JP2001314669A - Scissors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide scissors that helps easily form bent portions provided for preventing an adhesive of an adhesive tape from sticking to the blades of the scissors. SOLUTION: Scissors 11 comprise a first blade 12a and a second blade 12b, each having a blade portion 21 provided with a cutting edge 23, and a connecting rotating shaft 13 connecting the blades 12a and 12b. The blade portion 21 is provided with a front notch 24 and a rear notch 25, and by forming bent portions 27 where the tip of the blade portion 21 is bent by a prescribed angle α toward the opposing blade portion 21 side at a bending line 26 connecting the notches 24 and 25, a clearance d is formed on the rear side of the blade portion 21. A resin washer 37 as a clearance retaining member is inserted into the connecting rotating shaft 13 between the first blade 12a and the second blade 12b. The prescribed angle α is preferably 10 to 15 degrees and a prescribed angle β is preferably 2 to 12 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of cutting a pressure-sensitive adhesive tape or the like by forming a gap on the back surface side of a bent portion of each blade. And a scissors configured to be hardly attached to the blade body. More specifically, the present invention relates to scissors configured so that the bent portion can be easily formed.

[0002]

2. Description of the Related Art Conventionally, scissors of this type include a pair of cutting blades each having a handle portion and rotating relatively to perform a cutting operation, and a fulcrum serving as a center of rotation of the pair of cutting blades. And each of the cutting blades is known to have a bent portion formed by bending a portion on the blade surface side along the cutting edge to the opposite cutting blade side by a minute angle. By forming the bent portion, the scissors can form a portion similar to a back gap on the back of each cutting blade centering on the folding line of the bent portion, and a cutting operation of rubbing the cutting edges. In this case, the backs of the two cutting blades do not come into contact with each other due to bending of the bent portion, and always maintain a separated state.

[0003] For this reason, even when the tape or sheet or the like to which the adhesive is applied is cut, even if the adhesive is not cut properly and goes around from the cutting edge of the cutting blade to the back, the other cutting blade may cut the back. There is no strong pressing. Therefore, when the cut tape or sheet is removed, the adhesive is also peeled off, so that the adhesive is deposited on the back of the cutting blade, so that there is no trouble such that the scissors do not move.

[0004] Further, a notch is formed at the base of each bent portion so as to extend from the blade edge side toward the ridge side so as to exceed the bent width of the bent portion. With this configuration, in each of the cutting blades, a bent portion having a predetermined bending angle can be easily formed simply by bending the gap between the notch portion and the cutting edge along the cutting edge. In other words, since the base end side of the bent portion is defined by the notch portion, the bent portion does not reach the overlapping portion of the cutting blades around the support shaft, and the bending angle of the bent portion is eventually changed. It can be made constant also in the part.

[0005]

However, in the conventional scissors, a notch is provided only at the base of the bent portion. Therefore, when the bent portion is formed, the notch is formed by the notch. Positioning of the proximal end of the wire could be easily performed. However, since the notch was not provided on the tip side of the fold line, the positioning could not be easily performed, and the bent portion having a desired shape could not be easily formed. .

The present invention has been made by paying attention to the problems existing in the prior art as described above. An object of the present invention is to provide a scissor which can easily form a bent portion provided to make it difficult for the adhesive of the adhesive tape to adhere to the blade of the scissors.

[0007]

In order to achieve the above object, a scissor according to the first aspect of the present invention comprises a blade having a cutting blade provided on one side edge of the abdomen, and a base end of the blade. A pair of blades provided with a gripping portion, and a scissor provided between the cutting blade and the gripping portion with a connecting rotation shaft for connecting and rotating both blades, wherein Notches are provided at the base end of the blade and at the back side of the distal end of each blade, and the front end of each blade is bent at a predetermined angle toward the opposing blade at a fold line connecting the notches. By forming the bent portion, a predetermined gap is formed on the back surface side of each blade portion.

According to a second aspect of the present invention, there is provided the scissors according to the first aspect of the present invention, wherein the connecting rotation shaft is provided with an interval holding member for holding a predetermined interval between the two blades. is there.

The scissors according to a third aspect of the present invention are the scissors according to the first or second aspect, wherein the predetermined angle is 10 to 15 °.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1A, a pair of scissors 11 includes a pair of left and right first blade bodies 12 a and a second blade body 12 b formed in substantially the same shape.
2a and 12b and a connecting rotation shaft 13 which functions as a center of rotation.

From the center to the tip of the first blade body 12a and the second blade body 12b, a blade part 21 formed in a substantially rectangular plate shape by a quenching material that can be pressed. At the base ends of these blades 12a and 12b, grip portions 22 made of synthetic resin are provided.
Are provided, and the scissors 11 can be rotated by inserting a thumb or forefinger into each grip portion 22.

As shown in FIGS. 1 (a) and 1 (b), a cutting blade 23 is provided on one side of the abdomen from the center to the tip of each blade 21 so as to face each other. The tips of the cutting blades 23 are slightly in sliding contact with each other. At the base ends of these cutting blades 23, there are provided abdominal cutouts 24 cut out in a substantially semicircular shape. Further, a back notch 25 cut in a substantially semicircular shape is provided at the back end of the blade 21.

A fold line 26 is formed between these notches 24 and 25 by bending each blade portion 21 at a small angle in a direction approaching each other, and the blade portion 21 on the tip side from the fold line 26 is folded. The bent portion 27 is formed. The fold line 26 is bent with the center of the abdominal notch 24 and the back notch 25 as an end. As shown in FIG. 1B, each bent portion 27 is formed by bending the distal end portions of the blade portions 21 along the folding line 26 in a direction approaching each other by a predetermined angle α, and as the distal end side becomes closer. It is formed so as to widen. By this bending, a minute gap d is formed inside the blade portion 21 that forms the back side of the back surface of each bent portion 27.

The predetermined angle α is preferably in the range of 10 to 15 °, and more preferably in the range of 10 to 13 °. If this angle α is less than 10 °, the gap d
Is narrowed, the adhesive of the adhesive tape may easily adhere to the back surface of the blade portion 21. On the other hand, when the angle exceeds 15 °, the cutting blades 23 are liable to be worn when the leading ends thereof slide against each other.

The angle β between the folding line 26 and the cutting blade 23 shown in FIG. 1A is preferably 2 to 12 °, more preferably 5.1 to 8 °. If the angle β is less than 2 °, the folding line 26 cannot be bent. Conversely, when the angle exceeds 12 °, the tip of the bent portion 27 is excessively protruded toward the opposing blade 21, and is not suitable as the scissors 11.

Further, the gap d is 0.15 to 0.3.
mm, more preferably 0.2 to 0.25 mm. If the gap d is less than 0.15 mm, the pressure-sensitive adhesive of the pressure-sensitive adhesive tape may easily adhere to the back surface of the blade 21. On the other hand, if it exceeds 0.3 mm, it becomes difficult to properly maintain the interval between the two blade portions 21, and the two cutting blades 23 are liable to be abraded when they come into sliding contact with each other.

Since the scissors 11 are easy to handle, the length of the blade 21 is 50 to 70 mm.
It is preferable to form it. At this time, the bent part 2
7 can be easily formed, so that the length of the bent portion 27 is preferably set to 40 to 55 mm.

As shown in FIG. 1A, the first blade body 12a
At the middle position between the abdominal notch 24 and the grip 22, an elongated insertion fixing hole 31 shown by a dotted line is provided. A circular insertion hole 32 indicated by a dotted line is provided at an intermediate position between the abdomen cutout portion 24 and the grip portion 22 of the second blade body 12b. These insertion fixing holes 31 and insertion holes 32
The base end of the blade portion 21 is formed wide by projecting the protrusion 33 at the back side base end of the blade, and the strength of the blade portion 21 is maintained high.

As shown in FIGS. 1 (a) and 3, the connecting rotary shaft 13 has a driver tool groove 34a formed on the upper surface of the head and a male screw 34b formed on the outer peripheral surface of the side. It is composed of a metal fixing bolt 34 and a resin nut 35 formed in a substantially cylindrical shape by synthetic resin.
Further, a metal fixed washer 36 fixed between the head of the fixing bolt 34 and the first blade body 12a, the first blade body 12a and the second blade body 12b And a resin washer 37 made of a synthetic resin as a space holding member for maintaining the space between the resin washer and the space between them.

The upper and lower surfaces of the resin washer 37 are both smooth surfaces, so that friction between the upper and lower surfaces of the blades 12a and 12b hardly occurs. The thickness of the resin washer 37 is preferably 0.3 to 0.6 mm, more preferably 0.4 to 0.5 mm. If the thickness is less than 0.3 mm, the gap d becomes narrower, so that the adhesive of the adhesive tape may easily adhere to the back surface of the blade portion 21. On the other hand, if it exceeds 0.6 mm, it becomes difficult to properly maintain the interval between the two blade portions 21, and the two cutting blades 23 are liable to be abraded when they come into sliding contact with each other.

As shown in FIGS. 2 (a) to 2 (d), a circular fixing hole 41 is vertically provided at the center of the resin nut 35, and the fixing bolt 34 is fixed (screwed). It can be made to be. Also, this resin nut 3
A locking portion 42 for locking the second blade body 12b is formed at a lower end portion of the fifth blade 5 in a substantially bowl shape. An engagement groove 43 for engaging with a square or hexagon wrench is formed in the lower end of the locking portion 42.

The insertion hole 3 is located above the locking portion 42.
2 and a rotation shaft portion 44 which is inserted into the insertion fixing hole 31 and functions as a rotation center of the second blade body 12b. The height of the rotation shaft portion 44 is formed to be substantially the same as the length obtained by adding the thickness of the two blade portions 21 and the resin washer 37. At the upper end of the rotating shaft portion 44, a fixing groove 45 for engaging the inside of the insertion fixing hole 31 and fixing the resin nut 35 to the first blade body 12a is formed. The fixing groove 45 is formed with a depth substantially equal to the thickness of the blade portion 21 of the first blade body 12a.

The operation of the scissors 11 will be described below. When the scissors 11 are manufactured, first, it is preferable that the bent portions 27 be easily formed.
mm or less using a press hardenable material with a thickness of
Each blade part 2 constituting the first blade body 12a and the second blade body 12b
1 is press-punched. At this time, each blade 21
The notches 24 and 25 are formed at the same time. Subsequently, a cutting edge 23 is formed by press-punching one inner edge of each blade portion 21 in an oblique direction. Next, after forming a fold line 26 by press-bending a predetermined angle between the abdominal cutout portion 24 and the back cutout portion 25 formed in each blade portion 21, the fold line 26 is formed in advance by an injection molding method. Gripping part 22
Is fixed to the base end of each blade portion 21, and each blade body 12a, 12b
To complete.

Next, as shown in FIG.
After the turning shaft 44 is inserted into the insertion hole 32 of the second blade body 12b to bring the surface of the second blade 12b into close contact with the upper surface of the locking portion 42, the resin washer 37 is moved to the turning shaft 44. To make close contact with the back surface of the second blade body 12b. Subsequently, after the fixing groove 45 of the resin nut 35 is engaged with the insertion fixing hole 31 of the first blade body 12a, the engaging groove 43 of the resin nut 35 is clamped and fixed by a square wrench or a hexagon wrench. The fixing bolt 34 into which the fixing washer 36 is inserted is screwed into the fixing hole 41 of the resin nut 35. At this time, the fixing holes 41 made of synthetic resin are fixed to the metal fixing bolts 3.
By the screw advance of 4, the female screw to be screwed with the male screw 34b is screwed, and the fixing bolt 34 is stopped and locked.

When cutting paper, cloth, or the like using the scissors 11, the cutting can be performed in exactly the same manner as ordinary scissors. On the other hand, when using the scissors 11 to cut an adhesive tape having an adhesive applied to one or both surfaces, the cut surface of the cut adhesive tape and the back surface of each blade portion 21 are separated by the gap d or the gap d. Since they are arranged at the following slight intervals, the adhesive adhered near the cut surface is not easily adhered to the back surface of each blade portion 21. Further, even if the adhesive is adhered to the back surface of the blade portion 21, since the back surfaces of the two blade portions 21 are configured to be hardly in sliding contact with each other, the adhesive is pushed and spread on the back surface of the both blade portions 21. As a result, the rotation operability and cutting performance of the scissors 11 are hardly reduced.

The effects exerted by the above embodiment will be described below. The scissors 11 are provided with an abdominal notch 24 and a back notch 25 at the base end of each cutting blade 23 and at the back of the distal end of each blade 21, and the notches 24, 25 are provided.
A predetermined gap d is formed on the back side of each blade portion 21 by forming a bent portion 27 in which the tip end of each blade portion 21 is bent at a predetermined angle on the side of the facing blade portion 21 by a fold line 26 connecting them. It is formed. For this reason, by providing the abdominal cutout portion 24 and the back cutout portion 25, both ends of the fold line 26 can be easily defined, so that the fold line 26 can be bent very easily. it can. Therefore, the bent portion 2 provided to prevent the adhesive of the adhesive tape from adhering to the blades 12 a and 12 b (the blade 21) of the scissors 11.
7 can be easily formed.

Further, the strength of the blade portion 21 itself can be increased by forming the fold line 26 on each blade portion 21 and providing the bent portion 27. Therefore, the blade portion 21 is made of a thin material which is easy to press work. Can be configured.
Therefore, according to this configuration, the scissors 1 having high strength are provided.
1 can be manufactured very easily. Further, the blade portion 21 extends from the center of the abdominal notch 24 and the back notch 25.
Is bent, it is easy to uniformly fold the entire fold line 26 (particularly, both ends of the fold line 26) at the same angle.

On the other hand, when cutting a thick object such as a corrugated cardboard using the scissors 11, both cut surfaces of the object are hard to press the two blade portions 21 of the scissors 11. . That is, since the gap d formed on the back surfaces of the two blade portions 21 allows the cut surface to protrude to a certain extent, it is possible to prevent the protruded cut surface from pressing the blade portion 21. Therefore, scissors 1
1 can be effectively prevented from being oriented in an oblique direction, so that it is easy to continuously cut a thick object to be cut for a long distance, and the upper and lower surfaces of the object to be cut are It is easy to form both cut surfaces vertically.

Provision of the resin washer 37 on the connecting rotation shaft 13 makes it possible to easily hold the blades 12a and 12b at a predetermined interval (a constant interval). For this reason, by making the interval between the both blade portions 21 constant, the tips of the cutting blades 23 can always be brought into proper sliding contact with each other, so that the cutting performance of the scissors 11 can be kept high. Further, the resin washer 37 is made of synthetic resin, and the upper and lower surfaces thereof are smoothed, so that the turning operation of the blade bodies 12a and 12b can be performed smoothly, and the insertion fixing holes 31 and the insertion holes 32 can be formed. Wear of the back surface of the nearby blade portion 21 can be effectively prevented.

The bending angle α of the fold line 26 is 10 to 1
By setting the angle to 5 °, it is possible to effectively prevent the adhesive of the adhesive tape from adhering to the back surface of the blade portion 21 while suppressing the wear of the cutting blade 23 and maintaining the cutting performance of the scissors 11 high. it can.

The present embodiment can be embodied with the following modifications. -Notches 24, 25 as shown in FIG.
To form a triangle. Further, since the fold line 26 is more easily formed, it is preferable that the fold line 26 is formed so that the edge on the distal end side of the abdominal notch 24 is orthogonal to the fold line 26. Similarly, it is preferable that the fold line 26 is formed so that the base edge of the back notch 25 is orthogonal to the folding line 26.

As shown in FIG. 4B, the notches 24 and 25 are formed in a square shape. -Notches 24, 25 as shown in FIG.
At least one end is formed in a rounded shape. With such a configuration, the notches 24 and 25 are less likely to be caught by a protruding object or the like, so that the handleability of the scissors 11 can be improved.

As shown in FIG. 4D, the abdomen notch 24 is formed by notching a predetermined width from the base end of the cutting blade 23 to the base end of the blade portion 21. At this time, it is preferable that one end of the folding line 26 is provided at the center of the step 51a provided at the tip of the abdomen notch 24. Further, it is more preferable that the edge of the step portion 51a and the folding line 26 are formed to be orthogonal to each other.

Alternatively, the back notch 25 is formed by notching a predetermined width from the base end of one back side edge of the bent portion 27 to the front end. At this time, one end of the folding line 26 is connected to the step 5 provided at the base end of the back notch 25.
It is preferably provided at the center of 1b. further,
It is more preferable that the edge of the step portion 51b and the folding line 26 are formed to be orthogonal to each other.

In the case of such a structure, the abdominal notch 2
4 or the back notch 25 is less likely to be caught by a protrusion or the like, so that the handling of the scissors 11 can be improved.

The fixing hole 41 is formed at a predetermined depth from the upper end to the center of the resin nut 35 to close the lower end of the locking portion 42. Further, technical ideas that can be grasped from the embodiment will be described below.

(1) The scissors according to any one of claims 1 to 3, wherein an end of the folding line is provided at a center of the notch. With this configuration, the bent portion can be formed more easily.

(2) The scissors according to any one of (1) to (3) and (1), wherein the folding line is formed so as to be orthogonal to an edge of the notch. With such a configuration, the bent portion can be formed more easily.

(3) The base end of the blade around the connecting rotation shaft is formed wide.
And the scissors according to any one of the above (2). With this configuration, the strength of the blade can be easily increased.

(4) The scissors according to any one of (1) to (3) and (1) to (3), wherein the angle between the cutting blade and the folding line is formed to be 2 to 12 °. With such a configuration, the folding line can be easily formed.

(5) The connecting rotary shaft is constituted by a metal fixing bolt and a synthetic resin resin nut having a circular fixing hole formed in the center thereof. The scissors according to any one of (1) to (4). With this configuration, the connecting rotation shaft can be easily attached.

[0042]

As described above in detail, according to the present invention, the following effects can be obtained. According to the scissors of the first aspect of the present invention, it is possible to easily form a bent portion provided to make it difficult for the adhesive of the adhesive tape to adhere to the blade of the scissors.

According to the scissors of the invention described in claim 2,
In addition to the effects of the first aspect, the distance between the two blades can be easily maintained. According to the scissors of the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, while maintaining the cutting performance of scissors high,
The adhesive of the adhesive tape can be effectively prevented from adhering to the blade.

[Brief description of the drawings]

FIG. 1A is a plan view showing a scissor according to an embodiment,
(B) is an end view which shows the scissors seen from the 1b-1b line of FIG. 1 (a).

2A is a plan view showing the resin nut of the embodiment, FIG. 2B is a front view thereof, FIG.
(D) is a bottom view.

FIG. 3 is a partially enlarged end view showing the scissors as seen from line 3-3 in FIG. 1 (a).

FIGS. 4A to 4D are plan views each showing a part of scissors other than the embodiment.

[Explanation of symbols]

11: scissors, 12a: first blade as a blade, 12b
... Second blade body as blade body, 13 ... Connecting rotation shaft, 21 ... Blade part, 22 ... Grip part, 23 ... Cutting blade, 24 ... Abdominal notch part as notch part, 25 ... Notch part Notch, 26 ... fold line, 27 ... bend, 37 ... resin washer as spacing member, α ... predetermined angle, d ... gap.

Claims (3)

[Claims] 1. A blade portion provided with a cutting blade on one side edge on the abdominal side, and a pair of blade bodies provided with a grip portion at a base end of the blade portion, and between the cutting blade and the grip portion. A scissors provided with a connecting and rotating shaft for connecting and rotating the two blades, wherein a notch is provided at a base end of each of the cutting blades and at a position behind the distal end of each of the blades. A predetermined gap is formed on the back side of each blade by forming a bent portion by bending the tip end of each blade at a predetermined angle on the opposite blade body side with a fold line connecting the notches. Scissors. 2. The scissors according to claim 1, wherein the connecting rotation shaft is provided with an interval holding member for holding the two blade bodies at a predetermined interval. 3. The scissors according to claim 1, wherein the predetermined angle is 10 to 15 °.