JPS60225763A - Head gap temperature corrector for dot printer - Google Patents

Head gap temperature corrector for dot printer

Info

Publication number
JPS60225763A
JPS60225763A JP59083225A JP8322584A JPS60225763A JP S60225763 A JPS60225763 A JP S60225763A JP 59083225 A JP59083225 A JP 59083225A JP 8322584 A JP8322584 A JP 8322584A JP S60225763 A JPS60225763 A JP S60225763A
Authority
JP
Japan
Prior art keywords
pressure receiving
receiving body
linear expansion
support member
platen
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.)
Granted
Application number
JP59083225A
Other languages
Japanese (ja)
Other versions
JPH0254790B2 (en
Inventor
Takashi Kanetaka
兼高　俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Sanyo Electric Co Ltd
Toshiba TEC Corp
Original Assignee
Tokyo Sanyo Electric Co Ltd
Tokyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Sanyo Electric Co Ltd, Tokyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP59083225A priority Critical patent/JPS60225763A/en
Publication of JPS60225763A publication Critical patent/JPS60225763A/en
Publication of JPH0254790B2 publication Critical patent/JPH0254790B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3088—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the printer frame, e.g. for rotation of an eccentric carriage guide shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/377—Cooling or ventilating arrangements

Landscapes

  • Handling Of Sheets (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Impact Printers (AREA)

Abstract

PURPOSE:To enable a head gap to be maintained within a fixed range despite temperature changes by permitting an expanding or shrinking action of a support member due to temperature changes based on reference rims formed on right and left frames. CONSTITUTION:In a platen 2, a cylindrical pressure receiving body 4 made of a synthetic resin is fixed on the circumference of a steel core 3 with a circular cross-section and the thickness thereof 4 is set at A in the dimension. The platen 2 turns to feed paper by one pitch and moves a carrier 9 to perform a printing. As the thickness A of the pressure receiving body 4 of the platen 2 varies due to temperature changes, the dimension A' from the fixed end to the core 3 changes with respect to a reference rim 13 of a support member 11. But the coefficient of linear expansion and the thickness A of the pressure receiving body 4 are set and the coefficient of linear expansion and the dimension A' of the support member 11 also done so that variations in the linear expansion of both the parts can be equal thereby enabling a head gap (s) to be kept constant regardless of temperature changes. This can prevent possible difference in the density of printing and fouling of paper by an ink ribbon.

Description

【発明の詳細な説明】 発明の技術分野 この発明は、ドツトプリンタのヘッドギャップ温度補正
装置に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a head gap temperature correction device for a dot printer.

発明の技術的背景及びその問題点 第６図に示すように、ドツトプリンタヘッド（１）と対
向するプラテン（２）は金属製の芯材（３）の外面に硬
質ゴムあるいは合成樹脂製の受圧体（４）を固定したも
のが多用されている。プラテン（２）によシペーパー（
５）を送る場合は受圧体（４）も芯材（３）も断面が円
形であるがペーパー（５）を他のローラで送るものは円
形とは限らない。いずれにしてもドツトプリンタの場合
にはドツトプリンタヘッド（１）とプラテン（２）との
間のヘッドギャップ四を０．０２−０．０５１ａｍの狭
い範囲に調節しなければならないことは周知である。し
かし、組立時にこの範囲に調節してもゴムや合成樹脂に
よる受圧体（４）は線膨張係数が芯材（３）のそれよ）
も大きいため厚さＡ方向の線膨張変化量が大きくなシ、
ヘッドギャップＳを狭い許容範囲にコントロールするこ
とはできない。たとえば、Ａが１２．７ａｍの場合、５
０℃変化すると人の値は０．０６〜０．０９変化する。Technical background of the invention and its problems As shown in Figure 6, the platen (2) facing the dot printer head (1) has a pressure receiving body made of hard rubber or synthetic resin on the outer surface of a metal core material (3). (4) is often used. Place the paper on the platen (2) (
5) In the case of feeding, both the pressure receiving body (4) and the core material (3) have a circular cross section, but the paper (5) fed by other rollers is not necessarily circular in cross section. In any case, it is well known that in the case of a dot printer, the head gap between the dot printer head (1) and the platen (2) must be adjusted within a narrow range of 0.02-0.051 am. However, even if adjusted within this range during assembly, the linear expansion coefficient of the pressure receiving body (4) made of rubber or synthetic resin is that of the core material (3).
is also large, so the linear expansion change in the thickness A direction is large.
The head gap S cannot be controlled within a narrow tolerance range. For example, if A is 12.7am, 5
When the temperature changes by 0°C, the human value changes by 0.06 to 0.09.

受圧体（４）の厚さＡを小さくすれば線膨張変化量を小
さくすることができるが、外周の弧の半径が小さくなシ
ドットプリンタヘッド（１）の個々のニードルのプラテ
ン（２）に対するギャップにバラツキが生じる。Ｂが大
きければ印字が薄くなり、ｓが小さければペーパー（５
）がインクリボンにこすられて汚れる問題がある。By reducing the thickness A of the pressure receiving body (4), the amount of change in linear expansion can be reduced. There will be variations in the gap. If B is large, the print will be thin, and if s is small, paper (5
) is rubbed against the ink ribbon and becomes dirty.

発明の目的 この発明はこのような点に鑑みなされたもので、温度変
化に拘わらずヘッドギャップを一定の範囲内に維持する
ことができるドツトプリンタのヘッドギャップ温度補正
装置をうろことを目的とする。OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a head gap temperature correction device for a dot printer that can maintain the head gap within a certain range regardless of temperature changes.

発明の概要 この発明は芯材の外面に非金属の受圧体を固定してプラ
テンを形成したものにおいて、芯材の両端を保持する左
右の支持部材を設け、これらの支持部材のドツトプリン
タヘッド側の一端縁を左右のフレームに形成した基準縁
に固定し、この基準縁を基準として支持部材の温度変化
に基づく膨張収縮動作を許容し、同一の温度条件におい
て受圧体の厚さ方向の線膨張変化量と支持部材の線膨張
変化量とを等しくシ、シたがって、組立調整後において
は温度の変化に関係なく常に所望のヘッドギャップを維
持し、印字の濃淡差を防止しペーパーの汚れを防止しう
るように構成したものである。Summary of the Invention This invention has a platen formed by fixing a non-metallic pressure receiving body to the outer surface of a core material, in which left and right support members are provided to hold both ends of the core material, and the dot printer head side of these support members is provided. One end edge is fixed to a reference edge formed on the left and right frames, and the support member is allowed to expand and contract based on temperature changes with this reference edge as a reference, and linear expansion and contraction changes in the thickness direction of the pressure receiving body under the same temperature conditions. Therefore, after assembly and adjustment, the desired head gap is always maintained regardless of temperature changes, preventing differences in printing shading and staining the paper. It is configured so that it can be used.

発明の実施例 この発明の第一の実施例を第１図ないし第３図に基いて
説明する。第６図において説明した部分と同一の部分は
同一符号を用いて説明する。相対向するフレーム（６）
にキャリアシャ７）（７）とガイドシャ；ｙ　）　（８
）とが架設され、ドツトプリンタヘッド（１）を搭載し
たキャリア（９）がこれらのシャフト（７）　（８）に
スライド自在に保持されている。プラテン（２）は鉄鋼
製の断面円形の芯材（３）の外周に合成樹脂製の円筒の
受圧体（４）を固定したもので、受圧体（４）の厚　゛
さはＡ寸法に定められている。Embodiment of the Invention A first embodiment of the invention will be described with reference to FIGS. 1 to 3. The same parts as those explained in FIG. 6 will be explained using the same reference numerals. Opposing frames (6)
The carrier shaft 7) (7) and the guide shaft; y) (8
), and a carrier (9) carrying a dot printer head (1) is slidably held on these shafts (7) and (8). The platen (2) has a cylindrical pressure receiving body (4) made of synthetic resin fixed to the outer periphery of a core material (3) made of steel with a circular cross section, and the thickness of the pressure receiving body (4) is determined as dimension A. It is being

ついで、芯材（３）を回転自在に支承するブツシュａＩ
が取付けられた合成樹脂製の支持部材αυが設けられて
いる。フレーム（６）には角孔ａｚが形成され、角孔ａ
ｚの一辺の基準縁ａ騰に支持部材αυのドツトプリンタ
ヘッド（１）側の一端縁Ｉが接着剤α９等によシ固定さ
れている。支持部材ａυはフレーム（６）に対する接着
面積を大きくするため接着補強片（Ｌ６１を有している
が、フレーム（６）に対する固定端は実質的に一端縁Ｉ
である。角孔α２は支持部材ａυが温度変化によ）膨張
及び収縮するように支持部材ａυよシ大きく形成されて
いる。Next, a bushing aI rotatably supports the core material (3).
A support member αυ made of synthetic resin is provided. A square hole az is formed in the frame (6), and a square hole a
One end edge I of the support member αυ on the dot printer head (1) side is fixed to the raised reference edge a of one side of z by adhesive α9 or the like. The supporting member aυ has an adhesive reinforcing piece (L61) to increase the adhesive area to the frame (6), but the fixed end to the frame (6) is substantially one edge I.
It is. The square hole α2 is formed larger than the support member aυ so that the support member aυ expands and contracts due to temperature changes.

このような構成において、プラテン（２）を回転してペ
ーパーをワンピッチ送シ、キャリア（９）を移動して印
字を行なう。そして、温度変化によシブラテン（２）の
受圧体（４）の厚さＡが変化し、支持部材αυの基準縁
（１３に対する固定端から芯材（３）までの寸法Ａ′も
変化するが、受圧体（４）の線膨張係数をαＲ１支持部
材ａυの線膨張係数をαＣとすると、温度がΔＴ変化し
たときのプラテン（２）とドツトプリンタヘッド（１）
との間のヘッドギャップ心（ΔＴ）の変化は次の式によ
り表わされる。In this configuration, the platen (2) is rotated to feed the paper in one pitch, and the carrier (9) is moved to perform printing. As the temperature changes, the thickness A of the pressure receiving body (4) of the sieving platen (2) changes, and the dimension A' from the fixed end to the reference edge (13) of the support member αυ from the core material (3) also changes. , the linear expansion coefficient of the pressure receiving body (4) is αR1, and the linear expansion coefficient of the support member aυ is αC, then the platen (2) and the dot printer head (1) when the temperature changes by ΔT.
The change in the head gap center (ΔT) between ΔT and ΔT is expressed by the following equation.

８（ΔＴ）＝ｓ−αＲＡ・ΔＴ＋αＣＡ′ΔＴ＝８＋（
αＣＡ’−αＲＡ）ΔＴ　゛ したがって、受圧体（４）の線膨張係数（材料）と厚さ
Ａとを定め、支持部材（１１Ｊの線膨張係数（材料）と
寸法Ａ′とを定めることにより、両者の線膨張変化量α
ＲＡとαＣＡ’とを等しくすることができ、温度変化に
拘わらずヘッドギャップＳを一定に保つことができ、こ
れによシ、印字の濃淡差の発生及びインクリボンによる
ペーパーの汚れを防止することができる。8(ΔT)=s−αRA・ΔT+αCA′ΔT=8+(
αCA'-αRA)ΔT ゛Therefore, by determining the linear expansion coefficient (material) and thickness A of the pressure receiving body (4), and determining the linear expansion coefficient (material) and dimension A' of the support member (11J), Linear expansion change amount α for both
RA and αCA' can be made equal, and the head gap S can be kept constant regardless of temperature changes, thereby preventing the occurrence of shading differences in printing and staining of the paper by the ink ribbon. I can do it.

ついで、この発明の第二の実施例を第４図及び第５図に
基いて説明する。前記実施例と同一部分は同一符号を用
い説明も省略する。横長の金属材によシ形成された芯材
（１７）の外面に合成樹脂製の受圧体ａ８を固定したプ
ラテン四が設けられている。Next, a second embodiment of the present invention will be explained based on FIGS. 4 and 5. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. A platen 4 is provided with a pressure receiving body a8 made of synthetic resin fixed to the outer surface of a core material (17) formed of a horizontally elongated metal material.

芯材ａηの両端は合成樹脂製の支持部材（２）に固定さ
れている。支持部材（イ）の一端縁Ｑυは基準縁ａ（至
）に接着剤ａ９によシ接着されているが、前記実施例同
様フレーム（６）に対する接着面積を大きくするために
接着補強片（１６１が一体的に形成されている。しかし
て、受圧体ａｌｌと支持部材（４）とは同一材料により
形成されて線膨張係数も等しい。また受圧体−の厚さＡ
と支持部材（至）の基準縁ａ３に対する固定端から芯材
ａ′ｒ）ｔでの寸法Ａ′とは等しく定められている。Both ends of the core material aη are fixed to support members (2) made of synthetic resin. One end edge Qυ of the support member (a) is bonded to the reference edge a (to) with an adhesive a9, but in order to increase the bonding area to the frame (6) as in the previous embodiment, an adhesive reinforcement piece (161 are integrally formed.The pressure receiving body all and the support member (4) are made of the same material and have the same coefficient of linear expansion.Also, the thickness A of the pressure receiving body
and the dimension A' at the core material a'r)t from the fixed end of the support member (to) with respect to the reference edge a3 are determined to be equal.

したがって、温度が変化してもＡ及びＡ′の線膨張変化
量は等しく、常にヘッドギャップＳを一定に保つことが
できる。Therefore, even if the temperature changes, the amount of change in linear expansion of A and A' is the same, and the head gap S can always be kept constant.

発明の効果 この発明は上述のように構成したので、プラテンの受圧
体の厚さが温度によシ変化したときに、プラテンの芯材
を保持する支持部材をフレームの基準縁を基準として膨
張及び収縮させることができ、この両者の線膨張変化量
を等しくして常にヘッドギャップを一定の範囲に保つこ
とができ、インクリボンによるペーパーの汚れを防止し
鮮明な印字状態を得ることができる等の効果を有するも
のである。Effects of the Invention Since the present invention is configured as described above, when the thickness of the pressure receiving body of the platen changes due to temperature, the support member that holds the core material of the platen expands and expands with respect to the reference edge of the frame. The head gap can be kept within a certain range by equalizing the amount of change in linear expansion between the two, preventing the paper from being smeared by the ink ribbon, and achieving clear printing. It is effective.

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

第１図ないし第３図はこの発明の第一の実施例を示すも
ので、第１図は側面図、第２図はプラテンの一端の支持
構造を示す分解斜視図、第３図はその水平断面図、第４
図及び第５図はこの発明の第二の実施例を示すもので、
第４図はプラテンの一端の支持構造を示す分解斜視図、
第５図はその水平断面図、第６図は従来例を示す側面図
である。 １・・・ドツトプリンタヘッド、２・・・プラテン、３
・・・芯材、４・・・受圧体、６・・・フレーム、１１
・・・支持部材、１３・・・基準縁、１４・・・一端縁
（固定端）、１７・・・芯材、１８・・・受圧体、１９
・・・プラテン、２０・・・支持部材、２１・・・一端
縁（固定端） 出　願　人　東京電気株式会社1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is an exploded perspective view showing the support structure at one end of the platen, and FIG. 3 is its horizontal view. Cross section, 4th
The figure and FIG. 5 show a second embodiment of this invention.
FIG. 4 is an exploded perspective view showing the support structure for one end of the platen;
FIG. 5 is a horizontal sectional view thereof, and FIG. 6 is a side view showing a conventional example. 1... Dot printer head, 2... Platen, 3
... core material, 4 ... pressure receiving body, 6 ... frame, 11
... Supporting member, 13... Reference edge, 14... One end edge (fixed end), 17... Core material, 18... Pressure receiving body, 19
...Platen, 20...Supporting member, 21...One end edge (fixed end) Applicant Tokyo Electric Co., Ltd.

Claims (1)

【特許請求の範囲】 １、　芯材の外面にドツトプリンタヘッドと対向する非
金属製の受圧体を固定してなるプラテンを設け、前記芯
材の両端を保持する左右一対の支持部材を設け、これら
の支持部材のドツトプリンタヘッド側の一端縁を左右の
フレームの基準縁に固定し、前記受圧体の厚さ方向の線
膨張変化量と、前記支持部材の前記基準縁に対する固定
端から前記芯材までの線膨張変化量とが同一温度条件に
おいて等しくなるように前記受圧体及び前記支持部材の
線膨張係数と寸法とを設定したことを特徴とするドツト
プリンタのヘッドギャップ温度補正装置。 ２、受圧体と支持部材とを同一線膨張係数の材料により
形成し、支持部材の基準縁に対する固定端から芯材まで
の寸法と受圧体の厚さとを等しく設定したことを特徴と
する特許請求の範囲第１項記載のドツトプリンタのヘッ
ドギャップ温度補正装置。[Scope of Claims] 1. A platen having a non-metallic pressure receiving body fixed thereto facing the dot printer head is provided on the outer surface of the core material, and a pair of left and right support members are provided to hold both ends of the core material. One end edge of the support member on the dot printer head side is fixed to the reference edge of the left and right frames, and the amount of linear expansion change in the thickness direction of the pressure receiving body and the distance from the fixed end of the support member with respect to the reference edge to the core material are determined. A head gap temperature correction device for a dot printer, characterized in that the linear expansion coefficients and dimensions of the pressure receiving body and the support member are set so that the amount of change in linear expansion of the pressure receiving body and the support member are equal under the same temperature condition. 2. A patent claim characterized in that the pressure receiving body and the supporting member are made of materials having the same coefficient of linear expansion, and the dimension from the fixed end to the core material with respect to the reference edge of the supporting member and the thickness of the pressure receiving body are set to be equal. A head gap temperature correction device for a dot printer according to item 1.
JP59083225A 1984-04-25 1984-04-25 Head gap temperature corrector for dot printer Granted JPS60225763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59083225A JPS60225763A (en) 1984-04-25 1984-04-25 Head gap temperature corrector for dot printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59083225A JPS60225763A (en) 1984-04-25 1984-04-25 Head gap temperature corrector for dot printer

Publications (2)

Publication Number Publication Date
JPS60225763A true JPS60225763A (en) 1985-11-11
JPH0254790B2 JPH0254790B2 (en) 1990-11-22

Family

ID=13796372

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59083225A Granted JPS60225763A (en) 1984-04-25 1984-04-25 Head gap temperature corrector for dot printer

Country Status (1)

Country Link
JP (1) JPS60225763A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5137377A (en) * 1990-01-31 1992-08-11 Brother Kogyo Kabushiki Kaisha Dot matrix printer having a print head position adjusting feature dependent on thermal deformation of platen or the like
WO2012172359A1 (en) * 2011-06-15 2012-12-20 Inca Digital Printers Ltd Print gap compensation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5137377A (en) * 1990-01-31 1992-08-11 Brother Kogyo Kabushiki Kaisha Dot matrix printer having a print head position adjusting feature dependent on thermal deformation of platen or the like
WO2012172359A1 (en) * 2011-06-15 2012-12-20 Inca Digital Printers Ltd Print gap compensation
US9216574B2 (en) 2011-06-15 2015-12-22 Inca Digital Printers Limited Print gap compensation

Also Published As

Publication number Publication date
JPH0254790B2 (en) 1990-11-22

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