JPS5826329Y2 - Linear scale measuring instrument - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a linear scale type measuring instrument, and in particular, a linear scale, a slider that is engaged with the linear scale in a relatively movable manner and is moved along the linear scale, and a hollow body case in which a linear scale is fixed inside, the slider to which the movement of one of the relative movement members is transmitted from the outside via a connecting means is housed, and the slider is fixed to the other of the relative movement members. Concerning improvements to linear scale measuring instruments.

A linear scale measuring device is a type of length measuring device for measuring or adjusting the relative position of two objects.

This linear scale type measuring instrument is constructed as shown in FIGS. 1 to 3, for example.

In the figure, case 1 is formed by cold drawing pressure.
has a substantially rectangular hollow cross section, is elongated in a direction perpendicular to the plane of the paper of FIG. 1, and further has an opening 2 extending substantially over its entire length along one longitudinal side.

A detection mechanism 3 as a moving member is brought into contact with the opening side end surface of the case 1 via a sliding member 4, and is movable along the longitudinal direction of the case 1.

The arm portion 5 formed on the lower surface of this detection mechanism 3 is connected to the opening 2.
It is extended into case 1.

Further, the case 1 is provided on the outer surface of the case 1 near the opening 2.
A pair of magnets 6 are provided along the longitudinal direction of the case, and a blocking member 7 made of a thin iron plate is attracted to this magnet 6 so as to cover the opening 2, and dust etc. enter into the case 1 from the opening 2. is prevented from doing so.

At this time, the closing member 7 of the portion of the detection mechanism 3 into which the arm portion 5 is inserted is inserted into a side chevron-shaped groove 8 provided in the detection mechanism 3 and having both ends opened on the lower surface of the detection mechanism 3.
The arm portion 5, which is straddled by the groove 8, can be inserted into the case 1.

In the groove 9 provided in the longitudinal direction in the case 1, there is a linear scale 1 made of glass or the like and having vertical striped scales 10A (see FIG. 2) on the - side (scale surface) 10B.
0 is inserted and fixed with adhesive 11 or the like.

The arm portion 6 of the detection mechanism 3 extends to the vicinity of the linear scale 10, and a slider 13 is movably attached to the tip of the arm portion 6 via a connecting means 12.

This connecting means 12 has, for example, a triangular annular portion 1 at its tip.
2A is integrally formed, and the base end is attached to the arm portion 5 with a washer 12B.
and a linear cantilever spring 12D fixed with a screw 12C,
A truncated cone 12E is engaged with the annular portion 12A.

The cantilever spring 12D is configured to press the slider 13 toward the graduation surface 10B of the linear scale 10, which also serves as the first scanning reference surface, and to push the slider 13 perpendicularly to the graduation surface 10B of the linear scale 10. Pressure is also applied to the end surface 10C, which is the second scanning reference surface.

The slider 13 has a contact mounting member 13A formed from a plate material in an oval shape, and is screwed to one bent short side of the contact mounting member 13A, and a scale 10A of the linear scale 10 is formed thereon. A thick light emitting element mounting member 13B facing the non-contact surface and a screw (not shown) fixed to the bent long side of the other end of the contactor mounting member 13A, and attached to the graduation surface 10B of the linear scale 10. It is constituted by a thick light receiving element mounting member 13C facing each other.

An index scale 14 having vertical striped graduations (not shown) similar to the linear scale 10 is fixed to the surface of the contact mounting member 13A of the slider 13 that faces the graduation surface 10B of the linear scale 10. .

A light emitting element 15 as a light source and a light receiving element 1 are placed between the index scale 14 and the linear school 10.
6 are arranged.

At this time, the light receiving element 15 is connected to the L of the contact mounting member 13A.
On the light emitting element mounting member 13B fixed to the short side of the letter,
Two light-receiving elements 16 are fixed to each light-receiving element mounting member 13C fixed to the long side of the L-shape of the contactor mounting member 13A.

The L-shaped inner surface of the contact mounting member 13A, that is, the scale surface 10B which is the first scanning reference surface of the linear scale 10, and the end surface 1 which is the second scanning reference surface orthogonal to this scale surface.
On the surface facing 0C, sliding pieces 17 and 1 each made of a resin with a low coefficient of friction such as polyacetal resin are provided.
A plurality of sliding pieces 8 are fixed, and these sliding pieces 17 and 18 are brought into contact with the graduation surface of the linear scale 10 and the end surface perpendicular to the graduation surface by the biasing force of the cantilever spring 12D.

In such a configuration, when either the case 1 or the detection mechanism 3 as a moving member is attached to the object to be measured and the other is fixed and the object to be measured is moved, the linear scale 10
A bright and dark striped pattern is generated between the scale 10A of the index scale 14 and the scale of the index scale 14, and this striped pattern is read by the light emitting element 15 as a light source and the light receiving element 16 to read the amount of movement of the object to be measured and perform the measurement. It is something to do.

In such conventional linear scale measuring instruments,
Normally, as shown in FIG. 4, side plates 20, which also serve as mounting plates for one of the relatively moving members, are fixed to both end faces of the case 10 with bolts 22, and bolt holes 20A formed in the side plates 20 are used to fix the side plates 20 to both ends of the case 10. By fixing the side plate 20 to one of the relatively moving members, the case 1 is fixed to one of the relatively moving members, while the slider 13 is fixed to the connecting means 12.
, is fixed to the detection mechanism 3 as the other relatively moving member via the arm portion 5 of the detection mechanism 3.

Therefore, in the past, in general, when the slider 13 broke down due to the lifespan of each component, high or middle electronic components, etc., the case 1 was removed from one relative movement member by loosening the bolts (not shown), and then the side plate 20 was removed by loosening the bolts 22. It was necessary to remove the slider 13 from the end face of the case 1, disengage the slider 13 from the linear scale 10, and remove the slider 13 from the case 1.

However, with this method, the mounting position of one relative moving member of the case 1, which is generally mounted with precision adjustment, must be adjusted every time the slider 13 is replaced or overhauled, which is extremely troublesome. Moreover, when the case 1 is attached to the one relative moving member, if the relative position thereof is deviated, there is a problem that the measurement accuracy before the slider replacement cannot be maintained.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and aims to provide a linear scale measuring instrument in which the slider can be removed from the case while the case is fixed to the other relatively moving member. purpose.

The present invention & East A linear scale, a slider that is movably engaged with the linear scale and moved along the linear scale, and the linear school is fixed inside and is relatively movable from the outside via a connecting means. In a linear school measuring instrument comprising a hollow case in which the slider to which the movement of one of the members is transmitted is housed and is fixed to the other relatively moving member, a linear scale longitudinal end face of the case, The above object is achieved by providing a removable cover plate.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 5, in this embodiment, a linear scale measuring instrument similar to the conventional one is provided with a notch 20B in the side plate 20 through which a moving member including a slider 13 can pass. A cover plate 26 that can be covered and is attached and detached using bolts 24 is provided.

In the figure, 28 is a bolt for fixing the closing member 7 to the cover plate 26.

The other points are the same as those of the conventional example, so the explanation will be omitted.

In this embodiment, when it becomes necessary to remove the slider 13 due to a failure or overhaul of the slider, the bolts 24 and 28 are loosened and the cover plate 26 is removed without removing the side plate 20 from the relative movement member. It is possible to remove the slider 13 from the case 1 of the linear scale by simply removing it from the side plate 20.

Therefore, there is no need to adjust the fixing position of the case 1 relative to one of the relatively moving members each time the slider 13 is removed, which is extremely simple.

A second embodiment of the present invention is shown in FIG.

In this embodiment, a mounting stay 30 for fixing the case 1 to one of the relative moving members is fixed to the side surface of the case 1 itself with bolts 31, and is also attached and detached separately from the mounting stay 30. A cover plate 32 which also serves as a side plate is fixed to the end face of the case 1 with bolts 34.

Other points and operations are the same as those in the previous embodiment, so explanations will be omitted.

In each of the above embodiments, the present invention is applied to a linear scale measuring instrument in which the graduation stripes of the index scale are parallel to the graduation stripes of the linear scale, but the scope of application of the present invention is limited to It is clear that the present invention is not limited to this, and can similarly be applied to a moiré stripe measuring instrument in which the graduation stripes of the index scale are arranged at an angle with respect to the graduation stripes of the linear scale.

As explained above, the present invention includes a linear scale, a slider that is movably engaged with the linear scale and moved along the linear scale, and a slider that is fixed inside and connected to the slider through a connecting means. A linear scale measuring instrument comprising a hollow body case in which the slider to which the movement of one of the relative movement members is transmitted from the outside is housed and fixed to the other of the relative movement members, the linear scale of the case Since a removable cover plate is provided on the longitudinal end surface, the slider can be removed from the case while the case is fixed to the other relative moving member. There is no need to readjust the mounting position between the other movable members (thereby, it is possible to remove the slider very easily, which is an excellent effect).

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an example of a conventional linear scale measuring instrument, Figure 2 is a vertical cross-sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view showing an example of a conventional linear scale measuring instrument. − Longitudinal cross-sectional view along the line,
FIG. 4 is a perspective view showing the vicinity of the end in the same conventional example, FIG. 5 is a perspective view showing the vicinity of the end in the first embodiment of the linear scale measuring instrument according to the present invention, and FIG. i,
It is a perspective view showing the vicinity of the end of the second embodiment. DESCRIPTION OF SYMBOLS 1... Case, 3... Detection mechanism as a moving member, 5... Arm, 10... Linear scale, 12... Connection means, 13...
... Slider, 14 ... Index scale, 15 ... Light emitting element, 16 ... Light receiving element, 20 ... Side plate, 26, 32 ...・・・
・Cover plate, 30...Mounting stay.

Claims (1)

[Scope of utility model registration request] a linear scale; a slider that is movably engaged with the linear scale and moved along the linear scale; A linear scale measuring instrument comprising a hollow case in which the slider to which movement is transmitted is housed and fixed to the other relative moving member, wherein a removable cover is provided on a longitudinal end surface of the linear scale of the case. 1. A linear scale measuring instrument, characterized in that a plate is provided so that the slider can be removed from the case while the case is fixed to the other of the relative moving members.