JPH058466A - Image forming apparatus - Google Patents
Image forming apparatusInfo
- Publication number
- JPH058466A JPH058466A JP18555491A JP18555491A JPH058466A JP H058466 A JPH058466 A JP H058466A JP 18555491 A JP18555491 A JP 18555491A JP 18555491 A JP18555491 A JP 18555491A JP H058466 A JPH058466 A JP H058466A
- Authority
- JP
- Japan
- Prior art keywords
- printing
- sheet
- voltage
- electrostatic attraction
- paper
- 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.)
- Granted
Links
Landscapes
- Handling Of Cut Paper (AREA)
- Ink Jet (AREA)
- Handling Of Sheets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、プリンタやファクシミ
リ等の画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a printer or a facsimile.
【０００２】[0002]
【従来の技術】例えばプリンタにおいて、印字ヘッドの
印字部に搬送される用紙の印字面と前記印字部との間隔
は、１ｍｍ程度にシビアに設定されている。一方、印字
領域で用紙の印字面が浮き上がると、印字乱れが生じて
印字の品質が保証されなくなることから、印字ヘッドに
対して搬送方向の上流側と下流側に配設された搬送手段
によって用紙を搬送させる態勢をとらせて、印字部と印
字面との間隔を保たせた上で印字を開始させ、かつ、上
流側の搬送手段による用紙後端の搬送が解除される直前
までの範囲で印字を終了させるようにしている。2. Description of the Related Art In a printer, for example, a distance between a printing surface of a sheet conveyed to a printing portion of a print head and the printing portion is set to about 1 mm. On the other hand, when the print surface of the paper floats in the print area, the print quality is not assured due to print irregularity. Therefore, the paper is conveyed by the conveying means disposed upstream and downstream of the print head in the conveying direction. To start printing after keeping the space between the printing section and the printing surface, and just before the upstream trailing means cancels the trailing edge of the paper. Printing is finished.
【０００３】[0003]
【発明が解決しようとする課題】このため、用紙先端が
下流側の搬送手段によって搬送作用を受けるまでの間の
用紙先端側の部分と、用紙後端が上流側の搬送手段から
外れた際の用紙後端側の部分が、それぞれ印字を施すこ
とができない印字不能のマージンとなる無駄があった。Therefore, when the leading edge of the sheet is separated from the portion on the leading edge of the sheet until the leading edge of the sheet is transported by the downstream transporting means, and the trailing edge of the sheet is disengaged from the upstream transporting means. There was a waste of the portion on the trailing edge side of the paper, which was an unprintable margin where printing could not be performed.
【０００４】特に、ノズル数が多くなると、各ノズルに
対応させて設けられるピエゾ素子（インクの吐出圧発生
源）の大きさに起因してノズルヘッドが大きくなり、こ
れに伴って印字ヘッドの印字部に対する搬送方向上流側
と下流側の各搬送手段までの配置寸法が大となるもの
で、ノズル数が多くなるほど印字不能のマージンが大き
くなるものであった。Particularly, when the number of nozzles increases, the nozzle head becomes large due to the size of the piezo element (ink ejection pressure generation source) provided corresponding to each nozzle. The arrangement size between the upstream side and the downstream side of the conveying means with respect to the section becomes large, and the larger the number of nozzles, the larger the unprintable margin.
【０００５】もっとも、印字対象の用紙が、例えば社名
や社章等が用紙後端側（あるいは用紙先端側）に印刷さ
れた所謂社内用箋であるような場合は、印字不能マージ
ンが用紙後端側（あるいは用紙先端側）に形成される印
字形態であっても、余り問題にならないケースもある。However, if the paper to be printed is, for example, a so-called in-house memo in which the company name, company emblem, etc. are printed on the trailing edge side of the sheet (or the leading edge side of the sheet), the unprintable margin is the trailing edge side of the sheet. In some cases, even if the print form is formed on the front side of the paper (or the leading edge side of the paper), it does not pose a problem.
【０００６】本発明は、用紙先端側または用紙後端側の
少なくとも一方における印字不能マージンを零にするこ
とができるようにした画像形成装置を提供することを目
的としている。An object of the present invention is to provide an image forming apparatus capable of reducing the unprintable margin on at least one of the leading edge side and the trailing edge side of a sheet to zero.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、画像形成装置において、印字ヘッドに対
して搬送方向の上流側と下流側に、印字時に搬送動作が
停止される搬送手段を配設すると共に、印字時に駆動が
停止されるプラテンローラを前記印字ヘッドの印字部に
対応させて配置し、かつ、当該プラテンローラの表面
に、電圧の印加によって用紙を静電吸着する静電吸着部
材を設けている。In order to achieve the above object, the present invention relates to an image forming apparatus, in which a conveying operation is stopped at the upstream side and the downstream side in the conveying direction with respect to a print head, at the time of printing. And a platen roller whose driving is stopped at the time of printing is arranged corresponding to the printing portion of the print head, and a static electricity electrostatically attracts a sheet to the surface of the platen roller by applying a voltage. An electroadhesive member is provided.
【０００８】そして第１発明では、用紙先端が下流側の
搬送手段によって搬送されるまでの間における印字時
に、前記静電吸着部材に電圧を印加させる用紙先端印字
用の制御手段を設けた点に特徴がある。In the first aspect of the invention, the control means for printing the leading edge of the sheet is provided to apply a voltage to the electrostatic attraction member during printing until the leading edge of the sheet is transported by the downstream transporting means. There are features.
【０００９】第２発明では、上流側の搬送手段が非搬送
下にある状態での印字時に、前記静電吸着部材に電圧を
印加させる用紙後端印字用の制御手段を設けた点に特徴
がある。The second aspect of the present invention is characterized in that a control means for printing the trailing edge of the paper is provided for applying a voltage to the electrostatic attraction member during printing in a state where the upstream side transport means is not transported. is there.
【００１０】第３発明では、用紙先端が下流側の搬送手
段によって搬送されるまでの間における印字時に、前記
静電吸着部材に電圧を印加させる用紙先端印字用の制御
手段と、上流側の搬送手段が非搬送下にある状態での印
字時に、前記静電吸着部材に電圧を印加させる用紙後端
印字用の制御手段とを設けた点に特徴がある。According to the third aspect of the invention, the control means for printing the leading edge of the sheet for applying a voltage to the electrostatic attraction member during printing until the leading edge of the sheet is transported by the downstream transporting means, and the upstream transporting means. It is characterized in that a control means for printing the trailing edge of the sheet is provided for applying a voltage to the electrostatic attraction member during printing in a state where the means is not being conveyed.
【００１１】[0011]
【作用】第１発明の特徴構成によれば、用紙先端が下流
側の搬送手段によって搬送さるまでの間の用紙先端側に
対する印字が、静電吸着部材による用紙先端側の静電吸
着下で行われる。第２発明の特徴構成によれば、用紙後
端が上流側の搬送手段から外れた状態での用紙後端側に
対する印字が、静電吸着部材による用紙後端側の静電吸
着下で行われる。According to the characterizing feature of the first aspect of the invention, printing is performed on the leading edge of the sheet until the leading edge of the sheet is conveyed by the downstream conveying means while the electrostatic attraction member electrostatically attracts the leading edge of the sheet. Be seen. According to the characterizing feature of the second invention, the printing on the trailing edge of the sheet in the state where the trailing edge of the sheet is separated from the upstream conveying means is performed under the electrostatic attraction of the trailing edge of the sheet by the electrostatic attraction member. .
【００１２】そして第３発明の特徴構成によれば、用紙
先端が下流側の搬送手段によって搬送されるまでの間の
用紙先端側に対する印字と、用紙後端が上流側の搬送手
段から外れた状態での用紙後端側に対する印字が、何れ
も静電吸着部材による用紙の静電吸着下で行われる。According to the third aspect of the invention, printing is performed on the leading edge of the sheet until the leading edge of the sheet is transported by the downstream transporting means, and the trailing edge of the sheet is displaced from the upstream transporting means. The printing on the trailing edge side of the sheet is performed under the electrostatic attraction of the sheet by the electrostatic attraction member.
【００１３】即ち、本発明においては、用紙先端側に対
する印字と用紙後端側に対する印字の少なくとも一方の
印字が、印字部と用紙印字面との間隔が規制された状態
で達成される。That is, in the present invention, at least one of the printing on the leading end side of the paper and the printing on the trailing end side of the paper is achieved with the distance between the printing section and the printing surface of the paper being regulated.
【００１４】[0014]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１および図２はインクジェットプリンタの印字
装置を示し、これらの図において、１，２は互いに平行
に設けられたキャリッジステーで、当該キャリッジステ
ー１，２に沿って往復移動自在にキャリッジ３が横架さ
れている。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a printing apparatus of an ink jet printer. In these drawings, reference numerals 1 and 2 denote carriage stays provided in parallel with each other, and a carriage 3 laterally reciprocally moves along the carriage stays 1 and 2. It is hung.
【００１５】４はキャリッジ移動手段で、一方にモータ
Ｍが連設された一対のプーリ５，６にエンドレスベルト
７を巻回し、このベルト７の一部に前記キャリッジ３を
連結してある。８はキャリッジ３に取り付けられた印字
ヘッドで、この印字ヘッド８に対して搬送方向の上流側
と下流側に、それぞれ上下一対のローラから成る搬送手
段９，10が配設されている。Reference numeral 4 denotes a carriage moving means, which winds an endless belt 7 around a pair of pulleys 5 and 6, one of which is provided with a motor M, and the carriage 3 is connected to a part of the belt 7. Reference numeral 8 denotes a print head attached to the carriage 3. On the upstream side and the downstream side of the print head 8 in the transport direction, transporting means 9 and 10 each consisting of a pair of upper and lower rollers are provided.
【００１６】上流側の搬送手段９は、用紙ａの先端側が
印字ヘッド８の印字部11に達するまでは当該用紙ａを連
続搬送し、下流側の搬送手段10は、用紙ａの後端が前記
印字部11を通過して後に当該用紙ａを連続搬送する。そ
して、上記以外の搬送時には、用紙ａに印字が成される
度に間欠的に搬送動作が停止され、かつ、用紙ａの途中
で印字を終了すると、両搬送手段９，10は共に用紙ａを
連続搬送する。The upstream conveying means 9 continuously conveys the sheet a until the leading end side of the sheet a reaches the printing portion 11 of the print head 8, and the downstream conveying means 10 has the rear end of the sheet a. After passing through the printing unit 11, the sheet a is continuously conveyed. Then, at the time of carrying other than the above, the carrying operation is intermittently stopped every time printing is performed on the paper a, and when the printing is finished in the middle of the paper a, both the carrying means 9 and 10 both carry the paper a. Convey continuously.
【００１７】12は印字時に駆動が停止されるプラテンロ
ーラで、前記印字部11に相対応させて両搬送手段９，10
の下部側ローラ間に配置され、このプラテンローラ12に
対して搬送方向の上流側と下流側には、それぞれ通紙ガ
イド板13，14が設けられている。そして、前記プラテン
ローラ12の表面には、電圧の印加によって高電圧が印加
されるほど強く用紙ａを静電吸着する静電吸着部材15が
設けられている。Reference numeral 12 is a platen roller whose drive is stopped at the time of printing.
The sheet guide plates 13 and 14 are provided between the lower rollers of the platen roller 12 and on the upstream side and the downstream side of the platen roller 12 in the transport direction. Further, on the surface of the platen roller 12, there is provided an electrostatic attraction member 15 that electrostatically attracts the paper a as the voltage is applied so that a higher voltage is applied.
【００１８】16は静電吸着部材15に対する電圧電源で、
その電気回路にはスイッチ17が設けられている。18は用
紙ａの先端ならびに後端を検知するセンサーで、このセ
ンサー18による用紙ａの先端ならびに後端の検知情報を
基にして前記スイッチ17をＯＮさせる第１及び第２の制
御手段19，20を設けてある。Reference numeral 16 is a voltage power source for the electrostatic attraction member 15,
A switch 17 is provided in the electric circuit. Reference numeral 18 denotes a sensor for detecting the leading edge and the trailing edge of the sheet a, and the first and second control means 19, 20 for turning on the switch 17 based on the information detected by the sensor 18 for the leading edge and the trailing edge of the sheet a. Is provided.
【００１９】第１の制御手段19は、用紙ａの搬送開始後
で且つ用紙ａ後端が上流側の搬送手段９から外れるまで
の間における印字時にスイッチ17をＯＮさせる。より詳
しくは、用紙ａ先端がプラテンローラ12を越えて下流側
の通紙ガイド板14によってガイド作用を受けるまでの間
は、印字時にのみスイッチ17をＯＮさせ、その後は、用
紙ａ後端が上流側の搬送手段９から外れるまで継続して
スイッチ17をＯＮさせて、前記静電吸着部材15に電圧を
印加させるもので、以下、この制御手段19を用紙先端印
字用の制御手段と言う。The first control means 19 turns on the switch 17 at the time of printing after the conveyance of the sheet a is started and before the trailing edge of the sheet a comes off the conveying means 9 on the upstream side. More specifically, the switch 17 is turned on only during printing until the leading edge of the sheet a passes the platen roller 12 and is guided by the downstream sheet passing guide plate 14, and thereafter, the trailing edge of the sheet a is upstream. The switch 17 is continuously turned on until a voltage is applied to the electrostatic attraction member 15 until it is removed from the side transport means 9. Hereinafter, the control means 19 will be referred to as a control means for printing the leading edge of the sheet.
【００２０】第２の制御手段20は、用紙ａ後端が上流側
の搬送手段９から外れて当該用紙ａ後端がプラテンロー
ラ12を越えるまでの間、前記スイッチ17をＯＮさせて静
電吸着部材15に電圧を印加させるもので、以下、この制
御手段20を用紙後端印字用の制御手段と言う。The second control means 20 turns on the switch 17 until the trailing edge of the sheet a comes off the transport means 9 on the upstream side and the trailing edge of the sheet a passes over the platen roller 12, and electrostatic adsorption is performed. A voltage is applied to the member 15, and the control means 20 is hereinafter referred to as a control means for printing the trailing edge of the sheet.
【００２１】これらの制御手段19，20による静電吸着部
材15への電圧の印加によって当該静電吸着部材15に対す
る用紙ａの静電吸着が成されるもので、用紙ａの先端側
と後端側とに対する印字はもとより用紙ａの中間部に対
する印字が、それぞれ印字部11と用紙印字面との間隔規
制下で行われる。The application of a voltage to the electrostatic attraction member 15 by the control means 19 and 20 causes electrostatic attraction of the sheet a to the electrostatic attraction member 15, and the front side and the rear edge of the sheet a. Not only the printing on the side but also the printing on the intermediate portion of the paper a is performed under the regulation of the distance between the printing unit 11 and the printing surface of the paper.
【００２２】22はインクカートリッジ、23はインクカー
トリッジ22から印字ヘッド８にわたるインクラインで、
インクの残量検知器24が介装されている。25は廃インク
カートリッジである。26は吐出回復装置で、直流モータ
27によって駆動されるポンプ28が接続されている。Reference numeral 22 is an ink cartridge, 23 is an ink line extending from the ink cartridge 22 to the print head 8,
An ink remaining amount detector 24 is provided. 25 is a waste ink cartridge. 26 is a discharge recovery device, a DC motor
A pump 28 driven by 27 is connected.
【００２３】次に、上記の用紙ａ先端側と後端側の印字
を含む一連の印字動作の一例を図３に基づいて説明す
る。Next, an example of a series of printing operations including printing on the leading edge side and the trailing edge side of the paper a will be described with reference to FIG.
【００２４】先ず、プリントスイッチの操作によって搬
送が開始（ステップＳ１）され、用紙ａ先端が印字部11
による第１行目の印字位置に達したことが検出（ステッ
プＳ２）されると、搬送が停止（ステップＳ３）され
る。First, the conveyance is started by operating the print switch (step S1), and the leading end of the sheet a is printed by the printing unit 11.
When it is detected that the print position of the first line has been reached (step S2), the conveyance is stopped (step S3).
【００２５】そして、用紙ａ先端が下流側の通紙ガイド
板14によって支持されていない状態（ステップＳ４）で
あれば、用紙先端印字用の制御手段19が機能して、前記
スイッチ17が所定時間だけＯＮされて静電吸着部材15に
電圧が印加（ステップＳ５）され、この静電吸着部材15
に用紙ａ先端側が静電吸着されると共に、プラテンロー
ラ12の駆動停止下で用紙ａ先端側に対する第１行目の印
字（ステップＳ６）が行われ、かつ、前記スイッチ17が
ＯＦＦされて静電吸着部材15に対する電圧の印加がカッ
ト（ステップＳ７）される。When the leading edge of the sheet a is not supported by the downstream sheet passing guide plate 14 (step S4), the controller 19 for printing the leading edge of the sheet functions and the switch 17 is operated for a predetermined time. Is turned on and a voltage is applied to the electrostatic attraction member 15 (step S5).
The leading end side of the sheet a is electrostatically attracted to the sheet a, and the first line is printed (step S6) on the leading side of the sheet a while the driving of the platen roller 12 is stopped. The application of voltage to the adsorption member 15 is cut (step S7).
【００２６】而して、用紙ａ先端側が静電吸着部材15に
よって静電吸着されて、前記印字部11と用紙ａの印字面
との間隔が規制された状態で印字が行われるので、用紙
ａ先端側に対する印字が乱れなく良好に達成される。ま
た、搬送時には前記静電吸着部材15に対する電圧の印加
がカットされて、当該静電吸着部材15からの紙分離が容
易に行われるので、用紙ａ先端が下流側の通紙ガイド板
14によってガイド作用を受けるまでの用紙ａの搬送がス
ムーズに行われる。Since the leading end side of the paper a is electrostatically attracted by the electrostatic attraction member 15 and printing is performed in a state in which the distance between the printing portion 11 and the printing surface of the paper a is regulated, the paper a Printing on the tip side is not disturbed and is achieved well. Further, since the application of the voltage to the electrostatic attraction member 15 is cut during the transportation, the paper is easily separated from the electrostatic attraction member 15, so that the leading end of the paper a is on the downstream side of the paper passage guide plate.
The sheet 14 is smoothly conveyed until it is guided by the guide 14.
【００２７】この用紙ａに対する印字が１行だけで終了
されるならば、これがステップＳ８で確認されて、当該
用紙ａは図外の排紙トレイに排紙搬送（ステップＳ９）
されることになるが、印字が更に継続されるならば、第
２行目の印字のために用紙ａの搬送（ステップＳ10）が
行われる。If the printing on the paper a is completed by only one line, this is confirmed in step S8, and the paper a is discharged and conveyed to a discharge tray (not shown) (step S9).
If the printing is further continued, the paper a is conveyed (step S10) for printing the second line.
【００２８】この搬送によっても、未だ用紙ａの先端が
下流側の通紙ガイド板14によるガイド作用を受けていな
いことが確認（ステップＳ４）されると、上記した静電
吸着下での印字と非吸着下での用紙搬送が繰り返し行わ
れる。When it is confirmed that the leading end of the sheet a is not yet subjected to the guiding action of the downstream side sheet passing guide plate 14 even by this conveyance (step S4), the printing is performed under the electrostatic attraction described above. Paper conveyance under non-suction is repeated.
【００２９】一方、上記の搬送によって、用紙ａの先端
が下流側の通紙ガイド板14によるガイド作用を受けたこ
とが確認（ステップＳ４）されると、用紙ａ後端が上流
側の搬送手段９から外れるまでは用紙先端印字用の制御
手段19が機能し、かつ、用紙ａ後端が上流側の搬送手段
９から外れて当該用紙ａ後端がプラテンローラ12を越え
るまでの間は、用紙後端印字用の制御手段20が機能し
て、前記静電吸着部材15に電圧が印加（ステップＳ11）
され続ける。On the other hand, when it is confirmed that the leading edge of the sheet a has been guided by the downstream sheet passing guide plate 14 by the above-described transport (step S4), the trailing edge of the sheet a is the upstream transport means. The control means 19 for printing the leading edge of the sheet functions until it comes off from the sheet 9, and until the trailing edge of the sheet a comes off the transporting means 9 on the upstream side and the trailing edge of the sheet a passes over the platen roller 12. The trailing edge printing control means 20 functions to apply a voltage to the electrostatic attraction member 15 (step S11).
Continue to be done.
【００３０】このときの用紙ａ先端側の搬送に際して、
用紙ａ先端は下流側の通紙ガイド板14によって支持され
ているので、前記プラテンローラ12が用紙ａを静電吸着
していても、プラテンローラ12からの用紙ａの剥離が良
好に達成されるのであり、かつ、所定の印字終了が確認
（ステップＳ13）されるまで、１行印字（ステップＳ1
2）と印字行間分の搬送（ステップＳ14）が繰り返し行
われる。At this time, when the leading end side of the sheet a is conveyed,
Since the leading end of the sheet a is supported by the sheet guide plate 14 on the downstream side, even if the platen roller 12 electrostatically adsorbs the sheet a, separation of the sheet a from the platen roller 12 is satisfactorily achieved. And one line is printed (step S1) until the completion of the predetermined printing is confirmed (step S13).
2) and the conveyance between print lines (step S14) are repeated.
【００３１】そして、印字の終了が確認（ステップＳ1
3）されると、前記静電吸着部材15に対する電圧の印加
がカット（ステップＳ15）され、当該用紙ａが図外の排
紙トレイに排紙搬送（ステップＳ９）されるもので、以
上の印字動作で用紙ａ先端側ならびに後端側に対する印
字不能マージンをなくする印字が達成される。Then, the completion of printing is confirmed (step S1
3) Then, the voltage application to the electrostatic attraction member 15 is cut (step S15), and the sheet a is discharged and conveyed to a discharge tray (not shown) (step S9). By the operation, printing can be achieved by eliminating the unprintable margin on the leading edge side and the trailing edge side of the sheet a.
【００３２】尚、前記静電吸着部材15に対する電圧の印
加をステップＳ７でカットさせているが、搬送面で問題
を生じない範囲で当該静電吸着部材15に対する電圧の印
加量をダウンさせる形態とするもよい。Although the application of the voltage to the electrostatic attraction member 15 is cut in step S7, the amount of application of the voltage to the electrostatic attraction member 15 can be reduced within a range that does not cause a problem on the transport surface. You can do it.
【００３３】また、所定の印字終了の確認（ステップＳ
13）後に、静電吸着部材15に対する電圧の印加をカット
（ステップＳ15）させているが、この電圧印加のカット
をステップＳ12による１行印字後に行わせ、かつ、ステ
ップＳ14による印字行間分の搬送後にステップＳ11によ
る電圧印加を行わせるようにして実施可能であり、この
とき、電圧の印加をカットさせるのではなく、電圧の印
加量をダウンさせるようにしてもよい。Confirmation of completion of predetermined printing (step S
After 13), the voltage application to the electrostatic attraction member 15 is cut (step S15). This voltage application is cut after one line is printed in step S12, and the printing line is conveyed in step S14. This can be implemented by performing the voltage application in step S11 later. At this time, the voltage application amount may be reduced instead of cutting off the voltage application.
【００３４】更に、用紙先端印字用の制御手段19と用紙
後端印字用の制御手段20の何れか一方を省略しても本発
明を実施することが可能である。即ち、印字対象の用紙
が、例えば社名や社章等が用紙ａ先端側に印刷された所
謂社内用箋であるような場合は、印字不能マージンが用
紙ａ先端側に形成される印字形態であっても問題はない
ことから、下流側の搬送手段10による搬送開始後に印字
を行わせるように、前記用紙先端印字用の制御手段19を
省略して実施可能であり、あるいは、例えば社名や社章
等が用紙ａ後端側に印刷された所謂社内用箋であるよう
な場合は、印字不能マージンが用紙ａ後端側に形成され
る印字形態であっても問題はないことから、前記用紙後
端印字用の制御手段20を省略して実施可能である。Further, the present invention can be implemented even if either one of the control means 19 for printing the leading edge of the paper and the control means 20 for printing the trailing edge of the paper is omitted. That is, when the paper to be printed is, for example, a so-called in-house memo in which the company name, company emblem, etc. are printed on the leading edge side of the sheet a, it is a printing form in which the unprintable margin is formed on the leading edge side of the sheet a. However, since there is no problem, it is possible to omit the control means 19 for printing the leading edge of the paper so as to perform printing after the conveyance by the conveyance means 10 on the downstream side is started, or, for example, a company name, a company emblem, etc. In the case of a so-called in-house memo printed on the rear end of the paper a, there is no problem even if the unprintable margin is formed on the rear end of the paper a. It can be implemented by omitting the control means 20 for.
【００３５】上記の用紙先端印字用の制御手段19を省略
する際のフローチャートの一例を図４に示す。ここで
は、図３に示すステップＳ２，Ｓ４〜Ｓ８，Ｓ10を省略
し、ステップＳ１による搬送開始後に、用紙ａが所定の
印字位置に到達したか否かを確認させるステップＳ16を
とらせ、かつ、用紙ａが所定の印字位置に到達したこと
が確認（ステップＳ16）されて後に、ステップＳ３，Ｓ
11〜Ｓ15，Ｓ９をとらせるようにしている。FIG. 4 shows an example of a flow chart when the control means 19 for printing the leading edge of the paper is omitted. Here, steps S2, S4 to S8, and S10 shown in FIG. 3 are omitted, and after the start of conveyance in step S1, step S16 for confirming whether or not the sheet a has reached a predetermined printing position is taken, and After it is confirmed that the sheet a has reached the predetermined printing position (step S16), the steps a
11 to S15 and S9 are taken.
【００３６】尚、実施例では、用紙ａの搬送開始後で且
つ用紙ａ後端が上流側の搬送手段９から外れるまでの間
の印字時にスイッチ17をＯＮさせて、前記静電吸着部材
15に電圧を印加させるように用紙先端印字用の制御手段
19を構成しているが、用紙ａ先端が下流側の搬送手段10
によって搬送が開始されるまでの間の印字時に、前記静
電吸着部材15に電圧を印加させるように用紙先端印字用
の制御手段19を構成するもよい。In the embodiment, the switch 17 is turned on at the time of printing after the conveyance of the sheet a is started and before the trailing edge of the sheet a comes off the conveying means 9 on the upstream side, and the electrostatic adsorption member is turned on.
Control means for printing the leading edge of paper so that voltage is applied to 15
19 is configured, and the leading end of the sheet a is a conveying unit 10 on the downstream side.
The control unit 19 for printing the leading edge of the sheet may be configured to apply a voltage to the electrostatic attraction member 15 during printing before the conveyance is started.
【００３７】即ち、用紙ａが搬送方向上流側と下流側の
搬送手段９，10によって搬送される間は、前記静電吸着
部材15に対する電圧の印加を一切カットさせる構成とす
るもよきものである。That is, while the sheet a is being conveyed by the conveying means 9 and 10 on the upstream side and the downstream side in the conveying direction, the voltage application to the electrostatic attraction member 15 may be completely cut off. .
【００３８】[0038]
【発明の効果】以上説明したように本発明の画像形成装
置によれば、用紙先端が少なくとも下流側の搬送手段に
よって搬送作用を受けるまでの間の用紙先端側に対する
印字、あるいは、用紙後端が上流側の搬送手段から外れ
た状態での用紙後端側に対する印字の少なくとも一方
が、静電吸着部材による用紙の静電吸着下で達成される
ので、用紙先端側または後端側の少なくとも一方におけ
る印字不能マージンを零にすることができ、無駄のない
印字が可能となった。As described above, according to the image forming apparatus of the present invention, printing is performed on the leading edge of the sheet or the trailing edge of the sheet is printed until the leading edge of the sheet is conveyed by at least the conveying means on the downstream side. At least one of the printing on the trailing edge of the sheet in the state of being separated from the upstream conveying means is achieved under the electrostatic attraction of the sheet by the electrostatic attracting member, so that at least one of the leading edge side and the trailing edge side of the sheet is The unprintable margin can be reduced to zero, enabling printing without waste.
【図１】インクジェットプリンタの印字装置部分の斜視
図である。FIG. 1 is a perspective view of a printing device portion of an inkjet printer.
【図２】印字装置部分の詳細図である。FIG. 2 is a detailed view of a printing device portion.
【図３】印字形態の一例を示すフローチャートである。FIG. 3 is a flowchart showing an example of a printing form.
【図４】用紙先端印字用の制御手段を省略した印字形態
のフローチャートである。FIG. 4 is a flowchart of a printing mode in which a control unit for printing the leading edge of a sheet is omitted.
８…印字ヘッド、９，10…搬送手段、11…印字部、12…
プラテンローラ、15…静電吸着部材、19，20…制御手
段。8 ... Print head, 9, 10 ... Conveying means, 11 ... Printing section, 12 ...
Platen roller, 15 ... Electrostatic attraction member, 19, 20 ... Control means.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐武 健一 大阪市中央区玉造１丁目２番28号 三田工 業株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kenichi Satake 1-22 Tamatsukuri, Chuo-ku, Osaka Mitako Business
Claims (3)
下流側に、印字時に搬送動作が停止される搬送手段を配
設すると共に、印字時に駆動が停止されるプラテンロー
ラを前記印字ヘッドの印字部に対応させて配置し、か
つ、当該プラテンローラの表面に、電圧の印加によって
用紙を静電吸着する静電吸着部材を設ける一方、用紙先
端が下流側の搬送手段によって搬送されるまでの間にお
ける印字時に、前記静電吸着部材に電圧を印加させる用
紙先端印字用の制御手段を設けてあることを特徴とする
画像形成装置。1. A conveying means for stopping the conveying operation at the time of printing is arranged on the upstream side and the downstream side in the conveying direction with respect to the print head, and a platen roller for stopping the driving at the time of printing is provided on the print head. An electrostatic attraction member, which is arranged corresponding to the printing unit and electrostatically attracts the sheet by applying a voltage, is provided on the surface of the platen roller until the leading edge of the sheet is transported by the downstream transport unit. An image forming apparatus, comprising: a control unit for printing the leading edge of a sheet, which applies a voltage to the electrostatic attraction member during printing in the interval.
下流側に、印字時に搬送動作が停止される搬送手段を配
設すると共に、印字時に駆動が停止されるプラテンロー
ラを前記印字ヘッドの印字部に対応させて配置し、か
つ、当該プラテンローラの表面に、電圧の印加によって
用紙を静電吸着する静電吸着部材を設ける一方、上流側
の搬送手段が非搬送下にある状態での印字時に、前記静
電吸着部材に電圧を印加させる用紙後端印字用の制御手
段を設けてあることを特徴とする画像形成装置。2. A transport means for stopping the transport operation at the time of printing is arranged on the upstream side and the downstream side in the transport direction with respect to the print head, and a platen roller for stopping the drive at the time of printing is provided on the print head. In a state in which the electrostatic attraction member that electrostatically attracts the paper by applying a voltage is provided on the surface of the platen roller while being arranged corresponding to the printing unit, and the upstream transporting device is in the non-transporting state. An image forming apparatus comprising: a control unit for printing a trailing edge of a sheet, which applies a voltage to the electrostatic attraction member during printing.
下流側に、印字時に搬送動作が停止される搬送手段を配
設すると共に、印字時に駆動が停止されるプラテンロー
ラを前記印字ヘッドの印字部に対応させて配置し、か
つ、当該プラテンローラの表面に、電圧の印加によって
用紙を静電吸着する静電吸着部材を設ける一方、用紙先
端が下流側の搬送手段によって搬送されるまでの間にお
ける印字時に、前記静電吸着部材に電圧を印加させる用
紙先端印字用の制御手段と、上流側の搬送手段が非搬送
下にある状態での印字時に、前記静電吸着部材に電圧を
印加させる用紙後端印字用の制御手段とを設けてあるこ
とを特徴とする画像形成装置。3. A conveying means for stopping the conveying operation at the time of printing is arranged on the upstream side and the downstream side of the print head in the conveying direction, and a platen roller for stopping the driving at the time of printing is provided on the print head. An electrostatic attraction member for electrostatically attracting a sheet by applying a voltage is provided on the surface of the platen roller while being arranged corresponding to the printing section, and the leading edge of the sheet is conveyed by a conveying means on the downstream side. A control means for applying a voltage to the electrostatic attraction member at the time of printing in the interval, and a voltage is applied to the electrostatic attraction member at the time of printing in a state where the upstream side transport means is not under transport. An image forming apparatus, comprising: a control unit for printing the trailing edge of the sheet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18555491A JP2676604B2 (en) | 1991-06-29 | 1991-06-29 | Image forming device |
| US07/888,924 US5369424A (en) | 1991-06-06 | 1992-05-27 | Image-forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18555491A JP2676604B2 (en) | 1991-06-29 | 1991-06-29 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH058466A true JPH058466A (en) | 1993-01-19 |
| JP2676604B2 JP2676604B2 (en) | 1997-11-17 |
Family
ID=16172840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18555491A Expired - Lifetime JP2676604B2 (en) | 1991-06-06 | 1991-06-29 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2676604B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6604820B1 (en) | 1998-12-07 | 2003-08-12 | Canon Finetech Inc. | Ink-jet type image forming device |
| EP2228225A1 (en) * | 2009-03-09 | 2010-09-15 | Brother Kogyo Kabushiki Kaisha | Ink-jet recording apparatus |
| US8277039B2 (en) | 2008-03-27 | 2012-10-02 | Seiko Epson Corporation | Inkjet printer and a paper transportation method |
-
1991
- 1991-06-29 JP JP18555491A patent/JP2676604B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6604820B1 (en) | 1998-12-07 | 2003-08-12 | Canon Finetech Inc. | Ink-jet type image forming device |
| US8277039B2 (en) | 2008-03-27 | 2012-10-02 | Seiko Epson Corporation | Inkjet printer and a paper transportation method |
| EP2228225A1 (en) * | 2009-03-09 | 2010-09-15 | Brother Kogyo Kabushiki Kaisha | Ink-jet recording apparatus |
| US8251506B2 (en) | 2009-03-09 | 2012-08-28 | Brother Kogyo Kabushiki Kaisha | Ink-jet recording apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2676604B2 (en) | 1997-11-17 |
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