JP2014201443A - Tape cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter shape which can maintain cutting performance of a conventional tape cutter having a saw blade shaped cutter, realizing linear cutting excellent in appearance by suppressing a jag generated on an adhesive tape cutting part, and having less risk even if a user touches the cutter.SOLUTION: An edge ridge-line is formed by making a tip which is formed into a continuous triangular chevron shape thicker, and then locking an adhesive tape temporarily on the edge ridge-line. Thereby expansion strain of the adhesive tape during cutting of the adhesive tape is suppressed. At the same time, a flat adhesive tape temporal fastening part is provided on a position continuous to the edge ridge-line and higher than the position of the edge ridge-line, for preventing risk that a user touches the tip accidentally.

Description

  The present invention relates to a tape cutter that pulls out an adhesive tape from a roll around which the adhesive tape is wound and cuts the adhesive tape at an arbitrary position.

  There are many conventional examples of small-sized adhesive tape cutters that can be carried or placed on a desk and have blades punched out of a metal plate. The blade shape of this conventional example is typically a saw blade that ensures cutting ability as a saw blade connecting triangular mountain shapes.

  However, in a saw blade with many triangular peaks connected, the cutting trace of the adhesive tape is jagged and detracts from aesthetics, so the metal plate is punched straight with a press and the sharp burrs generated at that time are used as the blade. What was done is also known. (Patent Document 1)

  Furthermore, in a saw blade with many triangular peaks connected, the cutting marks of the adhesive tape are jagged, and at the same time the sight of the saw blade is sharp and dangerous for the user. Also known is a rectangular blade shape improved from both sides. (Patent Document 2, Patent Document 3)

Japanese Utility Model Publication No. S59-54451 Japanese Patent No. 4118911 JP 2012-56772 A

  However, in the first proposal (Patent Document 1), it is difficult to control the height of burrs in the press manufacturing process, and the burrs are easily worn out, so that the durability is poor.

  The second proposal (Patent Document 2) and the third proposal (Patent Document 3) are characterized by a rectangular blade shape instead of a saw blade. One point of the cutting edge is not an acute angle, but is composed of the intersection of three surfaces orthogonal to approximately 90 degrees, and the edge that contacts the adhesive tape is a ridge line extending from the intersection and having a certain length in the cutting direction Therefore, the base material of the pressure-sensitive adhesive tape has disadvantages such that a desired cutting cannot be performed unless the base material of the adhesive tape is hard and has low extensibility and can be easily sheared.

  As described above, the conventionally known methods have poor practicality and inferior cutting properties, and therefore further improvement has been desired.

  Therefore, an object of the present invention is to realize a blade that has a simple configuration, the cutting trace of the adhesive tape is not jagged, and has both cutting performance and safety.

  The present invention provides a pressure-sensitive adhesive surface of a pressure-sensitive adhesive tape by extruding a blade shape obtained by connecting a number of triangular ridge shapes in the longitudinal direction of the pressure-sensitive adhesive tape to a thickness that is at least three times the pitch of the adjacent triangular ridge shape. The apex of the triangular mountain shape that is in contact with the surface forms a blade ridge line in the direction in which the tape is pulled out, and the adhesive tape is temporarily fastened by the blade ridge line.

  The edge line of the blade was positioned on the same surface as the connected flat adhesive tape temporary fixing portion or was set at a low position.

  Cut the shape of the blades that are connected with triangles on the vertical vertical plane and use the cut surface as the blade. Divide the mold for molding on this vertical vertical plane so that the cutting edge has a sharp angle. Configured.

  According to the solution of the present invention, the adhesive tape is cut at the apex of the triangular mountain shape, and at the same time, the adhesive tape is temporarily fixed with a linear blade edge line having a certain length. Occurrence of a noticeable adhesive tape stretched portion is suppressed by the connected pointed blade edges, and the cut marks are not jagged.

  Moreover, since the flat adhesive tape temporary fixing part is connected to the same position as or higher than the edge of the edge, the edge of the edge is less likely to touch the user's fingers and safety is high.

  Further, the cutting edge at one end of the edge of the blade edge is formed by the vertical constituent surface, and the mold for molding is divided on the vertical constituent surface, so that the flow of the material having the viscosity of the resin to be molded can be obtained. It is easy to flow in a slight gap on the dividing surface of the mold, and a molding defect known as a short shot does not occur, so that a sharp edge can be realized.

  As described above, the effect of the present invention in which the adhesive tape cutting performance is improved and the safety is achieved by the edge line having a certain length in the longitudinal direction of the tape is clear.

It is a perspective view which shows the external appearance of the Example of this invention. It is a perspective view in the state where the cover of the example of the present invention was removed. It is an expansion perspective view of one cutter of the prior art example which is not based on this invention. It is an expansion perspective view of the blade edge of another conventional example which is not based on this invention. It is the A section expansion perspective view in FIG. It is BB sectional drawing in FIG. In addition, the adhesive tape abbreviate | omitted in FIG. 5 is also represented. FIG. 6 is an enlarged perspective view of another conventional cutting edge not according to the present invention. It is an expansion perspective view of the blade edge | tip of the Example of this invention. In the CC cross-sectional view in FIG. 8, the mold is also shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a tape cutter 1 according to an embodiment of the present invention is a box made up of a case 2 and a cover 3, and an adhesive tape 4 a guided by a roller 22 disposed on the case main body 21 is provided outside the case main body 21. Is temporarily fixed to the adhesive tape temporary fixing portion 23.

  As shown in FIG. 2, an adhesive tape roll support 20 is provided inside the case body 21, and the wound adhesive tape 4 is rotatably held.

  A conventional example will be described with reference to FIGS.

  FIG. 3 shows a conventional example. A cutter 5 in which a thin metal plate is punched is fixed to one end of a case body 21, and a recess 23 a that is a part of the case body 21 is placed behind the cutter 5 (on the right side in the figure). The adhesive tape temporary fixing part 23 is located. The recess 23a is provided for projecting the cutter blade 5a so as to contact the adhesive tape drawer 4a (not shown). The cutter blade 5a has a saw blade shape in which a large number of triangular mountain shapes are connected.

  FIG. 4 shows another conventional example, in which the blade edge 23 b is formed integrally with the case 21. Also in this example, as in FIG. 5, the recess 23a is provided, and the cutting edge 23b has a saw blade shape in which a large number of triangular mountain shapes are connected.

  The disadvantages of the above two conventional examples in which the cut marks of the adhesive tape are jagged will be described with reference to FIGS.

  As shown in FIG. 5, a large number of triangular mountain shapes and adjacent mountain shapes are arranged at a pitch P. Further, the apex of the mountain shape has a very small edge length L, and the edge length L is equal to or smaller than the pitch P.

  When the adhesive tape is cut using such a blade, as shown in FIG. 6, the adhesive tape drawer 4a pulled out by the user is stretched at the portion abutted against the blade edge 23b, and the adhesive tape extension 4b. Remains as a strain exceeding the elastic limit. This distortion is a major factor that jagged the cutting line of the adhesive tape.

  FIG. 7 shows another conventional example in which the jaggedness remaining on the cutting line of the adhesive tape is eliminated.

  In this conventional example, a rectangular blade shape is used instead of the saw blade, and the blade edge 23b is an intersection line of the vertical component surface 231 and the horizontal component surface 232 and is divided by the slit 233. There are a plurality of cutting edges 23b. At one end of the blade edge 23b, although not shown in the drawing, a method of breaking the adhesive tape lead-out portion 4a and cutting along the blade edge 23b is employed.

  However, one end of the blade edge 23b that triggers the breakage of the adhesive tape lead-out portion 4a is an intersection of three surfaces that are orthogonal to each other at about 90 degrees. Similarly, it is difficult to say that the cutting edge 23b, which is a line, is sharp.

  Due to the above factors, the conventional example of FIG. 7 is practically limited to a tape whose base material is a material having low elasticity and easy to shear.

  FIG. 8 shows an embodiment of the present invention. A blade edge 23b having triangular crests connected to each other has a crest-shaped apex that is pushed out by a ridge line length L in the longitudinal direction by a pressure ridge line L (not shown). 23c is formed.

  Since the cutting edge 23b is a set of mountain-shaped vertices, the cutting property of the adhesive tape is good.

  Further, the edge line 23c is connected at the same height as the flat surface of the adhesive tape temporary fixing portion 23 behind (right side in the drawing).

  Further, the edge line length L is sufficiently long with respect to the pitch P of the triangular mountain shape, and the adhesive tape lead-out portion (not shown) can be temporarily fixed, and at the same time, the adhesive tape extending portion 4b (not shown) ) Can be suppressed.

  Here, the relationship between the pitch P and the edge line length L in the embodiment of the present invention will be described.

  Since the tape base material to which the adhesive material is applied is wound, an elastic material such as BOPP is used. In an elastic material, strain due to a force applied in one direction propagates in the orthogonal direction, and the ratio between the two is known as the Poisson's ratio.

  For common elastic materials, this Poisson's ratio is between 0.4 and 0.5. That is, it indicates that a strain that is less than half of the strain generated in the same direction as the force applied in one direction occurs in the orthogonal direction.

  In the case of the embodiment of the present invention, a pulling force is applied to the adhesive tape leading portion 4a in the longitudinal direction, in other words, the direction along the edge line length L. As a result, distortion also occurs in the perpendicular direction, in other words, the direction along the pitch P.

  Although it has been implemented and verified in many conventional examples that it is effective to reduce the pitch P as much as possible in order to suppress distortion in the direction along the pitch P, it is along the edge line length L. There is no conventional means for suppressing the directional distortion.

  Therefore, in the present invention, focusing on this point, the Poisson's ratio of the adhesive tape is assumed to be 0.4, and the edge line length of the reciprocal 1 ÷ 0.4 = 2.5 times or more with respect to the pitch P. The adhesive tape was temporarily fastened by the length 4a, distortion in the longitudinal direction of the adhesive tape was suppressed, and jaggedness generated on the adhesive tape cutting line was suppressed.

  FIG. 9 is a cross-sectional view showing the mold 6 at the time of molding in the embodiment of the present invention.

  The blade edge 23b is generated on the surface of the die abutting portion 6c where both the die movable portion 6a moved in the movable portion moving direction SA and the die fixing portion 6b abut against each other. Therefore, the gas generated from the resin does not stay and the cutting edge 23b can be formed into an acute angle shape. Further, it is possible to intentionally generate the burr 23d on the blade edge 23b, and it is possible to form a sharper blade edge 23b. The mold movable part 6a and the mold fixing part 6b may be movable, or the fixed mold and the movable mold may be interchanged.

  As mentioned above, although the Example of this invention was shown, various applications are possible in the range which does not deviate from the meaning of this invention, and the effect of this invention is remarkable especially in a compact portable tape cutter. is there.

DESCRIPTION OF SYMBOLS 1 Tape cutter 2 Case 20 Adhesive tape roll support part 21 Case main body 22 Roller 23 Adhesive tape temporary fixing part 23a Indentation 23b Blade edge 23c Blade edge line 23d Burr 231 Vertical composition surface 232 Horizontal composition surface 233 Slit 3 Cover 4 Adhesive tape 4a Adhesive tape drawer Part 4b Adhesive tape temporary fixing part 5 Cutter 5a Cutter blade 6 Die 6a Die movable part 6b Die fixed part 6c Die abutting part SA Movable part moving direction L Edge line length P Pitch

Claims (3)

A tape cutter in which an adhesive tape coated with an adhesive material and wound is housed in a case, and a blade tip for cutting the adhesive tape is planted at one end of the case, the blade tip connecting a number of triangular mountain shapes The apex of the triangular ridge shape in contact with the pressure-sensitive adhesive tape formed an edge line having a length in the longitudinal direction of the pressure-sensitive adhesive tape that is at least three times the pitch of the adjacent triangular ridge shape. A tape cutter characterized by that. Whether the flat adhesive tape temporary fastening portion with which the adhesive tape abuts is connected to the edge line of the blade, and is the flat adhesive tape temporary attachment portion with which the adhesive tape abuts on the same surface 2. The tape cutter according to claim 1, wherein the edge of the blade is located at a position lower than a flat surface of the adhesive tape temporary fixing portion. The case and the blade edge are the same member, and are integrally molded with resin, and the mold for the integral molding is divided on the longitudinal surface constituting the blade edge so that the blade edge has a sharp corner. The tape cutter according to claim 1.

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