CA1286536C - Printing cylinder with retractable plate register pin and method of assembly - Google Patents
Printing cylinder with retractable plate register pin and method of assemblyInfo
- Publication number
- CA1286536C CA1286536C CA000528988A CA528988A CA1286536C CA 1286536 C CA1286536 C CA 1286536C CA 000528988 A CA000528988 A CA 000528988A CA 528988 A CA528988 A CA 528988A CA 1286536 C CA1286536 C CA 1286536C
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- pin
- plate
- pins
- bushing
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000005291 magnetic effect Effects 0.000 claims abstract description 11
- 241001052209 Cylinder Species 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- 239000003302 ferromagnetic material Substances 0.000 claims description 2
- 230000003405 preventing effect Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims 3
- 230000002093 peripheral effect Effects 0.000 claims 3
- 239000000463 material Substances 0.000 claims 2
- 150000002500 ions Chemical class 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 101100356341 Caenorhabditis elegans retr-1 gene Proteins 0.000 description 1
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 101100412856 Mus musculus Rhod gene Proteins 0.000 description 1
- 101100242191 Tetraodon nigroviridis rho gene Proteins 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000008609 bushi Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
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
- B41F27/02—Magnetic devices
Abstract
Abstract Printing Cylinder with Retractable Plate Register Pin and Method of Assembly A magnetic printing cylinder has retractable plate register pins. The printing plate is positioned on the cyl-inder by engagement of an edge of the plate with the pins in extended position. The pins are moved to retracted position and the plate wrapped around the cylinder. The pin moves radially of the cylinder in a bushing. O-rings on the pin limit outward movement of the pin and resist pin rotation.
In assembly of the cylinder, the pin and bushing extend above the cylinder surface and are ground to the final cyl-inder dimension.
In assembly of the cylinder, the pin and bushing extend above the cylinder surface and are ground to the final cyl-inder dimension.
Description
36~ii3~
PRINTING CYLINDER WITH RETR1~CTABLE PI~TE
REGIS~E~ PIN P.ND ME'rHOD O~ ASSEMBLY
Specification : - :
This application relates to a plate register pin ~or positionlng a printing plate on a print:ing cylinder and more particularly to a register pin which is movable between extended and retracted positions and to a method o~ cylinder assembly.
.. . .
Backround of the Invention In 60me pr~ntlng applica~ions the printing plate ~;.
(or blanket) is mounted on a magnetic cylinder and is he~d on the 6urface o~ the cylinder by magnetic attraction. If precise positionlng o~ the plate on the cylinder is impor-~ tant, the cylinder may have one or more register pins which~ ~.
- 15 locate the plate. One such construction is shown in Rosta~
. U.S. Patent No. 3,919,937~
Some printing plates are quite thin, for example, less than .020" in thickness. The register pin should not : extend above the plate surface. With such a small pin height, engagement of the plate edge with the pin while ma- :
nipulating the plate o~ the magnetic cylinder surface is difficult. Moreover, to avoid having a longitudinal gap ~;
between the plate edges, it i6 necessary that both edge~ be notched to ~it the pin.
Summary o~ the Xnvention In accordance with the invention, the cylinder is proviAed with a retractable register pi~.
; ' ' ~. ' .
~ .
.
'~ ' '`: ~ ;
,. . .i .
. .
6~
~ nother feat~re of the i~vention is that the hole in the cylinder is deflned by a bushing fitted in the cylinder, the register pin being movable radially of the cylinder in -the bushing. An O-ring on the pin moves in a groove on the inner wall of the bushing, limiting the movement of the pin outwardly of the cylinder. A second O-ring on the pin grips the inner wal.l. oE the bushing, preven-ting rotat.ion of the pin.
A further feature of the invention is the method oE
assembly of a retractable plate register pin with a printing cylinder, comprising drilling a hole in an outer surface portion of the cylinder, inserting a bushi~g and pin in the hole, with the pin retracted in the bushing, the bushing and pin extending to abo~e the outer surface portion of the cylinder, finishing the outer surface portion of the cylinder, and causing the bushing and pin to be flush with the finished surface of the cylinder.
Further features and advantages of the invention will readily be apparent from the following specification and from the drawings, in which:
Figure 1 is a diagrammatic perspective of a cylinder with register pins and a printing plate;
Figure 2 is an enlarged fragmentary plan of the cylinder, register pin in extended position and one edge of a printing plate;
Figure 3 i9 a section taken along line 3 - 3 of Figure 2;
Figure 4 is a view similar to Figure 2 with the pin retracted and the pl.ate wrapped around the cylinder;
Figure 5 is a section taken along line 5 - 5 of Figure 4;
~ .
.
.
~6536 Figuxe 6 is a diagram of the pin and a pull tool u6ed in removing the pin from the retracted to extended po-sition; and Yigure 7 illustrates the manufacture of the cylin-der and register pin.
A magnetic cylinde~ for a printing plate or ~or an o~set blanket i~ shown in Peekna Canadian application Serial No. 522,326 filed November 6, 1986, and assigned to the assignee of this invention. The retractable register pin of this application is particularly suited for use in mounting a printing plate on the Peekna p~inting plate cylinder. The register pin may also be used in mounting the blanket and carrier plate on the blanket cylinder, as wel~
as with plates or blankets on other magnetic cylinders.
In Figure 1 a magnetic cylinder ~0 ha~ shafts 11 for mounting in a press. ~egister pins 12 extend radially outwardly ~rom the cy~inder surface. A printing plate 13 of ferromagnetic material has an edge 14 with notches 15 which engage the register pins 12 locating the plate circumferen-tially and longitudinally of the cylinder.
The register pin ~2 i6 shown in extended posit,ion in ~igures 2 and 3, and in retracted position in ~igures 4 ana 5. With the pin 12 extended, the edge 14 of plate 13 is positioned against the 6~de o~ the pin. The plate i6 2S wrapped around 'he cylinder 10, the pin 12 retracted as seen in Figure~ 4 and 5 and the edge 1~ o~ the plate lies adja-cent notched edge ~4.
With a pin diameter o~ the order o~ inch, the notch ~5 may have a depth o~ the order o~ 1/32 inch. The small gap in the plate surface is negligible.
The pin 12 is cylindrical and iB movable radially of the cylinder in a bushing 20 which extends into the cyl-inder through the magnetic structure 21, brass sleeve 22 and into the iron core 23 of the cylinder. There are two spaced .
;.
, :
6~3~i apart groove~ 26, 27 on the outer surface of pin 12 in which0-rings 28, 29, respectively, are received. o-ring 29 îs seated in an elongated groove 30 in the inner wall of bush-ing 20. 0-ring 29 engages the upper end of grooves 30 lim-S iting the movement of pin 12 outwardly to its extended posi-tion, as ~een in Figure 3. For a plate thickness of .015 to .02 inch, the register pin in its extended position may be .05 inch above the cylinder surface. Inward movement of the register pin 1~ i~ limited by engagement of the inner end o~
the pin with the inner surface 32 of the hole in cylinder core 23.
0-ring ~8 i8 compres6ed against the inner wall Or bushing 20 and pre~ents rotakion of ~he register pin. The 0-rings are pre~erably on the outer surf~ce of the pi n rath-er than on the inner surface of the bushing to facilitatemountiny and replacement. The inner end of ~he pin is ta-pered at 33 to facilitate insertion of the pin into the o-rings.
Register pin 12 has a longitudinal bore 34 extend-ing therethrough to relieve fluid pressure inside bushing20. A shoulder 35 $n the bore is engageable by the head 36 of a tool 37, Figure 6, to pull the pin to its extended po-sition. A hole 40 extends laterally through the wall of pin 12 to the longitudl~al bore 34 at a point between the 25 o-ring~ 28, 29. ~h$~ hole reliev~s fluid trapped between the pln a~d the inne~ wall of ~ushing 2~.
~ he cylinder i~ ~abricated with the magnetic struature 21 overslze. The ~ur~ace of the cylinder is then ground or otherwise cut to the desired dimen~ion~ The reg-ister pin 12 i8 assembled wikh the cylinder as a part ofthis operation. Fir~t, a hole is drilled in the cylinder to receive bushing 200 ~he bushing, which is longer than the desired finished dimension, i8 inserted in the hole with its lower end seated on the surface 32 at the base of the hole in the cylinder. Register pin 12 with the 0-rings 28, 29 is3~
mounted thereon iB then in~erted into bushing 20 with its lower end seated on the euxface 32. The length of pin 12 is ~uch that it~ outer end i8 outside the finished surface of the cylinder. The cylinder, bushing 20 and pin 12 are then ground or otherwise cut to the desired fin:Lshed dimension.
The bore 34 through pin 12 is filled with a suitable materL-al, as grease, during the cutting operation to keep metal particles out of the bore and bush.Lng. The grease is re-moved after the cylinder has been cut~ As indicated in F:Lg-ure 7, the rough radius of the cylinder is of the order of3.632" while the finished radius is of the order of 3.607".
The bushing 20 and pin 12 have initial lengths which may be such that they extend beyond the rough surface of the cylin-der.
PRINTING CYLINDER WITH RETR1~CTABLE PI~TE
REGIS~E~ PIN P.ND ME'rHOD O~ ASSEMBLY
Specification : - :
This application relates to a plate register pin ~or positionlng a printing plate on a print:ing cylinder and more particularly to a register pin which is movable between extended and retracted positions and to a method o~ cylinder assembly.
.. . .
Backround of the Invention In 60me pr~ntlng applica~ions the printing plate ~;.
(or blanket) is mounted on a magnetic cylinder and is he~d on the 6urface o~ the cylinder by magnetic attraction. If precise positionlng o~ the plate on the cylinder is impor-~ tant, the cylinder may have one or more register pins which~ ~.
- 15 locate the plate. One such construction is shown in Rosta~
. U.S. Patent No. 3,919,937~
Some printing plates are quite thin, for example, less than .020" in thickness. The register pin should not : extend above the plate surface. With such a small pin height, engagement of the plate edge with the pin while ma- :
nipulating the plate o~ the magnetic cylinder surface is difficult. Moreover, to avoid having a longitudinal gap ~;
between the plate edges, it i6 necessary that both edge~ be notched to ~it the pin.
Summary o~ the Xnvention In accordance with the invention, the cylinder is proviAed with a retractable register pi~.
; ' ' ~. ' .
~ .
.
'~ ' '`: ~ ;
,. . .i .
. .
6~
~ nother feat~re of the i~vention is that the hole in the cylinder is deflned by a bushing fitted in the cylinder, the register pin being movable radially of the cylinder in -the bushing. An O-ring on the pin moves in a groove on the inner wall of the bushing, limiting the movement of the pin outwardly of the cylinder. A second O-ring on the pin grips the inner wal.l. oE the bushing, preven-ting rotat.ion of the pin.
A further feature of the invention is the method oE
assembly of a retractable plate register pin with a printing cylinder, comprising drilling a hole in an outer surface portion of the cylinder, inserting a bushi~g and pin in the hole, with the pin retracted in the bushing, the bushing and pin extending to abo~e the outer surface portion of the cylinder, finishing the outer surface portion of the cylinder, and causing the bushing and pin to be flush with the finished surface of the cylinder.
Further features and advantages of the invention will readily be apparent from the following specification and from the drawings, in which:
Figure 1 is a diagrammatic perspective of a cylinder with register pins and a printing plate;
Figure 2 is an enlarged fragmentary plan of the cylinder, register pin in extended position and one edge of a printing plate;
Figure 3 i9 a section taken along line 3 - 3 of Figure 2;
Figure 4 is a view similar to Figure 2 with the pin retracted and the pl.ate wrapped around the cylinder;
Figure 5 is a section taken along line 5 - 5 of Figure 4;
~ .
.
.
~6536 Figuxe 6 is a diagram of the pin and a pull tool u6ed in removing the pin from the retracted to extended po-sition; and Yigure 7 illustrates the manufacture of the cylin-der and register pin.
A magnetic cylinde~ for a printing plate or ~or an o~set blanket i~ shown in Peekna Canadian application Serial No. 522,326 filed November 6, 1986, and assigned to the assignee of this invention. The retractable register pin of this application is particularly suited for use in mounting a printing plate on the Peekna p~inting plate cylinder. The register pin may also be used in mounting the blanket and carrier plate on the blanket cylinder, as wel~
as with plates or blankets on other magnetic cylinders.
In Figure 1 a magnetic cylinder ~0 ha~ shafts 11 for mounting in a press. ~egister pins 12 extend radially outwardly ~rom the cy~inder surface. A printing plate 13 of ferromagnetic material has an edge 14 with notches 15 which engage the register pins 12 locating the plate circumferen-tially and longitudinally of the cylinder.
The register pin ~2 i6 shown in extended posit,ion in ~igures 2 and 3, and in retracted position in ~igures 4 ana 5. With the pin 12 extended, the edge 14 of plate 13 is positioned against the 6~de o~ the pin. The plate i6 2S wrapped around 'he cylinder 10, the pin 12 retracted as seen in Figure~ 4 and 5 and the edge 1~ o~ the plate lies adja-cent notched edge ~4.
With a pin diameter o~ the order o~ inch, the notch ~5 may have a depth o~ the order o~ 1/32 inch. The small gap in the plate surface is negligible.
The pin 12 is cylindrical and iB movable radially of the cylinder in a bushing 20 which extends into the cyl-inder through the magnetic structure 21, brass sleeve 22 and into the iron core 23 of the cylinder. There are two spaced .
;.
, :
6~3~i apart groove~ 26, 27 on the outer surface of pin 12 in which0-rings 28, 29, respectively, are received. o-ring 29 îs seated in an elongated groove 30 in the inner wall of bush-ing 20. 0-ring 29 engages the upper end of grooves 30 lim-S iting the movement of pin 12 outwardly to its extended posi-tion, as ~een in Figure 3. For a plate thickness of .015 to .02 inch, the register pin in its extended position may be .05 inch above the cylinder surface. Inward movement of the register pin 1~ i~ limited by engagement of the inner end o~
the pin with the inner surface 32 of the hole in cylinder core 23.
0-ring ~8 i8 compres6ed against the inner wall Or bushing 20 and pre~ents rotakion of ~he register pin. The 0-rings are pre~erably on the outer surf~ce of the pi n rath-er than on the inner surface of the bushing to facilitatemountiny and replacement. The inner end of ~he pin is ta-pered at 33 to facilitate insertion of the pin into the o-rings.
Register pin 12 has a longitudinal bore 34 extend-ing therethrough to relieve fluid pressure inside bushing20. A shoulder 35 $n the bore is engageable by the head 36 of a tool 37, Figure 6, to pull the pin to its extended po-sition. A hole 40 extends laterally through the wall of pin 12 to the longitudl~al bore 34 at a point between the 25 o-ring~ 28, 29. ~h$~ hole reliev~s fluid trapped between the pln a~d the inne~ wall of ~ushing 2~.
~ he cylinder i~ ~abricated with the magnetic struature 21 overslze. The ~ur~ace of the cylinder is then ground or otherwise cut to the desired dimen~ion~ The reg-ister pin 12 i8 assembled wikh the cylinder as a part ofthis operation. Fir~t, a hole is drilled in the cylinder to receive bushing 200 ~he bushing, which is longer than the desired finished dimension, i8 inserted in the hole with its lower end seated on the surface 32 at the base of the hole in the cylinder. Register pin 12 with the 0-rings 28, 29 is3~
mounted thereon iB then in~erted into bushing 20 with its lower end seated on the euxface 32. The length of pin 12 is ~uch that it~ outer end i8 outside the finished surface of the cylinder. The cylinder, bushing 20 and pin 12 are then ground or otherwise cut to the desired fin:Lshed dimension.
The bore 34 through pin 12 is filled with a suitable materL-al, as grease, during the cutting operation to keep metal particles out of the bore and bush.Lng. The grease is re-moved after the cylinder has been cut~ As indicated in F:Lg-ure 7, the rough radius of the cylinder is of the order of3.632" while the finished radius is of the order of 3.607".
The bushing 20 and pin 12 have initial lengths which may be such that they extend beyond the rough surface of the cylin-der.
Claims (16)
1. In a printing cylinder having a peripheral surface and magnet structure for holding a thin elongate printing plate thereon, two retractable plate register pins comprising:
means defining a hole for each pin in said cylin-der, said holes extending radially inwardly through said peripheral surface such that the register pins being spaced apart along a line parallel with the cylinder axis; and a pin slidably mounted in each hole for selective disposition in an extended position with an outer portion of the pin extending to above the cylinder surface a distance greater than the thickness of the printing plate for engage-ment with said printing plate for proper alignment of the printing plate and in a retracted position in which the pin outer portion does not extend above the cylinder surface a distance greater than the thickness of the printing plate, wherein the printing plate is positioned against the register pins for proper alignment while the magnetic structure of the cylinder simultaneously forces the plate down and around the cylinder surface.
means defining a hole for each pin in said cylin-der, said holes extending radially inwardly through said peripheral surface such that the register pins being spaced apart along a line parallel with the cylinder axis; and a pin slidably mounted in each hole for selective disposition in an extended position with an outer portion of the pin extending to above the cylinder surface a distance greater than the thickness of the printing plate for engage-ment with said printing plate for proper alignment of the printing plate and in a retracted position in which the pin outer portion does not extend above the cylinder surface a distance greater than the thickness of the printing plate, wherein the printing plate is positioned against the register pins for proper alignment while the magnetic structure of the cylinder simultaneously forces the plate down and around the cylinder surface.
2. The printing cylinder of claim 1 in which the pins, in the retracted position, are flush with said cylinder surface.
3. The printing cylinder and register pins of claim 1 in combination with a printing plate of ferromagnetic material having an edge surface and being registered on the cylinder by engagement of said edge surface of the plate with said pins in its extended position, the plate being wrapped around the cylinder and held thereon by magnetic attraction, the plate edge opposite said one plate edge lying closely adjacent said one plate edge with said pins in the retracted position.
4. The cylinder and printing plate of claim 3 in which said one plate edge has two notches therein which com-plements said register pins to position the plate peripheral-ly and axially on the cylinder.
5. The cylinder and plate of claim 4 in which said pins are cylindrical and the notches in the plate edge have an angular extent less than 180°.
6. The printing cylinder of claim 1 in which the means defining a hole for each pin in the cylin-der includes a bushing fitted in the cylinder with each register pin being movable radially of the cylinder in the bushing.
7. The printing cylinder of claim 6 including means providing complementary surfaces to limit movement of the pins outwardly of the cylinder.
8. The printing cylinder of claim 7 in which said last mentioned means comprises an o-ring on each pin which moves in an annular groove in the inner wall of the bushing.
9. The printing cylinder of claim 6 including an o-ring on each pin to grip the inner wall of said bushing, preventing rotation of the pins.
10. The printing cylinder of claim 6, including:
two spaced apart peripheral grooves on each pin;
an O-ring in each groove; and a groove on the inner wall of said bushing, receiv-ing one of said O-rings to limit movement of the pins out-wardly of the cylinder, the other O-ring engaging the inner wall of said bushing to prevent rotation of the pins.
two spaced apart peripheral grooves on each pin;
an O-ring in each groove; and a groove on the inner wall of said bushing, receiv-ing one of said O-rings to limit movement of the pins out-wardly of the cylinder, the other O-ring engaging the inner wall of said bushing to prevent rotation of the pins.
11. The printing cylinder of claim 6 in which each pin has a bore extending axially thereof, the bore having a surface for engagement with a complementary surface on a tool to move the pins outwardly of the cylinder to the extended position.
12. The printing cylinder of claim 6 in which each pin has an axial bore therein with a relief hole extending laterally through the pin wall.
13. The method of assembly of a retractable plate register pin with a printing cylinder, comprising:
drilling a hole in an outer surface portion of the cylinder;
inserting a bushing and pin in said hole, with the pin retracted in the bushing, said bushing and pins extending to above said outer surface portion of the cylinder;
finishing the outer surface portion of the cylin-der; and causing the bushing and pin to be flush with the finished surface of the cylinder.
drilling a hole in an outer surface portion of the cylinder;
inserting a bushing and pin in said hole, with the pin retracted in the bushing, said bushing and pins extending to above said outer surface portion of the cylinder;
finishing the outer surface portion of the cylin-der; and causing the bushing and pin to be flush with the finished surface of the cylinder.
14. The method of claim 13 in which said pin has an axial bore, the method including the step of filling said bore with a removable material before cutting the bushing and pin.
15. The method of claim 14 including the step of thereafter removing the material from the bore of the pin.
16. The method of claim 13 wherein said steps of finishing the outer surface portion and causing the bushing and pin to be flush with the finished outer surface portion are concurrently performed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82697886A | 1986-02-07 | 1986-02-07 | |
| US826,978 | 1986-02-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1286536C true CA1286536C (en) | 1991-07-23 |
Family
ID=25247999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000528988A Expired - Lifetime CA1286536C (en) | 1986-02-07 | 1987-02-04 | Printing cylinder with retractable plate register pin and method of assembly |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0236741A3 (en) |
| JP (1) | JPH074920B2 (en) |
| CA (1) | CA1286536C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2626214B1 (en) * | 1988-01-21 | 1995-05-12 | Nouel Jean Marie | METHOD FOR HANGING AND POSITIONING OFFSET PRINTING PLATES WITH MAGNETIC SUPPORT, AS WELL AS OFFSET PRINTING PLATES AND MACHINES FOR USE THEREOF |
| US4890553A (en) * | 1989-02-16 | 1990-01-02 | Heath Custom Press, Inc. | Positioning and attachment means for flexible printing plates |
| JPH0686120B2 (en) * | 1990-11-01 | 1994-11-02 | ビー・ジェー・トレーディング有限会社 | Imprinter plate mounting method and apparatus |
| DE4401269A1 (en) * | 1994-01-18 | 1995-07-20 | Roland Man Druckmasch | Method and device for the correct positioning of printing form sleeves |
| US6116160A (en) * | 1998-03-13 | 2000-09-12 | Iris Graphics, Inc. | Printer drum |
| DE10123325B4 (en) * | 2001-05-12 | 2005-12-15 | Koenig & Bauer Ag | Transfer cylinder of a printing press |
| JP4925470B2 (en) * | 2008-07-01 | 2012-04-25 | 雅幸 井爪 | Plate making machine for printing press |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3456587A (en) * | 1966-04-11 | 1969-07-22 | American Photocopy Equip Co | Plate cylinder with retractable register pins |
| DE1611383A1 (en) * | 1967-10-06 | 1970-12-10 | Koenig & Bauer Schnellpressfab | Process for applying offset plates with holes in register to plate cylinders of offset printing units |
| DD99535A1 (en) * | 1972-10-10 | 1973-08-20 | ||
| US3882775A (en) * | 1973-07-02 | 1975-05-13 | World Color Press | Registration system for thin magnetic printing plates |
-
1987
- 1987-02-04 CA CA000528988A patent/CA1286536C/en not_active Expired - Lifetime
- 1987-02-05 EP EP87101554A patent/EP0236741A3/en not_active Withdrawn
- 1987-02-06 JP JP2492587A patent/JPH074920B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0236741A3 (en) | 1989-04-05 |
| EP0236741A2 (en) | 1987-09-16 |
| JPS62246731A (en) | 1987-10-27 |
| JPH074920B2 (en) | 1995-01-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |