JP2001066931A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP2001066931A JP2001066931A JP24313899A JP24313899A JP2001066931A JP 2001066931 A JP2001066931 A JP 2001066931A JP 24313899 A JP24313899 A JP 24313899A JP 24313899 A JP24313899 A JP 24313899A JP 2001066931 A JP2001066931 A JP 2001066931A
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- transfer
- fixing
- auxiliary guide
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電子写真におけ
る画像形成装置に関する。The present invention relates to an image forming apparatus for electrophotography.
【０００２】[0002]
【従来の技術】画像形成装置において、転写紙として剛
性の高い厚紙を使用することがあるが、その定着時に転
写部と定着部との距離が厚紙の長さよりも短いと、厚紙
が定着部のニップ部に突入する際のショックが厚紙を伝
わって、転写中の画像を乱してしまう、いわゆる画像ぶ
れが発生するという問題がある。特に近年フルカラー複
写機等での厚紙の需要、特に260ｇ/ｍ2程度までの超厚
紙の需要が高まっており、画像形成装置が小スペースと
なると前記の問題がより発生し易くなってしまう。2. Description of the Related Art In an image forming apparatus, thick paper having high rigidity may be used as transfer paper. However, if the distance between the transfer section and the fixing section is shorter than the length of the thick paper at the time of fixing, the thick paper will There is a problem that a shock at the time of entering the nip portion is transmitted through the thick paper and disturbs an image being transferred, that is, a so-called image blur occurs. In particular, in recent years, the demand for thick paper in full-color copying machines and the like, particularly the demand for ultra-thick paper up to about 260 g / m 2 , has been increasing. If the image forming apparatus has a small space, the above problem is more likely to occur.
【０００３】そこで転写ぶれの発生を防止するために、
定着ニップ部への突入時のショックを低減させるため
に、定着部の入口ガイド板の位置を高くして、厚紙の搬
送経路を持ち上げ、ニップ部と入口ガイド板との間でシ
ョックを吸収させることで、転写部にショックを伝える
ことがないようにしたものが、特開平10-301346号公報
にみられるように提案されている。In order to prevent the occurrence of transfer blur,
To reduce the shock at the time of entering the fixing nip, raise the position of the entrance guide plate of the fixing unit, raise the thick paper transport path, and absorb the shock between the nip and the entrance guide plate. Japanese Patent Application Laid-Open No. H10-301346 proposes a configuration in which a shock is not transmitted to a transfer portion.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うなものにおいて、前記のような超厚紙に対応しようと
すると、入口ガイド板の高さをさらに高くしないと、十
分な効果を発揮することができず、その結果としてはが
き等の小サイズ厚紙は、入口ガイド板の先端部にひっか
かって、定着ニップ部に進入することができないで、ジ
ャムを発生し易くなって搬送性を低下させるというな問
題がある。However, in such a case, in order to cope with the above-mentioned super cardboard, a sufficient effect can be exhibited unless the height of the entrance guide plate is further increased. As a result, small-sized thick paper such as a postcard is caught by the leading end of the entrance guide plate and cannot enter the fixing nip, so that a jam easily occurs and the transportability is reduced. is there.
【０００５】そこでこの発明の目的は、前記のような従
来の画像形成装置のもつ問題を解消し、超厚紙の場合で
も定着部への突入時のショックを低減させることが容易
であって、転写部にショックを伝えることがなく、また
小サイズ厚紙の場合にも該厚紙が入口ガイド板の先端部
にひっかかることがなくて、定着部への進入が容易であ
って、ジャムを発生することのない画像形成装置を提供
するにある。Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional image forming apparatus, and to easily reduce the shock at the time of entering the fixing section even in the case of ultra-thick paper. The paper does not transmit a shock to the paper, and even in the case of a small-sized cardboard, the cardboard does not catch on the leading end of the entrance guide plate, so that it can easily enter the fixing section and cause a jam. There is no image forming apparatus.
【０００６】[0006]
【課題を解決するための手段】この発明は、転写部から
ローラ対を有する定着部までの間がシートの最大長より
も短く、厚紙通紙可能な画像形成装置において、請求項
１に記載の発明は、定着部の入口ガイド板の先端部の高
さが、定着部と転写部を結んだ接線よりも高い位置にあ
り、かつ入口ガイド板は先端部よりも通紙の上流側の一
部が分割された補助ガイド板を有し、補助ガイド板の先
端部は入口ガイド板の先端部よりも高い位置に切換可能
となっていることを特徴とし、定着部の入口ガイド板の
一部の高さを切換えて画像ぶれを防止する。According to the present invention, there is provided an image forming apparatus according to claim 1, wherein a distance from a transfer section to a fixing section having a pair of rollers is shorter than a maximum length of a sheet, and thick paper can be passed. According to the invention, the height of the leading end of the entrance guide plate of the fixing unit is higher than a tangent line connecting the fixing unit and the transfer unit, and the entrance guide plate is a part of the upstream side of the paper passing from the leading end. Has a divided auxiliary guide plate, wherein the tip of the auxiliary guide plate can be switched to a position higher than the tip of the entrance guide plate. Switching the height prevents image blurring.
【０００７】請求項２に記載の発明は、請求項１に記載
の発明において、補助ガイド板は切換時、弾性をもつス
ライダの一部によって押し上げられることを特徴とし、
画像ぶれをより効果的に防止する。According to a second aspect of the present invention, in the first aspect of the invention, the auxiliary guide plate is pushed up by a part of an elastic slider when switching.
Image blur is more effectively prevented.
【０００８】請求項３に記載の発明は、請求項１又は２
に記載の発明において、搬送部は弾性体の搬送ベルトを
有し、搬送ベルト端部には等間隔の突起が設けられてい
ることを特徴とし、補助ガイド板切換時でも小サイズ紙
の搬送性を確保する。[0008] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described in (1), the transport section has an elastic transport belt, and the transport belt has end portions provided with equally spaced projections. To secure.
【０００９】[0009]
【発明の実施の形態】図面に示すこの本発明の実施例に
おいて、１は転写手段、２は搬送手段、３は定着手段を
示し、転写手段１は転写部４を有し、搬送手段２は搬送
ベルト６を有し、定着手段３は定着ローラ７及びこれ当
接して定着部９を構成している加圧ローラ８を有し、こ
れらの両ローラ７，８はともに弾性体層を有し、それぞ
れ内部にヒータを具えている。そして転写部４と定着部
９との間には、搬送ベルト６が移動するほぼ直線状の搬
送経路12が形成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in the drawings, reference numeral 1 denotes transfer means, 2 denotes transport means, 3 denotes fixing means, transfer means 1 has a transfer section 4, and transport means 2 The fixing unit 3 includes a fixing roller 7 and a pressure roller 8 that comes into contact with the fixing belt 9 to form a fixing unit 9. Both of the rollers 7 and 8 have an elastic layer. , Each having a heater inside. A substantially linear transport path 12 through which the transport belt 6 moves is formed between the transfer section 4 and the fixing section 9.
【００１０】定着手段３の入口には、図４に示すような
入口ガイド板10が設けられており、この入口ガイド板10
は逆Ｌ字形となっていて、その横向部分14の中央部16
は、その両側部分よりも突出しており、この中央部16は
図２に示すように、搬送経路12よりも先端部が高く設定
されている。中央部16の先端部がこのように搬送経路12
よりも高く位置設定されていることから、従来のものと
同様にして、転写紙の定着しわや後端はねあがりの発生
を防止することとなる。At the entrance of the fixing means 3, an entrance guide plate 10 as shown in FIG.
Is an inverted L-shape, and the central portion 16 of the lateral portion 14 is
The center portion 16 is set to be higher at the tip end than the transport path 12 as shown in FIG. The leading end of the central portion 16 is thus
Since the position is set higher than in the related art, it is possible to prevent occurrence of wrinkles in the fixing of the transfer paper and splashing of the rear end in the same manner as in the related art.
【００１１】また、入口ガイド板10には、図４に示すよ
うにほぼ中央の屈曲部に切欠部18が設けられ、この切欠
部18の縦向の縁部19の内側にブラケット20が設けられ、
このブラケット20に透孔21が設けられている。そして切
欠部18に補助ガイド板11が回動可能に取り付けられてい
る。この補助ガイド板11は、縦向部22と斜向部23とを有
し、縦向部22に内向きであって透孔25が設けられている
支承板24が突設されて入る。そしてこの補助ガイド板11
は、両透孔21，25を貫通したボルト26によって、前記の
ように入口ガイド板10に回動可能に取り付けられること
になる。As shown in FIG. 4, the inlet guide plate 10 is provided with a notch 18 at a substantially central bent portion, and a bracket 20 is provided inside a vertical edge 19 of the notch 18. ,
The bracket 20 has a through hole 21. The auxiliary guide plate 11 is rotatably attached to the notch 18. The auxiliary guide plate 11 has a vertical portion 22 and an oblique portion 23, and a support plate 24, which is inwardly provided with the through hole 25 and is provided in the vertical portion 22, protrudes into the auxiliary guide plate 11. And this auxiliary guide plate 11
Is rotatably attached to the entrance guide plate 10 by the bolts 26 penetrating the through holes 21 and 25 as described above.
【００１２】入口ガイド板10の横向部分14には、切欠部
18に面した凹部27が設けられ、この凹部27は補助ガイド
板11の斜向部23が嵌入するようになっている。補助ガイ
ド板11の縦向部22を覆って横方向に摺動するスライダ28
が設けられ、このスライダ28の補助ガイド板11と対向す
る部分にテーパ状部を有するカム部29が設けられてお
り、その両側に横方向の長孔31が設けられている。そし
てこの長孔31に段ビス32を挿通して、入口ガイド板10の
壁面に設けられたねじ孔33に捩じ込むことによってスラ
イダ28を横方向に移動させ、この移動によってカム部29
により、これに係合している補助ガイド板11をボルト26
を中心にして回動させ、斜向部23の先端部を図２に示す
ように、実線位置と鎖線位置との間を移動させることと
なる。このようにして補助ガイド板11は、その先端が最
下位位置とされた場合には、その斜向部23が入口ガイド
板10の凹部27に嵌入して、入口ガイド板10の横向部分14
と同一ガイド面を形成できるようになっている。The lateral portion 14 of the entrance guide plate 10 has a notch
A concave portion 27 facing 18 is provided, and the concave portion 27 is adapted to fit the oblique portion 23 of the auxiliary guide plate 11. Slider 28 that slides laterally over vertical portion 22 of auxiliary guide plate 11
A cam portion 29 having a tapered portion is provided on a portion of the slider 28 facing the auxiliary guide plate 11, and a long slot 31 in the lateral direction is provided on both sides thereof. Then, a step screw 32 is inserted into the elongated hole 31 and screwed into a screw hole 33 provided on the wall surface of the entrance guide plate 10 to move the slider 28 in the lateral direction.
As a result, the auxiliary guide plate 11 engaged with the
, The tip of the oblique portion 23 is moved between the solid line position and the chain line position as shown in FIG. In this way, when the front end of the auxiliary guide plate 11 is at the lowest position, the oblique portion 23 is fitted into the concave portion 27 of the entrance guide plate 10 and the lateral portion 14 of the entrance guide plate 10 is
And the same guide surface can be formed.
【００１３】図５，６には、搬送ベルト６の他例が示さ
れており、この搬送ベルト６は一側端部に複数の突起34
が所定の間隔をおいて設けられており、図６に示すよう
に厚紙小サイズの転写紙Ｐの後端部分を突起34によって
定着部９に押込んでいる。これは補助ガイド板11が上方
にあっても、直線状の搬送経路12となす角度θ′によっ
て、転写紙Ｐの後端部が搬送ベルト６の突起34に引っ掛
るので、はがき等の小サイズ厚紙のジャムを防止するこ
とになる。FIGS. 5 and 6 show another example of the conveyor belt 6. The conveyor belt 6 has a plurality of protrusions 34 at one end.
Are provided at predetermined intervals, and the rear end portion of the transfer sheet P having a small size of thick paper is pushed into the fixing unit 9 by the projection 34 as shown in FIG. This is because even when the auxiliary guide plate 11 is located above, the rear end of the transfer paper P is caught by the projection 34 of the transport belt 6 due to the angle θ ′ formed with the linear transport path 12, so that a small postcard or the like can be used. This prevents thick paper jams.
【００１４】前記のようなものにおいて、転写紙Ｐは転
写手段１の転写部４で転写されて、搬送手段２の搬送ベ
ルト６によって、ほぼ直線状の搬送経路12に沿って定着
ローラ７と加圧ローラ８との定着部９に搬送され、ここ
で定着が行われる。この場合において、転写紙Ｐの長さ
が図１に示すように、転写部４と定着部９との間の距離
Ｌより大きい場合には、スライダ28を移動してそのカム
部29によって、補助ガイド板11は縦向部22の下部が押さ
れて、先端が上方に持ち上り、図２に示すように位置11
−１，11−２，11−３に変位する。この場合スライダ28
はステンレス等のばね部材でできているので、そのクッ
ション性によって、転写紙Ｐの突入時のショックを低減
することとなる。なお、補助ガイド板11自体がばね部材
であっても同様のクッション性を得ることができ、同様
な効果が得られる。In the above-described configuration, the transfer paper P is transferred by the transfer section 4 of the transfer means 1, and is transferred to the fixing roller 7 by the transfer belt 6 of the transfer means 2 along a substantially linear transfer path 12. The sheet is conveyed to a fixing section 9 with the pressure roller 8, where the fixing is performed. In this case, when the length of the transfer paper P is larger than the distance L between the transfer unit 4 and the fixing unit 9 as shown in FIG. The guide plate 11 is pushed downward at the lower part of the vertical portion 22, and its tip is lifted upward, as shown in FIG.
-1, 11-2, 11-3. In this case slider 28
Is made of a spring member such as stainless steel, so that the shock at the time when the transfer paper P enters can be reduced by its cushioning property. Even if the auxiliary guide plate 11 itself is a spring member, the same cushioning property can be obtained, and the same effect can be obtained.
【００１５】前記のようにして補助ガイド板11を設定す
ることによって、搬送経路12と角度θをなす直線35が、
厚紙対応時の補助ガイド板11の先端高さの設定位置11−
１，２，３である。これによると、補助ガイド板11の先
端位置は通紙上流側にいくに従って高くなる。これは、
厚紙転写紙Ｐの先端がニップに突入したときのショック
を補助ガイド板11の先端位置の部分で吸収させるために
は、定着部９から遠ざかって通紙上流側にいくに従っ
て、より高く設定しなければ同様な効果が得られないか
らである。また、図３に示すように、補助ガイド板11の
先端をｈ2＞ｈ1となるように、ｈ1からｈ2へと上流側に
遠ざけることで、補助ガイド板11の先端高さの設定幅を
大きくとる事ができ、部品ばらつきに対して有利とな
る。By setting the auxiliary guide plate 11 as described above, a straight line 35 that forms an angle θ with the transport path 12 becomes
Setting position of tip height of auxiliary guide plate 11 for thick paper
1, 2, and 3. According to this, the leading end position of the auxiliary guide plate 11 becomes higher toward the upstream side of the sheet passing. this is,
In order to absorb the shock when the leading end of the thick paper transfer sheet P enters the nip at the leading end position of the auxiliary guide plate 11, the distance must be set higher as the distance from the fixing unit 9 increases to the upstream side of the paper passage. This is because a similar effect cannot be obtained. Further, as shown in FIG. 3, the tip of the auxiliary guide plate 11 so that h 2> h 1, that away from h 1 to h 2 on the upstream side, setting of the tip height of the auxiliary guide plate 11 The width can be made large, which is advantageous for component variations.
【００１６】また、厚紙がニップに突入した瞬間、補助
ガイド板11の先端部に適度にクッション性を持たせるこ
とで突入ショックを和らげて、より効果が高まる。Further, at the moment when the thick paper enters the nip, the leading end of the auxiliary guide plate 11 is provided with an appropriate cushioning property, so that the entry shock is reduced and the effect is further enhanced.
【００１７】[0017]
【発明の効果】この発明は、前記のようであって、転写
部からローラ対を有する定着部までの間がシート最大長
よりも短く、厚紙通紙可能な画像形成装置において、請
求項１に記載の発明は、定着部の入口ガイド板の一部を
分割として先端を上流側に遠ざけることで、厚紙の突入
時のショックを和らげ、画像ぶれを防止させると同時に
補助ガイド先端高さの設定幅を大きくとる事ができ、部
品ばらつきに対して、有利となる。According to the present invention, there is provided an image forming apparatus as described above, wherein the distance from the transfer section to the fixing section having a pair of rollers is shorter than the maximum sheet length, and thick paper can be passed. According to the invention described above, by dividing a part of the entrance guide plate of the fixing unit and separating the leading end to the upstream side, the shock at the time of entering thick paper is relieved, image blur is prevented, and at the same time, the setting width of the auxiliary guide leading end height is set. Can be made large, which is advantageous for component variations.
【００１８】請求項２に記載の発明は、補助ガイド板を
弾性をもつスライダの一部によって押し上げる事で、厚
紙突入時のショックを和らげ、画像ぶれをより効果的に
防止する効果がある。According to the second aspect of the present invention, the auxiliary guide plate is pushed up by a part of the elastic slider, so that the shock at the time of entering the thick paper is reduced, and the image blur is more effectively prevented.
【００１９】請求項３に記載の発明は、搬送ベルトに突
起を設けることで搬送時、小サイズ紙の後端を押込み、
補助ガイド板が高い状態でも小サイズ紙のジャムを防止
する効果がある。According to a third aspect of the present invention, the rear end of the small-sized paper is pushed in during conveyance by providing a projection on the conveyance belt,
Even when the auxiliary guide plate is high, there is an effect that jamming of small-sized paper is prevented.
【図１】この発明の実施形態の概略正面図である。FIG. 1 is a schematic front view of an embodiment of the present invention.
【図２】同上の補助ガイド板の変位状態を示す説明図で
ある。FIG. 2 is an explanatory diagram showing a displacement state of an auxiliary guide plate according to the first embodiment.
【図３】同補助ガイド板の作用説明図である。FIG. 3 is an operation explanatory view of the auxiliary guide plate.
【図４】同上の入口ガイド板と補助ガイド板との分解図
である。FIG. 4 is an exploded view of the inlet guide plate and the auxiliary guide plate according to the first embodiment.
【図５】同上の搬送手段の斜面図である。FIG. 5 is a perspective view of the conveying means according to the first embodiment.
【図６】同上の要部の正面図である。FIG. 6 is a front view of a main part of the above.
１ 転写手段 ２ 搬送手段 ３ 定着手段 ４ 転写部 ６ 搬送ベルト ７ 定着ローラ ８ 加圧ローラ ９ 定着部 10 入口ガイド板 11 補助ガイド板 12 搬送経路 14 横向部分 16 中央部 18 切欠部 19 縁部 20 ブラケット 21 透孔 22 縦向部 23 斜向部 24 支承板 25 透孔 26 ボルト 27 凹部 28 スライダ 29 カム部 31 長孔 32 段ビス 33 ねじ孔 34 突起 35 直線 DESCRIPTION OF SYMBOLS 1 Transfer means 2 Conveying means 3 Fixing means 4 Transfer part 6 Conveying belt 7 Fixing roller 8 Pressure roller 9 Fixing part 10 Inlet guide plate 11 Auxiliary guide plate 12 Conveyance path 14 Horizontal part 16 Center part 18 Notch part 19 Edge part 20 Bracket 21 Through hole 22 Vertical part 23 Slant part 24 Support plate 25 Through hole 26 Bolt 27 Recess 28 Slider 29 Cam part 31 Long hole 32 Step screw 33 Screw hole 34 Projection 35 Straight
Claims (3)
の間がシート最大長よりも短く、厚紙通紙可能な画像形
成装置において、定着部の入口ガイド板の先端部高さ
が、定着部と転写部とを結んだ接線よりも高い位置にあ
り、かつ入口ガイド板は先端部よりも通紙の上流側の一
部が分割された補助ガイド板を有し、補助ガイド板の先
端部は、入口ガイド板の先端部よりも高い位置に切換可
能となっていることを特徴とする画像形成装置。An image forming apparatus in which a distance from a transfer section to a fixing section having a pair of rollers is shorter than a maximum sheet length, and a height of a leading end of an entrance guide plate of the fixing section is set to a fixing section. And the entrance guide plate has an auxiliary guide plate in which a part of the upstream side of the paper passage is divided from the leading end portion, and the leading end portion of the auxiliary guide plate is An image forming apparatus capable of switching to a position higher than a front end of an entrance guide plate.
イダの一部によって押し上げられることを特徴とする請
求項１に記載の画像形成装置。2. The image forming apparatus according to claim 1, wherein the auxiliary guide plate is pushed up by a part of an elastic slider when switching.
送ベルト端部には等間隔の突起が設けられていることを
特徴とする請求項１又は２に記載の画像形成装置。3. The image forming apparatus according to claim 1, wherein the conveying section has an elastic conveying belt, and the conveying belt has an end provided with projections at regular intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24313899A JP3806552B2 (en) | 1999-08-30 | 1999-08-30 | Image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24313899A JP3806552B2 (en) | 1999-08-30 | 1999-08-30 | Image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001066931A true JP2001066931A (en) | 2001-03-16 |
| JP3806552B2 JP3806552B2 (en) | 2006-08-09 |
Family
ID=17099366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24313899A Expired - Fee Related JP3806552B2 (en) | 1999-08-30 | 1999-08-30 | Image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3806552B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009113928A (en) * | 2007-11-07 | 2009-05-28 | Kyocera Mita Corp | Sheet conveying device and image forming device equipped with the same device |
| US8874021B2 (en) | 2011-06-30 | 2014-10-28 | Ricoh Company, Ltd. | Media guide mechanism, fixing device and image forming apparatus incorporating same |
| US9753416B2 (en) | 2015-05-25 | 2017-09-05 | Ricoh Company, Ltd. | Fixing device including a guide having a roughened face and image forming apparatus |
-
1999
- 1999-08-30 JP JP24313899A patent/JP3806552B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009113928A (en) * | 2007-11-07 | 2009-05-28 | Kyocera Mita Corp | Sheet conveying device and image forming device equipped with the same device |
| US8874021B2 (en) | 2011-06-30 | 2014-10-28 | Ricoh Company, Ltd. | Media guide mechanism, fixing device and image forming apparatus incorporating same |
| US9753416B2 (en) | 2015-05-25 | 2017-09-05 | Ricoh Company, Ltd. | Fixing device including a guide having a roughened face and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3806552B2 (en) | 2006-08-09 |
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