JPH03281160A - Grinding apparatus for plate glass - Google Patents
Grinding apparatus for plate glassInfo
- Publication number
- JPH03281160A JPH03281160A JP23980690A JP23980690A JPH03281160A JP H03281160 A JPH03281160 A JP H03281160A JP 23980690 A JP23980690 A JP 23980690A JP 23980690 A JP23980690 A JP 23980690A JP H03281160 A JPH03281160 A JP H03281160A
- Authority
- JP
- Japan
- Prior art keywords
- drive shaft
- stone
- plate glass
- polishing
- shaped
- 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.)
- Granted
Links
- 239000005357 flat glass Substances 0.000 title claims description 22
- 239000004575 stone Substances 0.000 claims description 37
- 238000005498 polishing Methods 0.000 claims description 23
- 230000002093 peripheral effect Effects 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 13
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は板ガラスの縁部を研磨する装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a device for polishing the edges of glass sheets.
（従来の技術及び発明が解決しようとする課題）実質的
に水平に板ガラスを担持する支持テーブルと、回転軸に
取り付けられ且つ周縁部にＶ字状又はＵ字状の溝を有す
る石うすからなり、この石うすを支持テーブルの面に対
して垂直に移動させて板ガラスを研磨する装置が、例え
ば西独特許公報第２，１２７，２９８号及び同第３，７
０６，８８６号に記載されている。後者の公報に開示さ
れた石うすは、これを駆動するモーターと共に垂直方向
に移動するようになっているため、移動する荷重が大き
くそれだけ機械調整の精度に問題かある。一方、前者の
公報に記載のものは、板ガラスをボール・コト板間に支
持し、これらのコート板を機枠に対し移動調整する構成
をとっているが、この構成も前記同様、機械調整に手間
が掛り面倒である。(Prior Art and Problems to be Solved by the Invention) A support table that supports a plate glass substantially horizontally, and a stone table that is attached to a rotating shaft and has a V-shaped or U-shaped groove on its peripheral edge; A device for polishing plate glass by moving this stone perpendicular to the surface of a support table is disclosed, for example, in West German Patent Publication Nos. 2,127,298 and 3,7.
No. 06,886. Since the stone stone disclosed in the latter publication is designed to move in the vertical direction together with the motor that drives it, the moving load is large, which poses a problem in the accuracy of mechanical adjustment. On the other hand, the one described in the former publication has a structure in which the plate glass is supported between the ball and the coating plate, and these coated plates are moved and adjusted relative to the machine frame, but this structure also does not require mechanical adjustment as described above. It is time-consuming and troublesome.
（課題を解決するための手段）
従って、本発明の目的は、石うすの垂直移動調整を高精
度、高能率を以って行い得る装置を提供することにある
。この目的は特許請求の範囲に記載の構成により達成さ
れる。(Means for Solving the Problems) Therefore, an object of the present invention is to provide an apparatus that can adjust the vertical movement of a stone cabinet with high precision and high efficiency. This object is achieved by the structure described in the claims.
＼
（実施例）
図中、符号（１）は周縁部にＶ字状の研磨溝（２）を有
する石うすを示す。板ガラス（３）又は（４）は垂直、
即ち上下に移動することなく固定された支持テーブル（
５）に担持されている。石うす（１）を垂直方向に偏位
させることにより、研磨溝（２）の対称面を板ガラス（
３）又は（４）の縁部中心線に合致させる。引続き石う
す（１）を水平方向に移動させて、板ガラス（３）又は
（４）の縁部を研磨溝（２）の側面に係合させる。この
状態で石うす（１）を垂直軸を中心に回動させて研磨を
行う。石うす（１）の代りに支持テーブル（５）を水平
方向に移動し、更に回動されるように構成しても良い。\ (Example) In the figure, the reference numeral (1) indicates a stone mortar having a V-shaped polishing groove (2) on the periphery. Plate glass (3) or (4) is vertical;
In other words, the support table is fixed without moving up and down (
5). By vertically displacing the stone bowl (1), the plane of symmetry of the polishing groove (2) is aligned with the plate glass (
Match the edge center line of 3) or (4). Subsequently, the stone mill (1) is moved horizontally so that the edge of the glass pane (3) or (4) engages with the side surface of the polishing groove (2). In this state, polishing is performed by rotating the stone basin (1) around the vertical axis. Instead of the stone counter (1), the support table (5) may be moved in the horizontal direction and may also be configured to be rotated.
石うす（１）が回動すると、板ガラス（３）又は（４）
の鋭利な縁部は対称的に研磨される。この場合、例えば
板ガラス（４）の厚さを２龍、板ガラス（３）の厚みを
２．５ｍｍとする。When the stone bowl (1) rotates, the plate glass (3) or (4)
Sharp edges are symmetrically polished. In this case, for example, the thickness of the glass plate (4) is 2 mm, and the thickness of the glass plate (3) is 2.5 mm.
板ガラスの厚さにより、石うす（１）は垂直方向、即ち
板ガラスの面に直角な方向に上下動する。即ち、板ガラ
スが厚いか薄いかにより、石うす（１）は作動位置（ｎ
）に上昇したり、他の作動位置（Ｉ）に下降するように
なっている。第１図の左側の部分に厚い方の板ガラス（
４）が支持テーブル（５）に担持されており、このテー
ブル（５）は右側のテーブル（５）と同レベルに配され
ている。一つの共通の固定式テーブル（５）を用いて、
２．０ ｍｍと２．５關厚の板ガラスを、交互に自動的
に連続してそれぞれの作動位置（Ｉ）、 （ＩＩ）に
於て研磨できるように構成することもできる。そして、
それぞれの作動位置（１）、 （ＩＩ）に於て、石う
す（１）を所定のレベルに配し、研磨溝（２）を板ガラ
ス（３）又は（４）の縁部に係合させ研磨を行う。この
際の石うす（Ｉ）の上下の偏位は、二つの異る厚みの板
ガラスの厚さの差の部分の−１即ち本実施例の場合０．
２５＋ｕ＋である。Depending on the thickness of the glass sheet, the stone slat (1) moves up and down in the vertical direction, ie perpendicular to the plane of the glass sheet. That is, depending on whether the plate glass is thick or thin, the stone counter (1) will be in the operating position (n
) and lowered to another operating position (I). The thicker plate glass (
4) is carried on a support table (5), which table (5) is arranged on the same level as the right-hand table (5). Using one common fixed table (5),
It can also be configured such that glass sheets with a thickness of 2.0 mm and 2.5 mm can be polished alternately and automatically in succession in the respective operating positions (I) and (II). and,
At the respective operating positions (1) and (II), the stone bowl (1) is placed at a predetermined level, and the polishing groove (2) is engaged with the edge of the glass plate (3) or (4) to perform polishing. conduct. At this time, the vertical deviation of the stone casing (I) is -1 of the difference in thickness between the two glass plates with different thicknesses, that is, 0 in this example.
25+u+.
第２図に示す装置は第１図の場合と同じ構成からなるが
、相違点は石うす（］）にＵ字状の二つの研磨溝（２“
）を設けたことである。小中の溝（２’）は薄い板ガラ
ス（４）を、大巾の溝（２′）は厚い板ガラス（３）を
それぞれ研磨するのに用いる。このように、石うす（１
）の研磨溝（２，２’）はその形状と数に於て種々異る
ものを用いることができる。The device shown in Figure 2 has the same configuration as the one in Figure 1, but the difference is that two U-shaped polishing grooves (2"
). The small and medium grooves (2') are used to polish thin glass plates (4), and the wide grooves (2') are used to polish thick glass plates (3). In this way, stone usu (1
) The polishing grooves (2, 2') can be of various shapes and numbers.
石うす（１）の垂直方向に於ける偏位は、第３図及び第
４図に関し、後述するように石うす（１）とその駆動軸
（７）をのみ移動することにより行う。The displacement of the stone shed (1) in the vertical direction is effected by moving only the stone shed (1) and its drive shaft (7), as will be described later with reference to FIGS. 3 and 4.
石うす（１）は駆動軸（７）の底端部に取り付けられ、
駆動軸（７）はベアリング（９）を介して管状スリーブ
（８）内に回転自在に設けられ、且つ機枠（６）に取り
付けられている。駆動軸（７）と管状スリーブ（８）の
相対回転運動はトルク・ロッド（１０）により伝達され
る。又トルク・ロッド（１０）は駆動軸（７）と石うす
（１）の管状スリーブ（８）に対する軸方向の運動を行
わせる。駆動軸（７）の頂端部は駆動ベル１−（１２）
を介し、駆動モータ（図示せず）により駆動されるベル
ト・プーリ（１１）に接続されている。該頂端部は又、
エア・シリンダー（１４）のピストン・ロッド（１５）
に回動ジヨイント（Ｉ３）を介して係合している。エア
・シリンダー（１４）は、外巻きネジ（１７）により機
枠（６）に取り付けられた椀状部（１６）に嵌合してい
る。椀状部（１６）にはセット・スクリュー（１８）が
設けられ、これにピストンφロッド（１５）の上端部が
当接し、シリンダー（１４）のピストンの上昇運動を制
限するようになっている。The stone basin (1) is attached to the bottom end of the drive shaft (7),
The drive shaft (7) is rotatably provided within the tubular sleeve (8) via a bearing (9) and is attached to the machine frame (6). The relative rotational movement between the drive shaft (7) and the tubular sleeve (8) is transmitted by a torque rod (10). The torque rod (10) also causes axial movement of the drive shaft (7) and the stone shank (1) relative to the tubular sleeve (8). The top end of the drive shaft (7) is the drive bell 1-(12)
is connected to a belt pulley (11) driven by a drive motor (not shown). The top end also has
Piston rod (15) of air cylinder (14)
is engaged through a rotation joint (I3). The air cylinder (14) is fitted into a bowl-shaped part (16) attached to the machine frame (6) by an externally wound screw (17). A set screw (18) is provided in the bowl-shaped portion (16), and the upper end of the piston φ rod (15) comes into contact with this to limit the upward movement of the piston of the cylinder (14). .
本発明の装置により、例えば第１図示の通り、２．０ｍ
ｍと２．５ｍｍ厚の板ガラスをそれぞれ作動位置（Ｉ）
と（ＩＦ）に於て研磨する場合、次の調整作業を行う。With the apparatus of the present invention, for example, as shown in the first figure, 2.0 m
and 2.5 mm thick plate glass in the operating position (I).
When polishing at (IF), perform the following adjustment work.
１）２．０ｍｍ厚の板ガラスの研磨には、石うす（１）
の作動位置（Ｉ）をネジ（１７）により調整する（下部
位置調整）。1) For polishing 2.0mm thick plate glass, use a stone polisher (1)
Adjust the operating position (I) using the screw (17) (lower position adjustment).
２） ２．５ ＋ｎｍ厚の板ガラスの研磨には、石うす
（１）の作動位置（ＩＩ）をスクリュー（１８）により
調整する（上部位置調整）。2) For polishing a plate glass with a thickness of 2.5 + nm, the operating position (II) of the stone washlet (1) is adjusted using the screw (18) (upper position adjustment).
３）エア・シリンダー（１４）により、石うす（１）の
作動位置（Ｉ）から作動位置（ｎ）の移動を行う。作動
位置（１）に於けるシリンダー（Ｉ４）はシリンダー底
部に対して規制され、作動位置（ＩＩ）に於けるピスト
ン・ロッド（１５）はスクリュー（１８）に対して規制
される。3) The air cylinder (14) moves the stone cabinet (1) from the working position (I) to the working position (n). The cylinder (I4) in the working position (1) is restrained against the cylinder bottom, and the piston rod (15) in the working position (II) is restrained against the screw (18).
上述の通り、石うす（１）の上部位置、下部位置の調整
は正確に行われ、この調整が終了すると石うす（１）は
迅速に且つ自動的に作動位置（Ｉ）。As mentioned above, the adjustment of the upper and lower positions of the stone washroom (1) is carried out accurately, and when this adjustment is completed, the stone washroom (1) is quickly and automatically moved to the operating position (I).
（ＩＩ）間に移動される。例えば、一つの研磨溝（２，
２°）を有する石うす（１）の上下位置を調整すること
により、１．５＋ｎＩ］ｌから６＋ｎｍの範囲の厚さの
板ガラスを研磨でき、この場合、石うす（１）の要する
調整の距離は僅か２．２５＋＋＋＋ａであり、このよう
な少ない調整は第３図に示す本発明の装置により可能で
ある。第２図に示す実施例の場合、寸法・形状に多少の
変更を加えることもできる。種々設計変更が考えられる
が、例えば駆動軸（７）への動力の伝達にピニオン等を
用いて、これにより駆動モータに対する駆動軸（ア）の
軸方向の運動を行わせしめてもよい。(II) moved between For example, one polishing groove (2,
By adjusting the vertical position of the stone washlet (1) with an angle of 2°), sheet glass with a thickness in the range of 1.5+nI]l to 6+nm can be polished; in this case, the adjustment distance of the stone washlet (1) is small. 2.25++++a, and such a small adjustment is possible with the device of the invention shown in FIG. In the case of the embodiment shown in FIG. 2, some changes may be made to the dimensions and shape. Although various design changes are possible, for example, a pinion or the like may be used to transmit power to the drive shaft (7), thereby causing the drive shaft (A) to move in the axial direction relative to the drive motor.
４、4,
第１図は異る厚みの板ガラスを研磨する石うすの上下位
置を調整する構成を示す略図的側面図、第２図は異る研
磨溝を有する石うすの上下位置の調整構成を示す略図、
第３図は本発明装置の垂直断面図、第４図は第３図の■
線上の断面図。
■・・・石うす ２・・・研磨溝３．４・・・板
ガラス ５・・・支持テーブル７・・・駆動軸
ＦＩＧ、４FIG. 1 is a schematic side view showing a configuration for adjusting the vertical position of a stone table for polishing plate glass of different thickness; FIG. 2 is a schematic diagram showing a configuration for adjusting the vertical position of a stone table having different polishing grooves;
Figure 3 is a vertical sectional view of the device of the present invention, and Figure 4 is the
Cross-sectional view on the line. ■...Stone bowl 2...Polishing groove 3.4...Plate glass 5...Support table 7...Drive shaft FIG, 4
Claims (1)
（５）と、回転駆動軸（７）と、この駆動軸に取り付け
られ且つ周縁部に一つ又は二つ以上のＶ字状又はＵ字状
研磨溝（２，２′）を有する石うす（１）とからなり、
該石うす（１）を支持テーブル（５）の面に対し垂直運
動を行わせしめる構成に於て、 前記駆動軸（７）を機枠（６）に回動自在に取り付けら
れた管状スリーブ（８）内に軸方向に運動自在に設け、
石うす（１）の反対側の駆動軸（７）の端部を回動ジョ
イント（１３）を介して調整手段（１４−１８）に係合
させて、機枠（６）に対する該駆動軸（７）の軸方向の
位置を調整し得るように構成したことを特徴とする板ガ
ラスの研磨装置。 〔２〕板ガラスを担持する実質的に水平な支持テーブル
（５）と、回転駆動軸（７）と、この駆動軸に取り付け
られ且つ周縁部に一つ又は二つ以上のＶ字状又はＵ字状
研磨溝（２，２′）を有する石うす（１）とからなり、
該石うす（１）を支持テーブル（５）の面に対し垂直運
動を行わせしめる構成に於て、 前記駆動軸（７）を回動ジョイント（１３）を介して調
整手段（１４−１８）に係合させ、機枠（６）に対する
該駆動軸の軸方向の位置を調整すると共に、前記駆動軸
（７）を駆動伝達手段（１１，１２）により固定駆動モ
ーターに接続したことを特徴とする板ガラスの研磨装置
。 〔３〕前記調整手段（１４−１８）がネジ（１７）によ
り軸方向に偏位可能に設けられた椀状部（１６）に嵌合
する駆動シリンダ（１４）を含むことを特徴とする請求
項１項又は２項記載の装置。 〔４〕厚い板ガラス（３）の研磨位置に石うす（１）が
調整されて、この位置に対応する方向に前記シリンダー
（１４）のピストンが偏位し、ピストン・ロッド（１５
）が取り付けられたセット・スクリュー（１８）に前記
椀状部（１６）の底部が嵌合されていることを特徴とす
る請求項３項記載の装置。 〔５〕前記シリンダー（１４）のピストンにより、薄い
板ガラス（４）に対する石うす（１）の研磨位置に対応
する方向に前記駆動軸（７）が移動するのを制限したこ
とを特徴とする請求項３項又は４項記載の装置。[Scope of Claims] [1] A substantially horizontal support table (5) supporting a sheet glass, a rotary drive shaft (7), and one or more rotary shafts attached to the drive shaft and attached to the peripheral edge thereof. It consists of a stone basin (1) having V-shaped or U-shaped polishing grooves (2, 2'),
A tubular sleeve (8) rotatably attached to the machine frame (6) around the drive shaft (7) in a configuration that allows the stone pallet (1) to move perpendicularly to the surface of the support table (5). Provided with free movement in the axial direction,
The end of the drive shaft (7) on the opposite side of the stone counter (1) is engaged with the adjusting means (14-18) via the pivot joint (13) to adjust the drive shaft (7) relative to the machine frame (6). 1. A plate glass polishing apparatus characterized in that the axial position of the plate glass can be adjusted. [2] A substantially horizontal support table (5) that supports a plate glass, a rotary drive shaft (7), and one or more V-shaped or U-shaped parts attached to the drive shaft and attached to the peripheral edge thereof. It consists of a stone basin (1) having shaped polishing grooves (2, 2'),
In a configuration in which the stone pedestal (1) is made to move perpendicularly to the surface of the support table (5), the drive shaft (7) is connected to the adjustment means (14-18) via a rotation joint (13). The plate glass is characterized in that the axial position of the drive shaft with respect to the machine frame (6) is adjusted, and the drive shaft (7) is connected to a fixed drive motor by a drive transmission means (11, 12). polishing equipment. [3] A claim characterized in that the adjustment means (14-18) includes a drive cylinder (14) that fits into a bowl-shaped portion (16) provided so as to be deflectable in the axial direction by a screw (17). The device according to item 1 or 2. [4] The stone machine (1) is adjusted to the polishing position of the thick plate glass (3), the piston of the cylinder (14) is deflected in the direction corresponding to this position, and the piston rod (15
4. Device according to claim 3, characterized in that the bottom of said bowl (16) is fitted into a set screw (18) fitted with a set screw (18). [5] A piston of the cylinder (14) restricts movement of the drive shaft (7) in a direction corresponding to the polishing position of the stone wash (1) with respect to the thin plate glass (4). The device according to item 3 or 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI901573A FI84564C (en) | 1990-03-29 | 1990-03-29 | Device for grinding the edge of a glass slab |
| FI901573 | 1990-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03281160A true JPH03281160A (en) | 1991-12-11 |
| JP2877925B2 JP2877925B2 (en) | 1999-04-05 |
Family
ID=8530150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2239806A Expired - Lifetime JP2877925B2 (en) | 1990-03-29 | 1990-09-10 | Plate glass polishing equipment |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0451333A3 (en) |
| JP (1) | JP2877925B2 (en) |
| FI (1) | FI84564C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100453637B1 (en) * | 2002-07-11 | 2004-10-20 | 남상권 | Before and behind adjuster of grinding shaft used in grinding machine |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT246811Y1 (en) | 1999-06-21 | 2002-04-10 | Bavelloni Z Spa | BILATERAL TANGENTIAL MACHINE FOR THE PROCESSING OF THE EDGES OF GLASS SLABS STONE AND SIMILAR MATERIALS |
| TWI503206B (en) * | 2009-08-27 | 2015-10-11 | Corning Inc | Apparatus and method for precision edge finishing |
| CN107263321B (en) * | 2017-05-12 | 2019-03-22 | 郑州磨料磨具磨削研究所有限公司 | Grinding wheel cylindrical processing method and processing unit (plant) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7425126U (en) * | 1973-08-01 | 1974-10-24 | Bavelloni Z & Figli Sas | Device for the automatic axial adjustment of a rotating tool in a machine for processing glass panes |
| ATE4872T1 (en) * | 1980-02-08 | 1983-10-15 | Officina Meccanica Zanetti Aristodemo & C. S.A.S. | EDGE GRINDING MACHINE FOR PLATE-SHAPED WORKPIECES, ESPECIALLY GLASS OR STONE PLATES. |
| DE3706886A1 (en) * | 1987-03-04 | 1988-09-22 | Bielefelder Union Bruno Koch G | Edge-grinding machine |
-
1990
- 1990-03-29 FI FI901573A patent/FI84564C/en not_active IP Right Cessation
- 1990-09-10 JP JP2239806A patent/JP2877925B2/en not_active Expired - Lifetime
- 1990-11-15 EP EP19900121913 patent/EP0451333A3/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100453637B1 (en) * | 2002-07-11 | 2004-10-20 | 남상권 | Before and behind adjuster of grinding shaft used in grinding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| FI84564C (en) | 1991-12-27 |
| FI901573A (en) | 1991-09-13 |
| FI901573A0 (en) | 1990-03-29 |
| EP0451333A3 (en) | 1992-03-04 |
| JP2877925B2 (en) | 1999-04-05 |
| FI84564B (en) | 1991-09-13 |
| EP0451333A2 (en) | 1991-10-16 |
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