JPH04162866A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To always accurately read an original and to attain facsimile transmission by providing a means calculating a prescribed width and length of an original required for the facsimile transmission based on a position signal of the original to the facsimile equipment. CONSTITUTION:When the operator sets a transmission original to an original platen 101 of an original carrier 100, uses an operation display section 19 to select the facsimile mode, enters a destination and depresses a start key to start the transmission, then a system control section 23 transfers a data entered by the operator to a facsimile control section 24 to start facsimile transmission and gives a command of carrying a transmission original to a DF control section 20. Thus, the transmission original is positioned onto a contact glass 202 by the original carrier 100 and the size is discriminated and the result is informed to the facsimile control section 24 via the system control section 23. Thus, the original width and length are calculated from the coordinate of the original in this way to always read the original accurately thereby implementing the facsimile transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile machine equipped with a document reading device having a function of detecting the position of a document on a contact glass.

[Conventional technology]

Generally, in order to read the size of a document placed on a contact glass, the edge of the document is detected by a sensor placed at a predetermined position.

[Problem to be solved by the invention]

However, in the conventional device described above, document size detection is performed using a small number of sensors, so although standard sizes can be detected, special sizes such as royal sizes and foreign paper cannot be detected properly, and Automatic paper selection mode, etc., which automatically selects the paper according to the paper, did not function properly.

In this case, the output is visible when copying, so
If an abnormal copy occurs, you can simply copy it again, but when sending a facsimile, there is no record on the sender's side, so the image is often sent with the image cut off, resulting in complaints.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus that can eliminate the drawbacks of the prior art described above and can accurately detect the size of a document regardless of its type.

[Means to solve the problem]

The above object is to provide means for calculating a predetermined width and length of a document required for facsimile transmission from a position signal of the document in a facsimile machine equipped with a document reading device having a function of detecting the position of a document on a contact glass. First prepared
This is accomplished by the following means.

In addition to the first means, the above object is achieved by a second means that includes means for correcting and reading the amount of deviation of a document set at a position deviated from a reference position based on position data of the document.

[Effect]

According to the first means, a predetermined document width and length required for facsimile transmission are calculated from the document position signal.

Further, according to the second means, based on the position data of the document,
The amount of deviation of a document set out of position from the reference position is corrected and read.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a facsimile machine according to an embodiment of the present invention.

This facsimile machine includes a document transport device 100 which transports the document to a contact glass (described later), a scanner 200 which decomposes an image of the document positioned on the contact glass at a predetermined resolution and photoelectrically converts the image, and the scanner 200
It is composed of a copying device 300 that records the image read by the printer on recording paper of any size stored in three paper feed cassettes and is equipped with a double-sided copying function.
Basically, it has the same configuration as a well-known so-called digital copying machine. In the document transport device 100, the document table 101
One by one, the originals placed on the feed roller 102
and is positioned at a predetermined position on the contact glass 201 by the conveyor belt 103. After the image of the original is read, the original is removed from the contact glass 201 by the conveyor belt 103 and ejected onto the ejection tray 104. In the scanner 200, an image of a document positioned on a contact glass 201 is scanned in the direction of the arrow by an optical system 202, and the image obtained by scanning (hereinafter referred to as scan light) is imaged on a line image sensor 203. has been done. The line image sensor 203 decomposes the scan light of the scan line of the optical system 202 into a predetermined number of pixels and photoelectrically converts the image of each pixel, thereby forming electrical image information. Furthermore, this scanner 200
The resolution is set to 15.4 dots/mm in the main scanning direction and 15.4 lines/mm (400 dots/inch) in the sub-scanning direction. This resolution is the standard resolution of facsimile machines (8 dots in the main scanning direction) / m
m and the sub-scanning direction is 3.85 lines/mm), it is about twice as high in the main scanning direction and about 4 times as high in the sub-scanning direction, and has a high resolution (8 dots/mm in the main scanning direction). 7.7 lines/mm in the scanning direction), it is approximately twice as large in both the main scanning direction and the sub-scanning direction. In the copying apparatus 300, a drum-shaped photoreceptor 302 is irradiated with laser light output from a laser writing section 301 that scans laser light modulated according to image information. Note that the recording resolution of the copying apparatus 300 is set to the same resolution as that of the scanner 200. The photoreceptor 302 is rotated in the direction of the arrow, and its surface is uniformly charged by the charger 303, and the charged surface is exposed to laser light to create an electrostatic latent corresponding to the recorded image (image information @). An image is formed, and this electrostatic latent image is developed with toner by developer 304. , 7 sides, 3 paper feed cassettes 305,3
The recording paper stacked in the selected one of 06.307 is stored in paper feed cassettes 305, 306, and 307, respectively.
The paper feed rollers 308, 309, 310 corresponding to the paper feed rollers 308, 309, 310 feed out the paper sheets one by one starting from the one located at the top. The recording paper fed out by the paper feed rollers 308, 309 and 310 in this manner is transferred to the photoreceptor 3 by the registration roller 311 at the timing when its leading edge coincides with the leading edge of the toner image.
Sent out on 02. The recording paper sent out to the photoreceptor 302 is brought into close contact with the photoreceptor 302 by a transfer charger 312 and a toner image is transferred thereto, and then separated from the photoreceptor 302 by a separation charger 313, and then the toner image is transferred to the photoreceptor 302 by a fixing device 314. fixed on the surface. Then, the recording paper that has been fixed is conveyed by a discharge roller 317 via a distribution section 315 and a reversing section 316, and is discharged outside the machine. The recording paper discharged outside the machine is sorted by sorting 318.
A stacker 319 that stacks recording paper on which a copy image is recorded during a copying operation. Alternatively, they are sorted into a stacker 320 that stacks recording sheets on which received images are recorded during facsimile reception. The distribution section 315 transfers the recording paper on which the image has been recorded to a reversing section 316 and an ejection roller 317 . Alternatively, it is sorted to either the transport section 321, and the transport section 32
1 is for transporting the recording paper on which the image on the first side is recorded to the registration roller 311 again during double-sided copying. The residual toner on the surface of the photoreceptor 302 is removed by the cleaning section 322, and the residual charge is removed by the static elimination lamp 3.
removed by 23.

An example of the distribution section 315 is shown in FIG.

In the same figure, 315 a, 315 b, 31
5 c.

315d is a conveyance roller 315e that conveys the recording paper.

315f is a branch plate for switching the conveyance path of the recording paper. When ejecting the recording paper inverted, that is, with the side on which the image is recorded facing down, the branch plate 3
15e is biased in the A1 direction, and the branch plate 315f is biased in the A3 direction. Then, the recording paper passes sequentially through the conveyance paths A99B, H2, and E, is conveyed to the discharge roller 317, and is discharged outside the machine.

When the recording paper is discharged as it is, that is, with the image recording surface facing up, the branching plate 315e is biased in the A2 direction. The recording paper then passes through the conveyance path "to", is conveyed to the discharge roller 317, and is discharged outside the machine. When sending the recording paper to the transport section 321, the branch plate 315
13 is biased in the AI direction, and the branch plate 315f is biased in the A4 direction. Then, the recording paper sequentially passes through the conveyance paths A, B, C, II, G, and H, and is sent out to the conveyance section 321.

FIG. 1 shows an example of a control system of this facsimile machine. In the same figure, an output image signal from a line image sensor 203 is amplified to a predetermined amplitude by an AGC (variable gain side? I) amplifier 11, and converted into a digital signal with a predetermined number of bits by an analog/digital converter 12. It is added to the processing section 13. The image processing unit 13 performs a sieniding correction process to correct variations in the level of image signals caused by variations in the characteristics of the optical system 202 of the scanner 200 and the light receiving characteristics of each bit of the line image sensor 203, By correcting the difference between reading characteristics and human visual characteristics, scanner 2
T-correction processing that converts a 00 scanned image into a visually optimal image, MTF correction processing that eliminates image blur, and appropriate correction of images of originals with dark or dirty backgrounds such as newspapers. Background removal processing for extraction, halftone processing for pseudo-grading the image, character/halftone separation processing for separating the character part to be binarized and the image to be halftone processed, and It realizes various other image processing. The image information processed by the image processing unit 13 is
The image processing unit 14 compresses the image using the most efficient method, and image data corresponding to the compressed image information is stored in the image memory 15. This image memory 15 is
It has a storage capacity capable of storing image information of several tens of compressed standard originals (for example, about 20 to 60 images), and its writing and reading operations are controlled by the memory control unit 16. The image data read from the image memory 15 is restored to the original image signal by the image processing section 14, and the restored image signal is applied to the laser diode driver 17, whereby the image is output from the laser diode 18. Laser light modulated by a signal (image information) is generated. Note that this laser diode 1
8 is provided in the laser writing section 301 of the copying apparatus 300. The image processing unit 4 also executes density conversion processing for converting the linear density of an image and scaling processing for reducing or enlarging the image. The operation display section 19 includes operation keys necessary for operating this apparatus as a copying machine or a facsimile machine, and a display for displaying the operating status and operating procedures of the facsimile apparatus. For example, operation keys include:
The start key is used to start facsimile transmission, the copy key is used to start copying, the stop key is used to stop copying, the numeric keypad is used to enter numerical data such as the number of copies, telephone number, etc. It includes abbreviated keys for input, mode keys for setting various operation modes of the facsimile machine, and guidance keys for selecting selection items displayed on the display. In addition, as a display device, we use a liquid crystal display device, etc., which has a high degree of freedom in display, to display message information about operating procedures, etc.
Displays the numerical value entered using the numeric keypad and the actual number of copies. DF! l] l[1st copy 20 is the document conveying device 100
The scanner control section 21 controls the scanner 200, and the copy control section 22 controls the operation of each part of the copying apparatus 200. These DF control units 20. Scanner control unit 21. Copy control section 222 Image processing section 13. Memory control section 15. and laser diode driver 1
7, each operation timing, operation mode, etc. are controlled by the system control unit 23.

The memory control section 15 and the copy control section 22 exchange information for synchronizing the operation of the laser writing section 301. The facsimile control section 24 executes a transmission control procedure for facsimile transmission, and the image compression/expansion section 26 . Modem 27. and controls the network control device 28 to transmit and receive image information. This facsimile control section 24
exchanges control information and the like with the system control unit 23 and memory control unit 16. The image compression/expansion unit 26 compresses the image to be transmitted using a code compression method used in facsimile transmission, and also expands the received image into the original image signal, and is capable of performing compression/expansion processing using a plurality of code compression methods. . The modem 27 modulates digital data into a waveform that can be transmitted via an analog line and demodulates the received signal into the original digital data, and can perform modulation and demodulation processing using a plurality of modulation methods. For example, Gl, G2. It is composed of units for respectively realizing modulation and demodulation processing of each G3 facsimile mode. The network control device 28 is for connecting this facsimile device to a transmission line (in this case, a public telephone line network), and has an automatic call originating and receiving function. 29 is a character generator. The input data from the operation display section 19 is notified to the facsimile control section 24 via the system control section 23.
Display data from to the operation display section 19 is output to the operation display section 19 via the system control section 23, and control information from the facsimile control section 24 to the image processing section 13.14 is also output via the system control section 23. Output.

Next, facsimile transmission operation will be explained.

In the facsimile transmission procedure, for example, as shown in Figure 4, when the sending side calls the receiving side (calling signal CNG) and the line is established, the receiving side indicates that it is a non-voice terminal. After responding with the called station identification signal CED, the called station responds with a digital identification signal DIS indicating the receiving function of its own station.

From the contents of the received digital identification signal DIS, the transmitting side
Select the function to be used for the facsimile transmission, display it in the digital command signal DO3 to notify the receiving side, set the modem speed to the transmission speed selected at that time, 1.
Execute 5 seconds of training (Training Check TCP). If the result of this modem training is good, the receiving side responds to the transmitting side with a reception preparation confirmation signal CFR, and prepares to receive images at the current modem speed.

Upon receiving the reception preparation confirmation signal CFR, the transmitting side sends out a training signal TNG corresponding to the modem standard training sequence corresponding to the set modem speed, then transmits the image information MSG of the first page, and then transmits the subsequent image information MSG. If there is an image, a multi-page signal MPS is transmitted. If the receiving side can properly receive the received image at that time, it responds with a message confirmation signal MCF and prepares to receive the next page of images. The transmitting side that has received the message nt12 signal MCF transmits the training signal TNG again, then transmits the image information of the second page, and then transmits the procedure end signal EOP to end the transmission. On the receiving side, the message confirmation signal MCF is sent in the same way as for the first page.
The sender responds with this message confirmation signal MCF.
When it receives this, it transmits a disconnection command signal DCN, disconnects the line, and ends the facsimile transmission. This disconnection command signal D
The receiving side that receives the CN disconnects the line. A series of such facsimile transmission procedures is executed to transmit the image. At this time, a high speed modem of 2400 to 9600 bps is used to transmit the training check TCP and image information, and a low speed modem of 300 bps is used to transmit other transmission control procedure signals such as the digital identification signal DIS. Note that the transmission control procedure signal shown here is a part of the transmission control procedure signal defined in the facsimile transmission procedure. This facsimile transmission procedure is
CCrTT (International Telegraph and Telephone Consultative Committee) Recommendation T, 30
Standards have been established by.

The transmission control procedure signal basically has a frame structure of a high-level data link control (HDLC) procedure as shown in FIG. 5, and includes two 8-bit flag sequences F.
, 8-bit address part A, 8-bit control part C,
It consists of an 8-bit facsimile control section FC, an n-bit facsimile information section Fl, a 16-bit flag check sequence FCS, and an 8-bit flag F. The flag F consists of a bit string ro 1111110J, the address part A consists of a bit string rlllllljlJ of a global address representing an unspecified party, and the control part C consists of a bit string "11゜0XOOOJ" representing an unnumbered frame.
(X is “O” for non-final frame, “1” for final frame
The facsimile control unit FC consists of a bit string representing each transmission control procedure signal, and the facsimile information unit FI generates a transmission control procedure signal with parameters (Dis.

The flag check sequence FC3 consists of bit strings indicating parameters of DCS, DTC, NSS, NSF, etc.
is the CR obtained by applying a predetermined generating polynomial to the bit string from the address part A to the facsimile information part FI.
It consists of a bit string of C (Cyclic Redundancy Check) code.

An operator places a transmitted document on the document table 1 of the document transport device 100.
01, select the facsimile mode on the operation display section 19, input the destination, and turn on the start key to start the transmission operation.The system control section 23 transfers the data input by the operator to the facsimile control section. 24 to start the facsimile transmission operation, and
A command is given to the PIII control unit 20 to convey the transmission document. As a result, the original to be transmitted is positioned on the contact glass 202 by the original transport device 100, and its size is determined, and the DF control unit 20 sends the result to the facsimile control unit 24 via the system control unit 23.
will be notified. Assuming that the operator selects the immediate transmission mode and selects one destination, the facsimile control unit 24 transfers the destination's telephone number to the network control device 28 to make a call to the destination, and the line is established as described above. The transmission control procedure is executed to determine the receiving function of the destination, and the one to be used is selected and notified to the destination. At this time, the destination's receivable size and the transmission document size are compared, and if they are different, the image of the transmission document is scaled to the destination's receivable size and transmitted.

Note that in normal facsimile machines, it is rare to use recording paper in sizes other than A4 to A3, but facsimile machines like the device in this embodiment that can use many types of recording paper In between, the recording paper may be selected depending on the recording paper actually set, and in that case, a wide range of magnification ratios may be applied. Naturally, in that case, in the pre-transmission procedure, the device notifies itself of its own capabilities by means of a non-standard device signal, etc., and informs the other party of all available recording papers.

By the way, when reducing the image of the transmitted document, if the reduction ratio is large, the reduced image becomes difficult to see, and the image quality at the destination may deteriorate significantly. Therefore, the facsimile control unit 24 stabilizes the image quality by setting the reading linear density according to the magnification.

Next, document size detection will be explained.

FIG. 6 shows a document reading device to which the present invention is applied.

In the figure, a contact glass 401 on which an original to be read is placed is illuminated by light sources 402a and 402b, and reflected light from the image surface of the original to be read is reflected from mirrors 403 and 402b.
04, 405, 406, 407 and a lens 408, an image is formed on the light receiving surface of a line image sensor 409.

Further, the light source 402 and the mirror 403 are mounted on a traveling body 410 that moves on the lower surface of the contact glass 401 in parallel with the contact glass 401 in the sub-scanning direction.
04 and 405 are mounted on a traveling body 411 that moves in the sub-scanning direction at 1/2 speed in conjunction with the traveling body 410, and by moving the optical system, the image surface of the read document is moved in the sub-scanning direction. is scanned.

Further, the image reading resolution in this embodiment is set to 16 pixels/fi, making it possible to read up to A3 size originals. Therefore, the short side 2 of A3 size (297m x 420M)
In order to read 97fi in the main scanning direction, a 5000 pixel CCD line image sensor is used as the line image sensor 409.

In the conventional normal reading device, the traveling body 410.4
The image data is read in the forward movement of step 11, and the image data is returned to the original position (home position) in the backward movement, which constitutes one reading operation.

In the reading operation according to the present invention, (11) the document size is detected in the first forward movement, and after returning to the home position in the backward movement, the normal reading operation is performed in the subsequent reciprocating movements.

(2) The document size is detected in the forward motion, and the reading operation is performed in the backward motion.

There are two possible actions.

In Tl), document size detection is added as a pre-scan before the normal operation, and it takes time to detect the size. On the other hand, in case (2), the size detection and reading operation are performed in one reciprocating motion, which is apparently the same as a normal operation, so there is an advantage in terms of time.

However, normally, the home position of the traveling bodies 410, 411 is on the side of the reference position where the document is placed on the contact glass 401, and when the size is detected in the forward movement from there and the image is read in the backward movement, the reading start position is the size This makes control when outputting image data to a printer or the like a little complicated.

Therefore, there is a method in which the home position of the traveling body is previously set on the opposite side of the document reference edge.

Next, the flow of image data during image reading will be explained.

FIG. 7 shows an example.

In the figure, a line image sensor 409 is driven by a sensor driver 412, and an output signal of the line image sensor 409 is amplified by an amplifier 413.
The /D converter 414 converts the signal into a 6-bit (64 gradation) digital signal.

Thereafter, in a normal reading operation, a shading correction unit 415 performs shading correction to correct uneven illuminance of the light source, sensitivity variations in the elements of the line image sensor 409, etc., and an MTF correction unit 416 corrects blur caused by the optical system.

In this embodiment, the zooming method uses electrical signal processing in the main scanning direction (main scanning scaling unit 417), and in the sub-scanning direction, the reading timing of the image sensor 409 is left unchanged, and the moving body 410 is , 411 by changing the moving speed.

Regarding the main scanning direction, there is also a method of changing the reduction ratio of the lens (in the case of changing the magnification of the optical system, the magnification is changed at the entrance of the image sensor). The scaled data is binarized by a binarization processing unit 418 using a predetermined threshold,
The output circuit 419 outputs the signal to the printer section.

The threshold value of the binarization processing unit 418 may be changed depending on the image density, and processing for converting into pseudo halftones may also be performed. Size detection uses A/D converted data (420 is a size detection circuit).

Next, the size detection method of the present invention will be explained.

Normally, the document 421 is placed on the contact glass 401 with a corner as a reference as shown in FIG. 8(a), or with the center of one side as a reference as shown in FIG. 8(b).

In any case, since one side (left end) is always fixed, the size can be recognized by knowing the position and length of the hatched portion 421a in the figure.

FIG. 9 shows the principle of detecting the shaded portion 421a.

Normally, in the reading operation, two fluorescent lamps or lamps 402a and 402b are used to increase illumination efficiency and eliminate unevenness on the document surface and shadows at the edges. A plate is provided, but this can be used in reverse to detect diagonal areas.

That is, in FIG. 9, the fluorescent lamp 40 illuminates the edge of the document from the right side.
By turning on only the fluorescent lamp 2b and turning off the left fluorescent lamp 402a, the amount of light entering the image sensor 409 is increased only at the end by utilizing diffused reflection at the end as shown in the figure.

However, normally, the output of the image sensor 409 is set to be saturated with the amount of light incident on the whiteness of the pressure plate 422 or the whiteness of a blank sheet of paper, and the whiteness of this white sheet and the output of a sensor that does not receive light are set to be saturated. Since the range is divided into 64 gradations as a black reference, even if the light intensity increases at the edge, it cannot be detected as it is.

It is necessary to reduce the amount of illumination itself by turning off one fluorescent light or eliminating a reflector, and to further modify the black and white range.

In other words, when performing size detection, it is not necessary to use the range used when reading normal images, and image information may be deleted. Therefore, the level of the black reference is raised so that the difference in light amount can be taken only in the portions close to white, and the above-mentioned increase in light amount at the edge of the document is detected.

The method for operating this range is shown below.

In FIG. 9, the image data formed on the CCD is C
Inside the 0D (7), it is separated into an ODD output (O3I) and an EVEN output (O32), and output in a staggered manner. In addition, in this example, the noise of the reset clock is compensated for by the output (DSI,
It has a DS2) terminal and outputs a CCD.

Differential amplification of O3I and DSL is performed by ○P amplifier A1, the noise component of the reset clock is canceled, and only the signal component is extracted.

Similarly, for ○S2, only the signal is extracted by differential amplification (2) (the internal circuit is the same as differential amplification (1)).

The signal output in this way is the ODD side output output 3I.
) and the EVEN side output (032) are output in a staggered manner, so these outputs are gated (1).

(2) Synthesis is performed by turning on/off SWI, 2 according to the signal.

Next, the OP amplifier A2 performs amplification and impedance conversion, and inputs the resultant signal to vIN of the A/D. This A2
is SW3. It is possible to change the gain with SW4, and by determining the gain (1), (21 signal) in response to changes in the light intensity of fluorescent lamps due to temperature and aging,
This is to prevent the voltage of VIN from changing significantly when the reference white board is read.

Further, the reference voltages Vref+ and Vref- of the A/D are respectively applied to the OP amplifier A3. It is made from A4. +
The reference voltage on the side is fixed to a voltage determined by the Zener diode ZD. However, the reference voltage V r on one side
The voltage of ef- is changed by turning SW5 on/off.

When the enlarged signal is HighO, SW5 is turned on, so V
ref- becomes Ov, but when the size detection signal is Lo-, SW5 is turned off and becomes Ov.

Since the signal output is always based on OV, by setting the size detection signal to Lo-, it is possible to enlarge and output only the portion (bright portion) where the output of the CCD is high.

The signal obtained in this way is as shown in the first drawing. Then, by providing a threshold value between the background level (blank paper level), the pressure plate level, and the level due to the diffused reflection at the edge and binarizing the signal, the shaded area in FIG. 8 can be detected.

Although the resolution in the sub-scanning direction is 16 lines/square, the width by which the amount of light is increased can be approximately 30 to 50 lines.

Next, a method of confirming the size from this edge detection signal will be explained.

In order to obtain document size information from this signal, it is necessary to obtain the position (address) in the sub-scanning direction (X direction) and the length in the main scanning direction (X direction).

FIG. 12 is an example of a size detection circuit.

The timing of each signal is shown in FIG.

LSYNC is a line synchronization signal, and data from the line image sensor line is read during this one cycle. CK is a pixel clock, and one period corresponds to one pixel. The number of data in one line is 5000.

YSYNC is a signal delayed from LSYNC, and rises when data in the main scanning direction is valid.

If the document reference is at a corner as shown in FIG. 8(a), select the position immediately after the image data becomes valid, and if the document reference is the center reference as shown in FIG. 8(b), it should rise near the center.

FIG. 12 will be explained using these signal configurations.

First, as described above, in order to separate the edge and other white levels, data is binarized using a certain threshold (a signal in which the edge becomes "H").

To determine the length in the main scanning direction, an X counter that can count the number of pixels for each line is provided, and this counter is
The width of this end signal “H” is 3 as described above.
There are 0 to 50 lines, and the closer to the center, the more reliable the data. As you move away from the center, this count value becomes shorter or is interrupted in the middle, so this 30
The line with the longest count value among the ~50 lines is retained to finally obtain XCNT.

The position in the sub-scanning direction is determined by providing a Y counter that counts the number of lines from the start of the traveling body, and holding the value of the Y counter when the end signal becomes "H".
Obtain CNT. At this time, in order to prevent false detection and to obtain an accurate position, the YCNT is obtained after the end signal becomes "H" for several lines in a row.

The XCNT and YCNT obtained in this manner are given as numerical values in units of one pixel pitch. If you are not sure about the accuracy, you can give the counter clock in large units. If the standard size (A4.A3°, B4.B5, etc.) is simply identified from the XCNT and YCNT, a simple count is sufficient. Applied to functions such as comparing the original size and the printer's transfer paper size and automatically determining the output according to the transfer paper size using variable magnification and fine precision (in 1% increments, independent of vertical and horizontal directions). can.

This method is effective for both document standards shown in FIGS. 8(al) and (b), but when using the center standard, the circuit shown in FIG. 14 is added in addition to the circuit shown in FIG. By detecting the document start address of , it is possible to correct the misalignment of the document placement (XSTART).

In the case of (al corner reference), the two sides are fixed, so misalignment when placing the original is not a problem, but (bl
In the case of the central reference, only one side is fixed, which solves the problem of difficulty in placing the original when positional accuracy is required.

In other words, from the main scanning direction start position and the main scanning direction length,
It is possible to calculate the difference between the center reference position and the center of the document and correct the deviation when outputting image data to the printer section.

As a means of converting signals such as XCNT, YCNT, and X5TART into size information, etc., there is a method in which a comparison with a standard size value is performed by hardware and converted into a size signal (for example, A3=OO.

A4=01. B4=10. B5=11 etc.)
, or a method in which the value is input to the CPU and processed by the CPU is easily considered.

Next, the main parts of the present invention will be explained.

The present invention uses coordinate data detected from paper size to generate data convenient for sending by facsimile,
The original is sent based on this data.

FIG. 15 shows the detected coordinates of the original when the original is placed on the contact glass 201 (401).

FIG. 16 shows a flowchart for detecting the width and length of the document from the above coordinates.

A block diagram for storing data in a page memory in the 17th country is shown. Further, timing charts of each signal are shown in FIG. 18 and FIG. 22.

FIGS. 19 and 20 show one line of data for each size.

FIG. 21 shows the flow of the reading operation corresponding to the document size.

In FIG. 16, first the length in the X direction is detected (SL
), if this length is shorter than 216fi (Y in S2
), A4-width paper is set (S3). Also 256
If it is smaller than a crane (Y in S4), 84-width paper is set. Further, if the length of the document in the Y direction is larger than 256fi (N in S4), an A3-width sheet is set (S6). Next, the length in the X direction is detected (S7)
.

In FIG. 17, Data 1. 2 is scanner 2
00 indicates the image data read. In this example, a 2-bit serial is shown. CLK is CLK corresponding to image data. LSYNC is a main scanning synchronization signal,
It has a width of 8 clocks.

Fgate indicates a gate signal in the sub-scanning direction and indicates the length of the document.

In this example, transmission is performed by first detecting the document size, reading the document based on the detected data, transferring the data to the page memory 500, and transmitting it as is.The control regarding the transmission is in accordance with the above explanation. In addition, 501 is a serial/parallel converter, 502 is a CPU, 503 is a clock controller, 504 is an address register, 505
is an address counter.

The operation according to an embodiment of the present invention will be explained with reference to the block diagram shown in FIG. 17 and the flow shown in FIG. 21.

In FIG. 21(a), S10: Blisscan is performed to detect two coordinates (at, bl) of the document in FIG.

S11; A3, S4 through the flow of Figure 16 from the coordinates
．． The image is divided into A4 sizes, and the image size X, Y and deviation from the reference (x+, Yl) are detected.

S12: When storing data in the page memory 500 through this flow, calculate which address to start storing data from. In general, the standard for facsimiles is center feed, so the classification is A.
If the actual document is A5 in step 4, offset it by Km as shown in Figure 20 and align it with the center. In this mode, you may use a dip switch or the like to turn on or off K.

S13: Start the scanner 200 for reading.

S14: Detect whether reading is completed.

Once finished, proceed to the next step.

515.516; Return the scanner to the home position.

Next, the initial value is calculated in FIG. 21 (bl).

31B, S19; Check which size is determined according to the flow shown in FIG.

320, S21. S22. An offset value K for converting the original image to the center reference is calculated. This K is sent to address register 504.

S23; Send coordinate data x, y to the clock controller 503.

Next, the flow shown in FIG. 21(C) will be explained.

In this flow, processing is performed using an interrupt caused by the rising edge of LSYNC, and control is performed for each line.

The page memory 500 is A3 size and consists of 304 bytes in the X direction (main scanning direction) and 415 bytes in the X direction (sub scanning direction), and after processing one line, it is necessary to specify the next address. .

S24: Add the number of bytes for one line to the initialized memory address to calculate the next address and send it to the address register 504.

S25. Address counter 5 that counts LSYNC
Add 1 to 05.

S26. S27: Check whether the address counter 505 has become equal to 6X'' (the length of the document) calculated in the flow shown in FIG.

The circuit shown in FIG. 17 operates as follows according to the flows shown in FIGS. 16 and 21.

The value indicated at 323 (in FIG. 21) (X,.

y,) counts down the number of LSYNCOs and CLKOs, and when the values reach "0", writing to the memory becomes valid. By this operation, the document position shown in FIG. 15 is apparently upwardly offset to the reference position.

Writing to the page memory 500 starts from the memory address indicated by bl in FIG. , continues until the value reaches the value "Y" shown in the flowchart of FIG. 16. At this value, writing stops until the next LSYNC resets these counters, At this signal, write to the address of the clothes again (.

The reason why the address part is divided into address register 504 and address counter 505 in FIG.
This is because the processing time of 02 is long.

In this way, by controlling the input to the page memory 500 based on the coordinates of the document, normal facsimile transmission can be performed even for irregular-sized paper or for documents placed at positions other than the reference position.

The image length data to be sent to the other party is controlled by the value of "X" in the flow shown in FIG.

[Effects of the Invention] As explained above, according to the invention described in claim 1.2, the width and length of the original are calculated from the coordinates of the original, and the amount of deviation of the original is corrected before reading. , can always accurately read documents and send faxes.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of a facsimile machine according to an embodiment of the present invention, FIG. 2 is a schematic diagram thereof, FIG. 3 is a schematic diagram showing an example of a reversing mechanism, and FIG. 4 is a facsimile transmission procedure. 5 is a signal arrangement diagram illustrating the format of a transmission control signal, FIG. 6 is a schematic diagram of a document reading device according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating an example of image reading. Block diagram, Figure 8 is a diagram showing how to place different documents, Figure 9 is a diagram showing how to irradiate to detect the edge of the document, and Figure 10 is a block diagram showing control of the black and white range at that time. , FIG. 11 is a diagram for explaining the level signal obtained by the circuit shown in FIG. 10, FIG. 12 is a block diagram showing an example of the size detection circuit, FIG. 13 is a timing chart of each signal, and FIG. Figure 14 is a circuit diagram added for central reference document detection, Figure 15 is an explanatory diagram of document coordinates, Figure 16 is a flowchart for detecting document width and length, and Figure 17 is an accumulation block for image position data. Figure 18 is a timing chart, Figures 19 and 20 are explanatory diagrams of one line of data for each size, Figure 21 is a flowchart of the reading operation corresponding to the original size, and Figure 2
Figure 2 is a timing chart. 500... Page memory, 501... Serial/parallel converter, 502... CPU, 503... Clock controller, 504... Address register, 5
05...Address counter. Figure 6 Figure 7 409 413 4/4 430 Figure 8 (a)
(b) Figure 9 Figure 11
1-1 Octopus-8 box ゝFigure 15Figure 16Data A3151″Ehi-Eyo

Claims (2)

[Claims] (1) A facsimile machine equipped with a document reading device having a function of detecting the position of a document on a contact glass, which is equipped with means for calculating a predetermined document width and length required for facsimile transmission from a document position signal. A facsimile device characterized by: (2) A facsimile apparatus according to claim 1, further comprising means for correcting and reading the amount of deviation of a document set at a position deviated from a reference position based on position data of the document.