Sheet-material associating – With printing – Associating and folding – with rotary printer
Reexamination Certificate
2000-08-07
2002-04-09
Eickholt, Eugene (Department: 2854)
Sheet-material associating
With printing
Associating and folding, with rotary printer
C270S006000, C270S008000, C270S042000, C493S424000
Reexamination Certificate
active
06367792
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to a copy-guiding cylinder of a folder, which is operatable in different folding modes, and is disposed downline of a rotary printing machine.
The published German Patent Document DE 44 26 987 C2, which is exemplary of the prior art, discloses a folder with format changeover. The folder is equipped with at least two folding cylinders which are located downline of a cutting cylinder and of which at least one has at least two cylinder bodies which are mounted on a shaft, are positioned inside one another and, during standstill or operation, are adjustable relative to one another by a planetary-gear transmission. The first cylinder body cooperates with a cutting cylinder, while the second cylinder body cooperates with the at least one cylinder body of the second folding cylinder, it being possible for the second cylinder body to be adjusted together with the at least one cylinder body of the second folding cylinder.
The first cylinder body and the second cylinder body of the first folding cylinder are connected to one another via a first planetary-gear transmission and a second planetary-gear transmission, one shaft being common to both transmissions. The planetary gears of the first planetary-gear transmission are arranged rotatably on a driven gearwheel which drives the first cylinder body. The planetary gears drive a sun gear which is common to the two planetary-gear transmissions. The sun gear drives the second cylinder body via planetary gears of the second planetary-gear transmission, the two planetary-gear transmissions, in conjunction with one another, having a transmission ratio of 1:1.
The foregoing proposed construction involves a great mechanical outlay.
The French Patent 2 697 205 is concerned with a folder for processing continuous printed material webs. The folder described therein is equipped with a cutting device cooperating with a transfer cylinder that is driven about the axis thereof. The transfer cylinder, which is equipped with an interrupted circumferential surface, cooperates with a folding jaw cylinder having folding jaws on the circumference thereof, and sets of pins and folding blades are provided, which serve for transversely inserting copies severed from the material web into the folding jaws. Also provided on the transfer cylinder are devices by which relative displacement between pins and folding blades can take place. Closure plates are accommodated on the circumference of the transfer cylinder on both sides of the folding blades and, likewise, on both sides of the sets of pins. The two closure plates can be moved relative to one another in the manner of a coulisse or sliding block, the plates forming a virtually continuous outer lateral surface of the cylinder, regardless of the respective angular position of the folding blades and the sets of pins relative to one another on the circumference.
A disadvantage with this construction was that the curvature of the closure plates was difficult to produce and the coulisse-type guidance of the closing plates within one another inevitably resulted in a stepped lateral surface of the cylinder, although the step was relatively small. This results in different circumferential speeds for the copies on the circumference of a cylinder formed in this manner.
SUMMARY OF THE INVENTION
As a further development of the foregoing constructions of the prior art, the invention of the instant application has, as objects thereof, maintaining the cylindricity of a product-guiding folding cylinder that is adjustable in accordance with the then operating folding mode, and achieving a constant circumferential speed of the copies guided on the circumference of the cylinder.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, in a rotary printing machine, a folder operatable in different folding modes, and having a copy-guiding cylinder to which copies severed from a material web by a cutting-cylinder pair are feedable, the copy-guiding cylinder having a circumferential surface wherein gripping and cross-folding elements are accommodated, comprising a device including movable circumferential-surface parts guidable by a respective guide element and, during folding-mode changeovers, selectively extendable into the circumferential surface of the cylinder and retractable between stationary and movable segments of the copy-guiding cylinder which are positionable relative to one another.
In accordance with another feature of the invention, the circumferential-surface parts are pivotable about a pin carried by one of the segments of the cylinder.
In accordance with a further feature of the invention, the pin is carried by a stationary segment of the cylinder.
In accordance with an added feature of the invention, the respective guide element of the circumferential-surface parts is connected to one of the segments of the cylinder.
In accordance with an additional feature of the invention, the respective guide element is accommodated on a movable segment of the cylinder.
In accordance with yet another feature of the invention, the device includes a prestressing unit for subjecting the circumferential-surface parts to torsion, at respective mounting locations thereof.
In accordance with yet a further feature of the invention, the circumferential-surface parts are provided with a follower element guidable in the guide element.
In accordance with yet an added feature of the invention, the follower element is formed as a roller.
In accordance with yet an additional feature of the invention, the guide element has a cage bounded by two runner surfaces.
In accordance with still another feature of the invention, the runner surfaces merge into an upper and a lower cutout formed in the guide element.
In accordance with still a further feature of the invention, the device includes a toggle-lever system for supporting the movable circumferential-surface parts.
In accordance with still an added feature of the invention, the toggle-lever system includes a lever rotatably mounted on the stationary segment.
In accordance with still an additional feature of the invention, the device includes a stop formed between upper and lower levers of the toggle-lever system in vicinity of a toggle joint thereof.
In accordance with another feature of the invention, the device includes a prestressing element actable upon the toggle-lever system.
In accordance with a further feature of the invention, the segments of the cylinder have a spacing formed therebetween for allowing overfold corrections.
In accordance with an added feature of the invention, the folder in the rotary printing machine is pinless.
In accordance with a concomitant aspect of the invention, there is provided a copy-guiding cylinder for a folder of a rotary printing machine, the folder being operatable in different folding modes, the cylinder having copies severed from a material web by a cutting-cylinder pair feedable thereto, and having a circumferential surface wherein gripping and cross-folding elements are accommodated, comprising movable circumferential-surface parts guidable by a respective guide element and, during folding-mode changeovers, selectively extendable into the circumferential surface of the cylinder and retractable between stationary and movable segments of the cylinder which are positionable relative to one another.
The solution for the problems found in the prior art, which are realized in the invention of the instant application is accompanied by a large number of advantages. On the one hand, retraction and extension of the circumferential-surface parts take place automatically during folding-mode changeovers due to the positive guidance of the circumferential-surface parts. On the other hand, a precisely achievable cylindricity of the circumferential surface of the copy-guiding cylinder is assured by mounting the circumferential-surface parts on one of the segments of the copy-guiding cylinder. The circumferential-surface parts, which are retra
Eickholt Eugene
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Stemer Werner H.
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