JPH0254790B2 - - Google Patents
Info
- Publication number
- JPH0254790B2 JPH0254790B2 JP59083225A JP8322584A JPH0254790B2 JP H0254790 B2 JPH0254790 B2 JP H0254790B2 JP 59083225 A JP59083225 A JP 59083225A JP 8322584 A JP8322584 A JP 8322584A JP H0254790 B2 JPH0254790 B2 JP H0254790B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure receiving
- receiving body
- core material
- linear expansion
- support member
- 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.)
- Expired - Lifetime
Links
- 239000011162 core material Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 description 6
- 239000000057 synthetic resin Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010186 staining Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
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ツドギヤツプ
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、ドツトプリンタヘツド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によりペー
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ツド１とプラテン
２との間のヘツドギヤツプｓを0.02〜0.05mm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
のそれよりも大きいため厚さＡ方向の線膨張変化
量が大きくなり、ヘツドギヤツプ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12.7mmの場合、50℃変化するとＡの値は
0.06〜0.09変化する。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りドツトプリンタ
ヘツド１の個々のニードルのプラテン２に対する
ギヤツプにバラツキが生じる。ｓ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。Technical background of the invention and its problems As shown in Figure 6, a dot printer head 1
The platen 2 facing the platen 2 is often made of a metal core 3 with a pressure receiving body 4 fixed to the outer surface made of hard rubber or synthetic resin. When the paper 5 is fed by the platen 2, both the pressure receiving body 4 and the core material 3 have a circular cross section, but when the paper 5 is fed by other rollers, the cross section is not necessarily circular. In any case, it is well known that in the case of a dot printer, the head gap s between the dot printer head 1 and the platen 2 must be adjusted within a narrow range of 0.02 to 0.05 mm. 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 lower than that of the core material 3.
Since it is larger than that of , the amount of change in linear expansion in the direction of thickness A becomes large, making it impossible to control the head gap s within a narrow tolerance range. For example, if A is 12.7mm, if the temperature changes by 50℃, the value of A will be
Changes from 0.06 to 0.09. If the thickness A of the pressure receiving body 4 is made small, the amount of change in linear expansion can be made small, but the radius of the arc of the outer periphery becomes small and variations occur in the gaps of the individual needles of the dot printer head 1 with respect to the platen 2. If s is large, the print will be thin, and if s is small, there is a problem that the paper 5 will be rubbed by the ink ribbon and smeared.
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ツドギヤツプを一定の
範囲内に維持することができるドツトプリンタの
ヘツドギヤツプ温度補正装置をうることを目的と
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ツ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
変化量とを等しくし、したがつて、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ツド
ギヤツプを維持し、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 designed to be transparent.
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にキヤリアシヤフト７とガイド
シヤフト８とが架設され、ドツトプリンタヘツド
１を搭載したキヤリア９がこれらのシヤフト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. A carrier shaft 7 and a guide shaft 8 are installed on opposite frames 6, and a carrier 9 carrying a dot printer head 1 moves these shafts 7,
8 and is slidably held. Platen 2
A cylindrical pressure receiving body 4 made of synthetic resin is 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 set to dimension A.
ついで、芯材３を回転自在に支承するブツシユ
１０が取付けられた合成樹脂製の支持部材１１が
設けられている。フレーム６には角孔１２が形成
され、角孔１２の一辺の基準縁１３に支持部材１
１のドツトプリンタヘツド１側の一側縁１４が接
着剤１５等により固定されている。支持部材１１
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１６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１４である。角孔１
２は支持部材１１が温度変化により膨張及び収縮
するように支持部材１１より大きく形成されてい
る。 Next, a support member 11 made of synthetic resin is provided to which a bush 10 for rotatably supporting the core member 3 is attached. A square hole 12 is formed in the frame 6, and a support member 1 is attached to a reference edge 13 on one side of the square hole 12.
One side edge 14 of one dot printer head 1 is fixed with an adhesive 15 or the like. Support member 11
has an adhesive reinforcing piece 16 to increase the adhesive area to the frame 6, but the fixed end to the frame 6 is substantially one end edge 14. Square hole 1
2 is formed larger than the support member 11 so that the support member 11 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ツチ送り、キヤリア９を移動
して印字を行なう。そして、温度変化によりプラ
テン２の受圧体４の厚さＡが変化し、支持部材１
１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
αR、支持部材１１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
ンタヘツド１との間のヘツドギヤツプｓ（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 one pitch, and the carrier 9 is moved to perform printing. Then, the thickness A of the pressure receiving body 4 of the platen 2 changes due to the temperature change, and the thickness A of the pressure receiving body 4 of the platen 2 changes.
The dimension A' from the fixed end to the core material 3 with respect to the reference edge 13 of 1 also changes, but if the linear expansion coefficient of the pressure receiving body 4 is α R and the linear expansion coefficient of the support member 11 is α C , the temperature changes by ΔT. Head gap s (ΔT) between platen 2 and dot printer head 1 when
The change in is expressed by the following formula.
ｓ（ΔT）＝ｓ−αRＡ・ΔT＋αCA′ΔT
＝ｓ＋（αCA′−αRＡ）ΔT
したがつて、受圧体４の線膨張係数（材料）と
厚さＡとを定め、支持部材１１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αRＡとαCA′とを等しくすることがで
き、温度変化に拘わらずヘツドギヤツプｓを一定
に保つことができ、これにより、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。s(ΔT)=s−α R A・ΔT+α C A′ΔT = s+(α C A′−α R A)ΔT Therefore, determine the linear expansion coefficient (material) and thickness A of the pressure receiving body 4. By determining the coefficient of linear expansion (material) and dimension A' of the support member 11, the linear expansion changes α R A and α C A' of both can be made equal, and the head gap s can be maintained regardless of temperature changes. can be kept constant, thereby preventing the occurrence of shading differences in printing and staining of the paper by the ink ribbon.
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
により形成された芯材１７の外面に合成樹脂製の
受圧体１８を固定したプラテン１９が設けられて
いる。芯材１７の両端は合成樹脂製の支持部材２
０に固定されている。支持部材２０の一端縁２１
は基準縁１３に接着剤１５により接着されている
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１６が一体的に形
成されている。しかして、受圧体１８と支持部材
２０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１８の厚さＡと支持部材２０
の基準縁１３に対する固定端から芯材１７までの
寸法A′とは等しく定められている。 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 19 is provided on the outer surface of a core material 17 formed of a horizontally elongated metal material, and a pressure receiving body 18 made of synthetic resin is fixed thereto. Both ends of the core material 17 are supported by synthetic resin support members 2.
Fixed to 0. One end edge 21 of the support member 20
is bonded to the reference edge 13 with an adhesive 15, but an adhesive reinforcing piece 16 is integrally formed in order to increase the bonding area to the frame 6, as in the previous embodiment. Therefore, the pressure receiving body 18 and the support member 20 are made of the same material and have the same coefficient of linear expansion. Also, the thickness A of the pressure receiving body 18 and the support member 20
The dimension A' from the fixed end with respect to the reference edge 13 to the core material 17 is determined to be equal.
したがつて、温度が変化してもＡ及びA′の線
膨張変化量は等しく、常にヘツドギヤツプ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り変化したときに、
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
ツドギヤツ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 can be expanded and contracted with respect to the reference edge of the frame, and the amount of change in linear expansion of the two can be made equal, so that the head gap can always be kept within a certain range. This has the effect of preventing stains on the paper due to the staining of the paper and making it possible to obtain clear printing.
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……ドツトプリンタヘツド、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、２
１……一端縁（固定端）。
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. The sectional view, FIGS. 4 and 5 show a second embodiment of the present invention. FIG. 4 is an exploded perspective view showing the support structure at one end of the platen, and FIG. 5 is a horizontal sectional view thereof. FIG. 6 is a side view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Dot printer head, 2... Platen, 3... Core material, 4... Pressure receiving body, 6... Frame, 11... Support member, 13... Reference edge, 14...
... one end edge (fixed end), 17 ... core material, 18 ... pressure receiving body, 19 ... platen, 20 ... support member, 2
1... One end edge (fixed end).
Claims (1)
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
ツ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
るドツトブリンタのヘツドギヤツプ温度補正装
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ツドギヤツプ温度補正装
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, a pair of left and right support members are provided to hold both ends of the core material, and these 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 is equal under the same temperature conditions. 2. A patent claim characterized in that the pressure receiving body and the supporting member are formed 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 is set equal to the thickness of the pressure receiving body. A head gap temperature correction device for a dot printer according to scope 1.
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 JPS60225763A (en) | 1985-11-11 |
| JPH0254790B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03224775A (en) * | 1990-01-31 | 1991-10-03 | Brother Ind Ltd | Printing apparatus |
| GB2491868A (en) * | 2011-06-15 | 2012-12-19 | Inca Digital Printers Ltd | Print gap compensation |
-
1984
- 1984-04-25 JP JP59083225A patent/JPS60225763A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60225763A (en) | 1985-11-11 |
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