JPH0318116Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a telescopic cover structure that protects the workbed of a machine tool, etc., and in particular, a telescopic cover that is attached to the lower part of the cover body that constitutes the telescopic cover. The present invention relates to an improvement of a shoe part that slidably supports the work bed.

(Prior art) A machine tool, such as a planer, has a table on which a workpiece is fixed, and a work bed (hereinafter simply referred to as bed) on which the table is placed and guides its linear reciprocating motion. . and,
The workpiece on the table that reciprocates in a linear manner is cut by a cutting tool that is attached so as to be adjustable.

Therefore, the machining accuracy of this type of machine tool is influenced by the dimensional accuracy and surface roughness of the bed.

Therefore, to prevent cutting chips or other debris from scattering and adhering to the bed,
As shown in Fig. 5, a so-called telescopic cover A which is extendable and retractable is attached to the bed B, and when the table moves linearly, it expands and contracts over the bed and always covers the bed B, thereby preventing the cutting waste, etc. Protecting. That is, each cover main body 1 constituting such a telescopic cover A becomes larger sequentially from the end side of the bed B, and the sliding protrusion 3 is formed at the tip 1a of each cover main body 1, and the above-mentioned sliding protrusion 3 is formed at the base end 1b. A protrusion 4 that engages with the sliding protrusion 3 is formed. When contracted (see Fig. 5), the end surfaces 5c of the shoes at the bottom of the cover body push the end surfaces 5c of the shoes at the bottom of the cover body adjacent to each other on the bed end side, so that all of the shoes are stored in the largest cover body. When the cover body 1 is extended (see Fig. 4), the cover body 1 is
The sliding protrusion 3 is constructed in a so-called nesting manner so that it can be expanded by engaging and pulling out the protrusion 4 of the adjacent cover body 1 on the center side of the bed B.

Conventionally, the cover body 1 is slidably supported on the work bed B by a shoe 5 attached to the lower part of the partition plate 2a, as shown in FIG. Conventionally, such a shoe 5 has a rectangular bottom surface (contact surface) as shown in FIG. The cover body 2 was attached to the lower part of the cover body 2 so that the long side 5d of the rectangle was perpendicular to the direction of movement.

On the other hand, the workbed B on which the shoe 5 slides
The sliding surface is generally processed and formed using a milling machine, a shaping machine, etc., and when the processed surface is enlarged, it is composed of an uneven surface as shown in FIG. 8.

(Problem to be Solved) Therefore, in the telescopic cover structure supported by this type of support structure, when the telescopic cover slides on the work bed, that is, the tip of the shoe touches the concave part and the convex part of the work bed. When passing through the section, the shoe moves up and down and comes into contact with the work bed, causing vibration.

By the way, since the cover main body of the telescopic cover is made of a thin sheet metal plate having low rigidity, it has a structure that easily functions as a resonance box.

Therefore, in terms of the lifespan of the cover body, the vibrations caused by the vertical movement of the tip of the shoe during the above-mentioned expansion and contraction can damage the sliding surface of the shoe and the sliding parts between the cover bodies, or cause distortion to the cover body. By causing distortion, the smooth operation of the telescopic cover is hindered, which shortens the life of the telescopic cover.Also, in terms of the impact on the working environment, the above-mentioned vibrations are amplified when combined with the cover body acting as a resonance box. This results in a rather harsh vibration sound, which worsens the working environment.

Furthermore, the above situation is based on the current situation of increasing processing speed.
As the speed of expansion and contraction of the telescopic cover increases, the frequency and vibration energy increase, and the problem tends to get worse.

The present invention was developed in view of the above-mentioned current situation, and by providing a telescopic cover structure that takes into account vibrations on the sliding surfaces of the shoe and workbed, smooth operation of the telescopic cover is achieved. The purpose is to maintain, improve the working environment, and further contribute to the acceleration of machine tool speed.

(Means for solving the problem) The telescopic cover structure according to the present invention gradually increases in size as the reciprocating parts such as the table, which is a component part of the machine tool, slides on the work bed. In a telescopic cover structure in which different cover bodies are telescopically configured to cover the work bed, the cover body is attached to a lower part of the cover body so that the cover body can be slid with respect to the work bed. The bottom surface of the supporting shoe is configured so that its length always spans two adjacent convex portions of the uneven portions that constitute the surface roughness of the sliding surface of the work bed at least in terms of length in the advancing direction of the expansion and contraction movement. At the same time, by attaching a shoe with a rectangular bottom surface with the bottom portion obliquely to the advancing direction of the expansion and contraction movement, the tip of the bottom surface of the shoe is formed into a pointed shape by the corner of the rectangular shape. It is characterized by

(Function) Therefore, when the telescopic cover having the above structure slides on the work bed, the bottom surface of the shoe attached to the lower part of the cover body constituting the telescopic cover is always The shoe is suspended and supported by two or more adjacent protrusions on the sliding surface of the work bed, and since the tip of the shoe is formed into a pointed shape by the corners as described above, it can easily reach the next protrusion ahead in the direction of movement. Even when attempting to cross the bridge, it is possible to transfer with extremely little resistance.

Therefore, since the shoe always spans two or more adjacent convex portions on the sliding surface of the work bed, even when the tip of the shoe advances from the concave portion to the convex portion, there is no large vertical movement, and the shoe is suspended over two or more adjacent convex portions. Even if the next protrusion is higher than the previous one, the tip is formed into a pointed shape, so you can move over it very smoothly. As a result, vibrations caused by sliding can be reduced.

Furthermore, since the rectangular bottoms of each shoe are arranged diagonally with respect to the direction of travel, the length in the direction of travel is longer than if they were arranged at right angles to the direction of travel, which reduces the surface roughness of the workbed. The effect of vertical movement of the tip of the shoe due to this is reduced. Moreover, since the bottom surface of each shoe is slanted in the same way, there is no interference between the shoes, and this prevents the cover from shrinking even when the cover body is nested and shrinks. It's not as bulky as it is.

(Example) Hereinafter, an example of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a partial perspective view showing the state of contact between the shoe and the work bed, which is the main part of the present invention, and FIG. 2 is a partial plan view of the same.

It should be noted that the same reference numerals as in the conventional example are used for the same parts.

In FIG. 1, 5 is a shoe, and in this embodiment, the shoe 5 consists of a shoe main body portion 5a having a bottom surface (contact surface) that contacts the work bed B, and an attachment portion 5b that is attached to the cover body 2. Each consists of a rectangle. The shoe 5 is integrally formed as a whole so that the long axes of the shoe main body 5a and the attachment portion 5b are oblique in a plan view (see FIG. 2).
Also, the mounting portion 5b has a partition plate 2a on the side of the cover main body 2.
A mounting hole 5b' for mounting is formed.

Furthermore, when the shoe 5 is attached to the cover main body 2, the length of the shoe 5 is attached to two adjacent convex portions of the uneven surface roughness of the work bed B in the direction in which the telescopic cover expands and contracts. The length is such that it always spans, and in this embodiment, it is configured to span over several or more convex portions.

The shoe 5 is attached to the partition plate 2a of the cover body 2.
It is attached to the lower part of the cover main body 2 by riveting the attachment portion 5b' of the attachment portion 5b. The partition plate 2a portion of the cover body 2 is
The second
(see figure).

Therefore, when the cover body 1 is supported by the bottom surface of the shoe 5 and slides on the work bed B, the bottom surface of the shoe 5 spans (is supported by) a plurality of convex portions on the work bed sliding surface. In other words, it has a sufficient length in the direction of movement relative to the surface roughness of the work bed B. In other words, when the bottom surface of the shoe is the same, compared to the conventional arrangement perpendicular to the direction of travel (see Figure 7), by arranging it diagonally, the length in the direction of travel is L sin θ + hcos θ. −h becomes longer (however,
Length of the side that makes an angle θ with respect to the direction perpendicular to the direction of travel of the bottom of the shoe: h, Length of the side that makes an angle of θ with the direction of travel of the bottom of the shoe: L, Diagonal angle: θ ), there is little effect of the vertical movement of the shoe tip due to the surface roughness of the workbed. In addition, when the tip of the shoe moves onto the next convex portion of the work bed sliding surface, the tip of the bottom of the shoe is sharp (the rectangular corner is located at the tip, forming a sharp tip). Therefore, even if the next protrusion is higher in height than the previous protrusion, the next protrusion can be moved over with little resistance.
Therefore, the generated vibrations are also reduced.

Furthermore, in the case of this embodiment, as shown in FIG. 3, the shoe main body portion 5a is positioned obliquely with respect to the attachment portion 5b or the partition plate 2a of the cover main body 2A. Adjacent cover body 2B
The shoe body 5a of the shoe is connected to the attachment portion 5b of the neighboring shoe.
Since the telescopic cover can enter the lower space, the length of the telescopic cover in the sliding direction when contracted does not become longer than that of the conventional one.

(Effects of the invention) Since the telescopic cover according to the invention has the structure described above, even when sliding on the work bed, the tip of the cover body does not move up and down as much as the conventional one. Therefore, the amplitude and vibration energy are also small. Therefore, the smooth operating life of the telescopic cover is not shortened, and vibration noise is also reduced due to the reduction in vibration, contributing to an improvement in the working environment. Furthermore, as vibrations are reduced, it is possible to easily cope with increased sliding speeds of reciprocating parts such as tables of machine tools.

[Brief explanation of drawings]

Figure 1 is a partial perspective view showing the main parts of the present invention;
The figure is a plan view of the same part, Figure 3 is a partial plane view showing how it is assembled with the adjacent cover body, and Figures 4 and 5 are side cross-sections of the entire telescopic cover in the extended and contracted states. 6 is a perspective view showing a conventional example, FIG. 7 is a plan view thereof, and FIG. 8 is an enlarged side sectional view showing the surface condition of the work bed. A...Telescopic cover, B...Work bed, 1...Cover body, 2...Cover body, 3...
...Sliding protrusion, 4...Protrusion, 5...Show.

Claims (1)

[Scope of Claim for Utility Model Registration] As reciprocating parts such as tables, which are constituent parts of machine tools, slide on the work bed,
In a telescopic cover structure in which cover bodies of different sizes are telescopically configured in a telescoping manner to cover the work bed, the cover body is attached to the lower part of the cover body so as to be attached to the work bed. The bottom surface of the shoe that is slidably supported always spans at least two adjacent convex portions of the uneven portions that constitute the surface roughness of the sliding surface of the workbed in terms of length in the advancing direction of the expansion and contraction movement. By attaching a shoe with a rectangular bottom surface at an angle to the direction of expansion and contraction movement, the tip of the bottom surface of the shoe can be shaped into a pointed shape by the corner of the rectangular shape. A telescopic cover structure comprising: