Cutting – Processes – Cut advances across work surface
Patent
1991-10-03
1993-12-21
Yost, Frank T.
Cutting
Processes
Cut advances across work surface
83485, 83595, 83835, B26D 118
Patent
active
052713024
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP91/00138 filed 24 Jan. 1991 and based, in turn, upon German National Application P 40 03 801.7 filed 8 Feb. 1990 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a method of severing a web of material, specifically a paper or cardboard web, where a cutting means of circular shape, journaled rotatably in a slide, is moved along a cutting line by means of a linear drive. The invention also relates to a cutting means for the implementation of the method.
BACKGROUND OF THE INVENTION
In web-handling machinery, e.g. winding and unwinding machines for cardboard or paper webs, it is necessary during replacement of rolls to sever the webs transversely in a reliable manner.
For this purpose, various cutting means are utilized, depending on the weight per area of the web, which exhibit various disadvantages Thus, fixed blades fastened upon a knife slide must be replaced frequently because of wear, cutting beams with toothed knives require very high cutting forces, and driven circular knives utilized for high web weights per unit area require in addition to the linear drive for this procedure an additional rotary drive.
In order to avoid the need for a rotary drive for a driven circular knife, a transverse cutter is proposed in DE-PS 36 38 777, which has a wheel rigidly connected to a knife shaft and which rolls along a rod running parallel to the track of the slide carrying the knife. Due to the geometric and friction interaction between wheel and rod a rotary motion is imparted to the circular blade by the linear motion of the slide carrying the knife.
OBJECT OF THE INVENTION
It is the object of the invention to improve upon earlier methods and apparatus for cutting ga web so that the cutting of webs of materials of varying weights per unit area is simplified.
SUMMARY OF THE INVENTION
This object is attained in a method of severing a web, particularly of paper or cardboard, whereby a circular cutting blade journaled rotatably in a slide is moved by a linear drive along the cutting line. According to the invention, the cutting blade consists of a rotationally journaled disk-shaped base body, which is tipped on its entire perimeter with pointed knife blades angled in the sense of rotation. The distance from the slide to the web is so chosen that only the knife blades penetrate the web and note the base body. The knife blades are further so shaped and arranged that upon their penetration of the web to the maximal depth of penetration an uncut section remains between two cutting blades, which is severed upon the exit of the succeeding cutting blade by its leading cutting edge.
The apparatus thus is characterized by the fact that the cutting means consists of a disk-shaped base body journaled freely rotatable, which upon its entire perimeter is provided with pointed cutting blades angled in the sense of rotation, whereby the distance between the slide and the web is so chosen that only the cutting blades not the base body penetrate the web, and that furthermore the cutting blades are so shaped and arrayed that upon penetration of the web up to the maximal depth of penetration, an uncut section remains between two cutting blades, which is severed upon exit of the subsequent cutting blade by its leading cutting edge.
According to the invention, the knife blades only perforate upon penetration into the web, so that upon maximum depth of entry, there remain uncut bridges in the web between the knife blades. Only upon exiting from the web are these uncut bridges severed by the knife blades, so that the web is totally severed. Thus, a torque is produced on the circular cutting means by the knife blades being in the penetration phase due to the relative motion between web and the slide carrying the knives which suffices for the severance of the bridges by the exiting knife blades. Thus, the cutting means does not require a separate rotational drive nor power transmission elements which, as in the
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Thievessen Karl
Weis Manfred
Welp Ewald G.
Dubno Herbert
Jagenberg Aktiengesellschaft
Peterson Kenneth E.
Yost Frank T.
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