JP4608738B2 - Inkjet recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus, and more particularly, to an ink jet recording apparatus having recording medium holding means for holding the recording medium to prevent the recording medium from rising when an image is recorded on the recording medium by a recording head.
[0002]
[Prior art]
An ink jet recording apparatus that records an image by ejecting ink onto a roll-like or sheet-like recording medium generally scans a recording head that ejects ink onto the recording medium across the width direction of the recording medium, The operation of recording an image by ejecting ink during the scanning process and the operation of conveying the recording medium by a predetermined amount along a direction substantially orthogonal to the scanning direction are sequentially repeated to obtain a desired image on the recording medium. An image is recorded and formed.
[0003]
In order to record and form a high-quality image, it is important to maintain the smoothness of the surface of the recording medium on which ink is ejected during image recording. For this reason, the ink jet recording apparatus is provided with a recording medium holding means for contacting and holding the back surface of the recording medium.
[0004]
As shown in FIG. 19A, the recording medium holding unit sucks air into a flat plate-like holding unit 100 that is in contact with the back surface of the recording medium by a suction unit such as a suction fan or a suction pump. A large number of suction holes 101 are opened, and by sucking air from the suction holes 101, the recording medium is sucked and adsorbed on the surface, and the smoothness of the surface of the recording medium is maintained.
[0005]
Also, when recording and forming an image larger than the size of the recording medium (a borderless image), when recording is performed in a range larger than the size of the recording medium by the recording head, the recording is jetted from the recording head. In order to accept excess ink that protrudes from both side edges of the medium, ink receiving openings 102 and 103 are provided at positions corresponding to both side edges of the recording medium, respectively, as shown in FIG.
[0006]
[Problems to be solved by the invention]
In an ink jet recording apparatus, in order to stably eject ink onto a recording medium, the interval between the recording head and the recording medium is very close.
[0007]
For this reason, if there is a lift or the like in the recording medium held by the holding means, there is a problem that the recording medium and the recording head nozzle are damaged due to contact between the recording medium and the recording head. Since it is difficult to record and form a high-quality image, it is necessary to suppress the occurrence of the lifting as much as possible.
[0008]
In particular, since the recording head performs main scanning along the width direction of the recording medium, it is important to suppress lifting at both side edges of the recording medium.
[0009]
As shown in FIG. 19B, when the holding portion 100 has ink receiving openings 102 and 103, the openings 102 and 103 are located at both side edges of the recording medium. For this reason, the recording medium is not sucked or sucked in the portion, and there is a concern about the problem of contact with the recording head due to the floating of the recording medium.
[0010]
Further, since the ink receiving openings 102 and 103 formed in the holding unit 100 are provided corresponding to the width of the recording medium, a borderless image is recorded when a recording medium having a different width is used. I can't.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording apparatus that can prevent the occurrence of lifting at both side edges of a recording medium and perform high-quality image recording.
[0012]
Another object of the present invention is to provide an ink jet recording apparatus that can easily cope with the case of recording an image on various recording media having different widths.
[0022]
Claim 1 The invention described above includes a recording medium supplying means for supplying a recording medium, a conveying means for conveying the recording medium, a recording means for scanning the width of the recording medium and ejecting ink to record an image, and an image In the ink jet recording apparatus having the recording medium holding means for holding the recording medium and preventing the floating during the recording of the recording medium, the recording medium holding means records the recording in a larger range than the recording medium in the holding portion in contact with the back surface of the recording medium. An ink jet recording apparatus comprising: an ink receiving opening for receiving surplus ink ejected when performing the operation; and the position of the opening can be changed according to the width of the recording medium. It is.
[0023]
Claim 2 In the described invention, the holding unit is configured to be replaceable, and the holding unit is replaced with one of a plurality of types of holding units each formed with an ink receiving opening corresponding to the width of the recording medium. Thus, the position of the ink receiving opening can be changed. 1 Inkjet recording apparatus.
[0024]
Claim 3 In the described invention, an opening having a size suitable for the opening is formed on the lower surface of the holding portion formed with an opening for receiving ink at a position corresponding to the width of each recording medium. A small number of slide plates formed are slidably brought into contact with each other, and the relative position between the holding portion and the slide plate is changed to selectively adapt one of the opening portions of the holding portion to the opening of the slide plate. Thus, the position of the ink receiving opening can be changed. 1 Inkjet recording apparatus.
[0035]
Claim 4 The described invention includes a recording medium supplying unit that supplies a recording medium, a conveying unit that conveys the recording medium, a recording unit that scans across the width of the recording medium and ejects ink to record an image, and an image In the ink jet recording apparatus having the recording medium holding means for holding the recording medium and preventing the floating during the recording, the recording medium holding means includes a holding part having a plurality of suction holes in contact with the back surface of the recording medium, and the holding part A negative pressure chamber provided on the lower surface side, suction means connected to the negative pressure chamber and sucking air from the suction holes to adsorb the recording medium to the holding portion, and provided in the negative pressure chamber, An ink receiving portion for receiving surplus ink ejected when recording in a range larger than the medium, and the ink receiving portion opens a discharge port for discharging the surplus ink stored inside. The excess ink in the ink receiving portion is discharged by the suction force of the suction means by facing the negative pressure chamber through the valve and opening the on-off valve when the recording means is not recording. Inkjet recording apparatus.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0037]
FIG. 1 is a configuration diagram showing an outline of an ink jet recording apparatus.
[0038]
As shown in the figure, a recording medium supply means 1 is disposed above the apparatus. The recording medium supply means 1 includes a plurality of (two in the illustrated example) paper rolls 1A and 1B around which a long recording medium is wound. It has come out.
[0039]
The transport unit 2 includes transport roller pairs 21A and 21B that transport the respective recording media 10A and 10B, and transport motors 22A and 22B that drive the transport roller pairs 21A and 21B, and paper rolls 1A and 1B. Each of the recording media 10A and 10B fed out from the above is sandwiched between the pair of transport rollers 21A and 21B, and transported to the recording means 3 at the next stage by driving control of the transport motors 22A and 22B.
[0040]
The recording means 3 records and forms an image on the surface side (recording surface side) of each of the recording media 10A and 10B by ejecting droplets of ink from a plurality of nozzles onto the recording media 10A and 10B. The recording head 31 is mounted on a carriage 33 that is movably mounted along a scanning guide 32 that is horizontally mounted so as to be substantially orthogonal to the conveyance direction (sub-scanning direction) of the recording media 10A and 10B.
[0041]
The recording head 31 includes, for example, a plurality of ink tanks in which inks such as Y (yellow), M (magenta), C (cyan), and K (black) are stored, and ink in each ink tank as droplets. A plurality of nozzle heads for injecting the ink into the recording medium 10 are arranged. When the carriage 33 is moved by a pulley 35 interlocked with the carriage motor 34, a direction (mainly perpendicular to the conveying direction of the recording media 10A and 10B) Along the scanning direction) and over the respective recording media 10A and 10B.
[0042]
The recording media 10A and 10B on which the image is recorded by the recording means 3 are nipped and transferred by the roller pairs 4A and 4B, respectively, and then cut by the cutter 5 into a predetermined size such as for each image.
[0043]
On the back side of the recording mediums 10A and 10B on which image recording is performed by the recording head 31, the recording medium holding means 6 extends in the main scanning direction and across the recording media 10A and 10B so as to face the recording head 31. Is arranged.
[0044]
The recording medium holding means 6 holds the recording media 10A and 10B when the image is recorded on the recording media 10A and 10B by the recording head 31 to maintain the smoothness of the surface, and at the same time, prevents the lifting of the recording media 10A and 10B. It functions to avoid contact with the recording head 31 that moves along the scanning direction.
[0045]
FIG. 2 shows an example of an embodiment of the recording medium holding means 6. (A) is a partial plan view of the recording medium holding means 6, and (b) is a side sectional view taken along line (I)-(I) of (a).
[0046]
The ink jet recording apparatus shown in the present embodiment is configured to be able to simultaneously transport two rows of recording media 10A and 10B, and the recording medium holding means 6 has a bilaterally symmetric structure corresponding to each of the recording media 10A and 10B. Therefore, hereinafter, unless otherwise specified, only the portion corresponding to the recording medium 10A side will be described in this specification.
[0047]
The recording medium holding means 6 has a box-like negative pressure arranged on the lower surface side of the holding portion 61 with a large number of suction holes 611 formed in the surface of the flat holding portion 61 in contact with the back surface of the recording medium 10A. By driving an appropriate suction means such as a suction fan or a suction pump (not shown) connected to the chamber 62, the inside of the negative pressure chamber 62 is set to a negative pressure and air is sucked from the numerous suction holes 611, whereby the holding plate 61 The recording medium 10A is adsorbed on the surface to prevent its floating.
[0048]
The holding plate 61 is provided with ink receiving openings 612 and 613 at positions corresponding to both side edges of the recording medium 10A. The lengths of the openings 612 and 613 are formed to be the same as or slightly longer than the length along the sub-scanning direction of the recording head 31. In order to record and form a so-called borderless image, the recording head 31 uses the recording medium 10A. When recording is performed in a range larger than the size, surplus ink ejected from the recording head 31 and protruding from both side edges of the recording medium 10A is received. Excess ink received from the openings 612 and 613 is temporarily stored in an ink receiving portion 63 disposed in the negative pressure chamber 62 in communication with the openings 612 and 613, and then discharged to a waste ink tank (not shown). The
[0049]
In these openings 612 and 613, the suction and suction of the recording medium 10A is not performed. Therefore, suction portions 64 for sucking both side edges of the recording medium 10A are provided in the vicinity of the openings 612 and 613. Yes.
[0050]
The suction section 64 shown in FIG. 2 includes air suction holes 641, and is positioned along the transport direction of the recording medium 10A in the openings 612 and 613 and on the transport path of the recording medium 10A, and upstream of the openings 612 and 613. Provided on the side and the downstream side. The shape is not limited to the illustrated round hole shape, but may be any shape such as a square hole shape or a slit shape. Moreover, you may form with a porous material.
[0051]
By driving the suction means, air is sucked from the suction holes 611 of the holding portion 61 and at the same time, air is sucked from the air suction holes 641 of the suction portion 64. As a result, both side edges of the recording medium 10A where the ink receiving openings 612 and 613 exist are also sucked and adsorbed on the surface of the holding unit 61, and the lifting is prevented. Therefore, the problem of printing failure due to contact with the recording head due to the floating of the side edge of the recording medium is solved.
[0052]
Although this adsorption | suction part 64 is provided in the upstream / downstream side along the conveyance direction of opening part 612,613, only any one of the upstream / downstream side may be sufficient.
[0053]
FIG. 3 shows another example of the suction unit 64.
[0054]
FIG. 3A shows an example in which the suction portion 64 is provided on the side portions of the openings 612 and 613. The suction portion 64 is provided with a large number of air suction holes 642 in a row along the longitudinal direction of the openings 612 and 613. The suction portion 64 is located on the side along the longitudinal direction of the openings 612 and 613 and on the conveyance path of the recording medium 10A, that is, inside the openings 612 and 613, respectively.
[0055]
FIG. 3B shows an example in which the suction portion 64 is formed by a slit 643 for air suction. The slits 643 are also formed on the side portions along the longitudinal direction of the openings 612 and 613 and on the conveyance path of the recording medium 10A. Similarly, the both side edges of the recording medium 10A are driven by the suction unit. Sucking and adsorbing on the surface prevents it from floating. The slits 643 may be arranged on the upstream side and / or the downstream side in the opening portions 612 and 613 along the conveyance direction of the recording medium 10A.
[0056]
In FIG. 3C, the adsorbing portion 64 is arranged along the conveyance direction of the recording medium 10A in the openings 612 and 613 and on the upstream and downstream sides on the conveyance path of the recording medium 10A and in the longitudinal direction of the openings 612 and 613. In this example, the air suction holes 641 and the air suction slits 643 are combined.
[0057]
FIG. 4 shows still another example of the suction part 64.
[0058]
The attracting portion 64 is configured by an electrostatic attracting portion 644 that is formed flush with the surface of the holding portion 61. Unlike the suction portions such as the air suction holes 641 and 642 and the slit 643 that suck air, the electrostatic suction portion 644 has a function of sucking the recording medium by using the electrostatic phenomenon. Yes.
[0059]
The electrostatic attraction part 644 shown in the figure is arranged around each of the four sides of the ink receiving openings 612 and 613. The recording medium 10A is sucked and adsorbed on the surface of the holding portion 61 by suction of air from a number of suction holes 611 by a suction means, and both side edges located on the ink receiving openings 612 and 613 are The electrostatic adsorption part 644 is electrostatically adsorbed on the surface of the holding part 61, and the floating is prevented.
[0060]
The electrostatic attraction unit 644 is not limited to a mode that surrounds the four sides of the openings 612 and 613, and can take various modes as shown in FIG.
[0061]
FIG. 5A is provided so as to surround the three sides of the opening 612 except for one side of the outside of the opening 612 (on the side opposite to the other openings 613).
[0062]
FIG. 5B is provided with a constant width so as to be along only one side inside the opening 612 (on the other opening 613 side).
[0063]
FIG. 5C is provided along the conveyance direction of the recording medium 10A in the opening 612 and on the upstream and downstream sides on the conveyance path of the recording medium 10A.
[0064]
Such an electrostatic adsorption unit 644 can adsorb the recording medium 10 </ b> A in a planar shape with a constant width, compared to an apparatus that adsorbs the recording medium 10 </ b> A by sucking air from the air suction holes 641 and 642.
[0065]
In addition, it is preferable that the electrostatic attraction unit 644 is partially provided at a portion necessary for preventing the lift, such as a position corresponding to both side edges of the recording medium. In this way, it can be configured at a lower cost compared to the case where the electrostatic chucking portion 644 is provided on the entire surface of the holding portion 61.
[0066]
FIG. 6 shows an example in which the electrostatic adsorption portion 644 is partially provided over the surface of the holding portion 61 in addition to the vicinity of the ink receiving openings 612 and 613. Four electrostatic attraction portions 644 shown in this figure are provided between the openings 612 and 613 with a constant width along the conveyance direction of the recording medium 10A, but the number is not limited.
[0067]
Further, if the partial adsorption of the recording medium 10A by the electrostatic adsorption unit 644 and the adsorption of the recording medium 10A by the suction of air from the suction hole 611 are used in combination, the entire recording medium 10A is sucked by the air suction to the surface of the holding unit 61. At the same time, the recording medium 10A is partially placed by the electrostatic chucking portion 644 in a part where the floating of the recording medium 10A is likely to occur, for example, in the vicinity of the ink receiving openings 612 and 613 as described above. Thus, the surface of the holding unit 61 can be reliably adsorbed, and the problem caused by the floating of the recording medium 10A can be solved more effectively.
[0068]
FIG. 7 shows another example of preventing the rising of both side edges of the recording medium. The connection ports 621 and 622 of the negative pressure chamber 62 of the recording medium holding means 6 are connected to the suction ports 65 at both side edges of the recording medium 10A. The example provided corresponding to the position of the part vicinity is shown, respectively.
[0069]
As shown in FIG. 8, each of the connection ports 621 and 622 is approximately along the position of both side edges of the recording medium 10 </ b> A and the conveying direction on the side surface of the negative pressure chamber 62 as viewed from the front surface side of the holding unit 61. It is provided at a position where it overlaps, and is connected to the suction means 65 by suction ducts 651 and 652, respectively.
[0070]
When the air in the negative pressure chamber 62 is sucked through the suction ducts 651 and 652 by driving the suction means 65, the suction force in the vicinity of the connection ports 621 and 622 is improved, and thereby both side edges of the recording medium 10A. Improve nearby suction. Accordingly, it is possible to effectively prevent lifting of both side edges of the recording medium 10A with a simple configuration.
[0071]
The connection ports 621 and 622 may be provided on the bottom surface of the negative pressure chamber 62 as long as the connection ports 621 and 622 are provided corresponding to positions in the vicinity of both side edges of the recording medium 10A. Further, the negative pressure chamber 62 may be provided on the upstream side surface in the conveyance direction of the recording medium 10A.
[0072]
Next, an aspect in which the position of the ink receiving opening formed in the holding portion of the recording medium holding means can be changed will be described.
[0073]
FIG. 9 shows a case in which the holding unit can be replaced. Here, the entire recording medium holding unit 6 that holds each row of the recording media 10A and 10B is shown.
[0074]
The holding part is divided into two parts 61A and 61B corresponding to the recording media 10A and 10B, respectively, and is attached to the upper surface of the negative pressure chamber 62 so as to be detachable by appropriate fixing means. The fixing means is not limited at all.
[0075]
Each holding portion 61A, 61B is provided with ink receiving openings 612A, 613A, 612B, 613B at positions corresponding to both side edges of the recording media 10A, 10B.
[0076]
These openings 612A, 613A, 612B, and 613B are provided only to correspond to the width of one type of recording medium. In order to enable recording of a borderless image on a recording medium having a width different from that of the recording medium corresponding to the openings, as shown in FIG. A plurality of types of holding portions 61A1, 61A2, 61A3, and 61A4 each having ink receiving openings 612A and 613A are prepared. FIG. 10 shows a holding part for replacement of the holding part 61A.
[0077]
For example, the holding portion 61A1 has a recording medium width of 127 mm, the holding portion 61A2 has a size of 100 mm, the holding portion 61A3 has a size of 89 mm, the holding portion 61A4 has a size of 82 mm, and the like. Each is provided according to the width. However, in this case, since the recording medium always has the side edge corresponding to the opening 613A at a fixed position, only the position of the opening 612A is changed.
[0078]
Depending on the width of the recording medium on which recording is performed, the positions of the openings 612A and 613A can be changed to match the widths of various recording media by replacing any one of these holding portions 61A1, 61A2, 61A3, and 61A4. It is possible to record borderless images corresponding to a plurality of types of recording media having different widths with a single recording apparatus.
[0079]
Further, if the suction holes 611 are formed only between the openings 612A and 613A in each of the holding portions 61A1, 61A2, 61A3, and 61A4, even if the width of the recording medium changes, the necessary portions according to the change, That is, it is possible to suck only the area where the recording medium exists, eliminate the waste of air leakage caused by sucking from a place unnecessary for suction where the recording medium does not exist, and prevent the suction force from decreasing.
[0080]
It should be noted that, in the negative pressure chamber 62, each holding unit can receive excess ink through the opening 612A whose position is changed when the holding unit is replaced with any of 61A1, 61A2, 61A3, and 61A4. It is preferable that a plurality of ink receiving portions are arranged in advance so as to correspond to the positions of the opening portions 612A.
[0081]
FIG. 11 shows another mode in which the position of the ink receiving opening formed in the holding portion of the recording medium holding means can be changed.
[0082]
In this embodiment, the holding portion 61 is formed with a plurality of ink receiving openings 612a, 612b, 612c, and 612d corresponding to the widths of the various recording media.
[0083]
On the lower surface side of the holding portion 61, a slide plate 66 having a size capable of covering at least all the openings 612a, 612b, 612c, 612d is slid in a direction along the main scanning direction as shown in FIG. The contact is possible.
[0084]
The slide plate 66 is formed with only one opening 661 having the same size as the openings 612a, 612b, 612c, and 612d. By sliding the slide plate 66, the relative position with respect to the holding unit 61 is increased. In other words, the opening 661 can selectively fit with any one of the openings 612a, 612b, 612c, and 612d of the holding portion 61.
[0085]
As a result, a borderless image can be recorded with a single recording device corresponding to recording media of a plurality of types of widths.
[0086]
Further, when recording is performed by attracting the narrowest recording medium to the surface of the holding unit 61, the recording medium can be obtained by sliding the slide plate 66 so that the opening 661 of the slide plate 66 can be fitted only to the opening 612 d of the holding unit 61. Since the suction holes 611 and the openings 612a, 612b, and 612c in the region where no air is present can be shielded by the slide plate 66, the slide plate 66 also functions as a shield plate, eliminating waste of air leakage and reducing the suction force. Decrease can be prevented.
[0087]
The slide operation of the slide plate 66 may be performed manually by an operator, or may be automatically performed by driving a drive motor 663 as shown in FIG. In the case of automation, it is preferable that a sensor hole 662 is appropriately formed in the slide plate 66, and the position of the slide plate 66 is detected by reading the sensor hole 662 with the sensor 664.
[0088]
11 and 12, only one opening 661 is formed in the slide plate 66. However, the number of openings formed in the slide plate 66 is not limited to one. It is only necessary that the number of openings 612a, 612b, and 612c formed in the holding portion 61 is smaller than the number of openings. Accordingly, a plurality of openings (for example, up to three in the embodiment shown in FIGS. 11 and 12) are formed in the slide plate 66, and the positions of the openings are selectively changed by changing the relative position with the holding part 61. It can also be adapted to. In this manner, the desired opening of the holding unit 61 and the opening of the sliding plate 66 are matched with a minimum amount of sliding by combining the positions of the plurality of openings of the sliding plate 66 and the opening of the holding unit 61. Can be processed quickly.
[0089]
FIG. 13 shows an aspect in which the suction area of the suction hole formed in the holding portion of the recording medium holding means can be changed.
[0090]
In this embodiment, the strip-shaped shielding plate 67 is slidably brought into contact with the surface of the holding portion 61 of the recording medium holding means 6.
[0091]
The band-shaped shielding plate 67 is formed of a thin and strong band-shaped body having flexibility such as a steel belt, for example. Both ends are wound around rollers 671 and 672, respectively, and the recording medium is conveyed by rotating the rollers 671 and 672. Along the direction, they are provided on the surface of the holding portion 61 so as to be slidable corresponding to the rows of the recording media 10A and 10B.
[0092]
As shown in FIG. 13B, the belt-shaped shielding plate 67 is set with a plurality of regions, that is, four types of X1, X2, X3, and X4 in the illustrated example, and within each region X1, X2, X3, and X4. Only, the opening 673 of the position and magnitude | size which fits each suction hole 611 of the holding | maintenance part 61 along the conveyance direction of this strip | belt-shaped shielding board 67 is formed. Accordingly, the number of holes that can be matched with the suction holes 611 of the holding portion 61 is different in each of the regions X1, X2, X3, and X4.
[0093]
By sliding the band-shaped shielding plate 67 and selectively matching one of the areas with the surface of the holding section 61, an opening 673 formed in the area of the band-shaped shielding plate 67 and the holding section 61 corresponding thereto. Air is sucked only from the suction holes 611, and the suction holes outside the other regions are shielded by the band-shaped shielding plate 67, and air is not sucked from there. By appropriately sliding the belt-shaped shielding plate 67, it is possible to easily change to a plurality of types of regions X1, X2, X3, and X4.
[0094]
The sliding operation of the band-shaped shielding plate 67 may be performed manually by an operator or automatically by driving the rollers 671 and 672 by appropriate driving means.
[0095]
If the areas X1, X2, X3, and X4 are areas having sizes corresponding to the widths of various recording media, when the width of the recording medium is changed, only the portion where the recording medium exists is sucked. In addition, since the suction hole 611 in the area where no recording medium exists can be closed by the belt-shaped shielding plate 67, it is possible to eliminate the waste of air leakage and to prevent the suction force from decreasing.
[0096]
In addition, a plurality of ink receiving openings for receiving surplus ink are formed in the holding portion 61 at the same time so as to correspond to the widths of various recording media as shown in FIG. As described above, by forming openings 674a to 674d and 675a to 675d in each of the regions X1, X2, X3, and X4 of the belt-shaped shielding plate 67 that can be matched with any of these openings, the width of the recording medium can be accommodated. Thus, the position of the ink receiving opening can be changed at the same time. At this time, an unnecessary opening of the holding portion 61 is shielded by the belt-shaped shielding plate 67, so that there is no trouble in suction and suction.
[0097]
Further, the band-shaped shielding plate 67 is slightly shifted in the conveying direction, whereby the relative position between the suction hole 611 of the holding unit 61 and the opening 673 in each of the regions X1, X2, X3, and X4 of the band-shaped shielding plate 67. Can be changed to cancel the compatible state of both. Accordingly, since the suction hole 611 of the holding unit 61 is shielded by the strip-shaped shielding plate 67, the strip-shaped shielding plate 67 serves as a shutter that blocks the adsorption of the recording medium to the surface of the holding unit 61. When the recording medium is conveyed, if the suction to the surface of the holding portion 61 of the recording medium is temporarily blocked by the belt-like shielding plate 67 in this way, the suction means itself having a slow response to the start and stop operations is stopped to stop the suction. Since there is no need to cancel the operation, the recording medium can be transported quickly and smoothly.
[0098]
As another mode for temporarily releasing the adsorption state of the recording medium on the surface of the holding unit 61, as shown in FIG. 14, as shown in FIG. It is also preferable that the shielding plate 68 having the opening 681 having a size is slidably contacted in a direction along the main scanning direction.
[0099]
The shielding plate 68 is slid by driving of the drive motor or manual operation to change the relative position between the holding portion 61 and the shielding plate 68, and the suction hole 611 of the holding portion 61 and the opening 681 of the shielding plate 68 are changed. By releasing the conforming state, the shielding plate 68 functions as a shutter, and the suction hole 611 of the holding portion 61 is shielded. Thereby, the adsorption | suction state to the holding | maintenance part 61 surface can be cancelled | released quickly and smoothly.
[0100]
Further, as shown in FIG. 15, an opening / closing valve 69 is interposed in the suction path with the suction means connected to the negative pressure chamber 62, and the opening / closing valve 69 is controlled and temporarily closed to thereby remove the suction means. The suction of air in the negative pressure chamber 62 may be temporarily blocked.
[0101]
16 and 17 show a mode in which the suction from the suction holes 611 of the holding unit 61 is individually controlled in each row of the recording media 10A and 10B.
[0102]
FIG. 16 shows an example in which the inside of the negative pressure chamber 62 of the recording medium holding means 6 is divided into two by a partition wall 623 corresponding to each row of the recording media 10A and 10B.
[0103]
Suction means 65A and 65B are individually connected to the negative pressure chambers 624A and 624B partitioned by the partition wall 623, and the respective negative pressure chambers 624A and 624A are controlled by controlling the driving of the suction means 65A and 65B. 624B can be individually suction controlled.
[0104]
As a result, the suction of the negative pressure chambers 624A or 624B in a row that does not need to convey the recording medium can be stopped, and the suction means can suck only either the negative pressure chambers 624A or 624B. Therefore, it can save energy.
[0105]
FIG. 17 shows an example in which the shielding plate 68 shown in FIG. 14 is provided corresponding to each row of the recording media 10A and 10B.
[0106]
Since the suction holes 611 corresponding to the rows of the recording media 10A and 10B can be individually shielded by the respective shielding plates 68A and 68B, the suction of air from the suction holes 611 can be controlled individually for each row. .
[0107]
According to this, since suction control of each row can be performed individually by one suction means 65, only one suction mechanism is required. Further, since suction control can be performed without controlling the driving of the suction means 65 itself, quick and smooth control is possible.
[0108]
Further, in place of the shielding plates 68A and 68B, the belt-like shielding plates 67 shown in FIG. 13 are individually arranged corresponding to the respective rows so that the suction of each row is individually controlled. Control is possible.
[0109]
FIG. 18 shows a mode for discharging excess ink stored in the ink receiving portion.
[0110]
In the drawing, the ink receiving portion 63 disposed in the negative pressure chamber 62 is positioned so that the discharge port 631 for discharging the excess ink W stored therein faces the negative pressure chamber 62 via the on-off valve 632. is doing.
[0111]
Therefore, by opening the on-off valve 632, the ink receiving portion 63 and the negative pressure chamber 62 communicate with each other, and excess ink W stored in the ink receiving portion 63 is discharged by the suction force of the suction means. This opening / closing control of the on-off valve 632 is performed during non-recording by the recording means 3 in order to prevent a reduction in suction force during image recording.
[0112]
As a result, the excess ink can be discharged smoothly using the suction force of the suction means.
[0113]
In the above description, the recording mediums 10A and 10B have been described as having a long shape supplied from the paper rolls 1A and 1B. However, the recording medium may be a sheet-shaped recording medium that has been appropriately cut into sizes. Of course.
[0114]
【The invention's effect】
According to the present invention, it is possible to provide an ink jet recording apparatus that can prevent the occurrence of lifting at both side edges of a recording medium and perform high-quality image recording.
[0115]
Further, according to the present invention, it is possible to provide an ink jet recording apparatus that can easily cope with the case of recording an image on various recording media having different widths.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an outline of an ink jet recording apparatus.
2A is a partial plan view showing a recording medium holding means, and FIG. 2B is a side sectional view taken along line bb.
FIGS. 3A to 3C are partial plan views showing other examples of the suction portion.
FIG. 4 is a partial plan view showing an example in which the attracting portion is an electrostatic attracting portion.
FIGS. 5A to 5C are explanatory views showing other examples of electrostatic attraction units. FIGS.
FIG. 6 is a partial plan view showing still another example of the electrostatic attraction unit.
FIG. 7 is a partial perspective view showing another example of the recording medium holding member.
8 is a partial plan view of FIG. 7;
FIG. 9 is a perspective view showing still another example of the recording medium holding unit.
FIG. 10 is a plan view showing a replacement holding unit.
FIG. 11 is an explanatory view showing another example of a holding unit.
FIG. 12 is a partial plan view showing another example of a holding unit.
13A is a partial perspective view showing still another example of the recording medium holding means, and FIG. 13B is a plan view showing a belt-shaped shielding plate.
FIG. 14 is a partial plan view showing still another example of the holding unit.
FIG. 15 is a side sectional view showing still another example of the recording medium holding means.
FIG. 16 is a perspective view showing still another example of the recording medium holding unit.
FIG. 17 is a perspective view showing still another example of the recording medium holding unit.
FIG. 18 is a perspective view showing still another example of the recording medium holding unit.
FIGS. 19A and 19B are plan views showing a holding portion of a conventional recording medium holding means.
[Explanation of symbols]
1: Recording medium holding means
2: Conveying means
3: Recording means
6: Recording medium holding means

Claims (4)

A recording medium supplying means for supplying a recording medium; a conveying means for conveying the recording medium; a recording means for scanning the width of the recording medium and ejecting ink; In an ink jet recording apparatus having a recording medium holding means for holding and preventing lifting,
The recording medium holding means is provided with an ink receiving opening for receiving surplus ink ejected when recording is performed in a larger range than the recording medium in a holding portion in contact with the back surface of the recording medium,
An ink jet recording apparatus characterized in that the position of the opening can be changed according to the width of the recording medium. The holder is configured to be replaceable, and the holder is replaced with one of a plurality of types of holders each having an ink receiving opening corresponding to the width of the recording medium. 2. The ink jet recording apparatus according to claim 1, wherein the position of the receiving opening can be changed. A smaller number of openings smaller than the above openings are formed on the lower surface of the holding portion formed by forming ink receiving openings at positions corresponding to the widths of the various recording media. The sliding plate is slidably contacted, and the relative position between the holding portion and the sliding plate is changed to selectively fit one of the opening portions of the holding portion and the opening of the sliding plate, thereby receiving ink. The ink jet recording apparatus according to claim 1, wherein the position of the opening for use is changeable. A recording medium supplying means for supplying a recording medium; a conveying means for conveying the recording medium; a recording means for scanning the width of the recording medium and ejecting ink; In an ink jet recording apparatus having a recording medium holding means for holding and preventing lifting,
The recording medium holding means includes a holding portion having a plurality of suction holes in contact with the back surface of the recording medium, a negative pressure chamber provided on the lower surface side of the holding portion, and a negative pressure chamber connected to the negative pressure chamber to draw air from the suction holes. A suction means for attracting the recording medium to the holding portion by suction; an ink receiving portion provided in the negative pressure chamber for receiving surplus ink ejected when recording is performed in a larger range than the recording medium; Have
The ink receiving portion has a discharge port for discharging excess ink stored therein facing the negative pressure chamber through an on-off valve,
An ink jet recording apparatus, characterized in that the excess ink in the ink receiving portion is discharged by the suction force of the suction means by opening the on-off valve during non-recording by the recording means.

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