JPS6330256B2 - - Google Patents
Info
- Publication number
- JPS6330256B2 JPS6330256B2 JP56112221A JP11222181A JPS6330256B2 JP S6330256 B2 JPS6330256 B2 JP S6330256B2 JP 56112221 A JP56112221 A JP 56112221A JP 11222181 A JP11222181 A JP 11222181A JP S6330256 B2 JPS6330256 B2 JP S6330256B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet material
- leading edge
- feeding roller
- rotating body
- fed
- 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.)
- Expired
Links
- 238000003708 edge detection Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 108091008695 photoreceptors Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
- G03G15/6558—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point
- G03G15/6561—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration
- G03G15/6564—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration with correct timing of sheet feeding
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Registering Or Overturning Sheets (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Paper Feeding For Electrophotography (AREA)
Description
【発明の詳細な説明】
この発明は、一定速度で回転又は周動する回転
体又は周動体の外周面上の所定の位置に、給送さ
れたシート材の先端を合せる位置合せ装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device that aligns the leading end of a fed sheet material to a predetermined position on the outer peripheral surface of a rotating body or a rotating body that rotates or circumferentially moves at a constant speed.
転写方式の電子写真複写機においてはドラム又
は無端ベルト状の感光体に転写紙を給送して感光
体上に形成されたトナー像を転写する。この場合
感光体上の画像形成域の前端と転写紙の先端が一
致しなかつた場合はコピー上の画像位置が原稿と
ずれることになる。又給紙台より給送ローラによ
り給送される転写紙を転写ドラムに巻着けた上、
感光体ドラムと接触させて転写を行う方式の複写
機では、転写紙の先端は転写ドラムの周面のある
位置に設けられたクランパーで把持されて転写ド
ラムに巻付けられるので、もし回動してくる転写
ドラム上のクランパーと給送ローラにより給送さ
れる転写紙の先端の位置が合はない場合は確実に
クランプされないことになる。 In a transfer type electrophotographic copying machine, a transfer paper is fed to a drum or an endless belt-shaped photoreceptor, and a toner image formed on the photoreceptor is transferred. In this case, if the front edge of the image forming area on the photoreceptor does not match the leading edge of the transfer paper, the image position on the copy will be shifted from the original. In addition, the transfer paper fed by the feed roller from the paper feed table is wound around the transfer drum, and then
In copying machines that perform transfer by contacting the photoreceptor drum, the leading edge of the transfer paper is gripped by a clamper installed at a certain position on the circumference of the transfer drum and wrapped around the transfer drum. If the leading edge of the transfer paper fed by the feeding roller and the clamper on the transfer drum do not match, the paper will not be clamped reliably.
上記のような位置合せのための給送ローラは一
般的にレジストローラと言われている。その作用
を第１図により説明すると、給紙台上に載置され
たシート束７′から給紙コロ３により１枚ずつ給
送されたシート材７は停止状態にあるレジストロ
ーラ１，２の接触部に先端が衝き当り、図に示す
如く若干たわみを持つた状態で停止し待期する。
一定速度で回転している回転体６の周面上のシー
ト材先端と合わせるべき所定位置ｎがＰの位置に
来た時レジストローラ１，２は駆動モータ４によ
り回転を開始し、シート材７を位置合せ点P′に向
つて給送する。回転体６上の上記の所定位置ｎが
点P′に到達した時にシート材７の先端もP′に達し
て位置合せができるように、回転体６の周速Ｖ、
レジストローラ１，２の給送速度V′PP⌒′の距離
ａ、レジストローラ１，２の接点とP′の間の距離
ｂとは次の関係に設定されている。 The above-mentioned feeding rollers for alignment are generally called registration rollers. To explain the operation with reference to FIG. 1, the sheet material 7, which is fed one by one by the paper feed roller 3 from the sheet bundle 7' placed on the paper feed table, is transferred to the registration rollers 1 and 2 which are in a stopped state. The tip hits the contact part, and as shown in the figure, it stops with a slight bend and waits.
When a predetermined position n to be aligned with the leading edge of the sheet material on the circumferential surface of the rotating body 6 rotating at a constant speed reaches position P, the registration rollers 1 and 2 start rotating by the drive motor 4, and the sheet material 7 is fed toward the alignment point P′. The circumferential speed V of the rotating body 6 is set so that when the above-mentioned predetermined position n on the rotating body 6 reaches the point P', the tip of the sheet material 7 also reaches P' and alignment is possible.
The distance a between the feeding speed V'PP⌒' of the registration rollers 1 and 2 and the distance b between the contact point of the registration rollers 1 and 2 and P' are set in the following relationship.
ａ／Ｖ＝ｂ／V′
したがつて、ａ＝ｂとしておけばレジストローラ
の給送速度V′は回転体の周速Ｖと同じにするこ
とができる。 a/V=b/V' Therefore, by setting a=b, the feeding speed V' of the registration roller can be made the same as the circumferential speed V of the rotating body.
さてレジストローラ１，２が回転した時に、待
期していたシート材７はローラ１，２に咬持され
給送されるのであるがシート材の材質、紙厚、た
るみ量等によつて、シート材７の先端とローラ対
１，２の接点との位置関係、咬持状態に差を生
じ、これによつて回転体６上の所定の位置ｎとシ
ート材７の先端との位置合せにバラツキが発生す
る。 Now, when the registration rollers 1 and 2 rotate, the waiting sheet material 7 is held by the rollers 1 and 2 and fed, but depending on the material of the sheet material, paper thickness, amount of slack, etc. Differences occur in the positional relationship and engagement state between the tip of the material 7 and the contact points of the roller pairs 1 and 2, which causes variations in alignment between a predetermined position n on the rotating body 6 and the tip of the sheet material 7. occurs.
この発明は、従来のレジストローラによるシー
ト材位置合せ装置の上述の欠点を除去した、高精
度の位置合せが可能なシート材位置合せ装置を提
供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet material positioning device that eliminates the above-mentioned drawbacks of the conventional sheet material positioning device using registration rollers and is capable of highly accurate positioning.
以下、この発明をその実施例を示す図面にもと
ずいて詳細に説明する。 Hereinafter, the present invention will be explained in detail based on drawings showing embodiments thereof.
第２図は、本発明を第１図で説明した従来の装
置に適用した実施例を示す図である。したがつ
て、同じ部材に対しては同じ符号を付して説明す
る。 FIG. 2 is a diagram showing an embodiment in which the present invention is applied to the conventional device described in FIG. 1. Therefore, the same members will be described with the same reference numerals.
この装置においては、図に示す如く、レジスト
ローラ１，２の下流側にシート材先端検知センサ
５が設けられている。又レジストローラ駆動モー
タ４にはステツピングモータを使用し、或る範囲
内で容易に速度変換が出来るようになつている。 In this apparatus, as shown in the figure, a sheet material leading edge detection sensor 5 is provided downstream of the registration rollers 1 and 2. Further, a stepping motor is used as the registration roller drive motor 4, so that the speed can be easily changed within a certain range.
この装置は以上の如く構成されているので、回
転体６上の所定の位置ｎがＰ点に来た時にレジス
トローラ１，２が所定の速度で回転を開始し、シ
ート材７が給送され、その先端がセンサー５によ
り検知され、基準値と比較される。もし、基準値
より遅れて先端が検知された場合は、駆動モータ
４の速度を増速することによつて、回転体６上の
点ｎがP′に到達する時にシート材７の先端もP′点
に達するように制御される。 Since this device is configured as described above, when a predetermined position n on the rotating body 6 reaches point P, the registration rollers 1 and 2 start rotating at a predetermined speed, and the sheet material 7 is fed. , its tip is detected by the sensor 5 and compared with a reference value. If the leading edge is detected later than the reference value, by increasing the speed of the drive motor 4, when the point n on the rotating body 6 reaches P', the leading edge of the sheet material 7 will also be at P'. ′ point.
例えばシート材先端がセンサー５で検知された
時点が基準値よりΔtだけ遅れたとする。その場
合はセンサー５からP′点迄の距離ｂ−ｃを基準速
度V′で進む場合の時間ｂ−ｃ／V′よりもΔtだけ少い
時間で進むような速度にすればよい。したがつて
その速度V″は次のようになる。 For example, assume that the time when the leading edge of the sheet material is detected by the sensor 5 is delayed by Δt from the reference value. In that case, the speed should be set so that the distance b-c from the sensor 5 to point P' is traveled in a time shorter by Δt than the time b-c/V' when traveling at the reference speed V'. Therefore, its velocity V'' is as follows.
V″＝（ｂ−ｃ）／（ｂ−ｃ）／V′−Δt
これによつて、シート材７の厚さ、紙質等によ
るレジケトローラ１，２への喰込み量の差にもと
ずくバラツキが吸収され、高精度の位置合せがで
きる。 V″=(b-c)/(b-c)/V′-Δt This allows for variations in the amount of biting into the registration rollers 1 and 2 due to the thickness of the sheet material 7, paper quality, etc. is absorbed, allowing highly accurate alignment.
上記の実施例では、レジストローラの駆動モー
タ４をある範囲内自由に変えられるものとし、セ
ンサー５から位置合せ点P′迄一定の速度で搬送す
るものとしたがこの他次のように修正することも
可能である。即ち、駆動用モータ４の速度を基準
速度V1と高速度V2の２段階に変速できるように
し、シート先端検知時点の基準値からの遅れ量に
応じて、高速駆動時間と基準速度駆動時間の比率
を変化させ、回転体６上の点ｎとシート材先端の
位置合せを行うこともできる。以上説明した作動
をフローチヤートに示せば第３図の如くなる。
又、その制御回路のブロツク図を第４図に示す。
その作用は上記説明及び第３図のフローチヤート
より明らかであるから説明は省略する。 In the above embodiment, the drive motor 4 of the registration roller can be changed freely within a certain range, and the registration roller is conveyed from the sensor 5 to the alignment point P' at a constant speed, but the following modifications can also be made. It is also possible. That is, the speed of the drive motor 4 can be changed to two stages, a reference speed V 1 and a high speed V 2 , and the high speed drive time and the reference speed drive time are adjusted according to the amount of delay from the reference value at the time of sheet leading edge detection. It is also possible to align the point n on the rotary body 6 and the leading edge of the sheet material by changing the ratio. The operation described above is shown in a flowchart as shown in FIG. 3.
A block diagram of the control circuit is shown in FIG.
Since the effect is clear from the above description and the flowchart of FIG. 3, the explanation will be omitted.
以上の如く、本発明によりシート材の位置合せ
を精度高く行うことが可能となる。 As described above, the present invention makes it possible to align sheet materials with high precision.
第１図は従来のシート材位置合せ装置の一例を
示す断面図、第２図は本発明の実施例を示す断面
図、第３図は本発明の実施例の作動フローチヤー
ト、第４図は本発明の実施例の制御回路を示すブ
ロツク図である。
１，２……給送ローラ（レジストローラ）、５
……シート材先端検知センサ、６……回転体、７
……シート材、ｎ……回転体上の所定位置。
FIG. 1 is a sectional view showing an example of a conventional sheet material positioning device, FIG. 2 is a sectional view showing an embodiment of the present invention, FIG. 3 is an operation flow chart of the embodiment of the present invention, and FIG. FIG. 2 is a block diagram showing a control circuit according to an embodiment of the present invention. 1, 2... Feeding roller (registration roller), 5
... Sheet material tip detection sensor, 6 ... Rotating body, 7
...Sheet material, n...Predetermined position on the rotating body.
Claims (1)
体の外周面上の所定の位置に給送されたシート材
の先端を合せる位置合せ装置であつて、停止せる
給送ローラに先端を衝き当てた状態でシート材を
待期させ、上記の回転体又は周動体上の上記の所
定の位置がある位置に来たときに上記の給送ロー
ラの駆動を開始しシート材を給送して位置合せを
行う装置において、上記の給送ローラの駆動モー
タを可変速モータとするとともに、上記の給送ロ
ーラの下流側に位置するシート材先端検知手段
と、給送ローラの駆動開始より前記のシート材検
知手段がシート材先端を検知する時点迄の時間を
基準値と比較しそれらの差を求める手段と、その
差に応じて前記回転体又は周動体上の上記所定の
位置とシート材の先端とが同時に位置合せ位置に
到達するように前記給送ローラの駆動モータの回
転を制御する制御手段を設けたことを特徴とする
シート材位置合せ装置。1 A positioning device that aligns the leading edge of a fed sheet material to a predetermined position on the outer circumferential surface of a rotating body or a rotating body that rotates or circumferentially moves at a constant speed, and in which the leading edge hits a feeding roller that is stopped. The sheet material is waited in the state where it is held, and when it reaches the predetermined position on the rotating body or the rotating body, the driving of the feeding roller is started and the sheet material is fed to the position. In the device for aligning, the driving motor of the feeding roller is a variable speed motor, and a sheet material leading edge detection means located downstream of the feeding roller is provided, and a sheet material leading edge detecting means is provided on the downstream side of the feeding roller. means for comparing the time up to the time when the material detection means detects the leading edge of the sheet material with a reference value and determining the difference therebetween; 1. A sheet material positioning apparatus, comprising: a control means for controlling rotation of a drive motor of said feeding roller so that said feeding rollers reach a positioning position at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56112221A JPS5814159A (en) | 1981-07-20 | 1981-07-20 | Sheet material alignment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56112221A JPS5814159A (en) | 1981-07-20 | 1981-07-20 | Sheet material alignment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5814159A JPS5814159A (en) | 1983-01-26 |
| JPS6330256B2 true JPS6330256B2 (en) | 1988-06-17 |
Family
ID=14581278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56112221A Granted JPS5814159A (en) | 1981-07-20 | 1981-07-20 | Sheet material alignment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5814159A (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4416534A (en) * | 1981-11-05 | 1983-11-22 | Xerox Corporation | Apparatus and method for registering copy sheets in a variable pitch reproduction machine |
| JPS59140085A (en) * | 1983-02-01 | 1984-08-11 | Fuji Xerox Co Ltd | Feeder |
| JPS59212340A (en) * | 1983-05-16 | 1984-12-01 | Ricoh Co Ltd | Paper feeding device |
| JPS60162265A (en) * | 1984-02-01 | 1985-08-24 | Fuji Xerox Co Ltd | Form carrying device |
| JPS60236779A (en) * | 1984-05-10 | 1985-11-25 | Fuji Xerox Co Ltd | Feeder for thin sheet form material |
| JPS6179338U (en) * | 1984-10-30 | 1986-05-27 | ||
| JPS61130147A (en) * | 1984-11-30 | 1986-06-18 | Canon Inc | Sheet conveyance device |
| JPS6273281A (en) * | 1985-09-27 | 1987-04-03 | Fuji Xerox Co Ltd | Registration adjusting device |
| JPS6288748A (en) * | 1985-10-11 | 1987-04-23 | Fuji Xerox Co Ltd | Transferring position controller for copying paper |
| JPH0711738B2 (en) * | 1986-09-11 | 1995-02-08 | 富士ゼロックス株式会社 | Copier control device |
| JPS6397548A (en) * | 1986-10-15 | 1988-04-28 | Canon Inc | Sheet gripping device |
| JPS6397549A (en) * | 1986-10-15 | 1988-04-28 | Canon Inc | Sheet gripping device |
| JP2688038B2 (en) * | 1986-12-04 | 1997-12-08 | キヤノン株式会社 | Sheet transport device |
| US5043771A (en) * | 1988-05-24 | 1991-08-27 | Konica Corporation | Image forming apparatus having a controller for controlling the registration rollers |
| JP3041454B2 (en) * | 1988-12-28 | 2000-05-15 | 株式会社日立製作所 | Printing positioning control method and control device, and printer |
| US5278623A (en) * | 1989-06-21 | 1994-01-11 | Konica Corporation | Image forming apparatus |
| JPH0810813Y2 (en) * | 1989-11-17 | 1996-03-29 | 日立工機株式会社 | Paper transport device for printing equipment |
| JP3119766B2 (en) * | 1993-05-20 | 2000-12-25 | 富士通株式会社 | Image forming device |
| US10955788B1 (en) | 2019-08-26 | 2021-03-23 | Toshiba Tec Kabushiki Kaisha | Image forming apparatus having motor controller, paper conveyance method, and non-transitory computer readable medium |
-
1981
- 1981-07-20 JP JP56112221A patent/JPS5814159A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5814159A (en) | 1983-01-26 |
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