JPH09290930A - Paper sheet carrying device and printer - Google Patents
Paper sheet carrying device and printerInfo
- Publication number
- JPH09290930A JPH09290930A JP31078196A JP31078196A JPH09290930A JP H09290930 A JPH09290930 A JP H09290930A JP 31078196 A JP31078196 A JP 31078196A JP 31078196 A JP31078196 A JP 31078196A JP H09290930 A JPH09290930 A JP H09290930A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- feed roller
- sheet
- paper feed
- roller
- 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
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、積み重ねて載置さ
れた用紙を下流側へ送り出すとともにその用紙の紙送り
量を正確に制御しつつ更に下流側へと搬送する用紙搬送
装置、およびその用紙搬送装置を備えたプリンタに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device that conveys stacked sheets of paper to the downstream side and conveys the sheets to the further downstream side while controlling the paper feed amount of the sheets accurately. The present invention relates to a printer including a carrying device.
【０００２】[0002]
【従来の技術】従来、インクジェット式プリンタに搭載
される用紙搬送装置として、多数枚の用紙を積み重ねて
収納する給紙カセットと、この給紙カセット中の用紙の
上面に接触する位置で回転して、一回転する毎に用紙を
１枚だけ下流側へ送り出す給紙ローラと、給紙ローラに
よって送り出された用紙の先端に当接してその用紙を一
時的に停止させるとともに、その後、その用紙を吸入し
て印字ヘッドの正面へ送り出す搬送機構とを備えたもの
が知られている。2. Description of the Related Art Conventionally, as a sheet conveying device mounted on an ink jet printer, a sheet feeding cassette for stacking and storing a large number of sheets, and a sheet feeding cassette which rotates at a position in contact with the upper surface of the sheets in the sheet feeding cassette. , A sheet feeding roller that feeds one sheet to the downstream side every one rotation, and temporarily stops the sheet by abutting the leading edge of the sheet fed by the sheet feeding roller, and then sucks the sheet Then, there is known one having a transport mechanism for sending the print head to the front of the print head.
【０００３】この種の用紙搬送装置は、用紙の先端を搬
送機構に当接させて用紙を一時的に停止させることによ
り、用紙先端の位置及び向きを搬送機構に対して正確に
位置決めし、そのあとで搬送機構を作動させることによ
り、搬送機構の作動量に応じて紙送り量を正確に制御し
ようとするものである。In this type of sheet conveying device, the front end of the sheet is brought into contact with the conveying mechanism to temporarily stop the sheet, so that the position and direction of the sheet front end are accurately positioned with respect to the conveying mechanism. By subsequently operating the transport mechanism, the paper feed amount is accurately controlled according to the operation amount of the transport mechanism.
【０００４】ところで、上記用紙搬送装置では、給紙ロ
ーラが用紙を送り出すとともに、その用紙を搬送機構が
吸入するため、給紙ローラ側の送り出し速度と搬送機構
側の吸入速度との関係、あるいは給紙ローラを駆動する
動力伝達機構によっては、給紙ローラ側と搬送機構側と
の間で用紙が引っ張られる状態になり、用紙の搬送機構
への吸入がスムーズになされないことがある。By the way, in the above-described paper transporting apparatus, since the paper is fed by the paper feed roller and the paper is sucked by the transport mechanism, the relationship between the feeding speed on the paper feed roller side and the suction speed on the transport mechanism side, or the feeding speed. Depending on the power transmission mechanism that drives the paper roller, the paper may be pulled between the paper feed roller side and the transport mechanism side, and the paper may not be smoothly sucked into the transport mechanism.
【０００５】そこで、従来より、このような事態を防ぐ
ため、搬送機構に用紙を当接させる際に、給紙ローラか
ら搬送機構に至る搬送経路の距離よりも少し多めに用紙
を送り出し、送り出された用紙が搬送機構との当接に伴
って撓んだ状態になるようにしていた。このようにする
と、仮に搬送機構が用紙を吸入するとき給紙ローラが一
時的に停止しているなど、給紙ローラ側の送り出し速度
よりも搬送機構側の吸入速度が多少勝っていたとして
も、撓み分が延びることにより用紙に過大な張力がかか
らず、用紙の搬送機構への吸入がスムーズになされる。Therefore, conventionally, in order to prevent such a situation, when the sheet is brought into contact with the conveying mechanism, the sheet is sent out a little more than the distance of the conveying path from the sheet feeding roller to the conveying mechanism. In addition, the sheet is bent when it comes into contact with the transport mechanism. By doing so, even if the suction speed on the transport mechanism side is slightly higher than the delivery speed on the paper feed roller side, such as when the paper feed roller is temporarily stopped when the transport mechanism sucks the paper, Due to the extension of the bending amount, excessive tension is not applied to the sheet, and the sheet is smoothly sucked into the transport mechanism.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来技
術によれば、以下に述べるような問題があった。However, the prior art has the following problems.
【０００７】インクジェット式プリンタでの印字に使わ
れる用紙は、比較的薄手の用紙からはがきや封筒等とい
った厚手の用紙まで、その厚さが様々であるが、上記従
来の用紙搬送装置では、厚手の用紙を使った場合に、上
述の如く給紙ローラから搬送機構に至る搬送経路の距離
よりも少し多めに用紙を送り出そうとしても、送り出さ
れた用紙が搬送機構に当接すると、その後は用紙と給紙
ローラとの間でスリップが発生し、用紙が撓んだ状態に
ならないことがあった。そして、このような状況のまま
搬送機構が用紙の吸入を開始すると、上述の如く、給紙
ローラ側と搬送機構側との間で用紙が引っ張られる状
態、すなわち搬送機構による吸入開始時に給紙ローラが
負荷になり、搬送機構による用紙の吸入がスムーズにな
されなくなることがあった。そして、その結果、適正な
紙送りがなされないまま印字が開始され、用紙先端側の
余白が予定よりも少なくなるなど、所期の位置に印字記
録ができない場合があった。The paper used for printing in the ink jet printer has various thicknesses from relatively thin paper to thick paper such as postcards and envelopes. When using paper, even if you try to send the paper a little more than the distance of the transport path from the paper feed roller to the transport mechanism as described above, if the sent paper comes into contact with the transport mechanism, the paper In some cases, a slip occurred between the paper and the paper feed roller, and the paper did not bend. When the transport mechanism starts sucking the paper in such a situation, as described above, the paper is pulled between the paper feed roller side and the transport mechanism side, that is, the paper feed roller is started when the transport mechanism starts suction. Sometimes becomes a load, and the suction of the paper by the transport mechanism may not be performed smoothly. As a result, printing may be started without proper paper feeding, and the margin on the leading end side of the paper may be smaller than planned, and print recording may not be possible at a desired position.
【０００８】本発明は、こうした問題を解決するために
なされたものであり、その目的は、用紙の厚さにかかわ
らずスムーズで正確な紙送りができる用紙搬送装置、お
よびその用紙搬送装置を備えたプリンタを提供すること
にある。The present invention has been made to solve the above problems, and an object of the present invention is to provide a paper transporting device capable of smoothly and accurately feeding a paper regardless of the thickness of the paper, and a paper transporting device thereof. It is to provide a printer.
【０００９】[0009]
【課題を解決するための手段】上述の目的を達成するた
め、本発明の用紙搬送装置は、請求項１記載のとおり、
多数枚の用紙を積み重ねて載置可能な用紙積載部と、該
用紙積載部に載置された用紙の上面に接触する位置で回
転し、その回転に伴って用紙との間に発生する摩擦力で
当該用紙を下流側へ送り出す給紙ローラと、該給紙ロー
ラによって送り出された用紙の先端に当接してその用紙
を一時的に停止させるとともに、その後、当該用紙を下
流側へ搬送する搬送機構とを備えた用紙搬送装置におい
て、前記給紙ローラに送り出された用紙の先端が前記搬
送機構に当接した後に、前記用紙積載部及び／又は前記
給紙ローラを動作させて、一時的に両者の間隔を広げる
間隔拡大手段を設けたことを特徴とする。In order to achieve the above-mentioned object, the sheet conveying device of the present invention is as described in claim 1.
A sheet stacking unit capable of stacking and placing a large number of sheets and a frictional force generated between the sheet stacking unit that rotates at a position in contact with the upper surface of the sheets placed on the sheet stacking unit and the rotation of the sheet. And a paper feed roller that sends the paper to the downstream side, and a transport mechanism that abuts the leading edge of the paper sent by the paper feed roller to temporarily stop the paper and then transports the paper to the downstream side. In a paper transporting device including a paper feed unit, the paper stacking unit and / or the paper feed roller are operated after the tip of the paper sent to the paper feed roller comes into contact with the transport mechanism, and both are temporarily operated. It is characterized in that a space widening means for widening the space is provided.
【００１０】本発明の用紙搬送装置によれば、給紙ロー
ラに送り出された用紙の先端が搬送機構に当接した後
に、間隔拡大手段が用紙積載部又は給紙ローラのいずれ
か一方又は両方（即ち、用紙積載部及び／又は給紙ロー
ラ）を動作させることにより、用紙積載部と給紙ローラ
との間隔を一時的に広げるので、搬送機構が用紙の吸入
を開始したときには、搬送すべき用紙に給紙ローラが圧
接していない。そのため、給紙ローラ側および搬送機構
側の動作速度に関わらず、両者の間で用紙が引っ張られ
る状態、すなわち搬送機構に対して給紙ローラが負荷に
ならず、搬送機構による用紙の吸入がスムーズになされ
る。したがって、常に適正な紙送りがなされ、所期の位
置に印字記録ができるようになる。According to the paper transporting apparatus of the present invention, after the leading edge of the paper fed to the paper feed roller comes into contact with the transport mechanism, the space expanding means either or both of the paper stacking unit and the paper feed roller ( That is, by operating the paper stacking unit and / or the paper feed roller), the space between the paper stacking unit and the paper feed roller is temporarily widened, so that when the transport mechanism starts sucking the paper, the paper to be transported. The feed roller is not pressed against. Therefore, regardless of the operating speed of the paper feed roller side and the transport mechanism side, the paper is pulled between the two, that is, the paper feed roller does not become a load on the transport mechanism, and the paper is smoothly drawn by the transport mechanism. Done Therefore, proper paper feeding is always performed, and print recording can be performed at a desired position.
【００１１】ここで、間隔拡大手段は、用紙積載部又は
給紙ローラのいずれか一方又は両方を動作させることに
より、用紙積載部と給紙ローラとの間隔を一時的に広げ
ることができるものであれば、その具体的な構造につい
ては如何なる構造であってもよいが、より具体的な例を
挙げれば、例えば請求項２記載の如く、前記用紙積載部
を前記給紙ローラ側へ向かって付勢する付勢手段を備
え、前記間隔拡大手段は、前記給紙ローラに連動して回
転するカムを有し、当該カムで前記付勢手段による付勢
力に抗して前記用紙積載部を前記給紙ローラから離れる
方向へ一時的に押し戻すように構成されているとよい。Here, the space expanding means can temporarily widen the space between the paper stacking unit and the paper feed roller by operating either or both of the paper stacking unit and the paper feed roller. If so, the specific structure may be any structure, but as a more specific example, for example, as described in claim 2, the paper stacking unit is attached to the paper feed roller side. Urging means for urging, the interval expanding means has a cam that rotates in conjunction with the paper feed roller, and the cam feeds the paper stacking unit against the urging force of the urging means. It may be configured to be temporarily pushed back in a direction away from the paper roller.
【００１２】この請求項２記載の用紙搬送装置において
は、用紙積載部側が可動構造とされ、この用紙積載部
が、常時は付勢手段によって給紙ローラ側へ向かって付
勢されている。そして、間隔拡大手段が、給紙ローラに
連動して回転するカムにより、付勢手段による付勢力に
抗して用紙積載部を押し戻し、給紙ローラとの間隔を一
時的に広げる。このように構成すると、給紙ローラの回
転角に同期した所定のタイミングで用紙積載部が押し戻
されるので、用紙の搬送位置や搬送速度等を別途検出し
なくても、所定長さだけ用紙を送り出してから間隔拡大
手段を機能させることができる。In the paper conveying apparatus according to the second aspect of the present invention, the paper stacking portion side has a movable structure, and the paper stacking portion is normally urged toward the paper feed roller by the urging means. Then, the interval expanding means pushes back the paper stacking section against the urging force of the urging means by the cam that rotates in conjunction with the paper feeding roller, and temporarily widens the interval with the paper feeding roller. With this configuration, the paper stacking unit is pushed back at a predetermined timing in synchronization with the rotation angle of the paper feed roller, so that the paper is sent out for a predetermined length without separately detecting the paper transport position or the transport speed. After that, the interval expanding means can be operated.
【００１３】またこの場合、特に請求項３記載の如く、
前記カムが、前記給紙ローラと同一回転軸上に設けられ
ていると、歯車等を用いた複雑な機構を使わなくても、
簡単にカムを給紙ローラと連動させることができ、十分
に所期の効果を得ることができる。Further, in this case, particularly as described in claim 3,
If the cam is provided on the same rotary shaft as the paper feed roller, without using a complicated mechanism such as a gear,
The cam can be easily interlocked with the paper feed roller, and the desired effect can be sufficiently obtained.
【００１４】なお、付勢手段としては、通常、コイルバ
ネ、板バネ等のバネ類を採用できるが、この他にも、モ
ータ等を動力源として用紙積載部を前記給紙ローラ側へ
向かって押し上げるものでもよい。また、本発明の用紙
搬送装置は、請求項２記載の構造以外にも、例えば、給
紙ローラ側が可動構造とされ、用紙積載部側から離れる
ものであってもよい。但し、用紙積載部が、用紙の消費
に伴って残りの用紙を順次給紙ローラ側へ持ち上げるよ
うな構造になっている場合には、その構造を逆に動作さ
せれば給紙ローラ側から用紙を離すことができるので、
これとは別に給紙ローラ側を可動構造としなくても十分
に満足な効果が得られる。As the urging means, springs such as a coil spring and a leaf spring can usually be used. In addition to this, a motor or the like is used as a power source to push up the sheet stacking portion toward the sheet feeding roller side. It may be one. Further, in addition to the structure described in claim 2, the paper transporting device of the present invention may have, for example, a movable structure on the paper feed roller side and be separated from the paper stacking unit side. However, if the paper stacking unit has a structure in which the remaining paper is sequentially lifted to the paper feed roller side as the paper is consumed, operating that structure in reverse will cause the paper to be fed from the paper feed roller side. Can be separated,
In addition to this, a sufficiently satisfactory effect can be obtained even if the paper feed roller side does not have a movable structure.
【００１５】また更に、請求項４記載の如く、前記搬送
機構に連動して正逆いずれかの方向へ回転駆動される太
陽歯車と、該太陽歯車の周囲に一対設けられ、それぞれ
が前記太陽歯車と噛み合って自転しながら前記太陽歯車
の周囲を正逆いずれかの方向へ移動する第１、第２の遊
星歯車と、前記太陽歯車の正回転時には前記第１の遊星
歯車と噛み合って正回転する一方、前記太陽歯車の逆回
転時には前記第２の遊星歯車と中間歯車を介して噛み合
って正回転し、前記給紙ローラを正回転させる給紙歯車
とを備え、前記搬送機構による搬送に先立って前記太陽
歯車が逆回転する際に、前記給紙ローラに用紙が送り出
されて用紙の先端が前記搬送機構に当接するとともに、
引き続いて前記間隔拡大手段が前記用紙積載部と前記給
紙ローラとの間隔を広げるように構成すると、常に正方
向へ回転すべき給紙ローラを、正逆両方向へ作動する搬
送機構に連動させることができ、給紙ローラ用と搬送機
構用とでモータを分けなくても、単一のモータで給紙動
作を制御できる。特に、搬送機構が逆方向へ作動して用
紙の搬送を行わない状況下で、用紙の先端が搬送機構に
当接した後、引き続いて間隔拡大手段が用紙積載部と給
紙ローラとの間隔を広げるので、太陽歯車が逆回転から
正回転へ切換って搬送機構が用紙の吸入を開始したとき
には、搬送すべき用紙に給紙ローラが圧接していない。
このため、第１の遊星歯車が給紙歯車に噛合するまでの
間、給紙ローラが一時停止しているなど、搬送機構側と
給紙機構側に動作速度差等があっても、用紙の搬送機構
への吸入が常にスムーズに行われる。Still further, as set forth in claim 4, a sun gear that is rotationally driven in either forward or reverse directions in conjunction with the transport mechanism, and a pair of sun gears are provided around the sun gear, each of which is the sun gear. The first and second planetary gears that move around the sun gear in either forward or reverse directions while meshing with the first and second planetary gears, and positively rotate by meshing with the first planetary gear when the sun gear rotates forward. On the other hand, when the sun gear rotates in the reverse direction, the second planetary gear meshes with the intermediate gear to positively rotate to feed the paper feed roller. When the sun gear rotates in the reverse direction, the paper is fed to the paper feed roller and the leading end of the paper comes into contact with the transport mechanism,
Subsequently, when the interval expanding means is configured to widen the interval between the paper stacking section and the paper feed roller, the paper feed roller that should always rotate in the forward direction is interlocked with the transport mechanism that operates in both the forward and reverse directions. Even if the motors for the paper feed roller and the transport mechanism are not separated, the single motor can control the paper feed operation. In particular, in a situation in which the transport mechanism operates in the opposite direction and does not transport the paper, after the leading edge of the paper comes into contact with the transport mechanism, the gap expanding unit continues to set the gap between the paper stacking unit and the paper feed roller. Because of the widening, when the sun gear switches from the reverse rotation to the forward rotation and the transport mechanism starts sucking the paper, the paper feed roller is not in pressure contact with the paper to be transported.
For this reason, even if there is a difference in operating speed between the transport mechanism side and the paper feed mechanism side, such as the paper feed roller being temporarily stopped until the first planetary gear meshes with the paper feed gear, The suction to the transport mechanism is always smooth.
【００１６】次に、本発明のプリンタは、請求項５記載
のとおり、上述の用紙搬送装置を備え、更に、前記搬送
機構の下流側に、用紙に対して印字する印字ヘッドが配
設されていることを特徴とする。このような構成にすれ
ば、用紙搬送装置が上述のとおり機能し、用紙を印字ヘ
ッドの正面へ正確且つスムーズに搬送することができ、
用紙先端側の所期の位置に印字記録をすることができ
る。According to a fifth aspect of the present invention, the printer of the present invention comprises the above-mentioned sheet conveying device, and further, a print head for printing on a sheet is arranged downstream of the conveying mechanism. It is characterized by being With such a configuration, the sheet conveying device functions as described above, and the sheet can be accurately and smoothly conveyed to the front of the print head.
It is possible to print and record at a desired position on the leading edge side of the paper.
【００１７】このようなプリンタについても、より具体
的な構成は種々考え得るが、例えば請求項６記載の如
く、前記印字ヘッドが、インク滴を噴射して印字するイ
ンクジェット式ヘッドであると、用紙搬送機能に優れた
インクジェット式プリンタを構成できる。With regard to such a printer as well, various more specific configurations are conceivable. For example, when the print head is an ink jet head for ejecting ink droplets for printing, as described in claim 6, the paper is used. It is possible to configure an inkjet printer having an excellent transport function.
【００１８】なお、本発明の用紙搬送装置は、インクジ
ェット式以外の方式の印字ヘッドを備えたプリンタであ
っても搭載できる。また、プリンタに限らず、ファクシ
ミリ装置等に本発明の用紙搬送装置を搭載してもよい。The paper conveying apparatus of the present invention can be installed in a printer having a print head of a method other than the ink jet type. Further, the paper carrying device of the present invention may be mounted not only on the printer but also on a facsimile device or the like.
【００１９】[0019]
【発明の実施の形態】次に、本発明の実施の形態につい
て図面に基づいて説明する。なお、以下に説明する具体
的な装置等は、本発明の実施の形態の一例に過ぎず、本
発明の実施の形態が以下に例示する具体的なものに限ら
れる訳ではない。Next, embodiments of the present invention will be described with reference to the drawings. The specific devices and the like described below are merely examples of the embodiments of the present invention, and the embodiments of the present invention are not limited to the specific examples illustrated below.
【００２０】インクジェット式プリンタ２は、図１に示
すとおり、多数枚の用紙を積み重ねた状態で収容する給
紙カセット４と、回転駆動されるのに伴い給紙カセット
４から用紙を１枚ずつ下流側へ送り出す給紙ローラ６
と、搬送経路の上方に揺動可能に設けられたアーム７
と、アーム７の先端に回転可能に設けられ、アーム７下
方の搬送経路を通過する用紙を上面側から押圧するプレ
ッシャローラ８と、プレッシャローラ８との間に用紙を
挟持しつつ、回転駆動されるのに伴って用紙を印字ヘッ
ド１２の正面へと送り出すフィードローラ１０とを備え
ている。そして、プレッシャローラ８とフィードローラ
１０は、共同して搬送機構を構成している。これらの
内、給紙カセット４は、上面に多数枚の用紙Ｐを積み重
ねて載置する用紙積載部すなわち用紙積載板２３を備
え、用紙積載板２３は、搬送方向上流側端部において支
軸２１を支点に揺動可能に設けられ、下流側端部が付勢
手段すなわちバネ２５によって用紙積載板２３上の用紙
Ｐが給紙ローラ６に当接する方向に付勢されている。こ
の用紙積載板２３には、用紙の幅方向にスライド可能な
載置位置ガイド２４が設けられ、この載置位置ガイド２
４によって用紙を用紙幅に応じて適正な位置に保持する
ことができる。As shown in FIG. 1, the ink jet printer 2 includes a paper feed cassette 4 for accommodating a large number of paper sheets in a stacked state and a paper feed cassette 4 which is driven to rotate so that the paper sheets are fed downstream from the paper feed cassette 4 one by one. Paper feed roller 6 to send to the side
And an arm 7 swingably provided above the transport path.
The pressure roller 8 is rotatably provided at the tip of the arm 7 and presses the sheet passing through the transport path below the arm 7 from the upper side, and the sheet is nipped between the pressure roller 8 and is driven to rotate. And a feed roller 10 for feeding the sheet to the front of the print head 12 as the sheet moves. The pressure roller 8 and the feed roller 10 jointly constitute a transport mechanism. Among these, the paper feed cassette 4 is provided with a paper stacking unit, that is, a paper stacking plate 23 for stacking and mounting a large number of papers P on the upper surface thereof, and the paper stacking plate 23 has a spindle 21 at the upstream end in the transport direction. Is provided so as to be swingable about a fulcrum, and the downstream end is urged in a direction in which the paper P on the paper stacking plate 23 comes into contact with the paper feed roller 6 by urging means, that is, a spring 25. The sheet stacking plate 23 is provided with a placement position guide 24 slidable in the width direction of the sheet.
The sheet 4 can hold the sheet at an appropriate position according to the sheet width.
【００２１】また、給紙ローラ６は、図２に示すよう
に、回転軸２７に対し固定され、回転軸２７の回転に伴
って回転する。この回転軸２７には、給紙ローラ６の他
に、カム２８と、円盤状のスペーサ２９とが設けられて
いる。カム２８は、回転軸２７に対し固定され、回転軸
２７の回転に伴って回転し、その際、用紙積載板２３の
上面の用紙幅範囲外に突設された接触部２３ａに当接し
て、用紙積載板２３を一時的に押し下げる。また、円盤
状のスペーサ２９は、回転軸２７に対し回転自在に設け
られている。給紙ローラ６は、上記スペーサ２９よりも
僅かに径が大きくされた大径外周部６ａと、上記スペー
サ２９よりも径が小さくされた小径外周部６ｂとを有
し、これらの外周部全体が比較的摩擦係数の高いゴムで
形成されている。大径外周部６ａの周方向長さは、用紙
載置板２３の先端からプレッシャローラ８とフィードロ
ーラ１０との接触位置までの距離よりも十分に大きい。
円盤状のスペーサ２９は、給紙ローラが小径外周部６ｂ
を用紙積載板２３側に向けたとき、用紙積載板２３上の
用紙Ｐに当接し、給紙ローラ６と用紙Ｐを所定間隔に保
つ。なお、カム２８と接触部２３ａは間隔拡大手段を構
成する。Further, as shown in FIG. 2, the paper feed roller 6 is fixed to the rotary shaft 27 and rotates with the rotation of the rotary shaft 27. In addition to the paper feed roller 6, a cam 28 and a disk-shaped spacer 29 are provided on the rotary shaft 27. The cam 28 is fixed to the rotary shaft 27, and rotates with the rotation of the rotary shaft 27. At that time, the cam 28 comes into contact with a contact portion 23a provided on the upper surface of the paper stacking plate 23 so as to project outside the paper width range, The paper stacking plate 23 is temporarily pushed down. The disk-shaped spacer 29 is rotatably provided on the rotary shaft 27. The paper feed roller 6 has a large-diameter outer peripheral portion 6a having a diameter slightly larger than that of the spacer 29, and a small-diameter outer peripheral portion 6b having a diameter smaller than that of the spacer 29. It is made of rubber with a relatively high friction coefficient. The circumferential length of the large-diameter outer peripheral portion 6a is sufficiently larger than the distance from the tip of the sheet placing plate 23 to the contact position between the pressure roller 8 and the feed roller 10.
In the disk-shaped spacer 29, the paper feed roller has a small diameter outer peripheral portion 6b.
When the sheet is directed toward the sheet stacking plate 23, the sheet P contacts the sheet P on the sheet stacking plate 23 and keeps the paper feed roller 6 and the sheet P at a predetermined interval. In addition, the cam 28 and the contact portion 23a constitute a space expanding means.
【００２２】また、アーム７は、図１に示すように、支
軸３１を支点に揺動可能に設けられ、バネ３３に付勢さ
れてプレッシャローラ８をフィードローラ１０に押し当
てている。フィードローラ１０は、正逆両方向に回転駆
動されるもので、逆回転（図１において反時計回り）時
には、用紙Ｐの先端がプレッシャローラ８とフィードロ
ーラ１０との接触位置に到達しても用紙Ｐを吸入せず、
その位置で用紙Ｐを一時的に停止させる一方、正回転
（図１において時計回り）時には、プレッシャローラ８
との接触位置に到達している用紙Ｐを直ちに吸入して印
字ヘッド１２の正面へと送り出すことができる。Further, as shown in FIG. 1, the arm 7 is swingably provided with a support shaft 31 as a fulcrum, and is biased by a spring 33 to press the pressure roller 8 against the feed roller 10. The feed roller 10 is driven to rotate in both forward and reverse directions, and during reverse rotation (counterclockwise in FIG. 1), even if the leading edge of the paper P reaches the contact position between the pressure roller 8 and the feed roller 10, the paper is fed. Do not inhale P,
While the paper P is temporarily stopped at that position, the pressure roller 8 is rotated during the forward rotation (clockwise in FIG. 1).
The sheet P reaching the contact position with can be immediately sucked and sent to the front of the print head 12.
【００２３】また、このインクジェット式プリンタ２
は、図３（ａ）に示すように、上記給紙ローラ６および
フィードローラ１０等を回転駆動するための動力伝達機
構として、正逆両方向に回転駆動制御可能なステッピン
グモータ４１と、ステッピングモータ４１の駆動軸に同
軸に固定されて回転駆動されるモータ歯車４２と、モー
タ歯車４２と大径部で噛合して回転駆動される減速歯車
４３と、上記フィードローラ１０の端部に同軸に固定さ
れ、減速歯車４３の小径部と噛合してフィードローラ１
０と一体に回転駆動されるフィード歯車４４と、フィー
ド歯車４４と噛合して回転駆動される太陽歯車４５と、
太陽歯車４５の回転軸を中心に揺動可能に設けられた支
持枠４６と、支持枠４６に一対設けられ、それぞれが太
陽歯車４５と噛合して自転しながら支持枠４６を揺動さ
せ、その揺動に伴い太陽歯車４５の周囲を移動（公転）
する第１遊星歯車４７、および第２遊星歯車４８と、太
陽歯車４５の正回転時には支持枠４６の揺動に伴い第１
遊星歯車４７と噛合して正回転する一方、太陽歯車４５
の逆回転時には支持枠４６の揺動に伴い第２遊星歯車４
８と中間歯車４９を介して噛合して正回転し、前記給紙
ローラ６と一体に回転駆動される給紙歯車５０とを備え
ている。Further, the ink jet printer 2
3A, as a power transmission mechanism for rotationally driving the paper feed roller 6 and the feed roller 10 and the like, a stepping motor 41 capable of rotational drive control in both forward and reverse directions, and a stepping motor 41. Motor gear 42 which is coaxially fixed to the drive shaft and is rotationally driven, reduction gear 43 which is rotationally driven by meshing with motor gear 42 at a large diameter portion, and coaxially fixed to the end portion of feed roller 10. , The feed roller 1 meshing with the small diameter portion of the reduction gear 43
A feed gear 44 that is rotationally driven integrally with 0, and a sun gear 45 that is rotationally driven by meshing with the feed gear 44,
A pair of support frames 46 provided so as to be swingable around the rotation axis of the sun gear 45 and a pair of support frames 46 are respectively engaged with the sun gear 45 to swing while rotating the support frame 46. Move around sun gear 45 (revolution)
The first planetary gear 47, the second planetary gear 48, and the sun gear 45, which rotate forward, rotate with the swinging of the support frame 46.
The planetary gear 47 meshes with the sun gear 45 while rotating in the forward direction.
Of the second planetary gear 4 when the support frame 46 swings during the reverse rotation of
8 and a paper feeding gear 50 that is positively rotated by meshing with an intermediate gear 49 and is rotationally driven integrally with the paper feeding roller 6.
【００２４】次に、このインクジェット式プリンタの給
紙動作について説明する。Next, the paper feeding operation of this ink jet printer will be described.
【００２５】まず、初期状態（即ち、前回の給紙動作が
完了し、且つ次の給紙動作が開始されていない状態）で
は、上記歯車機構が図３（ａ）に示す状態にあり、この
とき、給紙ローラ６は、小径外周部６ｂが用紙Ｐに対向
している。この状態では、図１に示したように、スペー
サ２９が用紙Ｐに当接しているため、給紙ローラ６は、
用紙Ｐから離間している。First, in the initial state (that is, the state in which the previous sheet feeding operation is completed and the next sheet feeding operation is not started), the gear mechanism is in the state shown in FIG. 3 (a). At this time, in the paper feed roller 6, the small-diameter outer peripheral portion 6b faces the paper P. In this state, as shown in FIG. 1, since the spacer 29 is in contact with the paper P, the paper feed roller 6 is
It is separated from the paper P.
【００２６】次に、給紙動作開始時には、ステッピング
モータ４１が、逆方向（図３（ａ）において反時計回
り）に回転駆動され、それに伴い上記歯車機構が動作し
て、フィード歯車４４が図示反時計回りに回転し、これ
と一体に回転するフィードローラ１０も逆回転する。こ
れにより、フィードローラ１０よりも下流側への用紙の
搬送は阻止される状態になる。Next, at the start of the paper feeding operation, the stepping motor 41 is rotationally driven in the reverse direction (counterclockwise in FIG. 3A), and the gear mechanism operates accordingly, and the feed gear 44 is illustrated. The feed roller 10 that rotates counterclockwise and rotates integrally with this rotates in the reverse direction. As a result, the conveyance of the sheet to the downstream side of the feed roller 10 is blocked.
【００２７】一方、このとき、支持枠４６は図示時計回
りに揺動するため、第２遊星歯車４８が中間歯車４９と
噛合し、これと噛合する給紙歯車５０が図示反時計回り
に回転を始め、これと一体に回転する給紙ローラ６も図
示反時計回りに回転を始める。On the other hand, at this time, since the support frame 46 swings clockwise in the drawing, the second planetary gear 48 meshes with the intermediate gear 49, and the paper feed gear 50 meshing with the intermediate gear 49 rotates counterclockwise in the drawing. At the beginning, the paper feed roller 6 which rotates integrally with this also starts to rotate counterclockwise in the drawing.
【００２８】給紙ローラ６が回転を始めると、大径外周
部６ａが用紙Ｐに接触し、用紙Ｐとの間に発生する摩擦
力で用紙Ｐを１枚だけ下流側へ送り出す。用紙Ｐは、所
定長さ分だけ送り出された時点で、プレッシャローラ８
とフィードローラ１０との接触位置に当接する。When the paper feed roller 6 starts to rotate, the large-diameter outer peripheral portion 6a comes into contact with the paper P, and the frictional force generated between the paper and the paper P feeds only one paper P to the downstream side. When the paper P is fed by a predetermined length, the pressure roller 8
And the feed roller 10 are brought into contact with each other.
【００２９】そして、この当接の後も給紙ローラ６が図
３（ｂ）に示す状態まで回転すると、図４に示すよう
に、カム２８が用紙積載板２３の接触部２３ａに当接し
て、用紙積載板２３を図中矢印Ａ方向へ一時的に押し下
げ、用紙Ｐが給紙ローラ６から離間する。また、これと
ほぼ同時期に、ステッピングモータ４１が、当初から所
定ステップ数回転したところで、回転方向を切り替えら
れて正方向（図３（ｃ）において時計回り）に回転駆動
され、それに伴い上記歯車機構が動作して、図３（ｃ）
に示すように、フィード歯車４４が図示時計回りに回転
し、これと一体に回転するフィードローラ１０も正回転
する。これにより、フィードローラ１０よりも下流側へ
の用紙の搬送が開始される。If the paper feed roller 6 rotates to the state shown in FIG. 3B even after this contact, the cam 28 contacts the contact portion 23a of the paper stacking plate 23 as shown in FIG. The paper stacking plate 23 is temporarily pushed down in the direction of arrow A in the figure, and the paper P is separated from the paper feed roller 6. At about the same time, when the stepping motor 41 has rotated a predetermined number of steps from the beginning, the rotation direction is switched and rotationally driven in the forward direction (clockwise in FIG. 3 (c)). The mechanism operates, and Fig. 3 (c)
As shown in, the feed gear 44 rotates clockwise in the drawing, and the feed roller 10 that rotates integrally with the feed gear 44 also rotates forward. As a result, the conveyance of the sheet to the downstream side of the feed roller 10 is started.
【００３０】また、このとき、支持枠４６は図示反時計
回りに揺動するため、第２遊星歯車４８は中間歯車４９
から離間し、今度は第１遊星歯車４７が給紙歯車５０と
噛合する。給紙歯車５０は、第１遊星歯車４７と噛合す
るまでの僅かな時間だけ停止するが、ちょうどこのと
き、用紙Ｐには給紙ローラ６が圧接していないので、給
紙ローラ６側の動作速度「０」に対しフィードローラ１
０側の動作に関わらず、両者の間で用紙Ｐが引っ張られ
る状態にならず、用紙Ｐの吸入がスムーズになされる。
そして、給紙歯車５０は、第１遊星歯車４７と噛合する
と同時に、先ほどと同じく図示反時計回りに回転を始
め、これと一体に回転する給紙ローラ６も図示反時計回
りに回転を始める。At this time, since the support frame 46 swings counterclockwise in the drawing, the second planetary gear 48 moves to the intermediate gear 49.
, And the first planetary gear 47 meshes with the paper feed gear 50. The paper feed gear 50 stops for a short time until it meshes with the first planetary gear 47, but at this time, since the paper feed roller 6 is not in pressure contact with the paper P, the operation of the paper feed roller 6 side Feed roller 1 for speed "0"
Regardless of the operation on the 0 side, the sheet P is not pulled between them and the sheet P is smoothly sucked.
Then, at the same time that the paper feed gear 50 meshes with the first planetary gear 47, the paper feed gear 50 starts to rotate counterclockwise in the drawing as before, and the paper feed roller 6 that rotates integrally therewith also starts to rotate counterclockwise in the drawing.
【００３１】給紙ローラ６が回転を始めると、再び接触
した大径外周部６ａが用紙Ｐを僅かに押し出すととも
に、引き続いて小径外周部６ｂが用紙Ｐと対向する位置
にくるが、既に述べたとおり、小径外周部６ｂは用紙Ｐ
に接触しない。そのため、フィードローラ１０による搬
送開始後には、給紙ローラ６と用紙Ｐとの間に摩擦力が
一切作用しなくなり、給紙ローラ６が如何に動こうとも
フィードローラ１０による搬送に無用な影響を及ぼさな
くなる。When the paper feed roller 6 starts to rotate, the large-diameter outer peripheral portion 6a contacting again pushes out the paper P slightly, and subsequently the small-diameter outer peripheral portion 6b comes to a position facing the paper P. As shown in FIG.
Do not touch. Therefore, after the feed roller 10 starts the conveyance, no frictional force acts between the paper feed roller 6 and the paper P, and no matter how the paper feed roller 6 moves, the feed roller 10 has an unnecessary effect. It will not reach.
【００３２】なお、給紙歯車５０は、第１遊星歯車４７
と噛合する歯が設けられていない欠損部５０ａを有し、
欠損部５０ａが第１遊星歯車４７の位置に到達した時点
で、両者の噛合が解除され、以降はフィードローラ１０
の回転駆動は継続されるが、給紙ローラ６は図３（ａ）
の初期状態の位置で停止し、次回の給紙動作が開始され
るまで回転駆動されることはない。The paper feeding gear 50 is the first planetary gear 47.
Has a defect portion 50a in which a tooth that meshes with is not provided,
When the defective portion 50a reaches the position of the first planetary gear 47, the engagement between the two is released, and thereafter, the feed roller 10
3 is continued, but the paper feed roller 6 is shown in FIG.
Is stopped at the position of the initial state, and is not rotationally driven until the next paper feeding operation is started.
【００３３】本インクジェット式プリンタ２において、
通常の薄手の用紙ならば、プレッシャローラ８とフィー
ドローラ１０との接触位置に当接した後も給紙ローラ６
が図３（ｂ）に示す状態まで回転すると、給紙ローラ６
と搬送機構７との間で用紙が十分な量撓んで、その用紙
の先端がプレッシャローラ８とフィードローラ１０との
接触位置に位置決めされ、かつ傾きが修正される。カム
２８によって用紙Ｐと給紙ローラ６との間隔が一時的に
広げられても、影響なく、用紙先端に所定の余白をおい
た位置から正確に印字記録ができる。In the ink jet printer 2,
In the case of ordinary thin paper, the paper feed roller 6 is kept in contact with the contact position between the pressure roller 8 and the feed roller 10.
Is rotated to the state shown in FIG. 3B, the paper feed roller 6
The sheet is flexed by a sufficient amount between the feeding mechanism 7 and the transport mechanism 7, the leading edge of the sheet is positioned at the contact position between the pressure roller 8 and the feed roller 10, and the inclination is corrected. Even if the space between the paper P and the paper feed roller 6 is temporarily widened by the cam 28, printing can be accurately performed from a position where a predetermined margin is provided at the leading end of the paper without any influence.
【００３４】はがきなどの厚手すなわち剛性の大きい用
紙の場合、上記の撓みが十分にできず、給紙ローラ６が
スリップする。フィードローラ１０が印字ヘッド１２側
へ用紙を搬送する方向へ回転を始めるとき、従来ならば
停止している給紙ローラ６に抗して用紙Ｐを引っ張るこ
とになるが、カム２８がバネ２５の付勢力に抗して用紙
積載板２３を押し下げ、給紙ローラ６との間隔を一時的
に広げるので、用紙Ｐに給紙ローラ６が圧接しておら
ず、給紙ローラ６とフィードローラ１０との間で用紙が
引っ張られる状態にならない。その結果、フィードロー
ラ１０によって常に適正な紙送りがなされ、所期の位置
に印字記録ができる。In the case of a thick paper such as a postcard, that is, a paper having a high rigidity, the above-described bending cannot be sufficiently performed, and the paper feeding roller 6 slips. When the feed roller 10 starts to rotate in the direction in which the paper is conveyed to the print head 12 side, the paper P is pulled against the paper feed roller 6, which is conventionally stopped, but the cam 28 moves the spring 25. Since the sheet stacking plate 23 is pushed down against the urging force and the space between the sheet P and the sheet feed roller 6 is temporarily widened, the sheet P is not in pressure contact with the sheet P, and the sheet feed roller 6 and the feed roller 10 are not in contact with each other. Paper does not get pulled in between. As a result, the paper is always properly fed by the feed roller 10, and print recording can be performed at a desired position.
【００３５】次に、上記カム２８及び接触部２３ａに相
当する構成が、上記具体例（以下、具体例１という）と
は異なる別の具体例（以下、具体例２という）について
説明する。なお、その他の構成については具体例１と同
様なので、具体例１と同じ構成については同じ符号を付
し、重ねての詳細な説明は省略する。Next, another specific example (hereinafter, referred to as specific example 2) in which the configuration corresponding to the cam 28 and the contact portion 23a is different from the specific example (hereinafter referred to as specific example 1) will be described. Since the other configurations are similar to those of the specific example 1, the same configurations as those of the specific example 1 are denoted by the same reference numerals, and detailed description thereof will not be repeated.
【００３６】具体例２のインクジェット式プリンタは、
図５に示すように、給紙ローラ６の設けられた回転軸２
７に、２つのカム２８ａ、２８ｂを備えている。また、
用紙積載板２３に設けられた載置位置ガイド２４から、
上記具体例１の接触部２３ａに相当する接触片２４ａが
延出されている。The ink jet printer of Example 2 is
As shown in FIG. 5, the rotary shaft 2 provided with the paper feed roller 6
7 is provided with two cams 28a and 28b. Also,
From the placement position guide 24 provided on the sheet stacking plate 23,
A contact piece 24a corresponding to the contact portion 23a of the first specific example is extended.
【００３７】つまり、上記具体例１では、カム２８及び
接触部２３ａの位置がともに不変であったのに対し、具
体例２では、接触片２４ａが載置位置ガイド２４に追従
してスライドするため、載置位置ガイド２４が特定位置
に移動したときにのみ、接触片２４ａとカム２８ａ（又
はカム２８ｂ）とが接触し、それ以外の位置に載置位置
ガイド２４が移動したときには、接触片２４ａとカム２
８ａ（又はカム２８ｂ）とが接触しない構造とされてい
る。That is, in the first specific example, the positions of the cam 28 and the contact portion 23a were both unchanged, whereas in the second specific example, the contact piece 24a slides following the mounting position guide 24. The contact piece 24a contacts the cam 28a (or the cam 28b) only when the mounting position guide 24 moves to a specific position, and the contact piece 24a contacts the mounting position guide 24 when it moves to other positions. And cam 2
8a (or cam 28b) does not come into contact with the structure.
【００３８】ここで、本具体例では、はがきを横置きす
るための位置に載置位置ガイド２４をスライドさせた際
に接触片２４ａに当接する位置にカム２８ａが設けら
れ、はがきを縦置きするための位置に載置位置ガイド２
４をスライドさせた際に接触片２４ａに当接する位置に
カム２８ｂが設けられている。そのため、給紙カセット
４にはがきをセットした場合にだけ、カム２８ａ（又は
カム２８ｂ）が用紙積載板２３を一時的に押し下げて給
紙ローラ６側の圧接を解除する一方、給紙カセット４に
その他の用紙をセットした場合には、カム２８ａ、２８
ｂがいずれも機能しない。Here, in this example, a cam 28a is provided at a position where it comes into contact with the contact piece 24a when the mounting position guide 24 is slid to a position for horizontally placing the postcard, and the postcard is vertically placed. Placement guide 2 at the position for
A cam 28b is provided at a position where the cam 28b comes into contact with the contact piece 24a when the 4 is slid. Therefore, only when the postcard is set in the paper feed cassette 4, the cam 28a (or the cam 28b) temporarily pushes down the paper stacking plate 23 to release the pressure contact on the paper feed roller 6 side, and If other paper is loaded, the cams 28a, 28
b does not work either.
【００３９】このように構成すると、比較的厚手でスム
ーズな紙送りが困難なはがきについては、上記具体例１
で説明したものと同様にスムーズに紙送りができるよう
になる。With this structure, for a postcard that is relatively thick and difficult to feed smoothly, the above-mentioned specific example 1 is used.
The paper can be fed smoothly as described in the above.
【００４０】一方、はがきサイズ以外の通常の薄手の用
紙の場合、載置位置ガイド２４の接触片２４ａがカム２
８と対向していないため、図示のようにカム２８の外周
が給紙ローラ６よりも突出しているものでは、カム２８
が用紙側まで回転してきたとき、用紙載置板２３との間
に用紙を挟んでしまう。しかし、上記具体例１で説明し
たように用紙に十分な撓みが形成されており、フィード
ローラ１０が用紙の吸入を開始しても、撓み分が延ばさ
れる間に給紙ローラ６が回転を再開するので、支障を生
じない。したがって用紙先端に所定の余白をおいた位置
から正確に印字記録ができる。On the other hand, in the case of ordinary thin paper other than the postcard size, the contact piece 24a of the placement position guide 24 has the cam 2
8 does not face the cam 28, the cam 28 does not have the outer periphery protruding from the paper feed roller 6 as shown in the figure.
When the sheet rotates to the sheet side, the sheet is sandwiched between the sheet stacking plate 23 and the sheet. However, as described in the specific example 1, the sheet is sufficiently bent, and even if the feed roller 10 starts sucking the sheet, the paper feed roller 6 restarts to rotate while the amount of the bending is extended. Therefore, there is no problem. Therefore, it is possible to accurately print and record from a position where a predetermined margin is provided on the leading edge of the paper.
【００４１】具体例２において、カム２８ａ、２８ｂの
外周が給紙ローラ６よりも突出しているが、給紙ローラ
６と対向する載置板２３上の位置を、カム２８ａ、２８
ｂと対向する位置よりも、上記突出量よりわずか高くす
る。例えば図６に具体例３として示すように、載置板２
３上に摩擦部材２３ｂを突出して設け、載置位置ガイド
２４がはがきサイズ以外の位置にあるとき、用紙Ｐは給
紙ローラ６に強く当接するが、カム２８ａ、２８ｂが用
紙Ｐを強く押すことがないようにする。これにより、フ
ィードローラ１０とプレッシャローラ８とで下流側へ送
り出すまで給紙ローラ６により用紙Ｐの両ローラ１０、
８の接触部への圧接を維持し、より一層用紙の先頭位置
の位置決めを確実にするとともに傾き等が発生しないよ
うにすることができる。なお、摩擦部材２３ｂは、最も
下の用紙を摩擦力で載置板２３上に拘束して、載置板２
３上の用紙が少ないとき、数枚まとまって送り出される
ことを防止するものである。In the specific example 2, the outer circumferences of the cams 28a and 28b are projected from the paper feed roller 6, but the positions on the mounting plate 23 facing the paper feed roller 6 are set to the cams 28a and 28b.
The protrusion amount is set slightly higher than the position facing b. For example, as shown as a specific example 3 in FIG.
When the mounting position guide 24 is located at a position other than the postcard size, the paper P strongly abuts the paper feed roller 6, but the cams 28a and 28b strongly press the paper P. So that there is no As a result, both rollers 10 of the paper P are fed by the paper feed roller 6 until they are fed to the downstream side by the feed roller 10 and the pressure roller 8.
It is possible to maintain pressure contact of the contact portion 8 with the contact portion 8 to further ensure the positioning of the leading position of the sheet and prevent the occurrence of inclination or the like. The friction member 23b restrains the lowermost sheet on the mounting plate 23 by frictional force, and
When the number of sheets on the sheet 3 is small, it is possible to prevent the sheets from being fed out together.
【００４２】また各具体例において、図７に具体例４と
して示すように、カム２８、２８ａ、２８ｂの外周を給
紙ローラ６よりもわずか小径にするようにしてもよい。
特に具体例２および３において、載置位置ガイド２４が
はがきサイズ以外の位置にあるとき、カムが用紙Ｐおよ
び載置板２３と当接することがなくなり、用紙Ｐの最後
の１枚でも、フィードローラ１０とプレッシャローラ８
とで下流側へ送り出すまで給紙ローラ６により両ローラ
１０、８の接触部への圧接を確実に維持することができ
る。Further, in each specific example, as shown as a specific example 4 in FIG. 7, the outer circumference of the cams 28, 28a, 28b may be made slightly smaller than the paper feed roller 6.
Particularly in the specific examples 2 and 3, when the loading position guide 24 is located at a position other than the postcard size, the cam does not come into contact with the paper P and the loading plate 23, and even the last sheet of the paper P can be fed by the feed roller. 10 and pressure roller 8
With the above, it is possible to reliably maintain the pressure contact of the rollers 10 and 8 to the contact portion by the paper feed roller 6 until the paper is fed to the downstream side.
【００４３】以上、本発明の具体例について説明した
が、本発明の具体的な構成については上記具体例以外に
も種々考えられる。Although specific examples of the present invention have been described above, various specific configurations of the present invention are possible other than the specific examples described above.
【００４４】例えば、各具体例では、フィードローラ１
０が回転を始める瞬間、給紙ローラ６の速度が「０」に
なるが、給紙ローラの駆動源をフィードローラとは別に
して、上記瞬間も給紙ローラ６をフィードローラよりも
低速度で回転することもできる。For example, in each specific example, the feed roller 1
The speed of the paper feed roller 6 becomes "0" at the moment 0 starts to rotate, but the drive source of the paper feed roller is separated from the feed roller and the speed of the paper feed roller 6 is lower than that of the feed roller at that moment as well. You can also rotate with.
【００４５】また、上記具体例では、本発明の用紙搬送
装置をインクジェットプリンタに搭載する例を示した
が、他の印字方式を採用したプリンタに搭載してもよい
し、プリンタ以外の装置（例えばファクシミリ装置な
ど）に搭載してもよい。Further, in the above-mentioned specific example, an example in which the paper transporting device of the present invention is installed in an ink jet printer may be installed in a printer adopting another printing method, or a device other than the printer (eg, a printer). It may be installed in a facsimile machine).
【図１】本発明の用紙搬送装置を搭載したインクジェッ
ト式プリンタの要部の概略構成を示す縦断面図。FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a main part of an ink jet printer equipped with a sheet transport device of the present invention.
【図２】図１をＢ方向から見た平面図。FIG. 2 is a plan view of FIG. 1 viewed from a B direction.
【図３】給紙ローラ等を駆動するための歯車機構の側面
図。FIG. 3 is a side view of a gear mechanism for driving a paper feed roller and the like.
【図４】給紙ローラによる用紙の送り出し状態を示す説
明図。FIG. 4 is an explanatory diagram showing a state in which a sheet is fed by a sheet feeding roller.
【図５】別の具体例における図２相当の平面図。FIG. 5 is a plan view corresponding to FIG. 2 in another specific example.
【図６】さらに別の具体例において図５をＣ方向から見
た正面図。FIG. 6 is a front view of FIG. 5 viewed from the direction C in yet another specific example.
【図７】さらに別の具体例における図１相当の一部拡大
従断面図。7 is a partially enlarged sub-sectional view corresponding to FIG. 1 in yet another specific example.
４・・・給紙カセット、６・・・給紙ローラ、８・・・
プレッシャローラ、１０・・・フィードローラ、１２・
・・印字ヘッド、２３・・・用紙積載板、２３ａ・・・
接触部、２４・・・載置位置ガイド、２４ａ・・・接触
片、２５・・・バネ、２８，２８ａ，２８ｂ・・・カ
ム、２９・・・スペーサ、４５・・・太陽歯車、４７・
・・第１遊星歯車、４８・・・第２遊星歯車、４９・・
・中間歯車、５０・・・給紙歯車。4 ... Paper feeding cassette, 6 ... Paper feeding roller, 8 ...
Pressure roller, 10 ... Feed roller, 12 ...
..Print head, 23 ... Paper stacking plate, 23a ...
Contact portion, 24 ... Placement position guide, 24a ... Contact piece, 25 ... Spring, 28, 28a, 28b ... Cam, 29 ... Spacer, 45 ... Sun gear, 47 ...
..First planetary gears, 48 ... Second planetary gears, 49 ...
-Intermediate gear, 50 ... Paper feed gear.
Claims (6)
紙積載部と、該用紙積載部に載置された用紙の上面に接
触する位置で回転し、その回転に伴って用紙との間に発
生する摩擦力で当該用紙を下流側へ送り出す給紙ローラ
と、該給紙ローラによって送り出された用紙の先端に当
接してその用紙を一時的に停止させるとともに、その
後、当該用紙を下流側へ搬送する搬送機構とを備えた用
紙搬送装置において、 前記給紙ローラに送り出された用紙の先端が前記搬送機
構に当接した後に、前記用紙積載部及び／又は前記給紙
ローラを動作させて、一時的に両者の間隔を広げる間隔
拡大手段を設けたことを特徴とする用紙搬送装置。1. A paper stacking unit capable of stacking and mounting a large number of paper sheets, and a space between the paper stacking unit that rotates at a position in contact with the upper surface of the paper stacked on the paper stacking unit The paper feed roller that sends the paper to the downstream side by the frictional force generated on the paper and the leading end of the paper sent by the paper feed roller to temporarily stop the paper, and then the paper to the downstream side. A paper transporting device for transporting the paper to the paper feed roller, the paper stacking unit and / or the paper feed roller is operated after the leading edge of the paper sent to the paper feed roller comes into contact with the transport mechanism. A sheet conveying device provided with an interval expanding means for temporarily expanding the interval between the two.
付勢手段を備え、 前記間隔拡大手段は、前記給紙ローラに連動して回転す
るカムを有し、当該カムで前記付勢手段による付勢力に
抗して前記用紙積載部を前記給紙ローラから離れる方向
へ一時的に押し戻すように構成されていることを特徴と
する用紙搬送装置。2. The sheet transporting device according to claim 1, further comprising a biasing unit that biases the sheet stacking unit toward the sheet feeding roller, and the gap expanding unit interlocks with the sheet feeding roller. And a cam that rotates in a rotating manner, and is configured to temporarily push back the paper stacking portion in a direction away from the paper feed roller against the biasing force of the biasing means by the cam. Paper transport device.
ていることを特徴とする用紙搬送装置。3. The sheet conveying apparatus according to claim 2, wherein the cam is provided on the same rotation shaft as the sheet feeding roller.
用紙搬送装置において、 前記搬送機構に連動して正逆いずれかの方向へ回転駆動
される太陽歯車と、 該太陽歯車の周囲に一対設けられ、それぞれが前記太陽
歯車と噛み合って自転しながら前記太陽歯車の周囲を正
逆いずれかの方向へ移動する第１、第２の遊星歯車と、 前記太陽歯車の正回転時には前記第１の遊星歯車と噛み
合って正回転する一方、前記太陽歯車の逆回転時には前
記第２の遊星歯車と中間歯車を介して噛み合って正回転
し、前記給紙ローラを正回転させる給紙歯車とを備え、 前記搬送機構による搬送に先立って前記太陽歯車が逆回
転する際に、前記給紙ローラに用紙が送り出されて用紙
の先端が前記搬送機構に当接するとともに、引き続いて
前記間隔拡大手段が前記用紙積載部と前記給紙ローラと
の間隔を広げることを特徴とする用紙搬送装置。4. The sheet conveying apparatus according to claim 1, wherein the sun gear is rotatably driven in either forward or reverse directions in conjunction with the conveying mechanism, and a periphery of the sun gear. A pair of first and second planetary gears, each of which meshes with the sun gear and rotates around the sun gear in either forward or reverse directions while rotating on its own axis; The first planetary gear meshes positively with the first planetary gear, while the second planetary gear meshes with the second planetary gear through an intermediate gear to positively rotate when the sun gear rotates in the reverse direction. When the sun gear reversely rotates before being conveyed by the conveying mechanism, the sheet is fed to the paper feed roller so that the leading end of the sheet abuts against the conveying mechanism, and subsequently the gap expanding means is for Sheet conveying apparatus characterized by widening the distance between the feed roller and the load unit.
用紙搬送装置を備え、 更に、前記搬送機構の下流側に、用紙に対して印字する
印字ヘッドが配設されていることを特徴とするプリン
タ。5. A sheet conveying device according to claim 1, further comprising a print head disposed downstream of the conveying mechanism for printing on a sheet. Characteristic printer.
ジェット式ヘッドであることを特徴とするプリンタ。6. The printer according to claim 5, wherein the print head is an ink jet head that ejects ink droplets for printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31078196A JP3818403B2 (en) | 1996-02-28 | 1996-11-21 | Paper transport device and printer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4156996 | 1996-02-28 | ||
| JP8-41569 | 1996-02-28 | ||
| JP31078196A JP3818403B2 (en) | 1996-02-28 | 1996-11-21 | Paper transport device and printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09290930A true JPH09290930A (en) | 1997-11-11 |
| JP3818403B2 JP3818403B2 (en) | 2006-09-06 |
Family
ID=26381208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31078196A Expired - Fee Related JP3818403B2 (en) | 1996-02-28 | 1996-11-21 | Paper transport device and printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3818403B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001192130A (en) * | 2000-01-05 | 2001-07-17 | Hewlett Packard Co <Hp> | Pickup mechanism and method of performing pickup cycle |
| US7628394B2 (en) | 2006-01-24 | 2009-12-08 | Brother Kogyo Kabushiki Kaisha | Feeder and printer |
-
1996
- 1996-11-21 JP JP31078196A patent/JP3818403B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001192130A (en) * | 2000-01-05 | 2001-07-17 | Hewlett Packard Co <Hp> | Pickup mechanism and method of performing pickup cycle |
| JP4588204B2 (en) * | 2000-01-05 | 2010-11-24 | ヒューレット・パッカード・カンパニー | Pickup mechanism and method of performing pickup cycle |
| US7628394B2 (en) | 2006-01-24 | 2009-12-08 | Brother Kogyo Kabushiki Kaisha | Feeder and printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3818403B2 (en) | 2006-09-06 |
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