading end of the chart paper 10 reaches the reading position 6a of the image sensor 6, a reading signal is output from the image sensor 6 to the CPU 21 when the image sensor 6 reads the recognition mark 10a. You.

When a reading signal is input from the image sensor 6 (S5: YES), the CPU 21 ends counting the number of steps of the transport roller 4 (S6). The number of steps of the transport roller 4 is a physical quantity corresponding to the transport amount of the chart paper 10 from the time when the document sensor 8 detects the time until the time when the image sensor 6 starts reading. Then, the CPU 21 calculates the number of steps corresponding to the feeding amount of the read document 1 from the time when the document sensor 8 detects the image to the time when the image sensor 6 starts reading, based on the number of steps, and stores the calculated number in the EEPROM 26 (S7). ). That is,
If the position of the recognition mark 10a on the chart paper 10 matches the reading start position on the reading document 1, the above calculation is unnecessary, but if not, the calculation is performed to correct the difference. It is.

Here, when reading the chart paper 10,
Depending on the conveyance state, as shown in FIG. 5, the chart paper 10 may be conveyed obliquely with respect to the conveyance direction, but the recognition mark 10a at the leading end of the chart paper 10 is detected by the detection position 8a of the document sensor 8. , The amount of movement of the recognition mark 10a and the amount of movement of the leading end of the chart paper 10 coincide with each other.
The number of steps of the transport roller 4 stored in 6 is constantly counted even in a skewed state or a normal state.

Further, when the transport roller 4 rotates and the leading edge of the chart paper 10 is transported to the inlet of the paper discharge roller 5, the CPU 21 outputs a drive request signal to the stepping motor, so that the paper discharge roller 5 is driven. By rotating the discharge roller 5 by a predetermined number of steps until the chart paper 10 is discharged onto the discharge tray 12 (S8), the CPU
21 ends this main routine.

In S5, if no read signal is input from the image sensor 6 (S5: NO), the CPU 2
1 returns to S5 and waits until a read signal is input.

In S3, if the ON signal is not input from the document sensor 8 (S3: NO), the CPU 21
Returns to S3 and waits until an ON signal is input.

Next, the case where the original 1 is actually read will be described. As shown in FIG. 6, when the reading of the original 1 is started by the image reading apparatus, the CPU 21
By outputting a drive request signal to the stepping motor,
The paper feed roller 3 rotates to read the original 1 on the original tray 11.
Is drawn into the transport path 2 (S11).

When the feed roller 3 rotates by a predetermined number of steps and the leading end of the read original 1 is transported along the transport path 2 to the inlet of the transport roller 4, the CPU 21 determines the number of steps of the feed roller 3. , A drive request signal is output to the stepping motor, and the transport roller 4 rotates (S1).
2).

When the transport roller 4 starts rotating, the read original 1 is transported along the transport path 2 to the detection position 8a of the original sensor 8 while the leading end of the read original 1 is drawn into the transport roller 4, and the CPU 21 receives the original document from the original sensor 8. It is determined whether an ON signal has been input (S13). That is, the CPU 21
Indicates that the leading edge of the read original 1 is at the detection position 8a
And whether the original sensor 8 has detected passage of the original 1 to be read.

When an ON signal is input from the document sensor 8 (S13: YES), the CPU 21 calls the predetermined number of steps of the transport roller 4 stored in the EEPROM 26 in advance by the above rear sensor adjustment, and further calls the predetermined number of steps. It is determined whether the transport roller 4 has rotated based on the number of steps (S14). That is, when the transport roller 4 rotates based on the number of steps stored in the EEPROM 26 in S7, the reading start position at the leading end of the read original 1 is just
The reading amount of the read original 1 from the detection time to the reading start time is determined as the predetermined number of steps of the transport roller 4 by EEPRO.
It will be set to M26.

If the conveying roller 4 has been rotated a predetermined number of steps (S14: YES), the reading start position of the read original 1 is exactly located at the reading position 6a of the image sensor 6, and the CPU 21 controls the LED array 7 It drives to irradiate the reading position 6a with light, and starts reading processing by the image sensor 6 (S15).

When the reading process is completed, the CPU 21 rotates the discharge roller 5 until the read document 1 is discharged onto the discharge tray 12 (S16), and ends the main routine.

In S14, if the transport roller 4 has not been rotated a predetermined number of steps (S14: NO), the CPU 2
1 returns to S14 and waits until the transport roller 4 rotates a predetermined number of steps.

In S13, if no ON signal is input from the document sensor 8 (S13: NO), the CPU 2
1 returns to S13 and waits until an ON signal is input.

According to such an image reading apparatus and chart paper, since the detection position 8a of the document sensor 8 coincides with the position where the recognition mark 10a of the chart paper 10 passes, the chart paper 10 is moved in the transport direction. Even when the document is read in a skewed state, the time from when the document sensor 8 contacts the chart paper 10 to detect the passage of the chart paper 10 to the time when the image sensor 6 reads the recognition mark 10 a attached to the chart paper 10. The transport amount of the chart paper 10 is the same as when the paper is not skewed. Therefore,
The feed amount of the read document 1 from the time when the document sensor 8 detects the image to the time when the image sensor 6 starts reading is CP.
It is set accurately by U21 or the like.

In other words, the above effect can be obtained because the recognition mark 10a of the chart paper 10 read by the image sensor 6 is attached to a position where the tip of the chart paper 10 contacts the original sensor 8.

As a result of the above, the read original 1 from the detection time to the reading start time in each image reading apparatus is read.
Can be accurately absorbed.

Further, when setting the above-mentioned feeding amount,
Since the chart paper 10 may be read in any state with respect to the transport direction, the chart paper 10 can be read efficiently without correcting the transport direction.

The original sensor 8 is connected to the chart paper 10
The contact position displaced from the center in the width direction (in FIG. 5,
(The position displaced to the right), the leading end of the chart paper 10 at the contact position is unlikely to bend even if it becomes a free end. Therefore, the passage of the chart paper 10 is reliably detected by the document sensor 8. be able to.

In other words, the recognition mark 10a of the chart paper 10 is disposed at a contact position with the original sensor 8 displaced from the center of the chart paper 10 in the width direction (in FIG. 5, a position displaced rightward). Thereby, the above effect can be obtained.

Further, the recognition mark 1 on the chart paper 10
Since 0a is attached to the leading end of the chart paper 10,
Since the difference between the distance from the leading end of the chart paper 10 to the recognition mark 10a and the distance from the leading end of the read original 1 to the reading start position is small, the error caused by correcting the difference between the two is small, and the read original is small. Even in the case where the distance from the leading end to the reading start position differs for each model, the chart paper 10 can be used in common.

In the above-described embodiment, the paper feed roller 3, the transport roller 4, and the paper discharge roller 5, which are rotated by the driving force of the stepping motor, serve as transport means, the image sensor 6 serves as an imaging device, and the original sensor 8 serves as an actuator. It operates by a mechanism, but is not particularly limited to these.

In the above embodiment, the recognition mark 10
Although a is attached to the leading end of the chart paper 10, this is not always necessary. For example, the distance from the leading edge of the chart paper 10 to the recognition mark 10a may be the same as the distance from the leading edge of the read document 1 to the reading start position,
This eliminates the need for a calculation for correcting the difference between the two distances.

[0062]

As described above, according to the image reading apparatus of the first aspect of the present invention, since the document sensor is disposed at the position where the recognition mark passes in the width direction of the chart paper, the chart paper can be used. Even when the document is read while being skewed with respect to the transport direction, the time from when the document sensor contacts the chart paper to detect the passage of the chart paper to when the imaging device reads the recognition mark attached to the chart paper. Since the transport amount of the chart paper is the same as when the paper is not skewed, based on the transport amount of the chart paper, the feed amount of the read document from the detection time by the document sensor to the start of reading by the imaging device is determined. , Is accurately set by the feeding amount setting means. As a result, it is possible to accurately absorb variations in the feed amount of the read document from the detection time to the reading start time in each image reading apparatus. Further, when setting the above-mentioned feed amount, since the chart paper may be read in any state in the transport direction, the setting operation can be performed efficiently without correcting the transport direction.

According to the image reading apparatus of the second aspect of the invention, in addition to the effect of the image reading apparatus of the first aspect, in addition to the effect that the original sensor is displaced from the center in the width direction of the chart paper. Since the sheet is disposed at the position, the leading end of the chart sheet is hardly bent at the contact position, so that the passage of the chart sheet can be reliably detected by the document sensor.

Further, according to the chart sheet for setting the reading operation used in the image reading apparatus according to the third aspect of the present invention, the position where the recognition mark read by the imaging device contacts the original sensor in the width direction of the chart sheet. Even when this chart paper is read while being skewed with respect to the transport direction, the imaging device contacts the chart paper and detects the passage of the chart paper. Since the transport amount of the chart paper up to the point at which the attached recognition mark is read is the same as when the paper is not skewed, the chart device transports the chart paper based on the transport amount of the chart paper from the detection point by the document sensor to the reading by the imaging device The feed amount of the read document up to the start point is accurately set by the feed amount setting means. As a result, it is possible to accurately absorb variations in the feed amount of the read document from the detection time to the reading start time in each image reading apparatus. Further, when setting the above-mentioned feed amount, since the chart paper may be read in any state in the transport direction, the setting operation can be performed efficiently without correcting the transport direction.

According to the chart sheet for setting a reading operation used in the image reading apparatus according to the present invention,
In addition to the effect of the chart paper according to claim 3, since the recognition mark is arranged at a contact position with the document sensor displaced from the center in the width direction of the chart paper, the leading end of the chart paper at the contact position, Since the document is hardly bent, the passage of the chart paper can be reliably detected by the document sensor.

Further, according to the chart sheet for setting the reading operation used in the image reading apparatus of the invention according to the fifth aspect, in addition to the effect of the chart paper according to the third or fourth aspect, the recognition mark can be formed. Is attached to the leading edge of the chart paper, the difference between the distance from the leading edge of the chart paper to the recognition mark and the distance from the leading edge of the read document to the reading start position is small. Therefore, even if the error caused by the error is small and the distance from the leading edge of the read document to the reading start position is different for each model, the chart paper can be used in common.

[Brief description of the drawings]

FIG. 1 is a schematic main part side view showing a main part side surface of an image reading apparatus according to the present invention.

FIG. 2 is a top view of a reading state showing a conveying state of a chart sheet for setting a reading operation used in the image reading apparatus according to the present invention.

FIG. 3 is a circuit block diagram of a facsimile apparatus equipped with the image reading apparatus according to the present invention.

FIG. 4 is a flowchart showing a procedure for reading chart paper by the image reading apparatus according to the present invention.

FIG. 5 is a top view of a conveyance state showing a skewed conveyance state of the chart paper according to the present invention.

FIG. 6 is a flowchart showing a reading procedure of a document to be read by the image reading apparatus according to the present invention.

FIG. 7 is a top view of a conveying state showing a skewed conveying state of chart paper in a conventional image reading apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reading original 4 Conveyance roller 6 Image sensor 6a Reading position 8 Original sensor 8a Detection position 9 Control circuit 10 Chart paper 10a Recognition mark

Claims (5)

[Claims] A transport unit configured to transport the read original along a transport path; an imaging device that reads the read original at a predetermined position on the transport path; and an upstream side in the transport direction of the read original from the reading position of the imaging device. A document sensor that is arranged in contact with the leading edge of the read document and detects the passage of the read document; and a chart sheet for reading operation setting with a recognition mark recognized by the imaging device is transported by the transport unit. Accordingly, based on the conveyance amount of the chart paper from the time when the document sensor detects the passage of the chart paper to the time when the imaging device reads the recognition mark, the imaging device is detected from the detection time by the document sensor. And a feed amount setting means for setting a feed amount of the read document up to a time point at which the reading operation is started. An image reading apparatus, wherein the document sensor is arranged at a position where the recognition mark passes in the width direction of the chart paper. 2. The image reading apparatus according to claim 1, wherein the document sensor is disposed at a contact position displaced from a center of the chart sheet in a width direction. 3. An image pickup device for reading a read original in a transport state, and disposed upstream of the read position of the image pickup device in the transport direction of the read original, and detects the passage of the read original by contacting the leading end of the read original. While being read by an image reading device including a document sensor, a recognition mark for causing the image pickup device to recognize the image reading device is attached, and when reading by the image reading device, from the time when passage is detected by the document sensor, A chart sheet for setting a reading operation used for an image reading apparatus, which is used for measuring a transport amount up to a point in time when the recognition mark is read by the imaging device, wherein the recognition mark is a width of the chart sheet. A reading operation setting chart for use in an image reading apparatus, wherein Paper. 4. A chart for setting a reading operation used in the image reading apparatus according to claim 3, wherein the recognition mark is arranged at a contact position with the document sensor displaced from a center in the width direction of the chart paper. Paper. 5. The chart sheet for reading operation setting used in the image reading apparatus according to claim 3, wherein the recognition mark is attached to a leading end of the chart sheet.