JPS63156610A - Cutting tool - Google Patents

Abstract

PURPOSE:To bring large cutting force into full play, by installing a stationary knife and a rotary knife at a tip of a base plate, attaching a link member pivotally to an eccentric position of the rotary knife as well as attaching a roller pivotally to a base of this link member, and installing a roller travel driving part in the base plate. CONSTITUTION:The cut work directed to an orthogonal direction with the rotation direction of a rotary knife 8 is inserted into an opening 3 being formed in a jaw part 2. And, a driving part 28 being installed in a base of a base plate 1 is operated, making a cylinder 30 move in the tip direction. With this, a face body 17 is slidden in the fore direction, whereby a roller 15 also travels in the fore direction. In addition, since a link member 13 also moves in the fore direction, a fore part 13a is pushed to the fore part and the upper direction, whereby the rotary knife 8 is rotated with a shaft 9 as the center, and an interval with a stationary knife 4 dwindles away to zero, thus the cut work is sheared. With this action, deformation of the cutting surface is little, and there is no cutting noise, thus large cutting force is brought into full play.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutting tool for steel materials such as reinforcing bars and steel wires.

[Prior art]

Conventionally, when cutting steel materials such as reinforcing bars on-site, a hand-held cutting tool has been used.

[Problem that the invention seeks to solve]

However, conventional cutting tools close a pair of opposing blades to cut into the object that is interposed between them, which requires a large cutting force and deforms the cut surface due to compression. Furthermore, the cut pieces were scattered in unexpected directions.

Additionally, there were other problems such as cutting noise.

The present invention has been made to solve these problems, and it is possible to prevent the pieces to be cut from scattering, generate no cutting noise, reduce the deformation of the cut surface, and reduce the axis of the cut object. Can be cut nearly perpendicular to the center, and is small in size.
The purpose is to provide a cutting tool that is lightweight and has a large cutting force.

[Means to resolve the gap]

In order to solve the above-mentioned problem, the cutting tool of the present invention is provided with a fixed blade in the jaw formed at the tip of the base and a rotary blade that forms a blade part together with the fixed blade. A link member extending toward the base is pivoted at an eccentric position, and a roller that runs along a concave guide formed in the neck of the base is pivoted to the base of the link member. The present invention is characterized in that the base of the stand is provided with a drive unit for driving the roller.

[For production]

As described above, the cutting tool according to the present invention is capable of shearing the willow to be cut in a thread-cutting manner by the blade portion formed by the fixed blade and the rotating blade. It can be cut nearly perpendicularly to the axial direction of the machine, and the cut pieces do not scatter without making cutting noises. Furthermore, since the rotary blade is pivoted at an eccentric position or rotated by a drive part i provided at the base via a link member, a large rotational force can be obtained.

In addition, a roller is attached to the base of the link member.

By running this roller along a concave guide formed in the neck of the base, even greater rotational force can be obtained.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

1 to 6 show one embodiment of the present invention. The base 1 located at the center has a fixed blade 4 fixed by a screw 5 to the inner opening 3 side of the jaw 2 formed at the tip. The jaw 2 is bifurcated into two protrusions 5a and 5b, and a rotary blade 8, which together with the fixed blade 4 forms a blade 7, is rotatably attached to a shaft 9. ing. In this embodiment, the rotary blade 8 is formed into a plate shape with a wall thickness similar to that of a magatama on the side surface, and has a cutting edge 10 at its periphery at a position facing the fixed blade 4 of the head 8a.
are fixed by screws 11, and when the rotary blade 8 rotates about the shaft 9 in the closing direction shown in FIG. Becomes zero. A central opening 12 is formed in the tail portion 8b of the single-rotation blade 8, and a tip 13a of a link member 13 extending in the proximal direction is connected to the shaft 1 in the central opening 12.
4, it is rotatably attached to the shaft. Furthermore, a pair of rollers 15.15 is provided on the base end side 13b of this link member 13.
is fixed by a shaft 16.

Furthermore, reference numeral 17 has a hook 1 on the proximal end for connection to the drive unit, which will be described later.
Both protruding ends 20.20 of the shaft 16 are installed between the side plates 19.19 of the hD. In this embodiment, the protruding end portion 20.20 is formed into a columnar shape, and the vertical groove 21 is formed on the inner surface of the both side plates 19.19.
．． The side plates 19 and 19 of the box 17 are fitted with a pair of side plates 19 and 19 fixed to both sides of the base l by screws 21, and the inner surfaces u and 24 of 23 They are each slidably fitted into transverse grooves 5.25 formed in the lateral grooves 5.25.

Further, a guide n for the rollers 15.degree. 15 is formed on the neck portion of the base l. In this embodiment, this guide n is formed in a concave shape. In length.

The pair of side plates 23. At the base of Z30, drive part 4 has screw 2
91 days have been fixed. In this embodiment, the drive unit Z
is composed of, for example, a hydraulic cylinder.

By hooking the connecting hook 18 attached to the base of the box 170 to the tip of the cylinder (9), the roller ts is moved through the box 17 toward the tip and base. In particular, in this embodiment, a connecting hook 18 biased in the direction of arrow B by a spring 31 shown in FIG. 6 is engaged with an annular groove 32 formed at the tip of the cylinder. Therefore, simply by arranging the connecting hook 18 and the annular groove 32 and joining them as they are, the two engage with each other, which is much easier to operate than the conventional screw structure engagement. In the figure, the support fixed to the side surface of the protrusion 6a of the base 1 by a shaft 91 is a stand, and a V-shaped groove is formed in the lower part, and the jaw part 2 and this groove make a rod. It supports the object to be cut such as steel material.

To use this embodiment configured as described above, first insert the material to be cut into the opening 3 formed in the jaw 2 in a direction perpendicular to the direction of rotation of the rotary blade 8. The receiver is supported between the grooves of the base and the fixed blade 4. At this time,
The cutting part of the story to be cut is cut by the cutting edge 1G of the rotary blade 8 and the fixed blade 4.
11 is placed at the sliding contact point with the base 1, and when the drive bracket provided at the base of the base 1 is activated to move the 7 cylinder I toward the tip, a box 17 is formed on the side plates β, 23. 5.25 and slides toward the tip. Therefore, this case 17I is supported by the roller 15.1.
5 also travels toward the tip, and at the same time, as shown in FIG. 7, the base 13b of the link member I3 moves toward the tip, so the tip 13a is pushed toward the tip and upwards and rotates. The movable blade 8 rotates around the shaft 9, and the distance between it and the fixed blade 4 gradually becomes zero, and the story to be cut is sheared. When cutting, the rollers 15.15 are moved to the base 1 by the reaction force of the rotary blade 8.
The guide 27f formed on the neck 2 of the machine runs while being pressed against it.In the present invention, the guide n is formed not in a planar shape but in a concave shape. In addition to the rotational force generated by the crank and link mechanism, even greater rotational force can be obtained.

Next, this rotational force, that is, the load applied to the rotary blade will be explained. When the load applied to the rotary blade of the cutting tool according to the present invention is determined for the embodiment shown in FIG. In such a mechanism, the rotational force U is generally given by the following equation.

Here, W is the pusher pressure on the roller 15, and θ is the pushing direction and the axis 9.
Also, the angle formed by the axis 37 connecting the axis 14 and the joint, and the length of each axis of the seven companies! ! is the distance between the center of the shaft 14 and the center of the shaft 16 of the crank member 13.

1. For example, in the embodiment having the guide γ shown in FIG. 7 and the case having a planar guide, the roller 1
The results of determining θ and the load U applied to the rotary blade in each case at the axial center positions @a to k of No. 5 are shown in the following table.
In addition, Id r=85s+m, l! in non-example. =67
-m, roller pressing force is 4000 Kg, and θ is 7
The actual measurements in the figure were obtained.

The load U applied to the rotating blade is the final value rounded to the first decimal place: clias°so''3951139°30' 3
886i This table shows that when the guide is made concave as in the example shown in Fig. 7, the load applied to the rotary blade is greater than when the guide is made flat, and therefore a large cut can be made with a constant driving force. It turns out that it is possible to cut objects using force. Fig. 8 is a graph showing the load applied to the rotary blade at each roller position shown in the table above.In the case of this example, a larger rotational force is generated compared to the case where the plan FF327 is made into a planar shape. It is clearly shown that it is possible to obtain In the non-example, the guide moss was formed into a concave surface that becomes part of the circumference, but it may also be shaped so that a rotating blade is generated at the position of the roller 15 that requires the most load during cutting. It is often considered that the rotary blade has various shapes.

〔Effect of the invention〕

Since misfire #4 has the above-mentioned configuration, it can cut as close as J perpendicular to the axis of the 4ζ workpiece with little deformation of the cutting surface, and it does not produce cutting noise and is easy to cut. It has many advantages such as no cutting pieces scattering, being small and lightweight, and exhibiting a large cutting force.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front partial view, Fig. 2 is a side view thereof, Fig. 3 is a plan partial view, and Fig. 4 is a diagram showing the A-entry line in Fig. 3. 5 is a perspective partial view, FIG. 6 is an explanatory diagram showing the link member, the state of connection between the roller and the drive unit, and FIG. 7 is a diagram showing the load applied to the rotary blade E during cutting. The explanatory diagram, FIG. 8, is a graph showing the relationship between the position of the row 2 and the load applied to the rotary blade. 1...Base, 3...Jaw, 4...
...Fixed blade. 7...Blade portion, 8...Rotary blade,
13... Link member, 15... Roller, 26... Neck, 27... Guide. Ah... the drive section.

Claims (1)

[Claims] A jaw formed at the tip of the base is provided with a fixed blade and a rotary blade that forms a blade part together with the fixed blade, and a link member extending toward the base is pivoted at an eccentric position of the rotary blade. At the same time, a roller that runs along a concave guide formed in the neck of the base is pivoted to the base of the link member, and a drive unit for driving the front and the old rollers is attached to the base of the base. A cutting tool comprising: