JPS62241180A - Flexible disk device - Google Patents

Abstract

PURPOSE:To always obtain the stable running of a carriage by increasing a value divided with the interval of the contact part between a rod and the carriage by the interval between the rod and the torque delivery part of the carriage more than the sum of the friction coefficient of the contact parts between the rod and the carriage. CONSTITUTION:A size (l) of the carriage 4a is selected similarly as 30mm to that of a conventional device, while a size L is selected as 25mm, then the ratio of l/L=1.2. Further, the friction coefficients muA, muB of the contact parts between the rod 7 and the carriage 4a are equal to each other and the value is 0.2-0.35, then the relation of muA+muB<l/L exists, then the condition causing the automatic stop is not given to the carriage 4a, which is run always stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carriage positioning mechanism in a flexible disk device.

[Conventional technology]

The second factor and FIG. 3 are a front view and a side view, respectively, showing a carriage portion in a conventional flexible disk device. In each figure, 1 is a recording medium, 2 is a recording/playback head on the lower side of the recording medium 1, 3 is a recording/playback head on the upper side of the recording medium 1, 4 is a carriage that supports the recording/playback head 2, and 5 is a carriage that supports the recording/playback head 2. An arm that supports the recording/reproducing head 3, 6 a bush attached to the carriage 4, 7 a rod that is a guide component that guides the carriage 4 when it travels, 8 a leaf spring built into the arm 5, 9 10 is a screw that fixes the leaf spring 8 to the carriage 4, and 10 is the arm 5.
11 is a carriage drive motor; 11 is a carriage drive motor;
a is a screw cut into the rotating shaft of the carriage drive motor 11; 12 is a screw 1 cut into the rotation shaft of the carriage drive motor 11;
This is a pin that transmits information to the carriage 4 via 1a.

4 and 5 respectively show the carriage of FIG. 2,
It is a diagram showing a model of the force relationship acting thereon. FIG. 4 shows the case where the carriage 4 is moved inward, and FIG. 5 shows the case where the carriage 48 is moved outward. In each figure, F is the carriage driving force, P
is the force exerted by the rotating recording medium 1 on the carriage 4I via the recording/reproducing head 2, and Q is the force exerted by the carriage 4 during movement.

The force acting between the recording medium 1 and the recording/reproducing head 2, R,
, RB is the reaction force exerted by the rod 7 on the carriage 4 at each point, μ, μ8 is the friction coefficient at the contact portion between the rod 7, which serves as a guide when the carriage 4 travels, and the carriage 4, and each sign is The subscripts f and r attached to
Each indicates that the carriage 4 is moved inward or outward.

Next, with respect to FIGS. 4 and 5, Ff and Fr are calculated as follows. So, L, LH.

1 and lH represent the length of each portion shown in FIGS. 4 and 5.

(When moving the carriage 4 inward as shown in Fig. 4 1) From the balance of forces, Ff ” Qf 10μ・RAf+μ8・RBf
・・・・・・・・・・・・・・・(F-1) From the balance of moments around point A, P・CIH-1)+Ff
-L=Qf-LH+RBf-1...(F-2)
From the balance of moments around point B, P−lH+Ff
-L=Qf-LH+RAf-4・・・・・・・・・・・・
- (F-3) Substituting the above equations (F-4) and (F-5) into equation (F-1) from the above equations (F-2) and (F-3).

Therefore, 1-Cμ+μB)·L≦0 In the above case, the carriage 41 is automatically stopped, and the carriage 4 will not move no matter what Ff87+0 is applied.

(When moving the carriage 4 outward as shown in Figure 5g5) From the balance of forces, Fr=Qr+μe・RAr+μ8・RBr...
・・・・・・・・・・・・・・・(R-1) Moment balance around point A P・CIH-l) +Qr
-LH+ RBr-l = Fr-L ・-・-・(R
-2) P-IH from moment balance around point B
+Qr-LH=Fr-L +RAr-1-...---
--・-(R-3) From the above equations (R-2) and (R-3), substituting each of the above equations (R-4) and (R-5) into equation (R-1) and rearranging it: .

Therefore, 1+cμE1μB)・L≦0 In the above case, automatic stopping occurs in the carriage 4,
No matter how much Fr is added, the carriage 4 will not move.

Next, the operation of the carriage 4 in the above conventional flexible disk device will be explained. Each of the recording/reproducing heads 2 and 3 is supported by a carriage 4 and an arm 5, and presses and contacts the recording medium 1 by a spring 10 to write or read information. The rotational movement of the carriage drive motor 11 is controlled by a screw lla cut into the rotation shaft of the carriage drive motor 11 and a pin 12 connected thereto.
By converting the linear motion from one to one, the carriage 4 is driven and positioned at a predetermined position.

[The problem that the invention attempts to solve]

The carriage 4 in the conventional flexible disk device is constructed as described above, and as shown in FIGS. 2 and 3, for example, the carriage 41 Automatic stopping may occur, and as a result, there is a problem in that it is difficult to consistently run the carriage 4 stably.

The present invention has been made to solve these problems, and its object is to provide a flexible disk device that allows the carriage to run stably without automatically stopping the gear ridge.

[Means for solving gaps]

In the flexible disk device according to the present invention, when the carriage travels, the distance between the contact portion between the rod and the carriage is determined by the distance between the rod and the carriage. of,
The structure is such that the value divided by the distance between the rod and the driving force transmission section of the carriage is large.

[Effect]

In the flexible disk device t of the present invention, the distance between the contact portion between the rod and the carriage and the driving force transmission portion between the rod and the carriage is determined by the value of the phase of the friction coefficient at the contact portion between the rod and the carriage. By configuring so that the value divided by the interval is large, stable running of the carriage can always be obtained without automatic stopping of the carriage.

〔Example〕

FIG. 1 is a front view showing a carriage portion of a flexible disk device according to an embodiment of the present invention, and the same or equivalent parts as in FIG. 2 are indicated using the same reference numerals.
A detailed explanation thereof will be omitted.

In the figure, 4a is a carriage improved according to the present invention. In the carriage 4a improved by this invention, J=30iI! l is the same as in the conventional example shown in FIG. 2 above, but L=251III. Therefore, -=1.2, and since μ=μ8, if μ=μ, (0, 6), automatic stopping will not occur in the carriage 4a.However, as mentioned above, μ=μ8. =
Since μ, = 0.2 to 0.35, then as shown in equation (F-7) above, the carriage 4
No conditions occur that would cause automatic locking.

Therefore, the carriage 4a can always travel stably.

In the above embodiment, the case where L was changed was explained, but l may be changed by a large value f, or,
μ may be changed to a smaller value.

Further, in the above embodiment, the drive source of the carriage 4a and its driving force transmission fi4 are connected to the threaded rotating shaft of the carriage sounding motor 11, and the rotational force is transmitted to the threaded shaft of the carriage sounding motor 11.
Although the explanation has been given on a four-way motor using a pin 12 that transmits the signal to the carriage 4a via a belt tracker, it is also possible to convert the rotational motion of the carriage drive motor 11 into a linear motion using a belt tracker.

〔Effect of the invention〕

As explained above, in a flexible disk device, the distance afLyjLg between the rod and the carriage is determined by the distance between the rod and the carriage at the driving force transmission portion, rather than the sum of the coefficients of friction at the contact portion between the rod and the carriage. Since the structure is configured so that the value divided by the distance between the It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a front view showing the carriage portion of a flexible disk device according to an embodiment of the present invention, and FIGS. 2 and 3 are front and side views showing the carriage portion of a conventional flexible disk device, respectively. 4
5 and 5 are diagrams each showing a model of the carriage shown in FIG. 2 and the force relationship acting thereon. In the figure, 1... Recording medium, 2, 3... Recording/reproducing head, 4t4a... Carriage, 5... Arm, 6... Bush, 7... Rod, 8... Plate Spring, 9, 11a...Screw, 10...Spring, 11...
Carriage drive motor, 12...bin. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] Supports a recording/playback head that has the function of writing information to a recording medium or reading information recorded on a recording medium, or both, and the recording/playback head is connected to the recording medium. In a flexible disk device equipped with a carriage that moves to a predetermined track of A flexible disk device characterized in that the value obtained by dividing the distance by the distance between the guide component and the portion that transmits the force for driving the carriage is increased.