JP4514973B2 - Conveying device and image forming apparatus using the same - Google Patents

Conveying device and image forming apparatus using the same Download PDF

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JP4514973B2
JP4514973B2 JP2001059915A JP2001059915A JP4514973B2 JP 4514973 B2 JP4514973 B2 JP 4514973B2 JP 2001059915 A JP2001059915 A JP 2001059915A JP 2001059915 A JP2001059915 A JP 2001059915A JP 4514973 B2 JP4514973 B2 JP 4514973B2
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sheet
paper
conveying
roller
pair
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JP2002255403A (en
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量之 内田
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

【０００１】
【産業上の利用分野】
本発明は、搬送ローラと給紙ローラを同期させる搬送装置と、これを用いた画像形成装置に関する。
【０００２】
【従来の技術】
従来、複写機等の画像形成装置における搬送装置においては、用紙の位置と画像の位置を合わせるためのレジストローラと呼ばれる搬送ローラ対が多く用いられている。このレジストローラでは画像と用紙の位置を合わせるための構成と動作を図４に基づいて説明する。
【０００３】
搬送装置は、給紙部として用紙を載置する給紙トレイ４と、用紙を搬送する給紙ローラ１、給紙ローラ１に当設して用紙を１枚ずつに分離する分離パッド５によって構成され、下流にガイド板６ａ、６ｂ、用紙の通過を検出するレジストセンサ３、レジストローラ対２ａ、２ｂが設けられている。給紙ローラ１より送られた用紙は、レジストローラ対２ａ、２ｂの近傍に設けられた用紙有無の検出手段３（以降、レジストセンサと称す。）により用紙の先端を検出して、レジストローラ対２ａ、２ｂに用紙を突き当てる。このときレジストローラ対２ａ、２ｂは回転していない。また、用紙の先端を確実にレジストローラ対２ａ、２ｂに突き当てるためにレジストセンサ３により検出された用紙の先端位置から算出されるレジストローラ対２ａ、２ｂ到着時間よりも長く給紙ローラ１を回転させることにより、用紙をたるませている。
【０００４】
その後用紙と画像のタイミングを合わせてレジストローラ対２ａ、２ｂを再駆動している。この再駆動のときに給紙ローラ１を停止するとレジストローラ対２ａ、２ｂでの搬送抵抗が大きくなり、画像伸びや紙紛の発生が起きやすくなるため、給紙ローラ１を再駆動させている場合がある。
【０００５】
また、給紙トレイ４上に載置された用紙のサイズを認識する方法として様々な方法があるが、もっとも安価な認識手段として、使用者が入力手段により用紙長さを入力する方法が用いられている。しかし、使用者が長さ入力を忘れ、給紙トレイ４に載置されている用紙長さと当初設定されている用紙長さが異なっている場合、給紙ローラを再駆動させると再駆動時間が用紙の長さを超える値になっていると、本来１枚ずつ搬送すべきところを２枚以上連続して搬送（以降、連送りと称す）してしまう。
【０００６】
そこで、特開平１０−３０１４５０号公報に開示された方法から容易に想像できるように、用紙の長さをレジストセンサの信号から演算し装置を停止する方法が考えられる。
【０００７】
【発明が解決しようとする課題】
しかし、特開平１０−３０１４５０号公報に開示された方法では、１枚目と２枚目の連送りは、用紙の重なりがあるため阻止できず、用紙の無駄を生じてしまう。
【０００８】
また、給紙ローラの用紙速度をレジストローラの用紙速度より早くして、レジストローラまでの到着時間短縮したい（生産効率をあげたい）という要望がある。
【０００９】
そして、給紙ローラの再駆動は、停止させる場合に比べ負荷が大きくなるため、分離手段の劣化を早める。
【００１０】
【課題を解決するための手段】
そこで本発明は、用紙を挟持搬送する搬送ローラ対と、用紙を載置する給紙トレイと、該給紙トレイ上の用紙を分離搬送する給紙ローラと、上記搬送ローラ対と上記給紙ローラ間に設けられ用紙の有無を検出する検出手段と、上記搬送ローラ対と上記給紙ローラの回転駆動を制御する制御手段と、上記給紙トレイに載置された用紙の長さを入力する入力手段を有する搬送装置において、上記給紙トレイから上記給紙ローラにより用紙を上記搬送ローラ対まで分離搬送し、上記給紙ローラの回転駆動をいったん停止させ、上記用紙をたわませた後に上記給紙ローラと上記搬送ローラ対とを同時に回転駆動を開始させて上記用紙を上記搬送ローラ対を通過させて搬送するものであり、用紙の連続搬送動作時において、１枚目の用紙を搬送している際に上記搬送ローラ対と上記給紙ローラとが同時に回転している時間を、２枚目以降の用紙を搬送している際に上記搬送ローラ対と上記給紙ローラとが同時に回転している時間に比べて短くすることを特徴とする。
【００１１】
また本発明は、請求項１の搬送装置において、上記給紙ローラを上記搬送ローラ対と同時に回転駆動する時間を入力する入力手段を設けたことを特徴とする。
【００１３】
そして本発明に係る画像形成装置は、請求項１または２の搬送装置を用いたことを特徴とする。
【００１４】
【発明の実施の形態】
以下、図１ないし図３により本発明の実施の形態を詳細に説明する。
まず、第一実施形態における搬送装置の基本動作を図１、図４に基づいて説明する。搬送装置の構成は上記従来の技術と同様なので省略する。図示しない制御部より搬送開始の命令がくると、給紙ローラ１は図示しない駆動源から駆動を受けて回転する。給紙ローラ１と分離パッド５により一枚ずつ搬送された用紙はガイド板６ａ、６ｂ間を通過して、レジストセンサ３からの信号により用紙の通過を検出する。この後、用紙はレジストローラ対２ａ、２ｂに送られ、たわみを形成する時間Ａを経過したのち停止する。
【００１５】
ここで図示しない制御部からのレジストスタートの信号により、レジストローラ対２ａ、２ｂは再駆動され、用紙を下流の図示しない作像部へと搬送する。このときレジストローラ対２ａ、２ｂの再駆動開始と同時に一定時間Ｂの間、給紙ローラ１も再駆動され、未搬送分の用紙を搬送する。連続搬送時は、このあと一定時間Ｃを経て２枚目の用紙の搬送を１枚目とほぼ同様な動作で行う。
【００１６】
また、用紙長さは使用者により図示しない操作部により入力される。一方、レジストセンサ３においてもＯＦＦ信号から用紙サイズを検出している。それぞれの用紙のサイズデータを比較して用紙長さの正誤の判断を図示しない制御部にて行い、用紙長さが違っていると認識されたときには搬送を中止する。
【００１７】
ここで、第一実施形態の特徴を説明する。１枚目の用紙の搬送時において同時に回転駆動を開始された給紙ローラ１とレジストローラ対２ａ、２ｂとが同時に回転している時間Ｂは、２枚目の用紙の給紙ローラ１とレジストローラ対２ａ、２ｂが同時に回転している時間Ｄと比べ短くなっている。これは本来給紙ローラ１再駆動の効果（画像伸び）を出すためには用紙長さ一杯給紙ローラ１を駆動する必要があるが、給紙トレイ上の用紙の用紙長さが使用者により入力された用紙長さよりも短い場合には、従来技術でも述べたように用紙長さを認識する前に１枚目と２枚目を連送りしてしまうため、１枚目の搬送の際の同時に回転している時間を２枚目以降よりも短くすることで、給紙トレイ上の用紙の用紙長さが使用者により入力された用紙長さよりも短い場合でも連送りすることが無いようにしている。２枚目以降の用紙は１枚目の用紙長さが正しい場合は、用紙長さが変更されることがほとんどないため、用紙長さ一杯まで給紙ローラ１を再駆動させている。
【００１８】
次に、参考例を図２に基づいて説明する。搬送装置の構成は従来技術と同じなので省略する。また搬送装置の基本動作についても第一実施形態とほぼ同じなので省略する。ここで給紙ローラ１の回転駆動開始時間はレジストローラ対２ａ、２ｂの回転駆動開始時間より一定時間Ｅ経過した後に設定されている。この一定時間Ｅは給紙ローラ１とレジストローラ対２ａ、２ｂの間に生じたたるみを解消する時間とほぼ同じに設定されている。このため給紙ローラ１の用紙速度がレジストローラ対２ａ、２ｂの用紙速度より早くしても、たるみを形成する部分があるため、用紙速度差による用紙のたわみを吸収できる。
【００１９】
次に、第二実施形態の特徴を図３に基づいて説明する。搬送装置の構成は従来技術と同じなので省略する。また搬送装置の基本動作についても第一実施形態とほぼ同じなので省略する。同時に回転駆動を開始された１枚目の用紙の給紙ローラ１とレジストローラ対２ａ、２ｂが同時に回転している時間Ｂは、最小長さの用紙通紙時に給紙ローラ１とレジストローラ対２ａ、２ｂが同時に回転していることが必要時間と同じ時間に設定してある。これにより通紙可能な用紙長さのどんな長さの用紙を給紙トレイ４上に載置しても連送りすることが無い。しかし、１枚目のみ給紙ローラ１再駆動の効果（画像伸び）が小さくなってしまう。
【００２０】
次に、第四実施形態の特徴を説明する。図示しない操作部より給紙ローラ１再駆動時間を変更可能としている。よって使用者が画像伸び等の画像品質の向上よりも、装置耐久時間の増加を望む場合に操作部より給紙ローラ１再駆動時間を短くすることが可能となる。
【００２１】
【発明の効果】
請求項１の発明によれば、用紙を搬送するレジストローラ対と、用紙を載置する給紙トレイと、給紙トレイ上の用紙を分離搬送する給紙ローラと、レジストローラ対と給紙ローラ間に設けられ用紙の有無を検出する検出手段と、レジストローラ対と給紙ローラの回転駆動を制御する制御手段と、給紙トレイに載置された用紙の長さを入力する入力手段を有する搬送装置において、給紙トレイから給紙ローラにより用紙を搬送ローラ対まで分離搬送し、給紙ローラの回転駆動をいったん停止させ、用紙をたわませた後に給紙ローラと搬送ローラ対とを同時に回転駆動を開始させて用紙を搬送ローラ対を通過させて下流へ搬送するものであり、用紙の連続搬送動作時におけるレジストローラ対と給紙ローラとが同時に回転している時間を、搬送する用紙の１枚目と２枚目以降とで異ならせているので、１枚目と２枚目の用紙の連送りを防止することができ、用紙の無駄が無く、２枚目以降の用紙に対して、より画像伸びを防止した搬送を行うことができる。
【００２２】
請求項２の発明によれば、搬送装置の連続動作における搬送ローラ対と給紙ローラとが同時に回転している時間を搬送可能な用紙の最小長さに合わせた時間としているので、すべての長さにおいて１枚目と２枚目の用紙の連送りを防止することができ用紙の無駄が無く、２枚目以降の用紙に対して、より画像伸びを防止した搬送を行うことができる。
【００２３】
請求項３の発明によれば、搬送装置の連続動作における搬送ローラ対と給紙ローラの同期時間を搬送可能な用紙の最小長さに合わせた時間としているので、すべての長さにおいて１枚目と２枚目の用紙の連送りを防止することができ用紙の無駄が無く、２枚目以降の用紙に対して、より画像伸びを防止した搬送を行うことができる。
【００２４】
請求項３の発明によれば、給紙ローラを搬送ローラ対と同時に回転駆動する時間を入力する入力手段を設けているので、画像性能（画像伸びや紙紛による汚れ等）よりも、機械耐久寿命の延長を望む場合でも設定が可能である。
【図面の簡単な説明】
【図１】 第一実施形態を動作を示すタイミングチャートである。
【図２】 参考例の動作を示すタイミングチャートである。
【図３】 第二実施形態の動作を示すタイミングチャートである。
【図４】 従来の例の構成を示す配置図である。
【符号の説明】
１ 給紙ローラ
２ａ、２ｂ レジストローラ
３ レジストセンサ
４ 給紙トレイ
５ 分離パッド
６ａ、６ｂ ガイド板[0001]
[Industrial application fields]
The present invention relates to a transport device that synchronizes a transport roller and a paper feed roller, and an image forming apparatus using the transport device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a conveying device in an image forming apparatus such as a copying machine, a pair of conveying rollers called registration rollers for aligning a sheet position and an image position are often used. The configuration and operation for aligning the position of the image and the paper in this registration roller will be described with reference to FIG.
[0003]
The transport device includes a paper feed tray 4 on which paper is placed as a paper feed unit, a paper feed roller 1 that transports the paper, and a separation pad 5 that contacts the paper feed roller 1 and separates the paper one by one. Downstream, guide plates 6a and 6b, a registration sensor 3 for detecting passage of paper and registration roller pairs 2a and 2b are provided. The sheet fed from the sheet feeding roller 1 is detected by a sheet presence / absence detecting means 3 (hereinafter referred to as a registration sensor) provided in the vicinity of the registration roller pair 2a, 2b, and the registration roller pair is detected. The sheet is abutted against 2a and 2b. At this time, the registration roller pair 2a, 2b is not rotating. Further, in order to ensure that the leading edge of the sheet abuts against the registration roller pair 2a, 2b, the feeding roller 1 is set longer than the arrival time of the registration roller pair 2a, 2b calculated from the leading edge position of the sheet detected by the registration sensor 3. The paper is slackened by rotating.
[0004]
Thereafter, the registration rollers 2a and 2b are driven again in synchronization with the timing of the paper and the image. If the paper feed roller 1 is stopped during this re-drive, the conveyance resistance of the registration roller pair 2a and 2b increases, and image elongation and paper dust are likely to occur. Therefore, the paper feed roller 1 is re-driven. There is a case.
[0005]
There are various methods for recognizing the size of the paper placed on the paper feed tray 4, but as the cheapest recognition means, a method in which the user inputs the paper length by the input means is used. ing. However, if the user forgets to input the length and the paper length placed on the paper feed tray 4 is different from the initial paper length, if the paper feed roller is driven again, the redrive time If the value exceeds the length of the sheet, two or more sheets that should originally be conveyed one by one are conveyed continuously (hereinafter referred to as continuous feeding).
[0006]
Therefore, as can be easily imagined from the method disclosed in Japanese Patent Laid-Open No. 10-301450, a method of calculating the length of the sheet from the signal of the registration sensor and stopping the apparatus is conceivable.
[0007]
[Problems to be solved by the invention]
However, in the method disclosed in Japanese Patent Laid-Open No. 10-301450, the continuous feeding of the first sheet and the second sheet cannot be prevented due to the overlap of sheets, and the sheets are wasted.
[0008]
In addition, there is a demand to make the paper speed of the paper feed roller faster than the paper speed of the registration roller to shorten the arrival time to the registration roller (to increase production efficiency).
[0009]
The re-driving of the paper feed roller increases the load compared to when it is stopped, so that the deterioration of the separating means is accelerated.
[0010]
[Means for Solving the Problems]
In view of the above, the present invention provides a pair of transport rollers for nipping and transporting paper, a paper feed tray for placing paper, a paper feed roller for separating and transporting paper on the paper feed tray, the pair of transport rollers, and the paper feed roller. Detection means for detecting the presence or absence of paper provided between them, control means for controlling the rotational drive of the pair of transport rollers and the paper feed roller, and input for inputting the length of the paper placed on the paper feed tray In the transport apparatus having means, the paper is separated and transported from the paper feed tray to the pair of transport rollers by the paper feed roller, the rotational driving of the paper feed roller is temporarily stopped, and the paper is bent and then fed. the paper roller and the transport roller pair by simultaneously rotating the initiated is intended to convey the paper is passed through the pair of conveying rollers, and have contact to the continuous conveying operation of the sheet to convey the first sheet ing The transport time roller pair and the said feed roller is rotating at the same time, the time and the conveying roller pair and the feed roller when carrying the sheet of the second and subsequent sheets are rotated simultaneously and wherein to Rukoto shorter than that.
[0011]
According to the present invention, in the transport apparatus according to claim 1, characterized in that the upper Symbol feed roller provided with input means for inputting time you rotated simultaneously with the conveying roller pair.
[0013]
The image forming apparatus according to the present invention is characterized by using the conveying device according to claim 1 or 2 .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
First, the basic operation of the transport apparatus in the first embodiment will be described with reference to FIGS. Since the configuration of the transport device is the same as that of the above-described conventional technology, the description thereof is omitted. When a conveyance start command is received from a control unit (not shown), the paper feed roller 1 is driven by a drive source (not shown) and rotates. The sheets conveyed one by one by the sheet feeding roller 1 and the separation pad 5 pass between the guide plates 6a and 6b, and the passage of the sheet is detected by a signal from the registration sensor 3. Thereafter, the sheet is sent to the registration roller pairs 2a and 2b, and stops after a time A for forming the deflection has elapsed.
[0015]
Here, in response to a registration start signal from a control unit (not shown), the registration roller pair 2a, 2b is re-driven, and conveys the sheet to a downstream image forming unit (not shown). This time, the registration roller pair 2a, during 2b redrive started at the same time as predetermined time B, the paper feed roller 1 is also driven again to convey the sheet of the non-conveying component. At the time of continuous conveyance, the second sheet is conveyed in substantially the same operation as the first sheet after a predetermined time C.
[0016]
The paper length is input by the user through an operation unit (not shown). On the other hand, the registration sensor 3 also detects the paper size from the OFF signal. The control unit (not shown) compares the paper size data with each other and determines whether the paper length is correct or not. When it is recognized that the paper length is different, the conveyance is stopped.
[0017]
Here, the features of the first embodiment will be described. 1 sheet of simultaneously rotating the initiated paper feed roller 1 and the registration roller pair 2a during conveyance of the sheet, the time B to the 2b are rotated simultaneously, the paper feeding roller 1 of the second sheet registration roller pair 2a, 2b is shorter than the time D that is rotating at the same time. Originally, it is necessary to drive the paper feed roller 1 as long as the paper length in order to produce the effect of re-driving the paper feed roller 1 (image expansion), but the paper length of the paper on the paper feed tray depends on the user. If the paper length is shorter than the input paper length, the first and second sheets are continuously fed before the paper length is recognized as described in the prior art . by shorter than the second and subsequent sheets time in rotation simultaneously, so as not to paper length of the paper on the paper feed tray is communicated feed even shorter than the paper length entered by the user Have For the second and subsequent sheets, when the first sheet length is correct, the sheet length is hardly changed, and therefore the sheet feeding roller 1 is re-driven until the sheet length is full.
[0018]
Next, a reference example will be described with reference to FIG. Since the configuration of the transport device is the same as that of the prior art, the description thereof is omitted. In addition, the basic operation of the transport device is almost the same as that of the first embodiment, and therefore will be omitted. Here the rotational driving start time of the paper feed roller 1 is set after the elapse of the registration roller pair 2a, 2b predetermined time than the rotational driving start time of the E. This fixed time E is set to be substantially the same as the time for eliminating the slack generated between the paper feed roller 1 and the pair of registration rollers 2a and 2b. For this reason, even if the paper speed of the paper feed roller 1 is faster than the paper speed of the pair of registration rollers 2a and 2b, there is a portion that forms a sag, so that the deflection of the paper due to the paper speed difference can be absorbed.
[0019]
Next, features of the second embodiment will be described with reference to FIG. Since the configuration of the transport device is the same as that of the prior art, the description thereof is omitted. In addition, the basic operation of the transport device is almost the same as that of the first embodiment, and therefore will be omitted. At the same time the paper feed roller 1 and the registration roller pair 2a of the first sheet that is to start rotating drive, time 2b is rotating simultaneously B is a minimum length feed roller 1 and the resist during the paper sheet passing of It is set to the same time as the required time that the roller pairs 2a and 2b are rotating simultaneously . As a result, no matter how long the length of paper that can be passed is placed on the paper feed tray 4, continuous feeding is not performed. However, the effect (image stretch) of re-driving the paper feed roller 1 is reduced only for the first sheet.
[0020]
Next, features of the fourth embodiment will be described. The re-driving time of the paper feed roller 1 can be changed from an operation unit (not shown). Therefore, when the user desires to increase the apparatus durability time rather than improving the image quality such as image expansion, it is possible to shorten the paper feed roller 1 redrive time from the operation unit.
[0021]
【The invention's effect】
According to the first aspect of the present invention, a pair of registration rollers for transporting paper, a paper feed tray for placing paper, a paper feed roller for separating and transporting paper on the paper feed tray, a pair of registration rollers, and a paper feed roller detecting means for detecting the presence or absence of a sheet is provided between a control unit that controls the rotational driving of the paper feed roller and the registration roller pair, an input means for inputting a length of the paper placed on the paper feed tray In the transport apparatus, the paper is separated and transported from the paper feed tray to the transport roller pair by the paper feed roller, and the rotation of the paper feed roller is temporarily stopped. After the paper is bent, the paper feed roller and the transport roller pair are at the same time the rotation drive is started by passing through a conveying roller pair paper is intended to convey to the downstream, the time and the registration roller pair during the continuous conveying operation of the paper and the paper feed roller is rotating at the same time, the transport The Since the racemate different in one sheet and the second and subsequent sheets of paper, it is possible to prevent the 1 sheet and the second sheet of the continuous feeding of paper, waste without the paper, the second and subsequent sheets paper On the other hand, it is possible to carry the image while preventing the image from stretching.
[0022]
According to the invention of claim 2, since the pair of conveying rollers and the sheet feeding roller in the continuous operation of the conveying device is a while when combined in the minimum length of the paper that can be conveyed time in rotation simultaneously, The continuous feeding of the first and second sheets can be prevented at all lengths, and there is no waste of sheets, and the second and subsequent sheets can be transported while preventing image expansion. it can.
[0023]
According to the third aspect of the present invention, the synchronization time of the conveying roller pair and the sheet feeding roller in the continuous operation of the conveying device is set to the time that matches the minimum length of the sheet that can be conveyed. Therefore, the continuous feeding of the second sheet can be prevented, and there is no waste of the sheet, and the second and subsequent sheets can be conveyed while preventing the image from being stretched.
[0024]
According to the third aspect of the present invention, since the input means for inputting the time for rotationally driving the paper feed roller at the same time as the pair of transport rollers is provided , the machine durability is higher than the image performance (image stretch, dirt due to paper dust, etc.) It can be set even if it is desired to extend the service life.
[Brief description of the drawings]
FIG. 1 is a timing chart showing the operation of a first embodiment.
FIG. 2 is a timing chart showing an operation of a reference example .
FIG. 3 is a timing chart showing the operation of the second embodiment.
FIG. 4 is a layout diagram showing a configuration of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper feed roller 2a, 2b Registration roller 3 Registration sensor 4 Paper feed tray 5 Separation pad 6a, 6b Guide plate

Claims (3)

用紙を挟持搬送する搬送ローラ対と、用紙を載置する給紙トレイと、該給紙トレイ上の用紙を分離搬送する給紙ローラと、上記搬送ローラ対と上記給紙ローラ間に設けられ用紙の有無を検出する検出手段と、上記搬送ローラ対と上記給紙ローラの回転駆動を制御する制御手段と、上記給紙トレイに載置された用紙の長さを入力する入力手段を有する搬送装置において、
上記給紙トレイから上記給紙ローラにより用紙を上記搬送ローラ対まで分離搬送し、上記給紙ローラの回転駆動をいったん停止させ、上記用紙をたわませた後に上記給紙ローラと上記搬送ローラ対とを同時に回転駆動を開始させて上記用紙を上記搬送ローラ対を通過させて搬送するものであり、
用紙の連続搬送動作時において、１枚目の用紙を搬送している際に上記搬送ローラ対と上記給紙ローラとが同時に回転している時間を、２枚目以降の用紙を搬送している際に上記搬送ローラ対と上記給紙ローラとが同時に回転している時間に比べて短くする
ことを特徴とする搬送装置。A pair of conveying rollers for nipping and conveying the sheet, a sheet feeding tray for placing the sheet, a sheet feeding roller for separating and conveying the sheet on the sheet feeding tray, and a sheet provided between the pair of conveying rollers and the sheet feeding roller Detecting means for detecting the presence or absence of paper, a control means for controlling the rotational driving of the pair of transport rollers and the paper feed roller, and a transport apparatus having input means for inputting the length of the paper placed on the paper feed tray In
The sheet is separated and conveyed from the sheet feed tray to the pair of conveying rollers by the sheet feeding roller, the rotation driving of the sheet feeding roller is temporarily stopped, and after the sheet is bent, the sheet feeding roller and the pair of conveying rollers are separated. At the same time, and the paper is transported through the pair of transport rollers by starting rotational driving,
And have you in continuous conveying operation of the sheet, the time at which the conveying roller pair and the said feed roller is rotating at the same time carrying the first sheet, and convey the sheet of the second and subsequent sheets the conveying roller pair and the transport device in which the feed roller and is characterized that you shorter than the time which is rotating at the same time you are. 請求項１の搬送装置において、上記給紙ローラを上記搬送ローラ対と同時に回転駆動する時間を入力する入力手段を設けたことを特徴とする搬送装置。In conveying apparatus according to claim 1, conveying device, characterized in that the upper Symbol feed roller provided with input means for inputting time you rotated simultaneously with the conveying roller pair. 請求項１または２の搬送装置を用いたことを特徴とする画像形成装置。An image forming apparatus using the conveying device according to claim 1.
JP2001059915A 2001-03-05 2001-03-05 Conveying device and image forming apparatus using the same Expired - Fee Related JP4514973B2 (en)

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JP4789633B2 (en) * 2005-11-15 2011-10-12 株式会社リコー Feeding and conveying control method and image forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06107357A (en) * 1992-09-30 1994-04-19 Sanyo Electric Co Ltd Electrophotographic device
JPH06298411A (en) * 1993-04-19 1994-10-25 Canon Inc Control method for sheet material feeder
JPH09265220A (en) * 1996-03-27 1997-10-07 Ricoh Co Ltd Image forming device
JPH10279132A (en) * 1997-04-10 1998-10-20 Ricoh Co Ltd Paper feeding device for image forming device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06107357A (en) * 1992-09-30 1994-04-19 Sanyo Electric Co Ltd Electrophotographic device
JPH06298411A (en) * 1993-04-19 1994-10-25 Canon Inc Control method for sheet material feeder
JPH09265220A (en) * 1996-03-27 1997-10-07 Ricoh Co Ltd Image forming device
JPH10279132A (en) * 1997-04-10 1998-10-20 Ricoh Co Ltd Paper feeding device for image forming device

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