JPH01143010A - Carriage mechanism for floppy disk device - Google Patents

Abstract

PURPOSE:To stably drive a carriage by providing a member for needle adjustment variable, which adjusts a load so that a needle guide member, a needle member and a needle screw can be contacted with a prescribed contacting pressure, on a needle supporting main body. CONSTITUTION:A needle 12, which contacts the channel of a lead screw 10 to be connected to the revolving shaft of a stepping motor, is supported by a needle supporting main body 20 and fit to the side surface part of a carriage 11. When the lead screw 10 is revolved, this revolution is converted to linear motion by the needle 12 and thus, the carriage 11 is guided by a main rail 14 and moved in the radius direction of a recording medium. Since the lead screw 10 contacts the needle 12 with the prescribed contacting pressure by adjusting the position of a screw piece member 24 for needle adjustment variable, the carriage 11 can be moved in a stable condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a carriage mechanism of a floppy disk device using a lead screw method.

(Prior Art) Conventionally, in a 3.5-inch floppy disk device, for example, a lead screw method has been used as a method for driving a carriage on which a magnetic head is mounted in the radial direction of a recording medium. In this lead screw method, as shown in Figure 4 (side view), a stepping motor (not shown)
A needle 12 attached to a carriage 11 comes into contact with the lead screw 10 which is rotationally driven by the needle 12, and the needle 12 converts the rotational motion of the lead screw 10 into a linear motion and transmits the linear motion to the carriage 11. The needle 12 sandwiches the lead screw 10 with a needle plate spring 13 attached to the carriage 11, and contacts the groove of the lead screw 10 with a predetermined load. The carriage 11 is guided by the main rail 14 and moves linearly in the radial direction of the recording medium.

By the way, in the lead screw method, the needle leaf spring 1
It is necessary to adjust the attachment of the needle leaf spring 13 so that the groove of the lead screw 10 and the needle 12 come into contact with each other with appropriate contact pressure under the load of 3.

However, in the manufacturing process of the carriage mechanism, it is difficult to accurately attach the needle leaf spring 13 so as to obtain an appropriate load. Further, while the lead screw 10 is being driven, the needle 12 may come off the groove of the lead screw 10, making it impossible to drive the carriage 11 (seek operation).

(Problems to be Solved by the Invention) In the conventional lead screw type carriage mechanism, it is difficult to accurately attach the needle leaf spring 13 in order to bring the lead screw 10 and needle 12 into contact with each other with an appropriate load. . Further, while the lead screw 10 is being driven, a situation may occur in which the needle 12 comes off from the groove of the lead screw 10. Therefore, the drive of the carriage 11 becomes unstable, which may cause problems in the seek operation of the magnetic head.

An object of the present invention is to stably drive a carriage in a lead screw method by easily adjusting the contact pressure between the lead screw and the needle and preventing the needle from coming off the groove of the lead screw. An object of the present invention is to provide a carriage mechanism for a floppy disk device that can perform the following functions.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a lead screw carriage mechanism that is connected to both ends of a needle member to maintain contact between the lead screw and the needle member. This is an Akebono bridge equipped with a needle guide member and a needle support body. The needle support body supports a needle guide member, a needle member, and a variable needle adjustment member for adjusting the load so that the needle member and the lead screw come into contact with a predetermined contact pressure, and is attached to the side surface of the carriage. It is being

With this configuration, it is possible to easily adjust the contact pressure between the lead screw and the needle, and it is possible to prevent the needle from coming off from the groove of the lead screw.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing the structure of the lead screw type carriage mechanism of the same embodiment. As shown in FIG. 1, in the carriage mechanism of the same embodiment, a needle support body 20 that supports the needle 12 that contacts the groove of the lead screw 10 is attached to the side surface of the carriage 11. The needle support body 20 is a frame body having a substantially U-shaped cross section, and is attached so as to sandwich the lead screw 10 therebetween.

As shown in FIG. 2 (plan view), the lead screw 10 is connected to the rotating shaft of a stepping motor 21.
A screw-shaped groove 22 is formed in the axial direction. The needle 12 supported by the needle support body 20 is shown in FIG.
As shown in the partially enlarged view of the figure, the lead screw 10
It is fixed so as to be in contact with the groove 22 of. Needle 1
Needle guide members 23 are provided at both ends of the lead screw 10 to prevent the needle 12 from coming off in contact with the groove 22 of the lead screw 10. This needle guide member 23 is formed to be larger than the diameter of the needle 12, and contacts the groove 22 of the lead screw 10 so that the lead screw 10 can be moved in the left-right direction when the axial direction is the front-back direction.
This prevents misalignment between the needle 12 and the needle 12.

Further, as shown in FIG. 3, the needle support body 20 includes a variable needle adjustment mechanism for contacting the lead screw 10 and applying a load so that the lead screw 10 and the needle 12 come into contact with each other with a predetermined contact pressure. A screw member 24 is attached. This needle adjustment variable screw member 24
When rotated, the distal end portion 24a comes into contact with the lead screw 10 and is configured to apply a load in the direction of the needle 12.

Next, the effects of this embodiment will be explained. First, so that the needle support body 20 holds the lead screw 10,
It is attached to the carriage 11. In this case, needle 1
The position of the needle support body 20 is set such that the needle support body 20 contacts the groove 22 of the lead screw 10. Next, by adjusting the position of the variable needle adjustment screw member 24 (tightening the screw member 24 is a work), the lead screw 10 is pressed in the direction of the needle 12, and the lead screw 10 and the needle 12 are set to a predetermined position. Apply a load so that they come into contact with a contact pressure of .

In this state, when the lead screw 10 is rotationally driven by the rotation of the stepping motor 21, the rotational motion of the lead screw 10 is converted into linear motion by the needle 12 and transmitted to the carriage 11.

As a result, the carriage 11 is guided by the main rail 14 and moves in the radial direction of the recording medium.

That is, the magnetic head mounted on the carriage 11 performs a seek operation on the recording medium in the radial direction.

Here, while the lead screw 10 is being driven to rotate, the needle 12 is applied to the lead screw 10 with a predetermined appropriate contact pressure.
Since the carriage 11 is in contact with the groove 22, it is possible to move the carriage 11 in a stable state. In the same embodiment, as in Moeki, the needle adjustment variable screw member 24 is
By adjusting this, the lead screw 10 and the needle 12 can be brought into contact with each other with an appropriate contact pressure. The needle 12 also has needle guide members 2 at both ends thereof.
3, it is possible to prevent the needle 12 from coming off the groove 22 of the lead screw 10 while the lead screw 10 is being rotated.

[Effects of the Invention] As detailed above, according to the present invention, when the lead screw and needle are attached in contact with each other in a lead screw type carriage mechanism, a predetermined load is applied to obtain a proper contact state. This can be easily adjusted during the manufacturing process. Therefore, the lead screw and needle can always be attached in a proper state, and the adjustment process can be simplified. Further, since it is possible to prevent the needle from coming off the groove of the lead screw while the lead screw is being rotated, the carriage can always be driven reliably. As a result, it is possible to always achieve a stable seek operation.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of a carriage mechanism according to an embodiment of the present invention, FIG. 2 is a plan view showing the structure of a glue screw of the same embodiment, and FIG. 3 is a partially enlarged view of FIG. Fourth
The figure is a side view showing the configuration of a conventional carriage mechanism. 10... Lead screw, 11... Carriage, 1
2... Needle, 20... Needle support body, 22
...Groove, 23...Needle guide member, 24...
Screw member for variable needle adjustment. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] In a lead screw type carriage mechanism that converts rotational motion of a lead screw into linear motion and transmits the same to the carriage, there is provided a needle that contacts a groove of the lead screw to convert rotational motion into linear motion. a needle guide member connected to both ends of the needle member to maintain contact between the lead screw and the needle member;
The needle guide member, the needle member, and a variable needle adjustment member for adjusting the load so that the needle member and the lead screw are in contact with each other with a predetermined contact pressure are supported, respectively, and are attached to the side surface of the carriage. 1. A carriage mechanism for a floppy disk device, comprising: a needle support body;