JPS59102737A - Double feed preventive mechanism of sheet feeding device - Google Patents

Double feed preventive mechanism of sheet feeding device

Info

Publication number
JPS59102737A
JPS59102737A JP21207782A JP21207782A JPS59102737A JP S59102737 A JPS59102737 A JP S59102737A JP 21207782 A JP21207782 A JP 21207782A JP 21207782 A JP21207782 A JP 21207782A JP S59102737 A JPS59102737 A JP S59102737A
Authority
JP
Japan
Prior art keywords
roller
paper
torque
clutch
sheets
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
JP21207782A
Other languages
Japanese (ja)
Inventor
Masanori Yamanaka
山中 正徳
Hiroyasu Sumita
住田 浩康
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP21207782A priority Critical patent/JPS59102737A/en
Publication of JPS59102737A publication Critical patent/JPS59102737A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00Separating articles from piles
    • B65H3/46Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52Friction retainers acting on under or rear side of article being separated
    • B65H3/5246Driven retainers, i.e. the motion thereof being provided by a dedicated drive
    • B65H3/5253Driven retainers, i.e. the motion thereof being provided by a dedicated drive the retainers positioned under articles separated from the top of the pile
    • B65H3/5261Retainers of the roller type, e.g. rollers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

PURPOSE:To have always stable paper feeding performance, in an arrangement in which double feed is prevented by means of cooperation of a feed roller and a reverse roller, by furnishing a drive transmission means to change the torque of reverse roller and by controlling said means according to the format and type of the sheets of paper as well as the humidity condition etc. CONSTITUTION:A reverse roller 5 installed in the understream of a sheets feeder roller, not illustrated, which is to send off the sheets in stack one after another and which constitutes a distribution roller couple 3 together with a feed roller 4, is rotated by a chain 9 with the aid of a hysteresis clutch 7 as drive transmission means and an output sheet 7e. This hysteresis clutch 7 is so constructed that the torque borne increases proportional to the exciting current for an excitor coil 7h, so as to put the clutch 7 in engagement by the current from a rectifier 11 in compliance with a clutch-on signal S. Torque corresponding to this exciting current shall be generated by controlling a variable resistor 10 and thereby increasing or decreasing the exciting current.

Description

【発明の詳細な説明】 技術分野 本発明は複写機、印刷機等における給紙装置に関し、よ
り詳細には1枚ずつ送り出される積載紙の重送防止機構
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a paper feeding device for a copying machine, a printing machine, etc., and more particularly to a mechanism for preventing double feeding of stacked papers that are fed out one by one.

従来技術 従来より、積載紙を送り出す給紙ローラの下流側に、送
りローラと逆転ローラからなる捌きローラ対を設けたも
のは公知である。
BACKGROUND ART Conventionally, it has been known to provide a pair of separating rollers consisting of a feeding roller and a reversing roller on the downstream side of a paper feeding roller that sends out stacked sheets.

この逆転ローラはまた、給紙動作時、常に逆転している
もの、あるいは正常送り(1枚送り時)時は送りローラ
との圧接力により、逆転ローラの逆転方向のトルクに正
転方向の接線力が打ち勝って逆転ローラが正転方向に従
動されるが、重送時は逆転し、2枚目以降の紙を捌くも
のがある。
This reversing roller is also always in reverse during paper feeding operation, or during normal feeding (feeding one sheet), due to the pressure contact force with the feed roller, the torque in the reverse direction of the reversing roller is tangential to the normal rotation direction. The force is overcome and the reversing roller is driven in the forward rotation direction, but during double feeding, the reversing roller rotates in the reverse direction and sometimes separates the second and subsequent sheets of paper.

これらいずれの機構のものにおいても、従来は紙の種類
による捌き力(逆転ローラのトルク)の相違、あるいは
積載紙、捌きローラ対周辺の湿度条件の変化による紙と
紙の間の摩擦係数の違い等は配慮されていなかった。
In any of these mechanisms, conventionally, the separation force (torque of the reversing roller) differs depending on the type of paper, or the friction coefficient between the sheets differs due to changes in the loaded paper, the humidity conditions around the separation roller, etc. etc. were not taken into account.

即ち、複写機に用いられる紙としてはいわゆる普通紙の
外にザラ紙、第二原図紙、0HP(オーバーヘッドプロ
ジェクタ−)用フィルム・原紙等がある。
That is, in addition to so-called plain paper, paper used in copying machines includes rough paper, second original drawing paper, film/base paper for OHP (overhead projector), and the like.

これらはいずれも紙と紙の間の摩擦係数が同一外気条件
で異なるものであるから、逆転ローラのある設定トルク
に対して、すべての種類の紙が完全に捌かれるとは言い
難い。ちなみに厚紙・OHP用フィルム、普通紙・第二
原図紙・ザラ紙の順に摩擦係数は高くなる。従って例え
ば厚紙に最高な逆転トルク値であったとすると、ザラ紙
では捌かれないで重送してしまうということも考えられ
るし、逆にザラ紙に最適な逆転トルク値であったとする
と、厚紙では、捌きローラ対より下流側に紙が送られな
い、即ち不送りの状態が発生する危険性が生じていたの
である。
Since the coefficient of friction between these sheets differs under the same outside air conditions, it is difficult to say that all types of paper will be completely separated by a certain set torque of the reversing roller. Incidentally, the coefficient of friction increases in the order of cardboard, OHP film, plain paper, second original paper, and rough paper. Therefore, for example, if the reverse torque value is the best for thick paper, it is possible that rough paper will not be sorted and will be fed twice, and conversely, if the reverse torque value is the best for rough paper, then the reverse torque value for thick paper There was a risk that the paper would not be fed downstream from the pair of separating rollers, that is, a state of non-feeding would occur.

一方同一種類の紙であっても、外部の湿度条件によって
紙間の摩擦係数は大きく変わってくる。
On the other hand, even if the paper is of the same type, the coefficient of friction between the papers varies greatly depending on the external humidity conditions.

即ち、湿度が高ければ高い程、摩擦係数は増すのである
That is, the higher the humidity, the higher the coefficient of friction.

目   的 本発明は以上の様な背景に基づきなされたものであって
、多種類の紙に対し、あるいは多様な外部湿度条件に対
し、安定した給紙(1枚ずつ送り出す給紙)が行なえる
重送防止機構を提供するこ畢 とを目的とするものである。
Purpose The present invention has been made based on the above background, and is capable of stably feeding paper (feeding sheets one by one) for many types of paper or under various external humidity conditions. The purpose of this is to provide a mechanism for preventing double feeding.

構成 以下本発明の構成を図示の実施例に基づき説明する。composition The configuration of the present invention will be explained below based on the illustrated embodiments.

第1図は本発明に係る給紙装置の機構説明図である。FIG. 1 is a mechanical explanatory diagram of a paper feeding device according to the present invention.

図において1は猜載紙、2はこの積載紙1を最上紙から
1枚ずつ給紙する給紙ローラである。3は捌きローラ対
であり、送りローラ4と、この送りローラ4に圧接する
逆転ローラ5とからなる。
In the figure, reference numeral 1 denotes stacked sheets, and 2 denotes a paper feed roller that feeds the stacked sheets 1 one by one starting from the topmost sheet. Reference numeral 3 denotes a pair of separating rollers, which consists of a feed roller 4 and a reversing roller 5 that presses against the feed roller 4.

この逆転ローラ5は前述の如く、常時あるいは重送時に
逆転し得るようになっており、内部には後述するヒステ
リシスクラッチ(駆動伝達手段)を設けている。6は図
示してない感光体に紙を同期搬送させるためのレンジス
トローラ対である。
As described above, this reversing roller 5 is capable of reversing at all times or during double feeding, and is provided with a hysteresis clutch (drive transmission means) described later. Reference numeral 6 denotes a pair of range strollers for synchronously conveying paper to a photoreceptor (not shown).

第2図はヒステリシスクラッチ部分の紋所面図である。FIG. 2 is a plan view of the crest of the hysteresis clutch portion.

ヒステリシスクラッチ7は入力側のロータ7&、外磁極
7b、出力側のカップ7e、玉軸受7d。
The hysteresis clutch 7 includes a rotor 7& on the input side, an outer magnetic pole 7b, a cup 7e on the output side, and a ball bearing 7d.

出力軸7e、フランジ7f、内磁極7gs励磁コイル7
h、フィールド71.取付7ランジ7j。
Output shaft 7e, flange 7f, inner magnetic pole 7gs excitation coil 7
h, field 71. Installation 7 lunge 7j.

入力軸7kからなるものである。このヒステリシスクラ
ッチ7は公知のものであり、第3図に示すような特性を
有する。即ち、励磁電流に比例してトルクが増すように
なっているものである。再び第2図に戻り、8はチェー
ン9により外部からの駆動を受けろスジロケットであり
、入力軸7kに固定されている。ヒステリシスクラッチ
7がオンすると、この入力軸7にのトルクが出力軸7e
に伝達され、これによって、出力軸7eに取り付けられ
た逆転ローラ5のトルクが可変となるのである。
It consists of an input shaft 7k. This hysteresis clutch 7 is well known and has characteristics as shown in FIG. That is, the torque increases in proportion to the excitation current. Returning to FIG. 2 again, 8 is a linear rocket which is driven from the outside by a chain 9, and is fixed to the input shaft 7k. When the hysteresis clutch 7 is turned on, the torque on the input shaft 7 is applied to the output shaft 7e.
As a result, the torque of the reversing roller 5 attached to the output shaft 7e becomes variable.

第4図は、この様に構成されたヒステリシスクラッチ7
のトルクを可変とする回路の一実施例を示すものである
Figure 4 shows the hysteresis clutch 7 configured in this way.
This figure shows an example of a circuit that makes the torque of the motor variable.

図において10はスライダック、11は整流器、12は
トランジスタ、Sはクラッチオン信号であり、このクラ
ッチオン信号Sと、整流器11かもの電流により前記ヒ
ステリシスクラッチ7がオンし、且つ所定の駆動トルク
を発生することになる。
In the figure, 10 is a slider, 11 is a rectifier, 12 is a transistor, and S is a clutch-on signal. This clutch-on signal S and the current of the rectifier 11 turn on the hysteresis clutch 7 and generate a predetermined driving torque. I will do it.

この回路において、スライダック10を動かして、励磁
電流な増減させてやれば、ヒステリシスクラッチ7は、
この励磁電流に対応したトルクを発生させる。伺ヒステ
リシスクラッチ7に限らずAウダークラッチもこの様な
特性を持っている。
In this circuit, if the slider 10 is moved to increase or decrease the excitation current, the hysteresis clutch 7 will become
A torque corresponding to this exciting current is generated. Not only the hysteresis clutch 7, but also the A clutch has such characteristics.

第5図は、このスライダック10の調整摘みを示す平面
図である。指標板13には、pl  l Pl +P3
 1pn  +P5の5段階の指標部が付してあり、そ
れぞれ、ザラ紙、第二原図紙、普通紙、OHP用フィル
ム、厚紙に対応させている。調整摘み14はこの間を移
動するものであって、例えば、普通紙を使用する場合は
、ps位置にセットし、第二原図を使用する場合はP!
位置にセットすることになる。そうするとスライダック
10により励磁電流が調整され、各紙に対応したトルク
が発生される。
FIG. 5 is a plan view showing the adjustment knob of this slide duck 10. On the index plate 13, pl l Pl +P3
It is equipped with a five-level index section of 1 pn + P5, which corresponds to rough paper, second original paper, plain paper, OHP film, and cardboard. The adjustment knob 14 moves between these positions. For example, when using plain paper, set it to the ps position, and when using a second original, set it to the p! position.
It will be set in position. Then, the excitation current is adjusted by the slider 10, and a torque corresponding to each paper is generated.

励磁電流は前述した如く、P5→P、方向に増大し、ト
ルクを大きくする。
As described above, the exciting current increases in the direction P5→P, increasing the torque.

第6図は、紙種類データの外圧湿度データを考慮して、
ヒステリシスクラッチ7のトルクを設定するようにした
回路のブロック図である。
Figure 6 shows that considering the external pressure humidity data of the paper type data,
2 is a block diagram of a circuit configured to set the torque of the hysteresis clutch 7. FIG.

図において、15は湿度センサー、16はこの湿度セン
サー15からの信号をデジタル変換する7 ためのA / D変換器、17は各種の紙の専用カセッ
ト(図示せず)の選択データを入力するスイッチ群、1
8はA / D変換器16からの湿度信号とスイッチ群
17からの紙種類情報を取り込み、適正なトルク信号を
出力するためのCPU、19はこのCPUI 8からの
信号をアナログ変換するD/A変換器であり、最終的に
はこのD/A変換器19からの信号でヒステリシスクラ
ッチ7が駆動される。
In the figure, 15 is a humidity sensor, 16 is an A/D converter for digitally converting the signal from this humidity sensor 15, and 17 is a switch for inputting selection data of special cassettes (not shown) for various types of paper. group, 1
8 is a CPU that takes in the humidity signal from the A/D converter 16 and paper type information from the switch group 17 and outputs an appropriate torque signal, and 19 is a D/A that converts the signal from this CPU 8 into analog. The hysteresis clutch 7 is finally driven by a signal from the D/A converter 19.

効果 本発明は以上述べた如く、紙の種類、湿度条件等によっ
て逆転ローラの最適トルク値を設定するようにしたから
、いかなる状況のもとにおいても、常に安定した給紙性
能が得られる。
Effects As described above, in the present invention, the optimal torque value of the reversing roller is set depending on the type of paper, humidity conditions, etc., so that stable paper feeding performance can always be obtained under any circumstances.

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

第1図は本発明の前提となる給紙装置の簡略機構図、第
2図は一実施例に係る駆動伝達手段部分・ の縦断面図、第3図はその特性図、第4図は一実施例に
係る回路図、第5[図は操作部の平面図、第6図は他の
実施例に係るブロック図である。 1・・・積載紙、2・・・給紙ローラ、4・・・送りロ
ーラ、5・・・逆転ローラ、7・・・駆動伝達手段。 ナ1 z ブヨ図 μ)1石1ヒ繍EL(りン 7、<圀        才5昭 60
Fig. 1 is a simplified mechanical diagram of the paper feeding device that is the premise of the present invention, Fig. 2 is a longitudinal cross-sectional view of the drive transmission means according to one embodiment, Fig. 3 is its characteristic diagram, and Fig. 4 is a schematic diagram of the paper feeding device. Circuit diagram according to the embodiment, Figure 5 is a plan view of the operating section, and Figure 6 is a block diagram according to another embodiment. DESCRIPTION OF SYMBOLS 1... Loaded paper, 2... Paper feed roller, 4... Feed roller, 5... Reverse roller, 7... Drive transmission means. Na 1 z Gnat diagram μ) 1 stone 1 Hishi EL (Rin 7, <Kuni Sai 5 1986

Claims (1)

【特許請求の範囲】[Claims] 積載紙を送り出す給紙ローラと、この給紙ローラ下流側
に設けた送りローラと、この送りローラに圧接する重送
防止用の逆転ローラとを設けた給紙装置において、この
逆転ローラのトルクラ可変とする駆動伝達手段馨設け、
紙の種類、湿度条件等に応じて前記駆動伝達手段を制御
することにより、前記逆転ローラのトルク乞補正制御す
るようにしたこと乞特徴とする給紙装置の重送防止機構
In a paper feeding device equipped with a paper feed roller that sends out stacked paper, a feed roller provided downstream of this paper feed roller, and a reversing roller that presses against this feeding roller to prevent double feeding, the torque roller of this reversing roller is variable. A drive transmission means is provided,
A double-feed prevention mechanism for a paper feeding device, characterized in that torque compensation of the reversing roller is controlled by controlling the drive transmission means according to the type of paper, humidity conditions, etc.
JP21207782A 1982-12-04 1982-12-04 Double feed preventive mechanism of sheet feeding device Pending JPS59102737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21207782A JPS59102737A (en) 1982-12-04 1982-12-04 Double feed preventive mechanism of sheet feeding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21207782A JPS59102737A (en) 1982-12-04 1982-12-04 Double feed preventive mechanism of sheet feeding device

Publications (1)

Publication Number Publication Date
JPS59102737A true JPS59102737A (en) 1984-06-13

Family

ID=16616476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21207782A Pending JPS59102737A (en) 1982-12-04 1982-12-04 Double feed preventive mechanism of sheet feeding device

Country Status (1)

Country Link
JP (1) JPS59102737A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62205943A (en) * 1986-03-04 1987-09-10 Minolta Camera Co Ltd Automatic paper feeder
US7427061B2 (en) * 2006-09-21 2008-09-23 Xerox Corporation Retard feeder

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567847A (en) * 1979-06-27 1981-01-27 Savin Corp Sheet feeder
JPS5917432A (en) * 1982-07-16 1984-01-28 Tokyo Electric Co Ltd Sheet feeder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567847A (en) * 1979-06-27 1981-01-27 Savin Corp Sheet feeder
JPS5917432A (en) * 1982-07-16 1984-01-28 Tokyo Electric Co Ltd Sheet feeder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62205943A (en) * 1986-03-04 1987-09-10 Minolta Camera Co Ltd Automatic paper feeder
US7427061B2 (en) * 2006-09-21 2008-09-23 Xerox Corporation Retard feeder

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