JP2012171199A - Inkjet recording device and method of controlling record in the inkjet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording device preventing two-dimensional deviation of the landing positions of ink droplets.SOLUTION: When a recording medium is sucked to a platen by a suction unit, a parameter is obtained that may affect the landing positions of ink droplets from a recording head to the recording medium. On the basis of the acquired parameter, one of a plurality of correction tables is determined in which the correction quantity of the landing positions is determined for the scanning direction of the recording head and for the conveying direction for conveying the recording medium, respectively. The recording medium is sucked to the platen and the drive timing of the recording head is controlled so that the landing positions are corrected according to the determined correction table, and thus recording is performed to the recording medium based on the recording data.

Description

  The present invention relates to an ink jet recording apparatus having a configuration in which a recording medium is adsorbed to a platen, and a recording control method in the ink jet recording apparatus.

In an ink jet recording apparatus, in order to perform stable recording, it is necessary to eliminate as much as possible the influence of deformation (also referred to as cockling) such as wrinkles and waviness that occurs when ink adheres to a recording medium. Therefore, it is known that recording is performed while curling and cockling are suppressed by providing a suction structure that sucks a platen disposed opposite to the recording head and sucking the recording medium to the platen. In addition, there is an ink jet recording apparatus having a configuration for performing borderless recording on a roll paper as a recording medium without a margin. This is configured such that ink is ejected to the outer region beyond the end in the width direction of the recording medium and is cut by a cutter at the rear end of the recording direction in the conveyance direction of the recording medium. In addition, an ink receiving portion is provided for receiving the discharged ink that protrudes outward in the width direction of the recording medium.
A negative pressure suction force is also applied to the ink receiving portion in the same manner as in the suction configuration. This prevents clogging of the discharge holes due to ink ejected in borderless recording, prevents backside contamination of the recording medium due to ink mist staying in the ink receiving portion during borderless recording, and This is to prevent the recording medium from floating at the ink receiving portion. However, if a negative pressure is generated at the ink receiving portion at this time, the ink ejected from the recording head is affected by the air flow generated by the negative pressure suction force, and the landing position of the ink droplet is disturbed, and the image quality is deteriorated. There is a risk of a significant drop. For this reason, it is necessary to reduce the negative pressure generated in the ink receiving portion as much as possible.
As a technique for correcting the disturbance of the landing position of ink droplets, it is generally known that the ejection timing of ink droplets from a recording head is shifted. Patent Document 1 describes a configuration in which a test patch is recorded at a position in the scanning direction of a plurality of carriages, a landing position deviation is obtained by measurement, and the landing position in the carriage scanning direction is corrected based on the amount of landing position deviation. ing.

JP 2009-143152 A

However, in view of the recent demand for higher image quality, even if the negative pressure generated in the ink receiving portion is reduced as much as possible, image degradation caused by disturbance of the ink droplet landing position is not negligible, and there is also an improvement in back stain. It is desired. This disturbance in the landing position is not only a deviation in the carriage scanning direction, but also a two-dimensional deviation including a deviation in the conveyance direction of the recording material, and therefore cannot be corrected by the conventional correction technique. The deviation of the ink droplet landing position in the carriage scanning direction causes image blurring at the end, and the deviation in the conveyance direction causes image degradation as white streaks at every conveyance distance interval.
An object of the present invention is to solve such conventional problems. In view of the above, an object of the present invention is to provide an ink jet recording apparatus that prevents a two-dimensional shift in the landing position of ink droplets and a recording control method in the ink jet recording apparatus.

In order to solve the above-described problems, an ink jet recording apparatus according to the present invention includes a suction unit that adsorbs a recording medium to a platen, and performs recording on the recording medium by scanning a recording head based on recording data. Because
An acquisition unit that acquires a parameter that affects a landing position of an ink droplet from the recording head to the recording medium when the recording medium is attracted to the platen by the suction unit;
Determination means for determining one of the correction amounts of the landing position from a plurality of correction tables determined for the scanning direction of the recording head and the conveyance direction for conveying the recording medium, based on the parameters acquired by the acquisition means. When,
The recording medium is adsorbed to the platen, the drive timing of the recording head is controlled so that the landing position is corrected according to the correction table determined by the determining means, and the recording medium is based on the recording data. And a recording control means for performing recording on the recording medium.

  According to the present invention, it is possible to prevent a two-dimensional shift in the landing position of ink droplets.

1 is a perspective view of an ink jet recording apparatus in an embodiment according to the present invention. FIG. 2 is a perspective view around a recording head of an ink jet recording apparatus. It is an enlarged view near the platen. FIG. 2 is a schematic block diagram around a control circuit unit of the inkjet recording apparatus. FIG. 6 is a schematic diagram for explaining correction of landing deviation in a recording medium end region. FIG. 3 is a schematic diagram for explaining nozzle arrays in a recording head. It is a figure which shows the edge part impact correction table for correct | amending a landing position shift. It is a figure which shows the procedure of the determination process of an edge part edge landing correction table. It is a table for selecting an end portion end landing correction table. It is a figure which shows the flow path from suction to exhaust_gas | exhaustion outside an apparatus. It is another figure which shows the flow path from suction to exhaust_gas | exhaustion outside an apparatus. It is a figure which shows the procedure of the process which performs edge part landing correction | amendment with a test pattern. It is a figure for demonstrating the production | generation method of the patch of a test pattern It is a figure which shows the other procedure of the process which performs edge part landing correction | amendment by a test pattern.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the present invention according to the claims, and all combinations of features described in the present embodiments are not necessarily essential to the solution means of the present invention. . The same constituent elements are denoted by the same reference numerals, and the description thereof is omitted.

[Example 1]
FIG. 1 is a perspective view of an ink jet recording apparatus according to an embodiment of the present invention. The ink jet recording apparatus performs recording by scanning a recording head based on recording data and discharging ink onto a recording medium. FIG. 2 is a perspective view around the recording head of the ink jet recording apparatus, and FIG. 3 is an enlarged view of the vicinity of the platen. A transport roller 1, a pinch roller 2, a platen 3, and a cutter 10 are sequentially arranged in the traveling direction of the roll-shaped recording medium P1 transported through the roll paper transport path from the roll paper automatic paper feeder. The conveyance roller 1 and the pinch roller 2 perform recording by conveying the roll-shaped recording medium P1 conveyed through the roll paper conveyance path to the image recording unit. The image recording unit includes a platen 3 that supports the recording medium P1, and a recording head that is disposed to face the platen 3 and moves in the scanning direction to perform recording by discharging ink onto the recording medium P1 on the platen 3. 4 is provided. The recording head 4 includes a plurality of nozzle rows (not shown) that eject ink on the surface facing the recording medium P1. A plurality of nozzle rows are arranged in the recording medium conveyance direction, and ink of different colors is ejected for each nozzle row. Corresponding color ink is supplied from the ink tank 15 to the nozzle rows of the respective colors via the supply tubes 14. The carriage 16 on which the recording head 4 is mounted is slidably supported by a guide shaft 18 and a guide rail 19 which are fixed to the frame of the ink jet recording apparatus main body 17 and are parallel to each other. The carriage 16 can be reciprocated along the guide shaft 18 and the guide rail 19 by a belt driving unit and a motor (not shown). The moving direction of the carriage 16 is a direction that intersects the recording medium conveyance direction, and is called a main scanning direction. In contrast, the conveyance direction of the recording medium is called a sub-scanning direction. A reflection type optical sensor 20 capable of arbitrarily detecting an image density such as a test pattern is attached to the carriage 16. The optical sensor 20 can also be used for detecting the edge of the recording medium.

  In the image recording operation, for example, when printing for one scan by the recording head 4 is completed, the printing operation is temporarily stopped, and the roll paper on the platen 3 is conveyed by a predetermined amount by the conveying roller 1. Then, the printing is performed for the next one scan while moving the carriage 16 along the guide shaft 18 again. In this way, a desired image is recorded on the recording medium P1 by ejecting ink from the recording head 4 while reciprocating the carriage 16. The carriage 16 can change the distance between the recording head 4 and the platen 3 by moving the guide shaft 18 up and down by an elevator mechanism (not shown). More specifically, the recording medium type and the temperature and humidity detected by the temperature / humidity sensor 434 (FIG. 4) are changed. For example, if the recording medium is thick paper and has strong curl, and the temperature is low and humidity is low, the rigidity becomes high and the paper tends to float. Therefore, the interval between the recording head 4 and the platen 3 is set wider. In addition, in the case of a thin paper and a recording medium with low rigidity, it is set narrower. Depending on the type of recording medium, there is a possibility of collision with the recording head 4 due to cockling when ink is absorbed. Therefore, the interval between the recording head 4 and the platen 3 is changed according to the recording mode and the ink shot amount. May be.

  The recording medium suction portion 5 for sucking and supporting the recording medium on the platen 3 is provided with a suction hole 7 for communicating with the negative pressure generating portion 6 (FIG. 11) to generate a negative pressure (suction force). The floating of the recording medium P1 is prevented. The negative pressure generating unit 6 uses a sirocco fan in order to realize a high negative pressure in a space-saving manner. Further, the negative pressure generating unit 6 is operated at a rotational speed corresponding to the characteristics of the roll-shaped recording medium P1. More specifically, the recording medium type and the temperature and humidity detected by the temperature / humidity sensor 434 are changed. For example, if the recording medium is thick paper and has strong curl, and the temperature is low and humidity is low, the rigidity becomes high and the paper tends to float. In order to suppress paper floating, it is supported more strongly at high rotation speed. Further, when a recording material having a low rigidity is transported with thin paper, it is weakly adsorbed and supported at a low rotational speed in order to improve the transport accuracy. In addition, at a position corresponding to the left and right ends of the recording medium, there is a concave ink suction / recovery section 8 with respect to the sheet passing surface, and an ink suction hole 9 for collecting the discarded ink and sucking floating mist is provided. The bottom surface of the ink suction / recovery unit 8 is formed as a slope, and the discarded ink flows along the slope and flows into the ink suction hole 9 and is collected. The ink suction / recovery unit 8 is provided at each of the left and right ends of each recording medium width corresponding to recording without margins by the ink jet recording apparatus. The recording medium P1 that has finished recording is conveyed by the conveying roller 1 and cut by the cutter 10 at a desired position at the rear end of the recorded image.

  FIG. 4 is a schematic block diagram of the periphery of the control circuit unit of the ink jet recording apparatus. The controller 400 is a main control unit, and includes a CPU 401 that is a microcomputer, for example. Further, in this embodiment, a ROM 403 storing necessary tables, various programs, and other fixed data used for predicting and correcting the end landing position, and a RAM 405 provided with an area for developing image data, a work area, and the like. Including. The host device 410 is a supply source of image data. Specifically, it may be in the form of a reader unit for image reading, in addition to a computer that creates and processes data such as images related to printing. Image data, other commands, status signals, and the like are transmitted / received to / from the controller 400 via an interface (I / F) 412. The operation unit 420 is a switch group that receives an instruction input from the operator. The operation unit 420 includes a power switch 422, a switch 424 for instructing start of printing, and a recovery switch 426 for instructing start of suction recovery. Further, a registration adjustment start switch 427 for manually performing various registration adjustments, a registration adjustment value setting input unit 429 for manually inputting the adjustment values, and the like are included. The sensor group 430 is a sensor group for detecting the state of the ink jet recording apparatus. The reflective optical sensor 130 described above, a temperature / humidity sensor 434 provided at an appropriate location for detecting environmental temperature and humidity, and the like. including.

  The head driver 440 drives the discharge heater 441 in the recording head 4 according to recording data or the like. The head driver 440 includes a shift register that aligns print data in correspondence with the position of the discharge heater 441 and a latch circuit that latches at appropriate timing. The head driver 440 includes a logic circuit element that operates the discharge heater 441 in synchronization with the drive timing signal, and a timing setting unit that appropriately sets the drive timing (discharge timing) for dot formation alignment. . The recording head 4 includes a sub heater 442. The sub-heater 442 performs temperature adjustment for stabilizing the ink ejection characteristics, and is formed on the recording head substrate at the same time as the ejection heater 441, or mounted on the main body of the recording head 4 or the head cartridge. can do. The motor driver 450 is a driver that drives the main scanning motor 452, the sub-scanning motor 462 is a motor that is used to transport (sub-scan) the recording medium P1, and the motor driver 460 is a driver that drives the motor 462. It is.

  Next, prediction and correction of the end landing position of the recording medium end region in the present embodiment will be described. FIG. 5 is a schematic diagram for explaining the ejection position after correcting the landing deviation in the end area of the recording medium. FIG. 5 is a schematic diagram at the left end (hereinafter referred to as BP side: back position side) of the recording medium. At the end of the recording medium, due to the negative suction pressure generated in the suction hole 9, the ink droplet ejected toward the target landing position D2 is drawn toward the center of the suction hole 9 and is expected to land on the expected landing position D3. . Therefore, it is possible to predict the amount of deviation from the expected landing position D3 from which the landing deviation is expected with respect to the target landing position D2, and finally discharge to the target landing position D2 by discharging at the corrected discharge position D1. It becomes possible. A deviation amount from the expected landing position D3 where a landing deviation is expected with respect to the target landing position D2 is a two-dimensional deviation in the main scanning direction of the carriage 16 and the intersecting sub-scanning direction. Note that the landing position shift direction in the main scanning direction is also reversed with respect to the right end portion (hereinafter referred to as HP side: home position side), but the same shift as the left end portion occurs.

  FIG. 6 is a schematic diagram for explaining the nozzle rows in the recording head 4. The recording head 4 of this embodiment is composed of 2576 nozzles whose nozzle pitch is arranged at an interval of 2400 dpi (dot / inch). Of these nozzles, a total of 16 nozzles, each having 8 nozzles at the upper and lower ends, are prepared as spare nozzles for adjustment. The nozzle length that can be recorded by one scan is 2560 nozzles. Further, the recording head 4 can correct the ejection timing by dividing the sub-scanning direction into 8 in order from N1 to N8 (in units of 320 nozzles). Furthermore, the correction resolution of the ejection timing can be changed in units of 4800 dpi (dot / inch). In other words, with respect to the landing deviation of the carriage 16 in the main scanning direction, it is possible to discharge in units of 4800 dpi (dot / inch) in each of the nozzle regions N1 to N8 in units of 320 nozzles. In the sub-scanning direction, which is the transport direction, it is possible to correct the ejection position by using the upper and lower spare nozzles of the nozzle row. Similarly in the sub-scanning direction, the ejection position can be corrected for each of the nozzle regions N1 to N8 obtained by dividing the nozzle row of the recording head 4 into eight. The correction resolution of the ejection position is the nozzle pitch of 2400 dpi (dot / inch), and the maximum shift amount is 8 nozzles. Although the number of divisions described above is eight in this embodiment, it goes without saying that the number of divisions can be increased or decreased as necessary.

  FIG. 7 is an end landing correction table for performing recording control by correcting landing position deviation. The table 1 in FIG. 7A, the table 2 in FIG. 7B, and the table 3 in FIG. 7C are each indicated by the amount of movement in dot units at each position of the recording dots where ink droplets can land. The table has different correction amounts. The correction parameter on the BP side of the table 2 in FIG. 7B will be described as an example. The reference numerals shown in FIG. 7 are the same as those described above, and correspond to those shown at both ends of the main scanning direction arrow and the sub scanning direction arrow shown in FIGS. FIG. 5 is a diagram in which the predicted landing position D3 where a deviation in landing is expected with respect to the target landing position D2 on the upstream side in the sub-scanning direction in FIG. 5 is in the sub-scanning direction on the left side (+ direction in the drawing) that is the main scanning direction. Deviation to the middle and lower side (+ direction in the figure) is expected. Therefore, the corrected ejection position D1 of the upstream nozzle region N1 is the right side (-direction in the figure) in the main scanning direction of the carriage 16 and the upper side (-direction in the figure) in the sub-scanning direction. That is, in the nozzle region N1, the ejection is performed at a position shifted in the main scanning direction by 2 dots (4800 dpi) -direction and at a position shifted by 2 dots (2400 dpi) -direction in the sub-scanning direction. As can be seen from FIG. 5, regarding the nozzle regions N4 and N5 near the center in the sub-scanning direction, a shift in the sub-scanning direction of the predicted landing position D3 with respect to the target landing position D2 is not expected, so the correction amount is zero. The main scanning direction correction values and sub-scanning direction correction values for N1 to N8 are set, including other nozzle areas not described above. On the HP side, since the end position of the recording material with respect to the ink suction hole 9 is reversed, the sign in the main scanning direction is also reversed. In FIG. 7, only the BP side and the HP side are illustrated, but the correction amount may be set for all landing positions that can be recorded by the recording head.

  FIG. 8 is a flowchart showing a procedure for determining the end edge landing correction table. FIG. 9 is a diagram illustrating a correspondence table in which a parameter that affects the landing position of an ink droplet is associated with a correction table. In S1 of FIG. 8, the user inputs the type of the recording medium from the main body panel (not shown) when setting the desired recording medium. Next, in S2, a temperature and humidity sensor 434 installed on the main body of the ink jet recording apparatus detects the temperature and humidity at the time of setting and stores them in the main body. In S3, the fan rotation speed of the negative pressure generator 6 is determined by the combination of the type of recording medium and the temperature and humidity. Similarly, in S4, the height of the recording head 4 is determined by the combination of the type of recording medium and the temperature and humidity. Next, in S5, the carriage 16 is moved in the main operation direction, and the positions of both end portions of the recording medium are detected by the optical sensor 20 attached to the carriage 16. That is, the width of the recording medium is detected. When the information affecting the ink droplet landing position is acquired, the end landing correction table selection table shown in FIG. 9 stored in the main body in S6 is shown in FIGS. 7A to 7C. The end landing correction table shown is determined. With respect to the recording medium width shown in FIG. 9, “small” is applied to a width less than approximately half of the main body recording area width, and “large” is applied to a width of approximately half or more. When the recording medium width is “small” with respect to the landing position deviation amounts at the left and right ends of the recording medium, the area on which the recording medium is adsorbed becomes smaller than the area of the recording medium adsorption unit 5, so The air leaks from 5, and the negative pressure suction force becomes small. Therefore, the amount of landing position deviation at the left and right ends of the recording medium is also smaller than when the recording medium width is “large”. Further, when the fan rotation speed of the negative pressure generating unit 6 is high, the negative pressure suction force increases, and the landing position deviation amount at the left and right ends of the recording medium increases. In addition, when the height of the recording head 4 is high, even if the negative pressure suction force generated at the left and right ends of the recording medium is the same, the distance from the recording head 4 to the recording medium is increased, so that the amount of landing position deviation increases. The end edge landing correction table is determined in consideration of the above phenomenon. For example, when the recording medium width is “large”, the fan rotational speed is high, and the recording head height is high, the landing position deviation amount at the left and right ends of the recording medium is the largest. Therefore, the table 3 having the largest correction amount in FIGS. 7A to 7C is determined. Similarly, an optimal table can be set for other combinations, and end landing position correction is performed. Regarding the tables described above, the number of tables is 3 in the present embodiment, but it goes without saying that the number of tables can be increased or decreased as necessary. When the table is determined, printing is performed by controlling the drive timing of the print head according to the table.

  In this embodiment, the scanning speed of the carriage 16 in the end area of the recording medium may be set slower than the scanning speed of other recording areas. It is known that when the scanning speed of the carriage 16 is slowed, the dot shape of the ink droplets that land on the recording medium edge region is more stable and close to a perfect circular shape. It is known that a droplet is divided into fine dots. When divided into fine dots, there is a possibility that the landing position deviation due to the suction negative pressure from the ink suction hole 9 varies. That is, it will deviate from the correction amount of the table set in FIG. Therefore, by setting the scanning speed of the carriage 16 in the end area of the recording material to be slower than the scanning speed of the other recording areas, more optimal end landing position correction is performed. It is also possible to provide a configuration in which the scanning speed of the carriage 16 in the end area of the recording medium is set slower than the scanning speed of the other recording areas so as to perform recording in the acceleration / deceleration area. As described above, by performing the edge landing correction according to the present embodiment, it is possible to perform recording with no back-dirt or paper floating and without landing position deviation. As a result, it is possible to provide an ink jet recording apparatus capable of obtaining a good image.

[Example 2]
Hereinafter, description of the same configuration as that of the above-described embodiment will be omitted. Next, the flow path (transmission path) configuration for sucking the recording medium adsorbing unit 5 and the ink suction / recovery units 8a to 8d (FIG. 10) in the ink jet recording apparatus of the present embodiment will be described with reference to the drawings. 10 and 11 are schematic views showing the flow path from the suction in the platen 3 to the exhaust outside the apparatus through the negative pressure generator 6. Each suction hole 7 for generating a negative pressure in the recording medium suction portion 5 to suck the recording medium P1 is connected to the recording medium suction flow path A below the platen 3, and is constantly connected to the negative pressure generation portion 6. It is communicated. Each of the ink suction / recovery units 8a to 8d provided at the left and right ends of each recording medium width is connected to the ink suction / recovery channel B, and after joining the recording medium adsorption channel A at the junction unit 11, negative pressure is generated. Suctioned by part 6. The merging portion 11 of the recording medium adsorption flow path A and the ink suction / collection flow path B is provided with a shutter 12 that is automatically opened and closed by the actuator 21 via the drive transmission portion 22, and the opening cross-sectional area of the merging portion 11 is fully closed. It can be continuously changed to the fully open state. The air sucked by the negative pressure generator 6 is exhausted outside the inkjet recording apparatus through the filter 13.

  Next, test pattern processing performed for correcting the landing position in the recording medium end region will be described. FIG. 12 is a flowchart showing a procedure of processing for performing the end landing correction using the test pattern. FIG. 13 is a schematic enlarged view for explaining a test pattern patch generation method. Here, as an example, the processing in the state where the recording medium width shown in FIG. 7 is “large”, the fan rotation speed is low, and the recording head height is low will be described. First, in S11, a test pattern instruction by the user is input from the main body panel. At this time, the recording medium type is also input at the same time. At this time, the end landing correction table shown in FIG. 7 is provisionally determined based on the determination flow shown in FIG. 8 and the end landing correction table selection table shown in FIG. Assume that table 1 is provisionally determined this time. Next, in S12, the shutter 12 is closed, so that no suction negative pressure is generated in the ink suction collection units 8a to 8d. In this state, in S13, the first test patch is recorded on both end regions of the recording medium (an example of first test recording). FIG. 13A is an enlarged schematic diagram for explaining the first test pattern recording, and specifically shows the ejection dot position on the upstream side in the sub-scanning direction on the BP side. Specifically, in FIG. 13, dots 1201a are ejected at equal intervals as shown in the enlarged region 1203a. In addition, the dashed-dotted line in a figure is a reference line, and has shown the same position in the expansion area | region 1203-1205 of FIG. Next, in step S14, a negative suction pressure is generated in the ink suction / collection units 8a to 8d by opening the shutter 12. In this state, the second test patch is recorded on both end regions of the recording medium in S15 (an example of second test recording). In this case, a correction amount table having a small one-step correction amount is determined from the end landing correction table determined at the time of S11 (an example of determination of the second correction table), and a test patch is recorded using the table. However, if a table having a correction value smaller than that of Table 1 cannot be set, the second test patch is recorded without correction. Specifically, in FIG. 13, dots 1202a are ejected at regular intervals as shown in the enlarged region 1204a. Next, in step S16, the recording medium is conveyed in the sub-scanning direction, that is, a state in which the second test pattern recording can be performed on the recording medium end region different from the recording in steps S12 and S15. In S17, S12 to S16 are repeated and the third test pattern recording is performed. In each of the total three test pattern recordings, the first test patch is ejected at the same position every time. Regarding the ejection position of the second test patch, the table 1 temporarily determined in S11 is determined as the end landing correction table for the second time. In the third time, the table 2 having a one-step correction amount larger than the temporarily determined table is determined (an example of determining the first correction table), and discharge is performed at each corrected discharge position. In the enlarged region 1204b, a state in which dots are discharged in a state corrected to the upper right from the reference one-dot chain line is shown, and in the enlarged region 1204c, a state in which the dots are further corrected to the upper right is shown. Next, the optimum edge landing correction table is determined by reading the image density of the test pattern obtained by superimposing the first test patch and the second test patch with the optical sensor 20 in S18. Specifically, the determination is performed by measuring and comparing the image density per unit area such as the enlarged regions 1205a to 1205c in FIG. Since the amount of deviation between the first test patch and the second test patch in the enlarged area 1205a is relatively large, the area of the dots 1201a and 1202a per unit area is large, so the density is high. Compared to this, the density of the enlarged area 1205b is slightly lower, and in the enlarged area 1205c, since the dots 1201a and 1202b are almost overlapped, the density is lowered. Therefore, the table 2 is an optimum end landing correction table. Next, in S19, the end landing correction table is determined. In this case, the table in the case where the recording medium width is “large”, the fan rotational speed is low, and the recording head height is low among the end landing correction table selection table shown in FIG. To table 2 and stored in the main body.

  The number of test pattern recording repetitions described above is not limited to three, and may be increased or decreased as necessary. Further, the test table recording is performed a plurality of times by changing the fan rotation speed of the negative pressure generating unit 6 and the height of the recording head 4, thereby rewriting a plurality of correction tables determined in the end landing correction table selection table of FIG. It becomes possible. Therefore, the optimum edge landing correction table can be determined even when the rotational speed of the fan is changed or the height of the recording head 4 is changed when the temperature and humidity environment is changed.

  As described above, by performing the test pattern recording of the present embodiment, a more optimal end landing correction can be performed. Therefore, it is possible to perform recording with no landing position deviation in a state where there is no back dirt or paper floating. As a result, it is possible to provide an ink jet recording apparatus capable of obtaining a good image.

[Example 3]
The description of the same configuration as that of the above-described embodiment is omitted. In the above description, the mode in which test pattern recording is performed to correct the landing position in the edge area of the recording medium by switching the suction negative pressure of the ink suction recovery units 8a to 8d by the shutter 12 has been described. An embodiment relating to correction of a roll-shaped recording material outside the fixed form will be described below.

  FIG. 14 is a flowchart showing a processing procedure for recording the test pattern on the cut recording material and correcting the end landing. First, in S21, a test pattern instruction by the user is input from the main body panel. At this time, a desired roll type recording medium type and width are simultaneously input. At this time, the end landing correction table shown in FIG. 7 is provisionally determined based on the determination flow shown in FIG. 8 and the end landing correction table selection table shown in FIG. Next, the cut recording medium used in S22 is set. This is because, by using a cut recording medium instead of a desired roll recording medium, the fan of the negative pressure generating unit 6 does not operate and does not float and does not become an unrecordable load. As the type of recording medium, a glossy recording medium is desirable. A glossy cut recording medium has little curl or the like, and does not float even when no negative pressure is applied to the platen. After recording the first test patch in the both end regions of the recording medium in S23, the fan of the negative pressure generating unit 6 is rotated at a predetermined rotational speed in S24. Next, in S25, the second test patch is recorded in both end regions of the recording medium. In step S26, the recording medium is conveyed in the sub-scanning direction so that the second test pattern recording can be performed in the end area of the recording medium. In S27, S23 to S26 are repeated and the third test pattern recording is performed. Next, the optimum edge landing correction table is determined by reading the image density of the test pattern in which the first test patch and the second test patch are overlapped by the optical sensor 20 in S28. Next, in S29, the end landing correction table is determined. Next, in S30, the cut recording medium is discharged, and a desired roll-shaped recording material can be set. As described above, by performing the test pattern recording of the present embodiment, the optimum edge landing correction can be performed even on a roll-shaped recording material other than the fixed form, and recording without any landing position deviation is possible. As a result, it is possible to provide an ink jet recording apparatus capable of obtaining a good image.

(Other examples)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (7)

An ink jet recording apparatus having suction means for adsorbing a recording medium to a platen and performing recording on the recording medium by scanning a recording head based on recording data;
An acquisition unit that acquires a parameter that affects a landing position of an ink droplet from the recording head to the recording medium when the recording medium is adsorbed to the platen by the suction unit;
Determination that the correction amount of the landing position is determined based on the parameters acquired by the acquisition unit from a plurality of correction tables determined for the scanning direction of the recording head and the conveyance direction for conveying the recording medium. Means,
The recording medium is adsorbed to the platen, the drive timing of the recording head is controlled so that the landing position is corrected according to the correction table determined by the determining means, and the recording medium is based on the recording data. An ink jet recording apparatus comprising: a recording control unit that performs recording on the recording medium.   2. The ink jet recording apparatus according to claim 1, wherein the parameters include a width of the recording medium, a rotational speed of a fan that is the suction unit, and a distance between the recording head and the recording medium. . A correspondence table in which a combination of the width of the recording medium, the rotational speed of the fan, and the distance, and any one of the plurality of correction tables is associated;
The inkjet recording apparatus according to claim 2, wherein the determination unit determines one from the plurality of correction tables according to the correspondence table. The correction table defines the correction amount for each position where it can land on the recording medium,
4. The inkjet recording apparatus according to claim 1, wherein the correction amount is represented by a movement amount of a dot unit in each of the scanning direction and the transport direction. 5. The determination unit is configured to set a correction amount of the landing position based on the parameter acquired by the acquisition unit from a plurality of correction tables determined for each of a scanning direction of the recording head and a conveyance direction for conveying the recording medium. Tentatively decide
The ink jet recording apparatus comprises:
A sensor for reading a recording dot on the recording medium;
First correction table determination means for determining a first correction table having a correction amount larger than the correction amount determined for each position of the correction table provisionally determined by the determination means from the plurality of correction tables; ,
Second correction table determination means for determining a second correction table having a correction amount smaller than the correction amount determined for each position of the correction table provisionally determined by the determination means from the plurality of correction tables; ,
First test recording means for performing recording on separate recording media without adsorbing to the platen in accordance with the correction table provisionally determined by the determination means, the first correction table, and the second correction table. When,
In accordance with the correction table provisionally determined by the determination means, the first correction table, and the second correction table, recording on the recording medium recorded by the first test recording means is performed on the platen. Second test recording means to be adsorbed on
The recording dot on each recording medium recorded by the second test recording means is read by the sensor to measure the density per unit area of the recording dot, and which recording medium has the lowest density And a determination means for determining
The recording control unit is configured to perform recording according to any one of the correction table, the first correction table, and the second correction table used for the recording medium determined to have the lowest density by the determination unit. 5. The recording on the recording medium is performed based on the recording data by controlling the driving timing of the recording head so that the medium is attracted to the platen and the landing position is corrected. 2. An ink jet recording apparatus according to 1. The suction means generates a suction force for adsorbing the recording medium to the platen, and is located below the platen via a transmission path for transmitting the suction force;
The inkjet according to any one of claims 1 to 5, wherein the transmission path is configured to transmit the suction force in a range wider than a width of the recording medium in the transport direction. Recording device. A recording control method executed in an ink jet recording apparatus that has a suction unit for adsorbing a recording medium to a platen, scans a recording head based on recording data, and performs recording on the recording medium,
Parameters that affect the landing position of ink droplets from the recording head to the recording medium when the acquisition unit of the ink jet recording apparatus performs the recording by attracting the recording medium to the platen by the suction unit. An acquisition process to acquire;
The determination unit of the ink jet recording apparatus has a plurality of landing position correction amounts determined in each of the scanning direction of the recording head and the conveyance direction for conveying the recording medium based on the parameter acquired in the acquisition step. A determination step of determining one from the correction table;
Recording control means of the ink jet recording apparatus controls the drive timing of the recording head so that the recording medium is attracted to the platen and the landing position is corrected according to the correction table determined in the determining step. And a recording control step of recording on the recording medium based on the recording data.

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