JPH04236565A - Paper carrier control system for original reader - Google Patents

Paper carrier control system for original reader

Info

Publication number
JPH04236565A
JPH04236565A JP3018265A JP1826591A JPH04236565A JP H04236565 A JPH04236565 A JP H04236565A JP 3018265 A JP3018265 A JP 3018265A JP 1826591 A JP1826591 A JP 1826591A JP H04236565 A JPH04236565 A JP H04236565A
Authority
JP
Japan
Prior art keywords
paper
temperature
feed
feed roller
paper feed
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.)
Pending
Application number
JP3018265A
Other languages
Japanese (ja)
Inventor
Hideaki Taniguchi
谷口 英明
Yasuhiro Matsuda
安弘 松田
Takumi Nakayama
巧 中山
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.)
PFU Ltd
Original Assignee
PFU Ltd
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 PFU Ltd filed Critical PFU Ltd
Priority to JP3018265A priority Critical patent/JPH04236565A/en
Publication of JPH04236565A publication Critical patent/JPH04236565A/en
Pending legal-status Critical Current

Links

Landscapes

  • Facsimiles In General (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Character Input (AREA)
  • Image Input (AREA)

Abstract

PURPOSE:To feed paper with high accuracy regardless of employing a paper feed roller made of an inexpensive material such as urethane by mounting a temperature sensor in the vicinity of the feed roller and correcting a paper feed control variable of the feed roller based on the detected temperature. CONSTITUTION:A paper feed quantity initial correction processing section 11 is started at the shipment adjustment of the original reader and obtains an error of an actual paper feed quantity with respect to a control variable for feeding paper 8 while setting a temperature in the vicinity of a feed roller 2 measured by a temperature sensor 9 as a reference temperature T0, and calculates an initial correction coefficient a to decide an initial setting paper feed control variable Ha. A paper feed quantity correction processing section 12 detects a temperature T in the vicinity of the feed roller in the operation of the original reader such as prior to start of original reading and calculates the relation of H1=(1+betaT1-T0))H0 and drives a motor 1 based on the obtained H1. Thus, the feed quantity of the paper 8 is controlled with high accuracy without being affected of manufacture tolerance and a temperature change in the feed roller 2.

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、文字読取装置OCRや
イメージスキャナなどの用紙搬送型の原稿読取装置にお
ける用紙送り量の温度補正のための用紙搬送制御方式に
関する。原稿読取装置にウレタンなどの安価な素材の用
紙送りローラを用いた場合、用紙送り量の精度が低下し
やすい。本発明は、そのような送りローラを用いた場合
の用紙送り量の精度の改善を図るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper conveyance control system for temperature correction of paper feed amount in a paper conveyance type document reading device such as a character reading device OCR or an image scanner. When a paper feed roller made of an inexpensive material such as urethane is used in a document reading device, the accuracy of the paper feed amount tends to decrease. The present invention aims to improve the accuracy of the paper feed amount when such a feed roller is used.

【0002】0002

【従来の技術】図4に、従来の用紙搬送型原稿読取装置
の内部構造を示す。図中、1はモータ、2は送りローラ
、3はベルト、4は従動ローラ、5は読取ユニット、6
は蛍光灯、7はCCD、8は用紙(原稿)である。モー
タ1が回転するとベルト3により送りローラ2が矢印方
向に回転し、用紙8は、送りローラ2と従動ローラ4に
より右方から読取ユニット5の下へ給送され、左方へ排
出される。用紙8は、読取ユニット5の下を通過する際
、蛍光灯6によって照明され、CCD7によって読み取
られる。
2. Description of the Related Art FIG. 4 shows the internal structure of a conventional paper conveyance type document reading device. In the figure, 1 is a motor, 2 is a feed roller, 3 is a belt, 4 is a driven roller, 5 is a reading unit, 6
7 is a fluorescent lamp, 7 is a CCD, and 8 is paper (original). When the motor 1 rotates, the belt 3 causes the feed roller 2 to rotate in the direction of the arrow, and the paper 8 is fed from the right under the reading unit 5 by the feed roller 2 and the driven roller 4, and is ejected to the left. When the paper 8 passes under the reading unit 5, it is illuminated by the fluorescent lamp 6 and read by the CCD 7.

【0003】送りローラ2は、高精度の用紙送りを行う
ために従来金属材料でつくられていたが、材料コストと
加工の工数が大きいため原稿読取装置が高価なものにな
る。そのため、ウレタンなどの安価な材料を用いた送り
ローラも採用されている。しかしたとえばウレンタの送
りローラの場合、蛍光灯の発熱などによる温度上昇によ
りローラ径が変化しやすく、また製造上、ローラ径や表
面粗さ、硬度、ローラ間圧力などにバラツキが出やすく
、用紙送りの精度に大きな影響があった。
[0003] The feed roller 2 has conventionally been made of a metal material in order to feed the paper with high precision, but the material cost and the number of processing steps are large, making the document reading device expensive. Therefore, feed rollers made of inexpensive materials such as urethane are also used. However, in the case of urethane feed rollers, for example, the roller diameter is likely to change due to temperature increases caused by heat generated by fluorescent lights, and due to manufacturing, variations in roller diameter, surface roughness, hardness, inter-roller pressure, etc. are likely to occur, and paper feed Accuracy was significantly affected.

【0004】0004

【発明が解決しようとする課題】従来のウレタンなどの
安価な素材の送りローラを用いた原稿読取装置では、用
紙の送り量が温度の影響を受け易いため、環境温度の変
化により、読取画像が伸縮したり、用紙上の画像切り出
し位置がずれるなどの不都合が生じた。また送りローラ
の製造上のバラツキが大きいため、検査や調整に工数が
多くかかるという不都合もあった。本発明は、ウレタン
などの安価な素材の送りローラを用いた原稿読取装置に
おいて、温度変化や製造上のバラツキによる用紙送り量
の精度低下を改善するための手段を提供することを目的
としている。
[Problems to be Solved by the Invention] In conventional document reading devices that use feed rollers made of inexpensive materials such as urethane, the amount of paper feed is easily affected by temperature. Inconveniences such as expansion and contraction and shifting of the image cutting position on the paper occurred. Furthermore, since there are large manufacturing variations in the feed roller, there is also the disadvantage that inspection and adjustment require a large number of man-hours. SUMMARY OF THE INVENTION An object of the present invention is to provide a means for improving the accuracy of paper feed amount due to temperature changes and manufacturing variations in a document reading device using a feed roller made of an inexpensive material such as urethane.

【0005】[0005]

【課題を解決するための手段】本発明は、送りローラの
周囲温度を検出して送りローラを駆動するモータに対す
る送り制御量を変化させることによって送り量が温度の
影響を受けないようにし、また製造段階で送りローラに
対する送り制御量と実際の送り量との差を検出して送り
制御量を初期補正することによって送りローラのバラツ
キの影響を解消するものである。図1は、本発明の原理
的構成図である。図1において、 1は、用紙送り駆動用のモータである。たとえばパルス
モータである。 2は、送りローラである。 3は、送りローラを駆動するベルトである。 4は、送りローラと対向する従動ローラである。 5は、読取ユニットである。 6は、用紙の読み取り面を照明する蛍光灯である。 7は、用紙面の画像を読み取るCCDである。 8は、用紙である。
[Means for Solving the Problems] The present invention detects the ambient temperature of the feed roller and changes the feed control amount for the motor that drives the feed roller so that the feed amount is not affected by the temperature. The influence of variations in the feed roller is eliminated by detecting the difference between the feed control amount and the actual feed amount for the feed roller at the manufacturing stage and initially correcting the feed control amount. FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, 1 is a motor for driving paper feed. For example, a pulse motor. 2 is a feed roller. 3 is a belt that drives the feed roller. 4 is a driven roller that faces the feed roller. 5 is a reading unit. 6 is a fluorescent lamp that illuminates the reading surface of the paper. 7 is a CCD that reads the image on the paper surface. 8 is paper.

【0006】9は、送りローラの近傍に取り付けられた
温度センサである。 10は、制御装置である。 11は、送りローラのバラツキによる用紙送り量の誤差
を補正する処理を行う用紙送り量初期補正処理部である
。 12は、送りローラの温度変化による用紙送り量の変化
を補正する処理を行う用紙送り量温度補正処理部である
。 T0 は、補正の基準温度である。 αは、初期補正係数である。 Hi は、初期補正前の用紙送り制御量であり、たとえ
ばパルスモータのパルス駆動周波数である。 H0 は、Hi に(1+α)を乗算することによって
初期補正された初期設定用紙送り制御量である。 βは、送りローラの温度変化による用紙送り量の変化を
補正するための温度補正係数であり、送りローラの径の
温度変化特性に基づいて予め求められている。 T1 は、動作中の温度である。 H1 は、H0 に(1+β(T1 −T0))を乗算
することによって温度補正された補正用紙送り制御量で
ある。
Reference numeral 9 denotes a temperature sensor attached near the feed roller. 10 is a control device. Reference numeral 11 denotes a paper feed amount initial correction processing unit that performs processing to correct errors in the paper feed amount due to variations in the feed roller. Reference numeral 12 denotes a paper feed amount temperature correction processing unit that performs processing to correct changes in the paper feed amount due to changes in the temperature of the feed roller. T0 is the reference temperature for correction. α is an initial correction coefficient. Hi is the paper feed control amount before initial correction, and is, for example, the pulse drive frequency of the pulse motor. H0 is an initial paper feed control amount that is initially corrected by multiplying Hi by (1+α). β is a temperature correction coefficient for correcting changes in the paper feed amount due to changes in the temperature of the feed roller, and is determined in advance based on the temperature change characteristics of the diameter of the feed roller. T1 is the temperature during operation. H1 is a corrected paper feed control amount that is temperature-corrected by multiplying H0 by (1+β(T1 - T0)).

【0007】[0007]

【作用】    図1において、用紙送り量初期補正処
理部11は、原稿読取装置の出荷調整時等に起動され、
温度センサ9によって測定される送りローラ2の近傍の
温度を基準温度T0 として用紙8の送りのための制御
量に対する実際の用紙送り量の誤差を求め、初期補正係
数αを算出して初期設定用紙送り制御量H0 を決定す
る。用紙送り量温度補正処理部12は、原稿読取装置の
動作時、たとえば原稿読み取り開始前に、送りローラ2
の近傍の温度Tを検出し、H1 =(1+β(T1 −
T0 ))H0 を計算して、求めたH1 によりモー
タ1を駆動する。これにより用紙8の送り量は、送りロ
ーラ2の製造上のバラツキおよび温度変化による影響を
受けずに高い精度で制御されることができる。
[Function] In FIG. 1, the paper feed amount initial correction processing section 11 is activated at the time of shipping adjustment of the document reading device, etc.
Using the temperature near the feed roller 2 measured by the temperature sensor 9 as a reference temperature T0, the error in the actual paper feed amount with respect to the control amount for feeding the paper 8 is determined, and the initial correction coefficient α is calculated to perform initial setting paper feed control. Determine the quantity H0. The paper feed amount temperature correction processing unit 12 adjusts the feed roller 2 during operation of the document reading device, for example, before starting to read the document.
Detect the temperature T near H1 = (1+β(T1 −
T0 )) H0 is calculated, and the motor 1 is driven by the obtained H1. Thereby, the feed amount of the paper 8 can be controlled with high precision without being affected by manufacturing variations in the feed roller 2 or temperature changes.

【0008】[0008]

【実施例】図2および図3により、本発明の実施例を説
明する。なお必要に応じて図1の構成が参照される。図
2は、用紙送り量初期補正処理の実施例のフローである
。 (1)では、用紙8の実際長を測定し、lとする。 (2)では、実際の用紙長lをコンソールから入力する
。 (3)では、入力された実際の用紙長lをモータ1の1
パルス当りの送り量(1/240”とする)で除算し、
ラスタ数P0 に変換する。 P0 =  240/25.4・l (4)では、用紙8を装置に通し、CCD7の出力によ
り用紙の先端と後端とを検出することによって、その間
の用紙長のラスタ数P1 をカウントする。 (5)では、P0 とP1 の差量ΔP=P0 −P1
 を求める。 (6)では、温度センサ9により、このときの基準温度
T0 を測定する。 (7)では、ΔP/P0 から初期補正係数αを求め、
さらにモータ1のパルス駆動周波数Hi に(1+α)
を乗算して初期設定パルス駆動周波数H0 を求めて、
T0 とともに装置内に設定する。
Embodiment An embodiment of the present invention will be explained with reference to FIGS. 2 and 3. Note that the configuration of FIG. 1 is referred to as necessary. FIG. 2 is a flowchart of an embodiment of paper feed amount initial correction processing. In (1), the actual length of the paper 8 is measured and set as l. In (2), the actual paper length l is input from the console. In (3), the input actual paper length l is
Divide by the feed amount per pulse (1/240"),
Convert to raster number P0. P0 = 240/25.4·l (4) In step 4, the paper 8 is passed through the device, and the leading and trailing edges of the paper are detected by the output of the CCD 7, thereby counting the number of rasters P1 of the paper length between them. In (5), the difference between P0 and P1 ΔP=P0 - P1
seek. In (6), the temperature sensor 9 measures the reference temperature T0 at this time. In (7), find the initial correction coefficient α from ΔP/P0,
Furthermore, the pulse drive frequency Hi of motor 1 (1+α)
Find the initial setting pulse drive frequency H0 by multiplying by
Set in the device along with T0.

【0009】次に図3は、用紙送り量温度補正処理の実
施例のフローである。 (8)では、温度センサ9により、動作中の温度T1 
を測定する。 (9)では、測定した温度T1 と先に設定されている
基準温度T0 とから、温度変化量ΔT=T0 −T1
 を算出する。 (10)では、先に設定されている初期設定パルス駆動
周波数H0 と、温度補正係数βと、温度変化量ΔTと
から、温度補正パルス駆動周波数H1 を算出する。 H1 =(1+β・ΔT)H0  このようにして求められた温度補正駆動周波数H1 に
よりパルスを発生し、図1のモータ1を駆動する。
Next, FIG. 3 is a flowchart of an embodiment of paper feed amount temperature correction processing. In (8), the temperature sensor 9 detects the temperature T1 during operation.
Measure. In (9), from the measured temperature T1 and the previously set reference temperature T0, the temperature change amount ΔT=T0 - T1
Calculate. In (10), the temperature correction pulse drive frequency H1 is calculated from the previously set initial setting pulse drive frequency H0, the temperature correction coefficient β, and the temperature change amount ΔT. H1 = (1+β·ΔT)H0 Pulses are generated using the temperature-corrected drive frequency H1 determined in this way to drive the motor 1 in FIG.

【0010】0010

【発明の効果】本発明により初期補正が自動的に行われ
るため、従来送りローラ等のバラツキの検査や調整に要
した工数が大幅に削減される。また送りローラの温度補
正が行われることにより、熱膨張率の小さい高価な金属
ローラを用いる必要がなくなり、装置全体のコストダウ
ンが可能となり、さらにプログラムによる画像の伸縮補
正や切出し位置の補正が不要となることによりメモリ資
源が節約され、処理速度も向上する効果が得られる。
Effects of the Invention Since the present invention automatically performs initial correction, the number of man-hours conventionally required for inspecting and adjusting variations in feed rollers, etc., can be significantly reduced. In addition, by correcting the temperature of the feed roller, there is no need to use an expensive metal roller with a low coefficient of thermal expansion, which reduces the cost of the entire device.Furthermore, there is no need to use a program to correct image expansion/contraction or crop position. This saves memory resources and improves processing speed.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の原理的構成図である。FIG. 1 is a diagram showing the basic configuration of the present invention.

【図2】用紙送り量初期補正処理の実施例フロー図であ
る。
FIG. 2 is a flow diagram of an embodiment of paper feed amount initial correction processing.

【図3】用紙送り量温度補正処理の実施例フロー図であ
る。
FIG. 3 is a flow diagram of an embodiment of paper feed amount temperature correction processing.

【図4】従来の用紙搬送型原稿読取装置の内部構造説明
図である。
FIG. 4 is an explanatory diagram of the internal structure of a conventional paper conveyance type document reading device.

【符号の説明】[Explanation of symbols]

1  モータ 2  送りローラ 3  ベルト 4  従動ローラ 5  読取ユニット 6  蛍光灯 7  CCD 8  用紙 9  温度センサ 10  制御装置 11  用紙送り量初期補正処理部 12  用紙送り量温度補正処理部 1 Motor 2 Feed roller 3 Belt 4 Driven roller 5 Reading unit 6. Fluorescent light 7 CCD 8 Paper 9 Temperature sensor 10 Control device 11 Paper feed amount initial correction processing section 12 Paper feed amount temperature correction processing section

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  送りローラを用いて用紙を読取部に給
送あるいは読取部から用紙を排出する用紙搬送型の原稿
読取装置において、送りローラの近傍に温度センサを取
り付け、温度センサにより検出される温度に基づいて送
りローラの用紙送り制御量を補正することを特徴とする
原稿読取装置の用紙搬送制御方式。
Claim 1: In a paper transport type document reading device that uses a feed roller to feed paper to or eject paper from the reading unit, a temperature sensor is installed near the feed roller, and the temperature sensor detects the temperature. A paper conveyance control method for a document reading device, characterized in that a paper feed control amount of a feed roller is corrected based on temperature.
【請求項2】  請求項1において、予め送りローラの
用紙送り制御量と実際の用紙送り量との間の差を調べ、
用紙送り制御量を初期補正しておくことを特徴とする原
稿読取装置の用紙搬送制御方式。
2. According to claim 1, the difference between the paper feed control amount of the feed roller and the actual paper feed amount is checked in advance;
A paper conveyance control method for a document reading device, characterized in that a paper feed control amount is initially corrected.
JP3018265A 1991-01-18 1991-01-18 Paper carrier control system for original reader Pending JPH04236565A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3018265A JPH04236565A (en) 1991-01-18 1991-01-18 Paper carrier control system for original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3018265A JPH04236565A (en) 1991-01-18 1991-01-18 Paper carrier control system for original reader

Publications (1)

Publication Number Publication Date
JPH04236565A true JPH04236565A (en) 1992-08-25

Family

ID=11966839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3018265A Pending JPH04236565A (en) 1991-01-18 1991-01-18 Paper carrier control system for original reader

Country Status (1)

Country Link
JP (1) JPH04236565A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005082627A3 (en) * 2004-02-17 2005-10-20 Eastman Kodak Co Method and apparatus for image printer registration
JP2007053730A (en) * 2005-07-19 2007-03-01 Ricoh Co Ltd Image reading device
US7619788B2 (en) 2004-02-16 2009-11-17 Ricoh Co., Ltd. Document feeding and reading unit and image forming apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6181071A (en) * 1984-09-28 1986-04-24 Toshiba Corp Form carrying device
JPS61144371A (en) * 1984-12-19 1986-07-02 Konishiroku Photo Ind Co Ltd Recording apparatus
JPH01233958A (en) * 1988-03-15 1989-09-19 Canon Inc Sheet feeding method for recorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6181071A (en) * 1984-09-28 1986-04-24 Toshiba Corp Form carrying device
JPS61144371A (en) * 1984-12-19 1986-07-02 Konishiroku Photo Ind Co Ltd Recording apparatus
JPH01233958A (en) * 1988-03-15 1989-09-19 Canon Inc Sheet feeding method for recorder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7619788B2 (en) 2004-02-16 2009-11-17 Ricoh Co., Ltd. Document feeding and reading unit and image forming apparatus
WO2005082627A3 (en) * 2004-02-17 2005-10-20 Eastman Kodak Co Method and apparatus for image printer registration
US6999108B2 (en) 2004-02-17 2006-02-14 Eastman Kodak Company Method and apparatus for image registration improvements in a printer having plural printing stations
JP2007053730A (en) * 2005-07-19 2007-03-01 Ricoh Co Ltd Image reading device

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