JP2005343637A - Transport device and recording apparatus - Google Patents

Transport device and recording apparatus Download PDF

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JP2005343637A
JP2005343637A JP2004165804A JP2004165804A JP2005343637A JP 2005343637 A JP2005343637 A JP 2005343637A JP 2004165804 A JP2004165804 A JP 2004165804A JP 2004165804 A JP2004165804 A JP 2004165804A JP 2005343637 A JP2005343637 A JP 2005343637A
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recording
recording medium
conveying
electrode group
potential difference
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JP4464201B2 (en
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Sumitoshi Saotome
純俊 早乙女
Sunao Matsumoto
直 松本
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Canon Inc
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Canon Inc
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Priority to US11/143,174 priority patent/US7396123B2/en
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  • Handling Of Cut Paper (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To surely suck a recording medium to a transport belt 31 even if the moisture content of the recording medium increases in both-sided recording. <P>SOLUTION: This transport device has a transport belt 31 and a both-sided transport part 6 for turning over the recording medium transported with a first surface taken as the obverse by the transport belt 31 and again supplying the recording medium to the transport belt 31 to be transported with a second surface taken as the obverse. The transport device has a page memory 104 storing the recording amount to the recording medium, and on the basis of the recording amount stored in the page memory 104, the applied voltage to the transport belt 31 is varied so that the potential difference between the transport belt 31 and the recording medium in the case of transporting the recording medium with the second surface taken as the obverse is larger than the potential difference between the transport belt 31 and the recording medium in the case of transporting the recording medium with the first surface taken as the obverse. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、搬送ベルトに記録媒体を吸着搬送する搬送装置及び該搬送装置により搬送される記録媒体に対して記録を行う記録装置に関する。   The present invention relates to a conveying apparatus that sucks and conveys a recording medium onto a conveying belt, and a recording apparatus that performs recording on a recording medium conveyed by the conveying apparatus.

一般にインクジェット記録装置は、記録ヘッドから、搬送手段等により搬送される記録媒体に対してインクを吐出して記録を行うものである。インクジェット記録装置は、記録ヘッドのコンパクト化が容易であり、高精細な画像を高速で記録することができ、ランニングコストが安く、ノンインパクト方式であるため騒音が少なく、しかも、多色のインクを使用してカラー画像を記録するのが容易であるなどの利点を有している。中でも、記録媒体の幅方向に多数の吐出口を配列したラインタイプの記録ヘッドを使用したフルライン型の装置は、記録の一層の高速化が可能である。   In general, an ink jet recording apparatus performs recording by ejecting ink from a recording head to a recording medium conveyed by a conveying unit or the like. Inkjet recording devices can easily make the recording head compact, can record high-definition images at high speed, have low running costs, are non-impact, have low noise, and use multicolor ink. It has an advantage that it is easy to use and record a color image. In particular, a full line type apparatus using a line type recording head in which a large number of ejection openings are arranged in the width direction of the recording medium can further increase the recording speed.

ところが、フルライン型の装置において、ラインタイプの記録ヘッドを記録媒体の搬送方向に多数有する装置は、最も上流側位置の記録ヘッドから最も下流側位置の記録ヘッドまでの距離が長くなる。このため、記録領域において記録媒体の含水量が上がると、記録媒体に浮き上がり生じ、記録ヘッドから吐出されたインクが記録媒体の所望の位置に着弾せず、これが記録品位に影響を与えることも考えられる。この影響を防止するため、記録媒体が浮き上がらないように、記録媒体を搬送手段へ付勢する必要がある。   However, in a full-line apparatus, an apparatus having a large number of line-type recording heads in the recording medium conveyance direction increases the distance from the recording head at the most upstream position to the recording head at the most downstream position. For this reason, when the water content of the recording medium increases in the recording area, the recording medium is lifted, and the ink ejected from the recording head does not land at a desired position on the recording medium, which may affect the recording quality. It is done. In order to prevent this influence, it is necessary to urge the recording medium to the conveying means so that the recording medium does not float up.

記録媒体を搬送手段へ付勢する手段として搬送手段に電極を設け、該電極に電荷を与えて静電気力を発生させ、記録媒体を前記搬送手段に吸着させる方法が一般的に知られている(例えば、特許文献1参照)。   As a means for urging the recording medium to the conveying means, a method is generally known in which an electrode is provided on the conveying means, an electric charge is applied to the electrode to generate an electrostatic force, and the recording medium is attracted to the conveying means ( For example, see Patent Document 1).

特開2002−284383JP 2002-284383 A

ところで、最近では、記録媒体の片面に対して記録を行うのみならず、記録媒体の両面に記録を行うことが要求されることが多くなってきた。記録媒体の両面に記録を行う場合には、まず、第一面に対して記録ヘッドによるインク吐出を行い、次に第二面に対して記録ヘッドによりインク吐出を行う。この場合、記録媒体の第一面に記録を行うと、記録媒体の含水量が増加するため、記録媒体が片面に対する記録よりも大きく膨潤し、波うち(いわゆるコックリング)が発生することがあり、記録品位に影響を与えることがある。ここで、上記従来技術を両面搬送にしても、当時として望まれる記録品位を十分に満たすことは可能であるが、近年はより高い記録品位が求められるようになってきている。   Recently, there has been an increasing demand for recording not only on one side of a recording medium but also on both sides of the recording medium. When recording on both sides of the recording medium, first, ink is ejected by the recording head on the first surface, and then ink is ejected by the recording head on the second surface. In this case, when recording is performed on the first surface of the recording medium, the water content of the recording medium increases, so that the recording medium swells more than recording on one side and a wave (so-called cockling) may occur. May affect the recording quality. Here, even if the above-mentioned prior art is transported on both sides, it is possible to sufficiently satisfy the recording quality desired at that time, but in recent years higher recording quality has been demanded.

また、搬送部材として搬送ベルトを使用する際に、装置本体に装着した状態で長期間放置すると、搬送ローラ等に当接する曲率の強い部に癖が発生することがある。   In addition, when using a conveyor belt as a conveyor member, if the belt is left for a long period of time while attached to the apparatus main body, wrinkles may occur in a portion having a strong curvature that abuts the conveyor roller or the like.

そこで本発明は、両面記録を行う場合において、記録媒体の含水量が増加しても、搬送部材に記録媒体を確実に吸着することを目的とする。   Therefore, an object of the present invention is to reliably adsorb the recording medium to the conveying member even when the moisture content of the recording medium increases when performing double-sided recording.

前記目的を達成するための本発明に係る代表的な構成は、電極に電圧を印加することで記録媒体を吸着搬送する吸着力発生手段を有する搬送部材と、該搬送部材により第一面を表面にして搬送された記録媒体を裏返して、該記録媒体を再び該搬送部材に供給して第二面を表面にして搬送する両面搬送部と、を有する搬送装置において、前記搬送装置は、前記記録媒体への記録量を記憶する記憶手段を有し、前記記憶手段に記憶された前記記録量に基づいて、第一面を表面にして記録媒体を搬送する場合の前記搬送部材と記録媒体との電位差よりも、第二面を表面にして記録媒体を搬送する場合の前記搬送部材と記録媒体との電位差の方が大きくなるように、前記搬送部材への印加電圧を変化させることを特徴とする。   In order to achieve the above object, a typical configuration according to the present invention includes a conveying member having an attracting force generating means for attracting and conveying a recording medium by applying a voltage to an electrode, and the first surface is surfaced by the conveying member. A double-sided conveyance unit that turns over the recording medium conveyed and supplies the recording medium to the conveyance member again and conveys the second surface as a front surface. Storage means for storing the recording amount on the medium, and based on the recording amount stored in the storage means, between the transport member and the recording medium when transporting the recording medium with the first surface as the surface The applied voltage to the transport member is changed so that the potential difference between the transport member and the recording medium when transporting the recording medium with the second surface as the surface is larger than the potential difference. .

本発明は、第一面を表面にして搬送する場合に比べて、第二面を表面にして搬送する場合の方が、搬送部材と記録媒体との電位差が大きくなるように前記搬送部材への印加電圧を変化させるため、第一面の記録を行った後に記録媒体の含水量が増加していても、第二面の記録を行う際には、搬送部材と記録媒体との電位差が大きくなって、記録媒体の搬送部材に対する吸着力が増加するため、記録媒体を搬送部材に対して確実に吸着することができる。   In the present invention, compared to the case where the first surface is conveyed, the case where the second surface is conveyed and the conveyance member is arranged so that the potential difference between the conveying member and the recording medium becomes larger. In order to change the applied voltage, even if the moisture content of the recording medium increases after recording on the first side, the potential difference between the conveying member and the recording medium increases when recording on the second side. Thus, since the adsorption force of the recording medium to the conveyance member increases, the recording medium can be reliably adsorbed to the conveyance member.

本発明は、上述の如き構成と作用とを有するので、両面記録を行う場合において、記録媒体の含水量が増加していても、搬送ベルトに記録媒体を確実に吸着することが出来る。   Since the present invention has the above-described configuration and operation, even when double-sided recording is performed, the recording medium can be reliably adsorbed to the conveyance belt even if the water content of the recording medium is increased.

以下、図面を参照して、本発明を適用した記録媒体搬送装置の一態様について詳しく説明する。尚、以下の実施例では、インクを吐出して記録を行うインクジェット方式の記録装置に用いられる記録媒体搬送装置を例示している。   Hereinafter, with reference to the drawings, an embodiment of a recording medium transport apparatus to which the present invention is applied will be described in detail. In the following embodiments, a recording medium transport device used in an ink jet recording apparatus that performs recording by discharging ink is illustrated.

本実施例に係る記録媒体搬送装置を備えた記録装置について図面を用いて具体的に説明する。   A recording apparatus provided with a recording medium conveying apparatus according to the present embodiment will be specifically described with reference to the drawings.

まず、記録装置の全体構成を図面に沿って説明する。自動給送装置を有した記録装置は、給送部、搬送ベルト部(搬送手段、搬送装置)、該搬送ベルト部に付帯される両面搬送部、排出部、記録ヘッド部から構成されている。図1は記録装置1の全体構成を示す断面図であり、図1を用いて、給送部2、搬送ベルト部3、両面搬送部6、記録部7、排出部4の説明をする。   First, the overall configuration of the recording apparatus will be described with reference to the drawings. A recording apparatus having an automatic feeding device includes a feeding unit, a conveying belt unit (conveying means, a conveying device), a double-sided conveying unit attached to the conveying belt unit, a discharge unit, and a recording head unit. FIG. 1 is a cross-sectional view showing the overall configuration of the recording apparatus 1. The feeding unit 2, the conveyor belt unit 3, the duplex conveying unit 6, the recording unit 7, and the discharging unit 4 will be described with reference to FIG.

給送部2は、記録媒体としての記録媒体Pを積載する圧板21と、記録媒体Pを給送する給送回転体22がベース20に取り付けられる構成となっている。圧板21はベース20に結合された回転軸aを中心に回転可能で、圧板バネ24により給送回転体22に付勢される。圧板21における給送回転体22と対向する部位には、記録媒体Pの重送を防止する人工皮等の摩擦係数の大きい材質からなる分離パッド25が設けられている。更に、ベース20には、記録媒体Pの一方向の角部を覆い、記録媒体Pを一枚ずつ分離するための分離爪26、圧板21と給送回転体22の当接を解除する不図示のリリースカムが設けられている。   The feeding unit 2 is configured such that a pressure plate 21 on which a recording medium P as a recording medium is stacked and a feeding rotating body 22 that feeds the recording medium P are attached to the base 20. The pressure plate 21 is rotatable about a rotation axis a coupled to the base 20 and is urged by the pressure plate spring 24 to the feeding rotating body 22. A separation pad 25 made of a material having a large coefficient of friction such as an artificial skin for preventing the double feeding of the recording medium P is provided at a portion of the pressure plate 21 facing the feeding rotating body 22. Further, the base 20 covers a corner portion of the recording medium P in one direction, and the separation claw 26 for separating the recording medium P one by one, the pressure plate 21 and the feeding rotating body 22 are released from contact with each other. A release cam is provided.

上記構成において、待機状態ではリリースカムが圧板21を所定位置まで押し下げている。これにより、圧板21と給送回転体22の当接は解除される。そして、この状態で搬送ローラ32の有する駆動力が、ギア等により給送回転体22及びリリースカムに伝達されると、リリースカムが圧板21から離れて該圧板21は上昇し、給送回転体22と記録媒体Pが当接し、給送回転体22の回転に伴い記録媒体Pはピックアップされ、給送を開始する。記録媒体Pは、分離爪26によって一枚ずつ分離され、順次後述の搬送ベルト部3に送られる。給送回転体22は、記録媒体Pを搬送ベルト部3に送り込むまで回転した後、再び記録媒体Pと給送回転体22との当接を解除した待機状態となると、搬送ローラ32からの駆動力が切られる。   In the above configuration, the release cam pushes the pressure plate 21 down to a predetermined position in the standby state. As a result, the contact between the pressure plate 21 and the feeding rotating body 22 is released. In this state, when the driving force of the conveying roller 32 is transmitted to the feed rotating body 22 and the release cam by a gear or the like, the release cam moves away from the pressure plate 21, and the pressure plate 21 rises, and the feed rotating body 22 and the recording medium P come into contact with each other, and the recording medium P is picked up as the feeding rotating body 22 rotates, and feeding is started. The recording media P are separated one by one by the separation claw 26 and are sequentially fed to the conveyance belt unit 3 described later. When the feeding rotator 22 rotates until the recording medium P is fed to the conveyance belt unit 3 and then enters a standby state where the contact between the recording medium P and the feeding rotator 22 is released again, the feeding roller 32 is driven from the conveyance roller 32. Power is cut off.

90は、手差し給送用の給送回転体である。給送回転体90は、コンピュータの記録命令信号に従って回転し、手差しトレイ91上に設置された記録媒体Pを搬送ローラ32の方向へ搬送するものである。   Reference numeral 90 denotes a feeding rotating body for manual feeding. The feeding rotator 90 rotates in accordance with a computer recording command signal and conveys the recording medium P installed on the manual feed tray 91 in the direction of the conveying roller 32.

搬送ベルト部3は記録媒体Pを搬送ベルト(搬送部材)31に吸着して搬送するものである。搬送ベルト部3は、記録媒体Pを搬送する搬送ベルト31と、不図示のPEセンサとを有している。   The conveyor belt unit 3 is configured to attract and convey the recording medium P to a conveyor belt (conveying member) 31. The transport belt unit 3 includes a transport belt 31 that transports the recording medium P and a PE sensor (not shown).

搬送ベルト31には記録媒体を搬送ベルト31に吸着するための吸着力発生手段36を有する。   The conveyance belt 31 has an adsorption force generating means 36 for adsorbing the recording medium to the conveyance belt 31.

搬送ベルト31は、駆動ローラ34によって駆動され、従動ローラである搬送ローラ32及び圧力ローラ35によって巻架されている。尚、搬送ローラ32、駆動ローラ34は、プラテン30に回動可能に取り付けられ、圧力ローラ35は一端がプラテン30に揺動可能に付けられたアーム50の他端に回動可能に付けられ、アーム50がバネ51によって押圧されることで搬送ベルト31に張力(2.0kgf)を付加している。また、プラテン30は搬送ベルト31の下方に位置し、搬送ベルト31の下方への変位を規制する役目をしている。   The conveyor belt 31 is driven by a driving roller 34 and is wound around a conveyor roller 32 and a pressure roller 35 which are driven rollers. The conveying roller 32 and the driving roller 34 are rotatably attached to the platen 30, and the pressure roller 35 is rotatably attached to the other end of the arm 50 that is swingably attached to the platen 30. Tension (2.0 kgf) is applied to the conveyor belt 31 by the arm 50 being pressed by the spring 51. The platen 30 is located below the conveyor belt 31 and serves to regulate the downward displacement of the conveyor belt 31.

搬送ローラ32と対向する位置には、搬送ベルト31と従動するピンチローラ33が当接して設けられている。ピンチローラ33は図示しないバネによって搬送ベルト31に圧接されることで、記録媒体Pを記録ヘッド部へと導く。また、本体フレーム(不図示)と導通することで搬送ベルト31の表面層に蓄積されている電荷を除去している。   A conveying belt 31 and a driven pinch roller 33 are provided in contact with each other at a position facing the conveying roller 32. The pinch roller 33 is brought into pressure contact with the transport belt 31 by a spring (not shown) to guide the recording medium P to the recording head unit. Further, electric charges accumulated in the surface layer of the conveyor belt 31 are removed by conducting with a main body frame (not shown).

更に、記録媒体Pが搬送されてくる搬送ベルト部3の入口には、記録媒体Pをガイドする上ガイド27及び下ガイド28が配設されている。また、上ガイド27には記録媒体Pの先端、後端検出をPEセンサ(不図示)に伝えるPEセンサレバー23が設けられている。更に、搬送ローラ32の記録媒体搬送方向における下流側には、画像情報に基づいて画像を形成する記録部7が設けられている。   Further, an upper guide 27 and a lower guide 28 for guiding the recording medium P are disposed at the entrance of the conveying belt unit 3 to which the recording medium P is conveyed. In addition, the upper guide 27 is provided with a PE sensor lever 23 that transmits detection of the leading and trailing ends of the recording medium P to a PE sensor (not shown). Further, on the downstream side of the conveyance roller 32 in the recording medium conveyance direction, a recording unit 7 that forms an image based on image information is provided.

上記構成において、搬送ベルト部3に送られた記録媒体Pは上ガイド27及び下ガイド28に案内されて、搬送ローラ32とピンチローラ33とのローラ対に送られる。この時、搬送されてきた記録媒体Pの先端をPEセンサレバー23で検知して記録媒体Pの記録位置を求めている。また、記録媒体Pはモータによって搬送ローラ32を介して搬送ベルト31が回転することで搬送される。   In the above configuration, the recording medium P sent to the transport belt unit 3 is guided by the upper guide 27 and the lower guide 28 and sent to the roller pair of the transport roller 32 and the pinch roller 33. At this time, the leading end of the conveyed recording medium P is detected by the PE sensor lever 23 to obtain the recording position of the recording medium P. Further, the recording medium P is conveyed by the rotation of the conveying belt 31 via the conveying roller 32 by the motor.

尚、記録媒体Pを吸着し保持しつつ移動する搬送ベルト31は、約0.1mm〜0.2mm位の厚みのポリエチレン、ポリカーボネートなどの合成樹脂からできており、つなぎ目のない無端ベルト形状を成している。つなぎ目があると印加電圧が該つなぎ目において変化するということも考えられるが、本実施例の搬送ベルト31は無端形状であり、つなぎ目がないため、ベルト上に均一に電圧を印加することができる。   The conveyance belt 31 that moves while adsorbing and holding the recording medium P is made of a synthetic resin such as polyethylene or polycarbonate having a thickness of about 0.1 mm to 0.2 mm, and forms a seamless endless belt shape. doing. Although it is conceivable that the applied voltage changes at the joint when there is a joint, the conveying belt 31 of this embodiment is endless and has no joint, so that the voltage can be uniformly applied on the belt.

搬送ベルト31は、複数の電極板36aを有する第一電極群及び複数のアース板36bを有する第二電極群からなる櫛歯状の電位の異なる電極による吸着力発生手段36、ベース層36c及び表面層36dとで構成されており、互いの層は接着剤もしくは熱溶着等の手段により接合されている。   The conveyor belt 31 is composed of a first electrode group having a plurality of electrode plates 36a and a second electrode group having a plurality of ground plates 36b. The layers 36d are joined together by means such as adhesive or heat welding.

ここで吸着力発生手段36の説明をする。図2に示すように、吸着力発生手段36は導電性の金属から成る同極性、異極性あるいは一方がアースに落とされた電位の異なる電極(電極板36a、アース板36b)を交互に配置して構成され、図に示すようにそれぞれの歯が独立して櫛歯状をし、ベルト搬送方向と直交する方向で向かい合うように搬送ベルト31に複数設置されている。搬送ベルト31の移動方向両側端には、それぞれパターンを露出した被給電部である端子36a'、36b'がベルト移動方向で各電極36a、36bの幅よりも長い距離を有して設けられており、それぞれに所定の圧力で接触する導電性の給電ブラシ52が設けられ、不図示の高圧電源(荷電手段または給電手段)によって電極板36aの端子36a'には正または負の電圧が印加され、アース板36bの端子36b'はアースに落とされている。給電ブラシ52に約0.5kV〜10kVの電圧を印加させることにより各記録ヘッド7下方の記録位置で搬送ベルト31に吸着力を発生させる。尚、給電ブラシ52は所定の高電圧を発生する高圧電源(不図示)に接続されている。   Here, the adsorption force generating means 36 will be described. As shown in FIG. 2, the attracting force generating means 36 is configured by alternately arranging electrodes (electrode plate 36a, ground plate 36b) having the same polarity, different polarity made of conductive metal or different potentials, one of which is grounded. As shown in the drawing, each tooth has a comb-like shape independently, and a plurality of teeth are installed on the conveyance belt 31 so as to face each other in a direction orthogonal to the belt conveyance direction. Terminals 36a ′ and 36b ′, which are power-feeding portions exposing the pattern, are provided at both ends in the moving direction of the conveyor belt 31 so as to have a distance longer than the width of the electrodes 36a and 36b in the belt moving direction. In addition, conductive power supply brushes 52 that are in contact with each other at a predetermined pressure are provided, and a positive or negative voltage is applied to the terminal 36a ′ of the electrode plate 36a by a high voltage power supply (charging means or power supply means) (not shown). The terminal 36b 'of the ground plate 36b is grounded. By applying a voltage of about 0.5 kV to 10 kV to the power supply brush 52, an attracting force is generated on the conveying belt 31 at a recording position below each recording head 7. The power supply brush 52 is connected to a high voltage power source (not shown) that generates a predetermined high voltage.

電極板36aに電圧が与えられると電気力が電極板36aからアース板36bの方向に発生し、電気力線が形成される。そして、電極板36aとアース板36bとの間の電位差により搬送ベルト31の上方位置に吸着力が発生し、記録媒体Pの記録面上には、電極板36aに与えられた電圧と同極性の電荷(表面電位)が発生する。尚、記録媒体Pの吸着力としては、電極板36aとアース板36bとの間の導電金属がない部分が最も低い領域となる。   When a voltage is applied to the electrode plate 36a, an electric force is generated in the direction from the electrode plate 36a to the ground plate 36b, and electric lines of force are formed. Then, an attractive force is generated above the transport belt 31 due to the potential difference between the electrode plate 36a and the ground plate 36b, and the same polarity as the voltage applied to the electrode plate 36a is formed on the recording surface of the recording medium P. Charge (surface potential) is generated. Incidentally, the adsorption force of the recording medium P is the lowest region where there is no conductive metal between the electrode plate 36a and the ground plate 36b.

38はクリーニングローラ対で、ベルト31に挟圧して設けられ、ベルト31に付着したインク等の汚れを除去するためにインクを吸収することが可能で、且つ耐久において劣化を防止するために気孔径の小さい(10μm〜30μmが好ましい)連胞のスポンジで形成されている。搬送ベルト31は、クリーニングローラ対38で清掃された後、除電手段である除電ブラシ37によって除電される。   38 is a pair of cleaning rollers, and is sandwiched between the belt 31. The cleaning roller 38 can absorb ink to remove stains such as ink adhering to the belt 31, and has a pore diameter to prevent deterioration in durability. And is formed of a sponge of a reticulum (preferably 10 μm to 30 μm). The transport belt 31 is cleaned by the cleaning roller pair 38 and then neutralized by a neutralizing brush 37 serving as a neutralizing unit.

両面搬送部6は、搬送ベルト31により第一面を表面に向けて搬送された記録媒体Pを裏返し、第一面の裏面である第二面を表面にして、搬送ベルト31に再び供給するものである。具体的には、両面搬送部6は次のように記録媒体Pを裏返す。まず、片面(第一面)の記録が完了した記録媒体Pを排出側に搬送し、記録媒体Pの後端が排出ローラ41、拍車42のニップ部にきたとき、排出ローラ41を逆転して記録媒体Pを逆搬送する。記録媒体Pは、図1における搬送ベルト部3の下部に配置された両面搬送路61に導き入れられ、両面搬送路61内の複数の送りローラにより搬送された後、再び搬送ローラ32とピンチローラ33との間を通して搬送ベルト上に記録媒体Pを供給する。これにより、記録媒体Pに最初に記録を行った面(第一面)と反対側の面(第二面)を表面とし、記録部7の方に向けることができ、両面の記録が可能になる。尚、両面搬送路61は、複数枚の記録媒体を蓄えることができる。   The double-sided conveyance unit 6 reverses the recording medium P conveyed by the conveyance belt 31 with the first surface facing the front surface, and supplies the recording medium P to the conveyance belt 31 again with the second surface, which is the back surface of the first surface. It is. Specifically, the double-sided conveyance unit 6 turns over the recording medium P as follows. First, the recording medium P on which recording on one side (first side) is completed is conveyed to the discharge side. When the rear end of the recording medium P reaches the nip portion of the discharge roller 41 and the spur 42, the discharge roller 41 is reversed. The recording medium P is reversely conveyed. The recording medium P is introduced into a double-sided conveyance path 61 disposed in the lower part of the conveyance belt unit 3 in FIG. 1 and conveyed by a plurality of feed rollers in the double-sided conveyance path 61, and then again the conveyance roller 32 and the pinch roller. The recording medium P is supplied onto the conveying belt through the space 33. As a result, the surface (first surface) opposite to the surface on which the recording was first performed on the recording medium P (second surface) can be set as the front surface and directed toward the recording unit 7, and recording on both sides is possible. Become. The double-sided conveyance path 61 can store a plurality of recording media.

記録手段としての記録部7は、記録媒体Pの搬送方向と直交する方向に複数のノズルが配列されたラインタイプのインクジェット記録ヘッドが用いられ、記録媒体Pの搬送方向上流側から7K(黒)、7C(シアン)、7M(マゼンタ)、7Y(イエロー)の順に所定間隔で配置され、各記録ヘッド7K、7C、7M、7Yはヘッドホルダ7aに取り付けられている。この記録ヘッドは、ヒータ等によりインクに熱を与えることが可能となっている。そして、この熱によりインクは膜沸騰し、この膜沸騰による気泡の成長又は収縮によって生じる圧力変化によって記録ヘッドのノズルからインクが吐出されて記録媒体P上に画像が形成される。   The recording unit 7 as a recording unit uses a line type ink jet recording head in which a plurality of nozzles are arranged in a direction orthogonal to the conveyance direction of the recording medium P, and is 7K (black) from the upstream side in the conveyance direction of the recording medium P. , 7C (cyan), 7M (magenta), and 7Y (yellow) are arranged at predetermined intervals in this order, and the recording heads 7K, 7C, 7M, and 7Y are attached to the head holder 7a. This recording head can apply heat to the ink by a heater or the like. The heat causes the ink to boil, and the ink is ejected from the nozzles of the recording head by a pressure change caused by the growth or contraction of the bubbles due to the film boiling, so that an image is formed on the recording medium P.

記録部7は、一端が軸71によって回動可能に固定され、他端に形成された突出部7Bとレール72とが係合し、ノズル面と記録媒体Pとの距離(紙間)が規定されるようになっている。   One end of the recording unit 7 is pivotally fixed by a shaft 71, and a projection 7B formed on the other end engages with a rail 72 to define a distance (between paper) between the nozzle surface and the recording medium P. It has come to be.

排出部4は、排出ローラ41と拍車42とによって構成される。記録部7で記録された記録媒体Pは、排出ローラ41と拍車42とに挟まれ搬送されて排出トレイ43に排出される。排出ローラ41は、不図示の伝達手段によって駆動ローラ34の回転力によって駆動される。尚、拍車42とは、記録後の記録面を転走するため、記録媒体との接触面積が小さく、記録後の記録面に接触しても該記録媒体の記録像を乱すことがないように構成した回転体である。   The discharge unit 4 includes a discharge roller 41 and a spur 42. The recording medium P recorded by the recording unit 7 is sandwiched and conveyed between the discharge roller 41 and the spur 42 and is discharged to the discharge tray 43. The discharge roller 41 is driven by the rotational force of the drive roller 34 by a transmission means (not shown). The spur 42 rolls on the recording surface after recording, so that the contact area with the recording medium is small, and even if it contacts the recording surface after recording, the recorded image on the recording medium is not disturbed. It is the comprised rotary body.

次に、図3及び図4を用いて、本実施例に係る搬送ベルト部の構成について更に詳しく説明する。図3は搬送ベルト部全体の構成を示す斜視図、図4はプラテンの説明図である。   Next, the configuration of the transport belt unit according to the present embodiment will be described in more detail with reference to FIGS. 3 and 4. FIG. 3 is a perspective view showing a configuration of the entire conveyance belt unit, and FIG. 4 is an explanatory diagram of a platen.

まずプラテン30について説明する。図3及び図4に示すように、プラテン30には、各記録ヘッド7K、7C、7M、7Yに対向する位置に凸部30aが、ノズル列方向(搬送方向と直交した方向)にノズル面(フェース面)と平行して配置されている。   First, the platen 30 will be described. As shown in FIGS. 3 and 4, the platen 30 has convex portions 30a at positions facing the recording heads 7K, 7C, 7M, and 7Y, and a nozzle surface (direction perpendicular to the transport direction) in the nozzle row direction (direction perpendicular to the transport direction). It is arranged in parallel with the (face surface).

搬送ベルト31に対向する凸部30aの面30bは、予め定められた(ベルト搬送方向の)幅を用いる平面であり、各記録ヘッドのノズル面に対向した凸部30aの面30bは互いに同一平面上に位置している。充分な吸引力を得るために凸部30aは導電性を有する材料からなり、搬送ベルト31と摺動する面30bには、テフロン(登録商標)フィルム又は高分子量ポリエチレンフィルムなどの低摩擦層30c(厚さ:100μm、摩擦係数0.2)が全面に構成されており、搬送時、搬送ベルト31との摩擦の低減と回転時の回転負荷の安定化を行うことにより、搬送精度を確保している。   The surface 30b of the convex portion 30a facing the conveyance belt 31 is a plane using a predetermined width (in the belt conveyance direction), and the surfaces 30b of the convex portions 30a facing the nozzle surface of each recording head are the same plane. Located on the top. In order to obtain a sufficient suction force, the convex portion 30a is made of a conductive material, and a low friction layer 30c (such as a Teflon (registered trademark) film or a high molecular weight polyethylene film) is provided on a surface 30b that slides on the conveyor belt 31. (Thickness: 100 μm, friction coefficient 0.2) is configured on the entire surface, and during transportation, the friction with the conveyor belt 31 is reduced and the rotational load during rotation is stabilized to ensure the conveyance accuracy. Yes.

実際の動作状況において吸引力により搬送ベルトの吸引力残留癖形状と搬送による搬送ベルトのバタツキを押さえる原理について説明する。   A description will be given of the principle of suppressing the suction force residual wrinkle shape of the transport belt and the fluttering of the transport belt due to transport in the actual operation situation.

まず残留癖形状について説明する。上述のように、搬送ベルト31は、吸着力発生手段36(電極板36a、アース板36b)とベース層36cと表面層36dで構成されており、互いの層は接着剤もしくは熱溶着等の手段により接合されているが、材質固有の曲性の違いにより、搬送ベルト部3を記録装置1に装着した状態で長期間放置した場合、搬送ローラ32、駆動ローラ34、圧力ローラ35に当接する曲率の強い部に癖が発生する(クリープ)。この状態で搬送動作を開始すると、搬送ローラ32と駆動ローラ34によって懸架された記録ヘッド部に対向する位置において、搬送ベルト31は圧力ローラ35によって加えられた張力によって搬送方向に引っ張られるが、癖の付いた部分においては癖形状が残っており、約0.5mm〜1.0mm程度の波打ちを発生してしまう。   First, the residual ridge shape will be described. As described above, the conveyor belt 31 is composed of the adsorption force generating means 36 (electrode plate 36a, ground plate 36b), the base layer 36c, and the surface layer 36d, and the layers are means such as an adhesive or heat welding. However, due to the difference in curvature inherent to the material, the curvature of contact with the conveying roller 32, the driving roller 34, and the pressure roller 35 when the conveying belt unit 3 is left attached to the recording apparatus 1 for a long period of time. Wrinkles occur in the strong parts (creep). When the conveyance operation is started in this state, the conveyance belt 31 is pulled in the conveyance direction by the tension applied by the pressure roller 35 at a position facing the recording head unit suspended by the conveyance roller 32 and the driving roller 34. In the part with the mark, the shape of the ridge remains, and a wave of about 0.5 mm to 1.0 mm is generated.

本実施例では、櫛歯電極を設けた搬送ベルトの電極板36aに高電圧(0.5kV〜10kV)を印加することで電気力を発生させ、上面で記録媒体Pを吸着して記録媒体Pのコックリングを防止し、同様に下面でプラテン30の凸部30aに吸引させて搬送ベルト31の波うちを抑制して安定した記録媒体への記録や、搬送ベルト31の搬送を実現させている。   In this embodiment, an electric force is generated by applying a high voltage (0.5 kV to 10 kV) to the electrode plate 36a of the conveyance belt provided with the comb-teeth electrodes, and the recording medium P is adsorbed on the upper surface to record the recording medium P. In the same manner, the convex portion 30a of the platen 30 is attracted by the lower surface to suppress the wobbling of the conveying belt 31 to realize stable recording on the recording medium and conveyance of the conveying belt 31. .

搬送ベルト31の凸部30aに対する吸引力に関しては、モデル化することにより直列接続されたコンデンサと見なすことができるため(図5(b)及び(c)参照)、図5(a)の関係式が成り立っている。このように、搬送ベルト31とプラテン30の間の吸引力は、搬送ベルト31の電極板36aに対する印加電圧が大きければ大きいほど(第一電極群と第二電極群との間の電位差が大きければ大きいほど)強く、搬送ベルト31とプラテン30との距離が大きければ大きいほど弱くなる。   The attraction force with respect to the convex portion 30a of the conveyor belt 31 can be regarded as a capacitor connected in series by modeling (see FIGS. 5B and 5C), and therefore the relational expression of FIG. Is true. As described above, the suction force between the conveyor belt 31 and the platen 30 increases as the applied voltage to the electrode plate 36a of the conveyor belt 31 increases (the potential difference between the first electrode group and the second electrode group increases). The greater the distance, the stronger. The greater the distance between the conveyor belt 31 and the platen 30, the weaker the distance.

一方、両面に記録を行う記録媒体Pを搬送ベルト31に対して吸着する場合、記録媒体Pの第一面を記録する場合と、該第一面の記録が終わった後に両面搬送部6により搬送して第二面を記録する場合には、印加電圧を変える必要があることを発明者は発見した。第二面に対して記録を行う際には、記録媒体Pにインク滴が打ち込まれており、記録媒体Pの水分量(含水量)が変わっており、含水量が増加すると、吸着力が現象するためである。また、条件により環境が変化したとき、特に高湿時には記録媒体P内の水分量が増加しており、片面時でも吸着しづらいこともある。   On the other hand, when the recording medium P for recording on both sides is attracted to the conveyance belt 31, the first side of the recording medium P is recorded, and the recording is performed by the duplex conveying unit 6 after the recording on the first side is finished. Thus, the inventor has found that it is necessary to change the applied voltage when recording the second surface. When recording on the second surface, ink droplets are driven into the recording medium P, the moisture content (moisture content) of the recording medium P changes, and when the moisture content increases, the adsorption force becomes a phenomenon. It is to do. In addition, when the environment changes depending on the conditions, particularly when the humidity is high, the amount of water in the recording medium P increases, and it may be difficult to adsorb even on one side.

図6に示すように、記録媒体Pへの記録量が多くなり、記録媒体Pに打ち込まれるインク滴の打ち込み量が増加すると、それに比例して、インク内の水分により記録媒体Pの含水量が増加する。このように、記録媒体Pの含水量が増加すると、記録媒体Pが搬送ベルト31に吸着しづらくなる。このため、図7に示すように、記録装置1内の制御部100にインク滴の打ち込み量(記録量)を算出するドットカウント部103を配設し、第一面の記録を行ったときのドットカウント部103から得られた情報に基づき、搬送ベルト31に印加する電圧を変え、第二面の記録を行うことにした。この結果、第二面の記録を行う場合にも、第一面の記録を行う場合と同様に、安定して記録媒体Pを搬送ベルト31に吸着することができる。   As shown in FIG. 6, when the amount of recording on the recording medium P increases and the amount of ink droplets driven into the recording medium P increases, the water content of the recording medium P increases in proportion to the moisture in the ink. To increase. As described above, when the water content of the recording medium P increases, the recording medium P becomes difficult to be attracted to the conveyance belt 31. For this reason, as shown in FIG. 7, the control unit 100 in the recording apparatus 1 is provided with a dot count unit 103 for calculating the ink droplet ejection amount (recording amount), and recording on the first surface is performed. Based on the information obtained from the dot count unit 103, the voltage applied to the conveyor belt 31 is changed and recording on the second surface is performed. As a result, when recording on the second surface, the recording medium P can be stably adsorbed to the transport belt 31 as in the case of recording on the first surface.

ここで、搬送装置及び記録装置の制御部(制御手段)について説明する。図7に示すように、記録装置1の制御部100は、パーソナルコンピュータからの画像情報を処理する画像処理部102と、画像処理部102の情報に基づいて記録部7の駆動制御等を行うヘッド制御部101とを有する。また、画像処理部102には、ヘッド制御部101に伝送した記録量をカウントするドットカウント部103と、両面搬送路61内に蓄えられた複数枚の記録媒体それぞれの画像情報を記憶することのできるページメモリ(記憶手段)104を有する。   Here, the control unit (control unit) of the transport apparatus and the recording apparatus will be described. As shown in FIG. 7, the control unit 100 of the recording apparatus 1 includes an image processing unit 102 that processes image information from a personal computer, and a head that performs drive control of the recording unit 7 based on information of the image processing unit 102. And a control unit 101. Further, the image processing unit 102 stores the dot count unit 103 that counts the recording amount transmitted to the head control unit 101, and the image information of each of the plurality of recording media stored in the double-sided conveyance path 61. A page memory (storage means) 104 is provided.

図8及び図9は、吸着力−含水量−印可電圧の関係図である。尚、縦軸は吸着力、コックリング抑制電圧、横軸は記録媒体の含水量を示す。   FIG. 8 and FIG. 9 are relationship diagrams of adsorption force-water content-applied voltage. The vertical axis represents the adsorption force and cockling suppression voltage, and the horizontal axis represents the water content of the recording medium.

図8に示すように、電極板への印可電圧を±0.5kV、±1.0kV、±1.5kV(+0.5kVまたは−0.5kV、+1.0kVまたは−1.0kV、+1.5kVまたは−1.5kV、以下同様)時の吸着力は、記録媒体の含水量が増加すると共に低下する。また、印可電圧が高くなると記録ヘッドよりインクを吐出するとき電界の影響を受けて吐出滴が位置ズレを起こす事をヨレと定義し、±1.5kV曲線の上下に、ヨレ安全範囲、ヨレ許容範囲曲線を形成した。ここで、ヨレ許容範囲以下の電圧なら記録品位に影響を与えることはないが、ヨレ安全範囲以下の電圧であることが好ましい。   As shown in FIG. 8, the applied voltage to the electrode plate is ± 0.5 kV, ± 1.0 kV, ± 1.5 kV (+0.5 kV or −0.5 kV, +1.0 kV or −1.0 kV, +1.5 kV Or, the adsorption force at −1.5 kV (the same applies hereinafter) decreases as the water content of the recording medium increases. In addition, when the applied voltage increases, it is defined that the ejection droplet is displaced due to the influence of the electric field when the ink is ejected from the recording head, and the misalignment is within the ± 1.5 kV curve. A range curve was formed. Here, if the voltage is less than the allowable tolerance range, the recording quality is not affected, but the voltage is preferably less than the acceptable safety range.

また、コックリング抑制印可電圧とは、記録媒体にインクを打ち込むとインク中の水分により記録媒体が膨潤し、波打ちを伴う現象を抑制するために印加する電圧である。図6から分かるように、通常の室温環境において、記録媒体を搬送ベルトに吸着させるためには印加電圧を±0.6kV位にすればよいが、低温低湿の場合には±0.4kV位で足り、高温多湿の場合には±1.0kV位の印加電圧が必要となることがわかる。これは、環境により記録媒体内の水分量(含水量)が異なるためであり、特に高温多湿の環境では含水量が多く、吸着しにくくなる。このため、含水量が多くなるにつれ、搬送ベルト31に対する印加電圧を高くする必要が生ずる。図において、コックリング抑制印加電圧以上であれば、記録媒体Pを搬送ベルト31に確実に吸着することができる。   The cockling suppression applied voltage is a voltage that is applied to suppress a phenomenon that undulates when the ink is driven into the recording medium due to moisture in the ink. As can be seen from FIG. 6, in order to attract the recording medium to the conveying belt in a normal room temperature environment, the applied voltage may be set to about ± 0.6 kV, but in the case of low temperature and low humidity, it is about ± 0.4 kV. It can be seen that in the case of high temperature and high humidity, an applied voltage of about ± 1.0 kV is required. This is because the moisture content (moisture content) in the recording medium varies depending on the environment. In particular, the moisture content is high in a high-temperature and high-humidity environment, making it difficult to adsorb. For this reason, as the water content increases, it becomes necessary to increase the voltage applied to the conveyor belt 31. In the figure, the recording medium P can be reliably adsorbed to the transport belt 31 as long as it is equal to or higher than the cockling suppression applied voltage.

次に両面搬送時の搬送ベルトへの印加電圧及び吸着力に関して、片面搬送時との違いについて説明する。   Next, the difference between the voltage applied to the conveyor belt and the attracting force during double-sided conveyance and during single-sided conveyance will be described.

図9に示すように、片面搬送時に標準的な画像記録をする際に、搬送ベルトへ記録媒体を吸着するために搬送ベルトに対する印加電圧は±1.0kV位である。この環境下において両面搬送部6を通して両面搬送を行い記録を行う場合、既に記録媒体にはインクが打ち込まれているので、記録媒体の含水量が増加している(図9の「両面時」の線を参照)。   As shown in FIG. 9, when standard image recording is performed during single-sided conveyance, the applied voltage to the conveyance belt is about ± 1.0 kV in order to attract the recording medium to the conveyance belt. In this environment, when recording is performed by carrying the double-sided conveyance through the double-sided conveyance unit 6, since the ink has already been applied to the recording medium, the water content of the recording medium has increased (in the case of “both sides” in FIG. 9). See line).

このような場合、搬送ベルトに対して確実に記録媒体を吸着するためには、より(絶対値が)大きな電圧を搬送ベルトに印加する必要が生ずる。ここで、前述した環境下においては、両面搬送時に記録媒体に対して印加する電圧は±1.5kVである。即ち、両面搬送時は片面搬送時と比べて少なくとも±0.5kV以上の電圧を更に印加する必要がある。   In such a case, it is necessary to apply a larger voltage (having an absolute value) to the conveyance belt in order to reliably attract the recording medium to the conveyance belt. Here, in the environment described above, the voltage applied to the recording medium during the double-sided conveyance is ± 1.5 kV. That is, it is necessary to further apply a voltage of at least ± 0.5 kV at the time of double-sided conveyance compared to at the time of single-sided conveyance.

また、記録ヘッドからの記録媒体に対するインクの打ち込み量を最大にすると、記録媒体の含水量は更に高まる。このため、両面搬送時の記録を行う際に、安定した記録媒体の搬送をするためには、搬送ベルトに対する印加電圧を更に増加させる必要がある。本実施例においては、片面搬送時に、記録ヘッドから最大打ち込み量のインクを記録媒体に打ち込んだとき、搬送ベルトへの印加電圧は±2.0kVになる。即ち、両面搬送時は、片面搬送時と比べて少なくとも±1.0kV以上の電圧を更に印加する必要がある。   Further, when the ink ejection amount from the recording head to the recording medium is maximized, the water content of the recording medium is further increased. For this reason, it is necessary to further increase the voltage applied to the conveyor belt in order to stably transport the recording medium when performing recording during duplex conveyance. In this embodiment, when the maximum amount of ink is ejected from the recording head onto the recording medium during single-sided conveyance, the voltage applied to the conveyance belt becomes ± 2.0 kV. That is, at the time of double-sided conveyance, it is necessary to further apply a voltage of at least ± 1.0 kV as compared with that at the time of single-sided conveyance.

このため本実施例においては、片面搬送時よりも両面搬送時の搬送ベルトに対する印加電圧を増加させることで、記録媒体を安定して搬送ベルトに吸着させるようにしている。即ち、第一面を表面にして記録媒体を搬送する場合の搬送ベルトと記録媒体との電位差よりも、第二面を表面にして記録媒体を搬送する場合の搬送ベルトと記録媒体との電位差の方が大きくなるように、搬送ベルトへの印加電圧を変化させている。   For this reason, in this embodiment, the recording medium is stably adsorbed to the conveyance belt by increasing the voltage applied to the conveyance belt during double-sided conveyance rather than during single-sided conveyance. That is, the potential difference between the transport belt and the recording medium when transporting the recording medium with the second surface as the surface is larger than the potential difference between the transport belt and the recording medium when transporting the recording medium with the first surface as the surface. The applied voltage to the conveyor belt is changed so that the direction becomes larger.

すなわち、第一面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差よりも、第二面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差方が大きくなるように電極板36aに対する印加電圧の絶対値を大きくする。   That is, the potential difference between the first electrode group and the second electrode group when transporting the recording medium with the first surface as the surface is greater than the first difference when the recording medium is transported with the second surface as the surface. The absolute value of the voltage applied to the electrode plate 36a is increased so that the potential difference between the one electrode group and the second electrode group is increased.

たとえば第二面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差を前記記憶手段に記憶された前記記録量が第1の記録量のとき第1の電位差に、第1の記憶量より多い第2の記録量のとき、第1の電位差より大きい第2の電位差になるように電極板36aに対する印加電圧の絶対値を大きくする。   For example, the potential difference between the first electrode group and the second electrode group when the recording medium is transported with the second surface as the surface is the first when the recording amount stored in the storage means is the first recording amount. The absolute value of the voltage applied to the electrode plate 36a is increased so that the second potential difference is larger than the first potential difference when the second recording amount is larger than the first storage amount.

印加電圧を変化させる構成を具体的に説明する。まず、第一面の記録を行うとき、記録媒体Pに対するインク滴の打ち込み量即ち記録媒体Pに対する記録量を、ドットカウント部103にて算出する。次に制御部(制御手段)100は、ドットカウント部103によって算出された数値に基づいて記録媒体の含水量を判断する。そして制御手段は、前記含水量の変化に応じて例えば図9のグラフの関係を用いるなどして、搬送ベルトに対して増加する印加電圧量を決定し、該増加する印加電圧量を更に印加する。   The configuration for changing the applied voltage will be specifically described. First, when recording on the first surface, the dot count unit 103 calculates the ink droplet ejection amount on the recording medium P, that is, the recording amount on the recording medium P. Next, the control unit (control unit) 100 determines the water content of the recording medium based on the numerical value calculated by the dot count unit 103. And a control means determines the applied voltage amount which increases with respect to a conveyance belt, for example using the relationship of the graph of FIG. 9, etc. according to the change of the said moisture content, and further applies this increased applied voltage amount .

このように構成することで、本実施例の記録装置は、含水量が多くコックリングが発生した記録媒体を搬送する際に、各搬送面に対して所望の印加電圧を加えることで、記録媒体の搬送ベルトに対する吸着力を増し、記録媒体を確実に搬送ベルトに吸着させることができる。本実施例によれば、記録媒体を確実に搬送ベルトに吸着するため、記録ヘッドと記録媒体との距離を一定に保つことができ、両面搬送においても記録品位を維持することができる。   With this configuration, the recording apparatus of the present embodiment applies a desired applied voltage to each transport surface when transporting a recording medium having a high water content and causing cockling. Therefore, the recording medium can be reliably adsorbed to the conveyance belt. According to the present embodiment, since the recording medium is reliably adsorbed to the conveyance belt, the distance between the recording head and the recording medium can be kept constant, and the recording quality can be maintained even in the double-sided conveyance.

ところで、記録媒体の両面に対する記録を行う際には、第一面の記録を行った後に記録媒体を裏返して第二面の記録を行うのだが、連続して記録を行う場合に、ある記録媒体に対して両面への記録をした後、次の記録媒体を供給することとすると、近年の高速の記録を達成することは困難である。このため、本実施形態においては、第一面の記録が完了した時点で、一旦、両面搬送路61内に記録媒体を保持しておく。   By the way, when performing recording on both sides of the recording medium, after recording on the first side, the recording medium is turned over and recording on the second side is performed. However, if the next recording medium is supplied after recording on both sides, it is difficult to achieve high-speed recording in recent years. For this reason, in the present embodiment, the recording medium is once held in the double-sided conveyance path 61 when the recording on the first surface is completed.

両面搬送路61内に第一面の記録が終了した最初の記録媒体を搬送すると同時に、後続の記録媒体の第一面の記録を行う。そして、後続の記録媒体を両面搬送路61内に搬送する動作に伴って、両面搬送路61内から前記最初の記録媒体が、記録部7と対向する位置に搬送される。搬送された前記最初の記録媒体には第二面の記録部7によって記録が行われる。   The first recording medium on which recording on the first surface is completed is transported into the double-sided conveyance path 61, and at the same time, recording on the first surface of the subsequent recording medium is performed. Then, the first recording medium is conveyed from the double-sided conveyance path 61 to a position facing the recording unit 7 with the operation of conveying the subsequent recording medium into the double-sided conveyance path 61. Recording is performed on the transported first recording medium by the recording unit 7 on the second side.

このように、最初の記録媒体の第一面の記録をした後両面搬送路61内に搬送すると同時に、後続の記録媒体に対して記録部7により第一面の記録を行う。次に後続の記録媒体を両面搬送路61に搬送すると同時に、前記最初の記録媒体を記録部7に対向する位置に搬送し、記録部7により記録を行う。このように、後続の記録媒体の第一面の記録と、最初の記録媒体の第二面の記録とを交互に行うことにより、記録速度の高速化を実現することができる。   In this way, after recording on the first surface of the first recording medium, the recording surface 7 records the first surface of the subsequent recording medium at the same time as it is transported into the duplex transport path 61. Next, the subsequent recording medium is conveyed to the double-sided conveyance path 61, and at the same time, the first recording medium is conveyed to a position facing the recording unit 7, and recording is performed by the recording unit 7. As described above, the recording speed can be increased by alternately performing the recording on the first surface of the subsequent recording medium and the recording on the second surface of the first recording medium.

尚、ここでは最初と後続との2種類の記録媒体を例示して説明したが、これに限るものではない。即ち、両面搬送路61には記録媒体を複数枚保持することができる構成にしてもよい。ここで、前述のようにドットカウント部103には複数枚の記録媒体の各々の記録量を記憶するページメモリ104が付帯されている。このため、ページメモリ104に、両面搬送路61内に搬送された複数枚の記録媒体それぞれの第一面の記録量を記憶することにより、より連続的に、第一面と第二面との記録を交互に行うことができる。   Here, two types of recording media, the first and the subsequent, have been described as examples, but the present invention is not limited to this. That is, the double-sided conveyance path 61 may be configured to hold a plurality of recording media. Here, as described above, the dot count unit 103 is accompanied by the page memory 104 for storing the recording amounts of the plurality of recording media. Therefore, by storing the recording amount of the first surface of each of the plurality of recording media conveyed in the double-sided conveyance path 61 in the page memory 104, the first surface and the second surface are more continuously recorded. Recording can be performed alternately.

この場合、制御手段は、第一面の記録を行う場合の記録媒体に対する印加電圧と第二面の記録を行う場合の記録媒体に対する印加電圧とを、ドットカウント部103での記録量により算出したデータに応じて、交互に変化させる。   In this case, the control means calculates the applied voltage to the recording medium when performing recording on the first side and the applied voltage to the recording medium when performing recording on the second side based on the recording amount in the dot count unit 103. It is changed alternately according to the data.

電圧の変化の際には、記録媒体の間隔を、最初の記録ヘッドから最後の記録ヘッドまでの間の距離よりも広く取り、その間の電圧を個別に制御することで可能である。また、実機においては、記録ヘッドの間隔が80mm、記録媒体と記録媒体との間隔が100mm、制御電圧の印加範囲を90mmとすることで独立した制御が可能となる。   When the voltage changes, the interval between the recording media can be made wider than the distance from the first recording head to the last recording head, and the voltage therebetween can be controlled individually. In an actual machine, independent control is possible by setting the interval between the recording heads to 80 mm, the interval between the recording media to 100 mm, and the control voltage application range to 90 mm.

〔他の実施例〕
前述の実施例においては、片面搬送時と両面搬送時の印加電圧の変更に際して、制御手段が記録媒体の含水量や記録媒体に対する記録量の信号を検出して、印加電圧を変更することとしたが、これに限るものではない。例えば、記録媒体の片面(第一面)の搬送時よりも、該第一面と反対面(第二面)の搬送時の方が一律に追加電圧(例えば一律に±0.5kV)の分だけ多くの電圧を印加するように、印加電圧を変更する制御をするとしてもよい。
[Other Examples]
In the above-described embodiment, when the applied voltage is changed during single-sided conveyance and double-sided conveyance, the control means detects the moisture content of the recording medium and the recording amount signal for the recording medium, and changes the applied voltage. However, it is not limited to this. For example, the additional voltage (for example, ± 0.5 kV) is uniformly applied when the recording medium is conveyed on the opposite surface (second surface) than when the recording medium is conveyed on one surface (first surface). Control may be made to change the applied voltage so as to apply as many voltages as possible.

また、前述した実施例においては、搬送部材として、つなぎ目のない無端状の搬送ベルトを例示したが、これに限るものではない。例えば、ドラム形状のものとしてもよい。   In the above-described embodiment, an endless transport belt having no joint is exemplified as the transport member, but the present invention is not limited to this. For example, a drum shape may be used.

また、前述した実施例においては、異なる色のインクで記録する複数個の記録ヘッドを用いるカラー記録用のインクジェット両面記録装置の場合を例示して説明したが、本発明はこれに限定されるものではなく、例えば、1個の記録ヘッドを用いるインクジェット記録装置、或いは同一色彩で濃度の異なるインクで記録する複数の記録ヘッドを用いる階調記録用のインクジェット記録装置など、記録ヘッドの数にも関係なく同様に適用ができ、同様の作用効果を達成し得るものである。   In the above-described embodiments, the case of an inkjet double-side recording apparatus for color recording using a plurality of recording heads that record with different color inks has been described as an example. However, the present invention is not limited to this. Rather, for example, an inkjet recording apparatus that uses one recording head, or an inkjet recording apparatus for gradation recording that uses a plurality of recording heads that record with the same color and different densities, also relates to the number of recording heads. The present invention can be applied in a similar manner, and the same effects can be achieved.

更に記録手段(記録ヘッド)としては、記録ヘッドとインクタンクを一体化したカートリッジタイプのもの、或いは記録ヘッドとインクタンクを別体としこれらをインク供給チューブで接続する構成のものなど、記録手段及びインクタンクの構成がどのようなものであっても、同様に適用することができ、同様の効果を達成し得るものである。   Further, as the recording means (recording head), the recording type and the recording head and the ink tank are integrated, or the recording head and the ink tank are separated and connected by an ink supply tube. Any configuration of the ink tank can be applied in the same manner, and the same effect can be achieved.

尚、本発明をインクジェット記録装置に適用する場合には、例えば、ピエゾ素子等の電気機械変換体等を用いる記録手段を使用するものに適用できるが、中でも、熱エネルギーを利用してインクを吐出する方式の記録手段を使用するインクジェット記録装置において優れた効果をもたらすものである。かかる方式によれば、記録の高密度化、高精細化が達成できるからである。   In addition, when the present invention is applied to an ink jet recording apparatus, it can be applied to, for example, a recording unit that uses an electromechanical transducer such as a piezo element. In particular, ink is ejected using thermal energy. In the ink jet recording apparatus using the recording means of the above system, an excellent effect is brought about. This is because such a system can achieve higher recording density and higher definition.

更に、記録ヘッドを記録媒体の搬送方向と直交する方向に移動させつつ記録を行う所謂シリアルタイプの記録装置に対しても、本発明は有効に適用できる。或いは、記録ヘッドが記録可能な記録媒体の最大幅に対応した長さを有するフルラインタイプの記録装置であっても、そのような記録ヘッドとしては、複数記録ヘッドの組合せによって、その長さを満たす構成や、一体的に形成された1個の記録ヘッドとしての構成のいずれでも良い。加えて、前述したシリアルタイプのものでも、装置本体に固定された記録ヘッド、或いは装置本体に装着されることで装置本体との電気的な接続や装置本体からのインクの供給が可能になる交換自在のチップタイプの記録ヘッド、或いは記録ヘッド自体に一体的にインクタンクが設けられたカートリッジタイプの記録ヘッドを用いた場合にも本発明は有効である。   Furthermore, the present invention can be effectively applied to a so-called serial type recording apparatus that performs recording while moving the recording head in a direction orthogonal to the conveyance direction of the recording medium. Alternatively, even in the case of a full-line type recording apparatus having a length corresponding to the maximum width of a recording medium that can be recorded by the recording head, such a recording head has a length that is determined by a combination of a plurality of recording heads. Either a satisfying configuration or a single recording head formed integrally may be used. In addition, even with the serial type described above, the recording head fixed to the main body of the apparatus, or the replacement that enables the electrical connection with the main body of the apparatus and the supply of ink from the main body of the apparatus when mounted on the main body. The present invention is also effective when a free chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself is used.

更に加えて、前述したインクジェット記録装置の形態としては、コンピュータ等の情報処理機器の画像出力端末装置として用いられるものの他、キャリッジに記録ヘッド以外のスキャナ等を装着することが可能なインクジェット入出力装置、リーダ等と組み合わせた複写装置、更には送受信機能を有するファクシミリ装置の形態をとるもの等であっても良い。   In addition, as an embodiment of the above-described ink jet recording apparatus, an ink jet input / output apparatus that can be used as an image output terminal device of an information processing device such as a computer, or a scanner other than a recording head can be mounted on a carriage. Further, it may be a copying machine combined with a reader or the like, or a facsimile machine having a transmission / reception function.

記録装置の全体説明図。1 is an overall explanatory diagram of a recording apparatus. 搬送ベルトを上面から見た図。The figure which looked at the conveyance belt from the upper surface. 搬送ベルトの斜視図。The perspective view of a conveyance belt. 搬送ベルトの断面図。Sectional drawing of a conveyance belt. 搬送ベルトのプラテンに対する吸引力を示す図。The figure which shows the attraction | suction force with respect to the platen of a conveyance belt. 記録媒体の含水量とドットカウントの値との関係を示す図。The figure which shows the relationship between the water content of a recording medium, and the value of a dot count. 制御手段の説明図。Explanatory drawing of a control means. 環境変化による記録媒体の搬送ベルトへの吸着力を示す図。The figure which shows the adsorption | suction force to the conveyance belt of the recording medium by an environmental change. 搬送面の違いによる記録媒体の搬送ベルトへの吸着力を示す図。FIG. 4 is a diagram illustrating an adsorption force of a recording medium to a conveyance belt due to a difference in conveyance surface.

符号の説明Explanation of symbols

P …記録媒体(記録媒体)
1 …記録装置(記録装置)
3 …搬送ベルト部(搬送手段、搬送装置)
6 …両面搬送部(両面搬送部)
7 …記録部(記録手段)
31 …搬送ベルト(搬送部材)
36 …吸着力発生手段(吸着力発生手段)
36a …電極板(電極)
36b …アース板(電極)
52 …給電ブラシ
61 …両面搬送路(両面搬送路)
103 …ドットカウント部(記録量を算出)
104 …ページメモリ(記憶手段)
P: Recording medium (recording medium)
1. Recording device (recording device)
3 ... Conveying belt (conveying means, conveying device)
6 ... Double-sided conveyance unit
7: Recording section (recording means)
31 ... Conveying belt (conveying member)
36… Adsorption force generation means (Adsorption force generation means)
36a ... Electrode plate (electrode)
36b ... Earth plate (electrode)
52… Power supply brush
61… Double-sided conveyance path (Double-sided conveyance path)
103 ... dot count part (recording amount is calculated)
104 ... Page memory (memory means)

Claims (10)

電極に電圧を印加することで記録媒体を吸着搬送する吸着力発生手段を有する搬送部材と、該搬送部材により第一面を表面にして搬送された記録媒体を裏返して、該記録媒体を再び該搬送部材に供給して第二面を表面にして搬送する両面搬送部と、を有する搬送装置において、
前記搬送装置は、前記記録媒体への記録量を記憶する記憶手段を有し、
前記記憶手段に記憶された前記記録量に基づいて、第一面を表面にして記録媒体を搬送する場合の前記搬送部材と記録媒体との電位差よりも、第二面を表面にして記録媒体を搬送する場合の前記搬送部材と記録媒体との電位差の方が大きくなるように、前記搬送部材への印加電圧を変化させることを特徴とする搬送装置。
A conveying member having an attracting force generating means for attracting and conveying the recording medium by applying a voltage to the electrodes, and the recording medium conveyed with the first surface by the conveying member are turned over, and the recording medium is again In a conveying apparatus having a double-sided conveying unit that supplies the conveying member and conveys the second surface as a surface,
The transport device has storage means for storing a recording amount on the recording medium,
Based on the recording amount stored in the storage means, the recording medium is arranged with the second surface as the surface, rather than the potential difference between the conveying member and the recording medium when the recording medium is conveyed with the first surface as the surface. A conveying apparatus, wherein an applied voltage to the conveying member is changed so that a potential difference between the conveying member and a recording medium when conveying is larger.
請求項1に記載の搬送装置において、
前記両面搬送部は、複数枚の記録媒体を蓄えることができる両面搬送路を有し、
前記記憶手段は、第一面を表面にして搬送された記録媒体の前記複数枚分の前記記録量を記憶することを特徴とする搬送装置。
In the conveyance apparatus of Claim 1,
The double-sided conveyance unit has a double-sided conveyance path that can store a plurality of recording media,
The storage device stores the recording amounts of the plurality of recording media conveyed with the first surface as a front surface.
請求項1又は2に記載の搬送装置において、
前記搬送部材はつなぎ目のない無端形状のベルト部材であることを特徴とする搬送装置。
In the conveyance apparatus of Claim 1 or 2,
The conveying apparatus, wherein the conveying member is an endless belt member without a joint.
請求項1乃至3のいずれかに記載の搬送装置において、
前記吸着力発生手段は、異極性の櫛歯状の電極を交互に配置して構成されることを特徴とする搬送装置。
In the conveyance apparatus in any one of Claims 1 thru | or 3,
The attraction force generating means is constituted by alternately arranging comb-like electrodes of different polarities.
記録媒体を搬送する搬送手段と、該搬送手段に対向して配置される記録手段と、を有する記録装置において、
前記搬送手段は、請求項1乃至4のいずれかに記載の搬送装置であることを特徴とする記録装置。
In a recording apparatus comprising: a conveying unit that conveys a recording medium; and a recording unit that is disposed to face the conveying unit.
The recording apparatus according to claim 1, wherein the transport unit is the transport apparatus according to claim 1.
請求項5に記載の記録装置において、
前記記録手段は、記録媒体にインクを吐出するインクジェット記録ヘッドであることを特徴とする記録装置。
The recording apparatus according to claim 5, wherein
The recording apparatus, wherein the recording means is an ink jet recording head that ejects ink onto a recording medium.
インクを吐出する記録手段を用いて記録媒体にして記録を行う記録装置において、
前記記録手段によって記録が行われる位置において記録媒体を搬送する搬送ベルトと、
前記搬送ベルトの内部であって搬送方向に配列した複数の電極を有する第一電極群と、
前記搬送ベルトの内部であって前記第一電極群の各電極間に配置した複数の電極を有する第二電極群と、
前記第一電極群と第二電極群との間に電位差を設けて発生する静電気力によって前記記録媒体を前記搬送ベルトに吸着搬送するために、前記各電極群が所定の電位になるように前記各電極群に荷電する荷電手段と、
第一面に記録が行われた記録媒体の第二面に記録を行うために、前記搬送手段によって第一面を表面にして搬送された記録媒体を表裏を反転して第2面を表面にして前記搬送手段に送る両面搬送部と、
前記記録媒体への記録量を記憶する記憶手段
第一面を表面にして記録媒体を搬送する場合と第二面を表面にして記録媒体を搬送する場合とで前記第一電極群と第二電極群との間の電位差が異なるように前記荷電手段を制御するとともに、第二面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差を前記記憶手段に記憶された前記記録量に応じて変化させる制御手段と、を有することを特徴とする記録装置。
In a recording apparatus for recording on a recording medium using a recording means for discharging ink,
A transport belt for transporting a recording medium at a position where recording is performed by the recording means;
A first electrode group having a plurality of electrodes arranged in the transport direction inside the transport belt;
A second electrode group having a plurality of electrodes arranged between the electrodes of the first electrode group inside the conveyor belt;
In order to attract and convey the recording medium to the conveyance belt by electrostatic force generated by providing a potential difference between the first electrode group and the second electrode group, the electrode groups are set to have a predetermined potential. Charging means for charging each electrode group;
In order to perform recording on the second surface of the recording medium on which recording has been performed on the first surface, the recording medium conveyed by the conveying means with the first surface as the front surface is reversed so that the second surface is the front surface. A double-sided conveyance unit to be sent to the conveyance means,
Storage means for storing the recording amount to the recording medium The first electrode group and the second electrode when the recording medium is transported with the first surface as the front surface and when the recording medium is transported with the second surface as the surface The charging means is controlled so that the potential difference between the groups differs, and the potential difference between the first electrode group and the second electrode group when the recording medium is conveyed with the second surface as the surface is stored in the memory. Control means for changing the recording amount according to the recording amount stored in the means.
請求項7に記載の記録装置において、
前記制御手段は、第一面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差よりも、第二面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差の方が大きくなるように制御することを特徴とする記録装置。
The recording apparatus according to claim 7, wherein
When the control means transports the recording medium with the second surface as the surface, rather than the potential difference between the first electrode group and the second electrode group when the recording medium is transported with the first surface as the surface. The recording apparatus is controlled so that a potential difference between the first electrode group and the second electrode group is larger.
請求項8に記載の記録装置において、
前記制御手段は、第二面を表面にして記録媒体を搬送する場合の前記第一電極群と第二電極群との間の電位差を前記記憶手段に記憶された前記記録量が第1の記録量のとき第1の電位差に、第1の記憶量より多い第2の記録量のとき、第1の電位差より大きい第2の電位差になるように前記電荷手段を制御することを特徴とする記録装置。
The recording apparatus according to claim 8, wherein
The control means stores the potential difference between the first electrode group and the second electrode group when the recording medium is conveyed with the second surface as a surface, and the recording amount stored in the storage means is the first recording. The charge means is controlled so that the first potential difference is greater than the first potential difference and the second potential difference is greater than the first potential difference when the second recording amount is greater than the first storage amount. apparatus.
請求項7乃至請求項9のいずれかに記載の記録装置において、
前記記録手段は、記録媒体にインクを吐出するインクジェット記録ヘッドであることを特徴とする記録装置。
The recording apparatus according to any one of claims 7 to 9,
The recording apparatus, wherein the recording means is an ink jet recording head that ejects ink onto a recording medium.
JP2004165804A 2004-06-03 2004-06-03 Recording device Expired - Fee Related JP4464201B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7992954B2 (en) 2006-09-13 2011-08-09 Ricoh Company, Ltd. Image forming apparatus capable of increasing throughput of duplex printing
JP2014172709A (en) * 2013-03-08 2014-09-22 Seiko Epson Corp Recording device and recording method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7992954B2 (en) 2006-09-13 2011-08-09 Ricoh Company, Ltd. Image forming apparatus capable of increasing throughput of duplex printing
JP2014172709A (en) * 2013-03-08 2014-09-22 Seiko Epson Corp Recording device and recording method

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