JPH0324518Y2 - - Google Patents
Info
- Publication number
- JPH0324518Y2 JPH0324518Y2 JP1986105245U JP10524586U JPH0324518Y2 JP H0324518 Y2 JPH0324518 Y2 JP H0324518Y2 JP 1986105245 U JP1986105245 U JP 1986105245U JP 10524586 U JP10524586 U JP 10524586U JP H0324518 Y2 JPH0324518 Y2 JP H0324518Y2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- bottom plate
- paper feed
- cassette
- feeding
- 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.)
- Expired
Links
- 238000000926 separation method Methods 0.000 claims description 24
- 210000000078 claw Anatomy 0.000 description 31
- 238000012840 feeding operation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Sheets, Magazines, And Separation Thereof (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は、自動給送用の給紙カセツトに関し、
より詳細には、用紙の重送(二枚以上の同時給
送)を安定的に防止可能とする分離爪の支持構造
に関するものである。[Detailed description of the invention] [Technical field of the invention] The present invention relates to a paper feeding cassette for automatic feeding.
More specifically, the present invention relates to a support structure for a separating claw that can stably prevent double feeding of sheets (simultaneous feeding of two or more sheets).
従来、電子写真複写機等に用いられる自動給紙
用の給紙カセツトには、用紙の重送を防止する為
に第5図a,bに示される分離爪51,54等が
装着されている。
Conventionally, automatic paper feeding cassettes used in electrophotographic copying machines and the like are equipped with separation claws 51, 54, etc. shown in FIGS. 5a and 5b to prevent double feeding of paper. .
第5図aに示される分離爪51は、カセツト本
体の側壁52aの前端部に上下方向に沿つて形成
されている案内溝53内に、その支持部51aが
摺動自在に遊嵌されている。一方、第5図bに示
される分離爪54は、そのアーム部54aの先端
が側壁55に軸56を介して回動自在に支持され
ている。 The separation claw 51 shown in FIG. 5a has a support portion 51a slidably fitted loosely into a guide groove 53 formed along the vertical direction at the front end of the side wall 52a of the cassette body. . On the other hand, the separating claw 54 shown in FIG. 5b has an arm portion 54a whose tip end is rotatably supported by a side wall 55 via a shaft 56.
上記二種類の分離爪51,54は、給紙に際し
て共に自重により用紙前端隅部を押圧し用紙の重
送を防止する。即ち、給紙開始指示を受け、図示
されていない給紙コロが回転を開始して積載用紙
(スタツク)の上面に当接し、最上紙を接触係合
して給送する。この際にスタツクレベルを下降さ
せるが、分離爪がこの下降に対して、自重により
スタツクレベルに追従移動し、用紙の隅部を保持
して給送移動を抑制し、最上紙とその下の用紙を
分離する。しかし、分離爪をスタツクの上下動に
対し安定的に追従移動させる為には、分離爪の自
重による押圧力だけでは不充分であり、各々、次
の様な不都合が発生し易い。 The two types of separating claws 51 and 54 press the front end corner of the paper by their own weight during paper feeding, thereby preventing double feeding of the paper. That is, upon receiving a paper feed start instruction, a paper feed roller (not shown) starts rotating and comes into contact with the top surface of the stack of sheets (stack) to contact and feed the topmost sheet. At this time, the stack level is lowered, but the separation claw moves to follow the stack level due to its own weight, holds the corners of the paper, suppresses feeding movement, and separates the top paper from the paper below. do. However, in order to move the separation claw stably to follow the vertical movement of the stack, the pressing force due to the separation claw's own weight is insufficient, and the following problems tend to occur.
前者の摺動式分離爪51では、分離爪51自体
の重量が軽いのに加えて水平方向にも遊動する
為、カセツト前面壁52bと用紙前端間に分離爪
51が挟まれ、円滑な追従移動が困難となる。
又、後者の回動式分離爪54においては、長期間
使用する内に紙粉や埃等が軸受部56に溜まり、
やはり円滑な追従移動に支障を来すようになる。 In the former sliding separation claw 51, since the separation claw 51 itself is light in weight and also moves freely in the horizontal direction, the separation claw 51 is sandwiched between the cassette front wall 52b and the front edge of the paper, allowing smooth follow-up movement. becomes difficult.
In addition, in the latter rotary separating claw 54, paper powder, dust, etc. accumulate in the bearing part 56 during long-term use.
After all, it becomes a hindrance to smooth following movement.
又、上記何れの分離爪においても、第6図に示
す如く、分離爪61の下端面61aと底板62間
に用紙が進入して上面61bと最上紙P1間に〓
間が発生し、用紙隅部の押圧保持が不充分となつ
て重送を引き起す。尚、第6図は回動式分離爪6
1を例示したもので、61cはそのアーム部であ
る。 In addition, in any of the separation claws described above, as shown in FIG .
A gap occurs, and the corner of the paper is not sufficiently pressed and held, causing double feeding. In addition, Fig. 6 shows the rotary separation claw 6.
1 is illustrated, and 61c is its arm portion.
本考案は、上記従来技術の問題点に鑑みなされ
たものであつて、用紙の重送を長期に亘り安定的
に防止可能な給紙カセツトを提供することを目的
とする。
The present invention has been devised in view of the problems of the prior art described above, and it is an object of the present invention to provide a paper feed cassette that can stably prevent double feeding of paper over a long period of time.
本考案は、上記目的を達成する為、画像形成機
器の給紙部に着脱自在であり該給紙部に挿着され
て筐体内に積載収納した用紙から最上紙を順次所
定方向に給送する給紙カセツトにおいて、前記筐
体に一端を回動自在に支持されており、少なくと
も用紙の給送方向に対して前端部を積載し底板押
上げ部材の付勢力に基づいて積載用紙を上方に押
し上げる底板と、一端を前記底板の支持部に回動
自在に支承されており他端と前記底板とで積載用
紙の前記隅部を挾持し用紙の重送を防止する用紙
分離部材とを有することを特徴とする。
In order to achieve the above object, the present invention is removably attached to the paper feed unit of an image forming device, and is inserted into the paper feed unit to sequentially feed the top paper from the stacked and stored sheets in a housing in a predetermined direction. In the paper feed cassette, one end is rotatably supported by the housing, at least the front end is loaded in the paper feeding direction, and the loaded paper is pushed upward based on the biasing force of the bottom plate push-up member. The paper separation member includes a bottom plate, and a paper separation member whose one end is rotatably supported by a supporting portion of the bottom plate and which pinches the corner of the stacked paper with the other end and the bottom plate to prevent double feeding of paper. Features.
以下、本考案の実施例について、添付の図面を
参照しながら詳細に説明する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第1図は本考案の一実施例としての給紙カセツ
トCを示す一部破断斜図で、第2図はその装着状
態を示す模式的断面図、第3図はその底板ユニツ
トUを示す斜視図である。 Fig. 1 is a partially cutaway perspective view showing a paper feed cassette C as an embodiment of the present invention, Fig. 2 is a schematic cross-sectional view showing its installed state, and Fig. 3 is a perspective view showing its bottom plate unit U. It is a diagram.
第1図において、カセツト本体1の底部1aに
底板2が回動自在に装着されている。本例では、
第2図に示す如く、カセツト底部1aの略中央部
に段差Gを形成し、その下段面の両側部にスリツ
ト1bが夫々穿設されている。これらスリツト1
bに、底板2の一端の両側部に形成された一対の
係止部2a,2a(第3図参照)を夫々挿入し、
底板2が回動自在に装着されている。底板2の給
紙方向Aに対して前端部は、若干の角度だけ下方
に折曲され、挟持部2bが形成されている。挟持
部2bの両側には摩擦板3,3が敷設されてお
り、これにより、積載用紙の内の最下紙の重送が
防止される。そして、底板2の裏面における略中
央部の両側には、夫々1対づつの支持板2c,2
c及び2d,2dが立設されている。これら各支
持板2c〜2dには、夫々挿持孔4が穿設されて
いる。以上の様な形状の底板2は、内側の2枚の
支持板2c,2dを切り起し加工として板金加工
法により一体に成形することができ、原価低減に
寄与する。 In FIG. 1, a bottom plate 2 is rotatably attached to a bottom portion 1a of a cassette body 1. As shown in FIG. In this example,
As shown in FIG. 2, a step G is formed approximately at the center of the cassette bottom 1a, and slits 1b are formed on both sides of the lower step surface. These slits 1
Insert a pair of locking parts 2a, 2a (see FIG. 3) formed on both sides of one end of the bottom plate 2 into b, respectively.
A bottom plate 2 is rotatably mounted. The front end of the bottom plate 2 with respect to the paper feeding direction A is bent downward by a slight angle to form a holding part 2b. Friction plates 3, 3 are provided on both sides of the holding portion 2b, thereby preventing double feeding of the lowest sheet of the stacked sheets. A pair of support plates 2c and 2 are provided on both sides of the substantially central portion of the back surface of the bottom plate 2.
c, 2d, and 2d are standing upright. Each of these support plates 2c to 2d is provided with a holding hole 4, respectively. The bottom plate 2 having the above shape can be integrally formed by cutting and raising the two inner support plates 2c and 2d using a sheet metal processing method, which contributes to cost reduction.
而して、1対の分離爪5,5が、底板2裏面の
両側部に沿つて回動自在に装着されている。本例
の分離爪5は、一端側にT字形に形成された軸支
部5aと、他端側に略コの字形に折曲された用紙
把持部5bと、これら両者間を一体接続するアー
ム部5cとから構成されている。把持部5bに
は、底板2とで用紙を挟持する挟持部5dが爪形
に形成されると共に、制動突起5eが背板5f側
部から突出形成されている。以上の如く構成され
た各分離爪5が各軸支部5aを底板2の支持板2
c,2c及び2d,2dに夫々回動自在に挿通さ
せて、底板ユニツトUが構成されている。上述の
底板ユニツトUがカセツト本体1の底部1aに回
動自在に装着された状態においては、第1図にも
示す如く、各分離爪5の制動突起5eは本体前面
壁1cの両側に穿設されている角穴6内に遊嵌さ
れている。又、カセツト底部1aの4個の上記支
持板部2c〜2dに対応する位置には、逃げ穴7
が夫々穿設されており、底板2の回動動作を妨げ
る不都合が回避される。更に、本例では、カセツ
ト本体の前面壁1c中央部から底部1aの前端側
の適長に亘り、切り欠き部8が形成されており、
次に述べる底板押上げ部材9が円滑にカセツト本
体1内に侵入できる構成となつている。 A pair of separation claws 5, 5 are rotatably mounted along both sides of the back surface of the bottom plate 2. The separation claw 5 of this example includes a shaft support 5a formed in a T-shape at one end, a paper gripping part 5b bent in a substantially U-shape at the other end, and an arm part integrally connecting these two. 5c. The gripping portion 5b has a claw-shaped gripping portion 5d that grips the paper with the bottom plate 2, and a braking protrusion 5e is formed to protrude from the side of the back plate 5f. Each separation claw 5 configured as described above connects each shaft support 5a to the support plate 2 of the bottom plate 2.
c, 2c and 2d, 2d are respectively rotatably inserted to form a bottom plate unit U. When the above-mentioned bottom plate unit U is rotatably attached to the bottom 1a of the cassette main body 1, as shown in FIG. It is loosely fitted into the square hole 6. In addition, relief holes 7 are provided in the cassette bottom 1a at positions corresponding to the four support plate portions 2c to 2d.
are bored in each case, thereby avoiding the inconvenience of interfering with the rotational movement of the bottom plate 2. Furthermore, in this example, a notch 8 is formed extending from the center of the front wall 1c of the cassette body to the front end side of the bottom 1a for an appropriate length.
The structure is such that a bottom plate push-up member 9, which will be described next, can smoothly enter into the cassette main body 1.
第2図に示す如く、上述の給紙カセツトCが挿
着される画像形成機器の給紙部Fにおいては、段
差を備えた基板10の下段面10a上に、底板押
上げ部材9が回動自在に配設されている。本例の
底板押上げ部材9は、一端を一対のブロツク11
(一方のみが図示されている)間に架設された軸
12を介して回動自在に支承されると共に、他方
の先端に回転自在に支承されたコロ13を具有す
る押上げ板14と、押上げ板14と基板下段面1
0a間に介装され、押上げ板14を上方(時計回
り方向)に回動付勢するコイルバネ15とから構
成されている。斯の様に構成された給紙部Fに対
し、前述した給紙カセツトCを白抜き矢印a方向
に挿入して行くと、斜め上方に支持された押上げ
板14の先端部が切り欠き部8からカセツトC内
に進入し、やがてコロ13が底板2裏面に当接し
回転しつつ上方に底板2を押し上げる。これによ
り、積載用紙の先端部両隅が底板2と分離爪5の
各挟持部2b,5d間に挟持され、給紙の準備が
完了する。 As shown in FIG. 2, in the paper feed section F of the image forming apparatus into which the above-mentioned paper feed cassette C is inserted, the bottom plate push-up member 9 is rotated on the lower surface 10a of the substrate 10 having a step. It is freely arranged. The bottom plate push-up member 9 of this example has one end connected to a pair of blocks 11.
A push-up plate 14 (only one of which is shown) is rotatably supported via a shaft 12 installed therebetween, and has a roller 13 rotatably supported at the other end; Raised plate 14 and lower board surface 1
0a, and a coil spring 15 that biases the push-up plate 14 upward (clockwise). When the paper feed cassette C described above is inserted in the direction of the outlined arrow a into the paper feed section F configured as described above, the tip of the push-up plate 14 supported diagonally upward will come into contact with the notch. 8 into the cassette C, and eventually the rollers 13 come into contact with the back surface of the bottom plate 2 and push the bottom plate 2 upward while rotating. As a result, both corners of the leading edge of the stacked paper are held between the bottom plate 2 and the holding parts 2b and 5d of the separation claw 5, and preparation for paper feeding is completed.
叙上の如く構成されたた給紙カセツトの動作に
ついて、以下に説明する。 The operation of the paper feed cassette constructed as described above will be explained below.
第4図aは給紙動作開始前の給紙部Fの状態を
示す模式的断面図で、用紙スタツクSの前端部が
分離爪5と底板2の各挟持部5b,2d間に挟持
されている。この場合、制動突起5eが角穴6の
上端面に当接し、分離爪5及びスタツクSの最上
紙P1が適正な上限レベルに保持されている。給
紙開始指示と共に、給紙コロ16が矢印B方向に
回転し、第4図bに示す如く、その回転と共にス
タツクSの上面と当接し、押上げ部材9の弾性付
勢力に抗してスタツクSを下方に押し下げる。こ
のスタツクSの下降動作に追従して分離爪5も下
方(反時計回り方向)に回動し、自重による適切
な圧力で用紙両隅を挟持する。この場合、底板2
の下方への回動と一体に分離爪5の軸支部5aが
下降するから、分離爪5の挟持部5dの下降動作
に対して自重以外に有る程度の強制力が作用し、
従来のカセツト本体に装着された分離爪等に比べ
て、追従降下動作が円滑化される。従つて、スタ
ツクSの最上紙P1に対して、給紙コロ16と係
合接触することにより給紙方向Aに沿つた搬送力
が作用するが、両隅が分離爪5により適度な圧力
で押圧されて給送が抑制される為に最上紙P1が
上方に撓み、これにより確実にスタツクSと分離
されて給紙方向Aに送出される。斯くの如くし
て、給紙コロ16の1回転毎にスタツクS前端部
が上下に往復回動し、これに追従して円滑に分離
爪5も上下に往復回動し、用紙が1枚づつ確実に
給送される。又、本考案の分離爪5による場合
は、第6図に示した分離爪の下方に用紙先端が進
入する不都合が発生しないから、用紙の重送がよ
り確実且つ安定的に防止される。 FIG. 4a is a schematic cross-sectional view showing the state of the paper feed section F before the start of paper feeding operation, in which the front end of the paper stack S is held between the separating claw 5 and the holding parts 5b and 2d of the bottom plate 2. There is. In this case, the brake protrusion 5e comes into contact with the upper end surface of the square hole 6, and the separating claw 5 and the uppermost sheet P1 of the stack S are held at the appropriate upper limit level. In response to the instruction to start paper feeding, the paper feeding roller 16 rotates in the direction of arrow B, and as shown in FIG. Push S down. Following this downward movement of the stack S, the separating claws 5 also rotate downward (counterclockwise) and clamp both corners of the paper with appropriate pressure due to its own weight. In this case, the bottom plate 2
Since the shaft support 5a of the separation claw 5 descends together with the downward rotation of the separation claw 5, a certain amount of forcing force other than its own weight acts on the downward movement of the holding portion 5d of the separation claw 5.
The follow-up lowering operation is smoother than the conventional separation claw attached to the cassette body. Therefore, a conveying force along the paper feeding direction A is applied to the topmost paper P 1 of the stack S by engaging and contacting the paper feeding roller 16, but both corners are applied with moderate pressure by the separating claws 5. Since the uppermost paper P1 is pressed and its feeding is suppressed, it bends upward, thereby ensuring that it is separated from the stack S and sent out in the paper feeding direction A. In this manner, the front end of the stack S reciprocates up and down with each rotation of the paper feed roller 16, and the separation claw 5 also smoothly reciprocates up and down following this, and the sheets are separated one by one. will be delivered reliably. Furthermore, in the case of the separating claw 5 of the present invention, the disadvantage that the leading edge of the paper enters below the separating claw shown in FIG. 6 does not occur, so double feeding of paper can be more reliably and stably prevented.
尚、本考案は上記の好適実施例に限定されるべ
きものではなく、本考案の技術的範囲において
種々の変形が可能であることは勿論である。例え
ば、底板押上げ部材はカセツト本体内に配設して
もよい。 It should be noted that the present invention is not limited to the preferred embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, the bottom plate push-up member may be disposed within the cassette body.
以上、詳述した如く、本考案によれば、分離部
材の支持側端部を底板の裏面で回動自在に支承す
ることにより、分離部材を常に円滑に積載用紙上
面に追従移動させることができ、長期に亘り安定
的に用紙の重送を防止することができる。
As described in detail above, according to the present invention, by rotatably supporting the supporting end of the separating member on the back surface of the bottom plate, the separating member can always be smoothly moved to follow the upper surface of the stacked sheets. , it is possible to stably prevent double feeding of paper over a long period of time.
第1図は本考案の一実施例としての給紙カセツ
トCを示した斜視図、第2図は上記給紙カセツト
Cの挿着状態を示した模式的断面図、第3図は上
記給紙カセツトCに装着される底板ユニツトUを
示した斜視図、第4図a,bは夫々給紙動作を示
した各模式的断面図、第5図a,bは従来技術の
分離爪を示した各斜視図、第6図は従来技術の問
題点を示した模式的断面図である。
1……カセツト本体、2……底板、2c,2d
……支持板、5,51,54……分離爪、5a…
…軸支部、5b……挟持部、5e……制動突起、
9……押上げ部材、15……コイルバネ。
FIG. 1 is a perspective view showing a paper feed cassette C as an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing the inserted state of the paper feed cassette C, and FIG. A perspective view showing the bottom plate unit U attached to the cassette C, FIGS. 4a and 4b are schematic sectional views showing the paper feeding operation, and FIGS. 5a and 5b show the separation claws of the prior art. Each perspective view and FIG. 6 are schematic cross-sectional views showing problems of the prior art. 1...Cassette body, 2...Bottom plate, 2c, 2d
...Support plate, 5, 51, 54...Separation claw, 5a...
... shaft support, 5b... clamping part, 5e... braking protrusion,
9... Push-up member, 15... Coil spring.
Claims (1)
紙部Fに挿着されて筐体1内に積載収納した用紙
Sから最上紙P1を順次所定方向Aに給送する給
紙カセツトCにおいて、 前記筐体1に一端2aを回動自在に支持されて
おり、少なくとも用紙の給送方向Aに対して前端
部を積載し底板押上げ部材9の付勢力に基づいて
積載用紙Sを上方に押し上げる底板2と、 一端5aを前記底板2の支持部2c,2dに回
動自在に支承されており、他端5dと前記底板2
とで積載用紙Sの前記隅部を挟持し用紙の重送を
防止する用紙分離部材5とを有することを特徴と
する給紙カセツトC。[Scope of Claim for Utility Model Registration] The uppermost paper P 1 is sequentially inserted in a predetermined direction from the paper S S which is detachably attached to the paper feed unit F of an image forming device and is inserted into the paper feed unit F and stacked and stored in the housing 1. The paper feed cassette C that feeds paper to paper A is rotatably supported at one end 2a by the housing 1, and at least the front end is loaded in the paper feeding direction A, and the bottom plate push-up member 9 is attached to the paper feed cassette C. a bottom plate 2 that pushes up the stacked sheets S based on force; one end 5a is rotatably supported by the support portions 2c, 2d of the bottom plate 2, and the other end 5d and the bottom plate 2
A paper feed cassette C characterized in that it has a paper separation member 5 which pinches the corner of the stacked paper S and prevents double feeding of the paper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986105245U JPH0324518Y2 (en) | 1986-07-09 | 1986-07-09 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986105245U JPH0324518Y2 (en) | 1986-07-09 | 1986-07-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6311444U JPS6311444U (en) | 1988-01-25 |
JPH0324518Y2 true JPH0324518Y2 (en) | 1991-05-28 |
Family
ID=30979491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1986105245U Expired JPH0324518Y2 (en) | 1986-07-09 | 1986-07-09 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0324518Y2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH085166Y2 (en) * | 1988-12-23 | 1996-02-14 | 株式会社リコー | Paper feeder |
JP2008105790A (en) * | 2006-10-24 | 2008-05-08 | Canon Inc | Sheet feeding device and image forming device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5815165U (en) * | 1981-07-24 | 1983-01-29 | 株式会社デンソー | Refrigeration equipment |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60195843U (en) * | 1984-06-08 | 1985-12-27 | 沖電気工業株式会社 | Print media feeding mechanism |
JPS6186334U (en) * | 1984-11-09 | 1986-06-06 |
-
1986
- 1986-07-09 JP JP1986105245U patent/JPH0324518Y2/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5815165U (en) * | 1981-07-24 | 1983-01-29 | 株式会社デンソー | Refrigeration equipment |
Also Published As
Publication number | Publication date |
---|---|
JPS6311444U (en) | 1988-01-25 |
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