US2910939A - Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing - Google Patents

Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing Download PDF

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Publication number
US2910939A
US2910939A US743585A US74358558A US2910939A US 2910939 A US2910939 A US 2910939A US 743585 A US743585 A US 743585A US 74358558 A US74358558 A US 74358558A US 2910939 A US2910939 A US 2910939A
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US
United States
Prior art keywords
cylinder
groove
rails
printing
machines
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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
US743585A
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English (en)
Inventor
Mosegaard Marius
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.)
ALLER PRESS AS
Original Assignee
ALLER PRESS AS
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Filing date
Publication date
Application filed by ALLER PRESS AS filed Critical ALLER PRESS AS
Application granted granted Critical
Publication of US2910939A publication Critical patent/US2910939A/en
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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
    • B41F27/125—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 on a curvilinear path, e.g. by winding on a roll
    • 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

  • This invention relates to a mechanism for clamping flexible printing plates to the plate cylinder of machines, particularly high-speed rotary machines, for flat printing, preferably offset printing, wherein the ends of the printing plate are connected to two rails or lists which are received in an axially extending recess or groove in the circumferential surface of the cylinder.
  • Such mechanisms have been made in many different ways. It has been suggested to place wedge pieces behind the lists, which wedges cooperate with inclined surfaces in the cylinder recess and press against the rear sides of the lists so as to move same in tangential direction during the tightening of the printing plate.
  • the wedge pieces may e.g. be influenced by means of screws, which are placed radially inthe cylinder recess and force the wedge pieces outwards.
  • Such a mechanism has proved expedient in practice, although the construction becomes rather complicated.
  • a' more simple construction is obtained by placing transversely of the rails a number of shafts, each of which is mounted in bores in both rails and carries an adjusting disc in the slot between the rails, the ends of the shafts cooperating with the walls limiting the groove or recess so that by turning the shafts the rails can be adjusted indifferent directions within the space confined by the walls of the groove.
  • Figures 1 and 2 show an axial section through a plate cylinder for a rotary machine, taken at the circumference centrally through the groove which receives said mechanism, said section extending through half the length of the cylinder only,
  • Figures 3 and 4 show on a larger scale part of the mechanism as seen from the outer side of the cylinder
  • Figures 5 and 6 are a section of same along a plane perpendicular to an axial plane through the center of the groove, and
  • Figures 7, 8, 9 and 10 show on a larger scale sections along the lines IV--IV, V-V, VIVI, and VIIVII, respectively, in Figure 2.
  • two rails 30 and 32 are disposed, which in the outward direction towards the surface of the cylinder are wedge-shaped by means of inclined surfaces 34, Figure 10, extending from their side facing outwards towards their side facing inwards in the same direction as the appertaining inclined surfaces 24.
  • the rails 30 and 32 serve to fasten the ends of a flexible plate 36 which consists of suitable metal, e.g. stainless steel, and which constitutes the printing plate.
  • edges 40 of the plate 36 For attaching the edges 40 of the plate 36 to the rails 30 and 32 these latter have on their surfaces facing each other narrow axially extending grooves 38 which receive the bent edges 44 of the printing plate which is bent also at the circumference of the plate cylinder and extends inwardly through the slit 28 to the grooves 38.
  • a number of adjusting discs 42 are used, which are so thin that they can be received'in the narrow slit between said rails, and which at either side have shafts 44 disposed in continuation of each other.
  • the disc and the shafts are preferably integral.
  • the said discs are distributed throughout the length of.
  • the shafts 44 are mounted in bores, in both rails 30 and 32, but in different ways so as to serve different purposes, as will appear from the following. Three different type are provided, A, B, and C, shown in Figures 7, 9 and 8, respectively.
  • the left-side shaft 44 has screw threads 46, which cooperate with corresponding screw threads in the rail 30, whereas the right-side shaft is smooth and is received in a corresponding smooth bore in the rail 32.
  • the end faces of the two shafts 44 abut against abutment pieces 43, which are inserted in corresponding recesses in the bars 16.
  • Type B shown in Figure 9, is identical with type A, the only difference being that it is the right-side shaft 44 which is provided with screw threads 46 cooperating with screw threads in the rail 32, whereas the other shaft is smooth. This makes it possible to adjust this rail to the right and to the left by turning the disc 42.
  • both shafts 44 are smooth and mounted in smooth bores in the rails 30 and 32, see Figure 8.
  • both shafts have eccentric journals 50, which are received in bores in slide blocks 52 being displaceable in short axially extending grooves 54 in the bars 16, see Figures 5 and 6.
  • both rails 30 and 32 can be displaced downwardly from the position shown in Figures 1-2 and 8 eccentricity of the journals 50 in relation to the shafts 44.
  • the blocks 52 reciprocate slightly in the grooves 54.
  • each group of adjusting means the various types are placed in the succession shown in Figures 5 and 6 with type A and type B being closely juxtaposed at either end of the group, and type C being found at the center of the group.
  • the rails 30 and 32 respectively, and consequently the edges of the printing plate 36 can be adjusted to either side, so that it is possible to obtain an exact registration.
  • a tightening of the printing plate can be obtained.
  • the final tightening of this plate is effected with the adjusting means of type C by simultaneous lowering of the rails 30 and 32, whereby it is also ensured that no parts will protrude at the mouth of the slit 28.
  • the adjusting discs 42 are provided at their circumference with notches 56, so that they can be turned by means of a hook spanner, not shown, which is introduced through the slit 2%.
  • a plate cylinder for rotary printing machines comprising a pair of groove defining walls extending axially of said cylinder and substantially parallel to a plane through the axis of said cylinder, printing plate clamping means arranged within said groove, a printing plate mounted on the cylindrical surface of said cylinder and having axially extending edges to be secured by said clamping means within said groove, an adjustment device for adjusting the relative position of said clamping means being provided within said groove between said clamping means, said adjustment device including a plurality of discs rotatable with shafts supported by said clamping means, alternative ends of said shafts being threaded to cooperate with threads in association with one or other of said clamping means, and at least one disc formed with a smooth shaft penetrating through said clamping means and terminating in journals being eccentric in relation to the shaft, bearings for said journals being provided in the walls of the groove extending axial at the surface of the plate cylinder, said bearings being axially slidable.
  • a plate cylinder for rotary printing machines comprising parallel walls defining an axially extending
  • adjustable rails within said groove being spaced to leave a gap therebetween, a flexible printing plate including edges extending into said gap, clamping means provided on said rails facing said gap and arranged to secure said printing plate edges, adjusting devices associated with said rails for radial and peripheral adjustment thereof, said adjusting devices each comprising a disc mounted within said gap with a disc-carrying shaft extending normal to the axial direction and to the radius of said plate cylinder, the ends of said shaft being eccentrically offset in relation to the shaft proper, and bearings for said offset shaft ends provided in the groovedeiining walls so as to allow for a limited movement of the bearings in response to adjustment of the rails.
  • a plate cylinder for rotary printing machines comprising a pair of groove-defining walls extending axially of said cylinder and substantially parallel to a plane through the axis of said cylinder, printing plate clamping means arranged within said groove, a printing plate mounted on the cylindrical surface of said cylinder and having axially extending edges to be secured by said clamping means within said groove, an adjustment device for adjusting the relative position of said clamping means being provided within said groove between said clamping means, said adjustment device including a plurality of discs rotatable with shafts supported by said clamping means, alternative ends of said shafts being threaded to cooperate with threads in association with one or other of said clamping means, and at least one disc formed with a smooth shaft penetrating through said clamping means and terminating in journals being eccentric in relation to the shaft, bearings for said journals beingv provided in the walls of the groove extending axial at the surface of the plate cylinder.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US743585A 1957-07-04 1958-06-23 Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing Expired - Lifetime US2910939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK851908X 1957-07-04

Publications (1)

Publication Number Publication Date
US2910939A true US2910939A (en) 1959-11-03

Family

ID=8153300

Family Applications (1)

Application Number Title Priority Date Filing Date
US743585A Expired - Lifetime US2910939A (en) 1957-07-04 1958-06-23 Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing

Country Status (9)

Country Link
US (1) US2910939A (fr)
BE (1) BE568959A (fr)
CA (1) CA635929A (fr)
DE (1) DE1121072B (fr)
FR (1) FR1197554A (fr)
GB (1) GB851908A (fr)
IT (1) IT592349A (fr)
NL (1) NL229234A (fr)
NO (1) NO96575A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998768A (en) * 1958-12-22 1961-09-05 Carl Allers Ets Mechanism for clamping flexible printing plates
US3011437A (en) * 1959-01-31 1961-12-05 Aller Press As Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813777A1 (de) * 1988-04-23 1989-11-02 Roland Man Druckmasch Spanneinrichtung zum befestigen einer biegsamen folie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US537698A (en) * 1895-04-16 Jules michaud
US2386214A (en) * 1942-10-09 1945-10-09 Harris Seybold Potter Co Plate clamp
GB756225A (en) * 1952-11-24 1956-09-05 Crabtree & Sons Ltd R Improvements in plate-holding arrangements for use on printing machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1730122A (en) * 1926-07-10 1929-10-01 Hoe Corp Printing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US537698A (en) * 1895-04-16 Jules michaud
US2386214A (en) * 1942-10-09 1945-10-09 Harris Seybold Potter Co Plate clamp
GB756225A (en) * 1952-11-24 1956-09-05 Crabtree & Sons Ltd R Improvements in plate-holding arrangements for use on printing machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998768A (en) * 1958-12-22 1961-09-05 Carl Allers Ets Mechanism for clamping flexible printing plates
US3011437A (en) * 1959-01-31 1961-12-05 Aller Press As Mechanism for clamping flexible printing plates to the plate cylinder of machines for flat printing

Also Published As

Publication number Publication date
IT592349A (fr)
NO96575A (fr)
FR1197554A (fr) 1959-12-01
CA635929A (en) 1962-02-06
GB851908A (en) 1960-10-19
NL229234A (fr)
DE1121072B (de) 1962-01-04
BE568959A (fr)

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