JP2500215Y2 - Cutting tool for XY plotter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a cutting tool that is mounted on an XY plotter and cuts a member to be cut.

[Prior Art] An XY plotter equipped with a cutting tool of this type is known, for example, from Japanese Patent Laid-Open No. 63-2691. As a cutting tool of this kind, conventionally, as shown in FIG. 5, a cutting blade 1 is provided so as to protrude below a tubular body 2, and the blade pressure of the cutting blade 1 is received to push it against a member to be cut 3. A pressing portion 4 formed by a sliding surface 4a that slides in a contact state is provided on the lower surface of the cylindrical body 2, and the pressing depth of the cutting blade 1 is regulated by this pressing portion 4. 2 is attached to a carriage head of an XY plotter (not shown), and X and Y are applied to a member to be cut along with the operation of the carriage head.
It is known that the cutting is performed by moving it along a direction.

For example, Japanese Utility Model Laid-Open No. 61-141092 or Japanese Patent Laid-Open No. 61-214997.
Issue is disclosed in detail.

[Problems to be Solved by the Invention] In the cutting tool of the above-mentioned conventional XY plotter, since the pressing portion 4 is formed by the sliding contact surface, the pressing portion moves as the cutting tool moves. A large frictional resistance is generated between the sliding contact surface 4a of No. 4 and the member to be cut.

On the other hand, due to the mechanism of the XY plotter, the carriage head and the like on which the cutting tool is mounted are movable, and since the respective constituent parts thereof are not completely rigid bodies, the carriage head and the like and their respective parts. The components are
When an excessive load is applied from the outside, the cutting tool may be deformed, and thus the cutting tool may be deformed.

Therefore, for example, when the cutting tool moves in the direction of arrow A in FIG.
As shown by the chain line in the figure, there is a tendency to deform into an inclined state and move on the member to be cut, which causes rattling and vibration in the carriage head, and the cutting tool
It causes so-called stick-slip vibration,
There are problems that the cutting blade bounces during cutting, a predetermined cutting depth cannot be maintained, an accurate cutting position cannot be obtained, and the cutting line becomes a broken line.

The above problem becomes more remarkable as the blade pressure of the cutting blade is increased and the cutting speed is increased. Therefore, lowering the blade pressure and slowing the cutting speed will alleviate the problem, but lowering the blade pressure will result in poor sharpness, and slowing the cutting speed will reduce the efficiency of cutting work. The problem arose.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to suppress frictional resistance between a pressing portion and a member to be cut accompanying the movement of a cutting tool, so-called stick-slip. Preventing vibration, maintaining a predetermined depth of cut, and obtaining an accurate cutting position, stable cutting is possible even with high blade pressure and high cutting speed, and good cutting and It is to provide a cutting tool in an XY plotter that can obtain a high cutting work efficiency.

[Means for Solving the Problems] In the present invention, in order to solve the above-described conventional problems, the member to be cut is relatively moved in the X direction and the Y direction to cut the member to be cut. In an XY plotter equipped with a cutting tool, with a cutting blade,
In a cutting tool having a pressing portion that presses against the member to be cut and restricts a cutting depth of the cutting blade, the pressing portion is composed of a plurality of spherical bearings capable of making point contact with the member to be cut. In addition, the present invention proposes a cutting tool for an XY plotter, which is characterized in that these bearings are respectively arranged in hemispherical concave bearing receiving portions formed on the lower surface of the main body of the cutting tool.

[Operation] According to the present invention, according to the above-mentioned configuration, the pressing portion is composed of a plurality of spherical bearings capable of making point contact with the member to be cut, and these bearings are formed on the lower surface of the main body of the cutting tool and have a hemispherical shape. Since it is arranged in each of the concave bearing receiving portions, the frictional resistance between the holding portion and the member to be cut accompanying the movement of the cutting tool is suppressed, so that so-called stick-slip vibration is not caused, The cutting depth can be maintained, an accurate cutting position can be obtained, stable cutting can be performed even if the blade pressure is increased and the cutting speed is increased, and good cutting performance and high cutting work efficiency can be obtained.

[Embodiment] An embodiment of a cutting tool in an XY plotter according to the present invention will be described with reference to the drawings.

First, the XY plotter will be described. As shown in FIG. 4, a base 12 on which the member to be cut 11 can be placed, X rails 13 and 13 arranged on both sides of the base 12, and the X rail 13 are provided. A Y-rail 14 running along the carriage head 15, a carriage head 15 running along the Y-rail 14,
It consists of a cutting tool 16 attached to 15,
As the carriage head 15 travels, the cutting tool 16 moves in the X and Y directions with respect to the member 11 to be cut, so that the member 11 to be cut can be cut.

 Next, the cutting tool 16 will be described.

Reference numeral 17 denotes a tubular main body, and a mounting collar portion 18 is provided on the central outer peripheral portion.

Reference numeral 19 denotes a rod, which is arranged inside the main body 17 so as to be able to move up and down through a screw mechanism, and an upper end portion thereof extends from the main body to the outside, and an operation portion 20 is formed therein. A lock nut 21 is screwed between the operation portion 20 and the main body 17, and the tightening of the lock nut 21 holds the up / down position of the rod 19.

22 is a cutting blade, located below the main body 17
It is attached to the lower end of 19 so that it can be interlocked with it.
By the raising and lowering operation of 19, the predetermined cutting depth described later is set according to the thickness of the member 11 to be cut. Here, the attachment axis of the cutting blade 22 is the rod 19
The cutting blade 22 is eccentric with respect to the axis of the cutting tool 16 and is adapted to follow the cutting blade 22 in the proper direction according to the change in the moving direction of the cutting tool 16.

Reference numeral 23 denotes a cap member, which is screwed and fastened to the lower end of the main body 17 via a sleeve member 28. An opening 24 is formed in the center of the opening 24, and the cutting blade 22 projects downward from the opening 24.

Reference numeral 25 denotes a spherical bearing that constitutes a protrusion, and is formed of, for example, a thrust bearing. This bearing
The caps 25 are located on the lower surface of the cap member 23 in a concave bearing receiving part 26 formed in a substantially hemispherical shape, and are arranged at equal angular intervals around the cutting blade 22 as shown in FIG. . Reference numeral 27 is an annular bearing retainer plate that holds the bearing 25 in the bearing receiving portion 26.

The bearing 25 is pressed against the member 12 to be cut by the blade pressure of the cutting blade 22 in a point contact state, so as to form a holding portion that regulates the cutting depth of the cutting blade 22 with respect to the member 11 to be cut. Has become.

The cap member 23 forming the bearing receiving portion 26 may be made of an oil-impregnated resin having a small friction coefficient, a metal bearing, or a solid coating of a lubricant on the bearing 25.

Further, in order to secure stable cutting, it is preferable to dispose the bearing 25 as close to the cutting blade 22 as possible. Furthermore, for that purpose, the bearing 25
The number of is usually 3 or more, but considering the installation space, 5 is preferable as shown in FIG.

In FIGS. 1 and 2, the arrow B indicates the moving direction of the cutting tool 16.

With the above configuration, since the pressing portion is formed by the bearing 25 that can roll in the point contact state with respect to the member to be cut 11, when the cutting tool 16 moves to cut the member to be cut 11, the movement is accompanied by the movement. The friction resistance between the bearing 25 and the member to be cut 12 is suppressed, so-called stick-slip vibration is prevented from occurring, a predetermined cutting depth is maintained, an accurate cutting position can be obtained, and the blade pressure can be increased. Even if the cutting speed is increased or the cutting speed is increased, stable cutting is possible, and good sharpness and high cutting work efficiency can be obtained.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

[Advantages of the Invention] As described above, according to the cutting tool of the XY plotter of the present invention, the pressing portion is composed of a plurality of spherical bearings capable of making point contact with the member to be cut. Since these bearings are arranged in the hemispherical concave bearing receiving portions formed on the lower surface of the main body of the cutting tool, the frictional resistance between the pressing portion and the cut member accompanying the movement of the cutting tool is reduced. Suppresses the so-called stick-slip vibration, maintains a predetermined depth of cut, and can obtain an accurate depth of cut, enabling stable cutting even when the blade pressure is high and the cutting speed is fast. Therefore, various effects such as good sharpness and high cutting work efficiency can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a cutting tool for an XY plotter according to the present invention, FIG. 2 is an enlarged cross-sectional view of a main part thereof, FIG. 3 is a bottom view thereof, and FIG. Is a schematic plan view showing an XY plotter, and FIG. 5 is a front view showing a conventional cutting tool. 11 …… Cut member, 15 …… Carriage head 22 …… Cut blade, 25 …… Bearing

Claims (1)

(57) [Scope of utility model registration request] 1. An XY plotter equipped with a cutting tool that moves relative to a member to be cut in the X and Y directions to cut the member to be cut, the cutting blade and the member to be cut. In a cutting tool having a pressing portion that presses against the cutting blade to regulate the cutting depth of the cutting blade, the pressing portion is constituted by a plurality of spherical bearings capable of making point contact with the member to be cut, and these A cutting tool for an XY plotter, characterized in that each of the bearings is arranged in a hemispherical concave bearing receiving portion formed on the lower surface of the main body of the cutting tool.