JPS62257008A - Bridge-shaped moving apparatus - Google Patents

Abstract

PURPOSE:To accurately move both support in parallel, by providing a tension member to both supports under tension through a tension adjusting jig and a guide so that the tension directions thereof are become opposite to each other. CONSTITUTION:If a slide base 4 is pulled to a forward side by a tension member 16 under the actions of a drive device 20 and a guide 10 in order to move a moving body 2 to the forward side, the same tension is also simultaneously transmitted to the front surface side part Yc of the other slide base 5 by the tension member 17 provided to the rear surface side part Yb of the slide base 4 under tension and by guides 13-15. Therefore, only by the action to one side, the other side receives action simultaneously, in other words, action is applied to both slide bases so as to simultaneously pull both of them and, after all, both slide bases move to the forward side equally in parallel as the moving body 2 without generating the positional shift of the whole.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention is directed to a Y-direction moving section of a moving device such as a coordinate measuring machine called a buritsuno type or gate type coordinate measuring machine, that is, a buritsuno movement drive 8! It is related to the structure.

<Prior art> As in this kind of pre-Fuji-type seat height measuring machine, a movable body is installed on both sides of the table, and the column parts of the movable body are precisely aligned in parallel by preventing relative positional deviation. For moving equipment, the most common rock structure is f.
As shown in figure pJ3, the bases of the pillar parts 2b and 2b,
That is, the slide base 4, which slides on the slide guide 6 provided on one side of the slide base 4.5, is provided with a moving mechanism using a feed screw or the like, and the other slide base 5 is provided with a sliding resistance (movement Wi). In order to reduce this as much as possible, an F-bearing configuration is provided.

Normally, in order to accurately translate this type of moving body, it is desirable to apply a driving force to the center of gravity of the moving mass. However, when there is a reciprocating head 3 as a vertical axis that slides in the left-right direction (X direction) on the beam 2a of the moving body 2 like the coordinate measuring machine mentioned above, the center of gravity of the moving body 2 changes every moment. It was impossible to accurately move the center of gravity.

However, as another means for improving parallel movement accuracy, a drive mechanism is provided on both slide bases 4.5 to control parallel movement, or a beam 2a portion 1 corresponding to the center of gravity of the moving body itself is used. There has been proposed a device in which the guide bar is fixed and extended in the Y direction, and the guide bar is moved forward and backward by a drive device provided at the rear of the machine (for example, JP-A-58-111713).

In the above-mentioned method, it is necessary to control the motor corresponding to the load, and to control the movement deviation due to pitch error of both the feed screw, rack and pinion, etc., and it also requires duplicative equipment as a drive mechanism. It is disadvantageous in terms of cost-effectiveness, and in the latter method, the ratio of dead space to effective stroke of the moving body increases, etc. Nogami was extremely defective.

OBJECTS OF THE INVENTION In view of the above-mentioned deficiencies in the prior art, the present invention utilizes a tensile member such as a wire to achieve accurate synchronization of the surface and skin column parts of a buritsuno-type moving device in a two-piece drive mechanism system. The aim is to make transportation cheaper and more effective.

<Example> The figure shows a coordinate measuring machine as a bridge-type moving device. In Fig. 1, 1 is a table as a base, and 2 is a vertical axis that slides in the left-right direction (X direction) on the figure. The beam 2a is supported by pillars 2b, 2b which are suspended from both ends of the beam 2a, and a table 1 is attached to the lower end of the pillars 2b, 2b. A slide base 4.5, which slides on the top in the vertical direction (Y direction) in the figure, is integrally provided and constitutes a part of the column. However, one slide base 4
is guided by a guide rail 6 that regulates its sliding direction, and in order to detect the amount of movement thereof, a scale 7 is attached to the table side and a scale reading head 8 is attached to the slide base 4 side. The other slide base 5 is simply placed on the top surface of the table 1. Although not shown, both slide bases 4.5 are equipped with an air bearing mechanism in order to reduce their sliding resistance (friction ff1) and allow smooth and accurate movement.

Reference numerals 10 to 15 refer to guides using rollers that are installed with high precision in a part of the corner of the table 1 to prevent core runout, rotational runout, etc., and are located at the front of the table 1, which is the lower side in the figure and the normal operating position side. One guide 10.15 is arranged at each of the side corners, and two guides 11.1 are arranged at each of both rear corners (upper side in the figure) of the table 1.
3.12.14 are arranged. Reference numerals 16 and 17 are tension members made of bendable wires, belts, etc. with a small expansion/contraction ratio, and one end of the tension member 16 is attached to one Y-direction facing surface of the slide base 4, that is, the front side portion Ya. The tension adjustment device 18 is fixed to a hook bolt, turnbuckle, etc., and is connected from the id 10 to the guide 11.12.
It is latched to one Y-direction opposing surface of the slide base 5, that is, the rear side portion Yd, through the slide base 5.

Further, the other tension member 17 has one end connected to the other Y-direction opposing surface of the slide base 4, that is, the rear side Y.
The guide 13 is locked to the tension adjuster 19 attached to b.
It is locked to the other Y-direction facing surface of the slide base 5, that is, the front side portion Yc, via the slide 14 and 15.

In short, each end of the tensioning member 16.17 engages with mutually opposite surfaces when it engages with the slide base 4.5. Reference numeral 20 denotes a drive device such as a motor provided to drive the id 10 on the side of the negative tension member 16, thereby moving the movable body 2 in the Y direction.

In the above configuration, first, in order to move the movable body 2 along the guide rail 6, one slide base 4 is attached to the guide rail on the side of the table opposite to the side of the table where the guide rail is located. to the other slide base 5
Place. Therefore, both slide bases, in other words, both branch offices 2b, must move by the same amount when moving in the Y direction, and must move while maintaining the beam 2a at right angles to the movement in the Y direction. When setting 2b, check the squareness etc. using an appropriate measuring device.

At the next step ν, attach the micrometer (not shown) to both slide bases 4.
Tension side 1 of tension member 16.17 which is arranged in section 5 and is tensioned in the -F-no-load state! The members 16, 17 are gradually tightened by soldiers 18, 19 and set to the proper tension. During this tensioning work, it is necessary to be careful not to cause relative displacement of both slide bases in the Y direction using the micrometer.

After the tensioning work is completed as described above, the tension in each part of the tension member 16, 17 becomes equal and uniform when the movable body 2 is at rest.

When moving the movable body 2 from this state to the lower side of the table, the tension member 16 tensioned on the front WI section Ya of the right slide base 4 is driven by the motor 20 and guided by the guide 10. When pulled, the slide base 4 tends to move forward of the table 1 due to its tension. Due to the action of the slide base 4, the same tension as the tension member 16 on either side is generated in the tension member 17 stretched on the rear side Yb of the base. Then, the tension is transmitted to the front side Yc of the other slide base 5 via the guides 13, 14, 15, and acts to pull the base 5 forward of the table 1. That is, in the case of the embodiment, if the slide base 4 is pulled forward by the tension member 16 by the action of the drive device 20 and the guide 10 in order to move the movable body 2 forward, the same tension is applied to the slide base 4 at the same time. The front side Yb of the slide base 5 is subjected to external force by the tension member 17 and the guides 13 to 15 stretched on the rear side Yb.
Therefore, the effect on the -tension alone causes the other side to act simultaneously, in other words, it acts as if pulling both at the same time, and in the end, the entire moving body 2 changes its position. This results in equal parallel translation to the front side without any deviation.

This effect is exactly the same when moving the moving body 2 toward the rear side. In the case of backward movement, the aforementioned drive device 20
If the rotation of the slide base 5 is reversed, that is, the tension by the tension member 16 via the guide 10 is applied to the rear side Yd of the other slide base 5, the same tension is applied from the base to the slide base 4 by the tension member 17. Since a load is also applied to the rear side nYb, it ends up acting to pull both bases simultaneously, causing the entire moving body 2 to move in parallel to the rear side.

In addition to the above-mentioned embodiments, the configuration of the present invention includes, for example, incorporating the drive device 20 in the slide base 4 (internally and meshing with the guide rail 6 to move the movable body 2; Also provided on the slide base 5 side,
Tension adjustment J418.19 respectively tension member 16.17
Various changes can be made without departing from the intended purpose of the present invention, such as interposing the guide in the middle of the guide, using a pulley instead of a roller as a guide, etc.

<Effects> As described above, according to the present invention, a bridge type structure is provided in which a reciprocating head that slides in the X direction is mounted on a beam installed between columns that move on both sides of the table in the Y direction by a single drive device. In this moving device, the tension can be adjusted between the skin pillars, and the tension members are tensioned via guides so that the tension directions are opposite to each other, so that one pillar can be moved simultaneously with the other pillar. Since both branches will be applied with a moving force in the same direction by the tension member, accurate parallel movement of both branches will be possible. In addition, it is used for parallel movement using a tension member,
Since the tension can be transmitted evenly, it is also possible to provide bridges with increased beam lengths. Furthermore, since the tension member allows both branches to act as if they were equipped with individual drive devices, the movement accuracy of both branches can be maintained even if the torsional rigidity of the support and the bending rigidity of the beam are reduced. This also makes it possible to provide a moving device that has excellent technical and economical practical effects, such as reducing the moving mass and improving the driving speed due to the tongue.

[Brief explanation of drawings]

FIG. 1 is a plan view of a bridge type coordinate measuring machine according to an embodiment of the present invention, FIG. 2 is a fil, a front view of FIG. 1, and FIG. 3 is a schematic perspective view of a conventional device. 1: Table 2: Moving body 2a: Beam 2b: Support 3: Reciprocating head

Claims (1)

[Claims] This is a bridge-type moving device in which a reciprocating head that slides in the X direction is attached to a beam installed between columns that move on both sides of the table in the Y direction by a single drive device, and a tension adjustment device and a tension adjustment device are installed between the two columns. A bridge-type moving device characterized in that tension members are stretched through guides so that tension members are tensioned in opposite directions.