JP2016150441A - Inkjet recording device and recording method - Google Patents

Abstract

In double-sided recording in an ink jet recording apparatus that conveys a sheet while adhering, the difference in image quality between the front and back surfaces of the sheet is reduced. In double-sided recording, ejection amount correction data for the surface is read from a RAM (S302). Next, the sheet is fed and conveyed through the fixed conveyance unit, and ink is ejected according to the recording data with the ejection amount corrected by the ejection amount correction data for the surface of each of the C, M, and Y recording heads and recorded. (S303). When the recording on the surface of the sheet is completed, the sheet is reversed and conveyed to the fixed conveyance unit (S304). Next, the discharge amount correction data for the back surface is read from the RAM (S305). Then, the sheet is conveyed through the fixed conveyance unit, and the recording is performed by ejecting ink according to the recording data with the ejection amount corrected by the ejection amount correction data for the back surface for each of the recording heads of C, M, and Y inks ( In step S306, the paper is discharged (S307). [Selection] Figure 4

Description

  The present invention relates to an ink jet recording apparatus and a recording method, and more particularly, to a recording apparatus that holds and conveys a sheet by an adhesive surface of a conveyance belt.

  2. Description of the Related Art Conventionally, there is known a recording apparatus that conveys a sheet while being held by an adhesive surface of a conveyance belt and records on the conveyed sheet (Patent Document 1). Specifically, one surface of the sheet as a recording medium is in contact with the adhesive surface of the conveyance belt, and the sheet is attached to the conveyance belt by the adhesiveness. Then, recording is performed by discharging ink from the recording head to the other surface of the sheet.

JP-A-8-26588

  Incidentally, some recording apparatuses perform so-called double-sided recording, in which recording is performed on both sides of a sheet. When the double-sided recording is performed by the above-described configuration in which the sheet is held on the conveyance belt by the adhesiveness, the image quality such as the color of the sheet on which the double-sided recording may be different between the front surface and the back surface. . In this case, there arises a problem that a constant image quality cannot be maintained in double-sided recording.

  For example, when the surface of the sheet attached to the adhesive conveyance belt is peeled off from the adhesion surface of the conveyance belt, the fiber state of the surface may slightly change due to stress acting on the surface. In addition, when silicon rubber or the like is used as a member constituting the adhesive surface, oil from the adhesive member may adhere to the sheet although it is a small amount. Thus, in the sheet, the surface may be different between the surface that has already adhered to the belt and the surface that has not yet adhered. On the other hand, in particular, in the ink jet recording method, when the sheet state changes due to changes in the oil component or fiber state, the surface tension of the landing ink is relatively different, for example, the degree of bleeding of the formed ink dots is different. The final difference in image quality.

  In double-sided recording, a sheet fed from a sheet feeding unit is recorded on the first side (front side), and the sheet is reversed and then recorded on the second side (back side). Recording is performed on the surface that has not yet adhered to the belt, and then recording is performed on the surface that has already adhered to the belt. As a result, a difference in image quality may occur between the first surface and the second surface.

  SUMMARY An advantage of some aspects of the invention is to provide an ink jet recording apparatus and a recording method capable of reducing a difference in image quality between the front and back surfaces of a sheet in double-sided recording.

  Therefore, the present invention is an ink jet recording apparatus that includes a transport belt having an adhesive surface, transports the sheet while holding the sheet on the adhesive surface of the transport belt, and performs recording on the transported sheet. When recording on both sides of the sheet, acquisition means for acquiring recording control information when recording on each of the first side and the second side of the sheet, and conveying the sheet while holding the second side with the adhesive side When recording on the first surface of the sheet, the recording is controlled according to the recording control information of the first surface, and after the recording of the first surface of the sheet is performed, the first surface is held by the adhesive surface And recording control means for controlling recording according to the recording control information on the second surface when the sheet is conveyed and recorded on the second surface of the sheet.

  According to the above configuration, it is possible to reduce the difference in image quality between the front and back surfaces of the sheet in the double-sided recording in the ink jet recording apparatus that transports the sheet while sticking.

1 is a diagram illustrating a configuration for mainly sheet conveyance of an ink jet recording apparatus according to an embodiment of the present invention. FIG. FIG. 2 is a block diagram illustrating a configuration of a control system of the recording apparatus illustrated in FIG. 1. It is a figure which shows the adjustment pattern recorded in order to obtain | require the discharge amount correction data of each of C, M, and Y ink. It is a flowchart which shows recording control.

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

  FIG. 1 is a diagram showing a configuration mainly for sheet conveyance of an ink jet recording apparatus according to an embodiment of the present invention. In FIG. 1, a conveyor belt 101 is configured by endlessly forming a belt having adhesive rubber formed on the surface thereof. In other words, an adhesive surface is formed on the surface of the conveyor belt 101 on which the sheet abuts, so that the conveyor belt 101 can convey the sheet while holding the sheet. The conveyor belt 101 is stretched around an upstream belt drive roller 102 and a downstream belt driven roller 103, and can travel (move) by rotationally driving the upstream belt drive roller 102. Sheets (not shown) are fed from the sheet feeding unit by the pair of sheet feeding rollers 106 and 107 and are sequentially attached to the conveying belt 101 by the adhesive fixing roller 106 as the sheet is fed. Ink is ejected from the recording head 104 in accordance with the recording data on the sheet held on the conveying belt 101 by this pasting, and recording is performed. The recording head 104 of the present embodiment is a line type recording head in which a plurality of nozzle rows are fixed and arranged in a direction orthogonal to the sheet conveyance direction. The application of the present invention is not limited to this form, and may be a form of a serial type recording head that scans the recording head by moving the carriage in a direction orthogonal to the sheet conveyance direction and sequentially records on the sheet. In this embodiment, the recording head 104 includes four nozzle rows that respectively eject four colors (types) of black (K), cyan (C), magenta (M), and yellow (Y). . A drying and fixing unit 113 is provided downstream of the recording head 104 in the conveyance path, whereby the sheet surface of the sheet can be dried and ink can be fixed. As a drying method, a hot air drying method in which an electric heater and a blower are combined, a method using an infrared lamp, a method in which a heat roller is pressed, or the like can be used.

  In the above configuration, the paper feed roller 107 and the paper feed follower roller 106 feed the sheet to the recording unit by the recording head 104 by sandwiching and rotating the sheet. At that time, the sheet fed by the sheet feeding roller 107 and the sheet feeding driven roller 106 is adhesively fixed to the conveying belt 101 by the adhesive fixing roller 105. After the image is recorded on the sheet by the recording head 104, the sheet is peeled off at the bent portion of the conveyor belt 101 on the belt driven roller 103 side and conveyed in cooperation with the downstream roller 109 and the downstream driven roller 108.

  The recording apparatus of this embodiment can execute both single-sided recording and double-sided recording by switching the recording mode. In the present specification, the above-described conveyance path in which the sheet is conveyed in any one mode of single-sided recording and double-sided recording, that is, a conveyance path in a section conveyed by the conveyance belt 101 is referred to as a “fixed conveyance unit”.

  In FIG. 1, there is a paper path branching portion downstream of the downstream roller 108. In the case of single-sided recording, the sheet is discharged by a paper path switching mechanism (not shown). On the other hand, in the case of double-sided recording, the front and back surfaces of a sheet are reversed by a sheet reversing mechanism. Specifically, first, the sheet is guided to the reverse conveyance path 110 by a paper path switching mechanism (not shown). Then, after the sheet is conveyed from the reversal conveyance path 110 to the reversal buffer 111, the sheet temporarily stops and performs a switchback operation and is guided to the reversal conveyance path 112 by a paper path switching mechanism (not shown). Further, the sheet is conveyed along the reverse conveying path 112 and is guided to the nip portion between the sheet feeding roller 107 and the sheet feeding driven roller 106 at the end of the conveying path. As a result, the sheet is fed to the conveyor belt 101 in an inverted state where the back side of the front surface of the sheet is the front surface when the sheet is conveyed through the fixed conveyance unit before it is adhesively fixed to the conveyance belt 101. The

  FIG. 2 is a block diagram showing the configuration of the control system of the recording apparatus shown in FIG. In FIG. 2, a CPU 601 executes a control program stored in a ROM 602, and performs drive control and data processing of each mechanism in the recording apparatus, such as processing described later in FIG. At that time, the RAM 603 is used as a work area. Further, the CPU 601 controls driving of the paper feed motor 607, the transport belt motor 609, the paper discharge motor 611, and the paper path switching mechanism motor 613 via the motor drivers 606, 608, 610, and 612, so that each transport described above is performed. The sheet is conveyed on the road. Further, the recording head 104 is driven via the head driver 604 to eject ink onto the sheet. Further, image data to be recorded is given from the host computer 616 or an image input mechanism such as a scanner (not shown), and stored in the RAM 603 for use. When the host computer 616 is instructed to execute a recording operation, data such as a recorded image and recorded image quality is transmitted via the I / F 615 to communicate with the CPU 601.

  Next, sheet conveyance during double-sided recording and single-sided recording by the sheet conveying mechanism shown in FIG. 1 will be described. In FIG. 1, in double-sided recording, a sheet is fed in a direction indicated by an arrow A from a sheet feeding unit (not shown). And while conveying a fixed conveyance part, it records on the surface (1st surface) of a sheet | seat. Then, the sheet that has passed through the fixed conveyance unit is conveyed in the direction indicated by the arrow B. Further, after the sheet is conveyed in the direction indicated by arrow C, the sheet is temporarily stopped and conveyed in the direction indicated by arrow D. As a result, the sheet is reversed. Thereafter, the sheet is conveyed in the directions indicated by arrows E and F, respectively, and the reversed sheet is guided again to the fixed conveyance unit. Then, the sheet is conveyed through the fixed conveyance unit, and recording is performed on the back surface (second surface) of the sheet. The sheet on which both surfaces are recorded is conveyed in the arrow G direction and discharged to a discharge stacker (not shown) or the like. .

  On the other hand, in the case of single-sided recording, the sheet is fed in the direction of arrow A from a paper feeding mechanism (not shown) as in the case of recording on the front side of double-sided recording. Similarly, after the front surface is recorded by the fixed conveyance unit, the sheet is conveyed in a direction indicated by an arrow G and discharged to a discharge stacker or the like.

  Next, an embodiment of double-sided recording, in particular, using the transport mechanism and recording mechanism according to the embodiment of the present invention described above will be described.

(First embodiment)
In the first embodiment, ejection from the recording head is performed when recording is performed on the front surface (first recording surface; first surface) of the sheet and when recording is performed on the rear surface (back surface of the front surface; second surface). By correcting the amount, the difference between the color of the image recorded on the front surface and the color of the image recorded on the back surface is reduced. As described above, the sheet is held by the pressure-sensitive adhesive surface of the conveyor belt and then peeled off, resulting in a change in the fiber state of the sheet. The recording state with ink is different from the surface to be recorded. As a result, the color may be different. In order to cope with this, the discharge amount of each of the cyan (C), magenta (M), and yellow (Y) recording heads is corrected so that the color of the recorded image is the same between the front surface and the back surface. To do.

  The ejection amount correction data for each of the C, M, and Y inks is obtained in advance for each of the front and back surfaces, and stored in the RAM 603 (FIG. 2). Then, at the time of recording, discharge amount correction data corresponding to the surface to be recorded (front surface or back surface) is acquired, and the discharge amount of each of the C, M, and Y ink recording heads is corrected using the data.

  FIG. 3 is a diagram showing adjustment patterns that are recorded in order to obtain ejection amount correction data for C, M, and Y inks. The adjustment pattern is formed by recording a pattern having a predetermined density (duty) indicated by the image data of each of the C, M, and Y inks. At that time, the patterns 21, 22, 23,... Are formed on a plurality of sets of CMY ink discharge amounts in which the discharge amounts of the C, M, and Y inks in the recording head 104 are changed stepwise by a certain amount. Record in S. The ejection amount is changed by changing the voltage pulse applied to the electrothermal converter (ejection heater) of the recording head, that is, the applied energy by a predetermined amount from the design nominal value. Next, these patterns are read by a scanner device (not shown), and each color is measured. Among these measured colors, a pattern having a color closest to a predetermined reference color in which C, M, and Y inks are balanced is selected, for example, the pattern 22 in FIG. The adjustment pattern is formed and the color pattern closest to the reference color is selected for both the front surface (first surface) and the back surface (second surface) of the sheet. Then, discharge amount correction data for C, M, and Y inks corresponding to the patterns selected for each of the front and back surfaces are determined, and each set is set as discharge amount correction data (discharge amount information) for the front and back surfaces. Stored in the RAM 603.

  Next, double-sided recording using the front surface and back surface ejection amount correction data obtained as described above will be described. FIG. 4 is a flowchart showing recording control according to the first embodiment.

  In FIG. 4, first, in step 301, it is determined whether the recording mode is a duplex recording mode or a simplex recording mode. If it is determined that the double-sided recording is selected, the ejection amount correction data for the front surface is read from the RAM 603 at step 302. Next, in step 303, the sheet is fed and transported through the fixed transport unit, and the inks according to the recording data are discharged with the discharge amounts corrected by the surface discharge amount correction data for each of the C, M, and Y recording heads. Discharge and record. When the recording on the surface of the sheet is completed, in step 304, the sheet is turned upside down by the reversing mechanism described above with reference to FIG.

  Next, in step 305, the ejection amount correction data for the back surface is read from the RAM 603. In step 306, the sheet is conveyed through the fixed conveyance unit, and ink is ejected according to the recording data with the ejection amount corrected by the ejection amount correction data for the back surface for each of the C, M, and Y ink recording heads. In step 307, the paper is discharged.

  When it is determined in step 301 that single-sided recording is performed, in steps 308 and 309, discharge amount correction data is acquired and recording based on the same is performed as in steps 302 and 303 in the case of double-sided recording.

  As described above, in both-side recording, when recording on each of the front surface and the back surface of the sheet, it is possible to perform discharge amount correction corresponding to the state of each surface. Thereby, in particular, the discharge amount corresponding to the state where the back surface of the sheet is once adhered and held by the adhesive material of the transport belt and then peeled off can be reduced, and the difference in color between the front surface and the back surface can be reduced. It becomes.

(Second Embodiment)
The first embodiment described above reduces the difference in color between the front and back surfaces by selecting a set of C, M, and Y ink discharge amounts suitable for the front and back surfaces of the sheet. However, application of the present invention is not limited to this form. The second embodiment of the present invention adjusts the size of the dots formed on the sheet by appropriately setting the discharge amount of each of the C, M, and Y inks in the front surface recording and the back surface recording, The difference between the front and back of the grain is prevented.

  In particular, when recording on the back side of the sheet, the sonosheet is once adhered and held by the adhesive material of the belt, so that the state of the surface of the sheet changes. For this reason, the way the ink ink that has landed on the sheet changes, the dot diameter changes accordingly, and as a result, the granularity of the recorded image differs from that of the surface. Therefore, in the same manner as described in the first embodiment, the discharge amounts of the C, M, and Y inks are made different between the front and back sides of the sheet, and the diameters of the formed dots are made different. Specifically, the discharge amount is smaller in the back side recording. Thereby, it can suppress that the dot diameter formed with respect to the state where the sheet | seat surface is easy to bleed under the influence of adhesion | attachment becomes large.

  As described above, according to this embodiment, it is possible to reduce the difference in graininess between images recorded on the front and back surfaces of a sheet.

(Third embodiment)
In the form of the sheet holding by the adhesive material of the conveyance belt, the surface state after the sheet is peeled off may be different depending on the time during which the conveyance belt is adhesively held. For example, there is a form in which a plurality of recording speeds (conveyance speeds) can be set as a recording mode corresponding to the recording quality. In such a case, the adhesive holding time varies depending on the recording speed. When the time during which the adhesive is held is different, the state of the surface of the sheet is further different depending on the time for holding the adhesive, such as a slight change in the degree of oil adhesion to the holding surface of the sheet.

  In the present embodiment, the recording control information of the first and second embodiments described above is changed according to the sheet conveyance speed during recording, that is, the time during which the sheet is held on the conveyance belt. For example, the longer the time that the sheet is held on the conveyance belt, the greater the ejection correction amount of each ink, and the smaller the ejection amount.

  In addition, as a time for the sheet to stay on the conveyance belt, some maintenance may occur, and the sheet may stay on the adhesive belt for a while. In this case, it is preferable that only the retained sheet can be forcibly discharged. As a result, it is possible to avoid recording in a situation where the range of color and the like exceeds the adjustable range.

  As described above, by setting different recording control information for recording on the front side and back side of the sheet, it is possible to reduce the difference in recording image quality between the front and back sides of the sheet transported by the transport belt that holds adhesive. It becomes.

DESCRIPTION OF SYMBOLS 101 Conveying belt 104 Recording head 105 Adhesive fixing roller 106 Paper feed roller 107 Paper feed driven roller 108 Downstream roller 109 Downstream driven roller 110 Reverse sheet branch path 111 Reverse buffer 112 Reverse transport path 601

Claims (5)

An inkjet recording apparatus comprising a conveyance belt having an adhesive surface, conveying the sheet while holding the sheet on the adhesive surface of the conveyance belt, and performing recording on the conveyed sheet,
When recording on both sides of the sheet, an acquisition means for acquiring recording control information when recording on each of the first side and the second side of the sheet;
When the sheet is transported and recorded on the first surface of the sheet while the second surface is held by the adhesive surface, the recording is controlled according to the recording control information on the first surface, and the recording on the first surface of the sheet is performed. After the recording is performed, a recording control unit that controls recording according to the recording control information of the second surface when conveying the sheet while recording the second surface of the sheet while holding the first surface with the adhesive surface When,
An ink jet recording apparatus comprising:   The recording control information is information on a combination of ejection amounts of a plurality of types of ink ejected by the recording head, and the combination information on the ejection amounts on the first surface and the second surface is based on the same data, 2. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is determined so that a difference between a color recorded on the first surface and a color recorded on the second surface is small.   The recording control information is information on the ejection amount of ink ejected by the recording head, and the ejection amount information on each of the first surface and the second surface is formed on the first surface based on the same data. 2. The ink jet recording apparatus according to claim 1, wherein a difference between a diameter of an ink dot and a diameter of an ink dot formed on the second surface is determined to be small.   The inkjet recording apparatus according to claim 1, wherein the recording control unit changes and uses the recording control information according to a time during which the sheet is held on the conveyance belt. A recording apparatus for providing a conveyance belt having an adhesive surface, conveying the sheet while holding the sheet on the adhesive surface of the conveyance belt, and performing recording on the conveyed sheet,
When recording on both sides of the sheet, obtain recording control information when recording on each of the first and second sides of the sheet,
When the sheet is transported and recorded on the first surface of the sheet while the second surface is held by the adhesive surface, the recording is controlled according to the recording control information on the first surface, and the recording on the first surface of the sheet is performed. Is performed, the sheet is conveyed while holding the first surface with the adhesive surface, and when recording on the second surface of the sheet, the recording is controlled according to the recording control information of the second surface,
And a recording method.