Cutting – Tool with either work holder or means to hold work supply – Rotatable wound package supply
Reexamination Certificate
1998-09-16
2003-04-29
Arbes, Carl J. (Department: 3729)
Cutting
Tool with either work holder or means to hold work supply
Rotatable wound package supply
C083S436500, C083S444000, C083S611000, C156S574000, C156S577000, C225S011000, C225S014000, C225S015000, C225S016000
Reexamination Certificate
active
06553884
ABSTRACT:
The invention relates to an adhesive tape dispenser with a cutting-off device which has a blade, and to its use for cutting off adhesive tapes without injury.
PRIOR ART
Roller-type dispensers for rolls of adhesive tape serve the user as a receptacle for storing the rolls of tape themselves and as an application aid when putting them to use. The primary task of an adhesive tape dispenser is the simple, easy and neat cutting to length of strips of adhesive tape in the length required for the intended use. Typical embodiments of dispensers comprise as basic elements a supporting housing, a roll receiving means in the form of a core, a rest for the adhesive tape and a cutting off or tearing off device. A distinction can be drawn between the following basic embodiments:
Dispensers of a usually very compact form (also referred to below as compact dispensers), comprising an open or closed housing, which, in side view, may be, for example, of a round, trapezoidal, rectangular or polygonal shape. For use, the roll of adhesive tape is put onto a usually cylindrical core receiving means, which is integrated approximately centrally in the housing. To the side, the dispenser contains a slit-like outlet gap, from which the adhesive tape is drawn out for cutting to length. The cutting blade by means of which a piece of adhesive tape of the desired length can be cut off is usually located on one side of the outlet slit. The side of the outlet slit opposite the cutting blade is usually intended as a receiving surface for the tacky side of the adhesive tape and is formed in such a way that a piece of self-adhesive tape adhesively fixed thereon can be easily lifted off. An exemplary embodiment of a corresponding dispenser is described in WO 95/23108.
Dispensers in which the housing receiving the roll of adhesive tape and of an open or closed design is spatially separate from the elements comprising the adhesive tape rest and the cutting blade. Corresponding dispensers are in widespread use as hand held dispensers and as desk-top dispensers. With reduced compactness, they offer the advantage that adhesive tape can be removed quickly and simply and one-hand operation is often possible. An exemplary embodiment of a corresponding dispenser is described by U.S. Pat. No. 4,059,210.
Dispensers in which the adhesive tape required can be transferred directly to the substrate, for example via a guide roll which at the same time acts as a pressure-exerting roll and (also referred to below as transfer dispensers). For cutting to length, the pressure-exerting roll has ahead of it a cutting blade or a comparable device by means of which the adhesive tape can be cut off, for example by a slight rotational movement of the dispenser. An exemplary embodiment of a corresponding dispenser is described by WO 96/06790.
For cutting to length a section of adhesive tape of the desired length, a corresponding piece of adhesive tape is unrolled and is cut off with the cutting blade. The form and materials of suitable cutting blades vary. Blades with a serrated cutting edge (blade edge) are used most frequently. In the case of injection-moulded dispensers, the serrated edge may be produced in the injection moulding process itself (see, for example, tesa Film-Abroller [roll dispenser] 55975-87). It is also customary to integrate into the dispenser a metal cutting blade. Among the advantages offered by metal blades in comparison with plastic serrated edges are greater mechanical strength and greater sharpness, so they are more durable and more flexible in use with respect to the materials which can be cut (for example with respect to film thickness or film type). To avoid injuries being caused by accidentally touching the blade edge, for example with the fingers, numerous proposals have been made. For instance, FR 2710331 “Dérouler de ruban adhesif” [adhesive tape roll dispenser], U.S. Pat. No. 5,022,576 “Lever operated protective cover for a saw tooth-shaped cutter”, U.S. Pat. No. 5,393,367 “Tape dispenser with a protected cutting device” and U.S. Pat. No. 5,456,790 “Tape dispenser with a blade protector” describe various forms of protective covers for the cutting blade which can be moved manually or by means of an automatic mechanism, to the greatest extent exclude the possibility of the user being injured by the blade and at the same time serve as a guard to prevent damage to the blade. Examples of adhesive tape dispensers in which the cutting blade is available only when the dispenser is in use are described in JP 080112171 “Tape cutter”, WO 95/23108 “Dispenser for adhesive tape and the like” and U.S. Pat. No. 5,456,790 “Tape dispenser with a blade protector”.
A disadvantage of dispensers with serrated cutting blades is that self-adhesive films which use backing materials of low tear propagation resistance and low ductility in particular cannot be detached again satisfactorily from many adherend surfaces. This applies in particular to adhesive films which use as a backing highly stretched biaxially oriented films based on it-PP homopolymers, but equally to highly stretched films based on other highly crystalline polyolefins as well as biaxially stretched PETP, to name just a few. When using a dispenser blade with a serrated cutting edge, when a strip of adhesive film is cut off there is an impression of the structure of the teeth on the cut edge of the adhesive tape cut to length. The serrated blade edge and any sharp burr or damage there may be on the blade very often cause extremely fine tears in the cut edges of the adhesive film strips obtained. As a consequence of the impression left of the structure of the teeth and the said extremely fine tears in the cut edges of the adhesive film strip, the attempt by the user of the adhesive tape to detach an adhesively fixed adhesive film strip once again from the adherend surface in one piece very often fails. Rather, adhesive films often tear, starting from the existing cut edges, when it is attempted to detach them again. For the complete removal of an individual adhesive film strip, it is not uncommon for a laborious procedure to be subsequently required to prise the strip off the adherend surface. Difficult to remove remains of an adhesive film, remains of adhesive substance on the adherend surfaced as well as damage to sensitive underlying surfaces consequently cannot be ruled out.
The use of sharp smooth-edged cutting blades makes it possible for the aforementioned self-adhesive films to be detached again satisfactorily, since in this case there is no damage to the cut edges in the form of tears and the smooth form of the blade means that the cut edge is straight. For many applications, a smooth cut edge of the adhesive film is also desired for aesthetic reasons or else is advantageous or necessary for technical reasons, the latter for instance if the adhesive strip is to be used on a document to be photocopied and it is required that there is no or only minimal shadowing on the copies. For instance, DE 29616409 describes an adhesive film roll dispenser which uses commercially available exchangeable razor blades, as a result of which copying defects and soiling of the cutting blade edge do not occur. The tesa-Tischabroller [desk-top dispenser] 6082 uses smooth blades which make possible an absolutely straight cut edge of the adhesive tape to be cut into portions. Adhesive film strips which use a biaxially oriented PP backing, for example tesa-Multi-Film or tesa-Practic-Film, cut to length with the tesa-Tischabroller 6082, can be satisfactorily detached again in virtually all cases. However, injuries to the fingers in particular cannot be ruled out when the aforementioned dispensers are used. U.S. Pat. No. 4,175,685 describes an adhesive tape dispenser which uses a cutting unit containing a razor blade. To protect against injuries, a flexible filament-like material is wound spirally around the blade. The edge of the razor blade is accessible between individual turns of the spiral. A transversely cutting smooth blade, integrated into a blade
Hazes Hans
Kubasch Peter
Leiber Jörn
Linde Hansjürgen
Lühmann Bernd
Arbes Carl J.
Norris & McLaughlin & Marcus
tesa AG
Trinh Minh
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