Sheet-material associating – Associating and folding – Sheet associating
Reexamination Certificate
1999-05-20
2001-06-26
Skaggs, H. Grant (Department: 3651)
Sheet-material associating
Associating and folding
Sheet associating
C270S020100, C270S019000, C270S041000, C270S042000, C493S424000, C493S434000, C492S038000, C492S049000
Reexamination Certificate
active
06250622
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to a compressible cylinder cap assembly for a cylinder in a folder apparatus arranged behind a rotary printing press.
BACKGROUND OF THE INVENTION
Under U.S. Ser. No. 09/124,907 on Jul. 30, 1998 a patent application has been filed entitled “Device for varying a cylinder's effective diameter”. This disclosure is related to a device for the variation of a cylinder's effective diameter. It includes a shell member being removably mounted on a surface of a cylinder. On said easy exchangeable shell members having a base plate, an elastic material is provided allowing for a compressible surface gain. The solution enclosed in U.S. Ser. No. 09/124,907 allows for facilitation of the cylinder's effective diameter, so as to provide a quick change of a cylinder's gain according to the requirements.
Due to the very thin surface coating the compensation achievable with the solution is very much limited.
U.S. Pat. No. 5,039,076 is related to a folder. In the case of a folder with at least two folding cylinders having cooperating folding members in the form of folding blades and folding jaws and intended for processing products of very different thickness, more reliable operation may be achieved if at least one folding cylinder has circumferential sections which are able to be adjusted in the radial direction. Setting means are provided for adjusting said circumferential sections in a radial direction, wherein said circumferential sections are arranged and tillable about an axis parallel to the cylinder's axis provided in an area of a leading end of said circumferential sections and with a trailing end of said circumferential sections being extendable in a radial direction by means of said setting means.
U.S. Pat. No. 5,000,433 is likewise related to a folder and more particularly to an adjustable folder for web-fed gravure presess comprising a collect cylinder. Said collect cylinder is able to be set for collect runs and non-collect runs and provided with holding elements (preferably in the form of grippers) and tucking blades having actuating elements preferably in the form of follower rollers which are operated by a respective cam, whose active cam part, which is preferably in the form of a recess, is adapted to be selectively exposed and covered over by means of a covering means which is coaxial to the cam and is provided with drive cam elements which are mounted on a cam element carriers coaxial to the cam and are able to be driven. In order to achieve a high degree of adaptablility as regards different types of collect operations the covering cam elements of the covering device are mounted on the cam element carrier in such a manner that they may be radially adjusted.
SUMMARY OF THE INVENTION
In the technical field, particularly in those applications where newspaper of higher page numbers, such as 48 or 64 pages are produced, much maintenance time is needed to get the folder in production after a system jam has occurred. To allow for a high degree of flexibility and deflection of a paper conducting cylinder's surface, such as a jaw cylinder or a folding blade cylinder, and to provide for a deflecting movement single strips have been mounted spaced apart from each other on the surface of a respective paper conducting cylinder. These strips manufactured of a closed cell urethane form attached to a plastic only provide for a limited deflection on the surface of a paper conducting cylinder such as a jaw cylinder. Upon production of newspaper of 48 pages and even more pages a higher degree of deflection on the respective paper conducting cylinder surface is required.
Accordingly, it is an object of the present invention to increase a paper conducting cylinder's ability to withstand major paper jams occuring between cooperating cylinders.
Further, it is an object of the present invention to reduce significantly broken or damaged cylinder parts.
Still further it is an object of the invention to provide for a cylinder surface design allowing for less maintenance time for repair during major paper jams.
According to the present invention a paper conducting cylinder in a folder comprises:
a plurality of cylinder surface sections mounted about the circumference of a cylinder,
said surface sections of layered structure having a compressible material adhesively attached thereto,
said surface sections being removably secured to mounting sections of said cylinder.
The advantages of the solution according to the present invention reside in the extremely short periods required to exchange the surface sections in case of a jam. Due to the compressibility of said cylinder's surface portions part of the cylinder surfaces deflect to the respective centre of said paper conducting cylinder and to create more space in the nip with regard to a cooperating cylinder. Thus, no parts of said complex paper conducting cylinders are damaged allowing for a fast start-up of the production again. Said surface portions being resiliently mounted on said cylinder body are apt for a deflection to a higher extent, thus allowing to transport even products such as newspaper having a higher number of papers without any adjustment to the nip.
According to further advantageous embodiments of the present invention said surface sections are layered structures and comprise a hard plastic stabilizing layer. By means of said hard stabilizing layer the rigidity of said layered structure of the entire surface section is enhanced. Further, said layered structure may comprise a cover having belt grooves. Besides of that below said layered structure of the surface sections a cap base is mounted between said surface sections and said mounting surfaces on the side frames of the respective paper conducting cylinder such as a collecting cylinder, a folding blade cylinder or a jaw cylinder.
Said hard plastic stabilizing layer which may be comprised of the layered structure acts as a belt drive, since said belt grooves provided in the cover on top of the layered structure has,spaced apart from each other, belt grooves, the bottom of which is constituted by said hard plastic stabilizing layer. Said cover having the belt grooves may be made of hard urethane or of a rubber material. The preferred thickness of said cover on top of said layered structure is a thickness between 3 and 8 mm, preferably 6 mm.
Said compressible material attached on the lower arc-shaped surface of said hard plastic stabilizing layer may be a foamed material adhesively bonded to said hard plastic. It's thickness is preferably in the range between 15 and 25 mm, preferably at 22 mm. Below said compressible material being a foamed compressible material a cap base is arranged being made of hard plastic or being made of metal. Said cap base comprises a flat surface with which said cap base is mounted to the respective mounting surfaces on the side frames of said paper conducting cylinder and an arc-shaped upper surface which corresponds to the arc-shaped curvature of said compressible material attached to the hard plastic stabilizing layer of said layered structure. Said entire surface sections being a layered structure are mounted by removable fastening means such as screws or bolts to said mounting surfaces on the side frames of said cylinder between said mounting surfaces of said cylinder and said surface sections a cap base as described above being arranged.
In said folding apparatus said paper conducting cylinder are for example folding blade cylinders having arranged a plurality of folding blades on the circumference. Said paper conducting cylinder may also be jaw cylinders, one of which is described in further detail below and said paper conducting cylinder may be collecting cylinders.
An advantageous application of the solution according to the present invention are folder apparatuses which are designed to a rotary printing press such as a web-fed printing press apt for newspaper applications. The device according to the present invention may be arranged in a pinless folder
Fowler Gary Frank
Garland Wayne Harvey
Novick Michael Alexander
Greenberg Laurence A.
Heidelberger Druckmaschinen Aktiengesellschaft
Lerner Herbert L.
Skaggs H. Grant
Stemer Werner H.
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