US3788219A - Blade for scraping liquids from a relatively moving surface - Google Patents

Blade for scraping liquids from a relatively moving surface Download PDF

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Publication number
US3788219A
US3788219A US00241003A US3788219DA US3788219A US 3788219 A US3788219 A US 3788219A US 00241003 A US00241003 A US 00241003A US 3788219D A US3788219D A US 3788219DA US 3788219 A US3788219 A US 3788219A
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US
United States
Prior art keywords
blade
scraping
apex
ledge
combination
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
Application number
US00241003A
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English (en)
Inventor
J Gallagher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AB Dick Co
Original Assignee
AB Dick Co
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Filing date
Publication date
Application filed by AB Dick Co filed Critical AB Dick Co
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Publication of US3788219A publication Critical patent/US3788219A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1072—Blade construction

Definitions

  • FIG. 1 is a side elevation of a scraper assembly embodying the present invention adapted to clean the surface of a roller;
  • FIG. 2 is an enlarged section of a surface engaging portion of the scraper assembly of FIG. 1;
  • FIG. 3 is an elevation, partially in section, of the scraper assembly and roller shown in FIG. 1.
  • FIG. 1 thereshown is a scraper assembly selectively operable to bring a surface engaging portion, generally referred to as a blade 11, into engagement with a surface to be cleaned, in the present instance a roller 12.
  • a surface engaging portion generally referred to as a blade 11
  • a roller 12 for a more detailed description of one application of the scraper assembly, reference is made to a co-pending U.S. Pat. application Ser. No. 241,024, filed Apr. 4, 1972 titled: Improved System for Cleaning Rollers ofA Duplicating Machine, Such As The Inking Rollers, assigned to A. B. Dick Company, assignee of the present invention.
  • the blade 11 is constructed so that engagement of the latter with a relatively movable surface 14, such as that of roller 11 covered with a liquid 15, effects substantially complete removal of the liquid from the surface, while minimizing the braking effect applied to the relatively moving members.
  • the blade 11 preferably has a generally triangular cross section (see FIGS. 1 and 2) with a front leg 16 and a rear leg 18, the common ends of the latter being joined at an apex 19 and having individual integral bases or feet 20 and 21 at their respective opposite ends suitably anchored.
  • the legs are preferably shaped to have a generally curved configuration. Accordingly, the exemplary blade is formed with the legs, apex and feet as one integral item.
  • One exemplary curved or convex shape is represented by the outer surfaces 22, 24 respectively of the legs 16 and 18.
  • a scraping edge 26 and a scrapings diverting face 28 are provided at the apex for engaging the surface to be cleaned and to penetrate the liquid layer or coating 15 so as to remove the liquid from the surface and direct the scrapings away.
  • the viscosity of the liquid is in a range so that it readily flows, the scraping edge is self cleaning, and thus all the scrapings are directed away from the scraping edge. It is a feature of the present invention as explained subsequently that the blade is capable of operating so that the edge 26 will not penetrate a liquid having a viscosity greater than that which will flow when scraped.
  • the exemplary embodiment shows a support bar 29 for the blade 11, having a pair of grooves 30, 31, the groove 30 being shaped to captively receive foot 20 and groove 31 being shaped to captively receive the other foot 21.
  • the blade 11 is preferably formed of resilient material such as rubber so that with the bases of the respective legs held captive, a predetermined balance of forces is maintained at the apex 19'.
  • the bar 29 of the blade assembly 11 is carried for pivotable movement (counterclockwise as viewed in FIG. 1) by a set of pivot pins 36, 37.
  • the diverting face 28 must confront the surface to be cleaned against the direction of relative movement. That is, with the blade stationary and the roller rotating, the face 28 confronts the roller against the direction of rotation.
  • the stiffness of both legs 16 and 18 provides the columnar support for the blade ledge 25 to cause the blade edge 26 to penetrate the liquid layer 15 and engage the roller surface.
  • the form and the material selected for the legs is such as to penetrate a liquid layer of predetermined viscosity.
  • a blade providing greater stiffness or resistance at the scraping ledge 25 will penetrate liquids of greater viscosity.
  • the blade was brought into engagement with the surface so that the diverting face 28 was inclined at an angle of approximately 15 off perpendicular at the point of scraping.
  • the orientation of the diverting face to the roller surface must be so selected that the blade edge 26 intimately engages the surface to be cleaned and the scraped contaminants are not transferred back to the roller surface as a wedge when the blade is retracted.
  • the front and rear legs l6, 18 respectively are subjected to compression. While there is a hydrodynamic surface present on the roller as provided by a liquid film, or layer, the coefficient of friction between the blade and roller is relatively low. If the liquid layer has a predetermined viscosity the compression forces and bending forces in the legs will cause the blade edge to penetrate the liquid and start scraping. By selecting the physical properties for the blade as exemplified herein, it is possible to effect scraping only of liquids below a predetermined viscosity.
  • the rear leg is under compression and thereby maintains the blade edge 26 pressed against the surface, while the front leg 16 is under bending forces to assure that the diverting face 28 does not pull away or flex excessively thereby eliminating the scraping effectiveness of the edge 26.
  • the latter is also important to maintain the scraping ledge 25 in uniform contact with the surface to be scraped so that chatter and vibration of the blade is prevented. Accordingly, the blade is protected from being torn-up or disintegrated in high speed operation.
  • the construction of the rear leg 18 including having the front leg surface 22 intersecting the apex 19 below the point at which the rear leg surface 24 intersects the apex provides a support for the edge 26 and diverting face 28 so that the scraping ledge is maintained in predetermined alignment ancl is not allowed to bend or flex back upon itself, which would be completely unsatisfactory.
  • the present invention has another feature in that it is fool proof should the blade be pressed against a relatively moving dry surface.
  • the resistance force under tension provided by the front leg 16 is such as to release the scraping ledge 25 if the friction is too great in the scraping area.
  • the lack of a liquid on the surface provides a relatively high coefficient of friction. Accordingly, in the instance of scraping rollers in an offset duplicator, there would not be applied a braking force that would damage the blade or the drive of the rollers.
  • the base of front leg 16 By having the base of front leg 16 held captive in groove 30 that leg can withstand the tension applied to the leg by the ledge as it scrapes a surface. Also, the groove 31 by holding foot 21 captive assures that the desired lateral spacing between the legs 16, 18 is maintained to assure the advantageous triangular shape for the blade assembly 11.
  • the advantageous spacing between bases 20 and 21 is in the neighborhood of one-fourth of an inch and the leg surface 22 has a contour generated by a radius of one-half of an inch while the leg sur face 24 has a contour generated by a radius of elevensixteenths of an inch.
  • the front leg has a thickness of three sixty-fourths of an inch at a point represented by reference character 38, while the rear leg has a thickness of five sixty-fourths of an inch at a point represented by reference character 39 and the diverting face has a dimension of one thirty-second of an inch.
  • the viscosity of the liquid to be scraped is not critical once it is below a predetermined value. Accordingly, the blade can be operated so that ink is not scraped, while ink cut with solvent is scraped.
  • an exemplary embodiment of the present invention describes scraping rollers, it is understood that this is by way of illustration and the scope of my invention includes scraping other relatively movable surfaces, for example belts.
  • the present invention can be used to scrape liquids other than the exemplary solvent-cut lithographic ink as long as the construction and operation of the blade is such as to penetrate the liquid.
  • an apparatus having a surface carrying a liquid to be removed and a scraper assembly including a surface engaging portion of generally triangular cross section made of flexible material and mounted for relative movement with respect to the surface so as to have an apex of the triangular cross section engageable with the surface to remove the liquid, comprising in combination a scraper ledge at the triangle apex having a scraping edge and a scrapings diverting face; spaced apart front and rear legs joined together at, and sloping back and away from said apex; said diverting face being defined by an outer surface of said front leg intersecting the apex at a point below where an outer surface of said rear leg intersects the same apex; and a base remote from said ledge for supporting said front and rear legs in spaced apart relationship.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Cleaning In General (AREA)
  • Rotary Presses (AREA)
US00241003A 1972-04-04 1972-04-04 Blade for scraping liquids from a relatively moving surface Expired - Lifetime US3788219A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24100372A 1972-04-04 1972-04-04

Publications (1)

Publication Number Publication Date
US3788219A true US3788219A (en) 1974-01-29

Family

ID=22908835

Family Applications (1)

Application Number Title Priority Date Filing Date
US00241003A Expired - Lifetime US3788219A (en) 1972-04-04 1972-04-04 Blade for scraping liquids from a relatively moving surface

Country Status (8)

Country Link
US (1) US3788219A (ja)
JP (1) JPS5129042B2 (ja)
BR (1) BR7302383D0 (ja)
CA (1) CA979286A (ja)
DE (1) DE2316608C3 (ja)
DK (1) DK135031B (ja)
FR (1) FR2179435A5 (ja)
GB (1) GB1399057A (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026648A (en) * 1971-12-17 1977-05-31 Canon Kabushiki Kaisha Cleaning device for use in electrophotographic copying apparatus
US4042415A (en) * 1974-05-28 1977-08-16 Xerox Corporation Method for scraping liquids from a moving surface
US5524540A (en) * 1994-12-15 1996-06-11 Van Denend; Mark E. Printing press having doctor blade with integral tape seal thereon
US5685221A (en) * 1995-01-12 1997-11-11 Stretch Devices, Inc. Flood bar for screen printing
WO1997047473A1 (en) * 1996-06-10 1997-12-18 Stretch Devices, Inc. Adjustable flexibility squeegee with replaceable contact blade

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4880053A (ja) * 1972-01-31 1973-10-26
JPS59807B2 (ja) * 1972-06-14 1984-01-09 キヤノン株式会社 像変換素子
JPS5913000B2 (ja) * 1972-06-14 1984-03-27 キヤノン株式会社 像変換素子
JPS5740491B2 (ja) * 1973-12-22 1982-08-27
JPS52127133U (ja) * 1976-03-24 1977-09-27
JPS59127084A (ja) * 1983-01-11 1984-07-21 Canon Inc ブレード装置，クリーニング装置および画像形成装置
DE3909114C2 (de) * 1989-03-20 1994-06-01 Heidelberger Druckmasch Ag Druckmittelbeaufschlagte Stelleinrichtung zum Anstellen eines Waschtuchs einer Wascheinrichtung einer Druckmaschine
DE4008159A1 (de) * 1990-03-15 1991-09-19 Heidelberger Druckmasch Ag Reinigungseinrichtung fuer eine druckmaschine
JPH06282122A (ja) * 1992-04-16 1994-10-07 Canon Inc ブレード部材、ブレード部材取り付け方法、プロセスカートリッジ、プロセスカートリッジの組立て方法及び画像形成装置
GB201417029D0 (en) * 2014-09-26 2014-11-12 Rogerson Mark E Improved wiper blade for printer roller

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1269767A (en) * 1915-10-09 1918-06-18 Hoe & Co R Cleaning device for printing-machine inking mechanism.
GB285140A (en) * 1926-11-10 1928-02-10 Wilhelm Mailaender Improvements in or relating to rotary intaglio printing machines
US2097791A (en) * 1935-08-03 1937-11-02 Hoe & Co R Intaglio printing machine
US2582359A (en) * 1946-12-06 1952-01-15 Shaw Percy Roller stripping apparatus
US2774329A (en) * 1954-01-25 1956-12-18 E B Eddy Company Wiping or doctoring devices for removing excess coating from sheet material
US3108539A (en) * 1961-07-14 1963-10-29 Clarence M Champion Vacuum color divider
US3113890A (en) * 1961-06-26 1963-12-10 Kimberly Clark Co Apparatus for smoothing coating materials on a paper web
US3585932A (en) * 1968-06-07 1971-06-22 Wallace H Granger Automatic inking system for rotary newspaper printing press

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1269767A (en) * 1915-10-09 1918-06-18 Hoe & Co R Cleaning device for printing-machine inking mechanism.
GB285140A (en) * 1926-11-10 1928-02-10 Wilhelm Mailaender Improvements in or relating to rotary intaglio printing machines
US2097791A (en) * 1935-08-03 1937-11-02 Hoe & Co R Intaglio printing machine
US2582359A (en) * 1946-12-06 1952-01-15 Shaw Percy Roller stripping apparatus
US2774329A (en) * 1954-01-25 1956-12-18 E B Eddy Company Wiping or doctoring devices for removing excess coating from sheet material
US3113890A (en) * 1961-06-26 1963-12-10 Kimberly Clark Co Apparatus for smoothing coating materials on a paper web
US3108539A (en) * 1961-07-14 1963-10-29 Clarence M Champion Vacuum color divider
US3585932A (en) * 1968-06-07 1971-06-22 Wallace H Granger Automatic inking system for rotary newspaper printing press

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026648A (en) * 1971-12-17 1977-05-31 Canon Kabushiki Kaisha Cleaning device for use in electrophotographic copying apparatus
US4042415A (en) * 1974-05-28 1977-08-16 Xerox Corporation Method for scraping liquids from a moving surface
US5524540A (en) * 1994-12-15 1996-06-11 Van Denend; Mark E. Printing press having doctor blade with integral tape seal thereon
US5685221A (en) * 1995-01-12 1997-11-11 Stretch Devices, Inc. Flood bar for screen printing
WO1997047473A1 (en) * 1996-06-10 1997-12-18 Stretch Devices, Inc. Adjustable flexibility squeegee with replaceable contact blade
US5813330A (en) * 1996-06-10 1998-09-29 Stretch Devices, Inc. Adjustable flexibility squeegee with replaceable contact blade
US6047636A (en) * 1996-06-10 2000-04-11 Stretch Devices, Inc. Method of screen printing using an adjustable flexibility squeegee with replaceable contact blade

Also Published As

Publication number Publication date
DK135031B (da) 1977-02-28
DK135031C (ja) 1977-08-01
FR2179435A5 (ja) 1973-11-16
DE2316608B2 (de) 1975-03-20
GB1399057A (en) 1975-06-25
CA979286A (en) 1975-12-09
DE2316608C3 (de) 1975-10-23
DE2316608A1 (de) 1973-10-11
JPS5129042B2 (ja) 1976-08-23
JPS4915504A (ja) 1974-02-12
BR7302383D0 (pt) 1974-06-27

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