JPH0326637A - Paper detecting device for discharge paper stacker of large quantity - Google Patents
Paper detecting device for discharge paper stacker of large quantityInfo
- Publication number
- JPH0326637A JPH0326637A JP1161142A JP16114289A JPH0326637A JP H0326637 A JPH0326637 A JP H0326637A JP 1161142 A JP1161142 A JP 1161142A JP 16114289 A JP16114289 A JP 16114289A JP H0326637 A JPH0326637 A JP H0326637A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- tray
- light emitting
- light
- emitting element
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 41
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000032258 transport Effects 0.000 claims 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 15
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Controlling Sheets Or Webs (AREA)
Abstract
Description
【発明の詳細な説明】
覆果Ｌ鹿社匙九匙
本発明は，レーザプリンタや複写機等の画像形成装置な
どから排出されてくる大量の用紙を順次スタックする大
量排紙スタッカにおいて，用紙を検出する用紙検出装置
に関する．
炎来立五豊
第５図は，従来の大量排紙スタッカを示す。このスタッ
カは、搬入ユニット１とフィードユニット２とトレイユ
ニット３の三つのユニットで構威されている．
搬入ユニット１は，用紙サイズに応じて開くゲート４と
駆動ローラ５とガイド板６とを有し，画像形成装置から
排出されてくる用紙７をフィードユニット２へと搬送す
る．
フィードユニット２は，軸８を中心に回動するクランク
アーム９，該クランクアーム９の遊端に軸支されたフィ
ードローラ１０．軸８を中心に回転する駆動プーり１１
，該駆動プーり１１を介してフィードローラ１０を回転
させるフィードモータ１２，フィードローラ１０を用紙
７に圧接させるスプリング１３、フィードローラ１０を
用紙７の積載面から退避させる電磁石１４とを有する．
そして，搬入ユニット１で搬入された用紙７を、その先
端がトレイユニット３のフレーム１５の一部である用紙
ストツパ１６に衝突するまでフイードローラ１０により
搬送する．
トレイユニット３は，フレーム１５に装着された一対の
昇降ワイヤ１７・１８間にベーパトレイｌ９を水平に架
設しており，これら昇降ワイヤ１７・１８を昇降モータ
２０によって同時に駆動することによりペーパトレイ１
９を昇降する．トレイユニット３全体は、レール２１に
沿ってハウジング２２外へ引き出すことができるように
なっている．
上記フィードユニット２には、さらにペーパトレイ１９
上に用紙７が無いことを検出する残紙検出機構２３と，
ペーパトレイ１９上の用紙７の積載高さを検出する積載
高さ検出機構２４の二つに用紙検出機構が装着されてい
る．
残紙検出機構２３は、軸２５を中心に回動する検知レバ
ー２６と、フオトセンサ２７と、検知レバー２６を退避
させる電磁石２８とを有する．第６図に示すように，ペ
ーパトレイ１９上に用紙７が有るときは，検知レバー２
６の下端が用紙７によってベーパトレイ１９の凹部１９
ａ上へ持ち上げられるため、検知レバー２６がフォトセ
ンサ２７から外れて該フォトセンサ２７がオンになる．
ベーパトレイ１９上の用紙７が無くなると、検知レバー
２６の下端が凹部１９ａに落ち込むため、検知レバー２
６がフォトセンサ２７の光を遮断して該フォトセンサ２
７がオフになる。[Detailed Description of the Invention] The present invention is a method for stacking paper in a large quantity discharge stacker that sequentially stacks a large quantity of paper discharged from an image forming device such as a laser printer or a copying machine. This paper relates to a paper detection device. Figure 5 shows a conventional large-volume stacker. This stacker consists of three units: a carry-in unit 1, a feed unit 2, and a tray unit 3. The carry-in unit 1 has a gate 4 that opens depending on the paper size, a drive roller 5, and a guide plate 6, and conveys the paper 7 discharged from the image forming apparatus to the feed unit 2. The feed unit 2 includes a crank arm 9 that rotates around a shaft 8, and a feed roller 10 that is pivotally supported at the free end of the crank arm 9. Drive pulley 11 rotating around shaft 8
, a feed motor 12 that rotates the feed roller 10 via the drive pulley 11, a spring 13 that presses the feed roller 10 against the sheet 7, and an electromagnet 14 that retracts the feed roller 10 from the sheet 7 loading surface.
Then, the paper 7 carried in by the carrying unit 1 is conveyed by the feed roller 10 until its leading edge collides with a paper stopper 16 that is a part of the frame 15 of the tray unit 3. The tray unit 3 has a vapor tray 19 installed horizontally between a pair of lifting wires 17 and 18 attached to a frame 15, and the paper tray 1 is moved by driving these lifting wires 17 and 18 simultaneously by an lifting motor 20.
Go up and down 9. The entire tray unit 3 can be pulled out of the housing 22 along a rail 21. The feed unit 2 further includes a paper tray 19.
a remaining paper detection mechanism 23 that detects that there is no paper 7 on top;
Paper detection mechanisms are attached to two of the stacking height detection mechanisms 24 that detect the stacking height of the paper 7 on the paper tray 19. The remaining paper detection mechanism 23 includes a detection lever 26 that rotates around a shaft 25, a photo sensor 27, and an electromagnet 28 that retracts the detection lever 26. As shown in FIG. 6, when there is paper 7 on the paper tray 19, the detection lever 2
The lower end of the paper 7 is connected to the recess 19 of the vapor tray 19.
Since the detection lever 26 is removed from the photosensor 27, the photosensor 27 is turned on.
When the paper 7 on the vapor tray 19 runs out, the lower end of the detection lever 26 falls into the recess 19a, so the detection lever 2
6 blocks the light of the photosensor 27 and the photosensor 2
7 is turned off.
積載高さ検出機構２４は，前記クランクアーム９の上端
部９ａによって光を遮断されるフォトセンサ２９を有す
る．ペーバトレイ１９上に積載される用紙枚数が多くな
ると，フィードローラ１０が持ち上げられてクランクア
ーム９が第８図実線で示すように矢印八方向に回動され
るため、該クランクアーム９の上端部９ａがフォトセン
サ２９の光を遮断して該フォトセンサ２９がオフになる
．そしてペーパトレイｌ９が下降される．これに伴いク
ランクアーム９が第８図鎖線で示すように八方向とは逆
方向に回動してフォトセンサ２９から外れ，該フォトセ
ンサ２９がオンになると、ぺ一バトレイ１９の下降は停
止する。The loading height detection mechanism 24 includes a photosensor 29 whose light is blocked by the upper end 9a of the crank arm 9. When the number of sheets stacked on the paver tray 19 increases, the feed roller 10 is lifted and the crank arm 9 is rotated in the eight directions of arrows as shown by the solid line in FIG. blocks the light from the photosensor 29, turning the photosensor 29 off. Then, the paper tray l9 is lowered. Along with this, the crank arm 9 rotates in the opposite direction to the eight directions as shown by the chain line in FIG. .
が解決しようとする課題
ところが、この種の大量排紙スタッカは，ペーバトレイ
１９が着脱可能であり，またトレイユニット３全体も上
記のように引き出し可能であるため、ペーパトレイ１９
のセット位置のバラツキが多く、その凹部１９ａが検知
レバー２６に対してズレることか多い．そのため、第７
図に示すように検知レバー２６の下端がペーパトレイ１
９の凹部１９ａから外れ、用紙がペーバトレイ１９上か
ら無くなっていても、従来の残紙検出機構２３では誤っ
て残紙有りを検出してしまう問題があった．また，従来
の積載高さ検出機構２９では，フィードローラ１０が用
紙の積載面に衝突して第９図に示すように振動するため
，クランクアーム９が繰り返し揺動して積載高さを誤検
出し、用紙のジャムを引き起こす問題があった．
本発明は、従来のような残紙有無の誤検出及び積載高さ
の誤検出をいずれも解消することを目的とする．
課題を解 するための手
本発明は，ペーバトレイ上の残紙の有無を検出するため
，ペーパトレイより上方の所定位置に発光素子を配置す
る一方、これと対向する下方の所定位置には残紙検出用
受光素子を配置し、またぺ一パトレイに、前記発光素子
からの光を前記残紙検出用受光素子へと透過させる透孔
を設ける．また、積載高さを検出するため，前記発光素
子は前記ペーパトレイの上方所定高さに焦点を有するも
のとし、また受光光軸が発光素子の発光光軸とその焦点
で所定の角度で交わる積載高さ検出用受光素子を備える
．
生一一歴
ペーパトレイ上に用紙が無い状態では、発光素子からの
光がペーバトレイの透光を透過して残紙検出用受光素子
１二入光するが，ペーパトレイ上に用紙が有ると発光素
子からの光は該用紙によってによって遮断され残紙検出
用受光素子へ入光しなレ１．
用紙が発光素子の焦点の高さまでペーバトレイ上に積載
されると，積載高さ検出用受光素子へ入光する反射光量
が多くなるため、該受光素子の出力は高くなるが，用紙
の積載面の高さが発光素子の焦点の高さより低くなると
、積載高さ検出用受光素子へ入光する反射光量が少なく
なるため，該受光素子の出力は低下する．
実施例
次に，本発明の実施例を図面に従い詳述する．第４図は
、本発明による用紙検出装置を備える大量排紙スタッカ
の内部機構図である．この大量排紙スタッカは、搬入ユ
ニット３０とフイードユニット３１とトレイユニット３
２の三つのユニット，及び本発明による用紙検出装Ｉ！
３３とで構成されている．
搬入ユニット３０は，用紙サイズに応じて開くゲート３
４と駆動ローラ３５とガイド板３６とを有し、画像形或
装置から排出されてくる用紙をフィードユニット３１へ
と搬送する．
フィードユニット３１は、軸３７を中心に回動するクラ
ンクアーム３８、該クランクアーム３８の遊端に軸支さ
れたフィードローラ３９、これと同軸の従動プーり４０
，軸３７を中心に回転する駆動プーり４１、これらプー
り４０・４１間に掛け渡された丸ベルト４２、駆動プー
り４１と一体回転する駆動ギア４３、該駆動ギア４３と
噛み合うモータギア４４，フィードモータ４５，フィー
ドローラ３９を用紙に圧接させるスプリング４６、フィ
ードローラ３９を用紙の積載面から退避させる電磁石４
７とを有する．そして、搬入ユニット３０で搬入された
用紙を、その先端がトレイユニット３２のフレーム４８
の一部である用紙ストツパ４９に衝突するまでフィード
ローラ３９により搬送する．
トレイユニット３２は、一対の昇降ワイヤ５０・５１を
それぞれフレーム４８の両側に装着された上下のプーリ
５２・５３間に掛け渡し、これら昇降ワイヤ５０・５１
間にベーパトレイ５４を水平に架設しており、これら昇
降ワイヤ５０・５１を昇降モータ５５によって同時に駆
動することによりベーバトレイ５４を昇降する．トレイ
ユニット３２全体は，レール５６に沿ってハウジング５
７外へ引き出すことができるようになっている．第１図
に，用紙検出装１ｉ３３を具体的に示す．カバー５８内
に配置されたプリント基板５９に，発光素子６０と積載
高さ検出用受光素子６１と制御用ＩＣ６２・６３が取り
付けられ，また前記フレーム４８の底部上には、発光素
子６０の発光光軸６４上において残紙検出用受光素子６
５が取り付けされている。However, in this type of large-volume stacker, the paper tray 19 is removable and the entire tray unit 3 can be pulled out as described above.
There are many variations in the set position of the recess 19a, and the recess 19a is often misaligned with the detection lever 26. Therefore, the seventh
As shown in the figure, the lower end of the detection lever 26 is connected to the paper tray 1.
Even if the paper has come off the recess 19a of the paver tray 19 and is no longer on the paver tray 19, the conventional remaining paper detection mechanism 23 has the problem of incorrectly detecting the presence of remaining paper. In addition, in the conventional stacking height detection mechanism 29, the feed roller 10 collides with the paper stacking surface and vibrates as shown in FIG. However, there was a problem that caused paper jams. The present invention aims to eliminate both the conventional erroneous detection of the presence or absence of remaining paper and the erroneous detection of the stacking height. A method for solving the problem In the present invention, in order to detect the presence or absence of remaining paper on the paver tray, a light emitting element is arranged at a predetermined position above the paper tray, while a remaining paper detection element is arranged at a predetermined position below the paper tray opposite to the light emitting element. A through hole is provided in the paper tray to transmit light from the light emitting element to the light receiving element for remaining paper detection. Further, in order to detect the stacking height, the light emitting element has a focal point at a predetermined height above the paper tray, and the loading height is such that the light receiving optical axis intersects the light emitting optical axis of the light emitting element at a predetermined angle at the focal point. Equipped with a light-receiving element for detection. When there is no paper on the paper tray, the light from the light emitting element passes through the transparent light of the paver tray and enters the light receiving element 12 for detecting remaining paper, but when there is paper on the paper tray, the light from the light emitting element passes through the transparent light of the paver tray and enters the light receiving element 12. The light is blocked by the paper and does not enter the light receiving element for detecting remaining paper.1. When paper is stacked on the paver tray to the height of the focal point of the light emitting element, the amount of reflected light that enters the photodetector for stacking height detection increases, so the output of the photodetector increases; When the height is lower than the height of the focal point of the light emitting element, the amount of reflected light that enters the light receiving element for detecting the loading height decreases, so the output of the light receiving element decreases. Embodiment Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is an internal mechanism diagram of a large-volume paper stacker equipped with a paper detection device according to the present invention. This large-volume stacker includes a carry-in unit 30, a feed unit 31, and a tray unit 3.
2 and the paper detection device I! according to the present invention.
It consists of 33. The carry-in unit 30 has a gate 3 that opens depending on the paper size.
4, a drive roller 35, and a guide plate 36, and conveys the paper discharged from the image forming device to the feed unit 31. The feed unit 31 includes a crank arm 38 rotating around a shaft 37, a feed roller 39 pivotally supported at the free end of the crank arm 38, and a driven pulley 40 coaxial with the feed roller 39.
, a drive pulley 41 that rotates around a shaft 37, a round belt 42 stretched between these pulleys 40 and 41, a drive gear 43 that rotates integrally with the drive pulley 41, a motor gear 44 that meshes with the drive gear 43, A feed motor 45, a spring 46 that presses the feed roller 39 against the paper, and an electromagnet 4 that retracts the feed roller 39 from the paper stacking surface.
7. Then, the paper carried in by the carry-in unit 30 is placed so that its leading edge is connected to the frame 4 of the tray unit 32.
The paper is conveyed by the feed roller 39 until it collides with the paper stopper 49, which is a part of the paper. The tray unit 32 has a pair of lifting wires 50 and 51 stretched between upper and lower pulleys 52 and 53 mounted on both sides of the frame 48, respectively.
A vapor tray 54 is installed horizontally between them, and the vapor tray 54 is raised and lowered by simultaneously driving these lifting wires 50 and 51 by a lifting motor 55. The entire tray unit 32 is attached to the housing 5 along the rails 56.
7 It is now possible to pull it out. Figure 1 specifically shows the paper detection device 1i33. A light emitting element 60, a light receiving element 61 for detecting loading height, and control ICs 62 and 63 are attached to a printed circuit board 59 disposed inside the cover 58, and on the bottom of the frame 48, light emitted from the light emitting element 60 is mounted. A light receiving element 6 for detecting remaining paper is mounted on the shaft 64.
5 is installed.
発光素子６０の光はレンズ６６を介して投光され、その
焦点６７はペーパトレイ５４の上方所定位置にある．ベ
ーパトレイ５４には、発光素子６０からの光を残紙検出
用受光素子６５へと透過させるに充分な大きさの透孔６
８が設けられている．発光素子６０からの光は、ベーパ
トレイ５４上に用紙が無いときは、透孔６８を透過して
残紙検出用受光素子６５へ入光するが、ペーパトレイ５
４上に用紙があると該用紙によって遮断される．このこ
とによって、ペーバトレイ５４上の残紙の有無を検出で
きる．この場合、発光素子６０の光は，ぺ−パトレイ５
４の上方所定位置で焦点６７を結んで拡大してから残紙
検出用受光素子６５へ入光するため、該残紙検出用受光
素子６５の位置が多少ズレても充分に検出できる．
積載高さ検出用受光素子６１は、その受光光軸６９が発
光素子６０の発光光軸６４と所定の角度ｅをなして焦点
６７で交わる向きになっており、第２図に示すようにペ
ーパトレイ５４上に積載された用紙７０の積載゛上面７
１を反射した反射光をレンズ７２を介して入光する．そ
の入射光量は、積載上面７１の高さが焦点６７の高さと
一致したとき最大となる．従って，このとき積載高さ検
出用受光素子６１の出力は第３図に示すように最大ｖ６
になり，この状態から用紙７０の積載枚数が増加すると
出力は減少し，最大となる位置が同図において実線波形
Ａから破線波形Ｂ八と推移する．いま，積載枚数がΔＹ
増加して受光素子６１の出力がＶ．からｖ１へ減少した
とすると，受光素子６１の出力がＶ．に再び一致するま
で、ベーパトレイ５４を下降させると（ΔＹ分だけ），
積載上面７１の高さは焦点６７の高さと再び一致する．
見豊立豊果
以上説明したように、本発明によれば、ペーパトレイ上
に用紙が無いとき、発光素子からの光をペーバトレイに
設けられた透孔を通じ残紙検出用受光素子に入光させる
ことによって、残紙無しを検出するため，ペーバトレイ
またはトレイユニットのセット位置のパラツキによって
残紙の有無を誤検出するようなことはなく、バラツキが
あっても的確に検出できる．
また、請求項２に記載の発明によれば、フイードローラ
の振動による積載高さの誤検出を解消できる．The light from the light emitting element 60 is projected through a lens 66, and its focal point 67 is at a predetermined position above the paper tray 54. The vapor tray 54 has a through hole 6 large enough to transmit the light from the light emitting element 60 to the light receiving element 65 for detecting remaining paper.
8 are provided. When there is no paper on the vapor tray 54, the light from the light emitting element 60 passes through the through hole 68 and enters the light receiving element 65 for detecting remaining paper.
4. If there is paper above it, it will be blocked by the paper. With this, it is possible to detect whether there is any remaining paper on the paver tray 54. In this case, the light from the light emitting element 60 is emitted from the paper tray 5.
Since the focal point 67 is focused at a predetermined position above the paper 4, the light is magnified and then enters the light receiving element 65 for detecting remaining paper, so even if the position of the light receiving element 65 for detecting remaining paper is slightly shifted, it can be sufficiently detected. The light receiving element 61 for detecting the loading height is oriented so that its light receiving optical axis 69 forms a predetermined angle e with the light emitting optical axis 64 of the light emitting element 60 and intersects at a focal point 67, as shown in FIG. Loading of paper 70 stacked on 54 ゛Top surface 7
The reflected light from the lens 1 enters through the lens 72. The amount of incident light becomes maximum when the height of the loading top surface 71 matches the height of the focal point 67. Therefore, at this time, the output of the light receiving element 61 for detecting the loading height is at a maximum of v6 as shown in FIG.
As the number of loaded sheets of paper 70 increases from this state, the output decreases, and the position of the maximum changes from the solid line waveform A to the broken line waveform B8 in the figure. Now, the number of sheets loaded is ΔY
The output of the light receiving element 61 increases to V. Suppose that the output of the light receiving element 61 decreases from V. to v1. When the vapor tray 54 is lowered until it matches again (by ΔY),
The height of the loading top surface 71 again matches the height of the focal point 67.
As explained above, according to the present invention, when there is no paper on the paper tray, light from the light emitting element is made to enter the light receiving element for detecting remaining paper through the through hole provided in the paver tray. Since the system detects when there is no remaining paper, there is no possibility of incorrectly detecting the presence or absence of remaining paper due to variations in the set position of the paver tray or tray unit, and accurate detection is possible even if there are variations. Furthermore, according to the second aspect of the invention, it is possible to eliminate erroneous detection of the loading height due to vibration of the feed roller.
第１ｙＡは本発明による用紙検出装置の側面図、第２図
はそれにおける積載高さ検出状態の側面図、第３図は該
検出状態での積載高さ検出用受光素子の出力と用紙の積
載上面の高さとの関係を示す゛説明図，第４図はこの用
紙検出装置を備える大量排紙スタッカの内部機構の側面
図である．第５図は従来の大量排紙スタッカの内部機構
の側面図、第６図はそれにおける残紙検出機構及び積載
高さ検出機構の正面図、第７図は該残紙検出機構の誤検
出状態の正面図，第８図は積載高さ検出機構の側面図，
第９図は該積載高さ検出機構の誤検出を招くフィードロ
ーラの振動を説明する説明図である．1yA is a side view of the paper detection device according to the present invention, FIG. 2 is a side view of the stack height detection state thereof, and FIG. 3 is the output of the light receiving element for stack height detection and paper stacking in the detection state. Fig. 4 is a side view of the internal mechanism of a large-volume paper stacker equipped with this paper detection device. Fig. 5 is a side view of the internal mechanism of a conventional large-volume stacker, Fig. 6 is a front view of the remaining paper detection mechanism and stacking height detection mechanism thereof, and Fig. 7 is an erroneous detection state of the remaining paper detection mechanism. Figure 8 is a side view of the loading height detection mechanism.
FIG. 9 is an explanatory diagram illustrating the vibration of the feed roller that causes erroneous detection by the loading height detection mechanism.
Claims (1)
ペーパトレイ上に積載し、その積載高さを検出してその
高さに従いペーパトレイを下降させる大量排紙スタッカ
において、前記ペーパトレイより上方の所定位置に発光
素子を配置する一方、これと対向する下方の所定位置に
は残紙検出用受光素子を配置し、またペーパトレイに、
前記発光素子からの光を前記残紙検出用受光素子へと透
過させる透孔を設けたことを特徴とする、大量排紙スタ
ッカの用紙検出装置。 ２、前記発光素子は前記ペーパトレイの上方所定高さに
焦点を有し、また受光光軸が発光素子の発光光軸とその
焦点で所定の角度で交わる積載高さ検出用受光素子を備
えたことを特徴とする、請求項１記載の大量排紙スタッ
カの用紙検出装置。[Scope of Claims] 1. A large-volume paper stacker that transports sheets of paper until their leading edges collide with a paper stopper and stacks them on a paper tray, detects the stacking height, and lowers the paper tray according to the detected height. A light emitting element is disposed at a predetermined position above the paper tray, and a light receiving element for detecting remaining paper is disposed at a predetermined position below the paper tray.
A sheet detection device for a large-volume sheet discharge stacker, characterized in that a through hole is provided for transmitting light from the light emitting element to the light receiving element for detecting remaining sheets. 2. The light emitting element has a focal point at a predetermined height above the paper tray, and is equipped with a light receiving element for detecting loading height, the light receiving optical axis of which intersects the light emitting optical axis of the light emitting element at a predetermined angle at the focal point. A paper detection device for a large quantity discharge stacker according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161142A JPH0326637A (en) | 1989-06-23 | 1989-06-23 | Paper detecting device for discharge paper stacker of large quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161142A JPH0326637A (en) | 1989-06-23 | 1989-06-23 | Paper detecting device for discharge paper stacker of large quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0326637A true JPH0326637A (en) | 1991-02-05 |
Family
ID=15729393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1161142A Pending JPH0326637A (en) | 1989-06-23 | 1989-06-23 | Paper detecting device for discharge paper stacker of large quantity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326637A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04345443A (en) * | 1991-05-23 | 1992-12-01 | Stahl Gmbh & Co Mas Fab | Device for detecting piled sheet |
| JPH08180U (en) * | 1995-06-27 | 1996-02-02 | シュタール・ゲーエムベーハー・ウント・コンパニー・マシーネンファブリーク | Loading sheet detection device |
| US20150284195A1 (en) * | 2014-04-04 | 2015-10-08 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| JP2016113271A (en) * | 2014-12-16 | 2016-06-23 | 株式会社リコー | Sheet-like medium loading apparatus, image formation apparatus, control method and program |
| US9387999B2 (en) * | 2013-12-04 | 2016-07-12 | Canon Kabushiki Kaisha | Sheet feeding device and image forming apparatus |
-
1989
- 1989-06-23 JP JP1161142A patent/JPH0326637A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04345443A (en) * | 1991-05-23 | 1992-12-01 | Stahl Gmbh & Co Mas Fab | Device for detecting piled sheet |
| JPH08180U (en) * | 1995-06-27 | 1996-02-02 | シュタール・ゲーエムベーハー・ウント・コンパニー・マシーネンファブリーク | Loading sheet detection device |
| US9387999B2 (en) * | 2013-12-04 | 2016-07-12 | Canon Kabushiki Kaisha | Sheet feeding device and image forming apparatus |
| US20150284195A1 (en) * | 2014-04-04 | 2015-10-08 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| US9592973B2 (en) * | 2014-04-04 | 2017-03-14 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| JP2016113271A (en) * | 2014-12-16 | 2016-06-23 | 株式会社リコー | Sheet-like medium loading apparatus, image formation apparatus, control method and program |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7591459B2 (en) | Sheet feeding apparatus and image forming apparatus | |
| US7467789B2 (en) | Sheet handling apparatus and image forming apparatus | |
| US20090057986A1 (en) | Sheet feeding apparatus and image forming apparatus | |
| US20070194521A1 (en) | Sheet processing apparatus and sheet processing method | |
| US8579285B2 (en) | Document conveying device and image forming apparatus with first and second document detectors and pulse count detector | |
| EP0378177A2 (en) | Image forming apparatus | |
| JPH0326637A (en) | Paper detecting device for discharge paper stacker of large quantity | |
| US11039027B2 (en) | Image reading apparatus which detects a staple attached to a document and method of controlling the image reading apparatus | |
| JPH04156567A (en) | Image forming device | |
| US8576463B2 (en) | Automatic document feeder and image forming apparatus | |
| JP2008068937A (en) | Sheet feeder and image forming system | |
| US5010364A (en) | Copier with automatic document feed having jam prevention function | |
| JP3933810B2 (en) | Image reading apparatus and control method thereof | |
| JP2005045445A (en) | Automatic document feeder | |
| US11597616B2 (en) | Feeding device and image forming apparatus | |
| JP3930292B2 (en) | Paper feeding device, image reading device | |
| JPH10203685A (en) | Stacker | |
| JP2022173648A (en) | Paper feed device | |
| JPH06100222A (en) | Image forming device | |
| JPH0662178A (en) | Image reader | |
| JPH10139200A (en) | Document feeder and image processor | |
| JPH06103407B2 (en) | Document feeder | |
| JPS597647A (en) | Automatic sheet feeding device | |
| JPS58145969A (en) | Copying device | |
| JP2008010916A (en) | Optical image reading, apparatus and image reading method using thes apparatus |