US3903796A - Means for clamping on flexible printing plates - Google Patents

Means for clamping on flexible printing plates Download PDF

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Publication number
US3903796A
US3903796A US442133A US44213374A US3903796A US 3903796 A US3903796 A US 3903796A US 442133 A US442133 A US 442133A US 44213374 A US44213374 A US 44213374A US 3903796 A US3903796 A US 3903796A
Authority
US
United States
Prior art keywords
clamping
rail
clamping rail
screws
pairs
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
US442133A
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English (en)
Inventor
Willie Jeschke
Claus-Peter Zander
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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
Priority claimed from DE19732310228 external-priority patent/DE2310228C3/de
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Application granted granted Critical
Publication of US3903796A publication Critical patent/US3903796A/en
Anticipated expiration legal-status Critical
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
    • 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
    • B41F27/005—Attaching and registering printing formes to supports

Definitions

  • Two or more tandem-mounted clamping rail pairs each consisting of top and bottom clamping rails are mounted in the axial direction of the cylinders.
  • the rails clamp the ends of the printing plate by means of clamping screws and tension the plate with the aid of tensioning screws.
  • the rails are supported in relation to one another and at the cylinder end flanges by means of adjusting screws.
  • the top clamping rail of a clamping rail pair overlaps the bottom of clamping rail of the adjacent clamping rail pair.
  • the overlapping clamping rail ends are clamped together by at least one clamping screw passed through slots.
  • Two or more pairs of clamping rails are provided, consisting in each case of top and bottom clamping rails, located behind one another in axial direction of the cylinders. These pairs of clamping rails clamp the end of the printing plate by means of clamping screws and tension it with the aid of tensioning screws and are supported in relation to one another and onthe cylinder end flanges by means of adjusting screws.
  • German patent specification No. l,23l,259 two pairs of clamping rails are provided at the tail end of the printing plate, these being adjustable in the axial direction of the cylinder by means of adjusting screws. 1n the case of multicolor printing it is a generally known process to remedy register inaccuracies of consecutive, different colored impression by deforming the rear end of the printing plate. This deformation is caused by altering the spacing of the pairs of clamping rails in relation to one another with the aid of adjusting screws.
  • the purpose of the invention is to clamp the printing plates in true register.
  • the printing plates should be adjustable or deformable by means of the clamping rails on the tail end so that the subsequent colors are applied true to register in spite of alteration of the print images.
  • a principal object of the invention is to permit deformation of the printing plate at the tail end without splitting of the printing plate occurring during the run.
  • Another object of the invention is to provide new and improved clamping means for printing plates.
  • Another object of the invention is to provide new and improved clamping means for printing plates having clamping rails for the plate, said rails being adjustable axially and sideways.
  • Another object of the invention is to provide new and improved clamping means for printing plates having means to apply tension to the printing plates.
  • the present invention consists of the top clamping rail of a clamping rail pair overlapping the bottom clamping rail of the adjacent clamping rail pair and in the overlapping clamping rail ends being lockable to one another by means of at least one clamping screw passed through slots.
  • the advantage of overlapping arrangement of the clamping rail pairs is that the range of extension is considerably greater than in the case of the known clamping devices as the clamping screws in the area of overlap are released during deformation of the rear edge of the printing plate. During compression no ridge can form because the overlapping clamping rail ends are applied again for clamping the printing plate ends after deformation.
  • the invention provides the advantage that both pairs of clamping rails are axially adjustable in the same way as a single clamping rail pair as a result of the connection of two overlapped clamping rail ends.
  • FIG. 1 is a plan view of a cylinder with aplate clamping device in accordance with the invention
  • FIG. 2 is a longitudinal section through the cylinder of FIG. 1, and
  • FIG. 3 is a cross-section through the same cylinder at lines 33 of FIG. 1.
  • Cylinder 1 has, between the two cylinder end flanges 2 and 3 having the form of a bearer ring a slot or passage 4 in which the clamping device for printing plate 5 is accommodated in the usual way.
  • the plate leading end 6 of the printing plate 5 is held in position by a continuous pair of clamping rails which consists of the bottom clamping rail 7 and the top clamping rail 8. Both clamping rails 7 and 8 are joined together by clamping screws 9.
  • the bottom clamping rail 7 is movably located in slot passage 4 and is adjustable in axial direction of the form cylinder by means of adjusting screws 13 and at right angle thereto in slot passage 4 by means of tensioning screws 14.
  • T-shaped hold-down screw assemblies 15 which are inserted in suitably shaped slots 16 in the bottom clamping rails.
  • the size of the slots 16 is such that axial movement of the pairs of rails is possible by screws 13.
  • plate 5 is held in position by two pairs of clamping rails mounted behind one another in axial direction of form cylinder 1.
  • One pair of clamping rails has a bottom clamping rail 17 projecting past the machine center 24 and a considerably shorter top clamping rail 18.
  • the other pair of clamping rails consist of a shorter bottom clamping rail 19 and a top clamping rail 20 projecting past the machine center 24.
  • the bottom clamping rail 17 of one clamping rail pair 17 and 18 is overlapped by the top clamping rail 20 of the other clamping rail pair 19 and 20.
  • the two overlapping clamping rail ends are joined together by two clamping screws 9'. In contrast to the other clamping screws 9 of the two clamping rail pairs I7, 18 and 19, 20 these screws 9 are located in slots 21.
  • the overlapping clamping rail ends can thus be moved in relation to one another. If the two center clamping screws 9' are tightened, the two clamping rail pairs l7, l8 and 19, 20, form one unit and can be adjusted together by means of the outer adjusting screws 13 in axial direction of the cylinder 1 or by means of the tensioning screws 14 in direction of tension.
  • Each of the two bottom clamping rails 17 and 19 has a slot 16 into which a hold-down projects in each case.
  • a central adjusting screw 23 is provided by means of which the two clamping rail pairs 17, 18 and 19, 20, can be moved away from one another by slackening the two center clamping screws 9' or moved closer to one another with the aid of the two outer adjusting screws.
  • the machine operator establishes during multicolor printing that one of the printing plates 5 is not printing true to register, that is to say, applies the print image wider or narrower, he can correct this fault with the aid of the invention by slackening the two central clamping screws 9' and adjusting the three adjusting screws 13 and 23 in such a way that according to the nature of the deviation, whether printing is narrower or wider, the center section of the printing plate end can be compressed or extended.
  • the deformation section is then at least as large as the overlap of the clamping rails. Ridge formation in the center plate section or excessive extension is thus prevented.
  • the central clamping screws 9' are retightened.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US442133A 1973-03-01 1974-02-13 Means for clamping on flexible printing plates Expired - Lifetime US3903796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732310228 DE2310228C3 (de) 1973-03-01 Vorrichtung zum Aufspannen biegsamer Druckplatten

Publications (1)

Publication Number Publication Date
US3903796A true US3903796A (en) 1975-09-09

Family

ID=5873521

Family Applications (1)

Application Number Title Priority Date Filing Date
US442133A Expired - Lifetime US3903796A (en) 1973-03-01 1974-02-13 Means for clamping on flexible printing plates

Country Status (11)

Country Link
US (1) US3903796A (de)
JP (1) JPS5224881B2 (de)
AT (1) AT324361B (de)
CH (1) CH560103A5 (de)
CS (1) CS181751B2 (de)
DD (1) DD109571A5 (de)
FR (1) FR2219847B1 (de)
GB (1) GB1432735A (de)
IT (1) IT996994B (de)
NL (1) NL149746B (de)
SE (1) SE387071B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994224A (en) * 1975-06-09 1976-11-30 Newspaper Equipment Company Mounting structure for printing plates
US4641577A (en) * 1985-04-12 1987-02-10 Sweeny Peter K Apparatus for adjusting the plate segment of an off-set lithographic printer
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
US4712476A (en) * 1986-02-27 1987-12-15 Heidelberger Druckmaschinen Ag Device for securing flexible printing plates under tension on a plate cylinder of a rotary printing machine
US4831931A (en) * 1987-08-25 1989-05-23 Heidelberger Druckmaschinen Aktiengesellschaft Device for tensioning a flexible printing plate on a plate cylinder of a rotary printing machine
US5347928A (en) * 1992-10-29 1994-09-20 Sakurai Graphic Systems Corporation Plate clamping unit for offset press
US5415096A (en) * 1991-09-20 1995-05-16 Heidelberger Druckmaschinen Ag Device for correcting trapezoidal register deviations
USRE35647E (en) * 1992-04-02 1997-11-04 Man Roland Druckmaschinen Ag Plate cylinder holder with slide rail circular bearing assembly
US5922406A (en) * 1996-10-11 1999-07-13 Ludford, Iii; Robert E. Coating method and apparatus
US11945210B2 (en) * 2020-09-04 2024-04-02 Kolbus Gmbh & Co. Kg Device for mounting a sheet-like roller cover on a roller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3728263A1 (de) * 1986-02-27 1989-03-09 Heidelberger Druckmasch Ag Vorrichtung zum aufspannen von biegsamen druckplatten auf dem plattenzylinder von rotationsdruckmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151553A (en) * 1961-04-11 1964-10-06 Harris Intertype Corp Plate cylinder with plate clamps
US3154012A (en) * 1961-05-25 1964-10-27 Maschf Augsburg Nuernberg Ag Means for registering printing plates
US3156184A (en) * 1962-02-20 1964-11-10 Harris Intertype Corp Plate clamp
US3557695A (en) * 1967-07-29 1971-01-26 Roland Offsetmaschf Device for the fastening of a printing plate
US3583318A (en) * 1967-04-12 1971-06-08 H W Crabtree & Sons Ltd Printing plate clamping means
US3658002A (en) * 1969-05-03 1972-04-25 Roland Offsetmaschf Clamping device for clamping a printing plate upon a cylinder of a printing press

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151553A (en) * 1961-04-11 1964-10-06 Harris Intertype Corp Plate cylinder with plate clamps
US3154012A (en) * 1961-05-25 1964-10-27 Maschf Augsburg Nuernberg Ag Means for registering printing plates
US3156184A (en) * 1962-02-20 1964-11-10 Harris Intertype Corp Plate clamp
US3583318A (en) * 1967-04-12 1971-06-08 H W Crabtree & Sons Ltd Printing plate clamping means
US3557695A (en) * 1967-07-29 1971-01-26 Roland Offsetmaschf Device for the fastening of a printing plate
US3658002A (en) * 1969-05-03 1972-04-25 Roland Offsetmaschf Clamping device for clamping a printing plate upon a cylinder of a printing press

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994224A (en) * 1975-06-09 1976-11-30 Newspaper Equipment Company Mounting structure for printing plates
US4641577A (en) * 1985-04-12 1987-02-10 Sweeny Peter K Apparatus for adjusting the plate segment of an off-set lithographic printer
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
US4712476A (en) * 1986-02-27 1987-12-15 Heidelberger Druckmaschinen Ag Device for securing flexible printing plates under tension on a plate cylinder of a rotary printing machine
US4831931A (en) * 1987-08-25 1989-05-23 Heidelberger Druckmaschinen Aktiengesellschaft Device for tensioning a flexible printing plate on a plate cylinder of a rotary printing machine
US5415096A (en) * 1991-09-20 1995-05-16 Heidelberger Druckmaschinen Ag Device for correcting trapezoidal register deviations
USRE35647E (en) * 1992-04-02 1997-11-04 Man Roland Druckmaschinen Ag Plate cylinder holder with slide rail circular bearing assembly
US5347928A (en) * 1992-10-29 1994-09-20 Sakurai Graphic Systems Corporation Plate clamping unit for offset press
US5922406A (en) * 1996-10-11 1999-07-13 Ludford, Iii; Robert E. Coating method and apparatus
US11945210B2 (en) * 2020-09-04 2024-04-02 Kolbus Gmbh & Co. Kg Device for mounting a sheet-like roller cover on a roller

Also Published As

Publication number Publication date
FR2219847A1 (de) 1974-09-27
IT996994B (it) 1975-12-10
DE2310228B2 (de) 1975-07-24
SE387071B (sv) 1976-08-30
NL149746B (nl) 1976-06-15
JPS49118506A (de) 1974-11-13
AT324361B (de) 1975-08-25
DE2310228A1 (de) 1974-09-05
NL7400151A (de) 1974-09-03
GB1432735A (en) 1976-04-22
CH560103A5 (de) 1975-03-27
DD109571A5 (de) 1974-11-12
JPS5224881B2 (de) 1977-07-04
CS181751B2 (en) 1978-03-31
FR2219847B1 (de) 1976-06-25

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