JP2004216749A - Inkjet recording device and recording method using this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording device which maintains a gap between a recording medium and a head even when the recording medium is an envelope, and increases an image region, and to provide a recording method. <P>SOLUTION: The inkjet recording device has an engagement member 24 which is engaged with a face of a recording means 13 side of the recording medium at the downstream side of the recording means 13 in a transfer direction A of the recording medium by a transfer means 12. When the recording medium is the envelope, discharge of ink to the envelope from a discharge opening 29 is started in a state in which a leading end at the downstream side of the envelope in the transfer direction A is engaged with the engagement member 24. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording method using an ink jet recording apparatus and an ink jet recording apparatus, and more particularly to a recording method and an ink jet recording apparatus that perform recording by a specific method when a recording medium is an envelope.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an inkjet recording apparatus that performs recording by an inkjet method has been known. In pursuit of higher image quality in an ink jet recording apparatus, it is necessary to precisely position ink droplets on a paper, and it is necessary to improve a gap between a head for ejecting ink droplets and the surface of the paper and a flatness of the paper. There is.
[0003]
Therefore, as described in [Patent Document 1], a conventional ink jet recording apparatus is provided with a guide plate disposed opposite to an ink head and a spur having a protrusion on the periphery as a presser for a sheet. There is a printer that performs printing on a sheet conveyed on a guide plate while forcibly pressing the sheet. However, if the paper is forcibly pressed by the spur, the image may be scratched by the spur.
[0004]
Further, in a conventional ink jet recording apparatus, as described in Japanese Patent Application Laid-Open No. H11-157, the paper is fed by rollers, and two pairs of rollers are provided so as to sandwich a printing area. The pair of rollers on the downstream side in the sheet conveyance direction with the print area interposed therebetween is constituted by the above-described spurs and rollers that contact the spurs. In this configuration, the paper feeding accuracy can be guaranteed only when the printing paper is engaged with each of the two rollers.
[0005]
However, in recent years, since it has been desired to increase the image printing area, in order to secure this printing area, a state in which the paper feeding accuracy cannot be guaranteed originally, that is, one of the two roller pairs Some printers perform printing in a state where paper is only bitten. Of course, in such an ink jet recording apparatus, in the state where the paper is bitten by only one of the roller pairs, if the floating of the paper occurs, the floating cannot be eliminated, and the paper comes into contact with the nozzle surface of the head, In addition to the problem that the nozzle surface is soiled and the paper itself is also soiled, the accuracy of feeding cannot be guaranteed because the paper conveyance force cannot be ensured, and further, the image quality deteriorates.
[0006]
Therefore, as described in [Patent Document 2], an endless belt for conveying a sheet and a charging unit for charging the endless belt are provided, and the sheet is conveyed by being electrostatically attracted to the endless belt. 2. Related Art An ink jet recording apparatus for performing recording has been proposed. In this type of ink jet recording apparatus, the sheet is conveyed in a state of being electrostatically attracted to the endless belt, so that the portion of the sheet which comes into contact with the endless belt is prevented from floating, and the sheet conveying force is secured.
[0007]
[Patent Document 1]
JP 2000-21768 A
[Patent Document 2]
JP-A-5-518
[0008]
[Problems to be solved by the invention]
However, some inkjet recording apparatuses perform recording not only on normal paper but also on envelopes. When recording on envelopes, the paper described in [Patent Document 2] is electrostatically attracted and conveyed. Even when the endless belt plate is provided, the portion where the recording of the envelope is performed is not electrostatically attracted to the endless belt, but floats from the portion which is electrostatically attracted to the endless belt. Also, due to its shape, the envelope is less likely to be electrostatically attracted to the endless belt than ordinary paper, which also causes the envelope to float from the endless belt.
[0009]
When recording is performed in such a state, the accuracy of the gap between the head and the surface of the envelope decreases, and the recording accuracy, that is, the printing accuracy, decreases. The surface may be soiled, and the envelope itself may be soiled. Further, just because there is such a problem, as described in [Patent Document 2], two pairs of rollers are simply provided with a print area interposed therebetween, and an envelope is provided for each of the two pairs of rollers. If the recording is performed in a biting state, it is not possible to increase the image printing area which has been desired in recent years.
[0010]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink jet recording apparatus and a recording method for maintaining a gap between a recording medium and a head even when the recording medium is an envelope and increasing an image area.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has a conveying unit that conveys a recording medium, and an ejection port that ejects ink, and has a discharge port that ejects ink. Ink jet recording comprising: a recording unit that performs recording by discharging ink; and an engaging member that engages with a surface of the recording medium on the recording unit side at a downstream side of the recording unit in a transport direction of the recording medium by the transport unit. In the apparatus, when the recording medium is an envelope, the ejection of the ink from the ejection port to the envelope is started in a state where the downstream end in the conveyance direction of the envelope is engaged with the engagement member. And
[0012]
According to a second aspect of the present invention, there is provided the ink jet recording apparatus according to the first aspect, further comprising: a charging unit configured to charge the transporting unit so that the recording medium is electrostatically attracted to the transporting unit and transported. The recording is performed on a recording medium that is electrostatically attracted and conveyed.
[0013]
According to a third aspect of the present invention, in the ink jet recording apparatus according to the first or second aspect, the discharge port performs recording of the same image area by discharging ink a plurality of times, and the recording medium is an envelope. When the first transport distance of the envelope by the transport unit after the first ink is discharged from the discharge port to the envelope, the distance from the most downstream discharge port in the transport direction to the most upstream discharge port in the transport direction以下 or less.
[0014]
According to a fourth aspect of the present invention, in the ink jet recording apparatus according to the third aspect, when the recording medium is an envelope, the first ink ejection is performed on the upstream side in the transport direction from the most downstream ejection port. It is characterized in that it is performed using the above-mentioned discharge port.
[0015]
According to a fifth aspect of the present invention, in the ink jet recording apparatus of the first or second aspect, the number of the ejection ports is arranged in parallel in the transport direction at a distance of l, and the same image is formed by ejecting the ink n times. When recording is performed on an area and the recording medium is an envelope, the first ink ejection is performed from the m (<k / n) th ejection port counted from the most downstream ejection port in the transport direction. From the outlet, the first to m-1 + k / n discharge ports are used, and the first transport distance of the envelope by the transport unit after the first discharge of ink from the discharge port to the envelope is (m-1) ± 1 / n) · l.
[0016]
According to a sixth aspect of the present invention, in the ink jet recording apparatus according to the fifth aspect, m is 2, and an initial transport distance of the envelope is (1 + 1 / n) · l.
[0017]
According to a seventh aspect of the present invention, there is provided a transporting means for transporting a recording medium, and a discharge port for discharging ink, wherein recording is performed by discharging ink from the discharge port to a recording medium transported by the transporting means. An ink jet recording apparatus having a recording means for performing, and an engaging member which engages with a surface of the recording medium on the recording means side at a downstream side of the recording means in a conveying direction of the recording medium by the conveying means; When the envelope is an envelope, recording is performed by starting ejection of ink from the ejection port to the envelope in a state where the downstream end in the transport direction of the envelope is engaged with the engagement member. I do.
[0018]
According to an eighth aspect of the present invention, in the recording method according to the seventh aspect, a charging unit for charging the transport unit is used for electrostatically attracting and transporting the recording medium to the transport unit. The recording is performed on a recording medium that is sucked and conveyed.
[0019]
According to a ninth aspect of the present invention, in the recording method of the seventh or eighth aspect, the discharge port performs recording of the same image area by discharging ink a plurality of times, and the recording medium is an envelope. Is the initial transport distance of the envelope by the transport unit after the first ink is discharged from the discharge port to the envelope, the distance from the most downstream discharge port to the most downstream discharge port in the transport direction It is characterized by being not more than 1/2.
[0020]
According to a tenth aspect of the present invention, in the recording method according to the ninth aspect, when the recording medium is an envelope, the first ink ejection is performed on the upstream side in the transport direction from the most downstream ejection port. It is characterized in that it is performed using the discharge port.
[0021]
According to an eleventh aspect of the present invention, in the recording method according to the seventh or eighth aspect, the number of the ejection openings is k in a row in the transport direction at an interval of l, and the same image area is ejected n times. When the recording medium is an envelope, the first ejection of ink is performed from the m (<k / n) th ejection port counted from the most downstream ejection port in the transport direction. To the (m-1 + k / n) -th ejection port, and the first conveyance distance of the envelope by the conveyance means after the first ejection of the ink from the ejection port to the envelope is (m-1 ± 1 / n) · l.
[0022]
According to a twelfth aspect of the present invention, in the recording method of the eleventh aspect, m is 2, and an initial transport distance of the envelope is (1 + 1 / n) · l.
[0023]
【Example】
FIG. 1 schematically shows an ink jet printer as an ink jet recording apparatus which is an image forming apparatus to which the present invention is applied. The inkjet printer 100 can use any of ordinary paper commonly used for copying and the like, as well as OHP sheets, cards, thick papers such as postcards, and envelopes as image forming or recording media as sheet-shaped recording media. It is possible.
[0024]
The ink jet printer 100 includes a belt driving roller 10, a tension roller 11, and a charging and conveying belt 12 as an endless belt that is a conveying unit wound around these two rollers 10, 11. The charging / conveying belt 12 may be an endless belt in molding, or may be an endless belt by connecting both ends. The charging / conveying belt 12 has an insulating layer (not shown) formed on a surface layer to hold electric charges. The belt driving roller 10 is rotationally driven by a driving system constituted by driving means such as a motor (not shown).
[0025]
The ink jet printer 100 also includes a head 13 serving as an ink head as a recording unit that discharges ink onto a sheet as a recording medium (not shown) conveyed by the charging / conveying belt 12 and performs recording. And a carriage 9 for reciprocatingly moving in a direction perpendicular to the plane of FIG.
[0026]
The ink jet printer 100 is located between the belt driving roller 10 and the tension roller 11 and is disposed at a position facing the head 13 inside the charging and conveying belt 12, and guides the charging and conveying belt 12 from the inside. And a charging guide unit 14 for charging the charge transport belt 12, specifically, an insulating layer that forms a surface layer of the charge transport belt 12, for transporting the sheet by electrostatically attracting the sheet to the charge transport belt 12. And a charging roller 15.
[0027]
The ink jet printer 100 is also arranged on the upstream side of the head 13 in the moving direction A of the charging / conveying belt 12 so as to press against the belt driving roller 10 via the charging / conveying belt 12, so that the sheet adheres to the charging / conveying belt 12. The transport roller 16 to be moved and the downstream side of the head 13 in the moving direction A of the charging / conveying belt 12 are disposed so as to press against the tension roller 11 via the charging / conveying belt 12 to separate the sheet from the charging / conveying belt 12. And a separating claw 17.
[0028]
The inkjet printer 100 also includes a paper feed tray 18 loaded with paper, a paper feed roller 19 for feeding paper from the paper feed tray, and a separation pad for separating and feeding only one sheet fed from the paper feed roller 19. 20. The paper feed tray 18, the paper feed roller 19, and the separation pad 20 constitute a paper feed unit 21.
[0029]
The inkjet printer 100 also includes a guide member 21 for guiding the paper separated and sent by the separation pad 20, that is, the paper sent from the paper supply unit 21, substantially vertically upward, and a moving direction of the charging and conveying belt 12. A, which is located on the upstream side of the transport roller 16 and guided substantially vertically upward by the guide member 21, is turned by approximately 90 ° and is transported in a substantially horizontal direction. And a guide member 22 for transporting between the transport rollers 16.
[0030]
The guide member 22 transports the paper guided in the substantially vertical direction substantially in the direction of 90 degrees, and transfers the paper in a circular arc shape with the charge transport belt 12 wound around the belt drive roller 10. In order to form a path, the surface facing the charge transport belt 12 has an arc shape having a radius of curvature larger than the radius of curvature of the charge transport belt 12.
[0031]
The inkjet printer 100 also has a pair of rollers 23 located on the downstream side of the head 13 in the direction A for transporting the sheet separated from the charging / conveying belt 12 by the separating claw 17. Although the cross section of the roller pair 23 is shown in FIG. 1 as a simple circle, the spur roller 24 having a star-shaped cross section having a projection on the circumference, a roller 25 in opposition to the spur roller 24, and a roller pair 23 are fed. And a discharge tray 26 on which the stacked sheets are stacked.
[0032]
The spur roller 24 engages with the surface of the paper on the head side on the downstream side of the head 13 in the direction A. The spur roller 24 can be used not only for ordinary plain paper but also for thick paper such as an OHP sheet, a card, and a postcard. When recording is performed, the sheet is merely assisted in feeding the sheet. The sheet is engaged between the spur roller 24 and the roller 25, that is, the spur roller 24 is engaged with the sheet. It does not determine the gap between the surface and the head 13.
[0033]
As shown in FIG. 2, the ink jet printer 100 also detects whether the leading end of the sheet separated from the charging / conveying belt 12 by the separation claw 17 has bitten the roller pair 23, that is, has engaged with the spur roller 24. It has a sensor 27 as a means and a control means 28 for receiving a detection signal from the sensor 27. The sensor 27 optically detects the leading edge of the sheet.
[0034]
In the head 13, a large number of nozzles 29 each of which ejects ink in the moving direction A of the charging and conveying belt 12, that is, the sheet conveying direction A, in this embodiment, 192 nozzles 29 are incorporated. The nozzle 29 performs recording of the same image area by discharging ink a plurality of times as the carriage 9 reciprocates. For convenience of illustration, FIG. 2 illustrates a smaller number of nozzles 29 than actual.
[0035]
The control unit 28 controls which nozzle 29 ejects ink in accordance with the type and position of the sheet and the image to be recorded. The control means 28 controls the driving system of the belt driving roller 10 to control the rotation of the belt driving roller 10 and the rotation of the charging and conveying belt 12 due to the rotation. The control means 28 also drives the paper feed roller 19.
[0036]
The type of paper is input to the control unit 28 from outside the inkjet printer 100, is input to the control unit 28 by an input unit provided in the main body of the inkjet printer 100, or is provided in the main body of the inkjet printer 100 (not shown). After being determined by the paper type detection sensor, it is input to the control unit 28. The position of the sheet is determined by the control unit 28 based on the driving state of the sheet feeding roller 19 and the driving state of the driving system of the belt driving roller 10 and a signal from the sensor 27. Image information to be recorded is input to the control unit 28 from outside the inkjet printer 100.
[0037]
The guide member 14 has a size that covers a scanning range of the carriage 9, in other words, a range in which ink is printed by the nozzle 29 mounted on the head 13, and is provided at a position facing the scanning range and the printing range. Have been. The guide member 14 has a guide surface, which will be described later, that guides the charge transport belt 12 from the inside in the scanning range and the printing range.
[0038]
The guide member 14 is formed by resin molding. On the surface of the guide member 14 on the side that comes into contact with the charging and conveying belt 12, a plurality of ribs (not shown in detail) arranged in the direction A, which are not shown in detail, are provided on the guide member 14 main body. The rib is provided so as to have a shape that is long in a direction perpendicular to the direction A, that is, a direction perpendicular to the paper surface in FIGS. The top surface of the plurality of ribs forms the above-described guide surface that contacts the charging and conveying belt 12 and guides the charging and conveying belt 12. The guide surface is parallel to a scanning surface on which the head 13 performs scanning. The width of the rib in the direction A is 5 mm.
[0039]
Since the rib has high accuracy even when resin molding is performed, the flatness of the guide surface is good. Therefore, the gap between the charging and conveying belt 12 and the head 13 is stabilized with high accuracy, and the recording accuracy, that is, the image quality is improved. In addition, since the ribs are provided to contact the charging / conveying belt 12 only at the top, the load on the drive system of the charging / conveying belt 12 is reduced as compared with the case where the entire guide member 14 is planar and contacts the charging / conveying belt 12 as a whole. Has been reduced.
[0040]
Similarly, by contacting the charging and conveying belt 12 only at the top of the rib, the loss of charge of the charging and conveying belt 12 due to contact with the guide member 14 is reduced, and the suction force of the sheet by the charging and conveying belt 12 is maintained. The sheet is conveyed while maintaining a state along the charging and conveying belt 12, that is, a flat state, even if the sheet absorbs moisture in the ink and would normally cause cockling.
[0041]
The actual transport surface 28 of the charge transport belt 12 formed by the guide surface 14b has two rollers, a belt drive roller 10 and a tension roller 11, on both sides of the guide member 14, that is, on the upstream and downstream sides in the direction A. Is located closer to the head 13 than a virtual conveyance surface indicated by a two-dot chain line of the charge conveyance belt 12.
[0042]
Assuming that the guide surface and the actual transport surface are on the virtual transport surface or at a position farther from the head 13 than the virtual transport surface, the charging transport belt 12 moves between the belt driving roller 10 and the tension roller 11 only. The belt may be stretched and vibrate in a state like a string, and the gap between the charging and conveying belt 12 and the head 13 may not be stable. As a result, the image quality may be deteriorated. By setting the above-mentioned position, the charge transport belt 12 is pushed up from the inside, such vibration is prevented, the gap between the charge transport belt 12 and the head 13 is stabilized with high accuracy, and a high-quality image is formed.
[0043]
Even when the charge transport belt 12 is pushed up, the guide surface is formed by the ribs, so that the load on the drive system is suppressed and the flatness is improved. Since the recording is performed in the process in which the sheet is electrostatically attracted to and conveyed to the charging and conveying belt 12, the flatness of the sheet itself is good, and the recording is performed with the charging and conveying belt 12 guided by the guide surface. Since it is performed at the position, the gap between the sheet and the head 13 is accurately and uniformly maintained, and the image accuracy is improved.
[0044]
By the way, when the recording medium, that is, the paper is an envelope, as described above, the portion on which the recording of the envelope is performed, that is, the portion facing the head 13 is not electrostatically attracted to the charging / conveying belt 12 and is charged. The envelope may float from a portion opposed to the transport belt 12 and electrostatically attracted to the charge transport belt 12, and the envelope may be electrostatically attracted to the charge transport belt 12 as compared to a normal sheet due to its shape. And may be in a state of floating from the charging and conveying belt 12.
[0045]
When the recording is performed in such a state, the accuracy of the gap between the head 13 and the envelope surface is reduced, so that the recording accuracy, that is, the printing accuracy is reduced. 29 and the envelope itself may be stained. Therefore, in the ink jet printer 100, when the control unit 28 determines that the sheet is an envelope, the sensor 27 causes the downstream end of the envelope in the direction A to engage the spur roller 24. Then, the discharge of the ink from the nozzle 29 to the envelope is started.
[0046]
The spur roller 24 comes into contact with the spur roller 24 when recording on the envelope with a pressure enough to maintain a gap between the surface of the envelope and the nozzle 29, and does not press the envelope, but comes into contact with the spur roller 24. As a result, the image formed on the envelope is not disturbed by scratches or the like. This is because, unlike the spur disclosed in the above-mentioned [Patent Document 1], the spur roller 24 is provided as an auxiliary for conveying the recording medium.
[0047]
Here, the ink jet printer 100 according to the present invention starts recording after engaging with the spur roller 24 provided on the downstream side of the head 13 in the direction A when recording on the envelope as described above. If recording is performed in the same manner as in the related art, recording at the leading end of the envelope in the direction A cannot be performed, and the image printing area cannot be increased.
[0048]
That is, in the conventional ink jet recording apparatus and the recording method using the same, for example, the number of nozzles is 192 which is the same as that in the present embodiment, and when the same image area is formed by two scans of the carriage, the nozzle located at the most downstream in the A direction , The first nozzle is the first nozzle, and the most upstream nozzle is the 192nd nozzle. In the first scan, printing is performed using the 97th nozzle to the 192nd nozzle, that is, the half of the nozzle on the upstream side in the A direction, and the second scan is performed. Since the scan is performed using all the nozzles after a line feed of a distance of 96.5 nozzles, the recording area by the first half of the nozzles on the downstream side in the A direction is lost and the non-image-forming area is increased. Become.
[0049]
Therefore, in the inkjet printer 100, when the recording medium is an envelope, the control unit 28 sets the initial transport distance of the envelope by the charge transport belt 12 after the first ink is ejected from the nozzle 29 to the envelope. The ink is ejected by an appropriate nozzle 29 out of the 192 nozzles 29 so that the distance from the most downstream nozzle 29 to the most upstream nozzle 29 in FIG. Is to be performed.
[0050]
Specifically, assuming that the most downstream nozzle 29 is the first nozzle and the most upstream nozzle 29 is the 192 nozzle in the A direction, if the same image area is formed by two scans of the carriage, the first scan In this case, printing is performed using the nozzle 29 shifted from the second nozzle to the 97th nozzle, that is, the nozzle 29 shifted one half upstream from the half in the direction A, and the second scan is performed from the first nozzle to the 192nd nozzle. After a line feed of 1.5 nozzles, which is less than half of the distance (i.e., 1.5 times the distance between the nozzles 29 (a distance 1 to be described later)), printing is performed using all the nozzles 29. Thus, printing is performed by using the nozzle 29 on the downstream side in the direction A in comparison with the conventional case described above, and the image printing area is increased by reducing the loss of the printing area and reducing the area where image formation is not possible.
[0051]
The reason that the first nozzle is not used and the second and subsequent nozzles are used is that when the first nozzle is used, the line feed thereafter must be 0.5 nozzle. This is because it is difficult to drive the belt drive roller 10 and the charge transport belt 12 at a very short distance using a general drive system. Therefore, when the recording medium is an envelope, as in the present embodiment, the first ink ejection is performed by the nozzle 29 on the upstream side in the direction A from the most downstream nozzle, that is, the first nozzle, ie, the nozzles after the second nozzle. 29. It is possible to appropriately select the first and second nozzles after the second nozzle to perform the first recording. However, it is desirable to minimize the loss of the recording area within a range where the line feed can be surely performed. In the embodiment, the second nozzle is used.
[0052]
Therefore, when k nozzles 29 are arranged in the direction A at an interval of 1 in the direction A, and the same image area is recorded on the envelope by discharging the ink n times, the first ink discharge is performed. The charging / conveying belt 12 is operated from the m-th (<k / n) -th nozzle 29 counting from the most downstream nozzle 29 in the direction A using the m−1 + k / n-th nozzles 29 after the first ink ejection. If the initial transport distance of the envelope is (m-1 ± 1 / n) · l, the image printing area can be increased by reducing the loss of the recording area and reducing the non-image forming area. .
[0053]
If m is set to 2 and the first transport distance of the envelope is set to (1 + 1 / n) · l, the loss of the recording area can be minimized within a range where the line feed can be surely performed. In this embodiment, since n is 2, the initial transport distance of the envelope is 1.5 nozzles.
[0054]
The ink jet recording apparatus and the recording method to which the present invention has been applied have been described above. However, if the engaging member engages with the recording surface of the envelope at the position closest to the recording means on the downstream side of the recording means in the direction A, The shape is not limited to the roller shape. The detecting means may detect the leading edge of the sheet by contact, instead of optically detecting the leading edge of the sheet. The detecting unit may drive the sheet feeding roller 19, drive the belt driving roller 10, and drive the charging / conveying belt 12. The calculation may be performed by the control unit 28 based on the driving state of the system and the distance over which the paper must be conveyed from the paper feed tray 18 to the roller pair 23.
[0055]
【The invention's effect】
The present invention is directed to a conveying unit that conveys a recording medium, and a recording unit that has an ejection port for ejecting ink and that performs recording by ejecting ink from the ejection port to a recording medium conveyed by the conveyance unit. An ink jet recording apparatus having an engaging member that engages with the surface of the recording medium on the recording unit side on the downstream side of the recording unit in the conveying direction of the recording medium by the conveying unit, wherein the recording medium is an envelope. Since the discharge of the ink from the discharge port to the envelope is started in a state where the downstream end in the transport direction of the envelope is engaged with the engagement member, even when the recording medium is an envelope, Prevents lifting and maintains the gap between the recording medium and the head to prevent printing accuracy from deteriorating, and also causes the recording medium surface to come into contact with the ejection port to contaminate the ejection port. By preventing the body itself becomes dirty, it is possible to provide an ink jet recording apparatus capable of performing good recording.
[0056]
If the recording medium has a charging means for electrostatically adsorbing the recording medium to the conveying means to convey the recording medium, and if the recording medium is electrostatically adsorbed to the conveying means and conveyed, the recording is performed. It is possible to provide an ink jet recording apparatus capable of preventing the floating of the medium more favorably, securing the conveyance force of the recording medium, and performing good recording.
[0057]
The ejection port performs recording of the same image area by ejecting the ink a plurality of times, and when the recording medium is an envelope, the conveyance unit after the first ink ejection from the ejection port to the envelope is performed. If the first transport distance of the envelope is set to be equal to or less than 1/2 of the distance from the most downstream discharge port to the most upstream discharge port in the transport direction, the non-image forming area is reduced to reduce the transport area. It is possible to provide an ink jet recording apparatus capable of enlarging the image area of the recording medium at the front end on the downstream side in the direction.
[0058]
When the recording medium is an envelope, if the first ejection of ink is performed using an ejection port on the upstream side in the transport direction from the most downstream ejection port, the first line feed of the recording medium is reliably performed. Thus, it is possible to provide an ink jet recording apparatus capable of performing good recording.
[0059]
The k ejection ports are arranged in parallel in the transport direction at an interval of l, and the same image area is recorded by ejecting the ink n times. When the recording medium is an envelope, the first ink ejection is performed. From the m (<k / n) th discharge port counting from the most downstream discharge port in the transport direction to the (m−1 + k / n) th discharge port. If the initial transport distance of the envelope by the transport unit after the first ink ejection from the printer to the envelope is set to (m-1 ± 1 / n) · l, the area where image formation is impossible is reduced. Thus, it is possible to provide an ink jet recording apparatus capable of enlarging the image area of the recording medium at the downstream end in the transport direction.
[0060]
If m is 2, and the first transport distance of the envelope is (1 + 1 / n) · l, the first line feed of the recording medium can be performed satisfactorily, and good recording can be performed. An inkjet recording device can be provided.
[0061]
The present invention is directed to a conveying unit that conveys a recording medium, and a recording unit that has an ejection port for ejecting ink and that performs recording by ejecting ink from the ejection port to a recording medium conveyed by the conveyance unit. Using an ink jet recording apparatus having an engaging member that engages with the surface of the recording medium on the recording unit side on the downstream side of the recording unit in the conveying direction of the recording medium by the conveying unit, and the recording medium is an envelope. Since recording is performed by starting ejection of ink from the ejection port to the envelope in a state in which the downstream end of the envelope in the transport direction is engaged with the engagement member, the recording medium is an envelope. In this case, the gap between the recording medium and the head is maintained by preventing the floating of the recording medium, preventing the printing accuracy from deteriorating. By prevented that also dirty and that the recording medium itself dirty, it is possible to provide a recording method capable of performing good recording.
[0062]
If the recording medium is electrostatically attracted to the transporting means and transported by using a charging means for charging the transporting means, and the recording medium is electrostatically attracted to the transporting means and transported, the recording medium may be used. In addition, it is possible to provide a recording method capable of preventing the floating of the recording medium more favorably, securing the conveying force of the recording medium, and performing the excellent recording.
[0063]
The ejection port performs recording of the same image area by ejecting ink a plurality of times, and when the recording medium is an envelope, the transport unit after the first ejection of ink from the ejection port to the envelope. If the initial transport distance of the envelope is set to 以下 or less of the distance from the most downstream discharge port to the most upstream discharge port in the transport direction, the area where image formation is impossible can be reduced. It is possible to provide an ink jet recording apparatus capable of enlarging the image area of the recording medium at the front end on the downstream side in the transport direction.
[0064]
When the recording medium is an envelope, if the first ejection of ink is performed using an ejection port on the upstream side in the transport direction from the most downstream ejection port, the first line feed of the recording medium is reliably performed. And a recording method capable of performing good recording can be provided.
[0065]
The k ejection ports are arranged in parallel in the transport direction at an interval of l, and the same image area is recorded by ejecting the ink n times. When the recording medium is an envelope, the first ink ejection is performed. From the m (<k / n) th discharge port counting from the most downstream discharge port in the transport direction to the (m−1 + k / n) th discharge port. If the initial transport distance of the envelope by the transport unit after the first ink ejection from the printer to the envelope is set to (m-1 ± 1 / n) · l, the area where image formation is impossible is reduced. Accordingly, it is possible to provide a recording method capable of enlarging the image area of the recording medium at the downstream end in the transport direction.
[0066]
If m is 2, and the first transport distance of the envelope is (1 + 1 / n) · l, the first line feed of the recording medium can be performed satisfactorily, and good recording can be performed. A recording method can be provided.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an inkjet recording apparatus to which the present invention is applied.
FIG. 2 is a side view showing a main part of the ink jet recording apparatus shown in FIG.
[Explanation of symbols]
12 Transport means
13 Recording means
15 Charging means
24 Engaging member
29 outlet
A Recording medium transport direction

Claims (12)

Conveying means for conveying the recording medium,
A recording unit that has an ejection port for ejecting ink and performs recording by ejecting ink from the ejection port to a recording medium conveyed by the conveyance unit;
An ink jet recording apparatus comprising: an engagement member that engages with a surface of the recording medium on the recording unit side on a downstream side of the recording unit in a conveyance direction of the recording medium by the conveyance unit.
When the recording medium is an envelope, ink discharge from the discharge port to the envelope is started in a state where the downstream end of the envelope in the transport direction is engaged with the engaging member. Recording device. 2. The ink jet recording apparatus according to claim 1, further comprising a charging unit configured to charge the transport unit so that the recording medium is electrostatically attracted to the transport unit and transported, and the recording medium is electrostatically attracted to the transport unit and transported. An ink jet recording apparatus for performing recording on a medium. The inkjet recording apparatus according to claim 1, wherein
The discharge port is for performing recording of the same image region by discharging the ink a plurality of times,
When the recording medium is an envelope, the first transport distance of the envelope by the transport unit after the first ink is discharged from the discharge port to the envelope, the most upstream from the most downstream discharge port in the transport direction. An ink jet recording apparatus characterized in that the distance to the discharge port is 1/2 or less. 4. The ink jet recording apparatus according to claim 3, wherein, when the recording medium is an envelope, the first ejection of the ink is performed using the ejection port upstream of the most downstream ejection port in the transport direction. An ink jet recording apparatus characterized by the above-mentioned. The inkjet recording apparatus according to claim 1, wherein
The discharge ports are arranged in a row at a distance of l in the transport direction, and the number of the discharge ports is n, and the recording of the same image area is performed by discharging the ink n times.
When the recording medium is an envelope, the first ink ejection is performed from the m (<k / n) th ejection port counting from the most downstream ejection port in the transport direction to the (m-1 + k / n) th ejection port. And the first transport distance of the envelope by the transport means after the first ink is discharged from the discharge port to the envelope is (m-1 ± 1 / n) · l. An inkjet recording apparatus characterized by the above-mentioned. 6. The ink jet recording apparatus according to claim 5, wherein m is 2, and an initial transport distance of the envelope is (1 + 1 / n) · l. Conveying means for conveying the recording medium,
A recording unit that has an ejection port for ejecting ink and performs recording by ejecting ink from the ejection port to a recording medium conveyed by the conveyance unit;
Using an inkjet recording apparatus having an engaging member that engages with a surface of the recording medium on the recording unit side on the downstream side of the recording unit in the conveying direction of the recording medium by the conveying unit,
When the recording medium is an envelope, the recording is performed by starting ejection of ink from the ejection port to the envelope in a state where the downstream end of the envelope in the transport direction is engaged with the engagement member. Recording method characterized by the above-mentioned. 8. The recording method according to claim 7, further comprising: using a charging unit that charges the conveyance unit so that the recording medium is electrostatically attracted to the conveyance unit and conveys the recording medium. A recording method characterized by performing recording. The recording method according to claim 7 or 8,
The discharge port is for performing recording of the same image region by discharging the ink a plurality of times,
When the recording medium is an envelope, the first transport distance of the envelope by the transport unit after the first ink is discharged from the discharge port to the envelope, the most upstream from the most downstream discharge port in the transport direction. A recording method, wherein the distance is set to 1/2 or less of the distance to the discharge port. 10. The recording method according to claim 9, wherein, when the recording medium is an envelope, the first ejection of the ink is performed using the ejection port upstream of the most downstream ejection port in the transport direction. Characteristic recording method. The recording method according to claim 7 or 8,
The discharge ports are arranged in a row at a distance of l in the transport direction, and the number of the discharge ports is n, and the recording of the same image area is performed by discharging the ink n times.
When the recording medium is an envelope, the first ink ejection is performed from the m (<k / n) th ejection port counting from the most downstream ejection port in the transport direction to the (m-1 + k / n) th ejection port. And the first transport distance of the envelope by the transport means after the first ink is discharged from the discharge port to the envelope is (m-1 ± 1 / n) · l. Recording method characterized by the above-mentioned. 12. The recording method according to claim 11, wherein m is 2, and an initial transport distance of the envelope is (1 + 1 / n) · l.

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