CA2357454C - Cylinder for receiving a printing form - Google Patents
Cylinder for receiving a printing form Download PDFInfo
- Publication number
- CA2357454C CA2357454C CA002357454A CA2357454A CA2357454C CA 2357454 C CA2357454 C CA 2357454C CA 002357454 A CA002357454 A CA 002357454A CA 2357454 A CA2357454 A CA 2357454A CA 2357454 C CA2357454 C CA 2357454C
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- printing form
- gap
- printing
- edges
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/10—Forme cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Ink Jet (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Handling Of Cut Paper (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
1. Cylinder for receiving a printing form.
2.1 The object of the invention is to develop a cylinder for receiving a printing form, which makes it possible at little outlay to tension-mount a printing form uniformly and without any movement.
2.2 According to the invention, in the case of a cylinder having a gap with gap edges which projects into the interior of the cylinder and extends in the direction of the generatrices of the cylinder and through which the ends of the printing form are led and which contains a device for tensioning the printing form on the outer surface of the cylinder, at least one of the gap edges (2, 3, 13, 14) is designed to be curved in order to achieve tensioning forces (7) which are constant essentially over the width (b) of the printing form (1, 16).
2.3 The invention can be used in printing machines having a printing form cylinder which is designed, in particular, for receiving printing films.
3. Figure 2
2.1 The object of the invention is to develop a cylinder for receiving a printing form, which makes it possible at little outlay to tension-mount a printing form uniformly and without any movement.
2.2 According to the invention, in the case of a cylinder having a gap with gap edges which projects into the interior of the cylinder and extends in the direction of the generatrices of the cylinder and through which the ends of the printing form are led and which contains a device for tensioning the printing form on the outer surface of the cylinder, at least one of the gap edges (2, 3, 13, 14) is designed to be curved in order to achieve tensioning forces (7) which are constant essentially over the width (b) of the printing form (1, 16).
2.3 The invention can be used in printing machines having a printing form cylinder which is designed, in particular, for receiving printing films.
3. Figure 2
Description
A-29x1 Cylinder for receiving a printing form DeBCription The invention relates to a cylinder for receiving a printing form, in particular for receiving a printing film for offset printing.
Known printing form cylinders have, inside them, systems for winding printing film onto and unwinding it from reels.
Starting from the unwinding reel, the film is led outward through a alit-like gap. The film is looped around the outer surface of the cylinder and is led back through the same gap or a further gap into the interior and onto the winding reel.
During this time, efforts are made to tension the film uniformly on the cylinder, for which purpose high tension forces take effect in order to overcome the friction between the film underside and the outer surface (DE 27 S6 388, DE 42 24 332 A1, DE 43 29 125 C1).
The disadvantage of the known solutions is that, despite high tension forces, the film site moveably on the outer surface of the printing form cylinder. This leads, during printing, to the wear of the film and to printing errors.
The object of the invention ie to develop a cylinder for receiving a printing form, which makes it possible at little outlay to tension-mount a printing form uniformly and without any movement.
The object is achieved by means of a cylinder which is equipped with at least one of the gap edges of a cylinder having a curved design across the cylinder.
With this arrangement, it is possible to tension-mount a printing form, in particular a printing film, on the outer surface, in such a way that there is essentially uniform tension in the printing form over its width.
The invention will be explained in more detail by means of an exemplary embodiment, and in the drawing:
Figure 1 shows the tension distribution in a printing film 1 in the case of a cylinder with rectilinear gap edges 2, 3.
Figure 2, 3 shows two views of a cylinder with cambered gap edges.
Figure 1 illustrates a diagram of the tension distribution in a printing film 1 in the case of a printing form cylinder with rectilinear gap edges 2, 3. That region of the printing film 1 which rests on the outer surface lies, laid out in one plane, between the gap edges 2, 3 and has the length 1 and the width b. The printing film 1 is tensioned via the gap edges 2, 3 between an unwinding roller 4 and a winding roller 5. For this purpose, the winding roller 5 can be coupled to a motor and the unwinding roller 4 to a braking device. Figure 1 also shows the tension distribution in the printing film 1 along the width b. The tension vectors 7 point in the circumferential direction of a cylinder. The tension vectors 7 are of greater amount in the vicinity of the edges 8, 9 of the printing film than in the surroundings of the center Line 10 of the printing film 1. The result of this nonuniform tension distribution is that the printing film 1 adheres lees firmly to the outer surface of the cylinder in the surroundings of the center line 10 than in the vicinity of the edges 8, 9. In interaction with a further cylinder, the printing film 1 may slip on the outer surface, and this may lead to register errors during printing. The printing form cylinder should not have any dimensional deviations in the radial direction, so that compensation of the nonuniform tension distribution is not possible in the radial direction.
Compensation of the different tensions is achieved by means of cambered gap edges, as illustrated in more detail in Figures 2 and 3. Figure 2 shows a cross section through a cylinder 11 with a gap 12 which has gap edges 13 and 14. A stock reel 15 for printing film 16 is located within the cylinder 11. The web-like printing film 16 1e lead, starting from the stock reel 15, through the gap 12 via the gap edge 14 and is looped around the outer surface 17 of the cylinder 11. The other end of the printing film 16 is led via the gap edge 15 and the gap 12 into the interior of the cylinder 11 and onto a winding reel 18.
As seen in the direction A, Figure 3 shows the cambered or curved design of the gap edges 13, 14. The curvatures of the gap edges 13, 14 are such that they project in the region of the center line 19 of the printing film 16 laid symmetrically onto the outer surface 17 of the cylinder 11. The gap 12 is narrawed in this region. The gap edges 13, 14 are set back in the direction of the edges 20, 21 of the printing film 16, so that the gap 12 is wider than in the center. The curvature dimension for the gap edges 13, 14 ie derived from the correction values necessary for uniform tension distribution.
Uniform tension distribution ie Obtained in that, in the case of cambered gap edges 13, 14, the tensile forces on the printing film 16 are correctively increased in the surroundings of the center line 19, as compared with the edge regions. The tensile forces may be generated in a conventional way by means of a winding drive which is coupled to the winding reel 18. As already described above, during tensioning the stock reel may be coupled to a braking device or be blocked by means of the winding drive.
The positive effect of tension compensation occurs even when only one of the gap edges 13, 14 ie cambered, In order to improve the tensioning operation, measures may be taken which reduce the friction of the printing film 16 on the outer surface 17 and via the gap edges 13, 14. For example, the gap edges 13, 14 may be rounded and be designed to have low friction. Furthermore, roller elements could be used, via which the printing film 16 is led at the gap edges 13, 14, the roller elements assuming the convex shape of the gap edges 13, 14. Tn the case of cylinders having a plurality of gaps 12, the gap edges 13, 14 may uniformly be cambered, as described above.
Known printing form cylinders have, inside them, systems for winding printing film onto and unwinding it from reels.
Starting from the unwinding reel, the film is led outward through a alit-like gap. The film is looped around the outer surface of the cylinder and is led back through the same gap or a further gap into the interior and onto the winding reel.
During this time, efforts are made to tension the film uniformly on the cylinder, for which purpose high tension forces take effect in order to overcome the friction between the film underside and the outer surface (DE 27 S6 388, DE 42 24 332 A1, DE 43 29 125 C1).
The disadvantage of the known solutions is that, despite high tension forces, the film site moveably on the outer surface of the printing form cylinder. This leads, during printing, to the wear of the film and to printing errors.
The object of the invention ie to develop a cylinder for receiving a printing form, which makes it possible at little outlay to tension-mount a printing form uniformly and without any movement.
The object is achieved by means of a cylinder which is equipped with at least one of the gap edges of a cylinder having a curved design across the cylinder.
With this arrangement, it is possible to tension-mount a printing form, in particular a printing film, on the outer surface, in such a way that there is essentially uniform tension in the printing form over its width.
The invention will be explained in more detail by means of an exemplary embodiment, and in the drawing:
Figure 1 shows the tension distribution in a printing film 1 in the case of a cylinder with rectilinear gap edges 2, 3.
Figure 2, 3 shows two views of a cylinder with cambered gap edges.
Figure 1 illustrates a diagram of the tension distribution in a printing film 1 in the case of a printing form cylinder with rectilinear gap edges 2, 3. That region of the printing film 1 which rests on the outer surface lies, laid out in one plane, between the gap edges 2, 3 and has the length 1 and the width b. The printing film 1 is tensioned via the gap edges 2, 3 between an unwinding roller 4 and a winding roller 5. For this purpose, the winding roller 5 can be coupled to a motor and the unwinding roller 4 to a braking device. Figure 1 also shows the tension distribution in the printing film 1 along the width b. The tension vectors 7 point in the circumferential direction of a cylinder. The tension vectors 7 are of greater amount in the vicinity of the edges 8, 9 of the printing film than in the surroundings of the center Line 10 of the printing film 1. The result of this nonuniform tension distribution is that the printing film 1 adheres lees firmly to the outer surface of the cylinder in the surroundings of the center line 10 than in the vicinity of the edges 8, 9. In interaction with a further cylinder, the printing film 1 may slip on the outer surface, and this may lead to register errors during printing. The printing form cylinder should not have any dimensional deviations in the radial direction, so that compensation of the nonuniform tension distribution is not possible in the radial direction.
Compensation of the different tensions is achieved by means of cambered gap edges, as illustrated in more detail in Figures 2 and 3. Figure 2 shows a cross section through a cylinder 11 with a gap 12 which has gap edges 13 and 14. A stock reel 15 for printing film 16 is located within the cylinder 11. The web-like printing film 16 1e lead, starting from the stock reel 15, through the gap 12 via the gap edge 14 and is looped around the outer surface 17 of the cylinder 11. The other end of the printing film 16 is led via the gap edge 15 and the gap 12 into the interior of the cylinder 11 and onto a winding reel 18.
As seen in the direction A, Figure 3 shows the cambered or curved design of the gap edges 13, 14. The curvatures of the gap edges 13, 14 are such that they project in the region of the center line 19 of the printing film 16 laid symmetrically onto the outer surface 17 of the cylinder 11. The gap 12 is narrawed in this region. The gap edges 13, 14 are set back in the direction of the edges 20, 21 of the printing film 16, so that the gap 12 is wider than in the center. The curvature dimension for the gap edges 13, 14 ie derived from the correction values necessary for uniform tension distribution.
Uniform tension distribution ie Obtained in that, in the case of cambered gap edges 13, 14, the tensile forces on the printing film 16 are correctively increased in the surroundings of the center line 19, as compared with the edge regions. The tensile forces may be generated in a conventional way by means of a winding drive which is coupled to the winding reel 18. As already described above, during tensioning the stock reel may be coupled to a braking device or be blocked by means of the winding drive.
The positive effect of tension compensation occurs even when only one of the gap edges 13, 14 ie cambered, In order to improve the tensioning operation, measures may be taken which reduce the friction of the printing film 16 on the outer surface 17 and via the gap edges 13, 14. For example, the gap edges 13, 14 may be rounded and be designed to have low friction. Furthermore, roller elements could be used, via which the printing film 16 is led at the gap edges 13, 14, the roller elements assuming the convex shape of the gap edges 13, 14. Tn the case of cylinders having a plurality of gaps 12, the gap edges 13, 14 may uniformly be cambered, as described above.
Claims (6)
1. A cylinder for receiving a printing form, containing a gap with gap edges which projects into the interior of the cylinder and extends in the direction of the generatrices of the cylinder and through which the ends of the printing form are led, and containing a device for tensioning the printing form on the outer surface of the cylinder, characterized in that, in order to achieve tensioning forces (7) which are constant essentially over the width (b) of the printing form (1, 16), at least one of the gap edges (2, 3, 13, 14) is designed to be curved.
2. The cylinder as claimed in claim 1, characterized in that the curvature projects in the circumferential direction of the cylinder (11) in the region of the center (10, 19) of the printing form (1, 16) and decreases in the side regions (8, 9, 20, 21) of the printing form (1, 16).
3. The cylinder as claimed in claim 1, characterized in that, when a tensioning device acting at both ends of the printing form (1, 16) is used, both gap edges (2, 3, 13, 14) are designed to be cambered, the distance between the gap edges (2, 3, 13, 14) being reduced in the region of the center (10, 19) of the printing form 1, 16) and increasing continuously toward the side regions (8, 9, 20, 21) of the printing form (1, 16).
4. The cylinder as claimed in claim 1, 2 or 3, characterized in that the gap edges (2, 3, 13, 14) in cross section have a rounded end to reduce friction with the printing form.
5. The cylinder as claimed in claim 1 or 4, characterized in that the gap edges (2, 3, 13, 14) area designed to have a low coefficient of friction.
6. The cylinder as claimed in claim 5, characterized in that, in order to reduce the friction along the curved gap edge (2, 3, 13, 14) roller elements are produced which essentially carry the printing form 1, 16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10046732.6 | 2000-09-21 | ||
| DE10046732A DE10046732A1 (en) | 2000-09-21 | 2000-09-21 | Cylinder for holding a printing form |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2357454A1 CA2357454A1 (en) | 2002-03-21 |
| CA2357454C true CA2357454C (en) | 2007-05-08 |
Family
ID=7657057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002357454A Expired - Fee Related CA2357454C (en) | 2000-09-21 | 2001-09-19 | Cylinder for receiving a printing form |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1190853B1 (en) |
| JP (1) | JP2002144520A (en) |
| AT (1) | ATE321663T1 (en) |
| CA (1) | CA2357454C (en) |
| DE (2) | DE10046732A1 (en) |
| IL (1) | IL145312A0 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2720673B2 (en) * | 1977-05-07 | 1979-09-06 | Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg | Device for uneven tensioning of a rubber blanket in an offset printing machine |
| DE2756388A1 (en) * | 1977-12-17 | 1979-06-21 | Eisbein Develop | DRUM FOR ELECTROGRAPHIC EQUIPMENT |
| DE3114580A1 (en) * | 1981-04-10 | 1982-10-28 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Device for the uneven attachment of the blanket to the cylinder of an offset printing machine |
| DE4224332A1 (en) * | 1992-07-23 | 1994-01-27 | Heidelberger Druckmasch Ag | Plate cylinder for offset rotary printing press - has optical or electrical image system for printing film and film replacement by take-up roll from roll of fresh film |
| DE4329125C1 (en) * | 1993-08-30 | 1995-01-05 | Heidelberger Druckmasch Ag | Device for renewing a printing foil on the outer surface of a forme cylinder |
| DE4429210A1 (en) * | 1994-08-18 | 1996-02-22 | Roland Man Druckmasch | Forme cylinder in a rotary printing machine |
-
2000
- 2000-09-21 DE DE10046732A patent/DE10046732A1/en not_active Withdrawn
-
2001
- 2001-08-29 EP EP01119798A patent/EP1190853B1/en not_active Expired - Lifetime
- 2001-08-29 DE DE50109355T patent/DE50109355D1/en not_active Expired - Lifetime
- 2001-08-29 AT AT01119798T patent/ATE321663T1/en not_active IP Right Cessation
- 2001-09-06 IL IL14531201A patent/IL145312A0/en not_active IP Right Cessation
- 2001-09-19 CA CA002357454A patent/CA2357454C/en not_active Expired - Fee Related
- 2001-09-21 JP JP2001288533A patent/JP2002144520A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ATE321663T1 (en) | 2006-04-15 |
| EP1190853A2 (en) | 2002-03-27 |
| CA2357454A1 (en) | 2002-03-21 |
| EP1190853B1 (en) | 2006-03-29 |
| JP2002144520A (en) | 2002-05-21 |
| IL145312A0 (en) | 2002-06-30 |
| DE50109355D1 (en) | 2006-05-18 |
| EP1190853A3 (en) | 2003-02-05 |
| DE10046732A1 (en) | 2002-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |