JPH079414A - Replacement blade and holder for flat blades - Google Patents

Abstract

(57) [Summary] [Purpose] A replacement blade type flat blade tool that can be installed in the same way as an integrated blade tool without modifying the tool rest of the processing machine. [Structure] The cross-sectional shape is a V shape and has an arbitrary length, and the opening angle θ ₁ on the convex side and the opening angle θ _{2 on the} concave side of the V shape are θ ₁ ≧ θ ₂
The replaceable blade 1A formed in the above relationship is fixed by the bolt 4 by sandwiching one convex surface by the contact surface 2a at the tip of the holder body 2 and the concave surface by the contact surface 3a at the tip of the presser foot 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knife used for crushing, cutting, cutting and the like of wood and materials that can be treated similarly to wood.

[0002]

2. Description of the Related Art Conventionally, an integrated chipper knife (flat blade) 101 as shown in FIGS. 11 and 12 is often used as a blade for treating wood into wood chips. This type of flat blade, which is used for long cutting and heavy cutting, is thick and heavy.Therefore, skill and great labor are required for mounting, removing, and adjusting the position of the blade when the blade is replaced due to wear of the blade. It has been inconvenient because it takes time, and in addition, it requires considerable labor and attention to safety just to carry the blade.

The technology developed for this purpose is disclosed in Japanese Patent Publication No. 56-5.
There is a spare blade type chipper knife of No. 1887. FIG. 13 is a view of this prior art, in which the spare blade 102 has two pairs of four contact surfaces, and the contact surfaces of each pair form an angle with each other and are located in a plane other than the blade surface. Also, it is sandwiched between the holder body and the presser foot, corresponding to the contact surfaces 103a and 104a of the pad 104. The four contact surfaces also serve as conduction surfaces for cutting heat generated near the blade edge of the spare blade.

[0004]

There are a front blade type as shown in FIG. 11 and a back blade type as shown in FIG. 12 in the method of attaching the chipper knife. In the front blade type, to the back side of the blade, in the back blade type, The blades are set so that the chips are ejected to the side of the relief surface. And in any case, the main component R _{1 of the} cutting resistance
And the back force R ₂ shocks the blade. In particular, R ₂ is a troublesome thing that acts on both the positive side and the negative side depending on the cutting conditions and the worn state of the cutting edge, and it is necessary to consider the rigidity near the cutting edge. In addition, if the cutting heat generated near the cutting edge during cutting accumulates excessively, the life of the cutting tool will be affected. Therefore, in the technology of Japanese Patent Publication No. 56-51887 described above, even if the blade is made smaller, the blade 102 has a sufficient thickness for strength as shown in FIG. 13, and the cutting heat generated at the blade tip is changed. Since the contact area between the blade and the holder was increased in order to allow the blade to escape sufficiently, it has not been sufficiently miniaturized.

Therefore, the holder for accommodating and holding the spare blade 102 is inevitably large, and the space for mounting the integrated chipper knife (the stepped portion of the tool rest) is expanded, that is, the stepped portion of the tool rest 105 of the processing machine is further expanded. There is a problem that the blade edge cannot be set at a predetermined position unless it is deepened. The present invention has been made in view of such problems of the prior art, and the object thereof is to mount at least a double-edged replacement blade without modifying the tool rest, and to provide sufficient replacement blade fixing rigidity. The present invention intends to provide a spare blade and a holder for a flat plate-shaped blade having a.

[0006]

In order to achieve the above object, a spare blade of a flat plate-shaped tool according to the present invention has a dogleg-shaped cross section having an arbitrary length, and a blade tip is provided at at least one end of the dogleg shape. The opening angle θ ₁ on the convex side and the opening angle θ _{2 on the} concave side of the V-shape are formed in a relationship of θ ₁ ≧ θ ₂ . In addition, the flat blade tool holder is a holder for a replaceable blade having a V-shaped cross section, and a contact that abuts one of the two surfaces forming the V-shaped convex surface on either the holder body or the presser foot. A surface is provided, and a contact surface that comes into contact with the V-shaped concave surface is provided on the other side, and the replacement blade is sandwiched by a tightening member.

[0007]

In the front blade type, the contact surface of the holder main body comes into contact with one of the two surfaces forming the convex surface of the blade, and the contact surface of the presser plate comes into contact with the two surfaces forming the concave surface to replace the blade. Sandwich,
Secure with tightening bolts. In the back blade type, the contact surface of the holder main body contacts the two surfaces forming the concave surface of the replacement blade, and the contact surface of the presser foot contacts one surface of the two surfaces forming the convex surface to sandwich the replacement blade, Secure with tightening bolts.

[0008]

Embodiments will be described below with reference to the drawings. First, the spare blade will be described. The spare blade 1A in FIG.
It is a small-sized replaceable blade having a V-shaped cross section and an arbitrary length, and the opening angle θ ₁ on the convex side and the opening angle θ _{2 on the} concave side of the V-shaped section are formed in a relationship of θ ₁ ≧ θ ₂ . Further, as shown in FIG. 2, a replaceable blade 1B can be used in which the concave side of the V-shape is an arc surface approximate to the opening angle θ ₂ .

Next, the holder side for fixing the spare blade will be described. The first embodiment is a front blade type cutter, and as shown in FIGS. 3 to 5, the holder main body 2 has a length that is a multiple of the length of the spare blade 1A, and the tip of the spare blade 1A has a convex side. Contact surface 2a with which one surface abuts is formed, and a contact surface 3a with the same angle as θ ₂ with which the two concave surfaces abut is formed at the tip of the presser foot 3, and the tightening force of the plurality of bolts 4 is increased. It is designed to fix the spare blade 1A. The blade having the spare blade attached to the holder is fixed to the blade base 7 by the plurality of bolts 5 via the blade presser 6, and the main component force R ₁ of the cutting resistance generated when the material W such as wood is cut. The contact surface 2a receives it, and the back force R ₂ is received by the contact surface 3a.

Therefore, the presser foot 3 is required to have a sufficient wall thickness capable of withstanding the back force R ₂ , and in this embodiment, the replacement blade fixed end portion is provided with a protruding ridge portion 3b which does not prevent chip discharge. There is. Since the tool holder 6 does not cover the presser foot, it is possible to replace it by simply loosening the replacement blade fixing bolt 4 without loosening the bolt 5 for fixing the holder body 2 to the tool rest 7 when replacing the replacement blade. Become. Further, in this example, since the cutting edge line is composed of three spare blades 1A, only the spare blade having a relatively high degree of wear can be replaced.

The second embodiment is a back-edged type blade, and as shown in FIG. 6, the replacement blade 1A is fixed by being tightened with the bolt 11 by the holder body 8 and the presser foot 9. However, a protruding mountain portion 8b is provided at the replacement blade fixed end portion of the holder body 8 so as not to interfere with chip discharge, and has a sufficient thickness to increase the clamping strength. In the case of this embodiment, since there is no blade pressing as in the first embodiment, the replacement blade can be replaced by operating only the bolt 11.

The third embodiment is another example of the front blade type, and as shown in FIG. 7, since the blade length is not relatively long, the blade edge line is composed of one replacement blade 1C, The replacement blade 1C has the same cross-sectional shape as the replacement blade 1A, but also has cutting edges on both sides by cutting the flanks 1a on both ends. The holder main body 13 and the presser foot 14 are tightened and fixed by the bolts 15 with the same manner as in the first embodiment, but as shown in FIG.
4, the presser foot 14 can be made even more rigid. Example 4 (FIG. 9) and Example 5 (FIG. 10) are obtained by further extending the first and second ridges 3b and 8b of Example 1 to increase the strength.

Since the replaceable blade of the present invention is basically a reversible type having cutting edges on both sides, the upper and lower sides of the V-shape are symmetrical, but the upper and lower blade angles can be changed, and the cutting edge can only be on one side. It is also possible to In addition, although each embodiment has described the chipper knife, the blade tool using the spare blade of the present invention is not limited to the chipper knife, and all other flat plates when manufacturing the holder including modification of the tool rest. Of course, it can be applied to a blade.

[0014]

Since the present invention is configured as described above, it has the following effects. A small blade with a V-shaped cross section, one of the two surfaces that form the V-shaped convex surface of this blade, and a plate-shaped blade consisting of a retainer for holding the concave surface, the holder body, and a tightening bolt. As a result, the contact surface area is small, but the heat conduction is only slightly reduced, and the cross-sectional shape can be made considerably smaller than that, and it has sufficient replacement blade fixing rigidity and becomes a flat blade tool that can be replaced with an integrated tool. , The versatility is expanded because it can be installed on the processing machine without modifying the tool post.

[Brief description of drawings]

FIG. 1 is a front view and a side view showing an example of a replacement blade of the present embodiment.

FIG. 2 is a side view showing another example of the replacement blade of the present embodiment.

FIG. 3 is a front view and two side views of the first flat plate-shaped tool according to the embodiment.

FIG. 4 is an enlarged view of the spare blade holder of the side view of FIG.

FIG. 5 is a view showing the mounting of the first flat plate-shaped tool to the tool rest of the embodiment.

[Fig. 6] Fig. 6 is a view showing the second flat plate-shaped tool of the embodiment mounted on the tool rest, which also serves as a side view.

7A and 7B are a front view and two side views of a third flat plate-shaped tool according to an embodiment.

[Fig. 8] Fig. 8 is a view showing the mounting of a third flat plate-shaped tool to a tool rest according to the third embodiment.

[Fig. 9] Fig. 9 is a view showing the fourth flat plate-shaped tool attached to the tool post, which also serves as a side view.

FIG. 10 is a view showing the fifth embodiment flat plate-shaped tool attached to a tool rest, which also serves as a side view.

FIG. 11 is a view showing a conventional front blade type chipper knife attached to a tool post which also serves as a side view.

FIG. 12 is a side view of a conventional back-edged chipper knife attached to a tool post.

FIG. 13 is a side view of a conventional replaceable blade type chipper knife, and is also a diagram of attachment to a tool rest.

[Explanation of symbols]

1A, 1B, 1C Replacement blades 2, 8, 13 Holder body 2a, 3a Contact surface 3, 9, 14 Presser foot

Claims (2)

[Claims] 1. A V-shaped cross-section having an arbitrary length, a cutting edge being provided at at least one end of the V-shaped, and the opening angle θ ₁ on the convex side and the opening angle θ _{2 on the} concave side of the V-shaped is θ. ₁ ≧ θ ₂
A blade for a flat plate-shaped blade characterized by being formed in the relationship of. 2. A holder for a replaceable blade having a dogleg-shaped cross section, wherein either one of a holder body and a presser plate is provided with a contact surface that abuts one of two surfaces forming the dogleg shaped convex surface. A holder for a flat plate-shaped tool, characterized in that a contact surface for contacting the concave surface of the V-shape is provided on the other side, and the replacement blade is clamped by a tightening member.