JPS63161570A - Carriage mechanism for floppy disk - Google Patents

Abstract

PURPOSE:To prevent the production of sound noise due to position deviation of a carriage caused by thermal expansion and an intermittent contact between a belt holder and the carriage by devising only one end of the belt holder to be fixed to the carriage in a carriage mechanism of the steel belt type. CONSTITUTION:A belt holder 17, while its one end is fixed to a carriage 10 by a screw 18 and its other end is not fixed, is brought into contact closely to the side end of the carriage 10. In this case, the belt holder 17 is formed to be bent by an angle THETA in advance and is brought into contact closely so as to be pressed in the direction of the side face of the carriage 10 in case of being mounted onto the carriage 10. Thus, the vibrating state that the belt holder is parted from or brought into contact with the side face of the carriage 10 intermittently while the carriage 10 is being moved, does not take place. Thus, the deficient state due to thermal expansion is prevented and the production of noise due to intermittent contact is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a carriage mechanism of a steel belt type floppy disk device.

(Prior Art) Conventionally, in a floppy disk NM, a steel belt type mechanism has been used as a carriage mechanism constituting a seek operation mechanism of a magnetic head. This mechanism consists of a steel belt wrapped around the stepping motor's boob.
The steel belt converts the rotational motion of the stepping motor into linear motion and transmits the linear motion to the carriage.

The carriage is equipped with a magnetic head at the tip, and
Guided by the rails of the book, it moves linearly in the radial direction of the disc. Here, the steel belt is fixed to a plate-shaped belt holder. By fixing this belt holder to the side surface of the carriage, linear motion is transmitted to the carriage.

By the way, when the belt holder is attached to the carriage, it is desirable that only one end of the belt holder is fixed to the carriage by screwing or the like in order to absorb displacement of the carriage due to 1 ml of heat expansion. This is because the material of the carriage (usually resin) and the material of the belt holder, which is steel, have different coefficients of linear thermal expansion.

However, the method of fixing the belt holder to the carriage at only one end has the disadvantage that noise is generated due to vibrations such as intermittent contact between the carriage and the belt holder while the carriage is being driven.

(Problem to be solved by the invention) 1llllll carriage using conventional steel belt system
In I, when a method of fixing only one end of the carriage and belt holder to prevent problems caused by thermal expansion is adopted, there is a problem in that noise is generated due to intermittent contact between the carriage and the belt holder.

SUMMARY OF THE INVENTION An object of the present invention is to provide a carriage mechanism for a floppy disk drive in a steel belt system that can prevent inconveniences caused by thermal expansion and reliably prevent the generation of noise due to intermittent contact between the carriage and the belt holder. It is in.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a steel belt type carriage mechanism, in which a member fixes both ends of the steel belt, and one end is directly connected to the side surface of the carriage. This mechanism includes a belt holder whose main body is closely attached to the side surface of the carriage while the other end is indirectly coupled or not coupled to the carriage.

With such a mechanism, problems caused by thermal expansion can be prevented by fixing the carriage and belt holder at one end, and noise generation due to intermittent contact can be prevented by bringing the belt holder into close contact with the side surface of the carriage. It can be prevented.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing the configuration of the carriage mechanism of the first embodiment. In FIG. 1, a carriage 10 has a magnetic head 11 mounted on its tip, and moves linearly in the radial direction (arrow 20) of a disk (not shown) using a main rail 12 and a subrail 13 as guides.

The drive mechanism of the carriage 10 includes a pulley 15 connected to a rotating shaft 14 of a stepping motor, a steel belt 16 wound around the pulley 15, and a belt holder 17. Both ends of the steel belt 16 are fixed to the belt holder 11 by spot welding or the like.

The belt holder 17 has one end fixed to the side surface of the carriage 10 by a screw 18, and its main body closely attached to the side surface of the carriage 10 with the other end left unfixed.

Next, the effects of this embodiment will be explained. First, when the rotating shaft 14 of the stepping motor rotates, the pulley 15 is rotationally driven. Rotary motion of the pulley 15 is converted into linear motion by a steel belt 16 wrapped around the pulley 15. The carriage 10 is guided by the main rail 12 and the sub-rail 13 and moves in the radial direction of the disk as linear motion is transmitted through the belt holder 17 . As a result, the magnetic head 11 mounted on the carriage 10 performs a seek operation on the disk.

Here, the belt holder 17 has one end fixed to the carriage 10 by a screw 18, and the other end, which is not fixed, is tightly attached to the side surface of the carriage 10. In this case, as shown in FIG. 2, the belt holder 17 is bent in advance by an angle e, and when attached to the carriage 10, it is pressed tightly against the side surface of the carriage 10. . Therefore, while the carriage 10 is moving, a vibration state in which the belt holder 17 intermittently separates from or comes into contact with the side surface of the carriage 10 does not occur. Therefore, during the movement period of the carriage 10, the belt holder 17 and the carriage 10
This means that no noise will be generated due to intermittent contact between the two.

Further, since only one end of the belt holder 17 is fixed to the side surface of the carriage 10 by a screw 18, there is a problem of thermal expansion due to the difference in coefficient of linear thermal expansion between the material of the carriage and the material of the belt holder, as described above. This makes it possible to prevent That is, compared to the case where both ends of the belt holder 17 are fixed to the carriage 10, it is easier to absorb the positional shift in the moving direction of the carriage 10 due to thermal expansion.

FIG. 3 is a plan view according to a second embodiment of the present invention,
Note: In contrast to the first embodiment, the other end of the belt holder 17 is connected to the overhanging portion 2 of the carriage 10 with a spring 22 interposed therebetween.
This is a mechanism connected to 1. Note that the other configurations are the same as those of the first embodiment shown in FIG. 1, so explanations will be omitted.

In the second embodiment, one end of the belt holder 17 is fixed to the carriage 10 by a screw 18 as in the first embodiment, but the other end is attached to the overhang 21 of the carriage 10 with a spring 22 interposed. It is connected. For this reason,
The belt holder 17 is firmly fixed to the carriage 10, and the main body is pressed toward the side surface of the carriage 10 by the suction force of the spring 22, and is brought into close contact with the carriage 10.

Therefore, as in the case of the first embodiment, while the carriage 10 is moving, the belt holder 17 and the carriage 1
There will be no intermittent contact with 0, and no noise will be generated due to this. In addition, the belt holder 17
Since only one end is fixed to the side surface of the carriage 10, the problem of thermal expansion can be prevented as in the first embodiment.

[Effects of the Invention] As detailed above, according to the present invention, in a steel belt type carriage mechanism in which only one end of the belt holder is fixed to the carriage, the belt holder and the carriage are It is possible to prevent situations such as intermittent contact between the two. Therefore, it is possible to alleviate the displacement of the carriage due to thermal expansion and to prevent the occurrence of noise due to intermittent contact between the belt holder and the carriage.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of a carriage mechanism according to a first embodiment of the present invention, FIG. 2 is a plan view showing the structure of a belt holder of the same embodiment, and FIG. It is a partial plan view concerning an example. 10... Carriage, 14... Rotating shaft, 15...
Pulley, 16... Steel belt, 17... Belt holder, 21... Overhang, 22... Spring. Applicant's agent Patent attorney Takehiko Suzue 1.1 Prisoner No. 2! g Figure 3

Claims (1)

[Claims] In the carriage mechanism of a floppy disk device that converts the rotational motion of a stepping motor to move a carriage equipped with a magnetic head linearly, the carriage mechanism includes a steel belt wound around a pulley connected to the rotor of the stepping motor, and a steel belt wound around a pulley connected to the rotor of the stepping motor. a belt holder, which is a member for fixing both ends, and one end is directly coupled to the side surface of the carriage, and the other end is indirectly coupled to the carriage, or the main body is closely attached to the side surface of the carriage in a state where the other end is not coupled to the carriage; A carriage mechanism for a floppy disk device.