JP3031483B2 - Facsimile machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus provided with a document reading device having a function of detecting a position of a document on a contact glass.

[Conventional technology]

Generally, in order to read the size of the document placed on the contact glass, a sensor arranged at a predetermined position,
The detection is performed by detecting the end of the document.

[Problems to be solved by the invention]

However, in the above-described conventional apparatus, since the document size is detected by a small number of sensors, a standard size can be detected, but a special size such as an irregular size or foreign paper is not normally detected, and the document size is not detected. The automatic paper selection mode, which automatically selects paper according to, does not function properly.

In this case, when copying, the output can be viewed, so if an abnormal copy occurs, it is sufficient to copy again.
When facsimile transmission is performed, since no record remains on the transmission side, the image is transmitted with the image cut out, which often causes a complaint.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus capable of correctly determining the size of a document regardless of the position where the document is placed, correcting the deviation during facsimile transmission, and performing facsimile transmission correctly.

[Means for solving the problem]

The above object is to provide a facsimile apparatus provided with a document reading device having a function of detecting a position of a document on a contact glass, to detect a gap between the edges of the document, and to perform a predetermined document necessary for facsimile transmission from a position signal of these documents. A first means provided with a means for calculating a width and a length, and a control means for correcting a deviation amount of a document set out of a reference position based on position data of the document and reading the result and storing the same in a storage means Is achieved by

[Operation] According to the first means, the interval between edges of a document is detected, the width and length of the document are calculated from the coordinates of these documents, the displacement of the document is corrected, read, and stored in the storage means. , Regardless of the center reference, one-sided reference, that is, regardless of the setting position of the document, correctly determine the size of the document,
Facsimile transmission after correcting the deviation.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a facsimile apparatus according to one embodiment of the present invention.

This facsimile machine uses contact glass (described later)
A document conveying device 100 for conveying a document, a scanner 200 for decomposing an image of the document positioned on the contact glass at a predetermined resolution and photoelectrically converting the image, and an image read by the scanner 200 are housed in three paper cassettes. It is configured by a copying apparatus 300 that records on any size of recording paper and has a double-sided copying function, and has basically the same configuration as a well-known digital copying machine. In the document feeder 100, a document placed on a document table 101 is sent out one by one by a feed roller 102, and is positioned at a predetermined position on a contact glass 201 by a transfer belt 103. When the image of the document is read, the document is removed from the contact glass 201 by the transport belt 103 and discharged to the discharge tray 104. In the scanner 200, the image of the document positioned on the contact glass 201 is scanned in the direction of the arrow by the optical system 202, and the image obtained by scanning (hereinafter referred to as scan light) is sent to the line image sensor 203. It is imaged. The line image sensor 203 is
The scan light of the scan line of the optical system 202 is decomposed into a predetermined number of pixels, and the image of each pixel is photoelectrically converted, thereby forming electrical image information. This Sukiana
The resolution of 200 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 about twice as large in the main scanning direction and about four times in the sub-scanning direction as compared with the standard resolution of the facsimile machine (8 dots / mm in the main scanning direction and 3.85 lines / mm in the sub-scanning direction). It is about twice as high in both the main scanning direction and the sub-scanning direction as compared with the high resolution (8 dots / mm in the main scanning direction and 7.7 lines / mm in the sub-scanning direction). In the copying apparatus 300, a laser beam output from a laser writing unit 301 that scans a laser beam modulated by image information is applied to a drum-shaped photosensitive member 302. 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 the surface thereof is uniformly charged by a charging charger 303, and the charged surface is exposed to a laser beam to form an electrostatic image corresponding to a recorded image (image information). A latent image is formed, and this electrostatic latent image is developed with toner by a developing device 304. On the other hand, the recording sheets stacked on the selected one of the three paper feed cassettes 305, 306, and 307 are the respective paper feed cassettes.
Sheets are fed one by one from the uppermost one by sheet feed rollers 308, 309, 310 corresponding to 305, 306, 307. The recording paper sent out by the paper feed rollers 308, 309, 310 in this way is sent out to the photosensitive member 302 by the registration roller 311 at the timing when the leading end of the recording paper coincides with the leading end of the toner image. The recording paper sent to the photoconductor 302 is brought into close contact with the photoconductor 302 by a transfer charger 312 to transfer the toner image, is separated from the photoconductor 302 by a separation charger 313, and is further separated by a fixing device 314. Is fixed on the surface. Then, the recording paper on which the fixing is completed is conveyed by a discharge roller 317 via a distribution unit 315 and a reversing unit 316, and is discharged outside the apparatus. The recording paper discharged outside the machine is sorted 31
8, a stacker 319 for stacking recording paper on which a copy image is recorded during a copying operation, or a stacker 32 for stacking recording paper on which a reception image is recorded during facsimile reception.
Sorted into any of 0. The distributing section 315 transfers the recording paper on which the image is recorded to the reversing section 316, the discharge roller 317,
The transport unit 321 is for transporting the recording paper on which the image shown in FIG. 1 is recorded to the registration roller 311 again at the time of double-sided copying. Photoconductor 302
The remaining toner on the surface is removed by the cleaning unit 322, and the residual charge is removed by the charge removing lamp 323.

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

In the figure, reference numerals 315a, 315b, 315c, 315d denote transport rollers for transporting the recording paper, and 315e, 315f denote branch plates for switching the transport path of the recording paper. With the recording paper turned over,
That is, when the image is discharged with the surface on which the image is recorded facing down, the branch plate 315e is urged in the A1 direction and the branch plate 315f is urged in the A3 direction. And the recording paper is transported by
D and E are sequentially conveyed to the discharge roller 317 through the discharge roller 317 and discharged outside the machine. With the recording paper as it is,
When discharging with the image recording surface facing up, the branch plate 31
5e is urged in the A2 direction. Then, the recording paper is conveyed to the discharge rollers 317 through the conveyance path “F”, and is discharged out of the apparatus. When sending the recording paper to the transport unit 321, the branch plate 3
15e is urged in the A1 direction, and the branch plate 315f is urged in the A4 direction. Then, the recording paper sequentially passes through the conveyance paths A, B, C, D, G, and C, and is sent out to the conveyance unit 321.

FIG. 1 shows an example of a control system of the facsimile apparatus. In the figure, an output image signal of a line image sensor 203 is amplified to a predetermined amplitude by an AGC (variable gain control) amplifier 11 and converted to a digital signal of a predetermined number of bits by an analog / digital converter 12. Are added to the image processing unit 13. The image processing unit 13 performs shading correction processing for correcting variations in image signal levels caused by variations in characteristics of the optical system 202 of the scanner 200 and variations in light receiving characteristics of each bit of the line image sensor 203, and the like. The gamma correction process that corrects the difference between the reading characteristics and the human visual characteristics to convert the image read by the scanner 200 into a visually optimal image, the MTF correction process that eliminates image blur, and the Background removal processing for properly extracting images of dark-colored originals or originals with dirty background, halftone processing for pseudo-gradation of images, character part and halftone processing for binarization processing This realizes character / halftone separation processing for separating an image to be processed and various other image processing. The image information processed by the image processing unit 13 is image-compressed by the image processing unit 14 in the most efficient manner, and image data corresponding to the compressed image information is stored in the image memory 15. The image memory 15 has a storage capacity capable of storing about several tens (for example, about 20 to 60) image information of a standard document in a compressed state. -The read operation is controlled. 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 laser diode 18 is restored. A laser beam modulated by an image signal (image information) is generated from the image data. The laser diode 18 is provided in the laser writing unit 301 of the copying machine 300. The image processing unit 14 also executes density conversion processing for converting the linear density of the image and scaling processing for reducing and enlarging the image. The operation display unit 19 includes operation keys necessary for operating the apparatus as a copier or a facsimile, and a display for displaying an operation state, an operation procedure, and the like of the facsimile apparatus. The operation keys include, for example, a start key for starting a facsimile transmission operation, a copy key for starting a copying operation, a stop key for stopping a copying operation, and inputting numerical data such as the number of copies and a telephone number. A numeric keypad, an abbreviated key for inputting a telephone number, a mode key for setting various operation modes of the facsimile apparatus, and a guidance key for selecting a selection item displayed on the display. . In addition, a liquid crystal display device or the like having a large degree of freedom in display is used as a display, and message information of an operation procedure, a numerical value input with ten keys, the actual number of copies, and the like are displayed.
The DF controller 20 controls the document feeder 100, the scanner controller 21 controls the scanner 200, and the copy controller 22 controls the copy device 2.
00 controls the operation of each part. And these
DF control unit 20, scanner control unit 21, copy control unit 22, image processing unit 13, memory control unit 15, and laser diode driver
17 is controlled by the system control unit 23 in terms of operation timing, operation mode, and the like. The memory control unit 15 and the copy control unit 22 exchange information for synchronizing the operation of the laser writing unit 301. Facsimile control unit 24
Executes a transmission control procedure for facsimile transmission, and controls the image compression / decompression unit 26, the modem 27, and the network control device 28 to transmit and receive image information. The facsimile control unit 24 exchanges control information and the like with the system control unit 23 and the memory control unit 16. Image compression / decompression unit
Numeral 26 is for compressing an image to be transmitted by a code compression method at the time of facsimile transmission and for expanding a received image to an original image signal, and can perform compression / expansion processing by 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 a received signal to demodulate the original digital data. The modem 27 can execute modulation / demodulation processing using a plurality of modulation methods. For example, it is composed of a unit for realizing each of the modulation and demodulation processes in the G1, G2, and G3 facsimile modes. The network controller 28 is for connecting the facsimile apparatus to a transmission line (in this case, a public telephone network) and has an automatic transmission / reception function. 29 is a character energy generator. Note that input data from the operation display unit 19 is notified to the facsimile control unit 24 via the system control unit 23, and display data from the facsimile control unit 24 to the operation display unit 19 is operated via the system control unit 23. The information is output to the display unit 19, and control information from the facsimile control unit 24 to the image processing units 13 and 14 is also output via the system control unit 23.

 Next, the facsimile transmission operation will be described.

In the facsimile transmission procedure, as shown in FIG. 4, when the receiving side is called from the transmitting side (call signal CNG) and the line is established as shown in FIG. 4, the receiving side indicates that the receiving side is a non-voice terminal. After responding to the call station identification signal CED, the digital identification signal DIS indicating the reception function of the own station
To respond. The transmitting side selects the function to be used for facsimile transmission from the content of the received digital identification signal DIS, displays it in the digital command signal DCS, notifies the receiving side, and sets the modem speed to the transmission speed selected at that time. Set up and run 1.5 seconds of training (Training Check TCF). If the result of the modem training is good, the receiving side responds to the transmitting side with the reception preparation confirmation signal CFR, and prepares for image reception at the modem speed at that time. The transmitting side that has received the reception preparation confirmation signal CFR transmits a training signal TNG corresponding to a training sequence according to the standard of the modem corresponding to the set modem speed, and then transmits the image information MSG of the first page, and If there is an image, the multi-page signal MPS is transmitted. If the receiving image can be properly received at that time, the receiving side responds with the message confirmation signal MCF and prepares for receiving the image of the next page. The transmitting side that has received the message confirmation signal MCF transmits the training signal TNG again, transmits the image information of the second page, and transmits the procedure end signal EOP when ending the transmission. The receiving side responds to the message confirmation signal MCF in the same manner as for the first page, and upon receiving the message confirmation signal MCF, the transmitting side transmits a disconnection command signal DCN to disconnect the line and terminate the facsimile transmission. The receiving side receiving this disconnection command signal DCN disconnects the line. An image is transmitted by performing such a series of facsimile transmission procedures. At this time, 2400-9600b is used for transmission of training check TCF and image information.
PS high speed modem is used, for example, digital identification signal
A 300 bps low-speed modem is used for transmitting other transmission control procedure signals such as 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 standardized by CCITT (International Telegraph and Telephone Consultative Committee) recommendation T.30.

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, an 8-bit address part A, and an 8-bit address. The control unit C comprises an 8-bit facsimile control unit FC, an n-bit facsimile information unit FI.16-bit flag check sequence FCS, and an 8-bit flag F. The flag F is composed of a bit string of “01111110”, the address part A is composed of a bit example of a global address “11111111” representing an unspecified partner, and the control part C is “1100X000” (X is The facsimile control unit FC comprises a bit sequence representing each transmission control procedure signal, and the facsimile information unit FI comprises a bit sequence of "0" in the non-last frame and "1" in the last frame. Signal (DIS, DCS, DT
C, NSS, NSF, etc.)
The flag check sequence FCS is composed of a bit sequence of a CRC (Cyclic Redundancy Check) code obtained by applying a predetermined generator polynomial to the bit sequence from the address section A to the facsimile information section FI.

When the operator sends a document to be sent,
When the facsimile mode is selected on the operation display 19, the destination is input, and the start key is turned on to start the transmission operation, the system control unit 23 transmits the data input by the operator to the facsimile control unit 24. To start the facsimile transmission operation, and instruct the DF control unit 20 to convey the transmission original. As a result, the document to be transmitted by the document conveying device 100 is
The DF control section 20 notifies the facsimile control section 24 of the result of the determination by the DF control section 20 via the system control section 23. Considering the case where the operator selects the immediate transmission mode and selects one destination, the facsimile control unit 24 transfers the telephone number of the destination to the network control device 28 to call the destination, and it is described above that the line is established. Execute the transmission control procedure to determine the receiving function of the destination,
The one to be used is selected and notified to the destination. At this time, the receivable size of the destination and the size of the transmission document are compared, and if they are different, the image of the transmission document is scaled to the receivable size of the destination and transmitted.

Incidentally, in a normal facsimile apparatus, it is rare to use a size other than A4 to A3 size for recording paper, but a facsimile apparatus which can use many types of recording paper as in the apparatus of this embodiment. In the meantime, the recording paper may be selected according to the actually set recording paper, and in such a case, such a wide range of magnification may be applied. Of course, in that case, in the pre-transmission procedure, the user is notified of his / her function by a non-standard device signal or the like, and all available recording paper is sent to the destination.

By the way, when reducing the image of the transmission original, if the reduction ratio is large, the reduced image becomes difficult to see, and the image quality at the destination may be extremely deteriorated. Therefore, the facsimile control unit 24 stabilizes the image quality by setting the read line density according to the magnification.

 Next, the document size detection will be described.

FIG. 6 shows a document reading apparatus applied in the present invention.

In the figure, a contact glass 401 for placing a read original is illuminated by light sources 402a and 402b, and light reflected from an image surface of the read original is reflected by mirrors 403, 404, 405, 406 and 407.
Then, an image is formed on the light receiving surface of the line image sensor 409 via the lens 408 and the lens.

The light source 402 and the mirror 403 are made of contact glass.
The mirror 404, 405 is mounted on the traveling body 410 that moves in the sub-scanning direction in parallel with the contact glass 401 on the lower surface of the 401, and the traveling body 411 that moves in the sub-scanning direction at half speed in conjunction with the traveling body 410. The optical system moves, and the image surface of the read document is scanned in the sub-scanning direction.

Further, the resolution of the image reading in this embodiment is set to 16 pixels / mm, so that an A3-size original can be read. Therefore, in order to read the short side 297 mm of the A3 size (297 mm × 420 mm) in the main scanning direction, a 5000 pixel CCD line image sensor is used as the line image sensor 409.

In a conventional ordinary reading apparatus, the traveling bodies 410 and 411 are used.
The image data is read in the forward movement of the movement, and returns to the original position (home position) in the return movement to perform one reading operation.

In the reading operation according to the present invention, (1) 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 second and subsequent reciprocating movements.

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

Two types of operations are possible.

In (1), a document size detection is added as a press cancel before a normal operation, and it takes time for the size detection. On the other hand, in the case of (2), the size detection and the reading operation are performed by one reciprocating motion which is the same as the normal operation, so that there is a temporal advantage.

However, there is usually a home position of the traveling bodies 410 and 411 on the reference position side where the document is placed on the contact glass 401, and when the size detection is performed in the forward movement and the image reading is performed in the backward movement, the reading start position becomes the size. Therefore, control when outputting image data to a printer or the like becomes slightly complicated.

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

Next, the flow of image data at the time of image reading will be described.

 FIG. 7 shows an example.

In the figure, a line image sensor 409 is driven by a sensor driver 412,
The output signal of the A / D converter 41 is amplified by the amplifier 413.
4 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 for correcting illuminance unevenness of a light source and sensitivity variations of elements of the line image sensor 409, and blurring due to an optical system is corrected by an MTF correction unit 416. .

In this embodiment, the zooming method uses a zooming method by processing an electric signal in the main scanning direction (main scanning zooming unit 417), and in the sub-scanning direction, the reading timing of the image sensor 409 is kept as it is, and the traveling bodies 410 and 411 By changing the moving speed of the

In 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 predetermined threshold in a binarization processing unit 418,
The output circuit 419 outputs the data to the printer unit.

The threshold value of the binarization processing unit 418 may be changed according to the image density, and a process of converting to a pseudo halftone may be performed. Size detection uses A / D converted data (4
20 is a size detection circuit).

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

Normally, the original 421 is placed on the contact glass 401 with reference to a corner as shown in FIG. 8A or with reference to the center of one side as shown in FIG.

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 FIG.

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

Normally, two fluorescent lamps or lamps 402a and 402b are used to increase the illumination efficiency and eliminate irregularities on the original surface and shadows at the edges in the reading operation. Although a plate is provided, this is used in reverse to detect hatched portions.

That is, in FIG. 9, a fluorescent lamp 40 for irradiating the document end from the right side is used.
By turning on only 2b and turning off the left fluorescent lamp 402a, diffuse reflection at the end is used as shown in the figure, so that the amount of light entering the image sensor 409 is increased only at the end.

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. In that range, as a black reference
Since it is divided into 64 gradations, even if the amount of light increases at the end, it cannot be detected as it is.

It is necessary to reduce the amount of illumination itself by turning off one fluorescent lamp or eliminating a reflector, and to further work on a monochrome range.

That is, when performing size detection, the range does not need to be the range used when reading a normal image, and image information may be killed. Therefore, the level of the black reference is raised so that the light amount difference can be obtained only in the portion close to white, and the above-mentioned light amount increase at the document end is detected.

 The method of operating this range is described below.

In FIG. 9, the image data formed on the CCD is a CCD.
Is separated into ODD output (OS1) and EVEN output (OS2) inside and output in zigzag. In this example, a CCD having reset clock noise compensation output (DS1, DS2) terminals is output.

The differential amplification of OS1 and DS1 is performed by the OP amplifier A1, the noise of the reset clock is canceled, and only the signal is extracted.

Similarly, the signal of OS2 is extracted by differential amplification (2) (the internal circuit is the same as that of differential amplification (1)).

The signal output in this way is connected to the ODD output (OS1).
Since the output (OS2) on the EVEN side is output in a staggered pattern, those outputs are switched by the gate (1) and (2) signals.
Are turned on / off.

Next, amplification and impedance conversion are performed by the OP amplifier A2, and input to the A / D _VIN . This A2 is SW3, SW
4 The can change the gain in response to changes in the light intensity of the fluorescent lamp due to temperature or aging, the gain (1), by determining the (2) signal, V _IN when reading the reference whiteboard Is not changed greatly.

The A / D reference voltages Vref + and Vref-
It is made by amplifiers A3 and A4. The + side reference voltage is fixed to a voltage determined by the Zener diode ZD. However, the voltage of the negative reference voltage Vref- is changed by turning on / off the switch SW5.

When the enlargement signal is high, SW5 is turned on, so Vref-
Becomes 0V, but when the size detection signal is Low, SW5 turns off, Becomes

Since the signal output is always output based on 0V, by setting the size detection signal to Low, only the high-output portion (bright portion) of the CCD can be enlarged and output.

The signal thus obtained is as shown in FIG. Then, a threshold value is provided between the background level (blank sheet level) and the pressure plate level and the level due to the edge irregular reflection to binarize the signal, whereby the hatched portion in FIG. 8 can be detected. The resolution in the sub-scanning direction is 16 lines / mm, but the width of this light amount increase can be about 30 to 50 lines.

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

In order to convert the signal into document size information, the position (address) in the sub-scanning direction (y direction) and the main scanning direction (x
Direction).

 FIG. 12 shows an example of the size detection circuit.

 The timing of each signal is shown in FIG.

LSYNC is a line synchronization signal, and reads data of one line of the line image sensor during one cycle. CK is a pixel clock, one cycle and one pixel. The number of data in one line is 5000.

YSYNC is a signal obtained by delaying LSYNC and has a rising edge when data in the main scanning direction is valid.

If the document reference is a corner as shown in FIG. 8 (a), the position immediately after the image data becomes valid is selected, and if the document reference is the center reference as shown in FIG.

 FIG. 12 will be described with these signal configurations.

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

The length in the main scanning direction is counted by providing an X counter capable of counting the number of pixels for each line and enabling this counter only when the end signal is "H". The width of the end signal “H” is 30 as described above.
There are ~ 50 lines, of which the closer to the center, the higher the reliability of the data. Since the count value becomes shorter or is interrupted in the middle as the distance from the center increases, the one with the longest count value among these 30 to 50 lines is held to finally obtain the XCNT.

For the position in the sub-scanning direction, a Y counter for counting the number of lines from the start of the traveling body is provided, and the value of the Y counter when the end signal becomes "H" is held.
Get NT. At this time, in order to prevent erroneous detection and to obtain an accurate position, YCNT is obtained after the end signal becomes "H" for several consecutive lines.

The XCNT and YCNT obtained in this way are given as numerical values in units of one pixel pitch. If the accuracy is uncertain, the clock of the counter can be given in large units. From this XCNT and YCNT, simply use the standard size (A4, A3, B4,
If you only need to identify B5, etc.), you can use an easy count. If the document size is different from the size of the transfer paper of the printer, it is applied to a function that automatically determines the magnification and fine precision (in 1% steps, independent of height and width) so that the output matches the transfer paper size. it can.

This method is effective for both original references in FIGS. 8 (a) and 8 (b). However, in the case of the center reference, in addition to the circuit shown in FIG. 12, the circuit shown in FIG. By detecting the document start address in the direction, it is possible to correct the displacement of the document placement (XSTART).

This is because the two sides are fixed in the case of the corner reference in (a), so that there is no problem when the document is set,
Since only one side is fixed in the case of the center reference in (b), it is possible to solve the problem that it is difficult to set a document when positional accuracy is required.

That is, the difference between the center reference position and the center of the document is calculated from the start position in the main scanning direction and the length in the main scanning direction, and the shift can be corrected when the image data is output to the printer unit.

As a means for converting signals of XCNT, YCNT, XSTART, etc. into size information, etc., a method of comparing with a fixed size value by hardware and converting it into a size signal (for example, A3
= 00, A4 = 01, B4 = 10, B5 = 11, etc.), or a method of inputting the value to the CPU and processing it by the CPU can be easily considered.

 Next, the main part of the present invention will be described.

According to the present invention, data useful for facsimile transmission is generated using coordinate data detected from a paper size, and a document is transmitted based on this data.

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

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

FIG. 17 is a block diagram for storing data in the page memory. 18 and 22 show timing charts of each signal.

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

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

In FIG. 16, first, the length in the Y direction is detected (S
1) If this length is shorter than 216mm (Y in S2), A4
A sheet having a width is set (S3). If it is smaller than 256 mm (Y in S4), a sheet of B4 width is set. Further, if the length of the document in the Y direction is greater than 256 mm (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 and 2 indicate image data read by the scanner 200. In this example, a 2-bit serial is shown. CLK is CLK corresponding to image data. LSYNC is a main scanning synchronization signal and has a width of 8 clocks.
Fgate indicates a gate signal in the sub-scanning direction, and indicates the length of the document.

The transmission in this example is a method of first detecting a document size, reading a document based on the data, transferring the data to the page memory 500, and transmitting the data as it is, and the control relating to the transmission is in accordance with the above description. Reference numeral 501 denotes a serial / parallel converter, 502 denotes a CPU, 503 denotes a clock controller, 504 denotes an address register, and 505 denotes an address counter.

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

In FIG. 21 (a), S10; Purisukiyan, and the coordinates of the original Figure 15 two positions (a _1, b ₁₎ is detected.

S11; detecting a deviation (X _1, Y ₁₎ from the image size X, Y and criteria with divided into one through flow of FIG. 16 from the coordinates of A3, B4, A4.

S12: When storing the data in the page memory 500 through this flow, it is calculated from which address. In general, the facsimile is standardized for center feeding. Therefore, when the section is A4 and the actual document is A5, the offset is set by Kmm as shown in FIG. In this mode, switching between attaching and not attaching K may be performed by a dip switch or the like.

S13: The scanner 209 is started for reading.

S14: It is detected whether the reading is completed. If it is completed, proceed to the next.

S15, S16: Return the scanana to the home position.

 Next, an initial value is calculated in FIG. 21 (b).

S18, S19; Check which size is determined by the flow shown in FIG.

S20, S21, S22: The offset value K for converting the image of the original to the center reference is calculated. This K is sent to the address register 50.

S23; the black poke controller 503 sends the X _1, Y ₁ coordinate data.

 Next, the flow of FIG. 21 (c) will be described.

In this flow, processing is performed by interruption at the rise of LSYNC, and control is performed for each line.

Page memory 500 is A3 size and Y direction (main scanning direction) is 304
The byte and the X direction (sub-scanning direction) are composed of 415 bytes. When processing of one line is completed, it is necessary to specify the next address.

S24: Add the number of bytes of one line to the initially set memory address, calculate the next address, and set the address register 50
Send to 4.

S25: The address counter 505 for counting LSYNC is incremented by one.

S26, S27: The address counter 505 checks whether it has become equal to "X" (the length of the document) calculated in the flow shown in FIG. 16, and if equal, sets the reading completion flag in S27.

The circuit shown in FIG. 17 operates as follows by the flow shown in FIGS. 16 and 21.

According to the values (X ₁ , Y ₁ ) indicated in S23 of FIG. 21 (b)
Count down the number of LSYNCs and CLKs and set the value to “0”
Enables writing to memory from By this operation, the document position in FIG. 15 is apparently offset to the reference position.

Writing to the page memory 500 starts from the memory address specified in FIG. 21B, and is written in byte units (or word length or the like is possible). Each time one byte is written, the counter is incremented by one, and the process is continued until the value reaches the value of "Y" shown in the flow of FIG. When this value is reached, the writing is stopped, the counter is stopped at the next LSYNC until these counters are reset, and the signal is written again to the next address by this signal.

The reason why the address portion is divided into the address register 504 and the address counter 505 in FIG. 17 is because the processing time of the CPU 502 is long.

In this way, by controlling the input to the page memory 500 based on the coordinates of the original, facsimile transmission can be performed normally even on an original having an original placed on a place other than irregular-sized paper or a reference position.

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

〔The invention's effect〕

As described above, according to the first aspect of the present invention,
Detecting the interval between the edges of the original, calculating the original width and length from the coordinates of these originals, correcting the amount of misalignment of the original, and reading and storing it in the storage means, regardless of the center reference or one-side reference In other words, since the size of the original is correctly determined regardless of the set position of the original, the deviation is corrected and the facsimile transmission is performed, the facsimile transmission can be correctly performed, and the facsimile transmission operation is facilitated.

[Brief description of the drawings]

FIG. 1 is a control block diagram of a facsimile apparatus according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram thereof, FIG. 3 is a schematic configuration diagram showing an example of a reversing mechanism, and FIG. 4 is a facsimile transmission procedure. FIG. 5 is a signal arrangement diagram illustrating the format of a transmission control signal, FIG. 6 is a schematic diagram of a document reading apparatus according to an embodiment of the present invention, and FIG. FIG. 8 is a diagram showing how to place different originals, FIG. 9 is a diagram showing an irradiation method for detecting the end of the original, and FIG. 10 is a block diagram showing control of a black and white range at that time. FIG. 11 is a diagram for explaining a level signal obtained by the circuit shown in FIG. 10, FIG. 12 is a block diagram showing an example of a size detection circuit, and FIG. 13 is a timing chart of each signal. , FIG. 14 is a circuit diagram added for detecting a document based on the center, FIG. 15 illustrates the original coordinates, the 16
The drawing is a flowchart for detecting the width and length of the original, FIG. 17 is a block diagram of the accumulation of image position data, FIG. 18 is a timing chart, and FIGS. 19 and 20 are explanations of one line of data in each size. FIG. 21 is a flowchart of the reading operation corresponding to the document size, and FIG. 22 is a timing chart. 500… Page memory, 501… Serial / parallel converter, 502… CPU, 503… Clock controller, 504…
... Address register, 505 ... Address counter.

Claims (1)

(57) [Claims] In a facsimile apparatus provided with a document reading device having a function of detecting the position of a document on a contact glass, a predetermined interval required for facsimile transmission is detected based on a position signal of the document by detecting the edge of the document. A document width and length calculation means; and a control means for correcting a deviation amount of the document set from the reference position based on the document position data, reading the corrected value, and storing the corrected value in the storage means. Facsimile machine.