JPH0627026Y2 - Transducer moving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a converter moving device suitable as a moving device of a magnetic head in a floppy disk device, and more specifically, to a rotary motion by engagement of a lead screw and a pin. The present invention relates to a device for converting a carriage into a linear motion and moving a carriage.

[Prior Art] In a floppy disk drive, it is also known to use a lead screw to move a head carriage, and to mesh a lead screw with a needle pin to convert rotational movement into linear movement. Further, it is disclosed, for example, in Japanese Patent Application Laid-Open No. 58-128054 that a spring member is provided between a guide rod for guiding the carriage in the radial direction of the disk and the carriage to prevent backlash.

[Problems to be Solved by the Invention] By the way, it is necessary to prevent rattling between the lead screw and the pin and rattling between the guide rod and the carriage. The prevention of backlash is achieved by disposing a spring member such as a leaf spring between the carriage and the lead screw and between the guide rod and the carriage.

However, it has been found that the effect of backlash prevention varies depending on the location of each spring member. That is, the direction of the force applied to the carriage by the spring member for engaging the pin with the lead screw and the direction of the force applied to the carriage by the spring member for preventing the play between the guide rod and the carriage are mutually different. In the opposite case, the action and effect of each spring member cannot be fully exhibited.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a converter moving device capable of effectively preventing rattling between a lead screw and a pin and rattling between a guide rod and a carriage.

[Means for Solving the Problems] In order to solve the above problems and achieve the above object, the present invention is directed to moving a transducer in a radial direction of a recording medium disk and supporting the transducer. And a carriage for guiding the carriage in the radial direction of the disk, the carriage being disposed so as to extend along the moving direction of the carriage, and being inserted into a through hole provided on one side of the carriage. A guide rod, a lead screw disposed on the other side of the carriage and extending substantially parallel to the guide rod, a motor coupled to the lead screw, and rotation of the lead screw. A pin that engages with the lead screw and that is attached to the carriage to convert movement into linear movement of the carriage; Applying a force in the direction of pressing the pin to the screw through the carriage, and applying a force having a directivity orthogonal to the radial direction in a plane parallel to the main surface of the disk to the carriage. And a first spring member disposed between the lead screw and the carriage so that the same direction as the force having the orthogonal directionality applied to the carriage by the first spring member The present invention relates to a transducer moving device including a second spring member arranged between the guide rod and the carriage so as to apply a force to the carriage.

[Operation] In the above-mentioned invention, if the force (component force) given to the carriage by the first spring member having the directionality at right angles is F ₁ and the force given to the carriage by the second spring member is F ₂ , The bias force F required between the guide bar and the carriage is F ₁ and F
It can be given as the sum of ₂ .

[Embodiment] Next, a head moving device in a floppy disk device according to an embodiment of the present invention will be described. In FIG.
A turntable 2 is provided for rotating the recording medium disc 1, which is coupled to a motor 3. The magnetic head 4 as a signal converter is attached to the main surface of the carriage 6 via a support sheet 5 having a spring property. The carriage 6 is roughly classified into a central main portion 7 that supports the head 4,
In FIG. 1, the arm portion 8 protruding leftward from the main portion 7
And a guide rod engaging portion 9 protruding rightward from the main portion 7.
Which are integrally molded with synthetic resin.

Reference numeral 10 denotes a guide rod, which is inserted into a rectangular through hole 11 provided in the guide rod engaging portion 9 on one side of the carriage 6 and extends so as to guide the carriage 6 in the radial direction of the disk 1. Both ends are held by the fixtures 12 and 13.

The lead screw 14 extends parallel to the guide rod 10 on the other side of the carriage 6, is coupled to the rotor of the stepping motor 15, and is supported by two bearings 16 and 17.

The steel needle pin 18 meshing with the spiral groove of the lead screw 14 is press-fitted into the arm portion 8 in a direction orthogonal to the lead screw 14 as shown in FIG.

2 to 5 show the relationship between the lead screw 14 and the needle pin 18 and the relationship between the needle pin 18 and the arm 8 in detail. As is clear from FIGS. 3 and 4, the arm portion 8 has a forked end, which is one needle pin holding portion 19 and the other is a stopper portion 20.

The needle pin holding portion 19 has a groove 21 extending in the direction of the need screw 14, and is formed in a U shape.
The pair of walls 22 and 23 of the needle pin holding portion 19 are provided with holes 24 and 25, respectively, in which the needle pin 18 is provided.
Has been press-fitted.

Reference numeral 26 is a spring plate as a first spring member, and one end of the spring plate is in contact with the lead screw 14 with a biasing force in a direction of pressing the lead screw 14 against the needle pin 18. To support the spring plate 26 in a cantilever manner, a hole 27 is provided between the needle pin holding portion 19 and the stopper portion 20, as shown in FIG. Is fixed to the upper surface of the with a screw 28 and a nut 29. A through hole 30 is provided in the arm 8 for fixing the spring plate 26 with the screw 28. Also,
In order to prevent lateral displacement of the spring plate 26 and to increase the strength, the arm portion 8 has rising portions 31 and 32 on both sides. Since the spring plate 26 is inclined with respect to the main surface of the carriage 6, it has a component force in the direction indicated by F ₁ in FIG. That is, the spring plate 26 applies to the carriage 6 a component force in the direction of pressing the pin 18 against the lead screw 14 (direction perpendicular to the main surface of the carriage 6), and the disk in the plane parallel to the plane of the disk 1. A component force F _{1 in} a direction orthogonal to the radial direction is applied to the carriage 6. This component force F ₁ is a force that biases the carriage 6 to the right in FIG.

As shown in FIGS. 1 and 4, a second spring member 33 is provided to prevent looseness between the guide rod 10 and the carriage 6. The second spring member 33 is in contact with the guide rod 10 via a resin pad 34. As shown in FIG. 6, the spring member 33 has a U-shaped portion 35 and an arm portion 36 that is cantilevered here, and the U-shaped portion 35 is a right side portion of the carriage 6, that is, a guide rod engaging portion. It is fitted in the edge portion 38 of the recess 37 provided in 9. The second spring member 33 is not fixed to the carriage 6 by screws or an adhesive, but is held by a plurality of protrusions 39, 40, 41 provided on the carriage 6 as shown in FIG.

The second spring member 33 is arranged between the carriage 6 and the guide rod 10 and applies a force F ₂ indicated by an arrow in FIG. 4 to the carriage 6. What is important here is that the second spring member 33 is arranged on the right side of FIG. 4 instead of the left side of the guide rod 10. As a result, the direction of the biasing force F ₂ given to the carriage 6 by the second spring member 33 and the direction of the component force F ₁ given to the carriage 6 by the spring plate 26, which is the first spring member, become the same, and Power of sum F ₁ + F
₂ acts between the guide rod 10 and the carriage 6. Therefore, if the biasing force F required to prevent looseness between the guide rod 10 and the carriage 6 is not required to give this required biasing force F only by the second spring member 33, This is advantageous in terms of sliding wear and the like.

By arranging the second spring member 33 on the right side of the guide rod 10 in FIG. 4, there is an advantage that the second spring member 33 can be easily mounted by using the edge portion 38 of the recess 37.

[Modification] The present invention is not limited to the above-mentioned embodiment, but can be modified. For example, the needle pin 18 may be arranged below the lead screw 14 and the stopper portion 20 may be arranged above. Further, the first spring member is arranged so that the first spring member applies a force in the opposite direction to the component force F _{1 of} FIG. 4 to the carriage 6, and the second spring member 33 is arranged as shown in FIG. It may be arranged on the left side of the guide rod 33. The spring plate 26 and the second spring member 33 may be supported on both sides. The pin 18 may be arranged along the groove 14 a of the lead screw 14.

[Advantage of the Invention] As is apparent from the above, according to the present invention, it is possible to prevent the play between the guide rod and the carriage by the combination of the first and second spring members. Therefore, the second
The biasing force of the spring member can be weakened.

[Brief description of drawings]

1 is a plan view showing a part of a floppy disk device according to an embodiment of the present invention, FIG. 2 is a side view showing a part of the left side surface of the device of FIG. 1, and FIG. III-III line sectional view of the apparatus, FIG. 4 is an IV-IV line enlarged sectional view of the apparatus of FIG. 1, FIG. 5 is an enlarged plan view showing the relationship between the lead screw and the needle pin, and FIG. It is a perspective view showing a spring member and a part of a carriage. 4 ... Magnetic head, 6 ... Carriage, 10 ... Guide rod, 1
4 ... Lead screw, 18 ... Needle pin, 33 ... Second spring member.

Claims (1)

[Scope of utility model registration request] 1. A transducer for moving a transducer in a radial direction of a recording medium disc, a carriage for supporting the transducer, and a moving direction of the carriage for guiding the carriage in a radial direction of the disc. A guide rod that is disposed so as to extend along the carriage and is inserted into a through hole provided on one side of the carriage; and a guide rod that is disposed on the other side of the carriage and with respect to the guide rod. A lead screw extending substantially in parallel, a motor coupled to the lead screw, a lead screw meshing with the carriage so as to convert rotational movement of the lead screw into linear movement of the carriage, and The attached pin and the force in the direction of pressing the pin against the lead screw are forwarded via the carriage. It is arranged between the lead screw and the carriage so as to give a force to the carriage which has a directivity orthogonal to the radial direction in a plane parallel to the main surface of the disk while being applied to the pin. A first spring member between the guide rod and the carriage so as to apply a force in the same direction as the force having the orthogonal directionality applied to the carriage by the first spring member. And a second spring member disposed on the converter.