EP0222033A1 - Flexographic plate mounting apparatus and method - Google Patents
Flexographic plate mounting apparatus and method Download PDFInfo
- Publication number
- EP0222033A1 EP0222033A1 EP85114320A EP85114320A EP0222033A1 EP 0222033 A1 EP0222033 A1 EP 0222033A1 EP 85114320 A EP85114320 A EP 85114320A EP 85114320 A EP85114320 A EP 85114320A EP 0222033 A1 EP0222033 A1 EP 0222033A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- plate
- register
- flexographic
- registration
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- GJYSUGXFENSLOO-UHFFFAOYSA-N chromium;pyridine-2-carboxylic acid Chemical compound [Cr].OC(=O)C1=CC=CC=N1.OC(=O)C1=CC=CC=N1.OC(=O)C1=CC=CC=N1 GJYSUGXFENSLOO-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
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
- B41F27/005—Attaching and registering printing formes to supports
-
- 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
Definitions
- the present invention relates to an apparatus and method for applying flexographic printing plates to the plate cylinders of printing machines.
- flexographic plate be accurately positioned on each plate cylinder in order that images printed in different colours by different cylinders are in registration.
- Canadian Patent 975,217 issued to Chromax Limited on September 30, 1975 shows a machine for such a purpose in which a flexographic printing place is first positioned on a slide. The slide is then moved relatively to a printing cylinder and pressure sensitive adhesive on the reverse side of the flexographic plate causes it to stick to the wrap around the cylinder in registration.
- the present invention provides an improved, compact and simple apparatus which first positions the flexographic printing plate on a register cylinder by means of register pins and then transfers the plate to a plate cylinder.
- the plate is retained on the plate cylinder surface magnetically or by an adhesive substance.
- the invention relates to apparatus for mounting a flexographic plate in registration on a plate cylinder, the flexographic plate being provided with registration holes at one end thereof.
- the apparatus comprises: a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations, means supporting a flexographic plate with the one end supported by the register cylinder and the registration holes engaged by registration pins, means for first rotating the register cylinder a precise amount whereby the flexographic plate is positioned for transfer to a plate cylinder, a movable plate cylinder support for receiving a plate cylinder at a predetermined rotational position, whereby the plate cylinder may abut the flexographic plate and register cylinder after the register cylinder has performed its first rotation, and means for further rotating the register cylinder when abutting the plate cylinder whereby the flexographic plate is transferred to the plate cylinder in registration.
- the invention in its method aspect relates to a method for mounting a flexographic plate in registration on a plate cylinder by use of a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations.
- the method comprises the steps of: positioning the flexographic plate with holes at one end engaging the pins in the register cylinder, rotating the register cylinder a precise amount, positioning the plate cylinder at a predetermined rotational position abutting the flexographic plate and register cylinder, retracting the registration pins and rotating both the register cylinder and plate cylinder whereby the flexographic plate transfers to the plate cylinder in registration.
- Figures 1 and 2 show two views of the plate mounting apparatus of the present invention.
- An underlying support or base member 10 has bearing journals 13 supporting stub support shafts 12 of a register cylinder 11.
- Index plate 22 is used for locking the register cylinder in positions spaced exactly 180° apart, as will be more fully described below.
- Hand wheel 23 is used by an operator to rotate the register cylinder during use and cam control knob 24 adjusts the position of an internal cam 25.
- Cam 25 cooperates with a series of holes 26 which are adapted to receive register pins 27.
- Bearing journals 14 are provided adjacent to the register cylinder to receive a plate cylinder 16 from a conventional printing machine.
- Cylinder 16 has stub support shafts 15 and is adjusted to fit axially by knob 31 of an adjustment mechanism 30.
- the print cylinder is provided with a helical drive gear 32, at the end opposite from adjusting mechanism 30, and this is used to lock the cylinder against rotation as described more fully below.
- the plate cylinder bearing journals 14 are movable on guide members 17 so that the plate cylinder can be moved towards and away from register cylinder 11 under control of the operator by using handle 21 controlling threaded rod 20.
- Adjustable supports to receive a removable plate cylinder are shown, for example, in U.S. Patent No. 3,347,161, issued October 17, 1967, to Lenk and in U.S. Patent No. 3,390,633, issued July 2, 1968, to Broughton.
- Figure 3 shows the mechanism employed to lock the plate cylinder and register cylinder against rotation at selected times during operation of the apparatus.
- a movable locating pin 34 engages with a tooth of helical gear 32.
- the position of pin 34 is controlled by a screw thread driven by knob 35 and may be locked in position by a further knob 36.
- index plate 22 is provided with opposed locking recesses 37 and 38 spaced exactly by 180° which cooperate with a locating pin 40 carried by a slidable plate 41.
- Plate 41 is spring biased so as to be urged into engagement with the index plate. It can be pulled downwardly by a tongue portion 42 extending at right angles to the plane of Figure 3.
- Plate 41 can be held in the retracted position by a spacer block 43 which may be pivoted to occupy the space above tongue 42 by means of a handle 44.
- a positioning tray 45 extends downwardly towards the upper part of register cylinder 11.
- An adjustably mounted, channelled guide member 46 is carried by base 10. The function of the guide member is to maintain tension in the flexographic plate and guide it as the register cylinder rotates.
- the spacing between the register cylinder 11 and the exit portion of guide member 32 can be varied to accommodate flexographic plates of varying thickness by a screw adjusting mechanism controlled by knob 47.
- a flexographic plate 33 is positioned face downwardly on the positioning tray 45 and register holes at one end of the flexographic plate are engaged by pins 27 placed in appropriate holes 26 in register cylinder 11.
- the apparatus is then in the position shown in Figure 4.
- the register cylinder is then rotated through 180° to the position shown in Figure 5 where the flexographic plate is supported by register pins 27 and by the guide member 46.
- the plate cylinder 16 is then adjusted by means of handle 21 to abut the flexographic plate 33 and the register cylinder 11 as shown in Figure 6.
- An adhesive surface 48 provided on plate cylinder 16 engages the rear surface of flexographic plate 33 and under the pressure of the plate cylinder, register pins 27 retract into holes 26 in register cylinder 11.
- Plate cylinder 16 is then unlocked for rotation and register cylinder 11 is further rotated leading to the situation shown in Figure 7 in which flexographic plate 33 has adhered to plate cylinder 16 in registration whereupon plate cylinder 16 may be removed and utilized in printing apparatus. Register cylinder 11 may then be returned to its original position ready to receive the next flexographic plate.
Landscapes
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Abstract
In printing with flexographic plates it is essential that each plate be accurately positioned on the plate cylinders. The mounting apparatus and method of this invention provide a register cylinder (11) on which the flexographic plate is positioned by registration pins (27). The plate cylinder (16) on which the flexographic plate is to be mounted is positioned in a predetermined rotational position on a mounting so that it can be moved towards and away from the register cylinder. The register cylinder (11) is then rotated to a predetermined position and the plate cylinder (16) brought into abutment with the flexographic plate and register cylinder. The registration pins (27) are then retracted and both cylinders rotated to transfer the flexographic plate to the outer surface of the plate cylinder in registration. The plate adheres to the cylinder surface either by an adhesive substance, such as double sided tape, or magnetically.
Description
- The present invention relates to an apparatus and method for applying flexographic printing plates to the plate cylinders of printing machines.
- It is essential that the flexographic plate be accurately positioned on each plate cylinder in order that images printed in different colours by different cylinders are in registration.
- Canadian Patent 975,217 issued to Chromax Limited on September 30, 1975 shows a machine for such a purpose in which a flexographic printing place is first positioned on a slide. The slide is then moved relatively to a printing cylinder and pressure sensitive adhesive on the reverse side of the flexographic plate causes it to stick to the wrap around the cylinder in registration.
- The present invention provides an improved, compact and simple apparatus which first positions the flexographic printing plate on a register cylinder by means of register pins and then transfers the plate to a plate cylinder. The plate is retained on the plate cylinder surface magnetically or by an adhesive substance.
- Specifically the invention relates to apparatus for mounting a flexographic plate in registration on a plate cylinder, the flexographic plate being provided with registration holes at one end thereof. The apparatus comprises: a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations, means supporting a flexographic plate with the one end supported by the register cylinder and the registration holes engaged by registration pins, means for first rotating the register cylinder a precise amount whereby the flexographic plate is positioned for transfer to a plate cylinder, a movable plate cylinder support for receiving a plate cylinder at a predetermined rotational position, whereby the plate cylinder may abut the flexographic plate and register cylinder after the register cylinder has performed its first rotation, and means for further rotating the register cylinder when abutting the plate cylinder whereby the flexographic plate is transferred to the plate cylinder in registration.
- In its method aspect the invention relates to a method for mounting a flexographic plate in registration on a plate cylinder by use of a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations. The method comprises the steps of: positioning the flexographic plate with holes at one end engaging the pins in the register cylinder, rotating the register cylinder a precise amount, positioning the plate cylinder at a predetermined rotational position abutting the flexographic plate and register cylinder, retracting the registration pins and rotating both the register cylinder and plate cylinder whereby the flexographic plate transfers to the plate cylinder in registration.
- A specific embodiment of the invention will now be described in conjunction with the accompanying drawings, in which:
- Figure 1 is a plan view of the apparatus of the invention;
- Figure 2 is a front view of the apparatus shown in Figure 1 with the positioning tray shown in phantom;
- Figure 3 is a side view of the apparatus showing the locking mechanism for each of the cylinders; and
- Figures 4 - 7 show the sequence of operation of the apparatus.
- Figures 1 and 2 show two views of the plate mounting apparatus of the present invention. An underlying support or
base member 10 has bearingjournals 13 supportingstub support shafts 12 of a register cylinder 11. At the end of the left hand stub support shaft, referring to Figure 1, there is provided anindex plate 22, ahand wheel 23 and acam control knob 24.Index plate 22 is used for locking the register cylinder in positions spaced exactly 180° apart, as will be more fully described below.Hand wheel 23 is used by an operator to rotate the register cylinder during use andcam control knob 24 adjusts the position of aninternal cam 25.Cam 25 cooperates with a series ofholes 26 which are adapted to receiveregister pins 27. In the position of the cam shown in Figure 1 the register pins are maintained with an end protruding outwardly from the cylinder, to retain aflexographic plate 33 thereon as shown in phantom in Figure 2, and in the other position of the cam it permits the pins to be wholly retracted within the cylinder. Cylinders with retractable pins are known such as those shown in Canadian Patent No. 724,050, issued December 21, 1965 to Raybuck and Canadian Patent No. 1,027,803, issued March 14, 1978 to Gubela. -
Bearing journals 14 are provided adjacent to the register cylinder to receive aplate cylinder 16 from a conventional printing machine.Cylinder 16 hasstub support shafts 15 and is adjusted to fit axially byknob 31 of anadjustment mechanism 30. Normally, the print cylinder is provided with ahelical drive gear 32, at the end opposite fromadjusting mechanism 30, and this is used to lock the cylinder against rotation as described more fully below. - The plate
cylinder bearing journals 14 are movable onguide members 17 so that the plate cylinder can be moved towards and away from register cylinder 11 under control of the operator by usinghandle 21 controlling threadedrod 20. Adjustable supports to receive a removable plate cylinder are shown, for example, in U.S. Patent No. 3,347,161, issued October 17, 1967, to Lenk and in U.S. Patent No. 3,390,633, issued July 2, 1968, to Broughton. - Figure 3 shows the mechanism employed to lock the plate cylinder and register cylinder against rotation at selected times during operation of the apparatus. A movable locating
pin 34 engages with a tooth ofhelical gear 32. The position ofpin 34 is controlled by a screw thread driven byknob 35 and may be locked in position by afurther knob 36. So far as the register cylinder is concerned,index plate 22 is provided withopposed locking recesses slidable plate 41.Plate 41 is spring biased so as to be urged into engagement with the index plate. It can be pulled downwardly by atongue portion 42 extending at right angles to the plane of Figure 3.Plate 41 can be held in the retracted position by aspacer block 43 which may be pivoted to occupy the space abovetongue 42 by means of ahandle 44. - Referring now to Figures 4 - 7, a
positioning tray 45 extends downwardly towards the upper part of register cylinder 11. An adjustably mounted, channelledguide member 46 is carried bybase 10. The function of the guide member is to maintain tension in the flexographic plate and guide it as the register cylinder rotates. The spacing between the register cylinder 11 and the exit portion ofguide member 32 can be varied to accommodate flexographic plates of varying thickness by a screw adjusting mechanism controlled byknob 47. - In operation, a
flexographic plate 33 is positioned face downwardly on thepositioning tray 45 and register holes at one end of the flexographic plate are engaged bypins 27 placed inappropriate holes 26 in register cylinder 11. The apparatus is then in the position shown in Figure 4. The register cylinder is then rotated through 180° to the position shown in Figure 5 where the flexographic plate is supported byregister pins 27 and by theguide member 46. - The
plate cylinder 16 is then adjusted by means ofhandle 21 to abut theflexographic plate 33 and the register cylinder 11 as shown in Figure 6. Anadhesive surface 48 provided onplate cylinder 16 engages the rear surface offlexographic plate 33 and under the pressure of the plate cylinder, registerpins 27 retract intoholes 26 in register cylinder 11. -
Plate cylinder 16 is then unlocked for rotation and register cylinder 11 is further rotated leading to the situation shown in Figure 7 in whichflexographic plate 33 has adhered toplate cylinder 16 in registration whereuponplate cylinder 16 may be removed and utilized in printing apparatus. Register cylinder 11 may then be returned to its original position ready to receive the next flexographic plate. - Thus, there has been described an apparatus and method useful for mounting flexographic plates in registration on a plate cylinder. It is contemplated that the flexographic plate can adhere to plate cylinder by magnetic attraction as well as by other forms of adhesion.
Claims (4)
1. Apparatus for mounting a flexographic plate in registration on a plate cylinder, the flexographic plate being provided with registration holes at one end thereof, said apparatus comprising;
a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations,
means supporting a flexographic plate with said one end supported by the register cylinder and the registration holes engaged by said registration pins,
means for first rotating the register cylinder a precise amount whereby the flexographic plate is positioned for transfer to a plate cylinder,
a movable plate cylinder support for receiving a plate cylinder at a predetermined rotational position, whereby the plate cylinder may abut the flexographic plate and register cylinder after the register cylinder has performed its first rotation, and
means for further rotating the register cylinder when abutting the plate cylinder whereby the flexographic plate is transferred to the plate cylinder in registration.
a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations,
means supporting a flexographic plate with said one end supported by the register cylinder and the registration holes engaged by said registration pins,
means for first rotating the register cylinder a precise amount whereby the flexographic plate is positioned for transfer to a plate cylinder,
a movable plate cylinder support for receiving a plate cylinder at a predetermined rotational position, whereby the plate cylinder may abut the flexographic plate and register cylinder after the register cylinder has performed its first rotation, and
means for further rotating the register cylinder when abutting the plate cylinder whereby the flexographic plate is transferred to the plate cylinder in registration.
2. Apparatus as set out in claim 1 wherein said means for supporting a flexographic plate is a positioning tray adjacent the register cylinder and adapted to receive a flexographic plate in face downward position.
3. Apparatus as set out in claim 2 further including guide means positioned adjacent said register cylinder on the opposite side from said tray to ensure said flexographic plate is retained on said register cylinder during said first rotation.
4. A method for mounting a flexographic plate in registration on a plate cylinder by use of a register cylinder capable of controlled rotation and provided with a row of apertures to receive retractible registration pins at selected locations, comprising the steps of:
positioning the flexographic plate with holes at one end engaging the pins in the register cylinder,
rotating the register cylinder a precise amount,
positioning the plate cylinder at a predetermined rotational position abutting the flexographic plate and register cylinder,
retracting the registration pins and rotating both the register cylinder and plate cylinder whereby the flexographic plate transfers to the plate cylinder in registration.
positioning the flexographic plate with holes at one end engaging the pins in the register cylinder,
rotating the register cylinder a precise amount,
positioning the plate cylinder at a predetermined rotational position abutting the flexographic plate and register cylinder,
retracting the registration pins and rotating both the register cylinder and plate cylinder whereby the flexographic plate transfers to the plate cylinder in registration.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/654,085 US4589338A (en) | 1984-02-17 | 1984-09-25 | Flexographic plate mounting apparatus and method |
EP85114320A EP0222033A1 (en) | 1985-11-11 | 1985-11-11 | Flexographic plate mounting apparatus and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP85114320A EP0222033A1 (en) | 1985-11-11 | 1985-11-11 | Flexographic plate mounting apparatus and method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0222033A1 true EP0222033A1 (en) | 1987-05-20 |
Family
ID=8193877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85114320A Withdrawn EP0222033A1 (en) | 1984-02-17 | 1985-11-11 | Flexographic plate mounting apparatus and method |
Country Status (1)
Country | Link |
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EP (1) | EP0222033A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0286020A2 (en) * | 1987-04-09 | 1988-10-12 | BASF Aktiengesellschaft | Method of joining the cut-up edges of photopolymerised flexographic formes |
EP0386316A1 (en) * | 1989-03-07 | 1990-09-12 | Landis & Gyr Business Support AG | Method for the production of a sleeve-like matrice and device to carry out the method |
WO2006042637A2 (en) * | 2004-10-20 | 2006-04-27 | Windmöller & Hölscher Kg | Printing plate cylinder with exchangeable sleeve and male and female register elements |
US9056450B2 (en) | 2013-03-04 | 2015-06-16 | Uni-Pixel Displays, Inc. | Method of mounting a flexographic printing plate with structured patterned backing tape |
WO2017032966A1 (en) * | 2015-08-25 | 2017-03-02 | Jm Heaford Limited | Apparatus and method for mounting a flexible plate |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE655639C (en) * | 1935-04-03 | 1938-01-20 | Georg Boettinger | Process for sticking rubber clichés on the forming rollers for anil printing machines |
GB775399A (en) * | 1955-05-03 | 1957-05-22 | Bobst Fils Sa J | A method of and apparatus for mounting a stereo plate on a cylindrical body |
-
1985
- 1985-11-11 EP EP85114320A patent/EP0222033A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE655639C (en) * | 1935-04-03 | 1938-01-20 | Georg Boettinger | Process for sticking rubber clichés on the forming rollers for anil printing machines |
GB775399A (en) * | 1955-05-03 | 1957-05-22 | Bobst Fils Sa J | A method of and apparatus for mounting a stereo plate on a cylindrical body |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0286020A2 (en) * | 1987-04-09 | 1988-10-12 | BASF Aktiengesellschaft | Method of joining the cut-up edges of photopolymerised flexographic formes |
EP0286020A3 (en) * | 1987-04-09 | 1989-04-26 | Basf Aktiengesellschaft | Method of joining the cut-up edges of photopolymerised flexographic formes |
EP0386316A1 (en) * | 1989-03-07 | 1990-09-12 | Landis & Gyr Business Support AG | Method for the production of a sleeve-like matrice and device to carry out the method |
WO2006042637A2 (en) * | 2004-10-20 | 2006-04-27 | Windmöller & Hölscher Kg | Printing plate cylinder with exchangeable sleeve and male and female register elements |
WO2006042637A3 (en) * | 2004-10-20 | 2006-11-23 | Windmoeller & Hoelscher | Printing plate cylinder with exchangeable sleeve and male and female register elements |
US8800445B2 (en) | 2004-10-20 | 2014-08-12 | Windmoeller & Hoelscher Kg | Printing plate cylinder registration |
US9056450B2 (en) | 2013-03-04 | 2015-06-16 | Uni-Pixel Displays, Inc. | Method of mounting a flexographic printing plate with structured patterned backing tape |
WO2017032966A1 (en) * | 2015-08-25 | 2017-03-02 | Jm Heaford Limited | Apparatus and method for mounting a flexible plate |
US11446920B2 (en) | 2015-08-25 | 2022-09-20 | Jm Heaford Limited | Apparatus and method for mounting a flexible plate |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
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Effective date: 19871121 |