JPS6353930B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cutter for an impact type cutting machine, and particularly to a cutter shaft that is eccentrically attached to a drive shaft and rotates around the drive shaft as the drive shaft rotates. By providing a loose through hole, the centrifugal inertia effect due to the rotation of the drive shaft is improved and the eccentric circuit of the cutter is strengthened.
The present invention relates to a cutter for an impact type cutting machine that effectively cuts a surface to be cut by impact.

[Technical Background of the Invention] Floor cutting machines are generally known as impact type cutting machines. For example, this floor cutting machine removes protrusions, deposits, and hardened laitance from the floor surface.

Additionally, the applicant of this invention has already completed a patent application (Japanese Patent Application No. 146573/1983). In this patent application, as shown in FIGS. 1 to 3, the rotation of a prime mover 4 mounted on a base 2 is transmitted to a drive shaft 1 through belts 6 and 8.
0 and rotates this drive shaft 10 to rotate the drive shaft 10 to the floor surface 1
2. In other words, the drive shaft 1
Two parallel flanges 14 are fixed to the 0, and a plurality of cutter shafts 16 are installed circumferentially at equal intervals between the parallel flanges 14.
A plurality of rectangular plate-shaped cutters 18 are loosely inserted and connected to each of the cutters 6. At this time, an elongated hole 20 is provided as a loose insertion hole for the cutter shaft of the cutter 18, and this elongated hole 20 is made to coincide with the longitudinal direction of the cutter 18, and the center portion 20c of the elongated hole 20 is made to substantially coincide with the center of gravity G of the cutter 18. Configure.

The cutter shaft 1 is rotated by the rotation of the drive shaft 10.
The cutter 18 loosely inserted into the second
As shown in the figure, the cutting blade 22 of the cutter 18 rotates eccentrically and cuts the floor surface 12 by impact.

As shown in FIG. 3, the elongated hole 20 provided in the cutter 18 increases the distance So from the cutter shaft 16 to the cutting blade 22 that performs cutting, and the moment of the cutter 18 increases, resulting in a large impact force. It is something that can be done.

[Problems with Background Art] By the way, as shown in FIG.
The elongated hole 20 of the cutter 18 is aligned with the longitudinal direction of the cutter 18, and the center portion 20c of the elongated hole 20 is aligned with the longitudinal direction of the cutter 18.
8, and the distance So from the center of the cutter shaft 16 to the cutting blade 22 that performs cutting is set. Therefore, in order to obtain even greater impact force with a cutter of the same size, it is necessary to increase the distance So. However, if the elongated hole is extended to the vicinity of the periphery of the cutter to increase the distance So, the robustness of the cutter is impaired and the efficiency of impact cutting is reduced.

[Object of the Invention] Therefore, in order to eliminate the above-mentioned inconvenience, the object of the present invention is to make the central part of the elongated hole provided in the cutter approximately coincide with the center of gravity of the cutter, but not to coincide with the longitudinal direction of the cutter. This improves the centrifugal inertia effect caused by the rotation of the drive shaft, strengthens the eccentric rotation of the cutter, and increases the impact force on the surface to be cut such as the floor, increasing the robustness and long life of the cutter. The object of the present invention is to realize a cutter for an impact-type cutting machine that can maintain the same properties and improve cutting efficiency.

[Structure of the Invention] To achieve this object, the present invention provides an impact-type cutting machine having a cutter that is loosely penetrated through a cutter shaft that is eccentrically attached to a drive shaft and rotates around the drive shaft as the drive shaft rotates. In the cutter, an elongated hole is provided as a loose insertion hole for the cutter shaft drilled in the cutter, and the center portion of the elongated hole is configured to substantially coincide with the center of gravity of the cutter, and the longitudinal direction of the elongated hole is aligned with the longitudinal direction of the cutter. It is characterized by being provided without matching the direction.

[Embodiments of the Invention] Examples of the present invention will be described in detail below based on the drawings.

FIG. 4 shows a first embodiment of the invention. Cutting blades 22, 22 are provided at both ends of one diagonal line L1 of the rectangular plate-shaped cutter 18, and an elongated hole 20 as a loose insertion hole for the cutter shaft 16 is provided in the cutter 18. At this time, the center portion 20c of the elongated hole 20 is provided so as to substantially coincide with the center of gravity G of the cutter 18, and the longitudinal direction of the elongated hole 20 is provided so as not to coincide with the longitudinal direction of the cutter 18. For example, as shown in FIG.
8 and the center 20c of the elongated hole 20 are provided at approximately the same position, and the longitudinal center line C passing through the center 20c of the elongated hole 20 is made to coincide with the diagonal line L1 passing through the center G. shall be established. Then, this elongated hole 20 is formed long, and a cutting blade 2 that cuts the cutter 18 from the center of the cutter shaft 16 is formed.
The distance S ₁ to 2 is configured to be long.

Next, the effect will be explained.

The rotation of the drive shaft 10 causes the cutter shaft 16 around the drive shaft 10 to rotate eccentrically, and the cutter 18 loosely inserted into the cutter shaft 16 to rotate eccentrically due to centrifugal inertia. Then, the cutting blade 22 of the cutter 18 is brought into contact with a work surface such as a floor surface, thereby performing impact cutting on the work surface.

At this time, by configuring the distance _S1 between the cutter shaft 16 and the cutting blade 22 that performs cutting to be long, the cutter 18 during rotation, especially the cutting blade 22 that performs cutting, is configured to be long.
A large moment acts on the cutter 2, and the weight of the cutter 18 acts on the tip of the cutting blade 22 that performs cutting. As a result, the impact force of the cutter 18 can be increased, and the work surface can be effectively cut by impact, contributing to an improvement in work efficiency.

FIG. 5 shows a second embodiment of the invention. In this second embodiment, parts that perform the same functions as those in the first embodiment described above are given the same reference numerals and will be explained.

The feature of this second embodiment is that cutting blades 22 are provided at both ends of one diagonal line L1 of the cutter 18, and the center portion of the elongated hole 20 is provided at the other diagonal line L2.
It is located at a point provided by aligning the longitudinal center line C passing through 0c.

Therefore, the distance S ₂ from the center of the cutter shaft 16 to the cutting blade 22 that performs cutting is shortened, but the center of gravity G of the cutter 18 is moved backward in the rotation direction in the line segment connecting the cutter shaft 16 and the cutting blade 22 that performs cutting. It will be located. As a result, when the cutting blade 22 comes into contact with the work surface during rotary cutting, the center of gravity G, where the centrifugal inertia effect is maximum, is set relative to the rotational direction from the line connecting the cutter shaft 16 and the impact position on the work surface. located at the rear. Therefore, centrifugal inertia acts until the center of gravity G reaches on this line segment, further pressing the cutting blade 22 that is in contact with the work surface, making it possible to perform effective cutting work.

In addition, since the longitudinal center line C passing through the center 20c of the elongated hole 20 and the diagonal line L1 with the cutting blades 22 provided at both ends do not match, the cutting blade 22 of the cutter 18 has an elongated shape. The distance to the hole 20 becomes large. Therefore, the mounting space for the cutter that supports the cutting blade becomes large, and the cutting blade can be replaced multiple times due to damage or wear, which is economically advantageous.

Note that this invention is not limited to the above-mentioned first and second embodiments, and can be modified in various ways.

For example, in the embodiment of the present invention, the end shape of the elongated hole 20 provided in the cutter 18 is formed into an arc shape, but as shown in FIG. It is also possible to form

Moreover, in the embodiment of this invention, the cutter 1
8 shapes were formed into a rectangular plate-like body, but from the 7th
As shown in FIG. 11, the shape of the cutter 18 may be a square plate-like body or a plate-like body of various other shapes.

Furthermore, in the embodiment of this invention, the cutter 1
Although the configuration was such that a straight elongated hole 20 is provided in the hole 8,
As shown in FIG. 12, it is also possible to provide the cutter 18 with a curved, e.g., S-shaped, elongated hole 20. That is, the shape from the cutter shaft 16 position of the one end 20a of the elongated hole 20 to the center portion 20c is formed into an arc shape that protrudes rearward with respect to the rotation direction. Further, the shape from the center portion 20c to the other end 20b is formed into an arc shape that projects forward in the rotation direction.

By doing so, the S-shaped elongated hole can effectively alleviate the thrust in the direction opposite to the direction of rotation of the cutter during impact cutting, preventing deformation of the cutter shaft and damage to the cutter or cutting blade. It is something that can be done.

[Effects of the Invention] As described in detail above, according to the present invention, the central part of the elongated hole provided in the cutter is made to substantially coincide with the center of gravity of the cutter, and is provided so as not to coincide with the longitudinal direction of the cutter. By improving the centrifugal inertia effect caused by the rotation of the drive shaft, the eccentric rotation of the cutter can be strengthened, increasing the impact force on the surface to be cut such as the floor, and increasing the robustness and long life of the cutter. This has the effect of maintaining properties and improving cutting efficiency.

[Brief explanation of the drawing]

1 to 3 show the prior art of this invention.
The figure is a schematic side view of the impact type cutting machine, FIG. 2 is an enlarged view of the portion shown by the arrow in FIG. 1, and FIG. 3 is a front view of the cutter. FIG. 4 is a front view of a cutter showing a first embodiment of the present invention. FIG. 5 is a front view of a cutter showing a second embodiment of the invention. 6 to 12 are front views of cutters showing other embodiments of the present invention. In the figure, 16 is a cutter shaft, 18 is a cutter, 20 is an elongated hole, 22 is a cutting edge, and G is a center of gravity.

Claims (1)

[Claims] 1. In a cutter of an impact type cutting machine having a cutter loosely penetrated through the cutter shaft which is eccentrically attached to the drive shaft and rotates around the drive shaft as the drive shaft rotates, as a cutter shaft loose insertion hole drilled in the cutter. A striking device characterized in that an elongated hole is provided, and the central part of the elongated hole is configured to substantially coincide with the center of gravity of the cutter, and the longitudinal direction of the elongated hole is not aligned with the longitudinal direction of the cutter. A cutter from a mold cutting machine.