Sheet-material associating – Associating or disassociating – Web associating
Reexamination Certificate
2001-09-04
2003-09-09
Mackey, Patrick (Department: 3651)
Sheet-material associating
Associating or disassociating
Web associating
C370S902000, C370S902000, C083S343000, C083S346000, C493S357000, C493S370000
Reexamination Certificate
active
06616134
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for electrically insulating rotating components in rotary printing machines or to aggregates, such as folders, located downline from the components, the folders being usually preceded by web-processing rotary printing machines.
The published International Patent Document WO 98/47802 is concerned with a device for electrostatically charging a multilayer strand, more particularly, a paper web that is printed in a web-processing rotary printing machine. A device for electrostatically charging a multilayer strand after the individual strand layers have been brought together by oppositely polarized charging electrodes is proposed in this International patent document. The charging electrodes are arranged at both of the outerlying sides of the strand and are formed so that they contact the strand at the outer sides thereof. According to this International patent document, the charging electrodes contacting the outer sides of the web strand are preferably formed as strand-contacting rollers and are so set against the strand as to be installed directly opposite one another and mutually pressing the strand therebetween. According to this construction heretofore known from the prior art, it is also possible to form the charging electrodes as electrically conductive brushes contacting the strand.
The published European Patent Document 0 451 573 A1 relates to a deviation or deflection device in a folder, where individual printed printing copies are separated from a multilayer material web strand. A device for dividing a printing copy stream into a number of partial streams is disclosed in the folder of a rotary printing machine proposed therein. For electrostatically charging the individual printing copies, electrostatically chargeable elements are arranged in a distributed manner in circumferential direction on two adjacent deviation or deflection cylinders. A device for guiding the printing copies to the deviation or deflection cylinders is provided below the two cooperating deviation or deflection cylinders, as well as a device for removing the printing copies from the circumferential surfaces of the respective deviation or deflection cylinders for further transporting the individual printing copies to a delivery. According to the improvement heretofore known from the European Patent 0 451 573 1, the individual electrostatically chargeable elements at the circumferential or outer cylindrical surfaces of the deviation or deflection cylinders are offset 90° from one another, so that the circumferential surfaces of the two deviation or deflection cylinders cooperating with one another, respectively, have four electrostatically chargeable elements. Polarization of the electrostatic elements is reversed during the transport of the printing copies so that the printing copies running into the nip between the deviation or deflection cylinders alternately are picked up by the one surface of one of the deviation or deflection cylinders and are pushed off by the circumferential surface of the other deviation or deflection cylinder. This results in an alternating charging of the electrostatically charged printing copies, which are separated from the material web, at conveyor belts located downline, as viewed in the travel direction of the material web, from the deviation or deflection cylinders, or gripper cylinders for accepting the printing copies at the leading edges thereof, further transport devices for the printing copies being providable downline from the gripper cylinders.
It has been found that multilayer material webs adhering to one another by static charging, lose the previously applied electrostatic charge thereof when they come in contact with the surface areas or the cutting tools of the cylinders of a cutting cylinder pair in the folder. The adhesion of the individual web strands of the multilayer material webs to one another therefore decreases. The result thereof is that relative movements between the individual web layers arise in the inlet wedge and in the outlet wedge of the corresponding cutting cylinder pair of a material web-processing folder. Relative movements of the individual material web layers, whether a relative shifting or a fluttering of the leading end of the material web or of the separated products, have an undesirable or negative effect upon the cutting precision and therefore are to be avoided. With regard to the printing copies that are separated from the leading end of the multilayer material web, the decreasing adhesive effect has the result that the respectively open pages of the products can flutter due to the resultant whipping effect, which can cause the edges to turn over.
SUMMARY OF THE INVENTION
In view of the foregoing constructions heretofore known from the prior art, it is accordingly an object of the invention to provide a device for electrically insulating rotating components in a rotary printing machine, which optimally prevents relative movements between individual material web layers of a multilayer material web, as well as consequences of the whipping effect produced when the printing copies are separated.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a device for electrostatically charging a multilayer material web, comprising electrostatic charge elements assigned to outer sides of the multilayer material web, the charge elements being disposed upline of an inlet of the multilayer material web into a cylinder group of a folder, as viewed in a travel direction of the multilayer material web, the cylinder group including cylinders formed with respective outer cylindrical surfaces, the cylinders including a cutting cylinder pair having a cutting nip into which a leading end of the multilayer material web extends, the cutting cylinder pair being provided with an electrically insulated cutting tool.
In accordance with another feature of the invention, the outer cylindrical surfaces of the cylinders of the cutting cylinder pair are provided with an electrically insulating jacket coating.
In accordance with a further feature of the invention, circumferential surface segments accomodated in respective cylinder cores of the cylinders of the cutting cylinder pair are provided with electrically insulating jacket coating sections.
In accordance with an added feature of the invention, the cutting tool is formed as an anodized cutting knife.
In accordance with an additional feature of the invention, the cutting tool is accomodated in an electrically insulated manner in a knife cylinder of the cutting cylinder pair.
In accordance with yet another feature of the invention, the charging device of the invention includes a tool holder having clamping elements for holding the cutting tool in the knife cylinder, the clamping elements being received in an insulating casing.
In accordance with yet a further feature of the invention, the charging device of the invention includes at least one electrically insulated fastener for attaching the cutting tool holder to the knife cylinder.
In accordance with yet an added feature of the invention, the fastener is surrounded by a collar-shaped insulating element formed of electrically insulating material.
In accordance with yet an additional feature of the invention, the electrically insulating element is formed of a material selected from the group consisting of a ceramic material and a PTFE or polytetrafluoroethylene component.
In accordance with still another feature of the invention, the charging device includes a charge eliminator tongue settable against the knife cylinder of the cutting cylinder pair, the charge eliminator tongue being assigned, during a stop, to the electrically insulated knife cylinder of the cutting cylinder pair.
In accordance with a concomitant aspect of the invention, there is provided a folder for processing multilayer material webs after individual layers of the multilayer material web have been brought together, including a device for elect
Maresse Alain
Melon Thierra
Heidelberger Druckmaschinen AG
Locher Ralph E.
Mackey Patrick
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