JPH0520119B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a paper knife having a guide function suitable for tearing a piece of paper folded in half, a sealed portion of an envelope, etc. along the fold line. .

<Prior art> Generally, scissors or a knife are used to open an envelope, but opening with the former involves cutting out a narrow section along one side of the envelope, which is very cumbersome and also destroys the contents. There is a risk that it may be severed. In addition, the latter method is not only extremely dangerous as it requires a sharp object, but there is no guarantee that the seal can always be opened along the crease, and furthermore, the knife inserted into the seal may cut the seal. It is easy to escape from the sealing part, and if this happens, there is the trouble of having to reinsert the knife into the sealing part.

<Problems to be Solved by the Invention> Therefore, an object of the present invention is to safely and continuously tear apart the creases of a piece of paper folded in half or the sealing part of an envelope along its ridgeline. An object of the present invention is to provide a paper knife with a guide function that allows

<Means for Solving the Problems> In the present invention, a groove is formed in one end of a base that also serves as a handle, and an arm that protrudes from the base through the groove to the outside of the base without contacting the groove. It has a neck area for setting a paper strip passage having a substantially V or U-shaped cross section between the groove and the groove, and a spatula-shaped guide area,
A knife edge provided in the base that can be viewed through the paper passage is obliquely provided with a front height and a rear low position with respect to the bottom of the paper passage.

In addition, if a crease pushing protrusion is formed in the guide area of the arm, extending from the spatula-shaped tip side toward the neck area side and partially blocking the front of the knife edge, the pushing function of the protrusion allows It is possible to reliably feed the fold or ridgeline portion of the paper strip to a narrow position at the bottom of the paper strip path.

In addition, by forming the tip of the arm from the neck area to the guide area in a square shape, and freely selecting the oblique angle of the guide area when inserting the paper into the fold of the piece of paper during cutting, the contents can be seen all the way to the sealing area. It can be used to open envelopes that are inconveniently packed with items, and to tear wrapping paper, etc., which requires accurate straight cutting.

In addition, by forming a through hole from one side of the base through a groove to the other side of the base so that the main part of the knife edge can be seen from outside the base, it is possible to prevent fine dust and paper scraps from adhering to the knife edge and hindering cutting. , can be detected very easily and quickly eliminated.

<Function> In order to open an envelope using the paper knife configured as described above, it is sufficient to simply insert the spatula-shaped tip of the guide region into one end of the envelope sealing part and move it to the other end. As a result of this movement, the envelope sealing part that has entered the paper path is torn by the knife edge of the knife. Therefore, the guide area serves as a spatula to find one end of the envelope sealing part, and also to separate the envelope along the fold. It plays the role of a guide for feeding along the small blade side. However, since the guiding role is mainly achieved at the tip of the arm remote from the knife edge, in order to obtain a cutting effect along the crease, the straight line connecting the tip edge and the knife edge should be oriented along the crease. There is a need. This orientation is forcibly achieved by a gap-shaped paper path having a U-shaped cross section formed by a concave groove formed at one end of the base and the neck region of the arm. Since the paper pieces passing through this paper piece path are positioned from the left and right and up and down directions, the cutting effect can always be obtained along the fold line even if the paper pieces are operated casually.
In addition, since the guide area establishes a passage for the paper strip between the groove and the groove, it does not have a sharp knife edge, so it is not dangerous to touch it, and it will not tear the paper piece during the cutting process. Continuous cutting is possible without escaping from the seal or fold, and the stop function of the groove prevents the knife edge from penetrating deeply into the envelope, thereby damaging the contents of the envelope. Never.

The paper knife according to the present invention is not only capable of accurately and continuously cutting the sealed portion of an envelope or a piece of paper folded in half along its ridge line, but also can cut the folds on its own for pieces of paper that do not have creases. It also has the effect of attaching. That is, when a piece of paper without a crease is picked up in a loop shape at a desired point, and the guide area is inserted and pushed forward, the pieces of paper that enter the paper piece path are sequentially folded in half, and then continuously folded with a knife edge. Being torn apart.

In this way, the guide region and the paper strip path not only play the role of guiding the paper strip as it advances toward the knife edge side while supporting it with the folded portion, but also serve to create a crease on the paper strip without a crease. The piece of paper, which is supported by the fold and its horizontal wobbling is controlled, advances without bending even when it reaches the knife edge, and is torn in a straight line at the ridge of the fold.

<Examples> Next, the present invention will be explained along with examples shown in the drawings.

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a partially sectional side view,
Figure 3 is a plan view, Figure 4 is an enlarged sectional view taken along line B-B in Figure 3, and the position of line A-A in Figure 2 is B in Figure 3.
- Same position as B.

As is clear from FIG. 1, the base body 2, which also serves as the handle of the paper knife 1, has a groove 3 at one end thereof, and the base body 2 can be passed from the base body 2 through the groove 3 without contacting the base body 2. As is clear from FIG. 2, the arm 4 protruding outward has a neck region 5 on its distal end side and a spatula-shaped guide region 6 continuously continuous from the neck region 5. The knife edge 8 of the knife 7 installed obliquely in the lower part 9 of the groove 3
The posture is high in the front and low in the back. FIG. 4 is an enlarged sectional view taken along the line B-B in FIG.
It has a paper passageway 10 having a substantially V-shaped cross section, that is, narrow at the bottom and wide at the top, between the side wall of the
As is clear from FIG. 3, the width of the plane of the paper passage is wide on the guide area side, that is, on the opening side of the tip, and narrow on the opposite side. In addition,
The position of the line BB in FIG. 3 is the same as the position of the line AA in FIG. 2.

FIG. 5 is for explaining the procedure for opening the envelope 11 using the paper knife 1 configured as described above. First, the spatula-shaped tip of the guide area 6 is inserted into one end of the envelope sealing part. When this is pushed in the direction of the arrow shown in the figure, the envelope sealing part enters the paper strip passage 10 and is subjected to a position regulating action, and is torn by the knife edge 8 located in the same passage. In the process, the guide region 6 does not escape from the sealing part,
Can be torn apart continuously.

FIG. 6 is a partially sectional side view showing another embodiment of the present invention, in which the arm 12 of the paper knife 1 is
Unlike the arm 4 shown in FIG. 2, it has a crease pushing projection 15 that extends from the spatula-shaped tip side of the guide region 13 toward the neck region 14 and partially blocks the front of the knife edge 8. The function of the push-in protrusion 15 is as follows.

That is, the guide area 13 of the arm 12 is inserted into one end of the fold of a piece of paper folded in half,
When the paper pieces are moved to the other end side, the paper pieces that have entered the paper piece passage 10 due to this movement will be prevented from twisting, sideways movement, lifting, etc. of the folds due to the function of the pushing protrusion 15 that guides the folds from the inside. The ridgeline is guided to the narrow bottom of the paper path and advances along the E-E line shown in the drawing without causing any inconvenience, making it especially suitable for cutting straight pieces such as large wrapping paper that require precise cutting. can be carried out extremely easily and without any problems.

FIG. 7 is also a partially sectional side view showing another embodiment of the present invention, and the tip of the arm 16 of this embodiment is the same as the arm 4 shown in FIG. 2 and the arm shown in FIG. 6. 12, it is bent from the neck region 17 to the guide region 18 in an F-shape.

That is, the feature of this paper knife according to this embodiment is that when the tip of the bent arm 16 is inserted into the fold of a piece of paper, the angle of insertion is changed, thereby making it possible to cut packaging that requires accurate straight cutting. It is possible to selectively and easily cut objects with contradictory conditions, such as tearing large sheets of paper, and opening inconvenient envelopes that are filled to the seal. .

FIGS. 8 and 9 show how to tear a piece of paper 19 and an envelope 20 using the paper knife of this embodiment.
This shows how to open the package.

FIG. 8 shows the procedure for tearing the fold of a piece of paper 19 folded in half, and the linear neck area 17 of the arm 16 inserted into the fold is at an angle almost parallel to the fold line, that is, the ridge line of the piece of paper 19. When the guide region 18 is inserted into the paper strip 19 and moved to the other end at the same angle, the tip of the guide region 18 bent from the neck region 17 in an F-shape pushes the fold of the paper strip 19 from the inside and pushes the ridgeline of the paper strip 19 from the inside. paper passageway 1
0, that is, the crease guiding protrusion 21 that feeds the line along the line F-F in FIG. to carry out the cutting.

FIG. 9 also uses the paper knife to remove the envelope 20.
The insertion angle of the arm 16 inserted into one end of the sealing part in Fig. 9 is the same as the angle of the arm 16 inserted into the piece of paper 19 in Fig. 8. , the spatula-shaped linear portion of the guide region 18 is inserted approximately parallel to the ridgeline of the sealing portion of the envelope 20, and the ridgeline portion that enters the paper path as it moves is
Passing on the G-G line shown in Figure 7, the knife edge 8
If you touch it, you will be torn to pieces. In addition, envelope 20
The reason and advantage of setting the guide area 18 to be inserted into the sealing part of the envelope at the above-mentioned insertion angle depends on the condition of the envelope to be cut. This is to avoid the inconvenience that when opening the envelope, the thick sealing part gets stuck in the narrow bottom of the paper path and becomes impossible to cut.

That is, the width of the paper strip passage portion through which the G-G line passes is a wide portion from the entrance side of the groove to the upper part of the paper strip passage with a V-shaped cross section. If the sealing part is cut at an angle that passes on line G, that is, at an insertion angle of the guide region 18 shown in FIG. 9, even if the envelope is thickly packed,
There is no fear that the paper strips will get stuck in the path and become impossible to cut, so they can be opened quickly and without any trouble.

When tearing a piece of paper, fine chips and dirt may adhere to the knife edge, making it impossible to cut.One way to remove this dirt is to use an arm as shown in 4
By forming a support shaft 22 at the base of the arm 4 and flipping up the tip of the arm 4 to the position shown by the two-dot chain line, dirt adhering to the blade can be easily removed.

Note that FIGS. 10 and 11 also show embodiments for quickly discovering and removing inconvenient dirt adhering to the knife edge 8, and embodiments of the means, structure, etc. This is realized by the paper knife shown in the embodiment of FIG.

That is, in the side surface of the base body 2 shown in FIG. 10, a through hole 23 through which the main part of the knife edge 8 can be viewed from outside the base body is formed to penetrate from one side surface to the other side side through a groove. Dirt such as fine paper waste adhering to the vicinity can be removed through this through hole 2.
3, it can be easily detected, and it can be quickly removed by blowing on it forcefully.

FIG. 11 is a partially cutaway enlarged side view of FIG. 10, showing the end of the bottom 9 of the paper path 10 on the knife 7 side and the knife edge 8 facing this.
Since a slight gap, that is, a gap 24 is formed between the edges, when the fold of the paper that has entered the paper strip path crosses the bottom 9 and abuts the knife edge 8, the tip of the ridge line The deformation of the folds that occurs is extremely effectively prevented, and cutting without cutting defects can be efficiently performed, but during this time, the formation of the bottom portion 24 automatically removes fine dust, chips, etc. that have adhered to the knife edge 8. made it possible. In other words, even if fine dust or the like adheres to the knife edge and causes poor cutting, the dirt is automatically pushed out by the paper that subsequently enters for cutting, and passes through the gap 24 to the knife edge. 8, falls into the through hole 23, and is quickly removed.

Although the through hole 23 was formed in the above embodiment, it is not limited to a circular shape, but may be square, triangular, or the like.

Further, it goes without saying that the formation of the through hole 23 and the gap 24 is not limited to the paper knife shown in FIG. 6 cited in the embodiment.

Note that there are a through hole 23 and a gap 2 in the same paper knife.
4 is preferable, but only one of them may be provided.

<Effects of the Invention> As described above, the present invention provides a paper knife that can easily, safely, and efficiently accomplish the task of opening an envelope or tearing a piece of paper folded in half along the fold lines. In particular, its guiding function not only provides a positioning effect on the piece of paper just before it is fed into the knife edge, but also prevents the knife blade from damaging the contents of the envelope; In addition, it prevents the knife blade from escaping from the cutting part and acts like a spatula.The groove also has a stop function that straddles the folds of the envelope and prevents the knife blade from penetrating deeply into the envelope. , has a clamping function that prevents the crease from spreading and allows accurate cutting without bending.In particular, the clamping function is
Excellent practical effects, such as the ability to easily cut straight lines by creating folds on uncreased pieces of paper sent into the groove and introducing them into the paper passage. has.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a partially sectional side view,
FIG. 3 is a plan view, FIG. 4 is an enlarged sectional view taken along the line B--B in FIG. 3, and FIG. 5 shows how to tear the sealed portion of an envelope using the paper knife of the above embodiment. FIG. 6 is a partially sectional side view showing another embodiment of the invention, FIG. 7 is a partially sectional side view showing another embodiment of the invention, and FIGS.
The figure shows how to use it. Also the 10th
The figure is also a side view showing another embodiment of the present invention, and FIG. 11 is also a partially cutaway enlarged side view showing the embodiment. DESCRIPTION OF SYMBOLS 1... Paper knife, 2... Base body, 3... Concave groove, 4... Arm, 5... Network area, 6... Guide area, 7... Short knife, 8... Knife edge, 9
...Bottom, 10...Paper passage, 11...Envelope, 1
2...Arm, 13...Guide area, 14...Neck area, 15...Pushing protrusion, 16...Arm, 17...Neck area, 18...Guide area,
19... Piece of paper, 20... Envelope, 21... Guide protrusion, 22... Support shaft, 23... Through hole, 24... Between
Department.

Claims (1)

[Scope of Claims] 1. A base body that also serves as a handle has a groove at one end thereof, and an arm that projects from the base body through the groove to the outside of the base body has a cross section of approximately A knife edge provided obliquely within the base and having a neck area for setting a V- or U-shaped paper passage and a spatula-shaped guide area, and which is viewed through the paper passage, is located at the bottom of the paper passage. A paper knife characterized by its front-high and rear-low posture. 2. Claim 1, wherein the width of the paper passage is wide on the guide area side and narrow on the opposite side.
Paper knife described in. 3. The paper knife according to claim 1 or 2, wherein the neck area has a crease pushing protrusion that partially blocks the front side of the knife edge. 4. The paper knife according to claim 1 or 2, wherein the tip of the arm formed in an F-shape from the neck area to the guide area serves as a crease guiding protrusion. 5. A through hole through which the main part of the knife edge can be viewed from the side is formed from one side of the base through the groove to the other side. Paper knife described in.