JP2522162Y2 - Magnetic scale equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a coaxial magnetic scale device used for a machine tool, for example.

(Prior Art) Conventionally, for example, in a machine tool, a magnetic scale device used for position detection has been developed. Among the magnetic scale devices, a coaxial type device has a linear scale rod fixed in the device body, and a detection head penetrated by the scale rod moves linearly along the scale rod. Is configured. The detection head is supported by a carriage, moves following a movement of, for example, a table of a machine tool coupled to the carriage, and outputs a detection signal corresponding to the amount of movement. That is, the detection head detects the magnetic scale recorded on the scale rod.

By the way, when the detection head moves along the scale rod, for example, when the axis of the scale rod is slightly displaced at the time of attachment, a situation occurs in which a force is applied from the left and right or up and down directions other than the detection direction. I do. For this reason, it is necessary to devise a structure for attaching the detection head to the carriage so that the detection head surely follows the detection direction and moves. Specifically, for example, there is a system disclosed in Japanese Utility Model Publication No. 58-42897. That is, a hemispherical member, its receiving member, and a coil spring are interposed between the carriage and the detection head.

(Problem to be Solved by the Invention) In the coaxial magnetic scale device, a hemispherical member is provided between the carriage and the detection head so that the detection head moves along the detection direction without fail along the scale rod. There is a method in which the receiving member and the coil spring are interposed. However, in such a method, due to the member provided between the carriage and the detection head, the detection head portion eventually becomes large in the length direction of the scale rod, and the effective length of the scale rod is shortened. . In other words, the longer the effective length of the scale rod, the larger the entire device.

An object of the present invention is to provide a magnetic scale device capable of reliably moving a detection head in a detection direction and realizing a reduction in the size of a detection head relative to the effective length of a scale rod. To provide.

[Structure of the Invention] (Means and Action for Solving the Problems) The present invention relates to a coaxial magnetic scale device, which is provided between one end of a carriage penetrated by a magnetic scale and one end of a detection head. An apparatus comprising: a spherical receiving member provided; and a leaf spring member fixed to the carriage so as to contact the other end of the detection head, and provided to press the detection head on the side of the spherical receiving member. is there.

With such a configuration, a leaf spring member is provided on one side of the detection head instead of the spherical receiving member or the like, so that the length of the detection head portion can be relatively shortened.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the structure of a main part of a coaxial magnetic scale device according to the embodiment, FIG. 2 is a sectional view showing the overall structure of the magnetic scale device, and FIG. II-I
It is sectional drawing of I.

As shown in FIG. 2, the present apparatus includes a scale rod 11 having both ends fixed in a main body 10, and a detection head 12 is configured to move along the scale rod 11. The detection head 12 is supported by a carriage 13. When the carriage 13 moves while being coupled to, for example, a table of a machine tool, the carriage 13 follows the movement.

As shown in FIG. 1, the detection head 12 has one end engaged with a spherical washer member 14 (actually, a bush member 12).
through a)). The spherical washer member 14 is attached to one end 13a of the carriage 13 (actually, the support member member 14a
Through). On the other hand, the other end side of the detection head 12 contacts the leaf spring member 15 and is pressed in the direction of the spherical washer member 14. The leaf spring member 15 is attached to the carriage 13. At the other end of the carriage 13, a stopper 13b for supporting the leaf spring member 15 is provided.

With such a structure, for example, when the axis of the scale rod 11 is slightly misaligned at the time of mounting,
When the detection head moves along the scale rod, it can receive a force from the left and right or up and down directions other than the detection direction. In such a case, the detection head 12 is not affected by forces from the left and right or up and down directions other than the detection direction by a so-called universal mechanism composed of a resilient leaf spring member 15 and a spherical washer member 14. , Always follows the movement of the carriage 13. That is, since the contact surface between the spherical washer member 14 pressed by the leaf spring member 15 and the detection head 12 has a planar degree of freedom, the detection head 12 is
Following the movement of 13, no excessive load is applied to the scale rod 11.

Therefore, the detection head 12 always follows the movement of the carriage 13, moves along the scale rod 11, and outputs a detection signal according to the amount of movement. In this case, the other end side is a leaf spring member with respect to the spherical washer member 14 on one end side.
Therefore, the length of the detection head is relatively shortened as compared with the conventional method. For this reason, in the scale rods 11 having the same length, the effective length of the scale rod is relatively increased by shortening the length of the detection head.

[Effects of the Invention] As described in detail above, according to the present invention, in the coaxial magnetic scale device, the detection head can be moved reliably following the detection direction, and the effective length of the scale rod can be increased. , The size of the detection head can be relatively reduced. Thereby, the device of the present invention is useful as a position detecting device of a machine tool or the like, for example, where the mounting space is restricted and the effective length of the scale rod needs to be increased.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a main part of a magnetic scale device according to an embodiment of the present invention, FIG. 2 is a sectional view showing the overall configuration of the magnetic scale device according to the embodiment, and FIG. 2
FIG. 2 is a sectional view taken along the line II-II in FIG. 11: Scale rod, 12: Detection head, 13: Carriage, 14: Spherical washer member, 15: Leaf spring member.

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic scale having a magnetic recording scale formed in a linear shape, a detection head for detecting the magnetic recording scale while being penetrated by the magnetic scale, and moving the detection head along the magnetic scale. And a carriage that supports one end of the detection head via a spherical washer member provided at one end of the carriage,
In the coaxial magnetic scale device configured so that the detection head has a followability to the movement of the carriage, a member provided on the carriage, wherein the spherical surface contacts the other end of the detection head. A magnetic scale device comprising a leaf spring member for pressing the detection head in a direction of a washer member.