JPH068579A - Printer - Google Patents

Abstract

PURPOSE:To reduce the noise emitted to the outside from the paper feed port or paper discharge port of a printer. CONSTITUTION:Ductlike space 18 is provided in the vicinity of the paper discharge port of a printer and the resonance cavity 16 having the communication part 15 opened in opposed relation to printing paper is provided. Since the noise passing through a paper discharge route is reduced by the attenuation due to the ductlike space 18 and the resonance frequency due to the resonance cavity 16, the printer low in noise and free from rasping noise due to specific frequency can be provided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明はプリンタに関するもので
あり、更に詳しくは給紙口または排紙口の近傍に配置さ
れる騒音低減装置を改良したプリンタに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, and more particularly to a printer having an improved noise reduction device arranged near a paper feed port or a paper discharge port.

【０００２】[0002]

【従来の技術】従来プリンタが印字機構部により印字を
行うとき騒音が発生し、プリンタのケースを透過する騒
音と、印字用紙の給排紙口である開口部から外部に漏れ
る騒音とによりプリンタの騒音を大きくしていた。この
対策として、特公昭４９−７４５０号公報に開示された
消音装置が知られている。そこで開示されている内容は
図５に示すように、給紙口９および排紙口１０の間に間
挿される消音器を設け、多数の穴２７の明いた２枚の穴
空き金属板２０、２１で外壁を構成し、内部に４枚のポ
リウレタン発砲材２２、２３、２４、２５により空間２
６を設け穴空き金属板２０、２１から消音装置内部に入
射した騒音に対し空間２６を音響フィルタとして作用さ
せ、さらに内部のポリウレタン発泡材２２、２３、２
４、２５による吸音により騒音を低減させるものであっ
た。なお符号４はプラテンを示す。2. Description of the Related Art Conventionally, when a printer prints with a printing mechanism, noise is generated, the noise passing through the case of the printer, and the noise leaking to the outside from an opening that is a sheet feeding / exhausting port for printing paper. The noise was loud. As a countermeasure against this, a silencer disclosed in Japanese Patent Publication No. Sho 49-7450 is known. The content disclosed therein is, as shown in FIG. 5, provided with a silencer inserted between the paper feed port 9 and the paper discharge port 10, and provided with two perforated metal plates 20 having a large number of holes 27. The outer wall is composed of 21, and the space 2 is made up of four polyurethane foam materials 22, 23, 24, 25 inside.
6 is provided to cause the space 26 to act as an acoustic filter for the noise that has entered the silencer from the perforated metal plates 20 and 21, and further the polyurethane foam materials 22, 23, 2 inside.
The noise was reduced by the sound absorption by Nos. 4 and 25. Reference numeral 4 indicates a platen.

【０００３】[0003]

【発明が解決しようとする課題】ところが、このような
構成では、消音器が給排紙口の間に配置されているため
外部に放射する騒音の主な経路となる図５矢印Ｅから印
字用紙７に沿った騒音に対して消音効果がなく、十分な
騒音低減ができないという問題点があった。However, in such a structure, since the muffler is arranged between the paper supply / discharge ports, the main path of noise radiated to the outside is shown in FIG. There is a problem in that there is no silencing effect for the noise in line 7 and the noise cannot be sufficiently reduced.

【０００４】また、内部の空間２６を吸音材により構成
しているので、消音の減衰の周波数特性がなだらかにな
り騒音のピークの周波数を充分に減衰することが困難で
あった。Further, since the internal space 26 is made of a sound absorbing material, the frequency characteristic of attenuation of the muffling becomes gentle, and it is difficult to sufficiently attenuate the peak frequency of the noise.

【０００５】そこで本発明は、従来のこのような問題点
を解決し低騒音でかつ特定の周波数による耳ざわりな騒
音のないプリンタを提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a printer which is low in noise and free of harsh noise due to a specific frequency.

【０００６】[0006]

【課題を解決するための手段】本発明のプリンタは、印
字ヘッドとプラテンとを持つ印字機構部と、印字機構部
を覆うケース部材を有し、ケース部材には印字用紙を印
字機構部へ給紙する給紙口と印字機構部から排紙する排
紙口とを備えたプリンタにおいて、印字機構部と排紙口
との間の紙経路中もしくは給紙口または排紙口外部の近
傍にダクト構造の通紙経路を持ち、ダクト構造の通紙経
路中に印字用紙に対向して開口した連通部を持つ空洞を
構成したことを特徴とする。A printer according to the present invention comprises a printing mechanism section having a print head and a platen, and a case member for covering the printing mechanism section. The case member supplies printing paper to the printing mechanism section. In a printer having a paper feed port for paper and a paper ejection port for ejecting paper from the printing mechanism unit, a duct is provided in the paper path between the printing mechanism unit and the paper ejection port, or in the vicinity of the paper feeding port or the outside of the paper ejection port. It is characterized in that it has a paper passage having a structure, and has a cavity having a communication portion opened in the paper passage having a duct structure so as to face the printing paper.

【０００７】本発明のプリンタは、印字ヘッドとプラテ
ンとを持つ印字機構部と、印字機構部を覆うケース部材
とを有し、ケース部材には印字用紙を前記印字機構部へ
給紙する給紙口と前記印字機構部から排紙する排紙口と
を備えたプリンタにおいて、印字機構部と前記排紙口と
の間の紙経路中もしくは給紙口または排紙口外部の近傍
の少なくとも１箇所にダクト構造の通紙経路を持ちダク
ト構造の通紙経路中に印字用紙に対向して開口した連通
部を持つ空洞を構成したことを特徴とする。A printer according to the present invention has a printing mechanism section having a print head and a platen, and a case member for covering the printing mechanism section. The case member feeds printing paper to the printing mechanism section. In a printer having a mouth and a paper ejection port for ejecting paper from the printing mechanism unit, at least one location in a paper path between the printing mechanism unit and the paper ejection port or in the vicinity of the paper feeding port or the outside of the paper ejection port. It is characterized in that it has a duct-shaped paper passage path and has a cavity having a communication part opened in the paper passage path of the duct structure so as to face the printing paper.

【０００８】[0008]

【実施例】以下に本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.

【０００９】図１は、本発明の実施例のプリンタを示す
断面図で図４におけるＡ−Ａ断面を示すものであり、図
２はこのプリンタの図１における断面Ｂ−Ｂの部分拡大
図、図３はこのプリンタの図２におけるＣから見た要部
の部分拡大図、図４は本発明のプリンタの斜視図であ
る。なお、符号５は紙押えローラー、符号１４はヒンジ
を示す。FIG. 1 is a sectional view showing a printer according to an embodiment of the present invention, which is a sectional view taken along line AA in FIG. 4, and FIG. 2 is a partially enlarged view of a section BB in FIG. FIG. 3 is a partially enlarged view of the main part of this printer seen from C in FIG. 2, and FIG. 4 is a perspective view of the printer of the present invention. Reference numeral 5 indicates a paper pressing roller, and reference numeral 14 indicates a hinge.

【００１０】プリンタのケース部材１には第１のカバー
２が取り付けられ、第１のカバー２にはヒンジ１４によ
り第２のカバー１２が取り付けてある。印字用紙７はプ
リンタのケース部材１に設けられた給紙口９から給紙さ
れプラテン４に巻き付けられ、紙押えローラー５により
プラテン４に押え付けられる。印字ヘッド３により印字
（数字、文字等の他、ドットによるグラフ等の印刷も総
称した概念である）が行われた印字用紙７は、紙案内リ
ブ１１によりプラテンカバー６との間を案内されて、さ
らに紙案内リブ１１の延長上にある共鳴空洞部材１７に
設けた紙案内リブ１３と、印字用紙ガイド部材８の間を
通過し排紙口１０より排紙される。なお、印字用紙ガイ
ド部材８には印字用紙７の滑りを良くするためリブ１９
が設けてある。A first cover 2 is attached to the case member 1 of the printer, and a second cover 12 is attached to the first cover 2 by a hinge 14. The printing paper 7 is fed from a paper feed port 9 provided in the case member 1 of the printer and wound around the platen 4, and is pressed onto the platen 4 by the paper pressing roller 5. The printing paper 7 on which printing is performed by the print head 3 (the concept of printing graphs by dots in addition to numbers, letters, etc. is a general term) is guided between the platen cover 6 and the paper guide ribs 11. Further, the paper passes through between the paper guide rib 13 provided on the resonance cavity member 17 which is an extension of the paper guide rib 11 and the print paper guide member 8 and is discharged from the paper discharge port 10. A rib 19 is provided on the printing paper guide member 8 in order to improve the sliding of the printing paper 7.
Is provided.

【００１１】第２のカバー１２には、共鳴空洞部材１７
を共鳴空洞１６の断面よりも径の小さい連通部１５が印
字用紙７の面に対向して開口するように取り付けてあ
る。前記共鳴空洞部材１７および印字用紙ガイド部材８
とにより、ダクト状空間１８が形成される。The resonance cavity member 17 is provided on the second cover 12.
Is attached so that the communicating portion 15 having a diameter smaller than the cross section of the resonance cavity 16 faces the surface of the printing paper 7 and opens. The resonance cavity member 17 and the printing paper guide member 8
A duct-shaped space 18 is formed by and.

【００１２】プリンタ内部で発生する騒音は主に図１矢
印Ｄの経路で印字用紙７に添って排紙口１０から放射す
る。前記騒音の一部は、前記ダクト状空間１８によって
減衰される。さらに連通部１５を通して共鳴空洞１６に
おいて、連通部１５の径と長さおよび共鳴空洞の体積に
より決まる周波数において共鳴する。（共鳴は一般にヘ
ルムホルツの共鳴と呼ばれている）共鳴空洞の体積が小
さいほど、また連通部の直径が小さいほど共鳴周波数が
高くなる特性があるので、高い周波数ほど共鳴器を小型
に作ることができる。ダクト状空間１８を通過する騒音
は、前記共鳴の損失により前記共鳴周波数において著し
い減衰をする。The noise generated inside the printer is mainly radiated from the paper discharge port 10 along the print paper 7 along the path indicated by the arrow D in FIG. A part of the noise is attenuated by the duct-shaped space 18. Further, through the communication portion 15, the resonance cavity 16 resonates at a frequency determined by the diameter and length of the communication portion 15 and the volume of the resonance cavity. (Resonance is generally called Helmholtz resonance.) The smaller the volume of the resonance cavity and the smaller the diameter of the communication section, the higher the resonance frequency. Therefore, the higher the frequency, the smaller the resonator can be made. it can. Noise passing through the ducted space 18 is significantly attenuated at the resonance frequency due to the loss of the resonance.

【００１３】この実施例によれば、図３において５種類
直径を変えた連通部１５ａ、１５ｂ、１５ｃ、１５ｄ、
１５ｅおよび、共鳴空洞１６ａ、１６ｂ、１６ｃ、１６
ｄ、１６ｅを設けたもので、印字による発生騒音のピー
クの周波数に前記共鳴周波数を合わせたものである。こ
れにより騒音の広い範囲にわたる周波数は前記ダクト状
空間１８により減衰させ、印字による発生騒音のピーク
の周波数は共鳴により減衰させることができる。According to this embodiment, there are five kinds of communicating portions 15a, 15b, 15c, 15d having different diameters in FIG.
15e and the resonance cavities 16a, 16b, 16c, 16
d and 16e are provided, and the resonance frequency is matched with the peak frequency of noise generated by printing. As a result, the frequency of noise over a wide range can be attenuated by the duct-shaped space 18, and the peak frequency of noise generated by printing can be attenuated by resonance.

【００１４】なお、本実施例では連通部１５および共鳴
空洞１６を５種類設けたが、印字による発生騒音のピー
クの周波数は、高調波が数多く発生するので、さらに連
通部１５および共鳴空洞の種類を増やしてもよく、この
場合周波数が高いのでカバー１２および共鳴空洞部材１
７を大型化せずに設けることができる。In this embodiment, five types of the communication portion 15 and the resonance cavity 16 are provided. However, since many harmonics are generated at the peak frequency of noise generated by printing, the types of the communication portion 15 and the resonance cavity are further increased. May be increased. In this case, since the frequency is high, the cover 12 and the resonance cavity member 1 are
7 can be provided without increasing the size.

【００１５】また、本実施例では排紙口１０側に共鳴空
洞部材１７を設けたが、給紙口９側に設けても、給紙口
９から漏れる騒音を低減させることができる。Further, in the present embodiment, the resonance cavity member 17 is provided on the paper discharge port 10 side, but the noise leaking from the paper feed port 9 can be reduced even if it is provided on the paper feed port 9 side.

【００１６】[0016]

【発明の効果】以上説明したように本発明のプリンタに
おいては、プリンタの給紙口や排紙口から外部に放射す
る騒音を減衰させ、印字による発生騒音のピークの周波
数成分毎に減音させることができるため騒音全体を効果
的に減音でき、低騒音でかつ特定の周波数による耳ざわ
りな騒音のないプリンタを提供することができるという
効果がある。As described above, in the printer of the present invention, the noise radiated to the outside from the paper feed port and the paper discharge port of the printer is attenuated, and the noise is reduced for each frequency component of the peak of the noise generated by printing. Therefore, there is an effect that it is possible to effectively reduce the entire noise, and to provide a printer that is low in noise and has no harsh noise due to a specific frequency.

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

【図１】本発明の実施例を示すプリンタの断面図で図４
におけるＡ−Ａ断面を示す図。FIG. 1 is a sectional view of a printer showing an embodiment of the present invention.
The figure which shows the AA cross section in FIG.

【図２】本発明の実施例を示すプリンタの説明図で図１
における断面Ｂ−Ｂの部分拡大図。FIG. 2 is an explanatory view of a printer showing an embodiment of the present invention, and FIG.
6 is a partially enlarged view of a cross section BB in FIG.

【図３】本発明の実施例を示すプリンタの説明図で図２
におけるＣから見た要部の部分拡大図。FIG. 3 is an explanatory view of a printer showing an embodiment of the present invention.
The elements on larger scale which were seen from C in FIG.

【図４】本発明の実施例を示すプリンタの斜視図。FIG. 4 is a perspective view of a printer showing an embodiment of the present invention.

【図５】従来の騒音低減装置の説明。FIG. 5 illustrates a conventional noise reduction device.

【符号の説明】[Explanation of symbols]

１ ケース部材 ２ 第１のカバー ３ 印字ヘッド ４ プラテン ５ 紙押えローラー ６ プラテンカバー ７ 印字用紙 ８ 印字用紙ガイド部材 ９ 給紙口 １０ 排紙口 １１ 紙案内リブ １２ 第２のカバー １３ 紙案内リブ １４ ヒンジ １５ 連通部 １５ａ 連通部 １５ｂ 連通部 １５ｃ 連通部 １５ｄ 連通部 １５ｅ 連通部 １６ 共鳴空洞 １６ａ 共鳴空洞 １６ｂ 共鳴空洞 １６ｃ 共鳴空洞 １６ｄ 共鳴空洞 １６ｅ 共鳴空洞 １７ 共鳴空洞部材 １８ ダクト状空間 １９ リブ ２０ 穴明き金属板 ２１ 穴明き金属板 ２２ 発泡材 ２３ 発泡材 ２４ 発泡材 ２５ 発泡材 ２６ 空間 ２７ 穴 1 Case Member 2 First Cover 3 Print Head 4 Platen 5 Paper Pressing Roller 6 Platen Cover 7 Printing Paper 8 Printing Paper Guide Member 9 Paper Feed Port 10 Paper Ejection Port 11 Paper Guide Rib 12 Second Cover 13 Paper Guide Rib 14 Hinge 15 Communication part 15a Communication part 15b Communication part 15c Communication part 15d Communication part 15e Communication part 16 Resonance cavity 16a Resonance cavity 16b Resonance cavity 16c Resonance cavity 16d Resonance cavity 16e Resonance cavity 17 Resonance cavity member 18 Ducted space hole 19 Rib 20 Metal plate 21 Perforated metal plate 22 Foam material 23 Foam material 24 Foam material 25 Foam material 26 Space 27 Hole

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 印字ヘッドとプラテンとを持つ印字機構
部と、前記印字機構部を覆うケース部材とを有し、前記
ケース部材には印字用紙を前記印字機構部へ給紙する給
紙口と前記印字機構部から排紙する排紙口とを備えたプ
リンタにおいて、前記印字機構部と前記排紙口との間の
紙経路中もしくは前記給紙口または前記排紙口外部の近
傍の少なくとも１箇所にダクト構造の通紙経路を持ち、
前記ダクト構造の通紙経路中に印字用紙に対向して開口
した連通部を持つ空洞を構成したことを特徴とするプリ
ンタ。1. A printing mechanism unit having a print head and a platen; and a case member for covering the printing mechanism unit, wherein the case member has a paper feed port for feeding printing paper to the printing mechanism unit. In a printer having a paper ejection port for ejecting paper from the printing mechanism unit, at least one in a paper path between the printing mechanism unit and the paper ejection port or in the vicinity of the paper feeding port or the outside of the paper ejection port. It has a duct-type paper passage at the location,
A printer characterized in that a cavity having a communication portion opened facing the printing paper is formed in the paper passage of the duct structure.