Securing device for a printed carrier

A securing device for a printed carrier in a printing press is actuated in case of the tearing of the printed carrier. The paper web or printed carrier can be clamped between an inflatable hose and a stationary counter clamping device. The hose has a non-operating position which is out of the path of web travel, and can be rapidly inflated to its operating position if a paper web break is sensed. An intermediate, partially inflated position can also be attained by the hose.

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.

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 is mirror-reversed 
with respect to it, for example at a distance g, h, for example g=h=16 mm. 
The paper web 2 runs between the stationary clamping strip 3 and the 
transverse bar 4. 
On its side facing the paper web 2, this transverse bar 4 has a clamping 
body, for example a rubber-elastic hose 6, which can be charged with a 
pressure medium. On its underside, or respectively its side facing the 
transverse bar 4, this hose 6 has a bottom or attachment strip 7, 
extending over the entire length of the hose 6 and fixed on it. A width b 
of the hose attachment strip 7 is greater than an exterior diameter of the 
hose 6. In this way, ends or flanges 8, 9 project out on both sides of the 
hose cross section, which flanges 8 and 9 are fastened to the transverse 
bar 4 by means of clamping rails 11, 12. The clamping rails 11, 12 can be 
fastened to the transverse bar 4 by means of screws 13, for example. A 
hose work surface 14 is formed on the side of the inflatable hose 6 
opposite the bottom attachment strip 7, i.e. in the center of the 
unencumbered circumference of the hose 6. Hose work surface 14 and is 
provided with a friction-enhancing or slip-proof material. It can also 
consist of a profiled clamping strip 17 with a corrugated clamping face 
20, as shown in dashed lines in FIG. 1 which is fixed on the hose and 
extends on the exterior circumference of hose b in the axis-parallel 
direction of the hose 6. 
The hose 6 preferably consists of rubber with a textile insert, for 
example, and of the bottom attachment strip 7 which is made of rubber. 
Because of the arrangement of the textile insert, in a first, low 
inflation pressure, non operating position K, the hose 6 is in a state 
where its cross section is collapsed, and has a low height h, as is 
depicted in FIG. 1. In the non operating position K the hose 6 has a 
profile which corresponds to two letters U arranged inside each other. 
The hose 6 is of a length which at least corresponds to the width of the 
paper web 2. A connector 18 for connecting a pipe line 19 for the pressure 
medium, which may be for example compressed air, is located on one of the 
two ends of the hose 6. The pressure medium can also be oil or a gel. 
A web tear control device 21 for the paper web 2 is arranged in the running 
direction A of the paper web 2 and downstream of a print unit, or a 
folding device, both of which a not represented, and which detects an 
interference with the web transport, for example a web tear in the print 
units, or a missing specimen in the folding unit, all as seen in FIG. 2. 
The web tear control device 21 can be made up of, for example, tracers, 
photodiodes, sensors or the like. A signal emitted by the web tear control 
device 21, in case of a malfunction, is provided via an amplifier 22 to a 
magnet valve 23. The magnet valve 23 then makes a connection between the 
hose 6 and a central compressed air supply 24 provided at a pressure of 
six bar, for example. By means of this, the hose 6 is inflated in the 
shortest possible time, for example in a few milliseconds, so that its 
cross section is increased, because of being charged with the pressure 
medium, to a second, larger cross-section operating position L, i.e. the 
hose 6 is inflated. 
The hose 6 has now been extended, upon inflation, in its radial direction, 
i.e. in the direction of the hose diameter d, by the amount g+h, so that 
the profiled clamping strip 17 of the hose 6 is pressed against the paper 
web 2 running between the clamping strip 3 and the hose 6 fastened on the 
transverse bar 4. This clamping action which results in the severing of 
the paper web 2. In this inflated operational condition the hose 6 has a 
cross-section which is a multiple of the cross section found in the former 
non-operational position of rest, so that an operating position L, which 
is distant from the first non operating position K, is created. A known 
catching roller, which is located in the production direction, for example 
respectively downstream of the print unit, then rolls up the severed paper 
web. At the termination of the compressed air charge, the hose 6 is 
returned into its position of rest because of its inherent restoring 
force. 
In another embodiment, the restoration can also take place by means of 
suction air instead of an impressed restoring force. 
It is also possible to fasten the attachment or bottom strip 7 of the hose 
6 to the transverse bar 4 in another way, for example by gluing. 
Damage to the print unit, for example by coiled paper web, is prevented by 
the present invention. 
It is furthermore possible to provide one or several connectors 18 for the 
pipe line 19 on both ends of the hose 6 or on the side of the hose 6. 
It is also advantageous to coat the stationary clamping strip 3, on its 
side facing the paper web 2, with a slip-resistant material, for example 
rubber. The material must have a high coefficient of friction in relation 
to paper or foil. 
Finally, it is also possible to provide the stationary clamping strip 3, on 
its side facing the paper web 2, also with a hose 6 which, in its 
operating position parallel with the hose 6 on the transverse strip 4, can 
also be filled with air. 
It is also possible for the hose 6 to have the cross section of a shallow 
oval in its low or non operating position K. 
A further preferred embodiment variant consists in prestressing the hose 6 
in its first, low non operating position K by means of compressed air of, 
for example 0.2 to 0.5 bar, so that in case of a failure of the paper web 
2 the second, higher operating stage of hose 6 is attained even faster. To 
this end, a second pressure-adjustable check valve, not represented, is 
connected parallel with the magnet valve 23 which is shown in FIG. 2. 
Prestressing of the hose 6 in the non operating position K can be just 
strong enough so that its elastic shape in the state of rest is not 
changed so that it stays in the shape shown in FIG. 1. 
It is also possible to preset the hose 6 by means of charging it with a 
pressure medium into an intermediate, pressure medium-prestressed 
operating position M depicted in FIG. 1 which is located between the first 
non operating position K and the second operating position L at any 
arbitrary height h+g/x. In this case, x is a natural number, for example 
between one and ten. While a preferred embodiment of a securing device for 
a printed carrier in accordance with the present invention has been set 
forth fully and completely hereinabove, it will be apparent to one of 
skill in the art that a number of changes in, for example the type of 
printing press or folding device being used, the width of the printed 
carrier and the like may be made without departing from the true spirit 
and scope of the present invention which is accordingly to be limited only 
by the following claims.