JP2011183746A - Liquid ejector - Google Patents

Abstract

A liquid ejecting apparatus that suppresses paper dust generated from a printing medium from adhering to a liquid ejecting head is provided.
A printer that ejects ink droplets from a liquid ejecting head to a recording paper P conveyed to a printing area 50 by a paper feeding roller 11, a paper feeding roller 12, and a paper discharging roller 13 is provided on the recording paper P. A casing 23 including the upstream side of the print area 50 in the transport path, a neutralizing brush 31 disposed in the casing 23 to contact the recording paper P and neutralize the recording paper P, and a static elimination in the casing 23 A paper dust removing device 20 having an air blower 36 disposed on the downstream side of the brush 31 and blowing air onto the recording paper is provided.
[Selection] Figure 1

Description

  The present invention relates to a liquid ejecting apparatus that ejects liquid onto a print medium, and more particularly to a liquid ejecting apparatus that ejects liquid onto a paper print medium.

  As an example of a liquid ejecting apparatus that ejects liquid onto a print medium, an ink jet printer that ejects ink as liquid onto recording paper as a print medium is known. A liquid ejecting head included in an ink jet printer includes a nozzle plate having a nozzle forming surface on which a plurality of nozzles are formed. In the ink jet printer, minute ink droplets are ejected from the nozzle toward the recording paper side with respect to the nozzle formation surface while relatively moving the recording paper supported by the platen and the liquid ejecting head. As a result, characters and figures are printed on the recording paper.

  By the way, in a paper print medium such as a recording paper, paper dust is generated when a part of paper fibers constituting the print medium is cut off in the process of transporting the print medium. At this time, paper dust floating between the recording paper and the nozzle formation surface may adhere to the nozzle formation surface. When such paper dust adheres to the vicinity of the nozzle, the flight direction of the ink droplet ejected from the nozzle is changed or the nozzle is blocked, which causes a printing failure on the recording paper. Therefore, in Patent Document 1, a fan that blows air from an oblique direction in accordance with the moving direction of the liquid ejecting head is provided on a scheduled print portion of the recording paper on a carriage that transports the liquid ejecting head. Then, by driving the fan in accordance with the moving direction of the liquid ejecting head, the paper dust adhering to the scheduled print portion of the recording paper is removed.

Japanese Patent Laid-Open No. 2003-118095

  On the other hand, in the configuration in which air is blown from the carriage on which the liquid ejecting head is mounted to the planned print site as in Patent Document 1, paper dust can be removed from the planned print site, but from the planned print site. It is difficult to define the path along which the blown paper dust flies and the position where the paper dust falls. In particular, since air current is easily disturbed between the recording paper and the liquid jet head, there is a possibility that the paper dust blown off from the scheduled printing portion will continue to float between the nozzle forming surface and the recording paper.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid ejecting apparatus that suppresses paper dust generated from a print medium from adhering to a liquid ejecting head.

  The liquid ejecting apparatus according to the aspect of the invention is a liquid ejecting apparatus that ejects liquid from the liquid ejecting head to a print medium that is transported to a print region that faces the liquid ejecting head, and the printing in the transport path of the print medium A housing that forms a space isolated from the liquid ejecting head on the upstream side of the region, and an air supply unit that is provided in the housing and supplies air toward the print medium conveyed in the housing It is a summary to provide.

According to the liquid ejecting apparatus of the present invention, the paper dust adhered to the print medium is separated from the print medium by the air blown by the air supply unit. Then, the paper dust separated from the print medium flies within the housing, which is a space isolated from the liquid ejecting head and formed on the upstream side of the print region. Thus, paper dust can be removed from the print medium before being conveyed to the printing area, and the removed paper powder can be prevented from flying toward the printing area. Therefore, it is possible to suppress the paper dust from adhering to the liquid ejecting head.

  In the liquid ejecting apparatus, the air supply unit supplies air to the printing surface from a direction inclined with respect to the printing surface of the printing medium so that air flows from the downstream side to the upstream side in the conveyance direction of the printing medium. The main point is to supply.

  According to this liquid ejecting apparatus, since air is blown onto the print medium so that the air flows from the downstream side to the upstream side in the conveyance direction of the print medium, the paper dust separated from the print medium is upstream in the conveyance direction. Fly toward the side. Therefore, it is possible to suppress the paper dust from adhering again to the portion of the print medium from which the paper dust has already been removed.

  Moreover, when blowing air on a printing medium and blowing paper dust off, the one where the flow velocity of the air on the printing surface of a printing medium is large is preferable. When air is blown from the direction perpendicular to the printing surface of the print medium, it is difficult to increase the air flow velocity on the surface of the print medium, and although the blown air is inside the housing, There is a concern that it may be divided into an upstream side and a downstream side. In this regard, according to the liquid ejecting apparatus having the above-described configuration, it is possible to easily increase the air flow velocity on the printing surface of the printing medium.

The gist of the liquid ejecting apparatus is provided in the casing, and further includes an exhaust unit that exhausts air from the casing on the upstream side of the casing in the transport direction of the print medium.
According to this liquid ejecting apparatus, the paper dust floating in the casing is exhausted out of the casing by the exhaust section. At this time, the air in the housing is exhausted upstream in the conveyance direction of the print medium, that is, toward the opposite side of the printing area, so that the airflow in the housing can be stabilized and exhausted outside the housing. It is also possible to suppress paper dust flying toward the printing area.

  The gist of the liquid ejecting apparatus is that the liquid ejecting apparatus includes a charge eliminating member that is provided in the casing and removes the print medium on the upstream side of the air supply unit in the conveyance direction of the print medium.

  Here, the print medium and the paper dust adhering to the print medium are easily charged by friction with other members. And since paper dust having a polarity opposite to that of the print medium has a large adhesive force to the print medium, it may not be separated from the print medium just by blowing air onto the print medium. In this regard, according to the liquid ejecting apparatus, since the charged printing medium is neutralized by the neutralizing member, paper powder having a polarity opposite to that of the printing medium is easily separated from the printing medium. The paper powder can be easily separated from the print medium by the air supply unit disposed on the downstream side of the charge removal member.

The gist of the liquid ejecting apparatus is provided in the casing, and includes a vibrating unit that vibrates the print medium conveyed in the casing.
According to this liquid ejecting apparatus, the attached paper dust can be easily separated from the printing medium by applying vibration to the printing medium conveyed in the housing. Therefore, the paper dust adhering to the print medium can be blown off more reliably.

The gist of the liquid ejecting apparatus is that the vibrating portion is a support that supports the print medium conveyed in the housing.
According to this liquid ejecting apparatus, the print medium can be vibrated by vibrating the support that supports the print medium conveyed in the housing.

The gist of the liquid ejecting apparatus is that the vibration unit vibrates the print medium by irradiating the print medium conveyed in the housing with ultrasonic waves.
According to this liquid ejecting apparatus, the print medium can be vibrated by irradiating the print medium with ultrasonic waves.

The figure which shows schematic structure of the conveyance system in the liquid ejecting apparatus of one Embodiment which actualized this invention. The perspective view which showed typically the inside of the housing | casing of the paper dust removal apparatus in the liquid ejecting apparatus. The figure which showed typically the effect | action of the paper dust removal apparatus in the liquid ejecting apparatus. The figure which showed typically schematic structure of the vibration part in a modification.

Hereinafter, a liquid ejecting apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a schematic configuration of a transport system in the liquid ejecting apparatus.
As shown in FIG. 1, an ink jet printer 10 (hereinafter simply referred to as a printer 10) includes a paper feed roller 11, a paper feed roller 12, and a paper discharge roller 13 that constitute a transport unit that transports a recording paper P. I have. In the following, the direction in which the recording paper P is transported is referred to as the transport direction X, and the direction from the back side to the near side in FIG. 1 is referred to as the width direction Y of the recording paper P.

  The paper feed roller 11 is composed of a pair of a paper feed drive roller 11a and a retard roller 14 disposed so as to face the paper feed drive roller 11a. The paper feed drive roller 11a is connected to a paper feed motor (not shown) and is driven by the paper feed motor. The retard roller 14 is driven to rotate in a state where a constant rotational load is applied by a torque limiting mechanism such as a torque limiter.

  The paper feed roller 12 includes a pair of a conveyance drive roller 12a and a conveyance driven roller 12b that is disposed so as to face the conveyance drive roller 12a and is driven to rotate. The paper discharge roller 13 includes a pair of a paper discharge drive roller 13a and a paper discharge driven roller 13b that is disposed so as to face the paper discharge drive roller 13a and is driven to rotate. The conveyance drive roller 12a and the paper discharge drive roller 13a are connected to a paper feed motor (not shown) which is the same drive source and are driven by the paper feed motor.

  The paper feed roller 11 and the paper feed roller 12 cooperate to transport the recording paper P in the transport direction X to feed and feed the recording paper P. In addition, the paper feed roller 12 and the paper discharge roller 13 cooperate to transport the recording paper P in the transport direction X to perform paper feed and paper discharge of the recording paper P.

  On the other hand, a paper detection sensor 15 that detects the leading end of the recording paper P in the transport direction X is provided between the paper feed roller 11 and the paper feed roller 12. In the following, the leading edge of the recording paper P refers to the leading edge in the transport direction X.

The paper detection sensor 15 includes, for example, a lever whose lower end is disposed in the conveyance path of the recording paper P and an optical sensor unit whose detection target is the upper end of the lever. The lever is biased so as to be in the original position by a spring, and is configured to rotate when the lower end is pushed by the recording paper P being conveyed. The lever is disposed at the original position in a state where there is no recording paper P that pushes the lower end of the lever. Further, the lower end is rotated by being pushed by the recording paper P being fed. Then, the presence or absence of the recording paper P is detected by detecting whether the position of the lever is the original position by the sensor unit. Further, the leading edge of the recording paper P is detected based on the timing at which the lever position rotates from the original position. The recording paper P that has passed through the paper detection sensor 15 is conveyed to the paper dust removing device 20.

  Next, the paper dust removing device 20 will be described with reference to FIGS. FIG. 2 is a perspective view schematically showing the inside of the housing of the paper dust removing device. FIG. 3 is a diagram schematically showing the operation of the paper dust removing device.

  The paper dust removing device 20 includes a support 21 that supports the recording paper P that is transported between the paper feed roller 11 and the paper feed roller 12, and a cover 22 that covers the support 21. It has a body 23. Then, the casing 23 is configured such that the support 21 and the lid 22 are close to the recording paper P, so that the upstream side (paper feed roller 11 side) and the downstream side (paper feed roller) in the transport direction X An internal space 24 isolated from the (12 side) is formed in the housing 23.

  The housing 23 is provided with a carry-in port 25 on the upstream side in the carrying direction X and a carry-out port 26 on the downstream side in the carrying direction X. The recording paper P is carried into the housing 23 from the carry-in port 25 and passes through the internal space 24, and then carried out from the carry-out port 26 to the outside of the housing 23.

  The recording paper P conveyed in the housing 23 is supported by the support 21. The support body 21 includes a support body 27 and support ribs 28 provided on the support body 27. The support ribs 28 are provided on the support body 27 so as to extend in the transport direction X, and a plurality of support ribs 28 are provided in parallel along the width direction Y of the recording paper P. The support 21 having such a configuration supports the recording paper P by the end surfaces of the support ribs 28.

  A vibration unit 29 that vibrates the support body 27 is connected to the support 21. The vibration unit 29 vibrates the recording paper P by vibrating the support body 27. The paper powder adhering to the recording paper P is subjected to a force based on the inertia caused by the vibration of the recording paper P. Then, by applying such force to the paper dust, the adhesion of the paper dust to the recording paper P is temporarily weakened, so that the paper dust is easily separated from the recording paper P.

  The paper dust removing device 20 includes a neutralizing brush 31 that is an example of a static eliminating member and an air blower 36 that is an example of an air supply unit in the internal space 24. The neutralization brush 31 neutralizes the recording paper P charged by friction with the paper feed roller 11 or the like. As shown in FIGS. 1 and 2, the static elimination brush 31 includes a main body member 32 and a brush member 33. The main body member 32 is made of a conductive material and is grounded. The brush member 33 is composed of a large number of conductive and flexible wires, and is bonded to the main body member 32 with a conductive double-sided tape (not shown). The neutralizing brush 31 is installed, for example, at a position where the tip of the brush member 33 and the end surface of the support rib 28 are in contact with each other so that the brush member 33 is in reliable contact with the recording paper P being conveyed. Further, as shown in FIG. 2, the static elimination brush 31 is arranged so that the brush member 33 contacts over the entire area of the recording paper P in the width direction Y. As shown in FIG. 3, in the recording paper P that has passed through the static elimination brush 31, the recording paper P and the paper dust 34 adhering to the recording paper P are neutralized over the entire area of the recording paper P. . By such charge removal by the charge removal brush 31, the paper powder 34 is easily separated from the recording paper P.

As shown in FIGS. 1 to 3, the air blower 36 is subsequently applied to the recording paper P that has been neutralized.
Air is blown by. The air blower 36 is disposed on the downstream side in the transport direction X with respect to the static elimination brush 31. As shown in FIG. 2, the air blower 36 is a recording sheet so that air flows from the downstream side in the transport direction X to the upstream side toward the blowing region 37 on the downstream side in the transport direction X with respect to the static elimination brush 31. Air is blown through the air supply port 38 from a direction inclined with respect to the printing surface Pa of P. That is, when the printing surface Pa of the recording paper P that has passed through the static elimination brush 31 reaches the spraying area 37, air is sprayed from obliquely above the printing surface Pa so as to flow from the air supply port 38 toward the static elimination brush 31. It is done.

  As shown in FIG. 3, the paper dust 34 adhering to the recording paper P is forcibly separated from the recording paper P by blowing air from the air blower 36, and then upstream of the conveyance direction X. Will move towards. As a result, the paper dust 34 adheres again to the portion of the recording paper P from which the paper dust 34 has been removed, that is, to the printing surface Pa located downstream of the spray region 37 in the transport direction X. Can be suppressed.

  Note that the higher the air flow rate on the printing surface Pa, the more easily the paper dust attached to the recording paper P is separated from the printing surface Pa. As the air supply unit that supplies air to the recording paper P, an air suction device that sucks air in the vicinity of the printing surface Pa and supplies other air toward the printing surface Pa can also be adopted. However, with such an air suction device, it is difficult to increase the air flow velocity on the printing surface Pa. In addition, if the flow velocity on the printing surface Pa is increased using an air suction device, the recording paper P itself is sucked and the recording paper P may be deformed. On the other hand, according to the present embodiment, since the air supply unit is configured by the air blower 36 that blows air against the recording paper P, not only the air flow rate on the printing surface Pa is easily increased, but also the recording. The deformation of the paper P can also be suppressed.

  Further, when the leading end of the recording paper P reaches the spraying area 37, there is a possibility that the recording paper P is curled because air enters between the recording paper P and the support 21. In this respect, the paper dust removing apparatus 20 of the present embodiment is provided with a regulating member 39 that faces the printing surface Pa at both ends in the width direction of the recording paper P in the spray region 37. By providing such a regulating member 39, even if the recording paper P is to be rolled by air, the behavior can be regulated by the regulating member 39. Thereby, curling of the recording paper P can be suppressed.

  As shown in FIG. 1, the cover 22 of the paper dust removing device 20 is provided with an exhaust device 43 as an exhaust unit. The exhaust device 43 is installed on the wall portion on the upstream side in the transport direction X and forcibly moves inside the housing 23 toward the side opposite to the printing region 50 described later through a filter 44 that captures paper dust. Exhaust. According to such a configuration, the paper dust 34 floating in the internal space 24 is captured by the filter 44 of the exhaust device 43. Moreover, since the air in the internal space 24 is forcibly exhausted toward the side opposite to the printing area 50, there is little influence on the airflow around the printing area 50, and there is little paper dust that has passed through the filter 44. It is also possible to suppress the flight of 34 toward the printing area 50.

  That is, in the paper dust removing device 20 having the above-described configuration, the charged recording paper P and the paper dust 34 attached to the recording paper P are neutralized by the static eliminating brush 31. The discharged recording paper P vibrates through the vibration of the support 21, so that the paper powder 34 is easily separated from the recording paper P. Then, air is blown against the paper dust 34 that is easily separated from the printing surface Pa, so that the paper dust 34 attached to the recording paper P is forcibly separated from the recording paper P. The recording paper P from which the paper dust has been removed by the paper dust removing device 20 is subsequently conveyed to the printing area 50 via the paper feed roller 12.

Next, the print area 50 where printing is performed on the recording paper P will be described.
As shown in FIG. 1, the print area 50 is an area between the paper feed roller 12 and the paper discharge roller 13. The printing area 50 is provided with a platen 51 that supports the recording paper P conveyed in the printing area 50 and a liquid ejecting head 56 that is disposed so as to face the platen 51.

  The platen 51 includes a platen main body 52 and platen ribs 53 a, 53 b, 53 c erected on the platen main body 52. The platen ribs 53a, 53b, and 53c are arranged in parallel in the transport direction X at a predetermined interval, and support the recording paper P transported on the platen 51.

  The liquid ejecting head 56 is mounted on a carriage 58 that is guided by a guide shaft 57 extending along the width direction Y of the recording paper P and reciprocates in the width direction Y. The carriage 58 moves along the width direction Y when a carriage motor (not shown) coupled to the guide shaft 57 is driven to rotate forward or backward. On the nozzle forming surface 56 a of the liquid ejecting head 56, a nozzle row composed of a plurality of nozzles N formed along the width direction Y is arranged in parallel in the transport direction X. The liquid ejecting head 56 converts the ink stored in the liquid ejecting head 56 into minute ink droplets toward the printing surface Pa of the recording paper P supported by the platen 51 while moving in the width direction Y. Spray. The ejected liquid droplets fly between the nozzle forming surface 56a and the printing surface Pa of the recording paper P and land on the printing surface Pa. That is, the printer 10 is a serial type printer in which the liquid ejecting head 56 moves, and the recording paper P is transported to the recording paper P by alternately repeating the transport of the recording paper P and the ejection of the liquid onto the recording paper P by the liquid ejecting head 56. Printing is performed on the printer.

  In the printer 10 having such a configuration, the recording paper P from which the paper dust has been removed by the paper dust removing device 20 is conveyed to the printing region 50. That is, the paper dust attached to the recording paper P is removed by the paper dust removing device 20 in advance, so that the paper dust is less likely to be generated from the recording paper P in the printing region 50. Therefore, adhesion of paper dust to the nozzle forming surface 56a can be suppressed. As a result, the paper dust itself adhering to the recording paper P is reduced, and printing defects due to the paper dust are less likely to occur. As a result, high-quality printing can be performed on the recording paper P.

As described above, according to the printer 10 of the present embodiment, the following effects can be obtained.
(1) In the housing 23 spatially separated from the printing area 50, a static elimination brush 31 for neutralizing the charged recording paper P and paper dust 34 adhering to the recording paper P; An air blower 36 for separating the paper powder 34 adhering to the recording paper P from the recording paper P is disposed. According to such a configuration, the paper dust 34 is easily separated from the recording paper P by the static eliminating brush 31, and the paper dust 34 that is forcibly separated from the recording paper P by the air blower 36 flies through the housing 23. become. Therefore, it is possible to suppress the paper powder separated from the recording paper P from flying toward the printing area 50.

  (2) Since the paper dust removing device 20 is located upstream of the printing area 50 in the conveyance path of the recording paper P, the paper dust attached to the recording paper P is printed along with the conveyance of the recording paper P. 50 can be suppressed. As a result, since printing is performed on the recording paper P in a state where no paper dust is attached, the quality of the printing result on the recording paper P can be improved.

(3) By the air blower 36 that blows air to the blowing area 37, the paper dust that has adhered to the recording paper P is forcibly separated from the recording paper P. According to such a configuration, the flow velocity of the air on the printing surface Pa can be increased as compared with the configuration in which the air in the vicinity of the printing surface Pa is sucked.

  (4) Air is blown from the direction inclined with respect to the printing surface Pa so that air flows from the downstream side in the transport direction X to the upstream side. According to such a configuration, the paper dust 34 separated from the printing surface Pa flies away from the printing area 50 in the transport direction X. Therefore, it is possible to suppress the paper dust separated from the recording paper P from adhering again to the portion where the paper dust 34 has already been removed, that is, the printing surface Pa downstream of the spraying region 37.

  (5) Restricting members 39 are provided at both ends in the width direction of the recording paper P in the spray region 37 so as to face the printing surface Pa. According to such a configuration, even if the recording paper P that receives air is about to be separated from the support rib 28, the behavior is restricted by the restriction member 39. Therefore, it is possible to suppress the conveyance failure of the recording paper P due to the separation of the recording paper P from the support ribs 28 and the air blowing.

  (6) The vibration unit 29 connected to the support 21 vibrates the recording paper P conveyed into the housing 23. According to such a configuration, the adhesion of the paper dust 34 to the recording paper P can be temporarily weakened, so that the paper dust 34 adhering to the recording paper P can be more reliably removed.

  (7) The exhaust device 43 that exhausts the inside of the housing 23 forcibly exhausts the air in the housing 23 toward the side opposite to the printing region 50 through the filter 44 that captures the paper powder 34. According to such a configuration, the paper powder 34 floating in the housing 23 can be captured by the filter 44. In addition, since air is exhausted toward the side opposite to the printing region 50, it is possible to suppress the minute paper powder 34 that has passed through the filter 44 from flying toward the printing region 50.

In addition, the said embodiment can be changed and implemented as follows.
In the above embodiment, the recording paper P is vibrated by the vibration unit 29 connected to the support 21. In addition to such a configuration, in order to vibrate the recording paper P conveyed in the housing 23, an ultrasonic irradiation unit that irradiates the recording paper P with ultrasonic waves is provided in the housing 23 separately, and the ultrasonic irradiation is performed. The configuration may be such that the recording paper P is vibrated by ultrasonic waves emitted from the unit. Such an ultrasonic irradiation unit can be realized by arranging, in addition to the air blower 36, an ultrasonic generation source for irradiating the recording paper P with ultrasonic waves in the housing 23. Further, for example, as shown in FIG. 4, an ultrasonic wave generation source 61 is provided in the air flow path in the air blower 36, and the ultrasonic wave generation source 61 is vibrated in accordance with the supply of air, thereby recording ultrasonic waves. The structure which irradiates the paper P may be sufficient.

  Since the natural frequency of the recording paper P and the natural frequency of the paper dust 34 are different from each other, in the recording paper P irradiated with ultrasonic waves, the frequency of the recording paper P and the paper dust is different from each other. Vibrate under. Therefore, the above-described configuration is superior in that the paper powder 34 is more easily separated from the recording paper P as compared with the case where the vibrating portion 29 is connected to the support 21.

  As long as the effect of removing paper dust by the air blower 36 is exhibited, the vibration unit 29 that vibrates the recording paper P and the static elimination brush 31 that neutralizes the recording paper P may be omitted as appropriate. Such a configuration is excellent in that the number of members of the paper dust removing device 20 can be reduced.

  The exhaust device 43 provided in the paper dust removing device 20 is provided with a filter 44 for capturing the paper dust 34, but may be configured without this. Even with such a configuration, as long as the air in the housing 23 is exhausted toward the side opposite to the printing region 50, it is possible to suppress the paper powder 34 included in the exhaust from reaching the printing region 50. is there.

  Further, the exhaust device 43 may be omitted. Even with such a configuration, the paper dust 34 separated from the recording paper P reaches the printing area 50 as long as air is supplied from the air blower 36 so that air flows from the downstream side to the upstream side in the transport direction X. It is possible to suppress this.

  In the embodiment, the air blower 36 is configured to blow air from a direction inclined with respect to the printing surface Pa so that air flows from the downstream side to the upstream side in the transport direction X. For example, the air may be supplied from the upper side to the lower side of the printing surface Pa, and the air blown to the printing surface Pa may be discharged toward the upper side of the housing 23. . That is, the direction of the air blown onto the recording paper P may be any as long as it prevents the paper dust 34 from reattaching to the printing surface Pa downstream of the blowing region 37 and the paper dust flying to the printing region 50 side.

  The air supply unit that supplies air to the recording paper P is not limited to the air blower 36 that blows air onto the recording paper P, and other air is supplied to the recording paper P by sucking air near the printing surface Pa of the recording paper P. An air suction device that supplies air may be used.

  The air blower 36 of the above embodiment may always blow air against the recording paper P, or is electrically connected to a control device that performs overall control of the printer 10 so that the recording paper P is placed in the housing 23. Air may be blown only during the transport period.

  In the above embodiment, the present invention is applied to a serial printer having the liquid ejecting head 56 movably. However, the present invention is not limited to this, and the present invention may be applied to a lateral type printer having the liquid ejecting head 56 that is movable. Further, the present invention may be applied to a line head type printer having a liquid ejecting head in which a position configured to eject ink droplets over the entire width direction Y of the recording paper P is fixed.

  In the spraying area 37 of the above-described embodiment, the regulating member 39 that faces the printing surface Pa at both ends in the width direction Y of the recording paper P is provided. In addition, a moving device that moves the regulating member 39 in accordance with the width of the recording paper P may be provided. With such a configuration, the recording paper P that receives air can be prevented from separating from the support ribs 28 regardless of the size of the recording paper P. It is possible to suppress the separation of the recording paper P from the support rib 28 by adjusting the air supply amount to the recording paper P, the air supply direction to the recording paper P, the conveyance speed of the recording paper P, and the like. . In such a configuration, the regulating member 39 can be omitted.

  The printer 10 may have a separate casing that surrounds the paper dust removing device 20, the platen 51, the liquid ejecting head 56, and the like. At this time, the exhaust device 43 of the paper dust removing device 20 is preferably configured to exhaust the air in the housing 23 to the outside of the housing of the printer 10.

N ... Nozzle, P ... Recording paper, X ... Transport direction, Y ... Width direction, Pa ... Printing surface, 10 ... Inkjet printer, 11 ... Paper feed roller, 11a ... Paper feed drive roller, 12 ... Paper feed roller, 12a ... Conveyance drive roller, 12b ... Conveyance driven roller, 13 ... Discharge roller, 13a ... Discharge drive roller, 13b ... Discharge driven roller, 14 ... retard roller, 1
DESCRIPTION OF SYMBOLS 5 ... Paper detection sensor, 20 ... Paper dust removal apparatus, 21 ... Support body, 22 ... Lid body, 23 ... Housing | casing, 24 ... Internal space, 25 ... Carry-in port, 26 ... Carry-out port, 27 ... Support main body, 28 ... Support rib, 29 ... vibrating portion, 31 ... static elimination brush, 32 ... main body member, 33 ... brush member, 34 ... paper dust, 36 ... air blower, 37 ... attachment area, 38 ... air supply port, 39 ... regulating member, 43 DESCRIPTION OF SYMBOLS ... Exhaust device, 44 ... Filter, 50 ... Printing area, 51 ... Platen, 52 ... Platen main body, 53a ... Platen rib, 53b ... Platen rib, 53c ... Platen rib, 56 ... Liquid ejecting head, 56a ... Nozzle formation surface, 57 ... Guide shaft 58 ... carriage, 61 ... ultrasonic wave generation source.

Claims (7)

A liquid ejecting apparatus that ejects liquid from the liquid ejecting head to a print medium conveyed to a printing area facing the liquid ejecting head,
A housing that forms a space isolated from the liquid ejecting head on the upstream side of the printing region in the transport path of the printing medium;
A liquid ejecting apparatus comprising: an air supply unit that is provided in the housing and supplies air toward the print medium conveyed in the housing. The liquid ejecting apparatus according to claim 1,
The air supply unit
A liquid ejecting apparatus, wherein air is supplied to a printing surface from a direction inclined with respect to a printing surface of the printing medium so that air flows from a downstream side to an upstream side in the conveyance direction of the printing medium. 3. The liquid ejecting apparatus according to claim 1, further comprising an exhaust unit that is provided in the housing and exhausts air from the housing on an upstream side of the housing in a conveyance direction of the print medium. . 4. The apparatus according to claim 1, further comprising: a neutralization member that is provided in the casing and neutralizes the print medium on an upstream side of the air supply unit in a conveyance direction of the print medium. Liquid ejector. 5. The liquid ejecting apparatus according to claim 1, further comprising: a vibration unit that is provided in the housing and vibrates the printing medium conveyed in the housing. 6. The liquid ejecting apparatus according to claim 5,
The liquid ejecting apparatus according to claim 1, wherein the vibration unit is a support that supports the print medium conveyed in the housing. The liquid ejecting apparatus according to claim 5,
The liquid ejecting apparatus, wherein the vibration unit vibrates the print medium by irradiating the print medium conveyed in the housing with ultrasonic waves.

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