JPH0326170A - Contact type image reader - Google Patents

Abstract

PURPOSE:To carry even an original in which the paper quality and bendability of the original are weak by making the rotating speed of a bristle brush roller one- to two-fold to the rotating speed of an original carrying roller in a facsimile, a copying machine, etc. CONSTITUTION:First, an original 7 is set. When a paper detecting sensor 6 is operated, carrying and driving rollers 3 and 3', carrying follower rollers 4 and 4', a core metal 9 and a bristle brush 8 start the rotations. The original 7 is led in by the carrying driving roller 3 and carrying follower roller 4, the original 7 is brought into close contact on the glass surface of a reader 2 by the bristle brush 8, an image is read, and the original 7 is discharged to a paper discharge tray 5 by the carrying driving and roller 3' and carrying roller 4'. When the bristle brush 8 is rotated at the time of read, since the bristle head rises up by a centrifugal force, a rigidity is remarkably increased in comparison with a still time, and the original 7 can be brought into close contact onto the glass surface of the reader 2. The rotating speed of the bristle brush 8 is made one- to two-fold to the rotating circumferential speed of the carrying driving roller 3. Thus, even when a waved original comes, the fear of the generation of wrinkles can be eliminated by a press contact.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は密着型画像読取装置、詳細には、例えば、ファ
クシミリ、複写機等に用いられる密着型画像読取装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contact type image reading device, and more particularly, to a contact type image reading device used in, for example, facsimiles, copying machines, and the like.

［従来の技術］ この種の装置はさまざまな種類の紙質のものを読取原稿
にしており、紙質の中には腰の弱いもの、腰の強いもの
がある。その紙質の原稿を確実に読取るため、読取装置
上にプラテンローラーを設け読取り原稿を読取装置に圧
接保持するよう構成されている。[Prior Art] This type of device uses various types of paper as documents to be read, and some of the paper types are weak and some are strong. In order to reliably read originals of such paper quality, a platen roller is provided on the reading device to hold the original to be read in pressure contact with the reading device.

［発明が解決しようとしている課題］ しかし、上記従来例では、密着型画像読取り装置の焦点
深度が０．２〜０．３と非常に浅いため、読取り装置上
のプラテンローラーと読取り装置のガラス面は常に圧接
保持された状態に構威しなければならない。密着性を増
すためにプラテンローラー１ｌは軟質の発泡体が使用さ
れており（第２図）、摩擦抵抗が大きく駆動モーターの
負荷トルクが大きいという不利があった。また、プラテ
ンローラーは接触回転しているため、発泡層への紙粉等
の目づまり、摩耗、汚れ等がある。また、読取り原稿の
腰が弱いもの、また波打ちのもの等を搬送するとプラテ
ンローラーに噛えこまれたときにシワが発生し、良好な
原稿読取りができないということがある。[Problems to be Solved by the Invention] However, in the conventional example described above, the depth of focus of the contact type image reading device is very shallow at 0.2 to 0.3, so the platen roller on the reading device and the glass surface of the reading device must be kept in pressure contact at all times. In order to increase adhesion, a soft foam material is used for the platen roller 1l (FIG. 2), which has the disadvantages of large frictional resistance and large load torque of the drive motor. Further, since the platen roller rotates in contact with the roller, the foam layer may become clogged with paper powder, etc., wear out, become dirty, etc. Furthermore, if a document to be read is weak or wavy, it may wrinkle when it gets caught in the platen roller, making it impossible to read the document properly.

［課題を解決するための手段（及び作用）］本発明は密
着型画像読取り装置上のプラテンローラーの構造を、材
質がアクリル，ナイロン，レーヨン等の合成繊維で、繊
維径１．５〜１５デニール（１デニールとは長さ４５０
ｍで重０．０５ｇ）のパイル状に編んだ毛ブラシを芯金
に巻きつけた毛ブラシローラーで構成したものである。[Means for Solving the Problems (and Effects)] The present invention provides a platen roller structure on a contact type image reading device that is made of synthetic fibers such as acrylic, nylon, and rayon, and has a fiber diameter of 1.5 to 15 deniers. (1 denier means length 450
The roller is made up of a bristle brush roller made of pile-knitted bristle brushes (weight: 0.05 g) wrapped around a metal core.

本発明は上述のように構成したもので回転していないと
きは圧接保持力はないが回転すると遠心力により起毛す
るため圧接保持力は増加する。そのため、軟質発泡体よ
りさらに軟質（ソフト）に読取り原稿を圧接するために
摩擦抵抗が小さく、駆動モーターの負荷トルクも小さく
てすむ。読取り原稿の厚み及び腰の強弱及び原稿の状態
（シワ，波打ち）に関係なく搬送できるため高画質の画
像読取りができる。The present invention is configured as described above, and when not rotating, there is no pressure holding force, but when it rotates, the fluff is raised due to centrifugal force, so the pressure holding force increases. Therefore, since it presses against the read document more softly than the soft foam, the frictional resistance is small, and the load torque of the drive motor is also small. High-quality image reading is possible because the document can be conveyed regardless of the thickness of the document to be read, the strength of the body, and the condition of the document (wrinkles, undulations).

［実施例］ 第１図は本発明の特徴を最もよく表す図である。１はフ
ァクシミリ装置、２は読取り装置、３．３′は搬送駆動
ローラー　４，４′は搬送従動ローラー　５は排紙トレ
イ、６は紙検知センサー　７は原稿、８は読取り装置に
圧接保持される毛ブラシローラー　９は毛ブラシを巻き
つける芯金、１０は紙ガイド板である。[Example] FIG. 1 is a diagram that best represents the features of the present invention. 1 is a facsimile device, 2 is a reading device, 3.3' is a transport drive roller, 4 and 4' are transport driven rollers, 5 is a paper output tray, 6 is a paper detection sensor, 7 is a document, and 8 is held in pressure contact with the reading device. Hair brush roller 9 is a core metal around which the bristle brush is wound, and 10 is a paper guide plate.

まず第１図で、原稿７をセットする。紙検知センサー６
が作動すると図示しない駆動モーターが起動し、搬送駆
動ローラー３，３゛と搬送従動ローラー４．４′と芯金
９及び毛ブラシ８が回転を始める。そして、搬送駆動ロ
ーラー３と搬送従勅ローラー４により原稿７を送り込み
、毛ブラシ８で読取り装置２のガラス面に原稿７を密着
させ、画像を読み取り、搬送駆動ローラー３′　と搬送
ローラー４′により原稿７を排紙トレイ５に排紙する。First, in FIG. 1, a document 7 is set. Paper detection sensor 6
When activated, a drive motor (not shown) is activated, and the transport drive rollers 3, 3', transport driven rollers 4, 4', core bar 9, and bristle brush 8 begin to rotate. Then, the document 7 is fed by the conveyance drive roller 3 and the conveyance control roller 4, and the document 7 is brought into close contact with the glass surface of the reading device 2 using the bristle brush 8, and the image is read. The original 7 is ejected to the ejection tray 5.

読取り時において、毛ブラシ８が回転すると遠心力によ
り毛先が立つため、静止時より数段剛性が増し、原稿７
を読取り装置２のガラス面に密着させることができる。During reading, when the bristle brush 8 rotates, the tips of the bristles stand up due to centrifugal force, which increases the rigidity by several steps compared to when it is stationary.
can be brought into close contact with the glass surface of the reading device 2.

従来の軟質発泡体ローラー１ｌの場合であると、読取り
装置２と発泡体ローラー１１の接触量がそのまま装置１
の負荷となりつるため読取り装置２に対するローラー１
１の位置精度は厳しいものが要求され逆に、毛ブラシロ
ーラー８の時は読取り装置２に対し接触量が１〜２ｍｍ
程度変動したとしても、毛ブラシ８の毛足の長さを５ｍ
ｍ〜１０ｍｍ程度に設定しておけば、装置１の負荷とは
なりえず、より大きな接触面積を確保できるので読取り
品質が安定する。また、従来は搬送可能な原稿の厚みは
キャリアシ一ト等を含んだとして０．３ｍｍ程度である
が、本発明によればかなり厚手のものも搬送可能である
。また、波打った原稿７が来た時、第２図の従来のロー
ラーｌ１による搬送では圧接が強いためシワになる恐れ
があるが、本発明の毛ブラシ８であれば問題ない。毛プ
ラシ８の回転速度は搬送駆動ローラー３の回転周速度に
対し１〜２倍とする。これにより、波打った原稿が来て
も、圧接により、シワになる恐れがない。早すぎると原
稿７の裏面をこする毛ブラシ８の摺擦音を発してしまう
。毛プラシ８のブラシ色は背景色を兼ねる必要がある時
は白色が好ましく、原稿７や装置ｌの内に入り込んだゴ
ミやほこりなどは毛ブラシ８の中に埋もれ込んでしまう
ため常に背景色としての白色を維持できる。背景色とし
ない場合は色はこだわらない。毛ブラシ８の線径、線密
度、毛足長等を変えることにより装置にあわせた毛ブラ
シ８を選定できる。In the case of the conventional soft foam roller 1L, the amount of contact between the reading device 2 and the foam roller 11 is the same as that of the device 1.
Roller 1 against reader 2 due to load and strain
1 requires strict positional accuracy, and conversely, when using the bristle brush roller 8, the amount of contact with the reader 2 is 1 to 2 mm.
Even if the degree varies, the length of the bristles of the bristle brush 8 should be set at 5 m.
If it is set to about m to 10 mm, it will not become a load on the device 1, and a larger contact area can be ensured, so that the reading quality will be stabilized. Further, conventionally, the thickness of an original that can be transported is about 0.3 mm including the carrier sheet, but according to the present invention, even a considerably thick original can be transported. Furthermore, when a wavy document 7 arrives, there is a risk that it will wrinkle due to strong pressure when conveyed by the conventional roller l1 shown in FIG. 2, but there is no problem with the bristle brush 8 of the present invention. The rotational speed of the hair brush 8 is set to be 1 to 2 times the rotational peripheral speed of the conveyance drive roller 3. As a result, even if a wavy document arrives, there is no risk of wrinkles due to pressure contact. If it is too early, the bristle brush 8 will make a rubbing sound as it rubs the back side of the document 7. The brush color of the bristle brush 8 is preferably white when it is necessary to also serve as the background color, and since dirt and dust that have entered the document 7 or the device l will be buried in the bristle brush 8, it should always be used as the background color. can maintain its white color. If it is not used as the background color, the color does not matter. By changing the wire diameter, wire density, bristles length, etc. of the bristle brush 8, a bristle brush 8 suitable for the device can be selected.

［発明の効果］ 以上説明したように、読取り装置上のプラテンローラー
を毛ブラシローラーにすることにより原稿の紙質及び腰
の弱い原稿も搬送可能となりいかなる原稿がきても高品
質の画像読取りができる効果がある。また装置自体も簡
単な構成で実現できる効果がある。[Effects of the Invention] As explained above, by using a bristle brush roller as the platen roller on the reading device, it is possible to convey documents with poor paper quality and stiffness, and it is possible to read high-quality images no matter what kind of document is received. be. Furthermore, the device itself has the advantage of being realized with a simple configuration.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の特徴を最もよく表す断面図である。 第２図は従来の読取り部の断面図である。 １はファクシミリ装置 ２は読取り装置 ３．３゜は搬送駆動ローラー ４．４゜は搬送従動ローラー ５は排紙トレイ ６は紙検知センサー ７は原稿 ８ は読取り 装置に圧接保持される毛ブラ シ ローラー ９は芯金 １ ０は紙ガイド板 １ １ は読取り装置に圧接保持される軟質発泡体でできたロー
ラーFIG. 1 is a cross-sectional view that best represents the features of the present invention. FIG. 2 is a sectional view of a conventional reading section. 1 is a facsimile machine 2 is a reading device 3.3° is a transport drive roller 4.4° is a transport driven roller 5 is a paper discharge tray 6 is a paper detection sensor 7 is a document 8 is a bristle brush roller 9 held in pressure contact with the reading device 1 is a core bar 1 0 is a paper guide plate 1 1 is a roller made of soft foam that is held in pressure contact with the reading device

Claims (1)

【特許請求の範囲】 原稿の搬送路上で読取り部と対向する位置に毛ブラシロ
ーラーを圧接保持する密着型画像読取り装置において 原稿搬送ローラーの回転速度に対し上記毛ブラシローラ
ーの回転速度を１〜２倍にしたことを特徴とする密着型
画像読取り装置。[Scope of Claims] In a close-contact image reading device that holds a bristle brush roller in pressure contact with a position facing a reading unit on a document conveyance path, the rotation speed of the bristle brush roller is set to 1 to 2 with respect to the rotation speed of the document conveyance roller. A close-contact image reading device characterized by being doubled.