CA2258331A1 - Variable cutoff offset press unit - Google Patents

Variable cutoff offset press unit Download PDF

Info

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
Application number
CA 2258331
Other languages
French (fr)
Other versions
CA2258331C (en
Inventor
Bob Erbstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imprimeries Transcontinental Inc/transcontinental Printing Inc
Original Assignee
Imprimeries Transcontinental Inc/transcontinental Printing Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CA002224762A external-priority patent/CA2224762A1/en
Application filed by Imprimeries Transcontinental Inc/transcontinental Printing Inc filed Critical Imprimeries Transcontinental Inc/transcontinental Printing Inc
Priority to CA 2258331 priority Critical patent/CA2258331C/en
Publication of CA2258331A1 publication Critical patent/CA2258331A1/en
Application granted granted Critical
Publication of CA2258331C publication Critical patent/CA2258331C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA 2258331 1998-01-23 1999-01-19 Variable cutoff offset press unit Expired - Fee Related CA2258331C (en)

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)

Also Published As

Publication number Publication date
CA2258331C (en) 2003-12-30

Similar Documents

Publication Publication Date Title
US4421027A (en) Multiple printing mode printing machine system
US4782753A (en) Printing couple for newspaper and periodical printing
CA2280646A1 (en) Machine for the security printing of security papers
US5950536A (en) Variable cutoff offset press unit
JP2846124B2 (en) Printing equipment equipped with a short-path type inking device for a direct printing rotary printing press using dry lithography
DE69909197D1 (en) More colors gravure printing press
CA2350240A1 (en) Multi-color printing press with common blanket cylinder
US6886461B2 (en) Short inking system for a rotary printing machine
US5907997A (en) Multi-color printing press for printing single or dual webs
CA2344938A1 (en) Continuous image transfer belt and variable image size offset printing system
CA1202523A (en) Print tower for a sheet-fed offset rotary printing press
CN101495314B (en) Printing unit of a web-fed rotary printing press
EP1182035A3 (en) Apparatus for registration of multicolor printing images in a web-fed offset press
CA2258331A1 (en) Variable cutoff offset press unit
JPH03169555A (en) Method to prepare for printing for printing device and usable printing device therefor
US20070272104A1 (en) Coating device
JPS60127154A (en) Sheet-fed offset press
JP2746540B2 (en) Printing mechanism of web offset press
JP2578077B2 (en) Newspaper rotary printing equipment
CA2384415A1 (en) Printing unit with reversible image setting and digital changeover
GB2094717A (en) Collect-printing unit for security printing for use in a rotary printing press
US20060037500A1 (en) Printing unit and inking unit
JPH11254845A (en) Coating unit for printing machine and letterpress printing plate
GB2094718A (en) Collect-printing unit for security printing for use in a rotary printing press
CA2523834A1 (en) Offset printing press

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed