JP2503003Y2 - Knife for cutting wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a wire rod cutting knife, and more particularly to a wire rod cutting knife preferably used for a header.

[Prior Art] Conventionally, as a wire rod cutting knife used for a header, one having a structure shown in FIGS. 7 and 8 is known.

This wire cutting knife 1 includes a plate-shaped holder 2 and
A plate-shaped cutting piece 3 attached to the tip of the holder 2.
It consists of and.

At the tip of the holder 2, there is formed a recess 2a having substantially the same outer shape as that of the cutting piece 3 and having an opening toward the front. A screw hole 5 is formed along with.

A semi-circular cutting edge 3b is formed at the tip of the cutting piece 3 by cutting out with a curvature substantially the same as the outer diameter of the wire to be cut.

Then, the cutting piece 3 is inserted into the recess 2a of the holder 2, and the outer peripheral surface 3a thereof is recessed as shown in FIG.
It is fixed to the holder 2 by being opposed to the inner surface of 2a and being bonded between these opposing surfaces.

The wire rod cutting knife 1 thus configured is fixed to each cutting shaft 7 of the composite header 6 by the bolts 8 screwed into the screw holes 5, as shown in FIG. By being moved toward the quill 9 provided in front of the cutting shaft 7, the two kinds of wire rods W and W'intermittently fed from the quill 9 are cut by the cutting blade 3b.

Then, in cooperation with a clamp mechanism (not shown), the cut different kinds of wires W and W'are conveyed to the die 10 located between the quills 9 and inserted into the die 10 in a laminated state. It is supposed to do.

Further, the two wire rods W and W'inserted in the die 10
While being pressed into contact with the forming punch 11 arranged above the die 10, it is gradually formed into a predetermined shape as shown in FIG.

[Problems to be Solved by the Invention] Meanwhile, the above-described conventional wire rod cutting knife 1 has the following problems.

That is, since the cutting piece 3 is fixed to the holder 2 by roasting, if the cutting piece 3 is damaged or the like, the holder 2 must be replaced together, which is disadvantageous in terms of cost and the shape. It is a problem that the number of stocks that can be stocked is limited in terms of price.

Furthermore, when cutting the wire W into short pieces, it is necessary to use a thin cutting piece 3 accordingly. However, if the cutting piece 3 is thinned, the area of rolling between the cutting piece 3 and the holder 2 is reduced and the fixing strength is increased. It may decrease.

Therefore, conventionally, it has been desired to deal with these problems, and the present invention is to solve the problems that remain in the related art.

[Means for Solving the Problem] The present invention provides a wire rod cutting knife that can effectively solve the above-mentioned problems, and is a wire rod cutting knife for cutting a wire rod to a predetermined length. It consists of a flat plate-shaped holder and a disk-shaped cutting piece that is attached to the front part in the cutting direction of the holder. The cutting piece is inserted in the front part of the holder and opens on one side in the thickness direction. And a notch for exposing a part of the peripheral edge of the cutting piece to the outside is formed in a part of the peripheral wall of the recess, and the cut part is formed in the peripheral wall of the recess in the vicinity of both ends of the notch. By forming an engaging portion with which the periphery of the piece is engaged, and pressing the rear portion in the cutting direction of the cutting piece forward by the pressing member provided in the holder to engage with the engaging portion. , The piece is fixed to the holder And are characterized.

[Operation] In the wire rod cutting knife according to the present invention, the cutting piece is inserted into the recess of the holder, and the cutting piece is pressed by the pressing means to engage with the engaging portion formed on the peripheral wall of the recess. By doing so, the cutting piece is fixed to the holder.

Further, by releasing the pressing of the cutting piece by the pressing means, the engagement state between the cutting piece and the engaging portion is released, and the cutting piece can be removed from the recess.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on the figure.

In FIG. 1, reference numeral 20 indicates a wire rod cutting knife according to the present embodiment, which is composed of a flat plate-shaped holder 21 and a disc-shaped cutting piece 22 attached to a front portion of the holder 21 in the cutting direction.
At the front part of the holder 21, a recess 23 is formed which is opened on one side surface in the thickness direction and into which the cutting piece 22 is inserted.
A notch 24 that exposes a part of the peripheral edge of the cutting piece 22 to the outside is formed in a part of the peripheral wall 23a of the concave portion 23a.
In the vicinity of both ends of the cutout 24 of the peripheral wall 23a of the
2 has a schematic structure in which an engaging portion 25 with which the peripheral edge is engaged is formed, and a pressing member 26 that presses the cutting piece 22 to engage with the engaging portion 25 is provided in the holder 21.

Next, to explain these details, the holder 21 is formed in a substantially rectangular shape in plan view and has a predetermined thickness, and its tip portion (the left side in FIGS. 1 and 2).
Has been cut off in a tapered shape.

And, in this embodiment, the concave portion 23 formed at this tip portion is opened to the back surface side of the holder 21, and the dimension of the holder 21 in the longitudinal direction is larger than the diameter of the cutting piece 22. While being formed, a parallel portion 23b is formed at an intermediate portion in the length direction, and a widthwise interval of the parallel portion 23 is also formed larger than the diameter of the cutting piece 22.

Further, the notch 24 is formed on the tip end side of the holder 21, and the width of the notch 24 is the same as that of the cutting piece 22.
Is formed to have a diameter smaller than that of the recess 24 from the both end portions of the notch 24 to the middle portion in the longitudinal direction of the recess portion 23.
The peripheral wall 23a of 23 is formed continuously.

Therefore, the peripheral wall 23a of the recess 23 is gradually narrowed toward the tip of the holder 21, as shown in FIGS. 1 and 2, whereby the notch 24 is formed.
The engaging portions 25 are formed near both ends of the.

The engaging portions 25 are formed with substantially V-shaped engaging grooves 25a that open toward the inside of the recess 23, and the peripheral edge of the cutting piece 22 has a predetermined length in the circumferential direction. It is formed to be curved so as to have a curvature substantially the same as the curvature of the peripheral edge of the cutting piece 22 so as to be engaged.

As shown in FIGS. 1 and 4, the cutting piece 22 is formed in a disk shape in a plan view, and its peripheral edge is formed as an inclined surface 22a so that the cross-sectional shape becomes trapezoidal.

Further, semicircular cutting edges 22b are formed on the peripheral edge thereof at intervals of 180 ° in the circumferential direction.

Further, in the present embodiment, the pressing member 26 is provided on the holder 21 on the base end side (right side in FIGS. 1 and 2) of the recess 23 as shown in FIG.
And a press pin 28 inserted into each of the pair of through holes 27 formed so as to overlap with each other, and a hexagonal hole screwed to the press pin 28 and pulled in and fixed to the holder 21 side. It is composed of a bolt 29 with a bolt.

As shown in FIG. 5, the head portion 28a of each pressing pin 28 has a truncated cone shape so that the diameter becomes gradually smaller toward the shaft portion 28b, and the hexagon socket head cap screw 29 is screwed into the head portion 28a. When this is done, the peripheral surface of the head portion 28b is brought into contact with the peripheral edge of the cutting piece 22 inserted in the recess 23, and the inclination thereof presses the cutting piece 22 toward the engaging portion 25. While being moved, the bottom of the recess 23 is pressed into contact.

On the other hand, reference numeral 30 in FIG. 1 denotes a screw hole formed in the base end portion of the holder 21, so that the holder 21 can be attached to various devices by a bolt (not shown) screwed into the screw hole 30. It has become.

The operation of the present embodiment configured as described above will be described below.

First, the procedure for mounting the cutting piece 22 will be described. First, loosen each hexagon socket head cap bolt 29 to remove the head of the pressing pin 28.
28a is floated from the holder 21, and the cutting piece 22 is inserted into the recess 23 by utilizing the wide portion of the parallel portion 23b.

Next, after rotating the cutting piece 22 so that one of the cutting blades 22b formed on the cutting piece 22 is located substantially in the center of the notch 24 of the recess 23, the cutting piece 22 is engaged with the engaging portion. The engagement groove 25a of 25 is fitted.

From this, by tightening each hexagon socket head bolt 29, the peripheral surface of the head portion 28a of the pressing pin 28 is brought into contact with the peripheral edge of the cutting piece 22, and by further tightening each hexagon socket head bolt 29, the cutting piece 22 is pressed against the engaging portion 25 with a predetermined pressure.

By the above operation, the cutting piece 22 is, as shown in FIG.
It is fixed to the holder 21 while being supported at four places by the pair of engaging portions 25 and the pair of pressing pins 28.

Further, when removing the cutting piece 22, the reverse operation is performed.

As described above, in the wire rod cutting knife 20 of the present embodiment, the cutting piece 22 is easily attached and detached by tightening or loosening the pair of hexagon socket head bolts 29.

Therefore, even if the cutting piece 22 is damaged,
Only 22 can be dealt with.

Moreover, in the state where the cutting piece 22 is mounted on the holder 21, the pair of engaging portions 25 and the head portions 28a of the pair of pressing pins 28 are engaged at four positions as described above, and the engaging force is Since it acts almost along the surface direction of the cutting piece 22, it is possible to prevent the cutting piece 22 from being damaged and firmly hold it.

As a result, even the thin cutting piece 22 is securely held without lowering the holding strength.

Further, even if the cutting pieces 22 having different thicknesses are mounted within the same range, it is possible to mount the cutting pieces 22 on the same holder 21, and thus the holder 21 is shared, and the cost and the storage efficiency are improved. Is improved.

Further, in the present embodiment, since the rear portion of the cutting piece 22 in the cutting direction is pressed forward in the cutting direction to engage with the engaging portion 25, the cutting piece 22 is attached to the holder 21. On the other hand, there is no risk of rattling the cutting piece 22 or loosening of the bolt and adversely affecting the cutting, as compared with a structure in which the cutting piece 22 is fixed without looseness and is fixed with a bolt, for example. Further, since the cutting piece 22 is fixed by the above-mentioned configuration, it is possible to firmly fix the cutting piece 22 even if the cutting piece 22 is small. This is superior to the fact that the size of the cutting piece itself must be increased in order to prevent the strength of the cutting piece from decreasing due to holes.

Further, in the present embodiment, the cutting blade 22 is provided at two locations on the cutting piece 22.
Since b is formed, even if one of the cutting blades 22b is damaged, a new cutting blade 22b can be simply rotated by rotating the cutting piece 22 by 180 °.
Can be switched to.

It should be noted that the shapes, dimensions, and the like of the constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like.

For example, although the example in which the cutting edges 22b are formed at two locations has been shown in the above embodiment, the number of the cutting edges 22b can be set arbitrarily.

[Effects of the Invention] As described above, the wire cutting knife according to the present invention has the following excellent effects.

The cutting pieces can be easily attached and removed by tightening or loosening the bolts.

Therefore, even if the cutting piece is damaged, it is possible to deal with it by exchanging only the cutting piece.

Moreover, when the cutting piece is mounted on the holder, the cutting piece is locked by the pair of engaging portions and the pressing member, and the locking force acts substantially along the surface direction of the cutting piece. It can be firmly held while preventing breakage.

As a result, even a thin piece can be reliably held without lowering its holding strength.

Further, even if the cutting pieces have different thicknesses, as long as the difference is within a certain range, they can be attached to the same holder, and thus the holder can be shared,
Cost and storage efficiency are improved.

Further, since the rear portion in the cutting direction of the cutting piece is pressed forward in the cutting direction to engage with the engaging portion,
The cutting piece is firmly fixed to the holder, and there is no risk that the cutting piece will rattle or the bolt will loosen and adversely affect cutting, as compared with, for example, a structure in which a hole is formed in the cutting piece and fixed with a bolt. Further, since the cutting piece is fixed by the above-mentioned configuration, even if the cutting piece is small, it is possible to firmly fix the cutting piece. This is superior to the fact that the cutting piece itself has to be enlarged to prevent the strength of the piece from decreasing.

Further, it is possible to prepare many kinds of cutting pieces only, and it is possible to promptly deal with a change in processing conditions.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention.
FIG. 1 is an exploded perspective view, FIG. 2 is a plan view in which a part of the holder is omitted, FIG. 3 is a front view of a cutting piece, FIG. 4 is a plan view of the cutting piece, and FIG. FIG. 6 is a side view of the pin, FIG. 6 is a partially omitted plan view showing a state where the cutting piece is mounted on the holder, and FIGS. 7 and 8 show a conventional example of a wire rod cutting knife. FIG. 8 is an exploded perspective view, FIG. 8 is a front view, FIG. 9 is a schematic front view of a composite header equipped with a conventional wire cutting knife, and FIG. 10 is a schematic view of the composite header shown in FIG. FIG. 20 …… Knife for cutting wire rod, 21 …… Holder, 22 …… Cut piece, 23 …… Concave, 24 …… Notch, 25 …… Engagement part, 28
(26) …… Pressing pin (pressing member).

Claims (1)

(57) [Scope of utility model registration request] 1. A wire rod cutting knife for cutting a wire rod to a predetermined length, the knife comprising a flat plate-shaped holder and a disc-shaped cutting piece mounted on the front portion of the holder in the cutting direction. A concave portion is formed in the front portion of the concave portion, the concave portion opening on one side in the thickness direction and into which the cutting piece is inserted. And forming an engaging portion in the vicinity of both ends of the cutout of the peripheral wall of the recess, with which the peripheral edge of the cutting piece is engaged, and by a pressing member provided in the holder, a cutting direction of the cutting piece. A knife for wire rod cutting, characterized in that the cutting piece is fixed to the holder by pressing the rear portion forward in the cutting direction to engage the engaging portion.