JPH0746430Y2 - Working table floating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for contacting a work and positioning a work table for performing work such as measurement of a predetermined point in a state of following the work. Of the work table floating mechanism.

[Prior Art and its Problems] After assembling a predetermined member to another member, the work of measuring whether or not the two members are accurately aligned is performed with a work table equipped with a measuring head or the like. Is performed by contacting a work such as an object to be measured. At this time, it is necessary to make the work mechanism follow the work. However, when the work is tilted due to dimensional tolerance or the like, it must be installed so as to follow this tilt. For this reason, the working mechanism is provided by being supported by the floating mechanism. As the floating mechanism, various things have been developed and used conventionally.

By the way, in the case where the work is installed on a member having a spring property, and the work needs to be imitated under a predetermined load, the floating mechanism of the related art does not I could not imitate the work.

[Purpose of the Invention] The present invention has been made in view of the above points, and its purpose is to accurately follow the inclination of the work while a predetermined load is applied to the work. It is to provide a floating mechanism of a work table that can be turned.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention hangs three legs on a work table at a position on a circular locus around the center of gravity of the work table. The roller is provided at four positions on an orthogonal line centering on the center of gravity, and each roller is engaged with a guide formed in the vertical direction.

[Operation] By adopting such a configuration, the work table is given a predetermined weight, and the set load is applied to the work by abutting the three legs hung on the work table against the work. Will be able to. Then, at this time, the rollers are respectively arranged at four positions on the orthogonal line with the center of gravity as the center, that is, in the XY directions, and since these rollers are engaged with the guides, the center of gravity is in the horizontal direction. It does not shift to. However, when the work is tilted, the individual rollers slightly move up and down along the guide according to the tilt, so that the three legs follow the work while applying uniform force. Will be inclined to.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 show the overall structure of a work table equipped with a floating mechanism. In the drawings, 1 is a work as an object to be measured, 2 is a measuring means, and the measuring means 2 is mounted on a floating table 3.
On the lower surface of the floating table 3, three legs 4 are vertically provided at equidistant positions on a circular locus around the center of gravity thereof. The floating table 3 is moved up and down by a cylinder 6 installed on the base plate 5, so that the legs 4 of the floating table 3 can be brought into contact with and separated from the work 1. Reference numeral 7 indicates a guide, and the guide 7 is a floating table 3
It is inserted loosely into the boss 8 attached to the.

Here, as shown in FIG. 3, the work 1 is composed of a plurality of annular plates, which are inserted into the shaft 9. Further, among the plurality of plates, there is a plate 1a having a spring property, and the plate 1a is assembled in a bent state. Therefore, the fitting gap d between the work 1 and the shaft 9 is measured, but the fitting gap d needs to be measured by reproducing the actually assembled state. Moreover, the measuring means 2 must be positioned at a predetermined position in the horizontal direction. Further, the work 1 may be tilted from a reference horizontal plane due to dimensional tolerances and the like.

Therefore, in order to apply a load to the work 1 at the time of measurement, the three legs 4 suspended from the floating table 3 are provided.
The cylinder 6 serving as the lifting drive means is separated from the floating table 3 when it comes into contact with the work 1, and is in a disengaged state.
Therefore, by giving the floating table 3 a predetermined weight, the work 1 is pressed downward by the action of the weight of the floating table 3.

Further, the measuring means 2 needs to be positioned at a predetermined position with respect to the work 1, and moreover, in order to apply an even load to the work 1, the measuring device 2 is made to follow the inclination caused by the dimensional tolerance of the work 1 or the like. There is a need. For this purpose, the measuring means 2
Is arranged at the center of gravity C on the floating table 3 and is configured to be floated in the tilt direction with the center of gravity C as the center.

That is, the center of gravity C of the floating table 3 is
The posts 10 and 10 are erected at positions equidistant from each other in the X-axis direction around the
1,11 are installed. Also, posts 12 and 12 are erected at equidistant positions in the Y-axis direction, and rollers 13 and 13 are mounted on these posts 12 and 12, respectively. Further, the base plate 5 is provided with four guide rails 14 vertically engaged with the rollers 11, 11, 13 and 13, respectively. And, on each of these guide rails 14, the rollers 11, 11, 13, 13 are vertically arranged.
Is provided with a guide groove 14a for rolling.

The present embodiment is configured as described above, and its operation will be described next.

First, the piston rod 6a of the cylinder 6 is contracted to hold the floating table 3 in the raised position, and in this state, the work 1 is positioned at a predetermined position.

Therefore, the piston rod 6a of the cylinder 6 is extended.
As a result, the floating table 3 descends,
The leg 4 contacts the work 1. When the piston rod 6a is further extended from this state, the cylinder 6 and the floating table 3 are separated from each other, and the weight of the floating table 3 acts on the work 1 and is pressed downward by a predetermined amount.

However, when the work 1 is tilted due to dimensional tolerances or the like, one of the rollers 11, 11 rolls upward along the guide rail 14 when the tilt direction is the X direction in FIG. As the other rolls downward, the floating table 3 also tilts so as to follow the tilt of the work 1. When the rollers 1 and 13 are inclined in the Y direction, one of the rollers 13 and 13 rolls upward along the guide rail 14 and the other rolls downward, so that the inclination of the work 1 is imitated. Further, the composite of the inclinations in the X direction and the Y direction causes the inclination in any direction. Therefore, even if the work 1 is tilted when mounted on the shaft 9, the floating table 3 is surely tilted so as to follow it, and there is no fear that the load on the work 1 will be unbalanced.

Moreover, although the inclination of the work 1 can be imitated as described above, the floating table 3 itself is
Since 11, 11 are engaged with the guide rail 14, they are not displaced in the horizontal direction, and the measuring means 2 is mounted at the center of gravity C, so that the measuring means 2 is accurately positioned. As a result, as a result of this measuring means 2,
It becomes possible to always measure from a fixed point, and the measurement accuracy becomes extremely good.

[Effects of the Invention] As described above, the present invention vertically installs three legs that abut the workpiece at a position on a circular locus centered on the center of gravity of the work table, and centers the center of gravity on the work table. Since the rollers are provided at four positions on the orthogonal line and the guides formed in the vertical direction are engaged with the rollers,
The work table can be made to follow the inclination of the work while a predetermined load is being applied to the work. For example, work for measuring a predetermined point on the work can be performed with extremely high accuracy. There are various effects such as being able to do.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an explanatory view showing the overall construction of a work measuring device using the floating mechanism of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. , FIG. 3 is a cross-sectional view showing how the work is mounted on the shaft. 1: Work piece, 1a, 1b: Plate, 2: Measuring means, 3: Floating table, 4: Leg, 10, 12: Post, 11, 13: Roller, 1
4: Guide rail, 14a: Guide groove.

Claims (1)

[Scope of utility model registration request] 1. A mechanism for lowering a work table equipped with a work mechanism including a measuring head and the like by an elevating and lowering drive means to position the work table so as to follow the work, with the center of gravity of the work table as the center. Three legs that abut the work are hung vertically on a circular locus, and rollers are provided at four positions on an orthogonal line centered on the center of gravity, and each roller is formed vertically. A floating mechanism for a work table, which is configured to be engaged with a guide.