JPH0310187B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a floppy disk device, and more specifically, a carriage equipped with a magnetic head is moved, and a magnetic head is applied to a track on the floppy disk. This invention relates to an improvement in a head/carriage positioning mechanism for adjusting the position of a head.

[Prior art]

As a head/carriage positioning mechanism for a floppy disk device, the configuration shown in FIG. 1 has been well known. In FIG. 1, reference numeral 7 denotes a carriage equipped with a magnetic head, and this carriage 7 is provided so as to be able to slide back and forth as shown by an arrow 13 by a linear guide mechanism consisting of two guide shafts 9 and 10. .

A belt 4 is stretched between the drive pulley 2 and the driven pulley 3 along the sliding direction of the carriage 7. The drive pulley 2 is rotated in forward and reverse directions as indicated by an arrow 11 by a drive motor 1 such as a stepping motor. A tension spring 5 is attached to the driven pulley 3 to apply appropriate tension to the belt 4.

One straight portion of the belt 4 between the pulleys 2 and 3 is fixed to one side of the carriage 7 by a fixing screw 8. Pulley 2 by motor 1
When the belt 4 is rotated as shown by the arrow 11, the belt 4 moves as shown by the arrow 12, and the carriage 7 moves as shown by the arrow 13 along the guide shafts 9 and 10.

Further, 14 is a slider attached to the protruding end of a leaf spring 14 attached to the side of the carriage 7, and the slider 15 is constantly pressed against the surface of the guide shaft 10 by the elastic force of the leaf spring 14. ing. In other words, the slider 15 constitutes a friction damper that utilizes the frictional force with the guide shaft 10, and plays the role of generating an appropriate static force against the carriage 7.

In the above configuration, movement and positioning of the carriage 7 is controlled by controlling rotation and stopping of the motor 1. However, the slider 15 provided to quickly stop the carriage 7
However, this was one of the causes of positioning errors of the carriage 7. In other words, a residual frictional force is generated between the slider 15 and the guide shaft 10, and this acts as a torque on the drive motor 1, causing the drive motor 1 to come to a standstill with a slight deviation from the predetermined rotation angle. Carriage 7 does not come to rest at the correct positioning point,
This results in a positional error between the magnetic head 6 and the track on the floppy disk (not shown).

[Summary of the invention]

This invention was made in view of the above-mentioned conventional problems, and by interposing an air damper that utilizes the relative movement of both the carriage and a suitable stationary member, the above-mentioned residual frictional force is applied to the drive motor. The purpose of the present invention is to propose a head/carriage positioning mechanism for a floppy disk device that eliminates residual torque and enables quick and accurate positioning of the carriage.

[Embodiments of the invention]

FIG. 2 shows an embodiment of the present invention, which includes a drive motor 1, a drive pulley 2, a driven pulley 3, a belt 4, a tension spring 5, a magnetic head 6,
Carriage 7, fixing screw 8, guide shafts 9 and 1
The configuration of 0 is the same as the conventional one shown in FIG. That is, by driving and stopping the belt 4 via the motor 1 and pulley 2, the movement and positioning of the carriage 7 is controlled.

In this invention, an air damper consisting of a cylinder 16 and a piston 17 is interposed between the carriage 7 and a suitable stationary member. In this embodiment, the carriage 7 is formed with a cylinder 16 whose axis is parallel to its direction of movement, and a piston 17 mounted in the cylinder 16 on a stationary member.
are mated. When the carriage 7 moves in the direction of arrow 13, the piston 17 moves relatively within the cylinder 16, and a braking action by the air within the cylinder 16 is applied to the carriage 7.

With the above air damper, the same effect as the conventional friction damper using the slider 15 can be obtained in terms of quick stopping when positioning the carriage 7, that is, damping characteristics, and of course, this slider 15 is unnecessary. . Furthermore, since no residual frictional force is generated in the air damper, harmful residual torque is not applied to the motor 1 during positioning of the carriage 7, and positioning accuracy is improved.

Note that the mounting positions of the air damper (cylinder 16 and piston 17) are not limited to the illustrated embodiment. Moreover, instead of providing the cylinder 16 in the carriage 7 itself, an independent cylinder 1
6 may be attached to the carriage 7. moreover,
Although the cylinder 16 is provided on the carriage 7 side and the piston 17 is provided on the stationary side in FIG. 2, the same effect can be obtained even if this relationship is reversed.

[Effects of the Invention] As explained in detail above, according to the present invention, by interposing an air damper between the carriage and a suitable stationary member, the carriage can be stopped quickly, and the carriage can be stopped quickly. This has the effect that positioning accuracy can be improved without imparting sometimes harmful residual torque to the drive motor.

[Brief explanation of the drawing]

Figure 1 is a front view showing the head/carriage positioning mechanism of a conventional floppy disk device;
The figure is a front view of a floppy disk device according to an embodiment of the present invention. In the figure, 2 and 3 are pulleys, 4 is a belt, and 6
1 is a magnetic head, 7 is a carriage, 9 and 10 are guide shafts, 16 is an air damper cylinder, and 17 is an air damper piston. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A carriage equipped with a magnetic head is slidably provided by a linear guide mechanism, a belt is stretched between two pulleys along the sliding direction of the carriage, and the belt and the carriage are coupled, Drives the belt through the pulley
A head/carriage positioning mechanism for a floppy disk device, characterized in that an air damper is interposed between the carriage and a suitable stationary member in the mechanism for moving and positioning the carriage by stopping the carriage.