JPS6020825B2 - Carriage drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a belt drive type carriage drive device used in a disk drive device or the like.

In particular, conventional belt-driven carriage drive devices used in disk drive devices, etc. use a closed-loop steel belt as shown in Figures 1 to 4, with the straight part of the belt 2 attached to the side of the carriage. The carriage 1 was coupled to drive the carriage 1 in the vertical direction in FIG.

However, according to this method, for example, when an attempt is made to move the carriage upward in FIG. 1, a rotational moment acts on the carriage in the direction of the rebound indicator as shown by arrow M in FIG. 1 (see Fig. 4).
When the carriage is driven downward in FIG. 4, a clockwise rotational moment acts on the carriage, causing the carriage to move to the right by an angle of 8 with respect to the shaft.

In other words, the angle differs by 20 when the carriage rises and stands still than when it descends and stands still. In Fig. 4, if the outer diameter of the shaft is ○2, the inner diameter of the shaft accommodation hole 14 provided in the carriage is ○, and the length of this 0 hole, that is, the length of the carriage, is L, then 8 is expressed by the following formula. be able to. 0, nine n-1 [(D2-D,)/L] Here, if L = 5 Cape, D2-D,: 0.05 skin, it will be 28, = 6 dollars.

By the way, for high-density magnetic recording, it is required that the overall inclination of the head 4 be less than 9 minutes, and the cause of head inclination is not only the inclination of the carriage with respect to the shaft but also the head itself with respect to the carriage. There is a feeling of attachment to the equipment, and a feeling of attachment to the equipment.

The large value of the carriage relative to the shaft as described above requires other factors to be extremely accurate, which increases cost and, in some cases, impedes high-density magnetic recording. An object of the present invention is to eliminate the above-mentioned drawbacks.According to the present invention, both ends of an open-loop drive belt are separately attached to both sides of the carriage, and the movement of the carriage in both directions of the carriage causes no trouble to the shaft. A carriage drive mechanism is provided that does not make any difference when moving.

Therefore, by using the agitation mechanism of the present invention, high-density magnetic recording can be easily carried out, or costs can be reduced by reducing the accuracy of other parts involved in head inclination. The present invention is characterized in that, in order to achieve the above object, a shaft receiving hole through which a rod-shaped shaft freely passes is provided on the carriage side, the linear reciprocating motion of the carriage is guided by the shaft, and a drum driven by an electric motor is provided. In a belt-driven carriage drive mechanism that uses the straight part of the belt stretched between the carriage and the bogie as the driving source for the carriage, the belt is made into an open loop, and one end of this loop is attached to one side of the carriage, and the other end is attached to one side of the carriage. are attached to the one side and the opposite side of the carriage IJ, and between the one end of the belt and the other side is a drum driven by an electric motor, which applies a constant tension to the belt, and The structure is designed to take into account the idler pulley that changes direction.

The details of the present invention will be explained with reference to an embodiment shown in FIG.

Components corresponding to those in FIGS. 1 to 4 are designated by the same reference numerals. Each end of the belt 2 is fixed to each side of the carriage 1 via a plate 13, 13.

The rotational movement of the stepper motor 10 (FIG. 2) is transmitted to the belt 2 by the drum 3. Suitable means are provided to prevent slippage of the belt 2 relative to the drum 3. 1st
, 2, a pin 8 is shown driven into the drum 3 through the belt 2 as this means. (Of course, in this case, pin 8 is
The contact angle between the drum 3 and the belt 2 is within the range. As a means for preventing slippage between the drum 3 and the rotating shaft of the step motor 10, a set screw 9 shown in FIGS. 1 and 2 is shown. 12, 12 is a shaft that guides the movement of the carriage, and holes 14, 12 provided in the carriage
14.

4 is a head fixed to the carriage.

5 is an idler pulley that applies a predetermined force to the belt 2 and changes the direction of the belt 2, and 5' is an idler pulley that changes the direction of the belt 2.

In order to apply tension to the belt 2, a leaf spring 6 is provided which is fixed to the base 11 via a presser plate 7, as shown in FIGS. 1 and 2, for example. When the carriage 1 is moved upward in the figure, the drum 3 rotates clockwise in FIG. The moment M is given.

Because of this rotational moment, the carriage 1 is mirrored relative to the shaft 12 by an angle 0 expressed by equation '1'. When moving the carriage downwards, the end of the belt 2 attached to the left side of the carriage applies a downward force and a counterclockwise rotational moment M to the carriage 1, causing the carriage 1 to tilt by 0 in the same direction. In other words, the carriage 1 is tilted in the same direction and at the same angle both when it moves upward and when it moves downward, so there is no difference depending on the direction of movement. As described above, in the present invention, the belt is not in a closed loop shape but in an open loop shape, and both ends of the belt are attached to both sides of the carriage. Therefore, accuracy of parts related to the neck tilt of the carriage and therefore the tilt of the head is required. Since it eases the stress and is easy to manufacture, it is possible to perform high-density magnetic recording and is inexpensive.

[Brief explanation of drawings]

1 is a plan view showing an example of a conventional carriage drive mechanism, FIG. 2 is a side view of the mechanism shown in FIG. 1, FIG. 3 is a partial end view as seen in the direction of arrow A in FIG. 1, and FIG. The figure is an explanatory view showing the operating state of the mechanism shown in FIG. 1, and FIG. 5 is a schematic side view showing an embodiment of the present invention. 1 is a carriage, 2 is a belt, 3 is a drum, 4 is a head, 5, 5' are idler pulleys, 6 is a plate spring, 7 is a holding plate, 8 is a pin, 9 is a set screw, 10 is a step motor, 1
1 is the base, 12 is the shaft, 13 is the plate, and 14 is the carriage hole. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A shaft receiving hole is provided on the carriage side through which a rod-shaped shaft freely passes through, and the linear reciprocating motion of this carriage is guided by the shaft, and a straight part of the belt stretched between the drum and the pulley driven by the electric motor is inserted into the carriage. In a belt-driven carriage drive mechanism used as a drive source, the belt is formed into an open loop, and one end of the open loop is attached to one side of the carriage, and the other end is attached to a side of the carriage opposite to the one side, A carriage drive mechanism characterized in that a drum driven by an electric motor and an idler pulley that applies a constant tension to the belt and changes the direction of the belt are arranged between the one end and the other end of the belt.