JP3864791B2 - Recording medium conveying device and image recording device having the same - Google Patents

Recording medium conveying device and image recording device having the same Download PDF

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Publication number
JP3864791B2
JP3864791B2 JP2002016501A JP2002016501A JP3864791B2 JP 3864791 B2 JP3864791 B2 JP 3864791B2 JP 2002016501 A JP2002016501 A JP 2002016501A JP 2002016501 A JP2002016501 A JP 2002016501A JP 3864791 B2 JP3864791 B2 JP 3864791B2
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Japan
Prior art keywords
area
recording medium
recording
region
suction
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Expired - Fee Related
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JP2002016501A
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Japanese (ja)
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JP2003211749A (en
Inventor
康浩 田中
正秋 辻
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ノーリツ鋼機株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a recording medium conveying apparatus that can convey a recording medium while ensuring flatness, and an image recording apparatus including the recording medium conveying apparatus.
[0002]
[Prior art]
  2. Related Art Inkjet printers that perform printing by spraying liquid ink onto paper are known in which ink is ejected from a print head that reciprocates along a direction perpendicular to the paper transport direction to print an image. . In particular, when roll paper is used as the paper, an adsorption method is often employed to ensure the flatness of the printing surface of the paper.
[0003]
  Here, the suction-type ink jet printer has a suction plate having the same height as the paper transport surface arranged opposite to the print head and formed with a plurality of suction holes, and the suction plate has a suction hole. Some have a suction fan for sucking the sheet onto the surface of the suction plate.
[0004]
  The suction plate of the suction type ink jet printer has a large number of the same size along the paper transport direction so that the paper transported on the suction plate is transported while being properly attracted to the surface of the suction plate. In general, the adsorption holes are arranged almost uniformly. In addition, even when printing is performed on paper having a width substantially the same as the width of the suction plate, a large number of the same size over the entire width of the suction plate so that the paper is conveyed while being properly sucked on the surface of the suction plate. In many cases, the suction holes are arranged almost uniformly.
[0005]
  Therefore, in such an ink jet printer, almost the entire surface of the paper disposed facing the print head is conveyed while being in close contact with the surface of the suction plate, so that the flatness of the printing surface of the paper is ensured. For this reason, since the gap (gap) between the print head and the paper is kept substantially constant, deterioration of the image printed on the paper is suppressed.
[0006]
[Problems to be solved by the invention]
  However, when printing is performed on the vicinity of the front end of the sheet or when printing is performed on a sheet having a width that is significantly smaller than the width of the suction plate, the sheet is placed in a number of suction holes formed on the suction plate. Only a few adsorption holes are blocked by contact. That is, many suction holes of the suction plate are opened without being closed. Therefore, the negative pressure in the suction hole closed by the paper generated by the suction fan to suck the paper becomes extremely small, and the paper is not properly sucked on the suction plate. For this reason, the flatness of the printing surface of the paper is not ensured, resulting in a problem that the image printed on the paper deteriorates. Further, when a part of the paper is greatly separated from the suction plate, the part of the paper may be caught by the reciprocating print head and the paper may be jammed.
[0007]
  In order to solve such a problem, there is a case where a large suction fan is provided and the air volume of the suction fan is controlled depending on the position of the sheet with respect to the suction plate. In other words, even if only a small number of suction holes are blocked by the contact of paper among the many suction holes formed in the suction plate, the paper is sucked onto the suction plate by a sufficient negative pressure. The air volume of the suction fan is controlled. In this case, an increase in the size of the suction fan causes an increase in the size and cost of the printer, and complicated control of the suction fan is required.
[0008]
  Accordingly, a main object of the present invention is to provide a recording medium conveying apparatus capable of conveying a recording medium while reliably adsorbing the recording medium to the auxiliary member regardless of the position of the leading end of the recording medium with respect to the auxiliary member, and an image recording apparatus including the recording medium conveying apparatus. Is to provide.
[0009]
  Another object of the present invention is to provide a recording medium conveying apparatus capable of conveying a recording medium while reliably adsorbing the recording medium to an auxiliary member regardless of the width of the recording medium, and an image recording apparatus including the recording medium conveying apparatus. It is.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, a recording medium conveying apparatus according to claim 1 comprises:RecordA conveying means for conveying the recording medium and a conveying surface of the recording medium disposed opposite to the image recording unit for recording an image on the recording medium conveyed by the conveying means at substantially the same height. An auxiliary member having at least one opening formed in a recording area substantially opposite to the image recording unit, and an adsorption for adsorbing a recording medium to the surface of the auxiliary member through the opening of the auxiliary member Means, and in the recording area,Includes a portion in the vicinity of the reference position in the width direction of the recording medium on the auxiliary memberAn aperture ratio which is a total opening area of the first region and the opening per unit area is smaller than that of the first region;In a direction perpendicular to the conveyance direction of the recording medium with respect to the first areaThe second area is provided, and the second area is provided.
[0011]
  Here, the “aperture ratio” indicates the ratio of the total area of all the openings formed in the region to the area of the entire range in the region in which at least one opening is formed. Yes. Therefore, the aperture ratio of the region in which the opening is formed varies depending on the number of openings formed in the region and the area per opening. The “recording area substantially facing the image recording unit” may be only the area facing the image recording unit, or the area facing the image recording unit and the upstream side of the recording medium in the conveyance direction of the recording medium. It may include at least one of a region near the side and a region near the downstream side in the transport direction.
[0012]
  According to claim 1,The first area is arranged in a direction perpendicular to the conveyance direction of the recording medium.Since the aperture ratio of the second region is smaller than the aperture ratio of the first region,Recording medium having a width smaller than the width of the auxiliary memberIs adsorbed on the auxiliary member by the opening formed in the first region, it is possible to suppress the negative pressure in the opening formed in the first region from becoming extremely small. Therefore, the recording mediumBodyThe opening formed in the first region is surely adsorbed on the auxiliary member. ThisRegardless of the width of the recording mediumThe recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore, the deterioration of the image recorded on the recording medium due to the fact that the flatness of the recording surface of the recording medium is not ensured is suppressed, and the occurrence of clogging of the recording medium is suppressed. Further, the suction fan does not need to be made larger than necessary, and complicated control for the suction fan is eliminated.
[0013]
  According to a second aspect of the present invention, there is provided a recording medium transporting apparatus, wherein the recording unit is disposed opposite to a transporting unit for transporting the recording medium and an image recording unit for recording an image on the recording medium transported by the transporting unit. An auxiliary member having substantially the same height as the medium conveyance surface and having at least one opening formed in a recording area substantially opposite to the image recording unit, and a recording medium through the opening of the auxiliary member Is adsorbed on the surface of the auxiliary member, and in the recording area,Including the portion of the recording area closest to the upstream side in the conveyance direction of the recording medium and including the portion of the auxiliary member near the reference position in the width direction of the recording mediumThe first area and the aperture ratio, which is the total opening area of the openings per unit area, are smaller than the first area and are arranged in a direction perpendicular to the conveyance direction of the recording medium with respect to the first area. A second region,A third area having an aperture ratio smaller than that of the first area and disposed on the downstream side of the first area with respect to the conveyance direction of the recording medium;Is provided.
[0014]
  According to claim 2, the second area arranged in a direction perpendicular to the conveyance direction of the recording medium in the first area.And a third area disposed downstream of the first area in the conveyance direction of the recording mediumWhen the recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by the opening formed in the first area.When only the vicinity of the front end of the recording medium is adsorbed on the auxiliary member by the opening formed in the first areaThus, it is possible to suppress the negative pressure at the opening formed in the first region from becoming extremely small. Therefore, the recording medium is reliably adsorbed on the auxiliary member by the opening formed in the first region. As a result, the width of the recording mediumAnd the tip position of the recording medium with respect to the auxiliary memberRegardless, the recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore, the deterioration of the image recorded on the recording medium due to the fact that the flatness of the recording surface of the recording medium is not ensured is suppressed, and the occurrence of clogging of the recording medium is suppressed. Further, the suction fan does not need to be made larger than necessary, and complicated control for the suction fan is eliminated.
  According to a third aspect of the present invention, the plurality of second regions and the plurality of third regions are provided such that the aperture ratio gradually decreases as the distance from the first region increases. It is characterized by being.
  According to the third aspect, when the recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by the opening formed in the first region, and / or only the front end portion of the recording medium is the first. In the case of being adsorbed on the auxiliary member by the opening formed in the region, it is possible to effectively suppress the negative pressure in the opening formed in the first region from becoming extremely small. Therefore, the recording medium is more reliably adsorbed on the auxiliary member by the opening formed in the first region.
[0015]
  Claims4The recording medium transport device ofRecordA conveying means for conveying the recording medium and a conveying surface of the recording medium disposed opposite to the image recording unit for recording an image on the recording medium conveyed by the conveying means at substantially the same height. An auxiliary member having at least one opening formed in a recording area substantially opposite to the image recording unit, and an adsorption for adsorbing a recording medium to the surface of the auxiliary member through the opening of the auxiliary member The recording area includes a portion of the recording area most upstream in the conveyance direction of the recording medium and in the vicinity of the center position in the width direction.And a portion in the vicinity of the reference position in the width direction of the recording medium on the auxiliary member.A first region,A second area having an aperture ratio, which is a total opening area by the openings per unit area, smaller than that of the first area and perpendicular to the conveyance direction of the recording medium with respect to the first area; A third area having an aperture ratio smaller than that of the first area and disposed on the downstream side of the first area with respect to the conveyance direction of the recording medium;Is provided.
[0016]
  Claim4according to,A second area arranged in a direction perpendicular to the conveyance direction of the recording medium in the first area;Downstream of the recording medium in the transport direction from the first area3rd area arranged inIs smaller than the aperture ratio of the first region,ContractSimilar to claim 2,Width of the recording medium andThe leading edge position of the recording medium relative to the auxiliary memberIn placeRegardless, the recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore,ContractThe same effect as in Claim 2 can be obtained.
[0017]
  Claims5The recording medium conveying apparatus is characterized in that a plurality of the second areas are provided such that the aperture ratio gradually decreases as the distance from the first area increases.
[0018]
  Claim5according to,When a recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by an opening formed in the first region and / orWhen only the front end of the recording medium is adsorbed on the auxiliary member by the opening formed in the first areaTogetherIn this case, it is possible to effectively suppress the negative pressure at the opening formed in the first region from becoming extremely small. Therefore, the recording medium is more reliably adsorbed on the auxiliary member by the opening formed in the first region.
[0019]
  Claims6Are claims 1 to5An image recording apparatus comprising the recording medium conveying apparatus according to any one of the above. Claim6According to this, since the flatness of the recording surface of the recording medium conveyed while being opposed to the image recording unit by the recording medium conveying device is ensured, a high-quality image can be recorded on the recording medium. Further, the increase in the size and the cost of the printer can be suppressed by suppressing the increase in the size of the recording medium conveyance device.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an ink jet printer provided with a paper transport device according to an embodiment of the present invention. FIG. 2 is a diagram showing a schematic configuration in the vicinity of the suction plate included in the ink jet printer of FIG. FIG. 3 is a diagram illustrating a schematic configuration of a plurality of areas formed in the suction area along the sheet conveyance direction. FIG. 4 is a diagram illustrating a schematic configuration of a plurality of regions formed in the suction region along the width direction of the suction plate. FIG. 5 is a diagram for explaining the operation of the ink jet printer shown in FIG. 6 is a diagram showing a schematic configuration in the vicinity of the suction plate included in the ink jet printer of FIG.
[0021]
  The ink jet printer 1 shown in FIG. 1 has a transport roller unit 5, an ink jet printing unit 6, a pressure roller unit 7, a cutting unit 8, and a discharge roller unit 9 in a substantially rectangular housing 30. ing. A long sheet 2 in which a winding part 2 a wound in a roll shape is formed is disposed in the housing 30, and the winding part 2 a of the sheet 2 is rotatable around the axis center. Held on the drum 3. Further, as will be described later, the operation of each part of the ink jet printer 1 is controlled by a controller 20 disposed in the housing 30.
[0022]
  The transport roller unit 5 is a pair of drive rollers that are driven by a motor 21 controlled by a controller 20, and is for unwinding the paper 2 from the winding part 2 a and supplying it to the ink jet printing unit 6. That is, the transport roller unit 5 unwinds the paper 2 from the winding unit 2a and transports the paper 2 to the downstream side, and sequentially passes the ink jet printing unit 6 and the cutting unit 8.
[0023]
  The ink jet printing unit 6 includes a print head 11, a carriage 12, a suction plate 13, and a suction fan 14. The print head 11 includes a number of ejection nozzles (not shown) that can eject color inks such as yellow (yellow), magenta (red purple), cyan (blue green), and black. Accordingly, the print head 11 discharges the color ink from a large number of discharge nozzles toward the surface (upper surface in FIG. 1) of the conveyed paper 2 based on the signal from the controller 20 to obtain a desired color. Images can be printed. Note that the number and arrangement of the discharge nozzles can be arbitrarily changed. The print head 11 may have a discharge nozzle that discharges only black ink, and may print a black and white image.
[0024]
  The ink jet printing unit 6 prints liquid ink from a nozzle for each dot and prints on the paper 2, and adopts any one of a piezo jet method, a thermal jet method, and other methods. Also good.
[0025]
  The carriage 12 is for holding the print head 11 and can reciprocate in a direction perpendicular to the conveyance direction of the paper 2. Accordingly, the print head 11 ejects ink toward the surface of the paper 2 while reciprocating in a direction perpendicular to the conveyance direction of the paper 2.
[0026]
  As shown in FIG. 2, the suction plate 13 has a paper support surface that is the same height as the transport surface of the paper 2, and supports the paper 2 that is disposed to face the print head 11. Accordingly, the print head 11 performs printing on the paper 2 on the suction plate 13 while reciprocating along the width direction of the suction plate 13 while facing the surface of the suction plate 13. Here, the print area 51 that can face the print head 11 on the suction plate 13 has substantially the same length as the print head 11 (length in the direction along the conveyance direction of the paper 2), and the entire width of the suction plate 13. This is a band-shaped region formed over the entire area.
[0027]
  Further, the suction plate 13 has a print area 51 or an area having a predetermined length from the print area 51 on the upstream side and the downstream side in the transport direction of the paper 2 in the print area 51 (hereinafter referred to as “suction area 52”). A large number (65 in this embodiment) of circular suction holes 15 (including suction holes 15a described later) are formed over the entire width of the suction plate 13. That is, the suction area 52 includes the printing area 51, and is a rectangular area having substantially the same length as the distance between the transport roller unit 5 and the pressure roller unit 7 and the same width as the width of the suction plate 13. In this region, a large number of suction holes 15 are formed.
[0028]
  The suction holes 15 formed in the suction region 52 of the suction plate 13 are arranged in a zigzag at each center position. Accordingly, the large number of suction holes 15 are arranged substantially evenly in the suction region 52. That is, as shown in FIG. 3, a plurality of suction hole rows 16 including six suction holes 15 that are arranged in a row along the width direction of the suction plate 13 and whose center positions are arranged at equal intervals, A plurality of suction hole arrays 17 including seven suction holes 15 that are arranged in a line along the width direction of the suction plate 13 and whose center positions are arranged at equal intervals, along the transport direction of the paper 2. Alternatingly arranged. Therefore, the center positions of all the suction holes 15 are arranged at equal intervals. At this time, with respect to the transport direction of the paper 2, a plurality of suction hole arrays including five suction holes 15 arranged in a line along the transport direction of the paper 2 and arranged at equal intervals. 18 will be arranged (see FIG. 4).
[0029]
  Further, in the suction area 52, an area arranged so as to be symmetric with respect to the center position in the width direction of the suction plate 13 in the vicinity of the center position in the width direction of the suction plate 13 on the upstream side in the transport direction of the paper 2. 53 is provided. Here, the length of the region 53 in the direction along the width direction of the suction plate 13 is smaller than the length of the suction region 52 in the direction along the width direction of the suction plate 13. In the region 53, two large-diameter suction holes 15 a are formed so as to be symmetric with respect to the center position in the width direction of the suction plate 13.
[0030]
  Here, the size of each of the suction holes 15 other than the suction holes 15 a in the suction region 52 gradually decreases as the distance from the region 53 increases. That is, the diameters of the suction holes 15 in the region 52 are respectively set on the downstream side in the transport direction of the paper 2 in the region 53 as the suction holes 15 move away from the upstream side in the transport direction of the paper 2 from the region 53. The diameter of the is gradually becoming smaller. Further, the respective diameters of the suction holes 15 in the region 52 gradually become smaller as they move away from the vicinity of the center position in the width direction of the suction plate 13 toward the outer side in the width direction.
[0031]
  Therefore, as shown in FIG. 3, in the suction area 52, areas 61 to 61 in which a pair of suction hole arrays 16 and suction hole arrays 17 are formed from the upstream side to the downstream side in the conveyance direction of the sheet 2. Assuming that 65 is provided, each of the aperture ratios of the regions 61 to 65 has the largest aperture ratio of the region 61, gradually decreases in the order of the regions 62 to 64, and the aperture ratio of the region 65 becomes the smallest. .
[0032]
  Further, as shown in FIG. 4, areas 71 to 77 each having one suction hole array 18 are provided in the suction area 52 from the center position in the width direction of the suction plate 13 toward the outside. As a result, the aperture ratio of each of the regions 72 to 77 is the largest in the region 72, gradually decreases in the order of the regions 73 to 76, and the aperture ratio in the region 77 is the smallest. Here, the regions 72 to 77 are configured by two regions which are arranged so as to be symmetric with respect to the region 71 provided at the center position in the width direction of the suction plate 13 and have the same aperture ratio. The aperture ratio of the region 71 is a value between the aperture ratio of the region 72 and the aperture ratio of the region 73.
[0033]
  Thus, in the region 52, as the distance from the region 53 toward the downstream side in the transport direction of the paper 2 is increased, the aperture ratio of the region having the same size as the region 53 is reduced, and the suction plate 13 from the region 53 is reduced. As the distance from the outer side in the width direction increases, the aperture ratio of the region having the same size as the region 53 decreases. Therefore, it can be seen that the aperture ratio of the region 53 is maximized in the suction region 52.
[0034]
  The suction fan 14 is disposed at a position facing the print head 11 across the conveyance path of the paper 2 and sucks the paper 2 on the suction plate 13 through the suction holes 15 formed in the suction plate 13. belongs to. Accordingly, the sheet 2 facing the print head 11 is conveyed in close contact with the suction plate 13 by being sucked by the suction fan 14 disposed on the back surface (lower surface in FIG. 1) side of the sheet 2. The interval between is fixed. This is to suppress the occurrence of printing defects due to a change in the distance from the print head 11 when a part of the sheet 2 is greatly separated from the suction plate 13 when the sheet 2 is curled.
[0035]
  The pressure roller unit 7 is for sandwiching the paper 2 conveyed between the inkjet printing unit 6 and the cutting unit 8. Note that the pressure roller unit 7 is disposed between the inkjet printing unit 6 and the cutting unit 8 so that the printing of the image by the inkjet printing unit 6 and the cutting of the paper 2 by the cutting unit 8 can be appropriately performed. Become.
[0036]
  The cutting unit 8 has a movable blade 8a disposed on the same side as the print head 11 with respect to the paper 2 and a fixed blade 8b disposed to face the movable blade 8a with the paper 2 interposed therebetween. . Both the movable blade 8 a and the fixed blade 8 b are rectangular blades having a width slightly larger than the width of the paper 2. The movable blade 8a can be moved toward or away from the fixed blade 8b by a motor 22 controlled by the controller 20, and the printed paper 2 conveyed from the upstream side through the conveyance path can be removed. It is possible to cut along the width direction by the interaction with the fixed blade 8b. By cutting in this way, the printed paper 2 having a predetermined length is divided.
[0037]
  The discharge roller unit 9 is a pair of drive rollers driven by a motor 23 controlled by the controller 20, and conveys the printed paper 2 that has been cut by the cutting unit 8, and discharges it from the discharge port 30a.
[0038]
  Further, the controller 20 performs predetermined processing on the image signal supplied from an input interface (not shown), and supplies a print signal including image data corresponding to the image to be printed to the inkjet printing unit 6. The controller 20 controls the conveyance timing of the paper 2 by the conveyance roller unit 5 and the discharge roller unit 9, the movement timing of the carriage 12 or the ink discharge timing from the print head 11, the cutting timing of the paper 2 by the cutting unit 8, and the like. can do.
[0039]
  In the present embodiment, a paper transport device is configured by the transport roller unit 5, the suction plate 13 and the suction fan 14 of the inkjet printing unit 6, and the like.
[0040]
  Next, the operation of the ink jet printer 1 according to the present embodiment configured as described above will be described with reference to FIGS.
[0041]
  When the conveyance roller unit 5 that is a pair of driving rollers is driven by the motor 21, the paper 2 is unwound from the winding portion 2 a and is sequentially conveyed onto the suction plate 13 from the front end portion of the paper 2. The paper 2 is transported so that the center position in the width direction coincides with the center position in the width direction of the suction plate 13 (centering with respect to the suction plate 13).
[0042]
  First, the case where the paper 2 having a width corresponding to the areas 71 to 76 in the suction area 52 on the suction plate 13 is conveyed will be described.
[0043]
  When the conveyance roller unit 5 conveys the vicinity of the front end portion of the sheet 2 to the downstream side while being adsorbed by the adsorption holes 15 formed in the area where the areas 71 to 76 and the area 61 overlap. Then, as shown in FIG. 5A, the leading end of the sheet 2 reaches the upstream end of the printing area 51 in the transport direction of the sheet 2.
[0044]
  Further, immediately after the sheet 2 having a width corresponding to the areas 71 to 76 is supplied onto the suction plate 13, when only the vicinity of the front end portion of the sheet 2 is sucked onto the suction plate 13, the suction plate 13 Of the large number of suction holes 15 formed in the first and second suction holes 15, the sheet 2 is blocked by contact with all or a part of the suction holes 15 formed in the region where the regions 71 to 76 and the region 61 overlap. It is. Therefore, many other suction holes 15 are open without being closed.
[0045]
  Here, the aperture ratios of the areas 62 to 65 provided on the downstream side in the conveyance direction of the paper 2 from the area 61 of the suction plate 13 are smaller than the aperture ratio of the area 61. Further, the aperture ratio of the region 77 provided on the outer side in the width direction of the suction plate 13 than the regions 71 to 76 of the suction plate 13 is smaller than the respective aperture ratios of the regions 71 to 76.
[0046]
  Therefore, the sum of the opening areas of all or part of the suction holes 15 formed in the region where the regions 71 to 76 and the region 61 overlap with respect to the sum of the opening areas of all the suction holes 15 formed in the suction region 52. The ratio of is rarely extremely small. Therefore, the negative pressure for adsorbing the paper 2 in the suction holes 15 formed in the area where the areas 71 to 76 and the area 61 overlap is suppressed from becoming extremely small. It can be adsorbed on the adsorption plate 13 with a sufficient negative pressure.
[0047]
  Subsequently, the sheet 71 is conveyed to the downstream side while being adsorbed by the adsorption holes 15 formed in the area where the areas 71 to 76 and the areas 61 to 63 overlap with each other, and as shown in FIG. Reaches the downstream end of the printing area 51 in the transport direction of the sheet 2. Then, the conveyance of the sheet 2 by the conveyance roller unit 5 is stopped.
[0048]
  Then, in a state where the vicinity of the front end of the paper 2 is stopped at a position facing the printing area 51, the print head 11 ejects ink onto the paper 2 while moving in a direction perpendicular to the conveyance direction of the paper 2. The image is printed. Note that the print head 11 may be moved during printing of an image only from one end of the paper 2 to the other end, or after the forward movement, the print head 11 moves backward from the other end of the paper 2 to one end. May be.
[0049]
  Thereafter, when printing of the image in the vicinity of the front end portion of the sheet 2 is completed, the conveyance of the sheet 2 by the conveyance roller unit 5 is resumed, and the suction holes formed in the areas where the areas 71 to 76 and the areas 61 to 65 overlap. As shown in FIG. 5C, the leading end of the sheet 2 reaches further downstream than the downstream end of the suction region 52 in the conveying direction of the sheet 2 as shown in FIG. To do. Then, the next image is printed on the area upstream of the area of the paper 2 on which the image has been printed first. In this way, a plurality of images are printed on the paper 2 by alternately conveying the paper 2 and printing an image.
[0050]
  Note that the length that the sheet 2 is conveyed each time an image is printed is not necessarily the same as the length of the print head 11, and can be arbitrarily changed. Therefore, after printing is performed while the print head 11 moves forward or backward with respect to the paper 2, the paper 2 is conveyed by a length shorter than the length of the print head 11, and the image is printed first. Printing may be performed on the same area as the other area while the print head 11 moves forward or backward again.
[0051]
  Next, a case where the paper 2 having a width corresponding to the areas 71 to 74 in the suction area 52 on the suction plate 13 is conveyed will be described.
[0052]
  When the vicinity of the front end portion of the sheet 2 is transported onto the suction plate 13 by the transport roller unit 5, it is attracted to the suction holes 15 formed in the region where the regions 71 to 74 and the region 61 overlap and moves downstream. As shown in FIG. 6, the leading end of the sheet 2 reaches the end of the printing area 51 on the upstream side in the conveying direction of the sheet 2.
[0053]
  Further, immediately after the paper 2 having a width corresponding to the regions 71 to 74 is supplied onto the suction plate 13, when only the vicinity of the front end portion of the paper 2 is sucked onto the suction plate 13, the suction plate 13 is used. Of the large number of suction holes 15 formed in this, the sheet 2 is blocked by contact with all or a part of the suction holes 15 formed in the region where the regions 71 to 74 and the region 61 overlap. It is. Therefore, many other suction holes 15 are open without being closed.
[0054]
  Here, as described above, the aperture ratios of the areas 62 to 65 provided on the downstream side in the transport direction of the paper 2 from the area 61 of the suction plate 13 are smaller than the aperture ratio of the area 61. In addition, the aperture ratios of the regions 75 to 77 provided on the outer side in the width direction of the suction plate 13 than the regions 71 to 74 of the suction plate 13 are smaller than the aperture ratios of the regions 71 to 74.
[0055]
  Accordingly, the sum of the opening areas of all or part of the suction holes 15 formed in the region where the regions 71 to 74 and the region 61 overlap with respect to the sum of the opening areas of all the suction holes 15 formed in the suction region 52. The ratio of is rarely extremely small. Therefore, the negative pressure for adsorbing the paper 2 in the suction holes 15 formed in the area where the areas 71 to 74 and the area 61 overlap is suppressed from becoming extremely small. It can be adsorbed on the adsorption plate 13 with a sufficient negative pressure.
[0056]
  Thereafter, while being conveyed to the downstream side while being adsorbed by the suction holes 15 formed in the area where the areas 71 to 74 and the areas 61 to 65 overlap, the conveyance of the sheet 2 and the image A plurality of images are printed on the paper 2 by alternately performing printing.
[0057]
  As described above, according to the ink jet printer 1 of the present embodiment, the sheet 2 starts from the region 53 arranged in the vicinity of the center position in the width direction on the upstream side in the transport direction of the sheet 2 of the suction region 52 of the suction plate 13. The aperture ratio of the region becomes smaller than the aperture ratio of the region 53 as it moves away from the upstream side in the transport direction toward the downstream side and the outside in the width direction of the suction plate 13. That is, the aperture ratio of each of the areas 62 to 65 provided on the downstream side in the conveyance direction of the paper 2 from the area 61 of the suction plate 13 is smaller than the aperture ratio of the area 61. Further, the aperture ratio of the region 77 provided on the outer side in the width direction of the suction plate 13 than the regions 71 to 76 of the suction plate 13 is smaller than the respective aperture ratios of the regions 71 to 76. Therefore, when only the vicinity of the front end portion of the paper 2 having a width corresponding to the areas 71 to 76 smaller than the width of the suction plate 13 is sucked onto the suction plate 13, the vicinity of the front end portion of the paper 2 comes into contact. It is possible to suppress the negative pressure in the suction hole 15 closed by the pressure from becoming extremely small. Therefore, the vicinity of the front end portion of the sheet 2 is reliably sucked onto the suction plate 13 by the suction hole 15.
[0058]
  As a result, regardless of the position of the leading edge of the paper 2 relative to the suction plate 13 and the width of the paper 2, the paper 2 can be transported while being reliably suctioned to the suction plate 13. Therefore, the deterioration of the image printed on the paper 2 due to the fact that the flatness of the recording surface of the paper 2 is not ensured is suppressed, and the occurrence of clogging of the paper 2 is suppressed. Further, the suction fan 14 does not have to be made larger than necessary. Therefore, it is possible to prevent an increase in size and cost of the printer, and it is not necessary to perform complicated control on the suction fan 14.
[0059]
  In addition, the size of each suction hole 15 in the suction region 52 gradually decreases as the distance from the region 53 increases. Therefore, the aperture ratio of each of the regions 61 to 65 is the largest in the region 61, gradually decreases in the order of the regions 62 to 64, the aperture ratio of the region 65 is the smallest, and each of the regions 72 to 77 The aperture ratio of the region 72 is the largest, and gradually decreases in the order of the regions 73 to 76, and the aperture ratio of the region 77 is the smallest. Therefore, when only the vicinity of the front end portion of the paper 2 having a width smaller than the width of the suction plate 13 is sucked onto the suction plate 13, the suction hole 15 that is blocked by contact with the vicinity of the front end portion of the paper 2. It is possible to effectively suppress the negative pressure from becoming extremely small. Therefore, the vicinity of the front end of the sheet 2 is reliably adsorbed on the adsorption plate 13 by the adsorption hole 15.
[0060]
  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims. Is. For example, in the above-described embodiment, the case where 65 circular suction holes 15 are formed in a staggered pattern in the suction plate 13 is described. However, the present invention is not limited to this, and suction holes formed in the suction plate. The number, size (opening area per piece), shape and arrangement can be arbitrarily changed. Accordingly, a single suction hole having a shape such that the opening area decreases from the upstream side to the downstream side in the conveyance direction of the paper may be formed on the suction plate, or a plurality of suctions having a shape such as a large number of squares. Holes may be formed, and a large number of suction holes may be arranged so as to form rows in both the vertical direction and the horizontal direction.
[0061]
  Moreover, although the above-mentioned embodiment demonstrated the case where many adsorption | suction holes 15 were formed in the adsorption | suction area | region 52 of the range larger than the printing area | region 51, it is not restricted to this, It exists in a printing | printed_area. Only a large number of adsorption holes may be formed. That is, in this case, the print area and the suction area coincide with each other.
[0062]
  Further, in the above-described embodiment, the areas 62 to 65 are provided which are smaller in the aperture ratio than the area 61 and are arranged downstream of the area 61 in the conveyance direction of the paper 2 and have an aperture ratio higher than that in the area 72. Although the case where the regions 73 to 77 that are small and disposed outside in the width direction with respect to the region 72 are provided has been described,TerritoryIt is only necessary to provide the regions 73 to 77 having an aperture ratio smaller than that of the region 72 and disposed outside the region 72 in the width direction. That is, a region having a relatively large aperture ratio in which at least one suction hole is formed in the suction region 52, and an aperture ratio in which at least one suction hole is formed is smaller than the above region, and the sheet is smaller than the above region. Of the region disposed downstream in the transport direction and the region in which the aperture ratio in which at least one suction hole is formed is smaller than the region and perpendicular to the sheet transport direction with respect to the region. It is sufficient that at least one of them is provided.
[0063]
  In the above-described embodiment, the case where printing is performed on the long sheet 2 is described. However, the present invention is not limited to this, and the sheet is sucked regardless of the width of the sheet in the present embodiment. The effect of being able to convey while reliably adsorbing can also be obtained when printing is performed on a cut sheet having a predetermined length.
[0064]
  Further, in the above-described embodiment, the size of each suction hole 15 in the suction region 52 gradually decreases as the distance from the vicinity of the upstream end of the suction region 52 in the transport direction of the paper 2 increases. Are formed, that is, the respective aperture ratios of the areas 61 to 65 gradually decrease from the upstream side to the downstream side in the conveyance direction of the paper 2. It suffices that at least one region having an aperture ratio smaller than the aperture ratio of the region in the vicinity of the upstream end of the sheet is arranged on the downstream side in the sheet transport direction from the vicinity of the upstream end of the suction region. Accordingly, in the present embodiment, the aperture ratios of the areas 61 and 62 are the same, and the aperture ratios of the areas 63 to 65 are the same, and the areas 63 to 63 arranged on the downstream side in the sheet transport direction. Each aperture ratio of 65 may be smaller than each aperture ratio of the regions 61 and 62. That is, the aperture ratio of each of the regions 61 to 65 does not necessarily need to be reduced in five steps from the upstream side to the downstream side in the conveyance direction of the paper 2 and may be reduced in two steps as described above. , It may be reduced at any of a plurality of stages, or may be reduced steplessly.
[0065]
  Further, in the above-described embodiment, the size of each suction hole 15 in the suction region 52 gradually decreases as the distance from the vicinity of the center position in the width direction increases in the width direction of the suction plate 13. Although the case where the respective aperture ratios of the regions 72 to 77 are gradually decreased from the center position in the width direction of the suction plate 13 toward the outside is described. It suffices that at least one region having an aperture ratio smaller than the aperture ratio of the region in the vicinity of the direction center position is arranged on the outer side in the width direction than in the vicinity of the center position in the width direction of the suction plate. Therefore, in this embodiment, each of the areas 71 to 74 has the same aperture ratio, and each of the areas 75 to 77 has the same aperture ratio, and the areas 75 to 75 disposed on the outer side in the width direction of the suction plate. Each aperture ratio of 77 may be smaller than each aperture ratio of the regions 71 to 74. That is, the aperture ratio of each of the regions 72 to 77 does not necessarily have to be decreased in six steps from the center position in the width direction of the suction plate toward the outer side in the width direction, and may be decreased in two steps as described above. , It may be reduced at any of a plurality of stages, or may be reduced steplessly.
[0066]
  In the above-described embodiment, the case where the sheet 2 is conveyed so that the center position in the width direction coincides with the center position in the width direction of the suction plate 13 is described. The position in the width direction of the conveyed sheet can be arbitrarily changed. Accordingly, for example, the suction plate may be transported so that one end in the width direction of the suction plate and one end in the width direction of the paper coincide. In this case, the suction plate is formed with a large number of suction holes so that the aperture ratio in the region near the one end in the width direction is the largest and the aperture ratio in the region near the other end in the width direction is small. It is preferable.
[0067]
  In the above-described embodiment, the ink jet printer 1 provided with the paper conveyance device for conveying the paper 2 has been described. However, the present invention is not limited to this, and the image forming apparatus provided with the recording medium conveyance device. Anything may be used. Therefore, it may be a photographic processing apparatus provided with a photographic paper transport device. Further, as the print medium in the ink jet printer 1 according to the present embodiment, a thin plastic can be used in addition to the paper.
[0068]
【The invention's effect】
  As explained above, according to claim 1,The first area is arranged in a direction perpendicular to the conveyance direction of the recording medium.Since the aperture ratio of the second region is smaller than the aperture ratio of the first region,Recording medium having a width smaller than the width of the auxiliary memberIs adsorbed on the auxiliary member by the opening formed in the first region, it is possible to suppress the negative pressure in the opening formed in the first region from becoming extremely small. Therefore, the recording mediumBodyThe opening formed in the first region is surely adsorbed on the auxiliary member. ThisRegardless of the width of the recording mediumThe recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore, the deterioration of the image recorded on the recording medium due to the fact that the flatness of the recording surface of the recording medium is not ensured is suppressed, and the occurrence of clogging of the recording medium is suppressed. Further, the suction fan does not need to be made larger than necessary, and complicated control for the suction fan is eliminated.
[0069]
  According to claim 2, the second area arranged in a direction perpendicular to the conveyance direction of the recording medium in the first area.And a third area disposed downstream of the first area in the conveyance direction of the recording mediumWhen the recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by the opening formed in the first area.When only the vicinity of the front end of the recording medium is adsorbed on the auxiliary member by the opening formed in the first areaThus, it is possible to suppress the negative pressure at the opening formed in the first region from becoming extremely small. Therefore, the recording medium is reliably adsorbed on the auxiliary member by the opening formed in the first region. As a result, the width of the recording mediumAnd the tip position of the recording medium with respect to the auxiliary memberRegardless, the recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore, the deterioration of the image recorded on the recording medium due to the fact that the flatness of the recording surface of the recording medium is not ensured is suppressed, and the occurrence of clogging of the recording medium is suppressed. Further, the suction fan does not need to be made larger than necessary, and complicated control for the suction fan is eliminated.
  According to the third aspect, when the recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by the opening formed in the first region, and / or only the front end portion of the recording medium is the first. In the case of being adsorbed on the auxiliary member by the opening formed in the region, it is possible to effectively suppress the negative pressure in the opening formed in the first region from becoming extremely small. Therefore, the recording medium is more reliably adsorbed on the auxiliary member by the opening formed in the first region.
[0070]
  Claim4according to,A second area arranged in a direction perpendicular to the conveyance direction of the recording medium in the first area;Downstream of the recording medium in the transport direction from the first area3rd area arranged inIs smaller than the aperture ratio of the first region,ContractSimilar to claim 2,Width of the recording medium andThe leading edge position of the recording medium relative to the auxiliary memberIn placeRegardless, the recording medium can be conveyed while being reliably adsorbed to the auxiliary member. Therefore,ContractThe same effect as in Claim 2 can be obtained.
[0071]
  Claim5according to,When a recording medium having a width smaller than the width of the auxiliary member is adsorbed on the auxiliary member by an opening formed in the first region and / orWhen only the front end of the recording medium is adsorbed on the auxiliary member by the opening formed in the first areaTogetherIn this case, it is possible to effectively suppress the negative pressure at the opening formed in the first region from becoming extremely small. Therefore, the recording medium is more reliably adsorbed on the auxiliary member by the opening formed in the first region.
[0072]
  Claim6According to this, since the flatness of the recording surface of the recording medium conveyed while being opposed to the image recording unit by the recording medium conveying device is ensured, a high-quality image can be recorded on the recording medium. Further, the increase in the size and the cost of the printer can be suppressed by suppressing the increase in the size of the recording medium conveyance device.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of an ink jet printer provided with a sheet conveying device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a schematic configuration in the vicinity of a suction plate included in the ink jet printer of FIG. 1;
FIG. 3 is a diagram illustrating a schematic configuration of a plurality of areas formed in the suction area along the paper conveyance direction.
FIG. 4 is a diagram showing a schematic configuration of a plurality of areas formed in the suction area along the width direction of the suction plate.
FIG. 5 is a diagram for explaining the operation of the ink jet printer shown in FIG. 1;
6 is a diagram showing a schematic configuration in the vicinity of a suction plate included in the ink jet printer shown in FIG. 1;
[Explanation of symbols]
1 Inkjet printer (image recording device)
2 sheets (recording medium)
6 Inkjet printing unit
5 Conveying roller unit (conveying means)
11 print head (image recording unit)
13 suction plate (auxiliary member)
14 Adsorption fan (adsorption means)
15, 15a Adsorption hole (opening)
51 print area
52 adsorption area (recording area)
53 areas (first area)
61 areas (first area)
62-65 area (first3Area)
72 areas (first area)
73 to 77 region (second region)

Claims (6)

  1. Conveying means for conveying the recording medium;
    The height is substantially the same as the conveyance surface of the recording medium disposed opposite to the image recording unit for recording an image on the recording medium conveyed by the conveyance unit, and substantially the same as the image recording unit. An auxiliary member having at least one opening formed in the opposing recording area;
    Adsorbing means for adsorbing the recording medium to the surface of the auxiliary member through the opening of the auxiliary member;
    In the recording area,
    A first region including a portion in the vicinity of a reference position in the width direction of the recording medium on the auxiliary member;
    A second area having an aperture ratio, which is a total opening area by the openings per unit area, smaller than that of the first area and perpendicular to the conveyance direction of the recording medium with respect to the first area; Is provided. A recording medium conveying apparatus, comprising:
  2. Conveying means for conveying the recording medium;
    The height is substantially the same as the conveyance surface of the recording medium disposed opposite to the image recording unit for recording an image on the recording medium conveyed by the conveyance unit, and substantially the same as the image recording unit. An auxiliary member having at least one opening formed in the opposing recording area;
    Adsorbing means for adsorbing the recording medium to the surface of the auxiliary member through the opening of the auxiliary member;
    In the recording area,
    A first area including a portion of the recording area closest to the upstream side in the conveyance direction of the recording medium and including a portion of the auxiliary member near the reference position in the width direction of the recording medium ;
    A second area having an aperture ratio, which is a total opening area by the openings per unit area, smaller than that of the first area and perpendicular to the conveyance direction of the recording medium with respect to the first area; ,
    A recording medium conveyance, wherein the aperture ratio is smaller than that of the first area, and a third area disposed downstream of the first area in the conveyance direction of the recording medium is provided. apparatus.
  3. The plurality of second regions and a plurality of third regions are provided so that the aperture ratio gradually decreases as the distance from the first region increases. The recording medium conveying apparatus according to the description.
  4. And conveying means for conveying the record medium,
    The height is substantially the same as the conveyance surface of the recording medium disposed opposite to the image recording unit for recording an image on the recording medium conveyed by the conveyance unit, and substantially the same as the image recording unit. An auxiliary member having at least one opening formed in the opposing recording area;
    Adsorbing means for adsorbing the recording medium to the surface of the auxiliary member through the opening of the auxiliary member;
    In the recording area,
    The recording saw including a portion in the width direction central position near the conveying direction upstream side of the most recording medium region, and the width direction reference position portions including a first region in the vicinity of the recording medium on the auxiliary member When,
    A second area having an aperture ratio, which is a total opening area by the openings per unit area, smaller than that of the first area and perpendicular to the conveyance direction of the recording medium with respect to the first area; ,
    A recording medium conveyance, wherein the aperture ratio is smaller than that of the first area, and a third area disposed downstream of the first area in the conveyance direction of the recording medium is provided. apparatus.
  5. 5. The recording medium conveyance device according to claim 4 , wherein the plurality of second regions are provided such that the aperture ratio gradually decreases as the distance from the first region increases. 6.
  6. An image recording apparatus provided with a recording medium conveying apparatus according to any one of claims 1-5.
JP2002016501A 2002-01-25 2002-01-25 Recording medium conveying device and image recording device having the same Expired - Fee Related JP3864791B2 (en)

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JP4500227B2 (en) * 2005-07-22 2010-07-14 オリンパス株式会社 Paper transport mechanism
JP5239827B2 (en) * 2008-03-25 2013-07-17 セイコーエプソン株式会社 Recording device
JP5125678B2 (en) * 2008-03-27 2013-01-23 セイコーエプソン株式会社 Recording device
JP5152980B2 (en) 2008-05-27 2013-02-27 富士フイルム株式会社 Inkjet recording apparatus and method
JP5219723B2 (en) * 2008-10-07 2013-06-26 キヤノン株式会社 Image forming apparatus
KR100994504B1 (en) 2009-02-10 2010-11-15 엘아이지에이디피 주식회사 Removing apparatus for release film of polarizer transfer
US8534826B2 (en) 2010-02-22 2013-09-17 Fujifilm Corporation Inkjet recording apparatus and method
JP2012061789A (en) 2010-09-17 2012-03-29 Seiko Epson Corp Recording apparatus
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US8382275B2 (en) 2010-02-23 2013-02-26 Seiko Epson Corporation Printer
JP2016010963A (en) * 2014-06-03 2016-01-21 株式会社リコー Image formation device

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