JP2009300703A - Printing device - Google Patents

Printing device Download PDF

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Publication number
JP2009300703A
JP2009300703A JP2008154758A JP2008154758A JP2009300703A JP 2009300703 A JP2009300703 A JP 2009300703A JP 2008154758 A JP2008154758 A JP 2008154758A JP 2008154758 A JP2008154758 A JP 2008154758A JP 2009300703 A JP2009300703 A JP 2009300703A
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Japan
Prior art keywords
printing
paper
printed
developing machine
toner
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JP2008154758A
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Japanese (ja)
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Kyoichi Watanabe
経一 渡辺
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Ricoh Co Ltd
株式会社リコー
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Abstract

An object of the present invention is to improve the color reproducibility of front and back when a plurality of printing apparatuses are configured in tandem to perform duplex printing.
A printing output printed by a preceding printing apparatus, for example, a front surface printing output, and a printing output printed by a subsequent printing apparatus, for example, a back surface printing output, are passed through a fixing unit of the latter printing apparatus. Later, the front and back images of the printing paper are measured with sensors, and based on the measurement results, the color reproducibility of the preceding printing device, the succeeding printing device, or both the preceding printing device and the succeeding printing device is optimized. It is characterized in that feedback control is performed to maintain the current.
[Selection] Figure 1

Description

  The present invention relates to a printing apparatus for a system that performs double-sided printing with a plurality of printing apparatuses configured in tandem.
  As systems that perform printing in a tandem configuration of a plurality of printing apparatuses, systems as shown in FIGS. 5 and 6 are known. FIG. 5 is a schematic configuration diagram of a printing apparatus having a cut sheet tandem configuration. The printing apparatus includes a paper feeding device 101, printing devices 102 and 103, and a paper discharge device 104. The paper feeding device 101 includes a plurality of paper feeding trays 111 and 112. The printing paper fed from the paper feeding trays 111 and 112 is fed to the printing apparatus 102 via the paper transport path 181.
  The printing apparatus 102 is equipped with four color developing machines, a Y (yellow) developing machine 113, an M (magenta) developing machine 114, a C (cyan) developing machine 115, and a K (black) developing machine 116. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 117 in an overlapping manner. The toner transferred onto the intermediate transfer belt 117 is transferred onto the printing paper conveyed via the paper conveyance path 182 by the transfer device 118.
  The toner on the printing paper transferred by the transfer device 118 is sent to a fixing unit including a heat roll 119 and a backup roll 120 via a paper transport path 183. The heat roll 119 includes a heater lamp for heating inside, and heats, pressurizes, and fixes the toner by heating the heat roll 119 to a predetermined temperature. The printing paper on which the toner is fixed is conveyed to the paper conveyance path 184, and the conveyance direction is reversed at the timing when the trailing edge of the printing paper passes the paper conveyance path 184, and the paper conveyance path 185 (the same paper as the paper conveyance path 184). The paper is transported to the paper transport path 186 via the transport path in the reverse transport direction). By doing so, the front and back sides of the printing paper are reversed, and the printing apparatus 103 can print on the back side. The printing paper that has passed through the paper transport path 186 is transported to the paper transport path 187 of the printing apparatus 103.
  The printing apparatus 103 is equipped with four color developing machines, a Y (yellow) developing machine 151, an M (magenta) developing machine 152, a C (cyan) developing machine 153, and a K (black) developing machine 154. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 155 in a superimposed manner. The toner transferred on the intermediate transfer belt 155 is transferred onto the printing paper conveyed via the paper conveyance path 187 by the transfer unit 156.
  The toner on the printing paper transferred by the transfer unit 156 is sent to a fixing unit including a heat roll 157 and a backup roll 158 via a paper transport path 188. The heat roll 157 includes a heater lamp for heating, and heats, pressurizes, and fixes the toner by heating the heat roll 157 to a predetermined temperature. The image on the printing paper on which the toner is fixed passes through the paper conveyance path 189 and is conveyed to the paper discharge device 104. The printing paper conveyed to the paper discharge device 104 is discharged to any of the upper tray 171, the stacker 172, or the stacker 173.
  FIG. 6 is a schematic configuration diagram of a printing apparatus having a continuous paper tandem configuration. This printing apparatus includes printing apparatuses 201 and 202, and a turn bar 203 that reverses the front and back surfaces of printing paper. A printing paper fed from a paper feeding device (not shown) is fed to the preceding printing device 201 via a paper conveyance path 281.
  The printing apparatus 201 is equipped with four color developing machines, a Y (yellow) developing machine 211, an M (magenta) developing machine 212, a C (cyan) developing machine 213, and a K (black) developing machine 214. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 215 in an overlapping manner. The toner transferred and superimposed on the intermediate transfer belt 215 is transferred by the transfer unit 216 to the printing paper conveyed via the paper conveyance path 281.
  The toner on the printing paper transferred by the transfer device 216 is sent to a fixing unit including a heat roll 217 and a backup roll 218. The heat roll 217 includes a heater lamp for heating inside, and heats / presses and fixes the toner by heating the heat roll 217 to a predetermined temperature. The printing paper on which the toner is fixed is conveyed to the paper conveyance path 282, and the front and back of the printing paper are reversed by the turn bar 203. The printing paper that has been turned upside down by the turn bar 203 can be printed on the back side by the printing apparatus 202.
  The printing apparatus 202 is equipped with four color developing machines, a Y (yellow) developing machine 251, an M (magenta) developing machine 252, a C (cyan) developing machine 253, and a K (black) developing machine 254. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 255 in an overlapping manner. The toner transferred and superimposed on the intermediate transfer belt 255 is transferred by the transfer unit 256 to the printing paper conveyed via the paper conveyance path 283.
  The toner on the printing paper transferred by the transfer unit 256 is sent to a fixing unit including a heat roll 257 and a backup roll 258. The heat roll 257 includes a heater lamp for heating, and heats / presses and fixes the toner by heating the heat roll 257 to a predetermined temperature. The image on the printing paper on which the toner is fixed passes through the paper conveyance path 284 and is conveyed to a paper discharge device (not shown).
  The printing apparatuses used in the above system have a single-sided printing function or a double-sided printing function for each printing apparatus, so that each printing apparatus can keep color reproducibility such as image density optimal. Provide feedback control.
  However, even if each printing device performs control to keep the color reproducibility optimal, the color reproducibility of each printing device is slightly different, so these printing devices are configured in tandem and the same When printing on paper, the color reproducibility shift of each printing apparatus becomes remarkable. As countermeasures, methods disclosed in Patent Document 1 and Patent Document 2 have been proposed.
  In Patent Document 1, the printing apparatus is set to an inspection mode, a predetermined inspection chart is printed on the same surface of the printing paper by a plurality of printing apparatuses, and the inspection chart printed on the same surface is read to thereby print the printing apparatus. There has been proposed a method of determining the state of the.
  In other words, since the inspection chart printed by the preceding printing apparatus is fixed by the fixing means of each of the preceding and succeeding printing apparatuses, the inspection chart printed by the succeeding printing apparatus only needs to be fixed once. There is one more process. For this reason, the color reproducibility is determined based on the printing results in which the number of fixing processes is different in the preceding and succeeding printing apparatuses. When the color reproducibility is determined based on the results of printing on the same surface with multiple printing devices, and the color reproducibility of the printing device is corrected based on the determination results, In the case of so-called single-sided printing, correction of color reproducibility works effectively.
  On the other hand, when performing double-sided printing in a tandem printing system, for example, the front side is printed by a front-stage printing apparatus, and the back side is printed by a rear-stage printing apparatus. Therefore, in the case of duplex printing, fixing is performed by the fixing unit of the preceding printing apparatus, and the back surface is fixed by the fixing unit of the subsequent printing apparatus. When correction of color reproducibility is performed based on the print result of the inspection chart printed by the printing device, it is not an appropriate correction, and the print result printed by the preceding printing device and the printing device printed by the latter step are printed. There is a problem that a difference occurs in the color reproducibility of printing results.
  Further, in Patent Document 2, there is a problem that it is difficult to correct the printing apparatus with respect to changes over time, and a processing apparatus with high performance is required for the image processing unit.
JP 2007-137010 A JP 2007-88969 A
  In view of the above problems, an object of the present invention is to provide a printing apparatus capable of improving the color reproducibility of the front and back when performing double-sided printing with a plurality of printing apparatuses configured in tandem.
  In order to achieve the above object, according to a first aspect of the present invention, there is provided a printing apparatus of a system that performs a double-sided printing with a plurality of printing apparatuses in a tandem configuration. A sensor for measuring a printed image is provided.
  According to a second means of the present invention, in the first means, at a predetermined timing, a predetermined pattern is printed on one side of the printing paper by the front-stage printing apparatus having the tandem configuration, and the same paper is printed by the rear-stage printing apparatus. A predetermined pattern is printed on the back surface, and images on both surfaces are measured by the sensor.
  According to a third means of the present invention, in the second means, the printing conditions of the front-stage printing apparatus, the rear-stage printing apparatus, or both the front-stage and rear-stage printing apparatuses based on the measurement result of the double-sided image by the sensor. Is automatically corrected to make the color reproducibility of the front and back surfaces the same.
  According to the present invention, it is possible to control to always maintain the color reproducibility of the front and back when a plurality of printing apparatuses are configured in tandem to perform duplex printing.
  As described above, according to the present invention, a print output printed by a front-stage printing apparatus, for example, a front-surface print output, and a print output printed by a rear-stage print apparatus, for example, a back-surface print output, After passing through the fixing unit, the front and back images of the printing paper are measured with sensors, and based on the measurement results, the colors of the preceding printing device, the following printing device, or both the preceding printing device and the following printing device It is characterized by performing feedback control to keep reproducibility optimal.
  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best mode for carrying out the invention will be described with reference to the drawings.
  FIG. 1 is a schematic configuration diagram of a tandem duplex printing system when cut paper is used. The tandem configuration printing system in FIG. 1 includes a paper feeding device 101, printing devices 102 and 103, and a paper discharge device 104. The paper feeding device 101 includes a plurality of paper feeding trays 111 and 112. The printing paper fed from the paper feeding trays 111 and 112 is fed to the printing apparatus 102 via the paper transport path 181.
  The printing apparatus 102 is equipped with four color developing machines, a Y (yellow) developing machine 113, an M (magenta) developing machine 114, a C (cyan) developing machine 115, and a K (black) developing machine 116. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 117 in an overlapping manner. The toner transferred onto the intermediate transfer belt 117 is transferred onto the printing paper conveyed via the paper conveyance path 182 by the transfer device 118.
  The toner on the printing paper transferred by the transfer device 118 is sent to a fixing unit including a heat roll 119 and a backup roll 120 via a paper transport path 183. The heat roll 119 includes a heater lamp for heating inside, and heats, pressurizes, and fixes the toner by heating the heat roll 119 to a predetermined temperature. The printing paper on which the toner is fixed is conveyed to the paper conveyance path 184, and the conveyance direction is reversed at the timing when the trailing edge of the printing paper passes the paper conveyance path 184, and the paper conveyance path 185 (the same paper as the paper conveyance path 184). The paper is transported to the paper transport path 186 via the transport path in the reverse transport direction). By doing so, the front and back sides of the printing paper are reversed, and the printing apparatus 103 can print on the back side. The printing paper that has passed through the paper transport path 186 is transported to the paper transport path 187 of the printing apparatus 103.
  The printing apparatus 103 is equipped with four color developing machines, a Y (yellow) developing machine 151, an M (magenta) developing machine 152, a C (cyan) developing machine 153, and a K (black) developing machine 154. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 155 in a superimposed manner. The toner transferred on the intermediate transfer belt 155 is transferred onto the printing paper conveyed via the paper conveyance path 187 by the transfer unit 156.
  The toner on the printing paper transferred by the transfer unit 156 is sent to a fixing unit including a heat roll 157 and a backup roll 158 via a paper transport path 188. The heat roll 157 includes a heater lamp for heating, and heats, pressurizes, and fixes the toner by heating the heat roll 157 to a predetermined temperature. The image on the printing paper on which the toner is fixed is measured by the front surface sensor 159 and the back surface sensor 160, and then is conveyed to the paper discharge device 104 through the paper conveyance path 189. The printing paper conveyed to the paper discharge device 104 is discharged to any of the upper tray 171, the stacker 172, or the stacker 173.
  In the printing system having the tandem configuration as described above, a method for correcting the color reproducibility of each printing apparatus to be the same will be described below. The printing system is controlled by the control unit 130 and the control unit 165, and the control unit 130 and the control unit 165 operate in cooperation. Either of the control unit 130 and the control unit 165 that operate in cooperation can be a main control unit, and the main control unit can control the remaining control units as sub-control units. In this description, the control unit 130 will be described as a main control unit.
  At a predetermined timing, the control unit 130 instructs the printing apparatus 102 to print a predetermined patch for confirming color reproducibility on the paper after picking up the printing paper from the paper supply apparatus 101. An example of a patch to be printed is shown in FIG. Patches such as shown in FIG. 3A are applied to a Y (yellow) developing machine 113, an M (magenta) developing machine 114, a C (cyan) developing machine 115, a K (black) developing machine 116, and an intermediate transfer belt. The image is transferred to printing paper by 117 and a transfer device 118. The predetermined patch transferred to the printing paper is heated / pressurized and fixed by a heat roll 119 having a heater lamp for heating inside and heated to a predetermined temperature.
  The control unit 130 instructs the printing apparatus 103 to print a predetermined patch as shown in FIG. 3B on the back surface of the printing paper on which the patch is printed. The patches shown in FIG. 3B are printed on the Y (yellow) developing device 151, the M (magenta) developing device 152, the C (cyan) developing device 153, the K (black) developing device 154, and the intermediate transfer belt 155 of the printing apparatus 103. The image is transferred to the back surface of the printing paper by a transfer device 156. The predetermined patch transferred to the back surface of the printing paper is heated, pressurized, and fixed by a heat roll 157 having a heater lamp for heating inside and heated to a predetermined temperature. For the printing paper heated, pressurized and fixed by the heat roll 157, the patch printed by the printing device 102 is read by the front surface sensor 159, and the patch printed by the printing device 103 is read by the back surface sensor 160. The patch information read by the front surface sensor 159 and the back surface sensor 160 is processed by the control unit 130 and the control unit 165 and corrected so that the color reproducibility of each printing apparatus becomes the same.
  Color reproducibility correction by the above method is automatically performed when the system power is turned on, when returning from the standby state, after a certain period of time, after printing a certain number of sheets, when the temperature and humidity change more than specified, or Performed manually. Note that if the printing paper on which the patch is printed is discharged to the upper tray 171, the stacker 172, and the stacker 173 of the paper discharge device 104, it is confused with the print output that is printed in the normal operation. The paper is automatically discharged to the sample tray 161 via the paper conveyance path 190. However, it is also possible to output the printing paper on which the patch is printed to the upper tray 171 by the operation of the operator or maintenance personnel.
  FIG. 2 is a schematic configuration diagram of a tandem duplex printing system using continuous paper. The printing system having the tandem configuration shown in FIG. 2 includes printing apparatuses 201 and 202, and a turn bar 203 that reverses the front and back surfaces of printing paper. A printing paper fed from a paper feeding device (not shown) is fed to the preceding printing device 201 via a paper conveyance path 281.
  The printing apparatus 201 is equipped with four color developing machines, a Y (yellow) developing machine 211, an M (magenta) developing machine 212, a C (cyan) developing machine 213, and a K (black) developing machine 214. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 215 in an overlapping manner. The toner transferred and superimposed on the intermediate transfer belt 215 is transferred by the transfer unit 216 to the printing paper conveyed via the paper conveyance path 281.
  The toner on the printing paper transferred by the transfer device 216 is sent to a fixing unit including a heat roll 217 and a backup roll 218. The heat roll 217 includes a heater lamp for heating inside, and heats / presses and fixes the toner by heating the heat roll 217 to a predetermined temperature. The printing paper on which the toner is fixed is conveyed to the paper conveyance path 282, and the front and back of the printing paper are reversed by the turn bar 203. The printing paper that has been turned upside down by the turn bar 203 can be printed on the back side by the printing apparatus 202.
  The printing apparatus 202 is equipped with four color developing machines, a Y (yellow) developing machine 251, an M (magenta) developing machine 252, a C (cyan) developing machine 253, and a K (black) developing machine 254. The developing machine forms characters and images exposed by an optical unit (not shown) as toner images, and these four color toner images are transferred onto the intermediate transfer belt 255 in an overlapping manner. The toner transferred and superimposed on the intermediate transfer belt 255 is transferred by the transfer unit 256 to the printing paper conveyed via the paper conveyance path 283.
  The toner on the printing paper transferred by the transfer unit 256 is sent to a fixing unit including a heat roll 257 and a backup roll 258. The heat roll 257 includes a heater lamp for heating, and heats / presses and fixes the toner by heating the heat roll 257 to a predetermined temperature. The image on the printing paper on which the toner is fixed is measured by the front surface sensor 259 and the back surface sensor 260, and then passes through the paper conveyance path 284 and is conveyed to a paper discharge device (not shown).
  In the printing system having the tandem configuration as described above, a method for correcting the color reproducibility of each printing apparatus to be the same will be described below. The printing system is controlled by the control unit 230 and the control unit 265, and the control unit 230 and the control unit 265 operate in cooperation. Either of the control unit 230 and the control unit 265 that operate in cooperation can be a main control unit, and the main control unit can control the remaining control units as sub-control units. In this description, the control unit 230 will be described as a main control unit.
  The control unit 230 instructs the printing apparatus 201 to print a predetermined patch for confirming color reproducibility on a printing sheet supplied from a paper feeding apparatus (not shown) at a predetermined timing. An example of a patch to be printed is shown in FIG.
  4 (a), the Y (yellow) developing machine 211, the M (magenta) developing machine 212, the C (cyan) developing machine 213, the K (black) developing machine 214, and the intermediate transfer belt 215 of the printing apparatus 201 The image is transferred to printing paper by a transfer device 216. The predetermined patch transferred to the printing paper is heated / pressurized and fixed by a heat roll 217 having a heater lamp for heating inside and heated to a predetermined temperature.
  The control unit 230 instructs the printing apparatus 202 to print the patch shown in FIG. 4B on the back surface of the printing paper on which the patch is printed. 4B, the Y (yellow) developing machine 251, the M (magenta) developing machine 252, the C (cyan) developing machine 253, the K (black) developing machine 254, and the intermediate transfer belt 255 of the printing apparatus 202 are applied. The image is transferred to the back surface of the printing paper by a transfer device 256. The predetermined patch transferred to the back surface of the printing paper is heated / pressurized and fixed by a heat roll 257 which has a heater lamp for heating inside and is heated to a predetermined temperature. For the printing paper heated, pressurized and fixed by the heat roll 257, the front surface sensor 259 reads the patch printed by the printing device 201, and the back surface sensor 260 reads the patch printed by the printing device 202. The patch information read by the front surface sensor 259 and the back surface sensor 260 is processed by the control unit 230 and the control unit 202 and corrected so that the color reproducibility of each printing apparatus becomes the same.
  Color reproducibility correction by the above method is automatically performed when the system power is turned on, when returning from the standby state, after a certain period of time, after printing a certain number of sheets, when the temperature and humidity change more than specified, or Performed manually. In addition, as shown in FIG. 4, the patch is printed without damaging the area where the printing result is printed by printing the patch on both ends of the printing paper to be discarded after the printing is finished in the printing apparatus. Is possible. Of course, the patch may be printed in an area for printing the print result, and the page on which the patch is printed may be removed by a post-processing device or the like.
It is a schematic block diagram of the printing apparatus in the cut paper tandem structure which concerns on Example 1 of this invention. It is a schematic block diagram of the printing apparatus in the continuous paper tandem structure which concerns on Example 2 of this invention. It is a figure which shows an example of the surface patch and back surface patch in the cut paper produced in Example 1. FIG. 6 is a diagram illustrating an example of a front surface patch and a back surface patch on continuous paper created in Example 2. FIG. It is a schematic block diagram of the printing apparatus in the conventional cut paper tandem structure. It is a schematic block diagram of the printing apparatus in the conventional continuous paper tandem structure.
Explanation of symbols
  Reference numeral 101 denotes a paper feeding device, 102, 103, 201, 202 denotes a printing device, 104 denotes a paper discharge device, 111, 112 denote paper feeding trays, 113, 151, 211, 251 denote Y (yellow) developing machines, 114, 152, 212 and 252 are M (magenta) developing machines, 115, 153, 213 and 253 are C (cyan) developing machines, 116, 154, 214 and 254 are K (black) developing machines, and 117, 155, 215 and 255 are intermediate. Transfer belts 118, 156, 216, 256 are transfer units, 119, 157, 217, 257 are heat rolls, 120, 158, 218, 258 are backup rolls, 130, 165, 230, 265 are control units, 159, 259 Is a front surface sensor, 160 and 260 are back surface sensors, 161 is a sample tray, 171 is an upper tray, and 172 and 17 Stacker, 181,182,183,184,185,186,187,188,189,190,281,282,283,284 the sheet conveying path, 203 is the angle bar.

Claims (3)

  1.   In a printing apparatus of a system for performing double-sided printing with a plurality of printing apparatuses configured in tandem, a sensor for measuring images printed on both sides of the printing paper is provided at the rear stage of the fixing unit of the final-stage printing apparatus. Printing device to do.
  2.   At a predetermined timing, a predetermined pattern is printed on one side of the printing paper by the front-stage printing apparatus having the tandem configuration, and a predetermined pattern is printed on the back side of the same paper by the rear-stage printing apparatus. The printing apparatus according to claim 1, wherein an image is measured.
  3.   Based on the measurement results of the images on both sides by the sensor, the front and back printing devices, or both the front and back printing devices, automatically correct the printing conditions to ensure the same color reproducibility on the front and back sides. The printing apparatus according to claim 2, wherein:
JP2008154758A 2008-06-13 2008-06-13 Printing device Pending JP2009300703A (en)

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
JP2012058487A (en) * 2010-09-09 2012-03-22 Konica Minolta Business Technologies Inc Image forming system
JP2012068463A (en) * 2010-09-24 2012-04-05 Konica Minolta Business Technologies Inc Image forming system
JP2012068286A (en) * 2010-09-21 2012-04-05 Konica Minolta Business Technologies Inc Image forming system
JP2012103522A (en) * 2010-11-11 2012-05-31 Konica Minolta Business Technologies Inc Image forming system
JP2013057748A (en) * 2011-09-07 2013-03-28 Konica Minolta Business Technologies Inc Image forming system
JP2013064911A (en) * 2011-09-20 2013-04-11 Konica Minolta Business Technologies Inc Image forming apparatus
JP2015090465A (en) * 2013-11-07 2015-05-11 コニカミノルタ株式会社 Image forming apparatus, image forming system, and image forming method
JP2015113214A (en) * 2013-12-13 2015-06-22 コニカミノルタ株式会社 Image formation system
JP2016184061A (en) * 2015-03-26 2016-10-20 コニカミノルタ株式会社 Image forming system and image forming method
JP2017058505A (en) * 2015-09-16 2017-03-23 コニカミノルタ株式会社 Image forming system, image density correction method, and image forming apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012058487A (en) * 2010-09-09 2012-03-22 Konica Minolta Business Technologies Inc Image forming system
JP2012068286A (en) * 2010-09-21 2012-04-05 Konica Minolta Business Technologies Inc Image forming system
JP2012068463A (en) * 2010-09-24 2012-04-05 Konica Minolta Business Technologies Inc Image forming system
JP2012103522A (en) * 2010-11-11 2012-05-31 Konica Minolta Business Technologies Inc Image forming system
US8736904B2 (en) 2010-11-11 2014-05-27 Konica Minolta Business Technologies, Inc. Image forming system
JP2013057748A (en) * 2011-09-07 2013-03-28 Konica Minolta Business Technologies Inc Image forming system
US8936361B2 (en) 2011-09-07 2015-01-20 Konica Minolta Business Technologies, Inc. Image forming system
JP2013064911A (en) * 2011-09-20 2013-04-11 Konica Minolta Business Technologies Inc Image forming apparatus
JP2015090465A (en) * 2013-11-07 2015-05-11 コニカミノルタ株式会社 Image forming apparatus, image forming system, and image forming method
JP2015113214A (en) * 2013-12-13 2015-06-22 コニカミノルタ株式会社 Image formation system
JP2016184061A (en) * 2015-03-26 2016-10-20 コニカミノルタ株式会社 Image forming system and image forming method
US10129436B2 (en) 2015-03-26 2018-11-13 Konica Minolta, Inc. Image forming system and image forming method
JP2017058505A (en) * 2015-09-16 2017-03-23 コニカミノルタ株式会社 Image forming system, image density correction method, and image forming apparatus

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