JP2507042Y2 - Grinding wheel measuring device - Google Patents
Grinding wheel measuring deviceInfo
- Publication number
- JP2507042Y2 JP2507042Y2 JP1990112202U JP11220290U JP2507042Y2 JP 2507042 Y2 JP2507042 Y2 JP 2507042Y2 JP 1990112202 U JP1990112202 U JP 1990112202U JP 11220290 U JP11220290 U JP 11220290U JP 2507042 Y2 JP2507042 Y2 JP 2507042Y2
- Authority
- JP
- Japan
- Prior art keywords
- grindstone
- grinding
- grinding surface
- detection block
- measuring device
- 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
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Machine Tool Sensing Apparatuses (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、たとえばNC制御による研削盤の研削砥石の
研削面部分の形状を高い精度で測定できるようにした砥
石の測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a grindstone measuring device capable of measuring the shape of a grinding surface portion of a grindstone of a grinder by NC control with high accuracy, for example.
NC研削盤に用いられる研削砥石は、高い研削精度が要
求されることから、研削面の表面形状は厳しくチェック
される。研削砥石をその中心を含む半径方向で切ったと
きの研削面の断面は、先端側が円弧状となる曲面形状で
あり、その表面は真円状に設定される。そして、ワーク
を研削してゆくときには、研削砥石の研削面も次第に摩
耗してゆくので、定期的に研削面をチェックする必要が
あり、従来では投影器によって拡大して目視によって確
認することが行われている。Since the grinding wheel used in the NC grinder requires high grinding accuracy, the surface shape of the grinding surface is strictly checked. The cross section of the ground surface when the grinding wheel is cut in the radial direction including the center thereof has a curved surface shape in which the tip side is arcuate, and the surface is set to be a perfect circle. When grinding the workpiece, the grinding surface of the grinding wheel gradually wears away, so it is necessary to check the grinding surface regularly.In the past, it was possible to enlarge the size with a projector and visually check it. It is being appreciated.
しかしながら、この方法では正確な円弧半径値や中心
位置が得られず、輪郭研削した被加工物の形状精度が低
下したり、またそれらの値がずれていた場合、これを補
正する機能を備えたNC研削盤に直接そのデータを入力し
て必要な補正を行わせることができないという問題があ
った。However, with this method, accurate arc radius values and center positions cannot be obtained, and if the shape accuracy of the workpiece that has undergone contour grinding decreases, and if these values deviate, a function to correct them is provided. There was a problem that it was not possible to input the data directly into the NC grinder and make the necessary corrections.
これに対し、特開昭62-157773号公報には、砥石に接
触させて接触点の位置を検出する検出手段を設けて研削
面の形状を測定する装置が提案されている。検出手段は
圧電素子を利用したもので、研削砥石の表面が衝き当た
ったときの振動をセンサで感知し、これを制御部の演算
回路に入力して研削面の半径とその中心位置を算出し、
予め設定した基準値と比較して研削砥石の軸心を設定し
直す制御を行なう。On the other hand, Japanese Unexamined Patent Publication No. 62-157773 proposes a device for measuring the shape of a ground surface by providing a detecting means for contacting a grindstone to detect the position of a contact point. The detection means uses a piezoelectric element.The sensor detects the vibration when the surface of the grinding wheel hits and inputs it to the arithmetic circuit of the control unit to calculate the radius of the grinding surface and its center position. ,
Control is performed to reset the axis of the grinding wheel by comparing it with a preset reference value.
この装置では、円弧面の半径とその中心位置を測定す
るため、検出手段を円弧断面の最も先端部及びその両側
の３点に接触させ、これらの値から測定値を算出する。
そして、研削砥石への３点の接触のために、検出手段は
研削砥石の先端部を巡るように旋回させる機構に連接さ
れている。In this device, in order to measure the radius of the arc surface and the center position thereof, the detecting means is brought into contact with the most distal end of the arc cross section and three points on both sides thereof, and the measured value is calculated from these values.
The detecting means is connected to a mechanism for turning around the tip of the grinding wheel in order to contact the grinding wheel at three points.
このような接触方式の測定によって得られた測定結果
をNC制御装置にフィードバックすることにより、NC研削
盤の持つ補正機能を有効に活用することができる。By feeding back the measurement result obtained by such a contact type measurement to the NC control device, the correction function of the NC grinder can be effectively utilized.
ところが、測定に際しては、研削砥石に対する検出手
段の接触位置がずれないようにすることが重要である。
このため、検出手段を旋回させる機構自体にも高い精度
が要求され、このことから機構が複雑になり装置も大型
にならざるを得ない。また、精密表面加工ではその精度
の良否が製品に大きな影響を与えるので、旋回機構の作
動不良や誤差を含んだ作動は測定不良だけでなくワーク
の加工にも悪い影響を及ぼす。たとえば、温度や湿度等
の条件変化でも、精密加工の点からみれば旋回機構の回
転停止精度や位置決め精度が測定誤差を大きくするた
め、NC研削盤への補正値の信頼性は高いものではなかっ
た。However, at the time of measurement, it is important not to shift the contact position of the detecting means with respect to the grinding wheel.
For this reason, high precision is also required for the mechanism itself for rotating the detecting means, which complicates the mechanism and inevitably increases the size of the device. Further, in precision surface processing, the accuracy of the surface has a great influence on the product. Therefore, the malfunction of the swivel mechanism or the operation including an error adversely affects not only the measurement failure but also the machining of the work. For example, even if the conditions such as temperature and humidity change, from the viewpoint of precision processing, the rotation stop accuracy and positioning accuracy of the swivel mechanism increase the measurement error, so the reliability of the correction value to the NC grinder is not high. It was
本考案において解決すべき課題は、簡単な構造で高い
精度の研削砥石の研削面を測定できるようにすることに
ある。The problem to be solved in the present invention is to make it possible to measure the grinding surface of a grinding wheel with a simple structure and high accuracy.
本考案は、研削盤のテーブルに備えられ、研削面を円
弧状の断面形状に成形した砥石に対して前記研削面の形
状を、円弧面の異なる３点の位置を検出して前記砥石の
研削面の中心と半径の大きさを演算することによって測
定する測定装置であって、前記測定装置は前記砥石の円
弧状の研削面に接触する検出ブロックと、該検出ブロッ
クが受ける振動を検知して前記演算を実行する制御部に
信号を入力する検出器とを備え、前記検出ブロックは、
前記研削面の先端部に接触する平面部を上端に凸となる
ように成形すると共に、該平面部の両側から下向きの勾
配を持ち前記研削面の先端部から離れた２点にそれぞれ
接触する傾斜部とを備え、これらの平面部及び傾斜部の
それぞれの形状及び前記検出ブロックの位置を予め既知
として前記制御部の演算系に格納し、前記平面部及び左
右の傾斜部のそれぞれによって前記研削面の軸線と直交
する平面で切ったときの該研削面の異なる３点の位置の
検出によりその外径及び中心位置を前記制御部によって
演算可能としたことを特徴とする。The present invention is provided on a table of a grinder, and grinds the grindstone by detecting the shape of the grind surface with respect to a grindstone whose ground surface is formed into an arcuate cross-sectional shape, and detecting three positions of different arc surfaces. A measuring device that measures by calculating the size of the center and radius of the surface, the measuring device detecting the detection block contacting the arc-shaped grinding surface of the grindstone, and detecting the vibration received by the detection block. A detection unit for inputting a signal to a control unit that executes the calculation, wherein the detection block is
A flat part that comes into contact with the tip of the grinding surface is formed so as to have a convex shape at the upper end, and a slope that has a downward slope from both sides of the flat part and that comes into contact with two points apart from the tip of the grinding surface. And the shape of each of the flat surface portion and the inclined portion and the position of the detection block are stored in the arithmetic system of the control unit as known in advance, and the flat surface portion and the left and right inclined portions are used to store the grinding surface. The outer diameter and the central position of the grinding surface can be calculated by the control unit by detecting the positions of three different points on the ground surface when the grinding surface is cut along a plane orthogonal to the axis line.
検出ブロックは平面部と一対の傾斜部とを砥石の研削
面との接触面として備えているので、テーブルを動かし
て接触点を変えるようにすれば、検出ブロックの姿勢を
変えることなく円弧状断面の研削面の３点に接触させる
ことができる。このため、検出ブロックを旋回させたり
する機構が不要となり、簡単な構造で高い精度の研削面
の測定が可能となる。Since the detection block has a flat portion and a pair of inclined portions as the contact surface with the grinding surface of the grindstone, if the table is moved to change the contact point, the detection block does not have to change its posture and has an arc-shaped cross section. Can be brought into contact with three points on the ground surface. For this reason, a mechanism for rotating the detection block is not required, and it is possible to measure the ground surface with high accuracy with a simple structure.
また、検出ブロックの位置及び上端面と凸状としてこ
の部分を平面部とすると共にその両端部に下向き勾配と
した傾斜面とのそれぞれの形状を予め特定されたものと
して制御部の演算系に格納しておくことにより、砥石と
検出ブロックとの相対的な位置関係を予め設定すること
ができる。したがって、これらの平面部と傾斜面とによ
って検出される研削面の３点の位置の関係に基づいて算
出される中心位置及び外径の大きさを、たとえば予め演
算系に格納した砥石の研削面が真円のときの中心位置や
外径と比較演算することによって研削面の形状を判定す
ることができる。Further, the position and the upper end surface of the detection block are made convex and this portion is made into a flat surface portion, and the respective shapes of the inclined surfaces having a downward slope at both end portions are stored in the arithmetic system of the control portion as pre-specified. By doing so, the relative positional relationship between the grindstone and the detection block can be set in advance. Therefore, the center position and the size of the outer diameter calculated based on the relationship between the three positions of the grinding surface detected by the flat surface portion and the inclined surface, for example, the grinding surface of the grindstone stored in advance in the arithmetic system. The shape of the ground surface can be determined by performing a comparison calculation with the center position and outer diameter when is a perfect circle.
第１図は本考案の測定装置を備えたNC制御の研削盤の
正面図、第２図は側面図、第３図は測定装置部分の平面
図である。FIG. 1 is a front view of an NC-controlled grinding machine equipped with the measuring device of the present invention, FIG. 2 is a side view, and FIG. 3 is a plan view of the measuring device portion.
図において、研削盤は従来構造のものと同様にベース
20,サドル21及びテーブル22を備え、テーブル22の上に
はワークを保持固定するための治具23が配置されてい
る。サドル21は第１図において矢印方向へ往復動作し、
またテーブル22は第２図において矢印方向へ往復動作
し、これらの動作の合成によってテーブル22は二次元の
平面運動を行なう。In the figure, the grinder is the same base as the conventional one.
20, a saddle 21 and a table 22 are provided, and a jig 23 for holding and fixing the work is arranged on the table 22. The saddle 21 reciprocates in the direction of the arrow in FIG.
The table 22 reciprocates in the direction of the arrow in FIG. 2, and the combination of these operations causes the table 22 to make a two-dimensional plane motion.
砥石10はベース20から立ち上げて固定したコラム（図
示せず）に上下方向のみ移動可能に支持され、その回転
軸線はサドル21の移動方向に平行であってテーブル22の
移動方向と直交している。そして、この砥石10の研削面
を測定する測定装置１が治具23から離れたベース22の一
端に配置されている。なお、24は測定装置１方向へ空気
を噴出するブロワーであり、測定中も回転を続けたまま
の砥石10を検出ブロック３に接触させるときの研磨粉を
除去するのに利用する。The grindstone 10 is supported by a column (not shown) that is raised from the base 20 and fixed so as to be movable only in the vertical direction, and its rotation axis is parallel to the moving direction of the saddle 21 and orthogonal to the moving direction of the table 22. There is. The measuring device 1 for measuring the grinding surface of the grindstone 10 is arranged at one end of the base 22 separated from the jig 23. A blower 24 blows air toward the measuring device 1 and is used to remove the polishing powder when the grindstone 10 kept rotating during the measurement is brought into contact with the detection block 3.
測定装置１は、圧電素子を利用して信号を出力する検
出器２と砥石10に接触する検出ブロック３とから構成さ
れたものである。検出器２は、検出ブロック３が砥石10
に接触するときの振動によって圧電素子が感応し、NC研
削盤の制御部に信号を入力する。また、検出ブロック３
は第１図に示すように砥石10に接触する側に平面部3a及
びその両側に傾斜部3b,3cを形成したものである。この
傾斜部3bの傾き及び表面形状は高い精度の値を持たせて
形成し、この傾きを予め設定しておくことで砥石10の先
端部の円弧の半径及び中心位置を算出する。The measuring device 1 is composed of a detector 2 that outputs a signal using a piezoelectric element and a detection block 3 that contacts the grindstone 10. In the detector 2, the detection block 3 has a grindstone 10
The piezoelectric element responds to the vibration when it comes into contact with, and inputs a signal to the control section of the NC grinder. Also, the detection block 3
As shown in FIG. 1, the flat portion 3a is formed on the side contacting the grindstone 10 and the inclined portions 3b, 3c are formed on both sides thereof. The inclination and the surface shape of the inclined portion 3b are formed with a high precision value, and the radius and center position of the arc of the tip of the grindstone 10 are calculated by presetting this inclination.
以上の構成において、砥石10の研削面の測定は研削加
工中において一定時間毎または砥石10の累計回転数毎等
を基準にして定期的に行なう。その要領は、テーブル22
を第２図において左側へ移動させ、テーブル22に対して
絶対静止している砥石10に対して測定装置１を測定位置
に設定する。なお、測定の間でも砥石10は回転している
ままである。そして、検出ブロック３に対して、砥石10
の先端の円弧部10aが傾斜部3b,平面部3a及び傾斜部3cの
順に接触するようにサドル21を動かすことによって砥石
10の軸線方向にテーブル22の位置を変える。これらの３
点での接触位置によって求めた値をNC研削盤の制御によ
って演算して砥石10の位置の補正量を算出する。In the above-described configuration, the grinding surface of the grindstone 10 is measured periodically during the grinding process on a regular basis or on the basis of the cumulative number of revolutions of the grindstone 10, or the like. The point is Table 22
2 is moved to the left side in FIG. 2, and the measuring device 1 is set at the measuring position with respect to the grindstone 10 which is absolutely stationary with respect to the table 22. The grindstone 10 is still rotating during the measurement. Then, for the detection block 3, the grindstone 10
By moving the saddle 21 so that the arcuate portion 10a at the tip of the contact the inclined portion 3b, the flat surface portion 3a and the inclined portion 3c in this order,
Change the position of the table 22 in the axial direction of 10. These three
The value obtained from the contact position at the point is calculated by the control of the NC grinder to calculate the correction amount of the position of the grindstone 10.
この測定では、まず第４図（ａ）のように傾斜部3bが
砥石10の下にくるように設定した後コラムの機構を利用
して砥石10を下降させる。この操作により、検出ブロッ
ク３の傾斜部3bの所定の位置に砥石10の円弧部10aが接
触し、この時の振動によって検出器２から信号を出力す
る。この信号は、NC研削盤の制御部に入力され測定前の
基準のテーブル22の位置及び砥石10の軸心の高さに対す
る移動後の検出ブロック３の位置及び砥石10の軸心の位
置の座標が読み取られる。更に、同じ要領で第４図
（ｂ）及び（ｃ）に示すように平面部3a及び他方の傾斜
部3cに砥石10の円弧部10aを接触させて、同様なテーブ
ル22の位置及び砥石10の軸心の高さの座標をNC研削盤の
制御部に読み取らせる。In this measurement, first, as shown in FIG. 4 (a), the inclined portion 3b is set so as to be below the grindstone 10, and then the grindstone 10 is lowered by using the mechanism of the column. By this operation, the circular arc portion 10a of the grindstone 10 comes into contact with a predetermined position of the inclined portion 3b of the detection block 3, and the detector 2 outputs a signal due to the vibration at this time. This signal is input to the control unit of the NC grinder and the coordinates of the position of the reference table 22 before measurement and the position of the detection block 3 and the position of the axis of the grindstone 10 after the movement with respect to the height of the axis of the grindstone 10. Is read. Further, in the same manner, as shown in FIGS. 4 (b) and 4 (c), the arcuate portion 10a of the grindstone 10 is brought into contact with the flat surface portion 3a and the other inclined portion 3c, and the similar position of the table 22 and the grindstone 10 are moved. Have the controller of the NC grinder read the coordinate of the height of the shaft center.
このような３点での接触位置と傾斜部3b,3cの傾斜角
度とから、砥石10の円弧部10aが真円状に成形されてい
るとしたときの円弧部10aの半径とその中心点位置とが
制御部での演算によって算出される。そして、算出され
た円弧部10aの半径と中心点位置の目標値からのずれ
は、NC研削盤の制御部によって算出される。これによ
り、再び研削を開始するときに、砥石10の上下方向及び
前後方向の位置の設定が補正され、砥石10がその研削面
を適正にワークに対して接触させる状態に設定される。Based on the contact positions at these three points and the inclination angles of the inclined portions 3b and 3c, the radius of the arc portion 10a and its center point position when the arc portion 10a of the grindstone 10 is formed into a perfect circle shape And are calculated by calculation in the control unit. The calculated radius of the arc portion 10a and the deviation of the center point position from the target value are calculated by the control unit of the NC grinder. As a result, when the grinding is started again, the setting of the position of the grindstone 10 in the up-down direction and the front-rear direction is corrected, and the grindstone 10 is set in a state in which its grinding surface appropriately contacts the workpiece.
なお、測定の度に検出ブロック３の平面部3a及び傾斜
部3b,3cは、砥石10によって研削されるので、１回の測
定毎に接触点が異なるようにサドル21の動きを制御する
ことが好ましい。また、円弧状断面の研削面を持つ砥石
だけでなく、たとえば検出ブロック３の平面部3aを利用
すれば、周面を平坦な研削面とした砥石の測定も可能で
ある。Since the flat surface portion 3a and the inclined portions 3b and 3c of the detection block 3 are ground by the grindstone 10 at each measurement, the movement of the saddle 21 can be controlled so that the contact point is different for each measurement. preferable. Further, not only a grindstone having a ground surface having an arcuate cross section, but also a flat surface 3a of the detection block 3 can be used to measure a grindstone whose peripheral surface is a flat ground surface.
本考案では、砥石の円弧状断面の研削面の異なる３点
に接触させる検出ブロックに平面部と一対の傾斜部を持
たせ、これらをそれぞれ研削面に接触させることで研削
面の形状を測定できる。このため、検出ブロックの姿勢
を変えて異なる３点で研削面に接触させる機構が不要と
なり、簡単な構造の測定装置が得られる。そして、検出
ブロックを動かす機構を含まないので測定装置自体の組
立精度も高くなり、温度等の条件に対しても精度が劣化
することもなく、常に精度の高い研削面の測定が行え
る。According to the present invention, the detection block that comes into contact with three different points on the grinding surface of the arcuate section of the grindstone has a flat surface portion and a pair of inclined portions, and the shape of the grinding surface can be measured by bringing these into contact with the grinding surface. . Therefore, a mechanism for changing the posture of the detection block and contacting the grinding surface at three different points is unnecessary, and a measuring device having a simple structure can be obtained. Further, since the mechanism for moving the detection block is not included, the assembling accuracy of the measuring apparatus itself is increased, and the accuracy is not deteriorated even under the conditions such as temperature, and the grinding surface can be always measured with high accuracy.
第１図は本考案の測定装置を備えたNC研削盤の正面図、
第２図は側面図、第３図は測定装置部分の平面図、第４
図は検出ブロックによる測定要領を示す図である。 1:測定装置、2:検出器、3:検出ブロック 3a:平面部、3b,3c:傾斜部 10:砥石、10a:円弧部、20:ベース 21:サドル、22:テーブル、23:治具 24:ブロワーFIG. 1 is a front view of an NC grinder equipped with the measuring device of the present invention,
FIG. 2 is a side view, FIG. 3 is a plan view of the measuring device portion, and FIG.
The figure is a diagram showing a measurement procedure by the detection block. 1: Measuring device, 2: Detector, 3: Detection block 3a: Flat part, 3b, 3c: Inclined part 10: Grindstone, 10a: Arc part, 20: Base 21: Saddle, 22: Table, 23: Jig 24 : Blower
Claims (1)
弧状の断面形状に成形した砥石に対して前記研削面の形
状を、円弧面の異なる３点の位置を検出して前記砥石の
研削面の中心と半径の大きさを演算することによって測
定する測定装置であって、 前記測定装置は前記砥石の円弧状の研削面に接触する検
出ブロックと、該検出ブロックが受ける振動を検知して
前記演算を実行する制御部に信号を入力する検出器とを
備え、 前記検出ブロックは、前記研削面の先端部に接触する平
面部を上端に凸となるように形成すると共に、該平面部
の両側から下向きの勾配を持ち前記研削面の先端部から
離れた２点にそれぞれ接触する傾斜部とを備え、 これらの平面部及び傾斜部のそれぞれの形状及び前記検
出ブロックの位置を予め既知として前記制御部の演算系
に格納し、 前記平面部及び左右の傾斜部のそれぞれによって前記研
削面の軸線と直交する平面で切ったときの該研削面の異
なる３点の位置の検出によりその外径及び中心位置を前
記制御部によって演算可能としたことを特徴とする研削
盤の砥石測定装置。1. A grinder provided on a table of a grinder, the grinding surface of which is formed into an arcuate cross-sectional shape, the shape of the grinding surface, and the position of three different arc surfaces is detected to detect the position of the grindstone. A measuring device that measures by calculating the size of the center and radius of the grinding surface, wherein the measuring device detects a detection block that contacts the arc-shaped grinding surface of the grindstone, and detects the vibration received by the detection block. And a detector for inputting a signal to a control unit for executing the calculation, wherein the detection block is formed so that a flat surface portion in contact with a tip portion of the grinding surface is convex at an upper end, and the flat surface portion is formed. Slanted portions having a downward slope from both sides of the slanted surface and contacting two points distant from the tip of the grinding surface, respectively, and the shapes of the flat surface portion and the slanted portion and the position of the detection block are known in advance. Control The outer diameter and the central position of the grinding surface are detected by detecting the positions of three different points on the grinding surface when the cutting surface is cut by a plane orthogonal to the axis of the grinding surface by each of the flat surface portion and the left and right inclined portions. A grindstone measuring device for a grinding machine, characterized in that the control unit can calculate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990112202U JP2507042Y2 (en) | 1990-10-25 | 1990-10-25 | Grinding wheel measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990112202U JP2507042Y2 (en) | 1990-10-25 | 1990-10-25 | Grinding wheel measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0470462U JPH0470462U (en) | 1992-06-22 |
| JP2507042Y2 true JP2507042Y2 (en) | 1996-08-14 |
Family
ID=31859704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990112202U Expired - Lifetime JP2507042Y2 (en) | 1990-10-25 | 1990-10-25 | Grinding wheel measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2507042Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08318462A (en) * | 1995-05-19 | 1996-12-03 | Waida Seisakusho:Kk | Grinding wheel measuring device and method thereof |
| JPH0929628A (en) * | 1995-07-18 | 1997-02-04 | Amada Washino Co Ltd | Measuring method and device for shape of grinding wheel of grinding device, and machining method using the method |
| JP6883966B2 (en) * | 2016-09-29 | 2021-06-09 | 三井精機工業株式会社 | Method of estimating the diameter of the grindstone and the machine tool using it |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5034278A (en) * | 1973-07-27 | 1975-04-02 | ||
| JPS62157773A (en) * | 1986-01-04 | 1987-07-13 | Waida Seisakusho:Kk | Device and method for measurement for grindstone |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58167407U (en) * | 1982-05-04 | 1983-11-08 | 大日本印刷株式会社 | Cylindrical diameter measuring device |
| JPH01162601U (en) * | 1988-04-28 | 1989-11-13 |
-
1990
- 1990-10-25 JP JP1990112202U patent/JP2507042Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5034278A (en) * | 1973-07-27 | 1975-04-02 | ||
| JPS62157773A (en) * | 1986-01-04 | 1987-07-13 | Waida Seisakusho:Kk | Device and method for measurement for grindstone |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0470462U (en) | 1992-06-22 |
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