JP2015148738A - Developer storage unit, developing apparatus, process cartridge, and image forming apparatus - Google Patents

Developer storage unit, developing apparatus, process cartridge, and image forming apparatus Download PDF

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JP2015148738A
JP2015148738A JP2014021968A JP2014021968A JP2015148738A JP 2015148738 A JP2015148738 A JP 2015148738A JP 2014021968 A JP2014021968 A JP 2014021968A JP 2014021968 A JP2014021968 A JP 2014021968A JP 2015148738 A JP2015148738 A JP 2015148738A
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stirring
developer
supported
stirring shaft
storage unit
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JP6332989B2 (en
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良亮 中澤
Yoshiaki Nakazawa
良亮 中澤
広幸 宗次
Hiroyuki Munetsugi
広幸 宗次
崇 加瀬
Takashi Kase
崇 加瀬
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Canon Inc
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Canon Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a developer storage unit configured to properly agitate and circulate developer, to reduce image density unevenness.SOLUTION: A developer storage unit includes an agitation member 21 having an agitation shaft section 20 for agitating developer and a flexible agitation sheet section 19. The agitation shaft section 20 includes a plurality of support sections 20c supporting the agitation sheet section 19. The agitation sheet section 19 includes: a plurality of sections 19a to be supported by the support section 20c; a first agitation section 19b protruding upstream in a rotation direction of the agitation shaft section 20 with respect to the section 19a to be supported; and a second agitation section 19c protruding opposite the first agitation section 19b with respect to the section 19a to be supported. The second agitation section 19c includes a notch 19d arranged between the sections 19a to be supported.

Description

本発明は、現像剤収納ユニット、現像装置、プロセスカートリッジ及び画像形成装置に関するものである。   The present invention relates to a developer storage unit, a developing device, a process cartridge, and an image forming apparatus.

ここで、電子写真画像形成装置(以下、「画像形成装置」という)とは、例えば、電子写真画像形成プロセスを用いて記録材に画像を形成するものである。例えば、電子写真複写機、例えば、LED(Light Emitting Diode;発光ダイオード)プリンタ、レーザービームプリンタ等の電子写真プリンタ、電子写真ファクシミリ装置等が含まれる。   Here, the electrophotographic image forming apparatus (hereinafter, referred to as “image forming apparatus”) forms an image on a recording material using, for example, an electrophotographic image forming process. For example, an electrophotographic copying machine, for example, an LED (Light Emitting Diode) printer, an electrophotographic printer such as a laser beam printer, an electrophotographic facsimile machine, or the like is included.

また、現像装置とは少なくとも現像手段を一体的にカートリッジ化し、このカートリッジを画像形成装置に対して着脱可能とするもの、または画像形成装置に設置されたものである。また、電子写真感光ドラム、及び電子写真感光ドラムに作用する現像手段を一体的にカートリッジ化し、このカートリッジを画像形成装置に対して着脱可能としたプロセスカートリッジの一部、または画像形成装置に設置されたプロセスカートリッジの一部である。   The developing device is a device in which at least the developing means is integrated into a cartridge, and the cartridge can be attached to and detached from the image forming apparatus, or is installed in the image forming apparatus. In addition, the electrophotographic photosensitive drum and the developing means acting on the electrophotographic photosensitive drum are integrally formed as a cartridge, and the cartridge is installed in a part of the process cartridge that is detachable from the image forming apparatus or in the image forming apparatus. Part of the process cartridge.

また、現像剤収納ユニットとは少なくとも記録材に画像を形成するための現像剤を収納するものである。   The developer storage unit stores at least a developer for forming an image on a recording material.

従来の電子写真形成プロセスを用いた画像形成装置には、電子写真感光体及びそれに作用する画像形成プロセス手段を一体的にカートリッジ化して、このカートリッジを画像形成装置に着脱可能とするプロセスカートリッジ方式が採用されている。   A conventional image forming apparatus using an electrophotographic forming process has a process cartridge system in which an electrophotographic photosensitive member and an image forming process means acting on the electrophotographic photosensitive member are integrally formed into a cartridge, and the cartridge can be attached to and detached from the image forming apparatus. It has been adopted.

このようなプロセスカートリッジ、またはプロセスカートリッジの一部である現像装置では、現像枠体内部に収納された現像剤(トナー、キャリア等)を撹拌する撹拌手段が設けられている。   Such a process cartridge or a developing device that is a part of the process cartridge is provided with a stirring means for stirring the developer (toner, carrier, etc.) stored in the developing frame.

撹拌手段は、現像枠体内部で現像剤を循環させ、現像手段に現像剤を供給するものである。このような撹拌手段としては、特許文献1に記載されたように、可撓性を有する撹拌シート部(特許文献1ではシート片)が撹拌軸部(特許文献1では回転体)に取り付けられているものが知られている(特許文献1の図2参照)。   The agitating means circulates the developer inside the developing frame and supplies the developer to the developing means. As such a stirring means, as described in Patent Document 1, a flexible stirring sheet part (a sheet piece in Patent Document 1) is attached to a stirring shaft part (a rotating body in Patent Document 1). Is known (see FIG. 2 of Patent Document 1).

更に、特許文献2に記載されたように、可撓性を有する撹拌シート部(特許文献2ではパドル部材)が撹拌軸部(特許文献2ではパドル回転軸)に複数取り付けられているものが知られている(特許文献2の図4参照)。   Further, as described in Patent Document 2, a plurality of flexible stirring sheet portions (paddle members in Patent Document 2) are attached to a stirring shaft portion (paddle rotation shaft in Patent Document 2). (See FIG. 4 of Patent Document 2).

特開2001−318517号公報JP 2001-318517 A 特開2013−218109号公報JP 2013-218109 A

しかしながら、前述したような構成の撹拌手段を用いた現像装置では撹拌手段をコストダウンするために可撓性を有する撹拌シート部の厚みを薄くする場合がある。その場合、撹拌シート部が薄いと現像剤に対して十分な撹拌力を発揮することができない可能性がある。   However, in the developing device using the stirring unit configured as described above, the thickness of the flexible stirring sheet portion may be reduced in order to reduce the cost of the stirring unit. In that case, if the stirring sheet portion is thin, there is a possibility that sufficient stirring force cannot be exerted on the developer.

その結果として、現像手段への現像剤供給が十分でなく画像濃度にムラが発生する可能性がある。   As a result, there is a possibility that the developer is not sufficiently supplied to the developing means and unevenness in the image density occurs.

本発明は前記課題を解決するものであり、その目的とするところは、良好な現像剤の撹拌循環を実現し、画像濃度ムラを低減する現像剤収納ユニットを提供するものである。   The present invention solves the above-mentioned problems, and an object of the present invention is to provide a developer storage unit that realizes good developer circulation and reduces image density unevenness.

前記目的を達成するための本発明に係る現像剤収納ユニットの代表的な構成は、現像剤を収納する現像剤容器と、現像剤を撹拌するための撹拌軸部と、可撓性を有する撹拌シート部とを有する撹拌手段と、を有し、前記撹拌軸部は、前記撹拌シート部を支持する複数の支持部を有し、前記撹拌シート部は、前記支持部に支持される複数の被支持部と、前記被支持部に対して前記撹拌軸部の回転方向の上流側に突き出る第一撹拌部と、前記被支持部に対して前記第一撹拌部と反対側に突き出る第二撹拌部と、を有し、前記第二撹拌部は、前記複数の被支持部間に設けられる切り欠き部を有することを特徴とする。   In order to achieve the above object, a typical configuration of a developer storage unit according to the present invention includes a developer container for storing a developer, a stirring shaft for stirring the developer, and a flexible stirring. A stirring means having a sheet portion, the stirring shaft portion having a plurality of support portions for supporting the stirring sheet portion, and the stirring sheet portion having a plurality of supports supported by the support portion. A first stirring unit protruding to the upstream side in the rotation direction of the stirring shaft portion with respect to the supported portion, and a second stirring portion protruding to the opposite side of the first stirring portion with respect to the supported portion. And the second agitating part has a notch provided between the plurality of supported parts.

上記構成によれば、良好な現像剤の循環を実現した現像剤収納ユニットを提供することができる。   According to the above configuration, it is possible to provide a developer storage unit that realizes good developer circulation.

本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジを着脱可能に設けられる画像形成装置の構成を示す断面説明図である。FIG. 3 is an explanatory cross-sectional view illustrating a configuration of an image forming apparatus in which a process cartridge including a developing device having a developer storage unit according to the present invention is detachably provided. 本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジの第1実施形態の構成を示す断面説明図である。FIG. 3 is an explanatory cross-sectional view illustrating a configuration of a first embodiment of a process cartridge including a developing device having a developer storage unit according to the present invention. 本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジの構成を示す斜視説明図である。FIG. 3 is a perspective explanatory view showing a configuration of a process cartridge including a developing device having a developer storage unit according to the present invention. (a)は第1実施形態における複数の支持部を有する撹拌軸部の構成を示す斜視説明図である。(b)は第1実施形態のフック部の構成を示す斜視説明図である。(c)は第1実施形態のフック部の構成を示す断面説明図である。(A) is a perspective explanatory drawing which shows the structure of the stirring shaft part which has the some support part in 1st Embodiment. (B) is a perspective explanatory drawing which shows the structure of the hook part of 1st Embodiment. (C) is sectional explanatory drawing which shows the structure of the hook part of 1st Embodiment. (a)は第1実施形態における複数の支持部を有した撹拌手段の構成を示す分解斜視図、(b)は第1実施形態における複数の支持部を有した撹拌手段の構成を示す斜視説明図である。(A) is an exploded perspective view showing the configuration of the stirring means having a plurality of support portions in the first embodiment, and (b) is a perspective view showing the configuration of the stirring means having a plurality of support portions in the first embodiment. FIG. (a)〜(c)は第1実施形態における撹拌手段の回転中の挙動を説明する断面説明図である。(A)-(c) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in 1st Embodiment. (a)は比較例1における撹拌手段の回転中の挙動を説明する断面説明図である。(b)は比較例2における撹拌手段の回転中の挙動を説明する断面説明図である。(A) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in the comparative example 1. FIG. (B) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in the comparative example 2. FIG. (a)は第二撹拌部に切り欠き部を設けない場合の比較例3の構成を示す平面説明図である。(b)は図8(a)のE1方向から見た側面説明図である。(c)は比較例3の構成を示す断面説明図である。(A) is plane explanatory drawing which shows the structure of the comparative example 3 when not providing a notch part in a 2nd stirring part. (B) is side explanatory drawing seen from E1 direction of Fig.8 (a). (C) is sectional explanatory drawing which shows the structure of the comparative example 3. FIG. (a)は第二撹拌部に切り欠き部を設けた第1実施形態の構成を示す平面説明図である。(b)は図9(a)のE1方向から見た側面説明図である。(c)は第1実施形態の構成を示す断面説明図である。(A) is plane explanatory drawing which shows the structure of 1st Embodiment which provided the notch part in the 2nd stirring part. (B) is side explanatory drawing seen from E1 direction of Fig.9 (a). (C) is sectional explanatory drawing which shows the structure of 1st Embodiment. (a)は第2実施形態の撹拌シート部の構成を示す図、(b)は第3実施形態の撹拌シート部の構成を示す図である。(A) is a figure which shows the structure of the stirring sheet part of 2nd Embodiment, (b) is a figure which shows the structure of the stirring sheet part of 3rd Embodiment. (a)は第4実施形態における複数の支持部を有した撹拌手段の構成を示す分解斜視図、(b)は第4実施形態における複数の支持部を有した撹拌手段の構成を示す斜視説明図である。(A) is an exploded perspective view showing the configuration of the stirring means having a plurality of support portions in the fourth embodiment, and (b) is a perspective view showing the configuration of the stirring means having a plurality of support portions in the fourth embodiment. FIG. 本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジの第5実施形態の構成を示す断面説明図である。FIG. 10 is an explanatory cross-sectional view showing a configuration of a fifth embodiment of a process cartridge including a developing device having a developer storage unit according to the present invention. (a)は第5実施形態における撹拌手段の構成を示す分解断面図、(b)は第5実施形態における撹拌手段の構成を示す断面説明図である。(A) is decomposition | disassembly sectional drawing which shows the structure of the stirring means in 5th Embodiment, (b) is sectional explanatory drawing which shows the structure of the stirring means in 5th Embodiment. (a)〜(c)は第5実施形態における撹拌手段の回転中の挙動を説明する断面説明図である。(A)-(c) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in 5th Embodiment. (a)は比較例4における撹拌手段の回転中の挙動を説明する断面説明図である。(b)は比較例5における撹拌手段の回転中の挙動を説明する断面説明図である。(A) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in the comparative example 4. FIG. (B) is sectional explanatory drawing explaining the behavior in rotation of the stirring means in the comparative example 5. FIG. (a)は第5実施形態における撹拌手段の構成を示す断面説明図、(b)は比較例6における撹拌手段の構成を示す断面説明図である。(A) is sectional explanatory drawing which shows the structure of the stirring means in 5th Embodiment, (b) is sectional explanatory drawing which shows the structure of the stirring means in the comparative example 6. 本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジの第6実施形態の構成を示す断面説明図である。FIG. 10 is an explanatory cross-sectional view illustrating a configuration of a sixth embodiment of a process cartridge including a developing device having a developer storage unit according to the present invention.

図により本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジを着脱可能に設けられる画像形成装置の一実施形態を具体的に説明する。   An embodiment of an image forming apparatus in which a process cartridge provided with a developing device having a developer storage unit according to the present invention is detachably provided will be described in detail with reference to the drawings.

尚、以下の実施形態に記載されている構成部品の機能、材質、形状、機能、その相対配置等は、特に特定的な記載がない限りは、この発明の範囲をそれらのみに限定する趣旨のものではない。また、以下の説明で一度説明した部材についての材質、形状等は、特に改めて記載しない限り初めの説明と同様のものである。   It should be noted that the functions, materials, shapes, functions, relative arrangements, etc. of the components described in the following embodiments are intended to limit the scope of the present invention only to those unless otherwise specified. It is not a thing. Further, the materials, shapes, etc. of the members once described in the following description are the same as those in the first description unless otherwise described.

先ず、図1〜図9を用いて本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジを着脱可能に設けられる画像形成装置の第1実施形態の構成について説明する。   First, the configuration of a first embodiment of an image forming apparatus in which a process cartridge including a developing device having a developer storage unit according to the present invention is detachably provided will be described with reference to FIGS.

<プロセスカートリッジ>
以下、図1〜図3を用いて本発明に係る現像剤収納ユニットを有する現像装置38を備えたプロセスカートリッジ4について説明する。図1は本発明に係る現像剤収納ユニットを有する現像装置38を備えたプロセスカートリッジ4を着脱可能に設けられる画像形成装置2の構成を示す断面説明図である。図2は本発明に係るプロセスカートリッジ4の構成を示す断面説明図である。図3は本発明に係るプロセスカートリッジ4の構成を示す斜視説明図である。
<Process cartridge>
The process cartridge 4 including the developing device 38 having the developer storage unit according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional explanatory view showing a configuration of an image forming apparatus 2 in which a process cartridge 4 having a developing device 38 having a developer storage unit according to the present invention is detachably provided. FIG. 2 is an explanatory sectional view showing the structure of the process cartridge 4 according to the present invention. FIG. 3 is a perspective explanatory view showing the configuration of the process cartridge 4 according to the present invention.

現像装置38は、静電潜像を担持する像担持体となる感光ドラム11の表面に形成された静電潜像を現像剤Tを用いて現像するための現像剤担持体となる現像ローラ13を有する。   The developing device 38 is a developing roller 13 serving as a developer bearing member for developing the electrostatic latent image formed on the surface of the photosensitive drum 11 serving as an image bearing member bearing an electrostatic latent image using the developer T. Have

現像装置38は、現像剤Tを収納する現像剤容器となる現像枠体40内に収納された現像剤Tを撹拌する回転可能な撹拌手段となる撹拌部材21を有する。撹拌部材21により現像枠体40内に収納された現像剤Tを撹拌する。そして、現像剤供給ローラ23により現像ローラ13の表面に現像剤Tを供給する。プロセスカートリッジ4は、現像装置38と、感光ドラム11とを有する。   The developing device 38 includes an agitating member 21 serving as a rotatable agitating means for agitating the developer T accommodated in the developing frame 40 serving as a developer container for accommodating the developer T. The developer T accommodated in the developing device frame 40 is stirred by the stirring member 21. Then, the developer T is supplied to the surface of the developing roller 13 by the developer supplying roller 23. The process cartridge 4 includes a developing device 38 and a photosensitive drum 11.

尚、以下の説明において、「長手方向」とは、図3の矢印F方向で示すプロセスカートリッジ4の長手方向と一致するものとする。また、図4(a)に示すように、図示しないモータ等の駆動手段から回転駆動力が伝達される撹拌部材21の棒状の撹拌軸部20の長手方向と一致するものとする。   In the following description, the “longitudinal direction” corresponds to the longitudinal direction of the process cartridge 4 indicated by the arrow F direction in FIG. Further, as shown in FIG. 4A, it is assumed that it coincides with the longitudinal direction of the rod-like stirring shaft portion 20 of the stirring member 21 to which the rotational driving force is transmitted from a driving means such as a motor (not shown).

図2に示すように、プロセスカートリッジ4は、像担持体としての感光ドラム11と、該感光ドラム11の表面に作用する画像形成プロセス手段を備える。ここで、画像形成プロセス手段としては、例えば、感光ドラム11の表面を一様に帯電させる帯電手段となる帯電ローラ12を有する。   As shown in FIG. 2, the process cartridge 4 includes a photosensitive drum 11 as an image carrier and an image forming process unit that acts on the surface of the photosensitive drum 11. Here, the image forming process means includes, for example, a charging roller 12 serving as a charging means for uniformly charging the surface of the photosensitive drum 11.

更に、図1に示すように、プロセスカートリッジ4の外部に設けられ、一様に帯電した感光ドラム11の表面に画像情報に応じてレーザ光8aを照射して静電潜像を形成する像露光手段となるレーザスキャナ8を有する。   Further, as shown in FIG. 1, an image exposure is provided outside the process cartridge 4 to irradiate the uniformly charged surface of the photosensitive drum 11 with a laser beam 8a according to image information to form an electrostatic latent image. It has a laser scanner 8 as a means.

更に、感光ドラム11の表面に形成された静電潜像に現像剤Tを供給してトナー像として現像する現像手段となる現像装置38を有する。更に、感光ドラム11の表面に残留した現像剤T(トナー、キャリア等を含む)を除去するためのクリーニング手段となるクリーナユニット24を有する。   Further, the image forming apparatus includes a developing device 38 serving as a developing unit that supplies the developer T to the electrostatic latent image formed on the surface of the photosensitive drum 11 and develops the toner image. Further, a cleaner unit 24 serving as a cleaning unit for removing the developer T (including toner, carrier, etc.) remaining on the surface of the photosensitive drum 11 is provided.

本実施形態のプロセスカートリッジ4は、図2及び図3に示すように、感光ドラム11の周囲に帯電手段である帯電ローラ12、クリーニング手段として弾性を有するクリーニングブレード14を有するクリーナユニット24を備えている。   As shown in FIGS. 2 and 3, the process cartridge 4 of the present embodiment includes a cleaner roller 24 having a charging roller 12 as charging means around the photosensitive drum 11 and an elastic cleaning blade 14 as cleaning means. Yes.

また、プロセスカートリッジ4は、現像枠体40を有する現像装置38を備えている。プロセスカートリッジ4は、クリーナユニット24と現像装置38とを一体化して図1に示す画像形成装置2本体に対して着脱可能に構成されている。   Further, the process cartridge 4 includes a developing device 38 having a developing frame 40. The process cartridge 4 is configured to be detachable from the main body of the image forming apparatus 2 shown in FIG. 1 by integrating the cleaner unit 24 and the developing device 38.

現像装置38は、現像手段を構成する現像剤担持体としての現像ローラ13、現像ローラ13の表面に担持される現像剤Tの層厚を規制する現像ブレード15を備える。更に、現像剤容器となる現像枠体40内に収納された現像剤Tを現像ローラ13に供給する現像剤の供給回転体となる現像剤供給ローラ23を備える。更に、現像剤Tを収納する現像枠体40、現像剤Tを撹拌して現像剤Tを供給ローラ23に供給する撹拌手段となる撹拌部材21を備える。   The developing device 38 includes a developing roller 13 as a developer carrying member constituting the developing unit, and a developing blade 15 that regulates the layer thickness of the developer T carried on the surface of the developing roller 13. Further, a developer supply roller 23 serving as a developer supply rotating body for supplying the developer T accommodated in the developing frame 40 serving as a developer container to the developing roller 13 is provided. Furthermore, a developing device frame 40 that stores the developer T, and a stirring member 21 that serves as stirring means for stirring the developer T and supplying the developer T to the supply roller 23 are provided.

撹拌部材21は、図5に示すように、棒状の撹拌軸部20と、可撓性を有する撹拌シート部19とを有して構成される。現像ローラ13及び撹拌部材21の撹拌軸部20は現像枠体40に回転可能に軸支されている。また、現像ブレード15は現像枠体40に固定支持されている。   As shown in FIG. 5, the stirring member 21 includes a rod-shaped stirring shaft portion 20 and a flexible stirring sheet portion 19. The developing roller 13 and the stirring shaft portion 20 of the stirring member 21 are rotatably supported by the developing frame 40. The developing blade 15 is fixedly supported by the developing frame 40.

<画像形成装置>
図2及び図3に示すプロセスカートリッジ4は、図1に示す画像形成装置2に装着されて画像形成に用いられる。画像形成は画像形成装置2本体の下部に装着されたシートカセット6から搬送ローラ7によって記録材となるシートSを搬送する。シートSの搬送動作と同期して、感光ドラム11の表面にレーザスキャナ8から選択的な露光をして静電潜像を形成する。
<Image forming apparatus>
The process cartridge 4 shown in FIGS. 2 and 3 is mounted on the image forming apparatus 2 shown in FIG. 1 and used for image formation. In image formation, a sheet S serving as a recording material is conveyed by a conveyance roller 7 from a sheet cassette 6 mounted at the lower part of the main body of the image forming apparatus 2. In synchronization with the transport operation of the sheet S, the surface of the photosensitive drum 11 is selectively exposed from the laser scanner 8 to form an electrostatic latent image.

現像枠体40内に収納された現像剤Tは、スポンジ状の現像剤供給ローラ23によって現像ローラ13に供給される。そして、現像ブレード15により現像ローラ13の表面に現像剤Tが薄層担持される。現像ローラ13に図示しない現像バイアス電源から現像バイアス電圧を印加することにより感光ドラム11の表面に形成された静電潜像に応じて現像剤Tを供給してトナー像として現像する。   The developer T stored in the developing frame 40 is supplied to the developing roller 13 by a sponge-like developer supply roller 23. Then, a thin layer of developer T is carried on the surface of the developing roller 13 by the developing blade 15. By applying a developing bias voltage from a developing bias power source (not shown) to the developing roller 13, a developer T is supplied in accordance with the electrostatic latent image formed on the surface of the photosensitive drum 11, and developed as a toner image.

感光ドラム11の表面に形成されたトナー像を転写手段となる転写ローラ9へ図示しない転写バイアス電源から転写バイアス電圧を印加する。これによりレジストローラ16によって感光ドラム11の表面に形成されたトナー像と同期をとって感光ドラム11と転写ローラ9との転写ニップ部に搬送されるシートSに転写する。   A transfer bias voltage is applied from a transfer bias power source (not shown) to the transfer roller 9 serving as a transfer means for the toner image formed on the surface of the photosensitive drum 11. Thus, the toner image formed on the surface of the photosensitive drum 11 by the registration roller 16 is synchronized with the toner image formed on the surface of the photosensitive drum 11 and transferred to the sheet S conveyed to the transfer nip portion between the photosensitive drum 11 and the transfer roller 9.

感光ドラム11と転写ローラ9との転写ニップ部においてトナー像が転写されたシートSは、定着手段となる定着装置10へ搬送されて加熱及び加圧されてトナー像がシートSに定着される。その後、トナー像が定着されたシートSは排出ローラ1により搬送されて画像形成装置2本体上部に設けられた排出部3に排出される。   The sheet S on which the toner image is transferred at the transfer nip portion between the photosensitive drum 11 and the transfer roller 9 is conveyed to a fixing device 10 serving as a fixing unit, and is heated and pressed to fix the toner image on the sheet S. Thereafter, the sheet S on which the toner image is fixed is conveyed by the discharge roller 1 and discharged to a discharge unit 3 provided at the upper part of the main body of the image forming apparatus 2.

本実施形態においては、画像形成装置2本体に対して一つのプロセスカートリッジ4を装着する構成の一例を示した。他に、フルカラー画像に対応したイエロー色、マゼンタ色、シアン色、ブラック色の現像剤を収容した複数のプロセスカートリッジ4を画像形成装置2本体に対して装着できる構成でも良い。   In the present embodiment, an example of a configuration in which one process cartridge 4 is mounted on the main body of the image forming apparatus 2 is shown. In addition, a configuration in which a plurality of process cartridges 4 containing yellow, magenta, cyan, and black color developers corresponding to a full color image can be mounted on the image forming apparatus 2 main body may be employed.

<現像装置>
次に図2及び図3を用いて現像装置38の構成について説明する。本実施形態の現像装置38は、現像ローラ13、現像剤供給ローラ23、現像ブレード15、撹拌軸部20と撹拌シート部19とを有する撹拌部材21と、これらを支持する現像枠体40とを有して構成される。
<Developing device>
Next, the configuration of the developing device 38 will be described with reference to FIGS. The developing device 38 of the present embodiment includes a developing roller 13, a developer supply roller 23, a developing blade 15, a stirring member 21 having a stirring shaft portion 20 and a stirring sheet portion 19, and a developing device frame 40 that supports them. It is configured.

図2に示すように、撹拌部材21の撹拌軸部20の回転中心Pは、図2の矢印G方向で示す現像剤供給ローラ23の重力方向と反対側の図2の上方投影領域V(投影領域内)に配置されている。   As shown in FIG. 2, the rotation center P of the stirring shaft portion 20 of the stirring member 21 is the upper projection area V (projection in FIG. 2 opposite to the gravity direction of the developer supply roller 23 shown by the arrow G direction in FIG. In the area).

図2に示すように、本実施形態の現像装置38は主に現像枠体40内部の現像剤Tの自重により該現像剤Tを現像剤供給ローラ23に供給している。更に、撹拌部材21により現像枠体40内部の現像剤Tの撹拌循環を良好に保つことで現像剤Tの劣化を抑制している。   As shown in FIG. 2, the developing device 38 of the present embodiment supplies the developer T to the developer supply roller 23 mainly by the weight of the developer T inside the developing device frame 40. Further, the stirring of the developer T inside the developing frame 40 is kept good by the stirring member 21, thereby suppressing the deterioration of the developer T.

尚、本実施形態において撹拌部材21の回転中心Pは、現像剤供給ローラ23を図2の矢印G方向で示す重力方向に対して逆向きとなる図2の上方に投影した上方投影領域V内に配置されている。そのため、撹拌部材21により撹拌された現像剤Tを自重により効果的に現像剤供給ローラ23へ供給することができる。   In the present embodiment, the rotation center P of the agitating member 21 is in the upper projection region V in which the developer supply roller 23 is projected upward in FIG. 2 opposite to the direction of gravity indicated by the arrow G direction in FIG. Is arranged. Therefore, the developer T stirred by the stirring member 21 can be effectively supplied to the developer supply roller 23 by its own weight.

<撹拌手段>
次に図4及び図5を用いて撹拌部材21の構成について説明する。図4(a)は撹拌軸部20の構成を示す斜視説明図である。図4(b)は撹拌軸部20の撹拌シート部19を支持する複数の支持部20cのうちの一つを拡大した部分拡大斜視図である。図4(c)は図4(b)のA−A断面図である。図5(a)は撹拌部材21の構成を示す分解斜視図である。図5(b)は撹拌部材21の構成を示す斜視斜視説明図である。
<Agitating means>
Next, the configuration of the stirring member 21 will be described with reference to FIGS. 4 and 5. FIG. 4A is a perspective explanatory view showing the configuration of the stirring shaft portion 20. FIG. 4B is a partially enlarged perspective view in which one of a plurality of support portions 20 c that support the stirring sheet portion 19 of the stirring shaft portion 20 is enlarged. FIG.4 (c) is AA sectional drawing of FIG.4 (b). FIG. 5A is an exploded perspective view showing the configuration of the stirring member 21. FIG. 5B is a perspective view illustrating the configuration of the stirring member 21.

図4(a)に示すように、撹拌軸部20の長手方向両端部には、図2に示す現像枠体40に対して回転可能に支持される被支持部20a,20bが設けられている。更に、撹拌軸部20の長手方向に沿って所定ピッチで撹拌シート部19を支持する複数の支持部20cを備えている。   As shown in FIG. 4A, supported portions 20a and 20b that are rotatably supported with respect to the developing device frame 40 shown in FIG. . In addition, a plurality of support portions 20c that support the stirring sheet portion 19 at a predetermined pitch along the longitudinal direction of the stirring shaft portion 20 are provided.

本実施形態の支持部20cは、図5に示す撹拌シート部19に設けられた貫通穴として長穴からなる被支持部19aに挿通可能である。支持部20cは、図4(b)に示すように、撹拌軸部20の図4(b)の矢印D方向で示す回転方向の下流に向かって先端部20iが伸びるフック部で構成される。   The support portion 20c of the present embodiment can be inserted into a supported portion 19a made of a long hole as a through hole provided in the stirring sheet portion 19 shown in FIG. As shown in FIG. 4B, the support portion 20c is configured by a hook portion in which the tip end portion 20i extends toward the downstream side in the rotation direction indicated by the arrow D direction in FIG. 4B of the stirring shaft portion 20.

フック部からなる支持部20cは、撹拌軸部20側(撹拌軸部側)の根元部20fの図4(b)の矢印F方向における幅W1よりも図4(b)の矢印F方向における幅W2が広い引っ掛け部20gを有する。フック部からなる支持部20cの先端部20iは、図4(b)に示すように、撹拌軸部20の図4(b)の矢印D方向で示す回転方向の下流に向かって(先端に向かって)徐々に尖った先鋭部からなる。   The support portion 20c formed of the hook portion has a width in the arrow F direction in FIG. 4B rather than a width W1 in the arrow F direction in FIG. 4B of the root portion 20f on the stirring shaft portion 20 side (stirring shaft portion side). W2 has a wide hook portion 20g. As shown in FIG. 4B, the tip 20i of the support portion 20c formed of the hook is directed downstream (toward the tip) in the rotational direction indicated by the arrow D in FIG. E) It consists of sharply pointed parts.

支持部20cの引っ掛け部20gの図4(b)の矢印F方向における幅W2は、図5(a)に示す可撓性を有する撹拌シート部19の支持部20cに支持される複数の被支持部19aの図5(a)の矢印F方向における幅W4よりも大きい幅で形成されている。また、支持部20cの根元部20fの図4(b)の矢印F方向における幅W1は、図5(a)に示す可撓性を有する撹拌シート部19の被支持部19aの図5(a)の矢印F方向における幅W4よりも小さい幅で形成されている。   The width W2 of the hook portion 20g of the support portion 20c in the direction of arrow F in FIG. 4 (b) is a plurality of supported portions supported by the support portion 20c of the stirring sheet portion 19 having flexibility shown in FIG. 5 (a). The portion 19a is formed with a width larger than the width W4 in the direction of the arrow F in FIG. The width W1 of the root portion 20f of the support portion 20c in the direction of arrow F in FIG. 4B is the same as that of the supported portion 19a of the stirring sheet portion 19 having flexibility shown in FIG. ) With a width smaller than the width W4 in the arrow F direction.

撹拌シート部19の貫通長穴からなる被支持部19aに支持部20cの先端部20iを挿入する。更に、撹拌シート部19を装着方向(図4(b)の下方向)に引っ張る。すると撹拌シート部19が弾性変形して貫通長穴からなる被支持部19aが一時的に拡径して該被支持部19a内に支持部20cの先端部20iを挿通することが出来る。そして、被支持部19aが支持部20cの根元部20fに嵌装され、撹拌シート部19が復元して被支持部19aが支持部20cに支持されて係止される。   The tip end portion 20i of the support portion 20c is inserted into the supported portion 19a formed of a through-hole in the stirring sheet portion 19. Further, the stirring sheet portion 19 is pulled in the mounting direction (downward direction in FIG. 4B). Then, the agitating sheet portion 19 is elastically deformed, and the supported portion 19a formed of a through-hole is temporarily expanded in diameter, and the tip portion 20i of the supporting portion 20c can be inserted into the supported portion 19a. Then, the supported portion 19a is fitted into the root portion 20f of the support portion 20c, the stirring sheet portion 19 is restored, and the supported portion 19a is supported and locked by the support portion 20c.

図4(c)に示すように、撹拌軸部20は、断面略円筒形状の略円筒部20dと平面部20eとを有して構成されている。平面部20eは、図4(a),(b)に示すように、図4(a)の矢印F方向に沿って所定ピッチで設けられた複数の支持部20cの間に設けられている。更に、平面部20eは、撹拌部材21の長手方向となる図4(a)の矢印F方向の両端部に設けられている。   As shown in FIG. 4C, the stirring shaft portion 20 is configured to have a substantially cylindrical portion 20d having a substantially cylindrical cross section and a flat portion 20e. As shown in FIGS. 4A and 4B, the plane portion 20e is provided between a plurality of support portions 20c provided at a predetermined pitch along the direction of arrow F in FIG. 4A. Furthermore, the flat portions 20e are provided at both ends in the direction of the arrow F in FIG.

本実施形態における撹拌軸部20の略円筒部20dの直径は9mm程度である。また、支持部20cは、図4(a)の矢印F方向に沿って約50mmピッチで5箇所に設けられている。   In this embodiment, the diameter of the substantially cylindrical portion 20d of the stirring shaft portion 20 is about 9 mm. Moreover, the support part 20c is provided in five places at a pitch of about 50 mm along the arrow F direction of Fig.4 (a).

被支持部20bの図4(a)の矢印F方向における外側には図示しない駆動伝達ギアが取り付けられている。この駆動伝達ギアには、画像形成装置2に設けられたモータ等の駆動源から回転駆動力が伝達される。これにより撹拌軸部20は図4(a)の矢印D方向に回転する。   A drive transmission gear (not shown) is attached to the outside of the supported portion 20b in the direction of arrow F in FIG. A rotational driving force is transmitted to the drive transmission gear from a drive source such as a motor provided in the image forming apparatus 2. As a result, the stirring shaft portion 20 rotates in the direction of arrow D in FIG.

図4(b)に示すように、本実施形態の支持部20cはフック形状で構成される。支持部20cは、フック形状の根元側の根元部20fと、フック形状の中間の引っ掛け部20gとを有する。更に、フック形状の先端側の先端部20iと、該先端部20iから引っ掛け部20gに近付くにつれて徐々に幅が広くなる先鋭部からなる誘い込み部20hとを有して構成される。   As shown in FIG.4 (b), the support part 20c of this embodiment is comprised by hook shape. The support portion 20c has a hook-shaped root portion 20f and a hook-shaped intermediate hook portion 20g. Furthermore, it is configured to have a tip portion 20i on the tip side of the hook shape, and a guide portion 20h consisting of a sharpened portion that gradually increases in width as it approaches the hook portion 20g from the tip portion 20i.

根元部20fの図4(b)の矢印F方向の幅は幅W1である。引っ掛け部20gの図4(b)の矢印F方向の幅は幅W2である。先端部20iの図4(b)の矢印F方向の幅は幅W3である。支持部20cの先端部20iは撹拌軸部20の回転方向となる図4(b)の矢印D方向下流側を向いている。   The width of the root portion 20f in the direction of arrow F in FIG. 4B is a width W1. The width of the hook portion 20g in the direction of arrow F in FIG. 4B is a width W2. The width of the tip 20i in the direction of arrow F in FIG. 4B is a width W3. The tip portion 20i of the support portion 20c faces the downstream side in the direction of arrow D in FIG.

図4(c)に示すように、撹拌軸部20の平面部20eに対向する支持部20cの対向面20jは、該平面部20eに対して一定の隙間gを設けている。この隙間gは撹拌シート部19の厚みよりも大きいため、この隙間gに撹拌シート部19を挿入して被支持部19aを支持部20cに挿通することが出来る。   As shown in FIG. 4C, the facing surface 20j of the support portion 20c facing the flat portion 20e of the stirring shaft portion 20 is provided with a certain gap g with respect to the flat portion 20e. Since the gap g is larger than the thickness of the stirring sheet part 19, the stirring sheet part 19 can be inserted into the gap g and the supported part 19a can be inserted into the support part 20c.

図5(b)に示すように撹拌シート部19を撹拌軸部20に組み付けた後、撹拌シート部19は、図4(c)に示す撹拌軸部20の軸線方向から見た状態では、平面部20eと対向面20jとの間に存在する。支持部20cが設けられている固定面20kは、対向面20jに対して平面部20eよりも離れた位置に設けられている。これは支持部20cの部品製造上の理由であり、固定面20kと平面部20eとを同一平面上に設けても良い。   After the stirring sheet portion 19 is assembled to the stirring shaft portion 20 as shown in FIG. 5 (b), the stirring sheet portion 19 is flat when viewed from the axial direction of the stirring shaft portion 20 shown in FIG. 4 (c). It exists between the part 20e and the opposing surface 20j. The fixed surface 20k on which the support portion 20c is provided is provided at a position farther from the flat surface portion 20e than the opposed surface 20j. This is the reason for manufacturing the parts of the support portion 20c, and the fixed surface 20k and the flat portion 20e may be provided on the same plane.

図5(a)に示すように、撹拌シート部19には支持部20cに支持される複数の被支持部19aが複数の支持部20cのピッチに対応して設けられている。被支持部19aは貫通長穴で構成され、該長穴の長手方向となる図5(a)の矢印F方向の幅は幅W4である。   As shown in FIG. 5A, the stirring sheet portion 19 is provided with a plurality of supported portions 19a supported by the support portion 20c corresponding to the pitch of the plurality of support portions 20c. The supported portion 19a is formed of a through hole, and the width in the direction of arrow F in FIG. 5A, which is the longitudinal direction of the slot, is a width W4.

ここで、撹拌シート部19に設けられる被支持部19aの図5(a)の矢印F方向の幅W4と、撹拌軸部20の支持部20cの根元部20fの図4(b)の矢印F方向の幅W1がある。更に、引っ掛け部20gの図4(b)の矢印F方向の幅W2と、先端部20iの図4(b)の矢印F方向の幅W3とがある。それらの関係は以下の数1式に示す通りである。   Here, the width W4 of the supported portion 19a provided in the stirring sheet portion 19 in the direction of arrow F in FIG. 5A and the arrow F in FIG. 4B of the root portion 20f of the supporting portion 20c of the stirring shaft portion 20 are shown. There is a width W1 in the direction. Further, there are a width W2 of the hook portion 20g in the direction of arrow F in FIG. 4B and a width W3 of the tip portion 20i in the direction of arrow F in FIG. 4B. Their relationship is as shown in the following equation (1).

[数1]
W2>W4>W1
W4>W3
[Equation 1]
W2>W4> W1
W4> W3

撹拌シート部19には被支持部19aに対して撹拌軸部20の回転方向となる図5(b)の矢印D方向上流側に突き出る第一撹拌部19bが設けられている。図6(b)に示すように、撹拌部材21が回転中心Pを中心に図6(b)の矢印D方向に回転することにより第一撹拌部19bは現像枠体40内に収納された現像剤Tを撹拌する。   The stirring sheet portion 19 is provided with a first stirring portion 19b that protrudes upstream in the direction of arrow D in FIG. 5B, which is the rotational direction of the stirring shaft portion 20, with respect to the supported portion 19a. As shown in FIG. 6B, the first stirring portion 19b is developed in the developing frame 40 by rotating the stirring member 21 around the rotation center P in the direction of arrow D in FIG. 6B. Agent T is stirred.

また、撹拌シート部19には被支持部19aに対して第一撹拌部19bと反対側に突き出る第二撹拌部19cが設けられている。図6(a)に示すように、撹拌シート部19の第一撹拌部19bと第二撹拌部19cとは一体的に構成される。第一撹拌部19bと第二撹拌部19cとは撹拌軸部20の回転中心Pに対して同一側に設けられている。第二撹拌部19cの回転方向の長さYは、第一撹拌部19bの回転方向の長さXよりも短い。第二撹拌部19cは第一撹拌部19bよりも撹拌軸部20の回転方向となる図6(b)の矢印D方向下流側に設けられる。   Further, the stirring sheet portion 19 is provided with a second stirring portion 19c that protrudes on the opposite side of the supported portion 19a from the first stirring portion 19b. As shown to Fig.6 (a), the 1st stirring part 19b and the 2nd stirring part 19c of the stirring sheet | seat part 19 are comprised integrally. The first stirring portion 19b and the second stirring portion 19c are provided on the same side with respect to the rotation center P of the stirring shaft portion 20. The length Y in the rotation direction of the second stirring unit 19c is shorter than the length X in the rotation direction of the first stirring unit 19b. The second stirring unit 19c is provided downstream of the first stirring unit 19b in the direction of the arrow D in FIG.

撹拌シート部19の剛性(弾性力)を適宜設定する。これにより現像枠体40内に収納された現像剤Tの量が多く撹拌部材21の回転負荷が大きい場合には、図6(c)に示すように、第一撹拌部19bが第二撹拌部19cを覆って撹拌軸部20の外周に巻回される。そして、弾性を有する第二撹拌部19cの腰の強さにより第一撹拌部19bをバックアップして該第一撹拌部19bにより現像剤Tを撹拌する。   The rigidity (elastic force) of the stirring sheet portion 19 is set as appropriate. Accordingly, when the amount of the developer T stored in the developing frame 40 is large and the rotational load of the stirring member 21 is large, as shown in FIG. 6C, the first stirring unit 19b becomes the second stirring unit. It is wound around the outer periphery of the stirring shaft portion 20 so as to cover 19c. The first stirring portion 19b is backed up by the elasticity of the elastic second stirring portion 19c, and the developer T is stirred by the first stirring portion 19b.

一方、現像枠体40内に収納された現像剤Tの量が少なく撹拌部材21の回転負荷が小さい場合には、図6(b)に示すように、第一撹拌部19bに加えて第二撹拌部19cも現像剤Tを撹拌する。   On the other hand, when the amount of the developer T stored in the developing frame 40 is small and the rotational load of the stirring member 21 is small, as shown in FIG. 6B, in addition to the first stirring portion 19b, the second The stirring unit 19c also stirs the developer T.

図6(c)に示すように、第一撹拌部19bが第二撹拌部19cを覆って撹拌軸部20の外周に巻回された状態では該第二撹拌部19cが第一撹拌部19bをバックアップして撹拌軸部20の外周面よりも径方向に突出させた状態で保持している。これにより第一撹拌部19bによる現像剤Tの撹拌循環を良好に保つことが出来る。   As shown in FIG. 6C, in a state where the first stirring unit 19b covers the second stirring unit 19c and is wound around the outer periphery of the stirring shaft unit 20, the second stirring unit 19c moves the first stirring unit 19b. The back-up is held in a state of protruding in the radial direction from the outer peripheral surface of the stirring shaft portion 20. Thereby, the stirring circulation of the developer T by the first stirring unit 19b can be kept good.

図5(a),(b)に示すように、撹拌シート部19の第二撹拌部19cの図5(a),(b)の矢印F方向に沿って所定ピッチで設けられた複数の被支持部19a間(被支持部間)には切り欠き部19dが設けられている。本実施形態の切り欠き部19dは複数の被支持部19a間(被支持部間)の図5(a),(b)の矢印F方向における中央に設けられている。   As shown in FIGS. 5 (a) and 5 (b), a plurality of objects provided at a predetermined pitch along the direction of arrow F in FIGS. 5 (a) and 5 (b) of the second stirring portion 19c of the stirring sheet portion 19. A notch 19d is provided between the support portions 19a (between supported portions). The notch 19d of the present embodiment is provided at the center in the direction of arrow F in FIGS. 5A and 5B between the plurality of supported portions 19a (between supported portions).

撹拌部材21の軸方向となる図5(a)の矢印F方向において第二撹拌部19cの外縁で複数の被支持部19aの間には切り欠き部19dが設けられている。切り欠き部19dは、図8(b)に示す第二撹拌部19cの波打ちを防止するためのものである。本実施形態における切り欠き部19dの図5(a)の矢印F方向の幅W5は2mm程度である。   A cutout portion 19d is provided between the plurality of supported portions 19a on the outer edge of the second stirring portion 19c in the direction of arrow F in FIG. The cutout portion 19d is for preventing the waviness of the second stirring portion 19c shown in FIG. 8 (b). The width W5 in the direction of arrow F in FIG. 5A of the notch 19d in the present embodiment is about 2 mm.

<撹拌シート部の組み付け>
撹拌シート部19を撹拌軸部20に組み付ける際に被支持部19aが図4(b)に示す引っ掛け部20gを通過するときには、被支持部19aが図5(a)の矢印F方向に押し広げられるように弾性変形する。押し広げられた被支持部19aが引っ掛け部20gを通過して根元部20fに至ると被支持部19aが復元する。これにより図5(b)に示すように、撹拌シート部19の被支持部19aが撹拌軸部20の支持部20cに係止される。
<Assembly of stirring sheet part>
When the supported portion 19a passes through the hook portion 20g shown in FIG. 4 (b) when the stirring sheet portion 19 is assembled to the stirring shaft portion 20, the supported portion 19a expands in the direction of arrow F in FIG. 5 (a). It will be elastically deformed. When the supported portion 19a that has been spread passes through the hook portion 20g and reaches the root portion 20f, the supported portion 19a is restored. As a result, as shown in FIG. 5B, the supported portion 19 a of the stirring sheet portion 19 is locked to the support portion 20 c of the stirring shaft portion 20.

その後、撹拌軸部20が図5(b)の矢印D方向に回転する。すると、撹拌シート部19の第一撹拌部19bは現像剤Tから受ける抵抗Zにより撹拌軸部20の回転方向となる図6(b)の矢印D方向上流側に撓められる。このとき図6(b)に示すように、支持部20cの先端部20iが撹拌軸部20の回転方向となる図6(b)の矢印D方向下流側を向いている。このため第二撹拌部19cは現像剤Tから受ける抵抗Zにより撹拌軸部20の回転方向となる図6(b)の矢印D方向上流側に撓められる。   Thereafter, the stirring shaft portion 20 rotates in the direction of arrow D in FIG. Then, the first stirring portion 19b of the stirring sheet portion 19 is deflected upstream by the resistance Z received from the developer T in the direction of the arrow D in FIG. At this time, as shown in FIG. 6B, the tip 20i of the support portion 20c faces the downstream side in the direction of arrow D in FIG. For this reason, the second stirring portion 19c is deflected by the resistance Z received from the developer T to the upstream side in the direction of the arrow D in FIG.

これにより撹拌部材21が回転しても撹拌シート部19の被支持部19aを支持部20cの根元部20fから先端部20iに向かわせる力は働かない。従って、撹拌部材21の回転中に撹拌シート部19が撹拌軸部20から外れることはない。   Thereby, even if the stirring member 21 rotates, the force for moving the supported portion 19a of the stirring sheet portion 19 from the root portion 20f of the support portion 20c toward the tip portion 20i does not work. Therefore, the stirring sheet portion 19 does not come off the stirring shaft portion 20 while the stirring member 21 is rotating.

図5(b)に示すように、撹拌軸部20に設けられた支持部20cの先端部20i側から撹拌シート部19の被支持部19aを嵌入して組み付ける。これにより撹拌部材21が形成される。   As shown in FIG. 5B, the supported portion 19 a of the stirring sheet portion 19 is fitted and assembled from the tip portion 20 i side of the supporting portion 20 c provided on the stirring shaft portion 20. Thereby, the stirring member 21 is formed.

撹拌シート部19の材質は、ポリエチレンテレフタレート(PET;Polyethylene Terephthalate)、ポリフェニレンスルファイド(PPS;Poly Phenylene Sulfide)が適用可能である。更に、ポリエチレン(PE;polyethylene)、ポリプロピレン(PP;Polypropylene)等が適用可能である。撹拌シート部19の厚みは0.03mm〜0.15mmのものを適宜選定すれば良い。また、前述の材質を基材として表層にシーラント層をラミネートしたものでも良い。   As the material of the stirring sheet portion 19, polyethylene terephthalate (PET) or polyphenylene sulfide (PPS) can be applied. Furthermore, polyethylene (PE), polypropylene (PP), etc. are applicable. The thickness of the stirring sheet portion 19 may be appropriately selected from 0.03 mm to 0.15 mm. Further, a material obtained by laminating a sealant layer on the surface layer using the above-described material as a base material may be used.

<撹拌手段の回転時の挙動>
次に図6〜図9を用いて撹拌部材21の回転時の挙動について説明する。図6及び図7は撹拌部材21の回転中の挙動を本実施形態と比較例1、2とを比較して説明する断面説明図である。図6(a)は本実施形態において撹拌部材21が回転する前の状態を示す断面説明図である。図6(b)は本実施形態において撹拌部材21が回転し始めた直後の状態を示す断面説明図である。図6(c)は本実施形態において撹拌部材21が回転している状態を示す断面説明図である。
<Behavior during rotation of stirring means>
Next, the behavior of the stirring member 21 during rotation will be described with reference to FIGS. 6 and 7 are cross-sectional explanatory views for explaining the behavior of the stirring member 21 during rotation by comparing this embodiment with Comparative Examples 1 and 2. FIG. FIG. 6A is a cross-sectional explanatory view showing a state before the stirring member 21 rotates in the present embodiment. FIG. 6B is a cross-sectional explanatory view showing a state immediately after the stirring member 21 starts to rotate in the present embodiment. FIG. 6C is an explanatory cross-sectional view showing a state in which the stirring member 21 is rotating in the present embodiment.

図7(a)は比較例1において撹拌部材21が回転している状態を示す断面説明図である。図7(b)は比較例2において撹拌部材21が回転している状態を示す断面説明図である。   FIG. 7A is an explanatory cross-sectional view showing a state in which the stirring member 21 is rotating in the first comparative example. FIG. 7B is an explanatory sectional view showing a state in which the stirring member 21 is rotating in the second comparative example.

図6(a)に示すように、撹拌シート部19の第一撹拌部19bは以下の通り構成される。撹拌軸部20の略円筒部20dと平面部20eとの交点のうち、支持部20cに対して撹拌軸部20の回転方向となる図6(a)の矢印D方向上流側にある点Mから第一撹拌部19bの回転方向に長さXだけ突出している。   As shown to Fig.6 (a), the 1st stirring part 19b of the stirring sheet | seat part 19 is comprised as follows. From the intersection M between the substantially cylindrical portion 20d of the stirring shaft portion 20 and the flat portion 20e, from a point M on the upstream side in the direction of arrow D in FIG. 6A, which is the rotation direction of the stirring shaft portion 20 with respect to the support portion 20c. It protrudes by a length X in the rotation direction of the first stirring unit 19b.

また、撹拌シート部19の第二撹拌部19cは、撹拌軸部20の支持部20cの先端部20iから第二撹拌部19cの回転方向に長さYだけ突出している。本実施形態における第一撹拌部19bの回転方向の突出長さXは、撹拌軸部20の周長よりも長い30mm以上に設定される。また、第二撹拌部19cの回転方向の突出長さYは、1mm〜10mm程度である。   Further, the second stirring portion 19c of the stirring sheet portion 19 protrudes from the tip portion 20i of the support portion 20c of the stirring shaft portion 20 by a length Y in the rotation direction of the second stirring portion 19c. The protrusion length X in the rotation direction of the first stirring portion 19b in the present embodiment is set to 30 mm or longer, which is longer than the circumferential length of the stirring shaft portion 20. Moreover, the protrusion length Y of the rotation direction of the 2nd stirring part 19c is about 1 mm-10 mm.

次に、図6(b)に示すように、撹拌部材21が図6(b)の矢印D方向に回転し始めると第二撹拌部19cは現像枠体40内に収容された現像剤Tから抵抗Zを受ける。これにより第二撹拌部19cは先端部20iを支点として撹拌部材21の回転方向となる図6(b)の矢印D方向上流側に撓む。同様に第一撹拌部19bも現像剤Tから受ける抵抗Zにより点Mを支点として撹拌部材21の回転方向となる図6(b)の矢印D方向上流側に撓む。   Next, as shown in FIG. 6B, when the stirring member 21 starts to rotate in the direction of arrow D in FIG. 6B, the second stirring portion 19 c is removed from the developer T contained in the developing device frame 40. Receives resistance Z. As a result, the second stirring portion 19c bends upstream in the direction of the arrow D in FIG. 6B, which is the rotational direction of the stirring member 21, with the tip portion 20i as a fulcrum. Similarly, the first stirring portion 19b is also bent by the resistance Z received from the developer T toward the upstream side in the direction of arrow D in FIG.

次に、図6(c)に示すように、撹拌部材21が更に図6(c)の矢印D方向に回転する。すると、第一撹拌部19bが現像剤Tから受ける抵抗Zにより撹拌部材21の回転方向となる図6(c)の矢印D方向上流側に撓み続ける。そして、第一撹拌部19bが撹拌軸部20の略円筒部20dに近接するように円弧形状になる。そして、第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図6(c)の矢印D方向上流側に位置するようになる。   Next, as shown in FIG. 6 (c), the stirring member 21 further rotates in the direction of arrow D in FIG. 6 (c). Then, the first stirring portion 19b continues to bend in the direction of arrow D in FIG. 6C, which is the rotational direction of the stirring member 21, due to the resistance Z received from the developer T. The first stirring portion 19b has an arc shape so as to be close to the substantially cylindrical portion 20d of the stirring shaft portion 20. And the front-end | tip part Q of the 1st stirring part 19b comes to be located in the arrow D direction upstream of FIG.6 (c) used as the rotation direction of the stirring member 21 rather than the front-end | tip part U of the 2nd stirring part 19c.

このとき、撹拌シート部19の第一撹拌部19bと撹拌軸部20との間には撹拌部材21の回転方向となる図6(c)の矢印D方向上流側に撓められた第二撹拌部19cが存在する。そのため、撹拌軸部20の回転中心Pからの撹拌シート部19の回転軌跡の最大半径R1は、撹拌軸部20の略円筒部20dに近接する撹拌シート部19の回転軌跡の最小半径(撹拌軸部20の回転軌跡の最大半径)R2よりも大きくなる。つまり、以下の数2式で示す関係となる。   At this time, between the first stirring portion 19b and the stirring shaft portion 20 of the stirring sheet portion 19, the second stirring is deflected upstream in the direction of arrow D in FIG. Part 19c is present. Therefore, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 from the rotation center P of the stirring shaft portion 20 is the minimum radius (the stirring shaft of the rotation locus of the stirring sheet portion 19 close to the substantially cylindrical portion 20d of the stirring shaft portion 20). The maximum radius of the rotation trajectory of the portion 20) R2. That is, the relationship shown by the following formula 2 is established.

[数2]
R1>R2
[Equation 2]
R1> R2

例えば、比較例1として図7(a)に示すように、撹拌シート部19に第二撹拌部19cを設けずに薄くて安い剛性の低い撹拌シート部19を用いる。その場合、現像剤Tから受ける抵抗Zにより撹拌シート部19の回転軌跡の最大半径R1と回転軌跡の最小半径R2とは略同等になる。   For example, as shown in FIG. 7A as the comparative example 1, the stirring sheet portion 19 is not provided with the second stirring portion 19c, and a thin and inexpensive stirring sheet portion 19 having low rigidity is used. In that case, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 and the minimum radius R2 of the rotation locus are substantially equal due to the resistance Z received from the developer T.

これに対して、図6(c)に示す本実施形態では、撹拌シート部19に第二撹拌部19cを設けることで撹拌シート部19の回転軌跡の最大半径R1を撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができる。   On the other hand, in the present embodiment shown in FIG. 6C, the second stirring portion 19c is provided in the stirring sheet portion 19 so that the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is set to the rotation locus of the stirring shaft portion 20. Can be made larger than the maximum radius R2.

また、第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図6(c)の矢印D方向上流側に位置する。このため第二撹拌部19cの周辺を滑らかに第一撹拌部19bで覆うことができる。このとき、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲は撹拌軸部20の回転中心Pを中心とした角度θ1である。   Moreover, the front-end | tip part Q of the 1st stirring part 19b is located in the arrow D direction upstream of FIG.6 (c) used as the rotation direction of the stirring member 21 rather than the front-end | tip part U of the 2nd stirring part 19c. For this reason, the periphery of the 2nd stirring part 19c can be smoothly covered with the 1st stirring part 19b. At this time, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 is an angle θ1 around the rotation center P of the stirring shaft portion 20.

これに対して、例えば、比較例2として図7(b)に示すように、第一撹拌部19bが短くて第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図7(b)の矢印D方向下流側に位置する場合がある。その場合、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲は撹拌軸部20の回転中心Pを中心とした角度θ2である。つまり、図6(c)に示す本実施形態の角度θ1と、図7(b)に示す比較例2の角度θ2とは以下の数3式で示す関係となる。   On the other hand, for example, as shown in FIG. 7B as Comparative Example 2, the first stirring portion 19b is short, and the tip Q of the first stirring portion 19b is more than the tip U of the second stirring portion 19c. In some cases, the stirring member 21 is located downstream in the direction of arrow D in FIG. In this case, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 is an angle θ2 around the rotation center P of the stirring shaft portion 20. That is, the angle θ1 of the present embodiment shown in FIG. 6C and the angle θ2 of the comparative example 2 shown in FIG.

[数3]
θ1>θ2
[Equation 3]
θ1> θ2

従って、図6(c)に示す本実施形態では、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲(角度θ1)を広くすることができる。撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲を広くすることで、撹拌軸部20が一回転する間に撹拌できる現像剤Tの量を多くすることができる。   Therefore, in this embodiment shown in FIG. 6C, the range (angle θ1) in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 is widened. Can do. By widening the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20, the developer T that can be stirred while the stirring shaft portion 20 makes one rotation. The amount can be increased.

この構成により、薄くて安い撹拌シート部19を用いた場合でも、撹拌シート部19の回転軌跡の最大半径R1を撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができる。また、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲を広くすることができる。従って、現像剤Tから受ける抵抗Zに負けずに良好な現像剤Tの撹拌循環を実現し、濃度ムラのない現像装置38を提供することができる。   With this configuration, even when the thin and cheap stirring sheet portion 19 is used, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 can be made larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20. Further, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 can be widened. Therefore, it is possible to provide a developing device 38 that achieves satisfactory stirring and circulation of the developer T without losing the resistance Z received from the developer T and has no density unevenness.

次に、図8及び図9を用いて撹拌部材21が回転した際の第二撹拌部19cの変形について本実施形態と比較例3とを比較しながら説明する。図8は比較例3として第二撹拌部19cに切り欠き部19dを設けない構成において撹拌部材21が回転した際の第二撹拌部19cの変形を示す。図8(a)は比較例3において第二撹拌部19cに切り欠き部19dを設けない撹拌部材21の構成を示す平面説明図である。図8(b)は図8(a)に示す矢印E1方向から見た第二撹拌部19cの先端部Uの変形を説明する側面説明図である。図8(c)は図8(b)に示す矢印E2方向から見た断面説明図である。   Next, deformation of the second stirring portion 19c when the stirring member 21 rotates will be described with reference to FIGS. 8 and 9 while comparing the present embodiment with the comparative example 3. FIG. FIG. 8 shows a deformation of the second stirring portion 19c when the stirring member 21 rotates in a configuration in which the notch portion 19d is not provided in the second stirring portion 19c as Comparative Example 3. FIG. 8A is an explanatory plan view showing the configuration of the agitating member 21 in the comparative example 3 in which the second agitating portion 19c is not provided with the notched portion 19d. FIG. 8B is an explanatory side view for explaining the deformation of the distal end portion U of the second stirring portion 19c viewed from the direction of the arrow E1 shown in FIG. FIG. 8C is a cross-sectional explanatory view seen from the direction of the arrow E2 shown in FIG.

図9は本実施形態の第二撹拌部19cに切り欠き部19dを設けた構成において撹拌部材21が回転した際の第二撹拌部19cの変形を示す。図9(a)は本実施形態において第二撹拌部19cに切り欠き部19dを設けた撹拌部材21の構成を示す平面説明図である。図9(b)は図9(a)に示す矢印E1方向から見た第二撹拌部19cの先端部Uの変形を説明する側面説明図である。図9(c)は図9(b)に示す矢印E2方向から見た断面説明図である。   FIG. 9 shows a deformation of the second stirring portion 19c when the stirring member 21 rotates in the configuration in which the notch portion 19d is provided in the second stirring portion 19c of the present embodiment. FIG. 9A is an explanatory plan view showing the configuration of the stirring member 21 in which the notch portion 19d is provided in the second stirring portion 19c in the present embodiment. FIG. 9B is an explanatory side view for explaining the deformation of the distal end portion U of the second stirring portion 19c as viewed from the direction of the arrow E1 shown in FIG. FIG. 9C is a cross-sectional explanatory view seen from the direction of the arrow E2 shown in FIG.

先ず、比較例3として図8(a)に示すように第二撹拌部19cに切り欠き部19dを設けない場合の構成について説明する。撹拌軸部20の支持部20cが撹拌シート部19の被支持部19aを支持している。撹拌軸部20が回転方向となる図8(c)の矢印D方向に回転し始めると、図8(b)に示すように、第二撹拌部19cの先端部Uは図8(c)に示す現像剤Tから受ける抵抗Zにより変形する。   First, as a comparative example 3, a configuration in the case where the notch portion 19d is not provided in the second stirring portion 19c as shown in FIG. The support portion 20 c of the stirring shaft portion 20 supports the supported portion 19 a of the stirring sheet portion 19. When the stirring shaft portion 20 starts to rotate in the direction of arrow D in FIG. 8C, which is the rotational direction, as shown in FIG. 8B, the tip U of the second stirring portion 19c is in FIG. 8C. It is deformed by the resistance Z received from the developer T shown.

このとき、図8(c)に示すように、撹拌軸部20の軸方向となる図8(b)の矢印F方向において撹拌軸部20の支持部20cの近傍における第二撹拌部19cの先端部U1と、撹拌軸部20の平面部20eを含む平面5との間に隙間C1ができる。   At this time, as shown in FIG. 8C, the tip of the second stirring portion 19c in the vicinity of the support portion 20c of the stirring shaft portion 20 in the direction of arrow F in FIG. 8B, which is the axial direction of the stirring shaft portion 20. A gap C1 is formed between the portion U1 and the flat surface 5 including the flat portion 20e of the stirring shaft portion 20.

また、図8(c)に示すように、撹拌軸部20の図8(b)の矢印F方向において隣り合った支持部20cの中間付近における第二撹拌部19cの先端部U2と、撹拌軸部20の平面部20eを含む平面5との間に隙間C2ができる。図8(c)に示す前記隙間C1と隙間C2とは以下の数4式に示す関係である。   Further, as shown in FIG. 8C, the tip U2 of the second stirring portion 19c in the vicinity of the middle of the support portions 20c adjacent to each other in the arrow F direction in FIG. A gap C <b> 2 is formed between the flat surface 5 including the flat portion 20 e of the portion 20. The gap C1 and the gap C2 shown in FIG. 8 (c) have the relationship shown in the following equation (4).

[数4]
C1<C2
[Equation 4]
C1 <C2

これは、支持部20cの近傍では現像剤Tの抵抗Zを受ける先端部U1と支持部20cとの離間距離が短く、先端部U1が変形し難い。それに対して、図8(b)の矢印F方向において隣り合った支持部20cの中間付近では現像剤Tの抵抗Zを受ける先端部U2と支持部20cとの離間距離が長く、先端部U2が変形し易いためである。   This is because in the vicinity of the support portion 20c, the distance between the tip portion U1 that receives the resistance Z of the developer T and the support portion 20c is short, and the tip portion U1 is difficult to deform. On the other hand, in the vicinity of the middle of the support portions 20c adjacent to each other in the direction of arrow F in FIG. 8B, the distance between the tip portion U2 receiving the resistance Z of the developer T and the support portion 20c is long, and the tip portion U2 is This is because it is easily deformed.

このように、撹拌軸部20の平面部20eを含む平面5と第二撹拌部19cの先端部U1,U2との間の隙間C1,C2が撹拌軸部20の軸方向(図8(b)の左右方向)の位置によって異なる。このため図8(b)に示すように、撹拌シート部19の第二撹拌部19cに波打ちが発生する。第二撹拌部19cに波打ちが発生した場合、第二撹拌部19cの撹拌軸部20の回転方向となる図8(c)の矢印D方向上流側への曲げ剛性が高くなる。このため第二撹拌部19cが撓み難くなる。   Thus, the gaps C1 and C2 between the flat surface 5 including the flat portion 20e of the stirring shaft portion 20 and the tips U1 and U2 of the second stirring portion 19c are axial directions of the stirring shaft portion 20 (FIG. 8B). Depending on the position in the horizontal direction). For this reason, as shown in FIG. 8B, undulation occurs in the second stirring portion 19 c of the stirring sheet portion 19. When undulation occurs in the second stirring portion 19c, the bending rigidity toward the upstream side in the direction of arrow D in FIG. 8C, which is the rotational direction of the stirring shaft portion 20 of the second stirring portion 19c, is increased. For this reason, it becomes difficult for the 2nd stirring part 19c to bend.

ここで、図8(c)に図8(b)に示す矢印E2方向から見た第二撹拌部19cの変形の様子を示す。尚、説明の都合上、図8(c)では第二撹拌部19cの支持部20cの近傍における変形と、図8(b)の矢印F方向において隣り合う支持部20cの中間付近における変形とを同一の図に示す。   Here, FIG. 8C shows a state of deformation of the second stirring portion 19c viewed from the direction of the arrow E2 shown in FIG. 8B. For convenience of explanation, in FIG. 8C, the deformation in the vicinity of the support portion 20c of the second stirring portion 19c and the deformation in the vicinity of the intermediate portion of the adjacent support portion 20c in the direction of arrow F in FIG. Shown in the same figure.

図8(c)に示すように、第二撹拌部19cの被支持部19aから遠い先端部U2は撹拌軸部20の支持部20cから遠いため変形量が大きく、波打ちも大きい。また、第二撹拌部19cの被支持部19aに近い先端部U1は撹拌軸部20の支持部20cに近いため変形量が小さく、波打ちも小さい。   As shown in FIG. 8C, the distal end U2 far from the supported portion 19a of the second agitating portion 19c is far from the supporting portion 20c of the agitating shaft portion 20, so that the deformation amount is large and the undulation is also large. Moreover, since the front-end | tip part U1 close | similar to the to-be-supported part 19a of the 2nd stirring part 19c is close to the support part 20c of the stirring shaft part 20, the deformation amount is small and the undulation is also small.

そのため第二撹拌部19cの被支持部19aから遠い先端部U2では撹拌軸部20の回転方向となる図8(c)の矢印D方向上流側への曲げ剛性が高い。一方、第二撹拌部19cの被支持部19aに近い先端部U1では撹拌軸部20の回転方向となる図8(c)の矢印D方向上流側への曲げ剛性が低い。   For this reason, the distal end portion U2 of the second stirring portion 19c far from the supported portion 19a has a high bending rigidity toward the upstream side in the direction of arrow D in FIG. On the other hand, the distal end portion U1 of the second stirring portion 19c close to the supported portion 19a has a low bending rigidity upstream in the direction of arrow D in FIG.

従って、撹拌部材21が図8(c)の矢印D方向に回転する際に第二撹拌部19cの被支持部19aから遠い先端部U2が撹拌軸部20の回転方向となる図8(c)の矢印D方向上流側に撓み難くなり、現像剤Tから受ける抵抗Zが大きくなり過ぎる。そのため、第二撹拌部19cに大きな力が加わり、撹拌シート部19は剛性の低い第二撹拌部19cの被支持部19aに近い先端部U1に応力が集中して折れ曲がり、塑性変形する可能性がある。   Therefore, when the stirring member 21 rotates in the direction of arrow D in FIG. 8C, the tip U2 far from the supported portion 19a of the second stirring portion 19c becomes the rotation direction of the stirring shaft portion 20 (FIG. 8C). Therefore, the resistance Z received from the developer T becomes too large. Therefore, a large force is applied to the second agitating portion 19c, and the agitating sheet portion 19 may be bent due to stress concentration at the tip U1 near the supported portion 19a of the second agitating portion 19c having low rigidity, and may be plastically deformed. is there.

また、撹拌部材21が回転する際の現像剤Tから受ける抵抗Zが大きくなり過ぎて撹拌シート部19を支持する撹拌軸部20の支持部20cに大きな力が加わって破損する可能性がある。これに対して、本実施形態における撹拌シート部19は、第二撹拌部19cの先端部Uに波打ちが発生しないように、第二撹拌部19cの図9(a)の矢印F方向における複数の被支持部19aの間に切り欠き部19dを有している。   Further, the resistance Z received from the developer T when the stirring member 21 rotates may become too large, and a large force may be applied to the support portion 20c of the stirring shaft portion 20 that supports the stirring sheet portion 19 to cause damage. On the other hand, the stirring sheet portion 19 in the present embodiment includes a plurality of second stirring portions 19c in the direction of arrow F in FIG. 9A so as not to generate undulations at the tip U of the second stirring portion 19c. A notched portion 19d is provided between the supported portions 19a.

次に、図9(a)に示すように、第二撹拌部19cに切り欠き部19dを設けた場合の作用効果について説明する。撹拌軸部20の支持部20cにより撹拌シート部19の被支持部19aを支持している。撹拌軸部20が図9(c)の矢印D方向に回転し始めると、図9(b)に示すように第二撹拌部19cは現像剤Tから受ける抵抗Zにより全体的に撹拌軸部20の回転方向となる図9(c)の矢印D方向上流側に撓められる。   Next, as shown in FIG. 9 (a), a description will be given of the operational effect when the notch portion 19d is provided in the second stirring portion 19c. The supported portion 19 a of the stirring sheet portion 19 is supported by the support portion 20 c of the stirring shaft portion 20. When the stirring shaft portion 20 starts to rotate in the direction of arrow D in FIG. 9C, the second stirring portion 19c is totally driven by the resistance Z received from the developer T as shown in FIG. 9B. It is bent to the upstream in the direction of arrow D in FIG.

このとき、図9(c)に示すように、撹拌軸部20の軸方向(図9(b)の矢印F方向)において撹拌軸部20の支持部20cの近傍における第二撹拌部19cの先端部U1と、撹拌軸部20の平面部20eを含む平面5との間に隙間C3ができる。   At this time, as shown in FIG. 9C, the tip of the second stirring portion 19c in the vicinity of the support portion 20c of the stirring shaft portion 20 in the axial direction of the stirring shaft portion 20 (the direction of arrow F in FIG. 9B). A gap C3 is formed between the portion U1 and the flat surface 5 including the flat portion 20e of the stirring shaft portion 20.

また、図9(c)に示すように、切り欠き部19dの近傍における第二撹拌部19cの先端部U2と、撹拌軸部20の平面部20eを含む平面5との間に隙間C4ができる。図9(c)に示す前記隙間C3と隙間C4とは以下の数5式に示す関係である。   Further, as shown in FIG. 9C, a gap C4 is formed between the tip U2 of the second stirring portion 19c in the vicinity of the notch portion 19d and the flat surface 5 including the flat portion 20e of the stirring shaft portion 20. . The gap C3 and the gap C4 shown in FIG. 9C have the relationship shown in the following formula (5).

[数5]
C3<C4
[Equation 5]
C3 <C4

また、図8(c)に示す隙間C1と隙間C2との差と、図9(c)に示す隙間C3と隙間C4との差は以下の数6式に示す関係である。   Further, the difference between the gap C1 and the gap C2 shown in FIG. 8C and the difference between the gap C3 and the gap C4 shown in FIG. 9C are expressed by the following equation (6).

[数6]
(C2−C1)>(C4−C3)
[Equation 6]
(C2-C1)> (C4-C3)

これは、支持部20cの近傍では現像剤Tの抵抗Zを受ける先端部U1と支持部20cとの離間距離が短く、先端部U1が変形し難い。それに対して、切り欠き部19dの近傍では現像剤Tの抵抗Zを受ける先端部U2と支持部20cとの離間距離が長く、先端部U2が変形し易いためである。   This is because in the vicinity of the support portion 20c, the distance between the tip portion U1 that receives the resistance Z of the developer T and the support portion 20c is short, and the tip portion U1 is difficult to deform. On the other hand, in the vicinity of the notch portion 19d, the distance between the tip portion U2 receiving the resistance Z of the developer T and the support portion 20c is long, and the tip portion U2 is easily deformed.

このように、第二撹拌部19cの先端部Uの変形量に撹拌軸部20の軸方向(図9(b)の矢印F方向)において差がある。その場合でも、第二撹拌部19cは切り欠き部19dにより撹拌軸部20の軸方向(図9(b)の矢印F方向)で複数に分断されている。このため変曲点を持たない。   Thus, there is a difference in the amount of deformation of the tip U of the second stirring portion 19c in the axial direction of the stirring shaft portion 20 (the direction of arrow F in FIG. 9B). Even in that case, the second stirring portion 19c is divided into a plurality of portions in the axial direction of the stirring shaft portion 20 (the direction of the arrow F in FIG. 9B) by the notch portion 19d. For this reason, it has no inflection point.

従って、第二撹拌部19cには波打ちが発生しない。そのため第二撹拌部19cの撹拌軸部20の回転方向となる図9(c)の矢印D方向上流側への曲げ剛性は、被支持部19aの近傍の第二撹拌部19cの先端部U1でも、切り欠き部19dの近傍の第二撹拌部19cの先端部U2でも同等である。   Therefore, no undulation occurs in the second stirring portion 19c. Therefore, the bending rigidity toward the upstream side in the direction of arrow D in FIG. 9 (c), which is the rotation direction of the stirring shaft portion 20 of the second stirring portion 19c, is also the tip U1 of the second stirring portion 19c in the vicinity of the supported portion 19a. The same applies to the tip end portion U2 of the second stirring portion 19c in the vicinity of the notch portion 19d.

従って、図9(c)に示すように、第二撹拌部19cは現像剤Tから受ける抵抗Zにより撹拌軸部20の回転方向となる図9(c)の矢印D方向上流側に滑らかに撓められる。従って、図8に示す比較例3のように撹拌シート部19が被支持部19aの近傍から折れ曲がって塑性変形することはない。また、撹拌軸部20の支持部20cに大きな力が加わって破損することがない。   Therefore, as shown in FIG. 9 (c), the second stirring portion 19c is smoothly deflected to the upstream side in the direction of arrow D in FIG. 9 (c), which is the rotational direction of the stirring shaft portion 20, by the resistance Z received from the developer T. It is Therefore, unlike the comparative example 3 shown in FIG. 8, the stirring sheet portion 19 is not bent from the vicinity of the supported portion 19a and plastically deformed. In addition, a large force is not applied to the support portion 20c of the stirring shaft portion 20 to cause damage.

尚、図8に示す比較例3のように、撹拌シート部19に切り欠き部19dを設けない場合、第二撹拌部19cに形成される波打ちの山の頂点は、撹拌軸部20の軸方向(図8(b)の左右方向)に沿って隣設される被支持部19aの中央に発生する。   Note that, as in Comparative Example 3 shown in FIG. 8, when the notched portion 19 d is not provided in the stirring sheet portion 19, the peak of the undulation peak formed in the second stirring portion 19 c is the axial direction of the stirring shaft portion 20. It occurs at the center of the supported portion 19a provided adjacently along (the left-right direction in FIG. 8B).

そのため図9に示す本実施形態のように、撹拌シート部19に切り欠き部19dを設ける場合には、該切り欠き部19dを撹拌軸部20の軸方向(図9(b)の左右方向)に沿って隣設される被支持部19aの中央に設けることが望ましい。また、図8(b)の比較例3に示すように、第二撹拌部19cに形成される波打ちは第二撹拌部19cの被支持部19aに近い部分を起点に発生する。このため図9(a)の本実施形態に示すように、第二撹拌部19cの先端部Uからの切り欠き部19dの深さN1は、第二撹拌部19cの先端部Uから被支持部19aまでの離間距離N2の0.5倍〜1.5倍程度であることが望ましい。第二撹拌部19cの先端部Uからの切り欠き部19dの深さN1が、第二撹拌部19cの先端部Uから被支持部19aまでの離間距離N2よりも大きければ更に好ましい。   Therefore, when the notch 19d is provided in the stirring sheet portion 19 as in the present embodiment shown in FIG. 9, the notch 19d is disposed in the axial direction of the stirring shaft 20 (the left-right direction in FIG. 9B). It is desirable to provide it at the center of the supported portion 19a that is provided along the line. Further, as shown in Comparative Example 3 in FIG. 8B, the waviness formed in the second stirring portion 19c is generated from a portion near the supported portion 19a of the second stirring portion 19c. For this reason, as shown in this embodiment of FIG. 9A, the depth N1 of the notch portion 19d from the distal end portion U of the second stirring portion 19c is from the distal end portion U of the second stirring portion 19c to the supported portion. It is desirable to be about 0.5 to 1.5 times the separation distance N2 up to 19a. More preferably, the depth N1 of the notch 19d from the tip U of the second stirring part 19c is greater than the separation distance N2 from the tip U of the second stirring part 19c to the supported part 19a.

上記構成により、撹拌シート部19に第二撹拌部19cを設ける場合でも、第二撹拌部19cの波打ちを抑制し、部品を破損させることなく良好な現像剤Tの撹拌循環を実現し、濃度ムラのない現像装置38を提供することができる。   With the above configuration, even when the second agitating portion 19c is provided in the agitating sheet portion 19, the waviness of the second agitating portion 19c is suppressed, and a good agitation circulation of the developer T is realized without damaging the parts. It is possible to provide the developing device 38 without the above.

本実施形態では、薄くて安い剛性の低い撹拌シート部19を用いた場合でも、撹拌軸部20を中心とした撹拌シート部19の回転軌跡を該撹拌軸部20の回転軌跡よりも広い範囲で大きくすることができる。そのため、撹拌軸部20が一回転する間に撹拌できる現像剤Tの量を多くすることができ、現像剤Tから受ける抵抗Zに負けずに良好な現像剤Tの撹拌循環を実現した濃度ムラのない良好な画像を出力することができる現像装置38を提供することができる。   In the present embodiment, even when the stirring sheet portion 19 is thin and cheap and has low rigidity, the rotation locus of the stirring sheet portion 19 around the stirring shaft portion 20 is wider than the rotation locus of the stirring shaft portion 20. Can be bigger. Therefore, the amount of the developer T that can be stirred while the stirring shaft portion 20 makes one rotation can be increased, and the density unevenness that realizes good stirring circulation of the developer T without losing the resistance Z received from the developer T. Thus, it is possible to provide the developing device 38 that can output a good image without any problem.

また、撹拌シート部19の図9(a)の矢印F方向における被支持部19aの間に切り欠き部19dを設ける。これにより第二撹拌部19cの波打ちを抑制し、撹拌軸部20の支持部20cを破損させることなく良好な現像剤Tの撹拌循環を実現し、濃度ムラのない現像装置38を提供することができる。   Further, a notch portion 19d is provided between the supported portion 19a of the stirring sheet portion 19 in the direction of arrow F in FIG. As a result, it is possible to suppress the undulation of the second agitating portion 19c, realize a good agitation circulation of the developer T without damaging the support portion 20c of the agitating shaft portion 20, and provide a developing device 38 having no density unevenness. it can.

次に、図10(a)を用いて本発明に係る現像装置、現像剤収納ユニット及び画像形成装置の第2実施形態の構成について説明する。尚、前記第1実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of the second embodiment of the developing device, developer storage unit, and image forming apparatus according to the present invention will be described with reference to FIG. In addition, what was comprised similarly to the said 1st Embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

前記第1実施形態では、図9(a)に示すように、撹拌シート部19に設ける切り欠き部19dの撹拌軸部20の軸方向(図9(a)の矢印F方向)の幅W5を2mm程度に設定した一例について説明した。   In the first embodiment, as shown in FIG. 9A, the width W5 in the axial direction (in the direction of arrow F in FIG. 9A) of the stirring shaft portion 20 of the notch portion 19d provided in the stirring sheet portion 19 is set. The example which set to about 2 mm was demonstrated.

しかし、前記第1実施形態と同様な効果を得るために切り欠き部19dの撹拌軸部20の軸方向(図9(a)の矢印F方向)の幅W5は2mm程度に限定する必要はない。前述したように撹拌シート部19の第二撹拌部19cに波打ちが発生しない程度であれば、図10(a)に示すように、切り欠き部119fは幅が殆ど無い切れ込みが入っているだけでも良い。他の構成は前記第1実施形態と同様に構成され、同様の効果を得ることが出来る。   However, in order to obtain the same effect as that of the first embodiment, the width W5 in the axial direction (direction of arrow F in FIG. 9A) of the stirring shaft portion 20 of the notch portion 19d need not be limited to about 2 mm. . As described above, if the waviness does not occur in the second stirring portion 19c of the stirring sheet portion 19, as shown in FIG. good. Other configurations are the same as those in the first embodiment, and the same effects can be obtained.

次に、図10(b)を用いて本発明に係る現像装置、現像剤収納ユニット及び画像形成装置の第3実施形態の構成について説明する。尚、前記各実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of the third embodiment of the developing device, developer storage unit, and image forming apparatus according to the present invention will be described with reference to FIG. In addition, what was comprised similarly to each said embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

本実施形態の切り欠き部119dは、図10(b)に示すように、撹拌軸部20の回転軸方向(図10(b)の左右方向)に沿って隣設される撹拌シート部119の被支持部119a間(被支持部材間)の離間幅となるピッチKに対して以下の通りである。即ち、切り欠き部119dの撹拌軸部20の回転軸方向(図10(b)の左右方向)における幅Lが1/2以下の長さに設定したものである。幅LがピッチKに対して1/10以下であればより好ましい。図10(b)に示す構成であれば、図6(c)に示すと同様に、撹拌シート部119の回転軌跡の最大半径R1が、撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができる。   As shown in FIG. 10 (b), the notch portion 119d of the present embodiment is provided between the stirring sheet portion 119 provided adjacently along the rotation axis direction of the stirring shaft portion 20 (left-right direction in FIG. 10 (b)). It is as follows with respect to the pitch K used as the separation width between the supported parts 119a (between supported members). That is, the width L of the notch 119d in the rotation axis direction of the stirring shaft portion 20 (left and right direction in FIG. 10B) is set to a length of 1/2 or less. More preferably, the width L is 1/10 or less of the pitch K. In the configuration shown in FIG. 10B, the maximum radius R1 of the rotation locus of the stirring sheet portion 119 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20, as shown in FIG. can do.

これに対して、被支持部119aのピッチKに対して、切り欠き部119dの幅Lが1/2よりも大きい長さになると、図6(c)に示すように、現像剤Tから受ける抵抗Zにより第二撹拌部119cが第一撹拌部119bを支えることができなくなる。これにより撹拌シート部119の回転軌跡の最大半径R1を撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができなくなる。他の構成は前記各実施形態と同様に構成され、同様の効果を得ることが出来る。   On the other hand, when the width L of the cutout portion 119d is greater than ½ with respect to the pitch K of the supported portion 119a, it is received from the developer T as shown in FIG. The resistance Z prevents the second stirring unit 119c from supporting the first stirring unit 119b. As a result, the maximum radius R1 of the rotation locus of the stirring sheet portion 119 cannot be made larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20. Other configurations are the same as those in the above embodiments, and the same effects can be obtained.

次に、図11を用いて本発明に係る現像装置、現像剤収納ユニット及び画像形成装置の第4実施形態の構成について説明する。尚、前記各実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of the fourth embodiment of the developing device, developer storage unit, and image forming apparatus according to the present invention will be described with reference to FIG. In addition, what was comprised similarly to each said embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

前記各実施形態では、図4に示すように、支持部20cをフック形状とした。しかし、撹拌軸部20が回転方向となる図4(c)の矢印D方向に回転したときに撹拌シート部19が撹拌軸部20から外れない構成であれば良い。   In each of the above embodiments, as shown in FIG. 4, the support portion 20c has a hook shape. However, any configuration may be used as long as the stirring sheet portion 19 does not come off the stirring shaft portion 20 when the stirring shaft portion 20 rotates in the direction of arrow D in FIG.

本実施形態では、図11(a),(b)に示すように、撹拌軸部220の平面部220eに円柱状のボスからなる支持部220cを設ける。そして、該支持部220cを撹拌シート部119の貫通穴からなる被支持部219aに挿通する。その後、該支持部220cの先端部をカシメ加工等により被支持部219aよりも大きな外形となるように拡径しても良い。   In this embodiment, as shown in FIGS. 11A and 11B, a support portion 220c made of a cylindrical boss is provided on the flat portion 220e of the stirring shaft portion 220. Then, the support portion 220c is inserted into a supported portion 219a formed of a through hole of the stirring sheet portion 119. Thereafter, the diameter of the tip of the support portion 220c may be increased by caulking or the like so as to have a larger outer shape than the supported portion 219a.

図11(a)は本実施形態の撹拌シート部219を撹拌軸部220へ取り付ける組立方法を説明する分解斜視図である。図11(b)は組み立て後の撹拌部材221の構成を示す斜視説明図である。   FIG. 11A is an exploded perspective view for explaining an assembly method for attaching the stirring sheet portion 219 of the present embodiment to the stirring shaft portion 220. FIG. 11B is a perspective explanatory view showing the structure of the stirring member 221 after assembly.

図11(a)に示すように、本実施形態の撹拌軸部220の平面部220eには、回転駆動力が伝達される撹拌軸部220の回転軸方向(図11の左右方向)に沿って所定ピッチで複数のボス形状の支持部220cが突設されている。本実施形態では、支持部220cの直径H1は撹拌シート部219の複数の貫通丸穴からなる被支持部219aの直径H2よりも小さい。   As shown in FIG. 11 (a), the planar portion 220e of the stirring shaft portion 220 of the present embodiment is along the rotational axis direction (the left-right direction in FIG. 11) of the stirring shaft portion 220 to which the rotational driving force is transmitted. A plurality of boss-shaped support portions 220c are projected at a predetermined pitch. In the present embodiment, the diameter H1 of the support portion 220c is smaller than the diameter H2 of the supported portion 219a formed of a plurality of through-round holes in the stirring sheet portion 219.

そして、撹拌軸部220の支持部220cを可撓性を有する撹拌シート部219の被支持部219a内に挿通する。そして、図11(b)に示すように、撹拌軸部220の支持部220cの先端部を超音波カシメ、熱カシメ、冷間カシメ等の方法で拡張して変形させて撹拌シート部219の被支持部219aの直径H2よりも大きくなるようにする。つまり、撹拌軸部220の支持部220cの先端部を変形させた後の直径を直径H3とすると以下の数6式に示す関係となる。   Then, the support part 220c of the stirring shaft part 220 is inserted into the supported part 219a of the stirring sheet part 219 having flexibility. Then, as shown in FIG. 11B, the tip of the support portion 220c of the stirring shaft portion 220 is expanded and deformed by a method such as ultrasonic caulking, thermal caulking, cold caulking, etc. It is made larger than the diameter H2 of the support part 219a. That is, when the diameter of the support shaft 220c of the stirring shaft 220 after the tip is deformed is the diameter H3, the relationship shown in the following formula 6 is established.

[数6]
H3>H2>H1
[Equation 6]
H3>H2> H1

このように撹拌軸部220の支持部220cを撹拌シート部219の被支持部219a内に挿通した後、該支持部220cの先端部を拡張して変形させることで、撹拌シート部219を撹拌軸部220に固定することができる。尚、図11(a),(b)において、219bは第一撹拌部、219cは第二撹拌部、219dは切り欠き部、220dは略円筒部である。   Thus, after inserting the support part 220c of the stirring shaft part 220 into the supported part 219a of the stirring sheet part 219, the front end part of the support part 220c is expanded and deformed, so that the stirring sheet part 219 is moved to the stirring shaft part 219. It can be fixed to the part 220. In FIGS. 11A and 11B, 219b is a first stirring portion, 219c is a second stirring portion, 219d is a notch portion, and 220d is a substantially cylindrical portion.

図4に示す第1実施形態のように、支持部20cがフック形状の場合、撹拌軸部20の支持部20cに撹拌シート部19の被支持部19aを挿通して引っ掛けるだけで撹拌シート部19を撹拌軸部20に係止して組み付けるだけで撹拌部材21が形成される。このため組立工数が少ない。   As in the first embodiment shown in FIG. 4, when the support portion 20 c has a hook shape, the stirring sheet portion 19 is simply inserted through the supported portion 19 a of the stirring sheet portion 19 and hooked to the support portion 20 c of the stirring shaft portion 20. The stirring member 21 is formed simply by locking and assembling to the stirring shaft portion 20. For this reason, there are few assembly steps.

一方、図11に示す本実施形態のように、支持部220cがボス形状の場合、撹拌軸部220の支持部220cに撹拌シート部219の被支持部219aを挿通した後に支持部220cの先端部を変形させる工程が必要となるため組立工数は多い。しかしながら撹拌シート部219を撹拌軸部220に確実に固定することができる。また、撹拌シート部219の被支持部219aが弾性変形して拡径出来ない材質であっても適用可能である。これらの構成は、必要な機能に応じて適宜選択すれば良い。他の構成は前記各実施形態と同様に構成され、同様の効果を得ることが出来る。   On the other hand, when the support portion 220c has a boss shape as in the present embodiment shown in FIG. 11, after the supported portion 219a of the stirring sheet portion 219 is inserted into the support portion 220c of the stirring shaft portion 220, the tip portion of the support portion 220c is inserted. Since a process for deforming the structure is required, the number of assembly steps is large. However, the stirring sheet portion 219 can be reliably fixed to the stirring shaft portion 220. Further, even if the supported portion 219a of the stirring sheet portion 219 is made of a material that cannot be expanded due to elastic deformation, it can be applied. These configurations may be appropriately selected according to the necessary functions. Other configurations are the same as those in the above embodiments, and the same effects can be obtained.

尚、本実施形態では、プロセスカートリッジ4の一部を構成する現像装置38に現像剤収納ユニットを適用した一例について説明した。他に、現像剤Tを収納する現像枠体40と、現像剤Tを撹拌するために現像枠体40に対して回転可能な前記各実施形態の撹拌部材21,221とを備える図示しない現像剤収納ユニットに適用した場合にも同様の効果を得ることが出来る。   In the present embodiment, an example in which the developer storage unit is applied to the developing device 38 constituting a part of the process cartridge 4 has been described. In addition, a developer (not shown) provided with a developing device frame 40 that stores the developer T, and the agitating members 21 and 221 of the above-described embodiments that are rotatable with respect to the developing device frame 40 to agitate the developer T Similar effects can be obtained when applied to a storage unit.

次に、図12〜図16を用いて本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジを装着可能に構成した画像形成装置の第5実施形態の構成について説明する。尚、前記各実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of a fifth embodiment of an image forming apparatus configured to be able to mount a process cartridge including a developing device having a developer storage unit according to the present invention will be described with reference to FIGS. In addition, what was comprised similarly to each said embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

<撹拌手段>
先ず図12〜図16を用いて本実施形態の撹拌部材21の構成について説明する。図12は本実施形態の現像剤収納ユニットを有する現像装置38を備えたプロセスカートリッジ4の構成を示す断面説明図である。図13(a)は撹拌軸部20へ撹拌シート部19を取り付ける組み立て方法を説明する分解斜視図である。図13(b)は撹拌部材21の断面説明図である。
<Agitating means>
First, the configuration of the stirring member 21 of the present embodiment will be described with reference to FIGS. FIG. 12 is a cross-sectional explanatory view showing the configuration of the process cartridge 4 provided with the developing device 38 having the developer storage unit of the present embodiment. FIG. 13A is an exploded perspective view for explaining an assembly method for attaching the stirring sheet portion 19 to the stirring shaft portion 20. FIG. 13B is a cross-sectional explanatory view of the stirring member 21.

図12に示すように、本実施形態の現像剤容器は剛性を有する枠体としての現像容器61と底部材62とを有して構成される。現像容器61には開口63が設けられている。現像剤容器内に収納された現像剤Tを撹拌する回転可能な撹拌手段となる撹拌部材21は撹拌軸部20と、可撓性を有する撹拌シート部19とを有して構成される。撹拌シート部19の固定部19eが接着または両面テープ等の固定部材22により撹拌軸部20の平面部20eに貼着して固定される。   As shown in FIG. 12, the developer container of this embodiment includes a developing container 61 and a bottom member 62 as a rigid frame. The developing container 61 is provided with an opening 63. An agitating member 21 serving as a rotatable agitating means for agitating the developer T accommodated in the developer container includes an agitating shaft portion 20 and a flexible agitating sheet portion 19. The fixing part 19e of the stirring sheet part 19 is adhered and fixed to the flat part 20e of the stirring shaft part 20 by a fixing member 22 such as adhesive or double-sided tape.

図13(a)に示すように、本実施形態の撹拌軸部20は図2に示す現像枠体40に対して回転可能に支持される被支持部20aと、撹拌シート部19を支持する平面部20eとを備える。また、被支持部20aの長手方向外側には図示しない駆動伝達ギアが取り付けられている。画像形成装置2の駆動部から前記駆動伝達ギアに回転駆動力が伝達され、撹拌軸部20を回転方向となる図14(a)の矢印D方向に回転させる。   As shown in FIG. 13 (a), the stirring shaft portion 20 of the present embodiment is supported by a supported portion 20a that is rotatably supported with respect to the developing device frame 40 shown in FIG. Part 20e. A drive transmission gear (not shown) is attached to the outside of the supported portion 20a in the longitudinal direction. A rotational driving force is transmitted from the drive unit of the image forming apparatus 2 to the drive transmission gear, and the agitation shaft unit 20 is rotated in the direction of arrow D in FIG.

撹拌シート部19は、図13(b)に示すように、撹拌軸部20の平面部20eに固定部材22を貼り付けて固定される。本実施形態において使用される固定部材22は両面テープである。撹拌シート部19の固定部19eが撹拌軸部20の平面部20eに接着または両面テープにより貼着される。   As shown in FIG. 13 (b), the stirring sheet portion 19 is fixed by attaching a fixing member 22 to the flat portion 20 e of the stirring shaft portion 20. The fixing member 22 used in this embodiment is a double-sided tape. The fixing portion 19e of the stirring sheet portion 19 is adhered to the flat portion 20e of the stirring shaft portion 20 by adhesion or double-sided tape.

撹拌シート部19の第一撹拌部19bは撹拌シート部19の固定部19eに対して撹拌軸部20の回転方向の上流側に突き出される。第一撹拌部19bは現像容器61に設けられた開口63を封止する封止部材を兼ねている。第一撹拌部19bの先端部は現像容器61に設けられた開口63の周囲に設けられた封止部64a,64bに剥離可能に熱溶着されている。そして、撹拌軸部20が図12の矢印D方向に回転することで第一撹拌部19bが撹拌軸部20の外周面に巻き取られて封止部64a,64bが剥離して開口63から現像剤Tが排出される。   The first stirring portion 19b of the stirring sheet portion 19 protrudes upstream in the rotational direction of the stirring shaft portion 20 with respect to the fixed portion 19e of the stirring sheet portion 19. The first stirring unit 19b also serves as a sealing member that seals the opening 63 provided in the developing container 61. The tip of the first stirring portion 19b is thermally welded to the sealing portions 64a and 64b provided around the opening 63 provided in the developing container 61 so as to be peelable. Then, when the stirring shaft portion 20 rotates in the direction of arrow D in FIG. 12, the first stirring portion 19b is wound around the outer peripheral surface of the stirring shaft portion 20, and the sealing portions 64a and 64b are peeled off and developed from the opening 63. The agent T is discharged.

また、撹拌シート部19の第二撹拌部19cは撹拌シート部19の固定部19eに対して第一撹拌部19bと反対側に突き出される。尚、両面テープの他に撹拌シート部19の固定部19eを撹拌軸部20の平面部20eに接着材等を使用し固定しても良い。撹拌シート部19の第一撹拌部19bと第二撹拌部19cとは一体的に構成される。   Further, the second stirring portion 19c of the stirring sheet portion 19 protrudes on the opposite side of the first stirring portion 19b with respect to the fixing portion 19e of the stirring sheet portion 19. In addition to the double-sided tape, the fixing portion 19e of the stirring sheet portion 19 may be fixed to the flat portion 20e of the stirring shaft portion 20 using an adhesive or the like. The first stirring portion 19b and the second stirring portion 19c of the stirring sheet portion 19 are integrally configured.

図13(b)に示すように、撹拌部材21の回転駆動時において固定部材22により固定された撹拌シート部19の第一撹拌部19bと、第二撹拌部19cとは、以下の点をそれぞれ支点として撹拌動作を行う。第一撹拌部19b側の固定端部Bと、第二撹拌部19c側の固定端部Jとをそれぞれ支点として撹拌動作を行う。   As shown in FIG. 13 (b), the first stirring portion 19b and the second stirring portion 19c of the stirring sheet portion 19 fixed by the fixing member 22 during the rotational driving of the stirring member 21 have the following points, respectively. Stirring is performed as a fulcrum. The stirring operation is performed with the fixed end B on the first stirring unit 19b side and the fixed end J on the second stirring unit 19c side as fulcrums, respectively.

<撹拌手段の回転時の挙動>
次に図13〜図16及び図8を用いて本実施形態の撹拌部材21の回転時の挙動について説明する。図13〜図16は撹拌部材21の回転中の挙動を説明する断面説明図である。撹拌軸部20は平面部20eを備える断面D字形状(略円筒形状)で構成される。図14(a)は撹拌部材21が回転する前の状態を示す断面説明図である。図14(b)は撹拌部材21が回転し始めた直後の状態を示す断面説明図である。図14(c)は撹拌部材21が回転している状態を示す断面説明図である。図15(a)は比較例4の撹拌部材21が回転している状態を示す断面説明図である。図15(b)は比較例5の撹拌部材21が回転している状態を示す断面説明図である。
<Behavior during rotation of stirring means>
Next, the behavior at the time of rotation of the stirring member 21 of this embodiment is demonstrated using FIGS. 13-16 and FIG. 13 to 16 are cross-sectional explanatory views for explaining the behavior of the stirring member 21 during rotation. The stirring shaft portion 20 is configured in a D-shaped cross section (substantially cylindrical shape) having a flat portion 20e. FIG. 14A is a cross-sectional explanatory view showing a state before the stirring member 21 rotates. FIG. 14B is an explanatory cross-sectional view showing a state immediately after the stirring member 21 starts to rotate. FIG. 14C is a cross-sectional explanatory view showing a state in which the stirring member 21 is rotating. FIG. 15A is an explanatory cross-sectional view showing a state in which the stirring member 21 of Comparative Example 4 is rotating. FIG. 15B is a cross-sectional explanatory view showing a state in which the stirring member 21 of Comparative Example 5 is rotating.

図14(a)に示すように、撹拌シート部19の第一撹拌部19bは図13(b)に示す撹拌シート部19の固定部に設けられる固定部材22に対して以下の通り構成される。撹拌軸部20の回転方向となる図14(a)の矢印D方向上流側にある固定端部Bから第一撹拌部19bの回転方向の長さXだけ突出している。   As shown in FIG. 14 (a), the first stirring portion 19b of the stirring sheet portion 19 is configured as follows with respect to the fixing member 22 provided in the fixing portion of the stirring sheet portion 19 shown in FIG. 13 (b). . It protrudes from the fixed end B on the upstream side in the direction of arrow D in FIG. 14A, which is the rotation direction of the stirring shaft portion 20, by a length X in the rotation direction of the first stirring portion 19b.

また、撹拌シート部19の第二撹拌部19cは撹拌軸部20の支持部となる固定部材22に対して撹拌軸部20の回転方向となる図14(a)の矢印D方向下流側にある固定端部Jから第二撹拌部19cの回転方向の長さYだけ突出している。本実施形態における前記長さXは撹拌軸部20の周長よりも長い30mm以上であり、前記長さYは1mm〜10mm程度である。   Further, the second stirring portion 19c of the stirring sheet portion 19 is on the downstream side in the direction of arrow D in FIG. 14 (a), which is the rotational direction of the stirring shaft portion 20, with respect to the fixing member 22 that is the support portion of the stirring shaft portion 20. A length Y in the rotational direction of the second stirring portion 19c protrudes from the fixed end portion J. The length X in the present embodiment is 30 mm or longer, which is longer than the circumferential length of the stirring shaft portion 20, and the length Y is about 1 mm to 10 mm.

次に、図14(b)に示すように、撹拌部材21が図14(b)の矢印D方向に回転し始めると第二撹拌部19cは現像剤Tから抵抗Zを受ける。これにより固定部材22の固定端部Jを支点として撹拌部材21の回転方向となる図14(b)の矢印D方向上流側に撓む。同様に第一撹拌部19bも現像剤Tから受ける抵抗Zにより固定部材22の固定端部Bを支点として撹拌部材21の回転方向となる図14(b)の矢印D方向上流側に撓む。   Next, as shown in FIG. 14B, when the stirring member 21 starts to rotate in the direction of arrow D in FIG. 14B, the second stirring portion 19c receives resistance Z from the developer T. As a result, the fixed end portion J of the fixed member 22 is bent toward the upstream side in the direction of arrow D in FIG. Similarly, the first stirring portion 19b is also deflected upstream by the resistance Z received from the developer T in the direction of arrow D in FIG. 14B, which is the rotational direction of the stirring member 21, with the fixed end B of the fixing member 22 as a fulcrum.

現像容器61と底部材62とからなる現像剤容器内に収容されている現像剤Tの量が多く、現像剤Tから受ける負荷が大きい場合がある。その場合には、図14(c)に示すように、撹拌部材21が更に図14(c)の矢印D方向に回転すると、第一撹拌部19bが現像剤Tから受ける抵抗Zにより撹拌部材21の回転方向となる図14(c)の矢印D方向上流側に撓み続ける。そして、第一撹拌部19bが撹拌軸部20の略円筒部20dに近接するように円弧形状になる。更に、第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図14(c)の矢印D方向上流側に位置するようになる。   There is a case where the amount of the developer T accommodated in the developer container composed of the developer container 61 and the bottom member 62 is large and the load received from the developer T is large. In this case, as shown in FIG. 14 (c), when the stirring member 21 further rotates in the direction of arrow D in FIG. 14 (c), the stirring member 21 is caused by the resistance Z received by the first stirring portion 19b from the developer T. Continue to bend in the direction of arrow D in FIG. The first stirring portion 19b has an arc shape so as to be close to the substantially cylindrical portion 20d of the stirring shaft portion 20. Furthermore, the tip Q of the first stirring portion 19b is positioned upstream of the tip U of the second stirring portion 19c in the direction of arrow D in FIG.

このとき、撹拌シート部19の第一撹拌部19bと撹拌軸部20との間には撹拌部材21の回転方向となる図14(c)の矢印D方向上流側に撓められた第二撹拌部19cが存在する。そのため撹拌軸部20の回転中心Pからの撹拌シート部19の回転軌跡の最大半径R1は、撹拌軸部20の略円筒部20dに近接する撹拌シート部19の回転軌跡の最小半径(撹拌軸部20の回転軌跡の最大半径)R2よりも大きくなる。つまり、前記数2式で示される関係となる。   At this time, the second stirring deflected upstream in the direction of arrow D in FIG. 14C, which is the rotational direction of the stirring member 21, between the first stirring portion 19b of the stirring sheet portion 19 and the stirring shaft portion 20. Part 19c is present. Therefore, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 from the rotation center P of the stirring shaft portion 20 is the minimum radius of the rotation locus of the stirring sheet portion 19 close to the substantially cylindrical portion 20d of the stirring shaft portion 20 (the stirring shaft portion). The maximum radius of 20 rotation trajectories) R2. That is, the relationship represented by the above equation 2 is established.

比較例4として図15(a)に示すように、撹拌シート部19に第二撹拌部19cを設けずに薄く剛性の低い撹拌シート部19を用いた。その場合、現像剤Tから受ける抵抗Zにより前記最大半径R1と最小半径R2とは略同等になる。これに対して、図14(c)に示す本実施形態では、撹拌シート部19に第二撹拌部19cを設けることで撹拌シート部19の回転軌跡の最大半径R1を撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができる。   As Comparative Example 4, as shown in FIG. 15A, the stirring sheet portion 19 is not provided with the second stirring portion 19c, and the stirring sheet portion 19 which is thin and has low rigidity is used. In this case, the maximum radius R1 and the minimum radius R2 are substantially equal due to the resistance Z received from the developer T. On the other hand, in the present embodiment shown in FIG. 14 (c), by providing the stirring sheet portion 19 with the second stirring portion 19 c, the maximum radius R 1 of the rotation locus of the stirring sheet portion 19 is set to the rotation locus of the stirring shaft portion 20. Can be made larger than the maximum radius R2.

また、第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図14(c)の矢印D方向上流側に位置する。このため第二撹拌部19cの周辺を滑らかに第一撹拌部19bで覆うことができる。このとき、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲は図14(c)に示す撹拌軸部20の回転中心Pを中心とした角度θ1である。   Further, the tip Q of the first stirring portion 19b is located upstream of the tip U of the second stirring portion 19c in the direction of arrow D in FIG. For this reason, the periphery of the 2nd stirring part 19c can be smoothly covered with the 1st stirring part 19b. At this time, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 is centered on the rotation center P of the stirring shaft portion 20 shown in FIG. Angle θ1.

これに対して比較例5として図15(b)に示すように、第一撹拌部19bの先端部Qが第二撹拌部19cの先端部Uよりも撹拌部材21の回転方向となる図15(b)の矢印D方向下流側に位置する。その場合、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲は図15(b)に示すように、撹拌軸部20の回転中心Pを中心とした角度θ2である。つまり、前記数3式に示された関係となる。   On the other hand, as shown in FIG. 15B as Comparative Example 5, the tip Q of the first stirring portion 19b is in the rotational direction of the stirring member 21 more than the tip U of the second stirring portion 19c. It is located downstream in the direction of arrow D in b). In this case, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 is the rotation center P of the stirring shaft portion 20 as shown in FIG. The angle θ2 with respect to the center. That is, the relationship shown in Equation 3 is obtained.

従って、本実施形態では、図14(c)に示すように、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲を広くすることができる。撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲を広くすることで、撹拌軸部20が一回転する間に撹拌できる現像剤Tの量を多くすることができる。   Therefore, in the present embodiment, as shown in FIG. 14C, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 can be widened. it can. By widening the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20, the developer T that can be stirred while the stirring shaft portion 20 makes one rotation. The amount can be increased.

一方、現像容器61と底部材62とからなる現像剤容器内に収容されている現像剤Tの量が少なく、現像剤Tによる負荷が小さい場合がある。その場合には、撹拌部材21が回転しても第一撹拌部19bが撹拌軸部20に円弧状に巻き付くことがなく、図14(b)に示すような状態で、第一撹拌部19bは回転し続ける。この際、現像剤Tは第一撹拌部19bのみならず第二撹拌部19cによっても撹拌される。   On the other hand, the amount of the developer T accommodated in the developer container composed of the developer container 61 and the bottom member 62 is small, and the load due to the developer T may be small. In that case, even if the stirring member 21 rotates, the first stirring portion 19b does not wrap around the stirring shaft portion 20 in an arc shape, and in the state shown in FIG. 14 (b), the first stirring portion 19b Keeps spinning. At this time, the developer T is stirred not only by the first stirring portion 19b but also by the second stirring portion 19c.

この際、第二撹拌部19cは第一撹拌部19bと反対側に突き出るように設けられている。このため図16(a)に示すように、第二撹拌部19cの回転中心Pと先端部Uとを結んだ直線aに対して第二撹拌部19cの撓みの支点となる固定部材22の固定端部Jは回転方向となる図16(a)の矢印D方向下流側にくる。   At this time, the second stirring portion 19c is provided so as to protrude to the opposite side to the first stirring portion 19b. For this reason, as shown in FIG. 16A, the fixing member 22 is fixed as a fulcrum of bending of the second stirring portion 19c with respect to the straight line a connecting the rotation center P and the tip portion U of the second stirring portion 19c. The end J comes to the downstream side in the direction of arrow D in FIG.

一方、特許文献2のように図16(b)に示す比較例6では、複数の撹拌部51,52が撹拌軸部53の互いに平行に対向する平面部53a,53bに固定部材22により固定されている。そして、撹拌軸部53の回転中心Pと、撹拌部51の先端部Uを結んだ直線aに対して該撹拌部51の撓みの支点となる固定部材22の固定端部Jが回転方向となる図16(b)の矢印D方向上流側に設けられている。   On the other hand, in Comparative Example 6 shown in FIG. 16B as in Patent Document 2, the plurality of stirring portions 51 and 52 are fixed to the flat portions 53a and 53b of the stirring shaft portion 53 facing each other by the fixing member 22. ing. Then, the fixed end J of the fixing member 22 that serves as a fulcrum for the bending of the stirring unit 51 with respect to the straight line a connecting the rotation center P of the stirring shaft 53 and the tip U of the stirring unit 51 is the rotational direction. It is provided on the upstream side in the direction of arrow D in FIG.

現像容器61と底部材62とからなる現像剤容器内に収容されている現像剤Tの撹拌搬送方向が重力方向Gに対して垂直方向に最大となるのは、図16(a),(b)に示すように第二撹拌部19c及び撹拌部51が重力方向Gと平行となっている場合である。   16 (a) and 16 (b), the stirring and transporting direction of the developer T accommodated in the developer container composed of the developing container 61 and the bottom member 62 is maximized in the direction perpendicular to the gravity direction G. ), The second stirring unit 19c and the stirring unit 51 are parallel to the gravity direction G.

図14(a)に示す本実施形態と、図16(b)に示す比較例6との構成を比較すると、本実施形態の方がより回転方向となる図16(a)の矢印D方向上流側で重力方向Gに対して垂直方向の撹拌力が最大となっていることが分かる。   Comparing the configuration of the present embodiment shown in FIG. 14 (a) with the comparative example 6 shown in FIG. 16 (b), this embodiment is more in the direction of rotation in the direction of arrow D in FIG. 16 (a). It can be seen that the stirring force in the direction perpendicular to the gravity direction G is maximum on the side.

撹拌部材21の回転中心Pは、図2に示す現像剤供給ローラ23の重力方向Gと反対側の上方投影領域Vに配置されている。このため図14(a)に示す本実施形態のように、図16(b)に示す比較例6よりも回転方向となる図16(a)の矢印D方向上流側で重力方向Gに対して垂直方向の撹拌力が最大となっている。これにより現像剤供給ローラ23に近傍の現像剤Tを効果的に撹拌することが可能となる。   The rotation center P of the stirring member 21 is disposed in the upper projection region V on the opposite side of the developer supply roller 23 shown in FIG. For this reason, as in the present embodiment shown in FIG. 14A, the direction of rotation relative to the direction of gravity G on the upstream side in the direction of arrow D in FIG. The vertical stirring force is maximum. As a result, the developer T in the vicinity of the developer supply roller 23 can be effectively stirred.

この構成により、薄い撹拌シート部19を用いた場合でも該撹拌シート部19の回転軌跡の最大半径R1を撹拌軸部20の回転軌跡の最大半径R2よりも大きくすることができる。また、撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きくなる範囲を広くすることができる。従って、現像剤Tから受ける抵抗Zに負けずに良好な現像剤Tの撹拌循環を実現し、濃度ムラのない現像装置38を提供することができる。   With this configuration, even when the thin stirring sheet portion 19 is used, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 can be made larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20. Further, the range in which the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is larger than the maximum radius R2 of the rotation locus of the stirring shaft portion 20 can be widened. Therefore, it is possible to provide a developing device 38 that achieves satisfactory stirring and circulation of the developer T without losing the resistance Z received from the developer T and has no density unevenness.

また、現像容器61と底部材62とからなる現像剤容器の内壁面と撹拌軸部20との離間距離が小さい場合がある。そのとき、現像容器61と底部材62とからなる現像剤容器の壁面が撹拌シート部19の回転軌跡の最大半径R1と撹拌軸部20の回転軌跡の最大半径R2との間に位置する場合がある。その場合でも第二撹拌部19cが可撓性を有するため現像容器61と底部材62とからなる現像剤容器の壁面に沿って現像剤Tを撹拌することができる。   In some cases, the distance between the inner wall surface of the developer container composed of the developing container 61 and the bottom member 62 and the stirring shaft portion 20 is small. At this time, the wall surface of the developer container composed of the developing container 61 and the bottom member 62 may be located between the maximum radius R1 of the rotation locus of the stirring sheet portion 19 and the maximum radius R2 of the rotation locus of the stirring shaft portion 20. is there. Even in this case, since the second stirring portion 19c has flexibility, the developer T can be stirred along the wall surface of the developer container including the developing container 61 and the bottom member 62.

尚、本実施形態では第二撹拌部19cが可撓性を有するシート部材で構成される一例について説明した。他に第二撹拌部19cが撹拌軸部20と一体的に剛性を有する板状に形成され、可撓性を有さない場合には、撹拌シート部19の回転軌跡の最大半径R1をより大きくすることができる。   In the present embodiment, an example in which the second stirring portion 19c is formed of a flexible sheet member has been described. In addition, when the second stirring portion 19c is formed in a plate shape having rigidity integrally with the stirring shaft portion 20 and does not have flexibility, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is increased. can do.

しかし、現像剤Tから受ける抵抗Zが大きくなり過ぎる。そのため、第二撹拌部19cに大きな力が加わり撹拌軸部20が破損する可能性がある。また、撹拌軸部20を回転させるトルクが大きくなり、画像形成装置2から撹拌軸部20への駆動伝達を行う部品が破損する可能性がある。また、現像容器61と底部材62とからなる現像剤容器の内壁面と撹拌軸部20との離間距離を撹拌シート部19の回転軌跡の最大半径R1よりも大きくする必要がある。このため現像容器61と底部材62とからなる現像剤容器に対する撹拌軸部20の配置の自由度が制約を受ける。   However, the resistance Z received from the developer T becomes too large. Therefore, a large force is applied to the second stirring portion 19c, and the stirring shaft portion 20 may be damaged. Further, the torque for rotating the stirring shaft portion 20 increases, and there is a possibility that a component that performs drive transmission from the image forming apparatus 2 to the stirring shaft portion 20 may be damaged. Further, the separation distance between the inner wall surface of the developer container composed of the developing container 61 and the bottom member 62 and the stirring shaft portion 20 needs to be larger than the maximum radius R1 of the rotation locus of the stirring sheet portion 19. For this reason, the freedom degree of arrangement | positioning of the stirring shaft part 20 with respect to the developer container which consists of the developing container 61 and the bottom member 62 receives restrictions.

本実施形態では、薄く剛性の低い撹拌シート部19を用いることが出来る。その場合でも現像容器61と底部材62とからなる現像剤容器内の現像剤Tの量が多い場合では撹拌シート部19の回転軌跡の最大半径R1が撹拌軸部20の回転軌跡の最大半径R2よりも大きい範囲を広くすることができる。また、現像容器61と底部材62とからなる現像剤容器内の現像剤Tの量が少ない場合では第一撹拌部19bに加えて第二撹拌部19cも単体で現像剤Tの撹拌を行うことができる。   In the present embodiment, the stirring sheet portion 19 that is thin and has low rigidity can be used. Even in such a case, when the amount of the developer T in the developer container composed of the developer container 61 and the bottom member 62 is large, the maximum radius R1 of the rotation locus of the stirring sheet portion 19 is the maximum radius R2 of the rotation locus of the stirring shaft portion 20. The larger range can be made wider. Further, when the amount of the developer T in the developer container composed of the developer container 61 and the bottom member 62 is small, the developer T is stirred by the second stirring part 19c in addition to the first stirring part 19b. Can do.

そのため、撹拌軸部20が一回転する間に撹拌できる現像剤Tの量を多くすることができ、現像剤Tから受ける抵抗Zに負けずに良好な現像剤Tの撹拌循環を実現した濃度ムラのない良好な画像を出力することができる現像装置38を提供することができる。   Therefore, the amount of the developer T that can be stirred while the stirring shaft portion 20 makes one rotation can be increased, and the density unevenness that realizes good stirring circulation of the developer T without losing the resistance Z received from the developer T. Thus, it is possible to provide the developing device 38 that can output a good image without any problem.

また、撹拌シート部19の被支持部19aに対する撹拌軸部20の回転方向となる図14(a)の矢印D方向下流側には可撓性の第二撹拌部19cが設けられている。現像容器61と底部材62とからなる現像剤容器内の現像剤Tの量が多い場合がある。その場合には撹拌部材21の回転負荷が大きい。その場合には図14(c)に示すように、可撓性を有する第二撹拌部19cの腰の強さにより第一撹拌部19bをバックアップして第一撹拌部19bによる現像剤Tの撹拌循環を良好に保つ。   Further, a flexible second stirring portion 19c is provided on the downstream side in the direction of arrow D in FIG. 14A, which is the rotation direction of the stirring shaft portion 20 with respect to the supported portion 19a of the stirring sheet portion 19. In some cases, the amount of the developer T in the developer container composed of the developer container 61 and the bottom member 62 is large. In that case, the rotational load of the stirring member 21 is large. In that case, as shown in FIG. 14C, the first stirring unit 19b is backed up by the stiffness of the flexible second stirring unit 19c, and the developer T is stirred by the first stirring unit 19b. Maintain good circulation.

また、現像容器61と底部材62とからなる現像剤容器内の現像剤Tの量が少ない場合がある。その場合には撹拌部材21の回転負荷が小さい。その場合には第一撹拌部19bに加えて第二撹拌部19cが単独で現像剤Tの撹拌循環を良好に保つことができる。他の構成は前記各実施形態と同様に構成され、同様の効果を得ることが出来る。   Further, the amount of the developer T in the developer container composed of the developer container 61 and the bottom member 62 may be small. In that case, the rotational load of the stirring member 21 is small. In that case, in addition to the first stirring section 19b, the second stirring section 19c alone can keep the stirring circulation of the developer T well. Other configurations are the same as those in the above embodiments, and the same effects can be obtained.

次に、図17を用いて本発明に係る現像剤収納ユニットを有する現像装置を備えたプロセスカートリッジを装着可能に構成した画像形成装置の第6実施形態の構成について説明する。尚、前記各実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of a sixth embodiment of an image forming apparatus configured to be able to be mounted with a process cartridge including a developing device having a developer storage unit according to the present invention will be described with reference to FIG. In addition, what was comprised similarly to each said embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

図17は本実施形態の現像剤収納ユニットを有する現像装置38を備えたプロセスカートリッジ4の構成を示す断面説明図である。前記第6実施形態では、剛性を有する枠体からなる現像容器61に設けられた開口63を封止する封止部材を撹拌シート部19の第一撹拌部19bが兼ねる構成とした。本実施形態では図17に示すように、現像枠体40の内部に現像剤Tを収納する現像剤容器となる可撓性の現像剤袋71が設けられる。現像剤袋71には所定の開口72が設けられている。   FIG. 17 is a cross-sectional explanatory view showing the configuration of the process cartridge 4 provided with the developing device 38 having the developer storage unit of the present embodiment. In the sixth embodiment, the first stirring portion 19b of the stirring sheet portion 19 also serves as a sealing member that seals the opening 63 provided in the developing container 61 formed of a rigid frame. In the present embodiment, as shown in FIG. 17, a flexible developer bag 71 serving as a developer container for storing the developer T is provided inside the developing device frame 40. A predetermined opening 72 is provided in the developer bag 71.

現像剤袋71内に収納された現像剤Tを撹拌する回転可能な撹拌手段となる撹拌部材21は断面方形状の撹拌軸部20と、可撓性を有する撹拌シート部19とを有して構成される。撹拌シート部19の固定部19eがビス等の固定部材22により撹拌軸部20の平面部20eに貼着して固定される。尚、撹拌シート部19の固定部19eを撹拌軸部20の平面部20eに固定する固定部材22は接着または両面テープ等を使用して固定しても良い。   A stirring member 21 serving as a rotatable stirring means for stirring the developer T stored in the developer bag 71 includes a stirring shaft portion 20 having a rectangular cross section and a stirring sheet portion 19 having flexibility. Composed. The fixing portion 19e of the stirring sheet portion 19 is fixed to the flat portion 20e of the stirring shaft portion 20 by a fixing member 22 such as a screw. The fixing member 22 that fixes the fixing portion 19e of the stirring sheet portion 19 to the flat portion 20e of the stirring shaft portion 20 may be fixed using adhesive or double-sided tape.

撹拌シート部19の第一撹拌部19bは撹拌シート部19の固定部19eに対して撹拌軸部20の回転方向(図17の矢印D方向)の上流側に突き出される。第一撹拌部19bは現像剤袋71に設けられた開口72を封止する封止部材を兼ねている。第一撹拌部19bの先端部は現像剤袋71に設けられた開口72の周囲に設けられた封止部73a,73bに剥離可能に熱溶着されている。そして、撹拌軸部20が図17の矢印D方向に回転することで第一撹拌部19bが撹拌軸部20の外周面に巻き取られて封止部73a,73bが剥離して開口72から現像剤Tが排出される。   The first stirring portion 19b of the stirring sheet portion 19 protrudes upstream of the fixing portion 19e of the stirring sheet portion 19 in the rotation direction of the stirring shaft portion 20 (the direction of arrow D in FIG. 17). The first stirring portion 19 b also serves as a sealing member that seals the opening 72 provided in the developer bag 71. The front end portion of the first stirring portion 19b is heat-welded to the sealing portions 73a and 73b provided around the opening 72 provided in the developer bag 71 so as to be peelable. Then, when the stirring shaft portion 20 rotates in the direction of arrow D in FIG. 17, the first stirring portion 19b is wound around the outer peripheral surface of the stirring shaft portion 20, and the sealing portions 73a and 73b are peeled off to develop from the opening 72. The agent T is discharged.

また、撹拌シート部19の第二撹拌部19cは撹拌シート部19の固定部19eに対して第一撹拌部19bと反対側に突き出される。撹拌シート部19の第一撹拌部19bと第二撹拌部19cとは一体的に構成される。他の構成は前記各実施形態と同様に構成され、同様の効果を得ることが出来る。   Further, the second stirring portion 19c of the stirring sheet portion 19 protrudes on the opposite side of the first stirring portion 19b with respect to the fixing portion 19e of the stirring sheet portion 19. The first stirring portion 19b and the second stirring portion 19c of the stirring sheet portion 19 are integrally configured. Other configurations are the same as those in the above embodiments, and the same effects can be obtained.

19 …撹拌シート部
19a …被支持部(貫通穴)
19b …第一撹拌部
19c …第二撹拌部
19d …切り欠き部
20 …撹拌軸部
20c …支持部
21 …撹拌部材(撹拌手段)
19… Stirring sheet
19a… Supported part (through hole)
19b ... 1st stirring part
19c ... 2nd stirring part
19d ... Notch
20… Stirring shaft
20c ... support part
21 ... Stirring member (stirring means)

Claims (16)

現像剤を収納する現像剤容器と、
現像剤を撹拌するための撹拌軸部と、可撓性を有する撹拌シート部とを有する撹拌手段と、
を有し、
前記撹拌軸部は、前記撹拌シート部を支持する複数の支持部を有し、
前記撹拌シート部は、前記支持部に支持される複数の被支持部と、前記被支持部に対して前記撹拌軸部の回転方向の上流側に突き出る第一撹拌部と、前記被支持部に対して前記第一撹拌部と反対側に突き出る第二撹拌部と、を有し、
前記第二撹拌部は、前記複数の被支持部間に設けられる切り欠き部を有することを特徴とする現像剤収納ユニット。
A developer container for storing the developer;
A stirring means having a stirring shaft portion for stirring the developer, and a stirring sheet portion having flexibility;
Have
The stirring shaft portion has a plurality of support portions that support the stirring sheet portion,
The stirring sheet portion includes a plurality of supported portions supported by the support portion, a first stirring portion protruding upstream in the rotation direction of the stirring shaft portion with respect to the supported portion, and the supported portion. And a second stirring part protruding to the opposite side to the first stirring part,
The developer storage unit, wherein the second stirring unit has a notch provided between the plurality of supported parts.
前記切り欠き部は前記複数の被支持部間の中央に設けられたことを特徴とする請求項1に記載の現像剤収納ユニット。   The developer storage unit according to claim 1, wherein the notch is provided at a center between the plurality of supported parts. 前記切り欠き部の前記撹拌軸部の回転軸方向の幅は、前記撹拌軸部の回転軸方向に沿って隣設される前記被支持部間の離間幅の1/2以下に設定されることを特徴とする請求項1または請求項2に記載の現像剤収納ユニット。   The width of the notch portion in the rotation axis direction of the stirring shaft portion is set to be ½ or less of the separation width between the supported portions adjacently provided along the rotation shaft direction of the stirring shaft portion. The developer storage unit according to claim 1, wherein: 前記第二撹拌部の先端部からの前記切り欠き部の深さは、前記第二撹拌部の先端部から前記被支持部までの離間距離よりも大きいことを特徴とする請求項1〜3のいずれか1項に記載の現像剤収納ユニット。   The depth of the said notch part from the front-end | tip part of a said 2nd stirring part is larger than the separation distance from the front-end | tip part of the said 2nd stirring part to the said to-be-supported part. The developer storage unit according to claim 1. 前記被支持部は貫通穴で構成され、
前記支持部は、前記貫通穴に挿通可能で前記撹拌軸部の回転方向の下流に向かって先端部が伸びるフック部で構成されたことを特徴とする請求項1〜4のいずれか1項に記載の現像剤収納ユニット。
The supported part is constituted by a through hole,
The said support part was comprised by the hook part which can be penetrated in the said through-hole, and was comprised in the hook part from which a front-end | tip part extends toward the downstream of the rotation direction of the said stirring shaft part. The developer storage unit described.
前記フック部は、前記撹拌軸部側の根元部よりも幅が広い引っ掛け部を有することを特徴とする請求項5に記載の現像剤収納ユニット。   The developer storage unit according to claim 5, wherein the hook portion has a hook portion that is wider than a base portion on the stirring shaft portion side. 前記フック部の先端部は先鋭部からなることを特徴とする請求項5または請求項6に記載の現像剤収納ユニット。   The developer storage unit according to claim 5 or 6, wherein a tip portion of the hook portion is a sharp portion. 前記被支持部は貫通穴で構成され、
前記支持部は、前記貫通穴に挿通した後、先端部が拡径されることを特徴とする請求項1〜7のいずれか1項に記載の現像剤収納ユニット。
The supported part is constituted by a through hole,
8. The developer storage unit according to claim 1, wherein a tip of the support portion is expanded after being inserted into the through hole. 9.
現像剤を収納する現像剤容器と、
現像剤を撹拌するための撹拌軸部と、可撓性を有する撹拌シート部とを有する撹拌手段と、
を有し、
前記撹拌シート部の固定部が前記撹拌軸部に固定され、
前記撹拌シート部は、前記固定部に対して前記撹拌軸部の回転方向の上流側に突き出され、前記現像剤容器の開口を封止する封止部材を兼ねる第一撹拌部と、前記固定部に対して前記第一撹拌部と反対側に突き出る第二撹拌部と、を有することを特徴とする現像剤収納ユニット。
A developer container for storing the developer;
A stirring means having a stirring shaft portion for stirring the developer, and a stirring sheet portion having flexibility;
Have
A fixed portion of the stirring sheet portion is fixed to the stirring shaft portion,
The stirring sheet portion protrudes upstream in the rotation direction of the stirring shaft portion with respect to the fixing portion, and a first stirring portion serving also as a sealing member that seals an opening of the developer container; and the fixing portion And a second agitation part protruding to the opposite side to the first agitation part.
前記撹拌シート部の固定部が前記撹拌軸部に接着または両面テープにより貼着されたことを特徴とする請求項9に記載の現像剤収納ユニット。   The developer storage unit according to claim 9, wherein a fixed portion of the stirring sheet portion is adhered to the stirring shaft portion by adhesion or a double-sided tape. 前記第二撹拌部の回転方向の長さは、前記第一撹拌部の回転方向の長さよりも短いことを特徴とする請求項1〜10のいずれか1項に記載の現像剤収納ユニット。   The developer storage unit according to claim 1, wherein a length of the second stirring unit in a rotation direction is shorter than a length of the first stirring unit in a rotation direction. 前記第一撹拌部と前記第二撹拌部とが一体的に構成されたことを特徴とする請求項1〜11のいずれか1項に記載の現像剤収納ユニット。   The developer storage unit according to any one of claims 1 to 11, wherein the first stirring unit and the second stirring unit are integrally configured. 請求項1〜12のいずれか1項に記載の現像剤収納ユニットと、
潜像を現像剤を用いて現像するための現像剤担持体と、
を有し、
前記撹拌手段により前記現像剤容器に収納された現像剤を撹拌し、前記現像剤担持体に現像剤を供給することを特徴とする現像装置。
The developer storage unit according to any one of claims 1 to 12,
A developer carrier for developing the latent image using a developer;
Have
A developing device, wherein the developer contained in the developer container is stirred by the stirring means, and the developer is supplied to the developer carrying member.
前記現像剤容器に収納された現像剤を前記現像剤担持体に供給する現像剤の供給回転体を有し、
前記撹拌軸部の回転中心が前記現像剤の供給回転体の重力方向と反対側の投影領域内に配置されたことを特徴とする請求項13に記載の現像装置。
A developer supply rotating body for supplying the developer stored in the developer container to the developer carrier;
The developing device according to claim 13, wherein a rotation center of the stirring shaft portion is disposed in a projection region opposite to a direction of gravity of the developer supply rotating body.
請求項13または請求項14に記載の現像装置と、
静電潜像を担持する像担持体と、
を有することを特徴とするプロセスカートリッジ。
The developing device according to claim 13 or 14,
An image carrier for carrying an electrostatic latent image;
A process cartridge comprising:
請求項1〜12のいずれか1項に記載の現像剤収納ユニット、請求項13または請求項14に記載の現像装置、請求項15に記載のプロセスカートリッジのいずれか1つを有することを特徴とする画像形成装置。   A developer storage unit according to claim 1, a developing device according to claim 13 or claim 14, and a process cartridge according to claim 15. Image forming apparatus.
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