JP3514204B2 - Image reading device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device suitable for a so-called electronic bulletin board and the like, and a storage medium storing a program for controlling the image reading device.

[0002]

2. Description of the Related Art A so-called electronic bulletin board is a contact-type image scanner (hereinafter referred to as "Cont") for reading images such as characters and figures written on a writing sheet with a felt pen.
Act Image Scanner is abbreviated as “CIS”. ),
A thermal printer for recording an image obtained by CIS on a recording sheet is provided.

In this type of electronic bulletin board, an endless annular writing sheet is used in order to enable repeated writing. This writing sheet is formed by bonding both ends of one sheet to each other with a bonding tape and connecting them. The outer peripheral surface of the writing sheet serves as a writing surface, while the inner peripheral surface of the writing sheet moves around. The pair of rollers are arranged in close contact with each other. The writing sheet is always pulled in a fixed direction by the pair of rollers, and the writing sheet has a posture in which approximately half of the outer peripheral surface faces the front as one writing surface. That is, the writing sheet is moved by a half circumference by rotating the roller via a motor or the like, and at this time, the image is read from the outer peripheral surface of the writing sheet by CIS. The image read via the CIS is recorded on the recording paper on the spot via the thermal printer, and a copy is made every time a half circumference of the writing sheet is moved.

In order to realize such a copying operation, a mark for specifying the reading start position and the like is provided in addition to the writing portion on almost every half circumference of the writing sheet, and one of these marks is used. The roller is rotated via the motor until the next mark is detected after the CIS detects the writing sheet, and the writing sheet can be surely moved by a half turn in one copy. Therefore, each time one copy is completed, the image written on the outer half of the outer peripheral surface of the writing sheet is recorded, and one of the marks that has been added separately from the image is near the position where the CIS starts the next reading. To reach. In other words, the writing sheet moves by about half a turn each time one copy is completed, and the same inner peripheral surface portion is always in close contact with any of the rollers.

[0005]

However, when an image is read by moving the writing sheet around every half turn as described above, the same portion is always formed on the inner peripheral surface of the writing sheet every time the image is read. It was brought into close contact with the roller, and due to the relationship between the writing sheet and the roller, the same part of the writing sheet was pressed against the roller and semipermanently left a trace. The trace portion of such a writing sheet is considered to be a cause of not being able to move the writing sheet in good condition because it acts as a load on the roller when the writing sheet starts to move circularly at the start of image reading. For example, even if the roller starts to rotate for copying, the trace portion of the writing sheet cannot pass through the roller, resulting in a problem that the roller idles or the sheet stagnates.

In addition, before the start of copying, the writing sheet may be moved by the user by shifting it by hand. In such a case, the trace portion of the writing sheet is rolled by the roller when it starts to move around. There was a case where it came to a position facing the roller for the first time during the movement, instead of being positioned at a position opposite to. Then, depending on the driving force of the motor in the steady state, the rotational force of the roller is weak, so that the trace-shaped portion that is a load cannot pass through the roller, and the writing sheet may not be able to move around smoothly.

The present invention has been proposed in view of the above points, and it is possible to smoothly move the sheet to the end even if the sheet starts to move from any stop state. An object of the present invention is to provide a reading device and a storage medium storing a program for controlling the image reading device.

[0008]

To achieve the above object, according to the Invention The, the image reading apparatus of the invention described in claim 1, flat
A pair of rollers arranged in a row and tension between these rollers
Endless, which is hung and marked with two marks every half circumference
An annular sheet and a driving hand that drives one of the roller pairs.
It is placed at the position facing the step and one roller, and
It has a reading unit to read the image drawn on the outer surface of the
Then, the above-mentioned pair of rollers divides the above-mentioned sheet by about half a turn
While moving the image drawn on the outer peripheral surface of the sheet
In the image reading device that is read by the reading unit,
There are three types of driving means: low level, medium level and high level.
The driving force of the seat can be switched, and
When one of the marks is detected by the reading means at the beginning
Drive the drive means with a high level drive force.
Drive at a low level after moving the motor around a predetermined amount
Move the above sheet around the specified line by
The middle label is read until the other side of the mark is detected by the reading means.
A drive control hand that moves the seat around by the driving force of the bell.
And the driving force of the driving means is switched to a low level.
At the timing of
Start reading and wait for the other of the above marks to be detected.
Reading control means for stopping the reading of the image in question
And are provided .

[0009]

[0010]

According to such an image reading apparatus, when the movement of the sheet is started from the state where the traced portions by the conveying mechanism face each other, the movement of the sheet can be started smoothly.

Further, the image reading apparatus of the invention described in claim 2, an image reading apparatus according to claim 1, said drive control means, the circular movement start of the sheet
If one of the marks is not detected by the reading means
Drive the drive means with a high level drive force.
Drive at a medium level after the board has been moved by a predetermined amount.
Cycle the sheet until the mark is detected twice.
The reading control means causes the sheet to circulate and open.
At the beginning, one of the marks is not detected by the reading means.
At this time, the driving force of the driving means is switched to the medium level.
At the timing of
The reading is started, and the above sheet is moved around half a circle.
It is special to stop the reading of the image at the timing
To collect.

According to such an image reading device, in addition to the effect of the image reading device according to claim 1 ,
Usually, since the circulating movement of the sheet near the mark sheet as the reading start position is started, it becomes possible to trace is formed by the transfer mechanism in the vicinity of the mark, move the seat user and to shift manually When the circular movement starts after the circular movement, the trace-shaped portion comes to a position facing the transport mechanism during the circular movement. Therefore, when the mark is not detected by the reading means when the orbiting movement starts, it is determined that the trace portion comes to a position facing the transport mechanism during the orbiting movement. By controlling the driving force of the driving means to a medium level or higher until the end , the sheet can circulate well without causing any trouble even when the trace portion of the sheet passes through the transport mechanism in the middle of the circular movement. It can be moved. In other words, since the conveyance force of the conveyance mechanism is kept at a medium level from the start of the circular movement of the sheet to the stop, the sheet can be circularly moved to the end gracefully no matter which section in the middle of the movement has a trace portion. be able to.

An image reading apparatus according to a third aspect of the present invention is the image reading apparatus according to the second aspect, wherein the reading means has a plurality of colors from the outer peripheral surface of the sheet.
The drive control means can read the
The above drive means is
Drives with a level driving force to orbit the above seat by a predetermined amount
After moving, switch to a low level driving force and
Orbit until the first mark is detected,
After switching to the middle-level drive force, the seat is
After making a circular movement for only one minute, switch to the low level driving force again.
When the above-mentioned sheet is moved around a half turn,
Switch to the driving force of the bell and mark the above sheet for the second time.
The orbital movement is continued until is detected, and the reading control means
When reading the image on the sheet in multiple colors,
The timing of the stage drive is first switched to low level.
Read the image on the sheet by the reading means.
Start, and the seat is moved around half a circle
It is characterized in that the reading of the image is stopped by the operation.

According to such an image reading apparatus, double
It takes more time to scan several colors than monochrome scanning.
In addition, it is necessary to increase the transport force of the transport mechanism.
Operation sound when the driving force of the moving means is controlled at a medium level or higher
Is larger than when driving at low level,
Continues to increase the transport force of the transport mechanism when reading
Then, the state where the operation noise is loud may continue for a long time.
And Therefore, in case of multi-color reading, the sheet
The transport force by the transport mechanism is increased when starting to move around
After setting the driving force of the driving means to a high level so that
If the level is low when scanning starts
It is possible to prevent the state from continuing. Also the image
If one of the marks is detected while reading the
Switch the power to the medium level, move the sheet to the extent that the traced part passes the roller , and then again.
Since it returns to a low level, it is possible to increase the roller's rotational force before and after the detection of a mark where the traced portion faces the roller and the load becomes large, and after the traced portion has overwhelmed the roller, the sheet turns around. It is possible to reduce the operating noise accompanying movement to a steady state.

[0016]

[0017]

[0018]

[0019]

Further, the image reading device of the invention described in claim 4 is the image reading device according to claim 1 or 2 , wherein the sheet is joined to form an endless ring.
With the tape attached, one of the marks above
It is provided near the attachment position of the joining tape,
A high level of driving force is applied to the seat at the start of the circular movement of the seat.
The predetermined amount of orbital movement of the seat is at least
Move the bonding tape pasting position past the roller
It is characterized by being a quantity. In addition, it is stated in claim 5.
The image reading device of the invention is the image reading device according to claim 3.
It is a take-off device and has an endless annular shape on the sheet.
The bonding tape on the
One is provided near the attachment position of the joining tape.
With a high level of driving force,
A predetermined amount by which the sheet is orbitally moved and the drive of the drive means.
The power is switched to the medium level and the seat moves around.
The amount of movement of the predetermined line is at least the above
The bonding tape sticking position of the sheet passes the above roller
It is characterized by the amount of movement.

According to such an image reading apparatus, even if a bonding tape that prevents the movement of the sheet is stuck to the sheet as in the traced portion , there is no need to use such a bonding tape. The seat can be smoothly moved around without causing any trouble.

[0022]

[0023]

Further, the image reading device of the invention described in claim 6 is the image reading device according to any one of claims 1 to 5 , wherein the images obtained by the reading means are sequentially recorded on recording paper. It has a recording means for recording with respect to.

According to such an image reading device, in addition to the effect of the image reading device according to any one of claims 1 to 5 , the image read by the reading device is recorded by the recording device on the spot. It is possible to realize a copy function such as recording with.

[0026]

[0027]

[0028]

[0029]

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic perspective view showing the appearance of an electronic bulletin board having a copying function as an embodiment of the image reading apparatus according to the present invention. As shown in the figure, the electronic bulletin board A includes a writing sheet S, a bulletin board case 1 for accommodating the writing sheet S, a driving roller 2 and a driven roller 3 for moving the writing sheet S in an orbit, a contact type image scanner (CIS). ) 4, a main body case 5 having a built-in thermal printer, and a control circuit described later.

The writing sheet S, like a so-called whiteboard, enables writing of characters and figures with a felt pen such as black and red, and has an endless annular shape with a certain width when viewed from the side. The outer peripheral surface is used as the writing surface. On the outer peripheral surface of the writing sheet S, two marks (not shown) for specifying the reading start position are provided approximately every half circumference. The mark is attached to a part of the bulletin board case 1 that cannot be seen from the outside, and is detected by being read by the CIS 4 described later. Further, in the vicinity of the mark position, a joining tape (not shown) is attached along the width direction in order to connect both ends of one sheet to each other to form an endless annular writing sheet S.

The bulletin board case 1 is one in which the writing sheet S has a substantially half-circumferential surface exposed to the outside through the writing window 1a, and in the case, the writing sheets S are in close contact with the inner peripheral surfaces of the rollers 2, 3 It is stored in a state of being pulled up and down by. Further, inside the bulletin board case 1, a stepping motor (not shown) for rotating the drive roller 2 and the like are also incorporated in addition to the CIS 4 and the like.

The drive roller 2 and the driven roller 3 are for moving the writing sheet S in a circular manner.
Rotates while following the writing sheet S, while the drive roller 2 directly rotates via a stepping motor, and the drive roller 2, the driven roller 3, and the stepping motor form a transport mechanism. The stepping motor for rotating the drive roller 2 can be controlled by a control circuit described later so as to generate a driving force in three stages of high, medium, and low, for example. As such a stepping motor, one- and two-phase excitation type motors are used. For example, when the driving force is the highest, both the 1st and 2nd phases are 100%. When the driving force is 70% and the lowest driving force, the motor current is controlled by the CPU, which will be described later, so as to be 70% for one phase and 33% for two phases.

The CIS 4 is arranged above the driven roller 3 provided on the inner peripheral side of the upper portion of the writing sheet S,
An image such as characters and figures written on the writing sheet S is read line by line along the width direction according to the amount of reflected light. Further, the CIS 4 can read the image on the writing sheet S for each color, and for that purpose, LEDs (not shown) whose emission colors are yellow and red are used as a light source. Specifically, when the image is read line by line from the writing sheet S via the CIS 4, the yellow and red LEDs are exclusively turned on / off during the reading of the line. When the yellow LED emits light, the red and black parts are recognized equally by the light receiving element of the CIS4, while when the red LED emits light, only the black part is recognized. The CPU, which will be described later, performs arithmetic processing on the recognition patterns obtained for each of these luminescent colors to extract the red portion. The black portion is extracted based on the amount of reflected light obtained when only the red LED is made to emit light.

The main body case 5 is provided in the lower part of the bulletin board case 1, and inside thereof, not shown, a thermal printer, recording paper (thermal paper), a recording motor for moving the recording paper, and the like, A control circuit described later and the like are stored. On the front surface of the main body case 5, various operation buttons 5a and a paper discharge port 5b for discharging recording paper are provided. The thermal printer is for recording a read image obtained by CIS4 on a recording paper by a thermal recording system. The thermal recording method is a method in which the energization time of the heating element of the thermal head is controlled according to a strobe signal from a CPU, which will be described later, and accordingly, as the thermal paper, a coloring layer is formed for each color of red and black. What is done is used. That is, in order to color a specific pixel portion black on each line on the thermal paper, the energization time of the heating element to the pixel portion is set to a predetermined cycle time based on the strobe signal. On the other hand, in order to make another pixel portion other than black in one line red, in order to increase the energization time of the heating element to that pixel portion and increase the heat energy, it is about twice as much as in the case of black. A strobe signal with a long cycle time is applied to the thermal head. Then, in thermal paper,
From the difference in the reaction of the coloring layers formed for each color to heat,
A colored image consisting of two colors, red and black, is formed.
Of course, the thermal printer having such a function can also perform monochrome recording.

FIG. 2 is a block diagram showing the control circuit of the electronic bulletin board A.

The control circuit includes the CPU 10, ROM 11 and R
AM12, EEPROM13, interface 14,
The reading unit 20, the recording unit 21, the operation unit 22, the external connection unit 23, and the like are included in the overall configuration. CPU10,
The ROM 11, the RAM 12, the EEPROM 13, and the interface 14 are mutually connected by a bus line. The bus line includes an address bus, a data bus, and a control signal line. A reading unit 20, a recording unit 21, an operating unit 22, and an external connecting unit 23 are connected to the interface 14.

The CPU 10 controls the operation of the entire electronic bulletin board A. The ROM 11 stores data such as programs executed by the CPU 10 and set values. RAM12
Is mainly used as a line buffer memory for the work area of the CPU 10 and the read image development area. E
The EPROM 13 stores various flags and setting data. The interface 14 includes the CPU 10 and each unit 2
It functions as an input / output contact with 0-23. Reading unit 20
Has a function of reading an image from the writing sheet S by including the CIS 4 and the stepping motor 20a. The recording unit 21 includes the thermal printer, the recording motor, and the like, and has a function of recording an image on recording paper. The operation unit 22 has the above-mentioned operation buttons 5a and is for transmitting the operation signal requested by the user to the CPU 10. The external connection unit 23 is used when connecting an external device such as a personal computer to the electronic bulletin board A.

Explaining the main points, the writing sheet S
When performing copying or the like by a standard use method, it is assumed that the mark moves around every half circle from the position where one mark is detected by the CIS4 until the next mark is detected. Such orbital movement of the writing sheet S is started by the rotation of the drive roller 2 via the stepping motor 20a, and when the writing sheet S moves, it is read by the CIS 4 from the outer peripheral surface of the writing sheet S. The image is recorded on the recording paper on the spot via the thermal printer. Every time one copying operation is completed, the writing sheet S is stopped in the state where the same portion is always in close contact with the driving roller 2 and the driven roller 3, and continues to stand by until the next copying.
In this way, the rollers 2 and 3 can be used for a long time such as during standby.
Part of the writing sheet S that is pulled to
There is a portion that is semipermanently imprinted by being pressed against each of the rollers 2 and 3 for a long time, and such an imprint portion becomes a load when the writing sheet S starts to move, and the writing sheet works well. It is not possible to move S around.
That is, when the trace-shaped portion faces the stopped rollers 2 and 3, even if the drive roller 2 starts to rotate by the driving force in the steady state from that state, the trace-shaped portion cannot pass through the rollers 2 and 3, Problems such as the drive roller 2 idling and the sheet S stagnating occur. Therefore, when the writing sheet S starts to move around, the driving force of the stepping motor 20a is changed to a higher value by the control of the CPU 10.

On the other hand, unlike the standard use method, before the copying is started, the user may move the writing sheet S by a certain amount, and then the copying may be started. In such a case, one mark that should be the reading start position is detected by the CIS 4 during the movement of the writing sheet S, and the trace portion also faces the rollers 2 and 3 during the movement of the writing sheet S. . Therefore, when the copying is started, the trace-shaped portion is not always located at the position facing the rollers 2 and 3, and the trace-shaped portion may face the rollers 2 and 3 during the movement of the writing sheet S. In such a case, there is a possibility that the trace-shaped portion may not pass through the rollers 2 and 3 depending on the driving force of the stepping motor 20a in the steady state. Therefore, in the electronic bulletin board A according to the present embodiment, when a mark is not detected by the CIS 4 at the start of copying when the writing sheet S starts to move around, it is determined that the writing sheet S is displaced from the normal copy start position. , A method of increasing the driving force of the stepping motor 20a under the control of the CPU 10 is adopted.

A bonding tape is attached near the mark position on the writing sheet S, and this bonding tape also tends to hinder the movement of the writing sheet S, like the traced portion. However, as described above, from the beginning of the circular movement of the writing sheet S, the stepping motor 20
When the driving force of a is increased, the joining tape can pass through the rollers 2 and 3 as easily as the trace-shaped portion.

When the driving force of the stepping motor 20a is high, the operation sound accompanying the orbital movement of the writing sheet S is loud and noisy, but the CIS 4 is marked during the movement of the writing sheet S after the movement. When one is detected, the driving force of the stepping motor 20a is reduced to a low level in the steady state by the control of the CPU 10. Specifically, after one of the marks is detected by the CIS 4, the writing sheet S is moved by a length long enough for the trace portion to pass the roller, and the movement of the writing sheet S having such a predetermined length is completed. Therefore, the driving force of the stepping motor 20a is lowered to the steady state level. Therefore, while the writing sheet S is moved from the beginning to the end, the state where the operation sound is large does not continue for a long period of time, but the driving force of the stepping motor 20a is set after the writing sheet S is in a state where it can be smoothly moved. The decrease in the noise reduces the operation noise in the subsequent operation.

That is, the reading section 20 realizes reading means for reading an image from the outer peripheral surface of the sheet. The recording unit 21 realizes a recording unit that sequentially records the images obtained by the reading unit on a recording sheet. The stepping motor 20a realizes a driving unit that rotates a roller as a transport mechanism. The CPU 10 realizes a drive control unit that controls the drive force of the drive unit to be higher than that in a steady state so as to increase the conveyance force of the conveyance mechanism when the sheet starts to move around. Further, the ROM 11 stores a program for controlling an image reading device that reads an image from the outer peripheral surface of the sheet through the reading unit while the endless annular sheet is circlingly moved by a conveyance mechanism provided on the inner peripheral surface thereof. A storage medium that stores a program including a drive control program for controlling the driving force of the driving unit to be higher than that in a steady state so as to increase the conveying force of the conveying mechanism when the sheet starts to move circularly. Realizes a storage medium.

Next, the operation of the electronic bulletin board A having the above configuration will be described with reference to the drawings.

3 to 6 are flowcharts showing various copying processing procedures in the electronic bulletin board A. In the processing procedure shown in each drawing, the processing related to the recording operation is omitted.

First, as shown in FIG. 3, the CPU 10
It is determined whether or not the user has instructed to start copying by pressing a predetermined operation button 5a (S1). When the user presses the operation button 5a, it is normally assumed that one of the marks on the writing sheet S is at a position where the CIS 4 can read, but before the operation button 5a is pressed, the writing sheet S When moved by the user, the mark on the writing sheet S is also displaced from the readable position of the CIS 4. In the present embodiment,
It is assumed that the operation button 5a is used to specify that the image on the writing sheet S is monochrome when the copy start instruction is given, but red is mixed.

When the start of copying is instructed (S1: YE
S), the CPU 10 determines whether or not the mark on the writing sheet S is detected by the CIS 4 (S2).

When the mark cannot be detected (S2: N
O), the CPU 10 determines whether or not the designated one is monochrome copying (S3).

In the case of monochrome copying (S3: YES), C
The PU 10 shifts to a monochrome copying process described later (S
4).

On the other hand, if the copy is not monochrome (S3: N
O), the CPU 10 shifts to red-black copying processing described later (S).
5).

When a mark is detected immediately after the start of copying in S2 (S2: YES), the CPU 10 shifts to a normal copying process described later (S6).

In S1, if the user does not press the operation button 5a to start copying and does not give any instruction (S1: NO), the CPU 10 performs a series of operations related to this copying process until the operation button 5a is pressed. Wait without starting operation.

Next, as shown in FIG. 4, in the normal copying process, the CPU 10 drives the stepping motor 20a by setting the motor current to a high level (100% for both 1 and 2 phases, or 70% for both 1 and 2 phases). By
The writing sheet S is started to move with a higher driving force than in the regular state (S11). That is, it is not a state in which the writing sheet S has been moved by the user before the start of copying, but a normal starting state in which one of the marks on the writing sheet S is at the CIS 4 reading position. Therefore, since the writing sheet S is in a movement start stage in which the movement is likely to cause a trouble, the writing sheet S is conveyed by the driving roller 2 having a high rotational force.

After the writing sheet S has been moved by a predetermined number of steps, the CPU 10 drives the stepping motor 20a by setting the motor current, which had been at a high level up to that point, to a low level (70% for one phase, 33% for two phases). While moving the writing sheet S by the constant driving force,
The reading process is executed by 4 (S12). In this reading process, the image on the writing sheet S is read line by line by the CIS 4 using the binarization level as a reference.

Subsequently, the CPU 10 determines whether or not the writing sheet S for a predetermined line has moved (S13). The predetermined line means that the roller 2, which has a joining tape portion,
It is set in advance so as to reach the amount of movement before passing through the roller 3, and when the joining tape portion passes through the rollers 2 and 3, the reading processing is performed at a medium level of the motor current.

When the writing sheet S for a predetermined number of lines has moved (S13: YES), the CPU 10 sets the motor current, which had been at a low level until then, to a medium level (1 phase 70%, 2 phase 7).
By driving the stepping motor 20a at 0%), the reading force is executed by the CIS 4 while moving the writing sheet S with a higher driving force than in the steady state (S14).

After that, the CPU 10 determines whether or not the next mark on the writing sheet S is detected by the CIS 4 (S15), and when the next mark is detected (S1).
5: YES), the CPU 10 determines that the writing sheet S has been moved to the end and stops the operation of the stepping motor 20a, thereby stopping the writing sheet S and ending this normal copying process.

When the next mark cannot be detected in S15 (S15: NO), the CPU 10 returns to S14 and keeps the rotational force of the drive roller 2 high.

When the writing sheet S for the predetermined line is not moved in S13 (S13: NO), the CPU 10
Returns to S12 and keeps the rotational force of the drive roller 2 in the steady state.

Next, as shown in FIG. 5, in the monochrome copying process, the CPU 10 sets the motor current to a high level (1,
(100% for both phases, or 70% for both phases 1 and 2)
As a result, the stepping motor 20a is driven to increase the driving force as compared with the steady state, and the writing sheet S is moved by a predetermined step (S21). That is, in this case, the writing sheet S is moved by the user before the monochrome copying is started, and one of the marks on the writing sheet S is not at the CIS 4 reading position. However, even in this case, the writing sheet S is the writing sheet S.
Is moved by a predetermined number of steps and the reading process is started, the sheet is conveyed by the driving roller 2 whose rotational force is increased.

The CPU 10, which has moved the writing sheet S by a predetermined number of steps, drives the stepping motor 20a at a medium level (70% for one phase and 70% for two phases) of the motor current, which has been at a high level until then. While moving the writing sheet S with a higher driving force than C,
The reading process is executed by IS4 (S22). Also in this reading process, the image on the writing sheet S is read line by line by the CIS 4 using the binarization level as a reference.

While the reading process is performed in this manner, the CPU 1
For 0, it is determined whether or not the writing sheet S has gone around for one page (corresponding to a half turn of the sheet) by counting the number of steps (S23).

When the writing sheet S is rotated by one page (S23: YES), the CPU 10 drives the stepping motor 20a while keeping the motor current at a middle level, and moves the writing sheet S as it is (S).
24). This is because the joining tape portion comes to a position facing any of the rollers 2 and 3 until the next mark is detected, so that the conveying force is increased to some extent and the joining tape portion is easily overwhelmed. In the case where the writing sheet S is temporarily stopped after the page has been divided by one page, the motor current is set to a high level (100% for both phases 1 and 2) and the motor current is moved to the intermediate level for a predetermined number of steps. As a result, the writing sheet S is moved around until the next mark is detected.

After that, the CPU 10 judges whether or not the next mark on the writing sheet S is detected by the CIS 4 (S25), and when the next mark is detected (S2).
5: YES), the CPU 10 determines that the writing sheet S has been moved to the end and stops the operation of the stepping motor 20a, thereby stopping the writing sheet S and ending the monochrome copying process.

When the next mark cannot be detected in S25 (S25: NO), the CPU 10 returns to S24 and keeps the rotational force of the drive roller 2 high.

In S23, if the writing sheet S is not rotated by one page (S23: NO), the CPU 10
Returns to S22 and continues the reading process.

Next, as shown in FIG. 6, in the red-black copying process, the CPU 10 drives the stepping motor 20a by setting the motor current to a high level (100% for both 1 and 2 phases, or 70% for both 1 and 2 phases). By
The writing sheet S is moved by a predetermined number of steps with a higher driving force than in the normal state (S31). That is, also in this case, as in the case of monochrome, the writing sheet S is conveyed by the drive roller 2 whose rotational force is increased until the writing sheet S moves by a predetermined step and the red / black reading process is started. It

The CPU 10, which has moved the writing sheet S by a predetermined number of steps, drives the stepping motor 20a at a low level (70% for one phase, 33% for two phases) while keeping the motor current at a high level until then. While the writing sheet S is moved by the driving force of, the reading process of red and black is executed by the CIS 4 (S32). In this reading process, the image expressed in red and black on the writing sheet S is read separately for red and black via the CIS 4. At this time, it takes time to read each of red and black, and the motor operating noise becomes loud for a long time. Therefore, the reading is performed under the low level driving without basically performing the middle level driving. It is assumed that the drive is of a low level except that the trace-shaped portion described later faces the joining tape portion.

While the reading process is performed in this manner, the CPU 1
0 again determines whether or not a mark on the writing sheet S is detected by the CIS 4 (S33).

When a mark is detected (S33: YE
S), the CPU 10 drives the stepping motor 20a with the motor current, which has been at a low level until then, at an intermediate level (70% for one phase and 70% for two phases), thereby increasing the driving force as compared with the steady state and writing sheet S. The scanning process is continued while moving (S34).

While continuing the reading process, the CPU 10
Determines whether or not the writing sheet S has been rotated a predetermined number of lines after the mark is detected (S35). The predetermined line mentioned here is set as a length that allows one of the rollers 2 and 3 to pass through the trace portion.

Writing line S for a predetermined line from mark detection
Circulates (S35: YES), the CPU 10 sets the motor current to the low level again to set the stepping motor 20a.
Is driven to move the writing sheet S by the driving force in the steady state, and the reading process of red and black is continued (S3
6).

While the reading process is performed in this manner, the CPU 1
In the case of 0, it is determined whether or not the writing sheet S has been divided by one page by counting the number of steps from the start of the reading process (S37).

When the writing sheet S is rotated by one page (S37: YES), the CPU 10 sets the motor current to the middle level and drives the stepping motor 20a,
The writing sheet S is moved around as it is (S38). This S38 is also performed for the same reason as S24.

After that, the CPU 10 determines whether or not the next mark on the writing sheet S is detected by the CIS 4 (S39), and when the next mark is detected (S3).
9: YES), the CPU 10 determines that the writing sheet S has been moved to the end and stops the operation of the stepping motor 20a, thereby stopping the writing sheet S and ending this red-black copying process.

If the next mark cannot be detected in S39 (S39: NO), the CPU 10 returns to S38 and keeps the rotational force of the drive roller 2 high.

In S37, if the writing sheet S is not rotated by one page (S37: NO), the CPU 10
Returns to S36 to continue the reading process.

In S35, when the writing sheet S has not circulated for a predetermined line after the mark detection (S35: N
O), the CPU 10 returns to S34 and keeps the rotational force of the drive roller 2 high.

When no mark is detected in S33 (S33: NO), the CPU 10 returns to S32 and keeps the rotational force of the drive roller 2 in the steady state.

Therefore, according to the electronic bulletin board A which performs the above series of processing, the roller 2,
A writing sheet S having a semi-permanent trace-shaped portion or a joining tape portion by being in close contact with 3 is used, and even when the trace-shaped portion or the joining tape portion comes to a position facing the rollers 2 and 3 during movement, In this case, since the driving roller 2 having an increased rotational force is moved around, the trace of the writing sheet S or the joining tape portion does not cause any trouble when the rollers 2 and 3 are overrun, and the writing sheet S does not have any trouble. You can move around smoothly and smoothly.

The present invention is not limited to the above embodiment.

For example, the present invention can be applied not only to the motor control for moving the writing sheet S during the copying process but also to the motor control for simply feeding the writing sheet S. In this case, even if a mark is detected during the movement of the writing sheet S, the rotational force of the driving roller 2 is increased without increasing the rotational force of the driving roller 2 and the rotational speed of the driving roller 2 is set to the stepping motor 20a. It may be changed a little higher depending on the number of steps.

At the start of the movement of the writing sheet S, the rotational force of the driving roller 2 is set to a steady level, and immediately after the mark is detected during the movement of the writing sheet S, the CPU 10 is controlled to increase the rotational force of the roller 2. May be.

The drive means for rotating the drive roller 2 is not limited to the stepping motor 20a, but may be an AC motor or a DC motor.

A contact type image scanner or the like is preferably used as the reading means, but the reading means is not limited to the contact type and a linear CCD (Charge Coupled Device) employing a reduction optical system is used.
: Charge coupled device), or a CCD whose light-receiving surface is composed of a plurality of pixels vertically and horizontally.

As a reading method, a method of switching light sources of different emission colors was used. However, a method of switching emission colors with a color filter using one light source, or a method of receiving light of different wavelength colors by a spectral prism corresponding to each color It may be a method of leading to a device. Furthermore, color C that can be directly separated
A method of reading a color image using a CD or the like may be used. Of course, it may be one that can read only monochrome images.

The writing sheet S is not limited to a white background and is not limited to one that can be written with a felt-tip pen.
What is necessary is that the image can be identified by IS4.

The recording means may be, for example, an ink jet type printer or a laser type printer in addition to a thermal printer.

The device to which the present invention is applied is not limited to the electronic bulletin board A, but can be applied to, for example, an image reading device for reading handwritten characters or the like having only a reading function by moving a writing sheet.

The operation to be performed by the control circuit may be an operation controlled by a personal computer or the like.

Other than the above-mentioned features of the present invention, the design can be appropriately changed as long as the effects of the present invention are not impaired.

[0093]

As described above, according to the image reading apparatus of the first aspect of the present invention, the trace of the transport mechanism
When starting the movement of the sheet from the state where the shape parts face each other
In addition, the seat can be smoothly started to move.

[0094]

Further, according to the image reading apparatus of the invention described in claim 2 , in addition to the effect of the image reading apparatus described in claim 1 , usually, the vicinity of the mark of the sheet is set as the reading start position and the sheet is orbited. the movement is started, it becomes possible to trace is formed by the transfer mechanism in the vicinity of the mark, when starting to circularly moves after the user moves the sheet so as to shift by hand, the trace portion circular movement In the middle of, it comes to a position facing the transport mechanism. Therefore, when the mark is not detected by the reading means when the orbiting movement starts, it is determined that the trace portion comes to a position facing the transport mechanism during the orbiting movement. By controlling the driving force of the driving means to a medium level or higher until the end, it is possible to smoothly move the sheet in the circular movement without causing any trouble even when the trace portion of the sheet passes through the transport mechanism. it can. In other words, the conveyance force of the conveyance mechanism is at a medium level from the start of the circular movement of the sheet to the stop
Since it is kept, even if a trace portion which section the way of movement, can be circular movement of the sheet to the degree may last.

Further, according to the image reading apparatus of the invention described in claim 3 , the sheet is conveyed when starting to move circularly.
The driving force of the driving means so that the conveyance force by the mechanism is high
To high level and then to low level at the start of image reading
By doing so, you can prevent the operation noise from continuing to be loud.
be able to. Also, while reading the image, touch one of the marks
When it detects it, the driving force of the driving means is switched to a medium level <br /> The sheet is moved to a certain extent by the length that the trace portion spends over the roller , and then returned to the low level again, so that the trace portion faces the roller. The rotation force of the roller can be increased before and after the detection of a mark that increases the load.
After the trace-shaped portion passes through the roller, the operation noise accompanying the orbital movement of the sheet can be reduced to the steady state.

[0097]

[0098]

[0099] Further, according to the image reading apparatus of the invention described in claim 4 and 5, also joining tape like the mark shaped portion prevents the movement of the seat is not affixed to the sheet, such adhesive tape It is possible to move the seat around smoothly without causing any trouble when spending.

[0100]

Further, according to the image reading device of the invention described in claim 6 , in addition to the effect of the image reading device according to any one of claims 1 to 5 , the image is read through the reading means. It is possible to realize a copying function of recording an image on the spot by the recording means.

[0102]

[0103]

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an appearance of an electronic bulletin board having a copying function as an embodiment of an image reading apparatus according to the present invention.

FIG. 2 is a block diagram showing a control circuit of an electronic bulletin board.

FIG. 3 is a flowchart showing a copy processing procedure on an electronic bulletin board.

FIG. 4 is a flowchart showing a normal copy processing procedure on an electronic bulletin board.

FIG. 5 is a flowchart showing a monochrome copying processing procedure on the electronic bulletin board.

FIG. 6 is a flowchart showing a red-black copying processing procedure on the electronic bulletin board.

[Explanation of symbols]

1 Bulletin board case 2 drive roller 3 Driven roller 4 CIS (contact image scanner) 5 body case 10 CPU 11 ROM 12 RAM 13 EEPROM 14 Interface 20 Reader 20a stepping motor 21 Recording section 22 Operation part A electronic bulletin board S Writing sheet

Claims (6)

(57) [Claims] 1. A pair of rollers arranged in parallel, and the pair of rollers.
They are stretched between these rollers, and there are two
Endless annular sheet with a mark and one of the above roller pairs
At the position facing the driving means and one roller
Read the image placed on the outer surface of the above sheet
And a reading means for reading, and the sheet is
The outer peripheral surface of the seat while moving the
Image reading in which the image drawn on the
In the device, the driving means is of three types of low level, medium level and high level.
The driving force of each class can be switched, and when the sheet starts to move circularly, the reading means causes the marker to move.
When one of the two
Driven by the driving force to move the above sheet by a predetermined amount.
Then, the above-mentioned sheet is moved for a predetermined line with a low level driving force.
And move it around, and then use the reading means to
The above seat with a medium level driving force until one is detected.
The drive control means for rotating and the tie for switching the drive force of the drive means to a low level.
Image reading of the sheet by the reading means
Timing when the other side of the above marks is detected
In the image reading apparatus characterized by comprising a, a reading control means for stopping the reading of the image. 2. The drive control means is the orbit of the sheet.
At the start of movement, one of the marks is detected by the reading means.
If not, drive the above driving means with a high level of driving force.
After moving the above-mentioned seat by a predetermined amount,
Until the mark is detected twice with the driving force of
And the reading control means moves upward when starting the circular movement of the sheet.
If one of the above marks is not detected by the reading means,
The timing of the driving force of the driving means can be switched to a middle level.
Reading the image on the sheet by the reading means.
When the seat is started, the seat is moved around a half turn.
The reading of the image is stopped at
The image reading apparatus according to claim 1 . 3. The image reading device according to claim 2.
There are, the reading means reads the plurality of colors from the outer peripheral surface of the sheet
Taken is possible to made, the drive control means reads the image of the sheet with a plurality of colors
When taking, drive the above driving means with a high level driving force.
After moving the above seats by a predetermined amount,
Switch to driving force and the first mark is detected on the above sheet.
Drive around until it reaches
In exchange, the above sheet was moved around a predetermined line.
After that, switch to a low level driving force again,
When the motor is moved a half turn, it switches to a medium level driving force.
And move the sheet around until the second mark is detected.
And the reading control means reads the sheet image in a plurality of colors.
When taking, the driving force of the above-mentioned driving means is first switched to the low level.
At the timing of replacement, the reading means causes the sheet
Start reading the image of the
The reading of the image is stopped at the timing of moving
An image reading device characterized in that 4. The sheet is connected to form an endless ring.
Adhesive tape is attached and one of the above marks
Is provided in the vicinity of the position where the joining tape is attached, and the high level driving force is applied at the start of the circular movement of the sheet.
The predetermined amount by which the seat is orbitally moved is at least the above
The attachment position of the joining tape of the paper passes through the roller
The image reading device according to claim 1 , wherein the image reading device is a movement amount . 5. The sheet is connected to form an endless ring.
Adhesive tape is attached and one of the above marks
Is provided in the vicinity of the position where the joining tape is attached, and the high level driving force is applied at the start of the circular movement of the sheet.
Predetermined amount of sheet orbital movement and driving force of the driving means
Is switched to the middle level, and the above seats are moved around.
The amount of movement for a predetermined line is at least the above-mentioned sheet
The joining position of the joining tape of the
The image reading device according to claim 3 , wherein the image reading device is a moving amount . 6. The images obtained by the reading means are sequentially processed.
A recording means for recording on a next recording sheet is provided.
The image reading device according to claim 5 .