US 4,889,051 AGranted

Removable inking device for offset press

OwnerJean-Claude Sardainventor

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Abstract

A detachable printing unit for offset printing presses, which can be incorporated during their manufacture or fitted to existing presses, said unit being defined in that it is composed of an independent inking module 16 (FIG. 3) comprising all the components required for effecting in chronological operating order the moistening and inking of an offset plate ready for printing on a blanket, and a likewise independent detachable blanket cylinder 7C. One embodiment of the invention is defined in that the numbering device with which the press is equipped (FIG. 6, View B) is replaced by the blanket cylinder (FIG. 7, View B) of the printing unit working with the inking module 16 (FIG. 3), and use is made of the drive mechanism 8 (FIG. 6) and pressure adjustment mechanism 9B provided in the press to obtain for each printing cycle, instead of the numbering, an additional color obtained by color superimposition with the aid of the pressure cylinder 4. In the other form of the invention the same inking module, disposed in another position in the press, works conjointly with the blanket cylinder 3 of the press to enable for each printing cycle an additional color and optionally letterpress numbering or an additional letterpress color to be achieved.

In a printing press having:

a plate cylinder;
a means for linking said plate cylinder in a first color with a first ink;
a blanket cylinder in circumferential contact with said plate cylinder for receiving images from said plate cylinder in said first ink;
a pressure cylinder in adjustable circumferential contact with said blanket cylinder;
a feed means for drawing paper between said pressure cylinder and said blanket cylinder to deposit said images in said first ink on said paper;
a drive means for rotating said plate cylinder, blanket cylinder, and said pressure cylinder;
a detachable dual mode numbering and coloring device including a inking unit in circumferential contact with a removable numbering cylinder, said removable numbering cylinder being in circumferential contact with said pressure cylinder and rotated by said drive means, for printing page numbers on said paper drawn between said removable numbering cylinder and said pressure cylinder when in a numbering mode, and with said inking unit in circumferential contact with a removable coloring cylinder, said removable coloring cylinder being in circumferential contact with said pressure cylinder and rotated by said drive means, for printing images in a second ink of a second color on said paper drawn between said removable coloring cylinder and said pressure cylinder when in a coloring mode;
the improvement comprising:
a removable auxiliary blanket cylinder adapted for attachment in the press in the location provided for the removable numbering and coloring cylinders, and for rotation by said drive means;
and
a movable inking module coupled to said printing press, including an inking unit, a damping unit, and an auxiliary plate cylinder, operable in a first mode with said auxiliary plate cylinder in circumferential contact with said auxiliary blanket cylinder for depositing images in a third ink of a third color on said paper, and operable in a second mode with said auxiliary plate cylinder in circumferential contact with said blanket cylinder for depositing images in a third ink of a third color on said paper while allowing simultaneous operation of said detachable dual mode numbering and color device.

8 more elements

Facts

Application

07/224,071Filed 25 Jul 1988

Priority

FR 87 109723 Aug 1987

Granted

26 Dec 1989

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

B41F 33/045
Tripping devices or stop-motions: for starting or stopping operation of numbering devices
B41F 7/08
For offset printing: using one transfer cylinder co-operating with several forme cylinders for printing on sheets or webs, e.g. sampling of…
B41F 13/0032
Common details of rotary presses or machines: auxiliary numbering devices
B41F 33/10
Tripping devices or stop-motions: for starting or stopping operation of damping or inking units

Abstract

Claims6