JP2004284183A - Ink jet recorder - Google Patents

Ink jet recorder Download PDF

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Publication number
JP2004284183A
JP2004284183A JP2003078922A JP2003078922A JP2004284183A JP 2004284183 A JP2004284183 A JP 2004284183A JP 2003078922 A JP2003078922 A JP 2003078922A JP 2003078922 A JP2003078922 A JP 2003078922A JP 2004284183 A JP2004284183 A JP 2004284183A
Authority
JP
Japan
Prior art keywords
paper
sheet
platen
ink
ink jet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003078922A
Other languages
Japanese (ja)
Inventor
Noboru Endo
Hisashi Kinoshita
Hiroaki Mogi
久之 木下
宏明 茂木
登 遠藤
Original Assignee
Fuji Xerox Co Ltd
富士ゼロックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd, 富士ゼロックス株式会社 filed Critical Fuji Xerox Co Ltd
Priority to JP2003078922A priority Critical patent/JP2004284183A/en
Publication of JP2004284183A publication Critical patent/JP2004284183A/en
Pending legal-status Critical Current

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Abstract

Provided is an ink jet recording apparatus provided with a low-cost vacuum apparatus with a simple structure that can perform paper suction and ink mist collection with one fan.
A mist collection duct (12) having a plurality of suction ports (28) is provided on a conveyance path surface of a sheet (P), and further, a duct (16) connecting the platen (14) and the mist collection duct (12), and a negative pressure generated inside the duct (16). An exhaust fan 18 to be opened, a first damper 30 provided to be openable and closable between the mist collection duct 12 and the duct 16, and a second damper 31 provided to be substantially openable and closable between the platen 14 and the exhaust fan 18. I have. By opening and closing the first damper 30 and the second damper 31, the negative pressure of the exhaust fan 18 can be guided to the mist collection duct 12 or cut off.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inkjet recording device.
[0002]
[Prior art]
In recent years, in an ink jet recording apparatus, if the print head is made longer to improve the processing speed, it is necessary to further stabilize the posture of the paper in the print area, and a mechanism such as suctioning and holding the paper at a platen portion is employed. .
[0003]
On the other hand, there is a tendency that the diameter of ink droplets is reduced in order to improve image quality, and that the image density and resolution are increased. However, by reducing the ink droplet diameter, more fine ink particles, i.e., ink mist, are generated at the same time as the ink droplets are formed at the time of image formation, and stay in the vicinity of the ink jet recording head, adhere to the recording paper, and contaminate the image. Or the paper adheres to the transport path inside the machine to contaminate the paper.
[0004]
As a countermeasure, there has been proposed an ink jet recording apparatus having a structure in which a negative pressure generated by an exhaust fan is guided to the vicinity of a recording head by a duct to suck ink mist (for example, see Patent Documents 1 and 2).
[0005]
As shown in FIG. 4, the inkjet recording apparatus 100 includes a mist collection duct 102 for collecting ink mist and a platen 104 for attracting a sheet by negative pressure. An exhaust fan 106 is used for ink mist collection and paper suction, respectively. Exclusive exhaust fans 106 are provided in the mist collection duct 102 and the platen 104, and air is sucked and discharged as shown by arrows. . Thus, the ink mist is collected and the sheet is conveyed by suction.
[0006]
However, if a plurality of exhaust fans are used for collecting ink mist and adsorbing paper, problems such as a complicated structure, an increase in the size of the apparatus, and an increase in noise occur.
[0007]
Further, in the method of Patent Document 1, the air flow for sucking the paper is used for sucking the ink mist, and the ink mist is sucked and removed from the holes provided in the platen for sucking the paper. However, it does not eliminate the disadvantage that the ink mist is guided in the direction of the platen, and the surface of the platen and, consequently, the back surface of the paper are contaminated.
[0008]
Further, in the method of Patent Document 2, the cooling of the inside of the device and the removal of the ink mist are performed by one fan, but the suction of the paper is performed by a separate fan, so that the device is provided with a plurality of intake fans. It is necessary to complicate the structure, increase the size of the device, and increase the cost.
[0009]
[Patent Document 1]
JP-A-62-218133 (FIG. 14, page 8 to page 9)
[Patent Document 2]
JP-A-7-17037 (FIG. 1, page 4 to page 8)
[0010]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described circumstances, and has as its object to provide an ink jet recording apparatus having a simple structure and a low-cost vacuum apparatus that can perform paper suction and ink mist collection with a single fan.
[0011]
[Means for Solving the Problems]
2. An ink jet recording apparatus according to claim 1, wherein said ink jet recording apparatus discharges ink droplets onto a sheet based on image information. And a sheet suction means for sucking the sheet at a position, wherein the mist collecting means and the sheet suction means are negatively pressured by the same fan.
[0012]
In the invention having the above configuration, the same fan is used to suction the ink mist and the paper suction means for stabilizing the paper posture during printing are set to a negative pressure, thereby reducing the number of fans to one while providing two vacuum devices. A low-cost vacuum apparatus with a simple structure can be obtained.
[0013]
An ink jet recording apparatus according to a second aspect of the invention is characterized in that the ink jet recording apparatus further comprises an opening / closing means provided in the mist collecting means, for opening / closing a suction port through which air is sucked by the fan.
[0014]
In the invention having the above-described configuration, the capacity of the fan can be effectively used by restricting the intake of the mist collecting means as needed, and the negative pressure applied to the sheet suction means can be adjusted.
[0015]
The ink jet recording apparatus according to claim 3, wherein the opening / closing means is closed at the time of starting the conveyance of the sheet, and the leading end of the sheet is nipped by a first pair of conveying rollers downstream of the recording head in the conveying direction. The opening / closing means is opened, and the opening / closing means is closed a predetermined time earlier than the rear end of the sheet passes through the last pair of conveying rollers upstream of the recording head in the conveying direction.
[0016]
In the invention having the above configuration, at the stage before printing where no mist is generated and the leading edge of the sheet easily deviates from the conveyance path surface due to curl or the like, the negative pressure of the fan is used to suck the sheet, and the leading edge of the sheet passes through the recording head. If the paper is nipped by the pair of transport rollers, the paper suction force is reduced, the mist generated at the start of printing is started to be sucked, and when the trailing edge of the paper comes off the nip of the pair of transport rollers and passes through the recording head, the paper is sucked again. Use fan negative pressure.
[0017]
As a result, it is possible to efficiently suck the mist while preventing an accident in which the leading end of the sheet is not properly nipped by the conveying roller pair, contacts the recording head to form a JAM, or prevents the trailing end of the sheet from contacting the ejection surface of the head. .
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an ink jet recording apparatus according to the first embodiment of the present invention.
[0019]
As shown in FIG. 1, the inkjet recording apparatus 10 has a first transport roller pair 20 for nipping and transporting a sheet P, a platen 14 having a hollow structure for holding the sheet P by sucking the sheet P by a suction hole 15, and a shaft 24. A recording head 22 for forming an image on the paper P while reciprocating the paper P, and a second transport roller pair 26 for nipping the leading end of the paper passing through the platen 14 are provided. The sheet P is pinched and conveyed by the first pair of conveying rollers 20, moves on the platen 14, is printed by the recording head 22, and is pinched and conveyed by the second pair of conveying rollers 26. At this time, since the ink ejected from the recording head 22 adheres to the recording surface of the paper P, the rollers for holding the paper recording surface side of the second pair of conveying rollers 26 as shown in FIG. It is a so-called star wheel.
[0020]
A mist collection duct 12 extending in the sheet width direction and provided with a plurality of suction ports 28 near the moving position of the recording head 22 is provided on the conveyance path surface of the sheet P, and further connects the platen 14 and the mist collection duct 12. A duct 16 and an exhaust fan 18 for generating a negative pressure inside the duct 16 are provided, and air is sucked in from the suction hole 15 provided in the platen 14 and the suction port 28 provided in the duct 16 as shown in FIG. Discharge from 18.
[0021]
A first damper 30 is provided between the mist collection duct 12 and the duct 16 so as to be openable and closable, and a second damper 31 is provided between the platen 14 and the exhaust fan 18 so as to be substantially openable and closable. By opening and closing the first damper 30, the negative pressure of the exhaust fan 18 can be guided to the mist collection duct 12 or cut off. Similarly, by opening and closing the second damper 31, the negative pressure of the exhaust fan 18 can be guided to the platen 14 or attenuated. Even if the second damper 31 is closed, the negative pressure of the exhaust fan 18 is not completely shut off, and is guided to the platen 14 to some extent while attenuating.
[0022]
Further, a filter 19 is detachably provided between the exhaust fan 18 and the duct 16 so that ink mist, paper dust, and the like sucked when the exhaust fan 18 operates are not scattered in the apparatus.
[0023]
FIG. 2 is a timing chart showing the operation from the start to the end of printing of the inkjet recording apparatus according to the first embodiment of the present invention.
[0024]
2A shows the operation of the recording head 22, FIG. 2B shows the operation of the first and second conveying roller pairs 20, 26, FIG. 2C shows the operation of the exhaust fan 18, and FIG. 2D shows the operation of the first damper 30.
[0025]
When the printing operation is started in (1), first, the intake fan 18 is operated, and a negative pressure is introduced into the platen 14 via the duct 16. The platen 14 having a negative pressure inside can suck and transport the sheet P by the suction hole 15. At this time, as shown in FIG. 2D, since the first damper 30 is in the closed state, all negative pressure is applied to the platen 14.
[0026]
Subsequent to the activation of the exhaust fan 18, movement in the sub-scanning direction, that is, paper feeding is started. FIG. 2B shows the operation of the first and second transport roller pairs 20, 26. When the leading edge of the paper P is carried out from the first transport roller pair, the paper P is attracted by the suction hole 15 of the platen 14 to which the negative pressure is applied as described above, and the leading edge of the paper P is transported in a state of being in close contact with the platen 14. As a result, it is possible to avoid a situation in which the leading edge of the sheet P, which is most affected by the curl, rises and comes into contact with the recording head 22 to cause JAM. (▲ 2 ▼)
When the conveyance of the paper P proceeds and an image is formed on the paper P on the platen 14 by ink droplets discharged from the recording head 22, ink mist starts to be generated with the discharge of the ink droplets. If the sheet P passes through the suction area of the platen 14 and becomes free again, if the suction force of the platen 14 is reduced, the leading end position of the sheet P becomes unstable. The negative pressure is applied only to the platen 14 until the floating is no longer a concern.
[0027]
If the leading edge of the paper P is further nipped by the second transport roller pair 26, the paper P is transported stably without being lifted, and the damper 30 is opened at this time, that is, at the timing indicated by (3). Then, a negative pressure is also applied to the mist collection duct 12 to start sucking the mist from the suction port 28.
[0028]
Here, even if a negative pressure is applied to the mist collection duct 12 side by opening the first damper 30, the negative pressure to the platen 14 side is not reduced to zero. Since both ends of the sheet P are sandwiched between the first and second transport roller pairs 20 and 26, there is no fear that the sheet P collides with the recording head 22, but cockling occurs due to the sheet P getting wet with ink, As a result of the waving of the paper P, there is a possibility that the printing surface of the paper P comes into contact with the ink ejection surface of the recording head 22 and that printing stains occur. For this reason, a negative pressure is always applied to the platen 14 during the printing operation. At the time of ink mist collection, the negative pressure is dispersed to the mist collection duct 12 side, so that the suction force is reduced. ing.
[0029]
In addition, while the mist is being collected, the suction force between the sheet P and the platen 14 is weakened. However, the strong suction of the sheet P increases the frictional resistance between the sheet P and the platen 14, resulting in poor sheet feeding during conveyance or JAM. The effect of avoiding such a situation can be expected.
[0030]
When the printing operation proceeds and the trailing edge of the paper P approaches the first transport roller pair 20, the damper 30 is closed again as shown in (4), and the ink mist collection by the mist collection duct 12 ends. At the same time, all the negative pressure is applied to the platen 14, so that the sheet P is strongly attracted.
[0031]
This is because when the trailing edge of the paper P passes through the first transport roller pair 20 and becomes free, if the suction by the platen 14 is weak, the trailing edge of the paper P rises due to curling or cockling, and the ink ejection surface of the recording head 22 This is because there is a possibility that a print smear occurs due to contact with the image. For this purpose, the first damper 30 is closed when the rear end of the paper P is nipped by the first transport roller pair 20, and the suction force of the platen 14 is increased when the rear end of the paper P becomes free. Need to be kept. Therefore, the rear end position of the paper P is detected by the rotation amount of the conveying roller or a sensor (not shown), and the first damper 30 is closed when the rear end approaches the first conveying roller pair 20 to a preset distance.
[0032]
FIG. 3 is a flowchart showing the operation from the start to the end of printing of the inkjet recording apparatus according to the first embodiment of the present invention.
[0033]
At step 40, printing is started. At step 42, the power supply of the exhaust fan 18 is turned on. Here, a negative pressure is generated inside the duct 16. By closing the first damper 30 in step 44 and opening the second damper 31 in step 46, the negative pressure is guided to the platen 14, and the outside air is sucked through the suction hole 15.
[0034]
Next, in step 48, the leading edge of the sheet P is conveyed to the platen 14 so that the leading edge of the sheet P is attracted to the platen 14, thereby preventing the leading edge of the sheet P from rising due to curling or cockling.
[0035]
Further, when the leading edge of the sheet P is transported to the second transport roll pair 26 in step 50, the leading edge is physically pinched by the second transport roll pair 26 without strongly adsorbing the sheet P. There is no need to apply a strong negative pressure.
[0036]
Therefore, by opening the first damper 30 and closing the second damper 31 in step 52, the negative pressure of the exhaust fan 18 is mainly directed from the platen 14 to the duct 16. Therefore, a negative pressure is introduced into the duct 16, and the ink mist is sucked through the suction port 28.
[0037]
Here, even if the second damper 31 is closed, the negative pressure on the platen 14 is not completely shut off, so that the paper P being transported is transported on the platen 14 while maintaining a stable flat surface. At this time, the negative pressure of the platen 14 attenuates because the second damper 31 is closed, and the frictional resistance between the sheet P and the platen 14 does not affect the transportability.
[0038]
When the paper P is further conveyed, the rear end is separated from the first conveying roller pair 20 in step 54, and conveyed to the platen 14, the first damper 30 is closed and the second damper 31 is opened in step 56. You. Therefore, the negative pressure is not guided to the duct 16, but is guided to the platen 14, so that the sheet P is strongly attracted. Thus, it is possible to prevent the rear end of the sheet P from being lifted by curling or cockling and coming into contact with the ink ejection surface of the recording head 22 or the like.
[0039]
With the above-described configuration, the present embodiment can provide an ink jet recording apparatus having a simple structure and a low-priced vacuum apparatus capable of performing paper suction and ink mist collection with a single fan.
[0040]
FIG. 4 shows an ink jet recording apparatus according to a second embodiment of the present invention.
[0041]
As shown in FIG. 4, the ink jet recording apparatus 11 is provided with a platen 14 and a mist collection duct 12, and an exhaust fan 18 that uses these as a negative pressure is provided at the center of the mist collection duct 12 in the main scanning direction.
[0042]
The mist collection duct 12 is provided with a damper 32 that can open and close the suction port 28. By closing the damper 32, the suction port 28 is closed and the negative pressure of the exhaust fan 18 can be applied to the platen 14. The mist collection duct 12 and the platen 14 are connected at both ends by ducts 16, and the negative pressure from the exhaust fan 18 is led to the platen 14 and the mist collection duct 12 without bias in the main scanning direction, and sucks air as shown in the figure. I do.
[0043]
This is because if the exhaust fan 18 is provided only in one of the main scanning directions, the suction force of the paper P will be deviated in the main scanning direction, and if the suction force of the platen 14 is partially increased, the transportability may be adversely affected. For this reason, the exhaust fan 18 is provided at the center of the mist collection duct 12 in the main scanning direction (= paper width direction) in order to eliminate the bias of the suction force in the paper width direction.
[0044]
Further, although the damper 32 is provided for each suction port 28, only one damper 32 having a size to cover all the suction ports 28 may be provided.
[0045]
With this embodiment having the above configuration, it is possible to obtain an ink jet recording apparatus in which the sheet suction and the ink mist collection can be performed by one fan and the sheet suction is not biased.
[0046]
【The invention's effect】
ADVANTAGE OF THE INVENTION In the inkjet recording device which concerns on this invention, it can be set as the inkjet recording device provided with the low-cost vacuum apparatus with a simple structure which can perform paper adsorption | suction and ink mist collection with one fan.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an ink jet recording apparatus according to a first embodiment of the present invention.
FIG. 2 is a timing chart showing an operation of the ink jet recording apparatus according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing an operation of the ink jet recording apparatus according to the first embodiment of the present invention.
FIG. 4 is a perspective view showing an ink jet recording apparatus according to a second embodiment of the present invention.
FIG. 5 is a perspective view showing a conventional ink jet recording apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Ink jet recording apparatus 12 Mist collection duct 14 Platen 15 Adsorption hole 16 Duct 18 Exhaust fan 20 First transport roll pair 22 Recording head 26 Second transport roll pair 28 Inlet 30 First damper 31 Second damper 32 Damper

Claims (3)

  1. An ink jet recording apparatus that ejects ink droplets on paper based on image information,
    Mist collecting means for sucking and removing ink mist generated when ejecting ink droplets,
    Paper suction means for sucking the paper at the transport position,
    The ink jet recording apparatus according to claim 1, wherein the mist collecting unit and the sheet suction unit are set to a negative pressure by the same fan.
  2. 2. The ink jet recording apparatus according to claim 1, further comprising an opening / closing unit provided in the mist collection unit, for opening and closing a suction port through which air is sucked by the fan.
  3. At the start of transport of the paper, close the opening and closing means,
    Opening the opening and closing means when the leading end of the sheet is sandwiched by the first pair of conveying rollers downstream of the recording head in the conveying direction,
    3. The ink jet recording apparatus according to claim 2, wherein the opening / closing means is closed earlier by a predetermined time than a rear end of the sheet passes through a last pair of conveying rollers upstream of the recording head in the conveying direction. .
JP2003078922A 2003-03-20 2003-03-20 Ink jet recorder Pending JP2004284183A (en)

Priority Applications (1)

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JP2003078922A JP2004284183A (en) 2003-03-20 2003-03-20 Ink jet recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003078922A JP2004284183A (en) 2003-03-20 2003-03-20 Ink jet recorder

Publications (1)

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Family Applications (1)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007216639A (en) * 2006-02-20 2007-08-30 Seiko Epson Corp Liquid jetting device, and treating liquid mist retrieving method
JP2007253465A (en) * 2006-03-23 2007-10-04 Noritsu Koki Co Ltd Image forming device
KR100848075B1 (en) 2005-11-11 2008-07-24 후지제롯쿠스 가부시끼가이샤 Image forming apparatus
WO2008149759A1 (en) * 2007-06-07 2008-12-11 Seiko I Infotech Inc. Carriage unit and ink-jet recording device
JP2009061590A (en) * 2007-09-04 2009-03-26 Ricoh Co Ltd Liquid jetting device and image forming apparatus
JP2010269609A (en) * 2010-09-10 2010-12-02 Seiko Epson Corp Waste liquid device
CN102470678A (en) * 2009-07-31 2012-05-23 西尔弗布鲁克研究股份有限公司 Printing system with fixed printheads and movable vacuum platen
CN102514393B (en) * 2007-10-25 2014-07-02 精工爱普生株式会社 Inkjet printer
JP2014166918A (en) * 2013-01-29 2014-09-11 Kyocera Document Solutions Inc Paper conveying device and image forming device provided with the paper conveying device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100848075B1 (en) 2005-11-11 2008-07-24 후지제롯쿠스 가부시끼가이샤 Image forming apparatus
JP2007216639A (en) * 2006-02-20 2007-08-30 Seiko Epson Corp Liquid jetting device, and treating liquid mist retrieving method
JP2007253465A (en) * 2006-03-23 2007-10-04 Noritsu Koki Co Ltd Image forming device
JP4731367B2 (en) * 2006-03-23 2011-07-20 Nkワークス株式会社 Image forming apparatus
WO2008149759A1 (en) * 2007-06-07 2008-12-11 Seiko I Infotech Inc. Carriage unit and ink-jet recording device
JP2009061590A (en) * 2007-09-04 2009-03-26 Ricoh Co Ltd Liquid jetting device and image forming apparatus
CN102514393B (en) * 2007-10-25 2014-07-02 精工爱普生株式会社 Inkjet printer
CN102470678A (en) * 2009-07-31 2012-05-23 西尔弗布鲁克研究股份有限公司 Printing system with fixed printheads and movable vacuum platen
JP2010269609A (en) * 2010-09-10 2010-12-02 Seiko Epson Corp Waste liquid device
JP2014166918A (en) * 2013-01-29 2014-09-11 Kyocera Document Solutions Inc Paper conveying device and image forming device provided with the paper conveying device

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