JP2929335B2 - How to adjust the print density of a dot printer - Google Patents
How to adjust the print density of a dot printerInfo
- Publication number
- JP2929335B2 JP2929335B2 JP3313012A JP31301291A JP2929335B2 JP 2929335 B2 JP2929335 B2 JP 2929335B2 JP 3313012 A JP3313012 A JP 3313012A JP 31301291 A JP31301291 A JP 31301291A JP 2929335 B2 JP2929335 B2 JP 2929335B2
- Authority
- JP
- Japan
- Prior art keywords
- adjustment
- density
- printing
- hammer
- 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
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- Accessory Devices And Overall Control Thereof (AREA)
- Dot-Matrix Printers And Others (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、ドットプリンタの印字
濃度調整方法、具体的に云うと、ハンマバンクに搭載さ
れたハンマ調整装置の調整方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the printing density of a dot printer, and more particularly, to a method for adjusting a hammer adjusting device mounted on a hammer bank.
【0002】[0002]
【従来の技術】ラインプリンタのハンマバンクを構成す
る各印字ハンマには、各々印字濃度を可変できるよう
に、調整ネジなどを用いた調整機構を具備しており、印
字用紙上に印字された濃度を見て、適度な調整量を与
え、その結果を印字確認し、目標に対し差異があれば、
上記動作をハンマ毎に繰返し、結果として、十分に濃度
が高く、かつ均一になるよう官能調整を行っていた。上
記ハンマの印字濃度は調整量に応じて変化し、通常は正
の相関をもつが、フロントプレートやプラテンが存在す
るため、ある調整位置を境にそれが成り立たない領域
(正の調整量に対し、急激な濃度低下をおこす領域)が
存在し、これが自動化する場合問題となっている。図1
は調整ネジの回動により印字濃度が変化する状態を示す
ものであるが、aからbまでは調整ネジを回動するにつ
れて次第に印字濃度が増加するが、それ以上はフロント
プレート、実際にはプラテンの存在により印字動作させ
てもハンマピンの先端がインクリボンに密着してWのよ
うに印字されない状態となる。次に逆方向に調整ネジを
回動するとc→dのように濃度が変化する。前記印字さ
れない状態を「白抜け」と称し、自動化する場合、白抜
けを起さずに最適値に調整する必要がある。図2はライ
ンプリンタの印字濃度調整作業を自動化するために本発
明者等が開発した自動印字濃度調整装置を示すもので、
キャプスタン1により供給リール2から繰り出された印
字用紙3は、ガイドを通ってプラテン4上に巻掛けら
れ、計測ヘッド5を経由して、巻き取りリール(図示せ
ず)に到達するようになっている。一方、印字部は上記
印字用紙3上に印字をする部分であって、印字用紙3を
紙送りと直角方向に往復させるシャトル機構(図示せ
ず)と、円筒状のプラテン4および被調整体であるハン
マバンク6より構成される。7はパーソナルコンピュー
タを用いた制御装置で、各部分の制御を行うと共に計測
ヘッド部5によって検出した信号を記憶し、設定目標濃
度と比較し、濃度検出値が設定目標濃度に達していない
場合は、補正量を演算し、その演算値に応じて調整機8
に回転指令を与えて、調整ビット9により調整ネジ10
を調整してハンマの角度を変えハンマピンHPの突出状
態を調整して印字濃度の調整するものである。図3は印
字濃度調整のフローチャートを示すもので、先ず搭載し
たハンマバンク6又は印字濃度調整装置を相対横移動
(実施例ではハンマバンク6を横移動させる方式を採っ
た)させて調整ネジ10を調整ビット9と対向させ、次
に調整ビット9を前進させて調整ネジ10と係合させた
後印字を開始する。所定パターンを図4に示すように印
字後、計測ヘッド5の直下まで紙送りを行い、印字パタ
ーンの印字濃度を計測する。そして計測された印字濃度
と目標となる設定印字濃度との差異が極小の時は調整終
了とし、調整ビット9を退避した後、次のハンマの調整
に移る。それ以外では差異に応じた量を調整量として調
整部に指令するもので、例えば調整量は次式で与えられ
る。 調整量=K×(目標−計測値) 但し、K:定数又は変
数 この量を指令値として調整部に与え、調整ビット9によ
って調整ネジ10を回転する。それ以上を1サイクルと
して、通常は数サイクル繰り返すことによって、目標濃
度に到達する。ところが、図2に示した印字濃度調整装
置において、調整ねじ10を調整した場合、図5に示す
ような濃度特性を示すハンマの場合、ハンマピン調整中
に図6に示すように白抜け状態になることがあり、その
場合制御装置7は調整不足と判断して調整機8を印字濃
度が増す方向に調整することになるため、調整不能にな
った。そこで本発明は、調整中、白抜けを検出し、その
状態から脱出し、目標印字濃度に調整する自動濃度調整
方法を提供することを課題とするものである。2. Description of the Related Art Each print hammer constituting a hammer bank of a line printer is provided with an adjusting mechanism using an adjusting screw or the like so that the print density can be varied. , Give an appropriate adjustment amount, check the printing result, if there is a difference with the target,
The above operation was repeated for each hammer, and as a result, the sensory adjustment was performed so that the concentration was sufficiently high and uniform. The print density of the hammer changes according to the adjustment amount, and usually has a positive correlation. However, since the front plate and the platen are present, an area where the adjustment is not possible after a certain adjustment position (for the positive adjustment amount). , A region in which the density is sharply reduced), and this is a problem when it is automated. FIG.
Indicates the state in which the print density changes due to the rotation of the adjustment screw. From a to b, the print density gradually increases as the adjustment screw is rotated, but beyond that, the front plate, in fact the platen , The tip of the hammer pin comes into close contact with the ink ribbon and printing is not performed like W even when a printing operation is performed. Next, when the adjusting screw is rotated in the opposite direction, the density changes as c → d. The state in which the printing is not performed is referred to as “white spots”, and when automation is performed, it is necessary to adjust the value to an optimum value without causing white spots. FIG. 2 shows an automatic print density adjustment device developed by the present inventors to automate the print density adjustment work of a line printer.
The printing paper 3 fed from the supply reel 2 by the capstan 1 is wound around a platen 4 through a guide, and reaches a take-up reel (not shown) via a measuring head 5. ing. On the other hand, a printing section is a portion for printing on the printing paper 3 and includes a shuttle mechanism (not shown) for reciprocating the printing paper 3 in a direction perpendicular to the paper feed, and a cylindrical platen 4 and an adjustable body. It is composed of a certain hammer bank 6. Reference numeral 7 denotes a control device using a personal computer, which controls each part, stores a signal detected by the measurement head unit 5, compares the signal with a set target density, and when the detected density value does not reach the set target density. , A correction amount, and adjuster 8 according to the calculated value.
Is given a rotation command, and the adjustment screw 9 is
Is adjusted by changing the angle of the hammer to adjust the protruding state of the hammer pin HP to adjust the print density. FIG. 3 shows a flowchart of the print density adjustment. First, the mounted screw hammerbank 6 or the print density adjuster is relatively laterally moved (in the embodiment, the hammerbank 6 is laterally moved), and the adjustment screw 10 is set. After the adjustment bit 9 is opposed to the adjustment bit 9 and the adjustment bit 9 is advanced to engage with the adjustment screw 10, printing is started. After printing the predetermined pattern as shown in FIG. 4, the paper is fed just below the measuring head 5 to measure the print density of the print pattern. When the difference between the measured print density and the target set print density is extremely small, the adjustment is terminated. After the adjustment bit 9 is retracted, the process proceeds to the next hammer adjustment. In other cases, an amount corresponding to the difference is instructed to the adjustment unit as an adjustment amount. For example, the adjustment amount is given by the following equation. Adjustment amount = K × (target-measured value) where K: constant or variable This amount is given to the adjustment unit as a command value, and the adjustment screw 10 is rotated by the adjustment bit 9. The target concentration is reached by repeating the above cycle as one cycle, usually several cycles. However, in the print density adjusting device shown in FIG. 2, when the adjusting screw 10 is adjusted, in the case of a hammer exhibiting the density characteristics as shown in FIG. 5, a blank state occurs as shown in FIG. 6 during hammer pin adjustment. In such a case, the control device 7 determines that the adjustment is insufficient and adjusts the adjuster 8 in a direction to increase the print density. Accordingly, an object of the present invention is to provide an automatic density adjustment method for detecting a white spot during adjustment, exiting from the state, and adjusting to a target print density.
【0004】[0004]
【課題を解決するための手段】本発明は、上記の課題を
解決するためになされたもので、ドットプリンタのハン
マバンクを搭載し、印字動作・紙送り・印字濃度計測の
諸機能を備え、且つ前記ハンマバンク上のハンマの調整
機構を駆動する調整部と、印字濃度計測結果を記憶し、
演算結果に基づき各部の動作を制御する制御装置を備え
たドットプリンタの印字調整装置において、検査用印字
用紙に、少しづつ調整位置を変えて複数の印字を行い、
それらの印字濃度の計測を行うと共に、その計測値から
濃度勾配を演算し、この濃度勾配と前記印字濃度から調
整量を演算し、その値に基づき前記調整部を制御するよ
うにしたものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a hammerbank of a dot printer, and has various functions of printing operation, paper feeding, and printing density measurement. And an adjusting unit that drives an adjusting mechanism of the hammer on the hammer bank, and stores a print density measurement result,
In a print adjustment device of a dot printer equipped with a control device that controls the operation of each unit based on the calculation result, a plurality of printings are performed on the inspection printing paper by changing the adjustment position little by little,
The print density is measured, a density gradient is calculated from the measured value, an adjustment amount is calculated from the density gradient and the print density, and the adjustment unit is controlled based on the value. .
【作用】先に開発した図2に示す印字濃度調整装置は、
図4に示したように、一つの濃度を測るだけの為、果た
して、現在の調整位置が前記正の相関をもつ領域なの
か、あるいは、白抜け領域なのか区別がつかないので、
白抜け領域においては、誤った方向に調整量を与えるこ
とになった。本発明は、ハンマの各回目毎の調整の際、
所定微少量の調整変化を与えて、複数の印字を行い、そ
れを計測することにより、調整サイクル毎に濃度のみな
らず、濃度勾配を入力値より算定し、これら2つの入力
情報より例え白抜け領域にあっても1つの極大値をもつ
ハンマの最適点への調整動作が正しく継続するようにし
たものである。The printing density adjusting device shown in FIG.
As shown in FIG. 4, since only one density is measured, it cannot be distinguished whether the current adjustment position is the area having the positive correlation or the blank area.
In the blank area, the adjustment amount is given in the wrong direction. In the present invention, when adjusting each time of the hammer,
By performing a plurality of printings by giving a predetermined minute amount of adjustment change and measuring the same, not only the density but also the density gradient is calculated from the input values in each adjustment cycle, and even if these two pieces of input information are blank, The adjustment operation of the hammer having one local maximum value to the optimum point is correctly continued even in the region.
【0005】図7は本発明の実施例を示すもので、制御
装置71の機能以外、ハードウエア部分は図2に示した
先に開発した装置と同一なので、その部分についての説
明は省略する。図8は図7に示す実施例装置の調整動作
のフローチャートを示すもので、印字用紙3には図9に
示すように、ステップ21で初期状態での印字n1(n
1回目印字)を行い、ステップ23で初期状態から調整
ネジ10を微少量回転させた印字n2(n2回目印字)
を行った後、紙送り(ステップ24)をし、それらの濃
度D1,D2を計測ヘッド5で計測する。次に、これら
計測した濃度からステップ27で平均濃度DnmFIG. 7 shows an embodiment of the present invention. Since the hardware other than the function of the control device 71 is the same as that of the previously developed device shown in FIG. 2, the description of that portion will be omitted. FIG. 8 shows a flowchart of the adjustment operation of the embodiment apparatus shown in FIG. 7, and the printing paper 3 is printed in the initial state at step 21 as shown in FIG.
The first printing) is performed, and in Step 23, printing n2 (the n2th printing) in which the adjustment screw 10 is slightly rotated from the initial state.
Is performed, the paper is fed (step 24), and the densities D1 and D2 are measured by the measuring head 5. Next, in step 27, the average density Dnm
【数1】 と濃度勾配a(Equation 1) And concentration gradient a
【数2】 を演算し、平均濃度Dnmが下記(3)式次の条件を満
足しない場合(ステップ28)は調整完了となり、次の
ハンマの調整に移る。 DT−e≦Dnm≦DT+e…… (3) 一方、(3)式を満足し、濃度勾配がa>Oのときは、
ステップ30で目標値との濃度差Ddを演算し、更に調
整量x=Dd×cの演算を行い、(3式)を満足する
が、a>Oではない時は、ステップ32で目標値との濃
度差Ddと調整量x=Dd×dの演算を行って、それぞ
れの調整量xに応じて調整ネジ10を回動し、前述の動
作を繰り返えし、目標の濃度となるように調整を行う。
なおk(k>o),c,d(d>o),e(e≧o)は
それぞれ定数である。以上説明した例は、ネジ調整量の
異なる2つの印字を行い、その印字濃度を計測するよう
にした場合であるが、3種以上の印字及び印字濃度を計
測するようにしてもよい。しかし実務では2種類の印字
及びその濃度計測だけで充分である。図10はあるハン
マの調整過程を、そのサイクル毎に、調整位置に対する
濃度特性図上に図示したもので、調整時は、この特性は
全く未知である。今、第1サイクルにおいて、調整位置
の差が10degである近接した2つの状態で計測され
た濃度D1,D2が、それぞれ0.22D,0.25D
であるので、平均濃度Dn=0.235D,また濃度勾
配aは、(0.25−0.22)/10=0.003
(D/deg)となる。((b)図 参照) そこで、調整目標DT=0.4との差 Dd=0.16
5に応じて、調整量xを、x=Dd/aとすると、x=
55degを得るので、55deg正方向に回転指令を
出す。同様にして第2サイクルを終え、第3サイクルの
時、演算結果で濃度勾配がa<oとなり(白抜け検
出)、この時きは先ず負の調整量を与え(ここでは−
7.5deg)、正常領域へ復帰させ、第4サイクルで
−10degの調整によって目標濃度に収れんする。(Equation 2) If the average density Dnm does not satisfy the condition of the following equation (3) (step 28), the adjustment is completed, and the process proceeds to the next hammer adjustment. DT−e ≦ Dnm ≦ DT + e (3) On the other hand, when the expression (3) is satisfied and the concentration gradient is a> O,
In step 30, the density difference Dd from the target value is calculated, and further, the adjustment amount x = Dd × c is calculated. If equation (3) is satisfied, but a> O is not satisfied, in step 32, the target value and the target value are calculated. Of the density difference Dd and the adjustment amount x = Dd × d, the adjustment screw 10 is rotated according to each adjustment amount x, and the above operation is repeated so that the target density is obtained. Make adjustments.
Note that k (k> o), c, d (d> o), and e (e ≧ o) are constants. In the example described above, two prints with different screw adjustment amounts are performed, and the print density is measured. However, three or more types of prints and print densities may be measured. However, in practice, only two types of printing and its density measurement are sufficient. FIG. 10 shows the adjustment process of a certain hammer for each cycle on a density characteristic diagram with respect to an adjustment position. At the time of adjustment, this characteristic is completely unknown. Now, in the first cycle, the densities D1 and D2 measured in two adjacent states where the difference between the adjustment positions is 10 deg are 0.22D and 0.25D, respectively.
Therefore, the average density Dn = 0.235D and the density gradient a is (0.25-0.22) /10=0.003
(D / deg). (Refer to Fig. (B).) Then, the difference from the adjustment target DT = 0.4 Dd = 0.16
5, if the adjustment amount x is x = Dd / a, x =
Since 55 deg is obtained, a rotation command is issued in the 55 deg forward direction. Similarly, the second cycle is completed, and at the time of the third cycle, the density gradient becomes a <o in the calculation result (white spot detection). At this time, a negative adjustment amount is first given (here,-
7.5 deg), return to the normal region, and adjust to -10 deg in the fourth cycle to converge to the target concentration.
【発明の効果】以上のように本発明によれば、従来の装
置、構成を使用し、ソフトウエアの異なる制御装置71
を用い、複数の異なる印字と濃度計測を行い、各調整サ
イクル毎の複数の濃度計測値を演算処理するだけで、調
整量に対する濃度特性が全く未知であるハンマの調整に
おいて、白抜け時の性格、かつ速やかな対応のとれる調
整方法を提供できる。As described above, according to the present invention, the control device 71 using the conventional device and configuration and having different software is used.
By performing a plurality of different printing and density measurements, and calculating and processing a plurality of density measurement values for each adjustment cycle, the characteristics of white spots in hammer adjustment where the density characteristics for the adjustment amount are completely unknown In addition, it is possible to provide an adjustment method capable of promptly responding.
【図1】 ドットプリンタにおける白抜けの説明図であ
る。FIG. 1 is an explanatory diagram of white spots in a dot printer.
【図2】 先に開発した印字濃度調整装置の要部構成を
示す図である。FIG. 2 is a diagram showing a configuration of a main part of a print density adjusting device developed earlier.
【図3】 図2に示す装置の印字濃度調整のフローチャ
ートである。FIG. 3 is a flowchart of print density adjustment of the apparatus shown in FIG. 2;
【図4】 図2に示す装置の印字状態を示す図である。FIG. 4 is a diagram showing a printing state of the apparatus shown in FIG.
【図5】 あるヘッドの調整ネジの調整量と濃度変化を
示す図である。FIG. 5 is a diagram showing an adjustment amount of an adjustment screw of a certain head and a change in density.
【図6】 図5に示す特性のハンマを図2に示す装置で
印字濃度調整する場合の問題点を説明めいするための図
である。6 is a diagram for explaining a problem in the case where the hammer having the characteristic shown in FIG. 5 is adjusted in print density by the apparatus shown in FIG. 2;
【図7】 本発明の実施例の構成を示す図である。FIG. 7 is a diagram showing a configuration of an example of the present invention.
【図8】 図7に示す装置の印字濃度調整のフローチャ
ートである。FIG. 8 is a flowchart of print density adjustment of the apparatus shown in FIG. 7;
【図9】 本発明実施例における印字状態を示す図であ
る。FIG. 9 is a diagram showing a printing state in the embodiment of the present invention.
【図10】 図7に示す本発明にかゝる装置で、あるハ
ンマの印字濃度調整を行った場合の様子と実際のデータ
を示す図である。FIG. 10 is a diagram showing a state and actual data when a print density adjustment of a certain hammer is performed by the apparatus according to the present invention shown in FIG. 7;
1 キャプスタン 2 供給リール 3 印字用紙 4 プラテン 5 計測ヘッド 6 ハンマバンク 7,71 制御装置 8 調整機 9 調整ビット 10 調整ネジ 11 キーボード DESCRIPTION OF SYMBOLS 1 Capstan 2 Supply reel 3 Printing paper 4 Platen 5 Measurement head 6 Hammerbank 7,71 Controller 8 Adjuster 9 Adjustment bit 10 Adjustment screw 11 Keyboard
Claims (1)
し、印字動作・紙送り・印字濃度計測の諸機能を備え、
且つ前記ハンマバンク上のハンマの調整機構を駆動する
調整部と、印字濃度計測結果を記憶し、演算結果に基づ
き各部の動作を制御する制御装置を備えたドットプリン
タの印字調整装置において、 検査用印字用紙に少しづつ調整位置を変えて複数の印字
を行い、それらの印字濃度の計測を行うと共に、その計
測値から濃度勾配を演算し、この濃度勾配と前記印字濃
度から調整量を演算し、その値に基づき前記調整部を制
御することを特徴とするドットプリンタの印字濃度調整
方法。1. A hammerbank of a dot printer is mounted, and various functions of a printing operation, a paper feed, and a printing density measurement are provided.
And an adjustment unit for driving a hammer adjustment mechanism on the hammer bank, and a print adjustment device for a dot printer including a control device for storing a print density measurement result and controlling the operation of each unit based on a calculation result. A plurality of printings are performed by changing the adjustment position little by little on the printing paper, the printing density is measured, a density gradient is calculated from the measured value, and an adjustment amount is calculated from the density gradient and the printing density. A print density adjusting method for a dot printer, wherein the adjusting unit is controlled based on the value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3313012A JP2929335B2 (en) | 1991-09-20 | 1991-09-20 | How to adjust the print density of a dot printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3313012A JP2929335B2 (en) | 1991-09-20 | 1991-09-20 | How to adjust the print density of a dot printer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0577531A JPH0577531A (en) | 1993-03-30 |
JP2929335B2 true JP2929335B2 (en) | 1999-08-03 |
Family
ID=18036168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3313012A Expired - Lifetime JP2929335B2 (en) | 1991-09-20 | 1991-09-20 | How to adjust the print density of a dot printer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2929335B2 (en) |
-
1991
- 1991-09-20 JP JP3313012A patent/JP2929335B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0577531A (en) | 1993-03-30 |
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