JPH04251772A - Sheet thickness-detecting mechanism of impact printer - Google Patents
Sheet thickness-detecting mechanism of impact printerInfo
- Publication number
- JPH04251772A JPH04251772A JP896891A JP896891A JPH04251772A JP H04251772 A JPH04251772 A JP H04251772A JP 896891 A JP896891 A JP 896891A JP 896891 A JP896891 A JP 896891A JP H04251772 A JPH04251772 A JP H04251772A
- Authority
- JP
- Japan
- Prior art keywords
- pulse motor
- teeth
- ratio
- poles
- sheet thickness
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Common Mechanisms (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明はインパクトプリンタの紙
厚検出機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper thickness detection mechanism for an impact printer.
【0002】0002
【従来の技術】一般に、紙厚検出機構は図3に示すとお
り、パルスモータ1の回転を第1の減速ギア12、第2
の減速ギア13で減速し、偏心軸4を回転させてキャリ
ッジ5及びヘッド6を上下させる。そして、パルスモー
タ1にかかる負荷を、エンコーダ9の出力信号の周期の
変化から、後述の方法により検出し、ヘッド6先端が紙
面10に接触したことによる負荷上昇を検出して、先に
測定してあるプラテン7の表面位置との差を取ることに
よって紙厚を認知し、プラテンギャップ設定時のパラメ
ータとして使用している。2. Description of the Related Art Generally, as shown in FIG. 3, a paper thickness detection mechanism controls the rotation of a pulse motor 1 by first reducing gear
A reduction gear 13 is used to reduce the speed, and the eccentric shaft 4 is rotated to move the carriage 5 and head 6 up and down. Then, the load applied to the pulse motor 1 is detected from the change in the period of the output signal of the encoder 9 by the method described later, and the load increase due to the tip of the head 6 coming into contact with the paper surface 10 is detected and measured first. The paper thickness is recognized by taking the difference between the surface position of the platen 7 and the paper thickness, and is used as a parameter when setting the platen gap.
【0003】エンコーダの出力信号を負荷に換算するに
は、次式(1)を用いている。The following equation (1) is used to convert the encoder output signal into a load.
【0004】0004
【数1】[Math 1]
【0005】n:ステップ数(n≧48)Tm:パルス
モータ相切り換え周期
Tsum:負荷相当値
そして、Tsumが一定のスレッシュホールドレベルを
越えると、紙面検出と判断し、ただちにパルスモータ1
の回転を停止する。このような紙厚検出機構において、
従来、パルスモータ1の極数(ステップ数)は1回転に
つき48極であり、ピニオンギア18の歯数は18歯で
あった。n: Number of steps (n≧48) Tm: Pulse motor phase switching period Tsum: Load equivalent value Then, when Tsum exceeds a certain threshold level, it is determined that the paper surface has been detected, and the pulse motor 1 is immediately switched off.
stop rotating. In such a paper thickness detection mechanism,
Conventionally, the number of poles (number of steps) of the pulse motor 1 was 48 per rotation, and the number of teeth of the pinion gear 18 was 18.
【0006】[0006]
【発明が解決しようとする課題】前述の従来技術におい
ては、ピニオンギア18と減速ギア12との噛み合いに
よる負荷変動がエンコーダ出力信号周期に少なからず影
響を与え、紙厚検出の精度に悪影響を与えていた。[Problems to be Solved by the Invention] In the above-mentioned conventional technology, load fluctuations due to the meshing between the pinion gear 18 and the reduction gear 12 have a considerable effect on the encoder output signal cycle, and have a negative effect on the accuracy of paper thickness detection. was.
【0007】すなわち、従来は、パルスモータ1の極数
が48極で、ピニオンギア18の歯数が18歯であり、
両者の比は1: 2.66・・・となっていたので、
パルスモータの相切り換えによる位相の進みとギア1歯
ごとの噛み合い負荷による位相の遅れが1: 2.6
6・・・の割合で起こっていた。このため、パルスモー
タ1の相切り換えに対する実際の動きは複雑な振動を起
こし、これが紙厚検出の精度に悪影響ほ与えていた。That is, conventionally, the number of poles of the pulse motor 1 is 48, and the number of teeth of the pinion gear 18 is 18.
The ratio between the two was 1:2.66...so,
The phase advance due to phase switching of the pulse motor and the phase lag due to the meshing load of each gear tooth are 1: 2.6.
It was happening at a rate of 6... For this reason, the actual movement of the pulse motor 1 for phase switching causes complicated vibrations, which has an adverse effect on the accuracy of paper thickness detection.
【0008】そこで本発明はこのような問題点わ解決す
るもので、その目的は、ギアの噛み合いによる負荷変動
の影響を抑え、紙厚検出の精度を向上させるところにあ
る。The present invention is intended to solve these problems, and its purpose is to suppress the influence of load fluctuations due to gear meshing and improve the accuracy of paper thickness detection.
【0009】[0009]
【課題を解決するための手段】本発明の紙厚検出機構は
、パルスモータのピニオンギアの歯数とパルスモータの
極数との比を整数比にしたことを特徴とする。[Means for Solving the Problems] The paper thickness detection mechanism of the present invention is characterized in that the ratio of the number of teeth of the pinion gear of the pulse motor to the number of poles of the pulse motor is an integer ratio.
【0010】0010
【作用】ピニオンギアの歯数とパルスモータの極数との
比を整数比にすることで、パルスモータの相切り換えに
よる振動と、ギアの噛み合いによる負荷変動が一致し、
無駄な振動を抑制することができる。[Operation] By setting the ratio of the number of teeth of the pinion gear to the number of poles of the pulse motor to an integer ratio, vibrations caused by phase switching of the pulse motor and load fluctuations caused by gear engagement are matched.
It is possible to suppress unnecessary vibrations.
【0011】[0011]
【実施例】図1は、本発明の実施例である紙厚検出機構
の説明図であり、その基本動作は図3に示した従来技術
の所で説明してある内容と同じである。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a paper thickness detection mechanism according to an embodiment of the present invention, and its basic operation is the same as that explained in the prior art shown in FIG.
【0012】1はパルスモータ、2は第1の減速ギア、
3は第2の減速ギア、4は偏心軸、5はキャリッジ、6
はヘッド、7はプラテンである。1 is a pulse motor, 2 is a first reduction gear,
3 is a second reduction gear, 4 is an eccentric shaft, 5 is a carriage, 6
is a head, and 7 is a platen.
【0013】ここでパルスモータ1の極数は1回転につ
き48極であり、ピニオンギア8の歯数は24歯である
。したがってピニオンギア8の歯数とパルスモータ1の
ステップ数との比は1: 2である。The number of poles of the pulse motor 1 is 48 per rotation, and the number of teeth of the pinion gear 8 is 24. Therefore, the ratio between the number of teeth of pinion gear 8 and the number of steps of pulse motor 1 is 1:2.
【0014】このように両者の比を整数比とすることで
、パルスモータの相切り換えによる位相進みと、ギアの
噛み合いによる位相遅れとが1: 2の割合で一致し
、無駄な振動が抑制される。[0014] By setting the ratio of the two to an integer ratio in this way, the phase advance due to phase switching of the pulse motor and the phase lag due to gear meshing match at a ratio of 1:2, and unnecessary vibrations are suppressed. Ru.
【0015】図2はパルスモータにかかる負荷の変化を
視覚的に把握するためにエンコーダ信号の実測値を式(
1)により計算し、その結果をプロットしたもので、(
a)は18歯、(b)は24歯のピニオンギアの結果で
ある。FIG. 2 shows the actual measured value of the encoder signal expressed by the formula (
1) and plotted the results, (
A) is the result for a pinion gear with 18 teeth, and (b) is the result for a pinion gear with 24 teeth.
【0016】24歯のグラフ(b)と、18歯のグラフ
(a)の負荷変動の様子を比較してみると、紙面に当た
るまでの空走領域で明らかに振動のしかたに差がある。
18歯の方は、不定期的に大きな振動が生じ、これが紙
面検出(ピーク)の直前に起こるとその位置がずれてし
まい、精度低下の原因になっていた。Comparing the load fluctuations of the graph (b) for 24 teeth and the graph (a) for 18 teeth, it is clear that there is a difference in the way the vibrations occur in the idle running region up to the point where the teeth hit the paper. With the 18 teeth, large vibrations occurred irregularly, and if this occurred just before paper surface detection (peak), the position would shift, causing a decrease in accuracy.
【0017】これに対して24歯の方は、振動が単純で
その振幅が小さい為、ピーク付近での影響が小さく、精
度への影響も小さい。On the other hand, in the case of 24 teeth, since the vibration is simple and the amplitude is small, the influence near the peak is small, and the influence on accuracy is also small.
【0018】[0018]
【発明の効果】本発明によりパルスモータの無駄な振動
を抑えることで紙厚検出の精度を向上させることができ
、実用的効果は高い。[Effects of the Invention] According to the present invention, the accuracy of paper thickness detection can be improved by suppressing unnecessary vibrations of the pulse motor, and the practical effects are high.
【図1】本発明の紙厚検出機構の一実施例を示す斜視図
。FIG. 1 is a perspective view showing an embodiment of a paper thickness detection mechanism of the present invention.
【図2】紙厚検出時のエンコーダ信号周期を式(1)に
より計算した結果をプロットしたグラフ。FIG. 2 is a graph plotting the results of calculating the encoder signal period at the time of paper thickness detection using equation (1).
【図3】従来の機構を示す斜視図。FIG. 3 is a perspective view showing a conventional mechanism.
1 パルスモータ 2 減速ギア 3 減速ギア 4 偏心軸 5 キャリッジ 6 ヘッド 7 プラテン 8 ピニオンギア 9 エンコーダ 10 紙 1 Pulse motor 2 Reduction gear 3 Reduction gear 4 Eccentric shaft 5 Carriage 6 Head 7 Platen 8 Pinion gear 9 Encoder 10 Paper
Claims (1)
付けるキャリッジと、このキャリッジを上下させる偏心
軸と、この偏心軸を回転させるためのパルスモータと、
このパルスモータの回転を減速するためのピニオンギア
および減速ギアと、パルスモータの軸に取り付けられた
エンコーダとにより構成される紙厚検出機構において、
パルスモータのピニオンギアの歯数とパルスモータの極
数との比を整数比にしたことを特徴とするインパクトプ
リンタの紙厚検出機構。Claim 1: A print head, a carriage to which the print head is attached, an eccentric shaft for moving the carriage up and down, and a pulse motor for rotating the eccentric shaft.
In a paper thickness detection mechanism composed of a pinion gear and a reduction gear for decelerating the rotation of the pulse motor, and an encoder attached to the shaft of the pulse motor,
A paper thickness detection mechanism for an impact printer, characterized in that the ratio of the number of teeth of a pinion gear of a pulse motor to the number of poles of a pulse motor is an integer ratio.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP896891A JPH04251772A (en) | 1991-01-29 | 1991-01-29 | Sheet thickness-detecting mechanism of impact printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP896891A JPH04251772A (en) | 1991-01-29 | 1991-01-29 | Sheet thickness-detecting mechanism of impact printer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04251772A true JPH04251772A (en) | 1992-09-08 |
Family
ID=11707486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP896891A Pending JPH04251772A (en) | 1991-01-29 | 1991-01-29 | Sheet thickness-detecting mechanism of impact printer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04251772A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100544559B1 (en) * | 2001-08-21 | 2006-01-24 | 캐논 가부시끼가이샤 | Signal output apparatus and method, sheet material distinguishing apparatus and method, sheet material conveying apparatus, image forming apparatus and information output apparatus |
US7152861B2 (en) | 2002-06-04 | 2006-12-26 | Canon Kabushiki Kaisha | Double feed detection method and double feed detection apparatus of sheet materials |
US7426062B2 (en) | 2001-08-21 | 2008-09-16 | Canon Kabushiki Kaisha | Signal output apparatus, image forming apparatus and information output apparatus |
US7510085B2 (en) | 2002-11-14 | 2009-03-31 | Canon Kabushiki Kaisha | Apparatus for discriminating sheet material |
CN103106729A (en) * | 2012-12-24 | 2013-05-15 | 广州广电运通金融电子股份有限公司 | Sheet type medium thickness identifying device and identifying method thereof |
-
1991
- 1991-01-29 JP JP896891A patent/JPH04251772A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100544559B1 (en) * | 2001-08-21 | 2006-01-24 | 캐논 가부시끼가이샤 | Signal output apparatus and method, sheet material distinguishing apparatus and method, sheet material conveying apparatus, image forming apparatus and information output apparatus |
US7426062B2 (en) | 2001-08-21 | 2008-09-16 | Canon Kabushiki Kaisha | Signal output apparatus, image forming apparatus and information output apparatus |
US7583413B2 (en) | 2001-08-21 | 2009-09-01 | Canon Kabushiki Kaisha | Signal output and image forming apparatus with method of judging sheet type by impact detection |
US7152861B2 (en) | 2002-06-04 | 2006-12-26 | Canon Kabushiki Kaisha | Double feed detection method and double feed detection apparatus of sheet materials |
US7296795B2 (en) | 2002-06-04 | 2007-11-20 | Canon Kabushiki Kaisha | Double feed detection method and double feed detection apparatus of sheet materials |
US7510085B2 (en) | 2002-11-14 | 2009-03-31 | Canon Kabushiki Kaisha | Apparatus for discriminating sheet material |
US7866483B2 (en) | 2002-11-14 | 2011-01-11 | Canon Kabushiki Kaisha | Apparatus for discriminating sheet material |
CN103106729A (en) * | 2012-12-24 | 2013-05-15 | 广州广电运通金融电子股份有限公司 | Sheet type medium thickness identifying device and identifying method thereof |
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