JPH0377513B2 - - Google Patents
Info
- Publication number
- JPH0377513B2 JPH0377513B2 JP57024714A JP2471482A JPH0377513B2 JP H0377513 B2 JPH0377513 B2 JP H0377513B2 JP 57024714 A JP57024714 A JP 57024714A JP 2471482 A JP2471482 A JP 2471482A JP H0377513 B2 JPH0377513 B2 JP H0377513B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- separation
- timer
- transfer paper
- photoreceptor drum
- 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
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
- G03G15/70—Detecting malfunctions relating to paper handling, e.g. jams
- G03G15/706—Detecting missed stripping form xerographic drum, band or plate
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Controlling Sheets Or Webs (AREA)
- Paper Feeding For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は複写機における紙分離検知装置に関
し、確実な紙分離検知と、紙詰り時の処置を適確
に行なわせることを目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper separation detection device for a copying machine, and an object of the present invention is to ensure reliable paper separation detection and to appropriately take action in the event of a paper jam.
従来、感光体ドラムからの転写紙分離不良を検
知する手段として光学式センサを用いた方法が知
られている。つまり感光体ドラムに向けて発光
し、感光体ドラムからの反射光を受光して、その
反射光の強度に対応した電気信号に変換し、これ
を基準信号と比較することによつて分離不良を検
出していた。しかし、センサの発光部および受光
部には、トナーや紙粉が附着し易く、誤動作を起
こし易い。また前記分離不良検出回路も複雑とな
り、かつコストも高いという欠点を有していた。 Conventionally, a method using an optical sensor is known as a means for detecting defective separation of transfer paper from a photoreceptor drum. In other words, it emits light toward the photoreceptor drum, receives the reflected light from the photoreceptor drum, converts it into an electrical signal corresponding to the intensity of the reflected light, and compares this with a reference signal to detect poor separation. was detected. However, toner and paper powder tend to adhere to the light emitting section and the light receiving section of the sensor, which tends to cause malfunctions. Furthermore, the separation failure detection circuit also has the drawbacks of being complicated and costly.
本発明は前記従来の欠点を解決するもので、以
下にその実施例を図面にもとづいて説明する。 The present invention solves the above-mentioned conventional drawbacks, and embodiments thereof will be described below based on the drawings.
第１図に紙の流れに対する複写機の機能図を示
す。同図において、１は給紙ローラであり、コピ
ースタート信号によつて駆動され、給紙カセツト
２内蔵された最上側の紙が１枚送り出される。送
り出された紙はレジストローラ対３，３′の給紙
ローラ側に備えられた紙検出スイツチSW1によつ
て検出される。そして紙検出スイツチSW1の紙検
出によつて一定時間後に給紙ローラを停止し、そ
の紙先端がレジストローラ対３，３′に挾持され
た状態にする。そこで、感光体ドラム４のゼログ
ララフイー像が、この待機状態にある紙と重合す
る同期位置にくると、レジストローラ対３，３′
が回転し、紙わ転写装置５に送り込み、ここで紙
に現像像が転写される。その後、分離装置６によ
つて、感光体ドラム４と転写された紙が分離され
る。分離された紙は、紙搬送装置７によつて定着
装置８まで搬送され、定着装置８にて、紙に転写
像を定着させて排出し、複写動作が完了する。な
お、１８はクリーニング装置である。 FIG. 1 shows a functional diagram of a copying machine regarding the flow of paper. In the figure, reference numeral 1 denotes a paper feed roller, which is driven by a copy start signal and feeds out the uppermost sheet of paper contained in the paper feed cassette 2. The fed paper is detected by a paper detection switch SW1 provided on the paper feed roller side of the registration roller pair 3, 3'. Then, the paper feed roller is stopped after a certain period of time as a result of the paper detection by the paper detection switch SW1 , and the leading edge of the paper is held between the pair of registration rollers 3 and 3'. Then, when the xerographic image on the photosensitive drum 4 comes to the synchronous position where it overlaps with the paper in the standby state, the pair of registration rollers 3, 3'
rotates and feeds the paper into the paper transfer device 5, where the developed image is transferred to the paper. Thereafter, the photosensitive drum 4 and the transferred paper are separated by the separating device 6. The separated paper is transported by the paper transport device 7 to the fixing device 8, where the transferred image is fixed on the paper and then discharged, completing the copying operation. Note that 18 is a cleaning device.
ここで、感光体ドラム４と転写された紙の分離
の検出手段として、マイクロスイツチSW２を紙
搬送装置７に取付ける。このマイクロスイツチ
SW２はアクチユエータを有し、紙の重さのみで
動作、可能であり、機械の振動では動作しないよ
うな構造になつており、さらに構造的に少々のト
ナーや紙粉に対しては影響を受けないようになつ
ている。 Here, a micro switch SW2 is attached to the paper conveying device 7 as a means for detecting separation between the photosensitive drum 4 and the transferred paper. This micro switch
SW2 has an actuator and is able to operate using only the weight of the paper, and is structured so that it does not operate due to vibrations from the machine, and is structurally unaffected by small amounts of toner and paper dust. It seems like there is no such thing.
つぎに、マイクロスイツチSW２を用いた分離
の検出方法を述べる。レジストローラ対３，３′
の紙搬送速度およびレジストローラ対３，３′と
マイクロスイツチSW２との間の紙搬送距離を知
ることにより、レジストローラ対３，３′が駆動
後、紙がマイクロスイツチSW２まで到達する時
間がわかる。したがつて、レジストローラ対３，
３′の駆動時にタイマーを動作させ、一定時間中
にマイクロスイツチSW２がオンしたかどうかを
知ることにより、分離か分離不良かが検出可能と
なる。 Next, a method for detecting separation using the micro switch SW2 will be described. Registration roller pair 3, 3'
By knowing the paper conveyance speed and the paper conveyance distance between the registration roller pair 3, 3' and the micro switch SW2, the time required for the paper to reach the micro switch SW2 after the registration roller pair 3, 3' is driven can be determined. . Therefore, the registration roller pair 3,
By operating a timer when 3' is driven and determining whether or not the microswitch SW2 is turned on during a certain period of time, it is possible to detect separation or poor separation.
上記マイクロスイツチSW２の取付け位置を第
２図に示す。これは、まず分離装置６よりも排紙
側であること。次に、破線の１７で示したような
最悪の分離状態でも、マイクロスイツチSW２を
動作させる位置であること。以上２点を満たし、
可能な範囲で最も分離装置６の近くに、紙の搬送
を阻害しないようにアクチユエータのみが紙に接
触するように取付ける。 The mounting position of the micro switch SW2 is shown in Fig. 2. First of all, this must be on the paper discharge side rather than the separation device 6. Next, it must be in a position that allows microswitch SW2 to operate even in the worst case of separation as shown by the broken line 17. Satisfies the above two points,
The actuator is installed as close as possible to the separation device 6 so that only the actuator comes into contact with the paper so as not to impede the conveyance of the paper.
次に前記レジストローラ対３，３′の駆動時に
動作するタイマーの設定時間としては、まず、レ
ジストローラ対３，３′の駆動後、最悪分離状態
でマイクロスイツチSW２がオンする時間よりも
長くする。かつ複写可能な最小送り方向長さの紙
が分離不良時においても感光体ドラムに付着した
ままクリーニング装置内に巻込まれず一部終端が
残存する如く動作する時間に設定する。つまり、
タイマー動作が完了し、感光体ドラム４の回転を
停止（機器の動作停止）させた時に複写可能な全
てのサイズの紙の一部終端はクリーニング装置外
に露出しているようにする。 Next, the setting time of the timer that operates when the registration roller pair 3, 3' is driven is set to be longer than the time that the micro switch SW2 is turned on in the worst-case separated state after the registration roller pair 3, 3' is driven. . In addition, the operation time is set such that even when paper having the minimum length in the feeding direction that can be copied is defective in separation, the paper remains attached to the photoreceptor drum and is not wound up in the cleaning device, with a portion of the end remaining. In other words,
When the timer operation is completed and the rotation of the photosensitive drum 4 is stopped (the operation of the device is stopped), a part of the end of paper of all sizes that can be copied is exposed outside the cleaning device.
このようにタイマーを設定することにより、お
のずと紙分離検出手段の配設位置は、前記タイマ
ーがレジストローラ対３，３′の駆動後、最悪分
離状態で紙分離検出手段が動作する時間よりも長
く、かつ最小送り方向の長さの紙が分離不良時に
おいても感光体ドラムに付着したままクリーニン
グ装置内に巻込まれず一部終端が残存するように
動作する如く設定された時間よりも短い時間で動
作するように紙搬送装置に配置し、分離不良を前
記タイマーで検出するようにしている。 By setting the timer in this way, the position of the paper separation detection means is automatically set for a longer time than the time during which the paper separation detection means operates in the worst separation state after the registration roller pair 3, 3' is driven. , and operates in a shorter time than the set time so that even if the paper with the minimum length in the feeding direction fails to separate, it will not be caught in the cleaning device while attached to the photoreceptor drum and some of the ends will remain. The timer is arranged in the paper conveying device so that separation failure is detected by the timer.
次に、紙詰りの検知について第３図のフローチ
ヤートと共に詳述する。まず、ステツプ９でレジ
ストローラ対３，３′を駆動すると同時にタイマ
ーをスタートさせる。そしてタイマー動作中に、
紙の先端がマイクロスイツチSW２をオンさせる
まではステツプ10、11の動作判定を行ない続け
る。正常時にはタイマー動作中に感光体ドラム４
から分離された紙によつてマイクロスイツチSW
２がオンする（ステツプ11）。よつてステツプ12
に進み、紙が感光体ドラム４から分離されたと判
断し、ステツプ13の複写動作を継続して行なう。
しかし分離不良時は紙がマイクロスイツチSW２
の所を通らないため、ステツプ10、11の判定を繰
り返した後、タイマー動作が完了してしまい、ス
テツプ14に進み分離不良と判断し、ステツプ15で
コピー動作を停止させ、ステツプ16で異常発生を
表示させる。 Next, paper jam detection will be described in detail with reference to the flowchart of FIG. First, in step 9, the registration roller pair 3, 3' is driven and at the same time a timer is started. And while the timer is running,
The operation judgments in steps 10 and 11 are continued until the leading edge of the paper turns on the micro switch SW2. During normal operation, the photoconductor drum 4 is activated while the timer is operating.
Micro switch SW by paper separated from
2 turns on (step 11). Step 12
Then, it is determined that the paper has been separated from the photosensitive drum 4, and the copying operation of step 13 is continued.
However, if there is a separation failure, the paper is exposed to the micro switch SW2.
After repeating the judgments in steps 10 and 11, the timer operation completes, and the process proceeds to step 14, where it is determined that there is a separation failure, the copy operation is stopped in step 15, and an error occurs in step 16. Display.
なお上記実施例においては、分離検出用にマイ
クロスイツチを用いたが、リードスイツチを用い
てもよく、要は紙の重力によつて検知レバーを動
作させ、この検知レバーによつて動作するスイツ
チであれば、いかなる構造のものでも使用可能で
ある。 In the above embodiment, a micro switch was used for separation detection, but a reed switch may also be used.In short, the detection lever is operated by the gravity of the paper, and the switch is operated by this detection lever. Any structure can be used if there is one.
以上詳述した如く本発明によれば、機構的な紙
分離検知手段とタイマーとを組み合せることによ
り、紙分離不良を確実に検知することができ、か
つ紙詰り時においても（分離不良時）紙の一部終
端が露出しているため除去処置が容易となる。ま
た、トナー紙粉等に左右されずに確実に動作でき
る。さらには検出手段が簡単になり、コストの低
減が図れると云つた効果も奏する。 As described in detail above, according to the present invention, by combining a mechanical paper separation detection means and a timer, it is possible to reliably detect paper separation failure, and even in the event of a paper jam (at the time of separation failure). A portion of the end of the paper is exposed, making removal easier. In addition, it can operate reliably without being affected by toner paper dust or the like. Furthermore, the detection means can be simplified and costs can be reduced.
第１図および第２図は本発明の一実施例を説明
するための複写機の要部機能図、第３図は同本発
明の実施例における紙分離および分離不良の検出
動作を説明するためのフローチヤートである。
１……給紙ローラ、２……カセツト、３，３′
……レジストローラ対、４……感光体ドラム、５
……転写装置、６……分離装置、７……紙搬送装
置、８……定着装置。
1 and 2 are functional diagrams of main parts of a copying machine for explaining an embodiment of the present invention, and FIG. 3 is a diagram for explaining paper separation and detection of separation failure in an embodiment of the present invention. This is a flowchart. 1...Paper feed roller, 2...Cassette, 3, 3'
... Registration roller pair, 4 ... Photoreceptor drum, 5
...Transfer device, 6...Separation device, 7...Paper conveyance device, 8...Fixing device.
Claims (1)
で進行する間に作動するように配置し、前記感光
体ドラムからの分離を前記転写紙の自重により検
出する紙分離検出手段と、レジストローラ対の駆
動後カウントを開始するタイマーを有し、前記タ
イマーは、前記転写紙が最悪分離状態で前記感光
体ドラムから分離する時間よりも長く、かつ最小
送り方向長さの前記転写紙が分離不良時において
も前記感光体ドラムに付着したままクリーニング
装置内に前記転写紙の全部が巻き込まれず、一部
終端が残存する時間よりも短い時間に設定され、
タイマー動作中に前記紙分離検出手段が作動した
場合に紙分離が正常に行われたものとして機器の
動作を継続し、タイマー動作完了まで前記紙分離
検出手段が作動しない場合、前記クリーニング装
置内に前記転写紙の全部が巻き込まれず、少なく
とも一部終端が残存した状態で機器の動作を停止
するように構成したことを特徴とする紙分離検知
装置。1 A paper separation detection means arranged to operate while the transfer paper is separated from the photoreceptor drum and progresses to the fixing step, and detects separation from the photoreceptor drum by the weight of the transfer paper; and a pair of registration rollers. The timer includes a timer that starts counting after driving, and the timer is set to be longer than the time required for the transfer paper to separate from the photoreceptor drum in the worst-case separation state, and when the transfer paper having a minimum length in the feeding direction is defective in separation. The transfer paper is also set to a shorter time than the time during which a portion of the transfer paper remains attached to the photoreceptor drum without being rolled up in its entirety within the cleaning device;
If the paper separation detection means is activated during the timer operation, it is assumed that paper separation has been performed normally and the device continues to operate, and if the paper separation detection means does not operate until the timer operation is completed, a A paper separation detection device characterized in that the device is configured to stop operating in a state in which not all of the transfer paper is rolled up but at least a portion of the trailing edge remains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57024714A JPS58142360A (en) | 1982-02-17 | 1982-02-17 | Paper jam detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57024714A JPS58142360A (en) | 1982-02-17 | 1982-02-17 | Paper jam detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58142360A JPS58142360A (en) | 1983-08-24 |
| JPH0377513B2 true JPH0377513B2 (en) | 1991-12-10 |
Family
ID=12145831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57024714A Granted JPS58142360A (en) | 1982-02-17 | 1982-02-17 | Paper jam detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58142360A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60181759A (en) * | 1984-02-29 | 1985-09-17 | Fujitsu Ltd | Recording apparatus |
| JP2611199B2 (en) * | 1986-05-23 | 1997-05-21 | 日立工機株式会社 | Cut paper laser beam printer |
| JP2640689B2 (en) * | 1989-06-05 | 1997-08-13 | 富士通株式会社 | Image forming device |
| JP2649127B2 (en) * | 1992-08-28 | 1997-09-03 | 三田工業株式会社 | Paper supply device for image forming apparatus |
| JP4553807B2 (en) * | 2005-07-12 | 2010-09-29 | シャープ株式会社 | Image forming apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5622539U (en) * | 1979-07-27 | 1981-02-28 | ||
| JPS5654454A (en) * | 1979-10-09 | 1981-05-14 | Canon Inc | Transfer type copying machine |
-
1982
- 1982-02-17 JP JP57024714A patent/JPS58142360A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58142360A (en) | 1983-08-24 |
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