JPH05297737A - Transfer material carrying device for image forming device - Google Patents
Transfer material carrying device for image forming deviceInfo
- Publication number
- JPH05297737A JPH05297737A JP4125419A JP12541992A JPH05297737A JP H05297737 A JPH05297737 A JP H05297737A JP 4125419 A JP4125419 A JP 4125419A JP 12541992 A JP12541992 A JP 12541992A JP H05297737 A JPH05297737 A JP H05297737A
- Authority
- JP
- Japan
- Prior art keywords
- belt member
- signal
- speed
- seam
- roll
- 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
- Color Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Paper Feeding For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Advancing Webs (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機等の画像形成装
置において用紙等の転写材を搬送する搬送装置に係り、
詳細には転写材の搬送速度を正確に制御するための改良
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for transferring a transfer material such as paper in an image forming apparatus such as a copying machine,
More specifically, it relates to an improvement for accurately controlling the transfer material conveyance speed.
【０００２】[0002]
【従来の技術】一般に、カラー電子写真複写機では、マ
ゼンタ、シアン、イエロー等の複数色のトナー像(可視
像)を記録シートに多重転写してカラー画像を形成して
いる。特に近年では画像形成速度の向上を図ることを目
的とし、複写機内における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試みがなされている。2. Description of the Related Art Generally, in a color electrophotographic copying machine, a toner image (visible image) of a plurality of colors such as magenta, cyan and yellow is multi-transferred onto a recording sheet to form a color image. Particularly in recent years, for the purpose of improving the image forming speed, a toner image forming unit including a photosensitive drum and a developing device for each color is provided and conveyed along the conveyance path of the recording sheet in the copying machine. Attempts have been made to continuously transfer toner images of multiple colors onto the recording sheet.
【０００３】この場合、記録シートは複数のトナー像形
成部にまたがって安定して搬送される必要があり、その
搬送手段としては外周面に記録シートを吸着して回動す
る無端状のベルト部材が用いられている。In this case, the recording sheet needs to be stably conveyed over a plurality of toner image forming portions, and as its conveying means, an endless belt member which adsorbs the recording sheet on its outer peripheral surface and rotates. Is used.
【０００４】既に説明したようにカラー電子写真複写機
では、複数色のトナー像を記録シートに多重転写してカ
ラー画像の形成を行っているので、先に転写したトナー
像の転写位置と後に転写したトナー像の転写位置とが記
録シート上で正確に一致しなければならない。仮に一致
しないとすれば、完成したカラー画像には色ズレが発生
したり、線の太さが不均一になる等の画質欠陥が生じ
る。従って、画質欠陥の無い高品位なカラー画像を形成
するためには、記録シートを搬送するベルト部材が常に
一定の周速で回動していることが重要である。しかし、
実際にはベルト部材を張架するロールが真円でなかった
り、ベルト部材を回動させる駆動モータに回転ムラが存
在する等の理由から、ベルト部材の周速を完全に一定に
保つことは実質的に不可能である。As described above, in a color electrophotographic copying machine, a toner image of a plurality of colors is transferred onto a recording sheet in a multiple transfer manner to form a color image. Therefore, the transfer position of the toner image transferred first and the transfer position of the toner image transferred later are transferred. The transfer position of the formed toner image must exactly match on the recording sheet. If they do not match, a color error will occur in the completed color image, and image defects such as non-uniform line thickness will occur. Therefore, in order to form a high quality color image having no image quality defect, it is important that the belt member that conveys the recording sheet always rotates at a constant peripheral speed. But,
In practice, it is practically impossible to keep the peripheral speed of the belt member completely constant because the roll that stretches the belt member is not a perfect circle, or the drive motor that rotates the belt member has uneven rotation. Is impossible.
【０００５】そこで、従来はベルト部材の周速を検出す
る速度検出手段を設け、検出したベルト部材の周速に基
づいて駆動モータの回転数を制御している。Therefore, conventionally, speed detecting means for detecting the peripheral speed of the belt member is provided, and the rotational speed of the drive motor is controlled based on the detected peripheral speed of the belt member.
【０００６】この速度検出手段はベルト部材に当接して
これに連れ回される速度検出ロールと、この検出ロール
の回転数に基づいて速度検出信号を出力するロータリー
エンコーダとから構成されている。また、図9に示すよ
うに、ベルト部材6を挟んで上記速度検出ロール61と対
向する位置にはベルト部材6に向けて付勢された対向ロ
ール62が設けられ、ベルト部材6を検出ロール61に押し
つけて両者がスリップするのを防止している。The speed detecting means is composed of a speed detecting roll which abuts on the belt member and is rotated together with the belt member, and a rotary encoder which outputs a speed detecting signal based on the number of rotations of the detecting roll. Further, as shown in FIG. 9, an opposing roll 62 biased toward the belt member 6 is provided at a position opposed to the speed detection roll 61 with the belt member 6 interposed therebetween, and the belt member 6 is detected by the detection roll 61. It prevents it from slipping by pressing it against.
【０００７】上記ロータリーエンコーダは、例えば、上
記検出ロールの回転軸に取り付けられたディスクと、こ
のディスクに記されたマークを読み取るフォトセンサと
から構成される。この場合に上記速度検出信号は、検出
ロールの回転数、すなわちベルト部材の周速に応じて出
力間隔の異なるパルス信号として出力される。図10は、
ロータリーエンコーダから出力される速度検出信号に基
づいて駆動モータの回転数を制御する従来の手法を示す
ブロック図である。エンコーダから出力された速度検出
信号は先ずデータ演算回路に入力される。データ演算回
路では予め格納されていた基準速度信号と上記速度検出
信号との比較がなされる。ここで上記基準速度信号は、
目標値として設定されたベルト部材の周速に基づいて決
定されている。そして、データ演算回路は上記比較結果
から、ベルト部材の周速が目標とする周速より速いのか
又は遅いのかを出力し、これを受けたドライバ回路が駆
動モータの回転数の増減を行っていた。The rotary encoder comprises, for example, a disk mounted on the rotary shaft of the detection roll and a photosensor for reading the mark written on the disk. In this case, the speed detection signal is output as a pulse signal having a different output interval according to the rotation speed of the detection roll, that is, the peripheral speed of the belt member. Figure 10
It is a block diagram which shows the conventional method of controlling the rotation speed of a drive motor based on the speed detection signal output from a rotary encoder. The speed detection signal output from the encoder is first input to the data arithmetic circuit. The data arithmetic circuit compares the previously stored reference speed signal with the speed detection signal. Here, the reference speed signal is
It is determined based on the peripheral speed of the belt member set as the target value. Then, the data arithmetic circuit outputs from the comparison result whether the peripheral speed of the belt member is faster or slower than the target peripheral speed, and the driver circuit receiving this outputs the rotational speed of the drive motor to increase or decrease. ..
【０００８】[0008]
【発明が解決しようとする課題】ところで、上記ベルト
部材は両端を継いで無端状に形成されているので、ベル
トの継ぎ目が上記検出ロールと対向ロールとの間に突入
すると、検出ロールがこの継ぎ目を乗り越える際の衝撃
力がロータリーエンコーダに伝達され、ロータリーエン
コーダが検出ロールの回転数とは無関係な速度検出信号
を出力してしまうことがある。このために前記従来の制
御方法では、ベルト部材の周速が目標値と略合致してい
る場合であっても、ベルト部材の継ぎ目が検出ロールを
通過すると、ベルト部材の周速が目標値よりも速いある
いは遅いと判断され、ベルト部材の周速を適確に制御す
ることが出来なかった。By the way, since the belt member is formed in an endless manner by joining both ends, when the belt seam penetrates between the detection roll and the opposing roll, the detection roll is joined by the seam. There is a case where the impact force at the time of getting over the vehicle is transmitted to the rotary encoder, and the rotary encoder outputs a speed detection signal irrelevant to the rotation speed of the detection roll. Therefore, in the conventional control method, even when the peripheral speed of the belt member substantially matches the target value, when the seam of the belt member passes through the detection roll, the peripheral speed of the belt member becomes lower than the target value. Was judged to be fast or slow, and the peripheral speed of the belt member could not be controlled appropriately.
【０００９】また、前記継ぎ目が検出ロールと対向ロー
ルとの間に突入する際の衝撃はベルト部材自体にも伝達
される。このため、記録シートにトナー像が転写される
タイミングに同期して上記衝撃がベルト部材に伝達され
ると、記録シートに転写されたトナー像が歪んだり、転
写抜けが発生すると言った問題点もあった。Further, the impact when the seam plunges between the detection roll and the opposing roll is also transmitted to the belt member itself. Therefore, when the impact is transmitted to the belt member in synchronism with the timing at which the toner image is transferred to the recording sheet, the toner image transferred to the recording sheet may be distorted or the transfer omission may occur. there were.
【００１０】本発明はこのような問題点に鑑みなされた
ものであり、その第一の目的とするところは、ベルト部
材の継ぎ目がベルト部材の周速の制御に及ぼす影響を排
除し、ベルト部材の周速を適確に制御することが可能な
転写材搬送装置を提供することにある。また、第二の目
的は、速度検出ロールがベルト部材を乗り越える際の衝
撃を和らげ、記録シートを常に滑らかに搬送することが
可能な転写材搬送装置を提供することにある。The present invention has been made in view of the above problems. A first object of the present invention is to eliminate the influence of the seam of the belt member on the control of the peripheral speed of the belt member, It is an object of the present invention to provide a transfer material conveying device capable of appropriately controlling the peripheral speed of. A second object of the present invention is to provide a transfer material transporting device capable of softening the impact when the speed detecting roll passes over the belt member and always transporting the recording sheet smoothly.
【００１１】[0011]
【課題を解決するための手段】上記第一の目的を達成す
るために、本発明の転写材搬送装置は、両端を互いに継
いで無端状に形成され用紙等の転写材を担持して搬送す
るベルト部材と、このベルト部材に当接して連れ回され
る速度検出ロールを有し上記ベルト部材の周速Vに応じ
た検知速度信号を出力する速度検出手段と、上記検知速
度信号を予め定められた基準速度信号と比較し、その比
較結果に基づいて上記ベルト部材の駆動モータを制御す
る制御手段とを備えた転写材搬送装置において、上記ベ
ルト部材の継目を検知する継目検知センサーを有すると
共に検知した継目が上記速度検出ロールを通過するタイ
ミングを示す継目通過信号を出力する継目検知手段を設
け、且つ、上記継目通過信号の入力時に上記検知速度信
号を継目通過信号入力前の検知速度信号若しくは上記基
準速度信号に置き換える信号置換手段を設けたことを特
徴とするものである。In order to achieve the first object, the transfer material conveying device of the present invention carries and transfers a transfer material such as a sheet which is formed in an endless manner by joining both ends to each other. A belt member, a speed detection unit that has a speed detection roll that comes into contact with the belt member and is rotated together with the belt member, and outputs a detection speed signal according to the peripheral speed V of the belt member; and the detection speed signal is predetermined. And a reference speed signal, and a transfer material conveying device having control means for controlling the drive motor of the belt member based on the comparison result, and having and detecting a seam detecting sensor for detecting the seam of the belt member. Is provided with a seam detection means for outputting a seam passage signal indicating the timing at which the seam passes the speed detection roll, and the detected speed signal is input when the seam passage signal is input. It is characterized in that a signal replacing means for replacing the detected speed signal before force or the reference speed signal is provided.
【００１２】又、上記第二の目的を達成する本発明の転
写材搬送装置は、ベルト部材に当接する速度検出ロール
若しくはこれと相俟ってベルト部材を挟み込む対向ロー
ルを、上記継目通過信号の入力に基づいてベルト部材か
ら離間させる解除手段を設けたことを特徴とするもので
ある。Further, in the transfer material conveying apparatus of the present invention which achieves the above second object, the speed detection roll contacting the belt member or the counter roll sandwiching the belt member together with the speed detection roll is provided with the above-mentioned seam passage signal. It is characterized in that a release means for separating from the belt member based on the input is provided.
【００１３】[0013]
【作用】ベルト部材の継ぎ目が速度検出ロールを通過す
る際には、速度検出手段から出力された検知速度信号は
ベルト部材の周速を正確に反映していない場合が多々あ
る。しかし上記技術的手段によれば、ベルト部材の継ぎ
目が速度検出ロールを通過する際の検知速度信号は信号
置換手段によって破棄され、信号置換手段は破棄した検
知速度信号の代わりにその直前の検知速度信号若しくは
基準速度信号を出力する。従って、ベルト部材の継ぎ目
が速度検出ロールを通過する際の誤った検知速度信号に
よって、ベルト部材の周速が大きく変動することがな
く、ベルト部材の周速を適確に制御することができる。When the seam of the belt member passes through the speed detecting roll, the detected speed signal output from the speed detecting means often does not accurately reflect the peripheral speed of the belt member. However, according to the above technical means, the detected speed signal when the seam of the belt member passes the speed detection roll is discarded by the signal replacement means, and the signal replacement means replaces the discarded detected speed signal with the immediately preceding detected speed signal. Output signal or reference speed signal. Therefore, the peripheral speed of the belt member does not significantly change due to an erroneously detected speed signal when the seam of the belt member passes through the speed detection roll, and the peripheral speed of the belt member can be controlled appropriately.
【００１４】また、第二の技術的手段によれば、ベルト
部材の継ぎ目が速度検出ロールを通過する際に、速度検
出ロール若しくはベルト部材の裏面側に当接する対向ロ
ールがベルト部材から離間するので、これらロールがベ
ルト部材の継ぎ目を乗り越える時にベルト部材に衝撃が
加わることがない。従って、ベルト部材は常に円滑に回
動し、記録シートの搬送を安定して行うことができる。Further, according to the second technical means, when the seam of the belt member passes through the speed detecting roll, the speed detecting roll or the opposing roll abutting against the back side of the belt member is separated from the belt member. Therefore, no impact is applied to the belt member when these rolls pass over the seam of the belt member. Therefore, the belt member always rotates smoothly, and the recording sheet can be stably conveyed.
【００１５】[0015]
【実施例】以下、添付図面に基づいて本発明の転写材搬
送装置を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The transfer material conveying device of the present invention will be described in detail below with reference to the accompanying drawings.
【００１６】図1及び図2は本発明の第一実施例を示すも
のである。符号1は両端を継いで無端状に形成したベル
ト部材であり、厚さ0.075mmのPETから形成されている。
このベルト部材1は、駆動モータ11が接続された駆動ロ
ール12、ベルト部材1に連れ回されて回転する従動ロー
ル13及びベルト部材1の張り具合を調整する張力調整ロ
ール14に掛け回されている。上記張力調整ロール14はバ
ネ部材15によってベルト部材1の内周側から外周側に向
かって付勢されており、ベルト部材1を常に所定の張力
で張架している。そして、これらロール12,13,14はベル
ト部材の両側に配設されるフレーム(図示せず)に支持さ
れている。1 and 2 show a first embodiment of the present invention. Reference numeral 1 is a belt member formed by joining both ends and forming an endless shape, and is made of PET having a thickness of 0.075 mm.
The belt member 1 is wound around a drive roll 12 to which a drive motor 11 is connected, a driven roll 13 that is rotated by being rotated by the belt member 1, and a tension adjusting roll 14 that adjusts the tension of the belt member 1. .. The tension adjusting roll 14 is biased by the spring member 15 from the inner peripheral side to the outer peripheral side of the belt member 1, and always stretches the belt member 1 with a predetermined tension. The rolls 12, 13, 14 are supported by frames (not shown) arranged on both sides of the belt member.
【００１７】また、符号2は上記ベルト部材1の周速を検
出する速度検出手段を示している。この速度検出手段2
は、上記ベルト部材1に当接する速度検出ロール21と、
この速度検出ロール21の回転軸22に接続されたロータリ
ーエンコーダ23とから構成されている。上記速度検出ロ
ールは上記フレームに回転自在に支持されており、ベル
ト部材の回動によって連れ回される。また、ベルト部材
1を挟んで上記速度検出ロール21と対向する位置には、
バネ部材24でベルト部材1に向けて付勢された対向ロー
ル25が配設されており、ベルト部材と速度検出ロールと
の間に作用する摩擦力を高める働きをする。これにより
速度検出ロールがベルト部材に対してスリップせず、常
にベルト部材の周速に応じた回転数を与えられる。Reference numeral 2 indicates a speed detecting means for detecting the peripheral speed of the belt member 1. This speed detection means 2
Is a speed detection roll 21 contacting the belt member 1,
The rotary encoder 23 is connected to the rotary shaft 22 of the speed detecting roll 21. The speed detecting roll is rotatably supported by the frame and is rotated by the rotation of the belt member. Also, belt members
At a position facing the speed detection roll 21 with the 1 in between,
An opposed roll 25, which is biased toward the belt member 1 by a spring member 24, is provided, and serves to increase the frictional force acting between the belt member and the speed detection roll. As a result, the speed detecting roll does not slip with respect to the belt member, and the rotation speed according to the peripheral speed of the belt member is always given.
【００１８】一方、上記ロータリーエンコーダは速度検
出ロールの回転数に応じた検知速度信号を出力する。こ
の検知速度信号は、速度検出ロールの回転数に応じて間
隔の異なる複数のタイミングパルスとして出力される。
速度検出ロールの回転数が高い場合にはタイミングパル
スの出力間隔は短くなり、回転数が低い場合には出力間
隔は長くなる。従って、単位時間当たりの出力パルス数
をカウントすればベルト部材の速度を検知することがで
きる。このロータリーエンコーダとしては、例えば、HE
DS5500GR(YHP製)を使用することができる。On the other hand, the rotary encoder outputs a detected speed signal according to the number of rotations of the speed detecting roll. The detected speed signal is output as a plurality of timing pulses having different intervals according to the rotation speed of the speed detection roll.
When the rotation speed of the speed detection roll is high, the output interval of the timing pulse becomes short, and when the rotation speed is low, the output interval becomes long. Therefore, the speed of the belt member can be detected by counting the number of output pulses per unit time. As this rotary encoder, for example, HE
DS5500GR (made by YHP) can be used.
【００１９】次に、符号3はベルト部材の継ぎ目を検知
する継ぎ目検知手段を示している。この継ぎ目検知手段
3は、ベルト部材1の継ぎ目16の上に印刷された検知マー
ク31と、速度検出ロール21より僅かにベルト搬送方向の
上流側に配設された継目検知センサー32と、ベルト部材
1の継ぎ目16が速度検出ロール21を通過するタイミング
を演算して継目通過信号を出力するタイミング演算回路
とから構成されている。Next, reference numeral 3 indicates a seam detecting means for detecting the seam of the belt member. This seam detection means
3 is a detection mark 31 printed on the seam 16 of the belt member 1, a seam detection sensor 32 arranged slightly upstream of the speed detection roll 21 in the belt conveyance direction, and a belt member.
The first seam 16 is composed of a timing calculation circuit that calculates the timing at which the seam 16 passes through the speed detection roll 21 and outputs a seam passage signal.
【００２０】図3に示すように、上記検知マーク31はベ
ルト部材1の継ぎ目16の上で、且つ、継目検知センサー3
2の読み取り領域32aを通過する位置に印刷されており、
継目検知センサー32はこの検知マーク31を光学的に読み
取る。そして、検知マーク31が読み取り領域32aを通過
した時にだけ、継目検知信号を上記タイミング演算回路
に出力する。尚、ベルト部材1の継ぎ目16を検知する手
段は、このような光学的方法以外に、ベルト部材に直接
接触して検知する機械的な方法であって差し支えない。
具体的にはベルト部材の表面に検知ローラを当接させ、
この検知ローラがベルト部材の継ぎ目を乗り越える際に
継目検知信号を出力するように構成することができる
(特開昭60-97367号公報参照)。As shown in FIG. 3, the detection mark 31 is on the joint 16 of the belt member 1 and the joint detection sensor 3
It is printed at a position that passes through the reading area 32a of 2.
The seam detection sensor 32 optically reads the detection mark 31. Then, only when the detection mark 31 passes through the reading area 32a, the joint detection signal is output to the timing calculation circuit. The means for detecting the seam 16 of the belt member 1 may be a mechanical method of detecting the seam 16 by directly contacting the belt member, other than such an optical method.
Specifically, the detection roller is brought into contact with the surface of the belt member,
The detection roller can be configured to output a seam detection signal when it crosses over the seam of the belt member.
(See JP-A-60-97367).
【００２１】上記タイミング演算回路は、上記継目検知
信号の入力に基づいて継ぎ目が速度検出ロールを通過す
るタイミングを演算し、このタイミングに合わせて継目
通過信号を出力する。しかし、実際には継ぎ目が速度検
出ロールを通過するタイミングの前後に±0.05(s)の余
裕を持たせ、ある一定の時間幅だけ継ぎ目通過信号を出
力している。継ぎ目16が速度検出ロール21を通過するタ
イミングは、ベルト部材1の周速V(m/s)及び速度検出ロ
ール21と継目検知センサー32との距離L(m)から算出され
る(図5参照)。すなわち、継目検知センサー32が検知マ
ーク31を読み取ってからL/V(s)後が通過タイミングであ
る。従って、このタイミング演算回路から継目通過信号
が出力される時間は、継目検知センサー32が検知マーク
31を読み取った後、L/V-0.05からL/V+0.05(s)迄の間で
ある。The timing calculation circuit calculates the timing at which the seam passes the speed detection roll based on the input of the seam detection signal, and outputs the seam passage signal in accordance with this timing. However, actually, a margin of ± 0.05 (s) is provided before and after the timing at which the seam passes the speed detection roll, and the seam passage signal is output for a certain fixed time width. The timing at which the seam 16 passes through the speed detection roll 21 is calculated from the peripheral speed V (m / s) of the belt member 1 and the distance L (m) between the speed detection roll 21 and the seam detection sensor 32 (see FIG. 5). ). That is, the passage timing is L / V (s) after the joint detection sensor 32 reads the detection mark 31. Therefore, the time when the seam passage signal is output from this timing calculation circuit
After reading 31, it is between L / V-0.05 and L / V + 0.05 (s).
【００２２】また、速度検出ロール21と継目検知センサ
ー32との距離L(m)を短く設定する場合には、図7に示す
ように検知マーク33をベルト部材1の継ぎ目16よりも長
く形成しておき、継目検知センサー32が検知マーク33を
読み取っている間は継目通過信号を出力するように設定
しても良い。このときの検知マーク33の長さは、継ぎ目
16が継目検知センサー32を通過してから速度検出ロール
21を完全に通過し終える迄の時間分である。このように
構成すれば、上記タイミング演算回路を簡略化すめるこ
とができる。When the distance L (m) between the speed detecting roll 21 and the joint detecting sensor 32 is set to be short, the detecting mark 33 is formed longer than the joint 16 of the belt member 1 as shown in FIG. The seam detection sensor 32 may be set to output a seam passage signal while the detection mark 33 is being read. At this time, the length of the detection mark 33 is
After 16 passes the joint detection sensor 32, speed detection roll
It's the time it takes to completely pass 21. With this configuration, the timing calculation circuit can be simplified.
【００２３】図4はこの転写材搬送装置におけるベルト
部材1の周速の制御を示すブロック図である。既に説明
したように、エンコーダ23からはその時のベルト部材1
の周速を示す検知速度信号が出力される一方、タイミン
グ演算回路からはベルト部材1の継ぎ目16が速度検出ロ
ール21を通過するタイミングを示す継目通過信号が出力
されている。これら検知速度信号及び継目通過信号は信
号置換手段に入力される。上記信号置換手段は、継目通
過信号の入力の有無に応じて異なる2つの信号をデータ
演算回路へ出力する。すなわち、継目通過信号の入力が
無いときは、エンコーダ23から入力した検知速度信号を
そのままデータ演算回路へ出力し、また、継目通過信号
が入力されている間は、継目通過信号が入力するまで出
力していた検知速度信号をそのまま出力し続けるのであ
る。FIG. 4 is a block diagram showing the control of the peripheral speed of the belt member 1 in this transfer material conveying device. As described above, from the encoder 23, the belt member 1 at that time is
While the detected speed signal indicating the peripheral speed is output, the timing calculation circuit outputs the seam passage signal indicating the timing at which the seam 16 of the belt member 1 passes the speed detection roll 21. The detected speed signal and the seam passage signal are input to the signal replacement means. The signal replacement means outputs two signals that differ depending on whether or not a seam passage signal is input to the data operation circuit. That is, when the seam passage signal is not input, the detected speed signal input from the encoder 23 is directly output to the data arithmetic circuit, and while the seam passage signal is being input, it is output until the seam passage signal is input. It continues to output the detected speed signal as it is.
【００２４】図6は、信号置換手段から出力される信
号、エンコーダ23からの速度検知信号及びタイミング演
算回路からの継ぎ目通過信号の関係を示すタイミングチ
ャートである。ここで速度検知信号のタイミングパルス
の間隔が定期的に乱れているのは、速度検出ロール21が
ベルト部材1の継ぎ目16を乗り越える際の衝撃がエンコ
ーダ23に伝達され、エンコーダ23が一時的な作動不良を
起こすためである。このとき信号置換手段には、ベルト
部材1の継ぎ目16が速度検出ロール21を通過するタイミ
ングを含む時間帯t1〜t2、t3〜t4、t5〜t6で継目通過信
号が入力されている。従って、時間帯t1〜t2を例にとる
と、信号置換手段はt1〜t2において実際の検知速度信号
を出力せず、時間t1以前の検知速度信号をそのまま出力
し続ける。また、時間t2以降は継目通過信号が入力され
ないので、信号置換手段はその時に入力されている検知
速度信号をそのまま出力する。以降は時間帯t3〜t4、t5
〜t6についてもこれと同じ動作を繰り返す。FIG. 6 is a timing chart showing the relationship among the signal output from the signal replacing means, the speed detection signal from the encoder 23, and the seam passage signal from the timing calculation circuit. Here, the interval of the timing pulse of the speed detection signal is regularly disturbed because the impact when the speed detection roll 21 passes over the joint 16 of the belt member 1 is transmitted to the encoder 23, and the encoder 23 temporarily operates. This is because it causes defects. At this time, the seam passage signal is input to the signal replacement means at time zones t 1 to t 2 , t 3 to t 4 , and t 5 to t 6 including the timing at which the seam 16 of the belt member 1 passes through the speed detection roll 21. Has been done. Therefore, taking the time zones t 1 to t 2 as an example, the signal replacement means does not output the actual detection speed signal in t 1 to t 2 , but continues to output the detection speed signal before the time t 1 . The time t 2 later so seam passing signal is not input, the signal replacement means directly outputs the detection speed signal being input at that time. After that time zone t 3 to t 4 , t 5
The same operation is repeated for ~ t 6 .
【００２５】これにより信号置換手段の出力信号は、ベ
ルト部材1の継ぎ目16の影響を取り除いて安定したもの
となる。また、上記時間帯t1〜t2におけるベルト部材の
実際の周速は時間t1直前の周速と大差はないと考えられ
るので、上記のように時間帯t1〜t2における検知速度信
号を擬制しても何ら問題はない。従って、この実施例で
はベルト部材の周速に適確に対応した検知速度信号を次
のデータ演算回路へ入力することができる。As a result, the output signal of the signal replacing means becomes stable by removing the influence of the joint 16 of the belt member 1. Further, since it is considered that the actual peripheral speed of the belt member in the time zones t 1 to t 2 is not significantly different from the peripheral speed immediately before the time t 1, the detected speed signal in the time zones t 1 to t 2 is as described above. There is no problem if you pretend to be. Therefore, in this embodiment, it is possible to input the detected speed signal, which corresponds to the peripheral speed of the belt member, to the next data arithmetic circuit.
【００２６】このようにして信号置換手段で安定化され
た検知速度信号はデータ演算回路に入力され、目標とな
るベルト部材1の周速から決定された基準速度信号と比
較される。両信号の比較は、単位時間当たりに含まれる
タイミングパルスの数を比べて行われる。すなわち、検
知速度信号のタイミングパルスの数が基準速度信号より
少ないときは、ベルト部材1の周速が目標の周速よりも
遅いと判断される。また、検知速度信号のタイミングパ
ルスの数が基準速度信号より多いときは、ベルト部材1
の周速が目標の周速よりも速いと判断される。そして、
この結果に基づきドライバ回路に駆動モータ11の増速あ
るいは減速が指令される。The detected speed signal thus stabilized by the signal replacing means is input to the data calculation circuit and compared with the reference speed signal determined from the target peripheral speed of the belt member 1. The comparison of both signals is performed by comparing the number of timing pulses included per unit time. That is, when the number of timing pulses of the detected speed signal is smaller than the reference speed signal, it is determined that the peripheral speed of the belt member 1 is slower than the target peripheral speed. If the number of timing pulses in the detected speed signal is greater than the reference speed signal, the belt member 1
It is judged that the peripheral speed of is faster than the target peripheral speed. And
Based on this result, the driver circuit is instructed to accelerate or decelerate the drive motor 11.
【００２７】このとき本実施例では、ベルト部材1の継
ぎ目16の影響を取り除いて安定化した検知速度信号が基
準速度信号と比較されるので、データ演算回路がベルト
部材1の周速の判断を誤ることがない。従って、ベルト
部材1の周速を適確に制御することが可能となる。At this time, in this embodiment, since the detected speed signal stabilized by removing the influence of the joint 16 of the belt member 1 is compared with the reference speed signal, the data arithmetic circuit determines the peripheral speed of the belt member 1. There is no mistake. Therefore, the peripheral speed of the belt member 1 can be controlled appropriately.
【００２８】尚、この実施例において上記信号置換手段
では、時間帯t1〜t2における出力信号を時間t1の直前に
入力された検知速度信号に置き換えていたが、この時間
帯における出力信号を予め用意された基準速度信号とし
ても差し支えない。このように検知速度信号を置き換え
ると、時間帯t1〜t2におけるベルト部材1の周速は制御
目標とする周速に合致していることになるので、この時
間帯におけるベルト部材1の周速は何ら修正されない。In this embodiment, the signal replacing means replaces the output signal in the time zone t1 to t2 with the detected speed signal input immediately before the time t1, but the output signal in this time zone is prepared in advance. It may be used as the reference speed signal. When the detected speed signal is replaced in this way, the peripheral speed of the belt member 1 in the time zones t1 to t2 matches the peripheral speed that is the control target, so the peripheral speed of the belt member 1 in this time zone is No fix.
【００２９】次に、図8は、ベルト部材1の継ぎ目16が速
度検出ロール21を通過するタイミングに合わせて、対向
ロール25をベルト部材1から離間させる構成を示してい
る。対向ロール25の回転軸26はフレーム5に固定された
バネ部材24によってベルト部材1の方向へ付勢されてい
る。また、その一方で、上記回転軸26には対向ロール25
をベルト部材1から離間させる対向ロール解除手段4が接
続されている。この実施例において上記対向ロール解除
手段4は電磁ソレノイドである。この電磁ソレノイド4は
上記タイミング演算回路から出力される継目通過信号の
入力に合わせて駆動される(図4参照)。すなわち、継目
通過信号が入力されると、バネ部材24に抗して回転軸26
を引き下げ、対向ロール25をベルト部材1から離間させ
る。また、継目通過信号が絶たれると、引張力を発生し
ないフリー状態となり、対向ロール25はバネ部材24の付
勢力によってベルト部材1に圧接する。Next, FIG. 8 shows a structure in which the opposing roll 25 is separated from the belt member 1 at the timing when the joint 16 of the belt member 1 passes through the speed detecting roll 21. The rotating shaft 26 of the opposed roll 25 is biased toward the belt member 1 by a spring member 24 fixed to the frame 5. On the other hand, on the other hand, the rotating shaft 26 is provided with an opposing roll 25.
Opposed roll releasing means 4 for separating the belt from the belt member 1 is connected. In this embodiment, the opposed roll releasing means 4 is an electromagnetic solenoid. The electromagnetic solenoid 4 is driven according to the input of the joint passage signal output from the timing calculation circuit (see FIG. 4). That is, when the seam passage signal is input, the rotary shaft 26 is resisted against the spring member 24.
Is pulled down to separate the opposed roll 25 from the belt member 1. Further, when the seam passage signal is cut off, the tension is not generated and the opposing roll 25 is pressed against the belt member 1 by the biasing force of the spring member 24.
【００３０】以上の構成によれば、ベルト部材1の継ぎ
目が速度検出ロール21を通過する時には対向ロール25が
ベルト部材1から離間しているので、速度検出ロール21
はベルト部材1の継ぎ目16を容易に乗り越えることがで
きる。従って、ベルト部材1の継ぎ目16が速度検出ロー
ル21に突き当たった際に衝撃的な力が発生する懸念がな
く、ベルト部材1を円滑に回動させて記録シートの搬送
の安定化を図ることができる。また、速度検出ロールの
回転軸22やベルト部材を支える駆動ロール12等に対して
も衝撃的な力が作用する懸念がないので、これら回転軸
22やロール12等のに要求される強度を抑えることがで
き、この転写材搬送装置全体の軽量化及びコストダウン
を図ることも可能となる。According to the above construction, since the opposing roll 25 is separated from the belt member 1 when the joint of the belt member 1 passes through the speed detection roll 21, the speed detection roll 21
Can easily get over the joint 16 of the belt member 1. Therefore, there is no concern that a shocking force will be generated when the joint 16 of the belt member 1 hits the speed detection roll 21, and the belt member 1 can be smoothly rotated to stabilize the conveyance of the recording sheet. it can. Further, since there is no concern that a shocking force acts on the rotation shaft 22 of the speed detection roll or the drive roll 12 that supports the belt member, these rotation shafts
The strength required for the rolls 22 and the rolls 12 can be suppressed, and the weight and cost of the entire transfer material conveying device can be reduced.
【００３１】尚、対向ロール25がベルト部材1から離間
すると、速度検出ロール21とベルト部材1との間に滑り
が発生し、エンコーダ23からはベルト部材1の周速に適
確に対応していない検知速度信号が出力される。しか
し、既に説明したように、本実施例ではタイミング演算
回路から継目通過信号が出力されている間、すなわち対
向ロール25がベルト部材1から離間している間は、信号
置換手段によって検知速度信号が他の信号に置き換えら
れるので、ベルト部材1の速度制御には何ら影響はな
い。When the opposed roll 25 is separated from the belt member 1, slippage occurs between the speed detection roll 21 and the belt member 1, and the encoder 23 accurately responds to the peripheral speed of the belt member 1. No detected speed signal is output. However, as described above, in the present embodiment, while the seam passage signal is being output from the timing calculation circuit, that is, while the facing roll 25 is separated from the belt member 1, the detection speed signal is detected by the signal replacement means. Since it is replaced with another signal, it has no influence on the speed control of the belt member 1.
【００３２】また、上記実施例では、継目通過信号の入
力に伴い対向ロールがベルト部材から離間するように構
成したが、速度検出ロールがベルト部材から離間するよ
うに構成しても何ら差し支えはない。更に、上記対向ロ
ール解除手段は必ずしも電磁ソレノイドである必要はな
く、例えば、対向ロール25の回転軸26に係合するカム
と、継ぎ目通過信号に応じてこのカムを駆動するモータ
であっても差し支えない。Further, in the above embodiment, the opposing roll is separated from the belt member in response to the input of the seam passage signal, but the speed detecting roll may be separated from the belt member. .. Further, the opposed roll releasing means does not necessarily have to be an electromagnetic solenoid, and may be, for example, a cam that engages with the rotating shaft 26 of the opposed roll 25 and a motor that drives this cam in response to a seam passage signal. Absent.
【００３３】[0033]
【発明の効果】以上説明してきたように、本発明の転写
材搬送装置によれば、ベルト部材の周速に応じて出力さ
れる検知速度信号に基づいてベルト部材の周速を制御す
るに際し、信号置換手段がベルト部材の継ぎ目に起因す
る誤った検知速度信号に代えてその時迄の検知速度信号
あるいは基準速度信号を出力するので、誤った検知速度
信号よってベルト部材の周速が大きく変動することがな
く、ベルト部材の周速を適確に制御することが可能とな
る。As described above, according to the transfer material conveying device of the present invention, in controlling the peripheral speed of the belt member based on the detected speed signal output according to the peripheral speed of the belt member, Since the signal replacing means outputs the detection speed signal or the reference speed signal up to that time in place of the erroneous detection speed signal due to the seam of the belt member, the peripheral speed of the belt member may largely change due to the erroneous detection speed signal. Thus, the peripheral speed of the belt member can be controlled appropriately.
【００３４】また、請求項2に記載された発明によれ
ば、ベルト部材の継ぎ目が速度検出ロールを通過する際
に、速度検出ロール若しくはベルト部材の裏面側に当接
する対向ロールをベルト部材から離間させるので、ベル
ト部材に衝撃的な力が作用することがなく、ベルト部材
を常に円滑に回動させることが可能となる。Further, according to the invention described in claim 2, when the seam of the belt member passes through the speed detecting roll, the speed detecting roll or the opposing roll which comes into contact with the back side of the belt member is separated from the belt member. Therefore, the belt member can always be smoothly rotated without any impact force acting on the belt member.
【図１】 本発明の転写材搬送装置の第一実施例を示す
正面図である。FIG. 1 is a front view showing a first embodiment of a transfer material conveying device of the present invention.
【図２】 第一実施例に係る転写材搬送装置の平面図で
ある。FIG. 2 is a plan view of the transfer material transport device according to the first embodiment.
【図３】 第一実施例に係る継目検出手段を示す斜視図
である。FIG. 3 is a perspective view showing a joint detecting means according to the first embodiment.
【図４】 第一実施例に係るベルト部材の周速の制御方
法を示すブロック図である。FIG. 4 is a block diagram showing a method for controlling the peripheral speed of the belt member according to the first embodiment.
【図５】 継目通過信号の出力タイミングを説明する参
考図である。FIG. 5 is a reference diagram illustrating an output timing of a joint passing signal.
【図６】 信号置換手段に入力される検知速度信号及び
継目通過信号と、信号置換手段から出力される信号の関
係を示すタイミングチャートである。FIG. 6 is a timing chart showing the relationship between the detected speed signal and the seam passage signal input to the signal replacement unit and the signal output from the signal replacement unit.
【図７】 継目検出手段の他の実施例を示す図である。FIG. 7 is a diagram showing another embodiment of the seam detecting means.
【図８】 対向ロール解除手段の第一実施例を示す概略
図である。FIG. 8 is a schematic view showing a first embodiment of a facing roll releasing means.
【図９】 従来技術における速度検出ロールと対向ロー
ルとの関係を示す正面図である。FIG. 9 is a front view showing a relationship between a speed detection roll and a counter roll according to a conventional technique.
【図１０】 従来用いられていたベルト部材の周速の制
御方法を示すブロック図である。FIG. 10 is a block diagram showing a conventional method of controlling the peripheral speed of a belt member.
1…ベルト部材、2…速度検出手段、3…継目検知手段、4
…対向ロール解除手段、11…駆動モータ、16…継ぎ目、
21…速度検出ロール、25…対向ロール1 ... Belt member, 2 ... Speed detecting means, 3 ... Seam detecting means, 4
... opposing roll releasing means, 11 ... driving motor, 16 ... seam,
21 ... Speed detection roll, 25 ... Opposite roll
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 15/01 １１４ Ｂ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location G03G 15/01 114 B
Claims (2)
紙等の転写材を担持して搬送するベルト部材と、このベ
ルト部材に当接して連れ回される速度検出ロールを有し
上記ベルト部材の周速Vに応じた検知速度信号を出力す
る速度検出手段と、上記検知速度信号を予め定められた
基準速度信号と比較し、その比較結果に基づいて上記ベ
ルト部材の駆動モータを制御する制御手段とを有する転
写材搬送装置において、上記ベルト部材の継目を検知す
る継目検知センサーを有すると共に検知した継目が上記
速度検出ロールを通過するタイミングを示す継目通過信
号を出力する継目検知手段を設け、且つ、上記継目通過
信号の入力時に上記検知速度信号を継目通過信号入力前
の検知速度信号若しくは上記基準速度信号に置き換える
信号置換手段を設けたことを特徴とする転写材搬送装
置。1. A belt member comprising endless belts of which both ends are connected to each other and which carries and conveys a transfer material such as a sheet, and a speed detecting roll which is brought into contact with the belt member and is rotated. Control means for comparing the detected speed signal with a predetermined reference speed signal and controlling the drive motor of the belt member based on the comparison result. In the transfer material conveying device having means, provided with a seam detection means for outputting a seam passage signal indicating a timing at which the seam detected has a seam detection sensor for detecting a seam of the belt member, Further, there is provided signal replacement means for replacing the detected speed signal with the detected speed signal before inputting the seam passage signal or the reference speed signal when the seam passage signal is input. Transfer material transporting device, characterized in that.
ロール若しくはこれと相俟ってベルト部材を挟み込む対
向ロールをベルト部材から離間させる解除手段を設けた
ことを特徴とする請求項1記載の転写材搬送装置。2. The release means for separating the speed detecting roll or an opposing roll sandwiching the belt member together with the speed detecting roll based on the input of the seam passage signal from the belt member. Transfer material transport device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4125419A JP3036226B2 (en) | 1992-04-20 | 1992-04-20 | Transfer material transfer device for image forming equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4125419A JP3036226B2 (en) | 1992-04-20 | 1992-04-20 | Transfer material transfer device for image forming equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05297737A true JPH05297737A (en) | 1993-11-12 |
| JP3036226B2 JP3036226B2 (en) | 2000-04-24 |
Family
ID=14909643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4125419A Expired - Fee Related JP3036226B2 (en) | 1992-04-20 | 1992-04-20 | Transfer material transfer device for image forming equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3036226B2 (en) |
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