Severing by tearing or breaking – Severing by manually forcing against fixed edge – With feed-out of predetermined length from work supply
Patent
1991-10-01
1993-11-02
Jones, Eugenia
Severing by tearing or breaking
Severing by manually forcing against fixed edge
With feed-out of predetermined length from work supply
325 15, 325 72, 325 73, A47K 1036, B65H 3506
Patent
active
052577112
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for paying out web sections from a dispenser roll, wherein a slide surface moves a cutter member between an inoperative position during discharge and an operative position when a locking means is caught, the slide surface thus being stopped, the cutter member returning into the position of rest upon release of the locking means.
Apparatus for paying out web sections from a roll are known especially as paper towel dispensers. For this reason the invention will be described below with reference to a paper towel dispenser without, however, being restricted to this example. With the known towel dispensers, the user grasps the edges of the paper towel protruding at the right and left and pulls a length thereof from the supply roll. The dispensers in general are designed so that only a certain length can be withdrawn, and then the paper web is arrested. The user now may pull it against a serrated cutting edge disposed in the dispenser or at the dispenser so as to sever the web length pulled off from the supply roll. The tearing edge which usually is of toothed design is located in the direct vicinity of the leading end of the web which hangs out of the dispenser. Thus there is a risk that the user grasping the web will hurt himself at the tearing edge.
It is, therefore, the object of the invention to provide a dispenser which has a cutting member not located in the area of the hands of a user when he grasps the web so that, consequently, the cutting member cannot be touched.
A cutting mechanism for paper towel dispensers is known from DE-OS 28 36 709 operating with a movable knife which is located within the dispenser casing and acts in the manner of scissors. The paper web to be penetrated thus is moved by means of a crank drive between a stationary knife and a movable knife, the cutting of a web length taking place by spring pressure. The spring is tensioned by the slide surface which is wrapped in part by the paper web, and released by further mimics.
It is a disadvantage of this structure that rather strong forces must be exerted at the paper web to tension the knife actuating spring in order that the slide surface may be moved so as to tension the spring. In view of the fact, however, that such a paper web serves for drying wet hands, which means that it is always grasped with wet hands, the moisture dramatically reducing the strength of the paper, there is a risk that the leading end of the paper web hanging out will tear off without a sheet length first having been unwound.
It is another disadvantage that two knives must be used and that these knives slidingly pass each other accurately and, as a result, the cutting edges become blunt due to normal wear, a clean cut no longer can be achieved, and consequently paper jamming in the knife area is preprogrammed
These circumstances are to be avoided by the instant invention.
In an apparatus for paying out web sections from a dispenser roll, wherein a slide surface moves a cutter member between an inoperative position during discharge and an operative position when a locking means is caught, the slide surface thus being stopped, the cutter member returning into the position of rest upon release of the locking means, this problem is solved by the combination of the following features: the slide surface is embodied by an apportioning roller provided with a friction lining, its end surfaces are provided with a spiral guide to guide a thrust member to which a knife is pivotably connected, a knife lever with a return spring engages in the joint which connects the knife to the thrust member, the backside of the knife is provided with a knife bolt which engages in a release anchor, the release anchor is rotatably connected to the thrust member by a stay bolt and provided at its anchoring surfaces with stopper surfaces which constitute the locking means, together with the stop on the end surface.
When the dispenser is ready for operation the leading end of the web hangs out from the dispenser by such a length that a user can grasp
REFERENCES:
patent: 2193759 (1940-03-01), Birr
patent: 2206320 (1940-07-01), Grunwald
patent: 2592786 (1952-04-01), Birr
patent: 2974839 (1961-03-01), Batlas et al.
patent: 3107957 (1963-10-01), Batlas et al.
patent: 4131044 (1978-12-01), Cassia
patent: 4188844 (1980-02-01), DeLuco
Jones Eugenia
Scott-Feldmuhle GmbH
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