EP0485597A1 - Schaber - Google Patents
Schaber Download PDFInfo
- Publication number
- EP0485597A1 EP0485597A1 EP90907435A EP90907435A EP0485597A1 EP 0485597 A1 EP0485597 A1 EP 0485597A1 EP 90907435 A EP90907435 A EP 90907435A EP 90907435 A EP90907435 A EP 90907435A EP 0485597 A1 EP0485597 A1 EP 0485597A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- reinforcing plate
- support members
- blade holder
- doctor
- 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
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
Definitions
- This invention relates to a structure for supporting a doctor blade used for permitting a raw material to be satisfactorily accumulated on a paper making roll and water to be satisfactorily fed to the roll and removing foreign matters adhered to a surface of the roll such as paper powders, pitch, tailings or the like from the roll to keep it clean, and more particularly to a doctor blade supporting structure adapted to permit a pressure distributed at an edge of the blade pressedly contacted with the roll to be adjusted so as to be substantially uniform.
- a conventional doctor blade supporting structure which has been known in the art includes an adjusting means which acts to permit a blade for peeling off dusts adhered to a surface of a roll from the roll to be contacted at a tip end thereof with the roll surface at a uniform linear pressure or a contact pressure of the blade uniformly distributed in an axial direction of the roll.
- a blade for a doctor blade supporting structure is required to exhibit satisfactory holding force, stability and flexibility; therefore, the blade for the conventional doctor blade supporting structure is generally made of a relatively thin sheet material such as metal, plastic or the like into any desired thickness depending upon applications thereof.
- a relatively thin sheet material such as metal, plastic or the like into any desired thickness depending upon applications thereof.
- this causes the blade to be pivotally moved with respect to the roll, resulting in the contact pressure of the blade being apt to be varied.
- a structure as shown in Fig. 7 is proposed and used, wherein a blade (G) is vertically interposed between a blade holder (F) made of a relatively rigid plate material and support members (C) and the blade holder (F) keeps the blade (G) at a posture.
- the support members (C) each are held directly on a doctor bag (E) using a screw means or pivotally supported on a pivot rod (D). Then, the blade (G) is vertically moved through a pressurized air tube (A) and an open tube (B) each interposedly arranged between the doctor bag (E) and the support member (C) to adjust a position of the blade (G).
- the blade holder (F) comprises a single plate member formed into a shape of continuously extending in an axial direction of a roll, to thereby prevent a contact pressure of the blade (G) with respect to the roll from being varied in use.
- a contact pressure of the blade (G) with respect to the roll from being varied in use.
- it is necessary to uniformly adjust contact between a surface of the roll and the blade (G).
- this needs a considerable amount of labor.
- a width of the blade holder (F) is finished by machining, however, a thickness of a blank for the blade holder (F) and its length are used as those of the holder (F) without being subject to finishing by machining, resulting in failing to form a contact end between the blade holder (F) and the blade (G) with high accuracy.
- the present situation is to escape an error occurring at the contact end utilizing crook of the blade holder (F); however, in order to accomplish the purpose, it is required to reduce a degree of crook of the blade holder (F) when the doctor blade supporting structure is directed to applications wherein the blade (G) is abutted against the roll at a high pressure, resulting in a relief being lost.
- This requires to further increase the accuracy of the contact end, so that it is highly difficult to press the blade against the roll at a constant linear pressure.
- a doctor blade supporting structure which comprises a blade (1) abutted against a roll (R), a blade holder (2) and support members (4), wherein the blade is mounted on the support members through the blade holder by means of mounting screws (3).
- the structure is characterized in that a reinforcing plate (5) is arranged in a manner to be superposed on the blades holder (2); and finely adjusting screws (10) are arranged so as to permit a gap to be defined between the blade holder (2) and the reinforcing plate (5) or support members (4) so that the blade holder (2) may be approachable or accessible to the blade (1) through a free end (51) of the reinforcing plate (5) defined on the side of the blade.
- Such construction of the present invention permits the structure to effectively absorb strain of each of the roll (R) and blade (1) occurring during operation of the structure while contacting the blade (1) with the roll (R), so that a linear pressure of the blade with respect to the roll (R) may be automatically corrected so as to be uniform over a whole width of the blade.
- the structure of the present invention is so constructed that the blade holder (2) is pressedly fixed by the reinforcing plate (5) on which the blade holder (2) is mounted by means of the mounting screws (3) and the finely adjusting screws (10) are arranged so as to permit the gap to be defined between the blade holder (2) and the reinforcing plate (5) or support members (4) so as to render the blade holder (2) approachable or accessible to the blade (1) through the free end (51) of the reinforcing plate (5) positioned on the side of the blade.
- each of the finely adjusting screws (10) causes a tip end of the blade (1) to be lowered and pressedly abutted against the roll, whereas loosening of the screw causes pressing force of the blade (1) against the roll to be reduced; thus, adjustment of the pressing force is highly facilitated to satisfactorily increase holding force and stability of the blade, to thereby permit the blade to be uniformly pressed against the roll at a constant linear pressure.
- the above-described construction permits the crook of the blade holder in a direction of a thickness thereof to be reinforced, so that the blade holder (2) itself may be formed into a reduced thickness as compared with the prior art. This results in distortion and bending of the blade in a longitudinal direction thereof permitting the blade to exhibit improved response performance or characteristics.
- the present invention keeps the blade (1) at a satisfactory posture while eliminating a necessity of subjecting the reinforcing plate (5) to fine processing and permits the blade holder (2) to prevent the contact pressure of the blade 11) from being varied because the blade (1) is uniformly abutted against a surface of the roll. Also, the present invention permits the contact pressure of the blade with respect to the surface of the roll to be uniformly distributed in an axial direction of the roll and also permits the reinforcing plate (5) to be formed into a reduced thickness.
- FIGs. 1 to 2 illustrate an embodiment of a doctor blade supporting structure according to the present invention.
- a doctor blade supporting structure of the illustrated embodiment includes a blade 1 adapted to be abutted against a roll R, which blade is mounted on support members 4 by means of mounting screws 3 provided for assembling a blade holder 2.
- the doctor blade supporting structure also includes a reinforcing plate 5 arranged in a manner to be laminated or superposed on the blade holder 2.
- the structure includes finely adjusting screws 10 each of which acts to permit a gap to be defined between the blade holder 2 and the reinforcing plate 5 or each of the support members 4 so that the blade holder 2 may be moved through a free end 51 of the reinforcing plate 5 defined on the side of the blade 1 so as to be approachable or accessible to the blade 1.
- the blade 1 is firmly held on the support members 4.
- the reinforcing plate 5 as shown in Fig. 2, comprises a plurality of rectangular plate elements arranged on the blade holder 2 in a manner to be spaced at intervals. It is preferable that the plate elements of the reinforcing plate 5 are separately fixedly held on the support members 4 by means of the mounting screws 3, respectively. Such arrangement effectively prevents distortion and bending actions of the blade 1 in a longitudinal direction thereof from being deteriorated, to thereby substantially improve responsibility of the blade in the longitudinal direction.
- the blade 1 when the blade 1 is pivotally arranged through a support shaft 8 and held on the support members 4 each mounted through air tubes 6 on a doctor bag 7, it is preferable that the plate elements of the reinforcing plate 5 formed into the same width as the support members 4 are fixed together with the blade holder 2 by means of the mounting screws 3.
- the finely adjusting screws 10 are threadedly arranged in threaded holes 9 formed through the reinforcing plate 5 in a manner to be movable in an axial direction thereof in the holes 9 and then inserted into through-holes formed via the blade holder 2 so as to be abutted against the support members 4, so that threaded insertion of the finely adjusting screws 10 through the reinforcing plate 5 permits the other end of each of the plate elements of the reinforcing plate 5 to be approachable or accessible to the blade holder 2 to form a gap therebetween.
- finely adjusting screws 10 inserted in through-holes formed via a blade holder 2 each are tapped with respect to a support member 4 and abutted at a head portion thereof against a lower surface of a reinforcing plate 5.
- the reinforcing plate 5 is formed with holes 101 each of which permits a hexagon wrench to operatively engage therethrough with the head portion of the finely adjusting screw 10 to vertically move it, to thereby cause the other end of the reinforcing plate 5 to be vertically moved to define a gap between the reinforcing plate 5 and the blade holder 2, so that a posture of contact of a blade 1 with respect to a roll R may be adjusted.
- At least one of the mounting screws 3 may be kept somewhat loosened when the adjustment is carried out, to thereby facilitate operation for the adjustment.
- the plate elements of the reinforcing plate 5 each may be formed with a hole 11 for receiving the mounting screw therein as shown in Figs. 1 and 3.
- the reinforcing plate 5 comprises a single plate member of a pectinate or rugged shape so that a free end 51 of the reinforcing plate may be provided with a plurality of projections.
- Such construction of the reinforcing plate 5 facilitates assembling, mounting and handling of the reinforcing plate 5.
- a gap 12 between a support member 4 and a portion of a blade holder 2 overlapped with a reinforcing plate 5 and positioned around a mounting screw 3 arranged on the side of a blade 1 is formed a gap 12, so that threaded insertion of the mounting screw 3 into the support member 4 permits the reinforcing plate 5 and blade holder 2 to be moved together, to thereby vertically adjustably move an end of a blade 1 which is contacted with a roll R.
- the mounting screws 3 each function also as a finely adjusting screw.
- air tubes 6 and 6 are arranged below an extension line C1 defined by extending a line defined between an edge of a blade 1 and a portion of the blade 1 held on support members 4. Also, the air tubes 6 are arranged opposite to each other in a V-like or Y-like manner about an intersection between a line C2 extending from the edge of the blade 1 at an angle ⁇ of 6 to 30 degrees and preferably 10 to 15 degrees below the extension line C1 and a vertical line C3.
- Such construction permits a contact angle of the blade with respect to a roll R to be increased, to thereby decrease a variation of the contact angle due to wearing of the blade 1, resulting in facilitating adjustment of a contact pressure of the blade with respect to the roll R and removal of any tailings from the roll R. Also, such construction permits the blade 1 to be uniformly pressed against the roll R.
- the present invention is so constructed that the reinforcing plate is arranged in a manner to be superposed on the blade holder and the finely adjusting screws each are arranged so as to permit a gap to be defined between the blade holder and the reinforcing plate or support member, resulting in the blade holder being approachable or accessible to the blade through the free end of the reinforcing plate defined on the side of the blade.
- Such construction provides a relief for fine adjustment without requiring to form the contact end of the blade holder with high accuracy. Also, it permits crook of the blade holder to be reduced during pressing of the blade against the roll, to thereby keep the blade at a natural posture.
- the blade permits the blade to be significantly reinforced against the crook of the blade holder while exhibiting a function of pressing the roll at a predetermined line pressure, so that the blade holder may be formed into a reduced thickness as compared with the prior art.
- crook of the blade holder in a radial direction of the roll can be reduced to substantially improve response performance or characteristics of the blade in the longitudinal direction and a doctor line pressure can be rendered uniform over a whole width of the roll, so that the doctor blade supporting structure of the present invention is widely and readily applicable to existing apparatus while ensuring positive operation of the blade at a low cost and permitting the blade to positively exhibit satisfactory holding force, stability and flexibility.
- the present invention can be highly effectively available as a doctor blade supporting structure for a paper making roll.
Landscapes
- Paper (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1990/000611 WO1991018147A1 (fr) | 1990-05-15 | 1990-05-15 | Structure de soutien de couteau nettoyeur |
CA002064211A CA2064211C (en) | 1990-05-15 | 1990-05-15 | Doctor blade supporting structure |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0485597A1 true EP0485597A1 (de) | 1992-05-20 |
EP0485597A4 EP0485597A4 (en) | 1992-10-21 |
EP0485597B1 EP0485597B1 (de) | 1996-09-25 |
Family
ID=4149501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90907435A Expired - Lifetime EP0485597B1 (de) | 1990-05-15 | 1990-05-15 | Schaber |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0485597B1 (de) |
DE (1) | DE69028707D1 (de) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999032717A1 (en) * | 1997-12-22 | 1999-07-01 | Thermo Web Systems, Inc. | Removable doctor blade holder |
WO1999037856A1 (en) * | 1998-01-27 | 1999-07-29 | Thermo Web Systems, Inc. | Fluid assisted doctor |
WO2000046446A1 (en) * | 1999-02-03 | 2000-08-10 | Metso Paper, Inc. | Doctor equipment in connection with a roll/cylinder in a paper/board machine |
US6312563B1 (en) | 1997-12-22 | 2001-11-06 | Thermo Web Systems, Inc. | Removable doctor blade holder |
EP1186703A2 (de) * | 2000-08-25 | 2002-03-13 | Voith Paper Patent GmbH | Schaberanordnung |
EP1947239A2 (de) * | 2006-11-23 | 2008-07-23 | Klaus Bartelmuss | Einrichtung zur lösbaren Befestigung eines Halters für eine Schaberklinge in einer Papiererzeugungsanlage |
US7867364B2 (en) | 2006-08-16 | 2011-01-11 | Kadant Inc. | Doctor blade holder permitting efficient assembly of doctor assemblies and replacement of doctor blades |
US8321992B2 (en) | 2007-12-06 | 2012-12-04 | Kadant Web Systems, Inc. | Integrated doctor blade holders |
CN107287970A (zh) * | 2016-04-12 | 2017-10-24 | 河北永新纸业有限公司 | 一种纸毛及胶粘物刮除装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB368472A (en) * | 1931-01-28 | 1932-03-10 | Rice Barton & Fales Inc | Improvements relating to doctors for paper making and like machines |
US2477339A (en) * | 1945-02-14 | 1949-07-26 | Lodding Engineering Corp | Doctor mechanism for rolls and cylinders |
US3085275A (en) * | 1961-04-12 | 1963-04-16 | Thomas K Allison | Doctor blade and holder |
GB990670A (en) * | 1963-12-13 | 1965-04-28 | Lodding Engineering Corp | Adjustable doctor blade holder |
DE1635384A1 (de) * | 1966-08-08 | 1971-03-11 | Dornbusch & Co | Rakeleinrichtung,insbesondere fuer Tiefdruckmaschinen zum Bedrucken von durchlaufenden Warenbahnen |
GB1419616A (en) * | 1971-11-10 | 1975-12-31 | Ross Ltd James | Blade seat for an adjustable doctor blade mounting |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2019582A1 (en) * | 1968-10-01 | 1970-07-03 | Vickerys Ltd | Holder with adjustable pressure across sec - tions of doctor blade |
-
1990
- 1990-05-15 DE DE69028707T patent/DE69028707D1/de not_active Expired - Lifetime
- 1990-05-15 EP EP90907435A patent/EP0485597B1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB368472A (en) * | 1931-01-28 | 1932-03-10 | Rice Barton & Fales Inc | Improvements relating to doctors for paper making and like machines |
US2477339A (en) * | 1945-02-14 | 1949-07-26 | Lodding Engineering Corp | Doctor mechanism for rolls and cylinders |
US3085275A (en) * | 1961-04-12 | 1963-04-16 | Thomas K Allison | Doctor blade and holder |
GB990670A (en) * | 1963-12-13 | 1965-04-28 | Lodding Engineering Corp | Adjustable doctor blade holder |
DE1635384A1 (de) * | 1966-08-08 | 1971-03-11 | Dornbusch & Co | Rakeleinrichtung,insbesondere fuer Tiefdruckmaschinen zum Bedrucken von durchlaufenden Warenbahnen |
GB1419616A (en) * | 1971-11-10 | 1975-12-31 | Ross Ltd James | Blade seat for an adjustable doctor blade mounting |
Non-Patent Citations (1)
Title |
---|
See also references of WO9118147A1 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5980692A (en) * | 1997-12-22 | 1999-11-09 | Thermo Web Systems, Inc. | Removable doctor blade holder |
US6312563B1 (en) | 1997-12-22 | 2001-11-06 | Thermo Web Systems, Inc. | Removable doctor blade holder |
WO1999032717A1 (en) * | 1997-12-22 | 1999-07-01 | Thermo Web Systems, Inc. | Removable doctor blade holder |
WO1999037856A1 (en) * | 1998-01-27 | 1999-07-29 | Thermo Web Systems, Inc. | Fluid assisted doctor |
US6139638A (en) * | 1998-01-27 | 2000-10-31 | Thermo Web Systems, Inc. | Fluid assisted doctor |
US6547932B1 (en) | 1999-02-03 | 2003-04-15 | Metso Paper, Inc. | Doctor equipment in connection with a roll/cylinder in a paper/board machine |
WO2000046446A1 (en) * | 1999-02-03 | 2000-08-10 | Metso Paper, Inc. | Doctor equipment in connection with a roll/cylinder in a paper/board machine |
EP1186703A2 (de) * | 2000-08-25 | 2002-03-13 | Voith Paper Patent GmbH | Schaberanordnung |
EP1186703A3 (de) * | 2000-08-25 | 2002-09-18 | Voith Paper Patent GmbH | Schaberanordnung |
US7867364B2 (en) | 2006-08-16 | 2011-01-11 | Kadant Inc. | Doctor blade holder permitting efficient assembly of doctor assemblies and replacement of doctor blades |
EP1947239A2 (de) * | 2006-11-23 | 2008-07-23 | Klaus Bartelmuss | Einrichtung zur lösbaren Befestigung eines Halters für eine Schaberklinge in einer Papiererzeugungsanlage |
EP1947239A3 (de) * | 2006-11-23 | 2009-06-03 | Klaus Bartelmuss | Einrichtung zur lösbaren Befestigung eines Halters für eine Schaberklinge in einer Papiererzeugungsanlage |
US8321992B2 (en) | 2007-12-06 | 2012-12-04 | Kadant Web Systems, Inc. | Integrated doctor blade holders |
CN107287970A (zh) * | 2016-04-12 | 2017-10-24 | 河北永新纸业有限公司 | 一种纸毛及胶粘物刮除装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0485597B1 (de) | 1996-09-25 |
EP0485597A4 (en) | 1992-10-21 |
DE69028707D1 (de) | 1996-10-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5279710A (en) | Doctor blade supporting structure | |
EP0485597B1 (de) | Schaber | |
US5048005A (en) | Spindle clamp having a unitary lock member | |
JPS59178253A (ja) | 印刷機の胴洗浄装置のためのドクタ | |
US4880672A (en) | Method and apparatus for bladecoating of a moving web | |
US3986379A (en) | Die pad assembly | |
US2704026A (en) | Doctor blade and mounting for rotogravure printing machines | |
US4569155A (en) | Grinding machine and method for flat, board-shaped workpieces | |
JPH08506758A (ja) | 調整可能なブレードを備えたコーティング装置 | |
JPS6320411Y2 (de) | ||
JP2618014B2 (ja) | 固形物質の掻取り装置 | |
JPS636349B2 (de) | ||
JPS55159987A (en) | Adjusting mechanism for pressing device of recording head | |
US4543867A (en) | Slitter knife holder | |
EP0089644B1 (de) | Mikrotom | |
US6139635A (en) | Backing bar for coat weight control system | |
JPH10328886A (ja) | 薄板シートの加工用保持装置及び保持方法 | |
US7584772B2 (en) | Method for clamping a knife in a disc chipper and a knife clamp for a knife assembly | |
US5267787A (en) | Screw extruder with feed roller | |
JP2508790Y2 (ja) | ドクタ―ブレ―ド支持装置 | |
US4153992A (en) | Cutting scissors particularly for the cutting of yarns | |
EP0508475A2 (de) | Streckrollen-Richtmaschine | |
US9884430B2 (en) | Side shift force control | |
JPH0242286B2 (de) | ||
JP3475482B2 (ja) | ブレードコータのプロファイル調整装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19920218 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 19920831 |
|
AK | Designated contracting states |
Kind code of ref document: A4 Designated state(s): DE FR GB |
|
17Q | First examination report despatched |
Effective date: 19940614 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960925 |
|
REF | Corresponds to: |
Ref document number: 69028707 Country of ref document: DE Date of ref document: 19961031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19961228 |
|
EN | Fr: translation not filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20020515 Year of fee payment: 13 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030515 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20030515 |