JP2015168075A - Carrier device, and ink jet recorder with carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a recorded medium from floating under a recording head while suppressing paper powder from sticking on a nozzle with simple constitution.SOLUTION: A carrier device 310 is arranged opposite a recording head 340. The carrier device 310 includes a carrier belt 320 and a suction part 330. The carrier belt 320 carries a recorded medium P. The suction part 330 has a guide member 332 which supports the recorded medium P through a carrier belt 320. The suction part 330 sucks the recorded medium P through a plurality of first holes 335 formed in a guide member 332 and a plurality of second holes 321 formed in the carrier belt 320 so that the recorded medium P is sucked to the carrier belt 320. The first holes 335 are not formed in a first region 339a on the guide member 332. In the first region 339a, a partial region 337 associated with a feed member and a head facing region 338 facing a recording head 340 overlap with each other.

Description

  The present invention relates to a conveyance device and an inkjet recording apparatus including the conveyance device.

  An ink jet recording apparatus is known as a kind of recording apparatus. The ink jet recording apparatus includes an image forming unit that forms an image on a sheet as a recording medium. An image forming unit of an ink jet recording apparatus includes an ink jet head having nozzles that eject ink droplets, and a transport device that transports paper. The inkjet recording apparatus forms an image on a sheet by ejecting ink droplets onto the sheet conveyed by the conveyance device by the inkjet head.

  The conveyance device provided in the image forming unit includes, for example, a conveyance belt and a suction unit, and conveys the sheet by attracting the sheet to the conveyance belt. The conveying belt is driven to rotate and conveys the placed paper. The suction unit includes a guide member that supports the sheet via the conveyance belt. The suction unit sucks the sheet through a plurality of holes formed in each of the guide member and the conveyance belt, and adsorbs the sheet to the conveyance belt.

  For example, the ink jet recording apparatus has the following problems. In other words, when the paper dust adheres to the ink jet head, the paper dust is applied to the charged guide member by the air current generated in the image forming unit or when the paper dust is charged. It may rebound and rise and adhere to the nozzles of the inkjet head. If paper dust adheres to the nozzles, the nozzles may become clogged, making it impossible to eject ink droplets, which may cause defects in the image formed on the paper. Here, the airflow in the image forming unit is mainly generated when the suction unit sucks air from the holes of the guide member and the conveyance belt in order to suck the paper.

  For example, Patent Document 1 discloses an ink jet recording apparatus in which a suction hole is not formed in a region on a guide member directly below an ink jet head. According to this configuration, it is possible to weaken the airflow (hereinafter referred to as “suction air”) generated when the suction unit sucks air immediately below the ink jet head.

JP 2012-153048 A

  If the suction air directly under the inkjet head can be weakened, the adhesion of paper dust to the nozzle can be suppressed. On the other hand, if the suction wind becomes too weak, the suction force acting on the paper is insufficient and the paper may float. When the paper floats directly under the ink jet head, the distance between the ink jet head and the paper changes, so that the image is disturbed. In addition, a paper jam (jam) may occur immediately below the inkjet head.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a conveyance device capable of suppressing the floating of a recording medium under a recording head while suppressing adhesion of paper dust to a nozzle with a simple configuration. And an inkjet recording apparatus.

  The conveying device according to one aspect of the present invention is disposed to face the recording head. The transport device includes a transport belt and a suction unit. The conveyance belt conveys a recording medium. The suction unit includes a guide member that supports the recording medium via the transport belt. The suction section sucks the recording medium through a plurality of first holes formed in the guide member and a plurality of second holes formed in the transport belt, and the recording medium is Adsorb to the conveyor belt. The first hole is not formed in the first region on the guide member. The first region is a region where a partial region related to the feeding member in the guide member overlaps with a head facing region facing the recording head in the guide member. The feeding member is a member that is provided on a path for transporting the recording medium to the transport device, and that feeds the recording medium from the upstream side to the downstream side of the path.

  An ink jet recording apparatus according to another aspect of the present invention includes a transport device and a recording head. The recording head includes an inkjet head that ejects ink droplets. The conveying device is disposed to face the recording head. The transport device includes a transport belt and a suction unit. The conveyance belt conveys a recording medium. The suction unit includes a guide member that supports the recording medium via the transport belt. The suction section sucks the recording medium through a plurality of first holes formed in the guide member and a plurality of second holes formed in the transport belt, and the recording medium is Adsorb to the conveyor belt. The first hole is not formed in the first region on the guide member. The first region is a region where a partial region related to the feeding member in the guide member overlaps with a head facing region facing the recording head in the guide member. The feeding member is a member that is provided on a path for transporting the recording medium to the transport device, and that feeds the recording medium from the upstream side to the downstream side of the path.

  According to the present invention, it is possible to suppress the floating of the recording medium under the recording head while suppressing the adhesion of paper dust to the nozzle with a simple configuration.

FIG. 1 is a configuration diagram of an example of an ink jet recording apparatus including a transport device according to an embodiment. FIG. 2 is a first perspective view of the transport apparatus according to the embodiment. FIG. 3 is a second perspective view of the transport apparatus according to the embodiment. FIG. 4 is a plan view of the guide member according to the embodiment. 5 is a cross-sectional view taken along the line AA in FIG. 6 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a plan view of a guide member according to a first modification of the embodiment. FIG. 8 is a plan view of a guide member according to a second modification of the embodiment. FIG. 9 is a plan view of a guide member according to a third modification of the embodiment.

  Embodiments of the present invention will be described with reference to the drawings. The embodiments described below do not limit the invention according to the claims. In addition, all of the constituent elements described in the embodiments are not necessarily essential to the solving means of the invention. The same reference numerals denote the same components throughout the drawings.

  FIG. 1 is a configuration diagram of an example of an ink jet recording apparatus including a transport device according to an embodiment.

  The ink jet recording apparatus 1 includes an apparatus casing 100, a paper feed unit 200, an image forming unit 300, a paper transport unit 400, and a paper discharge unit 500. In the present embodiment, the paper feed unit 200 is disposed below the inside of the apparatus housing 100. The image forming unit 300 is disposed above the paper feeding unit 200. The paper transport unit 400 is disposed on one side of the image forming unit 300. The paper discharge unit 500 is disposed on the other side of the image forming unit 300.

  The paper feed unit 200 includes a paper feed cassette 201 detachably attached to the apparatus housing 100, a paper feed roller 202, and a guide plate 203. The paper feed roller 202 is disposed above one end side of the paper feed cassette 201. The guide plate 203 is disposed between the paper feed roller 202 and the paper transport unit 400.

  A plurality of sheets P are stored in a stacked state in the sheet feeding cassette 201. The paper feed roller 202 takes out the paper P in the paper feed cassette 201 one by one. The guide plate 203 guides the paper P taken out by the paper feed roller 202 to the paper transport unit 400.

  The paper transport unit 400 includes a paper transport path 401, a first transport roller pair 402, a second transport roller pair 403, and a registration roller pair 404. The paper transport path 401 constitutes a part of the paper P transport path. The first transport roller pair 402 is provided on the entrance side of the paper transport path 401. The second transport roller pair 403 is provided in the middle of the paper transport path 401. The registration roller pair 404 is provided on the exit side of the sheet conveyance path 401.

  The first transport roller pair 402 feeds the paper P sent from the paper feed unit 200 to the paper transport path 401. The second transport roller pair 403 transports the paper P sent out by the first transport roller pair 402 to the downstream side of the paper transport path 401. The registration roller pair 404 performs skew correction of the paper P that has been conveyed by the second conveyance roller pair 403. The registration roller pair 404 causes the paper P to temporarily stand by in order to synchronize the timing of image formation and conveyance with respect to the paper P. Then, the registration roller pair 404 sends the paper P to the image forming unit 300 in synchronization with the image formation timing.

  The image forming unit 300 forms an image on the paper P. The image forming unit 300 employs an inkjet recording method as an image forming method. The image forming unit 300 includes a conveyance device 310, a plurality of types of inkjet heads (an example of a recording head) 340, and a conveyance guide 350. In the present embodiment, the plurality of types of inkjet heads 340 are arranged above the transport device 310 and are arranged in parallel from the upstream side to the downstream side of the transport path of the paper P. The transport device 310 is disposed to face a plurality of types of inkjet heads 340. Specifically, the nozzle surfaces 341 of the plurality of types of ink jet heads 340 and the support surface 333 of the transport device 310 are arranged to face each other with the transport belt 320 interposed therebetween. The conveyance guide 350 is disposed on the downstream side of the conveyance path of the paper P with respect to the conveyance device 310. Note that the arrangement of the inkjet head 340 and the conveyance device 310 is not limited to the arrangement shown in FIG. That is, the nozzle surface 341 of the ink jet head 340 and the support surface 333 of the transport device 310 may be disposed to face each other with the transport belt 320 interposed therebetween. For example, the ink jet head 340 and the transport device 310 are disposed side by side. May be.

  In this embodiment, the image forming unit 300 includes four types of inkjet heads 340, that is, a black (Bk) inkjet head 340a, a cyan (C) inkjet head 340b, and a magenta (M) inkjet head. 340c and an inkjet head 340d for yellow (Y). Each of the four types of inkjet heads 340a, 340b, 340c, and 340d has a plurality of nozzles that eject ink droplets. The surface on the inkjet head 340 where the nozzles are arranged is a nozzle surface 341. The nozzles of the black inkjet head 340a eject black ink droplets. The nozzles of the cyan inkjet head 340b eject cyan ink droplets. The nozzles of the magenta inkjet head 340c eject magenta ink droplets. The nozzles of the yellow inkjet head 340d eject yellow ink droplets. The nozzles of the inkjet head 340 eject ink droplets onto the paper P that has been transported to a position facing the nozzle surface 341, so that an image such as a character or a figure is formed on the paper P. In FIG. 1, each of the four types of inkjet heads 340 a, 340 b, 340 c, and 340 d is shown one by one for the sake of space, but in this embodiment, the image forming unit 300 is configured for each type. A plurality of inkjet heads 340 are provided.

  The paper P transported by the paper transport unit 400 is guided onto the transport belt 320 by the suction roller 312 and placed on the transport belt 320. Preferably, the paper P is placed on the conveyor belt 320 such that the center in the width direction coincides with the center in the width direction of the conveyor belt 320. Here, the width direction of the paper P is a direction orthogonal to the paper transport direction D1 on the recording surface of the paper P. The width direction of the transport belt 320 is a direction orthogonal to the paper transport direction D1 on the surface of the transport belt 320 on which the paper P is placed. The paper P placed on the transport belt 320 is attracted to the transport belt 320 and transported in the paper transport direction D1. The conveyance belt 320 sequentially conveys the paper P to positions facing the nozzle surfaces 341 of the four types of inkjet heads 340a, 340b, 340c, and 340d. Each of the four types of inkjet heads 340a, 340b, 340c, and 340d ejects ink droplets onto the paper P that has been transported to a position facing the nozzle surface 341. As a result, an image is formed on the paper P. The conveyance belt 320 conveys the paper P on which an image is formed to the conveyance guide 350. The transport guide 350 guides the paper P transported by the transport device 310 to the paper discharge unit 500.

  The paper discharge unit 500 includes a discharge roller pair 501, a discharge tray 502, and a discharge port 503. The discharge tray 502 is fixed to the device casing 100 so as to protrude from the discharge port 503 to the outside of the device casing 100. The paper P that has passed through the conveyance guide 350 is sent out in the direction of the discharge port 503 by the discharge roller pair 501 and discharged to the discharge tray 502.

  FIG. 2 is a first perspective view of the transport apparatus according to the embodiment. FIG. 3 is a second perspective view of the transport apparatus according to the embodiment. FIG. 3 shows the conveying device 310 with the conveying belt 320 removed. The conveyance device 310 will be described with reference to FIGS.

  The transport device 310 places the paper P transported by the paper transport unit 400 on the transport belt 320, transports the paper P to a position facing the inkjet head 340, and then transports the paper P to the paper discharge unit 500. The transport device 310 according to the present embodiment transports the paper P by adsorbing the paper P to the transport belt 320. The conveyance device 310 includes a tension roller 311, an adsorption roller 312, a drive roller 313, a plurality of (two in this embodiment) guide rollers 314, a speed detection roller 315, an endless conveyance belt 320, and suction. Part 330.

  The conveyor belt 320 is stretched between a tension roller 311, a driving roller 313, a plurality of guide rollers 314, and a speed detection roller 315 arranged at a predetermined interval. In the present embodiment, the tension roller 311 and the speed detection roller 315 are disposed on the side close to the paper transport unit 400, and the drive roller 313 is disposed on the side close to the paper discharge unit 500. The transport belt 320 is rotated in a direction in which the loaded paper P is transported in the paper transport direction D1 when the driving roller 313 is driven to rotate. Here, the paper transport direction D1 is a transport direction of the paper P in the image forming unit 300, and is a direction from the paper transport unit 400 side to the paper discharge unit 500 side. The suction roller 312 is disposed on the upstream side in the paper transport direction D1.

  As shown in FIG. 2, a plurality of holes 321 are formed on the surface of the conveyor belt 320, that is, the surface on which the paper P is placed. Hereinafter, the holes 321 formed in the conveyance belt 320 are referred to as “suction holes”. The suction hole 321 penetrates the transport belt 320 in the thickness direction. The number and arrangement of the suction holes 321 shown in FIG. 2 are merely examples, and the number and arrangement may be different from those in FIG.

  The suction unit 330 is disposed on the back side of the conveyor belt 320. The suction unit 330 sucks the paper P through the suction holes 321 of the transport belt 320 and sucks the paper P onto the surface of the transport belt 320. The suction unit 330 includes an air circulation chamber 331, a guide member 332, and a suction device 336.

  The air circulation chamber 331 is formed by, for example, a box-shaped member whose upper surface is open. The opening on the upper surface of the air circulation chamber 331 is covered with a guide member 332. The guide member 332 has a support surface 333 that supports the paper P via the transport belt 320. In the present embodiment, the guide member 332 is a plate-like member whose surface is the support surface 333. As shown in FIG. 3, the support surface 333 is formed with a plurality of grooves 334 and a plurality of holes 335. Hereinafter, the holes 335 formed in the support surface 333 are referred to as “through holes”. In the present embodiment, the through hole 335 is formed in the bottom surface of the groove 334 and penetrates the guide member 332 in the thickness direction from the bottom surface of the groove 334 to the back surface of the guide member 332. The number and arrangement of the grooves 334 and the through holes 335 shown in FIG. 3 are merely examples, and the number and arrangement may be different from those shown in FIG. Details of the arrangement of the grooves 334 and the through holes 335 will be described later with reference to FIGS. 4 and 7 to 9.

  The suction device 336 is a fan, for example. The suction device 336 is disposed below the air circulation chamber 331, for example. An exhaust port is formed in the bottom wall of the air circulation chamber 331 at a position where the suction device 336 is disposed. By driving the suction device 336, the air in the air circulation chamber 331 is discharged out of the air circulation chamber 331 through the exhaust port and the suction device 336. As a result, a negative pressure is generated in the air circulation chamber 331. With this negative pressure, the paper P is sucked through the suction holes 321 of the transport belt 320 and the through holes 335 of the support surface 333, and the paper P is attracted to the transport belt 320. Accordingly, the transport device 310 can transport the paper P while adsorbing the paper P to the transport belt 320. The suction device 336 is not limited to a fan, and may be another device that can generate a negative pressure, such as a vacuum pump.

  FIG. 4 is a plan view of the guide member according to the embodiment. 5 is a cross-sectional view taken along the line AA in FIG. 6 is a cross-sectional view taken along the line BB in FIG. With reference to FIGS. 4-6, the structure of the groove | channel 334 and the through-hole 335 which are formed in the support surface 333 and the support surface 333 is demonstrated.

  In FIG. 4, rectangular regions 338 (338a, 338b, 338c, and 338d) are regions facing the nozzle surface 341 of the inkjet head 340 on the support surface 333 (hereinafter referred to as “head facing region”). A conveyance belt 320 is interposed between the inkjet head 340 and the support surface 333. Therefore, the head facing region 338 is more precisely a region on the support surface 333 that faces the nozzle surface 341 of the inkjet head 340 via the transport belt 320. The head facing region 338a is a region facing the nozzle surface 341 of the black inkjet head 340a. The head facing region 338b is a region facing the nozzle surface 341 of the cyan inkjet head 340b. The head facing region 338c is a region facing the nozzle surface 341 of the magenta inkjet head 340c. The head facing region 338d is a region facing the nozzle surface 341 of the yellow inkjet head 340d.

  The ink jet recording apparatus 1 according to this embodiment is a line head type ink jet recording apparatus. That is, the image forming unit 300 includes a plurality of (three in the present embodiment) each of the four types of inkjet heads 340a, 340b, 340c, and 340d. And the some inkjet head 340 is arrange | positioned as follows about each kind. That is, three black inkjet heads 340 a are arranged in a staggered manner along the width direction of the support surface 333. Here, the width direction of the support surface 333 is a direction orthogonal to the paper transport direction D1 on the support surface 333. Similarly, three cyan inkjet heads 340 b are arranged in a staggered manner along the width direction of the support surface 333. Similarly, three magenta inkjet heads 340 c are arranged in a staggered manner along the width direction of the support surface 333. Similarly, the three yellow inkjet heads 340 d are arranged in a staggered manner along the width direction of the support surface 333.

  In FIG. 4, a rectangular area 337 is an area (hereinafter referred to as “partial area”) related to a feed member described later on the support surface 333. Specifically, the partial region 337 is a region on the support surface 333 corresponding to the belt partial region on the conveyance belt 320. Here, the belt partial region is a region where a portion (hereinafter referred to as “contact portion”) of the conveyance belt 320 that contacts the feeding member of the paper P is placed.

  The feeding member is a member that is provided on the upstream side of the transport device 310 in the transport path of the paper P, and that contacts the part of the paper P and feeds the paper P from the upstream side to the downstream side of the transport path. When feeding the paper P to the downstream side, the feeding member applies a force for feeding the paper P downstream to the contact portion of the paper P. By this force, the feeding member and the contact portion of the paper P rub against each other to generate paper dust. Accordingly, the paper dust is particularly likely to be generated at the contact portion of the paper P, and easily adheres to the contact portion of the paper P. Therefore, the amount of paper dust carried increases in the belt partial area where the contact part is placed and the partial area 337 corresponding to the belt partial area. Since the feeding member applies a force to a part (contact portion) of the paper P to feed the paper P, the feeding member contacts the entire surface of the paper P and feeds the paper P, for example, paper dust compared to the pair of registration rollers 404. It is easy to generate.

  In the present embodiment, the feeding members are the paper feed roller 202, the first transport roller pair 402, and the second transport roller pair 403. When there are a plurality of feed members, the partial region 337 may be a region related to all of the plurality of feed members, or may be a region related to some of the feed members. . In the present embodiment, the partial area 337 is an area related to the paper feed roller 202. That is, the partial region 337 according to the present embodiment is a region on the support surface 333 corresponding to a region on which a portion of the conveyance belt 320 that contacts the paper feed roller 202 of the paper P is placed. This is due to the following reason. That is, the paper feed roller 202 applies a particularly large frictional force to the paper P in order to take out the paper P from the paper feed cassette 201. Further, when the paper feeding roller 202 applies a frictional force to the paper P, the paper P may rub against each other in the paper feeding cassette 201. These are factors that increase the amount of paper dust generated. Therefore, the amount of paper dust generated is particularly large at the location where the paper feed roller 202 and the paper P rub against each other.

  As shown in FIG. 4, a plurality of grooves 334 are formed in almost the entire area of the support surface 333. The groove 334 has, for example, an oval shape extending in the paper transport direction D1 in plan view. The length in the longitudinal direction of the groove 334, that is, the length in the paper transport direction D1, may be different among the plurality of grooves 334. The length of the groove 334 in the short direction, that is, the length of the support surface 333 in the width direction is, for example, substantially the same among the plurality of grooves 334. For example, the groove 334 is formed so as to be opposed to at least two suction holes 321 of the transport belt 320. As the conveyance belt 320 advances, the suction holes 321 facing each of the plurality of grooves 334 are replaced one by one.

  As shown in FIGS. 4 and 5, one or more through holes 335 are formed on the bottom surfaces of the plurality of grooves 334. In FIG. 4, the through hole 335 is indicated by a hatched circle. The through hole 335 has, for example, a circular shape in plan view. The through hole 335 penetrates the guide member 332 in the thickness direction from the bottom surface of the groove 334 to the back surface of the guide member 332. In the example of FIG. 4, at least one through hole 335 is formed in all the grooves 334, but the through holes 335 are not necessarily formed in all the grooves 334. In other words, the support surface 333 may be formed with a groove 334 in which the through hole 335 is not formed.

  As shown in FIG. 4, in the present embodiment, a through hole 335 is not formed in a region 339 a where the partial region 337 and the head facing region 338 overlap (hereinafter referred to as “first region”) 339 a. With this configuration, the suction air generated above the first region 339a where the paper dust in the head facing region 338 is particularly high is weakened. Therefore, the rising of the paper powder is suppressed above the first region 339a where the paper powder is particularly high, and the adhesion of the paper powder to the nozzle is suppressed. Therefore, nozzle clogging due to adhesion of paper dust is effectively suppressed.

  On the other hand, a through-hole 335 is formed in a region (hereinafter referred to as “third region”) 339 c that does not overlap with the partial region 337 in the head facing region 338. With this configuration, a stronger suction air is generated above the third region 339c of the head facing region 338 where the amount of paper dust is not so large than above the first region 339a. Therefore, in the third region 339c, the suction force acting on the paper P is prevented from being insufficient, and the floating of the paper P is suppressed. In the present embodiment, the first region 339a is a region sandwiched between two third regions 339c and is smaller than the third region 339c. Accordingly, the floating of the paper P in the first region 339a can be suppressed by suppressing the floating of the paper P in the third region 339c. Therefore, the occurrence of image disturbance due to the change in the distance between the inkjet head 340 and the paper P is suppressed. In addition, the occurrence of a paper jam just below the inkjet head 340 is suppressed. In addition, since the possibility that the paper dust adheres to the nozzle is not high above the third region 339b where the paper dust is not so much, the necessity of weakening the suction air is not so high.

  In the present embodiment, the through hole 335 of the third region 339c is formed in the vicinity of the outer edge of the third region 339c, specifically at a position in contact with the outer edge. With this configuration, the suction air generated above the third region 339c, particularly above the inside of the third region 339c, is weaker than when the through hole 335 is formed near the center of the third region 339c. Become. Accordingly, in the third region 339c, in addition to the floating of the paper P, the adhesion of the paper powder to the nozzle above the paper P is also suppressed.

  In the present embodiment, the through hole 335 is located as far away from the first region 339a as possible in a region (hereinafter referred to as “second region”) 339b of the partial region 337 that does not overlap with the head facing region 338. Formed. Specifically, as shown in FIG. 6, the through hole 335 of the second region 339b (hereinafter referred to as “second through hole”) is provided in each of the two first regions 339a sandwiching the second region 339b. To the same distance L. With this configuration, it is possible to prevent suction air generated above the first region 339a from being strengthened by suction of air from the second through hole. In addition, the second region 339b is a region with a particularly large amount of paper dust, like the first region 339a. Therefore, the paper dust is likely to rise by suction of air from the second through hole. Therefore, by adopting the above configuration, the paper dust that has risen due to the suction of air from the second through-hole moves to the first region 339a and adheres to the nozzles above the first region 339a. However, it is prevented as much as possible. Although the conveyance belt 320 is not shown in FIG. 6, the conveyance belt 320 is actually interposed between the inkjet head 340 and the guide member 332.

  In the present embodiment, the partial region 337 may have conductivity. That is, the part which comprises the partial area | region 337 in the guide member 332 may be formed with the member which has electroconductivity. With this configuration, charging due to friction between the support surface 333 and the conveyor belt 320 is prevented in the partial region 337. Therefore, even when the paper dust is charged, the charged paper dust is prevented from repelling and flying up to the charged support surface 333 and adhering to the nozzles in the partial region 337 where the paper dust is particularly high.

  FIG. 7 is a plan view of a guide member according to a first modification of the embodiment.

  As shown in FIG. 7, in the first modification, the groove 334 is not formed in the first region 339 a in addition to the through hole 335. With this configuration, the suction air generated above the first region 339a is further weakened compared to the case where the first groove is formed in the first region 339a. Here, the first groove is a groove 334 extending from the first region 339a to the second region 339b, and a through-hole 335 is formed in the bottom surface in the second region 339b. . Therefore, the paper powder rising above the first region 339a and the paper powder adhering to the nozzle are more effectively suppressed.

  FIG. 8 is a plan view of a guide member according to a second modification of the embodiment.

  As shown in FIG. 8, in the second modification, the groove 334 and the through hole 335 are not formed in the partial region 337. With this configuration, the suction air generated above the region 337 is weakened in the entire partial region 337 with a particularly large amount of paper dust being conveyed. Therefore, in the entire partial region 337, the upward movement of paper dust is suppressed. As a result, the adhesion of paper dust to the nozzle is more effectively suppressed.

  FIG. 9 is a plan view of a guide member according to a third modification of the embodiment.

  As shown in FIG. 9, in the third modification, a groove 334 in which the through hole 335 is not formed is formed in the partial region 337. With this configuration, the suction air generated above the region 337 is not formed in the second modified example, that is, the groove 334 and the through-hole 335, in the entire partial region 337 having a particularly large amount of paper powder to be conveyed. It is further weakened compared to the case. Therefore, in the entire partial region 337, the upward movement of paper dust is suppressed. As a result, the adhesion of paper dust to the nozzle is more effectively suppressed. Further, since the contact area between the conveyance belt 320 and the guide member 332 is reduced, the frictional resistance between the conveyance belt 320 and the guide member 332 is reduced. As a result, the load applied to the drive motor that drives the conveyor belt 320 is reduced.

  According to the present embodiment, the through hole 335 is not formed in the first region 339a. In addition, in the second region 339b, the through hole 335 may be formed at a position as far as possible from the first region 339a. Further, the groove 334 and the through hole 335 may not be formed in the first region 339a. In the partial region 337, a groove 334 in which the through hole 335 is not formed may be formed. Further, the groove 334 and the through hole 335 may not be formed in the partial region 337. Further, the partial region 337 may have conductivity. By each of these features or a combination of any one or more of these features, the suction air generated above the first region 339a with a particularly high amount of paper dust in the head facing region 338 is weakened. Therefore, the rising of the paper powder is suppressed above the first region 339a where the paper powder is particularly high, and the adhesion of the paper powder to the nozzle is suppressed. Therefore, nozzle clogging due to adhesion of paper dust is effectively suppressed.

  In addition, a through hole 335 may be formed in the third region 339c. Thereby, the shortage of the suction force acting on the paper P is prevented above the third region 339c, and the floating of the paper P is suppressed. In addition, since the floating of the paper P in the third region 339c is suppressed, the floating of the paper P in the first region 339a adjacent to the third region 339c can also be suppressed. Therefore, the occurrence of image disturbance due to the change in the distance between the inkjet head 340 and the paper P is suppressed. In addition, the occurrence of a paper jam just below the inkjet head 340 is suppressed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the present invention. In addition, the drawings schematically show each component mainly for easy understanding, and the thickness, length, number, etc. of each component shown in the drawings are actually not for the convenience of drawing. Different. In addition, the material, shape, dimensions, and the like of each component shown in the embodiment are examples and are not limited to these.

  For example, in the present embodiment, the through hole 335 has a circular shape in plan view, but is not limited thereto, and may have a rectangular shape in plan view, for example. In the present embodiment, the groove 334 has an oval shape in plan view, but is not limited thereto, and may have a rectangular shape in plan view, for example.

  In the present embodiment, the ink jet recording apparatus 1 is a line head type ink jet recording apparatus, but is not limited thereto, and may be a serial type ink jet recording apparatus.

  In the present embodiment, a plurality of ink jet heads 340 are arranged in a staggered pattern along the width direction of the support surface 333 for each type, but the present invention is not limited to this. For example, a plurality of ink jet heads 340 for each type may be arranged in a line along the width direction of the support surface 333. For example, the inkjet head 340 may be provided alone for each type.

  In the present embodiment, the inkjet recording apparatus 1 is an inkjet recording apparatus capable of forming a full-color image, but is not limited thereto, and may be an inkjet recording apparatus that forms a monochrome image. That is, the image forming unit 300 may include only the black inkjet head 340a.

  In the present embodiment, the recording medium is paper, but is not limited thereto, and may be a resin sheet or a fabric, for example.

  In the present embodiment, the inkjet recording apparatus 1 including the transport apparatus 310 has been described. However, the transport apparatus 310 may be mounted on another recording apparatus, for example, an electrophotographic image forming apparatus.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 300 Image forming part 310 Conveying apparatus 320 Conveying belt 321 Suction hole 330 Suction part 332 Guide member 333 Support surface 334 Groove 335 Through hole 337 Partial area 338 Head facing area 339a First area 339b Second area 339c Second area 339c 3 area 340 inkjet head

Claims (11)

A conveying device arranged to face the recording head,
A transport belt for transporting a recording medium;
A guide member configured to support the recording medium via the transport belt; and a plurality of first holes formed in the guide member and a plurality of second holes formed in the transport belt. A suction unit that sucks the recording medium and sucks the recording medium to the transport belt;
In the first region on the guide member, the first hole is not formed,
The first region is a region where a partial region related to the feeding member in the guide member overlaps a head facing region facing the recording head in the guide member,
The transporting device is a transporting device that is provided on a path for transporting the recording medium to the transporting apparatus, and that feeds the recording medium from the upstream side to the downstream side of the path. The partial area is an area on the guide member corresponding to a belt partial area on the transport belt,
2. The transport device according to claim 1, wherein the belt partial region is a region on which a portion of the transport belt that contacts the feeding member of the recording medium is placed. A plurality of grooves are formed in the guide member,
The transport apparatus according to claim 1, wherein the first hole is formed on a bottom surface of the groove.   The transport apparatus according to claim 3, wherein the groove is not formed in the first region. There are a plurality of the first regions,
In the second region on the guide member, the first hole has the same distance to each of the two first regions sandwiching the second region of the plurality of first regions. Formed into
The transport apparatus according to claim 1, wherein the second area is an area that does not overlap the head facing area in the partial area.   The conveying device according to claim 3, wherein the groove is not formed in the partial region.   The conveying apparatus according to claim 3, wherein the first hole is not formed on a bottom surface of the groove formed in the partial region of the plurality of grooves. In the third region on the guide member, the first hole is formed,
The transport apparatus according to claim 1, wherein the third area is an area that does not overlap the partial area in the head facing area.   The transport apparatus according to claim 8, wherein in the third region, the first hole is formed at a position close to an outer edge of the third region.   The conveyance device according to claim 1, wherein the partial region has conductivity. A transport apparatus according to any one of claims 1 to 10,
The recording head,
The recording head includes an inkjet head that ejects ink droplets.

Images