Manufacturing container or tube from paper; or other manufacturi – Bending – Deflecting
Reexamination Certificate
2001-08-15
2004-01-06
Rada, Rinaldi I. (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Deflecting
C493S461000, C493S436000, C493S441000, C493S475000, C083S155000
Reexamination Certificate
active
06673005
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for guiding signatures, particularly in the region of a wedge-shaped outlet of a cutting-cylinder device in a folder of a rotary printing machine.
Folders of rotary printing machines, particularly of web-fed rotary offset printing machines, are beset by a problem that, after a longitudinal folding operation on a continuous paper web, signatures severed therefrom by revolving cutting blades do not undergo any defined guidance during and after the cutting operation. This may result in disruptions during the subsequent transportation of the signatures, if the latter enter, for example, onto endless transporting belts arranged downline in the cutting-cylinder arrangement, above and below the transporting path of the signatures, in order for the latter to be fed to a further-processing device, in particular a folder.
One of the most common causes of disruption occurring as the signatures enter onto the downline transporting belts is that the leading corners of the signatures fold over and form so-called “dog ears” as the signatures enter onto the transporting belts. This results not only in the printed products being unusable as such, and having to be separated out in corresponding downline devices, for example, in reject or waste paper diverters, but rather also, there arises a risk that the damaged signatures, during subsequent folding operations, result in a paper build-up which may frequently be associated with production failures or even damage to the folder.
It has become known heretofore from U.S. Pat. No. 4,385,537, to provide, in the region of the wedge-shaped outlet of a cutting-cylinder arrangement, an upper and a lower transporting belt which are guided, respectively, over a deflecting roller which is displaceable within the wedge-shaped outlet. This U.S. patent offers no indication or suggestion of providing, in the region of the wedge-shaped outlet of the cutting-cylinder arrangement, any further guide devices which avoid the situation wherein the leading corners of the signatures fold or crease over as the signatures enter onto the transporting belt.
The published German Non-prosecuted Patent Application (DE-OS) 27 43 801 A1 describes a rotary cross cutter in which there is provided in the region of the wedge-shaped outlet, between the two cutting cylinders, a table which extends over the entire width of the cutting cylinders and is accommodated on a resiliently elastic mounting support which is displaceable in the transporting direction of the signatures. The resiliently elastic mounting support is provided so as to ensure that a signature build-up in the region of the wedge-shaped outlet does not result in damage to the table or to the transporting belts arranged downline from the table, above and below the transporting path of the signatures. Despite the high-outlay resiliently elastic mounting support of the table, the leading ends of the signatures are not prevented by the table from folding over as the signatures enter into the downline transporting belts.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention of the instant application to provide a device for guiding signatures in the region of a web-shaped outlet of a cutting-cylinder device in a folder of a rotary printing machine, which is of straightforward and cost-effective construction, in case of a paper buildup, is not prone to damage, or in the case of damage can be replaced cost-effectively, and allows the signatures to be guided reliably in a downline transporting device.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for guiding signatures, in a folder of a rotary printing machine, comprising at least one guide belt disposed near a transporting path of the signatures, and extending transversely to a transporting direction of the signatures, the at least one guide belt being formed with guide surfaces defining the transporting path.
In accordance with another feature of the invention, the signature-guiding device is in combination with a cutting-cylinder device having a wedge-shaped outlet within a region of which, the signature-guiding device is disposed.
In accordance with a further feature of the invention, the at least one guide belt is an endless guide belt extending over two first and second deflecting rollers arranged on mutually opposite sides of the signature-guiding device, so that the guide surfaces are formed by respective mutually opposite inner sides of the endless guide belt, between which the signatures run through the signature-guiding device.
In accordance with an added feature of the invention, the signature-guiding device includes at least another guide belt, the one and the other guide belts being arranged on mutually opposite sides of the transporting path of the signatures so that respective outer sides of the one and the other guide belts form the guide surfaces.
In accordance with an additional feature of the invention, the guide surfaces face towards the signatures, and are disposed at an angle to the transporting path of the signatures, so as to produce a funnel-like inlet region into which the signatures enter by leading edges thereof.
In accordance with yet another feature of the invention, the angle between at least one of the one and the other guide belt, on the one hand, and the transporting path of the signatures, on the other hand, is variable.
In accordance with yet a further feature of the invention, the at least one guide belt is disposed in a region between a cutting-cylinder pair and a transporting-belt device located downline therefrom, as viewed in the transporting direction of the signatures, in a folder of a web-fed rotary printing machine.
In accordance with yet an added feature of the invention, the signature-guiding device includes at least another guide belt, each of the guide belts having a tensioning device assigned thereto.
In accordance with yet an additional feature of the invention, the tensioning device includes a lever arm, an actuating device for pivoting the lever arm about a pivot pin, and a deflecting roller whereover a respective guide belt extends, the deflecting roller being rotatably secured on the lever arm.
In accordance with still another feature of the invention, the actuating device includes a spring for acting on the lever arm, and a cam assigned to the lever arm, the spring and the cam cooperating with one another so that, by rotation of the cam, the lever arm is movable from a first and tensioning position into a second position, wherein the respective guide belt is not tensioned.
In accordance with still a further feature of the invention, the actuating device for acting on the lever arm is at least one of a pneumatic cylinder and an electrical actuator, respectively, by which the lever arm is pivotable from a first and tensioning position into a second position, wherein the guide belt is not tensioned.
In accordance with still an added feature of the invention, the distance between the guide belts, on the one hand, and the transporting path of the signatures, on the other hand, is variable.
In accordance with still an additional feature of the invention, the guide belts extend over deflecting rollers which have a characteristic selected from the group of characteristics consisting of being eccentrically mounted and non-round, respectively, the distance between the guide belts, on the one hand, and the transporting path of the signatures, on the other hand, being variable due to rotation of the deflecting rollers.
In accordance with a concomitant feature of the invention, the guide surfaces face towards the signatures and are provided with a friction-reducing coating.
According to the invention, the device for guiding signatures in the region of a wedgeshaped outlet of a cutting-cylinder device in a folder of a rotary printing machine is distinguished in that, arranged in the vicinity of the transporting path of the signatures, are one or more flat guide belts which e
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Locher Ralph E.
López Michelle
Rada Rinaldi I.
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