JPH08188297A - Paper thickness detecting device - Google Patents

Paper thickness detecting device

Info

Publication number
JPH08188297A
JPH08188297A JP200095A JP200095A JPH08188297A JP H08188297 A JPH08188297 A JP H08188297A JP 200095 A JP200095 A JP 200095A JP 200095 A JP200095 A JP 200095A JP H08188297 A JPH08188297 A JP H08188297A
Authority
JP
Japan
Prior art keywords
recording material
roller
thickness
pair
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP200095A
Other languages
Japanese (ja)
Inventor
Tomohiro Aoki
友洋 青木
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP200095A priority Critical patent/JPH08188297A/en
Publication of JPH08188297A publication Critical patent/JPH08188297A/en
Withdrawn legal-status Critical Current

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  • Color Electrophotography (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Ink Jet (AREA)
  • Handling Of Cut Paper (AREA)

Abstract

PURPOSE: To perform accurate detection of various thicknesses by a method wherein the central part in a longitudinal direction of one rotary body of a rotary body pair is formed of a resilient member having width lower than that of a minimum paper sheet and the tow sides thereof are formed of a rigid member. CONSTITUTION: A conveyance roller 50 is longitudinally divided into three sections. The two sides thereof are formed of a metal or resin 51, such as polyacetal, having high rigidity, and a central part 52 is formed of a resilient substance, such as airlenepropylene resin and chloroprene rubber, having a high friction factor. The width in a longitudinal direction of the central part 52 formed of a resilient substance is set to a value lower than that of a minimum width recording material. This constitution performs displacement in a ratio of approximate 1:1 to thickness between conveyance roller pair 42 and 50 during nipping of a recording material, effects detection of an accurate thickness. Further, defective nipping of paper sheets and skew of a paper sheet hardly occurs, and high-precise conveyance of paper sheets is practicable.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は画像形成を行う記録材と
してのシートの厚さに応じて、画像形成を行う際の諸条
件を最適化する必要がある電子写真方式の画像形成装置
やインクジェット式の画像形成装置などに好適なシート
厚検知装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic image forming apparatus or ink jet system in which various conditions for forming an image need to be optimized according to the thickness of a sheet as a recording material for forming an image. The present invention relates to a sheet thickness detection device suitable for a conventional image forming apparatus and the like.

【0002】[0002]

【従来の技術】近年、電子写真方式やインクジェット方
式の画像形成技術が発達し、装置側ではフルカラーで画
像形成が行えるものも広く普及し始めている。一方、記
録材側ではより広範な種類のもの画像形成を行う為様々
な種類が開発されている。
2. Description of the Related Art In recent years, image forming techniques such as electrophotography and ink jet have been developed, and devices capable of full-color image formation have become widespread. On the other hand, on the recording material side, various types have been developed to form a wider variety of images.

【0003】特にカラー画像形成装置では厚紙に記録を
行うと品位の高い画像が得られるため、様々な厚さの記
録材に対応して画像形成を行うことが要求されている。
Particularly, in a color image forming apparatus, since high quality images can be obtained by recording on thick paper, it is required to form images corresponding to recording materials of various thicknesses.

【0004】しかし、様々な厚さの記録材に対応しつ
つ、画質を維持するためには、画像形成時の諸条件を最
適化する必要がある。
However, it is necessary to optimize various conditions at the time of image formation in order to maintain the image quality while dealing with recording materials of various thicknesses.

【0005】例えば、電子写真方式の記録材上に転写さ
れたトナーを加熱、加圧し、溶融、定着させる定着プロ
セスでは、記録材が薄い場合と厚い場合とで必要になる
熱量が異なるため、記録材の厚さに応じて定着時の温度
を制御する必要がある。
For example, in a fixing process in which toner transferred onto an electrophotographic recording material is heated, pressurized, melted, and fixed, the amount of heat required differs depending on whether the recording material is thin or thick. It is necessary to control the temperature during fixing according to the thickness of the material.

【0006】また、同材質の記録材でも厚さが異なると
体積抵抗値も異なるため、均質な画像を得るためには転
写プロセスにおいて、転写帯電器を駆動する転写電流も
記録材の厚さに応じて変化させることが必要である。
Further, even if the recording materials of the same material have different thicknesses, the volume resistance values also differ. Therefore, in order to obtain a uniform image, the transfer current for driving the transfer charger also depends on the thickness of the recording material in the transfer process. It is necessary to change accordingly.

【0007】一方、インクジェット記録方式において
は、記録ヘッドと記録材の距離が画質に大きな影響を与
える。そして、常に一定の画質を維持するためには記録
材の厚さに関わらず、記録材表面と記録ヘッドとの距離
を一定に保つ必要がある。
On the other hand, in the ink jet recording system, the distance between the recording head and the recording material has a great influence on the image quality. In order to always maintain a constant image quality, it is necessary to keep the distance between the surface of the recording material and the recording head constant regardless of the thickness of the recording material.

【0008】また、画像形成をシリアルスキャン方式で
行うため、記録材を正確に記録幅に等しい量で間欠的に
搬送する必要があるが、搬送ローラーの回転角が一定で
ある場合、記録材の厚さに応じて記録材の搬送量が変化
する。
Further, since the image formation is performed by the serial scan system, it is necessary to intermittently convey the recording material accurately in an amount equal to the recording width. However, when the rotation angle of the conveying roller is constant, the recording material is The conveyance amount of the recording material changes depending on the thickness.

【0009】上記に述べた問題点を解決するため、近
年、記録材の厚さを検出する手段を備えた画像形成装置
が開発されている。
In order to solve the above-mentioned problems, an image forming apparatus having means for detecting the thickness of a recording material has been developed in recent years.

【0010】従来、記録材の厚さを検出するためには図
7に示す機構が多く用いられてきた。
Conventionally, the mechanism shown in FIG. 7 has been often used to detect the thickness of the recording material.

【0011】即ち、搬送ローラ対63、64、搬送ガイ
ド67、搬送ローラ対65、66より構成される記録材
の搬送路に、軸61aによって回動可能に軸支されたア
クチュエーター61を配し、コイルスプリング68によ
ってアクチュエータ68を時計方向に回動するように付
勢する。搬送ローラ対63、64によって搬送ガイド6
7上を矢印方向に搬送される記録材の先端がアクチュエ
ーター61を押し上げて反時計方向に回転させ、その回
動を反射型のフォトセンサ62によって検出して記録材
の厚さを検出する。
That is, an actuator 61 rotatably supported by a shaft 61a is arranged in a recording material conveying path constituted by conveying roller pairs 63 and 64, a conveying guide 67, and conveying roller pairs 65 and 66. The coil spring 68 urges the actuator 68 to rotate clockwise. The conveying guide 6 is formed by the conveying roller pairs 63 and 64.
The tip of the recording material conveyed in the direction of the arrow 7 pushes up the actuator 61 to rotate it counterclockwise, and the rotation is detected by the reflection type photo sensor 62 to detect the thickness of the recording material.

【0012】この方法は機構が簡略でかつ紙を直接セン
シングしないため色のついた記録材、またはOHPなど
の透明な記録材に関しても容易に検出する事ができる。
また支点から記録材までの距離(A)とセンサ62まで
の距離(a)の比を変える事により紙厚を増幅して検出
できる利点がある。
Since this method has a simple mechanism and does not directly sense the paper, it can easily detect a colored recording material or a transparent recording material such as OHP.
Further, there is an advantage that the paper thickness can be amplified and detected by changing the ratio of the distance (A) from the fulcrum to the recording material and the distance (a) to the sensor 62.

【0013】[0013]

【発明が解決しようとする課題】しかしながら、上述し
た従来例では広範な種類の記録材の厚さを検出すること
が困難である。例えば、厚さの薄い記録材に対応するた
めにはアクチュエーターの付勢圧を最小限にする必要が
ある。しかし、その様な状態でカール状態にある比較的
厚い記録材の厚さを検出することは困難である。カール
を抑えるために付勢圧を大きくした場合、薄い記録材の
搬送が困難になる。
However, in the above-mentioned conventional example, it is difficult to detect the thickness of a wide variety of recording materials. For example, it is necessary to minimize the urging pressure of the actuator in order to cope with a thin recording material. However, it is difficult to detect the thickness of a relatively thick recording material in a curled state in such a state. When the urging pressure is increased to suppress the curl, it becomes difficult to convey a thin recording material.

【0014】この点を改善するのが記録材を挟持して搬
送するローラー対を構成し、その軸間距離の変化を検出
することで記録材の厚さを判別する方法である。
In order to improve this point, a method of determining the thickness of the recording material by forming a pair of rollers for nipping and conveying the recording material and detecting a change in axial distance between the rollers.

【0015】軸間距離の測定方法としては、一方のロー
ラーと一体に支持された部材から、他方のローラーと一
体に支持された部材迄の距離をギャップセンサで測定す
る方法、或いは、さらに安価な方法として、一方のロー
ラーと一体に支持された部材に反射型のフォトセンサを
搭載し、他方のローラーと一体に支持された部材へ赤外
光を照射し、その距離に応じて変化する反射光を測定す
る方法等がある。
As a method for measuring the distance between the shafts, a distance from a member integrally supported with one roller to a member integrally supported with the other roller is measured by a gap sensor, or a more inexpensive method. As a method, a reflection type photo sensor is mounted on a member integrally supported with one roller, infrared light is applied to the member integrally supported with the other roller, and reflected light changes according to the distance. There is a method of measuring.

【0016】[0016]

【課題を解決するための手段および作用】本発明は、上
記欠点に鑑みなされたもので、多種多様の厚さを正確に
検知できるシート厚検知装置を提供することを目的とす
る。
SUMMARY OF THE INVENTION The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a sheet thickness detecting device capable of accurately detecting a wide variety of thicknesses.

【0017】上記目的を達成するために、シートを搬送
及び挾持する回転体対の一方がその回転体の長手方向中
央部に、最小シート巾より狭い長さを有する弾性部材と
その両側が剛性部材よりなることを特徴とするシート厚
検知装置である。
In order to achieve the above object, one of a pair of rotating bodies for transporting and holding a sheet is located at a central portion in the longitudinal direction of the rotating body and has an elastic member having a length narrower than a minimum sheet width and rigid members on both sides thereof. The sheet thickness detection device is characterized by comprising:

【0018】特に、シートを斜行、スリップ等なく安定
して搬送しつつ、正確なシートの厚みが検知できる、シ
ート厚検知装置を提供することを目的としている。
In particular, it is an object of the present invention to provide a sheet thickness detecting device capable of accurately detecting the thickness of a sheet while stably conveying the sheet without skew or slip.

【0019】[0019]

【実施例】図1は本発明を最も良く表す画像形成装置の
記録材としてのシートの厚さを検知する検出部の概略図
である。図2にこの場合の動作を表すフローチャートを
示す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a detecting section for detecting the thickness of a sheet as a recording material of an image forming apparatus which best represents the present invention. FIG. 2 shows a flowchart showing the operation in this case.

【0020】図1において1及び2は記録材を挟持、搬
送するローラー対で、1は搬送ローラー、2は加圧ロー
ラーである。10は前記ローラー対より、記録材搬送方
向上流に配置された透過型のフォトセンサで記録材が光
路を遮断する事で記録材の先端を検出する。同ローラー
対1、2は各々、その軸端にローラーと一体で回転する
歯車3及び4が取り付けられている。前記歯車はそのピ
ッチ円直径が各ローラーの外径と略等しいため、互いに
噛み合い、各ローラーの回転方向の位相関係は常に一定
である。この位相関係が一定になる事の利点は記録材の
厚さを検出する際の動作に関わってくるため後述する。
前記歯車3にはローラー1、2を駆動するためのモータ
ー等の駆動源5が配されている。前記ローラー1、2は
ベアリング14を介して支持部材6で支持されており、
特に加圧ローラー2は矢印a方向にのみ移動可能に支持
されており、その両端部をバネ7で搬送ローラー1に圧
接する方向に附勢されている。両ローラーの材質は変形
を防止するため、共に金属である。またローラーで記録
材を狭持する場合、ローラー対の偏心が測定時の誤差に
なるために極めて高精度に加工する必要がある。例えば
各々のローラーが20μmずつ偏心している場合、ロー
ラー対を構成したときの双方のローラーの軸距離は位相
によって最大±40μmの変化が生じるため100μと
200μの記録材を判別する事も困難になるからであ
る。
In FIG. 1, 1 and 2 are a pair of rollers for sandwiching and carrying a recording material, 1 is a carrying roller, and 2 is a pressure roller. Reference numeral 10 denotes a transmissive photosensor arranged upstream of the pair of rollers in the recording material conveyance direction, and detects the leading end of the recording material by blocking the optical path of the recording material. Each of the roller pairs 1 and 2 has gears 3 and 4 attached to the shaft ends thereof so as to rotate integrally with the rollers. Since the pitch circle diameter of the gear is substantially equal to the outer diameter of each roller, they mesh with each other and the phase relationship in the rotation direction of each roller is always constant. The advantage that the phase relationship is constant is related to the operation when detecting the thickness of the recording material, and will be described later.
The gear 3 is provided with a drive source 5 such as a motor for driving the rollers 1, 2. The rollers 1 and 2 are supported by a support member 6 via a bearing 14,
In particular, the pressure roller 2 is supported so as to be movable only in the direction of the arrow a, and both ends of the pressure roller 2 are urged by springs 7 in a direction in which the pressure roller 2 is pressed against the transport roller 1. Both rollers are made of metal to prevent deformation. Further, when the recording material is held by the rollers, the eccentricity of the roller pair causes an error during measurement, and therefore it is necessary to process the recording material with extremely high accuracy. For example, when each roller is eccentric by 20 μm, it is difficult to distinguish between 100 μ and 200 μ recording materials because the axial distance of both rollers when forming a roller pair changes by ± 40 μm depending on the phase. Because.

【0021】搬送ローラー1の支持部材6には反射型の
フォトセンサ8が取り付けられている。同センサ8は加
圧ローラー2の軸端へ向けて発光素子により、赤外光を
照射し、同部で反射した反射光を受光素子で受けること
により、反射光量に応じた電圧を出力する。この場合、
ローラ対の距離にほぼ比例した出力電圧が前記センサよ
り得られる。しかしながらローラーのような円筒形状の
ものの変位を計ろうとした場合センサの取付誤差が測定
値に影響を及ぼす。ローラーの曲率を小さくするために
ローラーの径を大きくする事は装置の大型化につながり
好ましくない。そこでセンサが発光素子と受光素子を持
つ場合、発光素子と受光素子を軸方向に配置している。
センサからの出力はAD変換器(15)によりデジタル
信号化された後中央演算装置(CPU)9に送られる。
A reflection type photo sensor 8 is attached to the supporting member 6 of the conveying roller 1. The sensor 8 emits infrared light toward the shaft end of the pressure roller 2 with a light emitting element and receives the reflected light reflected by the same portion with a light receiving element, thereby outputting a voltage according to the amount of reflected light. in this case,
An output voltage approximately proportional to the distance between the pair of rollers is obtained from the sensor. However, when trying to measure the displacement of a cylindrical object such as a roller, the sensor installation error affects the measured value. Increasing the diameter of the roller in order to reduce the curvature of the roller leads to an increase in the size of the device, which is not preferable. Therefore, when the sensor has a light emitting element and a light receiving element, the light emitting element and the light receiving element are arranged in the axial direction.
The output from the sensor is converted into a digital signal by the AD converter (15) and then sent to the central processing unit (CPU) 9.

【0022】さて本装置で実際に記録材の厚さを検出す
る際の動作を図2のフローチャートを参照しながら以下
に説明する。
Now, the operation for actually detecting the thickness of the recording material with this apparatus will be described below with reference to the flowchart of FIG.

【0023】本装置の場合は記録材の厚さが150μ以
上の場合とそれ未満の場合で画像形成プロセスを切り替
える必要がある。本装置ではあらかじめローラー対に記
録材が狭持されていない場合の反射型フォトセンサの出
力値がメモリに記録されている。
In the case of this apparatus, it is necessary to switch the image forming process depending on whether the recording material has a thickness of 150 μm or more or less. In this apparatus, the output value of the reflective photosensor when the recording material is not held between the roller pair is recorded in the memory in advance.

【0024】上流方向より搬送されてきた記録材13は
その先端が透過型フォトセンサ10を遮光した時点で同
センサ10の出力が変化し、その到達を検出する(ステ
ップS1)。センサ10がシート先端を検知すると、ク
ロックパルスのカウントを開始し(ステップS2)、所
定時間経過したか否かを監視し、所定時間経過したと判
断すると(ステップS3)同時にCPU9は駆動源5を
駆動し、ローラー対1、2は記録材の搬送速度に等しい
周速で回転し始める(ステップS4)。記録材13の先
端がローラー対に到達すると、ローラー対に挟持され更
に搬送される。記録材13を挟持した時点でローラー対
の軸間距離は記録材の厚さに相当する分増加するが、そ
の距離はローラー対の偏心の影響でローラー対の回転に
伴い時事刻々変化している。しかしながら前述したよう
に搬送ローラー1と加圧ローラー2は歯車3、4で噛み
合わさっているため図3に示すように周期的な波形がセ
ンサ10より出力される。
The recording material 13 conveyed from the upstream direction changes its output when the tip of the recording material 13 shields the transmission type photosensor 10, and detects the arrival thereof (step S1). When the sensor 10 detects the leading edge of the sheet, it starts counting clock pulses (step S2), monitors whether a predetermined time has passed, and determines that the predetermined time has passed (step S3), at the same time, the CPU 9 turns the drive source 5 on. When driven, the roller pairs 1 and 2 start rotating at a peripheral speed equal to the conveying speed of the recording material (step S4). When the leading end of the recording material 13 reaches the roller pair, it is nipped by the roller pair and further conveyed. When the recording material 13 is nipped, the axial distance of the roller pair increases by the amount corresponding to the thickness of the recording material, but the distance changes with the rotation of the roller pair due to the eccentricity of the roller pair. . However, as described above, since the transport roller 1 and the pressure roller 2 are meshed with each other by the gears 3 and 4, a periodic waveform is output from the sensor 10 as shown in FIG.

【0025】そのためローラーの回転周期T1または半
周期T2または4分の1周期T3ごとにデータを取り込
めばローラー対の偏心が10μずつあっても、以降に記
述する平均化の処理をする事によりローラ対の偏心の大
きさに左右されないセンサの出力値を算出する事ができ
る。
Therefore, if data is taken in every rotation cycle T1 or half cycle T2 or quarter cycle T3 of the roller, even if the eccentricity of the roller pair is 10 μ, the roller can be processed by the averaging process described below. It is possible to calculate the output value of the sensor that is not affected by the size of the eccentricity of the pair.

【0026】記録材13がローラー対上流側のセンサ1
0に到達した時点から、ローラー対は回転を始めるが、
回転を始めた時点からシートがローラ対1、2によって
挟持されるのに充分なある時間(T)経った後、T1ま
たはT2またはT3ごとにデーターをメモリにストアす
る(ステップS8)。このデーター点数が予めメモリさ
れている所定数に達した時点でデータを加算し所定数で
除算して平均値を算出し(ステップS9)メモリにスト
アする。そして予めメモリ内にストアされている値(記
録材がローラ対に狭持される前の値)を減算する。そし
てメモリにストアされている、ローラー対が150μの
記録材を挟持した場合の電圧値と比較し記録材の厚さを
判定する(ステップS10)。
The recording material 13 is the sensor 1 on the upstream side of the roller.
The roller pair starts rotating from the time when it reaches 0,
After a certain time (T) sufficient for the sheet to be nipped by the roller pairs 1 and 2 from the time when the rotation is started, data is stored in the memory every T1, T2 or T3 (step S8). When the number of data points reaches a predetermined number stored in advance, the data is added and divided by the predetermined number to calculate an average value (step S9), which is stored in the memory. Then, the value stored in advance in the memory (the value before the recording material is held between the roller pair) is subtracted. Then, the thickness of the recording material is determined by comparing it with the voltage value stored in the memory when the roller pair sandwiches the recording material of 150 μ (step S10).

【0027】(他の実施例1)紙厚を検出するために1
対の金属ローラー対を用いる事を述べた。しかしながら
画像形成装置にこのローラー対をいれると装置の大型化
につながり好ましくない。改善策としては今まで用いて
いたローラ対を紙厚を検出可能な構成に変える事が考え
られる。
(Other Embodiment 1) 1 for detecting the paper thickness
The use of a pair of metal rollers is described. However, it is not preferable to add this roller pair to the image forming apparatus because the apparatus becomes large. As a remedy, it is conceivable to change the roller pair that has been used so far to a configuration that can detect the paper thickness.

【0028】さて、画像形成装置にさまざまな厚さの紙
を通すために図4に示すようにレジストローラー対40
の前に引き抜きローラー対が配置されている。搬送ロー
ラ41と加圧ローラ42より構成され、通常搬送ローラ
ー41は弾性体であり、加圧ローラー42は剛体であ
る。この構成では加圧ローラー側が歪んでしまい正確に
紙厚を検知する事ができない。
Now, in order to pass the paper of various thicknesses through the image forming apparatus, as shown in FIG.
A pull-out roller pair is placed in front of the. It is composed of a conveyance roller 41 and a pressure roller 42. Usually, the conveyance roller 41 is an elastic body and the pressure roller 42 is a rigid body. With this configuration, the pressure roller side is distorted and the paper thickness cannot be accurately detected.

【0029】そこで図5に示すように搬送ローラーを弾
性体と剛体の複合した構成をとる。図4の通常搬送ロー
ラーに相当するローラーを長手方向に3分割し、両側の
51は剛体、例えば金属もしくは剛性の高いポリアセタ
ール(POM)の様な樹脂で形成し、中央部分52は摩
擦係数が高いエチレンプロピレン系樹脂(EPDM)や
クロロプレン(CR)ゴムの様な弾性体で形成する。
Therefore, as shown in FIG. 5, the conveying roller is constructed by combining an elastic body and a rigid body. A roller corresponding to the normal conveying roller in FIG. 4 is divided into three parts in the longitudinal direction, 51 on both sides is made of a rigid body, for example, metal or resin such as highly rigid polyacetal (POM), and the central portion 52 has a high friction coefficient. It is made of an elastic material such as ethylene propylene resin (EPDM) or chloroprene (CR) rubber.

【0030】弾性部52の径は、剛体部51の径より微
少に大きくしてあるが、搬送ローラー対42、50間に
付与される搬送狭持圧により弾性変形し、ローラー対4
2、50間の距離はローラー42の金属部とローラー5
0の剛性部51が接触し保証されるように弾性部52の
径及びその弾性度が設定されている。また弾性部52の
長手方向の巾は最小巾の記録材巾より狭く設定してあ
る。すなわち最小巾紙がB5サイズあれば用紙巾182
mmに対し、142mmに設定されており、B5サイズ
紙がローラー42、50に狭持搬送される際、その両端
共20mmずつ、剛性部51に挾持される。
Although the diameter of the elastic portion 52 is slightly larger than the diameter of the rigid portion 51, it is elastically deformed by the conveying nip pressure applied between the conveying roller pairs 42 and 50, and the roller pair 4 is rotated.
The distance between 2 and 50 is the metal part of the roller 42 and the roller 5.
The diameter and the elasticity of the elastic portion 52 are set so that the rigid portion 51 of 0 is in contact with and guaranteed. The width of the elastic portion 52 in the longitudinal direction is set to be narrower than the minimum width of the recording material. That is, if the minimum paper width is B5 size, paper width 182
It is set to 142 mm with respect to mm, and when the B5 size paper is nipped and conveyed by the rollers 42 and 50, both ends thereof are held by the rigid portion 51 by 20 mm.

【0031】従って、通紙基準に対し、両端均等にしか
も長いスパンで記録紙を挾持されるため、ローラー42
は傾き等なく、紙厚分を正確に移動せしめることができ
る。また記録紙搬送のための機能を記録紙の中央部に設
けたため、搬送ローラー対42、50の長手方向の圧バ
ランスの影響を受けにくく、安定した記録紙搬送を行う
ことができる。
Therefore, the recording paper is held evenly at both ends with respect to the paper passing standard and with a long span.
Can move the paper thickness accurately without tilting. Further, since the function of conveying the recording paper is provided in the central portion of the recording paper, the recording paper can be stably conveyed without being affected by the pressure balance in the longitudinal direction of the conveying rollers 42, 50.

【0032】[0032]

【発明の効果】以上説明したように、本発明によれば、
記録材を狭持時回転体をその厚さとほぼ1対1で変位せ
しめることが可能で、正確な厚さを検知することができ
る。
As described above, according to the present invention,
When the recording material is held, it is possible to displace the rotator approximately one-to-one with its thickness, and it is possible to detect the accurate thickness.

【0033】また、弾性部を前記回転体の中央部に配置
したことにより、シートの狭持不良、及びシートの斜行
等を起こしにくく高精度な紙搬送をも合せて行うことが
できる。
Further, by disposing the elastic portion at the central portion of the rotating body, it is possible to carry out highly accurate sheet conveyance which is less likely to cause the sheet to be pinched or skewed.

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

【図1】本発明を最も良く表す画像形成装置の記録材の
厚さ検出部の斜視図である。
FIG. 1 is a perspective view of a recording material thickness detection unit of an image forming apparatus that best represents the present invention.

【図2】実施例の動作を表すフローチャートである。FIG. 2 is a flowchart showing the operation of the embodiment.

【図3】センサの出力波形を示す図である。FIG. 3 is a diagram showing an output waveform of a sensor.

【図4】従来の構成を示す図である。FIG. 4 is a diagram showing a conventional configuration.

【図5】実施例2を表す概略図である。FIG. 5 is a schematic diagram illustrating a second embodiment.

【符号の説明】[Explanation of symbols]

1 搬送ローラー 2 加圧ローラー 3 歯車 4 歯車 7 バネ 8 フォトセンサ 9 中央演算装置(CPU) 10 フォトセンサ 14 ベアリング 1 Transport Roller 2 Pressure Roller 3 Gear 4 Gear 7 Spring 8 Photo Sensor 9 Central Processing Unit (CPU) 10 Photo Sensor 14 Bearing

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B65H 43/08 G03G 15/01 114 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B65H 43/08 G03G 15/01 114

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 シートを搬送及び挾持する回転体対と、
前記回転体対の軸間距離を検知する検知手段を有するシ
ート厚検出装置において、前記回転体対の一方の回転体
の長手方向の中央部が最小シート巾より狭い弾性部材に
て形成され、その両側が剛性部材より形成されているこ
とを特徴とするシート厚検知装置。
1. A pair of rotating bodies for conveying and holding a sheet,
In a sheet thickness detecting device having a detecting means for detecting an axial distance between the pair of rotating bodies, a central portion in the longitudinal direction of one rotating body of the pair of rotating bodies is formed of an elastic member narrower than a minimum sheet width. A sheet thickness detecting device characterized in that both sides are formed of rigid members.
【請求項2】 前記弾性部材はその径が前記剛性部材の
径より大きく、摩擦係数が大きい材質によりなることを
特徴とする請求項第1項記載のシート厚検知装置。
2. The sheet thickness detecting device according to claim 1, wherein the elastic member is made of a material having a diameter larger than that of the rigid member and having a large friction coefficient.
JP200095A 1995-01-10 1995-01-10 Paper thickness detecting device Withdrawn JPH08188297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP200095A JPH08188297A (en) 1995-01-10 1995-01-10 Paper thickness detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP200095A JPH08188297A (en) 1995-01-10 1995-01-10 Paper thickness detecting device

Publications (1)

Publication Number Publication Date
JPH08188297A true JPH08188297A (en) 1996-07-23

Family

ID=11517168

Family Applications (1)

Application Number Title Priority Date Filing Date
JP200095A Withdrawn JPH08188297A (en) 1995-01-10 1995-01-10 Paper thickness detecting device

Country Status (1)

Country Link
JP (1) JPH08188297A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110235063A (en) * 2017-01-31 2019-09-13 兄弟工业株式会社 Delevoping cartridge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110235063A (en) * 2017-01-31 2019-09-13 兄弟工业株式会社 Delevoping cartridge
US11073785B2 (en) 2017-01-31 2021-07-27 Brother Kogyo Kabushiki Kaisha Developing cartridge including supply roller, layer thickness regulation blade, and supply electrode electrically connected to both supply roller and layer thickness regulation blade
US11733643B2 (en) 2017-01-31 2023-08-22 Brother Kogyo Kabushiki Kaisha Developing cartridge including supply roller, layer thickness regulation blade, and supply electrode electrically connected to both supply roller and layer thickness regulation blade

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