JPS61246080A - Casing for impact-type printer - Google Patents

Abstract

PURPOSE:To reduce noise, by a construction wherein a recording paper passage means with a bent duct construction at least between either of an inserting port and ejecting port for a recording paper and an opening part is so provided that the opening part is communicated to an opening part of a casing. CONSTITUTION:The recording paper passage means 4 comprises a member 14 having a boxlike shape opened on one side and a member 15. The member 14 has a flange 14a extended out ward from one side of an opening edge, the opening edge and the flange 14a being placed on a stepped part 2b provided at the peripheral edge of the opening part 2a of an upper casing 2. The member 15 has a vertical wall 15a and a horizontal wall 15b which are alto gether T-shaped in cross section, the wall 15a serves as a lower part of a vertical wall 14b, so that the inserting port 4a is provided at a lower part of the wall 15a, and the ejecting port 4b is formed by the top face of the wall 15a and the bottom face of the 14b. Accordingly, the part between the ejecting port 4b and the opening part 4c is provided with a perpendicular ly bent duct construction, whereby the opening part 4c is communicated to the opening part 2a of the casing. In addition, a sound-absorbing member 16 such as glass wool, a woven fabric, polyurethane and sponge is adhered to the surfaces of the vertical wall 14b, an upper wall 14c, the vertical wall 15a and the horizontal wall 15b. Accordingly, the sound generated on a platen can be absorbed in the printer casing, thereby reducing noise.

Description

【発明の詳細な説明】 ［技術分野］ 本発明は、インパクト型プリンタのケースに関する。[Detailed description of the invention] [Technical field] The present invention relates to a case for an impact printer.

［背景技術］ プリンタは、印字方式によりインパクト型とノンインパ
クト型に分類される。これらは、それぞれ長所・欠点を
有しているが、昭和５８年度の出荷金額を見るとインパ
クト型が全体の８８％を占めている。（日本電子工業振
興協会調べ）このように現在主流となっているインパク
ト型プリンタの大きな欠点は、インクリボンを介し、活
字を激打したり、印字ワイヤを突出させて、プラテン上
の記録用紙に文字を印字するために騒音が大きいことで
ある。[Background Art] Printers are classified into impact type and non-impact type depending on the printing method. Each of these types has its advantages and disadvantages, but when looking at the amount shipped in 1988, the impact type accounted for 88% of the total. (According to the Japan Electronic Industry Promotion Association) The major drawbacks of the currently mainstream impact printers are that they do not hit the type violently through the ink ribbon, or the printing wire protrudes onto the recording paper on the platen. The problem is that there is a lot of noise when printing characters.

この騒音を低減させるため、特開昭５９−１４６８８０
に開示されているような、プリンタケースを改善したも
のが提案された。このものは、プリンタケースの開口部
に棚板を挿置して記録用紙の印字前後を別けるとともに
、棚板とそれが対向するプリンタケース上面とにそれぞ
れ位置を変えた突起を形成し、これらの間に記録用紙を
摺接させ、音漏れの原因となるケースの開口部を極力小
さくしたものである。これにより相当な騒音低減が可能
になったと思われるが、使用者からは、さらなる騒音低
減を要求されているのである。In order to reduce this noise,
An improved printer case has been proposed, as disclosed in . This device inserts a shelf board into the opening of the printer case to separate the front and back of the recording paper for printing, and also forms protrusions at different positions on the shelf board and the top surface of the printer case where it faces. The recording paper is placed in sliding contact between the two, and the opening of the case, which can cause sound leakage, is made as small as possible. Although this seems to have enabled considerable noise reduction, users are demanding further noise reduction.

［発明の目的］ 本発明は、上記事由に鑑みてなしたものであって、その
目的とするところは、プラテン上で発生する音をプリン
タケース内で吸収してインパクト型プリンタの騒音を低
減させ得るケースの提供にある。[Object of the Invention] The present invention has been made in view of the above reasons, and its purpose is to reduce the noise of an impact printer by absorbing the sound generated on the platen within the printer case. It's about providing a case where you can get it.

［発明の開示］ 本発明に係るインパクト型プリンタのケースは、印字前
の記録用紙の挿入口及び印字後の記録用紙の吐出口と、
印字前後の記録用紙が挿通する開口部とを有し、該挿入
口及び吐出口の少なくともいずれかから該開口部の間が
曲がりダクト構造となった記録用紙通路手段を、該開口
部とケース開口部とが連通ずるよう配設したことを特徴
とする（実施例） 以下本発明の一実施例を第１図乃至第４図に基づいて説
明する。[Disclosure of the Invention] The case of the impact printer according to the present invention includes an insertion port for recording paper before printing, an ejection port for recording paper after printing,
A recording paper passage means having an opening through which the recording paper before and after printing is inserted, and having a curved duct structure between the opening and at least one of the insertion port and the discharge port, is connected to the opening and the case opening. (Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

プリンタケース１は、上ケース２と下ケース３と記録用
紙通路手段４により構成され、ケース１内には、挿入さ
れた記録用紙５を印字しかつ印字後は吐出するためにこ
れを移動させる印字機構６が収容される。この印字機構
６は、側板７に固着されたガイド軸８に移動自在に装着
された印字ヘッド９、インクリボン１０を介在させて印
字ヘッド９に対向するプラテン１１、ガイドローラ１２
．１３等よりなる。プラテン１１ガイドローラ１２．１
３は、図外の駆動手段により所定の速度、所定のピッチ
で回動する。１４は側板７に固着されたガイドで、ケー
ス１内に挿入された記録用紙５をその通路１４ａに通し
てプラテン１１に案内する。またケース１の上面、すな
わち上ケース２には、記録用紙５を挿入、吐出させるケ
ース開口部２ａを有する。The printer case 1 is composed of an upper case 2, a lower case 3, and a recording paper passage means 4. Inside the case 1, there is a printing device that prints on the inserted recording paper 5 and moves it for ejection after printing. A mechanism 6 is housed. The printing mechanism 6 includes a print head 9 movably mounted on a guide shaft 8 fixed to a side plate 7, a platen 11 facing the print head 9 with an ink ribbon 10 interposed therebetween, and a guide roller 12.
．． It consists of 13 mag. Platen 11 guide roller 12.1
3 is rotated at a predetermined speed and a predetermined pitch by a driving means (not shown). A guide 14 is fixed to the side plate 7, and guides the recording paper 5 inserted into the case 1 to the platen 11 through its passage 14a. Further, the upper surface of the case 1, that is, the upper case 2, has a case opening 2a through which the recording paper 5 is inserted and ejected.

記録用紙通路手段４は、印字前の記録用紙５の挿入口４
ａ及び印字後の記録用紙の吐出口４ｂと、印字前後の記
録用紙が挿通する開口部４ｃとを有し、挿入口４ａ及び
吐出口４ｂの少なくともいずれかから開口部４Ｃの間が
曲がりダクト構造となっている。具体的には、外観的に
一面開口の箱状をなす第１部材１４と第２部材１５から
なる。The recording paper passage means 4 is an insertion slot 4 for recording paper 5 before printing.
a, an ejection port 4b for recording paper after printing, and an opening 4c through which the recording paper before and after printing is inserted, and a curved duct structure between at least one of the insertion port 4a and the ejection port 4b and the opening 4C. It becomes. Specifically, it consists of a first member 14 and a second member 15, each of which has a box-like appearance with an opening on one side.

第１部材１４は、開口縁の一面から外方に鍔１４ａを延
設し、開口縁と鍔１４ａが上ケース２の開口部２ａ周縁
の段部２ｂに載置される。第２部材１５は、縦壁１５ａ
と横壁１５ｂにて断面Ｔ形をなし、縦壁１５ａが第１部
材１４の縦壁１４ｂの下方を兼ね、従って挿入口４ａが
縦壁１５ａ下部に設けられ、吐出口４ｂが縦壁１５ａ上
端面と第１部材１４の縦壁１４ｂ下端面とで形成される
。The first member 14 has a flange 14a extending outward from one side of the opening edge, and the opening edge and the flange 14a are placed on a step 2b at the periphery of the opening 2a of the upper case 2. The second member 15 has a vertical wall 15a
The horizontal wall 15b has a T-shaped cross section, the vertical wall 15a also serves as the lower part of the vertical wall 14b of the first member 14, the insertion port 4a is provided at the bottom of the vertical wall 15a, and the discharge port 4b is located at the upper end surface of the vertical wall 15a. and the lower end surface of the vertical wall 14b of the first member 14.

これにより、吐出口４ｂと開口部４ｃの間が直角曲がり
ダクト構造となり、開口部４ｃとケース開口部２ａとが
連通ずる。また、ダクト構造を形成する第１部材１４の
縦壁１４ｂ、上壁１４ｃ、第２部材１５の縦壁１５ａ、
横壁１５ｂの表面に、グラスウール、織物、ウレタン、
スポンジ等の吸音部材１６を張り付けることが望ましい
。Thereby, a right-angled duct structure is formed between the discharge port 4b and the opening 4c, and the opening 4c and the case opening 2a communicate with each other. Further, the vertical wall 14b and upper wall 14c of the first member 14 forming the duct structure, the vertical wall 15a of the second member 15,
On the surface of the side wall 15b, glass wool, textile, urethane,
It is desirable to attach a sound absorbing member 16 such as a sponge.

このケース１では、記録用紙５の着膜は記録用紙通路手
段４、すなわち第１部材１４と第２部材１５を取り外し
て行う。なお、第１部材１４の鍔端部を軸支して回動可
能にしてもよい。In this case 1, film deposition on the recording paper 5 is performed by removing the recording paper passage means 4, that is, the first member 14 and the second member 15. Note that the collar end portion of the first member 14 may be pivoted to be rotatable.

かかるケース１にあっては、印字機構６、つまりプラテ
ンｌｌ上で発生した音が、曲がりダクト構造となった記
録用紙通路手段４内において十分吸収・減衰されるので
、プリンタ全体の騒音が極めて小さくなる。すなわち、
曲がりダクト構造では、音の流れに着目すると、ダクト
の内側と外側でその行路差を生じ、これが位相差となっ
て互いに打ち消しあうためである。In case 1, the noise generated on the printing mechanism 6, that is, the platen 11, is sufficiently absorbed and attenuated within the recording paper passage means 4, which has a curved duct structure, so that the noise of the entire printer is extremely small. Become. That is,
In a curved duct structure, when focusing on the flow of sound, there is a path difference between the inside and outside of the duct, which becomes a phase difference and cancels each other out.

令弟３図のような模型の直角曲がりダクトで、音の減衰
量をみてみると、第４図の結果が得られる。第３図にお
いてＤはダクト寸法である。If we look at the amount of sound attenuation in a model with a right angle bend as shown in Figure 3, we will get the results shown in Figure 4. In FIG. 3, D is the duct dimension.

また、吸音部材１６による減衰効果は次式で得られる。Further, the damping effect by the sound absorbing member 16 can be obtained by the following equation.

Ｒ＝１．０４α　Ｐ／Ｓ　［ｄＢ／ｍ］Ｒ；減衰量 α；材料で決まる吸音率 Ｐ；ダクト断面の周長［ｍ］ Ｓ；ダクト断面積［ｍ２］ 従って、曲がりダクト構造でかつ吸音部材を張り付けれ
ば、音の減衰量はより大きくなる。R=1.04α P/S [dB/m] R; Attenuation α; Sound absorption coefficient determined by material P; Circumferential length of duct cross section [m] S; Duct cross-sectional area [m2] Therefore, the curved duct structure and sound absorption If the members are attached, the amount of sound attenuation will be greater.

なお、実施例では記録用紙通路手段４は、直角面がりダ
クト構造の一段のものを説明したが、これを多段にして
もよく、適宜設計変更が可能である。In the embodiment, the recording paper passage means 4 is described as having a one-stage structure with a right-angled duct structure, but it may have multiple stages, and the design can be changed as appropriate.

［発明の効果］ 本発明のインパクト型プリンタのケースは、上記した如
く構成したものであるから、プラテン上で発生する音を
プリンタケース内で吸収し、もってインパクト型プリン
タの騒音を低減させ得る効果を奏する。[Effects of the Invention] Since the impact printer case of the present invention is configured as described above, it has the effect of absorbing the sound generated on the platen within the printer case, thereby reducing the noise of the impact printer. play.

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

第１図乃至第４図は、本発明の一実施例を示すもので、 第１図は、断面図、 第２図は、一部を切り欠いた斜視図、 第３図は、ダクト構造模型の斜視図、 第４図は、その音の減衰量を示す特性図。 １−ケース、２−上ケース、３−下ケース、４−・記録
用紙通路手段、５−記録用紙、６−印字機構、１４　記
録用紙通路手段の第１部材、１５　関しく第２部材、Ｉ
６−吸音部材。 特許出願人　　松下電工株式会社 代理人弁理士　　　　竹光　散光 （ほか２名） 第１図 第２図 第３図　　　　　　　　第４図 Ｄ（＃）χｆ（ｔＪｒ）1 to 4 show one embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a duct structure model. FIG. 4 is a characteristic diagram showing the amount of sound attenuation. 1-case, 2-upper case, 3-lower case, 4-recording paper passage means, 5-recording paper, 6-printing mechanism, 14 first member of recording paper passage means, 15 related second member, I
6-Sound absorbing member. Patent Applicant Matsushita Electric Works Co., Ltd. Representative Patent Attorney Sanko Takemitsu (and 2 others) Figure 1 Figure 2 Figure 3 Figure 4 D (#) χf (tJr)

Claims (1)

【特許請求の範囲】[Claims] （１）記録用紙を挿入、吐出させるケース開口部を上面
に有し、挿入された記録用紙を印字しかつ印字後は吐出
するために移動させる印字機構を収容したインパクト型
プリンタのケースにおいて、印字前の記録用紙の挿入口
及び印字後の記録用紙の吐出口と、印字前後の記録用紙
が挿通する開口部とを有し、該挿入口及び吐出口の少な
くともいずれかから該開口部の間が曲がりダクト構造と
なった記録用紙通路手段を、該開口部と前記ケース開口
部とが連通するよう配設したことを特徴とするインパク
ト型プリンタのケース。(1) In the case of an impact printer, which has a case opening on the top surface for inserting and ejecting recording paper, and houses a printing mechanism that moves the inserted recording paper to print and eject it after printing. It has an insertion opening for the previous recording paper, an ejection opening for the recording paper after printing, and an opening through which the recording paper before and after printing is inserted, and there is a gap between the opening and at least one of the insertion opening and the ejection opening. A case for an impact type printer, characterized in that a recording paper passage means having a curved duct structure is arranged so that the opening and the case opening communicate with each other.