Printing – Rolling contact machines – Rotary
Patent
1999-04-06
2000-06-27
Hilten, John S.
Printing
Rolling contact machines
Rotary
101216, 226 11, B65H 4300, B41F 1354
Patent
active
060793287
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arresting or stopping device for a print carrier, such as a paper web.
DESCRIPTION OF THE PRIOR ART
A paper web separation and arresting device for the prevention of damage to print units or folding devices in case of paper web tears, is known from DE 39 29 2271 A1. This prior art device consists of a stationary, strip-shaped clamping elemen,t and of a strip-shaped clamping element which is arranged axis-parallel with the stationary element which and can be displaced in the direction toward the stationary clamping element. The running paper web is guided through the clamping elements, which are spaced apart from each other, during the production phase of the print unit. In case of a malfunction of the paper transport, a control command is triggered by a corresponding control device and actuates cylinder-piston units. These cylinder-piston units move the displaceable strip-shaped clamping element in the direction toward the stationary clamping element. In the process, the running paper web is stopped, so that coiling of the paper web, which could damage the press, is prevented.
SUMMARY OF THE INVENTION
The object of the invention is based on providing a switchable arresting device for a print carrier of printing presses.
In accordance with the present invention, this object is attained by providing a rubber-elastic hose and a counter-clamping device which are secured to the frame of a printing press. The rubber-elastic hose can be inflated to increase its cross-section thereby bringing it into clamping engagement with the counter-clamping device.
The advantages which can be achieved by the invention consist, in particular, in that a device for arresting a print carrier, made of paper or plastic, of paper or foil webs or sheets, has been created, which operates without sharp-edged or mechanically moved elements. The inflatable hose, which in case of a malfunction moves in the direction toward the paper web, and the cooperating stationary clamping strip, assure a rapid and dependable holding or clamping of the paper web, so that damage to the printing or folding units because of coiling or plugging is prevented. Particularly short actuating times are achieved with the device of the present invention because of the low mass inertia of the inflatable hose. The actuating time of the inflatable hose can be further reduced by preliminarily pre-inflating the hose with a defined partial inflation air pressure.
Finally, because of the few structural components and the absence of mechanical elements, such as work cylinders or the like, only little space is required when installing the device, for example in front of a print unit.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is represented in the drawing and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a schematic representation of a cross section through an arresting device in a first, low operating position, as well as in an intermediate operating position; and in
FIG. 2, a schematic representation of a cross section through an arresting device in a second, higher operating position, as well as an associated switching diagram.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An arresting device 1 for a print carrier web, for example a paper web 2, of a print carrier web moving through a rotary printing press, as seen in FIGS. 1 and 2, is located, for example, in front of the inlet of each print unit, or respectively in front of, or before the inlet of a folding device. The arresting device 1 consists of a stationary counter clamping device or clamping strip 3, for example in the form of a transverse bar, extending crosswise in respect to the running direction A of the paper web 2 between the two side frames, and positioned on a first side of the paper web 2. On the other or second side of the paper web 2, an identical transverse bar 4 is fastened between the side frames, and extends axis-parallel with this stationary clamping strip 3 and i
REFERENCES:
patent: 5036765 (1991-08-01), Keilhau
patent: 5239903 (1993-08-01), Rosas et al.
patent: 5619923 (1997-04-01), Kotterer
patent: 5931092 (1999-08-01), Werner et al.
Colilla Daniel J.
Hilten John S.
Koenig & Bauer Aktiengesellschaft
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