US3470817A - Clamping device for flexible printing plates - Google Patents

Clamping device for flexible printing plates Download PDF

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Publication number
US3470817A
US3470817A US662436A US3470817DA US3470817A US 3470817 A US3470817 A US 3470817A US 662436 A US662436 A US 662436A US 3470817D A US3470817D A US 3470817DA US 3470817 A US3470817 A US 3470817A
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US
United States
Prior art keywords
saddle
clamping
support
longitudinal edge
plate
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
US662436A
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English (en)
Inventor
Paul Heimlicher
Rene Burki
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.)
Fallert Winkler and Co Ltd
Original Assignee
Fallert Winkler and Co Ltd
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 Fallert Winkler and Co Ltd filed Critical Fallert Winkler and Co Ltd
Application granted granted Critical
Publication of US3470817A publication Critical patent/US3470817A/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
    • 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
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders

Definitions

  • a clamping device for securing flexible printing plates on a rotary printing press composed of a clamping saddle and means for securing the flexible printing plate on the saddle.
  • a pair of spaced elongated grooves are positioned along the longitudinal edges of the saddle and a movably positionable support member is disposed within each of the grooves having a support surface directed toward and disposed at an oblique angle to the longitudinal edge.
  • the support surfaces in each pair of support members along a longitudinal edge are disposed in oppositely sloping directions with respect to the edge.
  • Screw members are positioned within the saddle attached to the support members for positioning them along the longitudinal edge of the saddle.
  • a clamping bar extends along the longitudinal edge of the saddle spaced outwardly from the support members. Gripping members are provided on the clamping bar to engage slots or openings in the edge of the flexible plate for holding it in position. Slots are formed in the clamping saddle extending between the support surface of the support members to the longitudinal edge of the saddle.
  • a support arm extends from the clamping bar through each of the slots into contact with the support member. The support arm has a contacting surface disposed in parallel touching relationship with the contacting surface on the support member.
  • the support members Due to the angular disposition of the support surfaces of the support member and support arm with respect to the longitudinal edge of the clamping saddle, when the support members are moved in a direction parallel to the longitudinal edge the support arms are urged in a direction normal to the longitudinal edge, forcing the clamping bar outwardly for securing the flexible printing plate in position on the clamping saddle. Additionally, the support members may be adjusted to exert a diagonal stress on the flexible plate in the event that it is necessary to do so to properly align it on the clamping saddle.
  • the present invention is directed to a clamping device for securing a flexible printing plate on a rotary printing press and, more particularly to an arrangement for securing the plate by moving it either transversely, longitudinally or diagonally with respect to the axis of the rotary press.
  • Another object of the present invention is to provide means for simultaneously positioning the support members along a longitudinal edge of the clamping saddle.
  • Still another object of the invention is to provide contaoting surfaces on the elements which position a flexible plate on a clamping saddle for translating a movement parallel to the longitudinal edge of the clamping saddle into a movement normal to the longitudinal edge.
  • a further object of the invention is to provide an arrangement for securing a flexible plate in position on a clamping saddle which is simple in construction and easy to assemble and to adjust.
  • Another object of the invention is to provide a clamping device which supplies an improvement over presently known devices for obtaining proper regis tration of flexible printing plates on clamping saddles, even though the edges of the plates may not be properly disposed at right angles to each other.
  • the present invention provides an arrangement not only for tightly securing a flexible printing plate to a clamping saddle on a rotary printing press, but it also assures the proper registration of the plate on the saddle even if a diagonal displacement of one or both edges of the plate is required with respect to the axis of the printing press.
  • Support members are positioned within the clamping saddle with support surfaces disposed at an oblique angle to [the longitudinal edge of the clamping saddle. The support surfaces along each longitudinal edge are disposed in oppositely sloping directions with respect to the longitudinal edge.
  • Means, such as threaded bolts, are secured to the support members and to the clamping saddle for moving the support members in a direction parallel to the longitudinal edge.
  • a clamping bar Spaced outwardly from the longitudinal edge is a clamping bar having teeth or other gripping means arranged to fit into slots or openings along the edge of the flexible plate and to assist in properly securing the plates in the circumferential direction about the surface of the clamping saddle.
  • the support surfaces of the support members and support arms disposed obliquely with relationship to the longitudinal edge of the clamping saddle, when the support member is moved in a direction parallel to the longitudinal edge, the support arm is moved in a direction normal to the longitudinal edge and as the support arm is forced outwardly from the saddle, the clamping bar securely grips and holds the flexible plate tightly in position. If a diagonal adjustment is required in the flexible plate, the individual support members may be positioned in an unbalanced manner whereby one end of an edge on the flexible plate is forced outwardly to a greater extent than the other end to provide the proper registration.
  • FIG. 1 shows an end view of a clamping device for a rotary printing press incorporating the present invention
  • FIG. 2 is a side view of the clamping device shown in FIG. 1;
  • FIG. 3 is an enlarged partial sectional view taken along line II of FIG. 2;
  • FIG. 4 is an enlarged view of a portion of the clamping device shown in FIG. 2;
  • FIG. 5 is an enlarged partial sectional view of one end of the clamping device as shown in FIG. 1;
  • FIG. 6 is a side view of another embodiment of the present invention viewed from the opposite side of the clamping device to that illustrated in FIG. 2.
  • a clamping saddle 1 is secured to a printing plate cylinder 2 in a manner similar to securing a stereotype printing plate and is secured in position by means of bevels 3.
  • a flexible printing plate 4 having a pair of longitudinally extending edges 4A and a pair of transversely or circumferentially extending edges 4B is mounted on the clamping saddle 1. Along its longitudinal edges 4A the flexible printing plate 4 has a plurality of holes or slots 5 for securing the edge of the plate in position.
  • a clamping bar 7 Spaced below [the longitudinal edge 4A of the plate 4 is a clamping bar 7 which extends in spaced parallel relationship with the adjacent longitudinal edge A of the clamping saddle 1.
  • the clamping bar 7 has a number of teeth or gripping members 6 arranged to register with the holes or slots 5 in the flexible printing plate for securing the plate in position on the clamping saddle.
  • Two support arms 8 extend normally to the clamping bar and fit into slots 9 formed in the clamping saddle, see FIGS. 2 and 3.
  • the width of the support arms 8 is less than the width of the slots affording a certain tolerance permitting the arms to be moved slightly in the direction of the longitudinal edge of the clamping saddle.
  • each slot 9 in the clamping saddle an elongated groove 11 extends perpendicularly to the slot and is in parallel relationship with the longitudinal edge 10A of the clamping saddle.
  • a support member 12 is 10- ,cated in each of these grooves and is positionable along the longitudinal axis of the groove by means of a threaded bolt 14 secured to the saddle and to the support member.
  • a spring 15 is positioned in each of the grooves at the opposite side of the support member from the bolt 14. The spring 15 contacts the support member biasing it in the direction of the circumferentially extending edge 10B of the clamping saddlev
  • the support member 12 has a support surface 13 in contact with and in parallel relationship with a support surface SA on the support arm 8.
  • support surfaces 8A, 13 are disposed obliquely to the longitudinal edge of the clamping saddle, and further, each pair of contacting support surfaces along the longitudinal edge, with relationship to the other pair, are disposed in oppositely sloping directions with respect to the longitudinal edge.
  • FIG. 6 another embodiment of the means for movably positioning the support members 12 is shown wherein a single screw 16 extends through the clamping saddle attached to both of the support members 12 along one longitudinal edge of the clamping saddle so that both of the members can be positioned simultaneously.
  • This particular arrangement for moving the support members facilitates the mounting of the flexible plate on the clamping saddle.
  • the screw 16 is guided in its axial direction by a slide member 17 positioned centrally within a groove 19 along the longitudinal direction of the clamping saddle.
  • a pair of screws 18 extend longitudinally inward from the opposite circumferential edges 10B of the saddle into contact with the opposite surfaces of the slide member 17. This arrangement of the slide member 17 and the screws 18 is provided along each of the longitudinal edges 10A of the clamping saddle.
  • the longitudinal edges of the printing plate will assume an oblique disposition relative to the longitudinal edges of the saddle.
  • the slide 17 and the screws 16 will also move to the right causing the clamping bar 7 and the longitudinal edge of the printing plate attached thereto to be disposed obliquely to the longitudinal edge of the saddle.
  • the clamping bar pivots with its right end moving outwardly from and its left end moving inwardly toward the longitudinal edge of the saddle.
  • the clamping bar will pivot through a position where it is parallel to the longitudinal edge of the saddle and then assume an oblique disposition sloping in the opposite direction as the screws continue to move through to the left.
  • the holes 5 along the longitudinal edges 4A of the plate 4 are fitted onto the gripping members 6 along the clamping bar 7.
  • the support members 8 would be located closer to the center of the clamping saddle so that a certain tolerance is provided in securing the plate.
  • the bar With the plate secured on the gripping members of the clamping bar, the bar can then be disposed outwardly away from the clamping saddle to secure the flexible mounting plate tightly in position in the clamping saddle.
  • the springs 15 in the groove force the support members in a position where a slight degree of tension is provided onto the support arms 8 so that the clamping bars are biased outwardly away from the longitudinal edges 10A of the clamping saddle.
  • the bolts 14 are turned to move the support members 12 in the direction of the circumferential edges 10B of the saddle.
  • the oblique disposition of their surfaces 13 urges the corre sponding support surfaces 8A of the support arms 8 in a direction normal to the longitudinal edge of the saddle A and provides a locking or clamping action as the flexible plate is drawn tightly onto the clamping saddle.
  • the present invention provides not only an effective means for properly tightening the flexible plate on a clamping saddle but also provides for an angular disposition of the flexible plate with respect to the clamping saddle to take care of any misregistration which might be present because of the manner in which the flexible plate is formed.
  • a clamping device for securing a flexible printing plate on a rotary printing press comprising a clamping saddle having a pair of longitudinally extending edges and adapted to receive and support a flexible printing plate, a pair of movably positionable support members disposed within said saddle and located in spaced positions along one of the longitudinal edges of said saddle, each support member having a support surface directed outwardly and disposed at an oblique angle to said longitudinal edge, each support surface in said pair of support members disposed in an oppositely sloping direction with respect to said longitudinal edge, means for moving said support members in a direction parallel with said longitudinal edge, a clamping bar extending along said longitudinal edge of said clamping saddle, a pair of spaced support arms secured to said clamping bar and each arm extending therefrom into contacting engagement with one of said support members, each of said support arms having a support surface in contact with the opposed support surface on said support member, the support surfaces on said support arm in substantially parallel relationship with the support surface of said support member whereby, when the means for positioning said support members move
  • a clamping device as set forth in claim 1, wherein said means for moving said support members comprises a pair of threaded bolts fitted into said clamping saddle and secured to said support members.
  • each of said support arms extends perpendicularly from said clamping bar through one of said slots in said clamping saddle into contact with one of said support members.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US662436A 1966-09-05 1967-08-22 Clamping device for flexible printing plates Expired - Lifetime US3470817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11944/66A SE319494B (pt) 1966-09-05 1966-09-05

Publications (1)

Publication Number Publication Date
US3470817A true US3470817A (en) 1969-10-07

Family

ID=20294880

Family Applications (1)

Application Number Title Priority Date Filing Date
US662436A Expired - Lifetime US3470817A (en) 1966-09-05 1967-08-22 Clamping device for flexible printing plates

Country Status (6)

Country Link
US (1) US3470817A (pt)
CH (1) CH456651A (pt)
DE (1) DE1611243A1 (pt)
FR (1) FR1558313A (pt)
GB (1) GB1200214A (pt)
SE (1) SE319494B (pt)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696744A (en) * 1970-10-13 1972-10-10 North American Rockwell Saddle lockup for flexible printing plate
US3750572A (en) * 1972-06-12 1973-08-07 Rockwell International Corp Printing plate cylinder saddle
US3791295A (en) * 1972-09-11 1974-02-12 W Albright Self-tensioning printing plate saddle
US3858511A (en) * 1973-02-27 1975-01-07 Hercules Inc Flexible plate saddle lock-up system
US3896729A (en) * 1974-02-27 1975-07-29 Hercules Inc Positive backing sheet plate lock-up
US3899972A (en) * 1973-08-27 1975-08-19 William H Albright Registration-adjusting printing plate saddle
US3946670A (en) * 1972-07-17 1976-03-30 Ball Corporation Apparatus for mounting and locking printing plates
US3973496A (en) * 1973-10-29 1976-08-10 Ball Corporation Apparatus for mounting and locking printing plates
US3991675A (en) * 1971-04-01 1976-11-16 Standiford Fred W Clamping saddles for thin flexible printing plates
USRE30718E (en) * 1978-12-14 1981-08-25 Rockwell International Corporation Saddle lockup for flexible printing plate

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709405A (en) * 1949-08-26 1955-05-31 Goss Printing Press Co Ltd Plate lockup for printing press

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709405A (en) * 1949-08-26 1955-05-31 Goss Printing Press Co Ltd Plate lockup for printing press

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696744A (en) * 1970-10-13 1972-10-10 North American Rockwell Saddle lockup for flexible printing plate
US3991675A (en) * 1971-04-01 1976-11-16 Standiford Fred W Clamping saddles for thin flexible printing plates
US3750572A (en) * 1972-06-12 1973-08-07 Rockwell International Corp Printing plate cylinder saddle
US3946670A (en) * 1972-07-17 1976-03-30 Ball Corporation Apparatus for mounting and locking printing plates
US3791295A (en) * 1972-09-11 1974-02-12 W Albright Self-tensioning printing plate saddle
US3858511A (en) * 1973-02-27 1975-01-07 Hercules Inc Flexible plate saddle lock-up system
US3899972A (en) * 1973-08-27 1975-08-19 William H Albright Registration-adjusting printing plate saddle
US3973496A (en) * 1973-10-29 1976-08-10 Ball Corporation Apparatus for mounting and locking printing plates
US3896729A (en) * 1974-02-27 1975-07-29 Hercules Inc Positive backing sheet plate lock-up
USRE30718E (en) * 1978-12-14 1981-08-25 Rockwell International Corporation Saddle lockup for flexible printing plate

Also Published As

Publication number Publication date
FR1558313A (pt) 1969-02-28
DE1611243A1 (de) 1970-12-10
SE319494B (pt) 1970-01-19
GB1200214A (en) 1970-07-29
CH456651A (de) 1968-07-31

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