JPH03102019A - Paper feeding device - Google Patents
Paper feeding deviceInfo
- Publication number
- JPH03102019A JPH03102019A JP1240428A JP24042889A JPH03102019A JP H03102019 A JPH03102019 A JP H03102019A JP 1240428 A JP1240428 A JP 1240428A JP 24042889 A JP24042889 A JP 24042889A JP H03102019 A JPH03102019 A JP H03102019A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- cam member
- paper feeding
- paper feed
- pressure increasing
- 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
- 238000012840 feeding operation Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、レーザービームプリンタ（以下Ｌ ＢＰと略
する）及び複写機等の画像形或装置における給紙装置に
関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a paper feeding device in an image forming apparatus such as a laser beam printer (hereinafter abbreviated as LBP) and a copying machine.
（口）従来の技術
従来のこの種の画像形成装置、例えばＬＢＰの給紙装置
の一例を第９図及び第１０図にそれぞれ示す。(BACKGROUND) An example of a paper feeding device for a conventional image forming apparatus of this type, such as an LBP, is shown in FIGS. 9 and 10, respectively.
同図において、給紙装置の給紙軸５には、円孤状の周面
を有する給紙ローラ６と、従動ローラ７、及び複数のカ
ム部材５１が同時上に設けられている．用紙Ｐ〈第１３
図参照）の先端が積載されている中板９の両端には１対
の中板アーム１０がそれぞれ固着されている。上記中板
アーム１０は、軸１１により回動自在に枢支されており
、両端を中板アーム１０と固定部材ｌ２とにそれぞれ圧
接している圧縮ばね１３の弾力により、中板アーム１０
の当接部１０ａは前記カム部材５１の周面に当接してい
る。In the figure, a paper feed roller 6 having an arc-shaped peripheral surface, a driven roller 7, and a plurality of cam members 51 are simultaneously provided on a paper feed shaft 5 of a paper feed device. Paper P〈13th
A pair of intermediate plate arms 10 are fixed to both ends of the intermediate plate 9, on which the tips of the intermediate plate 9 (see figure) are loaded. The intermediate plate arm 10 is rotatably supported by a shaft 11, and the intermediate plate arm 10 is
The contact portion 10a is in contact with the circumferential surface of the cam member 51.
中板アーム１０の下流側には摩擦分離部材１５が配設さ
れていて、両端を摩擦分離部材１５の保持部材１５ａと
固定部材１６とにそれぞれ圧接している圧縮ばね１７の
弾力により従動ローラ７に圧接している。上記従動ロー
ラ７には搬送ローラ１９が当接していて、給送される用
紙Ｐの搬送を行なう。A friction separation member 15 is disposed on the downstream side of the intermediate plate arm 10, and the driven roller 7 is moved by the elasticity of a compression spring 17 whose both ends are in pressure contact with the holding member 15a and the fixing member 16 of the friction separation member 15, respectively. is in pressure contact with. A conveyance roller 19 is in contact with the driven roller 7, and conveys the fed paper P.
第１０図に示すように、給紙軸５の端部には給紙クラッ
チＢが配設されていて、給紙軸５に固着されたリング２
０と接続されている．上記給紙クラッチＢは、給紙軸５
に回転自在に装着された給紙ギャ２１、給紙ギャ２１の
ボスとリング２２間に配設されたクラッチばね２３及び
クラッチばね２３に係合・解除する給紙ソレノイド２５
等から構或されている。As shown in FIG. 10, a paper feed clutch B is disposed at the end of the paper feed shaft 5, and a ring 2 is fixed to the paper feed shaft 5.
Connected to 0. The paper feed clutch B is connected to the paper feed shaft 5
A paper feed gear 21 rotatably mounted on the paper feed gear 21, a clutch spring 23 disposed between the boss of the paper feed gear 21 and the ring 22, and a paper feed solenoid 25 that engages and releases the clutch spring 23.
It is constructed from etc.
上記給紙クラッチＢは、リング２２が給紙ソレノイド２
５により係合されているときには解除された状態にあり
、また給紙ソレノイド２５が作動してリング２２を釈放
したときには作動状態にあって、給紙軸５が一方向に１
回転だけ回転される。給紙軸５１かて後は、再び給紙ソ
レノイド２５によりリング２２が係合されて給紙クラッ
チＢは解除されて、給紙軸５は停止する。なお、上記給
紙ギャ２１には、第１２図に示すように前記搬送ローラ
１９と一体の駆動ギャ２６が噛合してそれぞれ矢印方向
に回転している。In the paper feed clutch B, the ring 22 is connected to the paper feed solenoid 2.
When the paper feed solenoid 25 is activated and releases the ring 22, it is in the released state, and when the paper feed solenoid 25 is actuated to release the ring 22, it is in the activated state, and the paper feed shaft 5 is moved in one direction.
Only the rotation is rotated. After the paper feed shaft 51 is finished, the ring 22 is again engaged by the paper feed solenoid 25, the paper feed clutch B is released, and the paper feed shaft 5 is stopped. Note that, as shown in FIG. 12, a drive gear 26 that is integral with the conveyance roller 19 is engaged with the paper feed gear 21 and rotates in the direction of the arrow.
上記給紙クラッチＢが解除状態にあるときには、中板ア
ーム１０は第９図（ａ）に示すようにカム部材５１によ
り押し下げられていて、中板９上の用紙には給紙圧が作
用していない状態にある。When the paper feed clutch B is in the released state, the middle plate arm 10 is pressed down by the cam member 51 as shown in FIG. 9(a), and paper feed pressure acts on the paper on the middle plate 9. It is in a state where it is not.
また、給紙ローラ６はピックアップポイントまで所定の
角度を有するようなスタンバイ状態の位置に保持されて
いる。Further, the paper feed roller 6 is held in a standby position at a predetermined angle up to the pickup point.
いま、給紙ソレノイド２５に給紙信号が入って給紙クラ
ッチＢが作動すると、空転している給紙ギャ２ｌの回転
がリング２２、リング２０を介して給紙軸５に伝達され
て給紙軸５及びこれと一体の給紙ローラ６、カム部材５
１が矢印方向に回転する。第９図（ｂ）に示すように、
給紙軸５の回転に従動して中板アーム１０か上昇して、
回動してきた給紙ローラ６の周面に用紙を圧接させて用
紙を給紙させる。給紙された用紙は、摩擦分離部材ｌ５
により分離され、さらに搬送ローラ１９、従動ローラ７
により搬送されていく。Now, when a paper feed signal is input to the paper feed solenoid 25 and the paper feed clutch B is activated, the rotation of the idling paper feed gear 2l is transmitted to the paper feed shaft 5 via the rings 22 and 20, and the paper is fed. A shaft 5, a paper feed roller 6 integrated therewith, and a cam member 5
1 rotates in the direction of the arrow. As shown in Figure 9(b),
Following the rotation of the paper feed shaft 5, the middle plate arm 10 rises,
The paper is brought into pressure contact with the circumferential surface of the rotating paper feed roller 6 to feed the paper. The fed paper passes through the friction separation member l5
further separated by the conveying roller 19 and the driven roller 7.
It is transported by.
以上の一連の給紙動作が終了したのちには、給紙ソレノ
イド２５が不作動になって給紙クラッチＢが解除される
ことによって、給紙軸５及び給紙ローラ６、カム部材５
１がスタンバイ状態に保持されて、次の給紙信号がくる
まで第９図（ａ）の状態を保持している。After the above series of paper feeding operations are completed, the paper feeding solenoid 25 is deactivated and the paper feeding clutch B is released, so that the paper feeding shaft 5, the paper feeding roller 6, the cam member 5
1 is held in a standby state, and the state shown in FIG. 9(a) is maintained until the next paper feed signal arrives.
（ハ）発明が解決しようとする課題
しかしながら、上述した従来例においては、第９図（ａ
）に示すように給紙動作が終了して、搬送ローラ１９従
動ローラ７により用紙を搬送している状Ｂ（以下用紙搬
送状態という）にあるとき、あるいは、給紙動作前・用
紙搬送状態後の空転状態にあるときにおいて、給紙クラ
ッチＢと給紙ソレノイド２５により停止状態に保持され
ている給紙軸５には、次の２種類の摺動抵杭によるトル
クが加わる．
一つのトルクは、第１１図に示すように、摩擦分離部材
１５と搬送ローラ１９により常に圧をうけながら回転す
る従動ローラ７と給紙軸５との摺動部での摺動抵抗であ
る。他のトルクは、第１２図に示すような給紙クラッチ
Ｂと一体となった給紙ギャ２１が駆動ギャ２６により駆
動されるときの給紙軸５との摺動部での摺動抵抗である
。(C) Problems to be Solved by the Invention However, in the above-mentioned conventional example, FIG.
), when the paper feeding operation has finished and the paper is being transported by the transport roller 19 and the driven roller 7 (hereinafter referred to as the paper transport state), or before the paper feeding operation or after the paper transport state. When it is in the idling state, the following two types of sliding resistance piles apply torque to the paper feed shaft 5, which is held in a stopped state by the paper feed clutch B and the paper feed solenoid 25. As shown in FIG. 11, one type of torque is the sliding resistance at the sliding portion of the paper feed shaft 5 and the driven roller 7, which rotates under constant pressure from the friction separation member 15 and the conveyance roller 19. The other torque is due to the sliding resistance at the sliding part with the paper feed shaft 5 when the paper feed gear 21 integrated with the paper feed clutch B is driven by the drive gear 26 as shown in FIG. be.
さて、上記のような給紙軸５に作用する摺動抵杭による
トルクが、摺動部の打痕や傷又は削れ等の損壊部により
増大し、さらに給紙軸５をスタンバイ状態に保持するた
めのトルク（この場合は、給紙軸５とその軸受との摩擦
抵抗トルク、カム部材５１と中板９との摺動部における
摩擦抵抗トルク、及び給紙クラッチＢ内の給紙ギャ２１
によるトルク等）よりも大きくなった場合には、給紙軸
５がつれ回りを起こす。Now, the torque due to the sliding resistance pile acting on the paper feed shaft 5 as described above increases due to damage such as dents, scratches, or scrapes on the sliding part, and furthermore, the paper feed shaft 5 is held in a standby state. The torque for
If the torque becomes larger than the torque caused by the paper feed shaft 5, etc., the paper feed shaft 5 will cause rotation.
給紙軸５がつれ回りを起こすと、カム部材５１が若干回
動すると共に、給紙ソレノイド２５の係合川の爪はリン
グ２２から離れないので、給紙装置がスタンバイ状態で
あっても中板９が上昇した状態となって用紙の給紙圧が
加わったままになり、このような状態になると以下に示
すような問題が発生する。When the paper feed shaft 5 twists, the cam member 51 rotates slightly and the engaged claw of the paper feed solenoid 25 does not separate from the ring 22, so even if the paper feed device is in standby mode, the middle plate 9 is in a raised state and the paper feeding pressure remains applied. In such a state, the following problems occur.
（１）中板９が上がったままの状態であるので、用紙を
中板９に積載することができない。さらに、用紙を積載
したつもりであっても、用紙の先端を奥の位置までしっ
かりとセットされていない場合には、第１３図（ａ）に
示すように、給紙ローラ６が回転しても空振りをして給
紙不良の原因となる。(1) Since the middle plate 9 remains up, sheets cannot be stacked on the middle plate 9. Furthermore, even if the paper is intended to be loaded, if the leading edge of the paper is not set firmly all the way to the back, the paper feed roller 6 may rotate as shown in FIG. 13(a). This may cause paper feeding failure.
（２）給紙時のみに必要である給紙圧が、用紙搬送時に
おいても従動ローラ７に常に加わることになって、この
ため第１３図（ｂ）に示すように搬送されていく用紙Ｐ
１からその下側の用紙Ｐ２に引きずり出す向きの摩擦力
Ｆが余分に加わって、重送やつれ重送によるジャム発生
等の原因となる。(2) The paper feeding pressure that is required only when feeding paper is always applied to the driven roller 7 even when transporting the paper, so that the paper P is transported as shown in FIG. 13(b).
An extra frictional force F in the direction of dragging the paper P2 is applied from the paper P2 below the paper P2, causing double feeding or jamming due to double feeding.
また、給紙軸５の前記つれ回りによりカム部材５１がス
タンバイ状態が解除され、かつ給紙ソレノイド２５の係
合用爪が、給紙クラッチＢから離れてしまうほどの大き
な摩擦抵抗トルクが給紙軸５に加わった場合には、上記
の各問題点以上に大きな不具合が発生することになる。Further, the cam member 51 is released from the standby state due to the rotation of the paper feed shaft 5, and a frictional resistance torque large enough to cause the engagement claw of the paper feed solenoid 25 to separate from the paper feed clutch B is generated on the paper feed shaft. If the problem is added to 5, a bigger problem than each of the above problems will occur.
そこで、本発明は、給紙軸に作用する摺動摩擦によるつ
れ回りを防止することにより、つれ回りにより生じる用
紙の重送等を図った給紙装置を提供することを目的とす
るものである。SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a paper feeding device that prevents paper from slipping due to sliding friction acting on a paper feeding shaft, thereby preventing double feeding of sheets caused by slipping.
（二）課題を解決するための手段
本発明は、上述事情に鑑みなされたものであって、例え
ば第１図、第２図を参照して示すと、積載された用紙（
Ｐ）を送出する給紙手段（６）と、この給紙手段（６）
に用紙（Ｐ）の先端を押圧する給紙圧加圧板（９）と、
前記給紙圧加圧板（９）に当接・摺動して前記給紙圧加
圧板（９）を上下動させて前記給紙手段（６）に対する
用紙（Ｐ）の押圧をＯＮ−ＯＦＦするカム部材（１）と
、を有する給紙装置において、前記カム部材（１）と前
記給紙圧加圧板（９〉との摺動部の一部に抵抗手段（１
ａ）を設けたことを特徴とする。(2) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, referring to FIGS. 1 and 2, stacked sheets (
A paper feeding means (6) for sending out P), and this paper feeding means (6)
a paper feeding pressure plate (9) that presses the leading edge of the paper (P);
The sheet feeding pressure pressing plate (9) is brought into contact with and sliding on the sheet feeding pressure pressing plate (9) to move the sheet feeding pressure pressing plate (9) up and down to turn on and off the pressure of the paper (P) against the sheet feeding means (6). A paper feeding device having a cam member (1), a resistance means (1) is provided on a part of the sliding portion between the cam member (1) and the paper feeding pressure plate (9>).
It is characterized by providing a).
（ネ）作用
以上構或に基づき、用紙（Ｐ）を給紙したカム部材（１
〉がｌ回転すると、給紙圧加圧板（９）の当接部（１０
ａ）はカム部材（１）に設けられた突起（１ａ）に対応
し、これを乗り越えるための摺動抵抗が給紙圧加圧板（
９） カム部材（１）に作用して、カム部材（１）は常
に所定のスタンバイ状態の位置に停止する。これにより
、給紙圧加圧板（９）は給紙動作時以外のときには、常
にカム部材（１）により押し下げられた状態に保持され
ていて、用紙（Ｐ）の重送及びジャム等は発生しないよ
うになっている。(f) Function Based on the above structure, the cam member (1) that fed the paper (P)
> rotates l, the contact part (10
a) corresponds to the protrusion (1a) provided on the cam member (1), and the sliding resistance to overcome the protrusion (1a) is the paper feed pressure pressure plate (
9) Acting on the cam member (1), the cam member (1) always stops at a predetermined standby position. As a result, the paper feeding pressure plate (9) is always held in a depressed state by the cam member (1) except during paper feeding operation, and double feeding and jamming of paper (P) do not occur. It looks like this.
なお、上述カツコ内の符号は、図面を参照するために示
すものであって、本発明の構戒を何等限定するものでは
ない。Note that the above-mentioned symbols in brackets are shown for reference to the drawings, and do not limit the structure of the present invention in any way.
（へ）実施例
以下、本発明の実施例を図面を参照して説明する。なお
、第９図〜第１３図に示すものと同しものは、同一符号
で表わしてその説明は省略する。(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Components that are the same as those shown in FIGS. 9 to 13 are denoted by the same reference numerals, and the description thereof will be omitted.
第１図〜第３図において、給紙軸５には、１対のカム部
材１がそれぞれ固着されており、このカム部材１の周面
には第１図に示すように突起１ａ（抵抗手段）が形成さ
れている。このカム部材１が矢印方向に回動することに
より、カム部材１に当接部１０ａが当接して摺動する中
板アーム１ｏ及びこれと一体の中板９は軸１１を中心と
して上下動するようになっている。1 to 3, a pair of cam members 1 are fixed to the paper feed shaft 5, and a projection 1a (resistance means) is formed on the circumferential surface of the cam member 1 as shown in FIG. ) is formed. When the cam member 1 rotates in the direction of the arrow, the middle plate arm 1o, which slides with the contact portion 10a in contact with the cam member 1, and the middle plate 9 integrated therewith move up and down about the shaft 11. It looks like this.
この給紙装置による用紙Ｐの給紙時には、前述した第９
図、第１０図の給紙装置と同様に給紙ソレノイド２５に
給紙信号が入って給紙クラッチＢが作動し、これにより
給紙軸５及びカム部材１、給紙ローラ６（給紙手段）等
が回転を開始する。When feeding paper P by this paper feeding device, the ninth
Similar to the paper feeding device shown in FIGS. ) etc. start rotating.
これらの回転により、中板アーム１ｏ及び中板９が上昇
する向きに回動して用紙Ｐを給紙ローラ６に押圧し、用
紙Ｐを給紙すると共に摩擦分離部材１５により１枚抱け
分離されたのち搬送ローラ１９、従動ローラ７により給
送される。Due to these rotations, the intermediate plate arm 1o and the intermediate plate 9 rotate in the upward direction, press the paper P against the paper feed roller 6, feed the paper P, and separate one sheet by the friction separation member 15. Thereafter, it is fed by the conveyance roller 19 and the driven roller 7.
用紙Ｐの給送を終了したのちのカム部材１は、第１図に
示すスタンバイ状態の元位置に回転してくる。カム部材
１は、用紙Ｐの搬送中あるいは空回転中において、従来
例で説明したような従動ローラ７、給紙ギャ２１による
給紙軸５へのつれ回りトルクが増大して、給紙軸５と共
にカム部材１が回転しようとする．しかし、カム部材１
に摺動する中板アーム１０の当接部１０ａがカム部材１
の突起１ａに対応してきたとき、この突起１ａを当接部
１０ａが乗り越えるにはトルク不足となっていて、カム
部材１は給紙動作時以外にはあ第１図に示すスタンバイ
状態の元位置に常に保持される．
カム部材１は、例えば第３図に示す形状をなしており、
Ｒ３．５の大きさは中板アーム１０の当接部１０ａのＲ
と同等である。カム部材１の突起１ａの効果を試験した
結果を第４図に示す。カム部材の試験は、実機において
突起１ａを設けた場合と、突起１ａを設けてない従来例
形状のものでおのおの行ない、実際の回転速度の４倍速
度の空回転により、換算通紙枚数約４万枚ごとに各トル
クを測定し、やく１６万枚まで行なった。After finishing feeding the paper P, the cam member 1 rotates to its original position in the standby state shown in FIG. When the cam member 1 is conveying the paper P or rotating idly, the trailing torque applied to the paper feed shaft 5 by the driven roller 7 and the paper feed gear 21 increases as described in the conventional example, and the paper feed shaft 5 At the same time, the cam member 1 attempts to rotate. However, cam member 1
The contact portion 10a of the intermediate plate arm 10 that slides on the cam member 1
When the contact portion 10a comes to meet the protrusion 1a, there is insufficient torque for the abutting portion 10a to overcome the protrusion 1a, and the cam member 1 returns to its original position in the standby state shown in Fig. 1 except during sheet feeding operation. is always held. The cam member 1 has a shape shown in FIG. 3, for example,
The size of R3.5 is the R of the contact portion 10a of the intermediate plate arm 10.
is equivalent to The results of testing the effectiveness of the protrusion 1a of the cam member 1 are shown in FIG. Tests were conducted on the cam member in the actual machine with the protrusion 1a and in the conventional shape without the protrusion 1a.The cam member was idly rotated at four times the actual rotation speed, and the equivalent number of sheets passed was approximately 4. Each torque was measured every 10,000 sheets, until 160,000 sheets were printed.
図示のグラフは、横軸に空回転時間から算出した換算通
紙枚数を、縦軸に給紙軸５上でのトルクを示している。In the illustrated graph, the horizontal axis shows the converted number of passed sheets calculated from the idle rotation time, and the vertical axis shows the torque on the paper feeding shaft 5.
図中、符号（ａ）で示すつれ回りトルクは、従動ローラ
７及び給紙ギャ２１の摺動抵抗が給紙軸５を回転させよ
うとするトルクであり、耐久試験を進めるにつれて従動
ローラ７あるいは給紙ギャ２１の給紙軸５との摺動面が
削れたり、あるいは給紙軸５自体の摺動面が削れる等の
理由により増加している。In the figure, the trailing torque indicated by the symbol (a) is the torque caused by the sliding resistance of the driven roller 7 and the paper feed gear 21 to rotate the paper feed shaft 5, and as the durability test progresses, the driven roller 7 or This increase is due to the fact that the sliding surface of the paper feed gear 21 on the paper feed shaft 5 is scratched, or the sliding surface of the paper feed shaft 5 itself is scratched.
図中、カム解除必要トルクとは、第１図の状態から給紙
軸５（同時にカム部材１も）を回転させて、中板アーム
１０をカム部材１から解除（カム部材１の大径部から小
径部に移ること）させて第９図（ｂ）のような状態にす
るのに必要なトルクであり、カム解除必要トルクよりつ
れ回りトルク（ａ）が大きくなったときにカム部材１が
解除されて、第９図（ｂ）の状態となってしまう。つま
り、第４図の（ｂ）のように、カム部材１に突起１ａが
ない場合には、つれ回りトルク（ａ）の増大によりその
差が縮まってマージンは殆どなくなり、カム解除の危゛
険性が非常に高い。In the figure, the required torque for cam release means rotating the paper feed shaft 5 (also the cam member 1 at the same time) from the state shown in Fig. 1 to release the middle plate arm 10 from the cam member 1 (the This torque is necessary to bring the cam member 1 into the state shown in FIG. 9(b) by moving the cam member 1 from This will result in the state shown in FIG. 9(b). In other words, if the cam member 1 does not have the protrusion 1a as shown in FIG. 4(b), the difference will shrink due to an increase in the drag torque (a), and the margin will almost disappear, leading to the danger of the cam being released. Very sensitive.
それに対して、カム部材１に突起１ａを設けた場合には
、第４図（ｃ）のようにつれ回りトルク（ａ）よりもは
るかに大きく耐久を進めた状態でも両者のトルク比は約
２．５倍あり、充分なマージンを持っていることとなっ
て、カム部材１のつれ回りの心配がなく、この突起１ａ
を有するカム部材１のカム形状の効果が証明されている
。On the other hand, when the protrusion 1a is provided on the cam member 1, the torque ratio between the two is about 2.0 mm even when the durability is much greater than the rolling torque (a) as shown in FIG. 4(c). 5 times, and has a sufficient margin, so there is no need to worry about the cam member 1 slipping around, and this protrusion 1a
The effectiveness of the cam shape of the cam member 1 having .
給紙動作時には、カム部材ｌの突起１ａは中板アーム１
０の当接部１０ａを乗り越えなければならないが、給紙
クラッチＢの駆動可能トルクが５Ｋｇｃｍ以上であるの
で、カム部材１の回転は全く問題はない。During paper feeding operation, the protrusion 1a of the cam member l is connected to the intermediate plate arm 1.
However, since the driveable torque of the paper feed clutch B is 5 Kgcm or more, there is no problem in rotating the cam member 1.
なお、ここで述べている給紙軸５と各摺動部について、
摺動抵抗が非常に低いベアリング等を用いれば、前述の
問題は解決されるものであるが、小型・低速機種の給紙
装置においては、ベアリング及びその保持部材等の使用
によるコストアップは受け入れ難いことである。Regarding the paper feed shaft 5 and each sliding part described here,
The above-mentioned problem can be solved by using bearings with extremely low sliding resistance, but the cost increase due to the use of bearings and their holding members is unacceptable for small, low-speed paper feeding devices. That's true.
第５図〜第７図は、カム部材１の変形例を示している。5 to 7 show modified examples of the cam member 1. FIG.
第５図に示すカム部材１は、摺動部に設けられる突起１
ａの代わりにローレット１ｂを設け、かつカム部材１に
摺動する中板アーム１０の中板アーム１０にも同様のロ
ーレットを設けたものである。The cam member 1 shown in FIG. 5 has a projection 1 provided on the sliding part.
A knurl 1b is provided in place of the knurl 1b, and a similar knurl is also provided on the middle plate arm 10 of the middle plate arm 10 that slides on the cam member 1.
また、第６図は、カム部材１の突起１ａの代わりに凹部
１ｃを設けたものである。Further, in FIG. 6, a recess 1c is provided in place of the protrusion 1a of the cam member 1.
さらに、第７図は、カム部材１で示したカム部材１の突
起１ａを２個設けた例を示しており、中板アーム１０の
当接部１０ａが第１の突起１ａを乗り越えても、第２の
突起１ｄで当接部１０ａが停止するようにして、カム部
材１のつれ回りを２重に防止している。なお、この例で
は突起１ａ，１ｄは２個である場合を示したが、その数
は３個又は４個でもよい。Furthermore, FIG. 7 shows an example in which the cam member 1 shown in the cam member 1 is provided with two protrusions 1a, and even if the contact portion 10a of the intermediate plate arm 10 climbs over the first protrusion 1a, The contact portion 10a is stopped by the second protrusion 1d, thereby doubly preventing the cam member 1 from rotating. Although this example shows the case where there are two protrusions 1a and 1d, the number may be three or four.
第８図に示すカム部材■は、周面の摺動面の一部に摩擦
係数の異なる摩擦抵抗部材（摩擦抵抗部材）２を設け、
さらに中板アーム１０の当接部にも摩擦抵抗部材３を設
けたものである。なお、摩擦抵抗部材は、カム部材１の
みに摩擦抵抗部材２を、あるいは中板アーム１０のみに
摩擦抵抗部材３を設けてもよい。The cam member (■) shown in FIG. 8 is provided with a friction resistance member (friction resistance member) 2 having a different coefficient of friction on a part of the sliding surface of the circumference,
Furthermore, a frictional resistance member 3 is also provided at the abutting portion of the intermediate plate arm 10. Note that the frictional resistance member 2 may be provided only on the cam member 1, or the frictional resistance member 3 may be provided only on the intermediate plate arm 10.
（ト）発明の効果
以上説明したように、本発明によれば、用紙（Ｐ）を支
持している中板（９）を上下動させるカム部材（１）に
、突起（１ａ）を設けてカム解除トルクを増大させるこ
とにより、従動ローラ（７）、給紙ギヤ（２１）等によ
る給紙軸（５）のつれ回りを防止し、このつれ回りによ
る用紙（Ｐ）の重送防止、用紙積載の容易性を、簡単な
構成により実現することができる。また、従動ローラ（
７）及び給紙ギヤ（２１）と給紙軸（５）との摺動部に
、摺動抵抗が低゛〈高コストのベアリングを使用するこ
となく、カム部材（１）のつれ回り及びこれによる不具
合を解消することができて、給紙装置のコストダウンを
図ることができる。(g) Effects of the Invention As explained above, according to the present invention, the cam member (1) for vertically moving the middle plate (9) supporting the paper (P) is provided with the protrusion (1a). By increasing the cam release torque, the paper feed shaft (5) is prevented from spinning due to the driven roller (7), the paper feed gear (21), etc., and the paper (P) is prevented from being double fed due to this drift. Ease of loading can be achieved with a simple configuration. In addition, the driven roller (
7) and the sliding part between the paper feed gear (21) and the paper feed shaft (5) has low sliding resistance. Therefore, it is possible to eliminate the problems caused by this, and it is possible to reduce the cost of the paper feeding device.
第１図は本発明の一実施例を示す給紙装置の側面図、第
２図は同じく縦断正面図、第３図は同じくカム部材の具
体的形状を示す正面図、第４図は本発明の実施例による
試験結果のグラフ、第５図〜第７図はカム部材の変形例
を示す正面図、第８図はカム部材及び中板に適用される
摩擦抵抗手段の別の例を示す正面図、第９図（ａ）は従
来の給紙装置の一例を示す側面図、第９図（ｂ）は同じ
く作用図、第１０図は第９図（ａ）の縦断正面図、第１
１図及び第１２図は第９図（ａ）の給紙軸に作用するつ
れ回りトルクの説明図、第１３図は第９図（ａ）の装置
の作用図である。
１・・・カム部材 １ａ，ｌｄ・・・突起２，３・
・・摩擦抵抗部材 ５・・・給紙軸６・・・給紙ロ
ーラ（給紙手段）
７・・・従動ローラ ９・・・中板（給紙圧加圧板
） １０・・・中板アーム １０ａ・・・
中板アームの当接部 Ｐ・・・用紙
Ｂ・・・給紙クラッチ １９・・・搬送ローラ２１
・・・給紙ギヤ
第１図
１
第４図
第
５
図
第７
図
５
第９
図
（ａ）
（ｂ）
第１１
図
Ｔ１
第１０図
Ｂ
第１３図
（ｂ）FIG. 1 is a side view of a paper feeding device showing an embodiment of the present invention, FIG. 2 is a vertical sectional front view, FIG. 3 is a front view showing the specific shape of a cam member, and FIG. 4 is a side view of a paper feeding device according to an embodiment of the present invention. Figures 5 to 7 are front views showing modified examples of the cam member, and Figure 8 is a front view showing another example of the friction resistance means applied to the cam member and the intermediate plate. 9(a) is a side view showing an example of a conventional paper feeding device, FIG. 9(b) is an operational view, and FIG. 10 is a longitudinal sectional front view of FIG. 9(a), and FIG.
1 and 12 are explanatory diagrams of the drag torque acting on the paper feed shaft of FIG. 9(a), and FIG. 13 is an operational diagram of the apparatus of FIG. 9(a). 1...Cam member 1a, ld...Protrusions 2, 3.
...Frictional resistance member 5...Paper feed shaft 6...Paper feed roller (paper feed means) 7...Followed roller 9...Middle plate (paper feed pressure plate) 10...Middle plate arm 10a...
Contact part of middle plate arm P...Paper B...Paper feed clutch 19...Transport roller 21
... Paper feed gear Fig. 1 Fig. 4 Fig. 5 Fig. 7 Fig. 5 Fig. 9 (a) (b) Fig. 11 Fig. T1 Fig. 10 B Fig. 13 (b)
Claims (1)
段に用紙の先端を押圧する給紙圧加圧板と、前記給紙圧
加圧板に当接・摺動して前記給紙圧加圧板を上下動させ
て前記給紙手段に対する用紙の押圧をＯＮ・ＯＦＦする
カム部材と、を有する給紙装置において、 前記カム部材と前記給紙圧加圧板との摺動部の一部に抵
抗手段を設けたことを特徴とする給紙装置。 ２、前記抵抗手段が、前記カム部材に設けられた突起で
あることを特徴とする請求項１記載の給紙装置。 ３、前記抵抗手段が、前記カム部材に設けられた摩擦抵
抗部材であることを特徴とする請求項１記載の給紙装置
。[Scope of Claims] 1. A paper feeding means for sending out stacked papers, a paper feeding pressure plate for pressing the leading edge of the paper against the paper feeding means, and a paper feeding pressure plate that abuts and slides on the paper feeding pressure plate. and a cam member that moves the paper feed pressure plate up and down to turn on and off the pressure of the paper against the paper feed means, wherein the cam member and the paper feed pressure plate are slid together. A paper feeding device characterized in that a resistance means is provided in a part of a moving part. 2. The paper feeding device according to claim 1, wherein the resistance means is a projection provided on the cam member. 3. The paper feeding device according to claim 1, wherein the resistance means is a friction resistance member provided on the cam member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1240428A JP2619959B2 (en) | 1989-09-16 | 1989-09-16 | Paper feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1240428A JP2619959B2 (en) | 1989-09-16 | 1989-09-16 | Paper feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03102019A true JPH03102019A (en) | 1991-04-26 |
| JP2619959B2 JP2619959B2 (en) | 1997-06-11 |
Family
ID=17059341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1240428A Expired - Fee Related JP2619959B2 (en) | 1989-09-16 | 1989-09-16 | Paper feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619959B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5244191A (en) * | 1991-07-08 | 1993-09-14 | Matsushita Electric Industrial Co., Ltd. | Sheet feeding apparatus for image recording system |
| US5707057A (en) * | 1994-11-17 | 1998-01-13 | Riso Kagaku Corporation | Sheet feeding device |
| US6672580B2 (en) * | 2001-09-03 | 2004-01-06 | Matsushita Electric Industrial Co., Ltd. | Sheet feeding apparatus |
| CN100372749C (en) * | 2005-04-15 | 2008-03-05 | 虹光精密工业（苏州）有限公司 | Paper separating mechanism of image I/O equipment |
| US9206002B2 (en) | 2012-04-05 | 2015-12-08 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4258374B2 (en) | 2003-12-26 | 2009-04-30 | 富士ゼロックス株式会社 | Sheet supply apparatus and image forming apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5032667A (en) * | 1973-07-27 | 1975-03-29 | ||
| JPS57102444A (en) * | 1980-12-12 | 1982-06-25 | Canon Inc | Transfer material feeding apparatus |
-
1989
- 1989-09-16 JP JP1240428A patent/JP2619959B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5032667A (en) * | 1973-07-27 | 1975-03-29 | ||
| JPS57102444A (en) * | 1980-12-12 | 1982-06-25 | Canon Inc | Transfer material feeding apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5244191A (en) * | 1991-07-08 | 1993-09-14 | Matsushita Electric Industrial Co., Ltd. | Sheet feeding apparatus for image recording system |
| US5707057A (en) * | 1994-11-17 | 1998-01-13 | Riso Kagaku Corporation | Sheet feeding device |
| US6672580B2 (en) * | 2001-09-03 | 2004-01-06 | Matsushita Electric Industrial Co., Ltd. | Sheet feeding apparatus |
| CN100372749C (en) * | 2005-04-15 | 2008-03-05 | 虹光精密工业（苏州）有限公司 | Paper separating mechanism of image I/O equipment |
| US9206002B2 (en) | 2012-04-05 | 2015-12-08 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2619959B2 (en) | 1997-06-11 |
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