Cutting – With control means responsive to replaceable or selectable...
Patent
1987-06-19
1989-01-24
Yost, Frank T.
Cutting
With control means responsive to replaceable or selectable...
83 72, 83355, 83369, 83427, 83434, 83563, 83577, 83734, B26D 526
Patent
active
047994134
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cutting arrangement for the cutting to shape of a web-shaped material, such as paper webs in printing presses. The kind of cutting arrangements concerned are those which contain a cutting element and a backing element over which the paper web runs, in conjunction with which one edge of the cutting element is brought intermittently into contact with the paper web for the purpose of cutting through the paper web in its longitudinal sense.
BACKGROUND
Within the highly automated graphical industry for the production of periodicals and daily newspapers, printing, collating the pages of the newspaper, joining together the newspaper, for instance by glueing or stapling, and cutting the newspaper to its correct dimensions take place fully automatically through the use of various kinds of graphical machines. The finished newspapers are discharged from the production line at very high speed for packing into bales. If a separate supplement, a so-called tabloid such as an advertising supplement with dimensions which do not coincide with the dimensions of the newspaper, is to be inserted into the finished newspaper, this operation must be performed manually at a later stage, which increases the cost of production and is very time-consuming.
If, for example, the dimensions of the tabloid are one half of the dimensions of the newspaper, the procedure has already been disclosed of printing two parallel tabloids alternately with the newspaper on a long web of paper drawn from a roll, in conjunction with which a special cutting device separates the two tabloids from one another by cutting in the longitudinal sense of the web of paper. This cutting device usually consists of a rotating disc, the diameter of which is the same as the diameter of the cylinder against which the web of paper runs, said disc being held continuously in contact with the cylinder with the same direction of rotation relative to the cylinder. One half of the periphery of the disc is also provided with a sharp cutting edge, so that the disc cuts the paper for half of its rotation against the paper web and makes only light contact against the paper web for the other half of its rotation.
TECHNICAL PROBLEM
Cutting devices in the form of rotating discs take up space, are often very difficult to adjust, and provide unsatisfactory accuracy, especially at high web speeds. Previously disclosed cutting devices usually contain many moving parts, which call for extensive supervision and servicing.
THE SOLUTION
A cutting device is achieved through the invention which eliminates the disadvantages of previously disclosed technology and consists of a cutting element which is so arranged as to change position intermittently relative to the paper web between a first, advanced position in which the cutting element uses its edge to cut through the paper web as it passes over the backing element and a second, withdrawn position in relation to the paper web in which the cutting element is not in contact with the paper web. The intermittent movements of the arm between the first and the second position are controlled by a control unit depending on the advance of the paper web, in such a way that intermittent cut lines appear in the paper web in its longitudinal sense with a pre-determined starting and finishing point in relation to the paper web.
BRIEF DESCRIPTION OF DRAWINGS
The invention is described below in greater detail as an illustrative embodiment with reference to the accompanying drawings, in which
FIG. 1 shows a diagrammatic perspective view of part of a printing press equipped with the cutting arrangement in accordance with the invention,
FIG. 2 shows a diagrammatic side view of the printing press with the cutting device, and
FIG. 3 shows part of the printing press viewed directly from the front, but with the cutting device omitted.
BEST MODE OF CARRYING OUT THE INVENTION
As will be appreciated from the example illustrated in FIGS. 1, 2 and 3, the printing press consists of a rotating printing cy
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Jones Eugenia A.
Roy Soderqvist Mekaniska Verkstad AB
Yost Frank T.
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