JPH0561861U - Carriage feed mechanism - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a carriage feed mechanism that drives a carriage by meshing a screw shaft and a rack, and provides a carriage feed mechanism in which the pressing force of the rack is easily adjusted and which is inexpensive. The purpose is to [Structure] A support arm 9a and a rack 9 are mounted on a carriage 3 on which an optical head 4 having an optical pickup 5 is mounted.
And the elastic arm 8 are attached. The rack 9 is meshed with the screw shaft 1 so that the carriage 3 moves along the guide shaft as the screw shaft 1 rotates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carriage feed mechanism, and more particularly, to a carriage feed mechanism that drives a carriage by meshing a screw shaft and a rack.

[0002]

[Prior Art]

 FIG. 4 shows a carriage feeding mechanism used in a conventional optical disk device.

An optical head 4 having an optical pickup 5 for reading a signal of an optical disk is mounted on a carriage 3 which is slidably supported along a guide shaft. An arm 6 made of a metal plate extends from the bottom of the carriage 3, and a resin-made (polyacetal) rack 7 is fixed to the tip of the arm 6. The rack 7 meshes with the screw shaft 1 positioned in parallel with the guide shaft 2 and is pressed against the screw shaft 1 with an appropriate pressing force by the elasticity of the arm 6 so that the rack 7 cannot be disengaged.

In the configuration as described above, when the screw shaft 1 rotates, the rack 7 moves along the screw shaft 1 due to the action of the screw of the screw shaft 1, and the carriage 3 connected by the arm 6 becomes It moves between predetermined positions along the guide shaft 2.

[0005]

[Problems to be solved by the device]

 The maximum movement range of the carriage 3 is regulated by a stopper (not shown), and when the carriage 3 comes into contact with the stopper and stops, and the screw shaft 1 rotates by dragging due to inertia, the rack. An excessive force may act on the arm 6 when the 7 tries to move further. Therefore, the pressing force of the rack 7 due to the elasticity of the arm 6 is appropriately adjusted, and in the above case, the arm 6 is slightly bent to disengage the rack 7. Therefore, the screw shaft 1 idles on the rack 7, and an excessive lateral force does not act on the arm 6.

However, if the pressing force of the rack 7 is too weak, the sliding resistance between the carriage 3 and the guide shaft 2 will easily cause the rack 7 to idle.

Therefore, the upper limit and the lower limit of the strength of the pressing force of the rack 7 on the screw shaft 1 are determined, and the elastic force of the arm 6 that generates the pressing force needs to be finely adjusted.

However, the conventional arm 6 is insert-molded on the resin rack 7, and when the pressing force of the rack 7 is not appropriate at the time of assembly, it is not possible to replace only the arm 6. Instead, the rack 7 had to be replaced.

In addition, since the arm 6 is insert-molded on the rack 7, there is a problem that its manufacturing cost is high.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive carriage feeding mechanism in which the pressing force of the rack is easily adjusted.

[0011]

[Means for Solving the Problems]

 According to the present invention, a rack fixed to the tip of an arm of a carriage having an arm made of an elastic member, on which a recording and / or reproducing head is mounted, is engaged with a screw shaft, and the carriage is used as a guide shaft by rotation of the screw shaft. A carriage feed mechanism for moving along the carriage is provided with a first arm connecting the rack and the carriage and a second arm made of an elastic member for pressing the rack against the screw shaft. ..

[0012]

[Action]

 In the configuration in which the arm that supports the rack and presses the screw shaft is divided into the first arm that only supports the rack and the second arm that applies the pressing force, only the second arm is replaced. It is possible to adjust the pressing force by using the insert and eliminate the insert molding of the arm and the rack.

[0013]

【Example】

 FIG. 1 is a perspective view showing an embodiment of the present invention. In the figure, the same components as those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the rack 9 has an overhanging portion on its side surface, and a supporting arm 9 a extends from the overhanging portion to below the carriage 3. The elastic elastic arm 8 made of metal presses the rack 9 from below, and the rack 9 is meshed with the screw shaft.

FIG. 2 is a view of the embodiment of FIG. 1 viewed from the direction of arrow A.

The support arm 9 a and the elastic arm 8 are fixed to the bottom surface of the carriage 3 by screws 10 so that the teeth of the rack 9 are in a position where they mesh with the screw shaft 1.

FIG. 3 is a diagram showing the rack 9 and elastic arm portions when the rack 9 is not meshed with the screw shaft 1, where (A) is a side view and (B) is its side view. The bottom view of is shown.

As shown in (A), in a state where the rack 9 is not meshed with the screw shaft 1, the rack 9 is located at a position slightly tilted upward from the meshed state. This is due to the shape of the elastic arm 8, and when the rack 9 meshes with the screw shaft 1, the elastic arm bends and a force for pressing the rack 9 against the screw shaft 1 is generated.

Further, as shown in (B), the rack 9 and the support arm 9 a are made of an integral resin molded product, and the support arm 9 a extends from the overhanging portions provided on both side surfaces of the rack 9. I have put it out. The central portion of the support arm 9a is thinly formed, and has a structure that only supports the rack 9. According to the support arm 9a having such a shape, there is almost no elasticity in the direction of pressing the rack 9 against the screw shaft 1, and the pressing force is set only by the elastic arm 8. The structure in which the support arm 9a is formed flat in the moving direction of the rack 9 and extends from both side surfaces of the rack 9 has rigidity in the moving direction of the rack 9, that is, the moving direction of the carriage 3. Therefore, the support arm 9a does not bend in the moving direction of the carriage 3, and the force in the moving direction of the rack 9 can be reliably transmitted to the carriage 3.

Since the rack 9 and the support arm 9a are resin molded products, the shape of the teeth of the rack 9 can be easily molded, and the rack 9 and the screw can be screwed depending on the lubricity of the resin material (polyacetal) used. It is possible to reduce the friction of the meshing portion with the shaft 1.

In addition, although the present embodiment shows the adaptation of a CD / ROM (compact disc / read only memory) equipped with a reproducing head to a reproducing device, it is also possible to use only for recording or for both recording and reproducing. It can also be applied to a disk device equipped with a head capable of performing.

[0022]

[Effect of the device]

 As described above, according to the present invention, the function of the arm that connects the rack and the carriage is divided into the support arm that transmits the force in the moving direction of the carriage and the elastic arm that presses the rack against the screw shaft. By using a separate part, the pressing force of the rack can be adjusted by exchanging only the elastic arm, which facilitates the adjustment. In addition, the arm does not need to be insert-molded in the rack, which reduces the manufacturing cost for insert molding.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a view seen from the direction of arrow A in FIG.

FIG. 3 is a view showing a state where the rack of FIG. 1 is not meshed with a screw shaft.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 Rack 2 Guide Shaft 3 Carriage 4 Optical Head 5 Optical Pickup 6 Arm 7 Rack 8 Elastic Arm 9 Rack 9a Support Arm 10 Screw

Claims (1)

[Scope of utility model registration request] 1. A rack having a recording and / or reproducing head mounted thereon and having an arm made of an elastic member is engaged with a rack fixed to the tip of the arm, and the carriage is rotated by rotating the screw shaft. In a carriage feed mechanism that moves along a guide shaft, a configuration is provided in which a first arm that connects the rack and the carriage and a second arm that is an elastic member that presses the rack against the screw shaft are provided. The carriage feed mechanism.