THE FIELD OF THE ART The tape cutter with double edged knife (blade) is a mechanism used to cut plastic, paper, textile, and other tapes. It is adjacent to the surface of the tape or inside the cylinder on which the tape is rolled or in any other way. The knife with which the tape is cut has two edges and the second edge is used after the first one is worn out. That is, the tape cutter has an embodied spare knife.

THE BACKGROUND OF THE INVENTION

Up to the present day, a variety of known tape cutters can be found in search engines on the web by typing "tape cutter" and "tape dispenser". Regardless of the type of tape and type of cutters which are available on the world market, either tapes for box packaging (tape cutter) or office tapes (tape dispenser) or anything else, they all have a common feature: the mechanisms are equipped with a single edge knife with which the tape is cut. When it is worn out, as is usually the case with most cutters, or when it cannot cut because the tapes are of different thickness and different material, the consumer is forced to buy a new one, either by laying up or throwing the old one away. The ability of the user to change the knife of the cutter results in an immediate economic benefit and a better practical result. Moreover, there is a saving in raw materials and energy that would be consumed to manufacture new cutters, that is, to reduce unnecessary consumption.

The advantage of this invention is that a spare knife is embodied into the tape cutter (for packaging, office, etc.).

The cutter carrier is made of plastic, metal, wood, etc., while the knife can be made of the same or different material from its carrier, be of a specific type, that is, either with an edge without any teeth, with few or many teeth, with small or large depth of teeth, or with a straight or oblique edge, etc. and finally, the two edges of the knife can be different from one another. In this way, the cutter is more practical and has a double lifetime.

BRIEF DESCRIPTION OF THE DRAWINGS

Applications of the invention are described below with reference to the attached drawings in which;

Figure 1 shows a tape cutter with an embodied spare knife, which is fixed to the roll and is adjacent to its surface so that it can slide on it according to the invention.

Figure 2 shows a detail of Figure 1 presenting a knife with two edges.

Figure 3 shows a tape cutter with a spare knife sliding on its roll, which forms a ring around the tape according to the invention.

In the following description, due to the symmetry of the tape cutter with respect to the plane which is parallel to its sides, passes between them and is equally spaced from each side, the descriptions refer to half of it.

DETAILED DESCR1PT1QN OF PREFERRED EMBODIMENTS

Figure 1 shows the tape cutter with an embodied spare knife (4) sliding on the tape roll (1), which consists of the tape (2) which is of various materials and the paper, plastic, etc. cylinder (3) on which the tape is wrapped. The tape cutter with an embodied spare knife (4) is made of plastic, metal or any other material and consists of the vertical sides (5) and (6) whose distance is greater than the width of the tape, and the beams of any shape, (7), (8) and (9), which connect the two sides (5) and (6) to each other in different ways. The bottom of the beams (7) and (9) is adjacent to the surface of the tape (2), and the distance between them is smaller than the outer diameter of the cylinder (3).

There is also a toothed, straight etc., two-edge knife (10), with projections (11) on both sides which penetrate into holes of the same shape (1 ) located on the sides (5) and (6) of the cutter. The knife is positioned there after the projections (11) are slid into the slides (12) which are on the inner surface of the sides (4) and (5), and finally, by utilizing the material elasticity, the projections (11) get into the openings (11'). When the edge of the knife is worn out, following the opposite procedure, the knife gets out of its position, rotates 180 ^e and is put in the same position so as to cut with its new edge.

All the parts of which the cutter (4) is made, can be manufactured or molded separately and finally, after being assembled together in various ways, form the cutter.

The cutter is put on the tape by pushing it towards the center of the cylinder. The springs (14) which are on both sides (5) and (6), subside together with the projections (15) which are at the edge and inside of the springs until they penetrate inside the cylinder (3), with the beams (7) and (9) adjoin the surface of the tape. That is, in its operating position, an open ring around the tape (1), with the roll rotating freely within the open ring. When the tape is finished up, the tape cutter with the embodied spare knife gets out of the cylinder (3) and is put onto a new roll in the same way.

In case that the material of the sides (5) and (6) is sufficiently flexible then the springs (14) are eliminated, and the projections (15) are on the sides of the cutter.

In case that it is not possible to have the springs (14) on the sides (5) and (6) of the cutter, either because we do not wish or because of the inflexibility of the material, then in the position of the projections (15) there is an opening through which there is a restraint axle fixed in different ways on the sides, so as the cutter to be fixed on the tape roll of which, in this case, the width may be much smaller than the distance between the sides (5) and (6). When the tape is finished up, we take off the restraint axle and remove the cutter from the cylinder. Furthermore, there may be two short restraint axles instead of one, each one of which is fixed into the opening of each side and have open - closed or in-out operating positions. We can still have more than one openings on the same side and in a different height for the restraint axle or the two short restraint axles so that it/they to be moved upwards, when the tape roll diameter is being reduced.

The cutter works as follows. The user passes the start of the tape between the beams (7) and (8), and unrolls the tape by pulling it. As the tape unrolls, the cutter is freely rotated onto the roll. Then, the user cuts the tape with the knife (10). At the same time, the tape adheres to the beam (8), so that the next time it is easy for the user to get the start of the tape by passing his index finger from the gap (13).

For practical reasons such as increasing the durability of the cutter, reducing the cost of the molds with which the cutter or some of its parts are molded, various combinations can be made such as joining the beam (8) with the knife (10) or the beam (8) with the beam (9), the knife (10) fixed onto the sides (5) and (6) and at the same time on the beam (9) or only onto the beam (9), or onto the surface that connect beams (8) and (9). Also, the projections (15) may be separate pieces sliding on the spring (14) and being adjustable accordingly as the outer diameter of the tape is reduced.

Finally, the springs (14) can be replaced by arms which can turn outwards. The rotation axle and a slot for the rotation axle of the arms are at the position of the spring base and the arms clasp on the sides in any way. Figure 2 shows the detail of the tape cutter with an embodied spare knife {4), and in particular the knife (10) which has two edges diametrically opposed, while at its edges there are the projections of any shape (11) which fit into the openings of the same shape (11') and are positioned on the sides (5) and (6). The knife can be in any position between the beams (8) and (9) but also beyond the beam (9).

The edges of the knife can be different and vary in number of teeth, in shape, etc., and the appropriate knife is adjusted according to the use. Also, the knife may consist of a carrier on which the two-side blade is adapted. In this way a combination of different materials can be made, as for example, the carrier being plastic and the blade metal.

The support of the knife as well as of the beams on the sides (5) and (6) of the cutter can be made in any convenient way. This has to do with the materials from which the different parts of the cutter are made, the way of the molds manufacturing etc..

Figure 3 shows the tape cutter with an embodied spare knife (20) sliding on the tape roll (1), which consists of the tape (2) and the cylinder (3) on which the tape is rolled. On the outer surface of sides (21) and (22) of the cutter (20), there are projections (23) and (24) respectively, whereby a spring or other flexible or elastic means or inflexible material in a P shape, or a string (25) which then passes through the inside of the cylinder (3) and is fixed onto the other projection, which is on the opposite side of the cutter, forming a ring around the tape. This cutter can be placed on a role regardless of its thickness, that is, of the short or long length of the tape. When the tape ends, the spring (25) or any other connecting element is disengaged from the projections (23) and (24), the cutter (20) comes out and is placed on another packaging tape roll, office tape roll etc..