Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – And with bending
Reexamination Certificate
2000-10-17
2001-06-26
Gerrity, Stephen F. (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
And with bending
C493S360000, C493S424000, C493S429000, C493S476000
Reexamination Certificate
active
06251053
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method for transferring an end of a material web.
A folder for a printing press has been disclosed in the prior art, as exemplified by the published German Patent Document DE 44 46 753 A1. The folder is made up of a first folding cylinder provided with controllable grippers, and a second folding cylinder likewise provided with controllable grippers. The second folding cylinder is provided with additional controllable grippers, besides the controllable grippers already present on the circumference thereof, in order to press the trailing end of signatures against the circumference of the folding cylinder. The additional controllable grippers, respectively, are formed of a spring-steel blade which is held by a bearing connected to a transversely disposed tube. The additional controllable grippers, respectively, cooperate with a holder carrying a bar formed of elastic material.
The published German Patent Document DE 43 42 037 C1 discloses a method and a device for cross-folding signatures. In a folder which is arranged downline of a rotary printing press and has a collecting cylinder, the signatures are cross-folded in half in the initial region of a first and leading half, respectively, of signatures, the respective first and leading half being retained by holding devices. This occurs by having a folding blade penetrate into folding jaws of a jaw cylinder, copies which have been folded in half being retained in the folding jaws. Then, in a region of the point of intersection of an imaginary plane connecting the axes of rotation of the cylinders and a tangent to the circumference of the collecting cylinder, a respectively second and trailing half of the signatures is gripped, and secured, in an end region thereof by a controllable securing device. Thereafter, respectively, the initial region of the first and leading half of the signatures is released by the retaining devices of the collecting cylinder at the latest when the latter is at zero speed, or near zero speed, until the beginning and the end of the signatures retained in the folding jaws, respectively, are located more or less above one another. Finally, the securing device of the jaw cylinder again releases the trailing and second half, respectively, of each copy.
The problem of a so-called whiplash effect arises in cross-folding operations. The high accelerations which occur during transfers of copies from one cylinder to the other result in uncontrolled spreading and fanning out, respectively, of the end of the second, i.e., trailing, half of a signature; a folding-over or dog-earing of corners is also possible. In the solution to this problem set forth in the aforementioned published German Patent Document DE 43 42 037 C1, only part of the problem is solved, because the other end of the signature remains free. In previous attempts to find a solution, the problem has also occurred that an outwardly extending movement of the copy-gripping grippers into the nip between copy-guiding cylinders has always resulted, during a relatively longer period of rotation of the cylinders in the circumferential direction, in an increase in size of the enveloping curve around the relevant cylinder.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a method for transferring an end of a material web.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a folder for a rotary printing press, having at least one copy-guiding cylinder and, on the one copy-guiding cylinder, gripping devices for gripping one end of a copy, comprising a cutting cylinder cooperating with the one copy-guiding cylinder, and copy-guiding devices provided on the cutting cylinder, the gripping devices of the one copy-guiding cylinder and the copy-guiding devices of the cutting cylinder being retractably and extensibly movable substantially parallel to normals to axes of rotation of the one copy-guiding cylinder and the cutting cylinder.
In accordance with another feature of the invention, the folder includes displaceable supports whereon holding devices and copy-guiding devices are arranged.
In accordance with a further feature of the invention, the folder includes sliding guides whereon the supports are displaceable.
In accordance with an added feature of the invention, the copy-guiding devices are guidable, in the manner of a coulisse or connecting link, substantially parallel to a normal to the axis of rotation of the cutting cylinder.
In accordance with an additional feature of the invention, the folder includes a rotatable adjusting shaft, and the support for the copy-guiding devices is actuatable via a lever connection by rotation of the adjusting shaft.
In accordance with yet another feature of the invention, the folder includes a control roller for actuating the adjusting shaft.
In accordance with yet a further feature of the invention, the folder includes an energy storage device by which the adjusting shaft is actuatable.
In accordance with yet an added feature of the invention, the copy-guiding devices are mutually spaced apart beside one another on the respective supports.
In accordance with yet an additional feature of the invention, the folder includes a cutting-blade mount provided on the cutting cylinder, and the copy-guiding devices, in a retracted condition thereof, penetrate into recesses formed in the cutting-blade mount.
In accordance with still another feature of the invention, the supports are formed with openings having fastening elements extending therethrough.
In accordance with still a further feature of the invention, the folder includes a control roller cooperating with a control cam, the supports being connected by connecting webs to the control roller.
In accordance with still an added feature of the invention, the control cam is an open control cam.
In accordance with an alternative feature of the invention, the control cam is a closed control cam.
In accordance with still an additional feature of the invention, the folder includes a spring element for maintaining continuous pretensioning between the open control cam and the control roller, the spring element being disposed between the respective supports and a guide body.
In accordance with another aspect of the invention, there is provided a method for transferring an end of a material web, after a cutting operation, to a first moving surface, which comprises: severing a copy from a material web in a cutting nip between the first moving surface and a second moving surface; extending a copy-guiding device and bringing it into contact with a leading end of the material web on the first moving surface, upon passage thereof through a cutting-nip outlet; gripping the leading end of the material web by holding devices moving out of the first moving surface during the passage thereof through the cutting-nip outlet; and retracting the copy-guiding devices into the second moving surface.
In accordance with another mode, the method according to the invention includes extending the holding devices on the first moving surface in a movement having a direction counter to a transporting direction of the material web through the cutting-nip outlet.
In accordance with a further mode, the method according to the invention includes causing outer sides of the copy-guiding devices to act upon the leading end of the material web and bring it into contact with the first moving surface.
In accordance with an added mode, the method includes superimposing a rotary movement on the retracting/extending movement of the holding devices.
In accordance with a concomitant mode of the method, during the retracting/extending movement of the holding devices, a control roller runs on a control cam, and a guide body forming a sliding surface for a support is pivoted by a rotation of an adjusting shaft.
Many different advantages are achievable with the foregoing features and modes of the invention. The holding or retaining devices allow the open material-w
Lanvin Serge
Smelten Eddie
Vauchelle Thierry
Gerrity Stephen F.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Stemer Werner H.
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