Cutting – Cutting motion of tool has component in direction of moving... – With means to render cutter pass ineffective
Patent
1997-08-07
2000-08-22
Rachuba, M.
Cutting
Cutting motion of tool has component in direction of moving...
With means to render cutter pass ineffective
83331, 83674, 83677, 156536, B26D 156
Patent
active
061054798
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a variable-diameter knife roll comprising a knife extending parallel to the axis of the roll placed generally radially on a diametral plane, such knife being mounted on a knife carrier able to be adjusted radially outwardly and inwardly.
BACKGROUND OF THE INVENTION
Knife rolls for making transverse separating cuts or cuts in the form of rows of perforations have become known in various different designs. The term "knives" is employed herein to denote both those producing smooth cuts and also lines of perforations. In accordance with the different formats of the blanks, preferably in the form of bag blanks, webs of paper or plastic must be provided with transverse cuts and more especially with transverse perforation cuts or lines at different distances apart. There is consequently a need for a way of setting knife rolls to different formats rapidly and simply.
SUMMARY OF THE INVENTION
One object of the invention is hence to create a knife roll of the type initially mentioned which may be rapidly and simply reset to different formats, that is to say to different distances apart of the cuts made in a continuously supplied web.
In accordance with the invention this aim is to be attained with a knife roll of the type initially mentioned wherein the knife carrier is articulatingly connected with the joints connecting the two links of two expanding grilles or with respectively one of the arms extending past such joints, of one of the links of the two expanding grilles, and wherein respectively one inner joint of a link of one of the two expanding grilles is arranged fixedly on a knife roller shaft and the respectively other inner joint of the other links is arranged for adjustment in the axial direction on or in the knife roll shaft. The radial distance of the knife carrier and accordingly the format of the blank to be cut from the web or separated therefrom by lines of transverse perforations may be set in a simple way using the knife roll of the invention just by adjustment of the inner joints of the one set of links of the expanding grilles in the axial direction.
It is convenient for the knife roll shaft to be a hollow shaft, wherein a slide is guided for axial sliding movement and on which the adjustable inner joints of the other set of links are arranged, the slide arrangement being provided with a setting drive.
The setting drive may comprise a lead screw nut connected with the slide arrangement and a lead screw able to be screwed into same.
In order to perform radial adjustment of the knife carriers, the lead screw may be held so that while being unable to be moved in relation to the hollow shaft in the axial direction, it can be turned in relation to same after slackening of a holding or arresting device.
In accordance with a preferred development of the invention the lead screw is mounted on a radially extending carrier of the hollow shaft for free rotation in the same, furthermore on a terminal section of the lead screw a bushing is mounted non-rotatably but in an axially sliding fashion, such bushing being able to bear via an annular shoulder against an annular counter shoulder on the hollow shaft or a housing connected with same, with a braking effect and which is acted upon by a compression spring encircling the section, which compression spring bears at one end against the bushing and at the other end against a collar or a nut screwed on the lead screw, and furthermore means is provided for dislodging the bushing from its braking position for holding the bushing in a non-rotatable fashion. This development of the invention renders possible a simple adjustment of the knife carriers because, with the bushing thrust in and held in a non-rotatable manner, the hollow shaft is turned so that via the lead screw nut the slide arrangement is shifted in the hollow shaft and the knife carrier is set in the desired manner.
The means for dislodging and holding the bushing may comprise a piston and cylinder unit operated by fluid under pressure and fixed in relation to the frame, t
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Feld Karl-Heinz
Kuckhermann Gustav
Neier Heinz
Rachuba M.
Windmoller & Holscher
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