JPS6343632Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a carrier drive device for a floppy disk.

Generally, there are various methods for moving the head facing the magnetic sheet in a floppy disk, but among these, a carrier is provided on a linear guide shaft so that it can freely reciprocate, and the head is fixed to this carrier. There is something that did this. There are also methods to drive this carrier, such as those using a cam and those using a lead screw.
There are belt-based systems, etc. Each of these drive methods has advantages and disadvantages, and is selectively adopted depending on the design purpose.

Therefore, in the belt drive method, a belt is stretched around the side surface of the carrier, and this belt is wound around a drive wheel, so that the carrier is fed by the rotation angle of the drive wheel. Although such belts are installed with a predetermined tension in order to obtain driving stability, changes in temperature and humidity can cause elongation and reduce the tension. In order to overcome these drawbacks, conventional belts have been developed in which one end of the belt is fixed and a tension spring is attached to the other end to tension the belt in the direction in which it is stretched. With this configuration, the tension on the belt is always maintained constant, but since the tensioning direction of the spring matches the driving direction of the carrier, a carrier moving force is applied to the spring, and this Therefore, there is a drawback that it is difficult to achieve accurate positioning of the track.

This invention was made in view of the above points, and the object is to obtain a carrier drive device for a floppy disk that can always maintain a constant belt tension and that does not reduce feeding accuracy.

In this invention, a leaf spring that absorbs the elongation of the belt is fixed near the attachment end of the belt so as to be in contact with the surface of the belt, so that the force absorbed by the elongation of the belt is applied in a direction perpendicular to the direction of carrier movement. As a result, the carrier moving force does not act directly on the leaf spring, and the belt tension can be maintained constant while the track position can be maintained with high precision.

A first embodiment of this invention will be explained based on FIGS. 1 and 2. First of all, I will only show one,
Two guide shafts 1 are provided in parallel, and a carrier 2 is attached to the guide shafts 1 so as to be able to slide back and forth. A head 4 is attached to the surface 3 of the carrier 2, which is connected to a magnetic disk (not shown). Further, a belt 6 made of a thin steel plate or the like is stretched and fixed on the side surface 5 of the carrier 2. This belt 6 consists of a single thread part 7 and a continuous thread part 8, and mounting holes 9 and 10 are formed at both ends, and mounting ends 11 and 12 are formed.
It is said that Then, the single thread portion 7 and the double thread portion 8
Another hole 13 is also formed at the boundary between the two holes. Further, a mounting hole 14 is also formed near the mounting hole 9. Therefore, in the portions of the side surface 5 of the carrier 2 where the attachment ends 11 and 12 of the belt 6 are located, grooves 15 are formed so that the width dimensions of these attachment ends 11 and 12 are matched. A guide protrusion 16 is integrally formed. Further, a recess 17 is formed in a portion close to the mounting end 11. The belt 6 is fixed along the side surface 5 by mounting screws 18 inserted into the respective mounting holes 9 and 10. In addition, a plate spring 2 is attached to the mounting hole 14 by a mounting screw 19.
0 is fixed. This plate spring 20 is a pressing part 2
1 is formed as a curved portion, and this pressing portion 21 exists at the position of the recessed portion 17 and presses the belt 6 inward from a direction perpendicular to the surface thereof.

A drive wheel 22 connected to a pulse motor (not shown) is provided on the side of the carrier 2. The belt 6 is wound around the outer peripheral surface 23 of the drive wheel 22, and the belt 6 is inserted into the hole 13. screw 2
4 fixes the belt 6 to the drive wheel 22.

With this configuration, when the drive wheel 22 rotates, the carrier 2 reciprocates along the guide shaft 1 by the belt 6 since the rotation axis of the drive wheel 22 is fixed. At this time, since the belt 6 is pressed by the elastic force of the leaf spring 20, it always maintains a constant tension, and the rotation angle of the drive wheel 22 and the position of the carrier 2, that is, the position of the head 4, are corresponds exactly. Therefore, track accuracy is maintained at an extremely high level.

Next, a second embodiment of this invention will be explained based on FIG. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the side surface 5 of the carrier 2 is not formed with a recess 17 on the side surface 5.
A bent leaf spring 25 is installed between the belt 6 and the belt 6 to press the belt 6 outward. With this, the tension of the belt 6 is always maintained constant,
Moreover, since the position where the leaf spring 25 is attached does not reach the position of the drive wheel 22, no operational problems occur.

This idea consists of a belt stretched along the side of the carrier and wound around the drive wheel as described above, and a leaf spring attached near the end of the belt. Since the contact is made to the surface of the belt, even if the belt stretches, the stretch can be absorbed by the pressing force of the leaf spring, and since the direction of force action at this time is not the direction of action by the drive wheel, There is no positional change when moving the carrier.
It is possible to determine the track position with high precision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a first embodiment of this invention, FIG. 2 is a perspective view of a belt, and FIG. 3 is a perspective view of a second embodiment of this invention. 1...Guide shaft, 2...Carrier, 5...Side surface, 6...Belt, 11, 12...Mounting end, 2
0... Leaf spring, 22... Drive wheel, 25... Leaf spring.

Claims (1)

[Scope of utility model registration request] A belt is stretched along the side surface of a carrier provided on a guide shaft so as to be slidable back and forth, and the belt is wound around a drive wheel connected to a motor, in which the mounting end of the belt is 1. A carrier drive device for a floppy disk, characterized in that a leaf spring for absorbing the elongation of the belt is fixed in contact with the surface of the belt.