JPS6091761A - Picture reader - Google Patents

Abstract

PURPOSE:To improve the operability at the generation of overflow or the like by selecting a picture read mode in response to the state of a storage means storing read picture information. CONSTITUTION:When an operating section 59 selects a transmission mode and a start button is depressed, a signal similar to that for the original carrying operation of the copy mode is fed to an original carrier device A from a reader section B and the original carrying reading is started. Then a CCD45 reads the picture information, an A/D converter 46 converts it into a digital signal, and a compression processing circuit 47 applies compression processing, then the signal is stored in a picture buffer memory 48. If the memory 48 overflows in the transmission operation, a control section 56 turns off a command signal (MODE signal) of the original still reading fed to the original carrier A. Then the original carrier A stops the original at a position where the tip of the original is matched to a point (b) of the original stop position (b).

Description

[Detailed Description of the Invention] Technical Field The present invention is applicable to two modes: a mode in which document information is read while moving the document (hereinafter referred to as moving document reading), and a mode in which document information is read while the document is still (hereinafter referred to as stationary document reading).
The present invention relates to a document reading device having both functions.

PRIOR ART This type of document reading device, which is conventionally used in facsimile communications, is configured to be able to operate only in the mode of moving and reading the document, and it reads it with COD, performs data compression processing on the digital signal after A/D conversion, and stores it in an image buffer memory. A common method has been to transmit the image information in the image backup memory at time 7c when the communication line becomes communicable while sequentially storing the information.

However, the image buffer memory has a memory capacity for 2 to 6 pages of originals with a standard amount of image information, and the multiple originals placed at the entrance are separated and conveyed one by one using the original moving reading method. In the process of sequentially storing document image information in the image buffer memory, if the image information density of the document is high, the image buffer memory may overflow. This has caused the inconvenience of having to wait until the image buffer memory becomes empty to some extent due to data communication before starting separation and conveyance again.

Therefore, the damage to the manuscript (due to passing it through twice) and operability.

This is a serious problem in facsimiles, etc., which require high reliability over time.

Purpose The present invention has been made in view of the above points, and an object of the present invention is to provide a highly reliable image reading device.

A further object of the present invention is to provide an image reading device that can prevent document damage, improve operability, and minimize time loss during image reading.

Furthermore, the present invention provides a document reading device that can improve operability in the event of an overflow or the like by selecting an image reading mode depending on the state of a storage unit that stores read image information. The purpose is to

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

@Figure 1 is a schematic diagram showing the overall configuration of the present invention, and P
, 2 are circuit diagrams showing the relationship between the document conveying device, part of the reader, and the printer. This will be explained below with reference to FIGS. 1 and 2. Reference numeral A denotes a document conveyance device that conveys a document, and is controlled by a document conveyance IIR control circuit 59. B is a reader part, C is a printer part, and D is a transmission/reception interface that controls transmission and reception of image data. Document transport device (in qA, document loading hopper IK) A large number of documents 2 are placed with the image surface facing downward, and are moved up and down by pickup solenoids 3, utq, uFF.Pickup roller supported by arm 4 5, an upper belt 8 placed between a roller 6 and a driven roller 7 which rotate counterclockwise using a separation motor 75 as a driving source, and a roller 9 and a driven roller which rotate counterclockwise using a minute H+f motor 75 as a driving source. F bell hung between 10) 11
Due to the linked operating pressure, the bottom original of the multiple originals 2 is separated and conveyed and sent to the entrance sensor 12. Thereafter, the Ig document ttp roller 15 rotates when the document holding solenoid 76 is turned on and off and the belt motor 14 is turned on, and the feed roller 17 rotates when the belt motor 14 is turned on and the feed solenoid 16 is turned on to produce one original. passes through the tip detection sensor 18 and faces the platen glass 19 and the endless conveyor belt 20 that is brought close to or in contact with substantially the entire upper surface of the platen glass 19.
The document is conveyed by the frictional force of the endless conveyor belt 20, and at a constant speed movement at a reading position a, the original 4'11 is moved at a constant speed for reading or the original is stopped at a stop position E. Then, the document is still read by scanning operation of the leak part B (D first mirror 21%, second mirror 22, and illumination lamp 23 by the optical system drive circuit 49. After this, the original is read out through the discharge path 24 It passes through the co-sensor 25 and is ejected onto the ejection tray 26 with both 1111 sides facing upward.
(8) A size detection sensor for detecting the size of the document placed on Hotsuber 14C, which uses a movable document guide @290 positions to detect the size in the width direction of the document perpendicular to the document transport direction. Do the following. Further, the document detection sensor 30 detects whether or not a document is placed on the document, and the timing sensor 31 detects whether or not a document is placed on the document.
The rear end of the first document is detected and the next document is separated and conveyed. Note that the original is stopped at the stopping position by the roller 115.
．． The clock pulses output from the disc clock safety sensor 32, which are generated in synchronization with the movement of the downward belt 20 applied to the belt 117, are sent to the front end sensor 18 for a predetermined number of times after detecting the leading edge of the document being fed. This is done by instantaneously stopping the counted belt motor 14. The constant speed drive speed of the belt motor 14 is determined by the pulses of the rotary encoder 33 built into the rotor shaft of the motor 14.
It is determined by the data transferred through the signal line 36 in a time-division manner. 37 to 41 are drivers; 42 is a line driver for sending various signals (described later) output from output ports 08 to 013 of the microcomputer 35 to the reader &IIB; The original is moved and read, or the original is stopped at the original resting position It b.
'In M capture, the reflected light with original information is 1'$'
The light is formed by the lens 44 and is received by the CCD 45 as a slit light having a line length in the width direction of the document, and is transmitted to the A/D converter 46.
After being converted into digital data (M), the data is compressed by a compression processing circuit 47 and stored as image data in an image buffer memory 48.Then, this image data is transferred to the sending/receiving interface D during facsimile mode transmission. The image data is sent from the image data transmitting circuit 50 to the transmitting circuit #J151. Also, when receiving in facsimile mode, the image data from the receiving line 52 is stored in the image buffer memory 48 through the image data receiving circuit 53. After that, The compressed image data is returned to the original image data by the decoding processing circuit source 54, and is sent to the printer part C through the control section 56, which is mainly composed of a microcomputer 55 that controls the entire system. The printer C is controlled by a printing circuit 57, and outputs a θ copy 58 on which the manuscript is copied.

The operation unit 59 is used to operate the entire system, and in addition to a selection switch for setting the entire system to a sending mode (described later) or a receiving mode as a facsimile function, it also functions as an offline copier for copying. It is equipped with display sections such as a copy start key, a numeric keypad for setting the number of copies, a stop key, a JAM display, and an out-of-paper display, which are strange to use in various modes (described later).

Next, the operation when using this system in copy mode will be explained. First, when you place the original on the original hopper 1,
The document sensor 30 detects the document, and the microcomputer 350
A signal is input manually to I3 (input port), and size detection (
IT number enters. From microcomputer 35, reader part BK
On the other hand, depending on the position of the document guide plate 29 from the output boats 09 and 010, either the size A signal (A4 in this embodiment) or the size B signal (l34 in the real Mr3ρ11) is output to the line driver 42. The signal is sent to the microcomputer 55 through the line receiver 60. Then, the copy paper is selected through the control line 68. Next, on the operation unit 59, the number of copies is set, although it does not matter whether the document is placed before or after the document is placed. Here, it is assumed that the number of sheets is set to one. Next, when the start key is pressed, the operation unit 59 sends the setting of 1 sheet and the operation of pressing the start key to the microcomputer 55 via the signal line 61, and a start signal for operating the document transport device A and movement reading A signal obtained by setting the MODE signal to a high level is used as an operation command signal for the line driver 63. Line receiver-4
3 to the microcomputer 35, and the document feeder AFi starts an operation for moving and reading. or,
In the reader part B, the optical system is moved and fixed at point a at the same time as the start key is pressed, and the reader part B enters a reading standby state. Thereafter, an image leading edge signal is sent from the output boat O1 to the reader part B, which is turned on at the same time as the leading edge of the separated and conveyed document passes point a, and turned off at the same time as the trailing edge passes through.

After that, in the reader part B, the image information read by the CCD 45 passes through the information line 64 and is transferred to the A/D converter 46.
converted. This digital belief signal is sampled in synchronization with the original transport speed by a Hata pulling signal 66 that passes through the information line 65, passes through the control section 56, and passes through the 1# signal line 67 to the printer part C's ii! ii image copying 1blJσ11 circuit 57, copying is performed in synchronization with the document conveyance by a control signal 68, and copy sheets 58 are sequentially output. 1.], when the number of copies per sheet is set to 2 or more, line driver 63. The original is sent to the microcomputer 35 through the line receiver 43, and the original transport device A performs an operation for static reading, and the original stops at the original stopping position Ifb.
and sends a stop completion signal to part B of the reader. Thereafter, the reader part B performs a scanning operation by the optical system drive circuit 49, reads one original image by the CCD 45, and performs the scanning operation until the set number of copies are completed in the same manner as described above, and then cares for the copy paper 58. .

When the copying operation for the set number of sheets is completed, the original is ejected and the next original is transported to the stop position B at the same time, and the original is read repeatedly until there are no more originals on the tray L. Perform the action.

Ig L s J) A 4'H length in the feed direction exceeds the length of the standard rectangle size in the cross direction, i.e. The operation for long documents will be explained. in this case,
The leading edge detection sensor 18 detects that it is a long document, and at the time when it passes the length 75z of the specified size in the feeding direction, which was first sent to the reader part B, and the document reading position point a, the above-mentioned 1i is detected.
11i ahead (g is turned off. After that, the image 1#! area that was not read by this document movement reading is stopped at the document stop position, and a stop completion signal is sent to the reader part B.
The reader part B performs the above-described static reading operation of the document and prints out the document on another paper. In this case, the reader part B turns off the start signal when it receives the stop completion signal, and then turns off the start signal 11 times when the stationary reading of the document during printout operation on the other copy paper is completed. #4 Send to transport device A. In addition, stopping at the original 4i-stop position point is performed by stopping at a position where the information printed out by movement reading at point a and the printed out (tV report) at point b partially overlap. .

In addition, the document static reading operation is performed one after another in accordance with the length of the long sheet one height detected by the tip sensor 18, and one after another, one after another, one after another! Next, we will explain the sending mode operation of the facsimile.Select and set the sending mode on the operation section 59 and press the start button.Then, the document moving and reading operation in the copy mode described above will start. A signal similar to the above is sent from the reader part B to the document transport device A, and the document movement and reading operation is started.
The IIIi image information f44 is read by the CCD 45, converted into a digital signal by the converter 46, passed through the information line 69, compressed by the compression processing circuit 47, and sent to the image buffer memory 48 through the information line 70. . In parallel with this storage operation, the image data transmitting circuit 50 of the transmitting/receiving interface D fully determines whether the transmitting/receiving circuit #5150 can be transmitted. When this transmission operation button is pressed, both types of buffer memory 48
If overflow occurs, the overflow (g number) is sent to the control 31S56&C through the signal line 72, and then the MODE signal is turned off to command the document feeder AVc to read the original statically.
Stop the original 1F4 at the position where the first part of the original a is aligned with the original 4t, 4th stop city position re b, and send the stop completion signal to the reader part B.
send to Then, the information stored in the image buffer memory 48 that has been read halfway through the original by the original moving process is erased via the signal line 72, and is transmitted via the line 51. When the image buffer memory 48 becomes empty to some extent, it performs a static reading operation of the original document and continues the operation of storing information in the image buffer memory 48. At this time, the document feeder fiA
Then, the original ear 4 static reading is performed for the original at the time of overflow occurrence and the next original, and the first Harago moving gun capture is performed for the next original.
1. This is because at the time when the original at the time of overflow is stopped at the original stop position 1tjbK, the next original has passed the movement reading position point a.

Further, even in the case of a long document during the transmission mode operation, it is possible to perform the same operation as the operation corresponding to the long document f1 in the copy mode operation.

Figure 3 is a timing chart when two A4 originals are loaded in copy mode and the number of sheets is set to 1. Figure 4 is a timing chart when 134 originals are loaded.
The figure is a timing chart when two A4 originals are loaded and the number of sheets is set to 2 in copy mode. Figure 6 is an A4 document.
When loading one long original, set the number of sheets to 1 in the cover mode.
FIG. 7 is a timing chart when two A4 originals are placed and the number of sheets is set to one in the transmission mode. Also, Figures 8 to 13
1\lii Jg in FIG. 2, l chip microcomputer 35 installed in the document transport control circuit 62
This is a flowchart of a program executed by the l-chip microcomputer 55 incorporated in the control unit 56 of the reader part B, and enables the timing charts of FIGS. 31 to 7 to be executed.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 8 to 13. FIG. 8 is a flowchart of the microcomputer 55 that enables the 111 turn as shown in the timing charts of FIG. 3 and FIG. First, in s'rgp i, the start signal is turned on, and it is determined whether the set number of sheets is "1f".

If it is 1', proceed to s'rgp 2. Also, “2”
If the woman is above, proceed to 8TBP 5. STgP 2
Now, in order to cause the document transport device A to perform a moving reading operation, the MODE signal is turned on and the optical system is moved to point a. Then, start the printer operation, and the image tip signal becomes O.
Wait for N and STI! 11' Proceed to 3. S'l'
l! l! In P3, the document movement and reading operation and the signal line 68 to a part of the printer (Fig. m1).

A command signal is issued through the printer (FIG. 2) to start printout execution. Continue this process until the image tip signal turns OFF, then use a 0.2 second timer to determine whether the stop completion signal is ON or 01i'F. If it is ON, proceed to step 11. If it is OFF, proceed to the next step. , determine whether the size 8 signal is OFF, and if it is ON, return to the middle of 5T13P 2,
If OFF', proceed to 8'rj6P 4. 8TBP 4
Then, the start signal and MOl)R signal are (JFF'l,
The operation is complete.

Also, if the set number of sheets is ``2'' or more, send a command to the printer in the same way with S'rEP 5 to start printout execution (proceed to P 6). Wait for the stop completion signal to point b to turn ON, then turn the start signal ON, PL, if static reading of the original is to be performed, printout is also executed and the start signal is turned ON.
Determine whether the size A signal is OFF or not, ot't! ′
Otherwise, go back to the beginning of Vl"S'mouth 8P 6, and U i again.
” If F, proceed to S i' 112 P and i.

FIG. 9 is a flowchart of the microcomputer 35 in which 21λ3(・i'l is enabled as tjf. First, set the original and inertia rCyh S'l'J!3P 7. Then, the size A signal O,N l,, wait for the start signal to turn ON, proceed to the next step, and then M O+) +8
Is the signal ON? ltl + Staring d) Hara, ;61 Execute transportation or Hara IWJ + Purification 1 + No I, Jft14 for only! Determine whether to execute Ili'i transfer. M01) If the g signal is OFF, proceed to Figure 1O, (if JN, start document separation 1/red to execute original 44 movement reading, and proceed to s'rgp8.

In S'l'gP 8, the tip sensor 18 is ON.

That is, when the leading edge of the document reaches the leading edge sensor 18, the microcomputer 35 l also starts the leading edge counter, trailing edge counter, and stop counter set in predetermined areas of AM, and starts counting lock pulses. Next, it is determined whether the value of the tip counter has reached 150.

That is, in this example, the eight document movement reading positions are located 75 points from the tip sensor 18 (FIG. 1). When the leading edge counter value reaches 150, the image leading edge signal is turned ON, and then the trailing edge counter value becomes 744 (A4 vertical 297 x 2 + 1
50) Wait for it to happen. During this time, it is observed whether the start signal turns OFF every pulse count. If OF
If it becomes F', proceed to r/'i in FIG. Next, when the value of the trailing edge counter reaches 744, the image tip signal is turned off and ST
I! Proceed to iP9. For 8Tl-9, tip sensor 1
8 is ON or OFF, and if it is ON, then if it is a long original, proceed to Figure 10, 5TBP l 2, but if it is OFF, then do you want to say the original? -30r7) Determine ON and OFF,
If it is ON, the document is still on the tray L (FIG. 1), so the process returns to the beginning of 5TEP 8 to repeat the above-mentioned operation. Further, if the output of the document sensor 30 is OFF, O8'l'EP proceeds to the STI bow PIO, which is the document ejection flow.
At 10, the size input signal is OF'F' l, the discharge counter is started and its value is 1160' (point a, b
Between points 430X2 + distance from point b to outlet 150X2
), then stop feeding the document for 1eI, and the operation is complete. 35 is a flowchart. First S'l'EP
7 (9th reversal 1) determines static scanning of the original, and STl'3
When proceeding to P11, the original ejecting operation is started, and after waiting for the leading edge sensor 18 to turn ON, a stop counter is started, and the clock pulse is counted, and the process proceeds to 8Tl12.
Hole in. In 8Tgl'12, the value of the stop counter is 1.
010 (a, bfil1430X2 + tip sensor,
Wait for the distance between points a to 75X2), stop the original at point b, and turn on the stop completion 1 flag. Next, wait for the start signal that turns ON when the original static reading is completed, and then turn the stop completion signal OFF L, judge whether the original 44 sensor 30 is ON or OFF.
) iCt tall1t4r,%kaalL7)tes'
Return to rgPl l, S'lEF 11. The document exchange operation consisting of 12 is performed. OFF again
If so, proceed to 8T19P 13 and turn off the size A signal.
l, Start the document ejection operation, start the ejection counter, and check that the value is 300 (from point b, ejection port 150X2)
The flow of the microcomputer 35 f't'-
) is 0 which is possible by executing Fig. 9 24410, and Fig. 11 is A4 as shown in the timing chart of Fig. 6.
There is a flowchart of the microcomputer 55 that enables control in the case of a long document. fR8rsl ノ8'
Run vJLP 1.8Tli3P 2, 8'rHP
When the stop completion signal is ONt at 3, Fig. 11, 5
Proceed to TEP 14. At STgP t 4, the start signal is turned OFF until t, the document is held still and Hf-Z is taken, and the printer C prints out, the start signal is turned ON 1, and the process proceeds to 5TEP 1 5. S'l'
At h+P 15, it is determined whether the size A signal is ON or OFF, and if it is ON, it is 1, which indicates that the good manuscript is to be continued, indicating that the stop is complete. In addition, in the case of 01"F', the start signal and 1"J
Dl)B signal is set to U l'' PL, and the operation is completed.

? FIG. 412 is a flowchart of the microcomputer 55 which has the oJ' function shown in FIG. First, 5TEP l
At point a, the start signal and MOL)E signal are moved to the ONL reading optical system to point a, and the compression processing circuit 47 (xp+'th
>, image) Start up the output memory 48 and image data transmission circuit 50 overnight, put them in standby state, and then S'l'E
Proceed to P.17. In S'l'1jP17, the image tip signal is O.
Wait for N, then start moving and scanning the document.
Proceed to 1B. s'r+! In 3p t s, execution processing such as compression processing, storage in the image f* buffer memory, and image data transmission is performed sequentially, and the mulberry size A signal is o it” F
In other words, it is determined whether the transmitted manuscript has been completed, and O
If it is FF, it is a start signal, and if it is 0, which turns MODI4 signal OFF and the operation is completed, or if it is ON, signal line 72 (Figure 2)
It is determined whether an overflow has occurred through the process, and if an overflow has occurred, the process advances to STIMP19. If it does not occur again, wait for the image tip (fi number) to turn OFF and complete the document movement reading and then proceed to 5T.
Return to EP t7. In S'l'EP l 9, the start signal, Moag (@ number is OIi' F L, the image data of the document read before the overflow occurred is erased, and the JI of the overflow is
It is determined through all signal lines 72 (Fig. 2) that the image buffer memory is filled with the original document, and if it is released, the next step is to move to point b in order to perform static reading of the original document. Wait for the stop completion signal indicating the stop of the original to turn ON, stop the original, start taking, and send the start signal.

MOD E (Proceed to i issue OF FL8TEP 18.

131'l<1 is a flowchart of the microcomputer 35 that enables control as shown in the timing chart of FIG. First of all, let's start with the STI bow P shown in Figure 9.
7 and 5TliiP Execute up to the middle of 8, judge the occurrence of overflow by the start signal turning OFF, and
TEP 20 jump.

At 5TEP 20, turn off the image tip signal, 5TEfP
Proceed to 21 08TEP In 21, wait for the value of the stop counter started in 8 to reach 1010, stop the document, turn on stop completion No. 1a, then wait for the start signal to turn on and stop. Turn off completion signal
F l, Next manuscript length -30 ON.

OFF In other words, it determines that the original to be sent is no longer on tray 1.If not, proceed to 8Tl;
Proceed to TEP 22. s'rEP22 starts the paper discharging operation at 17Fl, waits for the tip sensor 18 to turn on, starts the stop counter, and SIP21
Return to K Repeat the above operation 08TI! 1P23
Then, turn the size A signal OFF +, start the document ejection operation, start the ejection counter, and set '1a to 1160.
Wait until it becomes +14 and stop JJP's movement by 1, and the work will be completed.

Furthermore, in order to operate a B4 size document as shown in the timing chart of FIG. This is possible by changing the count value of the counter.

As explained above, according to this embodiment, the set number of sheets is 1 and the Q document set (for moving the document reading) is 11).
If the JA state is detected, select the original moving reading, and if the condition is not met, that is, the set number of sheets is other than 2, or if the original is not detected at the No Summer frr + set position, select the original 4r4 still reading. By moving multi-copy at once wi
g,lli! There are inconveniences such as only being able to make a single copy when selecting and performing the process, or when exchanging originals when selecting ``LA'' for multiple originals. Inconveniences such as a decrease in copy speed due to 1111 can be prevented.

Father, when an overflow of the image buffer memory occurs while the operation of storing the original image information in buffer memory bottle 1 - is executed, the button controls the switching to static reading of the original. By making this possible, it is possible to eliminate the work of returning the original, eliminate time loss due to the work of returning the original without damaging it, and improve operability.

Also, for a long original, the original deviation jlIlI jftG was switched to static reading in the middle of scanning, and the original deviation was 7ilij, which was outside the specified value.
4'14 Both image information is read by static reading of the original,
On the receiving side, the information is printed out on separate copy paper. Another Hara-Kei stationary flight fls! For example, even for computer-form paper or roll-type originals that cannot be completely copied, the original should be held still at IVf and the position of the document should be moved several times while step-feeding so that overlap copying is performed so that the original track image information is not lost. Stop the original at 117, hold the original still, rotate it 1x1, and print it out on the receiving side's copy paper! By making it possible to control the length of the long side (Ul
It becomes possible to divide the file and send it without having to divide it into two parts.

In the above embodiment, when the image buffer memo overflows, the control is performed from moving the document to reading the document while reading Wr'6; however, the present invention is not limited to this. l1 of
iii. Even if a paper jam occurs due to a problem in the copy paper transport path, the original can be Switch to stationary reading Bj (shoulder in predetermined position 16)
It is also possible to perform control such as holding the copy paper in standby and stopping the original after JAM processing, and in this case, the effect of eliminating the need to return the original can also be obtained.

Further, in this embodiment, the case of A4-84 size documents has been described, but it goes without saying that similar control can be performed for documents of other sizes as well.

Effects As described above, according to the present invention, since the mode for reading the original is selected and controlled according to the state of the storage means for storing read image information, even if an overflow of the storage means occurs, for example, It is possible to prevent document damage and time loss due to document return work, improve operability, and provide a highly reliable document reading device.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the overall configuration of the present invention, Fig. 2 is a block circuit diagram showing the control section of Fig. 1, Figs. 3 to 7 are timing charts of operations in each mode, and Figs. 8 to 13.
The figure is a control flowchart. In the figure, A is a document feeder, B is a reader, C is a printer, D is a transmission/reception interface, 1 is a document tray, 12, 18, 25, 27° 28.50. ! +1 is the sensor, 2o is the endless belt, 26 is the discharge tray,! 15
．． 55 is a microcomputer. Applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) Can operate in the first mode, in which the optical system is fixed and the image information is read while moving the document, and the second mode, in which the image information is read by setting the document in a predetermined position and moving the optical system. a reading means, a storage means for storing the image information read by the reading means, and a storage means for storing the image information read by the reading means; An image reading device comprising a selection means for selecting and controlling a second mode. (2. In claim 1, the image selection means controls switching to the second mode if the storage means overflows during a reading operation in the first mode. reading device.