JPH0243755Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of the Y-beam structure for automatic drafting machines, and provides a Y-beam structure that reduces the weight and increases the rigidity of the Y-beam in order to improve the drawing performance of automatic drafting machines. This is what I am trying to do.

FIG. 1 is a plan layout showing an example of the configuration of an automatic drafting machine according to the present invention, and is a diagram showing the position of use of a Y beam for the automatic drafting machine. In the figure, 1 is a Y beam, 2 is a kaleel, and 3 is a drawing head. 4
is a drafting table, and drafting paper is pasted on its surface.
Arrows X and Y indicate movable directions in the X and Y directions, respectively. There are X rails 5, 5' on both sides of the drafting table 1.
The Y beam 1 is provided with a Y rail portion (described later) so that it can move in the X-axis direction on these X rails 5, 5'. A drawing head 3 is mounted on this Y rail section so as to be movable in the Y-axis direction. Reference numeral 6 denotes a belt for driving in the Y direction, which is supported by Y drive pulleys 7 and 7'.
8 is a motor connected to the Y drive pulley 7;
The drawing head 3 is moved in the Y-axis direction at a predetermined speed to a predetermined position. Further, 9, 9' are belts for driving the Y beam 1 in the X direction, one end of which is the drive pulley 10, 10', the other end of which is the driven pulley 11,
11'. Reference numeral 12 denotes a connecting shaft that connects the drive pulleys 10, 10' so that the belts 9, 9' rotate synchronously. One end of this joint shaft 12 is extended to extend the shaft end to the outside of the drive pulley 10, and is connected to a motor 14, which is a drive source, via gears 13, 13', thereby forming a drive system in the X direction.
Reference numeral 15 indicates a bearing that supports the shaft of each pulley.

In an automatic drawing machine having such a configuration, Y beam 1
FIG. 2 is a conventional cross-sectional view of the area surrounding the drawing head 3 taken along the line A, and FIG. 3 is a cross-sectional view of the drawing head 3 according to an embodiment of the present invention.

First, a conventional Y beam structure will be explained. Figure 2 is a diagram showing the structural cross section of a conventional Y beam.
The same parts as in FIG. 1 are given the same reference numerals. In FIG. 2, the Y beam 1 is made of a light material and is formed integrally or with screws. The Y rail 16 is screwed to the Y beam 1 with bolts 17, and the Y rail 16 is screwed to the Y beam 1 with the bolts 17.
The Y beam 1 and the Y rail 16 are fixed together with screws. This Y rail 16
The wheel bearing 18 is rolled on the rail surface of the cassole 2, the drawing head 3, etc. are integrated.
It is configured to be driven by a belt 6 to provide a drawing operation in the Y direction.

However, in order to improve drawing performance and image quality, it is essential to reduce the weight of dynamic parts and increase rigidity. On the other hand, in terms of image quality, Y rail 1
6 is required to have high wear resistance, high rigidity, easy machining, straightness, and the required dimensional accuracy. However, it is difficult to obtain wear resistance and rigidity with light alloys, so currently hard iron-based materials are processed to create the minimum necessary shape, so there is little hope of reducing weight. Furthermore, since the Y beam 1 and the Y rail 16 are fixed and integrated by the bolts 17, the rigidity of microscopic combination cannot be obtained. In addition, the conventional Y beam structure has many drawbacks in achieving high performance functions and high quality image values due to the occurrence of screw loosening due to repeated movements.

In view of the above-mentioned points, the present invention has been made in order to improve this drawback.

FIG. 3 is a sectional view of a Y-beam structure showing an embodiment of the present invention, in which the same parts as in FIG. 2 are given the same reference numerals. In the figure, 1' is a Y beam according to the present invention, in which the shapes of the Y beam main body part 1'a and the necessary parts of the rail part 1'b are integrally formed, and the roller bearing 18
A hardened surface material 19 having high wear resistance and high rigidity is thermally sprayed onto the surface of the rolling rail portion 1'b, thereby forming the beam and the rail into an integral structure.

To describe an example implemented in the present invention, the Y beam 1' is made of magnesium alloy (r = 1.8 g/cm ³ where r is specific weight) cast, and the rail surface of the rail portion 1'b is made of tungsten carbide ( t=approx.
By thermal spraying 0.4m/m (where t is the thickness), the weight was reduced to about 1/3 compared to the conventional method.

In terms of machining accuracy, since Y-beam 1' is constructed as described above, the entire beam has rigidity, high precision and straightness can be achieved easily, and since no screws are used, there is no fear of loosening, which is superior to conventional products. It has many characteristics.

[Brief explanation of the drawing]

Fig. 1 is a plan layout diagram showing an example of the configuration of an automatic drawing machine according to the present invention, Fig. 2 is a diagram showing a structural cross section of a conventional Y beam, and Fig. 3 is a diagram showing a structural cross section of a Y beam according to the present invention. It is. 1,1'...Y beam, 2...Cursor, 3...
...Drawing head, 4...Drawing board, 6,9,9'...
Belt, 7, 7'...Y drive pulley, 8, 14...
...Motor, 16...Y rail, 18...Rolling wheel bearing, 19...Surface hardened material, 1'a...Y beam main body part, 1'b...Rail part.

Claims (1)

[Scope of utility model registration request] In the structure of the Y beam of an automatic drafting machine, a rail part is made integrally with the Y beam main body from the same material, and a hardened surface material with high wear resistance and rigidity is thermally sprayed on the rail surface of the rail part, and the rail and Y A Y-beam structure for automatic drafting machines characterized by a beam formed as an integral structure.