JPH0545497B2 - - Google Patents
Info
- Publication number
- JPH0545497B2 JPH0545497B2 JP56152554A JP15255481A JPH0545497B2 JP H0545497 B2 JPH0545497 B2 JP H0545497B2 JP 56152554 A JP56152554 A JP 56152554A JP 15255481 A JP15255481 A JP 15255481A JP H0545497 B2 JPH0545497 B2 JP H0545497B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- recording paper
- paper feed
- feed roller
- recording
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 25
- 238000000926 separation method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 210000000078 claw Anatomy 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 4
- 108091008695 photoreceptors Proteins 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/18—Modifying or stopping actuation of separators
Landscapes
- Controlling Sheets Or Webs (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Description
【発明の詳細な説明】
本発明は、複写装置等における給紙装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in a copying machine or the like.
従来から種々の給紙装置が開発され実用化され
ているが、現実にはどの従来装置によつても確実
な紙分離及び給送を行えず、記録紙の多重給送が
しばしば発生している。多重給送は紙づまり等の
トラブルをも引き起こすため、その解決が急がれ
ているが、複写等の記録のスピードアツプに伴な
う給紙の高速化という状況の下で、多重給送防止
を達成することは容易なことではない。 Various paper feeding devices have been developed and put into practical use, but in reality, none of the conventional devices can separate and feed paper reliably, and multiple feeding of recording paper often occurs. . Multi-feeding also causes problems such as paper jams, so there is an urgent need to solve this problem.However, as paper feeding becomes faster due to faster recording such as copying, it is necessary to prevent multi-feeding. Achieving this is not an easy task.
本発明はこのような状況下で上記の要求に答え
るためになされたもので、
給紙トレイ内の最上位の記録紙に接触し、該記
録紙を給送する第１給紙ローラと、該第１給紙ロ
ーラとの間隔が記録紙の長さより短く選ばれ、且
つ該第１給紙ローラと同一のタイミングで駆動さ
れ、該第１給紙ローラにより給送されてきた記録
紙を更に後段に送出するローラであつて、記録紙
との間の摩擦係数μRPが記録紙間の摩擦係数μPPよ
り大きい第２給紙ローラと、該第２給紙ローラに
到達した記録紙の裏面側に接触する部材であつ
て、記録紙との間の摩擦係数μPFがμRP＞μPF＞μPP
である摩擦部材と、前記第１給紙ローラとの間隔
が記録紙の長さより長く選ばれ、且つ前記第２給
紙ローラ側より送られてきた記録紙を感光体側に
排出する最終給紙ローラと、前記第２給紙ローラ
側から送られてくる記録紙の先端が、回転停止中
の前記最終給紙ローラに当接しているときに、記
録紙に一定の方向にループを形成させるループ形
成手段と、該ループ形成手段により形成されたル
ープを検知するループ検知用センサと、前記最終
給紙ローラと前記第２給紙ローラとの間の位置で
あつて、前記記録紙のループを前記ループ検知用
センサが検知した時に記録紙の後端がまだ到達し
ない位置に配置された、第１及び第２記録紙検知
用センサと、給紙スタート信号で第１及び第２給
紙ローラの回転を開始し、前記ループ検知用セン
サがループを検知する毎に前記第１及び第２給紙
ローラの回転を停止させ、搬送開始信号を受ける
毎に前記最終給紙ローラを回転させて記録紙を感
光体側に排出させ、前記第１又は第２記録紙検知
用センサが記録紙の後端の通過を検知した時に、
前記第１及び第２給紙ローラの回転を再開する制
御部とを具備し、前記最終給紙ローラと前記第２
給紙ローラとの間に位置する前記第１及び第２記
録紙検知用センサの位置関係は、第２記録紙検知
用センサの方が前記第１記録紙検知用センサより
も最終給紙ローラ側になつており、前記制御部
は、正常な給紙の場合には、前記第１記録紙検知
用センサが記録紙の後端の通過を検知した時に前
記第１及び第２給紙ローラの回転を再開させ、多
重給送状態が生じた場合には、前記第２記録紙検
知用センサが記録紙の後端の通過を検知した時に
前記第１及び第２給紙ローラの回転を再開させる
ことを特徴とし、これにより、紙分離と、適切な
間隔での給送を行えるようにしたものである。 The present invention was made in order to meet the above requirements under such circumstances, and includes a first paper feed roller that contacts the topmost recording paper in the paper feed tray and feeds the recording paper, and a The distance between the first paper feed roller and the recording paper is selected to be shorter than the length of the recording paper, and the roller is driven at the same timing as the first paper feed roller, and the recording paper fed by the first paper feed roller is transferred to a later stage. A second paper feed roller, which is a roller that feeds the recording paper and whose friction coefficient μ RP is larger than the friction coefficient μ PP between the recording paper, and the back side of the recording paper that has reached the second paper feed roller. The friction coefficient μ PF between the member that comes into contact with the recording paper and the recording paper is μ RP > μ PF > μ PP
a final paper feed roller in which the distance between the friction member and the first paper feed roller is selected to be longer than the length of the recording paper, and which discharges the recording paper fed from the second paper feed roller side to the photoreceptor side; and loop formation in which the recording paper forms a loop in a certain direction when the leading edge of the recording paper fed from the second paper feeding roller side is in contact with the final paper feeding roller whose rotation is stopped. a loop detection sensor configured to detect a loop formed by the loop forming means; The first and second recording paper detection sensors are arranged at positions where the trailing edge of the recording paper has not yet reached when the detection sensor detects the detection, and the first and second paper feed rollers are rotated by a paper feed start signal. The rotation of the first and second paper feed rollers is stopped each time the loop detection sensor detects a loop, and the final paper feed roller is rotated each time a conveyance start signal is received to expose the recording paper to light. When the recording paper is ejected to the body side and the first or second recording paper detection sensor detects passage of the trailing edge of the recording paper,
a control unit that restarts the rotation of the first and second paper feed rollers, and a control unit that restarts the rotation of the first and second paper feed rollers;
The positional relationship between the first and second recording paper detection sensors located between the paper feed roller is such that the second recording paper detection sensor is closer to the final paper feed roller than the first recording paper detection sensor. In the case of normal paper feeding, the control unit controls the rotation of the first and second paper feeding rollers when the first recording paper detection sensor detects passage of the trailing edge of the recording paper. and restarting the rotation of the first and second paper feeding rollers when the second recording paper detection sensor detects passage of the trailing edge of the recording paper if a multiple feeding state occurs. This feature enables paper separation and paper feeding at appropriate intervals.
以下、図面を参照して本発明を詳細に説明す
る。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図は本発明に係る給紙装置の一実施例を示
す構成図で、図中、１は記録紙２が収納されてい
る給紙トレイ、３は爪分離機構、４はモータ５に
よつて駆動されるゴム製の第１給紙ローラであ
る。給紙トレイ１内の最上位の記録紙２は、常
時、第１給紙ローラ４に接触するように構成され
ている。６は一方向クラツチ（図示せず）を介し
てモータ７の動力伝達を受け駆動されるゴム製の
第２給紙ローラ、８はウレタン合成皮革、ネオブ
レンゴム、シリコンゴム等からなる摩擦板で、第
２給紙ローラ６に到達した記録紙２の裏面に接触
するものである。９及び１０は記録紙検知用セン
サとして機能するフオトデイテクタで、記録紙２
に向けて投光する投光部と、紙面からの反射光を
受光する受光部とから成る。１１は一方向クラツ
チ（図示せず）を介してモータ１２の動力伝達を
受け駆動されるゴム製の第３給紙ローラ、１３は
第３給紙ローラ１２によつて駆動させる従動ロー
ラである。更に、１４はアクチユエータ１４ａを
有するマイクロスイツチ、１５は上側ガイド、１
６は下側（落下防止用）である。これらガイド１
５及び１６は、ループ形成手段を構成するもの
で、記録紙２が最終給紙ローラ１７に当接してい
るときに、一定の方向にループを形成させるよう
に配意されている。１７はモータ１８によつて駆
動されるゴム製の最終給紙ローラ、１９は最終給
紙ローラ１７によつて駆動される従動ローラであ
る。マイクロスイツチ１４は、ループ検知用セン
サとして機能するもので、記録紙２が最終給紙ロ
ーラ１７に当接し、ループを形成すると、そのル
ープを検知するセンサである。又、モータ５，
７，１２及び１８は、複写装置等の制御部により
駆動され、フオトデイテクタ９及び１０並びにマ
イクロスイツ１４等の出力信号は、上記制御部に
送られるようになつており、各給紙ローラ４，
６，１１及び１７によつて、記録紙２は点線で示
す給紙経路２０を移送される。 FIG. 1 is a configuration diagram showing one embodiment of a paper feeding device according to the present invention. This is a first paper feed roller made of rubber and driven by the roller. The uppermost recording paper 2 in the paper feed tray 1 is configured to be in contact with the first paper feed roller 4 at all times. Reference numeral 6 denotes a second paper feed roller made of rubber, which is driven by receiving power from a motor 7 via a one-way clutch (not shown); 8 is a friction plate made of urethane synthetic leather, neoprene rubber, silicone rubber, etc.; 2. This contacts the back surface of the recording paper 2 that has reached the paper feed roller 6. 9 and 10 are photodetectors that function as recording paper detection sensors;
It consists of a light projecting section that projects light toward the surface of the paper, and a light receiving section that receives reflected light from the paper surface. Reference numeral 11 designates a third paper feed roller made of rubber which is driven by receiving power from a motor 12 via a one-way clutch (not shown), and reference numeral 13 indicates a driven roller driven by the third paper feed roller 12. Furthermore, 14 is a micro switch having an actuator 14a, 15 is an upper guide, and 1
6 is the lower side (for fall prevention). These guides 1
Reference numerals 5 and 16 constitute a loop forming means, which is arranged to form a loop in a fixed direction when the recording paper 2 is in contact with the final paper feed roller 17. Reference numeral 17 denotes a final paper feeding roller made of rubber, which is driven by a motor 18; and 19, a driven roller driven by the final paper feeding roller 17. The micro switch 14 functions as a loop detection sensor, and is a sensor that detects a loop when the recording paper 2 comes into contact with the final paper feed roller 17 and forms a loop. Moreover, the motor 5,
7, 12, and 18 are driven by a control section of a copying machine or the like, and output signals from photodetectors 9 and 10, micro switch 14, etc. are sent to the control section, and each paper feed roller 4,
6, 11, and 17, the recording paper 2 is transported along a paper feed path 20 shown by a dotted line.
尚、第２給紙ローラ６、摩擦板８、記録紙２間
における摩擦係数は(1)式の関係が成り立つように
選定されている。 Incidentally, the coefficient of friction between the second paper feed roller 6, the friction plate 8, and the recording paper 2 is selected so that the relationship expressed by equation (1) holds.
μRP＞μPF＞μPP (1)
但し、
μRP…ローラ６と記録紙２との摩擦係数
μPF…記録２と摩擦板８との摩擦係数
μPP…記録紙２間の摩擦係数
上記構成の給紙装置は、例えば第２図に示すよ
うに、複写装置や記録装置の一部を形成する。こ
こに例示した装置は、光学部２１、感光体ドラム
２２、帯電電極２３、現像部２４、転写電極２
５、分離電極２６、クリーニング除電極２７、ク
リーニング部２８、搬送部２９、定着部３０等を
有する公知の電子写真法を用いた複写装置又は記
録装置で、複写又は記録済みの記録紙は、搬送ロ
ーラ群３１により排紙トレイ３２に送られるよう
になつている。 μ RP > μ PF > μ PP (1) However, μ RP ...Coefficient of friction between roller 6 and recording paper 2, μ PF ...Coefficient of friction between record 2 and friction plate 8, μ PP ...Coefficient of friction between paper 2, above The paper feeding device of this configuration forms part of a copying device or a recording device, as shown in FIG. 2, for example. The device illustrated here includes an optical section 21, a photoreceptor drum 22, a charging electrode 23, a developing section 24, and a transfer electrode 2.
5. A copying device or a recording device using a known electrophotographic method, which has a separation electrode 26, a cleaning removal electrode 27, a cleaning section 28, a conveyance section 29, a fixing section 30, etc., and the recording paper that has been copied or recorded is conveyed. The paper is sent to a paper discharge tray 32 by a roller group 31.
次に、本発明の給紙装置の作動について、第３
図及至第６図を参照して説明する。 Next, we will discuss the operation of the paper feeding device of the present invention in the third section.
This will be explained with reference to the figures to FIG.
尚、第３図及び第４図は給送状態の説明図で両
図において、装置を構成するモータ等は省略され
ており、各符号は第１図と同一意味で用いられて
いる。又、第５図及び第６図のタイミングチヤー
トにおける1，2は、それぞれ、給紙スタート
信号、感光体ドラムへの搬送スタート信号（最終
給紙ローラ１７を駆動開始する信号で、転写タイ
ミングの同期をとつて送出される信号）である。
又、R4，R6，R11及びR17は、それぞれローラ４，
６，１１及び１７の駆動信号を示し、D9，D10及
びD14は、それぞれフオトデイテクタ９，１０及
びマイクロスイツチ１４の出力信号を示してい
る。 Incidentally, FIGS. 3 and 4 are explanatory diagrams of the feeding state, and in both figures, motors and the like constituting the apparatus are omitted, and each reference numeral is used with the same meaning as in FIG. 1. 1 and 2 in the timing charts of FIGS. 5 and 6 are respectively a paper feeding start signal and a conveyance start signal to the photosensitive drum (a signal to start driving the final paper feeding roller 17, which synchronizes the transfer timing. (a signal sent out by taking the signal).
Moreover, R 4 , R 6 , R 11 and R 17 are respectively roller 4,
6, 11 and 17 are shown, and D 9 , D 10 and D 14 are the output signals of photodetectors 9, 10 and microswitch 14, respectively.
先ず、給紙トレイ１からの記録紙２ａ，２ｂ，
…が、爪分離機構３によつて確実に分離され、順
次給送される場合について、第３図及び第５図を
参照して説明する。 First, recording paper 2a, 2b,
. . are reliably separated by the claw separation mechanism 3 and sequentially fed, with reference to FIGS. 3 and 5.
(1) 給紙スタート信号1によつて、モータ５，
７の駆動が開始され、第１給紙ローラ４及び第
２給紙ローラ６が回転を始め、記録紙２ａの給
送が始まる（時刻ta1）。(1) By paper feed start signal 1 , motor 5,
7 is started, the first paper feed roller 4 and the second paper feed roller 6 begin to rotate, and feeding of the recording paper 2a begins (time ta 1 ).
(2) 記録紙２ａの先端が、フオトデイテクタ９の
位置を通過し（時刻ta2）、フオトデイテクタ１
０の位置に来た時、フオトデイテクタ１０の出
力信号D10がオンとなり、モータ１２が駆動さ
れ第３給紙ローラ１１が回転を始める（時刻
ta3）。(2) The leading edge of the recording paper 2a passes the photodetector 9 (time ta 2 ), and the photodetector 1
0 position, the output signal D10 of the photodetector 10 is turned on, the motor 12 is driven, and the third paper feed roller 11 starts rotating (at the time
ta3 ).
(3) 記録紙２ａの先端が、最終給送ローラ１７に
当接し、その動きが規制され、ループが形成さ
れてマイクロスイツチ１４のアクチユエータ１
４ａがこれを検出し、信号D14がオンとなり、
第１、第２及び第３給紙ローラ４，６及び１１
が回転を停止する（時刻ta4）。尚、この作動の
後半（各ローラ回転停止直前）において、記録
紙２ａの後端がすでに給紙トレイ１から離れ、
次に給送される記録紙２ｂが第１給紙ローラ４
に送り出され、その先端が、第２給紙ローラ６
の近傍に到達している。第３図は、第１、第２
及び第３給紙ローラ４，６，１１が停止した状
態、即ち、時刻ta4の状態を示している。この
とき、記録紙２ｂの先端とフオトデイテクタ９
との距離はl1（第３図）になつている。又、第
１給紙ローラ４と記録紙２ａ後端との距離をla
とし、給紙トレイ１にスタツクされている記録
紙２の先端と第１給紙ローラ４との距離をltと
すれば、記録紙２ａと２ｂのオーバーラツプ量
はltに等しく、第１給紙ローラ４から記録紙２
ｂの先端までの距離はla＋ltになつている。(3) The leading edge of the recording paper 2a contacts the final feeding roller 17, its movement is regulated, a loop is formed, and the actuator 1 of the micro switch 14 is
4a detects this, signal D 14 turns on,
First, second and third paper feed rollers 4, 6 and 11
stops rotating (time ta 4 ). In addition, in the latter half of this operation (just before each roller stops rotating), the rear end of the recording paper 2a has already left the paper feed tray 1.
The recording paper 2b to be fed next is fed to the first paper feed roller 4.
The leading edge of the sheet is fed to the second paper feed roller 6.
It has reached the vicinity of . Figure 3 shows the first and second
This shows the state where the third paper feed rollers 4, 6, and 11 are stopped, that is, the state at time ta4 . At this time, the leading edge of the recording paper 2b and the photodetector 9
The distance between the two is l 1 (Figure 3). Also, the distance between the first paper feed roller 4 and the rear edge of the recording paper 2a is set to la.
If the distance between the leading edge of the recording paper 2 stacked in the paper feed tray 1 and the first paper feed roller 4 is lt, the amount of overlap between the recording papers 2a and 2b is equal to lt, and the distance between the leading edge of the recording paper 2 stacked on the paper feed tray 1 and the first paper feed roller 4 is equal to lt, 4 to recording paper 2
The distance to the tip of b is la + lt.
(4) 搬送開始信号2によつて、モータ１８が駆
動されて最終給紙ローラ１７が回転を始め（時
刻ta5）、ループが消え、マイクロスイツチ１４
のアクチユエータ１４ａが元の位置に戻り、信
号D14がオフとなる（時刻ta6）
(5) 記録紙２ａの後端が、フオトデイテクタ９の
位置に来た時、信号D9がオフとなつて、第１
給紙ローラ４及び第２給紙ローラ６が回転を始
め、記録紙２ｂの給送が開始される（時刻
ta7）。したがつて、記録紙２ａと記録紙２ｂ
は、フオトデイテクタ９の位置と停止状態にあ
る記録紙２ｂの先端との距離l1（既述、第３図
参照）をもつて移動を開始する。(4) The motor 18 is driven by the conveyance start signal 2 , and the final paper feed roller 17 starts rotating (time ta 5 ), the loop disappears, and the micro switch 14
actuator 14a returns to its original position and signal D14 turns off (time ta 6 ) (5) When the rear end of recording paper 2a reaches the position of photodetector 9, signal D9 turns off. , 1st
The paper feed roller 4 and the second paper feed roller 6 start rotating, and feeding of the recording paper 2b starts (at the time
ta7 ). Therefore, the recording paper 2a and the recording paper 2b
starts moving at a distance l 1 (described above, see FIG. 3) between the position of the photodetector 9 and the leading edge of the recording paper 2b which is in a stopped state.
(6) 記録紙２ｂの先端がフオトデイテクタ９の位
置に来て信号D9がオンとなり（時刻ta8）、記録
紙２ａの後端がフオトデイテクタ１０の位置に
来て信号D10がオフとなる（時刻ta9）。(6) The leading edge of the recording paper 2b comes to the position of the photodetector 9 and the signal D 9 turns on (time ta 8 ), and the rear end of the recording paper 2a comes to the position of the photodetector 10 and the signal D 10 turns off (time ta 8 ). Time ta 9 ).
(7) 以後、給送停止指令が発せられるまで、上記
時刻ta3及至ta9の各作動が時刻ta10（時刻ta3に
対応、以下同様）以降繰り返して行われる（第
５図にはta14までの作動を示した）。(7) Thereafter, each operation from time ta 3 to ta 9 described above is repeated from time ta 10 (corresponding to time ta 3 , the same applies hereinafter) until a feeding stop command is issued (Fig. 5 shows ta 14 ).
次に、爪分離機構３の不具合によつて、紙２ａ
及び２ｂが分離されずに重なり合つた状態で給送
された場合（以下、この状態を重送状態と呼ぶ）
について、第４図及び第６図を参照し説明する。 Next, due to a malfunction in the claw separation mechanism 3, the paper 2a
and 2b are fed in an overlapping state without being separated (hereinafter, this state is referred to as a double feeding state)
will be explained with reference to FIGS. 4 and 6.
(1) 給紙スタート信号1によつて、第１給紙ロ
ーラ４及び第２給紙ローラ６が回転を始め、第
４図Ａに示すように記録紙２ａ及び２ｂの重送
状態での給送が開始される（時刻tb1）。(1) In response to the paper feed start signal 1 , the first paper feed roller 4 and the second paper feed roller 6 start rotating, and the recording paper 2a and 2b are fed in a double feed state as shown in FIG. transmission is started (time tb 1 ).
(2) 記録紙２ａ及び２ｂの先端が、第２給紙ロー
ラ６の位置に来ると、第２給紙ローラ６、摩擦
板８、記録紙２ａ，２ｂには、(1)式の関係が成
り立つため、第４図Ｂに示すように、、記録紙
２ｂの給送は、摩擦板８によつて停止され、記
録紙２ａのみが給送され、その先端がフオトデ
イテクタ９の位置を通過（時刻tb2）し、フオ
トデイテクタ１０の位置に来た時、フオトデイ
テクタ１０の信号D10がオンとなり、第３給紙
ローラ１１が回転を始める（時刻tb3）。(2) When the leading ends of the recording papers 2a and 2b reach the position of the second paper feed roller 6, the relationship of equation (1) is established between the second paper feed roller 6, the friction plate 8, and the recording papers 2a and 2b. Therefore, as shown in FIG. 4B, the feeding of the recording paper 2b is stopped by the friction plate 8, and only the recording paper 2a is fed, and its leading edge passes the position of the photodetector 9 (at the time tb 2 ), and when it reaches the position of the photodetector 10, the signal D 10 of the photodetector 10 is turned on, and the third paper feed roller 11 starts rotating (time tb 3 ).
(3) 記録紙２ａの先端が搬送ローラ１７に当接
し、その動きが規制され、ループが形成されて
マイクロスイツチ１４のアクチユエータ１４ａ
がこれを検出し、信号D14がオンとなり、第
１、第２及び第３給紙ローラ４，６及び１１の
回転が停止される（時刻tb4）。この作動の後半
（給紙ローラ４，６及び１１の回転が停止する
直前）において、第４図Ｄ及び第４図Ｅに示す
ように、記録紙２ａの後端が第１給紙ローラ４
を通過すると、第１給紙ローラ４は、直接、記
録紙２ｂに接触し、それまで、摩擦板８によつ
て停止させられていた記録紙２ｂが再び移送さ
れ、第１、第２及び第３の給紙ローラ４，６及
び１１が停止する時刻tb4には、第４図Ｃに示
す状態になる。このとき、記録紙２ｂの先端と
フオトデイテクタ１０との距離はl2〔第４図Ｃ〕
になつている。又、前記laを用いれば、記録紙
２ｂの先端は、第２給紙ローラ６をlaだけ越え
た位置にある。更に、このときの記録紙２ａと
２ｂのオーバーラツプ量は、第１及び第２給紙
ローラ４，６の間隔lbにほぼ等しい。(3) The leading edge of the recording paper 2a contacts the conveyance roller 17, its movement is regulated, a loop is formed, and the actuator 14a of the micro switch 14 is
detects this, the signal D 14 is turned on, and the rotation of the first, second, and third paper feed rollers 4, 6, and 11 is stopped (time tb 4 ). In the latter half of this operation (immediately before the rotation of the paper feed rollers 4, 6, and 11 stops), as shown in FIGS.
, the first paper feed roller 4 directly contacts the recording paper 2b, and the recording paper 2b, which had been stopped by the friction plate 8, is transported again, and the first paper feed roller 4 directly contacts the recording paper 2b. At time tb4 when the paper feed rollers 4, 6 and 11 of No. 3 stop, the state shown in FIG. 4C is reached. At this time, the distance between the leading edge of the recording paper 2b and the photodetector 10 is l 2 [Figure 4C]
It's getting old. Furthermore, if the above-mentioned la is used, the leading edge of the recording paper 2b is located beyond the second paper feed roller 6 by la. Furthermore, the amount of overlap between the recording sheets 2a and 2b at this time is approximately equal to the distance lb between the first and second paper feed rollers 4 and 6.
(4) 搬送開始信号2によつて、搬送ローラ１７
が回転を始め（時刻tb5）、ループが消えて、マ
イクロスイツチ１４のアクチユエータ１４ａが
元の位置に戻り、信号D14がオフになる（時刻
tb6）。(4) By the conveyance start signal 2 , the conveyance roller 17
starts rotating (time tb 5 ), the loop disappears, the actuator 14a of the micro switch 14 returns to its original position, and the signal D 14 turns off (time tb 5 ).
tb6 ).
(5) 記録紙２ａの後端が、フオトデイテクタ９の
位置に来ても、記録紙２ｂがあるため、信号
D9は変化しない（時刻tb7）。記録紙２ａの後端
がフオトデイテクタ１０の位置に来た時、信号
D10がオフとなる（時刻tb8）。制御部は、この
時刻tb5〜tb8間における信号2，D9，D10及び
D14に基づき、時刻tb3の信号D10のオフ信号に
よつて、信号R4及びR6をオンにし第１及び第
２給紙ローラ４及び６を回転させる。このた
め、記録紙２ａ及び２ｂは、フオトデイテクタ
１０の位置と停止状態にある記録紙２ｂの先端
との距離l2（既述、第４図Ｃ参照）をもつて、
移動を始める。したがつて、上記l1とl2が等し
くなるように構成しておけば、爪分離機構３が
確実に動作したときと、多重送りのときの給紙
間隔を、等しくできる。(5) Even when the trailing edge of the recording paper 2a reaches the position of the photodetector 9, the signal cannot be detected because the recording paper 2b is present.
D 9 does not change (time tb 7 ). When the trailing edge of the recording paper 2a comes to the position of the photodetector 10, the signal
D10 is turned off (time tb8 ). The control unit controls the signals 2 , D9 , D10 and
Based on D14 , the signals R4 and R6 are turned on by the off signal of the signal D10 at time tb3 , and the first and second paper feed rollers 4 and 6 are rotated. For this reason, the recording papers 2a and 2b have a distance l 2 (already described, see FIG. 4C) between the position of the photodetector 10 and the leading edge of the recording paper 2b in the stopped state.
Start moving. Therefore, if the above-mentioned l 1 and l 2 are configured to be equal, the paper feeding interval can be made equal when the claw separation mechanism 3 operates reliably and when multiple feeding is performed.
(6) 記録紙２ｂの先端がフオトデイテクタ１０の
位置に来た時、信号D10がオンになり（時刻
tb9）、第６図の時刻tb10〜tb20にも示されてい
るように、第５図における時刻ta3以降と同様
な作動が行われる。したがつて、本発明装置
は、給紙トレイ１から記録紙２が重送状態で移
動を開始しても、最終給紙ローラ１７から感光
体ドラム２２へは、重送状態を解消した記録紙
が給送される。(6) When the leading edge of the recording paper 2b reaches the position of the photodetector 10, the signal D10 turns on (the time
tb 9 ), and as shown at times tb 10 to tb 20 in FIG. 6, the same operation as after time ta 3 in FIG. 5 is performed. Therefore, in the apparatus of the present invention, even if the recording paper 2 starts to move from the paper feed tray 1 in a double-feed state, the recording paper that has cleared the double-feed state is transferred from the final paper feed roller 17 to the photoreceptor drum 22. will be delivered.
尚、上記実施例におけるフオトデイテクタ９
は、第１及び第２給紙ローラ４，６の駆動タイミ
ングを早め、記録紙２の給紙間隔を小さくする働
きをするものであり、これを省略すれば、第１及
び第２給紙ローラ４，６の駆動タイミングはta7
ではなく、フオトデイテクタ１０がオフになるタ
イミングta9になる。但し、この場合には、重送
時の給送間隔は、正常時の間隔と異なることにな
る。又、上記実施例は、第２の給紙ローラ６とフ
オトデイテクタ９との間隔をlc（第３図参照）と
したとき、lb＞la＞lcなる関係が成り立つ場合の
ものであり、第５図及び第６図のタイムチヤート
もその動作を示しているが、このような条件は本
発明の成立に必須ではない。更に、第３給紙ロー
ラ１１、モータ１２、従動ローラ１３を用いず
に、第７図に示す如く、ガイド３５，３６を用い
て構成することもできる。又、第７図に併せて示
したように、摩擦板８に代えて、摩擦ローラ３７
を用いても良い。更に爪分離機構３については、
必ずしも用いる必要はない。又、上記実施例で
は、センサとしてフオトデイテクタ及びマイクロ
スイツチを第１図の如く用いたが、透過タイプの
フオトデイテクタ等も使用でき、各検知位置にお
いて、それぞれ異なつた検知手段を選択すること
もできる。 Note that the photodetector 9 in the above embodiment
functions to advance the driving timing of the first and second paper feed rollers 4 and 6 and to reduce the paper feeding interval of the recording paper 2. If this is omitted, the first and second paper feed rollers The drive timing of 4 and 6 is ta 7
Instead, the photodetector 10 turns off at timing ta 9 . However, in this case, the feeding interval during double feeding will be different from the normal feeding interval. Furthermore, the above embodiment is for the case where the relationship lb>la>lc holds true when the distance between the second paper feed roller 6 and the photodetector 9 is lc (see FIG. 3), and as shown in FIG. Although the time chart in FIG. 6 also shows the operation, such conditions are not essential for the realization of the present invention. Furthermore, instead of using the third paper feed roller 11, motor 12, and driven roller 13, it is also possible to use guides 35 and 36 as shown in FIG. Also, as shown in FIG. 7, a friction roller 37 is used instead of the friction plate 8.
You may also use Furthermore, regarding the claw separation mechanism 3,
It is not necessary to use it. Further, in the above embodiment, a photodetector and a microswitch are used as sensors as shown in FIG. 1, but a transmission type photodetector or the like can also be used, and different detection means can be selected at each detection position.
以上説明したように、本発明によれば、給紙ト
レイから送られてくる記録紙の重送状態を解消し
て感光体側に送ることができる。したがつて、紙
分離及び給送は確実になされ、多重給送を原因と
するジヤム発生を無くすことができる。また、常
に、略一定の間隔で記録紙を給送できるため、ジ
ヤム等を防止して、所定の処理（コピー等）を確
実に実行できる。 As described above, according to the present invention, it is possible to eliminate the double feeding state of recording sheets fed from the paper feed tray and send them to the photoreceptor side. Therefore, paper separation and feeding can be performed reliably, and jams caused by multiple feeding can be eliminated. Furthermore, since the recording paper can always be fed at substantially constant intervals, jams and the like can be prevented and predetermined processes (such as copying) can be reliably executed.
第１図は本発明に係る給紙装置の一実施例を示
す構成図、第２図は本発明による給紙装置の配置
状態の一例を示す図、第３図及び第４図は本発明
装置の作動状態説明図、第５図及び第６図はタイ
ムチヤート、第７図は本発明の他の実施例を示す
構成図である。
１……給紙トレイ、２……記録紙、３……爪分
離機構、４……第１給紙ローラ、６……第２給紙
ローラ、８……摩擦板、９及び１０……フオトデ
イテクタ、１１……第３給紙ローラ、１４……マ
イクロスイツチ、１５及び１６……ガイド、１７
……最終給紙ローラ、５，７，１２，１８……モ
ータ、３５，３６……ガイド、３７……摩擦ロー
ラ。
FIG. 1 is a configuration diagram showing an embodiment of the paper feeding device according to the present invention, FIG. 2 is a diagram showing an example of the layout of the paper feeding device according to the present invention, and FIGS. 3 and 4 are diagrams showing the device of the present invention. 5 and 6 are time charts, and FIG. 7 is a configuration diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Paper feed tray, 2... Recording paper, 3... Claw separation mechanism, 4... First paper feed roller, 6... Second paper feed roller, 8... Friction plate, 9 and 10... Photo detector , 11... Third paper feed roller, 14... Micro switch, 15 and 16... Guide, 17
...Final paper feeding roller, 5, 7, 12, 18... Motor, 35, 36... Guide, 37... Friction roller.
Claims (1)
記録紙を給送する第１給紙ローラと、 該第１給紙ローラとの間隔が記録紙の長さより
短く選ばれ、且つ該第１給紙ローラと同一のタイ
ミングで駆動され、該第１給紙ローラにより給送
されてきた記録紙を更に後段に送出するローラで
あつて、記録紙との間の摩擦係数μRPが記録紙間
の摩擦係数μPPより大きい第２給紙ローラと、 該第２給紙ローラに到達した記録紙の裏面側に
接触する部材であつて、記録紙との間の摩擦係数
μPFがμRP＞μPF＞μPPである摩擦部材と、 前記第１給紙ローラとの間隔が記録紙の長さよ
り長く選ばれ、且つ前記第２給紙ローラ側より送
られてきた記録紙を感光体側に排出する最終給紙
ローラと、 前記第２給紙ローラ側から送られてくる記録紙
の先端が、回転停止中の前記最終給紙ローラに当
接しているときに、記録紙に一定の方向にループ
を形成させるループ形成手段と、 該ループ形成手段により形成されたループを検
知するループ検知用センサと、 前記最終給紙ローラと前記第２給紙ローラとの
間の位置であつて、前記記録紙のループを前記ル
ープ検知用センサが検知した時に記録紙の後端が
まだ到達しない位置に配置された、第１及び第２
記録紙検知用センサと、 給紙スタート信号で第１及び第２給紙ローラの
回転を開始し、前記ループ検知用センサがループ
を検知する毎に前記第１及び第２給紙ローラの回
転を停止させ、搬送開始信号を受ける毎に前記最
終給紙ローラを回転させて記録紙を感光体側に排
出させ、前記第１又は第２記録紙検知用センサが
記録紙の後端の通過を検知した時に、前記第１及
び第２給紙ローラの回転を再開する制御部とを具
備し、 前記最終給紙ローラと前記第２給紙ローラとの
間に位置する前記第１及び第２記録紙検知用セン
サの位置関係は、第２記録紙検知用センサの方が
前記第１記録紙検知用センサよりも最終給紙ロー
ラ側になつており、 前記制御部は、正常な給紙の場合には、前記第
１記録紙検知用センサが記録紙の後端の通過を検
知した時に前記第１及び第２給紙ローラの回転を
再開させ、多重給送状態が生じた場合には、前記
第２記録紙検知用センサが記録紙の後端の通過を
検知した時に前記第１及び第２給紙ローラの回転
を再開させることを特徴とする給紙装置。[Claims] 1. A first paper feed roller that contacts and feeds the uppermost recording paper in the paper feed tray, and a distance between the first paper feed roller and the recording paper that is longer than the length of the recording paper. A roller that is selected to be short and is driven at the same timing as the first paper feed roller, and sends the recording paper fed by the first paper feed roller to a later stage, and is a roller that is driven at the same timing as the first paper feed roller. A second paper feed roller whose friction coefficient μ RP is larger than the friction coefficient μ PP between the recording sheets, and a member that contacts the back side of the recording paper that has reached the second paper feed roller, and which is a member between the recording paper and the second paper feed roller. The distance between the friction member whose friction coefficient μ PF satisfies μ RP > μ PF > μ PP and the first paper feed roller is selected to be longer than the length of the recording paper, and the recording paper is fed from the second paper feed roller side. When the final paper feed roller that discharges the recorded paper to the photoconductor side and the leading edge of the recording paper fed from the second paper feed roller side are in contact with the final paper feed roller whose rotation is stopped, a loop forming means for forming a loop in a certain direction on the recording paper; a loop detection sensor for detecting the loop formed by the loop forming means; and a loop detection sensor for detecting the loop formed by the loop forming means; first and second positions arranged at positions where the trailing edge of the recording paper has not yet reached when the loop detection sensor detects the loop of the recording paper;
A recording paper detection sensor and a paper feed start signal start the rotation of the first and second paper feed rollers, and each time the loop detection sensor detects a loop, the rotation of the first and second paper feed rollers is started. and the final paper feed roller is rotated every time a conveyance start signal is received to discharge the recording paper toward the photoconductor, and the first or second recording paper detection sensor detects passage of the trailing edge of the recording paper. and a control unit that restarts the rotation of the first and second paper feed rollers, and detects the first and second recording paper located between the final paper feed roller and the second paper feed roller. The positional relationship of the sensors is such that the second recording paper detection sensor is closer to the final paper feed roller than the first recording paper detection sensor, and the control section , when the first recording paper detection sensor detects passage of the trailing edge of the recording paper, the rotation of the first and second paper feeding rollers is restarted, and when a multiple feeding state occurs, the second A paper feeding device characterized in that the rotation of the first and second paper feeding rollers is restarted when a recording paper detection sensor detects passage of a trailing edge of the recording paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15255481A JPS5859137A (en) | 1981-09-25 | 1981-09-25 | Paper feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15255481A JPS5859137A (en) | 1981-09-25 | 1981-09-25 | Paper feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5859137A JPS5859137A (en) | 1983-04-08 |
| JPH0545497B2 true JPH0545497B2 (en) | 1993-07-09 |
Family
ID=15542998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15255481A Granted JPS5859137A (en) | 1981-09-25 | 1981-09-25 | Paper feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5859137A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0684218B2 (en) * | 1984-03-02 | 1994-10-26 | 三田工業株式会社 | Copy paper feeder |
| JPS61238637A (en) * | 1985-04-15 | 1986-10-23 | Mita Ind Co Ltd | Image forming device |
| JPH04164752A (en) * | 1990-10-25 | 1992-06-10 | Mitsubishi Electric Corp | Copying machine |
| JP2653736B2 (en) * | 1991-10-31 | 1997-09-17 | 沖電気工業株式会社 | Paper suction control method for printer |
| JPH0633851U (en) * | 1992-10-02 | 1994-05-06 | ジューキ株式会社 | Sheet media separation and supply device |
| JPH06144651A (en) * | 1992-10-29 | 1994-05-24 | Nisca Corp | Sheet feeder |
| JP4377666B2 (en) * | 2003-12-04 | 2009-12-02 | ニスカ株式会社 | Sheet feeding apparatus and image reading apparatus |
| JP4469671B2 (en) | 2004-07-09 | 2010-05-26 | 株式会社東芝 | Paper sheet take-out device |
| JP2015105173A (en) * | 2013-11-29 | 2015-06-08 | 京セラドキュメントソリューションズ株式会社 | Image formation device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5242384A (en) * | 1975-09-30 | 1977-04-01 | Mitsubishi Electric Corp | Semiconductor device |
| JPS5340783A (en) * | 1976-09-24 | 1978-04-13 | Bayer Ag | Novel alkoxy substituted pyrimidinylthionophosphonic acid and use of same as pesticide and mitecide |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739392Y2 (en) * | 1978-06-08 | 1982-08-30 |
-
1981
- 1981-09-25 JP JP15255481A patent/JPS5859137A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5242384A (en) * | 1975-09-30 | 1977-04-01 | Mitsubishi Electric Corp | Semiconductor device |
| JPS5340783A (en) * | 1976-09-24 | 1978-04-13 | Bayer Ag | Novel alkoxy substituted pyrimidinylthionophosphonic acid and use of same as pesticide and mitecide |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5859137A (en) | 1983-04-08 |
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