KR19990018468A - Printing Machine and Adjusting Time of Photowangju by Color Using It - Google Patents

Abstract

Disclosed are a printing press and a method for adjusting photoperiod according to colors using the same. The printing machine is installed on the photosensitive medium and installed on the transfer path of the image formed by the photoreceptor unit and the developer onto the paper sheet, and an image pickup unit for acquiring image information about the image by incident light and the image information provided by the image pickup unit. And a system control unit for correcting the error amount for the sequential scanning time intervals between the optical scanning units. The method of adjusting the photoperiod timing by color using the printing press firstly sets the scan start interval time corresponding to the sequential scan start of the photorejuvenation units, and is set for each photocopier unit according to the set scan start interval time. Scanning and developing light using an image pattern for error retrieval, acquiring image information developed using a solid-state imaging device, and between the images scanned and developed by each optical scanning unit from the image information. Calculating the separation distance to correct the scanning start interval time for each optical scanning unit, and repeating the optical scanning and developing step at least one or more times according to the modified scanning start interval time to determine the scanning start interval time Go through the steps. According to such an apparatus and method, there is no need to correct data on the interval between photoperiods by the inspector, and the time required for adjusting the intervals of photoperiod is reduced.

Description

Printing Machine and Adjusting Gwangju Period by Color Using It

The present invention relates to a printing press and a method for adjusting the optical scanning angle for each color using the same. Specifically, the optical scanning interval error amount for each color is calculated from information obtained by photographing an image developed by sequentially scanned light for each color. Accordingly, the present invention relates to a printing press that can internally correct the interval between photoperiods and a method for adjusting the photoperiods for each color using the same.

1 is a view showing a general color printing machine.

Referring to the drawings, the reset device 15, which is arranged for each color, is sequentially provided on the circulation trajectory path of the photosensitive belt 14 which is circulated by the three rollers 11, 12 and 13 arranged in a triangle shape. A plurality of optical scanning unit 16, a developing device 17, a drying device 18, and a transfer device 20 are arranged.

Looking at the printing process, first, the optical scanning unit 16 scans the light corresponding to the image input to the photosensitive belt 14 orbiting through the reset device (15). Through this process, the electrostatic latent image is formed on the photosensitive belt 14. After the developer 17 supplies the toner or liquid developer in a solid state to the photosensitive belt 14 having the electrostatic latent image formed thereon to form an image, and is transferred to contact with the photosensitive belt 14 to rotate. The desired image can be printed by passing the sheet 23 between the roller 21 and the pressing roller 22 pressing the same.

In the conventional printing machine capable of performing the printing process as described above, the sequential starting of the optical scanning of each optical scanning unit 16 arranged at a certain distance with respect to the forward speed of the photosensitive belt 14 in a circular motion If it is performed at a time out of the time interval for irradiating light to the same region of the photosensitive belt 14, the distribution of the image developed for each color is out of place, so that an image of a different form from the desired image is produced. Will be made.

In order to prevent such a printing error, the scanning timing interval for each optical scanning unit 16 is adjusted at the beginning of the manufacturing process of a printing press. A look-up table used by the inspector to directly measure and adjust the scanning timing interval for each optical unit 16 in consideration of the normal forward speed of the photosensitive belt during the printing operation according to the error amount calculated accordingly. Hour).

The scanning amount interval adjustment operation for each optical scanning unit 16 is performed by the inspector by directly measuring the error amount and calculating the scanning period interval to be corrected through the image obtained on the printed paper 23, thereby determining the error amount. There is a problem that the time required for error correction work to reduce the amount of errors is high because the possibility of repeating the correction work due to artificial error of the city is high.

The present invention was devised to solve the above problems, and a printer capable of automatically calculating and processing an error amount for each photowangsa unit interval and the correction of the photowangsa period of the photoconductor interval, without the inspector, and the same. The purpose of the present invention is to provide a method for adjusting the photoperiod of each color.

1 is a cross-sectional view showing a conventional printing press,

2 is a block diagram showing a printing press according to the present invention,

3 is a view showing in detail the optical fiber unit of Figure 2;

Explanation of symbols for main parts of the drawings

11, 12, 13, 31, 32, 33: roller 14, 34: photosensitive belt

15, 35: Reset device 16, 50, 60, 70, 80: Gwangju company unit

17, 90, 100, 110, 120: Developer 18, 38: Drying device

20, 40: transfer device 21, 41: transfer roller

22, 42: pressure roller 23, 43: paper

34a: identification pattern 35a, 51, 132, 171: light source

35b: Charger 57, 172: Photodetector

52: rotating face mirror 53: lens unit

54: motor 55: motor drive

56: light source drive drive 130: imaging unit

131: solid state imaging device (CCD) 133: A / D converter

134: memory 140: system control unit

150: lookup table 160: storage device

170: photo interrupter

In order to achieve the above object, the printing machine according to the present invention includes a plurality of photoreceptor units provided for each color to scan light to a photosensitive medium which is circulated, and a plurality of developing electrostatic latent images formed on the photosensitive medium by the photoreceptor unit. And a developing device for transferring the image developed on the photosensitive medium to a sheet of paper and a system control unit for controlling the optical scanning timing and overall system of the optical scanning unit, wherein the paper is transferred from the photosensitive medium. Installed at a predetermined position on the transmission path of the image leading to the image control unit for acquiring image information of the image by incident light to detect an error amount of the sequential scanning time interval between the optical scanning units. An imaging unit is further provided, and the system control unit is the imaging Calculating a sequential scan time errors between the above reasons Gwangju cut amount from the image information provided by the, and the cost to adjust the optical scanning unit interval of each Gwangju reason knitted in accordance with the error amount with its features.

Preferably, the imaging unit receives an incident light and outputs information about the image as an electrical signal, and an A / D converter for converting an analog signal output from the solid-state imaging device into a digital signal. And a memory for storing the digital signal.

In addition, in order to achieve the above object is a method for adjusting the photowangju period for each color of the printing press according to the present invention. Gwangjusa of any one Gwangjusa Unit among the plurality of Gwangjusa Units installed to scan light to the photosensitive medium in a parallel direction at a fixed distance from a fixed position with respect to the cyclically moving photosensitive medium. After the start, setting and storing an injection start interval time corresponding to sequential start of scanning of each of the next light scanning units; I. Scanning light corresponding to an image pattern set for each optical scanning unit on the photosensitive medium according to the scanning start interval time, and performing a phenomenon of electrostatic latent image formed by the scanned light for each color; All. Acquiring image information developed through the step Na using a solid state image pickup device; la. Computing the separation distance between the images scanned and developed by each optical scanning unit from the image information to obtain an error amount between the scanning start interval time for each optical scanning unit set in the provisional step, and according to the error amount Modifying an injection start interval time for each optical unit; hemp. And repeating at least one or more times from the step Na to the step e according to the modified injection start interval time.

Hereinafter, with reference to the accompanying drawings will be described in detail the printing machine according to the present invention and the method for adjusting the optical photoperiod by color using the same.

2 is a block diagram showing a printing machine according to the present invention.

Looking at the printing press according to the present invention with reference to the drawings, it is sequentially on the circular track path of the photosensitive belt 34 which is a photosensitive medium circulating by three rollers 31, 32, 33 arranged in a triangle Paired with the reset device 35, a plurality of optical fiber units 50, 60, 70, 80, and the optical fiber unit 50, 60, 70, 80 provided for each color. A plurality of developing devices 90, 100, 110, 120, a drying device 38, a solid state imaging device (CCD) 131, which is part of the imaging unit 130, and a transfer device 40 are disposed. It is.

The reset device 35 forms an electrostatic latent image corresponding to a new image and a light source 35a for irradiating light locally on the photosensitive belt 34 to remove the latent electrostatic image on the photosensitive belt 34 after completion of the printing process. A charger 35b is provided for charging the area irradiated with light to a potential of a predetermined level for initialization.

The optical fiber units 50, 60, 70 and 80 are controlled by the system controller 140 on the photosensitive belt 34 which circulates through the reset device 35 to provide light corresponding to the image information to be implemented. Scanning to form an electrostatic latent image on the photosensitive belt 34. Each of the four Gwangju yarn units arranged in parallel with each other is controlled to scan the yellow (Y), magenta (M), cyan (C), black (K) color information is controlled by the system controller 140.

The optical fiber unit 50, 60, 70, 80 has the same configuration, one of which is shown in Figure 3, the optical fiber unit 50 is a light source 51, a rotating mirror 52, a motor 54, a lens unit 53, a motor drive 55, and a light source driving drive 56. The motor drive 55 and the light source driving drive 56 are controlled by the system controller 140 to perform the constant speed drive of the rotary mirror 52 and the light emission on / off switching drive of the light source 51.

Reference numeral 57 is a photodetector for detecting a synchronous signal for detecting a part of the scanned light and providing the signal to the system controller 140 as an electrical signal.

Each of the developing devices 90, 100, 110, and 120 supplies a developing solution of a corresponding color to a region where an electrostatic latent image of the photosensitive belt 34 is formed to form an image corresponding to the electrostatic latent image on the photosensitive belt 34. Let's do it.

The drying apparatus 38 is installed in a wet printing press to adsorb a carrier element of a residual liquid that is not involved in image formation in the developer supplied to the photosensitive belt 34 from the developer 90, 100, 110, 120. It is to separate and recover by evaporation.

The transfer device 40 has a transfer roller 41 that contacts and rotates the photosensitive belt 34 and a press roller 42 pressurizing it.

The imaging unit 130, which characterizes the present invention, has a solid-state imaging device 131, an A / D converter 133, and a memory 134.

The solid state image pickup device 131 receives light incident on an image formed on the photosensitive belt 34 or paper 43 as a subject, and outputs information on the image as an electrical signal. The light source 132 provided at an adjacent position of the solid state image pickup device 131 is installed to irradiate light onto the image printing surface of the photosensitive belt 34 or the paper 43, which is the light receiving window surface of the solid state image pickup device 131. This increases the sensitivity of image information acquisition of the solid state image pickup device 131.

The analog signal output from the solid state image pickup device 131 is converted into a digital signal through the A / D converter 133 and then stored in the memory 134. Such data processing of the imaging unit 130 is controlled by the system control unit 140.

The solid state image pickup device 131 looks at the photosensitive belt 34 circulated at a fixed position, but can be installed anywhere on the image transfer path that can acquire information of the image using the developed image as a subject. As shown in the illustrated example, the transfer device 40 may be disposed between the drying device 38 and the transfer device 40 or via the transfer device 40 as indicated by the dotted line so as to capture the transferred image on the paper 43.

The system control unit 140 may include the optical scanning timing and optical scanning information of the optical scanning units 50, 60, 70, and 80, the driving system (not shown) of the photosensitive belt 34, and the developing unit 90, 100. The optical scanning period of each optical scanning unit 50, 60, 70, 80 in connection with the features of the present invention as controlling the apparatus and the like by the set print job flow (110, 120) and the like. Is calculated by reading the image information stored in the memory 134 of the imaging unit 130 and recalculating the optical scanning interval time according to the error amount. At this time, the inspection image pattern is stored in the memory device 160.

The lookup table 150 stores data about the sequential scanning time intervals between the optical scanning units 50, 60, 70, and 80, and the scanning time intervals redefined by the system controller 140. It is possible to update with time data.

The porter interrupter sensor 170 provided between the reset device 35 and the first optical scanning unit 50 that is to scan yellow color information has a light source 171 and a photodetector 172 for generating page synchronization signals. When the identification pattern 34a formed on the photosensitive belt 34 enters and interferes with the incident of the light emitted from the light source 171 to the photodetector 172, a signal corresponding thereto is provided to the system controller 140. . The identification pattern 34a is shaped to have a material that blocks or guides the light emitted from the light source 171 to the photodetector 172 or a structure corresponding thereto.

Hereinafter, a description will be given of a method for compensating photoluminescence timing for each color using a printing machine having such a configuration.

First, in the first step (A. step), the first optical scanning unit for scanning a yellow color of the four optical scanning units 50, 60, 70, and 80 of the four optical scanning units in the lookup table 150 is first. After the start of the optical scanning of 50, the scanning start interval time corresponding to the sequential optical scanning of each of the following optical scanning units 60, 70, and 80 is set. The scanning start interval time is stored based on a theoretical value calculated in relation to the moving speed of the photosensitive belt 34 and the rotating speed of the rotating mirror 52, which are set according to the driving information of the designed printer. In the illustrated application example, the scan interval t1 corresponding to the waiting time from the start of the optical scanning of the first light scanning unit 50 to the light synchronization start time based on the page synchronizing signal generation time of the photo interrupter 170, and The scan intervals t2, t3, and t4 corresponding to the time until the start of optical scanning of the remaining second to fourth light scanning units are stored in the lookup table 150 based on the page synchronization signal generation time.

In the next step (b. Step), the system controller 140 makes a reference to the page synchronization signal generation time to based on the scan intervals t1 (t2) (t3) and t4 stored in the lookup table 150. The light scanning of the first light scanning unit 50 is started after the set scanning interval time t1 according to the controlled image pattern stored in the memory device 160, and the electrostatic latent image formed by the scanned light has a yellow color. The development of the developing unit 90 by the developing solution forms an image line Y of yellow color on the photosensitive belt 34. The image pattern for retrieval stored in the storage device is applied as an example when the developed image is set to be a line.

Magenta color image line (M) is formed by developing the photosensitive belt (34) to be continuously advanced by the next scanning interval time by the optical scanning of the second light scanning unit (60) and the magenta developer of the developing device (100). In the same manner, through the third to fourth light scanning units 70 and 80 and the developing devices 110 and 120, the cyan image line C and the black image line K are respectively exposed. It forms in 34.

When the image lines Y (M) (C) (K) for each color coincide with each other, the interval between the image lines (Y) (M) (C) (K) for each color is set when the coincidence time is set. Distance is the error calculation standard. As another case, when the image lines Y (M) (C) (K) for each color are spaced apart by the set distance, the measurement distance difference with respect to the set distance is an error amount calculation criterion. In calculating the error amount, the yellow image line Y resulting from the first optical scanning unit 50 scanning yellow color information becomes a reference line, and the remaining colors are referenced based on the yellow image line Y. The distance difference between the image lines M, C and K is calculated.

Subsequently (C. step) through the four optical fiber unit 50, 60, 70, 80 and the developer 90, 100, 110, 120 by color formed on the photosensitive belt 34 The image lines Y, M, C, and K become subjects, and the solid state image pickup device 131 obtains image information on the image lines Y, M, C, and K. As shown in FIG. That is, the analog signal due to the charge variation input from the solid state image pickup device 131 by the pixel unit is converted into a digital signal and then stored in the memory 134 to store the image line (Y) (M) (C) (K) information. The collection is complete.

In a subsequent step (D. step), the system controller 140 reads the digital signal stored in the memory 134 to calculate the separation distance between the image lines Y, M, C, and K for each color. The scan amount of each scan start interval for each optical scanning unit (50), 60, 70, and 80 initially set is obtained, and the scan start interval time for each light scanning unit adjusted according to the error amount is obtained. The data is updated and stored in the lookup table 150.

Lastly (e. Step) image lines Y for each color (Y) (M) (C) (by the search image pattern stored in the storage device 160 according to the scanning start interval time updated and stored in the lookup table 150). K) is formed on the photosensitive belt 34, and the image is taken and the separation distance between each image line (Y), (M), (C) and (K) is adjusted with no error amount until the scanning start interval time is correct. The printing process (b. Step to d. Step) following the optical scanning, developing, and imaging steps is repeated at least once.

By repeating such a printing process, the synchronization of the intervals between the optical scanning intervals of the optical scanning unit 50, 60, 70, and 80 for each color is automatically adjusted, thereby eliminating the need for an additional optical adjustment by the inspector. .

As described above, according to the method of adjusting the optical scanning time by color of the printing machine and the printing machine using the same according to the present invention, a plurality of optical scanning unit installed to scan light according to the color-specific data in parallel directions at a certain distance Since the Gwangju period is automatically searched and adjusted internally, there is no need to modify the Gwangju period interval data by the inspector, and the time required for adjusting the Gwangju period is reduced.

Claims (10)

Feeding a plurality of optical scanning unit for each color to scan light to the cyclic photosensitive medium, a plurality of developing unit for developing the electrostatic latent image formed on the photosensitive medium by the optical photosensitive unit, and the image developed on the photosensitive medium In the printing machine having a transfer device for transferring to the printed paper and a system control unit for controlling the optical scanning timing and the overall system of the optical scanning unit, An image of the image developed at the predetermined position on the transmission path of the image from the photosensitive medium to the paper and developed by the incident light to detect an error amount for the sequential scanning time interval between the optical scanning units An imaging unit for acquiring information and providing the information to the system control unit; The system control unit calculates the sequential scanning time error amount between the optical scanning units from the image information provided by the image pickup unit, and adjusts the optical scanning device interval of each optical scanning unit according to the error amount. Featured printing machine. The method of claim 1, wherein the imaging unit A solid state image pickup device configured to receive incident light and output information about the image as an electrical signal; An A / D converter for converting an analog signal output from the solid state image pickup device into a digital signal; And And a memory for storing the digital signal. The printer according to claim 2, wherein the solid state image pickup device is disposed between the developing device and the transfer device so as to capture the image formed on the photosensitive medium. The printer according to claim 3, further comprising a light source arranged to irradiate light on the photosensitive belt so that the light reflected on the photosensitive belt is directed to the light receiving window of the solid state image pickup device. The printer according to claim 2, wherein the solid state image pickup device is arranged to capture the image transferred to the paper. 6. The printer as claimed in claim 5, further comprising a light source arranged to irradiate light onto the sheet on which the image is transferred, so that the light reflected from the sheet is directed to the light receiving window of the solid state image pickup device. The printer as claimed in claim 1, wherein the data for the sequential scanning time intervals between the optical scanning units are stored in a lookup table which can be updated by the system controller. The printing press as claimed in claim 1, wherein four optical unit units are provided to scan yellow, magenta, cyan and black color information, respectively. end. Gwangjusa of any one Gwangjusa Unit among the plurality of Gwangjusa Units installed to scan light to the photosensitive medium in a parallel direction at a fixed distance from a fixed position with respect to the cyclically moving photosensitive medium. After the start, setting and storing an injection start interval time corresponding to sequential start of scanning of each of the next light scanning units; I. Scanning light corresponding to an image pattern set for each optical scanning unit on the photosensitive medium according to the scanning start interval time, and performing a phenomenon of electrostatic latent image formed by the scanned light for each color; All. Acquiring image information developed through the step Na using a solid state imaging device; la. Computing the separation distance between the images scanned and developed by each optical scanning unit from the image information to obtain an error amount between the scanning start interval time for each optical scanning unit set in the provisional step, and according to the error amount Modifying an injection start interval time for each optical unit; hemp. And repeating the at least one step at least one time according to the modified scanning start interval time. The method according to claim 8, wherein four light emitting units are provided to scan yellow, magenta, cyan and black color information, respectively.