JPH01190252A - Linear motor - Google Patents

Abstract

PURPOSE:To simplify the assembly operation and regulating process of an apparatus by constituting a movement limiting member from a fitting part having a rotational operating part rotatably provided in a part of stator, and a cam part for limiting the maximum moving position or moving quantity of a movable element eccentrically provided in said fitting part. CONSTITUTION:A movement limiting member 5 has a fitting part 5b with a rotational operating part 5c rotatably fitted in a part of stator 1 and a discoidal cam part 5a eccentrically provided in said fitting part 5b. Also, a movable element 6 has contact parts 6a, 6b and a secondary core pole teeth 6c. Said contact parts 6a, 6b contact with the cam part 5a of the movement limiting member 5. Further, when said fitting part 5b is operated to rotate said cam part 5a at an arbitrary angle, it is possible to regulate the maximum moving position of the movable element 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear motor, and particularly to a linear motor used in a magnetic head drive mechanism of a floppy disk device.

[Prior Art] Conventionally, a linear motor used in a magnetic head drive mechanism of this type of floppy disk device has been designed as shown in FIG.

This linear motor includes a stator 1 and a movable element 6.

The stator 1 includes stator components including a primary core (not shown).

The movable element 6 has secondary core Mi8i teeth (not shown), and is movable on the stator 1 in a linear direction.

Further, although not shown, a rolling member is provided between the stator 1 and the movable element 6, which supports the movable element 6 on the stator 1 in a rolling manner and helps the linear movement of the movable element. .

Furthermore, a restriction bin 9 is formed protruding from the stator 1 as a movement restriction member for restricting the maximum movement position of the movable element 6.
The contact portions 6a and 6b that come into contact with the limit pin 9 are the movable member 6.
It is formed.

The movable element 6 is movable within a certain range on the stator 1 via the restriction pin 9 and the contact parts 6a and 6b.

In this case, the restriction pin 9 was in a fixed position.

[Problem to be solved by the invention] In the conventional linear motor described above, the limit pin 9 is in a fixed position on the stator 1, and the maximum movement position or movement amount of the movable element 6 is limited by the parts. It was manufactured at the stage of production and had a structure that did not have an adjustment function, so when used to drive the magnetic head of a floppy disk device, the entire near motor had to be moved and adjusted to align the magnetic head with the media track. The disadvantage is that it is always troublesome.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems of the conventional art. In the linear motor, the linear motor includes a movable element that is movably supported, a movement limiting member of the movable element that protrudes from the stator, and an abutting portion with the movement limiting member that is provided on the movable element. The member includes a mounting part having a rotary operation part rotatably provided on a part of the stator, and a cam part eccentrically provided to the mounting part for limiting the maximum movement position or movement amount of the movable element. It is structured as follows.

[Example] Next, an example of the present invention will be described with reference to the drawings.

1 to 5 are diagrams showing an embodiment of the present invention.

FIG. 1 is a plan view of a linear motor according to an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1.

These FIGS. 1 and 2 show a state in which the movable element 6 has moved to the maximum in the -Y direction.

This linear motor includes a stator 1 and a movable element 6, and the stator 1 is composed of a primary core 2, a drive winding 3, a permanent magnet 4, and a rotationally arranged movement limiting member 5.

The movement limiting member 5 includes a mounting portion 5b with a rotary operation portion 5c rotatably attached to a part of the stator 1, and the mounting portion 5b.
It has a cylindrical cam portion 5a eccentrically provided.

The mover 6 has contact parts 6a, 6b and secondary core magnetic pole teeth 6c.
has. The contact portions 6a, 6b are adapted to come into contact with the cam portion 5a of the movement limiting member 5. Further, a rolling member 7 is provided between the stator 1 and the movable element 6, and this rolling member 7 maintains the gap length between the primary core magnetic pole teeth 2a and the secondary core magnetic pole teeth 6C, and It is designed to help the smooth straight line movement.

The drive current flowing through the drive winding 3 and the primary core magnetic pole teeth 2
The movable element 6 moves linearly in the +Y or -Y direction due to the magnetic interaction between the permanent magnet 4, the permanent magnet 4, and the secondary core magnetic pole tooth 6C. The maximum movement position of the movable element 6 can be adjusted by rotating the cam part 5a by an arbitrary angle by operating the mounting part 5b.

FIG. 3 is a partial plan view showing a state in which the cam portion 5a of the movement limiting member 5 is rotated by 180 degrees from the position shown in FIG. As can be seen by comparing FIGS. 1 and 3, the movable element 6 changes from YO to Yl with reference to the mounting hole 1a.

FIG. 4 is a perspective view of the movement limiting member 5 shown in FIG. 1 seen from below, and FIG. 5 is a bottom view of FIG. has been formed,
The operating portion 5C of the mounting portion 5b is formed as a driver insertion hole.

FIG. 6 is a bottom view of a movement limiting member showing the shape of a cam portion according to another embodiment of the present invention.

This movement limiting member 8 has the cam portion 8a placed at a position approximately symmetrical to an arc A having the same radius, with the cam portion 8a centered around the center point 0 of the mounting portion 8b.
The shape has an arc B whose radius changes in accordance with the change in angle, and by installing the mounting portion 8b on the stator 1 in the same manner as the movement limiting member 5, the maximum movement position of the mover 6 in one direction can be adjusted. The maximum movement position in the opposite direction can be adjusted without changing the
If the movable element 6 is rotated by 180 degrees, the maximum movement position of the movable element 6 can be adjusted in a relationship opposite to that described above.

[Effects of the Invention] As explained above, in the linear motor of the present invention, the movement limiting member has a mounting portion having a rotary operation portion rotatably provided on a part of the stator, and a mounting portion provided eccentrically to the mounting portion. Since it is equipped with a cam part to limit the maximum movement position or movement amount of the mover, when used to drive the magnetic head of a floppy disk device, the outermost position or innermost position of the medium of the magnetic head can be easily adjusted. Since the installation of the linear motor itself does not require highly accurate positioning, the assembly work and adjustment process for the device are not only simplified, but also the positioning accuracy of the magnetic head described above can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a linear motor according to an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 shows a state in which the cam has been rotated 180 degrees from the state in Fig. 1. FIG. 4 is a perspective view of the movement limiting member; FIG. 5 is a bottom view of FIG. 4; FIG. 6 is a bottom view of the movement limiting member showing another embodiment of the present invention; FIG. is a plan view of a conventional linear motor. 1: Stator 5: Movement limiting member 5a:
Cam part 6: Mover 6a, 6b: Contact part 8: Movement limiting member 8a: Cam part

Claims (1)

[Claims] a stator; a movable element supported on the stator so as to be able to roll in a linear direction; a movement limiting member for the movable element that projects from the stator; and a movement limiting member provided on the movable element. In the linear motor, the movement limiting member includes a mounting part having a rotary operation part rotatably provided on a part of the stator, and a mounting part of the movable element provided eccentrically on the mounting part. A linear motor characterized by comprising a cam portion for limiting the maximum movement position or the amount of movement.