JPH0624049Y2 - Magnetic head moving mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a magnetic head moving mechanism of a recording / reproducing apparatus using a rotary recording medium such as a floppy disk.

(Prior Art) In a recording / reproducing apparatus using a rotary recording medium, a magnetic head is moved step by step in a radial direction of the rotary recording medium by a ratchet feed mechanism using an electromagnetic solenoid, a micromotor, or an input as a drive source. It has become.
In such a magnetic head moving mechanism, since the magnetic head is moved with reference to a predetermined start position, a mechanism for returning the magnetic head to the start position is required.

4 and 5 show an example of a conventional magnetic head moving mechanism. In FIGS. 4 and 5, the head carriage indicated by the reference numeral 4 integrally supports the magnetic head 3, and along the guide shaft 7, the magnetic head 3 is magnetized in the radial direction of the loaded rotary recording medium (not shown). The head 3 is moved. The head carriage 4 is biased in one direction by a spring 8, and a cam follower 5 provided on the head carriage 4 abuts on a cam surface of a cam 6, so that movement by the biasing force is restricted.

The cam 6 is formed in a gradually opening cam shape, and is supported rotatably around a shaft 38. A gear 9 and a ratchet wheel 10 are integrally provided on the cam 6 with the shaft 38 as a common shaft. Ratchet wheel 10 has feed claws 11
Is urged by a spring 13 to engage, and the check claw 12 is urged by a spring 14 to engage. The feed claw 11 is rotatably supported by the support shaft penetrating an elongated hole formed in the longitudinal direction and is movable within the range of the elongated hole, and is biased by the spring 13 as described above. . When the feed claw 11 is moved in the longitudinal direction by being driven by a solenoid, a micromotor, etc., it pushes and turns the ratchet wheel 10 and the check claw 12
Prevents the ratchet wheel 10 from reversing. One ends of the intermediary levers 24 and 25 are respectively located on the sides of the other ends of the feed claw 11 and the check claw 12, and on the sides of the other ends of the intermediary levers 24 and 25, respectively. The protruding portions 22 and 23 formed on the side edge portions of the eject interlocking lever 21 are respectively located. The eject interlocking lever 21 is normally located on the left side in FIG. 4 to engage the feed claw 11 and the check claw 12 with the ratchet wheel 10, but it is not possible to move the jacket holder to the eject position. In conjunction with this, they move to the right in FIG. 4, and their protrusions 22 and 23 move the intermediary levers 24 and 25 to the fourth position.
Rotate in the counterclockwise direction in the figure to set each intermediary lever 2
The feed claw 11 and the non-return claw 12 through the springs 4 and 25, respectively.
The feed pawl 11 and the non-return pawl 12 are separated from the ratchet wheel 10 by rotating clockwise against 4.

An interlocking gear 15 is engaged with the gear 9. Interlocking gear
The shaft 15 is rotatable about a shaft 39, and a disk 16 is integrally provided with the shaft 39 as a common shaft. A pin 17 is fixedly planted on the outer peripheral portion of the disc 16 and a return spring 18 is hung between the pin 17 and the immovable portion. The interlocking gear 15 is rotationally biased in the counterclockwise direction in FIG. 5 by the elastic force of the spring 18, so that the gear 9 and the ratchet wheel 10 and the cam 6 integral with the gear 9 are rotationally biased in the clockwise direction. A pin 19 is also fixedly planted on the disk 16, and when the pin 19 contacts the start positioning stopper 20, the rotation of the interlocking gear 15 and the rotation of the cam 6 due to the biasing force are restricted.
The starting position can be decided.

Although not shown in FIGS. 4 and 5, there is a jacket holder that holds a jacket containing a rotating recording medium and moves in a range from a recording / reproducing position to an eject position. The eject interlocking lever 21 moves to the right in FIG. 4 in conjunction with the movement to the position.

As shown in FIG. 4, the state where the pin 19 of the disc 16 is in contact with the start positioning stopper 20 is the start position, and the cam follower 5 of the head carriage 4 contacts the substantially maximum diameter portion of the cam 6. The head carriage 4 contacts the spring 8
The magnetic head 3 is in the most biased state against the magnetic field, and is in sliding contact with the reference track of the recording medium, for example, track 00. From this state, when the feed claw 11 is reciprocally driven in the longitudinal direction by a drive source such as an electromagnetic solenoid, a micromotor, or an input, the ratchet wheel 10 is fed one tooth at a time and the cam 6 is rotated counterclockwise in FIG. To move. During this time, the check claw 12 prevents the cam 6 from rotating in the reverse direction, and the interlocking gear 15 is connected to the spring 18 through the gear 9 integrated with the ratchet wheel 10.
It can be rotated clockwise while urging. By the above rotation of the cam 6, the head carriage 4 is moved downward along the guide shaft 7 in FIG. 4 by the urging force of the spring 8, and the magnetic head 3 is moved in the radial direction of the rotating recording medium. Switch the position of the slidable track.

When the jacket holder moves to the eject position, the eject interlocking lever 21 moves to the right in FIG. 4 in conjunction with this, and the protrusions 22 and 23 of the lever 21 move the intermediary lever 2
Feed claw 11 and check claw 12 via springs 4 and 25 respectively
It is rotated in the direction of separating from the ratchet wheel 10 against 3 and 14. As a result, the check force of the ratchet wheel 10 is released, and the ratchet wheel 10 and the cam 6 integrated with the ratchet wheel 10 are released.
The gear 9 and the gear 9 are returned by the elastic force of the spring 18 through the interlocking gear 16 in the clockwise direction in FIG. This rotation return is blocked by the pin 19 coming into contact with the start positioning stopper 20, whereby the magnetic head 3 is returned to the reference position.

(Problems to be Solved by the Invention) According to the above-described conventional magnetic head moving mechanism, the head carriage is returned to the start position while the cam follower of the head carriage is pressed against the cam surface. The return spring must be strong so as to overcome the frictional force between them and return the head carriage to the starting position, and as a result the drive energy required to feed the head must be large. In addition, since it is necessary to increase the elasticity of the return spring,
When returned to the starting position, the impact on the positioning stopper was large, which adversely affected the magnetic head and the like.

The present invention has been made in order to solve such a conventional problem, and eliminates the frictional force between the head carriage and the cam when returning to the start position, and thus the energy required to return to the start position. It is also an object of the present invention to provide a magnetic head moving mechanism that reduces the impact on the magnetic head and the like by reducing the impact when returning to the start position.

(Means for Solving the Problems) The present invention provides a jacket holder that holds a jacket accommodating a rotating recording medium and moves in a range from a recording / reproducing position to an eject position, and a magnetic holder in a radial direction of the rotating recording medium. A head carriage for moving the head, a cam for contacting the head carriage to move the head carriage, a cam driving means for driving the cam, and a cam for moving the jacket holder from the recording / reproducing position to the eject position. Recording having a mechanism for cutting off the drive of the drive means to the cam, and a biasing means for returning the cam displaced by the cam drive means to the start position when the drive of the cam drive means to the cam is cut off In the magnetic head moving mechanism of the reproducing device, eject from the recording / reproducing position of the jacket holder. It is characterized by having an interlocking mechanism for separating the head carriage from the cam by moving it to the position.

(Operation) When the jacket holder is moved to the eject position, the head carriage is separated from the cam in conjunction with this, and friction between the cam follower of the head carriage and the cam is eliminated.

(Embodiment) Hereinafter, the present invention will be described with reference to the embodiment shown in FIGS. 1 to 3, but the embodiment of FIGS.
The present invention has the same configuration as that of the conventional example except for a characteristic part, and therefore common components are denoted by common reference numerals and detailed description thereof will be omitted.

In FIG. 2, reference numeral 1 is a jacket accommodating a rotary recording medium such as a floppy disk, and 2 is a jacket holder. The jacket holder 2 is formed in a frame shape so that the jacket 1 can be held, and is rotated in a vertical direction about a shaft 40 so that the jacket 1 is held while holding the jacket 1 as shown by a solid line. It is possible to move within a range from such a recording / reproducing position to an eject position shown by a chain line. The jacket holder 2 has a pair of left and right bent portions 26, 27 formed downward in the base portion in a substantially right-angled direction. A bent portion 28 formed at one end of the eject interlocking lever 21 is located on one side of the bent portion 26, and when the jacket holder 2 is rotated to the eject position, the bent portion of the jacket holder 2 is rotated. 26 is the bent portion of the eject interlocking lever 21 28
By pressing, the eject interlocking lever 21 is moved to the right in the figure.

On the side of the other bent portion 27 of the jacket holder 2, the first
As shown in the figure, the bent portion 30 at one end of the interlocking lever 29 is located. The interlocking lever 29 is rotatable about a shaft 41 in a horizontal plane, and a bent portion 31 is formed at the other end of the lever 29. One end 33 of the bell crank 32 is located on the side of the bent portion 31. A protrusion 35 is formed on the head carriage 4, and the other end 34 of the bell crank 32 is provided near the lower portion of the protrusion 35 in FIG.
Is located.

In the above embodiment, when the feed claw 11 moves in the longitudinal direction, the ratchet wheel 10 is rotated counterclockwise by one step in FIG. 1 to move the magnetic head 3 in the radial direction of the rotating recording medium. What is performed is the same as that of the conventional example. Now, it is assumed that the jacket holder 2 is rotated to the eject position while the magnetic head 3 is in sliding contact with the track on which the rotating recording medium is present. By the rotation of the jacket holder 2, the bent portions 26, 27 also rotate integrally, and the bent portion 26 is the bent portion of the eject interlocking lever 21.
Press 28 to move the eject interlocking lever 21 to the right in FIG. 1, and the bent portion 27 is the bent portion 30 of the interlocking lever 29.
Is pressed to rotate the interlocking lever 29 clockwise in FIG. By the above rotation of the interlocking lever 29, the bent portion 31 pushes the one end portion 33 of the bell crank 32 to rotate the bell crank 32 counterclockwise. Due to the rotation of the bell crank 32, the other end 34 first moves the protrusion 35 of the head carriage 4 to the first position.
In the figure, the head carriage 4 is pushed upward to move it against the spring 8. As a result, the head carriage 4 moves upward in FIG. 1 from the start position, and the cam follower 5 thereof separates from the cam 6.

On the other hand, by the movement of the eject interlocking lever 21, the feed claw 11 and the check valve 12 are rotated against the springs 13 and 14 via the protrusions 22 and 23 and the intermediary levers 24 and 25, respectively, and the claws 1 and
1, 1 and 12 are separated from the ratchet wheel 10, and as described above, the cam 6 is rotated clockwise in FIG. 1 by the elastic force of the return spring 18 to return to the start position.

Thus, when the cam 6 is returned to the start position, the head carriage 2 is moved toward the start position by the interlocking mechanism including the bent portion 27 of the jacket holder 2, the interlocking lever 29 and the bell crank 32. Since the cam follower 5 is moved toward and displaced upward in FIG. 1 from the start position, the cam follower 5 is separated from the cam 6 and friction between the cam follower 5 and the cam follower 5 when the cam 6 returns to the start position is eliminated. Therefore, the return spring 18 may have a weak elasticity, it is possible to reduce the energy required to return the magnetic head to the start position, and the impact when each part returns to the start position is reduced.

Then, when the jacket 1 is inserted into the jacket holder 2 and moved from the eject position to the recording / reproducing position, the bent portion 27 moves in a direction away from the bent portion 30 and the interlocking lever 2
9. The bell crank 32 returns, and the head carriage 4 contacts the cam 6 at the start position.

In the above embodiment, if the head carriage 4 is brought into direct contact with the cam edge of the cam 6, the cam follower 5 need not be provided as a separate member.

The jacket holder 2 is not necessarily limited to the one that moves in the range from the recording / reproducing position to the eject position by the rotation, but may move in the range from the recording / reproducing position to the eject position by the parallel movement. FIG. 3 shows an example thereof. An inclined surface 43 is formed on the jacket holder 42 which moves in parallel in the vertical direction, and the bent portion 28 of the eject interlocking lever 21 is brought into sliding contact with the inclined surface 43. There is. Therefore, when the jacket holder 42 moves up and down in parallel, the eject interlocking lever 21 moves horizontally. The head carriage can be returned to the start position and the cam can be returned to the start position in synchronization with the movement of the eject interlocking lever 21. It should be noted that inclined surfaces may be formed on both sides of the jacket holder 42 so that one inclined surface returns the cam to the start position and another inclined surface returns the head carriage to the start position.

According to the present invention, since the interlocking mechanism that separates the cam follower of the head carriage from the cam by moving the jacket holder to the eject position is provided, the friction between the cam and the cam follower at the time of eject is eliminated, and the return The amount of force of the spring can be reduced, which can reduce the drive energy required to feed the magnetic head. Further, the impact when the cam returns to the start position is small, and the adverse effect on the magnetic head or the like can be prevented. Further, it is possible to reduce the wear of the cam and the cam follower.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a magnetic head moving mechanism according to the present invention, FIG. 2 is a perspective view of a portion of a jacket holder used in the above embodiment, and FIG. FIG. 4 is a side view showing another example of a portion to be operated, FIG. 4 is a plan view showing an example of a conventional magnetic head moving mechanism, and FIG. 5 is a side view of a cam mechanism portion of the same magnetic head moving mechanism. 1 ... Jacket, 2 ... Jacket holder, 3 ... Magnetic head, 4 ... Head carriage, 5 ... Cam follower, 6 ... Cam, 29 ... Interlocking lever that constitutes interlocking mechanism, 32 ... Bell crank that constitutes interlocking mechanism.

Claims (1)

[Scope of utility model registration request] 1. A jacket holder for holding a jacket containing a rotary recording medium and moving in a range from a recording / reproducing position to an eject position; a head carriage for moving a magnetic head in a radial direction of the rotary recording medium; A cam for contacting the head carriage to move the head carriage, a cam driving means for driving the cam, and a movement of the jacket holder from the recording / reproducing position to the eject position to interrupt the driving of the cam driving means for the cam. A magnetic head moving mechanism of a recording / reproducing apparatus having a mechanism and a biasing means for returning a cam displaced by the cam driving means to a start position when the cam driving means stops driving the cam. By moving the jacket holder from the recording / playback position to the eject position, Magnetic head moving mechanism to de carriage and having an interlocking mechanism for separating from the cam.