JPH02303873A - Thermal printer - Google Patents

Abstract

PURPOSE:To prevent dot-off and damage of a thermal head due to static electricity as well by providing an electricity removal brush in contact with whole width of a sheet in advance of a thermal head on a sheet transfer route. CONSTITUTION:A heat sensitive sheet 3 is interposed between a line thermal head 1 and a platen 2 so as to be conveyed under the frictional feed forces caused by a platen 2 driven by a drive motor 7 through a motor gear 8, idler gear 6 and platen gear 5, and the line thermal head 1. And an electricity removal brush 4 is fixed in advance of the head 1 in the direction of conveyance so as to always contact the sheet 3, and hence static electricity is automatically removed from said sheet, while being conveyed, thereby preventing powder of sheet from getting into a printing section, with the result that dot-off is avoided and further electricity is removed from the sheet 3 having been charged due to the friction between the sheet 3 and a roll sheet supporter 9 to prevent damage of the head 1 because of static electricity. As a result, favorable quality of printed character can be obtained and a thermal printer free from damage due to static electricity can be provided.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は直接ライン型サーマルプリンタにおける紙粉の
ヘッド部への入り込み防止並びに静電気除去を一度に行
なえるサーマルプリンタの構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a thermal printer that can prevent paper powder from entering the head section of a direct line type thermal printer and remove static electricity at the same time.

〔従来の技術〕[Conventional technology]

従来の装置は、実開昭６０−１５４１５０号公報に記載
のように感熱記録紙を自動的にクリーニングするだけの
機構となっていた。Conventional apparatuses have a mechanism that only automatically cleans thermal recording paper, as described in Japanese Utility Model Application No. 60-154150.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術は静電気の点について配慮がされておらず
、静電気によるサーマルヘッド破壊ならびに静電気によ
り感熱紙に付着している紙粉のクリーニングができず印
字部へ入り込み、ドツト抜けが発生すると云う問題があ
った。The above-mentioned conventional technology does not take into account static electricity, and there are problems such as damage to the thermal head due to static electricity, and paper dust attached to thermal paper due to static electricity cannot be cleaned and enters the printing area, resulting in missing dots. there were.

本発明は紙粉を除去してドツト抜けを防止することを目
的としており、さらに静電気によるサーマルヘッドの破
壊を防止することを目的とする。The purpose of the present invention is to remove paper dust and prevent dot dropout, and also to prevent damage to the thermal head due to static electricity.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、用紙搬送路のサーマルヘッ
ド手前に、用紙幅全体に接触する除電ブラシを設けて感
熱紙に帯電した静電気を除去できるようにし、用紙に付
着したゴミを取除きゴミによる。In order to achieve the above objective, a static electricity removal brush that contacts the entire width of the paper is installed in front of the thermal head in the paper transport path to remove static electricity charged on the thermal paper. .

〔作　用〕[For production]

除電ブラシの上方を印字面が下向きに通る感熱紙は常に
除電ブラシと接触しており、静電気を除去しながら送ら
れるため、静電気によるサーマルヘッドの破壊を防ぎか
つ、静電気により感熱紙に付着していた紙粉を容易に除
去することができる。Thermal paper passes above the static electricity removal brush with its printing surface facing downward, and is constantly in contact with the static electricity removal brush, removing static electricity as it is fed. This prevents damage to the thermal head due to static electricity, and prevents static electricity from adhering to the thermal paper. Paper dust can be easily removed.

〔実施例〕〔Example〕

以下、本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.

感熱紙３は、ライン型サーマルヘッド１とプラテン２に
挾まれており、駆動モータ７の駆動をモータギヤ８、ア
イドラギヤ９、プラテンギヤ５によって伝達されたプラ
テン２とライン型サーマルヘッド１とのフリクションフ
ィードによって搬送される。The thermal paper 3 is sandwiched between a line-type thermal head 1 and a platen 2, and the drive motor 7 is driven by friction feed between the platen 2 and the line-type thermal head 1, which is transmitted by a motor gear 8, an idler gear 9, and a platen gear 5. transported.

除電ブラシ４はライン型サーマルヘッド１の搬送方向手
前に固定されており、常に感熱紙３と接触していること
により搬送時には自動的に除電されて、紙粉の印字部へ
の進入を防ぎドツト抜けを防止して、さらに感熱紙３と
ロール紙受け９の摩擦により帯電した感熱紙３を除電し
て、静電気によるライン型サーマルヘッド１の破壊を防
止する効果がある。The static elimination brush 4 is fixed in front of the line-type thermal head 1 in the conveying direction, and as it is always in contact with the thermal paper 3, the static electricity is automatically eliminated during conveyance, preventing paper powder from entering the printing area and dot-free. This has the effect of preventing the thermal paper 3 from coming off, and also eliminating static electricity from the charged thermal paper 3 due to friction between the thermal paper 3 and the roll paper receiver 9, thereby preventing destruction of the line type thermal head 1 due to static electricity.

〔発明の効果〕・ 本発明によれば、紙粉等のゴミは常に自動的に除去され
るのでドツト抜けを防止して、良好な印字品質を得る効
果がある。[Effects of the Invention] According to the present invention, dust such as paper dust is always automatically removed, thereby preventing missing dots and achieving good print quality.

また、除電もできるので静電気によるサーマルヘッドの
破壊も防止する効果もある。Furthermore, since static electricity can be removed, it also has the effect of preventing damage to the thermal head due to static electricity.

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

第１図は本発明の一実施例の側面図である。 １・・・ライン型サーマルヘッド、２・・・プラテン、
３・・・感熱紙、４・・・除電ブラシ、５・・・プラテ
ンギヤ、６・・・アイドラギヤ、７・・・駆動モータ、
８・・・モータギヤ、９・・・ロール紙受け。FIG. 1 is a side view of one embodiment of the present invention. 1... Line type thermal head, 2... Platen,
3... Thermal paper, 4... Static elimination brush, 5... Platen gear, 6... Idler gear, 7... Drive motor,
8...Motor gear, 9...Roll paper holder.

Claims (1)

【特許請求の範囲】[Claims] １、ライン型サーマルヘッドとプラテンと感熱紙からな
るライン型サーマルプリンタにおいて、前記ライン型サ
ーマルヘッドの搬送方向手前に用紙幅全体に接触する除
電ブラシを取り付けたことを特徴とするサーマルプリン
タ。1. A line-type thermal printer consisting of a line-type thermal head, a platen, and thermal paper, characterized in that a static elimination brush that contacts the entire paper width is attached to the front of the line-type thermal head in the conveyance direction.