JPH079362B2 - Length measuring instrument - Google Patents
Length measuring instrumentInfo
- Publication number
- JPH079362B2 JPH079362B2 JP61160591A JP16059186A JPH079362B2 JP H079362 B2 JPH079362 B2 JP H079362B2 JP 61160591 A JP61160591 A JP 61160591A JP 16059186 A JP16059186 A JP 16059186A JP H079362 B2 JPH079362 B2 JP H079362B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- moving
- fixed
- distance
- fixed contacts
- 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 - Fee Related
Links
- 239000000523 sample Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、電気抵抗を利用した長さ測定器に関する。TECHNICAL FIELD The present invention relates to a length measuring instrument using electric resistance.
［従来の技術］ この種の長さ測定器は、ある機械装置の中に組み込んで
利用することが多く、例えば、射出成形装置におけるプ
ランジャーの位置情報を取り出すことなどに利用してい
る。[Prior Art] This type of length measuring device is often used by incorporating it into a certain mechanical device, and is used, for example, for extracting position information of a plunger in an injection molding device.
従来、この種の長さ測定器では、長手方向に長尺の固定
抵抗体を配置して、この固定抵抗体に移動定子を接触さ
せながら、この固定抵抗体に沿ってその移動測定子を目
標位置まで移動させている。そして、固定抵抗体の基点
から移動測定子までの電気抵抗値を所定の電気的手段で
測定することによって、基点から移動測定子までの距離
を算出している。Conventionally, in this type of length measuring device, a long fixed resistor is arranged in the longitudinal direction, and while the moving sizing element is brought into contact with this fixed resistor, the moving measuring element is targeted along this fixed resistor. Moved to the position. Then, the electric resistance value from the base point of the fixed resistor to the moving probe is measured by a predetermined electric means to calculate the distance from the base point to the moving probe.
［発明が解決しようとする問題点］ 上述した従来の長さ測定器では、固定抵抗体における長
さ方向に渡る抵抗特性の直線性が、測定しようとする長
さの精度に直接影響してくる。したがって、固定抵抗体
は、その抵抗値が長手方向においてできるだけ均一にな
るように製造する必要がある。しかしながら、所定の長
さにわたって均一な抵抗体を製造することは非常にコス
トがかかる。例えば、500mmの長さにわたって±0.5％の
直線性を得るためには非常にコストが高くついてしま
う。[Problems to be Solved by the Invention] In the above-described conventional length measuring instrument, the linearity of the resistance characteristic in the fixed resistor over the length direction directly affects the accuracy of the length to be measured. . Therefore, it is necessary to manufacture the fixed resistor so that its resistance value is as uniform as possible in the longitudinal direction. However, producing a resistor that is uniform over a given length is very costly. For example, obtaining ± 0.5% linearity over a length of 500 mm is very expensive.
したがって、この発明の目的は、電気抵抗を利用した長
さ測定器において、コストが低くてしかも精度の高い長
さ測定器を提供することにある。Therefore, an object of the present invention is to provide a length measuring instrument utilizing electric resistance, which is low in cost and highly accurate.
［問題点を解決するための手段］ 前記目的を達成するために、この発明による長さ測定器
は、基点からそれぞれ所定の位置となるように一列に配
置した複数の固定接触子と、この固定接触子に接触しな
がら移動することができると共に、隣接する二つの固定
固定接触子間の距離よりも長く、かつ隣接する三つの固
定接触子にわたる距離よりも短い長さを有する移動抵抗
体と、この移動抵抗体に設けた測定子と、前記移動抵抗
体に接続した電源装置と、前記固定接触子のそれぞれに
接続した電気計測装置とを設けてある。そして、前記固
定接触子と前記移動抵抗体と前記電源装置と前記電気計
測装置とで電気回路を構成することによって基点と測定
子との距離を検出できるように構成してある。[Means for Solving the Problems] In order to achieve the above-mentioned object, a length measuring instrument according to the present invention includes a plurality of fixed contacts arranged in a row at predetermined positions from a base point, and a plurality of fixed contacts. A moving resistor capable of moving while contacting the contact, having a length longer than a distance between two adjacent fixed fixed contacts and shorter than a distance across three adjacent fixed contacts; A measuring element provided on the moving resistor, a power supply device connected to the moving resistor, and an electric measuring device connected to each of the fixed contacts are provided. The fixed contactor, the moving resistor, the power supply device, and the electrical measuring device constitute an electric circuit so that the distance between the base point and the probe can be detected.
［作用］ 移動抵抗体は、一つまたは二つの固定接触子と接触しな
がら移動する。それぞれの固定接触子と基点との距離は
あらかじめ定まっている。基点から移動抵抗体までの距
離は、移動抵抗体に接触する固定接触子と基点との間の
距離に、この固定接触子と移動抵抗体との相対位置関係
を加算することによって得られる。移動抵抗体の長さ
は、測定可能範囲と比較して非常に短くでき、この移動
抵抗体を均一に製造するのにそれほどコストはかからな
い。[Operation] The moving resistor moves while being in contact with one or two fixed contacts. The distance between each fixed contactor and the base point is predetermined. The distance from the base point to the moving resistor is obtained by adding the relative positional relationship between the fixed contactor and the moving resistor to the distance between the fixed contactor that contacts the moving resistor and the base point. The length of the moving resistor can be very short compared to the measurable range, and it is not very costly to manufacture this moving resistor uniformly.
［実施例］ 以下、添付図面を参照してこの発明の実施例を詳しく説
明する。Embodiments Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
第１図は、この発明による長さ測定器の一実施例の概念
図である。基点Ａから等間隔に固定接触子１を一列に配
置してある。移動抵抗体２は、固定接触子１の列に電気
的に接触しながらこの列に沿って移動できる。移動抵抗
体２の長さは、隣接する二つの固定接触子１の間の距離
よりも長く、かつ、隣接する三つの固定接触子１にわた
る距離よりも短くしてある。第１図では、移動抵抗体２
は、Ｂ点にある固定接触子１とＣ点にある固定接触子１
の両方に接触している。移動抵抗体２の長手方向中央部
には測定子３を設けてある。移動抵抗体２の両端には導
線４、５を接続してあり、これらの導線４、５は後述す
る電圧源に接続してある。固定接触子１のそれぞれにも
導線６を接続してあり、この導線６は後述する電気計測
装置に接続してある。FIG. 1 is a conceptual diagram of an embodiment of a length measuring device according to the present invention. The fixed contacts 1 are arranged in a line at equal intervals from the base point A. The moving resistor 2 can move along the row of fixed contacts 1 while electrically contacting the row. The length of the moving resistor 2 is longer than the distance between two adjacent fixed contacts 1 and shorter than the distance over the three adjacent fixed contacts 1. In FIG. 1, the moving resistor 2
Is the fixed contactor 1 at point B and the fixed contactor 1 at point C
Are in contact with both. A tracing stylus 3 is provided at the center of the moving resistor 2 in the longitudinal direction. Conductors 4 and 5 are connected to both ends of the moving resistor 2, and these conductors 4 and 5 are connected to a voltage source described later. A lead wire 6 is also connected to each of the fixed contacts 1, and the lead wire 6 is connected to an electric measuring device described later.
第２図は、第１図に示す実施例の電気回路図を示す。移
動抵抗体２に接続した導線４は直流5Vの電圧源７の正極
に接続してあり、導線５は負極に接続してある。この固
定接触子１に接続したそれぞれの導線６は電気計測装置
８に接続してある。この電気計測装置８は電圧選択装置
９と表示装置10とを含む。電圧選択装置９は、それぞれ
の固定接触子１からの電圧信号のうち、目的とする電圧
信号を選択し、かつその電圧信号を発生する固定接触子
１の位置番号を決定する。これらの電圧情報11と接触位
置情報12とを表示装置10に送って、移動抵抗体２の測定
子３の位置を表示する。この電気計測装置８のさらに詳
しい働きについては後述する。FIG. 2 shows an electric circuit diagram of the embodiment shown in FIG. The conducting wire 4 connected to the moving resistor 2 is connected to the positive electrode of a DC 5V voltage source 7, and the conducting wire 5 is connected to the negative electrode. Each conducting wire 6 connected to this fixed contact 1 is connected to an electric measuring device 8. The electrical measuring device 8 includes a voltage selection device 9 and a display device 10. The voltage selection device 9 selects a target voltage signal from the voltage signals from the respective fixed contacts 1 and determines the position number of the fixed contact 1 that generates the voltage signal. The voltage information 11 and the contact position information 12 are sent to the display device 10 to display the position of the probe 3 of the moving resistor 2. The more detailed operation of the electric measuring device 8 will be described later.
次に第１図と第２図に示した実施例の作用を説明する。
移動抵抗体２が第１図の左から右に移動していくと、そ
れぞれの固定接触子１の出力電圧が変化していく。第３
図は、固定接触子１の出力電圧の変化の一例を示したも
のである。第３図の横軸には移動抵抗体２の移動距離を
とり、縦軸には固定接触子１の出力電圧をとってある。
Ｂ点の固定接触子１を考えると、その出力電圧VBは、最
初に5Vとなり、移動抵抗体２の右への移動につれて直線
的に減少していく。電圧VBが1Vになると、Ｃ点の固定接
触子１が移動抵抗体２に接触し始め、出力電圧VCが5Vを
示す。VBが1Vから0Vまでの間すなわち距離L1の間は、Ｂ
点とＣ点の両方の固定接触子１に移動抵抗体２が接触す
ることになる。Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.
As the moving resistor 2 moves from the left to the right in FIG. 1, the output voltage of each fixed contact 1 changes. Third
The figure shows an example of changes in the output voltage of the fixed contact 1. The horizontal axis of FIG. 3 represents the moving distance of the moving resistor 2, and the vertical axis represents the output voltage of the fixed contact 1.
Considering the fixed contactor 1 at the point B, its output voltage V B first becomes 5 V and linearly decreases as the moving resistor 2 moves to the right. When the voltage V B becomes 1 V, the fixed contact 1 at the point C begins to come into contact with the moving resistor 2, and the output voltage V C shows 5 V. When V B is between 1 V and 0 V, that is, during the distance L 1 , B
The moving resistor 2 comes into contact with the fixed contacts 1 at both the points C and C.
移動抵抗体２の両端は、一般に抵抗の均一性があまりく
ないので、固定接触子１の出力電圧のうち4.5V以上の電
圧と0.5V以下の電圧は距離測定に利用しないようにして
ある。すなわち、第３図の斜線で覆った部分は距離測定
に利用しない。VBが0.5Vまで下がるとVCがちょうど4.5V
になり、有効な出力電圧が常に確保されると共に、出力
電圧が一義的に定まるようになっている。上限4.5V及び
下限0.5Vの値は、電圧選択装置９内のコンパレータを利
用して設定できる。そして、このコンパレータを通過し
た電圧の値すなわち電圧情報11と、その電圧を発生して
いる固定接触子１の位置番号すなわち接触位置情報12と
が表示装置10に送られることになる。Since both ends of the moving resistor 2 generally do not have a very uniform resistance, voltages of 4.5 V or more and 0.5 V or less of the output voltage of the fixed contact 1 are not used for distance measurement. That is, the shaded area in FIG. 3 is not used for distance measurement. When V B drops to 0.5V, V C becomes just 4.5V
Therefore, an effective output voltage is always secured and the output voltage is uniquely determined. The upper limit of 4.5 V and the lower limit of 0.5 V can be set using the comparator in the voltage selection device 9. Then, the value of the voltage that has passed through this comparator, that is, the voltage information 11, and the position number of the fixed contact 1 that is generating that voltage, that is, the contact position information 12, are sent to the display device 10.
表示装置10では、接触位置情報12を基に、移動抵抗体２
が有効に接触している固定接触子１の距離を算出し、さ
らに電圧情報11を基に、当該固定接触子１から移動抵抗
体２上の測定子３までの距離を算出する。そして、これ
らの二つの距離を加算するこによって基点から測定子３
までの距離を求め、これを表示している。In the display device 10, based on the contact position information 12, the moving resistor 2
Calculates the distance of the fixed contact 1 that is in effective contact with the fixed contact 1, and further calculates the distance from the fixed contact 1 to the probe 3 on the moving resistor 2 based on the voltage information 11. Then, by adding these two distances from the base point to the probe 3
The distance to is calculated and displayed.
［発明の効果］ 以上説明したようにこの発明は、複数の固定接触子と、
この固定接触子に接触しながら移動できて隣接する二つ
の固定接触子間の距離よりも長くかつ隣接する三つの固
定接触子にわたる距離よりも短い長さを有する移動抵抗
体とを利用して長さ測定を行なうようにしたので、測定
可能範囲と比較して移動抵抗体の長さを非常に短くで
き、低いコストで精度の高い長さ測定器を得ることがで
きる。[Advantages of the Invention] As described above, the present invention includes a plurality of fixed contacts.
A moving resistor having a length that is longer than the distance between two adjacent fixed contacts and shorter than the distance between three adjacent fixed contacts while being able to move while contacting this fixed contact. Since the length measurement is performed, the length of the moving resistor can be made extremely shorter than the measurable range, and a highly accurate length measuring device can be obtained at low cost.
第１図はこの発明による長さ測定器の一実施例の概念
図、第２図は第１図に示す実施例の電気回路図、第３図
は第１図に示す実施例の固定接触子の出力電圧の変化を
示したグラフである。 １……固定接触子、２……移動抵抗体、３……測定子、
７……電圧源、８……電気計測装置、Ａ……基点。FIG. 1 is a conceptual diagram of an embodiment of a length measuring instrument according to the present invention, FIG. 2 is an electric circuit diagram of the embodiment shown in FIG. 1, and FIG. 3 is a fixed contact of the embodiment shown in FIG. 5 is a graph showing changes in the output voltage of the. 1 ... Fixed contact, 2 ... Moving resistor, 3 ... Measuring element,
7 ... voltage source, 8 ... electrical measuring device, A ... base point.
Claims (1)
一列に配置した複数の固定接触子と、この固定接触子に
接触しながら移動できて隣接する二つの固定接触子間の
距離よりも長くかつ隣接する三つの固定接触子にわたる
距離よりも短い長さを有する移動抵抗体と、この移動抵
抗体に設けた測定子と、前記移動抵抗体に接続した電源
装置と、前記固定接触子のそれぞれに接続した電気計測
装置とを設け、前記固定接触子と前記移動抵抗体と前記
電源装置と前記電気計測装置とで電気回路を構成するこ
とによって基点と測定子との距離を検出できるように構
成したことを特徴とする長さ測定器。1. A plurality of fixed contacts arranged in a line from a base point so as to be at predetermined positions, and a distance between two adjacent fixed contacts that can move while contacting the fixed contacts. And each of the moving resistor having a length shorter than the distance over the three adjacent fixed contacts, the probe provided on the moving resistor, the power supply device connected to the moving resistor, and the fixed contact. And an electric measuring device connected to the electric measuring device, and the fixed contact, the moving resistor, the power supply device, and the electric measuring device constitute an electric circuit so that the distance between the base point and the measuring element can be detected. The length measuring instrument characterized by having done.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61160591A JPH079362B2 (en) | 1986-07-08 | 1986-07-08 | Length measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61160591A JPH079362B2 (en) | 1986-07-08 | 1986-07-08 | Length measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6316201A JPS6316201A (en) | 1988-01-23 |
| JPH079362B2 true JPH079362B2 (en) | 1995-02-01 |
Family
ID=15718261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61160591A Expired - Fee Related JPH079362B2 (en) | 1986-07-08 | 1986-07-08 | Length measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079362B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5768927A (en) * | 1991-03-29 | 1998-06-23 | Hitachi Ltd. | Rolling mill, hot rolling system, rolling method and rolling mill revamping method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144302A (en) * | 1984-08-07 | 1986-03-04 | Mitsubishi Electric Corp | Digital display type measuring instrument |
-
1986
- 1986-07-08 JP JP61160591A patent/JPH079362B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6316201A (en) | 1988-01-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |