Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Reexamination Certificate
1998-09-02
2001-08-28
Vo, Peter (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
C493S194000, C083S698410, C083S343000
Reexamination Certificate
active
06280373
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention:
The invention relates to a cutting tool support, especially on a rotating cylinder in rotary printing presses, and more particularly to a device for cutting a web of material in a folder, particularly, of rotary printing presses, the cutting device having a cutting tool, such as a knife, accommodated on a cutting cylinder, and pressure bars of elastic material flanking the cutting tool or knife with which the pressure bars are in immediate contact, the pressure bars projecting resiliently beyond or past a jacket of the cutting cylinder.
German Patent 1 611 282 relates to a device for cutting a paper web in a folder. A cutting knife is secured between clamping bars in a knife cylinder formed with a longitudinal groove. The cutting knife is flanked on both sides thereof by resilient pressure bars of soft elastic plastic material which directly contact the cutting knife and project beyond the jacket of the knife cylinder. The pressure bars have a radially outwardly extending taper in the region of the length thereof projecting beyond the jacket of the knife cylinder, and impart a given elastic resilience in the circumferential direction to the cutting knife.
The published German Patent Document DE 44 24 919 C1 is concerned with a cutting knife bar of a cutting cylinder in folding units of web-fed rotary printing presses. To support a cutting knife in a vibration-damping manner and to avoid damage to a product or copy, contact-pressure strips or bars of synthetic rubber with a fine cellular structure are used.
The published German Patent Document DE 42 44 786 A1 is concerned with a device for adjusting a cutting knife bar or strip for a cutting cylinder in a rotary printing press. In this adjusting device, there is provided a device for displacing cutting knife strips or bars on a cutting cylinder for cutting a length of paper web crosswise both for collect-run and noncollect-run production which should be of compact construction and simple to operate. This is achieved by providing the cutting knife strips or bars, on a bottom surface thereof, with circular slits in an acute angle, with stay bolts engaging in the slits and, in turn, being movable by a drive in axial direction, so that the cutting knife strips or bars are capable of moving circumferentially on the cutting cylinder.
In high-speed folders, multilayer lengths of paper web entering between the pair of cutting cylinders exert major forces on the cutting tool support. The half of the cutting knife support oriented towards the web of material is especially severely stressed. Due to the high stress and the elasticity of the pressure bars, premature fatigue can occur thereat, which becomes apparent by the development of cracks in the material of which the pressure bars are formed. This impairs the support of the cutting tool on both sides thereof.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a cutting tool support of such construction that it optimally supports the cutting tool without being vulnerable to material fatigue.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, in a device for cutting a web of material in a folder having a cutting tool accommodated on a cutting cylinder, a cutting tool support which includes pressure bars of elastic material flanking and directly engaging the cutting tool, and projecting resiliently beyond a jacket of the cutting cylinder, the pressure bars being formed of an elastic base material and a contact material having a greater hardness than hat of the base material, the base material of the pressure bars being in engagement with the web of material during the cutting of the web of material.
In accordance with another feature of the invention, the pressure bars are embedded in a vise embracing the pressure bars.
In accordance with a further feature of the invention, the vise includes two vise halves.
In accordance with an added feature of the invention, the vise has clamping surfaces for acting upon the pressure bars.
In accordance with an additional feature of the invention, the vise halves are formed with clamping surfaces between which the cutting tool is received.
In accordance with yet another feature of the invention, the base material of the pressure bars has a Shore hardness between 30 and 35 Shore.
In accordance with yet a further feature of the invention, the contact material has a Shore hardness greater than 85 Shore.
In accordance with yet an added feature of the invention, the contact material is disposed in a region of the pressure bars that projects beyond the vise.
In accordance with yet an additional feature of the invention, the cutting tool has a tip and is formed with a taper in a region of the cutting tool tip.
In accordance with still another feature of the invention, the pressure bars surround the cutting tool and are spaced from the tapered cutting tool tip, so that the tapered cutting tool tip does not engage the surrounding pressure bars.
In accordance with still a further feature of the invention, the cutting tool is a cutting knife.
In accordance with another aspect of the invention, there is provided, in a folder, a combination comprising a cutting cylinder having a cutting knife disposed thereon for cutting a material web, and pressure bars formed of elastic material flanking and directly engaging the cutting knife and projecting resiliently beyond a jacket of the cutting cylinder, the pressure bars surrounding the cutting knife and being formed of elastic base material and a contact material having a hardness greater than that of the base material, the elastic base material being in engagement with the material web during the cutting thereof.
In accordance with a concomitant aspect of the invention, there is provided a folder having a device for cutting a material web, and comprising a cutting cylinder, a cutting knife disposed on the cutting cylinder, and pressure bars of elastic material flanking and directly engaging the cutting knife, the pressure bars projecting resiliently beyond a jacket of the cutting cylinder, the pressure bars surrounding the cutting knife being formed of an elastic base material and a contact material, the contact material having a hardness greater than that of the base material, the elastic base material being in engagement with the material web during the cutting thereof.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a cutting tool support, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, wherein:
REFERENCES:
patent: 3277756 (1966-10-01), Jardins et al.
patent: 4784031 (1988-11-01), Dixon
patent: 4862778 (1989-09-01), Dixon
patent: 44 24 919 C1 (1995-09-01), None
Greenberg Laurence A.
Heidelberger Druckmaschinen
Huynh Louis K.
Lerner Herbert L.
Stemer Werner H.
LandOfFree
Cutting tool support does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cutting tool support, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting tool support will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2515095