JP2016132540A - Recording medium-conveying device, and image recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording medium-conveying device and an image recorder stabilizing the sucking retention of a recording medium while alleviating deformation of the recording medium.SOLUTION: A recording medium-conveying device comprises: a protrusion arrangement part having plural first adsorption holes adsorbing the recording media and plural protrusions protruding with a first height from a retention face; and a land part comprising a guide part, an adsorption part and a rear end placing part. The guide part is a base part protruding with the first height from the retention face and has plural second adsorption holes adsorbing the recording media. The adsorption part has the third adsorption holes to adsorb the recording media with the adsorption power stronger than that in the guide part. The rear end placing part is the base part protruding with the first height from the retention face. The distance from the top position of the recording media to the downstream side end of the rear end placing part is shorter than the minimum by dimensional tolerance of the length of the recording media in a conveyance direction, and the distance from the above top position to the upstream side end of the rear end placing part is longer than the maximum by the above dimensional tolerance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a recording medium conveying apparatus and an image recording apparatus, and more particularly to a technique for attracting and conveying a recording medium on a holding surface.

  When the paper used for printing is placed in a high humidity environment, it is deformed including moisture. Also, the printed paper is deformed by extending the portion where the ink is attached. Such deformation of the paper is called curl or cockle.

  When the deformed sheet is conveyed while being held on a drum or belt and printed by the ink jet method, there is a problem that the slow distance (the flying distance of ink droplets) changes and the quality of the printed image is deteriorated. In addition, there is a problem that the sheet comes into contact with the print head and causes a failure.

  In order to solve such a problem, Patent Document 1 discloses that a recording medium is absorbed and held on a holding surface of a drum or belt provided with a convex portion, thereby efficiently absorbing cockle over the entire area of the recording medium. A technique for bringing the entire surface into close contact with the holding surface is disclosed.

Japanese Patent No. 5543564

  However, when the recording medium is sucked and held on the holding surface on which the convex portions are formed, there is a problem that the trailing edge of the recording medium may float.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording medium conveyance device and an image recording apparatus that stabilize the suction and holding of the recording medium while alleviating deformation of the recording medium such as cuckling. To do.

  In order to achieve the above object, one aspect of the recording medium conveying apparatus includes a conveying unit that conveys the recording medium placed in the holding area provided on the holding surface in the conveying direction, and the holding area has the first position. A protrusion arrangement portion provided in a region from the second position to the second position upstream in the transport direction, an intermediate portion provided in a region from the second position to the third position on the upstream side in the transport direction, A land portion provided in a region from the position to the fourth position upstream in the transport direction, and the protrusion arrangement portion includes a plurality of first suction holes for sucking the recording medium, and a first surface from the holding surface. A plurality of protrusions protruding at a height, and the land portion includes a guide portion provided in a region from the third position to a fifth position separated by a first distance upstream in the transport direction; Suction provided in a region from a position 5 to a sixth position spaced a second distance upstream in the transport direction And a rear end placement portion provided in a region from the sixth position to a fourth position spaced a third distance upstream in the transport direction, and the guide portion has a first height from the holding surface. And a plurality of second suction holes for sucking the recording medium, and the suction part has a third suction hole, so that the recording medium is held with a suction force stronger than the suction force in the guide portion. The rear end mounting portion is a base portion protruding at a first height from the holding surface, and the distance from the first position to the sixth position is the minimum due to the dimensional tolerance of the length in the conveyance direction of the recording medium. The distance from the first position to the fourth position is shorter than the value, and is longer than the maximum value due to the dimensional tolerance of the length in the conveyance direction of the recording medium.

  When the recording medium is sucked and held on a holding surface provided with a plurality of protrusions, the inventor has a position where the rear end of the recording medium is lower than the reference surface which is the upper surface of the protrusion (the same height as the bottom surface of the protrusion). When positioned, the knowledge that the trailing edge of the recording medium is lifted by a force to return the recording medium to the reference surface is obtained.

  The present invention has been made on the basis of such knowledge. The recording medium is supported by a plurality of protrusions of the protrusion arrangement portion to alleviate deformation of the recording medium, and the vicinity of the rear end of the recording medium is placed. The land portion is provided with a land portion, and the land portion includes a guide portion that follows the recording medium on the upper surface, a suction portion that sucks the recording medium, and a rear end placement portion that places the rear end of the recording medium. Since the rear end of the recording medium is placed on the rear end placing portion regardless of the dimensional variation of the recording medium, the rear end of the recording medium is prevented from being lifted and the recording medium is sucked and held. It can be stabilized.

  The suction force here refers to the suction force in the suction hole row in which the suction holes are arranged in a direction orthogonal to the transport direction.

  The suction part is an area having the same height as the holding surface, and a plurality of third suction holes are preferably arranged. As a result, the suction portion can be used as a suction groove, and the recording medium can be suctioned appropriately with a suction force stronger than the suction force of the guide portion. In this case, the suction force of the suction portion refers to the suction force in the entire suction groove.

  The third suction hole is circular, and the diameter of the third suction hole is preferably the same as the second distance. As a result, the recording medium can be adsorbed appropriately with an adsorbing force stronger than the adsorbing force in the guide portion.

  The distance in the conveyance direction of the intermediate part is preferably equal to or less than the arrangement interval of the plurality of protrusions of the protrusion arrangement part. Thereby, the area | region of a protrusion arrangement | positioning part can be enlarged as much as possible, and a deformation | transformation of a recording medium can be relieve | moderated about a wide area | region.

  It is preferable that the protrusion arrangement portion, the intermediate portion, and the land portion are arranged corresponding to the length in the conveyance direction and the length in the direction orthogonal to the conveyance direction of the plurality of types of recording media that can be conveyed by the conveyance means. . As a result, for a plurality of types of recording media having different dimensions, it is possible to stabilize the suction and holding of the recording medium while relaxing the deformation of the recording medium.

  The protrusion placement portion, the intermediate portion, and the land portion correspond to the length in the transport direction of the first recording medium and the length in the direction orthogonal to the transport direction among the plurality of types of recording media that can be transported by the transport means. The second recording medium among the plurality of types of recording media that can be transported by the transporting unit inside the first protrusion disposing portion, the first intermediate portion, the first land portion, and the first protrusion disposing portion. It is preferable to have a second intermediate portion and a second land portion corresponding to the length in the transport direction and the length in the direction orthogonal to the transport direction. As a result, with respect to the first recording medium and the second recording medium having a smaller size than the first recording medium, the suction and holding of the recording medium can be stabilized while relaxing the deformation of the recording medium.

  It is preferable to provide positioning means for positioning the leading end of the recording medium at the first position of the conveying means. The positioning means is preferably a gripper that holds the recording medium between the holding surface. Thereby, the front end of the recording medium can be appropriately positioned at the first position.

  Preferably, the conveying means includes a drum that rotates about an axis, and the peripheral surface of the drum constitutes a holding surface. The conveying unit may include an endless belt wound around a plurality of rollers, and the peripheral surface of the belt may constitute a holding surface. Thereby, the recording medium placed on the holding surface can be transported in the transport direction.

  In order to achieve the above object, one aspect of an image recording apparatus includes a transport unit that transports a recording medium placed in a holding area provided on a holding surface in a transport direction, and the holding area is moved from a first position. A protrusion arrangement portion provided in a region up to a second position upstream in the transport direction, an intermediate portion provided in a region from the second position to a third position upstream in the transport direction, and a third position To the fourth position on the upstream side in the conveyance direction, and the protrusion arrangement portion includes a plurality of first suction holes for sucking the recording medium, and a first height from the holding surface. A plurality of protrusions protruding in the direction, and the land part is provided in a region from a third position to a fifth position spaced a first distance upstream in the transport direction, and a fifth part A suction section provided in a region from the position to a sixth position spaced a second distance upstream in the transport direction; And a rear end placement portion provided in a region from the sixth position to the fourth position spaced a third distance upstream in the transport direction, and the guide portion protrudes from the holding surface at the first height. A plurality of second suction holes for sucking the recording medium, and the suction part has a third suction hole for sucking the recording medium with an suction force stronger than the suction force in the guide portion. The rear end placement portion is a base portion protruding from the holding surface at the first height, and the distance from the first position to the sixth position is smaller than the minimum value due to the dimensional tolerance of the length in the conveyance direction of the recording medium. The distance from the first position to the fourth position is longer than the maximum value due to the dimensional tolerance of the length of the recording medium in the conveyance direction, and the image is printed on the recording medium conveyed by the recording medium conveyance device. And image recording means for recording the image.

  According to this aspect, since the suction and holding of the recording medium can be stabilized while the deformation of the recording medium is eased, a high-quality image can be recorded by the image recording unit, and the trailing edge of the recording medium is It does not float and come into contact with the image recording means.

  The image recording means preferably records an image by an ink jet method. This aspect is suitable for an inkjet image recording unit that records an image at a position close to the recording medium.

  According to the present invention, it is possible to stabilize suction holding of a recording medium while relaxing deformation of the recording medium.

FIG. 1 is an overall configuration diagram showing an embodiment of an image recording apparatus according to the first embodiment. FIG. 2 is a perspective view showing the configuration of the first embodiment of the media transport apparatus. FIG. 3 is a development view showing the configuration of the peripheral surface of the image recording drum. FIG. 4 is a partially enlarged view of section 4-4 of FIG. FIG. 5 is an enlarged view of a part of FIG. 3 (a region Z1 surrounded by a broken line). 6 is a cross-sectional view taken along the line 6-6 in FIG. FIG. 7 is an enlarged view of a part of FIG. 3 (a region Z2 surrounded by a broken line). 8 is a cross-sectional view taken along the line 8-8 in FIG. FIG. 9 is a diagram for explaining a suction hole row partially overlapping in the transport direction of the paper P. Figure 10 is a view showing a state where the transport direction length in the image recording drum placing the sheet P ₂ having a sheet P ₁ and the maximum value with the minimum value of the dimensional tolerance. FIG. 11 is a development view showing the configuration of the peripheral surface of the image recording drum. 12 is a partially enlarged view of a section 12-12 in FIG. Figure 13 is a view showing a state where the transport direction length in the image recording drum placing the paper Q ₂ to which a paper Q ₁ and a maximum value having the minimum value of the dimensional tolerance. FIG. 14 is a perspective view showing an image recording apparatus according to the third embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Overall configuration of image recording apparatus>
The image recording apparatus 1 is a sheet-fed ink jet printing machine that prints an image on a sheet of paper (hereinafter referred to as “paper”) that is a sheet recording medium, and uses water-based ink especially for general-purpose printing paper. This is a sheet-fed color ink jet printer that performs color printing.

  General-purpose printing paper is not so-called inkjet paper but cellulose such as coated paper (art paper, coated paper, lightweight coated paper, cast paper, fine coated paper, etc.) used in offset printing, etc. This is a paper mainly composed of Further, the water-based ink refers to an ink in which a coloring material such as a dye or a pigment is dissolved or dispersed in water and a water-soluble solvent.

  As shown in FIG. 1, the image recording apparatus 1 mainly includes a paper feeding unit 10 that feeds paper P and a processing liquid application unit that applies a predetermined processing liquid to the paper P fed from the paper feeding unit 10. 20, a processing liquid drying unit 30 for drying the paper P coated with the processing liquid, an image recording unit 40 for recording an image on the dried paper P by an inkjet method, and a paper P on which an image is recorded. The ink drying unit 50 that performs the drying process and the stacking unit 60 that stacks the dried paper P are configured.

[Paper Feeder]
The paper feeding unit 10 feeds the paper P one by one. As shown in FIG. 1, the paper feeding unit 10 mainly includes a paper feeding device 12, a feeder board 14, a front pad 15, and a paper feeding drum 16.

  The paper feeding device 12 takes out the paper P set at a predetermined position in a bundled state one by one from the top and feeds the paper P one by one to the feeder board 14.

  The feeder board 14 is formed so as to correspond to the width of the paper P, and the front end side is inclined downward. The feeder board 14 guides the paper P fed from the paper feeding device 12 to the front pad 15 by sliding along the transport surface.

  The front pad 15 is a plate-like member arranged orthogonal to the transport direction of the paper P, and is provided so as to be swingable by being driven by a motor (not shown). The front pad 15 swings to correct the posture of the paper P and transfers the paper P whose posture has been corrected to the paper supply drum 16.

  The paper supply drum 16 receives the paper P from the front pad 15, transports it along a predetermined transport path, and delivers it to the processing liquid coating unit 20. The paper supply drum 16 has a cylindrical shape, and grips and rotates the front end of the paper P in the transport direction with a gripper 17 provided on the peripheral surface, thereby winding and transporting the paper P around the peripheral surface.

[Treatment liquid application part]
The processing liquid application unit 20 applies a predetermined processing liquid to the image recording surface of the paper P while conveying the paper P. The treatment liquid applied by the treatment liquid application unit 20 is a liquid having a function of aggregating, insolubilizing or increasing the viscosity of the color material component in the ink. By applying such a treatment liquid to paper, high-quality images can be recorded even when images are recorded on general-purpose printing paper by an inkjet method.

  As shown in FIG. 1, the treatment liquid application unit 20 mainly applies a treatment liquid application drum 22 that conveys the paper P and a treatment liquid that is applied to the image recording surface of the paper P that is conveyed by the treatment liquid application drum 22. And a liquid application device 24.

  The treatment liquid application drum 22 receives the paper P from the paper supply drum 16 of the paper supply unit 10, conveys the received paper P along a predetermined conveyance path, and delivers it to the treatment liquid drying unit 30. The treatment liquid coating drum 22 has a cylindrical shape, and grips and rotates the front end of the paper P in the transport direction with a gripper 23 provided on the peripheral surface, whereby the paper P is wound around the peripheral surface and transported. . The paper P is wound around the peripheral surface of the treatment liquid coating drum 22 and conveyed with the image recording surface facing outward.

  The processing liquid application device 24 applies the processing liquid to the image recording surface of the paper P. In the present embodiment, the processing liquid is applied by pressing a roller (application roller) having a processing liquid applied to the peripheral surface thereof against the image recording surface of the paper P conveyed by the processing liquid application drum 22. Note that the method of applying the treatment liquid is not limited to this, and a method of applying using an inkjet head, a method of applying using a spray, or the like can also be employed.

  The treatment liquid application unit 20 is configured as described above. The processing liquid is applied to the image recording surface by the processing liquid applying device 24 while the paper P is conveyed by the processing liquid applying drum 22.

[Processing liquid drying section]
The processing liquid drying unit 30 dries the paper P while conveying the paper P coated with the processing liquid. The processing liquid drying unit 30 mainly includes a processing liquid drying drum 32 that transports the paper P, and a processing liquid drying device 34 that blows warm air on the paper P transported by the processing liquid drying drum 32 to dry the paper P. And comprising.

  The processing liquid drying drum 32 receives the paper P from the processing liquid coating drum 22 of the processing liquid coating unit 20, transports the received paper P along a predetermined transport path, and delivers it to the image recording unit 40. The treatment liquid drying drum 32 is configured by a frame assembled in a cylindrical shape. The gripper 33 provided on the circumferential surface grips and rotates the front end of the paper P in the transport direction, thereby transporting the paper P. .

  The treatment liquid drying device 34 is installed inside the treatment liquid drying drum 32 and blows hot air toward the paper P conveyed by the treatment liquid drying drum 32.

  The treatment liquid drying unit 30 is configured as described above. In the course of being conveyed by the treatment liquid drying drum 32, the paper P is dried by the treatment liquid drying device 34 by blowing warm air onto the treatment liquid application surface.

(Image recording part)
The image recording unit 40 records a color image on the image recording surface of the paper P using an ink jet method using four colors of ink of cyan, magenta, yellow, and black while transporting the paper P. As shown in FIG. 1, the image recording unit 40 mainly presses the image recording drum 100 that conveys the paper P and the paper P that is conveyed by the image recording drum 100 against the peripheral surface of the image recording drum 100, A pressure roller 42 that brings P into close contact with the image recording drum 100 and a color image is recorded on the paper P by ejecting ink droplets of C, M, Y, and K toward the paper P conveyed by the image recording drum 100. And a scanner 47 that reads an image recorded on the paper P.

  The image recording drum 100 is an example of a conveying unit. The image recording drum 100 receives the paper P from the processing liquid drying drum 32 of the processing liquid drying unit 30, transports the received paper P along a predetermined transport path, and delivers it to the ink drying unit 50. The image recording drum 100 has a cylindrical shape, and grips and rotates the leading end of the paper P with a gripper 102 provided on the peripheral surface, whereby the paper P is wound around the peripheral surface which is a paper holding surface and conveyed.

  Further, the image recording drum 100 is provided with an adsorption mechanism for fixing the paper P being conveyed on the drum. In the image recording drum 100 of the present embodiment, the paper P is adsorbed using negative pressure. The image recording drum 100 has a large number of suction holes on the peripheral surface, which is a paper holding surface, and sucks and fixes the paper P by suction from the inside of the drum through the suction holes.

  The pressing roller 42 is an example of a pressing unit. The pressing roller 42 presses the paper P conveyed by the image recording drum 100 against the peripheral surface of the image recording drum 100, thereby bringing the paper P into close contact with the image recording drum 100. The pressing roller 42 is composed of a rubber roller having a width corresponding to the image recording drum 100. The pressure roller 42 is disposed immediately after the position where the image recording drum 100 receives the paper P from the processing liquid drying drum 32. As a result, the paper P is wound around the circumferential surface of the image recording drum 100 while being pressed against the circumferential surface of the image recording drum 100 by the pressing roller 42.

  The head unit 44 is an image recording means in a broad sense, and is an inkjet head 46C that ejects cyan ink droplets, an inkjet head 46M that ejects magenta ink droplets, an inkjet head 46Y that ejects yellow ink droplets, and black. And an inkjet head 46K that discharges the ink droplets. Each of the inkjet heads 46C, 46M, 46Y, and 46K is disposed on the conveyance path of the paper P by the image recording drum 100.

  Each of the inkjet heads 46C, 46M, 46Y, and 46K is a narrowly-defined image recording unit, and is configured by a line head capable of recording an image with a single pass on the paper P conveyed by the image recording drum 100. Each of the inkjet heads 46C, 46M, 46Y, and 46K has a nozzle surface at the tip, and ejects ink droplets from the nozzles disposed on the nozzle surface toward the paper P conveyed by the image recording drum 100.

  As shown in FIG. 1, the scanner 47 is installed on the downstream side of the head unit 44 with respect to the conveyance direction of the paper P by the image recording drum 100. The scanner 47 reads an image recorded on the paper P by the head unit 44.

  The image recording unit 40 is configured as described above. In the process of transporting the sheet P by the image recording drum 100, ink droplets of the respective colors C, M, Y, and K from the inkjet heads 46C, 46M, 46Y, and 46K constituting the head unit 44 are formed on the image recording surface. As a result, a color image is recorded on the image recording surface. The image recorded on the paper P is read by the scanner 47 as necessary.

[Ink drying section]
The ink drying unit 50 performs the drying process while transporting the paper P immediately after the image recording by the image recording unit 40. As shown in FIG. 1, the ink drying unit 50 is mainly transported by a chain gripper 52 that transports the paper P, a paper guide 54 that guides the travel of the paper P transported by the chain gripper 52, and the chain gripper 52. And a heating and drying device 56 that heats and dries the image recording surface of the paper P to be printed.

  The chain gripper 52 receives the paper P from the image recording drum 100 of the image recording unit 40, transports the received paper P along a predetermined transport path, and discharges it to the stacking unit 60. The chain gripper 52 includes an endless chain 52A that travels along a certain travel path. The chain gripper 52 grips the vicinity of the leading end of the paper P with the gripper 52B provided in the chain 52A and transports the paper P. The paper P is conveyed to the chain gripper 52 and passes through the heating area and the non-heating area set in the ink drying unit 50. The heating area is set to an area where the paper P transferred from the image recording unit 40 is first transported horizontally, and the non-heating area is set to an area where the paper P is transported in an inclined manner.

  The paper guide 54 is disposed along the transport path of the paper P by the chain gripper 52 and guides the travel of the paper P transported by the chain gripper 52. The paper guide 54 includes a first guide board 54A and a second guide board 54B.

  The first guide board 54A is a guide board disposed in the heating region, and has a hollow flat plate shape. The first guide board 54A has an upper surface portion as a guide surface of the paper P, and the paper P is conveyed while sliding on the guide surface.

  A number of suction holes (not shown) are provided on the guide surface of the first guide board 54A. The first guide board 54A guides the travel of the paper P while sucking the paper P against the guide surface by sucking negative pressure from the inside through the suction holes.

  The first guide board 54A is provided with a cooling mechanism (not shown) for cooling the guide surface. The cooling mechanism is constituted by, for example, a water-cooling type cooling mechanism, and cools the guide surface by flowing a cooling liquid through a flow path disposed inside. The first guide board 54A uses the cooling mechanism to control the temperature of the guide surface to a constant temperature.

  The second guide board 54B is a guide board disposed in the non-heated area. The configuration of the second guide board 54B is the same as the configuration of the first guide board 54A. That is, it has a hollow flat plate shape, and guides the travel of the paper P while sucking the paper P against the guide surface by a suction hole (not shown). Further, a cooling mechanism (not shown) is provided, and the temperature of the guide surface is controlled to a constant temperature.

  The heating and drying device 56 is installed in the heating area and heats and dries the image recording surface of the paper P conveyed through the heating area with radiant heat from a heat source. The heating / drying device 56 includes a plurality of infrared lamps 56 </ b> A as heat sources, and is disposed inside the chain gripper 52. The infrared lamps 56A are arranged at regular intervals along the conveyance path of the paper P in the heating area.

  The ink drying unit 50 is configured as described above. In the process of being conveyed by the chain gripper 52, the sheet P is heated by the heating and drying device 56 and dried.

[Accumulator]
The stacking unit 60 stacks the sequentially discharged sheets P at one place. As shown in FIG. 1, the stacking unit 60 mainly includes a stacking device 62 that receives and stacks the paper P conveyed from the ink drying unit 50 by the chain gripper 52.

  The chain gripper 52 releases the grip P by releasing the gripper 52B at a predetermined stacking position. The stacking device 62 collects the released sheets P and stacks them in a bundle.

<Flow of image recording process>
The image recording process is performed in the order of (a) paper feeding, (b) application of processing liquid, (c) drying, (d) image recording, (e) drying, and (f) accumulation.

  When an instruction to start image recording is given, paper feeding from the paper feeding unit 10 is started. The paper P fed from the paper feeding unit 10 is first transported to the processing liquid coating unit 20. Then, the processing liquid is applied to the image recording surface in the course of being conveyed by the processing liquid application drum 22 of the processing liquid application unit 20.

  The paper P coated with the treatment liquid is then conveyed to the treatment liquid drying unit 30. Then, in the process of being conveyed by the treatment liquid drying drum 32 of the treatment liquid drying unit 30, warm air is blown onto the image recording surface for drying treatment.

  The dried paper P is then conveyed to the image recording unit 40. In the process of being conveyed by the image recording drum 100 of the image recording unit 40, ink droplets of cyan, magenta, yellow, and black are applied, and a color image is recorded on the image recording surface.

  The sheet P on which the image is recorded is then conveyed to the ink drying unit 50. Then, in the process of being conveyed by the chain gripper 52 of the ink drying unit 50, the image recording surface is heated by the infrared lamp 56A and dried.

  The dried paper P is transported as it is to the stacking unit 60 by the chain gripper 52 and is collected by the stacking device 62 of the stacking unit 60.

<First Embodiment>
As described above, in the image recording apparatus 1 according to the present embodiment, the recording medium conveying apparatus including the image recording drum 100 and the pressing roller 42 is used as means for conveying the paper P in the image recording unit 40. This recording medium conveying apparatus can convey one or more types of standard paper whose dimensions and dimensional tolerances (dimension tolerances) are known, such as A-line book half-cut, 46-quarter-cut, chrysanthemum half-cut, and 750 mm × 530 mm. . For example, JIS (Japanese Industrial Standards) P0202, JISP0138, and ISO (International Organization for Standardization) 217 are defined for the dimensions and dimensional tolerances of the paper.

  As shown in FIG. 2, the image recording drum 100 has a cylindrical shape with a width that is wider than the width of the paper P to be conveyed, and the shaft portion is supported by a bearing (not shown). A motor 48 as a driving unit is connected to the shaft portion of the image recording drum 100, and the image recording drum 100 rotates about the shaft portion by obtaining rotational power from the motor 48. At this time, the paper P is conveyed by winding the paper P around the holding area 105 (see FIG. 3) of the peripheral surface 104 which is a paper holding surface.

  The image recording drum 100 is provided with grippers 102 at two locations on the outer peripheral surface. The vicinity of the leading edge of the paper P is gripped by the gripper 102, and the leading edge is positioned at a predetermined position.

  A large number of suction holes are regularly arranged on the peripheral surface 104 as will be described later. Inside the image recording drum 100, a vacuum channel (not shown) communicating with the suction hole is provided. The vacuum flow path is connected to a vacuum pump 49 installed outside the image recording drum 100 via the shaft portion of the image recording drum 100. The image recording drum 100 sucks the paper P from each suction hole by driving the vacuum pump 49. The sheet P is sucked from the inside of the image recording drum 100 through the suction holes, and is sucked and held in the holding area 105.

  Note that the range in which the sheet P is sucked from the suction hole is limited to a certain angle range. Here, the position of the sheet P on the image recording drum 100 from the installation position of the pressing roller 42 (the image recording drum 100 is the chain gripper). 52 is configured to adsorb the paper P in a range up to the position where the paper P is delivered to 52).

  The pressing roller 42 is a rubber roller that is a roller having at least an outer peripheral portion made of an elastic body such as rubber. The pressure roller 42 is a position where the paper P is received on the image recording drum 100 (a position where the image recording drum 100 receives the paper P from the processing liquid drying drum 32), and the ink jet heads 46C, 46M, 46Y and 46K. Between the inkjet head 46 </ b> C positioned on the upstream side, the inkjet head 46 </ b> C is installed in a state of being pressed and abutted on the peripheral surface 104 of the image recording drum 100 in parallel with the image recording drum 100. The pressing roller 42 holds the paper P that is wound around the peripheral surface 104 of the image recording drum 100 and is conveyed between the peripheral surface 104 and presses the paper P against the peripheral surface 104, thereby bringing the paper P into close contact with the peripheral surface 104. .

As shown in FIGS. 3 and 4, the holding area 105 on the peripheral surface 104 of the image recording drum 100 is transported from the position A (an example of the first position) where the leading edge of the paper P is positioned by the gripper 102. upstream side position B at a distance d ₁ (the second position of one example) protruding placement unit 106 provided in the region of up to a position C (die at a distance d ₂ from the position B on the upstream side in the conveying direction 3 position of one example) to the intermediate portion 108 provided in a region, and the position C distance in the conveying direction upstream side from the d ₃ the separated position D (fourth land provided in the region of up to one example) of the position of the Part 110 is provided.

  In the present embodiment, the protrusion arrangement unit 106, the intermediate unit 108, and the land unit 110 are provided in a full width region in a direction (axial direction) orthogonal to the conveyance direction of the image recording drum 100. It suffices to be provided in a wider area (length in the axial direction).

3 and 4 are development views of the peripheral surface 104 of the image recording drum 100, the distances d ₁ , d ₂ , and d ₃ are shown as linear lengths. Arc length along the circumference.

As shown in FIGS. 5 and 6, the protrusion arrangement section 106, plurality of cylindrical projections 112 of diameter w _P that protrudes at a height h from the peripheral surface 104 (an example of a first height), the conveying direction And it arrange _| positions with the center space | interval dp in the axial direction. The diameter w _{P of the} protrusion 112 is, for example, 1.0 millimeter, and the center interval d _p of the protrusion 112 is, for example, 2.5 millimeter. Further, suction holes 114 (an example of first suction holes) are disposed between the protrusions 112 in the transport direction, and a vacuum pump 49 (see FIG. 2) is connected to the suction holes 114.

  The shape of the protrusion 112 is not limited to a cylindrical shape, and may be any shape as long as the paper P can be placed on the upper surface.

  As described above, the projections 112 are regularly arranged to form the unevenness, so that the unevenness absorbs deformations such as the cuckles of the paper P placed on the image recording drum 100, and the paper P The protrusions can be brought into intimate contact with each other without causing floating.

As shown in FIGS. 7 and 8, a position B that is a boundary between the protrusion arranging portion 106 and the intermediate portion 108 is an end of the protrusion 112 arranged on the most upstream side in the conveying direction of the protrusion arranging portion 106 on the upstream side in the conveying direction. The position of the part. Intermediate portion 108 is a region of the same height as the peripheral surface 104, in order to maximize the area of the projection arrangement 106, a distance d ₂ from position B to position C, the protrusion 112 of the protrusion arrangement section 106 the same or d _p is smaller than a center distance d _p (an example of the following arrangement interval of the plurality of protrusions). Incidentally, it is preferable that the following distance ends of the adjacent projections 112 _{(d p} -w p).

The land portion 110 is provided with a guide portion 116 and a position E provided in a region from a position C to a position E (an example of a fifth position) separated by a distance d ₃₁ (an example of a first distance) upstream in the transport direction. upstream side to the distance d ₃₂ (an example of a sixth position of) the separated position _(second example of the distance) the suction unit 120 provided in a region of up to F, and from the position F in the conveying direction upstream side from the The rear end placing portion 124 is provided in a region up to a position D separated by a distance d ₃₃ (an example of a third distance).

The guide part 116 is a base part protruding from the peripheral surface 104 at a height h, and is an area for causing the sheet P to follow the upper surface of the base part. The guide portion 116 is provided with a plurality of suction holes 118 (an example of second suction holes) for sucking the paper P, and a vacuum pump 49 (see FIG. 2) is connected to the suction holes 118. For modeled after the paper P placed on the image recording drum 100 to the upper surface of the guide portion 116, a distance _{d 31} to the position E from position C is set to about 10.0 mm.

The suction unit 120 is a region having the same height as the peripheral surface 104 and is a region that sucks the entire width of the paper P. The suction part 120 has a circular opening, and has a suction hole 122 (an example of a third suction hole) having the same diameter d ₃₂ as the transport direction length of the suction part 120 (distance d ₃₂ from position E to position F). A plurality are provided along a direction orthogonal to the transport direction. A vacuum pump 49 (see FIG. 2) is connected to the plurality of suction holes 122.

  The adsorption unit 120 functions as an adsorption groove that adsorbs the paper P, and adsorbs the paper P with an adsorption force stronger than the adsorption force in the guide unit 116.

Here, the suction force in the guide portion 116 and the suction force in the suction portion 120 can be obtained from the vacuum pressure [unit: Pa] and the area of the opening [unit: m ² ]. Each vacuum pressure is measured using a vacuum pressure gauge.

First, a description will be given of a measuring method of the attraction force _{V 1} of the guide portion 116. One arbitrary suction hole 118 is selected from the plurality of suction holes 118 of the guide portion 116. At the point where the selected suction hole 118 (hereinafter referred to as a selective suction hole) is located, a through hole that can be measured by the vacuum pressure gauge is formed in the paper P. The paper P is held in the holding area 105, and the pressure V _P1 [Pa] is measured from a through hole opened in the paper P with a vacuum pressure gauge. Further, a sum S ₁ [m ² ] of the opening areas of the suction holes 118 belonging to the suction hole row in which the selective suction holes are located and perpendicular to the transport direction of the paper P is obtained, and the suction force V _{1 is set} to V ₁ = _Obtained from V _P1 × S ₁ .

Next, a description method for measuring the adsorption force _{V 2} of the suction unit 120. A through hole having the same size as the condition under which the pressure V _P1 is measured is formed in the paper P at an arbitrary point of the suction unit 120. The paper P is held in the holding area 105, and the pressure V _P2 [Pa] is measured from a through hole opened in the paper P with a vacuum pressure gauge. Furthermore, the area S ₂ [m ² ] of the adsorption unit 120 is obtained, and the adsorption force V ₂ is obtained from V ₂ = V _P2 × S ₂ .

If V ₁ and V ₂ thus obtained satisfy the relationship of V ₁ <V ₂ , it can be said that the suction unit 120 is sucking the paper P with a suction force stronger than the suction force of the guide unit 116.

  Here, when the suction hole rows in the direction orthogonal to the conveyance direction of the recording medium P are considered for the guide unit 116, the suction hole rows so that the adjacent suction hole rows partially overlap in the paper P conveyance direction. 118 may be provided. For example, in the example illustrated in FIG. 9A, the suction hole row 119-1 and the suction hole row 119-2 partially overlap in the transport direction of the paper P.

  In this case, assuming that the selective suction hole belongs to the suction hole row 119-1, the above-described "suction hole 118 belonging to the suction hole row where the selective suction hole is located" is as shown in FIG. 9B. In addition to the suction holes 118 belonging to the suction hole row 119-1, among the suction holes 118 belonging to the suction hole row 119-2, the region overlapping with the suction hole row 119-1 is suctioned belonging to the suction hole row 119-1. What is necessary is just to handle as the hole 118. FIG.

The suction part 120 is a base part protruding at a height h from the peripheral surface 104, and the suction hole 122 is arranged in a direction orthogonal to the transport direction of the suction hole 118 of the guide part 116 along the direction orthogonal to the transport direction. May be arranged densely. Method of measuring the adsorption force V ₂ when configured in this way the suction unit 120 are the same as those of the guide portion 116.

  Returning to the description of FIG. 7 and FIG. 8, the rear end placement portion 124 is a region of the base portion protruding from the peripheral surface 104 at a height h, and is a region on which the rear end of the paper P is placed. The image recording drum 100 is configured so that the rear end of the paper P can be always placed on the rear end placement unit 124 regardless of variations in the length in the transport direction of the paper P. The position and the length in the transport direction are defined.

Specifically, the position G to an intermediate position in the conveying direction of the rear mounting portion 124, the distance from the position B to the position G d _4, L mm reference size of the paper P, and dimensional tolerance + [Delta] L _A mm and - If ΔL _B millimeters,
d ₁ + d ₄ = d ₁ + d ₂ + d ₃₁ + d ₃₂ + d _33/2 = L (Formula 1)
d ₃₃ > ΔL _A + ΔL _B (Expression 2)
Meet.

By taking the distance d ₃₃ greater, but it is possible to mount the rear end to the rear end mounting portion 124, in view to maximize the area of the projection arrangement 106, the distance d ₄ is preferably as small as possible. Therefore, the values of the distance d ₃₃ and the distance d ₄ are determined by balancing these. The distance d ₄ is preferably less than 5% of the length in the conveyance direction of the sheet P, more preferably less than 3%, even more preferably less than 2%.

In the present embodiment, the distance d ₄ is know as 15 mm or more and 20 millimeters or less. Further, the distance d ₃₃ is assumed to be ΔL _A + ΔL _B = 4.0 millimeters and is set to about 5.0 millimeters to 6.0 millimeters.

It is not always necessary to satisfy Equation 1 above, the distance from the position A to the position _{F (d 1 + d 4 -d} 33/2) = (d 1 + d 2 + d 31 + d 32), the conveying direction of the paper P The distance from the position A to the position D (d ₁ + d ₄ + d _33/2 ) = (d ₁ + d ₂ ) is shorter than the minimum length (an example of the minimum value due to the dimensional tolerance of the length in the conveyance direction of the recording medium). + D ₃₁ + d ₃₂ + d ₃₃ ) should be longer than the maximum value in the conveyance direction length of the paper P (an example of the maximum value due to the dimensional tolerance of the conveyance direction length of the recording medium). That is,
d ₁ + d ₂ + d ₃₁ + d ₃₂ <L−ΔL _B (Expression 3)
d ₁ + d ₂ + d ₃₁ + d ₃₂ + d ₃₃ > L + ΔL _A (Formula 4)
Satisfy both of these.

  By configuring the rear end placement unit 124 in this way, the rear end of the paper P can always be placed on the rear end placement unit 124 regardless of variations in the dimensions of the paper P.

Paper P ₁ shown in FIG. 10 is a sheet conveying direction length has a minimum value of the dimensional tolerance, the sheet P ₂ is the transport direction length is the paper having the maximum value of dimensional tolerance. As shown in the drawing, the rear end of the paper P _{1 and} the rear end of the paper P ₂ conveyed by the image recording drum 100 are both placed on the rear end placement unit 124. In this way, the rear end of the paper P is always placed on the rear end placement unit 124 regardless of variations in the dimensions of the paper P.

  The image recording unit 40 configured as described above receives the paper P from the treatment liquid drying drum 32 while the image recording drum 100 rotates, and the image recording drum 100 grips the vicinity of the front end of the received paper P by the gripper 102. The leading edge of the paper P is positioned at the position A on the peripheral surface 104. Subsequently, the image recording drum 100 rotates to convey the paper P, and the pressing roller 42 presses the paper P against the peripheral surface 104 of the image recording drum 100 to bring it into close contact with the peripheral surface 104. Further, the sheet P is sucked from the suction holes 114, 118, and 122 by the vacuum pump 49.

  Thereby, in the protrusion arrangement | positioning part 106, the mounted paper P is attracted | sucked by the suction hole 114, and deformation | transformation of the paper P, such as a clack, is eased. In the guide portion 116, the loaded paper P is sucked into the suction hole 118 in a state of following the upper surface of the guide portion 116. In the suction unit 120, the paper P is sucked with a suction force stronger than the suction force in the protrusion placement unit 106 and the guide unit 116. Further, the rear end placement unit 124 places the rear end of the paper P regardless of variations in the length of the paper P in the transport direction. Therefore, the trailing edge of the paper P can be prevented from floating.

  In this way, the image recording unit 40 rotates the image recording drum 100 while holding the sheet P by suction, thereby conveying the sheet P to a position facing the nozzle surfaces of the inkjet heads 46C, 46M, 46Y, and 46K. The inkjet heads 46C, 46M, 46Y, and 46K eject ink droplets from the nozzles arranged on the nozzle surface toward the paper P conveyed to a position facing the nozzle surface, and record an image on the recording surface of the paper P. To do.

  Here, since the deformation of the paper P is relaxed, the slow distances of the ink jet heads 46C, 46M, 46Y, and 46K are constant, and a high-quality image can be recorded. In addition, since the trailing edge of the paper P is prevented from being lifted, the trailing edge of the paper P does not come into contact with the head unit 44 to damage the inkjet heads 46C, 46M, 46Y, and 46K. As described above, the land portion 110 gives priority to the prevention of the trailing edge over the relaxation of the deformation of the paper P.

  The image recording unit 40 further rotates the image recording drum 100 to convey the paper P to the reading position of the scanner 47 and cause the scanner 47 to read the image recorded on the paper P. Thereafter, the paper P is delivered to the chain gripper 52.

  As described above, by providing the protrusion disposing portion 106 on the peripheral surface 104 of the image recording drum 100, deformation of the paper P to be placed such as the cuff can be mitigated. Further, by providing the land portion 110 on the peripheral surface 104, the trailing edge of the paper P can be prevented from being lifted, and the suction and holding can be stabilized.

<Second Embodiment>
The image recording drum according to the second embodiment corresponds to the paper P used in the first embodiment and the paper Q having a smaller size than the paper P and having known dimensions and dimensional tolerances. The land portion is arranged and can transport the paper P and the paper Q (an example of a plurality of types of recording media).

  As shown in FIGS. 11 and 12, the image recording drum 130 includes a protrusion placement portion 106 (an example of a first protrusion placement portion) and an intermediate portion 108 (an example of a first intermediate portion) in a holding region 105 of a peripheral surface 134. ) And a land portion 110 (an example of a first land portion), and in the region of the protrusion placement portion 106, the second intermediate portion 138 (the first intermediate portion 138) is located at a position corresponding to the length in the conveyance direction of the paper Q. 2) and a second land portion 140 (an example of a second land portion).

  The intermediate unit 108 and the land unit 110 are configured in the same manner as the intermediate unit 108 and the land unit 110 of the image recording drum 100 according to the first embodiment. Therefore, the rear end of the paper P can be placed on the rear end placement portion 124 (see FIG. 7) regardless of variations in the length of the transport direction length of the paper P whose front end is positioned at the position A. .

The leading edge of the paper Q is also positioned at the position A. The second intermediate section 138, the position A from the sheet Q upstream side to a distance d ₅ a spaced position H position at a distance d ₆ in the conveying direction upstream side from the (second example of a position) I (Part an example of a position of 3) provided in the region of up to, the second land portion 140 is provided in the region up to at a distance d ₇ in the conveying direction upstream side from the position I position J (an example of a fourth position) ing.

The second intermediate portion 138 and the second land portion 140 have a width w _L wider than the width of the paper Q (the length in the direction orthogonal to the transport direction). In addition, from the viewpoint of alleviating deformation of the paper P when the paper P is sucked and held, it is preferable that the width of the second intermediate portion 138 and the second land portion 140 is not wider than necessary.

The position H, which is the boundary between the protrusion placement portion 106 and the second intermediate portion 138, is the position of the end portion on the upstream side in the transport direction of the protrusion 112 disposed adjacent to the downstream end portion in the transport direction of the second land portion 140. It is. The second intermediate portion 138 is a region having the same height as the peripheral surface 134, and the length in the transport direction (distance d ₆ from the position H to the position I) is the center distance d _p of the protrusion 112 of the protrusion disposition portion 106. Smaller than.

The second land portion 140 is provided in a region from a position I to a position K (an example of a fifth position) separated by a distance d ₇₁ (an example of a first distance) upstream in the transport direction. 146, a second suction unit 150 provided in a region from a position K to a position L (an example of a sixth position) separated by a distance d ₇₂ (an example of a first distance) on the upstream side in the transport direction, and a position L And a second rear end placement portion 154 provided in a region up to a position J separated by a distance d ₇₃ (an example of a first distance) on the upstream side in the transport direction.

  The configurations of the second guide portion 146, the second suction portion 150, and the second rear end placement portion 154 are the same as the configurations of the guide portion 116, the suction portion 120, and the rear end placement portion 124, respectively.

Here, the intermediate position in the transport direction of the second rear end placing portion 154 is the position M, the distance from the position H to the position M is d ₈ , the reference dimension of the paper Q is L _Q millimeter, the dimensional tolerance is + ΔL _QA millimeter, and -ΔL _QB millimeters
d ₅ + d ₈ = d ₅ + d ₆ + d ₇₁ + d ₇₂ + d _73/2 = L _Q (Formula 5)
d ₇₃ > ΔL _QA + ΔL _QB (Expression 6)
Meet. In addition,
d ₅ + d ₆ + d ₇₁ + d ₇₂ <L _Q −ΔL _QB (Expression 7)
d ₅ + d ₆ + d ₇₁ + d ₇₂ + d ₇₃ > L _Q + ΔL _QA (Equation 8)
An embodiment satisfying both of these is also possible.

  As described above, even when the conveyance direction length of the paper Q has the maximum value of the dimensional tolerance, the rear end of the paper Q can be placed on the second rear end placement portion 154.

Paper Q ₁ shown in FIG. 13 is a sheet conveying direction length has a minimum value of the dimensional tolerance, paper Q ₂ are conveying direction length is paper having a maximum value of the dimensional tolerance. As shown in the drawing, the rear end of the paper Q _{1 and} the rear end of the paper Q ₂ conveyed by the image recording drum 130 are both placed on the second rear end placement portion 154. In this way, the rear end of the paper P is always placed on the second rear end placement portion 154 regardless of variations in the dimensions of the paper P.

  According to the image recording drum 130 configured as described above, when the paper P is transported, the same effect as the image recording drum 100 according to the first embodiment is obtained.

  Further, when transporting the paper Q, the projection paper placement unit 106 sucks the placed paper Q into the suction holes 114, and the deformation of the paper Q such as cuckling is alleviated. Further, in the second guide portion 146, the placed paper Q is sucked into the suction hole in a state of following the upper surface of the second guide portion 146. In the second suction unit 150, the paper Q is sucked with a suction force stronger than the suction force in the protrusion placement unit 106 and the second guide unit 146. Further, the second trailing edge placement unit 154 places the trailing edge of the paper Q regardless of variations in the length of the conveyance direction of the paper Q. Therefore, the trailing edge of the paper Q can be prevented from floating.

<Third Embodiment>
The image recording apparatus according to the third embodiment includes a recording medium conveying apparatus that conveys the paper P in a belt.

  As shown in FIG. 14, the image recording apparatus 200 includes a recording medium transport apparatus 210 and a head unit 44.

  The recording medium transport device 210 has a structure in which an endless belt 230 is wound around rollers 212 and 214.

  The belt 230 is made of rubber or urethane, and has a width that is wider than the width of the paper P being conveyed. The belt 230 is configured such that an outer peripheral surface 234 serves as a holding surface on which the paper is placed, and the outer peripheral surface 234 is configured to be a horizontal surface (flat surface) at least at a position facing the head unit 44. The configuration of the outer peripheral surface 234 will be described later.

  Further, the recording medium transport apparatus 210 includes an adsorption chamber 216 at a position facing the head unit 44 and sandwiching the belt 230. By sucking the suction chamber 216 with a fan (not shown) to make it a negative pressure, the paper P placed on the outer peripheral surface 234 of the belt 230 is sucked and held.

  A motor (not shown) serving as a driving unit is connected to at least one of the rollers 212 and 214 around which the belt 230 is wound. For example, when a motor is connected to the roller 212, the roller 212 obtains rotational power from the motor and rotates in the direction of the solid arrow in FIG. Due to this rotation, the belt 230 travels in the direction of the broken line arrow in FIG. 14, and the roller 214 follows the belt 230 and rotates in the direction of the solid line arrow. Therefore, the paper P placed on the outer peripheral surface 234 of the belt 230 is conveyed from the roller 212 side to the roller 214 side in the direction of the broken arrow.

  In addition, the recording medium transport device 210 includes a pressing roller 218 at the receiving position of the paper P. The pressing roller 218 is a rubber roller similar to the pressing roller 42 according to the first embodiment. The pressing roller 218 is installed in a state of being pressed against and in contact with the outer peripheral surface 234 of the belt 230 in parallel with the roller 212 and facing the roller 212. The pressing roller 218 sandwiches the paper P, which is placed on the outer peripheral surface 234 of the belt 230 and conveyed, and presses the paper P against the outer peripheral surface 234, thereby bringing the paper P into close contact with the outer peripheral surface 234.

  The head unit 44 includes inkjet heads 46C, 46M, 46Y, and 46K as in the first embodiment. The inkjet heads 46C, 46M, 46Y, and 46K are arranged at a constant interval along the conveyance path of the paper P by the belt 230. The inkjet heads 46C, 46M, 46Y, and 46K are constituted by line heads corresponding to the width of the paper P, and are arranged substantially orthogonal to the conveyance direction of the paper P by the belt 230, and the nozzle surfaces thereof are arranged. It arrange | positions so that the outer peripheral surface 234 of the belt 230 may be opposed. Each of the inkjet heads 46C, 46M, 46Y, and 46K discharges ink droplets from the nozzles formed on the nozzle surface toward the belt 230, thereby causing the recording medium conveyance device 210 to convey the paper P. Images can be recorded with a single pass.

  In the image recording apparatus 200 configured as described above, the paper P passes between the pressing roller 218 and the belt 230 and is placed on the outer peripheral surface 234 of the belt 230. The paper P placed on the outer peripheral surface 234 is sucked and held on the outer peripheral surface 234 by the suction chamber 216 and is transported in the transport direction as the belt 230 travels.

  When the paper P reaches a position facing the head unit 44, ink is ejected from each of the inkjet heads 46C, 46M, 46Y, and 46K, and a color image is recorded on the recording surface of the paper P. Thereafter, the paper P is discharged from a paper discharge unit (not shown).

  The configuration of the outer peripheral surface 234 of the belt 230 is the same as the configuration of the peripheral surface 104 of the image recording drum 100 shown in FIG. 3 and the peripheral surface 134 of the image recording drum 130 shown in FIG. The gripper 102 shown in FIGS. 3 and 11 is not provided in the recording medium transport apparatus 210 shown in FIG. 14, but the recording medium transport apparatus 210 may include the gripper 102. When the gripper 102 is not provided, the position A where the leading edge of the paper P is positioned is preferably a position where the protrusion 112 of the protrusion arranging portion 106 is disposed from the viewpoint of preventing the leading edge from being lifted.

  By configuring the outer peripheral surface 234 of the belt 230 in this manner, the placed paper P is adsorbed by the protrusion placement unit 106, and deformation of the paper P such as cuckling is alleviated. In the guide portion 116, the loaded paper P is sucked in a flat state following the upper surface of the guide portion 116. In the suction unit 120, the paper P is sucked with a suction force stronger than the suction force in the protrusion placement unit 106 and the guide unit 116. Further, the rear end placement unit 124 places the rear end of the paper P regardless of manufacturing variations in the length in the transport direction of the paper P. Therefore, the trailing edge of the paper P can be prevented from floating.

  In the present embodiment, an image recording apparatus using a line head corresponding to the width of the paper P has been described. However, a plurality of head scans are performed while moving a short recording head such as a serial type (shuttle scan type) head. The present invention may be applied to an image recording apparatus that performs image recording.

  The technical scope of the present invention is not limited to the scope described in the above embodiment. The configurations and the like in the respective embodiments can be appropriately combined among the respective embodiments without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1,200 ... Image recording device, 40 ... Image recording part, 44 ... Head unit, 49 ... Vacuum pump, 100 ... Image recording drum, 102 ... Gripper, 104 ... Peripheral surface, 105 ... Holding area, 106 ... Projection arrangement part, 108 ... intermediate part, 110 ... land part, 112 ... protrusion, 114,118,122 ... suction hole, 116 ... guide part, 120 ... suction part, 124 ... rear end placement part, 138 ... second intermediate part, 140 ... Second land portion, 146 ... second guide portion, 150 ... second suction portion, 154 ... second rear end placement portion, 210 ... recording medium conveying device, 212, 214 ... roller, 216 ... adsorption chamber, 230 ... belt 234 ... outer peripheral surface

Claims (12)

A transport means for transporting the recording medium placed in the holding area provided on the holding surface in the transport direction;
The holding area includes a protrusion arrangement portion provided in an area from a first position where a leading end of the recording medium is positioned to a second position upstream in the conveyance direction, and the conveyance direction from the second position. An intermediate portion provided in a region up to the third position on the upstream side, and a land portion provided in a region from the third position to the fourth position on the upstream side in the transport direction,
The protrusion arrangement portion has a plurality of first suction holes for sucking the recording medium, and a plurality of protrusions protruding at a first height from the holding surface,
The land portion includes a guide portion provided in a region from the third position to a fifth position spaced a first distance upstream in the transport direction, and an upstream side in the transport direction from the fifth position. A suction portion provided in a region up to a sixth position separated by a second distance, and a region from the sixth position to a fourth position separated by a third distance upstream in the transport direction. The rear end mounting portion provided,
The guide part is a base part protruding from the holding surface at the first height, and has a plurality of second suction holes for sucking the recording medium,
The suction part has a third suction hole, and sucks the recording medium with a suction force stronger than the suction force in the guide part;
The rear end placement part is a base part protruding from the holding surface at the first height, and the distance from the first position to the sixth position is a dimension of the length in the conveyance direction of the recording medium. A recording medium conveying apparatus that is shorter than a minimum value due to tolerance and whose distance from the first position to the fourth position is longer than a maximum value due to dimensional tolerance of the length in the conveying direction of the recording medium.   The recording medium conveyance device according to claim 1, wherein the suction portion is a region having the same height as the holding surface, and a plurality of the third suction holes are arranged.   3. The recording medium conveying apparatus according to claim 1, wherein the third suction hole is circular, and a diameter of the third suction hole is the same as the second distance.   4. The recording medium conveyance device according to claim 1, wherein a distance of the intermediate portion in the conveyance direction is equal to or less than an arrangement interval of the plurality of protrusions of the protrusion arrangement portion. 5.   The protrusion placement portion, the intermediate portion, and the land portion correspond to the length in the transport direction and the length in the direction perpendicular to the transport direction of the plurality of types of recording media that can be transported by the transport means. The recording medium conveying apparatus according to claim 1, wherein the recording medium conveying apparatus is disposed. The protrusion placement portion, the intermediate portion, and the land portion are
A first protrusion disposing portion corresponding to a length in the transport direction and a length in a direction perpendicular to the transport direction of the first recording medium among the plurality of types of the recording media that can be transported by the transport means; An intermediate portion of 1 and a first land portion;
The length of the second recording medium of the plurality of types of recording media that can be transported by the transporting unit and the length in the direction perpendicular to the transporting direction are inside the first protrusion placement portion. A corresponding second intermediate portion and a second land portion;
The recording medium carrying device according to claim 5 having   The recording medium transport apparatus according to claim 1, further comprising a positioning unit that positions a leading end of the recording medium at the first position of the transport unit.   The recording medium transport apparatus according to claim 7, wherein the positioning unit is a gripper that sandwiches the recording medium with the transport unit.   The recording medium conveyance device according to claim 1, wherein the conveyance unit includes a drum that rotates about an axis, and a peripheral surface of the drum constitutes the holding surface.   The recording medium conveying apparatus according to claim 1, wherein the conveying unit includes an endless belt wound around a plurality of rollers, and a peripheral surface of the belt forms the holding surface. A recording medium conveying apparatus according to any one of claims 1 to 10,
Image recording means for recording an image on the recording medium conveyed by the recording medium conveying device;
An image recording apparatus comprising:   The image recording apparatus according to claim 11, wherein the image recording unit records an image by an inkjet method.

Images