US3658002A - Clamping device for clamping a printing plate upon a cylinder of a printing press - Google Patents

Clamping device for clamping a printing plate upon a cylinder of a printing press Download PDF

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Publication number
US3658002A
US3658002A US28581A US3658002DA US3658002A US 3658002 A US3658002 A US 3658002A US 28581 A US28581 A US 28581A US 3658002D A US3658002D A US 3658002DA US 3658002 A US3658002 A US 3658002A
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US
United States
Prior art keywords
bearing elements
jaw
bar
tensioning
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.)
Expired - Lifetime
Application number
US28581A
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English (en)
Inventor
Friedrich Preuss
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.)
Roland Offsetmaschinenfabrik Faber and Schleicher AG
Original Assignee
Roland Offsetmaschinenfabrik Faber and Schleicher 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 Roland Offsetmaschinenfabrik Faber and Schleicher AG filed Critical Roland Offsetmaschinenfabrik Faber and Schleicher AG
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Publication of US3658002A publication Critical patent/US3658002A/en
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Expired - Lifetime 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
    • B41F27/1231—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 tangential to support surface

Definitions

  • ABSTRACT A device for clamping a printing plate to a cylinder such as the form cylinder of a printing press or similar machine permits convenient and rapid pivotal mounting of the clamping jaw to the tensioning bar of the device and an equally convenient and rapid release therefrom.
  • the jaw and the tensioning bar are hinged to each other by a plurality of lengthwise spaced bearing elements and these elements engage each other in one axial position of the jaw and the bar relative to each other while injanother axial position the bearing elements on the jaw face the spaces between the bearing elements on the bar whereby the jaw can be released from the bar by lifting it in radial direction.
  • Mounting of the clamping jaw on the bar is effected by reversing the described relative displacement of the jaw and the bar.
  • Printing press cylinders of the kind here involved generally have lengthwise peripheral grooves.
  • clamp ing devices of the general kind above referred to in which a tensioning bar is mounted in each of these grooves lengthwise therein and a clamping jaw hinged to the tensioning bar can be pivoted by an eccentric means into and out of a position.
  • a clamping device of this kind is to secure the printing plate upon predetermined areas of the peripheral wall of the cylinder.
  • Clamping devices of this kind should require a minimum of space to retain a maximal peripheral area for the printing plate to be clamped. It is also required that the device is readily accessible and can be conveniently serviced, as obviously the device being mounted on the cylinder is bound to come in contact with ink, moisture and cleaning fluids.
  • U.S. Pat. No. 3,156,184 discloses a clamping device of the general kind above referred to in which the pivotal connection between the tensioning bar and the clamping jaw is effected by a plurality of ball joints mounted along the tensioning bar.
  • the heads of screws screwed into the tensioning bars are spherically formed and thus serve as the balls of the joints.
  • the clamping jaw and the tensioning bar can be detached from each other only when and after all these screws are removed from the tensioning bar. Such an operation is obviously cumbersome and time-consuming.
  • a further reason why the described hinging of the clamping jaw to the tensioning bar is not economically acceptable is that the screws when inserted must be carefully adjusted so that the ball heads thereof are all at the same level, as otherwise the joints could not function smoothly.
  • French Pat. No. 1,044,012 shows a clamping device in which the printing plate to be mounted has reinforced ends each formed with a notched or serrated profile which cooperates with a similarly shaped profile formed in a bar of the device.
  • the profiled ends of the plate and the bar can be joined to or separated from each other by lengthwise displacing the bar. There are no provisions for a pivotal connection between the bar and the respective profiled plate end.
  • Another important object of the invention is to provide a novel and improved clamping device of the general kind above referred to in which the clamping jaw can be rapidly and easily pivotally connected to the tensioning bar of the device and equally easily and rapidly removed from the tensioning bar.
  • Another important object of the invention is to provide a novel and improved clamping device of the general kind above referred to in which coupling and separation, respectively, of the clamping jaw and the tensioning bar of the device are effected by simply axially displacing the clamping jaw and the tensioning bar relative to each other.
  • a clamping device including a tensioning bar which is adjustably retained in its axial position in the groove and is also displaceable in circumferential direction.
  • the clamping jaw of the device is pivotally connectable to the tensioning bar by hinge means which include a plurality of axially spaced bearing elements on the tensioning bar and a corresponding plurality of axially spaced bearing elements on the clamping jaw.
  • These bearing elements are in pivotal engagement with each other in one axial position of the clamping jaw with reference to the tensioning bar and clear of each other in another axial position of the clamping jaw with reference to the tensioning bar. In the latter position the clamping jaw can be simply lifted out of the tensioning bar.
  • the spaces between adjacent bearing elements on the tensioning bar member are axially wider than the axial length of the bearing elements on the clamping jaw so that the clamping jaw and the tensioning bar can be easily separated by placing the bearing elements on the jaw in registry with the spaces between the bearing elements on the bar and then lifting the jaw out of the bar. Joining of the jaw and the bar is effected by placing the jaw and the bar into an axial position relative to each other in which the bearing elements are in registry.
  • the structure of the clamping device according to the invention reduces to a minimum the space requirement thereof in circumferential direction; in other words, the device presents an optimal solution of the problem.
  • the device permits convenient access-and without requiring the use of a tool-to parts of the device which are covered by the clamping jaw in devices of the type as heretofore known. Access is, for instance, necessary to the usual roughened or profiled surfaces of the device between which the ends of the printing plate are actually clamped.
  • a clamping jaw which is specifically designed for the type of printing plate to be used, such as a plate made of zinc or a metal alloy. As is evident, exchange of the clamping jaws is very convenient with the clamping device of the invention.
  • FIG. I is a sectional elevational view of a clamping device according to the invention taken on line H of FIG. 2;
  • FIG. 2 is a plan view of FIG. 1 on a reduced scale
  • FIG. 3 is a side view of FIG. 2;
  • FIG. 4 is a detailed view of the clamping jaw of the device
  • the clamping device comprises a tensioning bar 6 which extends lengthwise in the groove and is displaceable transverse of its length, that is, in the circumferential direction of the peripheral wall of the cylinder by turning a screw 7 against the action of a spring 8 (see FIG. 2).
  • the bar is guided by a guide track 9 (see FIG. 3), which is fixedly secured to the body of the cylinder and extends approximately in circumferential direction.
  • Guide 9 is engageable with a notch 10 in bar 6.
  • the position of the bar in the direction of the cylinder axis is adjustable by a set screw 11 threadable into the bar at the respective end thereof. The set screw abuts against the body of the cylinder.
  • Tension bar 6 has a lengthwise extending and upwardly protruding rib 12 (see FIGS. 5 and 7) along which several spaced apart generally hook-shaped protrusions 13 are provided.
  • a clamping jaw 14 of the device also has a lengthwise rib 15 along which several generally hook-shaped protrusions 16 are formed, as best shown in FIGS. 4 and 6.
  • Protrusions 13 on bar 6 and protrusions 16 on jaw 14 constitute pivotally engageable bearing elements which are held in engagement by the action of a loaded spring 17 (see FIG. 1) abutting against tension bar 6.
  • the spring is guided in a bore 18 of bar 6 and acts upon jaw 14 by means of a strip 19 fixedly secured to the jaw.
  • jaw 14 constitutes in effect a two-armed lever, the fulcrum of which is at axis 20.
  • the two arms of this lever are designated by 21 and 26.
  • a rod 23 of eccentric cross section is interposed between lever arm 21 and tension bar 6 and a support strip 22 steadies the rod in position, as shown in FIG. 1.
  • Rod 23 can be rotated about its axis by means of screws 24 at the end of the rod, as is best shown in FIG. 2. Rotation of the rod effects rotation of clamping jaw 14 about its fulcrum 20 against the action of spring 17.
  • Rod 23 may be steadied in position by holders 25, suitably secured, for instance by screws, to tension bar 6.
  • Member 27 may constitute a portion of tension bar 6.
  • a rod 28 of for instance rectangular cross section is interposed between member or bar portion 27 and the main body of tension bar 6. This rod engages with two opposite corners generally triangular notches or grooves 29 and 30 formed in member 27 and tension bar 6, respectively and so shaped that the bar will slightly tilt about its corners in response to a tensioning pull applied to plate end 4, that is, a pull toward the left as shown in FIG. 1.
  • FIGS. 6 and 7 The convenience with which the clamping jaw 14 can be as- :membled on a device according to the invention and disassembled therefrom can best be apprehended by an inspection of FIGS. 6 and 7.
  • clamping jaw 14 is shown in a position with reference to the position of the tension bar 6 such that bearing elements 16 are in alignment with the gaps 13a between bearing elements 13.
  • FIGS. 6 and 7 show that the spaces between bearing elements 13 are axially wider than the axial widths of bearing elements 16 so that it is not necessary to place the bearing element 16 in perfectly centered alignment with spaces 13a.
  • Tension bar 6 is formed with a recess 32 to accommodate strip 19.
  • This strip is so dimensioned and shaped that it is in contact with spring 17 when and while the clamping jaw is inserted into tension bar 6 and also when the jaw is axially displaced relative to bar 6. Accordingly, the respective end portion of strip 19 is always overlying bore 18 so that the loaded spring therein cannot jump out of the bore.
  • FIGS. 2, 3, 6 and 7 show only one end of the clampingdevice, the other endthereof being constructed correspondingly.
  • hinge means supporting said jaw member on the tensioning member parallel therewith for selectively pivoting said jaw member into and out of a pivotal position in which a printing plate end is clamped between said members
  • said hinge means including a plurality of axially spaced bearing elements supported by the tensioning member and a corresponding plurality of axially spaced bearing elements supported on the jaw member, a first axial displacement of the jaw member moving the bearing elements on said member into registry with the spaces between the bearing elements on the tensioning member, a subsequent circumferential displacement of the tensioning member, with the bearing elements on the jaw member in said position of registry, moving the bearing elements on the tensioning member into lengthwise alignment with the bearing elements on the jaw member and a second axial displacement of the jaw member moving the bearing elements on said member into hinging relationship with the bearing elements on the tensioning member.
  • actuating means for selectively pivoting the jaw member into either one of said pivotal positions
  • said actuating means including an elongate eccentric member interposed between the tensioning member and the jaw member, said eccentric member being rotatable about its axis and in engagement with said members whereby rotation of said eccentric member pivots the jaw member into and out of its clamping position respectively and retains the jaw member in the selected one of said positions.
  • said tensioning member comprises a yielding axially elongate portion engageable with the printing plate and to be clamped and disposed juxtaposed to the clamping jaw member, and wherein a bar of .polygonal cross section is interposed in a gap between said yielding portion and a rigid portion of the tensioning member, said bar in response to a circumferential displacement of the tensioning member being tilted about its axis into an angular position in which the effective cross section width of the bar with respect to said gap is increased, thereby pressing said yielding portion of the tensioning member toward said jaw member.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US28581A 1969-05-03 1970-04-15 Clamping device for clamping a printing plate upon a cylinder of a printing press Expired - Lifetime US3658002A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1922749A DE1922749C3 (de) 1969-05-03 1969-05-03 Vorrichtung zur Befestigung einer Druckplatte auf dem Formzylinder einer Druckmaschine

Publications (1)

Publication Number Publication Date
US3658002A true US3658002A (en) 1972-04-25

Family

ID=5733236

Family Applications (1)

Application Number Title Priority Date Filing Date
US28581A Expired - Lifetime US3658002A (en) 1969-05-03 1970-04-15 Clamping device for clamping a printing plate upon a cylinder of a printing press

Country Status (6)

Country Link
US (1) US3658002A (de)
CH (1) CH500070A (de)
DE (1) DE1922749C3 (de)
FR (1) FR2046353A5 (de)
GB (1) GB1240965A (de)
SE (1) SE375486B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903796A (en) * 1973-03-01 1975-09-09 Heidelberger Druckmasch Ag Means for clamping on flexible printing plates
US4010685A (en) * 1974-06-28 1977-03-08 Roland Offsetmaschinenfabrik Faber & Schleicher Ag Printing plate clamping device
US4688484A (en) * 1985-05-09 1987-08-25 M.A.N. Roland Druckmashchinen Aktiengesellschaft Mechanism for the parallel clamping of printing plates on the plate cylinder of printing machines
US5325778A (en) * 1992-04-30 1994-07-05 Man Roland Druckmaschinen Ag Device for clamping and tensioning printing plates
US5503073A (en) * 1993-12-04 1996-04-02 Heidelberger Druckmaschinen Ag Device for fastening a form to a cylinder of a finishing unit
US6354206B1 (en) * 1999-01-18 2002-03-12 Heidelberger Druckmaschinen Ag Printing machine cylinder and clamping device for firmly clamping a cylinder packing
WO2004024450A1 (de) * 2002-09-06 2004-03-25 Kba-Giori S.A. Klemmvorrichtung für eine druckplatte

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284074A (en) * 1939-07-01 1942-05-26 John M Stahl Adjustable jamb for shower stall doors
US2767653A (en) * 1952-05-16 1956-10-23 Babicz George Blanket cylinder construction for printing machines
US2775198A (en) * 1953-08-27 1956-12-25 Harris Seybold Co Plate clamp
US3119331A (en) * 1961-08-10 1964-01-28 Roland Offsetmaschf Clamping device for clamping printing plates of printing machines
US3156184A (en) * 1962-02-20 1964-11-10 Harris Intertype Corp Plate clamp
US3242523A (en) * 1963-01-02 1966-03-29 Sperry Rand Corp Spiral hinge
DE1291750B (de) * 1967-07-29 1969-04-03 Roland Offsetmaschf Vorrichtung zum Befestigen einer biegsamen Druckplatte auf dem Formzylinder einer Rotationsdruckmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284074A (en) * 1939-07-01 1942-05-26 John M Stahl Adjustable jamb for shower stall doors
US2767653A (en) * 1952-05-16 1956-10-23 Babicz George Blanket cylinder construction for printing machines
US2775198A (en) * 1953-08-27 1956-12-25 Harris Seybold Co Plate clamp
US3119331A (en) * 1961-08-10 1964-01-28 Roland Offsetmaschf Clamping device for clamping printing plates of printing machines
US3156184A (en) * 1962-02-20 1964-11-10 Harris Intertype Corp Plate clamp
US3242523A (en) * 1963-01-02 1966-03-29 Sperry Rand Corp Spiral hinge
DE1291750B (de) * 1967-07-29 1969-04-03 Roland Offsetmaschf Vorrichtung zum Befestigen einer biegsamen Druckplatte auf dem Formzylinder einer Rotationsdruckmaschine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903796A (en) * 1973-03-01 1975-09-09 Heidelberger Druckmasch Ag Means for clamping on flexible printing plates
US4010685A (en) * 1974-06-28 1977-03-08 Roland Offsetmaschinenfabrik Faber & Schleicher Ag Printing plate clamping device
US4688484A (en) * 1985-05-09 1987-08-25 M.A.N. Roland Druckmashchinen Aktiengesellschaft Mechanism for the parallel clamping of printing plates on the plate cylinder of printing machines
US5325778A (en) * 1992-04-30 1994-07-05 Man Roland Druckmaschinen Ag Device for clamping and tensioning printing plates
US5503073A (en) * 1993-12-04 1996-04-02 Heidelberger Druckmaschinen Ag Device for fastening a form to a cylinder of a finishing unit
US6354206B1 (en) * 1999-01-18 2002-03-12 Heidelberger Druckmaschinen Ag Printing machine cylinder and clamping device for firmly clamping a cylinder packing
WO2004024450A1 (de) * 2002-09-06 2004-03-25 Kba-Giori S.A. Klemmvorrichtung für eine druckplatte
CN100340400C (zh) * 2002-09-06 2007-10-03 卡巴-乔利有限公司 用于印刷板的夹紧装置
US7640855B2 (en) 2002-09-06 2010-01-05 Kba-Giori S.A. Clamping device for a printing plate

Also Published As

Publication number Publication date
DE1922749C3 (de) 1974-05-16
CH500070A (de) 1970-12-15
DE1922749A1 (de) 1971-02-18
FR2046353A5 (de) 1971-03-05
DE1922749B2 (de) 1973-10-18
SE375486B (de) 1975-04-21
GB1240965A (en) 1971-07-28

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