JPH07262714A - Magnetic head moving device - Google Patents

Abstract

PURPOSE:To obtain a stable load by diminishing influence caused by variation in dimensions of parts at the time of assembling a head device and to unnecessitate adjustment of the load, by lowering spring constant of leaf spring. CONSTITUTION:A needle 9 is fixed to a carriage 2 at an inclination corresponding to lead angle of screw part of a lead screw 8, and is engaged with screw groove of the screw 8. Thus, the engagement state of the screw 8 with the needle 9 is held by the leaf spring 4a having a low spring constant with a distance between a supporting part and an operating point of the leaf spring, lengthened by providing a fixed end 4b in the remote part from the needle on the carriage 2 and disposing a free beam part on the outer side of the carriage 2. Consequently, by rotating a motor 7, the screw 8 is rotated, and the carriage 2 is guided via the needle 9 by a guide shaft 10 to move linealy, so that recording and reproducing are performed by a magnetic head fixed by the carriage 2 and an arm 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring structure in a magnetic head moving device.

[0002]

2. Description of the Related Art FIG. 13 is a perspective view showing a conventional magnetic head moving device. In the figure, 1 is a recording medium, 2 is a carriage having a magnetic head (not shown) that contacts the recording medium 1 to perform recording and reproduction, and 3 is fastened to the carriage 2 at one end together with a holder 5 via an elastic member 4. Member 6
An arm having a magnetic head at the other end fixed by
Is a motor for driving the front carriage 2, 8 is a lead screw rotated by the motor 7, and 9 is a carriage 2.
Fixed to the lead screw 8 and engaged with the lead screw 8,
Reference numeral a denotes a leaf spring which is bent and fixed to the carriage 2 together with the holder 5 by the fastening member 6 so that the needle 9 is brought into contact with the lead screw 8 at a constant pressure.
The fixed end of the leaf spring 4a, which is the working portion of the carriage 10, the guide shaft 10 for guiding the carriage 2 in a linear motion, and the holder 5
Is a pressure spring that is attached to the arm 3 and contacts the arm 3 with a constant pressure.

Next, the operation of the conventional magnetic head moving device will be described. The needle 9 is fixed to the carriage 2 with an inclination corresponding to the lead angle of the screw portion of the lead screw 8, engages with the thread groove of the lead screw 8, and holds the engaged state by the pressure spring 4a. . Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 10 via the needle 9 engaged with the lead screw to perform a linear movement. After moving to a predetermined position, recording / reproduction is performed by a magnetic head that is in contact with the recording medium 1 and fixed to the carriage 2 and the arm 3.

[0004]

Since the conventional magnetic head moving device is constructed as described above, it has the following problems. Since the distance between the fixed end 4b of the leaf spring 4a and the point of contact with the lead screw 8 is short,
Since the spring constant of the leaf spring 4a is high and the load fluctuates due to variations in component dimensions, it is necessary to adjust the load. When the spring constant of the leaf spring 4a is lowered, it is necessary to increase the deflection amount of the leaf spring 4a in order to generate a predetermined pressing force. When the deflection amount is increased, the leaf spring 4a
Was difficult to attach to the lead screw. Further, since the leaf spring 4a of the elastic member 4 is bent, the die becomes complicated and the die cost becomes high. Further, since the holder 5 and the elastic member 4 are separate parts, it takes time to assemble.

The present invention has been made to solve the above problems, and an object thereof is to obtain an inexpensive magnetic head moving device which does not require adjustment during assembly.

[0006]

A carriage having a magnetic head and moving along a guide, a lead screw driven by a motor to move the carriage, and abutting on a groove of the lead screw, In a magnetic head moving device comprising a needle supported by a carriage so as to transmit a driving force of a lead screw to the carriage and a leaf spring that presses the lead screw and clamps the needle, the leaf spring is placed on the carriage. The distance between the support portion of the leaf spring and the point of action at which the leaf spring abuts the lead screw is set to a predetermined dimension, and the support is provided between the support portion of the leaf spring and the point of action. The section is the only support section.

Further, the leaf spring is supported on the end portion of the carriage, and the leaf spring is arranged so that the outside of the carriage is along the outer contour of the carriage.

Further, a carriage having a magnetic head and moving along a guide, a lead screw driven by a motor to move the carriage, and a groove of the lead screw are contacted to drive the lead screw. In a magnetic head moving device including a needle supported by a carriage for transmitting a force to a carriage and a leaf spring that presses the lead screw and clamps the needle, the leaf spring is supported on the carriage, A notch is provided between the support portion of the leaf spring and the point of action at which the leaf spring contacts the lead screw.

Further, at the time of assembling the magnetic head moving device, a restricting portion for restricting a bending amount of the leaf spring is provided integrally with the carriage before engaging the leaf spring with the lead screw. is there.

Also, a carriage having a magnetic head and moving along a guide, a lead screw driven by a motor to move the carriage, and a groove of the lead screw are contacted to drive the lead screw. In a magnetic head moving device having a needle supported by a carriage for transmitting a force to a carriage and the lead screw, and comprising the needle and a holding leaf spring, the leaf spring is pushed to bend the leaf spring to the lead screw. It is provided with a locking portion that abuts at a constant pressure.

[0011]

In the magnetic head moving device according to the present invention, the distance between the supporting portion of the leaf spring and the point of action for pressing the lead screw is set to a predetermined dimension to secure a low spring constant in the leaf spring, and the needle is attached to the lead screw. Engage.

Further, the fixed end position, which is a supporting portion of the leaf spring, is provided on the opposite side of the needle of the carriage, and the leaf spring is arranged so as to surround the outside of the carriage to secure a low spring constant, thereby pressing the needle. And hold the state in which the needle is engaged with the thread groove of the lead screw.

Further, the leaf spring is provided with a cutout portion to secure a low spring constant to thereby pressurize the needle and keep the needle engaged with the thread groove of the lead screw.

Further, the carriage is provided with a restricting portion for the leaf spring, and when the lead screw is incorporated, the leaf spring is held at a position where it is smoothly incorporated into the lead screw.

Further, the plate spring is formed into a flat plate shape by providing an engaging portion for pressing the plate spring against the lead screw, and the die structure is simplified.

[0016]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, the same reference numerals as those in FIG. 13 showing the conventional example indicate the same or corresponding portions as in the case of the conventional example. Four
b is a fixed end which is a support portion of the leaf spring 4a,
In order to lower the spring constant at the pressing position of a, the fixed end 4b is provided in a direction other than the direction in which the needle 9 is provided, that is, at a position far from the needle of the carriage 2, so that the leaf spring does not contact the carriage, a so-called free beam. The portion is arranged outside the carriage 2.

Next, the operation will be described. Needle 9
Is fixed to the carriage 2 with an inclination corresponding to the lead angle of the thread portion of the lead screw 8, engages with the thread groove of the lead screw 8, and the fixed end 4b is provided in the direction distant from the needle of the carriage 2. Is arranged outside the carriage 2, and the engagement state between the lead screw 8 and the needle 9 is held by the leaf spring 4a having a low spring constant in which the distance between the supporting portion of the leaf spring and the point of action is long. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 10 via the needle 9 engaged with the lead screw 8 to perform a linear movement. After moving to a predetermined position, recording / reproduction is performed by a magnetic head (not shown) fixed to the carriage 2 and the arm 3 that are in contact with the recording medium 1. The distance between the supporting portion of the leaf spring and the point of action for pressing the lead screw is, for example, 0.1 mm when the thickness of the leaf spring is 0.1 mm.
The optimum value is about 20 mm, and there is a considerable effect in the range of 10 mm to 35 mm. If it is 10 mm or less, the effect of lowering the spring constant is small, and if it is 35 mm or more, the load at the point of action becomes insufficient. As described above, the distance between the pressing position of the leaf spring and the fixed end is lengthened so that the spring constant is lowered, so that there is little variation in load and it is not necessary to adjust the load.

Example 2. A second embodiment of the present invention will be described with reference to the drawings. In FIG. 2, the same reference numerals as those in FIG. 13 of the conventional example indicate the same or corresponding portions as in the case of the conventional example. Four
Reference numeral b denotes a fixed end of the leaf spring 4a. In order to reduce the spring constant of the leaf spring 4a at the pressing position, the fixed end 4b is opposite to the direction in which the needle 9 is provided, that is, the guide shaft 10a.
It is provided on the side, and the free beam portion is bent on the lower end of the holder 5 so that the distance between the fixed end 4b, which is the supporting portion of the leaf spring, and the pressing position of the leaf spring 4a is long.

Next, the operation will be described. Needle 9
Is fixed to the carriage 2 with an inclination corresponding to the lead angle of the screw portion of the lead screw 8, engages with the thread groove of the lead screw 8, the fixed end 4b is provided on the guide shaft 10 side, and the free beam portion is held by the holder 5 The main engagement state is maintained by the leaf spring 4a having a low spring constant, which is arranged by bending on the lower side. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 10 via the needle 9 engaged with the lead screw 8 to perform a linear movement. After moving to a predetermined position, recording / reproducing is performed by the magnetic head fixed to the carriage 2 and the arm 3 which are in contact with the recording medium 1. Further, in the above-described embodiment, the case where the free beam portion of the leaf spring 4a is bent and arranged on the lower side of the holder 5 has been described. However, the free beam portion of the leaf spring 4a is bent and processed on the upper side of the holder 5. You may arrange | position, and the same effect as a present Example is produced.

Example 3. A third embodiment of the present invention will be described with reference to the drawings. In FIG. 3, the same reference numerals as those in FIG. 13 of the conventional example indicate the same or corresponding portions in the case of the conventional example.
Reference numeral 4a denotes a leaf spring which is brought into contact with the lead screw 8 of the needle 9 fixed to the carriage 2 together with the holder 5 by the fastening member 6 at a constant pressure. The leaf spring 4a is approximately U in order to reduce the spring constant at the pressing position of the leaf spring 4a. V-shaped notch 4
c is provided.

Next, the operation will be described. Needle 9
Is fixed to the carriage 2 with an inclination corresponding to the lead angle of the screw portion of the lead screw 8 and engages with the thread groove of the lead screw 8 to reduce the spring constant at the pressing position of the leaf spring 4a. U-shaped notch 4c
The main engagement state is maintained by the leaf spring 4a provided with. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 1 via the needle 9 engaged with the main lead screw.
Guided by 0, perform linear movement. After moving to a predetermined position, the carriage 2 and the arm 3 that are in contact with the recording medium 1
Recording and reproduction are performed by the magnetic head fixed to the.
As described above, since the pressing surface of the leaf spring is held and the substantially U-shaped cutout portion is provided on the side portion, the spring constant can be reduced, and the variation of the load is small and the load is adjusted. No need. Further, although the cutout portion 4c has a substantially U shape, the shape is not limited to the U shape, and a cutout portion having a closed shape such as a circular shape may be provided inside the leaf spring.

Example 4. A fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows the carriage 2 of FIG. 1 showing the first embodiment.
A holder 2a is added as a restricting portion for hanging the leaf spring 4a. 5 is a front view of the head moving device as viewed from A before fitting the needle 9 and the leaf spring 4a into the lead screw 8 in FIG. 1 showing the first embodiment.
As described above, since the spring constant at the pressing position of the leaf spring 4a is low in FIG. 1, in order to secure the same pressing force as in the conventional example at the pressing position of the leaf spring 4a, FIG. As shown in the drawing, the deflection amount of the leaf spring 4a is increased, and the needle 9 and the leaf spring 4a are attached to the lead screw 8.
It becomes necessary to lift the tip of the leaf spring 4a when fitting the. Therefore, in the present invention, as shown in FIG. 6, when the needle 9 and the leaf spring 4a are fitted into the lead screw 8, the regulating portion 2a for hanging the leaf spring 4a on the carriage 2 is provided so that it is not necessary to lift the tip of the leaf spring 4a. It was integrated in 2. Further, as shown in FIG. 7, the leaf spring 4a does not contact the regulating portion 2a when the needle 9 and the leaf spring 4 are fitted in the lead screw 8. 6 and 7 are front views of the head moving device of the present embodiment viewed from B in FIG.

Next, the operation will be described. When the needle 9 and the leaf spring 4a are fitted into the lead screw 8, the carriage 2 is provided with the restricting portion 2a for hanging the leaf spring 4a, so that the leaf spring 4a can be fitted in without being lifted. The needle 9 is fixed to the carriage 2 with an inclination corresponding to the lead angle of the screw portion of the lead screw 8, engages with the thread groove of the lead screw 8, and is fixed to the fixed end 4.
b is provided in a direction far from the needle 9 of the carriage 2, and the main engagement state is maintained by a leaf spring 4a having a low spring constant in which a free beam portion is arranged outside the carriage 2. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 10 via the needle 9 engaged with the main lead screw to perform a linear movement. After moving to a predetermined position, recording / reproducing is performed by the magnetic head fixed to the carriage 2 and the arm 3 which are in contact with the recording medium 1. As described above, not only the load need not be adjusted, but also the regulating portion for lifting the leaf spring is provided, so that the leaf spring does not need to be lifted so much during the assembly, and the leaf spring can be easily assembled. .

Example 5. A fifth embodiment of the present invention will be described with reference to the drawings. In FIG. 8, the same reference numerals as those in FIG. 13 of the conventional example indicate the same or corresponding parts as in the case of the conventional example. 5
a is a holder that pushes and bends the leaf spring 4a of the elastic member 4 having a flat plate shape when the elastic member 4 is fixed to the carriage 2 by the fastening member 6 so that the leaf spring 4a can contact the lead screw 8 with a constant pressure. 5 is a locking portion. FIG. 9 shows FIG.
9 is a front view of the elastic member 4 having a flat plate shape as viewed from C before being fixed to the carriage 2 by the fastening member 6 together with the holder 5. FIG. FIG. 10 is a front view of the elastic member 4 having a flat plate shape fixed to the carriage 2 by the fastening member 6 together with the holder 5 as viewed from C in FIG. The locking portion 5a of the holder 5 is in a state in which the plate spring 4a of the elastic member 4 having a flat plate shape is bent. Figure 11
Is a front view seen from C of FIG.
The needle 9 and the leaf spring 4a are fitted in the.

Next, the operation will be described. Needle 9
Is fixed to the carriage 2 with an inclination corresponding to the lead angle of the screw portion of the lead screw 8, engages with the thread groove of the lead screw 8, and can be brought into contact with the lead screw 8 at a constant pressure. The plate spring 4a pressed and bent by the locking portion 5a maintains the main engagement state. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is guided by the guide shaft 1 via the needle 9 engaged with the main lead screw.
Guided by 0, perform linear movement. After moving to a predetermined position, the carriage 2 and the arm 3 that are in contact with the recording medium 1
Recording and reproduction are performed by the magnetic head fixed to the.
As described above, since the plate spring is provided with the locking portion that locks the plate spring so as to press it at a constant pressure, there is little variation in load and it is not necessary to adjust the load. Further, since the leaf spring is flat, the die structure is simple and the die cost can be reduced.

Example 6. A sixth embodiment of the present invention will be described with reference to the drawings. In FIG. 12, the same reference numerals as those in FIG. 13 of the conventional example indicate the same or corresponding parts as in the case of the conventional example.
In FIG. 13 showing a conventional example, the arm 3 is integrally formed with the elastic member 4, and the arm 3 is fixed to the carriage 2 together with the holder 5 which is a separate component by the fastening member 6. In the present invention, the holder 5, which is a separate component, is attached to the elastic member 4.
In the same manner as the arm 3, it is integrally molded.

Next, the operation will be described. A component having a structure in which the arm 3 and the holder 5 are integrally molded on the elastic member 4 is fixed to the carriage 2 by the fastening member 6, and the needle 9 having an inclination corresponding to the lead angle of the thread portion of the lead screw 8 is It is fixed to the carriage 2, is engaged with the thread groove of the lead screw 8, and is held in the main engagement state by the leaf spring 4a. Therefore, when the motor 7 is rotated, the lead screw 8 is rotated, and the carriage 2 is moved through the needle 9 engaged with the main lead screw.
Is guided by the guide shaft 10 to perform a linear movement. After moving to a predetermined position, the recording medium 1 is brought into contact with the carriage 2
Recording and reproduction are performed by the magnetic head fixed to the arm 3. As described above, since the holder and the elastic member are integrally formed, it is not necessary to adjust the load, and the assembling time is shortened.

[0028]

As described above, according to the present invention, since the spring constant of the leaf spring is made low, a stable load can be obtained with little influence due to the variation in the parts dimensions when the head device is assembled. No adjustment is required.

Further, since the leaf spring and the carriage are arranged in the direction of the needle along the outside of the carriage, the load can be adjusted easily as described above, and the component arrangement surface of the carriage can be used rationally.

Since the leaf spring is provided with the notch,
It is not necessary to increase the size of the leaf spring, the spring constant of the leaf spring can be reduced, and the load at the point of action of the leaf spring can be adjusted easily.

Further, since the restricting portion of the leaf spring is provided, the lead screw can be easily assembled into the needle and the leaf spring.

Further, since the leaf spring can be formed into a flat plate shape by pushing and bending the leaf spring at the engaging portion and contacting the lead screw, the die structure can be simplified and the die cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head moving device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a magnetic head moving device according to a second embodiment of the invention.

FIG. 3 is a perspective view showing a magnetic head moving device according to a third embodiment of the invention.

FIG. 4 is a perspective view showing a magnetic head moving device according to a fourth embodiment of the invention.

5 is a front view of the magnetic head moving device of FIG. 1 seen from A in FIG. 1 before fitting a needle and a leaf spring into a lead screw.

6 is a front view of the magnetic head moving device of FIG. 4 seen from B in FIG. 4 before fitting a needle and a leaf spring into a lead screw.

FIG. 7 shows the magnetic head moving device of FIG.
It is the front view seen from.

FIG. 8 is a perspective view showing a magnetic head moving device according to a fifth embodiment of the invention.

9 is a front view of the magnetic head moving device of FIG. 8 before the elastic member having a flat plate shape is fixed to a carriage together with a holder by a fastening member as viewed from C in FIG. 8;

10 is a front view of the magnetic head moving device of FIG. 8 in which a plate-shaped elastic member is fixed to a carriage together with a holder by a fastening member as viewed from C in FIG.

FIG. 11 shows the magnetic head moving device of FIG. 8 in FIG.
It is the front view seen from.

FIG. 12 is a perspective view showing a magnetic head moving device according to a sixth embodiment of the present invention.

FIG. 13 is a perspective view showing a conventional magnetic head moving device.

[Explanation of symbols]

 1 Recording Medium 2 Carriage 2a Regulation Part 3 Arm 4 Elastic Member 4a Leaf Spring 4b Fixed End 4c Notch Part 5 Holder 5a Engagement Part 6 Fastening Member 7 Motor 8 Lead Screw 9 Needle 10 Guide Shaft 11 Pressure Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tamayama, etc. 2-25 Sakaemachi, Koriyama City Mitsubishi Electric Corporation Koriyama Factory (72) Inventor Shoji Tatehata 2-25, Sakaemachi Koriyama City Mitsubishi Electric Corporation Koriyama In-house (72) Inventor Yasuhiko Suzuki 2-25 Sakaemachi, Koriyama-shi Mitsubishi Electric Engineer Ring Co., Ltd. Kamakura Plant Koriyama Branch

Claims (5)

[Claims] 1. A carriage that has a magnetic head and moves along a guide, a lead screw driven by a motor to move the carriage, and a drive of the lead screw that abuts on a groove of the lead screw. Press the needle supported by the carriage to transmit the force to the carriage and the lead screw,
In a magnetic head moving device including the needle and a leaf spring that holds the leaf spring, the leaf spring is supported on the carriage, and between a support portion of the leaf spring and an action point at which the leaf spring abuts the lead screw. A magnetic head moving device, characterized in that the distance is set to a predetermined dimension, and that the support portion is the only support portion between the support portion of the leaf spring and the point of action. 2. A magnetic head moving device according to claim 1, wherein a leaf spring is supported on an end portion of the carriage, and the leaf spring is arranged so that an outer side of the carriage is along an outer contour of the carriage. . 3. A carriage that has a magnetic head and moves along a guide, a lead screw driven by a motor to move the carriage, and a groove that is in contact with the lead screw to drive the lead screw. Press the needle supported by the carriage to transmit the force to the carriage and the lead screw,
In a magnetic head moving device provided with the needle and a leaf spring that holds the leaf spring, the leaf spring is supported on the carriage, and between a support portion of the leaf spring and an action point where the leaf spring abuts the lead screw. A magnetic head moving device having a cutout portion. 4. When the magnetic head moving device is assembled, a regulating portion for regulating the amount of deflection of the leaf spring is provided integrally with the carriage before engaging the leaf spring with the lead screw. Item 4. The magnetic head moving device according to any one of Items 1 to 3. 5. A carriage having a magnetic head, which moves along a guide, a lead screw driven by a motor to move the carriage, and a groove that is in contact with the lead screw to drive the lead screw. Press the needle supported by the carriage to transmit the force to the carriage and the lead screw,
In a magnetic head moving device including the needle and a leaf spring that holds the needle, a magnetic head moving device is provided, which is provided with a locking portion that pushes the leaf spring and causes the leaf spring to come into contact with the lead screw at a constant pressure. apparatus.