JP2015199323A - Conveying device, and ink jet recording device having conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a defect of an image due to the adhesion of ink mist to a recording head.SOLUTION: A conveying device 310 is disposed to face a recording head 340. The conveying device 310 comprises a conveyor belt 320 and a suction part 330. The conveyor belt 320 conveys a recording medium P. The suction part 330 comprises a guide member 332, sucks the recording medium P through a plurality of holes 321, 335 formed in the guide member 332 and the conveyor belt 320 respectively, and adsorbs the recording medium P to the conveyor belt 320. The guide member 332 supports the recording medium P through the conveyor belt 320. A depth of a first hole 335a formed in a region 338 facing the recording head 340 in the guide member 332 is shallower than a depth of a second hole 335b formed in a region not facing the recording head 340 in the guide member 332.

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.

  For example, the ink jet recording apparatus has the following problems. That is, when a paper sheet to which paper dust adheres is carried to the position immediately below the inkjet head, the paper powder may be swept up by the air current generated in the image forming unit 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.

  For example, the ink jet recording apparatus described in Patent Document 1 includes a paper dust removing device in order to solve the above problem. The paper dust removing device includes a static elimination brush that neutralizes paper, an air blower that blows air on the static eliminated paper, and a casing that covers the static elimination brush and the air blower. The housing is disposed on the upstream side of the paper transport path from the inkjet head. The paper dust removing device blows air on the paper in the housing to remove the paper dust from the paper, and isolates the removed paper dust in the housing. As a result, the paper dust is prevented from adhering to the inkjet head.

JP 2011-183746 A

  In addition, the ink jet recording apparatus has the following problems, for example. That is, in the image forming unit, when the ink jet head ejects ink droplets, ink mist (hereinafter referred to as “ink mist”) is generated. The ink mist may float on the air current generated in the image forming unit and adhere to the inkjet head. If the ink mist adheres to the nozzles of the inkjet head or the vicinity thereof, the ink droplet ejection accuracy is lowered, and a defect may occur in the image formed on the paper.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a transport apparatus and an ink jet recording apparatus that can suppress image defects due to adhesion of ink mist to a recording head.

  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, sucks the recording medium through a plurality of holes formed in the guide member and the transport belt, and sucks the recording medium to the transport belt. The guide member supports the recording medium via the transport belt. The depth of the first hole formed in the region of the guide member facing the recording head is shallower than the depth of the second hole formed in the region of the guide member not facing the recording head.

  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 transport device includes a transport belt and a suction unit. The conveyance belt conveys a recording medium. The suction unit includes a guide member, sucks the recording medium through a plurality of holes formed in the guide member and the transport belt, and sucks the recording medium to the transport belt. The guide member supports the recording medium via the transport belt. The depth of the first hole formed in the region of the guide member facing the recording head is shallower than the depth of the second hole formed in the region of the guide member not facing the recording head.

  According to the present invention, it is possible to suppress an image defect due to adhesion of ink mist to a recording head.

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. FIG. 5 is an enlarged view of a part of FIG. FIG. 6 is a diagram illustrating a first configuration example of the first through hole and the second through hole. FIG. 7 is a diagram illustrating a second configuration example of the first through hole and the second through hole. FIG. 8 is a diagram illustrating a third configuration example of the first through hole and the second through hole. FIG. 9 is a diagram illustrating a fourth configuration example of the first through hole and the second through hole. FIG. 10 is a diagram illustrating a fifth configuration example of the first through hole and the second through hole.

  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 guide member 332 is formed with a plurality of grooves 334 and a plurality of holes 335. Hereinafter, the hole 335 formed in the guide member 332 is referred to as a “through hole”. The plurality of grooves 334 are formed on the support surface 333 of the guide member 332. 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 groove 334 and the through hole 335 formed in the guide member 332 will be described later with reference to FIGS.

  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 guide member 332, 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. FIG. 5 is an enlarged view of portion A in FIG. With reference to FIG.4 and FIG.5, the structure of the support surface 333 in the guide member 332 is demonstrated.

  In FIG. 4, rectangular regions 338 (338a, 338b, 338c, and 338d) indicated by broken lines 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.

  As shown in FIG. 4, a plurality of grooves 334 (334 a and 334 b) 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. Further, through holes 335 (335a and 335b) are formed on the bottom surfaces of the plurality of grooves 334, respectively. 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.

  The plurality of through holes 335 include a first through hole (first hole) 335a located in the head facing area and a second through hole (second hole) 335b located outside the head facing area. . The plurality of grooves 334 include a first groove 334a in which the first through hole 335a is formed and a second groove 334b in which the second through hole 335b is formed.

  In the present embodiment, the depth of the first through hole 335a is shallower than the depth of the second through hole 335b. Generally, when the depth of the through hole 335 is shallow, the loss of negative pressure received from the suction portion 330 is small, and the amount of air sucked in the through hole 335 per unit time (hereinafter referred to as “suction amount”) increases. On the contrary, when the depth of the through hole 335 is deep, the loss of the negative pressure received from the suction part 330 is large, and the suction amount is small in the through hole 335. In addition, the case where the magnitude | size of the through-hole 335, ie, the magnitude | size of the circle when planarly viewed, is assumed. Therefore, by making the depth of the first through hole 335a shallower than the depth of the second through hole 335b, the suction amount in the first through hole 335a is larger than the suction amount in the second through hole 335b. Become. As a result, a large air flow toward the air circulation chamber 331 is generated in the head facing region, and the ink mist floating in the vicinity of the inkjet head 340 is effectively sucked on the air flow. Thereby, the possibility that ink mist adheres to the inkjet head 340 is reduced.

  Hereinafter, the configuration of the first through hole 335a and the second through hole 335b will be described with reference to FIGS. FIG. 6 (FIGS. 6A and 6B) shows a first configuration example of the first through hole 335a and the second through hole 335b. FIG. 7 (FIGS. 7A and 7B) shows a second configuration example of the first through hole 335a and the second through hole 335b. FIG. 8 (FIGS. 8A and 8B) shows a third configuration example of the first through hole 335a and the second through hole 335b. When the first configuration example is employed, the BB cross-sectional view of FIG. 4 is FIG. 6A, and the CC cross-sectional view of FIG. 4 is FIG. 6B. When the second configuration example is adopted, the BB cross-sectional view of FIG. 4 is FIG. 7A, and the CC cross-sectional view of FIG. 4 is FIG. 7B. When the third configuration example is adopted, the BB cross-sectional view of FIG. 4 is FIG. 8A, and the CC cross-sectional view of FIG. 4 is FIG. 8B. 6 to 8, the conveyance belt 320 is not illustrated, but actually, the conveyance belt 320 is interposed between the inkjet head 340 and the guide member 332.

  As shown in FIG. 6, in the first configuration example, the depth t1 of the first groove 334a is substantially the same as the depth t2 of the second groove 334b. On the other hand, the thickness s1 of the portion of the guide member 332 where the first through hole 335a is formed (hereinafter referred to as “first portion”) is equal to the portion of the guide member 332 where the second through hole 335b is formed (hereinafter “ It is thinner than the thickness s2 of the “second portion”. Specifically, the convex portion 332a is formed in the second portion, and the thickness s1 of the first portion is made thinner than the thickness s2 of the second portion. The convex portion 332a is formed on the back surface of the guide member 332, for example. With this configuration, the depth u1 of the first through hole 335a is shallower than the depth u2 of the second through hole 335b. The diameter v1 of the first through hole 335a is substantially the same as the diameter v2 of the second through hole 335b. In addition, the convex part 332a may be formed in all or part of the part in which the 2nd groove | channel 334b in the guide member 332 is formed.

  As shown in FIG. 7, in the second configuration example, the depth t1 of the first groove 334a is substantially the same as the depth t2 of the second groove 334b. On the other hand, the thickness s1 of the first portion is thinner than the thickness s2 of the second portion. Specifically, the recess 332b is formed in the first portion, and the thickness s1 of the first portion is made thinner than the thickness s2 of the second portion. The recess 332b is formed on the back surface of the guide member 332, for example. With this configuration, the depth u1 of the first through hole 335a is shallower than the depth u2 of the second through hole 335b. The diameter v1 of the first through hole 335a is substantially the same as the diameter v2 of the second through hole 335b. In addition, the recessed part 332b may be formed in all or one part of the part in which the 1st groove | channel 334a in the guide member 332 is formed.

  Also, as shown in FIG. 8, in the third configuration example, the thickness s1 of the first portion is substantially the same as the thickness s2 of the second portion. On the other hand, the depth t1 of the first groove 334a is deeper than the depth t2 of the second groove 334b. With this configuration, the depth u1 of the first through hole 335a is shallower than the depth u2 of the second through hole 335b. That is, in the third configuration example, by making the depth t1 of the first groove 334a deeper than the depth t2 of the second groove 334b, the depth u1 of the first through hole 335a is set to the second penetration. The depth is smaller than the depth u2 of the hole 335b. The diameter v1 of the first through hole 335a is substantially the same as the diameter v2 of the second through hole 335b.

  According to the present embodiment, the first through hole 335a located in the head facing region and the second through hole 335b located outside the head facing region have the first through hole 335a having a second depth. It is formed to be shallower than the depth of the through hole 335b. With this configuration, the suction amount in the first through hole 335a can be made larger than the suction amount in the second through hole 335b. Accordingly, a large air flow toward the air circulation chamber 331 can be generated in the head facing region, and ink mist floating in the vicinity of the inkjet head 340 can be effectively sucked. Therefore, adhesion of ink mist to 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 is formed on the bottom surface of the groove 334, but is not limited thereto, and may be formed directly on the support surface 333. In this case, the through hole 335 is a hole penetrating from the front surface of the guide member 332 to the back surface of the guide member 332. In this case, the groove 334 is not necessarily formed in the support surface 333.

  When the through hole 335 is formed directly on the support surface 333, the first through hole 335a and the second through hole 335b are configured as shown in FIG. 9 or FIG. 10, for example. FIG. 9 (FIGS. 9A and 9B) shows a fourth configuration example of the first through hole 335a and the second through hole 335b. FIG. 10 (FIGS. 10A and 10B) shows a fifth configuration example of the first through hole 335a and the second through hole 335b.

  As shown in FIG. 9, in the fourth configuration example, the thickness s1 of the first portion is smaller than the thickness s2 of the second portion. Specifically, the convex portion 332a is formed in the second portion, and the thickness s1 of the first portion is made thinner than the thickness s2 of the second portion. Here, the through hole 335 is a hole that penetrates from the front surface of the guide member 332 to the back surface of the guide member 332, and the depth of the through hole 335 is equal to the thickness of the guide member 332. Therefore, with this configuration, the depth u1 of the first through hole 335a is shallower than the depth u2 of the second through hole 335b. The diameter v1 of the first through hole 335a is substantially the same as the diameter v2 of the second through hole 335b.

  Further, as shown in FIG. 10, in the fifth configuration example, the thickness s1 of the first portion is smaller than the thickness s2 of the second portion. Specifically, the recess 332b is formed in the first portion, and the thickness s1 of the first portion is made thinner than the thickness s2 of the second portion. Here, the through hole 335 is a hole that penetrates from the front surface of the guide member 332 to the back surface of the guide member 332, and the depth of the through hole 335 is equal to the thickness of the guide member 332. Therefore, with this configuration, the depth u1 of the first through hole 335a is shallower than the depth u2 of the second through hole 335b. The diameter v1 of the first through hole 335a is substantially the same as the diameter v2 of the second through hole 335b.

  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 device 320 Conveying belt 321 Suction hole 330 Suction part 332 Guide member 332a Convex part 332b Concave part 333 Support surface 334 Groove 334a First groove 334b Second groove 335 Through hole 335a First hole Through hole 335b Second through hole 338 Head facing region 340 Inkjet head

Claims (8)

A conveying device arranged to face the recording head,
A transport belt for transporting a recording medium;
A guide member that supports the recording medium via the conveyance belt; and the recording medium is sucked through a plurality of holes formed in each of the guide member and the conveyance belt; A suction part for adsorbing the
The depth of the first hole formed in the region of the guide member facing the recording head is shallower than the depth of the second hole formed in the region of the guide member not facing the recording head. apparatus. A plurality of grooves are formed on the support surface of the guide member that supports the recording medium,
2. The transport device according to claim 1, wherein the first hole and the second hole are holes formed in a bottom surface of the groove and penetrating from a bottom surface of the groove to a back surface of the guide member.   2. The transport device according to claim 1, wherein the first hole and the second hole are holes penetrating from a support surface supporting the recording medium in the guide member to a back surface of the guide member.   The transport apparatus according to claim 2 or 3, wherein a thickness of a portion of the guide member where the first hole is formed is thinner than a thickness of a portion of the guide member where the second hole is formed.   The conveying device according to claim 4, wherein a convex portion is formed at a portion of the guide member where the second hole is formed.   The conveyance device according to claim 4, wherein a recess is formed in a portion of the guide member where the first hole is formed. The thickness of the portion of the guide member where the first hole is formed is substantially the same as the thickness of the portion of the guide member where the second hole is formed;
The depth of the groove in which the first hole is formed among the plurality of grooves is deeper than the depth of the groove in which the second hole is formed in the plurality of grooves. Transport device. A transport apparatus according to any one of claims 1 to 7;
The recording head,
The recording head includes an inkjet head that ejects ink droplets.

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