JPH07306612A - Encoder assembling structure - Google Patents
Encoder assembling structureInfo
- Publication number
- JPH07306612A JPH07306612A JP6097281A JP9728194A JPH07306612A JP H07306612 A JPH07306612 A JP H07306612A JP 6097281 A JP6097281 A JP 6097281A JP 9728194 A JP9728194 A JP 9728194A JP H07306612 A JPH07306612 A JP H07306612A
- Authority
- JP
- Japan
- Prior art keywords
- rotating member
- encoder
- pattern
- detecting element
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Optical Transform (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、複写機やプリ
ンタ等の画像形成装置において、感光体ドラム等の回転
体の回転速度を検出するためのエンコーダの組立構造に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of an encoder for detecting the rotational speed of a rotating body such as a photosensitive drum in an image forming apparatus such as a copying machine or a printer.
【０００２】[0002]
【従来の技術】一般に、カラー複写機やカラープリンタ
などのカラー画像形成装置ではマゼンタ、イエロー、シ
アン等の複数色のトナー像を記録シートに多重転写して
カラー画像を形成しており、特に画像形成速度の高速化
を図った装置として、記録シートの搬送経路に沿って各
色毎に感光体ドラムや現像器等から構成されるトナー像
の形成部を設け、搬送されてきた記録シートに複数色の
トナー像を連続的に転写する装置が提案されている。2. Description of the Related Art Generally, in a color image forming apparatus such as a color copying machine or a color printer, a toner image of a plurality of colors such as magenta, yellow and cyan is multiply transferred onto a recording sheet to form a color image. As a device for increasing the forming speed, a toner image forming unit composed of a photoconductor drum and a developing device for each color is provided along the conveying path of the recording sheet, and a plurality of colors are formed on the conveyed recording sheet. There has been proposed a device for continuously transferring the toner image.
【０００３】このようなカラー画像形成装置において色
ずれのない良好なカラー画像を形成するためには、何よ
りも先ず各トナー像形成部における感光体ドラムの回転
速度が常に一定していることが必要である。仮に、感光
体ドラムの回転速度にバラつきがあるとすれば、記録シ
ートに対するトナー像の転写位置に微妙なずれが生じ、
形成したカラー画像に色ずれが発生してしまうからであ
る。In order to form a good color image without color shift in such a color image forming apparatus, first of all, it is necessary that the rotation speed of the photosensitive drum in each toner image forming section is always constant. Is. If the rotation speed of the photoconductor drum varies, a slight shift occurs in the transfer position of the toner image on the recording sheet.
This is because color misregistration occurs in the formed color image.
【０００４】しかし、感光体ドラムにモータの駆動力を
伝達する歯車の機械的な精度誤差や、経時的な使用によ
る歯車の磨耗等により、感光体ドラムの回転速度を完全
に一定に保つことは実質的に困難である。そのため、従
来では感光体ドラムの実際の回転速度をエンコーダによ
って検出し、その検出信号に基づいてモータの回転数を
制御するシステムを採用している。However, it is impossible to keep the rotation speed of the photosensitive drum completely constant due to mechanical precision error of the gear that transmits the driving force of the motor to the photosensitive drum, wear of the gear due to use over time, and the like. Practically difficult. Therefore, conventionally, a system has been adopted in which the actual rotation speed of the photosensitive drum is detected by an encoder and the rotation speed of the motor is controlled based on the detection signal.
【０００５】従来、感光体ドラムに対するエンコーダの
取付方法としては、感光体ドラムの回転軸に対してカッ
プリングを介して市販のロータリーエンコーダの入力軸
を連結する方法が知られている（特開昭６２−１７８９
９２号公報）。しかし、この方法では、ロータリーエン
コーダの入力軸の軸心が感光体ドラムの回転軸の軸心と
完全に一致しない限り、感光体ドラムの回転速度を正確
に検出することができないという欠点がある。Conventionally, as a method for mounting an encoder on a photosensitive drum, a method is known in which an input shaft of a commercially available rotary encoder is connected to a rotary shaft of the photosensitive drum via a coupling (Japanese Patent Laid-Open Publication No. Sho. 62-1789
No. 92). However, this method has a drawback in that the rotation speed of the photosensitive drum cannot be accurately detected unless the axis of the input shaft of the rotary encoder completely coincides with the axis of the rotation shaft of the photosensitive drum.
【０００６】一方、特開昭６３−７５７５９号公報に開
示された画像形成装置では、感光体ドラムの回転軸に直
接ローターリーエンコーダが組み込まれている。具体的
には、検出パターンが形成された円盤状の回転部材を感
光体ドラムの回転軸に直接固定すると共に、感光体ドラ
ムの支持フレームに取り付けた検出素子で上記検出パタ
ーンを読み出すように構成されている。従って、感光体
ドラムの回転軸がすなわちロータリーエンコーダの入力
軸なので、前述のような欠点が生じることがなく、感光
体ドラムの回転速度を正確に検出することができるとい
った利点を備えている。On the other hand, in the image forming apparatus disclosed in Japanese Patent Laid-Open No. 63-75759, a rotary encoder is directly incorporated in the rotary shaft of the photosensitive drum. Specifically, the disk-shaped rotary member on which the detection pattern is formed is directly fixed to the rotary shaft of the photoconductor drum, and the detection pattern is read by the detection element attached to the support frame of the photoconductor drum. ing. Therefore, since the rotary shaft of the photosensitive drum is the input shaft of the rotary encoder, there is an advantage that the rotational speed of the photosensitive drum can be accurately detected without the drawbacks described above.
【０００７】[0007]
【発明が解決しようとする課題】しかし、同公報（特開
昭６３−７５７５９号公報）に示されるように感光体ド
ラムの回転軸に直接ロータリーエンコーダを組み込んだ
場合には、当該エンコーダの組立作業に手間がかかると
いった問題点がある。何故ならば、検出パターンを読み
出す検出素子は円盤状の回転部材の周縁を跨ぐようにし
て配設されるので、回転部材を先に感光体ドラムの回転
軸に固定してしまったのでは、検出素子を後から感光体
ドラムの支持フレームに固定する際に、回転部材と検出
素子とが接触してしまう可能性が高く、また、検出素子
を先に支持フレームに固定してしまったのでは、回転部
材を感光体ドラムの回転軸に嵌合させつつその周縁を検
出手段の中に挿入することは不可能だからである。However, when a rotary encoder is directly incorporated in the rotary shaft of the photosensitive drum as disclosed in the same publication (Japanese Patent Laid-Open No. 63-75759), the work of assembling the encoder is required. There is a problem that it takes time. Because the detection element that reads out the detection pattern is arranged so as to straddle the peripheral edge of the disk-shaped rotating member, it is possible that the rotating member is fixed to the rotating shaft of the photosensitive drum first. When fixing the element to the support frame of the photosensitive drum later, there is a high possibility that the rotating member and the detection element will come into contact, and if the detection element was fixed to the support frame first, This is because it is impossible to insert the rotating member into the detecting means while fitting the rotating member to the rotating shaft of the photosensitive drum.
【０００８】従って、上記回転部材及び検出素子を互い
に位置決めしながら、夫々を感光体ドラムの回転軸ある
いは支持フレームに対して同時に固定する必要が生じ、
その組立作業がたいへんに煩雑であった。Therefore, it becomes necessary to fix the rotating member and the detecting element to each other at the same time with respect to the rotating shaft of the photosensitive drum or the supporting frame.
The assembling work was very complicated.
【０００９】また、このようなエンコーダの組立作業は
感光体ドラムがその支持フレームに実装された状態で行
わなければならず、手元の作業スペースは小さくならざ
るを得なかった。このため、回転部材や検出素子が組立
作業中に周辺機器と接触し、破損を生じる恐れがあっ
た。Further, the assembling work of such an encoder must be carried out with the photosensitive drum mounted on the supporting frame thereof, and the work space at hand must be reduced. For this reason, the rotating member and the detection element may come into contact with peripheral devices during the assembling work and may be damaged.
【００１０】更に、これら回転部材と検出素子との位置
決めを正確に行わないと、感光体ドラムの回転中に回転
部材と検出素子とが接触して検出パターンに破損を生じ
たり、検出素子が回転部材の検出パターンを正確に読み
取ることができないといった不都合も生じる。Further, if the rotating member and the detecting element are not accurately positioned, the rotating member and the detecting element may come into contact with each other during the rotation of the photosensitive drum to damage the detection pattern, or the detecting element may rotate. There is also a problem that the detection pattern of the member cannot be accurately read.
【００１１】本発明はこのような問題点に鑑みなされた
ものであり、その目的とするところは、感光体ドラム等
の回転体の速度を検出するためのエンコーダを当該回転
体の回転軸に対して容易に組み付けることができ、しか
もエンコーダを構成する回転部材と検出素子との位置決
めを精度良く行うことが可能なエンコーダの組立構造を
提供することにある。The present invention has been made in view of the above problems, and an object thereof is to provide an encoder for detecting the speed of a rotating body such as a photosensitive drum with respect to a rotating shaft of the rotating body. It is an object of the present invention to provide an encoder assembly structure that can be easily assembled by using the encoder and can accurately position the rotary member and the detection element that form the encoder.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に、本発明のエンコーダの組立構造は、回転軸に嵌合す
る円盤状に形成され、周方向に沿って複数の検出パター
ンが配列された回転部材と、この回転部材と非接触の状
態で上記検出パターンを読み出すパターン検出素子とか
ら構成されるエンコーダを上記回転軸に組み付けるため
の組立構造であって、上記回転部材と、上記パターン検
出素子と、上記パターン検出素子が固定される取付基板
と、上記回転部材を覆うようにして上記取付基板に固定
される保持器とから構成され、上記回転部材の軸方向の
一端には環状段部を形成する一方、上記保持器にはこの
環状段部に遊嵌する規制孔を形成し、また、上記取付基
板には当該取付基板と上記回転部材との間に所定の間隙
を形成すると共に上記環状段部と規制孔との抜けを防止
する規制突部を形成したことを特徴とするものである。In order to achieve the above object, the assembly structure of an encoder of the present invention is formed in a disk shape that fits on a rotating shaft, and a plurality of detection patterns are arranged along the circumferential direction. An assembly structure for assembling an encoder, which comprises a rotating member and a pattern detecting element for reading out the detection pattern in a non-contact state with the rotating member, to the rotating shaft. An element, an attachment substrate to which the pattern detection element is fixed, and a holder fixed to the attachment substrate so as to cover the rotating member, and an annular step portion at one axial end of the rotating member. On the other hand, the retainer is formed with a restriction hole that loosely fits in the annular stepped portion, and the mounting board is provided with a predetermined gap between the mounting board and the rotating member. It is characterized in that the serial to form a restricting projection for preventing the escape of the annular step and the regulating hole.
【００１３】[0013]
【作用】回転部材を覆うようにして上記取付基板に固定
される保持器には、回転部材の軸方向の一端に形成され
た環状段部に遊嵌する規制孔が形成されており、当該保
持器は回転部材が上記取付基板から所定の距離以上離間
するのを防止すると共に、回転部材がその半径方向に移
動するのを防止している。また、パターン検出素子が固
定される上記取付基板には上記回転部材との間に所定の
間隙を形成する規制突部が形成されており、当該規制突
部は上記回転部材の環状段部が上記保持器の規制孔から
抜け落ちるのを防止している。すなわち、この組立構造
では上記保持器を取付基板に固定することによって、上
記回転部材がある程度の自由度を保持しつつ上記パター
ン検出素子に対して軸方向及び半径方向に位置決めされ
た状態となる。The retainer fixed to the mounting substrate so as to cover the rotating member is provided with a restriction hole which is loosely fitted in an annular step portion formed at one axial end of the rotating member. The container prevents the rotating member from being separated from the mounting substrate by a predetermined distance or more, and also prevents the rotating member from moving in the radial direction. Further, the mounting substrate to which the pattern detection element is fixed is formed with a restricting protrusion that forms a predetermined gap with the rotating member, and the restricting protrusion is the annular step of the rotating member. It prevents the holder from falling out of the restriction hole. That is, in this assembly structure, by fixing the retainer to the mounting substrate, the rotating member is positioned in the axial direction and the radial direction with respect to the pattern detecting element while maintaining a certain degree of freedom.
【００１４】従って、既に回転部材とパターン検出素子
とが位置決めされた状態にある本発明の組立構造を回転
体の回転軸に組み付けるようにすれば、パターン検出素
子を回転体の支持フレームに固定する作業と回転部材を
回転体の回転軸に固定する作業とを容易に行うことがで
き、しかもパターン検出素子と回転部材とを所定の精度
で位置決めすることができる。Therefore, if the assembly structure of the present invention in which the rotating member and the pattern detecting element are already positioned is assembled to the rotating shaft of the rotating body, the pattern detecting element is fixed to the supporting frame of the rotating body. The work and the work of fixing the rotary member to the rotary shaft of the rotary body can be easily performed, and moreover, the pattern detection element and the rotary member can be positioned with a predetermined accuracy.
【００１５】また、この組立構造では上記回転部材があ
る程度の自由度を保持しつつ上記パターン検出素子に対
して位置決めされた状態にあるので、回転部材を回転体
の回転軸に組み付ける際に、回転部材がパターン検出素
子と接触してその検出パターンが破損するのを防止する
こともできる。Further, in this assembly structure, since the rotary member is positioned with respect to the pattern detecting element while maintaining a certain degree of freedom, when the rotary member is assembled to the rotary shaft of the rotary body, the rotary member is rotated. It is also possible to prevent the member from coming into contact with the pattern detection element and damaging the detection pattern.
【００１６】[0016]
【実施例】以下、添付図面に基づいて本発明のエンコー
ダの組立構造を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An encoder assembly structure according to the present invention will be described below in detail with reference to the accompanying drawings.
【００１７】図１は電子写真複写機の感光体ドラム（回
転体）に本発明のエンコーダ組立構造を組みつけた状態
を示すものである。同図において、符号１は感光体ドラ
ム、符号２は感光体ドラム１の回転軸、符号３はこの回
転軸２を回転自在に支承する支持フレーム、符号４は上
記感光体ドラム１を駆動するモータ、符号５，６はこの
モータ４から上記回転軸２へ駆動力を伝達するギヤ、符
号７は上記モータ４を支持フレーム３に固定するブラケ
ットである。FIG. 1 shows a state in which the encoder assembly structure of the present invention is assembled to a photosensitive drum (rotating body) of an electrophotographic copying machine. In FIG. 1, reference numeral 1 is a photosensitive drum, reference numeral 2 is a rotating shaft of the photosensitive drum 1, reference numeral 3 is a support frame for rotatably supporting the rotating shaft 2, and reference numeral 4 is a motor for driving the photosensitive drum 1. Reference numerals 5 and 6 are gears for transmitting a driving force from the motor 4 to the rotary shaft 2, and reference numeral 7 is a bracket for fixing the motor 4 to the support frame 3.
【００１８】そして、本発明に係るエンコーダの組立構
造１０は上記ブラケット７に固定され、その中央には上
記感光体ドラム１の回転軸２が貫通している。The encoder assembly structure 10 according to the present invention is fixed to the bracket 7, and the rotary shaft 2 of the photosensitive drum 1 penetrates through the center thereof.
【００１９】図２は本発明に係るエンコーダの組立構造
１０の分解斜視図である。同図において、符号１１は上
記支持フレーム３に固定される取付基板、符号１２は上
記回転軸２に嵌合するリング１２ａの周囲に鍔部１２ｂ
が張り出して円盤状に形成された回転部材、符号１３は
この回転部材１２の鍔部１２ｂが挿入される凹部を有す
ると共に上記取付基板に１１固定されるパターン検出素
子、符号１４は上記回転部材１２及びパターン検出素子
１３を覆うようにして上記取付基板１１に固定される保
持器である。FIG. 2 is an exploded perspective view of the encoder assembly structure 10 according to the present invention. In the figure, reference numeral 11 is a mounting substrate fixed to the support frame 3, reference numeral 12 is a collar portion 12b around a ring 12a fitted to the rotating shaft 2.
Is a rotating member formed in a disk shape by projecting, and a reference numeral 13 is a pattern detecting element having a concave portion into which the flange portion 12b of the rotating member 12 is inserted and fixed to the mounting substrate 11 and a reference numeral 14 is the rotating member 12 And a holder fixed to the mounting substrate 11 so as to cover the pattern detection element 13.
【００２０】上記回転部材１２の鍔部１２ｂにはスリッ
ト状の検出パターン１２ｃが周方向に沿って当間隔で複
数配列されており、上記パターン検出素子１３は回転部
材の回転に伴ってこの検出パターン１２ｃを光学的に読
み取り、その検出信号を上記モータ４の制御系（図示せ
ず）へ連続的に送出する。すなわち、上記回転部材１２
に上記回転軸２を嵌合させるとロータリーエンコーダが
構成され、感光体ドラム１の回転速度に応じた検出信号
を上記パターン検出素子１３から得ることができる。A plurality of slit-shaped detection patterns 12c are arranged in the collar portion 12b of the rotary member 12 at equal intervals along the circumferential direction, and the pattern detection element 13 detects the detection patterns as the rotary member rotates. 12c is optically read and its detection signal is continuously sent to a control system (not shown) of the motor 4. That is, the rotating member 12
When the rotary shaft 2 is fitted to the rotary encoder, a rotary encoder is formed, and a detection signal corresponding to the rotation speed of the photosensitive drum 1 can be obtained from the pattern detection element 13.
【００２１】一方、上記回転部材１２のリング１２ａに
はその軸方向の一端に環状段部１５が形成され、上記保
持器１４に形成された規制孔１６がこの環状段部１５に
遊嵌するようになっている。また、上記取付基板１１に
は回転軸２が貫通する孔１７が形成され、この貫通孔１
７の周囲には回転部材１２側に突出する規制突部１８が
形成されている。この規制突部１８は回転部材１２と取
付基板１１との間に所定の間隙を形成し、上記保持器１
４を取付基板１１に固定した際に、上記リング１２ａの
環状段部１５が保持器１４の規制孔１６から抜け落ちる
のを防止している。On the other hand, an annular step portion 15 is formed at one end of the ring 12a of the rotating member 12 in the axial direction, and a restriction hole 16 formed in the cage 14 is loosely fitted in the annular step portion 15. It has become. Further, a hole 17 through which the rotary shaft 2 penetrates is formed in the mounting board 11, and the through hole 1
Around the periphery of 7, there is formed a restricting protrusion 18 that protrudes toward the rotating member 12. The restriction protrusion 18 forms a predetermined gap between the rotating member 12 and the mounting substrate 11, and the retainer 1
The ring-shaped step portion 15 of the ring 12 a is prevented from slipping out of the restriction hole 16 of the cage 14 when the ring 4 is fixed to the mounting substrate 11.
【００２２】上記規制突部１８は取付基板１１の貫通孔
１７の内周に対して合成樹脂のアウトサート成形により
形成されている。あるいは合成樹脂からなる環状部材を
貫通孔１７の内周縁に熱溶着等の手法で固定してもよ
い。The regulating projection 18 is formed on the inner periphery of the through hole 17 of the mounting substrate 11 by outsert molding of synthetic resin. Alternatively, an annular member made of synthetic resin may be fixed to the inner peripheral edge of the through hole 17 by a method such as heat welding.
【００２３】また、この実施例においては、上記保持器
１４は回転部材１２及びパターン検出素子１３の保護カ
バーとしても機能しており、これを取付基板１１に固定
すると、検出パターン１２ｃが形成された回転部材１２
の鍔部２ｂ並びに上記パターン検出素子１３が周辺雰囲
気から略密閉されるようになっている。Further, in this embodiment, the holder 14 also functions as a protective cover for the rotating member 12 and the pattern detecting element 13. When this holder is fixed to the mounting substrate 11, the detecting pattern 12c is formed. Rotating member 12
The collar portion 2b and the pattern detection element 13 are substantially sealed from the surrounding atmosphere.
【００２４】このように構成された本実施例のエンコー
ダ組立構造１０は、先ず、螺子２０で上記パターン検出
素子１３を取付基板１１の所定の位置に固定した後、上
記回転部材１２の鍔部１２ｂをパターン検出素子１３に
凹部内に挿入し、次いで螺子２１で保持器１４を取付基
板１１に固定して、回転部材１２及びパターン検出素子
１３を上記保持器１４で覆うようにして組立られる。In the encoder assembly structure 10 of the present embodiment constructed as described above, first, the pattern detecting element 13 is fixed to a predetermined position of the mounting substrate 11 by the screw 20, and then the flange portion 12b of the rotating member 12 is fixed. Is inserted into the concave portion of the pattern detecting element 13, and then the holder 14 is fixed to the mounting substrate 11 with the screw 21 so that the rotating member 12 and the pattern detecting element 13 are covered with the holder 14.
【００２５】このとき、本実施例の組立構造１０では、
回転部材１２のリング１２ａに形成した環状段部１５に
保持器１４の規制孔１６が遊嵌すると共に、取付基板１
１に形成された規制突部１８が上記環状段部１５と規制
孔１６との抜けを防止しているので、上記保持器１４を
取付基板１１に固定した後は、上記回転部材１２が環状
段部１５と規制孔１６との隙間分の自由度をもって上記
取付基板１１に位置決めされる。At this time, in the assembly structure 10 of this embodiment,
The restriction hole 16 of the retainer 14 is loosely fitted in the annular step portion 15 formed in the ring 12a of the rotating member 12, and the mounting substrate 1
Since the restriction projection 18 formed on the first part prevents the annular step 15 and the restriction hole 16 from coming off, the rotary member 12 is fixed to the annular step after the retainer 14 is fixed to the mounting substrate 11. The mounting board 11 is positioned with a degree of freedom corresponding to a gap between the portion 15 and the restriction hole 16.
【００２６】従って、未だ感光体ドラム１の回転軸２が
回転部材１２のリング１２ａに嵌合していない状態であ
っても、取付基板１１に固定されたパターン検出素子１
３に対して回転部材１２が位置決めされる。Therefore, even when the rotary shaft 2 of the photosensitive drum 1 is not yet fitted to the ring 12a of the rotary member 12, the pattern detecting element 1 fixed to the mounting substrate 11 is provided.
The rotating member 12 is positioned with respect to 3.
【００２７】そして、以上のように組立られた本実施例
のエンコーダの組立構造１０は、図３に示すように、上
記ブラケット７から突出している感光体ドラムの回転軸
２に組み付けられて使用される。組み付けに当たって
は、先ず取付基板１１の貫通孔１７を介して感光体ドラ
ム１の回転軸２を回転部材１２のリング１２ａに嵌合さ
せ、次に取付基板１１を螺子２２によって上記ブラケッ
ト７の所定の位置に固定する。As shown in FIG. 3, the encoder assembly structure 10 of the present embodiment assembled as described above is used by being assembled to the rotary shaft 2 of the photosensitive drum projecting from the bracket 7. It In assembling, first, the rotary shaft 2 of the photosensitive drum 1 is fitted into the ring 12a of the rotary member 12 through the through hole 17 of the mounting substrate 11, and then the mounting substrate 11 is fixed to the bracket 7 by the screw 22. Lock in position.
【００２８】回転軸２には予めスナップリング２３が固
定されており、回転部材１２はこのスナップリング２３
によって回転軸上の所定の位置に係止される。また、回
転部材の１２の回転軸２への固定は、リング１２ａに螺
合する螺子２４を回転軸に突き当てて行われる。上記保
持器１４の周壁の一部に形成した切欠部１９は、上記螺
子２４をリング１２ａに螺合させる際に必要となる。A snap ring 23 is previously fixed to the rotary shaft 2, and the rotary member 12 has the snap ring 23.
Is locked at a predetermined position on the rotating shaft. Further, the fixing of the rotary member 12 to the rotary shaft 2 is performed by abutting a screw 24 screwed to the ring 12a against the rotary shaft. The notch 19 formed in a part of the peripheral wall of the cage 14 is necessary when the screw 24 is screwed into the ring 12a.
【００２９】この一連の組み付け作業においては、既に
回転部材１２とパターン検出素子１３とが位置決めされ
た状態にあるので、回転部材１２を回転軸２に固定する
に当たっては回転部材１２とパターン検出素子１３との
位置関係を考慮する必要は一切ない。従って、単に機械
的に回転部材１２と回転軸２とを嵌合させ、これらの間
を固定すれば良く、組み付け作業の手元スペースが狭い
場合であっても容易にこの作業を行うことができる。In this series of assembling operations, since the rotating member 12 and the pattern detecting element 13 are already positioned, when fixing the rotating member 12 to the rotating shaft 2, the rotating member 12 and the pattern detecting element 13 are fixed. There is no need to consider the positional relationship with. Therefore, it suffices to simply mechanically fit the rotary member 12 and the rotary shaft 2 and fix them between them, and this work can be easily performed even when the hand space for the assembly work is small.
【００３０】また、回転部材１２が回転軸２に嵌合する
以前から回転部材１２とパターン検出素子１３とが位置
決めされているので、回転軸２を回転部材１２に嵌合さ
せる際に、回転部材１２に形成された検出パターン１２
ｃがパターン検出素子１３と接触して破損する危険性を
完全に排除することができる。Further, since the rotary member 12 and the pattern detection element 13 are positioned before the rotary member 12 is fitted to the rotary shaft 2, the rotary member is fitted when the rotary shaft 2 is fitted to the rotary member 12. Detection pattern 12 formed on 12
It is possible to completely eliminate the risk that c is damaged by coming into contact with the pattern detection element 13.
【００３１】更に、本実施例の組立構造１０では、保持
器１４が回転部材１２及びパターン検出素子１３を略完
全に覆っているので、この組立構造１０を感光体ドラム
１の回転軸２に組み付ける際に、回転部材１２あるいは
パターン検出素子１３が回転軸２の周辺機器と接触して
破損する危険性を排除することもできる。Further, in the assembly structure 10 of this embodiment, the holder 14 covers the rotating member 12 and the pattern detecting element 13 almost completely, so that the assembly structure 10 is assembled to the rotating shaft 2 of the photosensitive drum 1. At this time, it is possible to eliminate the risk that the rotating member 12 or the pattern detecting element 13 may be damaged by coming into contact with peripheral equipment of the rotating shaft 2.
【００３２】尚、この実施例では感光体ドラムの速度検
出用エンコーダに本発明を適用した例を説明したが、本
発明は回転体の位置検出用エンコーダ等にも適用し得る
ものである。In this embodiment, the example in which the present invention is applied to the speed detecting encoder for the photosensitive drum has been described, but the present invention can also be applied to the position detecting encoder for the rotating body.
【００３３】[0033]
【発明の効果】以上説明してきたように、本発明のエン
コーダの組立構造によれば、回転体の回転軸を検出パタ
ーンが形成された回転部材に嵌合させる以前の段階にお
いて、上記回転部材がある程度の自由度を保持しつつパ
ターン検出素子に対して軸方向及び半径方向に位置決め
された状態となるので、この組立構造をそのまま回転体
の回転軸に組み付ければ、エンコーダを構成する回転部
材と検出素子との位置決めを考慮することなく、エンコ
ーダを当該回転体の回転軸に対して容易に組み付けるこ
とができる。As described above, according to the assembly structure of the encoder of the present invention, the rotary member is installed at a stage before the rotary shaft of the rotary body is fitted to the rotary member on which the detection pattern is formed. Since it is positioned in the axial direction and the radial direction with respect to the pattern detection element while maintaining a certain degree of freedom, if this assembly structure is directly attached to the rotary shaft of the rotating body, it becomes a rotary member that constitutes an encoder. The encoder can be easily assembled to the rotary shaft of the rotary body without considering the positioning with the detection element.
【００３４】また、本発明の組立構造では、回転部材が
パターン検出素子に対して位置決めされた状態にあるの
で、回転部材を回転体の回転軸に嵌合させる際に、回転
部材がパターン検出素子と接触して検出パターンが破損
する危険性を完全に回避することができる。Further, in the assembly structure of the present invention, since the rotating member is positioned with respect to the pattern detecting element, when the rotating member is fitted on the rotating shaft of the rotating body, the rotating member is moved to the pattern detecting element. It is possible to completely avoid the risk of the detection pattern being damaged by contact with the detection pattern.
【図１】 本発明のエンコーダの組立構造を回転体の回
転軸に実装した状態を示す断面図である。FIG. 1 is a cross-sectional view showing a state in which an encoder assembly structure of the present invention is mounted on a rotating shaft of a rotating body.
【図２】 本発明のエンコーダの組立構造の実施例を示
す分解斜視図である。FIG. 2 is an exploded perspective view showing an embodiment of the assembly structure of the encoder of the present invention.
【図３】 実施例に係るエンコーダの組立構造の回転軸
への組みつけ方法を示す分解斜視図である。FIG. 3 is an exploded perspective view showing a method of assembling the assembly structure of the encoder according to the embodiment to the rotary shaft.
１…感光体ドラム（回転体）、２…回転軸、１１…取付
基板、１２…回転部材、１２ｃ…検出パターン、１３パ
ターン検出素子、１４…保持器、１５…環状段部、１６
…規制孔、１８…規制突部DESCRIPTION OF SYMBOLS 1 ... Photosensitive drum (rotating body), 2 ... Rotating shaft, 11 ... Mounting substrate, 12 ... Rotating member, 12c ... Detection pattern, 13 pattern detection element, 14 ... Holder, 15 ... Annular step part, 16
… Regulating hole, 18… Regulating protrusion
Claims (2)
方向に沿って複数の検出パターンが配列された回転部材
と、この回転部材と非接触の状態で上記検出パターンを
読み出すパターン検出素子とから構成されるエンコーダ
を上記回転軸に組み付けるための組立構造であって、 上記回転部材と、上記パターン検出素子と、上記パター
ン検出素子が固定される取付基板と、上記回転部材を覆
うようにして上記取付基板に固定される保持器とから構
成され、上記回転部材の軸方向の一端には環状段部を形
成する一方、上記保持器にはこの環状段部に遊嵌する規
制孔を形成し、また、上記取付基板には当該取付基板と
上記回転部材との間に所定の間隙を形成すると共に上記
環状段部と規制孔との抜けを防止する規制突部を形成し
たことを特徴とするエンコーダの組立構造。1. A rotary member, which is formed in a disk shape to be fitted to a rotary shaft and has a plurality of detection patterns arranged in the circumferential direction, and pattern detection for reading the detection pattern in a non-contact state with the rotary member. An assembly structure for assembling an encoder composed of an element on the rotating shaft, wherein the rotating member, the pattern detecting element, a mounting substrate to which the pattern detecting element is fixed, and the rotating member are covered. And a retainer fixed to the mounting substrate, and an annular step is formed at one end of the rotating member in the axial direction, while the retainer has a restriction hole loosely fitted in the annular step. In addition, the mounting board is formed with a regulation gap that forms a predetermined gap between the mounting board and the rotating member and that prevents the annular step and the regulation hole from coming off. To Assembled structure of the encoder.
おいて、上記保持器は回転部材の保護カバーであること
を特徴とするエンコーダの組立構造。2. The encoder assembly structure according to claim 1, wherein the retainer is a protective cover for a rotary member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09728194A JP3171003B2 (en) | 1994-05-11 | 1994-05-11 | Encoder assembly structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09728194A JP3171003B2 (en) | 1994-05-11 | 1994-05-11 | Encoder assembly structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07306612A true JPH07306612A (en) | 1995-11-21 |
| JP3171003B2 JP3171003B2 (en) | 2001-05-28 |
Family
ID=14188137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09728194A Expired - Fee Related JP3171003B2 (en) | 1994-05-11 | 1994-05-11 | Encoder assembly structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3171003B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0790536A2 (en) * | 1996-02-16 | 1997-08-20 | Lexmark International, Inc. | Multiple function encoder wheel for cartridges utilized in an electrophotographic output device |
| US5962783A (en) * | 1996-07-15 | 1999-10-05 | Ricoh Company, Ltd. | Apparatus for detecting rotational speed |
| US5995772A (en) * | 1996-02-16 | 1999-11-30 | Lexmark International Inc. | Imaging apparatus cartridge including an encoded device |
| US6009285A (en) * | 1996-02-16 | 1999-12-28 | Lexmark International, Inc. | Method for determining characteristics of an electrophotographic cartridge carrying a rotatable element |
| JP2015001464A (en) * | 2013-06-17 | 2015-01-05 | 株式会社安川電機 | Motor with encoder |
-
1994
- 1994-05-11 JP JP09728194A patent/JP3171003B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0790536A2 (en) * | 1996-02-16 | 1997-08-20 | Lexmark International, Inc. | Multiple function encoder wheel for cartridges utilized in an electrophotographic output device |
| EP0790536A3 (en) * | 1996-02-16 | 1998-09-30 | Lexmark International, Inc. | Multiple function encoder wheel for cartridges utilized in an electrophotographic output device |
| US5942067A (en) * | 1996-02-16 | 1999-08-24 | Lexmark International, Inc. | Apparatus and method for encoding an encoder wheel |
| US5995772A (en) * | 1996-02-16 | 1999-11-30 | Lexmark International Inc. | Imaging apparatus cartridge including an encoded device |
| US6009285A (en) * | 1996-02-16 | 1999-12-28 | Lexmark International, Inc. | Method for determining characteristics of an electrophotographic cartridge carrying a rotatable element |
| US6169860B1 (en) | 1996-02-16 | 2001-01-02 | Lexmark International, Inc. | Toner cartridge having encoded wheel |
| US6295422B1 (en) | 1996-02-16 | 2001-09-25 | Lexmark International, Inc. | Encoded wheel for a toner cartridge |
| US6397015B2 (en) | 1996-02-16 | 2002-05-28 | Lexmark International, Inc. | Encoded device having positioned indicia for use with a toner cartridge |
| EP1522904A3 (en) * | 1996-02-16 | 2008-04-16 | Lexmark International, Inc. | Multiple function encoder wheel for cartridges utilized in an electrographic output device |
| US5962783A (en) * | 1996-07-15 | 1999-10-05 | Ricoh Company, Ltd. | Apparatus for detecting rotational speed |
| JP2015001464A (en) * | 2013-06-17 | 2015-01-05 | 株式会社安川電機 | Motor with encoder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3171003B2 (en) | 2001-05-28 |
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