EP0099275A1 - Vorrichtung zur Befestigung eines Zylinderüberzugs in Druckmaschinen - Google Patents

Vorrichtung zur Befestigung eines Zylinderüberzugs in Druckmaschinen Download PDF

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Publication number
EP0099275A1
EP0099275A1 EP83401140A EP83401140A EP0099275A1 EP 0099275 A1 EP0099275 A1 EP 0099275A1 EP 83401140 A EP83401140 A EP 83401140A EP 83401140 A EP83401140 A EP 83401140A EP 0099275 A1 EP0099275 A1 EP 0099275A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
screws
bar
fixing
covering
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
Application number
EP83401140A
Other languages
English (en)
French (fr)
Other versions
EP0099275B1 (de
Inventor
Philippe Lechat
Alain Ducournau
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.)
Creusot Loire SA
Original Assignee
Creusot Loire SA
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 Creusot Loire SA filed Critical Creusot Loire SA
Publication of EP0099275A1 publication Critical patent/EP0099275A1/de
Application granted granted Critical
Publication of EP0099275B1 publication Critical patent/EP0099275B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • B41F27/1237—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 by translatory motion substantially perpendicular to support surface

Definitions

  • the present invention relates to a device for fixing the covering of a cylinder of a printing machine.
  • the invention can be applied in particular to rotary presses of the "offset" type, in which the covering of the cylinder generally consists of a rubberized fabric commonly called "Hanchet".
  • the fixing of the blanket to the corresponding cylinder has raised many problems.
  • the blanket is an essential part of a printing machine, and the quality of the printing depends on its tension and its positioning in relation to the cylinder.
  • the removal or the installation of the blanket must be able to be carried out starting from fast, simple maneuvers, while ensuring -a good precision.
  • a known fixing device comprises a rotating shaft arranged in a bore extending longitudinally in the cylinder, the ends of the blanket being fixed to this shaft, and their tension being caused by the rotation of this shaft.
  • Such a device has the drawback of creating a large recess in the cylinder, a relatively wide opening, and poses major machining problems.
  • Another known blanket fixing device comprises a groove with parallel faces formed in the cylinder, and screws arranged stiffly in the groove and coming to bear on a bar whose face directed towards the center of the cylinder comes to grip on the bars fixed to the ends of the blanket.
  • Such a device has the drawback of requiring a fairly large width of the groove since this groove must allow the passage at the same time of the two ends of the blanket, of the clamping screws as well as of the fixing bar.
  • Such a device also presents difficulties in mounting the blanket because it is necessary to simultaneously screw a large number of screws.
  • Another known blanket fixing device comprises, in a groove made in the cylinder, two independent series of screws and of fixing bars, each of these two series being intended for fixing one and the other of the two ends of the blanket.
  • Such a device is relatively complicated, quite bulky, and presents difficulties in mounting and adjusting the tension.
  • the present invention aims to overcome the various drawbacks mentioned above.
  • the invention therefore relates to a device for fixing the covering of a cylinder of a printing machine, the covering coming to surround the cylinder and comprising, at its two ends, fixing bars, the fixing device coming to be mounted in a longitudinal and radial groove in the cylinder.
  • the fixing device comprises a rigid tension bar and in one piece, coming to engage in the groove formed in the cylinder, this tension bar comprising shoulders at its area external, these shoulders being intended to retain the bars linked to the covering, this bar further comprising radial indentations extending from the external zone to below the bars when these are in place against the shoulders corresponding, and this fixing device further comprises screws radially passing through the fixing bar at the bottom of the notches, by screwing into the bottom of the groove made in the cylinder.
  • said shoulders of the tension bar are offset relative to each other radially in order to allow the gripping of one of the bars of the covering before the other bar, during the progressive introduction of the fixing bar inside the groove in the cylinder.
  • said screws consist of a first series of screws, two in number, threaded over their entire useful length, and of a second series of screws, in greater number , threaded only over a short length from their head, the extremity of these screws of the second series being of cylindrical shape of smaller diameter, in order to facilitate lec9but of screwing, during assembly, by acting, at first , only on the screws of the first series, the final tension being effected by acting on all the screws.
  • FIG. 2 there is a cylinder 10 of the printing machine covered, on its cylindrical part, with a covering made of a rubberized fabric, commonly called “blanket”.
  • This cylinder is provided with a longitudinal and radial groove 11, in which is mounted all of the elements constituting the device for fixing the covering 12.
  • the device for fixing the covering is shown in the position which it occupies when the operation for fixing the covering 12 is completed, that is to say when the covering 12 is perfectly positioned and stretched on the cylinder 10.
  • the covering 12 has, at its two ends, identical bars 13, 14.
  • the fixing device generally comprises a fixing bar 1 threaded in the groove 11, intended to grip the bars 13 and 14 in order to cause the tension of the covering 12, and of the screws 6, 7 intended to fix the fixing bar 1 inside the groove 11, gradually causing this fixing bar 1 to move radially in the direction of the center of the cylinder 10, in order to cause the progressive tensioning of the covering 12.
  • the fixing bar 1 is made in one piece, in a sufficiently rigid material, and has a length corresponding substantially to the length of the cylinder 10 and corresponding cladding 12.
  • the fixing rod 1 has an s * irs- describing shape generally in a parallelepiped elongated shape substantially corresponding to the shape of the groove 11 formed in the cylinder 10.
  • the bar fixing 1 more specifically comprises a lower part 20 whose two lateral faces are parallel and slide on the corresponding parallel faces of the groove 11, in order to constitute a correct radial guide of the bar 1 inside the corresponding housing 11.
  • the bar 1 also comprises an external zone 2 provided with lateral shoulders on either side 18 and 19 extending longitudinally.
  • the fixing bar 1 also has a pluiality radial notches 3 extending from the external zone 2 to below the bars 13 and 14, when these are in place against the corresponding shoulders 18 and 19.
  • This fixing bar 1 finally has holes passing radially the bar at its lower zone 20, these holes being formed in the bottom of each of the notches 3, these holes allowing the passage of screws 6, 7 whose corresponding screw heads are supported on the bottom of each of the notches 3. Referring to Figure 2, we see that these screws 6, 7 are screwed into the cylinder 10, in the bottom of the groove 11.
  • the screwing of the screws 6, 7 in the cylinder 10 can be done directly in a hole tapped from this cylinder 10 or in a part forming a nut 15 fixed rig ideally in cylinder 10.
  • the shoulders 18 and 19 are offset radially with respect to each other so that the attachment is carried out on a bar first, then on the other bar.
  • the notches 3 formed in the fixing bar 1 are sufficient sufficiently deep so that the heads of the screws 6 and 7 are located below the bars 13 and 14. Under these conditions, it can be seen that it is possible to constitute a fixing bar 1 of very small thickness, and consequently to constitute a groove 11 of very small width. Indeed, the width of and the groove 11 is limited to the sum of the thicknesses of the bars 13 and 14 / of the central part 21 of the bar 1, which can be very thin.
  • the operation of the fixing bar 1 inside the housing 11 is carried out by the simultaneous operation of all the screws 6 and 7 which must be enough large number to ensure a uniform positioning and tension of the covering 12.
  • the simultaneous operation of this large number of screws is a difficult and long operation and, to remedy this drawback, the following arrangement has been proposed: the screws fixing are made up of two different sets of screws, the first set of screws is made up of two screws 6 threaded over their entire useful length, and the second set of screws is made up of the other screws 7, in greater number, threaded only on a short length 8 from their head, the end 9 of these screws being of cylindrical shape of smaller diameter.
  • the invention is not limited to the embodiment which has just been described, by way of example, but it extends to all mechanical equivalents and can on the other hand find various applications in different machines for impression.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP19830401140 1982-06-04 1983-06-03 Vorrichtung zur Befestigung eines Zylinderüberzugs in Druckmaschinen Expired EP0099275B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209772A FR2527983B1 (fr) 1982-06-04 1982-06-04 Dispositif de fixation de l'habillage d'un cylindre de machine d'impression
FR8209772 1982-06-04

Publications (2)

Publication Number Publication Date
EP0099275A1 true EP0099275A1 (de) 1984-01-25
EP0099275B1 EP0099275B1 (de) 1986-04-16

Family

ID=9274649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830401140 Expired EP0099275B1 (de) 1982-06-04 1983-06-03 Vorrichtung zur Befestigung eines Zylinderüberzugs in Druckmaschinen

Country Status (3)

Country Link
EP (1) EP0099275B1 (de)
DE (1) DE3363041D1 (de)
FR (1) FR2527983B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3707066A1 (de) * 1987-03-05 1988-09-15 Roland Man Druckmasch Spannvorrichtung zur befestigung eines aufzuges am zylinder einer rotationsdruckmaschine
US5329853A (en) * 1992-04-01 1994-07-19 Man Roland Druckmaschinen Ag Blanket clamping device
US5809889A (en) * 1994-07-16 1998-09-22 Koenig & Bauer-Albert Aktiengesellschaft Process and device for securing and tightening a packing on the cylinder of a rotary printing machine

Families Citing this family (2)

* 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
DE4210772C2 (de) * 1992-04-01 1994-03-24 Roland Man Druckmasch Gummituchspannung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1545791A (en) * 1925-03-28 1925-07-14 Owen Malcolm Printing cylinder
US2209127A (en) * 1938-12-19 1940-07-23 United Autographic Register Co Apparatus for attaching printing plates to a cylinder
GB925330A (en) * 1961-11-14 1963-05-08 Miehle Goss Dexter Inc Blanket lockup arrangement
FR2179279A5 (de) * 1972-04-04 1973-11-16 Marinoni

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1545791A (en) * 1925-03-28 1925-07-14 Owen Malcolm Printing cylinder
US2209127A (en) * 1938-12-19 1940-07-23 United Autographic Register Co Apparatus for attaching printing plates to a cylinder
GB925330A (en) * 1961-11-14 1963-05-08 Miehle Goss Dexter Inc Blanket lockup arrangement
FR2179279A5 (de) * 1972-04-04 1973-11-16 Marinoni

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3707066A1 (de) * 1987-03-05 1988-09-15 Roland Man Druckmasch Spannvorrichtung zur befestigung eines aufzuges am zylinder einer rotationsdruckmaschine
US5329853A (en) * 1992-04-01 1994-07-19 Man Roland Druckmaschinen Ag Blanket clamping device
US5809889A (en) * 1994-07-16 1998-09-22 Koenig & Bauer-Albert Aktiengesellschaft Process and device for securing and tightening a packing on the cylinder of a rotary printing machine

Also Published As

Publication number Publication date
FR2527983A1 (fr) 1983-12-09
FR2527983B1 (fr) 1986-06-06
EP0099275B1 (de) 1986-04-16
DE3363041D1 (en) 1986-05-22

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