CA2258331A1 - Variable cutoff offset press unit - Google Patents
Variable cutoff offset press unit Download PDFInfo
- Publication number
- CA2258331A1 CA2258331A1 CA 2258331 CA2258331A CA2258331A1 CA 2258331 A1 CA2258331 A1 CA 2258331A1 CA 2258331 CA2258331 CA 2258331 CA 2258331 A CA2258331 A CA 2258331A CA 2258331 A1 CA2258331 A1 CA 2258331A1
- Authority
- CA
- Canada
- Prior art keywords
- blanket
- cylinder sleeve
- press
- nip
- sleeve
- 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.)
- Granted
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
- B41F13/44—Arrangements to accommodate interchangeable cylinders of different sizes to enable machine to print on areas of different sizes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
A fixed cutoff press is adapted to a variable cutoff press while maintaining thesize of the blanket cylinders. A plate cylinder is mounted on a frame and includes a plate cylinder sleeve and a blanket cylinder is mounted on the frame, includes with a gapless blanket cylinder sleeve. The gapless blanket sleeve contacts the plate cylinder sleeve at a first nip. The press has an impression plate mounted on the frame in the case of a non-perfecting press or an identical, mirror image assembly of plate and blanket cylinders in the case of a perfecting press. A material to be printed passes through a second nip. Inkers are provided for transferring an ink film to the plate cylinder sleeve, the ink pattern being subsequently transferred to the blanket cylinder sleeve at the first nip and the ink pattern being subsequently transferred from the blanket cylinder sleeve to the material to be printed at the second nip. The press also includes drivers to drive in rotation the plate cylinder and drivers to drive in rotation the blanket cylinder. A
controller is provided for controlling each of the drivers so that the surface speed of the sleeve of the plate cylinder and the surface speed of the blanket cylinder sleeve are equal at the first nip. The plate cylinder sleeve is variable, whereby a length of an image to be printed is varied proportionally to the variable outer diameter while maintaining the outer diameter of the gapless blanket cylinder sleeve constant. Accordingly, since the size of the blanket is fixed and offset presses presently require changing plates for each job, changes in cutoff are made in a manner similar to today, i.e. plates but not blankets are changed for each job. Ideally, the residual ink on the blanket, once the image is transferred to the web, is small enough that a secondary image will not appear on the web. The invention also provides for the inclusion of a blanket washer or scrapper, which continually removes the residual ink and recirculates it through the ink train to avoid any secondary images.
controller is provided for controlling each of the drivers so that the surface speed of the sleeve of the plate cylinder and the surface speed of the blanket cylinder sleeve are equal at the first nip. The plate cylinder sleeve is variable, whereby a length of an image to be printed is varied proportionally to the variable outer diameter while maintaining the outer diameter of the gapless blanket cylinder sleeve constant. Accordingly, since the size of the blanket is fixed and offset presses presently require changing plates for each job, changes in cutoff are made in a manner similar to today, i.e. plates but not blankets are changed for each job. Ideally, the residual ink on the blanket, once the image is transferred to the web, is small enough that a secondary image will not appear on the web. The invention also provides for the inclusion of a blanket washer or scrapper, which continually removes the residual ink and recirculates it through the ink train to avoid any secondary images.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2258331 CA2258331C (en) | 1998-01-23 | 1999-01-19 | Variable cutoff offset press unit |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002224762A CA2224762A1 (en) | 1998-01-23 | 1998-01-23 | Variable cutoff press unit |
CA2,224,762 | 1998-01-23 | ||
CA 2258331 CA2258331C (en) | 1998-01-23 | 1999-01-19 | Variable cutoff offset press unit |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2258331A1 true CA2258331A1 (en) | 1999-07-23 |
CA2258331C CA2258331C (en) | 2003-12-30 |
Family
ID=29585063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2258331 Expired - Fee Related CA2258331C (en) | 1998-01-23 | 1999-01-19 | Variable cutoff offset press unit |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2258331C (en) |
-
1999
- 1999-01-19 CA CA 2258331 patent/CA2258331C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2258331C (en) | 2003-12-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |