US3552314A - Printing plate lock up devices - Google Patents

Printing plate lock up devices Download PDF

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Publication number
US3552314A
US3552314A US739380A US3552314DA US3552314A US 3552314 A US3552314 A US 3552314A US 739380 A US739380 A US 739380A US 3552314D A US3552314D A US 3552314DA US 3552314 A US3552314 A US 3552314A
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United States
Prior art keywords
printing plate
printing
shaft
trailing
plate lock
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
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US739380A
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English (en)
Inventor
Charles Henry Skinner
Michael Leonard Hart
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Baker Perkins Ltd
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Baker Perkins Ltd
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Publication date
Application filed by Baker Perkins Ltd filed Critical Baker Perkins Ltd
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Publication of US3552314A publication Critical patent/US3552314A/en
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    • 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
    • B41F27/1243—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 pivotal or swivelling motion, e.g. by means of a rocking lever

Definitions

  • This invention concerns printing plate lock up devices, more especially for web offset printing machines wherein exchangeable printing plates, usually of the order of .0l2" thick require by virtue of their thinness, particularly accurate and reliable positioning, securing and tensioning about the printing cylinder.
  • Usual known lock up devices are constructed separately from the printing cylinder and are adapted for installation in a channel in the periphery of the cylinder to extend across the cylinder parallel to the cylinder axis so that a spring loaded member of the lock up device can engage one hook preformed end of the printing plate with the other hook preformed end of the plate usually located in a fixed groove in the printing cylinder whereby the plate is positioned, secured and tensioned.
  • present developments seek to utilize multiple printing plates mounted side by side across the axial length of the printing cylinder.
  • the object of this invention is the provision of an improved plate lock up device which overcomes one or more of these difficulties and which is particularly simple and convenient in use.
  • a printing plate lock up device comprises a carrier adapted for attachment to or integral with a printing cylinder, a tensioning member mounted on the carrier for engagement with an end of a printing plate, and pressure means acting to displace the tensioning member with respect to the carrier in a direction for tensioning the plate, characterized by a cam shaft which is rotatable from one end of the carrier to displace the tensioning member against the action of the pressure means so as to relax tension of the plate.
  • the tensioning member comprises several separate fingers which are acted upon by respective cams on the cam shafts, and conveniently the axial separation of the fingers is adjustable to vary the overall length of the tensioning member.
  • the longitudinal position of the tensioning member is adjustable through the agency of a shaft providing a pivotal mounting of the member and accessible at one end of the length of the device 'for adjustment of the shaft position.
  • a lock up device having the above defined features has particular advantage when designed for mounting a plurality of side by side printing plates on a printing cylinder, when provision is made for control of separate tensioning members for respective plates to permit individual mounting and removal of a plate without need to disturb an adjacent plate, and to permit mounting of a wide range of plate widths.
  • FIG. 1 is a fragmentary elevation of one end of a printing cylinder embodying a printing plate lock up device according to the invention.
  • FIG. 2 is an end view of the lock up device of FIG. 1 on an enlarged scale with certain operating parts omitted for clarity.
  • FIG. 3 is a cross section of the lock up device taken generally along line 3-3 of FIG. 4.
  • FIG. 4 is a longitudinal section on the line 4-4 of FIG. 2.
  • FIG. 5 is a similar view to FIG. 4 but taken on the line 55 of FIG. 3.
  • FIG. 6 is a fragmentary cross section on the line 6-6 of FIG. 4, and FIG. 7 is a similar view to that of FIG. 2 but illustrating an alternative embodiment of the invention.
  • the improved printing plate lock up device comprises leadings and trailings pairs of tensioning members 10,11 for respectively engaging the two conventionally preformed hook ends adjoining the leading and trailing edges of a side by side pair of printing plates, the pairs of members being respectively mounted on a parallel pair of shafts 12,13 mounted in a common carrier block 14 of generally channel section adapted for installation in a rectangular recess in the periphery of the printing cylinder 15.
  • the leading pair of tensioning members 10 intended for engaging the leading edges of the two printing plates comprises blades 10A, 10B (hereinafter called the leading blades) which are independently fulcrummed in lever fashion on the common shaft 12 (hereinafter called the cam shaft) which is rotatably mounted in bearing blocks 16 mounted on the carrierblock 14.
  • the outer edge of each leading blade 10A, 10B terminates at the arcuate outermost surface 17 of the carrier which is to be contiguous with that of the printing cylinder 15 and this edge incorporates an inclined slot 18 to receive the hook leading end of the printing plate.
  • An arm 19 of the leading blade on the opposite side of the shaft 12 to an arm 20 having the slot 18 presents a face towards the adjacent sidewall of the carrier 14 which face bears against a series of compression spring loaded plungers 21 (FIG. 3) incorporated along the length of carrier wall.
  • These plungers 21 serve to urge the slotted ends of the leading blades towards the adjacent carrier wall in a direction tending to relax tension in the printing plate.
  • the slotted arm 20 of each blade incorporates along its length a plurality of screw tapped holes which receive bolts 22 having heads accessible adjacent the median plane of the carrier with the opposite ends of the bolts bearing against the adjacent carrier sidewall under the pressure provided by the spring loaded plungers 21. Adjustment of these bolts 22 serves to adjust the angular position of the leading blades 10A, 10B and hence provide for adjustment of the circumferential register position of the leading edge of a printing plate with respect to the printing cylinder.
  • the pair of above described leading blades are freely rotatably mounted in approximate alignment on the cam shaft 12 with a fixed separation between their'adjacent ends which separation is preserved by the fitting of cams 23 on the shaft 12 in apertures 24 in the leading blades so that the blades move longitudinally with any axial movement imparted to the shaft 12.
  • One end 25 of the shaft iscoupledwith a stub shaft 26 rotatably mounted in a bearing assembly 27 mounted in an end plate 28 of the printing cylinder 15, and an indented plate 29 rotatable with the stub shaft 26 coacts with a spring plunger 30 of the bearing assembly 27 to locate the shafts 12 and 26 in any selected one of a plurality of angular positions.
  • the bearing assembly 27 further comprises a bearing bush 32 wherein the stub shaft 26 is anchored by circlips 33.
  • the bush 32 has a screw threaded mounting in a sleeve 34 anchored in the plate 28 by circlips 35 and C-spanner holes 36 facilitate relative rotation between the bearing bush 32 and sleeve 34 whereby the former together with the shafts 26 and 12 are caused to shift axially.
  • This latter movement and the fitting of the earns 23 in their apertures in the blades 10A and 10B imparts axial movement to these blades 10A and 10B, the bearing blocks 16 being guided in this movement by engagement of the latter with fixed guides 37 fastened to the carrier 14.
  • a squared end 38 of the stub shaft 26 projecting externally of the plate 28 facilitates the angular adjustment of the shafts as hereinafter more fully described.
  • the two trailing tensioning members 11 intended for engagement with the trailing edges of the pair of printing plates are each constituted by several lever fingers 40 mounted in side by side relationship on the common shaft 13 (hereinafter called the finger shaft) which shaft 13 is mounted in bearing blocks 41 fastened to the carrier 14 so that the shaft can rotate without axial movement.
  • axially extending pairs of recesses 42 surrounding the shaft apertures in the opposite sides of adjoining pairs of fingers 40 accommodate helical thrust springs (not shown to preserve clarity) which serve to urge the fingers apart.
  • the finger shaft 13 is screw threaded at 43 and engages in a split nut 44 capable-of longitudinal displacement relative to the shaft 13 and carrier 14 upon rotation of the shaft effected by turning a squared end 45 of a stub shaft 46 rotatably mounted in the plate 28 and connected to the finger shaft 13 by a coupling sleeve 47.
  • Rotation of the shafts 13 and 46 to effect movement of the nut 44 in one direction serves to reduce the separation between the fingers 40 constituting a trailing blade on one side of the nut (as shown in their fully closed position on the righthand side of FIG. and simultaneously permits the thrust springs to increase the separation of the fingers constituting a second trailing blade on the other side of the nut (as shown in their fully extended position on the left-hand side of FIG. 5).
  • rotation of the finger shaft 13 serves simultaneously to adjust the overall effective lengths of the two trailing tensioning members 11 in opposite senses.
  • the fingers all extend from the finger shaft to reach the arcuate outermost surface 17 of the carrier where they incorporate a slot 48 aligned with the slots of the other fingers so that all fingers can simultaneously engage the trailing edges of two printing plates.
  • Mounted in a recess in the sidewall of the carrier adjacent the fingers 40 is a series of spring loaded pressure pads 49 which bear upon the fingers to urge the latter towards the leading blade in a direction to tension the plates, the uniform tensioning of the platesbeing greatly facilitated by the independent mounting of the many fingers.
  • each finger Formed as an integral part of each finger is a shoulder 50 projecting towards the earns 23 on the first shaft 12.
  • the two sets of cams 23 associated with the two leading blades A, 10B are 45 out of phase and are free to move through a generally semicylindrical recess 51 in the wall of the carrier adjacent the cam shaft.
  • the function of the cams 23 is as follows. 1n a first angular position of the cam shaft 12, all of the cams are inoperative, the slots 18 in the leading tensioning members 10 are positioned in accordance with the setting of their adjusting bolts 22, and the trailing tensioning members 11 constituted by the fingers all assume a position determined ,by the balance between the thrust of the pressure pads 49 and length of their respective two printing plates.
  • the cams 23 With the cam shaft 12 turned through 135 to a second position the cams 23 are repositioned so that one set of cams bears against the shoulders 50 of the fingers 40 constituting one trailing blade sufficiently to force these fingers towards the adjacent wall of the carrier block to overcome the thrust of the pressure pads 49 and so relax the tension in their respective printing plate sufficiently to permit its removal.
  • the other set of cams fails to touch the shoulders of the fingers constituting the other trailing blade so that the latter maintains its tension upon its respective printing plate.
  • the second set of cams serves to relax the tension in the second plate whilst permitting the first trailing blade fingers to maintain tension in the first plate.
  • both sets of cams 23 act on the finger shoulders of both trailing tensioning members sufficiently to permit disengagement of both plates.
  • a marking of the exposed end 38 of the stub shaft registers with reference markings on an adjoining part of the plate 28 to facilitate the setting of the shaft in a desired position as located by the selector plate 29 and plunger 30.
  • the above lock up device is required to mount a double width plate instead of two separate plates in which case the two settings of the cam shaft which provide operation of one or other set of cams only is disadvantageous.
  • This disadvantage can be overcome by provision for resetting the earns 23 relative to the shaft 12 in a second position wherein all cams are in phase and this feature is illustrated in H0. 6 wherein the cam set screws 60 each have alternative engagement with the two recesses 61 and 62 in the cam shaft 12.
  • two of the above described lock up devices with either separate carriers or a common carrier are mounted in alignment in a common recess in the printing cylinder '15 with their respective adjustable shaft ends 38 and 45 exposed at respective ends of the cylinder.
  • the two lock up devices in order to mount the two lock up devices end to end in a double width cylinder, they must be constructed for left-hand and right-hand actuation by shafts which extend from the opposite endsof the cylinder. in the case where more than one printing plate is accommodated in the circumferential direction of the cylinder a like number of sets of lock up devices must be incorporated in respective channels in the cylinder.
  • the leading blade 10a disposed nearer the centerline of, the cylinder has a fixed length of 15% inches
  • the outer leading blade 108 has a fixed length of 17 inches
  • theadjacent ends of the two leading blades have a constant separation of five-eighth inch.
  • the trailing tensioning members 11 are both continuously adjustable throughout at least the range of 15% inches to 16% inches.
  • the cam shaft bearing bush 32 and finger shaft 13 are both rotated to position both leading blades 10A,.10B at their extreme position nearest the center line of the half cylinder and to contract the inner trailing tensioning member and permit spring urged expansion of the outer trailing tensioning member so that both trailing tensioning members are at least 15% inches long.
  • the inner plate in now hook engaged with the inner leading blade so that the two ends of the latter both project-one-eighth inch beyond the edges of the inner plate, whereas the outer plate is mounted with one-eighth inch extension of the inner end of the outer leading blade beyond the inner edge of the outer plate, and 1% inch projection of the outer end of this blade beyond the outer edge of this plate.
  • cam shaft bearing bush 32 and finger shaft 13 are both adjusted to displace both leading blades five-eighth inch further from the cylinder half center line and to adjust the overall lengths of each of the trailing tensioning members to at least 16% inch.
  • the inner plate is now mounted on the cylinder with one-half inch overlap of its inner and outer edges beyond the,inner and outer ends of the inner leading blade, and the outer plate is mounted with its two edges each three-eighth inch inside the two ends of the outer leading blade. Again the opposite ends of the two plates are hook engaged with the two trailing tensioning members over the entire widths of the plates.
  • the lock up device can be provided with finger type blades for engagement with one end of the plates whereas the other ends of the plates are engaged in a fixed slot 70 inthe carrier as illustrated in FIG. 7, or in a slot in the printing cylinder.
  • a printing plate lock up device comprising a carrier in a recess in the periphery of a rotary printing cylinder, tensioning means mounted on said carrier and adapted to be connected to the leading and trailing edge portions of at least two printing plates positioned in side by side printing relationship around at least a segment of said periphery, said tensioning means including abutment means for engaging the leading edge portions of the printing plates and including at least two trailing members for pressure engagement with respective trailing edge portions of said printing plates, and pressure means mounted on said carrier for displacing said trailing means individually with respect to said carrier in a direction causing tensioning of said plates around said periphery while the leading edge portions are in engagement with said abutment means; characterized by a rotatable cam shaft mounted on said carrier for rotation about an axis generally parallel to the axis of the cylinder, a plurality of cam formations on said shaft each constructed to displace, at a respective preselected angular position of the shaft, a respective trailing member against the action of the
  • a printing plate lock up device according to claim 1 wherein at least one of said cam formations is adjustable to dispose said cam formations at substantially the same angular positions relative to said cam shaft.
  • a printing plate lock up device characterized in that said trailing members each comprise several independently movable fingers.
  • a printing plate lock up device characterized in that said fingers are all pivotally mounted on a common finger shaft extending parallel with said cam shaft and are shiftable axially along said finger shaft for varying the overall width of each trailing member constituted by the fingers.
  • a printing plate lock up device characterized in that said fingers are resiliently urged apart from each other axially of the finger shaft.
  • a printing plate lock up device characterized in that said finger shaft is rotatable and has screw engagement with a nut intermediate two of the trailing tensioning members so. that rotation of the finger shaft disabutment means characterized by at least one leading tensioning member pivotally mounted on said cam shaft for engagement with the leading edge portions of at least one printing plate positioned on the cylinder.
  • a printing plate lock up device characterized by two leading tensioning members mounted on said cam shaft, said cam shaft being displaceable axially to effect a corresponding displacement of said leading tensioning members.
  • a printing plate lock up device characterized in that said cam formations are located in apcrtures in the cam shaft mounted leading tensioning members to cause displacement of the latter with axial displacement of the cam shaft.
  • Aprinting plate lock up device characterized by a shaft bearing assembly includin a screwed sleeve WhlCh is rotatable m an end plate of the cy mder to effect the axial displacement of said cam shaft.
  • a printing plate lock up device characterized by at least one adjusting bolt having screw engagement through the leading tensioning member and bearing against said carrier for varying the angular position of a printing plate engaging formation of the leading tensioning member relative to the carrier.
  • a printing plate lock up device characterized in that at least one cam formation has two alternative angular positions of connection to the cam shaft, enabling said one formation to be set in phase with another of said formations to provide for simultaneous displacement of two of the trailing tensioning members.
  • each trailing tensioning member is capable of overall variation in width between 15% inches and 16% inches approximately.
  • a printing plate lock up device wherein one leading tensioning'member is approximately 15 /4 inches wide and the neighboring tensioning member is approximately 17 inches wide with a separation of approximately five-eighth inches between their adjacent ends.
  • a printing plate lock up device characterized in that at least one of said shafts has connection at one end of the carrier with a respective stub shaft rotatably mounted in an end plate of the cylinder with an exposed shaft end to facilitate rotation of said shaft from one end of the carrier.
  • a lock up device according to claim 1 wherein the carrier is integral with the printing cylinder.
  • a printing cylinder characterized by its incorporation of two printing plate lock up devices, each according to claim 1, wherein their respective cam shafts are coaxial and are angularly adjustable from respective opposite ends of the printing cylinder.
  • a printing cylinder characterized by its incorporation of two lock up devices, each according to claim 1, located at respective angular positions on the cylinder periphery for tensioning two pairs of side-by-side printing plates about respective segments of the said periphery.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US739380A 1967-06-30 1968-06-24 Printing plate lock up devices Expired - Lifetime US3552314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24820/67A GB1217156A (en) 1967-06-30 1967-06-30 Improvements in printing plate lock up devices

Publications (1)

Publication Number Publication Date
US3552314A true US3552314A (en) 1971-01-05

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ID=10217744

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Application Number Title Priority Date Filing Date
US739380A Expired - Lifetime US3552314A (en) 1967-06-30 1968-06-24 Printing plate lock up devices

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US (1) US3552314A (xx)
CH (1) CH480951A (xx)
DE (1) DE1761642B1 (xx)
FR (1) FR1571193A (xx)
GB (1) GB1217156A (xx)
NL (1) NL6809236A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225016B2 (de) * 1972-05-23 1975-06-05 Koenig & Bauer Ag, 8700 Wuerzburg Vorrichtung zum Aufspannen von biegsamen Druckplatten auf Formzylinder von Rotationsdruckmaschinen
US5383401A (en) * 1994-02-22 1995-01-24 Heidelberg Druckmaschinen Ag Actuating device for clamping arrangement for printing plates in rotary printing presses
CN103612480B (zh) * 2013-10-30 2016-02-24 高斯图文印刷系统（中国）有限公司 一种印版的自动锁紧装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220530C2 (de) * 1982-06-01 1985-02-21 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Aufspannen von Tiefdruckplatten
DE4244279C2 (de) * 1992-12-28 1995-05-18 Heidelberger Druckmasch Ag Druckformkorrektureinrichtung zum Ausgleich von Druckträgerdehnungen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049454A (en) * 1934-11-17 1936-08-04 Hoe & Co R Printing plate clamping mechanism
US2708875A (en) * 1952-05-31 1955-05-24 Hoe & Co R Printing plate cylinder
US2709406A (en) * 1951-03-31 1955-05-31 Goss Printing Press Co Ltd Tension lockup for printing press
US3230879A (en) * 1963-08-06 1966-01-25 Wood Newspaper Mach Corp Underside tension lockup apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2056205A (en) * 1932-11-16 1936-10-06 American Can Co Clamping device
US2768579A (en) * 1952-07-26 1956-10-30 Tribune Company Lock-up device for flexible printing plates
US2768578A (en) * 1953-10-08 1956-10-30 Tribune Company Lock-up mechanism for dry offset printing plates
US3107609A (en) * 1961-05-04 1963-10-22 Emric G Haramija Mechanism for holding and tensioning a printing plate on a printing cylinder
US3191532A (en) * 1963-12-26 1965-06-29 Miehle Goss Dexter Inc Plate clamping mechanism for rotary printing press

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049454A (en) * 1934-11-17 1936-08-04 Hoe & Co R Printing plate clamping mechanism
US2709406A (en) * 1951-03-31 1955-05-31 Goss Printing Press Co Ltd Tension lockup for printing press
US2708875A (en) * 1952-05-31 1955-05-24 Hoe & Co R Printing plate cylinder
US3230879A (en) * 1963-08-06 1966-01-25 Wood Newspaper Mach Corp Underside tension lockup apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225016B2 (de) * 1972-05-23 1975-06-05 Koenig & Bauer Ag, 8700 Wuerzburg Vorrichtung zum Aufspannen von biegsamen Druckplatten auf Formzylinder von Rotationsdruckmaschinen
DE2225016C3 (de) * 1972-05-23 1976-01-29 Koenig & Bauer Ag Vorrichtung zum aufspannen von biegsamen druckplatten auf formzylinder von rotationsdruckmaschinen
US5383401A (en) * 1994-02-22 1995-01-24 Heidelberg Druckmaschinen Ag Actuating device for clamping arrangement for printing plates in rotary printing presses
CN103612480B (zh) * 2013-10-30 2016-02-24 高斯图文印刷系统（中国）有限公司 一种印版的自动锁紧装置

Also Published As

Publication number Publication date
FR1571193A (xx) 1969-06-13
DE1761642B1 (de) 1972-01-20
GB1217156A (en) 1970-12-31
CH480951A (de) 1969-11-15
NL6809236A (xx) 1968-12-31

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