US2495269A - Machine for preparing lithographic or other printing plates as well as rubber sheets used in offset printing - Google Patents

Machine for preparing lithographic or other printing plates as well as rubber sheets used in offset printing Download PDF

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Publication number
US2495269A
US2495269A US643271A US64327146A US2495269A US 2495269 A US2495269 A US 2495269A US 643271 A US643271 A US 643271A US 64327146 A US64327146 A US 64327146A US 2495269 A US2495269 A US 2495269A
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US
United States
Prior art keywords
drum
machine
printing
well
lithographic
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Expired - Lifetime
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US643271A
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English (en)
Inventor
Lindmark Johan Gunnar
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Johnson & Borsell AB
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Johnson & Borsell AB
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Filing date
Publication date
Application filed by Johnson & Borsell AB filed Critical Johnson & Borsell AB
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Publication of US2495269A publication Critical patent/US2495269A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/06—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B24C3/28—Apparatus using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/04—Graining or abrasion by mechanical means

Definitions

  • the present invention relates to the preparation of lithographic or other printing plates as well as of rubber sheets used in the art of oiiset printing.
  • lithographic printing plates of zinc or other material must present, over their entire printing surface, a uniform finer or coarser granulation or grain which is generally obtained by grinding the printing surface.
  • Such a grinding of the plate must be efiected not only when it is desired to prepare an entirely new printing plate, but also an old printing plate, from which the lithographic picture has been washed away, must as a rule be ground again before it can be used anew, particularly if corrections of the old lithographic picture have been effected by grinding with coal or in similar manner.
  • the present invention has for its object to provide a machine for preparing the printing surface of lithographic or other printing plates as well as the surface of rubber sheets used in the art of offset printing, by the use of which machine the grinding process may be completed in a considerably shorter time than has been hitherto possible and, furthermore, a surface grain may be readily obtained that is more uniform and better adapted to the requirements in each particular case than the grain obtainable with the old methods.
  • a machine which comprises in combination a rotatable drum, means for clamping the printing plate or rubber sheet onto said drum, and one or more sand blast nozzles directed towards the drum and adapted to be moved back and forth along the same so as to cover the entire printing plate or the like, while ejecting sand or other grinding medium onto the plate or the like.
  • FIG. 1 is a vertical longitudinal section through 8 Claims. (Cl. 51-45) a blasting machine made in accordance with my invention,
  • Fig. 2 is a sectional view, partly in elevation, taken along the line II-II in Fig. 3,
  • Fig. 3 is a vertical transverse section of the machine taken along the line III-III of Fig. '1,
  • Fig. 4 is a partial sectional view of a modification, similar to the lower portion of Fig. '2 but showing the use of a pair of blast nozzles,
  • Fig. 5 is a partial vertical transverse section on a larger scale, similar to the upper portion of Fig. 3, but showing a modification in which sealing means are provided for closing the slot through which the blast nozzles pass, while Fig. 6 is a fragmental sectional view of the modification of Fig. 5, taken along the line 6-6 of this figure.
  • a drum i l on which a lithographic printing plate 12 of zinc or other material may be secured by means of clamping jaws l3, said drum being rotatably journalled by means of a suitable shaft M, which is driven at a variable speed from an electromotor I5 through the intermediary of a worm-wheel gearing Hi.
  • a comparatively narrow rectangular opening which is closed by means of a cylinder or guide 11 journalled in the housing so as to be rotatable around its own axis.
  • a slot I8 is provided through which a reclprocable sand blast nozzle I9 projects into the housing.
  • the reciprocating movement of the blast nozzle I9 is derived from a longitudinally extending screw spindle 2 0, which is journalled in end plates 2! united with the cylinder l1 and cooperates with a nut 22 which is connected with a holder 23 in which the nozzle I9 is axially displaoeable for the purpose of setting the nozzle at the desired distance from the drum.
  • the screw spindle 20 is driven by means of a worm-wheel gearing or belt drive 25 at a variable speed from an electromotor 24 mounted on the projecting end of the shaft of the cylinder H.
  • adjustable limit abutments 26 which change the direction of the rotation of the motor under control of the nozzle by mechanical or electrical means.
  • the interior of the housing I is in communication with a suction fan or the like through the intermediary of a conduit 28 so that a subatmospheric pressure is always maintained in the machine, whereby dust is prevented from emerging into the workroom.
  • a suction fan or the like may be closed by means of an elastic sealing device, for instance consisting of two flexible bands of rubber or the like, as shown at 29' and 30 in Figs. and 6, which bands in their normal position cover the slit opening.
  • the drum I I is preferably rotated at so high a speed that the' stresses in the printing plate I2 clamped to the drum are increased considerably through the action of the centrifugal force.
  • a drum having a diameter of about 50 centimeters is thus preferablypermitted to rotate at a speed of the order of magnitude of 100 revolutions per minute, corresponding to a peripheral speed of about 260 cm. per second.
  • the blast nozzle I9 moves slowly at a constant speed back and.
  • the drum I I sprays sand or other grinding medium at high velocity against the printing plate I2, which is cleaned by the grind ing efiect of the sand and obtains an evenly grainedsurface, the character of the grain being variable through a suitable selection of the distance of the nozzle from the drum and the direction of the nozzle with respect to the envelope surface thereof and through selection of a suitable sort of sand and a suitable air velocity.
  • sand another grinding material comparable therewith may be used, of course, for instance saw dust.
  • the velocity of movement of the nozzle should be so selected with respect to the speed of rotation of the drum that the nozzle is not periodically directed to exactly the same points of the printing plate.
  • the invention is, of course, not restricted to the embodiment described above and illustrated on the drawing, but various modifications are conceivable without receding from the inventive idea.
  • a driving means for the sand or other grinding medium some other gas than air, for instance nitrogen or some other non-oxidizing gas.
  • the machine may be provided with means for moistening the printing plate or rubber sheet with water or other liquid during the sand blasting operation, as shown at 3
  • the machine may be used not only for graining the surface of a printing plate from which the old lithographic picture has been removed by washing with a suitable solvent, but also the removal of the old picture may be effected by sand blasting in the machine.
  • a machine for graining lithographic and other printingplates as well as rubber sheets used in the art of oiiset printing comprising in combination a rotatable drum, means for rotating said drum at a high peripheral speed, means for removably securing the work on said drum,; a
  • housing for said drum, an elongated opening in said housing extending in parallel with the axis of rotation of said drum, elastic sealing members for, said opening, at least one sand blast nozzle extending through said normally sealed opening towards said drum, means for moving said nozzle along said opening while elastically deflecting said sealing means, and suction means communieating with said housing and adapted to maintain a sufficient subatmospheric pressure therein to prevent dust from emerging into the surrounding locality.
  • a machine for graining lithographic and other printing plates as well as rubber sheets used in the art of offset printing of the type having awork-holding drum adapted to rotate the work at a high peripheral speed through a blast of grinding material, the improvement which comprises a housing for said drum having an elongated opening extending longitudinally of the drum, a
  • rotatably mounted cylinder covering said elongated opening and having a longitudinal slot therein, at least one sand blast nozzle extendingthrough said opening and directed towards said drum, means for reciprocating said sand blast nozzle along said opening, means for rotatably adjusting said cylinder and blast nozzle andmeans for axially displacing said nozzle to set it.
  • a machine for graining lithographic and other printing plates as well as rubber sheets used in the art of offset printing, comprising in com-;
  • bination a rotatable drum, means for rotating said drum at a high peripheral speed, means for.
  • a housing for said drum an elongated opening in said housing extending in parallel with the axis of rotation of said drum, means for sealing said elongated opening, at least one sand blast nozzle extending through said elongated opening and directed towards said drum, means for mov-,; ing said nozzle along said opening while main taining said sealing means operative and suction means communicating with said housing and adapted to maintain a sufiicient sub-atmospheric pressure therein to prevent dust from emerginginto the surrounding locality.
  • a machine for graining lithographic and other printing plates as well as rubber sheetsused in the art of offset printing comprising in ofrotation of said drum, a cylindrical guide mounted adjacent said opening and parallel therewith, at least one sand blast nozzle mounted on said guide, extending through said elongated opening and directed towards said drum, means.
  • a machine for graining lithographic and other printing plates as well as rubber sheets used in the art of offset printing comprising in combination a rotatable drum, means for removably securing the work on said drum, a housing for said drum, an elongated opening in said housing extending in parallel with the axis of l6 rotation of said drum, a cylindrical guide mountzle slowly and at constant speed in a reciprocating motion along said guide, and suction means communicating with said housing and adapted to maintain a suflicient sub-atmospheric pressure therein to prevent dust from emerging into the surrounding locality.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
US643271A 1945-01-26 1946-01-25 Machine for preparing lithographic or other printing plates as well as rubber sheets used in offset printing Expired - Lifetime US2495269A (en)

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Application Number Priority Date Filing Date Title
SE2495269X 1945-01-26

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US643271A Expired - Lifetime US2495269A (en) 1945-01-26 1946-01-25 Machine for preparing lithographic or other printing plates as well as rubber sheets used in offset printing
US87313A Expired - Lifetime US2516222A (en) 1945-01-26 1949-04-13 Graining of lithographic and other printing plates

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US87313A Expired - Lifetime US2516222A (en) 1945-01-26 1949-04-13 Graining of lithographic and other printing plates

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BE (1) BE484986A (en))
CH (1) CH271453A (en))
FR (1) FR926380A (en))

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2590819A (en) * 1949-07-08 1952-03-25 Pangborn Corp Roll blasting equipment
US2629207A (en) * 1950-10-09 1953-02-24 Pangborn Corp Plate blasting machine
US2669810A (en) * 1950-01-28 1954-02-23 Eppler Method and apparatus for graining lithographic plates
US2697899A (en) * 1950-03-21 1954-12-28 Johnson & Borsell Ab Clamping bar
US2712172A (en) * 1953-08-24 1955-07-05 Emerson Radio And Phonograph C Method and apparatus for making variable capacitors
US2743554A (en) * 1952-04-19 1956-05-01 Int Resistance Co Apparatus for blast etching electrical devices
US2773332A (en) * 1953-10-30 1956-12-11 Shallcross Mfg Company Machine and method for cutting helical film resistors
US2869291A (en) * 1955-05-03 1959-01-20 Michael Abraham Shot blasting machines
US2953876A (en) * 1958-11-05 1960-09-27 Edna I Zieber Automatic blasting control
US3391494A (en) * 1967-06-21 1968-07-09 Floyd S. Dye Jr. Electrical control arrangement for a sandblasting machine
US3436866A (en) * 1967-10-23 1969-04-08 Will Burt Co The Automatic sandblast machine
US3523391A (en) * 1967-03-13 1970-08-11 Intercontinental Mfg Co Inc Abrasive blast cleaning apparatus
EP0127091A3 (en) * 1983-05-19 1985-08-28 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic printing plate
US20060042490A1 (en) * 2004-08-28 2006-03-02 Man Roland Druckmaschinen Ag Method and apparatus for de-imaging a printing forme
US20110117823A1 (en) * 2009-11-13 2011-05-19 Lynn William R Containment barrier for use with surface treatment
US20150197078A1 (en) * 2012-09-26 2015-07-16 Contitech Elastomer-Beschichtungen Gmbh Grinding method for printing forms in the area of flexo or relief printing
US11712776B2 (en) * 2018-02-02 2023-08-01 Terry Sullivan Rotor polishing device

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB727102A (en) * 1951-07-30 1955-03-30 Standard Rate & Data Service I Process for producing a lithographic printing plate
US2731775A (en) * 1952-03-05 1956-01-24 Simonsen Kristian Julius Method of cleaning and decolorizing shoes and other leather articles
US3122863A (en) * 1961-05-23 1964-03-03 Ajem Lab Inc Scalloped edge on settling tank for grit blasting
US3237351A (en) * 1961-06-15 1966-03-01 Ajem Lab Inc Method for handling grit
US3228146A (en) * 1962-05-07 1966-01-11 Jr Walter E Rosengarten Cleaning tool
US3262234A (en) * 1963-10-04 1966-07-26 Int Rectifier Corp Method of forming a semiconductor rim by sandblasting
AU5079679A (en) * 1978-09-15 1980-03-20 Wilke & Co. Lithographic master base material
GB2144771B (en) * 1983-08-12 1987-03-11 Deccospray Limited Method of screening plastics electronics containers
US4833486A (en) * 1987-07-08 1989-05-23 Dataproducts Corporation Ink jet image transfer lithographic
US5274964A (en) * 1992-08-19 1994-01-04 Abrasive Cleaning Systems, Inc. Dry abrasive belt cleaner
US20160067844A1 (en) * 2015-11-13 2016-03-10 Caterpillar Inc. Machining center with abrasive blasting system
CN111571317A (zh) * 2020-06-02 2020-08-25 叶县广达铝业有限责任公司 一种阳极氧化铝带生产线喷砂装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US370987A (en) * 1887-10-04 stone
US1091036A (en) * 1912-11-04 1914-03-24 Company Le Sablage Ind Machine for cleaning and graining lithographic stones, zinc, &c.
US1476854A (en) * 1922-11-03 1923-12-11 Dewit N Tilley Flue-cleaning apparatus
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2005654A (en) * 1934-01-09 1935-06-18 Fritsche Rudolf Lithographic plate graining device
US2276594A (en) * 1939-11-17 1942-03-17 George T Trundle Process of preparing printing members and product thereof
US2332251A (en) * 1941-01-23 1943-10-19 Walter H Gale Surface treating device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US370987A (en) * 1887-10-04 stone
US1091036A (en) * 1912-11-04 1914-03-24 Company Le Sablage Ind Machine for cleaning and graining lithographic stones, zinc, &c.
US1476854A (en) * 1922-11-03 1923-12-11 Dewit N Tilley Flue-cleaning apparatus
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2005654A (en) * 1934-01-09 1935-06-18 Fritsche Rudolf Lithographic plate graining device
US2276594A (en) * 1939-11-17 1942-03-17 George T Trundle Process of preparing printing members and product thereof
US2332251A (en) * 1941-01-23 1943-10-19 Walter H Gale Surface treating device

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2590819A (en) * 1949-07-08 1952-03-25 Pangborn Corp Roll blasting equipment
US2669810A (en) * 1950-01-28 1954-02-23 Eppler Method and apparatus for graining lithographic plates
US2697899A (en) * 1950-03-21 1954-12-28 Johnson & Borsell Ab Clamping bar
US2629207A (en) * 1950-10-09 1953-02-24 Pangborn Corp Plate blasting machine
US2743554A (en) * 1952-04-19 1956-05-01 Int Resistance Co Apparatus for blast etching electrical devices
US2712172A (en) * 1953-08-24 1955-07-05 Emerson Radio And Phonograph C Method and apparatus for making variable capacitors
US2773332A (en) * 1953-10-30 1956-12-11 Shallcross Mfg Company Machine and method for cutting helical film resistors
US2869291A (en) * 1955-05-03 1959-01-20 Michael Abraham Shot blasting machines
US2953876A (en) * 1958-11-05 1960-09-27 Edna I Zieber Automatic blasting control
US3523391A (en) * 1967-03-13 1970-08-11 Intercontinental Mfg Co Inc Abrasive blast cleaning apparatus
US3391494A (en) * 1967-06-21 1968-07-09 Floyd S. Dye Jr. Electrical control arrangement for a sandblasting machine
US3436866A (en) * 1967-10-23 1969-04-08 Will Burt Co The Automatic sandblast machine
EP0127091A3 (en) * 1983-05-19 1985-08-28 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic printing plate
US20060042490A1 (en) * 2004-08-28 2006-03-02 Man Roland Druckmaschinen Ag Method and apparatus for de-imaging a printing forme
EP1629991A3 (de) * 2004-08-28 2009-03-11 manroland AG Verfahren und Vorrichtung zum Entbildern einer Druckform
US8926405B2 (en) 2008-11-13 2015-01-06 William R Lynn Surface treatment system and method for achieving a substantially uniform surface profile for a treated surface
US20110117823A1 (en) * 2009-11-13 2011-05-19 Lynn William R Containment barrier for use with surface treatment
US8556683B2 (en) * 2009-11-13 2013-10-15 William R. Lynn Containment barrier for use with surface treatment
US20150197078A1 (en) * 2012-09-26 2015-07-16 Contitech Elastomer-Beschichtungen Gmbh Grinding method for printing forms in the area of flexo or relief printing
US9434149B2 (en) * 2012-09-26 2016-09-06 Contitech Elastomer-Beschichtungen Gmbh Grinding method for printing forms in the area of flexo or relief printing
US11712776B2 (en) * 2018-02-02 2023-08-01 Terry Sullivan Rotor polishing device

Also Published As

Publication number Publication date
US2516222A (en) 1950-07-25
BE484986A (en))
CH271453A (de) 1950-10-31
FR926380A (fr) 1947-09-30

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