JP2012226211A - Image forming device - Google Patents

Image forming device Download PDF

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JP2012226211A
JP2012226211A JP2011095210A JP2011095210A JP2012226211A JP 2012226211 A JP2012226211 A JP 2012226211A JP 2011095210 A JP2011095210 A JP 2011095210A JP 2011095210 A JP2011095210 A JP 2011095210A JP 2012226211 A JP2012226211 A JP 2012226211A
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peeling claw
photosensitive drum
peeling
recording medium
tip
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JP5687551B2 (en
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Hideyuki Sakamaki
秀行 酒巻
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Oki Data Infotech Corp
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Oki Data Infotech Corp
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Priority to JP2011095210A priority Critical patent/JP5687551B2/en
Priority to PCT/JP2012/053872 priority patent/WO2012144259A1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/657—Feeding path after the transfer point and up to the fixing point, e.g. guides and feeding means for handling copy material carrying an unfused toner image
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00573—Recording medium stripping from image forming member

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device that separates a thin recording medium from a photoreceptor using a peeling claw without damaging the recording medium.SOLUTION: The peeling claw fixed to a frame is formed by gradually tapering a resin flat plate toward the tip to have a fixed thickness in the thickness direction. A plurality of peeling claws are fixed to the frame in a longitudinal direction of a photoreceptor drum. The recording medium can be separated from the photoreceptor regardless of the size of the recording medium. The positional relationship between the peeling claw and the photoreceptor drum can be easily adjusted by moving the frame.

Description

本発明は、画像形成装置に関する。特に感光ドラムから記録媒体を剥離する剥離爪を有する画像形成装置に関する。   The present invention relates to an image forming apparatus. In particular, the present invention relates to an image forming apparatus having a peeling claw for peeling a recording medium from a photosensitive drum.

電子写真方式の画像形成装置が広く知られている。この画像形成装置は、光によって感光ドラムの表面に静電潜像を形成し、この静電潜像に沿って感光ドラム上にトナーを付着させ、付着したトナーを紙などの記録媒体に転写させ、このトナーを定着装置によって記録媒体に定着させる。   An electrophotographic image forming apparatus is widely known. This image forming apparatus forms an electrostatic latent image on the surface of the photosensitive drum by light, adheres toner to the photosensitive drum along the electrostatic latent image, and transfers the adhered toner to a recording medium such as paper. The toner is fixed on the recording medium by a fixing device.

トナーの付着した感光ドラムから記録媒体にトナーを転写させた後に、記録媒体が帯電によって感光ドラムに付着したまま剥がれない場合がある。このような場合のために強制的に感光ドラムから記録媒体を剥離する剥離爪を備えた画像形成装置が知られている。   After the toner is transferred from the photosensitive drum to which the toner is adhered to the recording medium, the recording medium may not be peeled off while being adhered to the photosensitive drum due to charging. For such a case, an image forming apparatus having a peeling claw for forcibly peeling a recording medium from a photosensitive drum is known.

例えば、特開平９−４３９９５号公報のように、剥離爪を、剥離爪本体と保持部材とで構成し、保持部材を介して剥離爪本体をクリーニング装置のハウジングに揺動自在に取付け、剥離爪本体の錘部の自重でもって爪部を感光体ドラム表面に添わせるようにした構成のものが知られている。剥離爪は、樹脂により作られた先端が尖った錘構造になっている。先端を尖らせ、感光ドラムと記録紙の間に先端を押し込むことで記録紙を剥離する構造である。また、剥離爪本体は、樹脂材料から一体成型され、先端に先細りの爪部を、後端に錘部を備える。また、保持部材を弾性変形可能な金属製の薄板から形成しているため、例えば、感光体ドラム周辺での紙詰まりの紙の除去に際して爪部に力が働くような場合であっても、保持部材がこの力に応じて弾性変形することにより、紙の除去を容易に行うことができるとともに、爪部の破損等が阻止される。このような剥離爪を有する画像形成装置が知られている。   For example, as disclosed in Japanese Patent Application Laid-Open No. 9-43995, the peeling claw is constituted by a peeling claw body and a holding member, and the peeling claw body is swingably attached to the housing of the cleaning device via the holding member. There is known a configuration in which the claw portion is attached to the surface of the photosensitive drum by the weight of the weight portion of the main body. The peeling claw has a weight structure with a pointed tip made of resin. The recording paper is peeled off by sharpening the tip and pushing the tip between the photosensitive drum and the recording paper. The peeling claw body is integrally molded from a resin material, and has a tapered claw portion at the front end and a weight portion at the rear end. In addition, since the holding member is formed of a metal thin plate that can be elastically deformed, for example, even when a force is applied to the claw portion when removing a jammed paper around the photosensitive drum, the holding member is held. The member is elastically deformed according to this force, so that the paper can be easily removed and the claw portion is prevented from being damaged. An image forming apparatus having such a peeling claw is known.

特開平９−４３９９５号公報Japanese Patent Laid-Open No. 9-43995

従来の技術は、軸を中心に錘部の自重により剥離爪部を感光ドラムに当接させている。また、爪と保持部の回動部の摩擦は夫々の剥離爪で異なり、複数の剥離爪の当接圧を一律にする調整が難しい。夫々の剥離爪において、感光ドラムへの当て方を調整させる必要があり、製造やメンテナンスをするのに多くの時間がかかってしまう。また、剥離爪は剛体であり、機器の振動などの外因により容易に剥離爪が感光ドラムから離れてしまう場合がある。剥離爪が感光ドラムから離れた状態で記録紙の先端が通過すると紙ジャムが起きる。剥離爪が離れないようにする為には感光ドラムに強く当接する必要があり、感光ドラムを傷つけてしまう恐れがある。また、剥離爪の構造が複雑であり製造、組み立ての工数が多く、作業性が悪い。また、剥離爪の先端を尖らせて錘で付勢しているので、薄い記録紙であり感光ドラムに強力に付着した記録紙の場合に、剥離爪と記録紙の衝突の衝撃で剥離爪が少しでも浮き上がると、剥離爪が記録紙の下に潜り込めずジャムの原因となる恐れがある。   In the conventional technique, the peeling claw portion is brought into contact with the photosensitive drum by the weight of the weight portion around the shaft. In addition, the friction between the claw and the rotating portion of the holding portion is different for each peeling claw, and it is difficult to adjust the contact pressure of the plurality of peeling claws uniformly. In each peeling claw, it is necessary to adjust the method of applying to the photosensitive drum, and it takes a lot of time for manufacturing and maintenance. Further, the peeling claw is a rigid body, and the peeling claw may be easily separated from the photosensitive drum due to external factors such as vibration of the device. If the leading edge of the recording paper passes with the peeling claw away from the photosensitive drum, paper jam occurs. In order to prevent the peeling claw from being separated, it is necessary to make strong contact with the photosensitive drum, which may damage the photosensitive drum. In addition, the structure of the peeling claw is complicated, the number of manufacturing and assembly steps is large, and workability is poor. In addition, since the tip of the peeling claw is sharpened and urged by a weight, when the recording paper is thin and strongly attached to the photosensitive drum, the peeling claw is affected by the impact of the peeling claw and the recording paper. If it floats even a little, the peeling claw may not sink under the recording paper and may cause a jam.

本発明はこのような問題を解決するものであり、単純な構造であるが、複数の剥離爪を容易に一定の当接圧で感光ドラムに当接でき、感光ドラムを傷つけず、薄い記録媒体を用いても確実に感光ドラムから記録媒体を剥離できる画像形成装置を提供する。   The present invention solves such a problem and has a simple structure, but a plurality of peeling claws can be easily brought into contact with the photosensitive drum with a constant contact pressure, and the photosensitive drum is not damaged. An image forming apparatus capable of reliably peeling a recording medium from a photosensitive drum even when using the image forming apparatus is provided.

すなわち本発明の画像形成装置は、表面に形成した静電潜像に応じてトナーを付着させる感光ドラムと、前記感光ドラムに付着した前記トナーを記録媒体に転写する転写器と、前記記録媒体に転写した前記トナーを前記記録媒体に定着させる定着器と、前記感光ドラムに付着した記録媒体を剥離する剥離爪と、前記剥離爪を固定する剥離爪固定フレームと、を有する画像形成装置において、前記剥離爪と前記剥離爪固定フレームとの間に固定される金属平板製の剥離爪固定板を有し、前記剥離爪は前記感光ドラムに接する面が先端方向に向かって漸次細く形成され、かつ厚みが一定に形成された樹脂製の薄板であり、前記剥離爪は前記漸次細く形成された部分であって先端を含む前記先端方向の一部分を除き前記剥離爪固定板に固定され、前記剥離爪固定板は前記剥離爪が固定されている部分の前記漸次細く形成された辺に沿って、前記先端方向に向かって漸次細く形成された傾斜部と前記剥離爪の厚み方向に交差する方向の移動を規制する凸部を備え、前記剥離爪の前記剥離爪固定板に固定されていない部分が前記感光ドラム方向に突出するように湾曲し、前記面が前記感光ドラムに接することを特徴とする。   That is, the image forming apparatus of the present invention includes a photosensitive drum for attaching toner according to an electrostatic latent image formed on the surface, a transfer device for transferring the toner attached to the photosensitive drum to a recording medium, and a recording medium. In the image forming apparatus, comprising: a fixing device that fixes the transferred toner to the recording medium; a peeling claw that peels off the recording medium attached to the photosensitive drum; and a peeling claw fixing frame that fixes the peeling claw. A peeling claw fixing plate made of a metal plate fixed between the peeling claw and the peeling claw fixing frame, the surface of the peeling claw being in contact with the photosensitive drum is formed so as to be gradually narrowed toward the tip, and has a thickness. Is a resin thin plate formed uniformly, and the peeling claw is a gradually narrowed portion and is fixed to the peeling claw fixing plate except for a part in the tip direction including the tip. The peeling claw fixing plate is a direction that intersects with the thickness direction of the peeling claw and the inclined portion that is gradually narrowed toward the tip direction along the side where the peeling claw is fixed to the gradually narrowed side. A convex portion that restricts movement of the peeling claw, a portion of the peeling claw that is not fixed to the peeling claw fixing plate is curved so as to protrude toward the photosensitive drum, and the surface is in contact with the photosensitive drum. To do.

本発明によれば、単純な構造であるが、複数の剥離爪を容易に一定の当接圧で感光ドラムに当接でき、感光ドラムに傷をつけず、薄い記録媒体を用いても確実に感光ドラムから剥離できる。   According to the present invention, although the structure is simple, a plurality of peeling claws can be easily brought into contact with the photosensitive drum with a constant contact pressure, and the photosensitive drum is not damaged and can be reliably used even with a thin recording medium. It can be peeled from the photosensitive drum.

図１は、画像形成装置の概略構成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus. 図２は、剥離爪の配置図である。FIG. 2 is a layout diagram of the peeling claws. 図３は、剥離爪の構成を説明する図である。FIG. 3 is a diagram illustrating the configuration of the peeling claw. 図４は、感光ドラムから記録媒体が剥離される様子を説明する図である。FIG. 4 is a diagram for explaining how the recording medium is peeled from the photosensitive drum.

本発明の実施形態を、図面を使って説明する。
図１は、画像形成装置の概略構成図である。感光ドラム１は円柱状の回転体である。感光ドラム１の表面にトナーを付着させ、搬送されてくる記録媒体４に、そのトナーを転写する。定着器１１は発熱体を内蔵する加熱ローラと、加熱ローラに付勢する加圧ローラを備え、熱と圧力によって記録媒体４にトナーを定着させる。感光ドラム１はＬＥＤヘッド２によって表面に静電潜像を形成し、現像器３によってその静電潜像に対応させてトナーを付着させる。感光ドラム１の表面に付着したトナーは転写器９によって記録媒体４上に付着させる。記録媒体４は紙、フィルム状のプラスチックなどである。記録媒体４は、搬送ローラ１０によって搬送案内板１２に沿って定着器１１に搬送される。搬送ローラ１０は回転するローラとそのローラに押圧され連れ回るローラから構成され、ローラの回転により記録媒体４を搬送する。転写器９によって記録媒体４にトナーが転写されるが、わずかに残るトナーがある。感光ドラム１に残ったトナーはクリーニングユニット６によって取り除かれ、さらに除電される。その後感光ドラム１の表面は帯電器５によって再帯電され、ＬＥＤヘッド２によって所望の画像の静電潜像を形成する。 Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an image forming apparatus. The photosensitive drum 1 is a cylindrical rotating body. Toner is attached to the surface of the photosensitive drum 1 and the toner is transferred to the recording medium 4 being conveyed. The fixing device 11 includes a heating roller containing a heating element and a pressure roller that urges the heating roller, and fixes the toner on the recording medium 4 by heat and pressure. The photosensitive drum 1 forms an electrostatic latent image on the surface by the LED head 2, and a toner is adhered to the photosensitive drum 1 in correspondence with the electrostatic latent image by the developing device 3. The toner attached to the surface of the photosensitive drum 1 is attached to the recording medium 4 by the transfer device 9. The recording medium 4 is paper, film plastic, or the like. The recording medium 4 is transported to the fixing device 11 along the transport guide plate 12 by the transport roller 10. The conveyance roller 10 is composed of a rotating roller and a roller that is rotated by the roller, and conveys the recording medium 4 by the rotation of the roller. The toner is transferred to the recording medium 4 by the transfer device 9, but there is a slight amount of toner remaining. The toner remaining on the photosensitive drum 1 is removed by the cleaning unit 6 and further discharged. Thereafter, the surface of the photosensitive drum 1 is recharged by the charger 5, and an electrostatic latent image of a desired image is formed by the LED head 2.

転写器９を通過した記録媒体４は帯電して感光ドラム１から剥がれずに付着したまま搬送される場合があり、記録媒体４を感光ドラム１から剥離するために剥離爪７が剥離爪固定フレーム８に固定されている。剥離爪７の先端部は感光ドラム１に当接している。感光ドラム１に記録媒体４が付着して搬送された場合に、この剥離爪７によって記録媒体４を感光ドラム１から剥離し、定着器１１に導く。剥離爪固定フレーム８の先端には凹部１８が備わっている。凹部１８は剥離爪固定フレーム８の歪み防止のために備えられ、これによって複数配置され剥離爪７の感光ドラム１への当接圧の調整を容易にしている。剥離爪固定フレーム８に剥離爪固定板１９が固定され、剥離爪固定板１９に剥離爪７が固定されている。剥離爪固定板１９および剥離爪７の固定は、接着剤、粘着テープ等により固定される。また、剥離爪固定フレーム８には記録媒体４が、剥離爪７や剥離爪固定フレーム８に当たらないように拍車１７が備えられている。   The recording medium 4 that has passed through the transfer device 9 is sometimes charged and transported without being peeled off from the photosensitive drum 1. In order to peel off the recording medium 4 from the photosensitive drum 1, the peeling claw 7 has a peeling claw fixing frame. 8 is fixed. The tip of the peeling claw 7 is in contact with the photosensitive drum 1. When the recording medium 4 adheres to the photosensitive drum 1 and is conveyed, the recording medium 4 is peeled off from the photosensitive drum 1 by the peeling claw 7 and guided to the fixing device 11. A recess 18 is provided at the tip of the peeling claw fixing frame 8. The recesses 18 are provided to prevent the peeling claw fixing frame 8 from being distorted, and a plurality of the depressions 18 are arranged to facilitate adjustment of the contact pressure of the peeling claw 7 to the photosensitive drum 1. A peeling claw fixing plate 19 is fixed to the peeling claw fixing frame 8, and the peeling claw 7 is fixed to the peeling claw fixing plate 19. The peeling claw fixing plate 19 and the peeling claw 7 are fixed by an adhesive, an adhesive tape, or the like. The peeling claw fixing frame 8 is provided with a spur 17 so that the recording medium 4 does not hit the peeling claw 7 or the peeling claw fixing frame 8.

剥離爪７と感光ドラム１との位置関係の例を示す。感光ドラム１の直径は６０ｍｍである。感光ドラム１の外周下端と剥離爪７の配置の垂直方向の差１３が２．４ｍｍ以上３．４ｍｍ以下である。また、剥離爪７は先端が感光ドラム１に接触するように湾曲して配置されている。点線で示した剥離爪の位置１６は、感光ドラム１が無かった場合の位置を示している。剥離爪７が感光ドラム１と重なる長さ１４が１．０ｍｍ以上２．０ｍｍ以下である。当接部１５は、剥離爪固定フレーム８に固定されている剥離爪７が、記録媒体４と衝突した時の衝撃により、移動することを防止するために備えられた突起である。   An example of the positional relationship between the peeling claw 7 and the photosensitive drum 1 is shown. The diameter of the photosensitive drum 1 is 60 mm. The difference 13 in the vertical direction between the lower end of the outer periphery of the photosensitive drum 1 and the separation claw 7 is not less than 2.4 mm and not more than 3.4 mm. Further, the peeling claw 7 is arranged so as to be curved so that the tip contacts the photosensitive drum 1. A peeling claw position 16 indicated by a dotted line indicates a position when the photosensitive drum 1 is not present. The length 14 at which the peeling claw 7 overlaps the photosensitive drum 1 is 1.0 mm or more and 2.0 mm or less. The contact portion 15 is a protrusion provided to prevent the peeling claw 7 fixed to the peeling claw fixing frame 8 from moving due to an impact when it collides with the recording medium 4.

剥離爪７は感光ドラム１の外周の下端の接線方向と平行に配置されている。これにより下端からの高さ及び接触角の調整を容易にしている。これは、鉛直方向に抗して剥離爪７の先端を感光ドラム１に押し当てている。剥離爪７は先端に行くに従い曲率が大きくなる。剥離爪７は面で感光ドラム１に接している。これは剥離爪７が樹脂の薄板であり、ある程度柔軟性があるので、先端部を含む面接触ができる。面で感光ドラム１に当たっているので、接触力が強く、記録媒体４との衝突時に捲りあがることが無い。また、感光ドラム１を傷つけることも無い。   The peeling claw 7 is arranged in parallel to the tangential direction of the lower end of the outer periphery of the photosensitive drum 1. This facilitates adjustment of the height from the lower end and the contact angle. This presses the tip of the peeling claw 7 against the photosensitive drum 1 against the vertical direction. The curvature of the peeling claw 7 increases as it goes to the tip. The peeling claw 7 is in contact with the photosensitive drum 1 at the surface. This is because the peeling claw 7 is a resin thin plate and is flexible to some extent, so that surface contact including the tip can be made. Since the surface is in contact with the photosensitive drum 1, the contact force is strong, and there is no rolling up at the time of collision with the recording medium 4. Further, the photosensitive drum 1 is not damaged.

剥離爪固定フレーム８が感光ドラム１に近い場合は、剥離爪７の湾曲が大きくなり、先端が感光ドラム１から離れてしまうので、好ましくない。感光ドラム１の外周下端と剥離爪７の配置の垂直方向の差１３が大きい場合は、剥離爪７の湾曲が大きくなり、先端が感光ドラム１から離れてしまうので、好ましくない。記録媒体４が感光ドラム１との間に入らないように、剥離爪７の先端部が感光ドラム１に当接するのが好ましい。また、剥離爪７を感光ドラム１の当接させる位置は、感光ドラム１の中心から鉛直方向に対して１５度以上３０度以下の角度の範囲で接しさせることが好ましい。記録媒体４が通過可能な高さを保持さる必要である。また、感光ドラム１に剥離爪７の先端から所定の長さ、例えば０．５ｍｍ以上、は接しさせる必要があるからである。   When the peeling claw fixing frame 8 is close to the photosensitive drum 1, the bending of the peeling claw 7 becomes large and the tip is separated from the photosensitive drum 1, which is not preferable. When the vertical difference 13 between the lower end of the outer periphery of the photosensitive drum 1 and the separation claw 7 is large, the peeling claw 7 is curved and the tip is separated from the photosensitive drum 1, which is not preferable. It is preferable that the tip of the peeling claw 7 abuts on the photosensitive drum 1 so that the recording medium 4 does not enter the photosensitive drum 1. Further, the position at which the peeling claw 7 is brought into contact with the photosensitive drum 1 is preferably in contact with the vertical direction from the center of the photosensitive drum 1 within an angle range of 15 degrees to 30 degrees. It is necessary to maintain a height at which the recording medium 4 can pass. Further, it is necessary to contact the photosensitive drum 1 with a predetermined length from the tip of the peeling claw 7, for example, 0.5 mm or more.

凹部１８は剥離爪固定フレーム８の先端の剛性を高める為に備えられている。仮にジャムが発生した場合に、変形し難くするためである。剥離爪固定板１９の先端は剥離爪７の位置決めさせるために変形することは好ましくない。また、凹部１８の先端は幅が狭く、樹脂製の剥離爪７が凹部１８の先端に直接当たると剥離爪７が折れる場合があるので、直接当てないため、剥離爪固定板１９を備える。剥離爪固定板１９は剥離爪７より剛性の高いＡＬ、ＳＵＳ等の金属板の平板でできている。   The recess 18 is provided to increase the rigidity of the tip of the peeling claw fixing frame 8. This is to make it difficult to deform if a jam occurs. It is not preferable that the tip of the peeling claw fixing plate 19 is deformed in order to position the peeling claw 7. Moreover, since the peeling nail | claw 7 may be broken when the resin-made peeling nail | claw 7 hits directly on the front-end | tip of the recessed part 18, since the front-end | tip of the recessed part 18 is narrow, the peeling nail fixing plate 19 is provided. The peeling claw fixing plate 19 is made of a flat plate made of a metal plate such as AL or SUS having higher rigidity than the peeling claw 7.

図２は、剥離爪の配置図である。剥離爪７は、感光ドラム１の長さ方向に６個配置している。中心から端方向に等間隔に配置している。剥離爪７に対応した位置に拍車１７が配置されている。使用する記憶媒体４の幅が変わっても、少なくとも２箇所以上の複数の箇所で剥離できるように配置されている。このため、各剥離爪７と感光ドラム１との接触の仕方が等しいことが望まれる。剥離爪固定フレーム８に剥離爪７を同じように取り付けることができ、剥離爪７は同じ形状のものを大量に生産できるので、容易に各剥離爪７と感光ドラム１との接触の仕方を同じくできる。また、剥離爪固定フレーム８に全ての剥離爪７が固定されているので、剥離爪固定プレート８を移動することで全ての剥離爪７を同時に移動させることができる。剥離爪７と感光ドラム１との離接位置の調節を容易にできる。   FIG. 2 is a layout diagram of the peeling claws. Six peeling claws 7 are arranged in the length direction of the photosensitive drum 1. They are arranged at equal intervals from the center toward the end. A spur 17 is disposed at a position corresponding to the peeling claw 7. Even if the width of the storage medium 4 to be used changes, it is arranged so that it can be peeled off at a plurality of at least two or more locations. For this reason, it is desired that the contact between each peeling claw 7 and the photosensitive drum 1 is equal. The peeling claw 7 can be attached to the peeling claw fixing frame 8 in the same manner, and the peeling claw 7 can be produced in large quantities with the same shape. Therefore, the manner of contact between each peeling claw 7 and the photosensitive drum 1 is easily the same. it can. Further, since all the peeling claws 7 are fixed to the peeling claw fixing frame 8, all the peeling claws 7 can be moved simultaneously by moving the peeling claw fixing plate 8. The separation / contact position between the peeling claw 7 and the photosensitive drum 1 can be easily adjusted.

図３は、剥離爪の構成を説明する図である。剥離爪７は樹脂製の扁平な薄板である。例えば、ＰＥＴ、ＰＯＭ樹脂などのエンジニアリングプラスチックが耐久性等に優れ、特に好ましい。ＰＰ等の樹脂でもよい。トレッシングペーパーのような薄い記録媒体を使用する場合は、厚みは０．２５ｍｍ程度で、少なくとも厚みが０．１５ｍｍ〜０．３５ｍｍのものを使用するのが好ましく、厚すぎても薄すぎても良くない。使用したい記録媒体４の厚み、感光ドラム１との位置関係などに応じて好適な厚みの板を使うのが好ましい。   FIG. 3 is a diagram illustrating the configuration of the peeling claw. The peeling claw 7 is a flat thin plate made of resin. For example, engineering plastics such as PET and POM resin are particularly preferable because of excellent durability and the like. A resin such as PP may be used. When a thin recording medium such as tressing paper is used, it is preferable to use a recording medium having a thickness of about 0.25 mm and at least a thickness of 0.15 mm to 0.35 mm. . It is preferable to use a plate having a suitable thickness in accordance with the thickness of the recording medium 4 to be used and the positional relationship with the photosensitive drum 1.

剥離爪７は先端部を残して剥離爪固定板１９に固定されている。固定の方法は、接着、溶着または両面粘着テープなどにより固定される。剥離爪固定板１９と剥離爪７の重なる部分で固定される。また、剥離爪固定板は剥離爪固定フレーム８に、接着、溶着または両面粘着テープなどにより固定されている。剥離爪７は樹脂で構成され、剥離爪固定板１９は金属で構成されているので、剥離爪７より剥離爪固定板１９の方が、強度が高い。   The peeling claw 7 is fixed to the peeling claw fixing plate 19 leaving the tip. The fixing method is fixed by adhesion, welding or double-sided adhesive tape. The peeling claw fixing plate 19 and the peeling claw 7 are fixed at the overlapping portion. The peeling claw fixing plate is fixed to the peeling claw fixing frame 8 by adhesion, welding, double-sided adhesive tape, or the like. Since the peeling claw 7 is made of resin and the peeling claw fixing plate 19 is made of metal, the peeling claw fixing plate 19 has higher strength than the peeling claw 7.

剥離爪７の先端部は頂点に向かって漸次細くなっている。厚み方向には漸次細くせず、一定の厚みのままである。厚み方向には変形しないように構成するのが好ましい。剥離爪７の先端の頂点から根元の方向に剥離爪固定板１９と重ならない部分がある。剥離爪固定板１９の外形は、剥離爪７の外形より一回り大きくし、剥離爪７の先端に向かって漸次細くなる辺に沿って細くなる傾斜部を備える。剥離爪７の柔軟性を保つ為に先端部は重ならないようにしている。剥離爪７の先端部は根元から８．０ｍｍ突出している。剥離爪７の先端部の根元の幅は６．０ｍｍである。剥離爪７が剥離爪固定板１９に固定されている部分の幅は１６．０ｍｍである。剥離爪７の全長は１４．０ｍｍである。これらの寸法も使用する記録媒体４の厚み、感光ドラム１との位置関係などに応じて±５ｍｍ程度の差で選択するのが好ましい。先端部のみを重ならないようにすることで、柔軟性を確保しつつ剥離爪７と剥離爪固定板１９との固定強度を大きくし、はがれ難くしている。また、剥離爪７を先端に向かい漸次細くなる形状に合わせることで、剥離爪７の位置合わせ時に見やすくなり、位置合わせがしやすくできる。仮に先端だけ重ならない四角い板であった場合に、小さな剥離爪７の先端のみしか見えずに調整作業がしにくいものとなってしまう。   The tip of the peeling claw 7 is gradually narrowed toward the apex. It does not become thinner gradually in the thickness direction, but remains constant. It is preferable to configure so as not to deform in the thickness direction. There is a portion that does not overlap with the peeling claw fixing plate 19 in the direction from the top to the root of the peeling claw 7. The outer shape of the peeling claw fixing plate 19 is provided with an inclined portion that is slightly larger than the outer shape of the peeling claw 7 and narrows along a side that gradually becomes thinner toward the tip of the peeling claw 7. In order to maintain the flexibility of the peeling claw 7, the tip is not overlapped. The tip of the peeling claw 7 protrudes 8.0 mm from the base. The width of the base of the tip of the peeling claw 7 is 6.0 mm. The width of the portion where the peeling claw 7 is fixed to the peeling claw fixing plate 19 is 16.0 mm. The total length of the peeling claw 7 is 14.0 mm. These dimensions are preferably selected with a difference of about ± 5 mm in accordance with the thickness of the recording medium 4 to be used, the positional relationship with the photosensitive drum 1 and the like. By ensuring that only the tip portion does not overlap, the fixing strength between the peeling claw 7 and the peeling claw fixing plate 19 is increased while ensuring flexibility, making it difficult to peel off. Further, by adjusting the peeling claw 7 to a shape that gradually becomes narrower toward the tip, it becomes easier to see when the peeling claw 7 is positioned, and the positioning can be easily performed. If it is a square plate that does not overlap only the tip, only the tip of the small peeling claw 7 is visible, and the adjustment work becomes difficult.

当接部１５は剥離爪固定板１９にプレス加工によって凸部を形成したものである。剥離爪７は剥離爪固定板１９に固定されているが、記録媒体４との衝突によって移動する可能性があり、これを防止する為に設けた。移動することで、固定部が故障して剥がれてしまう問題を解決している。図では１カ所だけであるが、２箇所以上で当接することが好ましい。より移動を防止できる。また、剥離爪７に凹部を設けてそこに嵌るように当接部１５を設けることより好ましい。１方向のみならず広い角度範囲で当接し、移動を防止できるからである。また、使用時には剥離爪７が剥離爪固定板１９の下側になるように配置されるが、これは記録媒体４の進行によって剥離爪７が剥離爪固定板１９から剥がれ難くし、また、当接部１５によって効果的に移動を防止するためである。   The contact portion 15 is formed by forming a convex portion on the peeling claw fixing plate 19 by pressing. The peeling claw 7 is fixed to the peeling claw fixing plate 19, but it may move due to a collision with the recording medium 4, and is provided to prevent this. By moving, the problem that the fixing part breaks and peels is solved. Although it is only one place in the figure, it is preferable to contact at two places or more. Further movement can be prevented. Moreover, it is more preferable to provide the contact part 15 so that a recessed part may be provided in the peeling claw 7 and it may fit there. This is because the contact can be made not only in one direction but also in a wide angle range, and movement can be prevented. In use, the peeling claw 7 is disposed below the peeling claw fixing plate 19, which makes it difficult for the peeling claw 7 to peel off from the peeling claw fixing plate 19 due to the progress of the recording medium 4. This is because the contact 15 effectively prevents movement.

図４は、感光ドラムから記録媒体が剥離される様子を説明する図である。図４（ａ）は記録媒体と剥離爪が衝突する前の状態を示す図である。図４（ｂ）は記録媒体と剥離爪が衝突した状態を示す図である。図４（ｃ）は剥離爪が記録媒体を剥離する状態を示す図である。   FIG. 4 is a diagram for explaining how the recording medium is peeled from the photosensitive drum. FIG. 4A is a diagram illustrating a state before the recording medium and the peeling claw collide. FIG. 4B is a diagram illustrating a state in which the recording medium and the peeling claw collide with each other. FIG. 4C is a diagram showing a state where the peeling claw peels off the recording medium.

記録媒体４が感光ドラム１に付着したまま感光ドラム１が回転すると、記録媒体４の先端が剥離爪７の先端に衝突する。剥離爪７の先端部を除き、剥離爪７より強度の高い剥離爪固定板１９に固定されているので、先端部の柔軟性を維持したまま、感光ドラム１に先端部を含む面を当接させることができ、その当接力が強くなっている。剥離爪７の先端は、感光ドラム１方向に力が加わっているので、衝突時に接したまま多少変形することになる。この変形により、衝突時のエネルギーが多少吸収される。衝突時のエネルギーが小さくなるため剥離爪７が大きく浮き上がることを防止できる。記録媒体４と剥離爪７の衝突後、記録媒体４は撓み２４ができ、記録媒体４の先端が浮き上がる。剥離爪７は感光ドラム１方向に力が加わっているので、感光ドラム１に接したままとなる。その後、感光ドラム１と記録媒体４の間に剥離爪７が入った状態となる。その後、剥離爪７によって記録媒体４が感光ドラム１から剥離される。   When the photosensitive drum 1 rotates with the recording medium 4 attached to the photosensitive drum 1, the tip of the recording medium 4 collides with the tip of the peeling claw 7. Since it is fixed to the peeling claw fixing plate 19 having a strength higher than that of the peeling claw 7 except for the tip of the peeling claw 7, the surface including the tip is brought into contact with the photosensitive drum 1 while maintaining the flexibility of the tip. The abutting force is strong. Since a force is applied to the tip of the peeling claw 7 in the direction of the photosensitive drum 1, the tip of the peeling claw 7 is slightly deformed while being in contact with the collision. Due to this deformation, the energy at the time of collision is somewhat absorbed. Since the energy at the time of collision becomes small, it is possible to prevent the peeling claw 7 from being lifted greatly. After the collision between the recording medium 4 and the peeling claw 7, the recording medium 4 is bent 24 and the tip of the recording medium 4 is lifted. The peeling claw 7 is in contact with the photosensitive drum 1 because a force is applied in the direction of the photosensitive drum 1. Thereafter, the peeling claw 7 enters between the photosensitive drum 1 and the recording medium 4. Thereafter, the recording medium 4 is peeled from the photosensitive drum 1 by the peeling claw 7.

剥離爪７は感光ドラム１と当接しているが、記録媒体１が通過する方向とは逆側に凸状に撓んでいる。そのため、剥離した記録媒体４が剥離爪７に当たり、転写されたトナーが削ぎ落とされることの防止にもなる。   The peeling claw 7 is in contact with the photosensitive drum 1 but is bent in a convex shape on the opposite side to the direction in which the recording medium 1 passes. Therefore, it is possible to prevent the peeled recording medium 4 from hitting the peeling claw 7 and scraping off the transferred toner.

本発明は電子写真式の画像形成装置に利用できる。   The present invention can be used for an electrophotographic image forming apparatus.

１ 感光ドラム
２ ＬＥＤヘッド
３ 現像器
４ 記録媒体
５ 帯電器
６ クリーニングユニット
７ 剥離爪
８ 剥離爪固定フレーム
９ 転写器
１０ 搬送ローラ
１１ 定着器
１９ 剥離爪固定板 DESCRIPTION OF SYMBOLS 1 Photosensitive drum 2 LED head 3 Developing device 4 Recording medium 5 Charging device 6 Cleaning unit 7 Peeling claw 8 Peeling claw fixing frame 9 Transfer device 10 Conveying roller 11 Fixing device 19 Peeling claw fixing plate

Claims (5)

表面に形成した静電潜像に応じてトナーを付着させる感光ドラムと、前記感光ドラムに付着した前記トナーを記録媒体に転写する転写器と、前記記録媒体に転写した前記トナーを前記記録媒体に定着させる定着器と、前記感光ドラムに付着した記録媒体を剥離する剥離爪と、前記剥離爪を固定する剥離爪固定フレームと、を有する画像形成装置において、
前記剥離爪と前記剥離爪固定フレームとの間に固定される金属平板製の剥離爪固定板を有し、
前記剥離爪は前記感光ドラムに接する面が先端方向に向かって漸次細く形成され、かつ厚みが一定に形成された樹脂製の薄板であり、
前記剥離爪は前記漸次細く形成された部分であって先端を含む前記先端方向の一部分を除き前記剥離爪固定板に固定され、
前記剥離爪固定板は前記剥離爪が固定されている部分の前記漸次細く形成された辺に沿って、前記先端方向に向かって漸次細く形成された傾斜部と前記剥離爪の厚み方向に交差する方向の移動を規制する凸部を備え、
前記剥離爪の前記剥離爪固定板に固定されていない部分が前記感光ドラム方向に突出するように湾曲し、前記面が前記感光ドラムに接することを特徴とする画像形成装置。 A photosensitive drum that attaches toner according to the electrostatic latent image formed on the surface, a transfer device that transfers the toner attached to the photosensitive drum to a recording medium, and the toner transferred to the recording medium to the recording medium In an image forming apparatus having a fixing device for fixing, a peeling claw for peeling the recording medium attached to the photosensitive drum, and a peeling claw fixing frame for fixing the peeling claw.
It has a peeling claw fixing plate made of a metal plate fixed between the peeling claw and the peeling claw fixing frame,
The peeling claw is a resin thin plate in which the surface in contact with the photosensitive drum is formed to be gradually thinner toward the tip direction, and the thickness is constant.
The peeling claw is a portion that is formed gradually thinner and is fixed to the peeling claw fixing plate except for a part in the tip direction including the tip,
The peeling claw fixing plate intersects with the thickness direction of the peeling claw and the inclined portion which is gradually narrowed toward the distal end direction along the side where the peeling claw is fixed to the gradually narrowed side. Protrusions that restrict movement in the direction,
An image forming apparatus, wherein a portion of the peeling claw that is not fixed to the peeling claw fixing plate is curved so as to protrude toward the photosensitive drum, and the surface is in contact with the photosensitive drum. 前記剥離爪固定フレームの先端部が凹状に形成されていることを特徴とする請求項１に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein a tip end portion of the peeling claw fixing frame is formed in a concave shape. 前記感光ドラムの外周の所定の位置の接線方向に平行に前記剥離爪が前記剥離爪固定板に固定されていることを特徴とする請求項１または請求項２に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein the peeling claw is fixed to the peeling claw fixing plate in parallel with a tangential direction of a predetermined position on an outer periphery of the photosensitive drum. 前記所定の位置は前記感光ドラムの鉛直方向の最下点であることを特徴とする請求項３に記載の画像形成装置。   The image forming apparatus according to claim 3, wherein the predetermined position is a lowest point in a vertical direction of the photosensitive drum. 前記剥離爪固定フレームは複数の前記剥離爪が備えられ、前記剥離爪固定フレームを移動することで、前記複数の前記剥離爪が同時に移動し、前記接線方向に平行に位置決めされることを特徴とする請求項３または請求項４に記載の画像形成装置。   The peeling claw fixing frame includes a plurality of peeling claws, and the plurality of peeling claws move simultaneously by moving the peeling claw fixing frame, and are positioned parallel to the tangential direction. The image forming apparatus according to claim 3 or 4, wherein:
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