JPH0283869A - Head movable mechanism - Google Patents

Abstract

PURPOSE:To realize the fine adjustment of a head position with high accuracy, to increase a track density and to correspond to the large capacity of a memory capacity by constituting the head movable mechanism of a floppy disk device of motors for moving and for micro motion provided separately. CONSTITUTION:A groove 3c is provided on a part of a whirl-stop 3b formed at one edge of a first mobile body 3, this is engaged to a guiding part 10a formed on a third mobile body 10 and the mobile body 3 is fixed so that it cannot rotate. When the constitution is executed like this and a screw shaft 1a is rotated, the relative position of a groove 1b and a pin 15 is moved, the mobile body 3 is moved on the shaft 1a and a second mobile body 4 and a third mobile body 10 are moved. Namely, by a stepping motor 1 for rough motion and the groove 1b provided on the shaft 1a, a head 9 fitted at the mobile body 10 is roughly sent to the vicinity of the aimed position, thereafter, when a signal is inputted to a motor 2 for micromotion, a gear 7 attached to the shaft of the motor 2 is driven, the mobile body 4 is rotated through a gear 6 and the micromovement is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head moving mechanism in a floppy disk device or the like.

[Prior Art] Conventionally, the head moving mechanism of a floppy disk device has a
(1) Lead screw type, (2) Spiral cam type, (3) Steel belt type, etc.

All of these use stepping motors as their driving sources. The head is moved by a lead screw, spiral cam, and steel belt that are directly connected to a stepping motor.

In these mechanisms, the moving pitch of the head depends on the angle of one step of the stepping motor, and the positioning accuracy of the head depends on the angular accuracy of the stepping motor.

[Problems to be Solved by the Invention] With the conventional mechanism described above, as the recording capacity of recent floppy disk devices has increased, it is essential to increase the track density, but there are difficult problems in doing so. There is.

nU, when increasing the track density, in order to maintain compatibility of the recording medium and crosstalk with adjacent tracks,
In order to prevent track misalignment, it is necessary to further improve the head positioning accuracy than in the past.

However, with conventional mechanisms, there are limits to the angle and angular accuracy of one step of the steering motor.
At present, it is extremely difficult to achieve high track density and high precision.

The present invention has been made in order to solve this problem, and it is an object of the present invention to provide a head movement mechanism that can position the head with high precision so as to correspond to high-density recording and reproduction.

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, in a mechanism for moving a bed carriage to which a head is attached, a coarse movement motor for coarsely adjusting the position and a fine movement motor for finely adjusting the position of the bed carriage are provided. A separate motor is provided.

[Function] By configuring as described above, fine adjustment of the head position can be performed with extremely high precision, making it possible to increase the trough density and making it possible to cope with an increase in the recording capacity of the device. .

[Example] FIG. 1, FIG. 2, and FIG. 3 are diagrams showing an example of the present invention. FIG. 1 is a drawing that best represents the features of this invention. In the figure, l is a coarse stepping motor for coarsely feeding the head, la is a screw shaft directly connected to the rotating shaft of the coarse stepping motor l, lb is a helical groove formed on the outer peripheral surface of the screw shaft 1a, 2 is a fine movement motor for finely adjusting the screw shaft position, 3 is a first moving body movably engaged with the screw shaft 1a, 4 is a second moving body that is screw-fitted to the first moving body 3 and is movable on the first moving body 3; 4a is a groove formed on the outer peripheral surface of the second moving body 4; 4b is a groove formed on the outer peripheral surface of the second moving body 4; A gear part formed at one end of the second moving body 4, 5 is a gear that meshes with the gear part 4b, 6 is a gear formed coaxially with the gear 5, 7 is a rotating shaft of the fine movement motor 2 that meshes with the gear 6 4-1 is a gear, 8 is a holder for holding the coarse movement stepping motor l and the fine movement motor 2, and also for pivotally supporting the screw shaft 1a, gears 5 and 6, 9 is a head, lO 11 is a guide bar that guides the third moving body 10; 12 is a guide bar that is attached to the third moving body 10 and is engaged with the groove 4a on the second moving body 4; The matching needle pin 113 is a leaf spring for pressing the needle bottle 12 into the groove 4a without play, and 14 is a screw for attaching the leaf spring 13 to the third moving body 10.

Further, FIG. 2 is an explanatory diagram of a partial cross section seen from the direction of arrow A in FIG. 1. The same members as in FIG. 1 are given the same reference numerals, so their explanation will be omitted.

In FIG. 2, 3a is a threaded portion formed on the outer circumferential surface of the first moving body 3, and 15 is a groove 1 incorporated into the first moving body 3.
4C is a threaded portion formed on the inner peripheral surface of the second movable body 4 and engages with the threaded portion 3a of the first movable body 3; 3, which is a striker attached to a moving weight of 0.

Moreover, FIG. 3 is an explanatory view seen from the direction of arrow B in FIG. 1.

In FIG. 3, 3b is a rotation stopper formed at the - end of the first moving body 3, and a groove 30 is formed in a part of the stopper.

10a is a guide portion formed on the third moving body 10 and engaged with the groove 3c.

In the above configuration, the guide bar 11 and the holder 8 are attached to a fixed chassis of an apparatus (not shown). Here, when a signal is input to the coarse movement stepping motor l by a drive circuit (not shown), the screw shaft 1a
rotates in predetermined steps clockwise or counterclockwise.

As shown in FIG. 2, a bottle 15 is incorporated into the first movable body 3, and is inserted into the groove 1b on the screw shaft la in an engaged state. A second movable body 4 is fitted onto the outer periphery of the first movable body 3 with a screw. A needle pin 12 is engaged with the groove 4a on the second movable body 4, and is biased by a leaf spring 13 in the downward direction in the figure, that is, so that the needle pin 12 comes into close contact with the groove 4a. As a result, the bottle 15 is similarly urged to come into close contact with the groove 1b.

As shown in FIG. 3, a groove 3c formed in a part of a detent 3b formed at one end of the first moving body 3 and a guide portion 10a formed on the third moving body 10 engage with each other. and
The first moving body 3 is configured not to rotate.

In this state, when the screw shaft 1a rotates, the groove 1
Since the relative position of b and the bottle 15 moves, the first moving body 3
can move on the screw axis la. As a result, the second mobile body 4 and the third mobile body IO also move.

In this way, the third moving body IO is moved by the coarse movement stepping motor l and the groove 1b formed on the screw shaft la.
The bed 9 attached to the bed 9 is roughly fed to the vicinity of the target position.

Next, after coarse feeding, when a signal is input to the fine movement motor 2, the motor 2 rotates clockwise or counterclockwise to drive the gear 7 attached to the motor shaft. Gear 7 meshes with gear 6 to rotate gear 6. Similarly, the gear 5 rotates together with the gear 6 to rotate the gear portion 4b on the second moving body 4 that is meshed with the gear 5. That is, the second moving body 4
rotates on the first moving body 3. Ii and second moving body 3
．． 4 are fitted with screws, so the second moving body 4 is connected to the first moving body 4.
While rotating on the moving body 3, it moves in the left and right direction shown in the second figure.

Further, a third moving body 10 is placed in the groove 4a on the second moving body 4.
Since the needle bin 12 attached to the third movable body 10 is engaged with the second movable body 4, the third movable body 10 also moves together with the second movable body 4.

Therefore, the head 9 mounted on the third moving body 10 moves. If the pitch of the threaded portions 3a and 4C is formed finely, fine movement of the second movable body 4, that is, the head 9 can be prevented.
fine movements can be achieved.

Further, the stopper 16 shown in FIG.
2 from the groove 4a, and is installed with a slight gap from the plate spring 13.

It should be noted that the present invention is not limited to the .\rad movement mechanism of the floppy disk device shown in the embodiment, but can also be used in other recording/reproducing devices.

[Effects of the Invention] As explained above, the head moving mechanism of the present invention is capable of finely adjusting the head position with extremely high accuracy by providing separate motors for coarse movement and fine movement, and the head movement mechanism of the present invention is capable of finely adjusting the head position with extremely high accuracy. This makes it possible to increase the density of the ink, making it possible to cope with an increase in the recording capacity of the device.

In addition, after positioning the head, the head position will not shift even if the power to both motors is turned off.The structure has excellent vibration and shock resistance, and the power consumption of the motors can be reduced to suppress heat generation. becomes.

[Brief explanation of the drawing]

FIG. 1 is an overall view of an embodiment of the invention, FIG. 2 is a partial sectional view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a view taken in the direction of arrow B in FIG. In the figure. 1: Coarse movement stepping motor 2: Fine movement motor 3: First moving body 4: Second moving body 8: Holder 9: Head 10: Third moving body 12: Needle bin 13: Leaf spring 15: Bin 16: Stopper agent patent attorney 1) Haru Kitatake

Claims (1)

[Claims] a first movable body configured to be movable; a first driving means for moving the first movable body by a predetermined feed amount; and a first movable body movably arranged with respect to the first movable body. a second moving body, and a second driving means capable of moving the second moving body relative to the first moving body in a range smaller than the feed amount;
a head support body to which a head is attached and which is engaged with the second moving body and is movable together with the second moving body, the first moving body being moved by the first driving means; The head support body is coarsely moved, and the second moving body is moved by the second driving means to the first moving body.
A head moving mechanism, characterized in that the head support is configured to be able to move slightly by moving it relative to a moving body.