EP0060492A1 - Dispositif de tension du blanchet de caoutchouc pour machines rotatives offset - Google Patents

Dispositif de tension du blanchet de caoutchouc pour machines rotatives offset Download PDF

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Publication number
EP0060492A1
EP0060492A1 EP19820101845 EP82101845A EP0060492A1 EP 0060492 A1 EP0060492 A1 EP 0060492A1 EP 19820101845 EP19820101845 EP 19820101845 EP 82101845 A EP82101845 A EP 82101845A EP 0060492 A1 EP0060492 A1 EP 0060492A1
Authority
EP
European Patent Office
Prior art keywords
pit
tensioning
blanket
rubber blanket
clamping
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.)
Withdrawn
Application number
EP19820101845
Other languages
German (de)
English (en)
Inventor
Werner Ahl
Gerd Hoffmann
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.)
Albert Frankenthal AG
Original Assignee
Albert Frankenthal AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Albert Frankenthal AG filed Critical Albert Frankenthal AG
Publication of EP0060492A1 publication Critical patent/EP0060492A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L38/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41L38/02—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Definitions

  • the invention relates to a blanket tensioning device for offset printing machines, in particular web-fed rotary offset printing machines, in which at the ends of the blanket entering a cylinder pit, a cross-sectionally approximately rectangular tensioning strip, which extends over the pit length and engages through the pit side by evenly distributed over the pit length held clamping screws are adjustable in the clamping direction.
  • the two clamping bars are adjustable by means of independently operable clamping screws and are each received in an assigned, approximately rectangular cross-section groove of the cylinder pit, which is extended towards the pit floor and in the area of the pit dome a middle, after radially outside tapering, the webs assigned to the two grooves separating grooves from each other, the nut-side walls form support surfaces for the tension bars accommodated in the respectively limited grooves, which are penetrated by the associated tensioning screws parallel to the web-side support surfaces and whose small nere width plus a small amount of assembly play corresponds to the width of the pit opening.
  • the upper edge of the web separating the two grooves forms a reference edge, on the basis of which it is easily visible or ascertainable whether the tensioning strips inserted into the grooves are parallel to the reference edges, ie. H. aligned parallel to the axis or inclined against the axis, which enables an exact tension of both rubber blankets that can be individually adapted to the circumstances of the individual case.
  • a tilt-free guidance of the tensioning strips in the respectively assigned groove is advantageously possible.
  • each clamping bar is assigned a groove and these two grooves are practically V-shaped against each other, the use of stable, high clamping bars results in a comparatively small radial pit depth, which can be particularly advantageous for small cylinder diameters. At the same time, however, a comparatively narrow opening cross section is also achieved. Another advantage can be seen in the fact that the cylinder pit can be produced simply by two milling or saw cuts. The advantages that can be achieved with the invention can therefore be seen in particular in a high degree of variability and accuracy.
  • tensioning strips are each attached directly to the associated rubber blanket end, since one of these arrangement with a particularly shallow pit depth.
  • these measures enable a particularly stable riveting of the rails provided in the area of each end of the rubber blanket, one of which is designed as a tensioning strip, since, due to its thickness, this forms a deflection-resistant counter bearing when the rivet connection is produced.
  • an offset printing machine e.g. B. a web-fed offset printing press
  • the printing ink is transferred to the printing material through a rubber blanket indicated at 1 in FIG.
  • the rubber blanket 1 is clamped onto an assigned cylinder 2, which is provided with a cylinder pit 3 in the area of its circumference, in which run in the ends 4 and 5 of the rubber blanket 1 and are held adjustable therein.
  • the ends 4 and 5 of the rubber blanket 1 running around the circumference of the cylinder 2 are provided with thickenings 6 directed towards the top of the rubber blanket 1, the inner edge of which forms a support step 7.
  • strips or rails riveted to the ends of the rubber blanket 1 can simply be provided.
  • the ends of the rubber blanket are expediently riveted between two strips or rails.
  • a tensioning strip 8 is assigned to each end 4 or 5 of the rubber blanket, which acts on the support step 7 of the thickening 6 in question and pulls the assigned end 4 or 5 of the rubber blanket 1 into the cylinder pit 3.
  • the tensioning strips 8 extend over the entire length of the cylinder pit 3 and can be actuated in the tensioning direction by means of tensioning screws 9 distributed uniformly over their length, each of which engages in an assigned thread in the area of the pit floor, i.e. pulled towards the pit floor.
  • tensioning screws 9 distributed uniformly over their length, each of which engages in an assigned thread in the area of the pit floor, i.e. pulled towards the pit floor.
  • both ends 4 and 5 of the rubber blanket 1 can be precisely adjusted or adjusted with regard to their tension, separately and independently of one another.
  • the clamping strips 8 run parallel to the lateral pit walls 10.
  • the clamping screws 9 are arranged approximately in the area of the central longitudinal plane of the clamping strips 8.
  • the pit 3 is flared towards the bottom, so that the clamping strips 8, which are arranged separately next to one another, can be very solid and therefore designed to be pressure-resistant and yet easily accessible next to one another.
  • the clear cross-section of the cylinder pit 3 in the region of the pit opening 11 can advantageously be dimensioned such that the cross-section of the clamping strips 8 is approximately rectangular here are just about to be installed or removed in the radial direction with the rubber blanket on.
  • the smaller width of the cross-sections, which are essentially rectangular in cross-section, corresponds approximately to the inside width of the pit opening 11 minus a slight assembly play.
  • the pit 3 is provided on the bottom side with two grooves 13 which are separated from one another by a central web 12 and are rectangular in cross section and bear against the pit side walls 10, in each of which a clamping bar 8 is received.
  • the clamping strips 8 can rest with their rear side facing away from the pit side wall 10 against the flank of the central web 12 parallel to the side wall, so that there is reliable support and clean guidance.
  • the pit 3 widening at the bottom and having the grooves 13 can simply be produced by two milling or saw cuts or the like which are inclined to a radial plane which contains the pit central longitudinal plane and overlap in the area of the pit opening 11.
  • the middle web 12 between the pits 13 results automatically.
  • the top tip of the web 12 is removed.
  • the upper edge or edges of the web 12 enable easy alignment control of the clamping strips 8.
  • the clamping strips 8 are each provided on the thickening side with a recess formed by a groove which is open on one side, which results in a counter stage 14 assigned to the thickening gssei-bearing stage 7. Below this step engagement, the tensioning strips 8 can rest against the respectively assigned thickening 6 along a surface 15 that is recessed with respect to their outer contour, which means that the tensioning strips are guided with no jamming 8 and the rubber blanket-side thickening 6, thus ensuring high functional reliability.
  • the width of the grooves 13 is expediently dimensioned such that it corresponds to the overall width of a thickening 6 and the clamping bar 8 engaged therewith in the region below the engagement step 14 or support step 7.
  • the tensioning strips 8 have so much free space in the grooves 13 on the bottom side that a stretch of the rubber blanket that results in practice can be readily accommodated.
  • the tensioning strips are fastened directly to the respectively associated end of the rubber blanket 1.
  • the ends of the rubber blanket 1 are gripped between two rails, of which the rail pointing toward the rubber blanket top is designed as a tensioning strip 8.
  • the rail pointing towards the rear can be designed as a thin sheet 16, which is stabilized by the high dimensional accuracy of the associated clamping bar 8.
  • the tensioning strip 8, the associated sheet 16 and the associated end of the rubber blanket 1 are connected to one another by rivets 17, which are expediently located in the area between the holes 18 provided for receiving the tensioning screws.
  • the formation of the rail opposite the sheet 16 as a clamping bar 8, d. H. the direct connection of the tensioning strip 8 with the rubber blanket 1 allows the use of comparatively high and thus stable tensioning strips, which ensure a high degree of bending security, even with a relatively small groove or pit depth.
  • the basic pit shape and screw arrangement of the arrangement according to FIG. 1 also applies to the embodiment according to FIG. 2.
  • To accomplish a tilt-free Guide of the tensioning strips in the respectively assigned pit groove corresponds to the clear pit width of the combined width of tensioning strip 8, rubber blanket 1 and assigned sheet metal 16 plus a slight displacement play.
  • the tensioning strip 8 and the sheet 16 forming the counter rail are guided cant-proof on the flanks of the respectively assigned pit groove.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP19820101845 1981-03-14 1982-03-09 Dispositif de tension du blanchet de caoutchouc pour machines rotatives offset Withdrawn EP0060492A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3109859 1981-03-14
DE19813109859 DE3109859C2 (de) 1981-03-14 1981-03-14 Gummituchspannvorrichtung

Publications (1)

Publication Number Publication Date
EP0060492A1 true EP0060492A1 (fr) 1982-09-22

Family

ID=6127250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820101845 Withdrawn EP0060492A1 (fr) 1981-03-14 1982-03-09 Dispositif de tension du blanchet de caoutchouc pour machines rotatives offset

Country Status (3)

Country Link
EP (1) EP0060492A1 (fr)
JP (1) JPS57160644A (fr)
DE (1) DE3109859C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149036A2 (fr) * 1984-01-17 1985-07-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Cylindre porte-blanchet pour machine rotative d'impression offset
DE3538308A1 (de) * 1984-11-16 1986-05-22 Maschinenfabrik Wifag, Bern Vorrichtung zum aufziehen eines gummituches auf einen gummituchzylinder einer rotationsdruckmaschine
DE4210778A1 (de) * 1992-04-01 1993-10-07 Roland Man Druckmasch Gummituchspannung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345369A1 (de) * 1983-12-15 1985-06-27 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Einrichtung zur befestigung einer druckplatte am plattenzylinder einer druckmaschine
DE3813777A1 (de) * 1988-04-23 1989-11-02 Roland Man Druckmasch Spanneinrichtung zum befestigen einer biegsamen folie
JPH0319038U (fr) * 1989-06-30 1991-02-25
DE4425189C1 (de) * 1994-07-16 1996-02-01 Koenig & Bauer Albert Ag Verfahren und Vorrichtung zum Befestigen und Spannen eines Aufzuges auf einem Zylinder einer Rotationsdruckmaschine
DE19616337C2 (de) * 1996-04-24 1999-04-15 Roland Man Druckmasch Verfahren und Vorrichtung zum Befestigen und Spannen eines Drucktuches

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE419666C (de) * 1923-03-28 1925-10-07 Linotype Machinery Ltd Vorrichtung zum Aufspannen von biegsamen Druckplatten auf den Plattenzylinder
GB925330A (en) * 1961-11-14 1963-05-08 Miehle Goss Dexter Inc Blanket lockup arrangement
US3893394A (en) * 1973-03-28 1975-07-08 Wood Industries Inc Blanket cylinder slot arrangement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE423386C (de) * 1925-12-29 Vogtlaendische Maschinenfabrik Vorrichtung zum Festspannen biegsamer Druckplatten bei Rotationsdruckmaschinen
US1545791A (en) * 1925-03-28 1925-07-14 Owen Malcolm Printing cylinder
US2121309A (en) * 1935-03-28 1938-06-21 Standard Process Corp Rotary printing press
US2929323A (en) * 1959-06-03 1960-03-22 J W Clement Company Lock-up device
DE2606223A1 (de) * 1976-02-17 1977-08-18 Maschf Augsburg Nuernberg Ag Vorrichtung zum spannen des gummituches einer offsetdruckmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE419666C (de) * 1923-03-28 1925-10-07 Linotype Machinery Ltd Vorrichtung zum Aufspannen von biegsamen Druckplatten auf den Plattenzylinder
GB925330A (en) * 1961-11-14 1963-05-08 Miehle Goss Dexter Inc Blanket lockup arrangement
US3893394A (en) * 1973-03-28 1975-07-08 Wood Industries Inc Blanket cylinder slot arrangement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149036A2 (fr) * 1984-01-17 1985-07-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Cylindre porte-blanchet pour machine rotative d'impression offset
EP0149036A3 (en) * 1984-01-17 1985-08-07 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Blanket cylinder for rotative offset printing machine
DE3538308A1 (de) * 1984-11-16 1986-05-22 Maschinenfabrik Wifag, Bern Vorrichtung zum aufziehen eines gummituches auf einen gummituchzylinder einer rotationsdruckmaschine
DE4210778A1 (de) * 1992-04-01 1993-10-07 Roland Man Druckmasch Gummituchspannung
US5329853A (en) * 1992-04-01 1994-07-19 Man Roland Druckmaschinen Ag Blanket clamping device

Also Published As

Publication number Publication date
JPS57160644A (en) 1982-10-04
DE3109859C2 (de) 1983-05-11
DE3109859A1 (de) 1982-09-23

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Inventor name: HOFFMANN, GERD

Inventor name: AHL, WERNER