JPS6276859A - Picture forming method - Google Patents

Abstract

PURPOSE:To decrease damage when a large jolt takes place by detecting the deviation of synchronization and forming the same picture again in response to the detection of the deviation of synchronization at a picture. CONSTITUTION:A synchronizing signal is generated in a normal timing at periods Tn-2, Tn-1, the recording of (n-2)th dot line and the (n-1)th dot line is attained normally and if a jolt takes place on the way of a period Tn, the recording of the (n+1)th dot line is not executed at the next period Tn-2, but the recording of the (n+2)th dot line is recorded. The recording of the (n+1)th dot line is thinned out by using a de-skew circuit 43 to control the dot information corresponding to, e.g., (n+1)th dot line from a buffer memory to be brought to a white dot signal forcibly. At generation of the jolt, since the recording of the next dot line is not executed, a white lie appears on the recording paper and the line is very thin and not almost remarkable on the picture. Thus, damage when the jolt takes place is reduced.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an image forming method applied to an image forming apparatus such as a printer. [Prior Art] Various types of devices for forming images on image receiving members, such as recording paper, have been developed and put into practical use. For example, in a printer, numbers are converted from digital image information.
In order to output images such as characters, there are dot matrix type impact printers, electrostatic printers, radar printers, H, 6 thermal printers, inkjet printers, etc.For example, in electrostatic printers, - Image carrier 1- consisting of a dielectric drum using IA flow electrodes
An electrostatic latent image consisting of a large number of dot lines is formed on the paper, and this is developed with toner to form a -C tri-image, which is then transferred and fixed onto recording paper. ．． 501
It is disclosed in Publication No. 348. 1. This conventional image forming apparatus is shown in FIG. Ionon is applied to the rotatable image carrier drum 11.

[''-Force-type recording \An electrostatic latent image consisting of a large number of dots is formed by the 1 and 2. This latent image is developed with retoner in the developing device W3, and this toner image is transferred to the image carrier 1. It is transferred and fixed at the same time to the recording paper 51- conveyed between the 1 and the pressure transfer rollers 4.The l-1-1 and the latent image remaining on the image bearing drum 1 are The latent image is removed by the static eliminating cleaning device W 6 and is configured to prepare for the formation of a new latent image. [Problems to be Solved by the Invention] In such an image forming apparatus, the image 111 The rotation is detected by a rotary encoder, and the signal from this encoder is sent to the recording head as a reference synchronization signal.
, and controls the timing of image formation. Zunawara,
A reference synchronization signal is generated every time the image holding drum 1 moves one dot line, and this synchronization signal controls the timing of reading the image signal from the buffer memory so that successive dot lines are formed at accurate intervals. ing. However, the rotation of the image carrier drum 1 is not necessarily constant and may vary. In particular, when the pressure transfer roller 4 is pressed against the image bearing drum 1 with a large force of about 1 ton, as shown in FIG. 13, the recording paper 5 enters between them. Because large load fluctuations occur when discharged from the front and between these,
The image carrier drum 1 suffers from uneven rotation. In particular, when the rear end of the recording paper 5 is ejected from between the image carrier drums J, L and the pressure transfer roller 4, the image carrier drum 1 begins to idle due to a sudden decrease in load. The synchronization signal is generated from the rotary encoder at a faster timing than in the normal case.In this way, the line recording start signal is generated at an earlier timing during the formation of a certain line. When this happens, the recorded image becomes extremely disturbed, and this disturbance affects the formation of subsequent dot lines.This kind of image disturbance is called a jolt. The possibility of this occurring increases as the vertical resolution increases by narrowing the dot-in interval.Also, in order to reduce the occurrence of jolt as mentioned above, it is necessary to It is also effective to reduce the impact when the image carrier enters and is ejected between the pressure transfer roller 1 and the pressure transfer roller 4. For this purpose, as shown in the diagrammatic plan view of the image carrier] The axis A-A and the axis of the transfer roller 4 [3-
B at a certain angle θ. With this configuration, the image carrier drum J, 1 and the transfer roller 4
The pressure tangent line is on the line C-C that bisects the center axis A-A of the drum 1 and the center axis B-B of the roller 4, and the recording paper 5 is on the pressure tangent line C-C. In the vertical direction (general feeding force is applied, the sheet will be skewed. When such skew occurs, the image I formed on the recording paper 5-1- will be different from what it would be if there was no such skew. The image I formed on the recording paper is shifted by θ/2 from the image I. In other words, the image area formed on the recording paper is no longer rectangular (square).In order to correct such image distortion, , that is, in order to perform squareness correction, for example, JP-A-56-1160
Japanese Patent No. 64 proposes that a copying machine move the lens laterally or move the scanning means laterally when scanning an original image. When this technique is applied to the image forming apparatus shown in FIG. 13, image distortion is corrected by moving the recording head 2 in the axial direction of the image carrier drum 1 in the same direction as the oblique direction. However, mechanically moving the gutter 2 toward recording requires a complicated and expensive mechanism, and since it is difficult to accurately perform this movement, it is difficult to perform sufficiently accurate correction. -〇- The above-mentioned problem of Jol F, Suff J, and Anes is not only when using one type of ion flow type as a recording head, but also when using Dra1, Maricks printer, electrostatic printer using Recording $1, ]- This also occurs in thermal printers that use throat-shaped thermosensitive elements. In addition, when jolt occurs, the method to reduce its impact is the same.
The patent application No. 11 was filed in Japanese Patent Application No. 109027/1986. However, if a large jolt (3F, ν) is distorted, image distortion cannot be prevented. Therefore, one object of the present invention is to provide an image forming method that can eliminate the above-mentioned conventional drawbacks and reduce damage caused by large jets. [Means and effects for solving the problem] The present invention records an image consisting of a large number of dot lines on a moving image carrier l- in synchronization with the movement, and receives the image formed on the image carrier. In the image forming method for transferring to a member, the synchronization deviation is detected, and in response to the detection of the synchronization deviation in a certain image, the same image is formed 111 degrees. In response to the detection, a display indicating that the JIJI deviation has been detected is displayed in a part of the corresponding image.Furthermore, in response to the detection of the synchronization deviation, a new image receiving member is installed. After the supply of the image forming apparatus is stopped and the ejection of the image receiving member during image formation in the image forming apparatus is completed, the operation of the rudder device is stopped.
The device is placed in a standby state. [Embodiment] FIG. 1 shows the overall configuration of an embodiment of an image forming apparatus according to the present invention. This embodiment is configured as a printer using an ion flow type recording head. A recording head 12 equipped with an ion flow generating device projects an ion flow modulated in accordance with the image signal to be recorded onto a dielectric drum 11 rotating in the direction of the arrow to form an electrostatic charge image. The developing device 13 develops with toner to form a toner image, and this toner image is rotated by the simultaneous movement of the dielectric drum II, which is placed below the recording paper conveyance path. 11-force rolling force The pressure of the roller 14 is used to transfer and fix the image onto the recording paper. Further, in the transfer section (recording paper), l-f- remaining on the dielectric drum 1, l11- without being transferred to the recording paper is removed by a toner removing device 15 equipped with a cleaning blade, and is further removed from the dielectric drum by a static eliminator w16. The static charge on the drum 11-■- is removed and the drum 11 is prepared for the formation of scratches. The recording paper is separated one by one by the roller 19 and conveyed to the transfer section by the paper feed roller 20, where the toner image is transferred and fixed. - The sheets are conveyed by the paper rollers 21, changed to the sheet discharge gate 90, changed the direction of conveyance, passed the conveyance guide 91 by 1ffi, and are sequentially stacked on the single-stage sheet discharge tray 92 by the cola 89. Further, the paper ejection gate 90 is arranged to be able to swing around a fulcrum (not shown) as shown by the broken line, and when it is swung to the state shown by the dotted line, the recording paper is ejected. The conveyance direction is not changed due to the paper game) 0, and the sheets are stacked one after another on the lower paper discharge tray 22F.Pressure transfer l
The cola 14 is pressed against the dielectric drums 1 and 11 with a large pressure of, for example, about 1 ton, by a spring and a cam. Further, the axis of the dielectric drum 11 and the axis of the pressure transfer roller 14 intersect at a certain angle, as described above in FIG. 12. Therefore, the recording paper 17 is conveyed between the dielectric drum 11 and the pressure transfer roller 14 while being stretched. FIG. 2 G11 is a diagrammatic plan view showing the configuration of the ion flow one-type recording head 12. The recording head includes three types of electrodes that are insulated from each other. That is, recording head 1
20 line electrodes 31-1 extending in the axial direction of
, 31-2...31-20, and 124 wooden finger electrodes 3+- arranged diagonally across these line electrodes and having small holes in the portions facing the line electrodes.
1, 31-2, . . . 32-124, and a screen electrode 33 arranged above these finger electrodes and having a small hole 33a at a position opposite to the small hole formed in the finger electrode. For example, when an electric current [I; is applied between the first line electrode 31-1 and the leftmost finger electrode 32-■, an ion flow is generated at the small hole 32a where these intersect. , l,, an ion current is emitted through the small hole 338 made in the screen electrode 33 which is phantom H with this small hole 32a, and the dielectric material 1゛ram lI,1
:, Four dot-shaped static charges are formed. Therefore, the line electrodes 31-1 to 31-20 and the finger 1'
Poles 32-1 to 32-124 will be described below. By selectively energizing the dots, an electrostatic charge image consisting of a large number of dot lines can be formed. FIG. 3 shows the relationship between the ion flow h (projection position) formed on the recording head 12 and the dot pattern formed on the recording paper 17, and the maximum length of the l dot line is 20
124=2480 dots, but the actual image is 24
The number of lines on the screen depends on the length of the recording paper 17, but there are 10 dots per 1 mm.
The structure is such that a dot line other than the original one is formed. The spacing between the small holes in each finger electrode 32, the r/f straw, and the spacing between the line electrodes 31 is equal to a four-dot line. FIG. 4 shows signals applied to the line electrode 31 and finger electrode 32. Line electrode 31
For example, the voltage applied to the peak-to-peak value is 2500
The voltage applied to the finger electrode 32 is a meandering voltage of 200ν. Further, the application time of these voltages was approximately 6 μsec. First, a voltage is applied to the first line electrode 31-1, and a voltage corresponding to the image data of the first dot line [2] is applied to the first to first line electrodes 31-1.
24 finger electrodes 32-1 to 32-124 at the same time. Since each finger electrode is responsible for recording 20 dots when viewed in the line direction, the first dot [・the first dot on the line]. 21st. 41st...246th] Image information for successive times is recorded simultaneously. As mentioned above, one dot line is made up of 2400 dots, but for convenience of explanation, it will be explained here as being made up of 2480 dots. That is, in the case of a black dot, a DC voltage of 200 V is applied to the corresponding finger electrode, and in the case of a white dot, a voltage is applied to the corresponding finger electrode. 2nd line +M3
]-2, an alternating current voltage is applied to the finger electrode 32.
-1 ~ 321244 Goba No. 51' Soto Line - 2nd
．． A DC voltage is applied corresponding to the image information of the 22nd...2462nd dot. The first dot on this fifth dot line. The 21st...2461st dot+.[t] image has already been recorded on the recording paper in a four-period curve in which the line corresponding to the dot line is facing the first line electrode 31-1. Thereafter, similar operations are performed up to the 20th line electrode 31-20. When applying an AC voltage to the 20th line electrode 31-20, the 20th. Fourth
0...24th (t) A DC voltage is applied to the finger electrodes 32-1 to 32124 corresponding to the image information of the O-th dot, and all dots on the line of the recording paper corresponding to this 1' dot line are formed. In this way, the time required to scan from the first line electrode 31-1 to the 20th line electrode 31-20 is (6+6.
8) X 20 = 256 μsec. Next, the above-described operation is repeated again after a time of 254/I seconds. Therefore 1
The period T is 256+254=510 seconds, and during this period the recording paper 17 travels downward by one dot line as shown by the arrow in FIG. Therefore】The time it takes for the dot line to be completely formed is 5
10 x 77 = 39.270 v seconds. In the next period 'F, an alternating current voltage is applied to the first line electrode 31-1, and the line electrodes 31-1 and 2461-th dots are 1 to 124th finger electrodes 32-1 to 32-124
A DC voltage is selectively applied to the Next, the second line electrode 3
1-2, an AC voltage is applied to the finger electrodes 32-1 to 32-3.
2-124 has the second dot on the fourth dot line. 22nd...
- Apply a DC voltage according to the image data of the 2462nd dot. After that, similar recording was performed, and the 20th line electrode 3
]-20, a DC voltage is applied to the finger electrodes 32.1 to 32-20 in accordance with the image information of the 20th, 41st, . . . 2480th dots on the dot line. This completes the recording of the 76th dot line. In this way, an image consisting of a large number of dot lines can be formed by repeating the sequential operations. In an image forming apparatus using such a recording head, a batza memory consisting of a random access memory is provided in front of the recording head, and image information is temporarily written 1, and subsequent signals are stored in the image forming apparatus. Drives the recording head. The read timing from this buffer memory is made to be the same as the rotation of the dielectric 1°Ul, 11,
The same amount of signal is generated when the dielectric drum 11 moves by one dot line. For this purpose, the dielectric drum 11 is provided with a rotary encoder from which a synchronization signal is generated. As described above, when the load on the dielectric drum 11 is suddenly reduced, the dielectric drum becomes idle, and the synchronization signal is generated from the encoder at an early timing. In this example, when such a jolt occurs, it is corrected by thinning out one dot line. FIG. 5 is a block diagram showing the overall configuration of the image information processing section of the two image forming devices W. A code signal from an image data generating device 4+ such as a computer or the like is supplied to a character generator 42, which generates a video signal (No. 8) corresponding to a desired character. A buffer memory for at least one dot line is provided, and a video signal for 11 lines is supplied from the buffer memory to the deskew circuit 43. Each deskew circuit 43 is provided with a buffer memory consisting of rung 1 and access memory. Data for 77 consecutive dot lines, in this example 80 dot lines, is stored, and the dot signals read from the data are supplied to the print head driver 44 to drive the print head 12. 42, a controller 45 is connected to the deskew circuit 43 and the recording head driver 44,
Control these. Furthermore, a rotary encoder 46 is provided to detect the amount of rotation of the dielectric drum 11, and the amount of rotation is generated from this. The %J synchronization signal is supplied to the deskew circuit 45. The controller 10-45 controls writing and continuous output of the buffer memory provided in the deskew circuit 43. As described in FIG. 4, one operation period 'r is 510 μsec, and during normal operation, the encoder 461t generates a synchronizing signal at this timing, and during this period 'r, the dielectric drum 1
1 is 1 dot line pitch.Move L1. FIG. 6(a) shows the timing of the synchronization signal and the recording operation. During periods T, . Next, if a jolt occurs in the middle of period 'I'', the n dot line is recorded as is, but in the next period 'F,,+2, the (r+-11) dot line is not recorded, and (n Recording of (-2) dot lines is performed.The recording of (n + 1) dot lines is thinned out in this way, for example, when reading dot information corresponding to (n + 1) dot lines from the buffer memory.
Deskew circuit 43 to forcibly become the own dot signal
Control with. In this example, when a jolt occurs, the next dot line is not recorded, so a white line appears on 1 unit of recording paper, but this line is so thin that it is hardly noticeable on the image. Further, since the subsequent one sotline is recorded normally, the influence of jolt appears only in the thinned out portion, and the image quality is not impaired. Furthermore, T... , during the dot line period consisting of two or more -I
- A large-scale jolt is occurring in response to the synchronization signal. In this case, the jolt detection section 81 shown in FIG. 10 regards it as impossible to correct the jolt, and generates an error signal. The error signal is sent to the controller 45 of FIG. 5, and the controller 45 further sends the occurrence of the error and on which page the error occurred to the character generator 42, which stores the information. At this time, the actual image is significantly distorted and becomes noticeable in the image. Therefore, the character generator 42 stops transmitting the video signal to the deskew circuit 43 at that point. Further, the deskew circuit 43 also functions to inhibit the recording head driver 44 from driving the head 12. As a result, image formation is stopped at the time when an error occurs, and even if the next synchronization signal is input manually, the image forming operation is not performed until the next image receiving member reaches the image forming area. FIG. 6(b) is a timing diagram of the image forming operation for each image receiving member. In T, I-2, T, ., normal image forming operation is performed, but in To, the 2nd large-scale -18= Jolt is generated 11 times, and the image (m) is formed 11 times in the middle. Then, when the next image receiving section (O reaches the image forming area), the special number of the image (m) is sent from the controller 45 to the special number of the image (m) from the controller 45.
I received what was prescribed and am at record 11', so here is the image (m)
Send out the bidet 4 signal again from the desk. The circuit 43 receives this and starts transmitting a signal for driving the recording pin 1'. , 2 Ushi 7 and 1゛1' and later 1
tIl usual m, rn) river m +, 2. ...and an image is formed. In the case of large-scale jolts like this, by performing a sequence to re-form the corresponding image, the distorted image will not be lost in an unrecognizable state, and will remain as a complete image. For this reason, the character generator 42 in FIG.
V) has a buffer memory consisting of a random address memory for storing image data for several pages, for example 80 minutes in this example. Furthermore, at this time, the second roller 45 displays on the operation panel 1 (not shown) that a certain image has been re-formed due to the occurrence of a large-scale jet. In the example of , -, if a large-scale crack is generated in Joll 1, the formation of that image is immediately stopped 1-, but the formation of the corresponding image is continued without stopping 1, and the same image is continued. In a printer using a recording head 12 of 1:1JiL, the axis of the dielectric drum 11 and the pressure transfer roller 1 may be
Since the axis line 4 intersects -U, the recording paper 17 will be skewed (tc ++ ), and the image formed on the recording paper 17 will be distorted if no measures are taken. for example,
When A4 size recording paper 17 is used, as shown in FIG. The size of this deviation corresponds to about 301 sotos. Also, since about 3000 dot lines are formed on F4 size recording paper, every 1001" dot line is recorded as shown in Figure 8. Record only 1 dot 1N21
Squareness correction can be performed by shifting the image forming position at - to the left in the same direction as the deviation of the recording paper. Such a shift can be realized by shifting the timing at which image information is loaded into the buffer memory in the deskew circuit 43 by 1 F nodal every 100 dot lines. For this purpose, the deskew circuit 43 is provided with a 1-line counter to count the number of ton lines to B1, and the controller 45 is provided with a programmable 1-line counter, which compares the amount of distortion of the image with the above i4i. , and set its initial value (30 in the example described above). Also, every time the dot line counter counts 100F dot lines, the deskew circuit 4;
A signal is sent to LJNffi to set the contents of the programmable counter in the -1 controller to [11]. The content of this programmer file is supplied to the deskew circuit 43, and the information is sent to the deskew circuit 43. 1) [Circuit 4 for deskewing image signals supplied from the recharacter generator 42]
It controls the timing of writing to a buffer memory consisting of a random access memory installed in 7. If the image on the recording paper 17-L shifts to the right as shown in FIG. It is sufficient to shift the line by one dot to the left for each line. That is, when writing the information of the 1st to 1001'' sotolines, the buffer memory 4 is written as shown in FIG.
Start writing from the recording position 31 of 3a and write to the second
If you want to store the data of the 24001' node up to the 430th position and write the information of the 101st to 200th tont line, the data will be stored from the 30th storage position to the 24th position as shown in Figure 9B.
Write to memory location 29. Similarly below, 1
The writing start position is shifted by one dot for every 00 tosotline. On the other hand, when reading from the buffer memory 43a, the data is always read from the storage position at the first address, and the read dot image signal is supplied to the recording head driver 44. With this configuration i'), the image forming device on the recording head 12 is shifted every 100 dot lines, and as shown in FIG. It turns out. As mentioned above, one dot line is made up of 2400 dots, so the buffer memory 43a requires a capacity of 2430 dos 1·IJL per 1 dot line, but in this example, it has a capacity of 241,101 soI. do. -1- In the example mentioned above, 14i'! Recording head 121. -4 image formation a) “! Place is l] - throat shift + t,,
Since there is no shift of 1, - on the image, it is small, but if it is necessary to completely eliminate the influence of this shift or increase the shift IM, I will explain next. In other words, all dots in the dot line (white dots) are detected and shift 1 is performed at the white dot line position. When a black dot is included, the corresponding driver [shift in the line] may be prohibited. Fig. 10 shows the configuration of the deskew circuit 43 that performs both the Joll 1 Sleeve IF and squareness correction as described above. 2 is a block diagram. When the dot image signal from the character generator 42 is in the 8-pin parallel format, for example, it is supplied via a discrete interface 51. Also, when the dot image signal is in the serial format, 1 serial ink-face 52 converts the image information into an 8-bit parallel format.The image information input in this way is first checked for parity by a parity check section 53, and if an error is detected, an error signal is sent. is output and the operation of the entire printer is stopped.After the parity check, the image information is continuously written to the controller 5.
The data is supplied to the dot data buffer 56 through a gate 55 which is controlled to be open during writing and closed during reading by the gate 4. This Ha Nofa 56 is capable of storing 4M data for 16 dosotlines. On the other hand, the parity-checked horizontal image signal is also supplied to a white line detection unit 57 that detects whether the entire one line is a white dot. If detected, this signal is sent to the write/read controller 5.
Gate 58 whose opening and closing are controlled in the same manner as gate 55 by
The data is then stored at the address position of the dot line on the squareness display sofa 59. Write/read controller [-roller 54 is write address generator 6
0 and read address l-[*s generator 61 to generate a write address and a subsequent attos, respectively. These addresses are supplied to buffers 56 and 59 via multiplexer 62, and writing and subsequent output are performed in these buffers. The dot image signal successively outputted from the dot data buffer 56 is supplied to an 8-bit/4-bit converter 64 via a latch 63. On the other hand, Square? A signal indicating whether or not the bit line is a white line is simultaneously outputted from the Nesbin buffer 59 and supplied to the square error correction section 66 via the latch 65. This squareness correction section 66 has one! - during the dot line counting the number of 1' sotlines as described above)
A syntaro 7 and a squareness:2 controller 68 having a programmable counter are provided. The programmable counter has image formation (r) on the recording head from outside.
Initial shift amount of /position, -L In the example mentioned above, it is possible to set 30 degrees. Further, a rotary encoder 69 and a reference oscillator 70 are provided for detecting the rotation M of the dielectric drum 11, and the outputs of these encoders and the oscillator are supplied to a control signal generator 71 to generate a reference synchronization signal. The control signal generator 71 sends a signal to a dot line counter 67 provided in the squareness correction section 66 each time the recording paper 17 travels along a dot line together with the dielectric drum 11, and the counter 67 counts this. This power 1
When Rintaro 7 counts 100 lines, it sends a squareness request signal to controller 45, and controller 4
Subtract the cod J value on the counter of 5 from 1-I J and LJ,
The value is launched in the squareness controller 68. 10] Assuming that the tosotline is the own line, the nearness controller 68 latches the new correction amount sent from the controller 45, and its content is "2".
9”. At this time, squareness controller GB
outputs a signal that shifts the image forming start position of the recording head 121- from the 31F soto position to the 30 dot position. This signal is supplied to the 8-bit to 4-bit converter 64 mentioned above, and its operation timing is controlled. The output dot signals of the 8-bit to 4-bit converter 64 are sent to buffer memories 72 and 7, each consisting of a random access memory capable of storing information for 40 dot lines.
3. In order to control the writing and successive output of driver data to the buffer memories 72 and 73, a synchronization signal synchronized with the rotation of the driver 1' ram 11 is sent from the control signal generator '71 to the write 72 and 73. . is supplied to an address generator 74 and a read address generator 75. The addresses from these write and subsequent address generators 74 and 75 are supplied to a direct and subsequent address decoder 76.
and multiplexed signal 77 are supplied to buffer memories 72 and 73. In addition, the buffer memory 72
Alternatively, the signals successively output from 73 are supplied to a modulator 79 via a multiplexer 78, and finger electrodes 32-1 to 32-1 are supplied to a modulator 79.
32-124. Bathosoa memo IJ72 consisting of random access memory
and 73 can each store image signals for 40 dot lines, but the signals of odd lines are stored in memory 7.
The even-numbered line No. 18 is stored in the memory 73, and the signals of successive dot lines are stored in the intersection z7. Of course, the data of one even-numbered 1-node line is written to the buffer memory IJ 73 in the cycle in which the odd-numbered [J tontoline is being recorded in the information successively received from the buffer memory 72. Furthermore, in order to perform Joll 1 correction, Joll[・Correction unit 80
will be established. The month/month/correction section is provided with a jigold detection section 81, to which the synchronization signal of the rotary encoder 69 and the output signal (signal indicating whether or not printing is in progress) of the control signal generator 7I are supplied. As described above, when the jolt 1 correction section 80 detects that the periodic signal of the next dot line is input during the recording period of the 11th dot line, it determines that jolt has occurred, and sends a signal to the correction control signal generator 82. This correction control signal generator 1-4- is a write address generator 7.
4 and subsequent address generation 1ii75, a signal is sent to the control signal generator 71 to generate a 71-゛ address so as to thin out the 1 dot line. As a result, the next synchronization signal causes the (n-1-2)th dot line stored in the same buffer memory as the n dot line, for example, the buffer memory 72 that stores odd-numbered dot lines, to be stored. The subsequent address is changed so that the information is not read. Therefore, this buffer memory 72 is read out in two consecutive cycles, and the other buffer memory U73 is written in two consecutive cycles. Since the write/read timings in the buffer memories 72 and 73 are shifted in this way, the Joll 1 complementary IE section 80 is controlled by the control signal generator 71.
to change the write and successive timing. As described above, when a jolt is detected, one dot line is thinned out, so that no new data is written, and the buffer memory 72 or 73 stores old data as it is. Therefore, the data of the dot line whose writing was skipped is stored in the buffer memory. It is necessary to memorize the address corresponding to the at L node of the pig dot line. For this purpose, the output of the jolt detection section 81 is supplied to the jolt occurrence flag generation section 83, and the output of the jolt occurrence flag generation section 83 is set to "print this data as #1. Generate a flag value of 0" meaning 1. 71 through the gate 84 consisting of the tri-stay 1 buffer? The flag is supplied to a jolt occurrence flag storage section 85 consisting of AM and is configured to be stored therein. In a normal state where no jolt occurs, the flag value "1" generated by the jolt occurrence flag generation section 83 is recorded. Further, a write or successive address is supplied to the jolt occurrence flag storage section 85 from a write address generator 74 and a successive address generator 75 via a multiplexer 86 . Thereafter, correction control signal generator 82 outputs gate 84 . Sends a signal to the Zirilt occurrence flag storage section 85 and multiplexer 86,
The multiplexer 86 is switched to select the next address from the write address, the jolt occurrence flag storage section 85 is switched to read mode, and the gate 84 is switched to a high impedance state. In this way, it is monitored whether the data sent to the recording head driver should be printed (flag value "1") or should not be printed (flag value "0"), and the result is sent to the driver enable generator 87. do. Next, the squareness correction will be explained. As described above, the dot image signal from the character generator 42 is supplied to the own line detection section 57, and it is detected whether or not the entire one ton line is a white dot. For convenience of explanation, it is assumed that the 101st and 102nd tont lines include black dots, and the 103rd tont line does not include black dots and is a white dot line. , 1: ili t, just the formation of the first 100 dot lines 11 bodies 2I, buffer memory 72
The operation of the 8-bit to 4-bit 1 converter 64 is controlled by the signal from the squareness corrector 66 so that the l'sol Lt number 4a is written from the 31st storage location in and 73. Next, in the 101st line IN group, the storage start position in the buffer memories 72 and 73 would normally be shifted to the 30th storage position, but as mentioned above, the 10th
Since the 1st and 102nd dot lines are black dot lines, the state in which data is written from the 31st storage position is maintained up to the 102nd dot line. Next, when a signal indicating that the 103rd dot line is the own line is supplied from the squareness bias 1 buffer 59 to the squareness correction unit 6G via the latch 65, the squareness controller 68 of the squareness correction unit 6[i] r1. with the controller 45. + ta is subtracted r29. A correction value I is launched, and the dot signals from the 103rd dot line onwards are transferred from the 30th line 1a position to the buffer memory 72.7.
3 will be written. On the other hand, the tonto line counter 67LJ of the square error correction section 66 is reset when 100 tonto lines have been calculated, and starts counting again from the 101st tonto line. Therefore, when the 200th dot line is counted, a signal is output again, and if the 201st dot line is the own line, the contents of the programmable counter will be "r-28", and the dot signals from the 201st dot line onwards are stored in the buffer memories 72 and 73. On the other hand, if the 201st dot line includes a black dot, the writing start position in the buffer memories 72 and 73 is not shifted, and data is written from the 30th storage position. written. This state continues until the next white dot line is detected, and when the white dot line is detected, the subsequent dot line No. I3 is stored in the second buffer memory 72 and 73.
The write timing is shifted so that the data is written from the 9th memory location. In this example, the shift is delayed until the current dot line is detected, but since the number of dot lines per character line is 30 to 40, the shift position will not be significantly delayed. On the other hand, since the image forming position at recording node 1 is shifted at the position of the white dot line in this way, it is generally shifted at the margin between character lines. Now, the characters themselves are not distorted by the shift, and the recorded image! At -9, shift 1- becomes completely inconspicuous, and a high-quality image can be obtained. The present invention is not limited to the embodiments described above, and various modifications are possible. 1- In the embodiment described above, the dot recording element is shifted not only in the axial direction of the dielectric drum but also in the running direction of the drum as the recording heel 1'. It is also possible to use recording heads arranged in a row. In such a case, the capacity of the buffer memory becomes smaller and the circuit configuration becomes simpler. In addition, in the two-sided practical example, an ion flow recording head was used, but a dot-shaped thermal recording head, a static recording head using recording paper, an inkjet printer with a large number of inkjet nozzles arranged, a laser printer, etc. It can be applied in exactly the same way to the case where a recording head of another type is used.Furthermore, in the embodiment described in -, Jolt correction and squareness correction are performed, but either of the above two types of correction, Alternatively, the present invention may be applied to an apparatus that does not perform both.Also, in the above embodiment, the page on which large-scale jam 1 has occurred is ejected to the same paper ejection tray, but only that page is ejected to the other paper ejection tray. For example, in FIG. 1, it is assumed that a large-scale jolt occurs while recording sheets are being sequentially stacked on the single-stage paper ejection tray 92. At this time, the paper ejection case 190 is at the position indicated by the solid line. -1- As described above, the image is again formed on the next recording paper after the recording paper on which the image has been transferred and fixed at that time. Here, the controller 45 moves the paper ejection game I.90 to the position indicated by the broken line when the leading edge of the former recording paper, whose image is distorted due to large-scale jitter, passes the lower paper ejection roller 21. Control the movement. As a result, the corresponding recording paper is discharged to the lower tJI paper tray, and the trailing edge of the recording paper touches the lower paper output loaf 21.
m, the next recording paper arrives at the paper ejection gate 90.
By returning the recording paper to the solid line II device, subsequent recording paper is discharged to the upper stage II paper tray 92 in the same way as the monthly/generated Ail. Here, after the completion of the φ11 printing of the C1 device, the recording paper stacked on the paper tray 92.1 in the first stage becomes a series of documents in which all the desired images are recorded at the initial stage. There is. Then, ζ, only the recording paper on which the image disturbed by the jolt is formed is discharged to the tray 22. By configuring the G apparatus in this manner, the operator does not have to take the trouble of removing the recording paper on which the disturbed image is formed. (2) In the L up/down mode, there are two paper ejection trays, an upper and a lower tray, but if we assume, for example, a unit W (not shown) equipped with a sorter, the recording paper with a disturbed image formed by the jolt Various examples can be considered, such as a similar effect can be obtained by discharging the liquid into an unused bin. Next, a second embodiment will be explained. The outline of the device is the same as in the first embodiment. FIG. 11 is a block diagram showing the overall configuration of the signal processing section of the second embodiment. The character generator 42 has an internal character generator for Jigotsuki.
It has a call display image generation section 88, and when a large scale jolt occurs as described in the first embodiment, it generates a jolt display image and transmits it to the deskew circuit 43 in the form of a video signal. That is, the reference synchronization signal generated based on the signal from the rotary encoder 69 in FIG. ．． Jolt is corrected by the jolt occurrence flag generating section 83 and the like as described in the description of the first embodiment. However, when a large-scale jolt occurs, the jolt detection section 81 generates an error signal and sends it to the controller 45 in FIG. The controller 45 transmits to the character generator 42 the information on which image receiving member the jolt has occurred.In response, the jort error display image in the character generator 42 Generation section 8
8 generates an image signal indicating that a Joll I error has occurred corresponding to a certain portion of the corresponding image receiving member, sends it as a video signal to the deskew circuit 43, and passes through the normal process to the image receiving portion +A-)::. form its image. FIG. 12 is an example of an image receiving member on which an error display image for the month of the month is formed. An image is always formed on the front 21' of the image receiving member, but a jolt occurs on the way and the image is significantly disturbed. At this time, image formation is stopped as in the first embodiment. By executing the sequence of this example, the Jolt error display image i (JO
l, T I'! IIRORi REMOVE Tllll
5 PAGE) is formed. According to the first embodiment, since the image of the same page is subsequently formed on the next image receiving member, after the image formation is completed, the image receiving unit 10 where the jolt has occurred is moved according to the jort error display image. Once extracted, you will have the set of documents you originally wanted. In this example, as described in the first embodiment, two types of complement i1E
It may be implemented in an apparatus that does not perform either or both. The present invention may also be implemented in an apparatus that does not stop image formation on an image receiving member in which an error has occurred. Next, a third embodiment will be described. If a large-scale jolt occurs as described above, the jolt [
The detection unit 8I similarly sends an error signal to the controller 45, and the controller 45 sends an error signal to the character generator 42.
Send information that the error occurred and in which image the error occurred. In response to this, the character generator 42
stops sending out the video signal, and the controller 1-roller 45 further notifies the operator of the apparatus of the occurrence of a short error using an audio generator, display means, etc. included in the operation panel (not shown) and requests the supply of new recording paper. After the recording paper in the apparatus is ejected, the operation of the apparatus is stopped and the apparatus is placed in a standby state. This control is performed by sequence control of the controller 45. That is, this sequence control includes at least the following series of steps. a step of detecting whether or not large-scale jolt has occurred; a step of displaying that large-scale jolt has occurred; a step of stopping the supply of new paper when large-scale jolt has occurred; The steps include a step of ejecting the recording paper, and a step of stopping the operation of the apparatus and placing the apparatus in a standby state. The operator should carry out the processing when a jolt error occurs, for example, after removing the recording paper on which a disturbed image has been formed due to the occurrence of the jolt error from the ejected recording paper, according to the instructions displayed on the screen, and then starting the image forming operation. Performs key operation processing. In response, the device resumes the image forming operation. The character generator 42 receives and remembers in which image the jolt error occurred, as described in section 11, and therefore generates a video signal from that image. As a result, after restarting, the corresponding image can be obtained from the recording paper on which it was formed, and together with the one before stopping, the series of documents desired at the beginning can be obtained. Although it has different types of processing sequences, it is implemented in such a way that multiple types of processing sequences can be performed in a sub-equipment7. [Effects of the Invention] As described above, according to the image forming method of the present invention, a certain processing sequence can be selected.
It is possible to provide an image forming method that can reduce damage when jolt occurs due to running fluctuations of an image carrier drum during image formation.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the image forming apparatus of the present invention, FIG. 2 is a diagram showing the configuration of the recording head, and FIG. 3 is a waveform diagram showing signals applied to the recording head. , FIG. 4 is a diagram showing the relationship between the print position of the print head and the print pattern on the print paper, FIG. a) and (b) are signal waveform diagrams for explaining the operation, Figure 7 is a line diagram showing the deviation of the image between the recording paper and the paper, and Figure 8 shows the image corrected for squareness. Diagrams - Figures 9A and I3 are diagrams for explaining the operation of shifting the image forming position in the recording head 1=, and Figure 1O shows the circuit configuration of the portion that performs correction of the roller 1 according to the present invention. Block diagram: Figure 11 is a block diagram showing the overall configuration of the signal processing unit for forming the Jolt error display image; Figure 12 is a diagram showing the image receiving member on which the Jolt error display image is formed; FIG. 14 is a diagram illustrating the configuration of an example of a conventional image forming apparatus. 11... Dielectric drum 12... Recording head 1
3... Developing device 14... Pressure transfer roller 17... Recording paper 31-1 to 31-20... Line electrodes 32-1 to 32
-124...Finger electrode 33...Screen electrode Old...Image data generator 42...Character generator 43...Correction Uniso I. 44...To record driver 45...Controller 57... - Own line detection section 64... 8 bit-4 pino 1 converter 66... Squareness correction section 67... Deskew circuit 68... Controller 69... Low reencoder 71... Control signal generation Device 74...Write address generator 75...Continuous address generator 72.73...Buffer memory 80...Jolt correction section 81...Jolt detection section 82...Correction control signal generator

Claims (4)

[Claims] (1) In an image forming method in which an image consisting of a large number of dot lines is recorded on a traveling image carrier in synchronization with the traveling, and the image formed on the image carrier is transferred to an image receiving member, during the formation of a certain image. An image forming method characterized in that, in response to the detection of the synchronization deviation, the image is formed again on the next image receiving member. (2) The formation of an image on the image carrier is temporarily interrupted in response to the detection of the synchronization deviation, and the formation of the image on the image carrier is resumed for the next image receiving member. An image forming method according to claim 1. (3) In response to the detection of the synchronization shift, a display image indicating that the synchronization shift has been detected is formed in a part of the corresponding image. Image forming method. (4) In an image forming method in which an image consisting of a large number of dot lines is recorded on a moving image carrier in synchronization with the movement, and the image formed on the image carrier is transferred to an image receiving member, In response to the detection, the supply of a new image receiving member is stopped, the operation of the device is stopped after the ejection of the image receiving member during image formation in the image forming device is completed, and the device is placed in a standby state. Characteristic image forming method.