JP5316177B2 - Image forming apparatus and colorimetric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of surely making a paper feed correction and performing accurate colorimetry in consequence. <P>SOLUTION: A carrying condition code 601 is printed with information on the by-medium correction amounts (x) or the like of non-shared media of a by-paper correction amount storage section 131 and a unique correction amount storage section 132. The carrying condition code 601 is read by a photosensor 111 and sent to a code generation analysis section 128. The code generation analysis section 128 analyzes the carrying condition code 601 and sends the analyzed result to a control section 120. The control section 120 extracts and determines the type of paper A from the information on the analyzed result, determines a correction amount based on the type of paper A and controls a carrying mechanism 124. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an image forming apparatus and a colorimetric apparatus.

  Some full-color image forming apparatuses (printing apparatuses) have a built-in colorimeter so that a printed material can be directly measured. When colorimetrically measuring a printed matter with a colorimeter, first, a color chart for color measurement is printed on a sheet, and the printed color chart is moved to the colorimeter to perform color measurement.

  By the way, the color of printed matter printed by an ink jet printer may change with the passage of time since printing due to the penetration of ink into paper and the evaporation of moisture. Therefore, when performing color measurement, it is desirable to perform color measurement after sufficient time has elapsed since printing.

  As for an image forming apparatus with a colorimeter, there has been proposed a colorimetric accuracy determination device that can easily and reliably determine whether or not the color measurement accuracy is normal (for example, Patent Document 1). .

JP 2008-79225 A

  By the way, in the image forming apparatus, paper conveyance is performed using a roller. However, since the friction coefficient between the paper and the roller differs depending on the paper type, the rotation amount of the roller and the paper feed amount do not always coincide. Therefore, in general, the paper feed amount is corrected according to the slip amount of each paper.

  Therefore, the color chart for color measurement is printed on a cut sheet, or after printing on a roll sheet, the roll sheet is cut, and the printed matter once discharged from the image forming apparatus is conveyed again from the conveyance unit. When performing color measurement, if the paper feed correction is not performed in the same way as at the time of printing, the color chart may be displaced with respect to the colorimeter, and correct color measurement may not be performed.

  In the case described above, when carrying out the immediate color transport, the user can correct the paper feed correction at the time of printing by correctly setting the type of the printed paper. However, it is troublesome for the user to input the paper type one by one, and if the paper type input by the user is incorrect, accurate color measurement cannot be performed.

  Also, when performing color measurement with an image forming apparatus that is different from the image forming apparatus used for printing, even if the paper type is specified but the correction amount for that paper type is not set in the image forming apparatus used for color measurement Cannot accurately correct the paper feed.

  Therefore, an object of the present invention is to provide a technique for preventing the color chart from being displaced with respect to the colorimeter when performing colorimetry on a printed matter discharged from the image forming apparatus after printing the colorimetric color chart. Is to provide.

  An image forming apparatus according to an aspect of the present invention includes a transport unit that transports a medium, an image forming unit that forms an image on the medium, and a measurement unit that measures an image formed by the image forming unit, The image forming unit forms information on the conveyance of the medium performed by the conveyance unit when forming an image on the medium as a part of the image on the medium.

  As a result, information regarding the conveyance of the medium performed by the conveyance unit at the time of image formation can be obtained. Therefore, when the image is measured by the measurement unit, the medium can be conveyed under the same conditions as at the time of image formation.

  In a preferred embodiment, the information related to conveyance of the medium may be information on the medium.

  In a preferred embodiment, the information related to the conveyance of the medium may include a conveyance amount of the medium, identification information of a medium different from the medium, and a conveyance amount.

  An image forming apparatus according to an aspect of the present invention includes a transport unit that transports a medium, an image forming unit that forms an image on the medium, and a measurement unit that measures an image formed by the image forming unit, The said conveyance part conveys based on the information regarding the conveyance acquired from the said medium.

  As a result, information regarding the conveyance of the medium performed by the conveyance unit at the time of image formation can be obtained. Therefore, when the image is measured by the measurement unit, the medium can be conveyed under the same conditions as at the time of image formation.

  An image forming apparatus according to one aspect of the present invention includes a transport unit that transports a medium by performing transport amount correction for each type of medium to be transported based on a correction amount that is set in advance according to the type of the medium, A test pattern having one or more color charts is formed at different positions in the transport direction of the medium transported by the transport unit, and an identification image indicating transport conditions related to the transport amount correction is formed on the medium. An image forming unit.

  As a result, a test pattern and an identification image indicating a conveyance condition relating to conveyance amount correction can be formed on the medium.

  The colorimetric apparatus according to one aspect of the present invention includes a transport unit that transports a medium by performing transport amount correction for each type of transport medium, and one or more colors at different positions in the transport direction of the transport unit. A colorimeter that performs colorimetry of a color chart on the cut medium while conveying the cut medium on which the test pattern having a vote and a predetermined identification image are formed by the conveyance unit; and the cut A reading unit that reads the identification image on the read medium; an extraction unit that analyzes the identification image read by the reading unit and extracts conveyance conditions relating to conveyance amount correction when the test pattern is formed; and A determining unit that determines a correction amount when the transport unit transports the cut medium based on the transport condition regarding the transport amount correction extracted by the transport unit, and the transport unit includes the measurement unit. Vessels is when performing colorimetry, for transporting the cut medium by performing the conveyance amount correction of a correction amount in which the determination unit has determined.

  Thereby, the conveyance amount correction at the time of image formation can be reproduced in a colorimetric device different from the image forming device on which the test pattern is formed.

  In a preferred embodiment, the transport condition relating to the transport amount correction includes a first correction amount according to a type of the medium performed when the image forming apparatus that has formed the test pattern forms the test pattern, and A second correction amount for a reference medium in the image forming apparatus on which the test pattern is formed is included, and the colorimetric device further includes a medium-specific correction amount storage unit that stores a medium-specific correction amount in the colorimetry device. The determination unit stores the first correction amount and the second correction amount included in the transport condition, and the medium-by-medium transport amount storage unit. Based on the third correction amount with respect to the reference medium, a correction amount for the conveyance amount correction by the conveyance unit when the colorimeter performs color measurement may be determined.

  An image forming apparatus according to one aspect of the present invention includes a transport unit that transports a medium by performing transport amount correction for each type of medium to be transported based on a correction amount that is set in advance according to the type of the medium, A test pattern having one or more color charts is formed at different positions in the transport direction of the medium transported by the transport unit, and an identification image indicating transport conditions related to the transport amount correction is formed on the medium. The color chart on the cut medium is measured while the cut section having the image forming section to be formed and the test pattern and the identification image formed by the image forming section are transported by the transport section. A colorimeter, a reading unit that reads the identification image on the cut medium, an analysis unit that analyzes a conveyance condition indicated by the identification image read by the reading unit, and the conveyance , When the colorimeter performs colorimetry, for transporting the cut medium by performing the conveyance amount correction according transport conditions in which the analysis unit has analyzed.

  According to the present invention, when carrying out color measurement, it is possible to perform the same conveyance amount correction as that during image formation, thereby making it possible to accurately perform color measurement.

1 is an external perspective view of a printer as an image forming apparatus according to an embodiment of the present invention. 1 is a schematic side view of a printer according to an embodiment. 1 is a block configuration diagram of a printer according to an embodiment. It is a figure which shows the content of the correction amount memory | storage part classified by medium. It is a figure which shows the paper on which the test pattern P and the conveyance condition code were printed. It is explanatory drawing of the estimation method of the correction amount according to medium of a non-shared medium. It is a flowchart which shows the procedure of a printing process. It is a flowchart which shows the procedure of a colorimetry process.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an external perspective view of a printer as an image forming apparatus according to an embodiment of the present disclosure. In the following embodiments, a printer that ejects ink onto printing paper will be described as an example. However, the present invention can be applied to a liquid ejecting apparatus that ejects liquid onto a predetermined medium in addition to the printer.

  In the printer 100, as shown in the figure, the tray 101 extends in the direction in which the paper (medium) A on which the image (test pattern P) is printed is transported by the transport mechanism. A rail 102 and a colorimeter (measuring unit) 103 are attached to a predetermined position of the tray 101.

  The rail 102 is installed in parallel with the main scanning direction of a carriage described later. The colorimeter 103 moves on the rail 102 and directs the detection unit to the test pattern P to be measured, so that a plurality of colors based on the L * a * b * color system defined by the International Lighting Commission It is possible to acquire a color value composed of the components L, a, and b as a colorimetric value.

  FIG. 2 is a schematic side view of the printer 100 of FIG.

  The printer 100 includes a paper feed roller pair 106 that feeds the roll paper A, and a transport roller pair 109 (109a, b) that transports the fed paper. Then, the paper A fed out from the paper roll 105 is transported in the direction of arrow C by the paper feed roller pair 106 and the transport roller pair 109 (109a, b) on the downstream side in the transport direction. Further, the transport roller pair 109 can transport a cut sheet B such as a cut sheet or a sheet cut from the sheet roll 105.

  The printer 100 further includes a carriage 107, a colorimeter 103 (measuring unit), and a cutter 108. The carriage 107, the colorimeter 103, and the cutter 108 are arranged in this order on the downstream side of the paper feed roller pair 106. The carriage 107 includes a head 110 and a photo sensor 111 (reading unit).

  The paper feed roller pair 106 feeds the roll paper A of the paper roll 105. For example, the paper feed roller pair 106 is used only when the roll paper A is fed to the place of the transport roller pair 109.

  The transport roller pair 109 (transport unit) transports the roll paper A or the cut paper (medium) B supplied from the paper feed roller pair 106. The conveyance roller pair 109 is used for paper conveyance during printing and color measurement, and the paper feed roller pair 106 is not used.

  The carriage 107 reciprocates in the direction perpendicular to the drawing (front and back directions in the drawing). At this time, the head 110 ejects ink. Further, the sheet A or B is appropriately conveyed in the direction C, whereby an image is formed on the sheet A or C by the ink ejected by the head 110.

  Further, when the carriage 107 reciprocates in the direction perpendicular to the drawing, the photo sensor 111 reads an image printed on a sheet. For example, as will be described later, the photo sensor 111 detects the cut sheet B, for example, a cut sheet paper or a sheet cut from the sheet roll 105 by the cutter 108 when the sheet is conveyed by the conveying roller pair 109. The conveyance condition code 601 (identification image) printed on the printed paper B is read. The transport condition code 601 will be described later.

  The colorimeter 103 measures an image formed by the head 110. Further, the colorimeter 103 is a cut sheet on which a test pattern having one or more color charts and a transport condition code 601 are formed at different positions in the transport direction C by the transport roller pair 109 (FIG. 5). The color chart on the cut sheet is measured while being conveyed by the conveying roller pair 109.

  The cutter 108 cuts the paper A drawn from the paper roll 105. The paper cut by the cutter 108 and separated from the paper roll 105 becomes the cut paper B.

  FIG. 3 is a functional block configuration diagram of the printer of FIG.

  The printer 100 includes the colorimeter 103, the cutter 108, the photo sensor 111, the control unit 120, the roll paper feed mechanism 122 including the paper feed roller pair 106, and the transport roller pair 109 shown in FIG. A paper transport mechanism (conveyance unit) 124 including a print mechanism (image forming unit) 126 including a head 110, a code generation analysis unit (extraction unit) 128, a paper-specific correction amount storage unit 131, and a specific correction amount. A storage unit 132 and a print setting storage unit 133 are provided.

  The correction amount storage unit 131 for each paper stores correction amounts for each paper type when the transport mechanism 124 transports various types of paper.

  FIG. 4 is a diagram illustrating the contents of the sheet-specific correction amount storage unit 131.

  In the correction amount storage unit 131 for each sheet, a sheet type (type) is associated with a correction amount (correction value) for sheet feeding on the sheet. Here, the type 1 paper is a shared paper in which the correction amount is registered in another printer (individual) manufactured by the same manufacturer. For example, for shared paper, the respective correction amounts may be registered at the time of shipment from the manufacturer. Type 2 is paper that is not shared paper (non-shared paper). Non-shared paper is paper registered by the user of each printer. Therefore, the correction amount is not always registered in another printer (individual) manufactured by the same manufacturer.

  Returning to FIG. 3, the unique correction amount storage unit 132 stores the correction amount of the conveyance amount correction unique to each printer. Each printer has some individual differences. For example, the transport amount when the transport mechanism 124 transports the paper also has individual differences. Therefore, in order to absorb the individual difference, the specific correction amount storage unit 132 stores a specific correction amount indicating the correction amount of the conveyance amount specific to each individual. Although details will be described later, the conveyance amount correction performed by the conveyance mechanism 124 is determined by the sum of the intrinsic correction amount of the printer and the correction amount corresponding to the paper type. The inherent correction amount is set at the time of factory shipment, for example.

  The print setting storage unit 133 stores print settings for printing. The print setting includes a paper type.

  The roll paper feed mechanism 122 feeds roll paper from the paper roll 105.

  The transport mechanism 124 transports a medium (paper). The transport mechanism 124 may perform transport based on information related to transport acquired from the medium. Further, the transport mechanism 124 transports the medium by correcting the transport amount for each type of medium to be transported. For example, when the printing mechanism 126 performs printing, the paper conveyance is performed by correcting the conveyance amount corresponding to the paper type of the print setting stored in the print setting storage unit 133. Further, when the colorimeter 103 performs colorimetry of the test pattern printed on the cut paper, the paper is transported by correcting the transport amount corresponding to the type of the cut paper. In any of these cases, the control unit 120 may determine the correction amount. A method of determining this correction amount will be described later.

  The printing mechanism 126 forms an image on a medium (paper). When forming an image on the medium, the printing mechanism 126 forms information on the medium conveyance performed by the conveyance mechanism 124 on the medium as a part of the image. The information related to the conveyance of the medium performed by the conveyance mechanism 124 includes, for example, identification information (identification image) indicating the medium type, or a conveyance amount of the medium, and identification information and a conveyance amount of a medium different from the medium. But you can.

  Further, the printing mechanism 126 forms test patterns (see FIG. 5) each having one or more color charts (color patches) at different positions in the transport direction of the medium transported by the transport mechanism 124, and the medium. An identification image (conveyance condition code) indicating a conveyance condition relating to conveyance amount correction is formed on the top.

  The colorimeter 103 measures the image formed by the printing mechanism 126. For example, when the transport mechanism 124 is transporting a medium (paper) on which a color measurement test pattern P is printed, the test pattern P is read to perform color measurement. In the present embodiment, the test pattern P printed on the cut paper B is read.

  In this embodiment, even if the printer that prints is different from the printer that performs color measurement, or even if a non-shared medium is used for the paper, the paper feed correction can be performed reliably. The transport condition code 601 is printed at the downstream end in the transport direction.

  The code generation / analysis unit 128 generates a transport condition code 601 (see FIG. 5), which is an example of an identification image indicating a transport condition related to transport amount correction when a medium type or a test pattern is formed.

  The code generation / analysis unit 128 analyzes the transport condition code 601 and sends the analysis result to the control unit 120. For example, the code generation / analysis unit 128 analyzes the conveyance condition code 601 read by the photosensor 111, and extracts the conveyance condition relating to the conveyance amount correction when the medium type or the test pattern is formed. The transport condition code 601 may be, for example, a two-dimensional code, but any other code such as a one-dimensional bar code may be adopted.

  In this embodiment, the identification image indicating the conveyance condition relating to the conveyance amount correction when the medium type or the test pattern is formed is coded. However, the identification image is not necessarily coded. For example, the identification image indicating the conveyance condition regarding the conveyance amount correction when the medium type or the test pattern is formed may be a character, a number, or the like.

  FIG. 5 is a diagram illustrating the paper B on which the test pattern P and the conveyance condition code are printed by the printing mechanism 126.

  On the paper B shown in the figure, a positioning marker, a test pattern P, and a conveyance condition code (identification image) 601 are printed. The conveyance condition code 601 is printed at the downstream end in the conveyance direction of the paper B. Each of the test patterns P has one or more color charts (colorimetric patches) at different positions in the transport direction of the medium (paper) transported by the transport mechanism 124.

  When performing colorimetry on the color chart of the test pattern P on the paper B, first, the photo sensor 111 reads the conveyance condition code 601. As a result, the code generation analysis unit 128 analyzes the transport condition code 601 so that the transport condition during printing of the test pattern P can be grasped. Since the transport mechanism 124 can transport the paper under the same transport conditions as in printing, when the colorimeter of the test pattern P is measured by the colorimeter 103, the measurement is performed without misalignment. Color becomes possible.

  Here, as described above, when the transport mechanism 124 transports the paper using the transport roller pair 109, the frictional force between the transport roller pair 109 and the paper differs depending on the paper type. In accordance with the difference in the frictional force, it is necessary to correct the rotation amount of the conveying roller pair 109 for each paper type.

  For example, the control unit 120 refers to the paper-specific correction amount storage unit 131 and specifies the correction amount according to the paper type. Further, the control unit 120 acquires the unique correction amount from the unique correction amount storage unit 132, determines the correction amount for the conveyance amount correction based on the unique correction amount and the correction amount according to the paper type, and determines the correction amount as the conveyance mechanism. An instruction is sent to 124 to make the paper transport amount constant. When the colorimeter 103 reads the printed test pattern P with the same correction as the conveyance amount correction performed when the control unit 120 prints the test pattern P and the conveyance condition code (see FIG. 5) by the printing mechanism 126. This also makes it possible to perform accurate color measurement without causing a positional shift.

  Hereinafter, how to determine the correction amount for the conveyance amount correction performed by the control unit 120 will be described.

  For example, the control unit 120 instructs the transport mechanism 124 to correct the transport amount based on a correction amount set in advance according to the medium (paper) type. For example, when the printing mechanism 126 performs printing, the control unit 120 acquires the paper type included in the print setting from the print setting storage unit 133, refers to the paper-specific correction amount storage unit 131, and sets the paper type. Identify the corresponding correction amount. Then, the control unit 120 instructs the transport mechanism 124 to transport the paper according to the specified correction amount for each paper type.

  In addition, when performing color measurement of the cut medium (paper) B on which the test pattern P and the conveyance condition code 601 are printed, the control unit 120 causes the code generation analysis unit 128 to analyze and extract the conveyance condition code 601. Based on the transport conditions related to the transport amount correction, the correction amount when the transport mechanism 124 transports the cut medium B is determined.

  For example, when performing color measurement with the same printer that printed the test pattern P, or when performing color measurement with a printer (or color measuring device) different from the printer that printed the test pattern P. However, when the paper B is a shared paper, the conveyance condition code 601 may indicate the paper type of the paper B. For example, when the transport condition code 601 indicates the paper type of the paper B, the control unit 120 refers to the paper-specific correction amount storage unit 131 and specifies a correction amount corresponding to the paper type. Then, the control unit 120 instructs the transport mechanism 124 to transport the paper according to the specified correction amount for each paper type.

  On the other hand, when the color measurement is performed by a printer (or color measurement device) different from the printer that has printed the test pattern P, and the paper B is a non-shared paper, the test condition pattern 601 includes the test pattern. The first correction amount according to the medium type performed when the printer having formed the test pattern P is formed by the printer on which the P is formed, and a reference sheet (reference medium) of a predetermined reference type in the printer on which the test pattern P is formed The second correction amount may be included. Here, the first correction amount according to the medium type is a correction amount determined according to the type of the medium, and is the printed medium stored in the correction amount storage unit 131 for each paper of the printer that has performed printing. This is the correction amount for. The second correction amount for the reference paper is a reference paper type correction amount stored in the paper-specific correction amount storage unit 131 of the printer that performed printing. The reference paper may be determined in advance, or the paper type of the reference paper may be included in the transport condition code 601.

  The control unit 120 includes a first correction amount and a second correction amount included in the conveyance condition code 601 and a third medium for the reference medium in the printer 100 stored in the sheet-specific correction amount storage unit 131. Based on the correction amount, the correction amount of the conveyance amount correction by the conveyance mechanism 124 when the printer 100 performs color measurement is determined.

  With reference to FIG. 6, it demonstrates using a specific example.

  As shown in the figure, in a printed printer, an individual specific correction amount is a, a correction amount according to the paper type for printed paper B (non-shared paper) is c, and a reference paper correction amount is m. To do. At this time, the transport condition code 601 includes a correction amount c (first correction amount) corresponding to the paper type of the paper B and a reference paper correction amount m (second correction amount).

  On the other hand, in the printer that performs color measurement, the unique correction amount b unique to each individual is stored in the unique correction amount storage unit 132, and the correction amount n of the reference sheet is stored in the correction amount storage unit 131 for each sheet. The correction amount x corresponding to the paper type for the printed paper B is not stored in the paper-specific correction amount storage unit 131 (unknown).

この結果、制御部１２０が搬送機構１２４へ指示する搬送量補正の補正量は、ｂ＋（ｎ／ｍ）ｃである。 At this time, the control unit 120 of the printer that performs color measurement acquires the correction amount c and the correction amount m of the reference paper according to the paper type of the paper B extracted from the conveyance condition code 601 and the correction amount storage unit 131 for each paper. Based on the corrected amount n of the reference sheet, the correction amount x corresponding to the sheet type for the sheet B is estimated by the following equation.

As a result, the correction amount of the conveyance amount correction that the control unit 120 instructs the conveyance mechanism 124 is b + (n / m) c.

  Next, the operation of the printer having the above configuration will be described with reference to the flowcharts of FIGS.

  FIG. 7 is a flowchart illustrating a printing process procedure for the roll paper A by the printer 100.

  First, the control unit 120 refers to the print settings in the print setting storage unit 133 to identify the paper type of the paper A, and refers to the paper-specific correction amount storage unit 131 to determine whether the paper A is a shared paper. Judgment is made (step S101). If it is a shared sheet, the control unit 120 generates a conveyance condition code 601 indicating the sheet type (step S102). If the sheet is not a shared sheet, that is, a non-shared sheet, the control unit 120 generates a conveyance condition code 601 indicating the correction amount according to the sheet type and the correction amount of the reference sheet (step S103).

  Then, the control unit 120 determines a correction amount for the conveyance amount correction (step S104). Then, when the transport mechanism 124 is transporting according to the correction amount, the printing mechanism 126 prints the positioning marker and the transport condition code 601 on the roll paper A (step S105). When the pulling conveyance mechanism 124 performs conveyance according to the correction amount, the printing mechanism 126 prints the test pattern P (step S106). When printing of the test pattern is completed, the printed roll paper A is cut by the cutter 108 (step S107).

  As a result, a cut sheet B on which the test pattern P and the conveyance condition code 601 were printed was generated.

  FIG. 8 is a flowchart showing a processing procedure for measuring the color of the test pattern P of the cut paper B.

  First, when the cut paper B is supplied, the photo sensor 111 reads the conveyance condition code 601 and the code generation / analysis unit 128 analyzes the conveyance condition code 601 (step S201). Next, the control unit 120 determines whether the type of the cut sheet B is a shared sheet based on the analysis result of the code generation analysis unit 128 (step S202). For example, the determination may be made based on whether or not the conveyance condition code 601 indicates the paper type of the shared paper.

  If it is a shared sheet (step S202: Yes), the control unit 120 refers to the correction amount storage unit 131 for each sheet and acquires the correction amount of the cut sheet B (step S203). On the other hand, when the sheet is not a shared sheet (step S202: No), the control unit 120 determines this based on the correction amount according to the sheet type of the cut sheet B and the correction amount of the reference sheet indicated by the conveyance condition code 601. A correction amount corresponding to the paper type of the cut paper B in the printer 100 is estimated (step S204).

  The control unit 120 determines a correction amount for the conveyance amount correction (step S205). While the transport mechanism 124 is transporting according to the correction amount, the colorimeter 103 performs positioning using a positioning marker and performs colorimetry of each color chart until the end of the test pattern P (Step S206). S207).

  As a result, even when performing colorimetric measurement on cut paper, paper conveyance can be performed under the same conditions as during printing, so accurate colorimetry is possible without causing color chart misalignment. Can do.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

  For example, in the above-described embodiment, the image forming apparatus with the colorimeter has been described as an example. However, the image forming apparatus and the colorimeter having the colorimeter can be realized as separate apparatuses. For example, an image forming apparatus that prints the above-described test pattern and conveyance condition code and a color measurement apparatus that performs color measurement using the cut paper on which they are printed may be configured as separate apparatuses. .

100 Printer 101 Tray 102 Rail 103 Colorimeter 105 Paper roll 107 Carriage 108 Cutter 110 Head 111 Photo sensor 120 Control unit 124 Transport mechanism 126 Printing mechanism 128 Code generation analysis unit 131 Correction table 132 Inherent correction amount 601 Transport condition code

Claims (3)

A transport unit for transporting the medium;
An image forming unit that forms an image on the medium;
A measuring unit that measures an image formed by the image forming unit,
The image forming unit forms information on the conveyance of the medium performed by the conveyance unit when forming an image on the medium on the medium as a part of the image ,
The information relating to the conveyance of the medium includes the conveyance amount of the medium, identification information of a medium different from the medium, and a conveyance amount .   The image forming apparatus according to claim 1, wherein the information related to conveyance of the medium is information on the medium. A transport unit that transports the medium by correcting the transport amount for each type of medium to be transported;
The cut medium in which a test pattern having one or more color charts and a predetermined identification image are formed at different positions in the conveyance direction by the conveyance unit is conveyed while being conveyed by the conveyance unit. A colorimeter for measuring the color chart on the selected medium;
A reading unit that reads the identification image on the cut medium;
An extraction unit that analyzes the identification image read by the reading unit and extracts a conveyance condition related to conveyance amount correction when the test pattern is formed;
A determination unit that determines a correction amount when the transport unit transports the cut medium based on a transport condition relating to the transport amount correction extracted by the extraction unit;
A medium-specific correction amount storage unit that stores a medium-specific correction amount in the colorimetric device,
The transport unit performs transport amount correction of the correction amount determined by the determination unit when the colorimeter performs color measurement, and transports the cut medium.
In the transport conditions relating to the transport amount correction, the image forming apparatus that formed the test pattern formed the first correction amount according to the type of the medium that was performed when the test pattern was formed, and the test pattern. A second correction amount for the reference medium in the image forming apparatus is included;
The determination unit includes the first correction amount and the second correction amount included in the conveyance condition, and the reference medium in the colorimetric device stored in the medium-specific conveyance amount storage unit. A color measurement device that determines a correction amount for the conveyance amount correction by the conveyance unit when the colorimeter performs color measurement based on a third correction amount for

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