JP2017086449A - Cutter blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter blade capable of suppressing inadvertent scratching of a work object or the like with an edge tip or a side edge tip on the opposite side after being removed at a folding groove and also improving work safety.SOLUTION: A tabular cutter blade 1 extending in a belt-like shape has a plurality of folding grooves 2 formed at intervals from each other in the extending direction, and a blade edge portion 3 extending in a thin belt-like shape and having a blade edge 3a on a side edge on one side. The folding grooves 2 extend in a convex curve at least from the blade edge portion 3 to a side edge on the other side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutter blade used for a so-called folding blade type cutter capable of forming a new blade by breaking a blade piece with a folding groove.

Conventionally, a cutter blade used for a folding blade type cutter is, for example, as shown in Patent Document 1, when the blade is worn and deteriorated as it is used. However, it is possible to easily form a new blade.
As shown in FIG. 3, a conventional cutter blade 100 for a general folding blade type cutter has a fold groove 102 formed in a slanting straight line inclined at, for example, 60 ° with respect to the blade edge 103 a of the blade edge portion 103. By cutting the folding groove 102 at a folding angle of 60 °, it is possible to obtain the cutting edge 103a protruding at an acute angle at the tip.

JP-A-9-75560

The following problems remain in the conventional technology.
In the conventional cutter blade 100, the folding groove 102 set at a folding angle of 60 ° or the like is formed in a straight line. However, when the folding blade 102 is folded, the tip edge 103a protrudes at an acute angle. That is, the conventional cutter blade 100 is suitable for work that requires an act of piercing a work object such as cardboard, such as packing dismantling or opening work, but the work object is inadvertently formed by an acute edge tip. There is a problem that the safety of workers and the like is low. In addition, since the tip of the side edge on the opposite side of the blade edge 103a is also a corner, there is a risk that the work object will be inadvertently damaged, and the work safety of the operator and the like will be reduced.

  The present invention has been made in view of the above-described problems, and it is possible to suppress inadvertently damaging a work object or the like at the tip of the blade edge or the side edge tip on the opposite side when folded by the folding groove. And it aims at providing the cutter blade which can improve work safety.

  The present invention employs the following configuration in order to solve the above problems. That is, the cutter blade according to the first invention is a plate-like cutter blade extending in a strip shape, and a plurality of folding grooves formed at intervals in the extending direction and one side edge And a cutting edge portion extending in a narrow band shape with a cutting edge, and the folding groove extends in a convex curve shape from at least the cutting edge portion to the other side edge.

  In the cutter blade of the present invention, it extends in a convex curve shape from at least the blade edge portion to the other side edge, so that the tip of the blade edge has an acute angle as compared with the case where the blade piece is folded with a conventional oblique linear fold groove. In addition, the other side edge tip also has a curved shape that is chamfered in a curved shape. Therefore, it is possible to prevent the work object and the like from being inadvertently damaged at the tip of the blade tip when the blade piece is broken by the fold groove or the side edge tip on the opposite side, and to improve work safety. be able to. Moreover, since the front end side edge when it folds in a fold groove becomes a convex curve shape, it is also possible to use a front end side edge as a scraper.

The cutter blade according to a second invention is characterized in that, in the first invention, one end portion of the fold groove located in the vicinity of the blade edge is arranged on the most distal end side.
That is, in this cutter blade, one end portion located in the vicinity of the blade edge in the fold groove is arranged on the most distal end side, so that the blade edge tip is positioned at the forefront of the cutter blade, so that the work tip is attached to the work object. Workability is improved with easy tip contact.

In the cutter blade according to the third invention, in the second invention, one end portion of the fold groove located near the blade edge is formed at 90 ° with respect to the extending direction of the blade edge. Features.
That is, in this cutter blade, one end portion of the fold groove located in the vicinity of the cutting edge is formed at 90 ° with respect to the extending direction of the cutting edge. Therefore, there is no piercing ability in the direction reverse to the extending direction of the blade edge, and it has high safety. Further, when the folding groove extends at an acute angle with respect to the extending direction of the blade edge, the starting point of the folding also becomes sharp and difficult to fold. By doing so, it becomes easy to fold the vicinity of the blade edge as the folding start point. Furthermore, the tip strength of the blade tip is improved by making the tip of the blade tip obtuse.

A cutter blade according to a fourth invention is characterized in that, in any one of the first to third inventions, a portion of the folding groove formed at the blade edge portion is also formed in a convex curve shape. .
That is, in this cutter blade, the part formed in the cutting edge portion of the folding groove is also formed in a convex curve shape, so the fracture surface of the tip of the cutting edge portion when folded in the folding groove also has a convex curved surface shape. The tip of the part can also be blunted.

A cutter blade according to a fifth invention is characterized in that, in any one of the first to fourth inventions, the other end portion of the folding groove reaches a notch portion formed in the other side edge. To do.
In other words, in this cutter blade, the other end of the fold groove reaches the notch formed on the other side edge, so that the cut surface is cut off from the fold groove and easily cuts to the side that is easy to break. Can be prevented from occurring near the other end of the folding groove.

The present invention has the following effects.
That is, according to the cutter blade according to the present invention, since it extends in a convex curve shape from at least the blade edge portion to the other side edge, it is possible to suppress inadvertently damaging the work object and the like. , Work safety can be improved.

It is a top view which shows one Embodiment of the cutter blade which concerns on this invention. In this embodiment, it is an enlarged plan view which shows the front-end | tip part of a cutter blade. It is a top view which shows the prior art example of the cutter blade which concerns on this invention.

  Hereinafter, an embodiment of a cutter blade according to the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the cutter blade 1 of this embodiment is used in a so-called folding blade type cutter capable of forming a new blade by breaking a blade piece with a folding groove 2 and extends in a belt shape. A plate-like cutter blade, which has a plurality of folding grooves 2 formed at intervals in the extending direction and a blade edge 3a on one side edge (so-called side edge on the blade side) and has a narrow band shape And a cutting edge portion 3 extending in the direction.
The folding groove 2 extends in a convex curve shape from at least the blade edge 3 to the other side edge (so-called back side edge).
In this embodiment, the part formed in the blade edge | tip part 3 among the folding grooves 2 is also made into the convex curve shape.

Moreover, the one end part located in the vicinity of the blade edge | tip 3a among the folding grooves 2 is distribute | arranged to the most front end side.
Further, one end of the folding groove 2 located in the vicinity of the cutting edge 3a is formed at 90 ° with respect to the extending direction of the cutting edge 3a.
Further, the other end portion of the folding groove 2 reaches the other side edge. Note that the other end portion of the folding groove 2 reaches a V-shaped cutout portion 1c formed on the other side edge.
The folding groove 2 is formed in a V-shaped cross section like a conventional cutter blade.

The folding groove 2 has an arcuate curved shape that is convex toward the tip side.
For example, the folding groove 2 extends in an arc shape of R50 mm.
Each folding groove 2 is formed at a certain interval in the extending direction of the cutter blade 1.
An engagement hole 4 is formed at the base end of the cutter blade 1. This engagement hole 4 is a hole for attaching and fixing the cutter blade 1 to the cutter body, and a protrusion of a slider installed in the cutter body can be inserted.

  As described above, the cutter blade 1 of the present embodiment extends in a convex curve shape from at least the blade edge portion 3 to the other side edge, and therefore, compared with a case where the blade piece is folded by a conventional oblique linear folding groove. Thus, the blade tip 3b does not have an acute angle, and the other side edge tip 1b has a curved shape that is chamfered in a curved shape. Therefore, it is possible to prevent the work tip and the like from being inadvertently damaged at the blade tip 3b when the blade piece is folded by the fold groove 2 or the other side edge tip 1b on the opposite side. Safety can be improved.

In particular, since the portion formed in the blade edge portion 3 of the folding groove 2 is also formed in a convex curve shape, the fracture surface at the tip of the blade edge portion 3 when folded in the folding groove 2 also has a convex curved surface shape. Three blunts can also be blunted.
Moreover, since the front end side edge 1a when bent by the folding groove 2 has a convex curve shape, the front end side edge 1a can be used as a scraper.

Moreover, since the one end part located in the vicinity of the blade edge | tip 3a among the fold grooves 2 is distribute | arranged to the most front end side, when the blade edge | tip front edge | tip 3b is located in the forefront of the cutter blade 1, a blade edge | tip front-end | tip is a work object. It is easy to apply 3b and workability is improved.
Further, since one end portion of the fold groove 2 located in the vicinity of the cutting edge 3a is formed at 90 ° with respect to the extending direction of the cutting edge 3a, the tip can be blunted and is in a direction toward the cutting edge tip 3b. Thus, there is no piercing ability in the direction (in the direction of the arrow in FIG. 1) that runs in the direction in which the cutting edge 3a extends, and the safety is high.

  Furthermore, if the folding groove extends at an acute angle with respect to the extending direction of the blade edge, the starting point of the folding also becomes sharp and difficult to fold, but in this embodiment, the folding groove 2 is near the cutting edge 3a with respect to the cutting edge 3a. By being 90 degrees, it becomes easy to fold the vicinity of the blade edge 3a as a folding start point. Furthermore, the tip strength of the blade tip 3a is also improved by making the tip of the blade tip 3a obtuse.

  In addition, since the other end portion of the folding groove 2 reaches the cutout portion 1c formed on the other side edge, the cut surface is short-cut to the direction that is easy to break off the folding groove 2, and the projection-like folding is performed. Generation | occurrence | production of the remainder in the other end part vicinity of the folding groove | channel 2 can be suppressed. In particular, when the angle between the folding groove 2 and the other side edge is 30 ° or less, the above-mentioned shortcut is likely to occur. Therefore, when the angle between the folding groove 2 and the other side edge is reduced to 30 ° or less, a notch It is preferable to provide the part 1c.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, as described above, it is preferable that one end portion of the folding groove 2 located in the vicinity of the blade edge 3a is formed at 90 ° with respect to the extending direction of the blade edge 3a. I do not care. In this case, since the tip shape of the blade edge 3a becomes sharper as the angle is smaller than 90 °, it is preferable to set the angle as close to 90 ° as possible.

  DESCRIPTION OF SYMBOLS 1,100 ... Cutter blade, 2,102 ... Folding groove, 3,103 ... Blade edge part, 3a, 103a ... Blade edge

Claims (5)

A plate-like cutter blade extending in a band shape,
A plurality of folded grooves formed at intervals in the extending direction;
Having a cutting edge on one side edge and extending in a strip shape,
The cutter blade, wherein the folding groove extends in a convex curve shape from at least the blade edge portion to the other side edge. In the cutter blade according to claim 1,
The cutter blade according to claim 1, wherein one end portion of the fold groove located in the vicinity of the cutting edge is arranged on the most distal end side. In the cutter blade according to claim 2,
The cutter blade, wherein one end portion of the fold groove located near the blade edge is formed at 90 ° with respect to the extending direction of the blade edge. In the cutter blade according to any one of claims 1 to 3,
The part formed in the said blade edge part among the said folding grooves is also made into the convex curve shape, The cutter blade characterized by the above-mentioned. In the cutter blade according to any one of claims 1 to 4,
The cutter blade, wherein the other end portion of the folding groove reaches a notch formed in the other side edge.

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