US2826126A - Scraper blades for paper stock screening machines - Google Patents
Scraper blades for paper stock screening machines Download PDFInfo
- Publication number
- US2826126A US2826126A US397120A US39712053A US2826126A US 2826126 A US2826126 A US 2826126A US 397120 A US397120 A US 397120A US 39712053 A US39712053 A US 39712053A US 2826126 A US2826126 A US 2826126A
- Authority
- US
- United States
- Prior art keywords
- blade
- screen
- paper stock
- scraper blades
- screening machines
- 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
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-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/04—Flat screens
Definitions
- Figure 1 is a plan view of a portion of a rotating hub member carrying arms having scraper blades mounted thereon.
- Figure 2 is a front elevation of a scraper blade.
- Figure 3 is a section on the line 33 of Figure 1.
- Figure 4 is a section on the line 4-4 of Figure 1.
- the scraper blade of the invention comprises an elongated steel strip 1 of a length such that when secured to the front face of one of the rotating arms 2, as hereinafter described, it will extend across the entire width of the perforated area of the screen 3.
- the lower front edge 4 of the blade which is in contact with the screen is hardened.
- the upper edge 5 of the blade is provided with a series of slots 6 which receive the bolts 7 which are used to secure the blade to the arm.
- the slots are distributed along the blade at regular intervals of three to six inches. Said slots extend rather deeply into the blade, as for example, in the blade illustrated, the depth of the slots is at least half the width of the blade.
- the upper and lower edges of the blade are normally substantially straight edges, but when the blades are being installed, the bolts 7 are first set up only moderately, and the upper edge 5 of the blade is then tapped with a hammer until the lower edge 4 is in contact with the screen along its entire length.
- the deep slots in the upper edge of the blade permit the blade to bend and warp slightly and sufficiently to accommodate itself to irregularities in the transverse contour of the screen.
- a scraper blade for each of said arms and extending across the perforated area of said screen, said blade having normally substantially straight upper and lower edges, said upper edge being provided with a series of relatively deep slots distributed along the length of the blade, bolts passing through said slots and securing said blade to said arm, said slots permitting said blade to be bent and warped to cause said lower edge to assume a curved contour to conform to the transverse contour of the screen.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Paper (AREA)
Description
March 11, 1958 E, COMES 2,826,126
SCRAPER BLADES FOR PAEER STOCK SCREENING MACHINES Filed Dec. 9, 1955 4 SNNNRINZIN NNNNlA H LT WW IN VEN TOR.
ATTORNEYS ER BLADES FGR PAPER STOCK SCREENING MACHINES Edwin Cowles, Cayuga, N. Y., assiguor to The Cowles Company, Princeton, N. 3., a corporation of New Jersey Application December 9, 1953, Serial No. 397,120 1 Claim. (Cl. 9229) terial. it is of the utmost importance to the efilcient operation of such machines that all of the screen perforations be kept clear at all times. Therefore, the scraper blades should contact the screen throughout their length, that is, across the entire width of the perforated area of the screen, so that all of the screen perforations will be cleared on each sweep of each blade.
In actual commercial manufacturing practice, working within usual foundry and machine shop tolerances, it has been found to be extremely difficult to mount the perfm rated screens in the casings of such machines in such manner as to insure that the entire area of the surface which is engaged by the scraper blades lies in a single plane. Various dimensional discrepancies in casting or in machining contribute, sometimes cumulatively to slight bending or warping of the screen surfaces, sometimes in one direction and sometimes in another, with the result that a scraper blade set correctly to sweep a single plane surface will not contact portions of the warped screen surface and some perforations will not be cleared. Moreover, in the operation of the machine, wear occurs more rapidly at the outer end of the blades than at the inner ends. When this occurs the clearing of the outer perforations is less eifective. Various expedients such as hinged scrapers, flexible scrapers and the like have been tried but have not proved satisfactory.
It is an object of the present invention to provide an improved scraper which can be adjusted to the contour of a slightly warped screen a swell as to a correct screen.
Other objects and advantages of the invention will appear hereinafter.
A preferred embodiment of the invention selected for purposes of illustration is shown in the accompanying drawings, in which,
Figure 1 is a plan view of a portion of a rotating hub member carrying arms having scraper blades mounted thereon.
Figure 2 is a front elevation of a scraper blade.
Figure 3 is a section on the line 33 of Figure 1.
Figure 4 is a section on the line 4-4 of Figure 1.
Referring to the drawings, the scraper blade of the invention comprises an elongated steel strip 1 of a length such that when secured to the front face of one of the rotating arms 2, as hereinafter described, it will extend across the entire width of the perforated area of the screen 3. Preferably the lower front edge 4 of the blade which is in contact with the screen is hardened.
The upper edge 5 of the blade is provided with a series of slots 6 which receive the bolts 7 which are used to secure the blade to the arm. The slots are distributed along the blade at regular intervals of three to six inches. Said slots extend rather deeply into the blade, as for example, in the blade illustrated, the depth of the slots is at least half the width of the blade.
The upper and lower edges of the blade are normally substantially straight edges, but when the blades are being installed, the bolts 7 are first set up only moderately, and the upper edge 5 of the blade is then tapped with a hammer until the lower edge 4 is in contact with the screen along its entire length. The deep slots in the upper edge of the blade permit the blade to bend and warp slightly and sufficiently to accommodate itself to irregularities in the transverse contour of the screen.
It will be understood that the invention may be variously modified and embodied within the scope of the subjoined claims.
I claim as my invention:
In a paper stock screening machine having a perforated screen and rotating arms to clear said perforations, a scraper blade for each of said arms and extending across the perforated area of said screen, said blade having normally substantially straight upper and lower edges, said upper edge being provided with a series of relatively deep slots distributed along the length of the blade, bolts passing through said slots and securing said blade to said arm, said slots permitting said blade to be bent and warped to cause said lower edge to assume a curved contour to conform to the transverse contour of the screen.
References Cited in the file of this patent UNITED STATES PATENTS
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US397120A US2826126A (en) | 1953-12-09 | 1953-12-09 | Scraper blades for paper stock screening machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US397120A US2826126A (en) | 1953-12-09 | 1953-12-09 | Scraper blades for paper stock screening machines |
Publications (1)
Publication Number | Publication Date |
---|---|
US2826126A true US2826126A (en) | 1958-03-11 |
Family
ID=23569914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US397120A Expired - Lifetime US2826126A (en) | 1953-12-09 | 1953-12-09 | Scraper blades for paper stock screening machines |
Country Status (1)
Country | Link |
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US (1) | US2826126A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3035698A (en) * | 1958-12-19 | 1962-05-22 | Raybestos Manhattan Inc | Refinement of asbestos |
US4123317A (en) * | 1975-10-31 | 1978-10-31 | Myrens Verksted A/S | Method and an apparatus for processing finely divided fibrous pulp with gas without overpressure |
US4432412A (en) * | 1980-08-23 | 1984-02-21 | Lothar Teske | Cooling device |
EP0120766A1 (en) * | 1983-03-25 | 1984-10-03 | E. + M. Lamort Société Anonyme dite: | Process and apparatus for sorting a mixture of paper pulp and impurities |
EP0716181A2 (en) | 1994-12-06 | 1996-06-12 | Ing. S. Maule & C. Spa | Apparatus for screening scrap material from an aqueous mixture containing recycled paper pulp, and stirring tool for use in this apparatus |
US20100326927A1 (en) * | 2009-06-24 | 2010-12-30 | Dendel Joseph W | Rotary scraper plows for rotary fan press |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1259139A (en) * | 1917-05-24 | 1918-03-12 | Orange James Salisbury | Rotary suction-filter. |
US1415859A (en) * | 1921-03-08 | 1922-05-16 | Nat Aniline & Chem Co Inc | Scraper for rotary filters |
-
1953
- 1953-12-09 US US397120A patent/US2826126A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1259139A (en) * | 1917-05-24 | 1918-03-12 | Orange James Salisbury | Rotary suction-filter. |
US1415859A (en) * | 1921-03-08 | 1922-05-16 | Nat Aniline & Chem Co Inc | Scraper for rotary filters |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3035698A (en) * | 1958-12-19 | 1962-05-22 | Raybestos Manhattan Inc | Refinement of asbestos |
US4123317A (en) * | 1975-10-31 | 1978-10-31 | Myrens Verksted A/S | Method and an apparatus for processing finely divided fibrous pulp with gas without overpressure |
US4432412A (en) * | 1980-08-23 | 1984-02-21 | Lothar Teske | Cooling device |
EP0120766A1 (en) * | 1983-03-25 | 1984-10-03 | E. + M. Lamort Société Anonyme dite: | Process and apparatus for sorting a mixture of paper pulp and impurities |
EP0716181A2 (en) | 1994-12-06 | 1996-06-12 | Ing. S. Maule & C. Spa | Apparatus for screening scrap material from an aqueous mixture containing recycled paper pulp, and stirring tool for use in this apparatus |
US20100326927A1 (en) * | 2009-06-24 | 2010-12-30 | Dendel Joseph W | Rotary scraper plows for rotary fan press |
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