Printing – Rolling contact machines – Rotary
Reexamination Certificate
2002-02-19
2004-06-22
Lefkowitz, Edward (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S232000, C101S227000, C101S219000, C101S224000, C101S225000, C101S226000, C101S228000, C493S400000, C493S405000, C493S357000
Reexamination Certificate
active
06752078
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for guiding flat or sheet-like copies in folders, in particular such folded copies as are severed from a continuous material web.
In folders arranged downline in web-processing rotary printing machines, stationarily accommodated copy guides are arranged downline from a cutting nip of a cutting-cylinder pair. Such stationary copy guides are usually configured so that they correspond, with respect to the width thereof, to the width of the maximum processable web format and are configured, with respect to the extent of the guide nip thereof, so that the distance between the lateral surfaces bounding the guide nip corresponds to the thickness of a maximum processable material-web strand. With stationary copy guides arranged downline from a cutting nip of a cutting-cylinder pair, it is possible to guide a leading end of a material web through an outlet wedge of the cutting-cylinder pair into an inlet region with mutually cooperating transport belts, so that the copies severed from the material web in the cutting nip do not remain beyond control as they pass out of the outlet wedge of the cutting-cylinder pair into the inlet wedge of the downline transport-belt pair.
Stationary copy guides which are arranged downline from a cutting-cylinder pair encounter limitations with respect to the copy-guide quality that can be achieved therewith in the case of narrow web widths. In particular, when the width of the material web which is to be processed exceeds the width of stationary copy guides, stationary copy guides in the outlet wedge of a cutting-cylinder pair do not constitute a satisfactory solution. Furthermore, stationary copy guides do not allow individual adaptation of the guide surfaces to the thickness of the material-web strand; in addition, stationary copy guides cannot be removed readily from the installation region thereof downline from the cutting-cylinder pair. The hereinaforementioned stationary copy guides are described, for example, in the French Patent 2 751 630 or in U.S. Pat. No. 5,839,365.
Another possible construction, heretofore known from the published European Patent Document EP 0 400 596 A1, for improving copy guidance between a cutting nip of a cutting-cylinder pair and downline transport belts calls for providing between the transport-belt lines, on both sides of the incoming web, blowing or blast nozzles which are directed into the gap between the web and the cutting cylinder, and in arranging, on the circumferential surface of one of the cutting cylinders of the cutting-cylinder pair, annular grooves for a through-passage of the blowing or blast air. The blowing or blast air passing out of the blowing or blast nozzles is removed again to the greatest extent by suction nozzles assigned to the inlet region of the transport belts.
SUMMARY OF THE INVENTION
In view of the outlined developments heretofore known from the prior art, the object of the invention is to provide a copy guide for sheet-like copies that is adapted automatically to the respective material-web format which is to be processed and to the thickness of the material web, and can be set back from the outlet wedge of the cutting-cylinder pair.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a device for guiding sheet-like copies which are severed from a material web in a cutting nip of a cutting-cylinder pair, comprising a copy guide disposed in an outlet wedge of the cutting-cylinder pair for gripping leading ends of the sheet-like copies for guiding the copies, the copy guide including revolving transport elements, and actuating drives for displacing the revolving transport elements in a lateral direction so as to adapt the transport elements to different positions and widths of material webs.
In accordance with another feature of the invention, a respective copy guide is assigned to each side region of the material web.
In accordance with a further feature of the invention, a plurality of the copy guides arranged on both sides of the material web which is to be processed are displaceable symmetrically in relation to a machine center.
In accordance with an added feature of the invention, the copy guides arranged on both sides of the material web which is to be processed are displaceable independently of one another in relation to the machine center.
In accordance with an additional feature of the invention, to the copy guide there is assigned an actuating drive for positioning the copy guide within a displacement distance in a region of a side edge of the material web in accordance with the width of a copy.
In accordance with yet another feature of the invention, the copy guide includes pairwise driven rotary bodies and driving rotary bodies, about which the transport elements are revolvable.
In accordance with yet a further feature of the invention, the guiding device includes drives integrated in the copy guides for driving the driving rotary bodies.
In accordance with yet an added feature of the invention, each copy guide comprises an actuating cylinder for displacing a mount including rotary bodies into a position wherein the material web is gripped thereby, and into a position wherein the material web is not gripped thereby.
In accordance with yet an additional feature of the invention, pairs of the rotary bodies, respectively, are formed with a gap having a variable opening between the rotary bodies thereof.
In accordance with still another feature of the invention, the gap is bounded by the driven transport elements.
In accordance with still a further feature of the invention, the guiding device includes pivotable carriers wherein the driven rotary bodies are accommodated, relative to the rotary bodies, respectively, which drive them.
In accordance with still an added feature of the invention, the pivotable carriers are pivotable relative to the driving rotary bodies in order to vary the extent of opening of the gap.
In accordance with still an additional feature of the invention, the transport elements are configured as axially spaced-apart transport belts.
In accordance with another feature of the invention, the material web leaving the cutting nip is guidable by the transport elements on both sides of the material web, without any relative speed, along a gripping region.
In accordance with a further feature of the invention, the driven transport elements are arranged on mutually opposite sides of the material web as well as on both sides of the material web.
In accordance with a concomitant feature of the invention, there is provided a folder having a guiding device for guiding a material web in a cutting nip of a cutting-cylinder pair, wherein sheet-like copies are severed from the material web, the cutting-cylinder pair comprising a copy guide disposed in an outlet wedge of the cutting-cylinder pair for gripping leading ends of sheet-like copies severed from the web for guiding the copies, the copy guide including revolving transport elements, and actuating drives for displacing the revolving transport elements in a lateral direction so as to adapt the transport elements to different positions and widths of material webs.
The advantages of the embodiments according to the invention can be seen, in particular, in that the copies passing through the outlet wedge of the cutting-cylinder pair are now guided on both sides along a gripping region by conveying surfaces which are moved along as well, with the result that the situation wherein individual layers of a multilayered sheet-like copy flap open or become detached is effectively prevented as the copies pass through the outlet wedge of the cutting-cylinder pair, which is located downline from the cutting nip. Due to the driven transporting elements of the copy-guiding arrangement, the transporting elements being formed, for example, in belt form, the sheet-like copies can be guided through the outlet wedge into an inlet region of transport belts without any occurrence of disruptive relat
Blanchard Alain
Chagnon Franck
Robin Philippe
Evans Andrea H.
Heidelberger Druckmaschinen AG
Lefkowitz Edward
Mayback Gregory L.
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