JPH03293253A - Paper suction type conveyor - Google Patents
Paper suction type conveyorInfo
- Publication number
- JPH03293253A JPH03293253A JP2095512A JP9551290A JPH03293253A JP H03293253 A JPH03293253 A JP H03293253A JP 2095512 A JP2095512 A JP 2095512A JP 9551290 A JP9551290 A JP 9551290A JP H03293253 A JPH03293253 A JP H03293253A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- suction
- conveyed
- suction hole
- suction holes
- 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 abstract description 4
- 108091008695 photoreceptors Proteins 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は複写機、プリンター ファクシミリなどの画像
形成装置において用いられる用紙搬送装置に関し、特に
用紙吸引式搬送装置において確実な用紙吸引力を発生で
きるようにしたものに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper conveyance device used in image forming apparatuses such as copying machines, printers, and facsimiles, and particularly to a paper suction type conveyance device that can generate reliable paper suction force. Concerning what was done.
従来の用紙吸引式搬送装置としては例えば第5図、第6
図に示すようなものがある。図中1は感光体、2は転写
・分離チャージャ、3は用紙、4は搬送装置で、搬送装
置4は搬送ベルト5と吸引タンク6とからなり、吸引タ
ンク6の上面に設けた複数の吸引孔7・・・は搬送路面
に開口している。感光体1において転写・分離チャージ
ャ2により画像の転写を受けた用紙3は、先端側から搬
送装置4上に送り出される。吸引タンク6内は図示せぬ
吸引装置により吸引されており、吸引孔7からは吸引タ
ンク6外の空気が吸い込まれている。Examples of conventional paper suction type conveyance devices include those shown in Figs. 5 and 6.
There is something like the one shown in the figure. In the figure, 1 is a photoreceptor, 2 is a transfer/separation charger, 3 is paper, and 4 is a transport device.The transport device 4 consists of a transport belt 5 and a suction tank 6. The holes 7 are open to the conveyance path surface. The paper 3, on which the image has been transferred by the transfer/separation charger 2 on the photoreceptor 1, is sent onto the conveyance device 4 from the leading end side. The inside of the suction tank 6 is suctioned by a suction device (not shown), and air outside the suction tank 6 is sucked through the suction hole 7 .
この吸引孔7上に用紙3が位置すると用紙3は上述の吸
気により搬送路面上に吸着され、搬送ベルト5により定
着ローラ8へと搬送される。When the paper 3 is positioned above the suction hole 7 , the paper 3 is attracted onto the conveyance path surface by the above-mentioned suction air, and is conveyed to the fixing roller 8 by the conveyance belt 5 .
上述した従来の用紙吸引式搬送装置では、吸引孔7はそ
の数、開口面積及び開口位置のすべてが固定されている
。このため小サイズの用紙を使用した場合や、用紙先端
部、後端部が通過する場合、用紙で覆われない吸引孔7
ができる。この用紙で覆われていない吸引孔7は当然外
部の空気を吸引することになり、そのなめ用紙に対する
吸引力が不足して用紙の不送り、用紙の上下動による画
像不良等を発生させてしまうことがある。In the conventional paper suction conveyance device described above, the number, opening area, and opening position of the suction holes 7 are all fixed. Therefore, when using small-sized paper or when the leading edge and trailing edge of the paper pass through, the suction hole 7 is not covered by the paper.
Can be done. The suction holes 7 that are not covered by the paper naturally suck in outside air, and the suction force against the slicked paper is insufficient, resulting in paper not being fed or image defects due to vertical movement of the paper. Sometimes.
そこで安定した吸引力を確保するため従来は極力吸引孔
を搬送装置の端部側に設けることなどで対応していたが
、十分な対応にはなっていなかった。In order to ensure a stable suction force, conventional measures have been taken such as providing suction holes as close to the end of the conveying device as possible, but this has not been a sufficient measure.
本発明は上記従来の問題点に鑑みてなしなもので、通過
する用紙サイズに応じて用紙で覆われる吸引孔の数や面
積を適正化し上記問題点を解決しようとするものである
。The present invention has been made in view of the above-mentioned conventional problems, and is an attempt to solve the above-mentioned problems by optimizing the number and area of suction holes covered by paper according to the size of the paper passing through.
本発明は上記目的を達成するために、複数の吸引孔を用
紙搬送路に臨ませたタンク内を吸引し、上記搬送路面上
に用紙を吸引して搬送する用紙吸引式搬送装置において
、搬送される用紙サイズの検知手段と、該検知手段の検
知内容に応じて上記吸引孔の開口状態を変化させる開閉
手段を備える構成としである。In order to achieve the above-mentioned object, the present invention provides a paper suction type conveyance device that suctions the inside of a tank having a plurality of suction holes facing the paper conveyance path, and conveys the paper by suctioning it onto the surface of the conveyance path. The apparatus is configured to include a paper size detecting means, and an opening/closing means for changing the opening state of the suction hole in accordance with the detection contents of the detecting means.
以下本発明の実施例を図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
なお、以下では従来と共通ずる部分には共通する符号を
付して重複する説明は省略する。In addition, in the following, the same reference numerals are given to parts that are common to those of the conventional art, and redundant explanations will be omitted.
第1図及び第2図は本発明の一実施例を示す図であり、
第1図は第5図相当の断面側面図、第2図は第1図の上
方向から見た用紙搬送路の平面図である。FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention,
FIG. 1 is a cross-sectional side view corresponding to FIG. 5, and FIG. 2 is a plan view of the paper conveyance path seen from above in FIG. 1.
図中10はセンサーで、搬送される用紙3のサイズ、具
体的には送り方向の長さを用紙3との接触時間により検
出している。また図中11は開閉機構で、センサー10
が検知した用紙3の送り方向長さに応じて吸引孔7の開
口数を切り替えるものである。In the figure, reference numeral 10 denotes a sensor that detects the size of the paper 3 to be transported, specifically the length in the feeding direction, based on the contact time with the paper 3. In addition, numeral 11 in the figure is an opening/closing mechanism, and sensor 10
The numerical aperture of the suction hole 7 is changed according to the detected length of the paper 3 in the feeding direction.
第2図に示すように本実施例は8個所の吸引孔7を感光
体1側の4個と定着ローラ8側の4個とに分割して制御
している。そして吸引孔7の開口状態切換用に一対のシ
ールド板12.13を吸引タンク6内に設け、各シール
ド板12.13を夫々ソレノイド14.15でスライド
させ、担当する吸引孔7を開閉できるようにしである。As shown in FIG. 2, in this embodiment, the eight suction holes 7 are divided and controlled into four on the photoreceptor 1 side and four on the fixing roller 8 side. A pair of shield plates 12.13 are provided in the suction tank 6 for switching the opening state of the suction holes 7, and each shield plate 12.13 is slid by a solenoid 14.15, so that the suction holes 7 in charge can be opened and closed. It's Nishide.
なお図中16.17は付勢用のスプリングである。Note that reference numerals 16 and 17 in the figure represent biasing springs.
次に本実施例の動作を第3図a、b、c、及び第4図を
参照して説明する。Next, the operation of this embodiment will be explained with reference to FIGS. 3a, 3b, and 4c, and FIG. 4.
初期状態においてはセンサー10、両ソレノイド12.
13ともOFFである。In the initial state, the sensor 10, both solenoids 12.
13 are all OFF.
ここでセンサー10が用紙3の搬送を検知してONする
と、これと共にソレノイド15がONとなる。ソレノイ
ド15がONとなることによってシールド板13はスプ
リング17の付勢力に抗して第2図中下方に引かれ、担
当する定着ローラ8側の4個の吸引孔7・・・を閉じる
。これによって感光体1側の4個の吸引孔7・・・のみ
が開き、吸引孔7からの吸引力を用紙3の先端側に集中
させ、用紙3の先端側を吸引して搬送ベルト5の搬送路
面に吸着させる。用紙3は搬送ベルト5の回転により先
端側から順次搬送路面に吸着され、搬送される(第3図
a)。Here, when the sensor 10 detects conveyance of the paper 3 and turns on, the solenoid 15 also turns on. When the solenoid 15 is turned on, the shield plate 13 is pulled downward in FIG. 2 against the biasing force of the spring 17, and closes the four suction holes 7 on the fixing roller 8 side. As a result, only the four suction holes 7 on the photoreceptor 1 side are opened, and the suction force from the suction holes 7 is concentrated on the leading edge side of the paper 3. Adsorb it to the transport road surface. As the conveyor belt 5 rotates, the sheets 3 are successively attracted to the conveyance path surface from the leading edge side and conveyed (FIG. 3a).
ソレノイド15は所定時間t2の経過後オフとなり、こ
れに伴ってシールド板13はスプリング17により第2
図の位置に戻され、吸引孔7はすべて開放される。時間
t2はセンサー10がONした後、用紙3の先端がタン
ク6の中央部を通過するまで(第3図a中に2点鎖線で
示す。)の概略時間に相当させて設定する。この時用紙
3は搬送路面全体において吸着される状態になる(第3
図b)。The solenoid 15 is turned off after a predetermined time t2, and accordingly, the shield plate 13 is turned off by the spring 17.
It is returned to the position shown in the figure, and all suction holes 7 are opened. The time t2 is set to approximately correspond to the time from when the sensor 10 is turned on until the leading edge of the paper 3 passes through the center of the tank 6 (indicated by a two-dot chain line in FIG. 3a). At this time, the paper 3 is attracted to the entire transport path surface (the third
Figure b).
用紙3の後端がセンサー10の位置を通過するとセンサ
ー10はOFFとなる。即ち時間t1は用紙3がセンサ
ー10を通過するのに要した時間であり、これを紙サイ
ズの代用特性として検知する。When the trailing edge of the paper 3 passes the position of the sensor 10, the sensor 10 is turned off. That is, the time t1 is the time required for the paper 3 to pass the sensor 10, and this is detected as a substitute characteristic of the paper size.
さらにセンサー10のOFF後、時間上3が経過すると
ソレノイド14がONとなる。そしてソレノイド14が
ONすると、シールド板12はスプリング16の付勢力
に抗して第2図中下方に引かれ、担当する感光体1側の
4個の吸引孔7・・・を閉じ、定着ローラ8側の4個の
吸引孔7・・のみを開く。これによって吸引孔7による
吸引力は定着ローラ8側に集中する状態になる。時間上
3はセンサー10がOFFとなった後、用紙3の後端が
タンク6の中央部に到達するまでの概略の時間であり、
この時用紙3は先端が既に定着ローラ8に差し掛かって
おり(第3図C)、用紙3は搬送ベル1〜5の回転によ
り後端側をしっかりと搬送路面に吸着され、搬送される
。Furthermore, after the sensor 10 is turned off, the solenoid 14 is turned on when three hours have elapsed. When the solenoid 14 is turned ON, the shield plate 12 is pulled downward in FIG. Open only the four suction holes 7 on the 8 side. As a result, the suction force from the suction hole 7 is concentrated on the fixing roller 8 side. Time 3 is the approximate time from when the sensor 10 is turned off until the trailing edge of the paper 3 reaches the center of the tank 6;
At this time, the leading edge of the paper 3 has already approached the fixing roller 8 (FIG. 3C), and the trailing end of the paper 3 is firmly attracted to the transport path surface by the rotation of the transport bells 1 to 5, and the paper 3 is transported.
ソレノイド14はONしてから時間t4の経過後にOF
Fとなる。この時間t4は用紙3の後端がタンク6の中
央を通過した後にタンク6を完全に通過するまでに要す
る時間である。これによって各部は初期状態に戻り、次
の用紙3の到来を待つ。The solenoid 14 turns OFF after time t4 has elapsed since it was turned ON.
It becomes F. This time t4 is the time required for the rear end of the paper 3 to completely pass through the tank 6 after passing through the center of the tank 6. As a result, each section returns to its initial state and waits for the arrival of the next sheet 3.
なお、本実施例のセンサー10に代えて、給紙カセット
サイズ表示機構からの信号に基づき開閉機構の動作を決
めるようにしてもよい。また本実施例では用紙の送り方
向での長さにより吸引孔の開閉状態を切換でいるが用紙
の幅方向の寸法検知により切換えるようにすることも可
能である。Note that instead of the sensor 10 of this embodiment, the operation of the opening/closing mechanism may be determined based on a signal from a paper feed cassette size display mechanism. Further, in this embodiment, the opening/closing state of the suction hole is switched depending on the length of the paper in the feeding direction, but it is also possible to switch the open/closed state by detecting the widthwise dimension of the paper.
本発明に係る用紙吸引式搬送装置は以上説明してきたよ
うに、搬送される用紙のサイズ検知内容に応じて吸引孔
の開口状態を変化させる開閉手段を備えるようにしたの
で、用紙に覆われていない吸引孔からの空気洩れを減少
させることができるようになり、安定した吸引力が確保
できるという効果があり、特に用紙の上側搬送システム
を採用している画像形成装置において大きな効果が得ら
れる。そして空気洩れの度合いが大きくなる用紙の先端
部や後端部での不送り、紙詰まり及び定着前の用紙の上
下動による画像の乱れが低減されるという効果がある。As described above, the paper suction type conveyance device according to the present invention is equipped with an opening/closing means that changes the opening state of the suction hole according to the detected size of the paper to be conveyed, so that it is not covered with paper. This has the effect of reducing air leakage from the suction holes, ensuring stable suction force, and is particularly effective in image forming apparatuses that employ an upper paper conveyance system. This has the effect of reducing image disturbances caused by non-feeding at the leading and trailing ends of the paper, where the degree of air leakage increases, paper jams, and vertical movement of the paper before fixing.
第1図ないし第4図は本発明の一実施例に係る用紙吸引
式搬送装置を示し、第1図は第5図相当の断面側面図、
第2図は第1図の上方向から見た用紙搬送路の平面図、
第3図a、b、cは、用紙の搬送状態と吸引孔の開閉状
態を示す断面側面図で、第3図aは用紙搬送の初期状態
を、第3図すは用紙搬送の中期状態を、第3図Cは用紙
搬送の終期状態を夫々示し、第4図は用紙検知と吸引孔
の開閉状態の関連を示すタイミングチャート、第5図は
従来の用紙吸引式搬送装置の断面側面図、そして第6図
は同斜視図である。
111.感光体 209.転写・分離チャージャ3
14.用紙 461.搬送装置51.6搬送ベル
ト 62.、吸引タンク761.吸引孔 8゜9.
定着ローラ10 、、、センサー 11 、、、開閉機
構12.13 、、、シールド板
14.15 、、、ソレノイド
16.17 、、、スプリング1 to 4 show a paper suction type conveyance device according to an embodiment of the present invention, and FIG. 1 is a cross-sectional side view corresponding to FIG.
Figure 2 is a plan view of the paper conveyance path seen from above in Figure 1;
Figures 3a, b, and c are cross-sectional side views showing the paper transport state and the opening/closing state of the suction holes. Figure 3a shows the initial state of paper transport, and Figure 3 shows the middle stage of paper transport. , FIG. 3C shows the final state of paper conveyance, FIG. 4 is a timing chart showing the relationship between paper detection and the opening/closing state of the suction hole, and FIG. 5 is a cross-sectional side view of a conventional paper suction type conveyance device. FIG. 6 is a perspective view of the same. 111. Photoreceptor 209. Transfer/separation charger 3
14. Paper 461. Conveying device 51.6 Conveying belt 62. , suction tank 761. Suction hole 8°9.
Fixing roller 10 , Sensor 11 , Opening/closing mechanism 12.13 , Shield plate 14.15 , Solenoid 16.17 , Spring
Claims (1)
、上記搬送路面上に用紙を吸引して搬送する用紙吸引式
搬送装置において、搬送される用紙サイズの検知手段と
、該検知手段の検知内容に応じて上記吸引孔の開口状態
を変化させる開閉手段を備えることを特徴とする用紙吸
引式搬送装置。In a paper suction conveyance device that suctions the inside of a tank having a plurality of suction holes facing a paper conveyance path to suck and convey paper onto the surface of the conveyance path, a means for detecting the size of the sheet to be conveyed; A paper suction type conveyance device characterized by comprising an opening/closing means for changing the opening state of the suction hole according to the detected contents.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2095512A JPH03293253A (en) | 1990-04-11 | 1990-04-11 | Paper suction type conveyor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2095512A JPH03293253A (en) | 1990-04-11 | 1990-04-11 | Paper suction type conveyor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03293253A true JPH03293253A (en) | 1991-12-24 |
Family
ID=14139635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2095512A Pending JPH03293253A (en) | 1990-04-11 | 1990-04-11 | Paper suction type conveyor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03293253A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008185789A (en) * | 2007-01-30 | 2008-08-14 | Konica Minolta Business Technologies Inc | Transfer material conveyance method, transfer material conveyance apparatus, and image forming apparatus |
JP2010037001A (en) * | 2008-07-31 | 2010-02-18 | Canon Inc | Sheet conveying apparatus and image forming apparatus |
JP2018043886A (en) * | 2012-12-27 | 2018-03-22 | 株式会社エース電研 | Separation collection device |
-
1990
- 1990-04-11 JP JP2095512A patent/JPH03293253A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008185789A (en) * | 2007-01-30 | 2008-08-14 | Konica Minolta Business Technologies Inc | Transfer material conveyance method, transfer material conveyance apparatus, and image forming apparatus |
JP2010037001A (en) * | 2008-07-31 | 2010-02-18 | Canon Inc | Sheet conveying apparatus and image forming apparatus |
US8668197B2 (en) | 2008-07-31 | 2014-03-11 | Canon Kabushiki Kaisha | Sheet conveying apparatus and image forming apparatus |
JP2018043886A (en) * | 2012-12-27 | 2018-03-22 | 株式会社エース電研 | Separation collection device |
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