JP5043565B2 - Movable table - Google Patents

Description

  The present invention relates to a movable table for fixing and aligning, for example, loading a measurement sample and the like, aligning the measurement base of a measuring machine, and participating in the measurement of the sample Is for.

A movable table is often used for aligning a small and lightweight sample for measurement with a measurement base of a measuring machine.
Prior art 1
An example of a conventional movable table for alignment is shown in FIG. A movable table 1 for alignment shown in FIG. 1 includes an X-direction moving table 2 that can move in the X direction with respect to a measurement base of a measuring machine (not shown), and a Y-direction with respect to the X-direction moving table 2. And a Y-direction moving table 3 that is also a sample mounting table.

  The X-direction moving table 2 is slidably attached to an X-direction fixing table 4 that is fixed to the measurement base of the measuring machine. The X-direction moving base 2 slides and advances and retreats in the X direction when the screw 5 disposed on the X-direction fixing base 4 is turned left and right by a human finger.

  The Y-direction moving table 3 is slidably attached to a Y-direction fixing table 6 that is fixed to the X-direction moving table 2. The Y-direction moving base 3 slides and advances and retreats in the Y-direction when a screw 7 disposed on the Y-direction fixing base 6 is turned left and right by a human finger.

The movable table 1 for position alignment can certainly be aligned with high accuracy, and is fixed at that position after the position alignment is completed.
Prior art 2
FIG. 2 shows another example of a movable table for positioning that has been used conventionally. FIG. 2 shows a plan view of the movable table on the upper right, a front view on the lower right, and a side view on the left. The movable table 8 shown in FIG. 2 has a structure in which a top plate 9a and a plate-like magnet 9b are bonded thereto.

  A sample to be measured is placed between the fixture 9d attached to the top plate 9a using the fixture attachment screw hole 9c and the measurement sample fixing screw 9e, and the movable table is moved horizontally by grasping the measurement material fixing screw. After that, it is moved downward and fixed to the measurement base by the force of the magnet 9b.

Prior art 3
Further, in the cover and base of the socket connector composed of two objects each having a thin plate-like structure, when the cover slides with respect to the base, lateral deflection occurs in a direction perpendicular to the sliding direction. As one of the limiting mechanisms, a configuration in which an operation lever and a drive cam connected to the operation lever in a vertical direction are incorporated is disclosed. (For example, refer to Patent Document 1.)
JP 2004-022538 A

  However, in the case of the prior art 1, the above-described movable table for alignment involves a small and time-consuming operation of turning a screw, and therefore there is a problem that a quick alignment operation cannot be performed.

  In addition, since the two-tiered platform consisting of a fixed platform and a movable platform that slides on the stationary platform is further two-tiered in the X and Y directions, the position of the placed sample is Very high for the measurement base.

On the other hand, when the measuring machine is a three-dimensional measuring machine using a laser beam, the measurement base is often composed of a rotary table.
If the sample mounting table of such a movable table that is positioned on the measurement base composed of the rotary table is at a high position far away from the measurement base, errors due to eccentricity during rotation of the measurement base are There is a problem that the measurement accuracy of the sample loaded on the sample mounting table is adversely affected.

  In addition, the movable table for alignment described above has a complicated mechanism, and thus the entire apparatus becomes large and bulky. Such a bulky device has a problem of being restricted by the measuring machine to be used. Further, there is a problem that the cost is increased by the complexity of the mechanism.

  Furthermore, this movable table is heavy and has a high center of gravity. When the measurement base is a rotary table, a large couple is generated with respect to the bearing, so that there is a problem that an error in eccentricity is large.

  The prior art 2 solves the problems of the prior art 1 that the movable table is expensive, the loading position of the sample is higher than the measurement base, and the movable table is heavy and the center of gravity is high. is doing.

  However, when it becomes necessary to move the movable table once fixed to the measurement base to adjust the measurement position, the measurement data fixing screw 17 is picked up and moved.

  There is no problem if the measurement data can be completely fixed to the movable table, but there are many cases where a part of the measurement sample cannot be fixed although the container and the frame can be fixed. On the other hand, the attractive force of the magnet is so great that the movable table is firmly fixed.

  Therefore, it is difficult to remove the movable table smoothly, and the sample to be measured often moves excessively, making it impossible to collate with the measurement data performed last time, reducing the workability of measurement. I have a problem.

Further, sometimes the movable table is tilted so much that the sample to be measured is dropped, which is a problem.
Prior art 3 shows a mechanism for limiting lateral deflection in a direction perpendicular to the sliding direction when two objects having a thin plate-like structure are relatively slid. Is fitted at a predetermined position, and is not positioned at an arbitrary position by the operation lever and the drive cam.

  In view of the above-described conventional situation, the object of the present invention is that the alignment operation can be performed easily and smoothly, the position of the sample to be mounted on the measurement base of the measuring machine is low, the weight of the movable table is small, and the center of gravity is small. It is to provide a movable table that is low in cost, simple in mechanism and inexpensive.

The movable table of the present invention is a movable table installed on a base made of steel or iron, positioned by manual movement to a predetermined position with respect to the base, and fixed to the base after positioning, A top plate and a magnet fixed to the bottom of the top plate and attracted to the base, thereby fixing the top plate to the base, and the magnet's adsorption force, or the magnet's adsorption force and gravity On the contrary, the mechanism lifts the top plate from the base and lifts the fixed state, and the magnet attracting force, or gravity, or the magnet attracting force and gravity from the predetermined ascending position. The top plate is lowered, and has a mechanism for fixing the top plate to the base by the action of the magnet's attraction force, and rotates between at least two points between the open position and the moving position. Operating lever and the operating lever A shaft portion that is integrally disposed and that rotates forward and backward within the rotation angle according to the rotation of the operation lever; and the base that is formed integrally with the shaft portion and on which the top plate is installed. A cam portion that contacts the top plate installation surface of the base and rotates to a position where the top plate is raised or lowered relative to the base in accordance with the forward and reverse rotation of the shaft portion. It is configured with an elevating mechanism.

  In this movable table, for example, the top plate is a mounting table having a sample fixing device for mounting and fixing a measurement sample. Further, for example, the magnet may be a ferrite magnet plate having substantially the same size as the top plate, or may be divided into a plurality of pieces. Further, the magnet may have a structure in contact with the base, or the magnet may have a structure in which the base and the top plate do not contact with the base. Further, the magnet and the top plate, the magnet and the base, the base and the top plate may be in direct contact with each other, or another part may be interposed in the middle.

With regard to the movement of the shaft portion, for example, a rotating shaft guide slot for guiding the rotation of the shaft portion formed on the top plate, the magnet, or both the top plate and the magnet, and the cam portion It is preferable to have a relief portion serving as a standby position. The rotation guide slot is not limited to the top plate and the magnet, and may be provided in other parts integrated with these,
Further, for example, the shaft portion may be made of a hard steel wire, and a plurality of the cam portions may be formed along the longitudinal direction of the shaft portion by bending the shaft portion.

  Further, for example, the shaft portion may be made of a hard steel member, and the cam portion may be formed so as to extend along the longitudinal direction of the shaft portion integrally with the shaft portion. .

  Further, in this movable table, for example, the operation lever includes a forcible stop mechanism that stops when reaching the movement limit at the movement position, and when the operation lever is at the forcible stop position, the top plate is at the end of the ascent. It is preferable to be configured to be positioned.

The elevating mechanism may be configured to have, for example, a plurality of the operation levers and a link mechanism that is connected to the plurality of operation levers and interlocks the plurality of operation levers.
Further, in the movable table, for example, when the top plate is at the rising end position, the magnet is an external force applied from a finger pinching the operation lever at the forced stop position, and the top plate is It is preferable that a magnetic force that can be easily moved in a free direction with respect to the base is maintained with respect to the base. A design in which the top plate exerts almost no magnetic force on the base is also possible. In this case, at the end of the ascent, the top plate is driven only by gravity to lower the top plate.

  Moreover, although the above description assumes that the base is placed horizontally, there is no problem even if the base is oriented in the vertical direction. In addition, when the base is horizontal, the force for removing the top plate from the base needs to resist gravity and the magnet's attracting force, but when it is vertical, it only needs to resist the magnet's attracting force.

  According to the present invention, the positioning operation can be performed easily and smoothly, the position of the placed sample on the measuring base such as a measuring machine is low, light weight, low center of gravity, simple mechanism and cost However, it is possible to provide an inexpensive movable table.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 3 is a diagram illustrating the movable table in the first embodiment. FIG. 3 shows a plan view of the movable table in the upper left, a front view in the lower left, a side view in the right, and a shaft taken out from the plan view in the left center and a cam integrated with the shaft.

The movable table 8 shown in FIG. 3 is shown as an example of what is used by being installed on a measurement base made of steel or iron, such as a measuring machine (not shown) that measures a sample.
The movable table 10 is fixed to the top plate 11 and the bottom surface of the top plate 11 and is attracted to the measurement base of the measuring machine, and the magnet 12 fixes the top plate 11 in parallel to the measurement base. An elevating mechanism 13 is provided for elevating the top plate 11 with respect to the measurement base of the measuring machine as indicated by an arrow a or an arrow b.

  The top plate 11 is measured by a measuring machine when, for example, a technician who creates a denture based on a tooth shape taken from a patient by a dentist accurately measures the tooth shape in order to produce a high-quality denture. It is installed on a base for use and used as a mounting table for measurement samples.

  For such applications, the top plate 11 includes a sample fixing device for mounting and fixing a measurement sample such as a tooth mold. However, although the container and the frame can be fixed, the entire measurement data cannot always be fixed, and this case is particularly problematic.

  As shown in the upper left of FIG. 3, the sample fixing device includes a fastener mounting screw hole 14, a fastener mounting preliminary screw hole 15, which are respectively formed at two corners on the back of the top surface of the top plate 11 (left side in the figure). A measurement sample fastener 16 (lower left in FIG. 3) fixed by being screwed into these screw holes, and a measurement sample fixing screw 17 on the front surface of the top plate.

A measurement sample placed on the top plate 11 is clamped from three sides by two measurement sample fasteners 16 and a measurement sample fixing screw 17 and fixed on the top plate 11.
In this example, the magnet 12 is composed of a ferrite magnet plate having substantially the same size as the top plate 11. However, the arrangement shape of the magnet 12 is not limited to this. For example, when the magnet's attractive force is too large, a ferrite magnet plate having a small area may be appropriately used.

  In this example, the ferrite magnet plate contacts the measurement base, but the shape is not limited to this. For example, as a modification of this example, as shown in FIG. 4, the top plate 11 is in contact with the measurement base via the guide groove plate or the holding plate, and the ferrite magnet plate is slightly separated from the measurement base. You may arrange.

  FIG. 4 shows a plan view of the movable table of the modified example at the upper left, a front view at the left third stage, and a side view toward the right center. Furthermore, the shaft extracted from the plan view and the cam integrated with the shaft are shown in the second stage on the left, and an enlarged view showing the positional relationship between the base and the magnet is shown in the lower left (enlarged view of the AA ′ section in the plan view). A partially enlarged view of the side view is shown on the right.

  4, components different from those in FIG. 3 are given new reference numerals different from those in FIG. 3, and the configuration or function shown in FIG. 4 is the same as the configuration or function shown in FIG. 3. 3 shows the same numbers as those in FIG. 3 so that they can be compared with those in FIG.

As shown in FIG. 4, in this modification, the guide groove plate 34 is in close contact with the bottom surface of the top plate 11, and the pressing plate 35 that holds the shaft 21 from below is disposed on the lower surface thereof.
A rotation shaft guide groove hole 23 is formed in the guide groove plate 34, and a relief portion 24 of the cam portion 22 is formed in the guide groove plate 34 and the holding plate 35.

  As shown in the lower left of FIG. 4, when the top plate 11 is fixed in contact with the measurement base 36 via the guide groove plate 34 and the pressing plate 35, the N pole disposed in the magnet storage portion 37. The magnet 12 composed of 38 and the S pole 39 is disposed so as to be separated from the measurement base 36 by a minute amount h (in other words, retracted from the lower surface of the pressing plate 35).

According to the modified example shown in FIG. 4, the manufacturing cost increases, but the shape durability of the magnet increases.
Returning to FIG. 3 (FIG. 4 is also substantially the same except for the above-described deformation portion), the elevating mechanism 13 includes at least two operation levers 18. The two operating levers 18 rotate between an open position F and a moving position M as shown on the right side in FIG.

  These operating levers 18 are integrally provided with a shaft portion 21 at one end 19 thereof. The shaft portion 21 rotates in the reverse direction within the rotation angle according to the rotation of the operation lever 18.

A hard steel wire is used for these shaft portions 21 in this example. The shaft portion 21 is integrally formed with a cam portion 22.
As shown in the upper left and center of FIG. 3, the cam portion 22 is formed in the shaft portion 21 by bending a shaft portion 21 made of hard steel wire (in this example, two for each shaft portion 21).

The cam portion 22 projects from the shaft portion 21 toward the inside (center side) of the top plate 11.
In this example, these cam portions 22 are always in contact with the top plate installation surface of the measurement base of the measuring machine on which the top plate 11 is installed by gravity, and have a structure that is free from backlash in operation.

  Then, as shown on the right side of FIG. 3, these cam portions 22 correspond to the forward and reverse rotations of the shaft portion 21 interlocked with the rotation between the movement position M and the open position F of the operation lever 18. With respect to the measurement base, the top plate 11 is rotated between a position U for raising and a position D for lowering as shown by arrows a and b.

The elevating mechanism 13 has a rotation shaft guide slot 23 for guiding the rotation of the shaft portion 21 and a relief portion 24 for the cam portion 22.
The rotation shaft guide slot 23 accommodates the shaft portion 21 and guides its rotation so that a positional shift does not occur when the shaft portion 21 rotates.

The escape portion 24 constitutes a escape place when the cam portion 22 is in a standby position rotated to a position D where the top plate 11 is lowered.
The rotary shaft guide slot 23 and the relief portion 24 may be formed on the top plate 11, may be formed on the magnet 12, or may be formed on both the top plate 11 and the magnet 12. It may be made to carry out, and may be arranged in other parts united with top plate 11.

Further, the operation lever 18 is provided with a forced stop mechanism that reaches the movement limit at the movement position M and is forcibly stopped.
In the example shown in the upper left and right of FIG. 3, when the two operating levers 18 are moved in the movement position M direction, they are brought into contact with both side surfaces of the measurement sample fixing screw 17 and forcibly stopped.

Thus, when the operation lever 18 is in the forced stop position (= movement position M), the top plate 11 is positioned at the end of the ascent.
Further, the magnetic force of the magnet 12 decreases as it moves away from the measurement base, but when the top plate 11 is at the rising end position, the top plate 11 can be easily moved in any direction with respect to the measurement base. It is designed to maintain the magnetic force of the instrument with respect to the measurement base.

  That is, even when the top plate 11 is at the end position of the ascent, the top plate 11 can be easily moved by picking the operation lever 18 at the forced stop position (= moving position M) with a finger. A weak magnetic force is maintained from the magnet 12 toward the measurement base.

  As described above, the lifting mechanism 13 moves the magnet 12 by rotating the cam portion 22 from the lowered position D to the raised position U according to the movement of the operation lever 18 from the open position F to the moving position M by a human finger. The top plate 11 is raised from the measurement base in the direction indicated by the arrow a against the attracting force to the measurement base due to the magnetic force.

  In addition, since the movable table is moved up by the cam and the movement of the movable table is smooth and level, the inconvenience that the position of the sample is changed excessively as in manual separation does not occur.

  The magnetic force acting between the magnet 12 and the measurement base is strong enough to prevent the top plate 11 from falling off the measurement base, and the operation lever is fixed at the moving position M. It is weak enough that the top plate 11 can be freely moved in a desired direction with a finger pinched by 18.

The magnetic force formed between the magnet 12 and the measurement base can be easily adjusted by adjusting the size of the protruding portion of the cam portion 22.
Further, when the operation lever 18 is configured to have a longer shape, the magnet 12 resists the strong adsorption force to the measurement base generated by the magnet 12 on the entire top plate 11 without applying a strong force to the fingertip. Thus, the top plate 11 can be easily lifted to the rising end position.

In this state, if the top plate 11 is moved in a desired direction with a finger while the operation lever 18 is pinched at the fixed position of the movement position M, the tip of the cam portion 22 slides on the surface of the measurement base.
Therefore, the top plate 11 can be freely moved with the fingertip while the lower surface of the top plate 11 is maintained parallel to the upper surface of the measurement base.

Thereby, the measurement sample on the top plate 11 can be arranged at a predetermined measurement position. When the alignment is completed, the operation lever 18 is released from the knob.
Then, the top plate 11 descends toward the measurement base by gravity and the attracting force of the magnet 12 from the predetermined ascending position, and when the top plate 11 contacts the measurement base, the magnetic force acting from the magnet 12 becomes the strongest, and the top plate 11 is firmly fixed to the measurement base.

  As described above, when the movable table 10 of the present invention is used, it is easy and smooth to lift the movable table 10 firmly fixed to the measurement base from the measurement base simply by pinching the operation lever 18. The top plate 11 can be moved and aligned with a fingertip in a short time while maintaining the suction force to the measurement base with a weak magnetic force.

  Further, in the configuration of the movable table 10 of the present invention, the height from the measurement base on the top surface on which the measurement sample of the top plate 11 is placed and fixed is only the thickness of the top plate 11 and the thickness of the magnet 12. Therefore, the state close to the surface of the measurement base is maintained.

Therefore, even when the measurement base of the measuring machine has a rotation function, the eccentric error of the rotation of the measurement base hardly increases, so the measurement sample can be measured with high accuracy. It becomes possible.

In addition, this example is lighter than the conventional movable table shown in FIG. 1 and has a low center of gravity, so that the couple of forces applied to the rotating shaft of the measurement base is significantly reduced.
This leads to a reduction in the temporal error of the rotational drive system of the measurement base, and greatly contributes to maintaining the accuracy of the measurement data.

  FIG. 5 is a diagram showing a movable table in the second embodiment. When the configuration or function shown in FIG. 5 is the same as the configuration or function shown in FIG. 3, the same numbers as those in FIG. 3 are given. In FIG. 5, the illustration of the sample fixing device is omitted.

As shown in FIG. 5, in the movable table 25 of this example, a substantially spherical stagnation portion 26 is integrally attached to the operation lever 18 at the head of the operation lever 18 shown in FIG. 3.
Due to the presence of the stagnation portion 26, when the two operation levers 18 are pinched by the fingertips and the operation lever 18 is moved in the movement direction indicated by the arrows c and d, the fingertips slip through the two operation levers 18 upward. It is possible to prevent the possibility of malfunction.

  Further, the presence of the stagnation portion 26 allows the fingertip that pinches the operation lever 18 to be well fixed to the operation lever 18 below the stagnation portion 26. Therefore, the alignment work after the top plate 11 is lifted from the measurement base of a measuring machine (not shown) can be performed more easily.

  Note that the forcible stop mechanism in this example also serves as the stagnation portion 26, and the operation lever 18 is forcibly stopped when the two stagnation portions 26 come into contact with each other at the center of the front surface of the top plate 11.

  FIG. 6 is a diagram illustrating a movable table according to the third embodiment. When the configuration or function shown in FIG. 6 is the same as the configuration or function shown in FIG. 3 or FIG. 5, the same reference numerals as those in FIG. 3 or FIG. In FIG. 6, the illustration of the sample fixing device is omitted.

The operating lever 18 of the movable table 27 in this example is arranged so as to intersect in an X shape at the open position shown in FIG.
Further, the cam portion 22 formed on the shaft portion 21 integral with these operation levers 18 protrudes toward the outside of the top plate 11 with respect to the shaft portion 21.

  When the operating lever 18 is pinched with a finger and moved in the moving direction indicated by the arrows e and f, the shaft portion 21 integrated with the operating lever 18 is the case of the movable tables 10 and 25 of the first and second embodiments. And rotate in the opposite direction.

And with this rotation, the cam part 22 rotates, the surface of the measurement base is pushed, and the top plate 11 is lifted from the measurement base.
Since the operation lever 18 of the present example is arranged so as to intersect in the X shape at the open position, the fingertip that pinches the tips of the two operation levers 18 is always pushed outward and diagonally downward outside the operation lever 18. It becomes.

Therefore, when the tip of the operation lever 18 is pinched with the fingertip and the operation lever 18 is moved in the moving direction indicated by the arrows e and f, the fingertip does not slip out of the operation lever 18.
In addition, since the fingertip that pinches the tips of the two operating levers 18 is always outside the operating lever 18, the finger constitutes the movement limit of the operating lever 18. There is no need to provide a stopper for the operating lever 18.

  In addition, since the cam portion 22 protrudes toward the outside of the top plate 11 with respect to the shaft portion 21, the cam portion 22 is measured outside the shaft portion 21, that is, in a wider range than the shaft portion 21. The top board 11 is lifted from the measurement base by pushing the surface of the base.

  This is because the four cam portions 22 are in contact with the measurement base outside the shaft portion 21, that is, in a wider range than the movable tables 10 and 25 of the first and second embodiments. The fulcrum by the part 22 will spread rather than the case of 1st and 2nd embodiment.

Since the fulcrum by the four cam portions 22 is thus expanded, the posture of the top plate 11 in the alignment in a state where the top plate 11 is lifted from the measurement base is more stable.
In this model, the position of the lever relative to the top plate can be lowered compared to the model shown in FIG. 5 by appropriately designing the shape of the lever and cam, and the shaft axis position. It has the feature that it can.

  FIG. 7 is a diagram illustrating an example of an elevating mechanism used for the movable table in the fourth embodiment. When the configuration or function shown in FIG. 7 is the same as the configuration or function shown in FIG. 3 or FIG. 5, the same numbers as those in FIG. 3 or FIG. FIG. 7 shows only one configuration of one set constituting the lifting mechanism.

As shown in FIG. 7, in the configuration of the lifting mechanism of this example, the operation lever 18 and the shaft portion 21 fixed to the lower end portion of the operation lever 18 are made of a hard steel member.
Two cam portions 22 are formed along the longitudinal direction of the shaft portion 21 integrally with the shaft portion 21 by the same hard steel member. Note that the number of cam portions 22 may be three or more.

  Since the lifting mechanism of this example is entirely made of a hard steel member, the structure is robust and can be used for a larger movable table.

  FIG. 8 is a diagram illustrating an example of an elevating mechanism used for the movable table in the fifth embodiment. If the configuration or function shown in FIG. 8 is the same as the configuration or function shown in FIG. 7, the same numbers as those in FIG. 7 are given. Further, FIG. 8 shows only one set of components that constitute the lifting mechanism.

  In the configuration of the lifting mechanism of this example shown in FIG. 8, the operation lever 18, the shaft portion 21 fixed to the lower end portion of the operation lever 18, and the cam portion 22 formed integrally with the shaft portion 21 are It consists of a hard steel member.

One cam portion 22 is formed so as to extend along the longitudinal direction of the shaft portion 21.
As described above, even one cam portion extends so as to extend along the longitudinal direction of the shaft portion 21, so that the function as a cam is the same as that of the lifting mechanism in the fourth embodiment shown in FIG. 7. It is the same.

  That is, the lifting mechanism of this example is also made of a hard steel member, so that the structure is sturdy and can be used for a larger movable table.

By the way, when the movable table becomes a large table that spreads more horizontally, it may be difficult to design an operation lever that can be easily grasped with a finger in the embodiments 1 to 5 in terms of dimensions.
However, even such a case can be dealt with by adopting a link mechanism. This will be described below as a sixth embodiment.

In FIG. 9, the example of the raising / lowering mechanism used for the movable table in 6th Embodiment is shown. FIG. 9 is a view of the movable table of this example viewed from the same direction as the side view shown on the right side of FIG.
If the configuration or function shown in FIG. 9 is the same as the configuration or function shown in FIG. 3 or FIG. 5, the same reference numerals as those in FIG. 3 or FIG. In FIG. 9, the sample fixing device is omitted.

  The elevating mechanism 13 shown in FIG. 9 has three operating levers 18 and a link mechanism that is connected to the three operating levers 18 and interlocks the three operating levers 18. Although three types of operating levers are illustrated here, if the movable table is small, the two operating levers can be operated sufficiently smoothly.

  The link mechanism includes a connecting bar 28 and a support member 29. The support member 29 slidably supports one end portion of the connecting bar 28 by a support portion 31 at the upper end, and the connecting bar 28 is supported by the support portion 31 so that the connecting bar 28 advances and retreats in the horizontal direction as indicated by a double arrow g in the figure. To do.

  The position of the connecting bar 28 shown in FIG. 9 is a position when moved in the moving direction from the open position. The three operating levers 18 that engage with the engaging portions 32 of the connecting bar 28 are rotated to the right in the drawing in conjunction with the movement of the connecting bar 28 to the right in the drawing.

  As a result, the cam portion 22 formed on the shaft portion 21 rotates downward from the escape portion (see the top left plan view of FIG. 3), and the tip protrudes from the lower surface of the magnet 12, not shown. The surface of the measuring base of the measuring machine is pushed to lift the top plate 11 from the surface of the measuring base.

  In this way, when the movable table is a large table that is more horizontally spread, three or more operation levers 18 (three in the figure of this example, but may be four or more) are equally provided on the movable table. The shaft portion 21 and the cam portion 22 are disposed.

  In the case of this example as well, the above-described first to fifth factors such as the ease of operation and the high accuracy with which the top plate 11 is at a low position with respect to the surface of the measurement base and there is no fear of expansion of the eccentric error, etc. There is no difference from the case of the embodiment.

It is a figure which shows the example of the movable table for the conventional position alignment. It is a figure which shows the other example of the conventional movable table for position alignment. It is a figure which shows the movable table in 1st Embodiment. It is a figure which shows the modification of the movable table in 1st Embodiment. It is a figure which shows the movable table in 2nd Embodiment. It is a figure which shows the movable table in 3rd Embodiment. It is a figure which shows the example of the raising / lowering mechanism used for the movable table in 4th Embodiment. It is a figure which shows the example of the raising / lowering mechanism used for the movable table in 5th Embodiment. It is a figure which shows the example of the raising / lowering mechanism used for the movable table in 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable table 2 X direction moving stand 3 Y direction moving stand 4 X direction fixed stand 5 Screw 6 Y direction fixed stand 7 Screw 8 Movable table 9a Top plate 9b Magnet 9c Fastening attachment screw hole 9d Fastening 9e Measurement sample fixing screw 10 Movable table 11 Top plate 12 Magnet 13 Elevating mechanism 14 Fastener mounting screw hole 15 Fastener mounting preliminary screw hole 16 Measurement sample fastener 17 Measurement sample fixing screw 18 Operation lever 19 One end 21 Shaft portion 22 Cam portion 23 Rotating shaft guide groove hole 24 Escape part 25 Movable table 26 Rubbing part 27 Movable table 28 Connecting bar 29 Support member 31 Support part 32 Engagement part

Claims (4)

A movable table installed on a base made of steel or iron, positioned by manual movement to a predetermined position with respect to the base, and fixed to the base after positioning,
With the top plate,
A magnet fixed to the bottom surface of the top plate and adhering to the base, thereby fixing the top plate to the base;
A mechanism that lifts the top plate from the fixed base against the magnet attracting force, or the magnet attracting force and gravity, and the magnet attracting force, gravity, or The mechanism further includes a mechanism for lowering the top plate from a predetermined ascending position by both the magnet attracting force and gravity, and fixing the top plate to the base by the action of the magnet attracting force.
At least two operating levers each pivoting one point between the open position and the moving position;
A shaft portion that is disposed integrally with the operation lever and rotates in the forward and reverse directions within the rotation angle according to the rotation of the operation lever;
The top plate is formed integrally with the shaft portion, abuts on a top plate installation surface of the base on which the top plate is installed, and the top plate is attached to the base in response to the forward and reverse rotation of the shaft portion. A cam portion that rotates to a position to be raised or lowered with respect to the position;
An elevating mechanism having
A movable table characterized by comprising:   A rotary shaft guide slot formed on the top plate, on the magnet, or on both the top plate and the magnet, for guiding the rotation of the shaft portion; and a relief portion serving as a standby position for the cam portion; The movable table according to claim 1, further comprising:   The operation lever includes a forcible stop mechanism that stops upon reaching the movement limit on the movement position side, and the top plate is positioned at the end of ascent when the operation lever is in the forcible stop position. The movable table according to claim 1. When the top plate is at the end position of the ascent, the magnet is an external force applied from a finger pinching the operation lever at the forced stop position, and the top plate is free to move with respect to the base. The movable table according to claim 3 , wherein a magnetic force that is easily movable is maintained with respect to the base.