JPH086437A - Photosensitive drum driving gear of electrophotographic device - Google Patents

Photosensitive drum driving gear of electrophotographic device

Info

Publication number
JPH086437A
JPH086437A JP6135264A JP13526494A JPH086437A JP H086437 A JPH086437 A JP H086437A JP 6135264 A JP6135264 A JP 6135264A JP 13526494 A JP13526494 A JP 13526494A JP H086437 A JPH086437 A JP H086437A
Authority
JP
Japan
Prior art keywords
gear
tooth surface
photosensitive drum
portions
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6135264A
Other languages
Japanese (ja)
Inventor
Masamichi Kimura
正道 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP6135264A priority Critical patent/JPH086437A/en
Publication of JPH086437A publication Critical patent/JPH086437A/en
Pending legal-status Critical Current

Links

Landscapes

  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Gears, Cams (AREA)

Abstract

PURPOSE:To enhance the accuracy of tips and the out-of-roundness of tooth surfaces and to assure sufficient rigidity. CONSTITUTION:This gear has net mesh-like ribs 1. These ribs 1 do not include a structure to directly connect the shaft part 2 of the gear and the tooth surface part 3. More specifically, the ribs 1 consist of two concentrical parts 4, 5 varying in diameter and many radial parts 6 around the shaft of the gear. The concentrical parts 4, 5 are arranged around the shaft part 2 between the shaft part 2 of the gear and the tooth surface part 3. The concentrical part 4 is connected to the shaft part 2 by the plural radial parts 6 and the concentrical part 5 is connected to the tooth surface part 3 by the plural radial parts 6. The concentrical parts 4, 5 are connected to each other by the plural radial parts 6. Shrinks, if generated at the time of molding of such gear, are dispersed in their directions like arrows A and, therefore, the accuracy of the tips and the out-of-roundness of the tooth surfaces is improved. Since the gear has the ribs, the rigidity of the tooth surface parts is assured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、電子写真技術を用いた
プリンタ、ファクシミリ装置、ならびに複写機などの電
子写真装置において感光体ドラムを駆動するためのギア
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear for driving a photosensitive drum in an electrophotographic apparatus such as a printer, a facsimile machine and a copying machine using electrophotographic technology.

【０００２】[0002]

【従来の技術】従来、電子写真技術を用いたプリンタ、
ファクシミリ装置、ならびに複写機などの電子写真装置
は感光体ドラムを備え、その感光体ドラム上に、電子写
真技術にもとづき、静電潜像を形成し、それをトナーに
よって現像して可視像としている。そして、この感光体
ドラムはモータによって駆動されるが、モータの回転は
図４，５に示すようなギアによって感光体ドラムに伝達
されている。すなわち、ギアの肉抜き部４１の、軸部４
２と歯面部４３との間に、複数の放射状のリブ４４が所
定の間隔で配置され、歯面部４３を支持している。な
お、図５は図４のｂ−ｂ線上の断面図である。このよう
なギア以外には、肉抜き部にリブがない構造のギアも用
いられている。2. Description of the Related Art Conventionally, a printer using electrophotographic technology,
An electrophotographic apparatus such as a facsimile machine and a copying machine is provided with a photoconductor drum, and an electrostatic latent image is formed on the photoconductor drum based on electrophotographic technology, and is developed with toner to form a visible image. There is. The photosensitive drum is driven by a motor, and the rotation of the motor is transmitted to the photosensitive drum by gears shown in FIGS. That is, the shaft portion 4 of the lightening portion 41 of the gear
A plurality of radial ribs 44 are arranged at predetermined intervals between the two and the tooth flank portion 43 to support the tooth flank portion 43. Note that FIG. 5 is a cross-sectional view taken along the line bb of FIG. In addition to such a gear, a gear having a structure in which the lightening portion has no rib is also used.

【０００３】[0003]

【発明が解決しようとする課題】しかし、図４に示した
ギアの場合、成形時に発生する、矢印Ｂ方向のヒケは、
歯先にまで影響を及ぼし、歯先の精度および歯面の真円
度を低下させる原因となっている。また、リブを持たな
い構造のギアでは、歯面部の剛性を十分に確保すること
が困難である。そのため、従来のギアでは、大きい負荷
である感光体ドラムをスムーズに駆動できず、回転速度
の変動が生じて、高品質の画像を得ることが難しいもの
となっている。However, in the case of the gear shown in FIG. 4, the sink mark in the direction of arrow B, which occurs during molding, is
It also affects the tip of the tooth, causing a decrease in the precision of the tip and the roundness of the tooth surface. Further, with a gear having a structure without ribs, it is difficult to sufficiently secure the rigidity of the tooth surface portion. Therefore, with the conventional gear, the photosensitive drum, which is a heavy load, cannot be driven smoothly, the rotation speed fluctuates, and it is difficult to obtain a high-quality image.

【０００４】本発明の目的は、このような問題を解決
し、歯先の精度および歯面の真円度が高く、かつ十分な
剛性を備えた電子写真装置の感光体ドラム駆動ギアを提
供することにある。An object of the present invention is to solve the above problems and provide a photoconductor drum drive gear for an electrophotographic apparatus, which has a high accuracy of the tooth tip and a high circularity of the tooth surface and has sufficient rigidity. Especially.

【０００５】[0005]

【課題を解決するための手段】本発明は、電子写真装置
を構成し、静電潜像を形成してそれをトナーによって現
像するための感光体ドラムを駆動するギアにおいて、網
の目状のリブを備え、そのリブは前記ギアの軸部と歯面
部とを直接接続する構造を含まないことを特徴とする。SUMMARY OF THE INVENTION The present invention constitutes an electrophotographic apparatus, and in a gear that drives a photosensitive drum for forming an electrostatic latent image and developing the electrostatic latent image with toner, a mesh-shaped gear is used. A rib is provided, and the rib does not include a structure for directly connecting the shaft portion and the tooth surface portion of the gear.

【０００６】[0006]

【作用】本発明の電子写真装置の感光体ドラム駆動ギア
は、網の目状のリブを備え、そのリブはギアの軸部と歯
面部とを直接接続する構造を含まない。従って、ギアを
成形する際、ヒケが発生しても、その方向が分散される
ので、歯先の精度および歯面の真円度が向上する。ま
た、リブを備えているので、歯面部の剛性も確保され
る。その結果、感光体ドラムの回転速度の変動が少なく
なり、高品質の画像を得ることができる。The photosensitive drum drive gear of the electrophotographic apparatus of the present invention is provided with a mesh-shaped rib, and the rib does not include a structure for directly connecting the shaft portion and the tooth surface portion of the gear. Therefore, even when a sink mark is generated when the gear is molded, the directions thereof are dispersed, so that the accuracy of the tooth tip and the roundness of the tooth surface are improved. Further, since the ribs are provided, the rigidity of the tooth surface portion is secured. As a result, fluctuations in the rotation speed of the photosensitive drum are reduced, and high quality images can be obtained.

【０００７】[0007]

【実施例】次に本発明の実施例について図面を参照して
説明する。Next, an embodiment of the present invention will be described with reference to the drawings.

【０００８】図１は本発明の電子写真装置の感光体ドラ
ム駆動ギアの一例を示す平面図、図２はそのａ−ａ断面
図である。このギアは網の目状のリブ１を備え、そして
リブ１はギアの軸部２と歯面部３とを直接接続する構造
を含んでいない。さらに詳しく説明すると、リブ１は、
２つの直径の異なる同心円部分４，５と、ギアの軸を中
心とする多数の放射状部分６とから成り、同心円部分
４，５はギアの軸部２と歯面部３との間に、軸部２を中
心にして配置され、同心円部分４は、複数の放射状部分
６によって軸部２と接続され、同心円部分５は、複数の
放射状部分６によって歯面部３と接続され、同心円部分
４，５どうしは、複数の放射状部分６によって接続され
ている。FIG. 1 is a plan view showing an example of a photosensitive drum drive gear of an electrophotographic apparatus of the present invention, and FIG. 2 is a sectional view taken along the line aa. This gear has a mesh-shaped rib 1, and the rib 1 does not include a structure for directly connecting the shaft portion 2 and the tooth surface portion 3 of the gear. More specifically, the rib 1 is
It is composed of two concentric circular portions 4 and 5 having different diameters and a large number of radial portions 6 centered on the shaft of the gear. The concentric circular portions 4 and 5 are provided between the shaft portion 2 and the tooth surface portion 3 of the gear, 2, the concentric portion 4 is connected to the shaft portion 2 by a plurality of radial portions 6, the concentric portion 5 is connected to the tooth surface portion 3 by a plurality of radial portions 6, and the concentric portion portions 4 and 5 are connected to each other. Are connected by a plurality of radial portions 6.

【０００９】このようなギアでは、その成形の際、ヒケ
が発生しても、その方向が矢印Ａのように分散されるの
で、歯先の精度および歯面の真円度が向上する。また、
リブを備えているので、歯面部の剛性も確保される。In such a gear, even if a sink mark is generated during the molding, the directions thereof are dispersed as shown by the arrow A, so that the accuracy of the addendum and the roundness of the tooth surface are improved. Also,
Since the ribs are provided, the rigidity of the tooth surface portion is also secured.

【００１０】図３は、このような構造の感光体ドラム駆
動ギアを用いた電子写真装置の一例の要部を示す斜視図
である。２０〜４０が上記構造のギアであり、１０はＤ
Ｃモータ、５０は感光体ドラムである。ＤＣモータ１０
が回転すると、ギア２０，３０，４０が回転し、そして
感光体ドラム５０が回転する。ギア２０〜４０は上述の
ように、歯先の精度および歯面の真円度が高く、また歯
面部の剛性も確保されているため、感光体ドラムは一定
の速度でスムーズに回転する。従って、高品質の画像を
得ることができる。FIG. 3 is a perspective view showing a main part of an example of an electrophotographic apparatus using a photosensitive drum driving gear having such a structure. 20 to 40 are gears having the above structure, and 10 is D
The C motor and 50 are photosensitive drums. DC motor 10
When is rotated, the gears 20, 30, 40 are rotated, and the photosensitive drum 50 is rotated. As described above, the gears 20 to 40 have high tooth top precision and tooth surface roundness, and the rigidity of the tooth surface is ensured, so that the photosensitive drum rotates smoothly at a constant speed. Therefore, a high quality image can be obtained.

【００１１】[0011]

【発明の効果】以上説明したように本発明の電子写真装
置の感光体ドラム駆動ギアは、網の目状のリブを備え、
そのリブはギアの軸部と歯面部とを直接接続する構造を
含まない。従って、ギアを成形する際、ヒケが発生して
も、その方向が分散されるので、歯先の精度および歯面
の真円度が向上する。また、リブを備えているので、歯
面部の剛性も確保される。その結果、感光体ドラムの回
転速度の変動が少なくなり、高品質の画像を得ることが
できる。As described above, the photoconductor drum drive gear of the electrophotographic apparatus of the present invention is provided with the mesh ribs.
The rib does not include a structure that directly connects the shaft portion and the tooth surface portion of the gear. Therefore, even when a sink mark is generated when the gear is molded, the directions thereof are dispersed, so that the accuracy of the tooth tip and the roundness of the tooth surface are improved. Further, since the ribs are provided, the rigidity of the tooth surface portion is secured. As a result, fluctuations in the rotation speed of the photosensitive drum are reduced, and high quality images can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明による電子写真装置の感光体ドラム駆動
ギアの一例を示す平面図である。FIG. 1 is a plan view showing an example of a photosensitive drum drive gear of an electrophotographic apparatus according to the present invention.

【図２】図１の駆動ギアを示す断面図である。FIG. 2 is a cross-sectional view showing the drive gear of FIG.

【図３】図１の駆動ギアを用いた電子写真装置の要部を
示す斜視図である。FIG. 3 is a perspective view showing a main part of an electrophotographic apparatus using the drive gear of FIG.

【図４】従来の電子写真装置の感光体ドラム駆動ギアの
一例を示す平面図である。FIG. 4 is a plan view showing an example of a photosensitive drum drive gear of a conventional electrophotographic apparatus.

【図５】図４の駆動ギアを示す断面図である。5 is a cross-sectional view showing the drive gear of FIG.

【符号の説明】[Explanation of symbols]

１ リブ ２ 軸部 ３ 歯面部 ４，５ 同心円部分 ６ 放射状部分 １０ ＤＣモータ ２０〜４０ 感光体ドラム駆動ギア ５０ 感光体ドラム DESCRIPTION OF SYMBOLS 1 rib 2 shaft part 3 tooth surface part 4, 5 concentric part 6 radial part 10 DC motor 20-40 photoconductor drum drive gear 50 photoconductor drum

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】電子写真装置を構成し、静電潜像を形成し
てそれをトナーによって現像するための感光体ドラムを
駆動するギアにおいて、 網の目状のリブを備え、そのリブは前記ギアの軸部と歯
面部とを直接接続する構造を含まないことを特徴とする
電子写真装置の感光体ドラム駆動ギア。1. A gear for driving a photosensitive drum for forming an electrostatic latent image and developing the electrostatic latent image with toner, comprising a mesh-like rib, the rib being the aforesaid rib. A photosensitive drum driving gear for an electrophotographic apparatus, which does not include a structure for directly connecting a shaft portion and a tooth surface portion of the gear. 【請求項２】前記リブは、 一つまたは複数の直径の異なる同心円部分と、 前記ギアの軸を中心とする複数の放射状部分とから成
り、 前記同心円部分は前記ギアの軸部と歯面部との間に、前
記軸部を中心にして配置され、 前記同心円部分の一つは、複数の前記放射状部分によっ
て前記軸部と接続され、 前記同心円部分の一つは、複数の前記放射状部分によっ
て前記歯面部と接続され、 前記同心円部分が複数の場合、隣接する前記同心円部分
どうしは、複数の前記放射状部分によって接続されてい
ることを特徴とする請求項１記載の電子写真装置の感光
体ドラム駆動ギア。2. The rib comprises one or a plurality of concentric circular portions having different diameters, and a plurality of radial portions centering on the shaft of the gear, the concentric circular portion including a shaft portion and a tooth surface portion of the gear. Between the plurality of radial portions, one of the concentric circular portions is connected to the shaft portion by a plurality of the radial portions, and one of the concentric circular portions is a plurality of the radial portions. 2. The photosensitive drum drive of an electrophotographic apparatus according to claim 1, wherein when the plurality of concentric circle portions are connected to a tooth surface portion, the adjacent concentric circle portions are connected by the plurality of radial portions. gear. 【請求項３】前記同心円部分の数は２であることを特徴
とする請求項１記載の電子写真装置の感光体ドラム駆動
ギア。3. The photoconductor drum drive gear of an electrophotographic apparatus according to claim 1, wherein the number of the concentric circle portions is two.
JP6135264A 1994-06-17 1994-06-17 Photosensitive drum driving gear of electrophotographic device Pending JPH086437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6135264A JPH086437A (en) 1994-06-17 1994-06-17 Photosensitive drum driving gear of electrophotographic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6135264A JPH086437A (en) 1994-06-17 1994-06-17 Photosensitive drum driving gear of electrophotographic device

Publications (1)

Publication Number Publication Date
JPH086437A true JPH086437A (en) 1996-01-12

Family

ID=15147641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6135264A Pending JPH086437A (en) 1994-06-17 1994-06-17 Photosensitive drum driving gear of electrophotographic device

Country Status (1)

Country Link
JP (1) JPH086437A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6181899B1 (en) 1997-12-29 2001-01-30 Ricoh Company, Ltd. Vibration reducing plastic gear
US6576177B2 (en) 1997-12-29 2003-06-10 Ricoh Company, Ltd. System and method for molding a plastic gear suppressing shrinkage
JP2013020228A (en) * 2011-06-16 2013-01-31 Ricoh Co Ltd Photoreceptor drum, image forming apparatus, image forming method and process cartridge
EP3015923A1 (en) * 2014-10-30 2016-05-04 Canon Kabushiki Kaisha Image forming apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140140A (en) * 1974-04-30 1975-11-10
JPH0517666B2 (en) * 1984-01-26 1993-03-09 Shin Kobe Electric Machinery
JP4111950B2 (en) * 2002-05-30 2008-07-02 ミオカーディアル セラピューティクス インコーポレイティッド Intramyocardial injection of autologous bone marrow

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140140A (en) * 1974-04-30 1975-11-10
JPH0517666B2 (en) * 1984-01-26 1993-03-09 Shin Kobe Electric Machinery
JP4111950B2 (en) * 2002-05-30 2008-07-02 ミオカーディアル セラピューティクス インコーポレイティッド Intramyocardial injection of autologous bone marrow

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6181899B1 (en) 1997-12-29 2001-01-30 Ricoh Company, Ltd. Vibration reducing plastic gear
US6576177B2 (en) 1997-12-29 2003-06-10 Ricoh Company, Ltd. System and method for molding a plastic gear suppressing shrinkage
US7086850B2 (en) 1997-12-29 2006-08-08 Ricoh Company, Ltd. System and method for molding plastic gear suppressing shrinkage
JP2013020228A (en) * 2011-06-16 2013-01-31 Ricoh Co Ltd Photoreceptor drum, image forming apparatus, image forming method and process cartridge
EP3015923A1 (en) * 2014-10-30 2016-05-04 Canon Kabushiki Kaisha Image forming apparatus
US9535365B2 (en) 2014-10-30 2017-01-03 Canon Kabushiki Kaisha Image forming apparatus
USRE49143E1 (en) 2014-10-30 2022-07-19 Canon Kabushiki Kaisha Image forming apparatus

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