JP2007144857A - Inkjet recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrier device having high accurate carrying accuracy while preventing the uplift of a sheet material in a printing area even when the sheet material is expanded when being printed directly under a printing head in a full multiprinter in which a plurality of recording heads are fixedly arranged. <P>SOLUTION: A first carrying means is arranged in the upstream side in a paper carrying direction of the recording head in order to carry out high accuracy paper carrying while preventing the uplift of paper in the printing area directly under the recording head in the rolled paper full multiprinter and a second carrying means holding with a carrying belt and a spur in the printing area, the paper is carried in a paper carrying accuracy of the first carrying means while carrying the same in a state in which the paper is tensioned by slipping the paper and the belt in belt carrying by making the relation between the speed and the carrying force V1<V2 and F1>F2 wherein the carrying speed and carrying force of the first carrying means and the second carrying means are V1, F1 in the first carrying means and V2, F1 in the second carrying means respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording apparatus having functions such as a printer, a copying machine, a facsimile, or the like, or a recording apparatus used as a composite electronic apparatus including a computer, a word processor, or the like, or an output apparatus of a workstation, and in particular, a colored liquid (ink). The present invention relates to a recording unit that performs recording by being applied to a recording material that is a sheet material, and a conveying unit that performs high-precision conveyance in a recording area of the recording unit.

  Recording devices having functions such as printers, copiers, facsimiles, etc., or composite electronic devices including computers and word processors, and recording devices used as output devices for workstations, are based on image information such as paper and plastic thin plates. An image is recorded on a recording material (recording sheet). Such a recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type, and the like according to the recording method.

  In a serial type recording apparatus that employs a serial scanning method in which main scanning is performed in a direction that intersects the conveyance direction (sub-scanning direction) of a recording material, an image is recorded by recording means mounted on a carriage that moves along the recording material. Is recorded (main scanning), and after the recording for one line is completed, a predetermined amount of paper is fed (pitch transport), and then the next line image is recorded on the recording material that has been stopped again (main scanning). The entire recording material is recorded by repeating the operation of scanning.

  On the other hand, in a line-type recording apparatus that records only by sub-scanning in the conveyance direction of the recording material, the recording material is set at a predetermined recording position, and after recording for one line at a time, a predetermined amount The entire recording material is recorded by repeating the operation of feeding the paper (pitch transport) and recording the next line all at once.

  Among the recording apparatuses described above, an ink jet recording apparatus (ink jet recording apparatus) performs recording by discharging ink from a recording means (recording head) onto a recording material, and the recording means can be easily made compact. Yes, high-definition images can be recorded at high speed. In addition, it is possible to record on plain paper without requiring special processing, low running costs, low noise due to the non-impact method, and recording color images using multi-colored inks. Has advantages such as being easy. In particular, a line type apparatus using a line type recording means in which a large number of ejection openings are arranged in the paper width direction can further increase the recording speed.

  5 to 7 are schematic cross-sectional views showing the structure around the recording area in the conventional ink jet recording apparatus. As shown in FIG. 5, the recording sheet P fed by a paper feeding device (not shown) is sandwiched between a conveying roller 101 and a pinch roller 102, and the recording head is supported by a platen 106 on the non-recording surface side. 103 is conveyed to the recording area. The recording head 103 ejects ink toward the recording sheet P and records an image on the recording sheet P. After recording by the recording head 103, the recording sheet P is sandwiched between a discharge roller 104 and a spur 105 provided on the downstream side in the transport direction, and discharged by rotation of the discharge roller 104 and the spur 105.

  Let L be the distance between the recording head 103 and the recording sheet P. In such an ink jet recording apparatus, the ink landing position slightly changes depending on the distance between the recording head 103 and the recording sheet P. Therefore, if the distance is kept at a predetermined distance (for example, L) over the entire recording area, that is, if the recording sheet P can be completely aligned with the platen 106, a high-quality image can be obtained. Therefore, in the conventional ink jet recording apparatus, the recording sheet P is placed along the platen 106 disposed on the lower side of the recording head 103, so that the rotation shaft of the pinch roller 102 and the rotation shaft of the spur 105 are the rotation of the transport roller 101. The shaft and the rotating shaft of the paper discharge roller 104 are often offset from the platen 106 side.

  Further, since ink is used for recording in the ink jet recording apparatus, when the ink soaks into the recording sheet P, the recording sheet P expands, and the recording surface of the recording sheet P causes undulation (cockling) in the recording area. When the recording sheet P is greatly lifted from the platen 106 due to this undulation, not only the landing position of the ink is shifted, but also the recording surface becomes dirty due to the recording head 103 rubbing against the recording sheet P, or the recording head 103 May collide with the end of the recording sheet P and the recording head 103 may be deteriorated or damaged.

Therefore, as shown in FIG. 6, in the conventional ink jet recording apparatus, relief portions 106 ′ and 104 ′ in which the recording sheet P can be displaced downward are provided on the platen 106 and the discharge roller 104, and the recording sheet P is placed on the platen 106 and A pushing spur 107 for forcibly pushing into the escape portions 106 ′ and 104 ′ of the paper discharge roller 104 is provided. By doing so, the recording sheet P regularly undulates within a predetermined height range, and the recording sheet P is prevented from being lifted.
For example, Patent Document 1, Patent Document 2, and Patent Document 3 can be cited as conventional examples.
JP-A-10-67148 JP 2003-306260 A JP 2001-54942 A

  However, in the full multi-printer form in which the nozzle length of the recording head as shown in FIG. Since there are multiple lines, the printing area directly under the recording head is wide, so the conveyance device configuration using the conveyance roller and paper discharge roller (spur) in the form of the serial printer prevents the sheet material from lifting due to printing in the printing area. Difficult to do.

  Therefore, the present invention is a full multi-printer in which a plurality of recording heads are fixedly arranged, while printing is performed immediately below the recording head and the sheet material is elongated, while preventing the sheet material from floating in the printing area. An object of the present invention is to provide a transport apparatus having a highly accurate transport system.

(1) In a conveying apparatus of a recording apparatus that records on a sheet material by a recording means
The transfer device
First conveying means for conveying the sheet material to a recording area of the recording means arranged on the upstream side in the conveying direction;
A conveying belt directly below the recording means and a second conveying means configured to convey and convey the sheet material with the conveying belt by being driven and rotated by the conveying belt;
The relationship between the transport speeds (V1, V2) and the transport clamping forces (F1, F2) of the first transport means and the second transport means is V1 <V2, F1> F2, and the first transport means A sheet material directly under the head is conveyed at a conveyance speed with high accuracy.

  (2) A recording apparatus configuration that performs printing while conveying a sheet material immediately below a plurality of long recording heads each having a nozzle row length corresponding to the width of the sheet material according to the first aspect. It is characterized by.

  (3) The spurs of the second conveying means according to claims 1 and 2 are arranged between a plurality of recording heads.

  (4) The sheet material of the conveying device according to any one of claims 1 to 3 is a roll paper continuously connected in the conveying direction.

  As described above, according to the present invention, it is possible to provide a transport apparatus with high transport accuracy while preventing paper floating in the print region.

  Embodiments relating to the recording apparatus of the present invention will be described below in detail with reference to the drawings.

  A schematic diagram of a recording apparatus embodying the present invention is shown in FIG.

  The recording apparatus 100 according to the present embodiment is of a type called a roll paper printer that performs recording on a long recording medium.

  The recording medium (paper) 112 includes a label paper in which a label piece is temporarily attached to a mount, a tag paper with a perforation in a thick paper, and the like. Supplied to the paper transport unit.

  The transport unit is mainly composed of a transport motor 110 and a transport belt 111, and transports the paper in the direction of the arrow in the figure during the recording operation.

  Here, the roll unit 101 side on the conveyance path is a conveyance inlet, and the opposite side is a conveyance outlet.

  The recording unit of the recording apparatus 100 includes, for example, black (K), cyan (C), magenta (M), and yellow (Y) recording heads 102 to 105.

  Each recording head is an ink-jet line head having nozzle rows corresponding to the paper width.

  Black (K), cyan (C), magenta (M), and yellow (Y) inks are selectively ejected from these four recording heads 102 to 105, respectively, to perform color recording.

  The ejected ink is supplied from the ink cartridges (K) 106, (C) 108, (M) 109, and the ink cartridge (Y) 109 to the corresponding recording heads by a pump and tubes (not shown).

  The roll unit 101 includes a roll drive shaft 113 on which the roll paper 112 is mounted, a roll sensor lever 114 whose position changes due to the slack of the roll paper feeding portion, a roll motor (not shown) that drives the roll drive shaft 113, and the roll sensor lever 114. The roll motor (not shown) is driven and controlled according to the position to adjust the feeding speed of the roll paper 112.

  2 and 3 show a detailed cross-sectional view and a top view, respectively, of the conveying device for the printing area of this embodiment.

  The conveyance belt 111 is tensioned by the conveyance driving roller 117 and the conveyance driven roller 118, and the conveyance belt itself is rotated by the rotation of the conveyance driving roller by the driving source of the conveyance motor.

  The conveyor belt preferably has a certain level of frictional force with the surface of the conveyance drive roller, and further with a frictional force with the back surface of the recording paper, and is formed of a synthetic rubber such as an elastomer and has a seamless endless belt shape. Is made. Such a conveyor belt 111 is disposed immediately below a wide printing area where the line heads 102, 103, 104, and 105 are disposed. Further, one or more spurs are arranged at positions between the heads of the line heads 102, 103, 104, and 105 at positions opposed to the transport belt, and the plurality of spurs are urged to the transport belt by spur springs (not shown), and printing is performed. The recording paper in the area is conveyed by the holding force between the conveying belt and the spur.

  FIG. 4 shows a spur 115 built in the transport device and a spur spring that presses the spur against the transport belt. The spur 115 must transport the recording paper immediately after printing by the recording head in the printing area while pressing the paper float. However, depending on the spur shape, it may be necessary to press the printing surface of unfixed recording paper immediately after printing. The fixing ink on the recording paper is transferred to the surface, and the recording paper is soiled by the ink on the spur. Therefore, it is necessary to use a roller shape and material that are difficult to transfer to the spur surface even if it contacts the unfixed recording paper. As a configuration satisfying the spur conditions, for example, as shown in FIG. 4, the spur roller tip is made of a star-shaped roller with the tip of the roller sharpened with stainless steel to reduce the surface area in contact with the recording paper surface. Thus, it is possible to prevent transfer of unfixed ink to the spur.

  For example, as shown in FIGS. 2 and 3, one or more spurs as described above are provided between the line heads 102, 103, 104, and 105 (three are arranged in FIG. 3), and further, the spur springs are provided with springs on the conveyor belt side. The pinching force generated by the biasing can prevent paper floating in a wide print area of the full multi-printer having this configuration.

  A registration roller pair 113 for transporting the recording paper fed from the roll unit to the transport belt is disposed upstream of the transport belt unit in the paper transport direction.

  In the transport apparatus having such a configuration, in order to transport the roll paper continuously, high-quality printing is required unless the roll paper is accurately transported directly under the head, which is the print area. Furthermore, it is necessary to prevent paper floating due to cockling or the like in a wide printing area directly under the head.

In order to satisfy the above conditions, in this embodiment, the conveyance speed (V1) by the registration roller and the conveyance force (F1) by the spring bias of the registration roller pair, and further the conveyance speed (V2) of the conveyance belt and the spur. V1 <V2 and F1> F2 in relation to the conveyance force (F2) due to the clamping force between
The conditions were as follows. By setting such a conveyance condition, the conveyance force of the registration roller 113 is made larger than the conveyance force of the conveyance belt, so that the conveyance speed of the recording paper in the printing area immediately below the head in FIG. The conveyance speed V1 of the roller becomes dominant, and the conveyance speed V2 (> V1) of the conveyance belt causes the recording paper to be conveyed while being pulled downstream while causing slippage between the recording paper and the conveyance belt.

  As described above, according to the conveyance conditions of the present embodiment, a wide print area of the full multi-printer is fast at a speed higher than the conveyance speed of the upstream registration roller while holding the recording paper with a weak force by a spur and a conveyance belt. By conveying the sheet while causing slip between the conveying belt and the recording sheet, it is possible to provide a conveying apparatus with high accuracy while preventing paper floating in the printing area.

1 is a cross-sectional view of an ink jet printer main body according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the conveyance device of the inkjet printer according to the embodiment of the present invention. FIG. 3 is a top view of the conveyance device of the ink jet printer according to the embodiment of the present invention. The perspective view which shows the spur and spur spring in the conveying apparatus concerning the Example of this invention. It is a schematic sectional drawing which shows the structure of the periphery of the recording area in the conventional inkjet recording device. FIG. 10 is a schematic cross-sectional view of the recording area of a conventional recording apparatus when viewed from the conveyance direction. FIG. 3 is a cross-sectional view of the main configuration of the full multi-printer.

Explanation of symbols

101 Recording device 101 Roll unit (paper feeding)
102 Recording head (K)
103 Recording head (C)
104 Recording head (M)
105 Recording head (Y)
106 Ink cartridge (K)
107 Ink cartridge (C)
108 Ink cartridge (M)
109 Ink cartridge (Y)
DESCRIPTION OF SYMBOLS 110 Conveyance motor 111 Conveyance belt 112 Recording medium 113 Registration roller pair 114 Registration motor 115 Spur 116 Spur spring 117 Conveyance drive roller

Claims (4)

In the conveying device of the recording apparatus that records on the sheet material by the recording means,
The transfer device
First conveying means for conveying the sheet material to a recording area of the recording means arranged on the upstream side in the conveying direction;
A conveying belt directly below the recording means and a second conveying means configured to convey and convey the sheet material with the conveying belt by being driven and rotated by the conveying belt;
The relationship between the transport speeds (V1, V2) and the transport clamping forces (F1, F2) of the first transport means and the second transport means is V1 <V2, F1> F2, and the first transport means A transport apparatus that transports a sheet material directly under a head at a transport speed with high accuracy.   2. A recording apparatus configured to perform printing while transporting a sheet material immediately below a plurality of long recording heads having a nozzle row length corresponding to the width of the sheet material according to claim 1. Conveying device to do.   The spur of the said 2nd conveyance means of Claim 1, 2 is arrange | positioned between several recording heads, The conveying apparatus characterized by the above-mentioned.   The conveying apparatus according to claim 1, wherein the sheet material of the conveying apparatus is roll paper continuously connected in the conveying direction.

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