JP6795017B2 - Image forming device - Google Patents

Image forming device Download PDF

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JP6795017B2
JP6795017B2 JP2018177768A JP2018177768A JP6795017B2 JP 6795017 B2 JP6795017 B2 JP 6795017B2 JP 2018177768 A JP2018177768 A JP 2018177768A JP 2018177768 A JP2018177768 A JP 2018177768A JP 6795017 B2 JP6795017 B2 JP 6795017B2
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聡 北岡
聡 北岡
佐藤 健司
健司 佐藤
池上 廣和
廣和 池上
好昭 星野
好昭 星野
秀明 西村
秀明 西村
陽子 石井
陽子 石井
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Ricoh Co Ltd
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Description

本発明は画像形成装置に関する。 The present invention relates to an image forming apparatus.

液体を吐出する液体吐出ヘッドを用いて画像を形成する液体吐出記録方式の画像形成装置にあっては、媒体上に付着した液体の乾燥を促進し、媒体のコックリング(膨潤による波打ち)を低減しようとするものがある。 In a liquid discharge recording type image forming apparatus that forms an image using a liquid discharge head that discharges liquid, it promotes drying of the liquid adhering to the medium and reduces cockling (waviness due to swelling) of the medium. There is something to try.

例えば、所定の曲率を有する乾燥ドラムの周面を媒体の裏面側(画像が形成されていない面)側に接触させて媒体の乾燥とコックリングの低減を行うものが知られている(特許文献1)。 For example, there is known a method in which the peripheral surface of a drying drum having a predetermined curvature is brought into contact with the back surface side (the surface on which an image is not formed) of the medium to dry the medium and reduce cockling (Patent Documents). 1).

特開2010−167592号公報JP-A-2010-167592

しかしながら、特許文献1に開示の構成にあっても媒体に発生したコックリングを十分に低減することができないという課題がある。 However, even with the configuration disclosed in Patent Document 1, there is a problem that the cockling generated in the medium cannot be sufficiently reduced.

本発明は上記の課題に鑑みてなされたものであり、媒体に発生したコックリングの低減効率を向上することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to improve the efficiency of reducing cockling generated in a medium.

上記の課題を解決するため、本発明の請求項1に係る乾燥装置は、
媒体の液体が付着され画像形成された面とは反対の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱される
構成とした。
In order to solve the above problems, the drying apparatus according to claim 1 of the present invention is
It has a medium heating means for heating the medium by contacting the surface opposite to the surface on which the liquid of the medium is attached and the image is formed.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. It was configured to be heated by contact.

上記の課題を解決するため、本発明に係る画像形成装置は、
媒体に対して液滴を吐出して画像を形成する画像形成手段と、
前記画像が形成された前記媒体の画像が形成された面と反対の裏面側に接触して、前記 媒体を加熱する媒体加熱手段と、を有し、
前記媒体加熱手段は、前記媒体接触する接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱される経路を有している
構成とした。
In order to solve the above problems, the image forming apparatus according to the present invention is
An image forming means that ejects droplets onto a medium to form an image,
It has a medium heating means for heating the medium by contacting the back surface side opposite to the surface on which the image of the medium on which the image is formed is formed.
The medium heating means comprises a plurality of contact heating element the curvature of the contact surface is different in contact with said medium,
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. It was configured to have a path of contact and heating .

本発明に係る画像形成装置の一例の概略説明図である。It is a schematic explanatory drawing of an example of the image forming apparatus which concerns on this invention. 同じく乾燥装置部分の拡大説明図である。Similarly, it is an enlarged explanatory view of the drying apparatus part. 相対的に曲率が小さな接触部材の接触面と媒体との密着性の説明に供する斜視説明図である。It is a perspective explanatory view provided for explaining the adhesion between a contact surface of a contact member having a relatively small curvature and a medium. 相対的に曲率が大きな接触部材の接触面と媒体との密着性の説明に供する斜視説明図である。It is a perspective explanatory view provided for explaining the adhesion between the contact surface of a contact member having a relatively large curvature and a medium. 本発明の第2実施形態の説明に供する斜視説明図である。It is a perspective explanatory drawing which provides the explanation of the 2nd Embodiment of this invention. 本発明の第3実施形態の説明に供する斜視説明図である。It is a perspective explanatory drawing which provides the explanation of the 3rd Embodiment of this invention. 本発明の第4実施形態の説明に供する斜視説明図である。It is a perspective explanatory drawing provided with the explanation of 4th Embodiment of this invention. 本発明の第5実施形態の説明に供する斜視説明図である。It is a perspective explanatory drawing provided with the explanation of 5th Embodiment of this invention.

以下、本発明の実施の形態について添付図面を参照して説明する。まず、本発明に係る画像形成装置の一例について図1を参照して説明する。図1は同画像形成装置の概略説明図である。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, an example of the image forming apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a schematic explanatory view of the image forming apparatus.

この画像形成装置は、フルライン型インクジェット記録装置であり、連続紙である媒体110に対して所要の色の液滴を吐出して画像を形成する液体吐出ヘッドで構成された画像形成部101を有している。 This image forming apparatus is a full-line type inkjet recording apparatus, and has an image forming unit 101 composed of a liquid ejection head that ejects droplets of a required color onto a medium 110 that is continuous paper to form an image. Have.

画像形成部101は、例えば、媒体搬送方向上流側から、4色分のフルライン型記録ヘッド111K、111C、111M、111Yが配置されている。各記録ヘッド111は、それぞれ、搬送される媒体110に対してブラックK,シアンC、マゼンタM、イエローYの液滴を吐出する。なお、色の種類及び数はこれに限るものではない。 In the image forming unit 101, for example, full-line recording heads 111K, 111C, 111M, 111Y for four colors are arranged from the upstream side in the medium transport direction. Each recording head 111 ejects droplets of black K, cyan C, magenta M, and yellow Y to the conveyed medium 110, respectively. The types and numbers of colors are not limited to this.

媒体110は、元巻きローラ102から巻き出され、搬送部103の搬送ローラ112によって、画像形成部101に対向して配置された搬送ガイド部材113上に送り出され、搬送ガイド部材113で案内されて搬送される。 The medium 110 is unwound from the original winding roller 102, sent out by the transport roller 112 of the transport unit 103 onto the transport guide member 113 arranged to face the image forming section 101, and guided by the transport guide member 113. Be transported.

画像形成部101によって画像が形成された媒体110は、乾燥装置104を経て、排出ローラ114によって送られて、巻取りローラ105に巻き取られる。 The medium 110 on which the image is formed by the image forming unit 101 is sent by the discharge roller 114 via the drying device 104, and is taken up by the take-up roller 105.

次に、乾燥装置について図2も参照して説明する。図2は同乾燥装置部分の拡大説明図である。 Next, the drying apparatus will be described with reference to FIG. FIG. 2 is an enlarged explanatory view of the drying device portion.

乾燥装置104は、媒体加熱手段を構成する接触加熱部材(以下、「接触部材」という。)であるローラ部材としての加熱ローラ141A〜141D(区別しないときは、「加熱ローラ141」という。)と、複数の案内ローラ142A〜142Dとを備えている。 The drying device 104 includes heating rollers 141A to 141D (when not distinguished, referred to as "heating roller 141") as roller members which are contact heating members (hereinafter, referred to as "contact members") constituting the medium heating means. , A plurality of guide rollers 142A to 142D are provided.

加熱ローラ141A〜141Dは、画像が形成された媒体110の画像形成面と反対の裏面側に接触する位置に配置されている。 The heating rollers 141A to 141D are arranged at positions where they come into contact with the back surface side of the medium 110 on which the image is formed, which is opposite to the image forming surface.

加熱ローラ141A〜141Dは、媒体110が接触する所定の曲率を有する接触部材であり、媒体110は、媒体搬送方向における接触範囲で、媒体搬送方向と直交する方向である幅方向の全域に亘って、接触面に密着している。 The heating rollers 141A to 141D are contact members having a predetermined curvature with which the medium 110 comes into contact, and the medium 110 covers the entire width direction which is orthogonal to the medium transport direction in the contact range in the medium transport direction. , In close contact with the contact surface.

つまり、加熱ローラ141A〜141Dは、接触面となる周面の曲率を、媒体110が媒体搬送方向における接触範囲で、媒体送り方向と直交する方向である幅方向の全域に亘って、接触面に密着する曲率にしている。 That is, the heating rollers 141A to 141D apply the curvature of the peripheral surface serving as the contact surface to the contact surface over the entire width direction in which the medium 110 is in the contact range in the medium transport direction and is orthogonal to the medium feed direction. The curvature is set to be in close contact.

具体的には、加熱ローラ141A〜141Dは、いずれも、坪量100gsm未満の媒体110を使用する装置では、半径R=75mm(φ150mm)以下にしている。また、加熱ローラ141は、坪量100gsm以上の媒体110を使用する装置では、半径R=125mm(φ250mm)以下にすることが好ましい。 Specifically, all of the heating rollers 141A to 141D have a radius R = 75 mm (φ150 mm) or less in a device using the medium 110 having a basis weight of less than 100 gsm. Further, the heating roller 141 preferably has a radius R = 125 mm (φ250 mm) or less in an apparatus using a medium 110 having a basis weight of 100 gsm or more.

このとき、加熱ローラ141の半径の下限値については、内部に熱源を配置すること、強度が必要であること、媒体110を加熱するための媒体110の押し付け幅(媒体110がローラ141に当たる幅(長さ))が長い方が熱をより媒体110に伝達しやすいことから、半径30mm以上とすることが好ましい。 At this time, regarding the lower limit of the radius of the heating roller 141, the heat source is arranged inside, the strength is required, and the pressing width of the medium 110 for heating the medium 110 (the width at which the medium 110 hits the roller 141 (). The longer the length)), the easier it is to transfer heat to the medium 110. Therefore, the radius is preferably 30 mm or more.

ここで、接触部材の媒体との接触面における曲率と媒体のコックリング低減作用について図3及び図4を参照して説明する。図3は相対的に接触面における曲率が大きいとき、図4は相対的に接触面における曲率が小さいときを示している。 Here, the curvature of the contact member on the contact surface with the medium and the cockling reducing action of the medium will be described with reference to FIGS. 3 and 4. FIG. 3 shows a case where the curvature on the contact surface is relatively large, and FIG. 4 shows a case where the curvature on the contact surface is relatively small.

まず、図3に示すように、媒体110との接触面200の曲率が大きい(半径が小さい)ときには、媒体の送り方向における接触面200との接触範囲201で、媒体の送り方向と直交する方向である媒体幅方向の全域に亘って、媒体110が接触面200に密着する。 First, as shown in FIG. 3, when the curvature of the contact surface 200 with the medium 110 is large (the radius is small), the contact range 201 with the contact surface 200 in the medium feed direction is a direction orthogonal to the medium feed direction. The medium 110 is in close contact with the contact surface 200 over the entire area in the width direction of the medium.

これにより、画像300が形成されることで媒体110に発生したコックリングが矯正されて低減される。そして、コックリングが低減されることで、媒体加熱手段である接触部材の熱が効率的に媒体に伝達されるので、効率的な乾燥を行うことができる。 As a result, the cock ring generated in the medium 110 is corrected and reduced by forming the image 300. Then, by reducing the cock ring, the heat of the contact member, which is the medium heating means, is efficiently transferred to the medium, so that efficient drying can be performed.

一方、図4に示すように、媒体110との接触面200の曲率が小さい(半径が大きい)ときには、媒体送り方向における接触面200との接触範囲201で、媒体搬送方向と直交する方向である媒体幅方向の全域に亘って、媒体110が接触面200に密着しなくなることがある。 On the other hand, as shown in FIG. 4, when the curvature of the contact surface 200 with the medium 110 is small (the radius is large), the contact range 201 with the contact surface 200 in the medium feed direction is orthogonal to the medium transfer direction. The medium 110 may not be in close contact with the contact surface 200 over the entire area in the medium width direction.

その結果、画像300が形成されることで媒体110に発生したコックリングが低減されずに、そのまま接触面200を通過する。このとき、媒体110が接触面200に密着しないことで、浮いている箇所では媒体加熱手段である接触部材の熱が媒体110に伝達されないので、効率的な乾燥を行うこともできない。 As a result, the cock ring generated in the medium 110 due to the formation of the image 300 is not reduced and passes through the contact surface 200 as it is. At this time, since the medium 110 does not adhere to the contact surface 200, the heat of the contact member, which is the medium heating means, is not transferred to the medium 110 at the floating portion, so that efficient drying cannot be performed.

そこで、加熱ローラ141A〜141Dは、接触面となる周面が、媒体110が媒体搬送方向における接触範囲で、媒体送り方向と直交する方向である幅方向の全域に亘って、接触面に密着する曲率となる半径Rを有している。 Therefore, in the heating rollers 141A to 141D, the peripheral surface serving as the contact surface is in close contact with the contact surface over the entire width direction in which the medium 110 is in the contact range in the medium transport direction and is orthogonal to the medium feed direction. It has a radius R that is a curvature.

そして、本実施形態では、加熱ローラ141A、141B、141C、141Dの半径Rを、それぞれ半径R1、R2、R3、R4(R1<R2<R3<R4)とし、搬送方向下流側ほど半径Rの大きな加熱ローラを配置している。 In the present embodiment, the radii R of the heating rollers 141A, 141B, 141C, and 141D are the radii R1, R2, R3, and R4 (R1 <R2 <R3 <R4), respectively, and the radius R is larger toward the downstream side in the transport direction. A heating roller is placed.

したがって、媒体搬送方向で、上流側から順に配置された加熱ローラ141A、141B、141C、141Dは順に曲率が小さくなる。 Therefore, the curvatures of the heating rollers 141A, 141B, 141C, and 141D arranged in order from the upstream side in the medium transport direction become smaller in order.

このように構成したので、乾燥装置104に送りこまれた媒体110は、曲率が最も大きい加熱ローラ141Aの周面に接触し、加熱ローラ141Aの周面形状に倣ってコックリングが矯正されるとともに、媒体110の裏面が密着することで加熱乾燥される。 With this configuration, the medium 110 sent to the drying device 104 comes into contact with the peripheral surface of the heating roller 141A having the largest curvature, and the cock ring is corrected according to the peripheral surface shape of the heating roller 141A. The back surface of the medium 110 is brought into close contact with each other to be heated and dried.

この段階で媒体110の液体がある程度乾燥されることで、加熱ローラ141Aを通過した後に復元するコックリングは初期より小さくなる。 By drying the liquid of the medium 110 to some extent at this stage, the cock ring restored after passing through the heating roller 141A becomes smaller than the initial one.

その後、媒体110は、曲率が2番目に大きい加熱ローラ141Bの周面に接触し、加熱ローラ141Bの周面形状に倣ってコックリングが矯正されるとともに、媒体110の裏面が密着することで加熱乾燥される。このとき、加熱ローラ141Bは加熱ローラ141Aよりも曲率が小さいので、媒体110との密着時間が長くなり、伝熱を促進されて、乾燥が促進される。この段階で媒体110の液体をさらに乾燥させることで、加熱ローラ141B通過後に復元するコックリングは前段(加熱ローラ141A通過後)より小さくなる。 After that, the medium 110 comes into contact with the peripheral surface of the heating roller 141B having the second largest curvature, the cock ring is corrected according to the peripheral surface shape of the heating roller 141B, and the back surface of the medium 110 is brought into close contact with the medium 110 to heat the medium 110. To be dried. At this time, since the heating roller 141B has a smaller curvature than the heating roller 141A, the adhesion time with the medium 110 becomes longer, heat transfer is promoted, and drying is promoted. By further drying the liquid of the medium 110 at this stage, the cock ring restored after passing through the heating roller 141B becomes smaller than that in the previous stage (after passing through the heating roller 141A).

その後、媒体110は、曲率が3番目に大きい加熱ローラ141Cの周面に接触し、加熱ローラ141Cの周面形状に倣ってコックリングが矯正されるとともに、媒体110の裏面が密着することで加熱乾燥される。このとき、加熱ローラ141Cは加熱ローラ141Bよりも曲率が小さいので、媒体110との密着時間が長くなり、伝熱を促進されて、乾燥が促進される。この段階で媒体110の液体をさらに乾燥させることで、加熱ローラ141C通過後に復元するコックリングは前段(加熱ローラ141B通過後)より更に小さくなる。 After that, the medium 110 comes into contact with the peripheral surface of the heating roller 141C having the third largest curvature, the cock ring is corrected according to the peripheral surface shape of the heating roller 141C, and the back surface of the medium 110 is brought into close contact with the medium 110 to heat the medium 110. To be dried. At this time, since the heating roller 141C has a smaller curvature than the heating roller 141B, the adhesion time with the medium 110 becomes longer, heat transfer is promoted, and drying is promoted. By further drying the liquid of the medium 110 at this stage, the cock ring restored after passing through the heating roller 141C becomes smaller than that in the previous stage (after passing through the heating roller 141B).

その後、媒体110は、曲率が最も大きい加熱ローラ141Dの周面に接触し、加熱ローラ141Dの周面形状に倣ってコックリングが矯正されるとともに、媒体110の裏面が密着することで加熱乾燥される。このとき、加熱ローラ141Dは加熱ローラ141Cよりも曲率が小さいので、媒体110との密着時間が更に長くなり、伝熱を促進されて、乾燥が促進される。この加熱ローラ141D通過後の段階ではコックリングはなくなる。 After that, the medium 110 comes into contact with the peripheral surface of the heating roller 141D having the largest curvature, the cock ring is corrected according to the peripheral surface shape of the heating roller 141D, and the back surface of the medium 110 is brought into close contact with the medium 110 to be heated and dried. To. At this time, since the heating roller 141D has a smaller curvature than the heating roller 141C, the contact time with the medium 110 is further extended, heat transfer is promoted, and drying is promoted. The cock ring disappears at the stage after passing through the heating roller 141D.

このように、媒体搬送方向で下流側に向かうに従って順に曲率が小さくなる複数の接触部材を配置することで、確実に、コックリングを低減し、乾燥を行うことができる。 In this way, by arranging a plurality of contact members whose curvatures gradually decrease toward the downstream side in the medium transport direction, cockling can be reliably reduced and drying can be performed.

なお、ここでは、複数の接触部材の曲率がすべて異なる例で説明しているが、搬送方向で順に媒体が接触する2つの接触部材のうち、下流側の接触部材の曲率が上流側の接触部材の曲率より小さければよい。 Although the examples described here in which the curvatures of the plurality of contact members are all different, the contact member on the downstream side has the curvature of the contact member on the upstream side of the two contact members in which the medium contacts in order in the transport direction. It should be smaller than the curvature of.

例えば、本実施形態において、加熱ローラ141Aと141B、あるいは、加熱ローラ141Bと141C、あるいは、加熱ローラ141Cと141Dは同じ曲率であってもよい。 For example, in the present embodiment, the heating rollers 141A and 141B, the heating rollers 141B and 141C, or the heating rollers 141C and 141D may have the same curvature.

また、本実施形態のように媒体110として連続体を使用している場合、媒体110の裏面の全幅が加熱ローラ141と密着しているため、加熱による媒体幅方向(搬送方向と直交する方向)の伸縮が摩擦により抑えられるので、印字部(液体付着部)と非印字部(液体非付着部)間の伸縮差が内部応力となる。 Further, when a continuous body is used as the medium 110 as in the present embodiment, the entire width of the back surface of the medium 110 is in close contact with the heating roller 141, so that the medium width direction due to heating (direction orthogonal to the transport direction). Since the expansion and contraction of the above is suppressed by friction, the difference in expansion and contraction between the printed portion (liquid adhering portion) and the non-printed portion (liquid non-adhering portion) becomes the internal stress.

しかしながら、加熱ローラ141と次段の加熱ローラ141との間で、一旦媒体幅方向の拘束がなくなるので、伸縮差による内部応力が緩和され、次段の加熱ローラ141に接触したときに、より均一化されることで、コックリングの矯正効率が促進される。 However, since the restraint in the medium width direction is once removed between the heating roller 141 and the heating roller 141 in the next stage, the internal stress due to the difference in expansion and contraction is relaxed, and when it comes into contact with the heating roller 141 in the next stage, it becomes more uniform. By making it, the correction efficiency of the cock ring is promoted.

次に、本発明の第2実施形態について図5を参照して説明する。図5は同実施形態の説明に供する要部斜視説明図である。 Next, the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective explanatory view of a main part for explaining the embodiment.

本実施形態では、媒体加熱手段を構成する接触部材として、加熱ローラに代えて、媒体搬送方向に沿って、上流側から曲面ヒータ151A、151Bの順に配置してている。下流側の曲面ヒータ151Bの接触面の曲率は上流側の曲面ヒータ151Aの曲率より小さくしている。 In the present embodiment, as the contact members constituting the medium heating means, curved surface heaters 151A and 151B are arranged in this order from the upstream side along the medium conveying direction instead of the heating rollers. The curvature of the contact surface of the curved surface heater 151B on the downstream side is smaller than the curvature of the curved surface heater 151A on the upstream side.

また、本実施形態では媒体210としてカット紙(シート材)を使用することから、曲面ヒータ151A、151Bの入口側及び出口側などに複数の搬送ローラ143を配置している。 Further, since the cut paper (sheet material) is used as the medium 210 in the present embodiment, a plurality of transport rollers 143 are arranged on the inlet side and the outlet side of the curved surface heaters 151A and 151B.

このように構成したので、液体が付着されて画像300が形成された媒体210は、曲率が相対的に大きい曲面ヒータ151Aの接触面に接触し、曲面ヒータ151の接触面の形状に倣ってコックリングが矯正されるとともに、媒体210の裏面が密着することで加熱乾燥される。 Due to this configuration, the medium 210 on which the liquid is adhered to form the image 300 comes into contact with the contact surface of the curved surface heater 151A having a relatively large curvature, and cocks following the shape of the contact surface of the curved surface heater 151. The ring is straightened, and the back surface of the medium 210 is brought into close contact with the medium to be heated and dried.

この段階で媒体210の液体がある程度乾燥されることで、曲面ヒータ151Aを通過した後に復元するコックリングは初期より小さくなる。 By drying the liquid of the medium 210 to some extent at this stage, the cock ring restored after passing through the curved surface heater 151A becomes smaller than the initial stage.

その後、媒体210は、曲率が相対的に大きい曲面ヒータ151Bの接触面に接触し、曲面ヒータ151Bの接触面の形状に倣ってコックリングが矯正されるとともに、媒体210の裏面が密着することで加熱乾燥される。このとき、曲面ヒータ151Bは曲面ヒータ151Aよりも曲率が小さいので、媒体210との密着時間が長くなり、伝熱を促進されて、乾燥が促進される。この段階で媒体210の液体をさらに乾燥させることで、曲面ヒータ151B通過後に復元するコックリングは前段(曲面ヒータ151通過後)より小さくなる。 After that, the medium 210 comes into contact with the contact surface of the curved surface heater 151B having a relatively large curvature, the cock ring is corrected according to the shape of the contact surface of the curved surface heater 151B, and the back surface of the medium 210 is brought into close contact with each other. It is dried by heating. At this time, since the curved surface heater 151B has a smaller curvature than the curved surface heater 151A, the contact time with the medium 210 becomes longer, heat transfer is promoted, and drying is promoted. By further drying the liquid in the medium 210 at this stage, the cock ring restored after passing through the curved surface heater 151B becomes smaller than that in the previous stage (after passing through the curved surface heater 151).

本実施形態でも、媒体搬送方向で下流側に向かうに従って順に曲率が小さくなる複数の接触部材を配置することで、確実に、コックリングを低減し、乾燥を行うことができる。 Also in the present embodiment, by arranging a plurality of contact members whose curvatures gradually decrease toward the downstream side in the medium transport direction, cockling can be reliably reduced and drying can be performed.

なお、曲面ヒータ151A、151Bの接触面は、坪量100gsm以上の媒体を使用するときには半径R=125mm以下の周面の一部、坪量100gsm未満の媒体を使用するときには半径R=75mm以下の周面の一部とすることが好ましい。 The contact surfaces of the curved surface heaters 151A and 151B are a part of the peripheral surface having a radius R = 125 mm or less when using a medium having a basis weight of 100 gsm or more, and a radius R = 75 mm or less when using a medium having a basis weight of less than 100 gsm. It is preferably a part of the peripheral surface.

ただし、半径Rは均一である必要はなく、最大曲率部が半径=R125mm、あるいは、半径R=75mm以下であれよい。さらに、曲率は、半径R=50mm以下に相当することがコックリング矯正の点からはより好ましい。 However, the radius R does not have to be uniform, and the maximum curvature portion may be a radius = R125 mm or a radius R = 75 mm or less. Further, it is more preferable that the curvature corresponds to the radius R = 50 mm or less from the viewpoint of cockling correction.

媒体がコックリングした場合、接触部材の接触面(加熱面)と0.1mm以上離れると急激に伝熱効率が低下するが、坪量100gsm以上では半径=R125mm・R100mmで密着し、坪量100gsm未満で半径R=75mm/R50で密着することを確認した。 When the medium is cocked, the heat transfer efficiency drops sharply when it is separated from the contact surface (heating surface) of the contact member by 0.1 mm or more, but when the basis weight is 100 gsm or more, the medium adheres with a radius of R125 mm / R100 mm and the basis weight is less than 100 gsm. It was confirmed that the particles adhere to each other with a radius of R = 75 mm / R50.

例えば、坪量90gsmのコート紙では曲率をR50にすることで加熱面との距離は0.02mm以下となる。 For example, in coated paper having a basis weight of 90 gsm, the distance from the heating surface is 0.02 mm or less by setting the curvature to R50.

次に、本発明の第3実施形態について図6を参照して説明する。図6は同実施形態の説明に供する要部斜視説明図である。 Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective explanatory view of a main part for explaining the embodiment.

本実施形態では、媒体加熱手段を構成する接触部材として、媒体搬送方向に沿って、上流側から加熱ローラ161A、161Bの順に配置してている。下流側の加熱ローラ161Bの接触面の曲率は上流側の加熱ローラ161Aの曲率より小さくしている。 In the present embodiment, the heating rollers 161A and 161B are arranged in this order from the upstream side along the medium transport direction as the contact members constituting the medium heating means. The curvature of the contact surface of the heating roller 161B on the downstream side is smaller than the curvature of the heating roller 161A on the upstream side.

また、本実施形態でも媒体210としてカット紙(シート材)を使用することから、加熱ローラ161A、161Bの入口側及び出口側などに複数の搬送ローラ143を配置している。 Further, since the cut paper (sheet material) is used as the medium 210 in this embodiment as well, a plurality of transport rollers 143 are arranged on the inlet side and the outlet side of the heating rollers 161A and 161B.

このように構成したので、媒体210は、曲率が相対的に大きい加熱ローラ161Aの周面に接触し、加熱ローラ161Aの周面形状に倣ってコックリングが矯正されるとともに、媒体210の裏面が密着することで加熱乾燥される。 With this configuration, the medium 210 comes into contact with the peripheral surface of the heating roller 161A having a relatively large curvature, the cock ring is corrected according to the peripheral surface shape of the heating roller 161A, and the back surface of the medium 210 is formed. It is heated and dried by being in close contact.

この段階で媒体210の液体がある程度乾燥されることで、加熱ローラ161Aを通過した後に復元するコックリングは初期より小さくなる。 At this stage, the liquid in the medium 210 is dried to some extent, so that the cock ring restored after passing through the heating roller 161A becomes smaller than the initial one.

その後、媒体210は、曲率が相対的に小さい加熱ローラ161Bの周面に接触し、加熱ローラ161Bの周面形状に倣ってコックリングが矯正されるとともに、媒体210の裏面が密着することで加熱乾燥される。このとき、加熱ローラ161Bは加熱ローラ161Aよりも曲率が小さいので、媒体210との密着時間が長くなり、伝熱を促進されて、乾燥が促進される。この段階で媒体210の液体をさらに乾燥させることで、加熱ローラ161B通過後に復元するコックリングは前段(加熱ローラ161A通過後)より小さくなる。 After that, the medium 210 comes into contact with the peripheral surface of the heating roller 161B having a relatively small curvature, the cock ring is corrected according to the peripheral surface shape of the heating roller 161B, and the back surface of the medium 210 is brought into close contact with the medium 210 for heating. To be dried. At this time, since the heating roller 161B has a smaller curvature than the heating roller 161A, the adhesion time with the medium 210 becomes longer, heat transfer is promoted, and drying is promoted. By further drying the liquid of the medium 210 at this stage, the cock ring restored after passing through the heating roller 161B becomes smaller than that in the previous stage (after passing through the heating roller 161A).

本実施形態でも、媒体搬送方向で下流側に向かうに従って順に曲率が小さくなる複数の接触部材を配置することで、確実に、コックリングを低減し、乾燥を行うことができる。 Also in the present embodiment, by arranging a plurality of contact members whose curvatures gradually decrease toward the downstream side in the medium transport direction, cockling can be reliably reduced and drying can be performed.

なお、加熱ローラ161A、161Bは、坪量100gsm以上の媒体を使用するときには直径φ=250mm以下、坪量100gsm未満の媒体を使用するときには直径φ=150以下であることが好ましい。また、曲率は直径φ=100mm以下とすることがコックリング矯正の点から好ましく、ローラ幅589mmの場合、強度(たわみ)の点からは直径φ=30mm以上であることが好ましい。 The heating rollers 161A and 161B preferably have a diameter of φ = 250 mm or less when using a medium having a basis weight of 100 gsm or more, and a diameter of φ = 150 or less when using a medium having a basis weight of less than 100 gsm. The curvature is preferably φ = 100 mm or less in diameter from the viewpoint of cockling correction, and when the roller width is 589 mm, the diameter is preferably φ = 30 mm or more from the viewpoint of strength (deflection).

次に、本発明の第4実施形態について図7を参照して説明する。図7は同実施形態の説明に供する要部斜視説明図である。 Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective explanatory view of a main part for explaining the embodiment.

本実施形態では、前記第2実施形態における曲面ヒータ151A、151Bの接触面によって加熱される媒体210の領域に対して温風を吹き付ける温風吹付け手段130をそれぞれ配置している。 In the present embodiment, the warm air blowing means 130 for blowing warm air to the region of the medium 210 heated by the contact surfaces of the curved surface heaters 151A and 151B in the second embodiment is arranged.

このように構成したので、媒体210は、曲面ヒータ161A、161Bによって加熱されるとともに、温風吹付け手段130から吹き出される温風によって加熱される。同時に、蒸発した液体の溶剤が媒体210の表面で形成する温度境界層が薄くなって伝熱が促進される。 With this configuration, the medium 210 is heated by the curved surface heaters 161A and 161B and by the warm air blown from the warm air blowing means 130. At the same time, the temperature boundary layer formed by the evaporated liquid solvent on the surface of the medium 210 becomes thin, and heat transfer is promoted.

これにより、より効率的に媒体210を乾燥させることができる。 As a result, the medium 210 can be dried more efficiently.

なお、温風吹付け手段130から吹き出す温風は媒体210の表面における媒体210との相対速度が20m/s以上になる速度で吹き出すことが好ましい。これによって、蒸発した溶剤が媒体の表面側で形成する温度境界層をより確実に剥離壊することができ、伝熱を促進することができる。 The warm air blown from the warm air blowing means 130 is preferably blown at a speed at which the relative speed with respect to the medium 210 on the surface of the medium 210 is 20 m / s or more. As a result, the temperature boundary layer formed on the surface side of the medium by the evaporated solvent can be more reliably peeled off and broken, and heat transfer can be promoted.

次に、本発明の第5実施形態について図8を参照して説明する。図8は同実施形態の説明に供する要部斜視説明図である。 Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a perspective explanatory view of a main part for explaining the embodiment.

本実施形態では、前記第1実施形態における加熱ローラ141A〜141Dの接触面(周面)によって加熱される媒体110の領域に対して温風を吹き付ける温風吹付け手段130をそれぞれ配置している。 In the present embodiment, the warm air blowing means 130 for blowing warm air to the region of the medium 110 heated by the contact surfaces (peripheral surfaces) of the heating rollers 141A to 141D in the first embodiment are arranged.

これにより、前記第4実施形態と同様に、媒体110は、加熱ローラ141A〜141!Dで加熱されるとともに、温風吹付け手段130から吹き出される温風によって加熱される。同時に、蒸発した液体の溶剤が媒体110の表面で形成する温度境界層が薄くなって伝熱が促進される。 As a result, as in the fourth embodiment, the medium 110 is the heating rollers 141A to 141! It is heated by D and is heated by the warm air blown from the hot air blowing means 130. At the same time, the temperature boundary layer formed by the evaporated liquid solvent on the surface of the medium 110 becomes thin, and heat transfer is promoted.

これにより、より効率的に媒体110を乾燥させることができる。 Thereby, the medium 110 can be dried more efficiently.

なお、ここでも、温風吹付け手段130から吹き出す温風は媒体110の表面における媒体110との相対速度が20m/s以上になる速度で吹き出すことが好ましい。これによって、蒸発した溶剤が媒体の表面側で形成する温度境界層をより確実に剥離壊することができ、伝熱を促進することができる。 Again, it is preferable that the warm air blown from the warm air blowing means 130 is blown at a speed at which the relative speed with respect to the medium 110 on the surface of the medium 110 is 20 m / s or more. As a result, the temperature boundary layer formed on the surface side of the medium by the evaporated solvent can be more reliably peeled off and broken, and heat transfer can be promoted.

なお、本願において、媒体は、用紙、被記録媒体、記録媒体、記録紙、記録用紙などは同義とし、同様に、画像形成、記録、印字、印写、印刷は同義とする。 In the present application, as the medium, paper, recording medium, recording medium, recording paper, recording paper, etc. are synonymous, and similarly, image formation, recording, printing, printing, and printing are synonymous.

また、「画像形成装置」は媒体に液体を吐出して画像形成を行う装置を意味する。また、「画像形成」とは、文字や図形等の意味を持つ画像を媒体に対して付与することだけでなく、パターン等の意味を持たない画像を媒体に付与すること(単に液滴を媒体に着弾させること)をも意味する。 Further, the "image forming apparatus" means an apparatus for forming an image by ejecting a liquid into a medium. Further, "image formation" is not only to give an image having meaning such as characters and figures to a medium, but also to give an image having no meaning such as a pattern to the medium (simply giving a droplet as a medium). It also means (to land on).

また、画像形成装置には、特に限定しない限り、シリアル型画像形成装置及びライン型画像形成装置のいずれも含まれる。 Further, the image forming apparatus includes both a serial type image forming apparatus and a line type image forming apparatus unless otherwise specified.

101 画像形成部
103 搬送部
104 乾燥装置
130 温風吹付け手段
141A〜141D、161A、161B 加熱ローラ
151A、151B 曲面ヒータ
200 接触面
201 接触範囲
101 Image forming part 103 Conveying part 104 Drying device 130 Hot air blowing means 141A to 141D, 161A, 161B Heating rollers 151A, 151B Curved surface heater 200 Contact surface 201 Contact range

Claims (12)

媒体の液体が付着され画像形成された面とは反対の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱される
ことを特徴とする乾燥装置。
It has a medium heating means for heating the medium by contacting the surface opposite to the surface on which the liquid of the medium is attached and the image is formed.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. A drying device characterized in that it is contacted and heated.
媒体の液体が付着された面と反対側の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱され、
前記曲率が大きい前記接触加熱部材が複数並べられている
ことを特徴とする乾燥装置。
A medium heating means for heating the medium by contacting the surface opposite to the surface to which the liquid of the medium is attached is provided.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. Contact and heat,
A drying device characterized in that a plurality of the contact heating members having a large curvature are arranged.
前記曲率が大きい複数の接触加熱部材は、互いに同じ曲率である
ことを特徴とする請求項2に記載の乾燥装置。
The drying apparatus according to claim 2, wherein the plurality of contact heating members having a large curvature have the same curvature to each other.
媒体の液体が付着された面と反対側の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱され、
前記曲率が小さい前記接触加熱部材が複数並べられている
ことを特徴とする乾燥装置。
A medium heating means for heating the medium by contacting the surface opposite to the surface to which the liquid of the medium is attached is provided.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. Contact and heat,
A drying device characterized in that a plurality of the contact heating members having a small curvature are arranged.
前記曲率が小さい複数の接触加熱部材は、互いに同じ曲率である
ことを特徴とする請求項4に記載の乾燥装置。
The drying apparatus according to claim 4, wherein the plurality of contact heating members having a small curvature have the same curvature to each other.
媒体の液体が付着され画像形成された面とは反対の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱され、
前記曲率が大きい前記接触加熱部材は、半径Rが30mm以上125mm以下の接触面を有している
ことを特徴とする乾燥装置。
It has a medium heating means for heating the medium by contacting the surface opposite to the surface on which the liquid of the medium is attached and the image is formed.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated by contacting the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. Contact and heat,
The drying apparatus, wherein the contact heating member having a large curvature has a contact surface having a radius R of 30 mm or more and 125 mm or less.
媒体の液体が付着され画像形成された面とは反対の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材の湾曲した接触面に倣って接触して加熱された後、前記曲率が小さい前記接触加熱部材の湾曲した接触面に倣って接触して加熱される
ことを特徴とする乾燥装置。
It has a medium heating means for heating the medium by contacting the surface opposite to the surface on which the liquid of the medium is attached and the image is formed.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated by contacting at least two of the contact heating members among the plurality of contact heating members in accordance with the curved contact surface of the contact heating member having a large curvature, and then the curvature. A drying device characterized in that the contact heating member is heated in contact with the curved contact surface of the contact heating member.
媒体の液体が付着され画像形成された面とは反対の面に接触して、前記媒体を加熱する媒体加熱手段を有し、
前記媒体加熱手段は、前記媒体と接触する曲面である接触面の曲率が異なる複数の接触加熱部材を含み、
前記媒体が、前記複数の接触加熱部材の内の少なくとも2つの前記接触加熱部材に対して、前記曲率が大きい前記接触加熱部材に接触して加熱された後、前記曲率が小さい前記接触加熱部材に接触して加熱され、
前記複数の接触加熱部材は内部に熱源が配置されている
ことを特徴とする乾燥装置。
It has a medium heating means for heating the medium by contacting the surface opposite to the surface on which the liquid of the medium is attached and the image is formed.
The medium heating means includes a plurality of contact heating members having different curvatures of contact surfaces which are curved surfaces in contact with the medium.
The medium is heated in contact with the contact heating member having a large curvature with respect to at least two of the contact heating members among the plurality of contact heating members, and then the contact heating member having a small curvature is formed. Contact and heat,
The drying apparatus, wherein the plurality of contact heating members have a heat source arranged inside.
前記曲率が小さい前記接触加熱部材に前記媒体が接触した後、前記媒体の液体が付着された面に接触して、前記媒体を案内する案内ローラを有する
ことを特徴とする請求項1ないし8のいずれかに記載の乾燥装置。
The first to eighth aspects of claim 1 to 8, wherein after the medium comes into contact with the contact heating member having a small curvature, the medium comes into contact with a surface to which the liquid of the medium is attached to guide the medium. The drying apparatus according to any one.
前記複数の接触加熱部材は、加熱ローラ又は曲面ヒータである
ことを特徴とする請求項1ないし9のいずれかに記載の乾燥装置。
The drying apparatus according to any one of claims 1 to 9, wherein the plurality of contact heating members are a heating roller or a curved surface heater.
隣り合う前記接触加熱部材は、間隔を置いて配置されている The adjacent contact heating members are arranged at intervals.
ことを特徴とする請求項1ないし10のいずれかに記載の乾燥装置。The drying apparatus according to any one of claims 1 to 10.
媒体に対して液体を吐出する手段と、
前記媒体を乾燥する請求項1ないし11のいずれかに記載の乾燥装置と、を備えている
ことを特徴とする印刷装置。
Means for discharging liquid to the medium and
A printing apparatus comprising the drying apparatus according to any one of claims 1 to 11 , wherein the medium is dried.
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