JPH021754Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head carriage, and more particularly to a magnetic head carriage that can be applied to an information recording/reproducing apparatus using a floppy disk.

When exchanging information using a floppy disk, a magnetic head is brought into contact with the medium surface of the floppy disk mounted in a drive device to execute the required recording and writing processes.

Therefore, when replacing a floppy disk, the magnetic head naturally comes into contact with and separates from the surface of the medium, but the impact caused during contact becomes a particular problem.

This is because large shocks can damage floppy disks and magnetic heads.

Conventionally, various measures have been attempted as means for alleviating the impact.

For example, in the case of a drive device that uses an 8-inch or 5-inch floppy disk, the magnetic head is brought close to the medium to a certain extent as soon as the floppy disk is inserted, and further movement is restricted by a regulating member, and the information is read. During writing, the regulating member is retracted by the action of a plunger, and the moving distance of the magnetic head is set small, thereby reducing the impact. However, in this case, extra space is required to set up the plunger, which goes against the desire to miniaturize the device, and also causes problems in terms of cost and functionality, such as consumption of drive power and rise in temperature. There is a problem with this.

As another example, in the case of a drive device using a 3-inch floppy disk, a technique is known in which a cylinder type damper is used as a shock mitigation means, but this damper is attached directly to the arm of the magnetic head. Because the damper function is performed from the magnetic head through many parts rather than through the magnetic head, due to the accumulation of errors in each part,
There is a disadvantage that the timing at which the damper functions and the timing at which the magnetic head comes into contact with the medium may deviate, resulting in a lack of reliability.

Especially like a 3 inch floppy disk,
In a case where the medium is covered with a hard case, the distance the magnetic head must move when the floppy disk is installed in the drive device is long, so it is desired to provide an effective means for mitigating the impact.

The present invention was developed in view of this situation, and aims to provide a magnetic head carriage equipped with a simple shock mitigation means that effectively utilizes the dead space of the device and does not require special energy such as electric power to operate. purpose.

The configuration of the present invention will be described below based on one embodiment.

FIG. 1 shows a magnetic head carriage to which the present invention is applied. In the figure, code 1 is the upper holder;
Reference numeral 2 indicates a lower holder, and these are collectively referred to as an upper and lower holder 3. The upper holder 1 and the lower holder 2 are connected at one end to each other through a block 4 by tightening a screw 5. Further, the middle portion of the upper holder 1 is connected via a leaf spring 6, and the upper holder 1 is biased with respect to the lower holder by the leaf spring 6. Magnetic heads 7 and 8 are attached to opposing surfaces at each free end of the upper and lower holders 3, and the magnetic heads 7 and 8 are held in contact with the medium during information writing and reading.

Incidentally, one of the magnetic heads 7 and 8 may be replaced with a pad.

A damper according to the present invention is attached to the upper and lower holders 1 in the vicinity of the joints formed by the screws 5.

This damper 9 includes a rotation conversion mechanism that converts the opening/closing motion of the upper and lower holders 1 into rotational motion, a speed-up gear train that speeds up the rotational motion, and a speed-up gear train that is provided in the speed-up gear train so that the top and bottom holders 1 It consists of a one-way rotating clutch that transmits the movement to the driven part only during the closing movement, and a braking means mounted on the final transmission shaft of the speed increasing gear train.

The rotation conversion mechanism includes a substantially L-shaped engagement piece 10a fixed to the upper holder 1, a swinging piece 10b engaged with the tip of the engagement piece 10a, and a swinging piece 10b. A small gear 10c (see FIG. 2) that meshes with the formed segment gear 10 _b1 and a rocking piece 1
0b and a substrate 17d that pivotally supports the small gear 10c.

The base plate 10d is integrally constructed with the block 4, supports the swinging piece 10b at the center of the segment gear _10b1 on the axis _O1 , and supports the small gear 10c on the axis O1 as shown in FIG. It is pivoted at ₂ .

That is, the engaging element _10b2 formed at the tip of the swinging piece 10b is located in a space surrounded by the engaging piece 10a and the upper holder 1, and therefore, as the upper holder 1 moves up and down, The swinging piece 10b swings around the axis _O1 . This oscillating motion is then converted into a rotational motion of the small gear 10c as shown in FIG.

Next, the speed increasing gear train will be explained with reference to FIGS. 2 and 3.

The speed-increasing gear train consists of a large gear 11 loosely fitted on the shaft _O2 .
a, and a small gear 11b that meshes with this large gear 11a.
and a large gear 11c integrated with this small gear 11b,
It is composed of a worm gear 11d that meshes with this large gear 11c.

In this speed-increasing gear train, the rotation of the small gear 10c is increased in speed and transmitted to the shaft 11e of the worm gear 11d, which is the final transmission shaft. Therefore, a slight rocking motion of the rocking piece 10b is converted into high-speed rotation of the shaft 11e.

Next, the braking means will be explained.

The braking means is composed of a circular expansion plate 12a that is integrally attached to the shaft 11e, and a cylindrical cup 12b that is set at a predetermined interval around the expansion plate 12a.

The expansion plate 12a is made of an elastic material such as rubber, and its details are shown in FIG.

As shown in the figure, the expansion plate 12a has a weight portion _12a2 as a free end formed by a slit _12a1 cut in the circumferential direction after facing approximately radially from the outer periphery. There is. Also, this weight part 12
A weight part 12 _a3 having the same configuration as the weight part 12 _a2 is provided at a position axially symmetrical to _a2 .

Both of these weight parts 12 _a2 and 12 _a3 are made with a narrow diameter at their proximal ends, so that the shaft 11
When e is rotated at high speed, the narrow portions 12 _a4 , 12
It is expanded in the outer radial direction indicated by the arrow with _a5 as the fulcrum.

On the other hand, the expansion plate 12a is fitted and supported in a cup 12b which is an immovable member that is integrally fixed to the lower holder 2. Therefore, when the expansion plate 12a opens with the above-mentioned high-speed rotation, Weight part 12 _a2 ,1
2 _a3 comes into sliding contact with the inner wall of cup 12b,
The braking force acts to reduce the movement speed of the swinging piece 10b, and the movement of the upper holder 1 is eventually slowed down.

Here, for the purpose of buffering the impact of the magnetic head on the medium, it is necessary to rotate the expansion plate 12a at high speed to exert the braking function only when the upper and lower holders 3 are moved to close. .

In view of the above, in the present invention, a one-way rotating clutch is interposed between the shaft _O2 and the large gear 11a.

This one-way rotating clutch is constructed with a coil spring 13. That is, one end of the coil spring 13 is inserted into and secured to the boss portion of the large gear 11a, and the free end of the spring is loosely wound around the shaft _O2 . The winding direction is the same as the direction in which the shaft _O2 rotates when the upper and lower holders 3 are moved in the closing direction.

Therefore, the large gear 11a and the shaft _O2 are connected only when the upper and lower holders 1 are closed, and unnecessary wear and tear on the expansion plate is avoided.

Moreover, when the upper and lower holders 1 are opened, it does not act as resistance.

The present invention is applicable not only to a magnetic head carriage for double-sided floppy disks in which a magnetic head is attached to each of the upper and lower holders 3, but also to a magnetic head carriage for single-sided floppy disks in which a magnetic head is attached to one side and a pad is attached to the other. may also be applied. In this case, the pad may be made of a hard material such as ceramic, or may be made of a soft material such as felt.

The speed-increasing gear train is not limited to the above embodiment, and the speed-increasing rate may be adjusted by appropriately increasing or decreasing the number of gears depending on the actual situation.

As explained above, the damper according to the present invention is
Since it has a configuration that can be set in the opposing space between the upper holder 1 and lower holder 2, which is considered a dead space, by adding a damper function,
There is no particular need for the equipment to become larger. or,
Since it functions in conjunction with the movement of the upper and lower holders, it does not consume electricity for driving, and has superior temperature characteristics compared to oil-type and air-type dampers.
It can be said that the operation is stable.

Furthermore, since the damper is installed in the unit that moves while tracking, the damper function can be obtained without using an external damper drive means that follows the position that changes during tracking.

By installing such a simple damper, the floppy disk or magnetic head can be used for a long period of time, which is convenient.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of the magnetic head carriage according to the present invention, Figure 2 is a partial cross-sectional view of the same figure explaining the main parts of the present invention, and Figure 3 is a view of the same figure from above in the axial direction of the worm gear. FIG. 4, a partial cross-sectional view, is a plan view of the expansion plate. 3... Upper and lower holder, 9... Damper, 10a
...Engagement piece, 10b...Rocking piece, 10 _b1 ...Segment gear, 10e...Small gear, 10d...Substrate, 11a...Large gear, 11b...Small gear, 11
c...Large gear, 11d...Worm gear, 11e
...Shaft, 12a... Expansion plate, 12b... Cup,
13...Coil spring.

Claims (1)

[Claims for Utility Model Registration] In a magnetic head carriage in which a magnetic head is attached to one end of upper and lower holders which are connected at one end and are movable to open and close, and a magnetic head or pad is attached to the other side facing each other, near the joining part of the upper and lower holders. The damper is equipped with a rotation conversion mechanism that converts the opening/closing motion of the upper and lower holders into rotational motion, a speed-up gear train that speeds up the rotational motion, and a speed-up gear train that is provided in the speed-up gear train to rotate the upper and lower holders. a one-way rotating clutch that transmits motion only when the holder makes an opening motion; and an expansion plate that is attached to the final transmission shaft of the speed increasing gear train and whose outer diameter changes according to the rotational speed of the shaft. A magnetic head carriage characterized by having a cup as a stationary member set at a predetermined distance from the outer periphery of the expansion plate.