JPH09212958A - Adjusting device for height of guide post - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device which eliminates a need of a screw cutting operation, which abolishes a spacer and which can adjust the height of a guide post component by a method wherein a protrusion part is formed on the inner circumferential face of a screw-part insertion hole at an adjusting nut molded with an elastic member. SOLUTION: A rose-shaped protrusion part 14c is formed on the inner circumferential face of an insertion hole 14b into which a screw part 12a of a shaft 12 is inserted on a resin adjusting nut 14. When the rose-shaped protrusion part 14c is assembled and adjusted, the adjusting nut 14 is turned with reference to the shaft 12, a screw is formed according to the screw shape of the screw part 12a of the shaft 12. In addition, a straight part 12b whose diameter is smaller than that of the screw part 12a is formed at the upper part of the screw part 12a of the shaft 12, and a guide hole 14d which is guided to the straight part 12b is made in the upper part of the insertion hole 14b in the adjusting nut 14. A guide post component 11 is inserted into the shaft 12, the adjusting nut 14 is turned against the urging force of a spring 13, and the height position of the guide post component can be adjusted and fixed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a VTR (Vide).
The present invention relates to a height adjusting device for a guide post in a cassette tape running system used in a magnetic recording / reproducing device such as a Tape Recorder.

[0002]

2. Description of the Related Art A conventional height adjusting device for a guide post of this type will be described below with reference to FIG. Here, FIG.
FIG. 2A is a plan view showing a schematic configuration of a conventional guide post height adjusting apparatus, and FIG. 2B is a partial sectional side view showing a schematic configuration of a conventional guide post height adjusting apparatus.

In FIG. 2, reference numeral 1 is a guide post assembly for regulating the running height of a cassette tape (not shown),
Reference numeral 2 denotes a shaft which is attached to the main chassis and into which the guide post assembly 1 is inserted, and which has a screw portion 2a on its upper portion. 3 is a spring for applying an urging force upward from the lower part of the guide post assembly 1 and 4 is a metal member which is screwed into the threaded portion 2a of the shaft 2 and pushes down the guide post assembly 1 against the urging force of the spring 3. It is an adjustment nut.

Numeral 5 is a spacer having a convex portion 5a for removing play between the guide post assembly 1 and the shaft 2.
It is inserted between the guide post assembly 1 and the adjusting nut 4.

In the height adjusting device of the guide post constructed as described above, the adjusting nut 4 is screwed into the threaded portion 2a of the shaft 2 and rotated to resist the urging force of the spring 3. By pushing down the post assembly 1, the height of the guide post can be adjusted. After the height of the guide post is adjusted, a screw lock (not shown) is applied to prevent the adjustment nut 4 from loosening.

A guide roller mounting device using an elastic body is disclosed in Japanese Patent Laid-Open Nos. 5-174457 and 5-2.
It is proposed in Japanese Patent No. 42570. By providing an elastic body such as nylon in a part of the screwing mechanism that attaches the guide roller, the horizontal fixing screw is eliminated, the vertical movement of the guide roller is prevented, and external vibration is attenuated. It is possible to do.

[0007]

However, in the case of the conventional height adjusting device for the guide post described above, the adjusting nut 4 and the spacer 5 must be used as separate parts, and the fixing nut 4 is fixed. Since the screw lock is required and the adjustment nut 4 is made of metal, it is necessary to perform screw processing on the inner peripheral surface of the insertion hole to be inserted into the screw portion 2a of the shaft 2 of the adjustment nut 4, resulting in an increase in cost. There was a problem of inviting.

Further, in the case of the above-described conventional guide post height adjusting device, in order to remove the play between the adjusting nut 4 and the guide post assembly 1, the convex portion 5a of the spacer 5 is used. There is a problem that the guide post assembly 1 is pressed only from the direction (the position of the convex portion 5a), and the guide post assembly 1 is tilted.

Further, the above-mentioned JP-A-5-174457.
In the case of the guide roller mounting device proposed in Japanese Patent Laid-Open No. 5-242570, since an elastic body is provided in a part of the screwing mechanism, the screwing mechanism is provided in the nut portion. There is a problem that not only the peripheral surface needs to be threaded, but also the structure for providing the elastic body becomes complicated, which is disadvantageous in terms of cost.

The present invention has been made in view of the above point, and by forming the adjusting nut itself with an elastic member, it is possible to eliminate the need for screwing and to eliminate the spacer, which is very simple. It is an object of the present invention to provide a height adjusting device for a guide post that enables height adjustment of a guide post assembly with various configurations.

[0011]

A height adjusting device for a guide post according to claim 1 of the present invention comprises a shaft having a screw portion attached to a main chassis, and a guide post assembly inserted into the shaft. Adjusting the height of the guide post including an urging member that urges the guide post assembly upward and an adjusting nut that is screwed into the threaded portion of the shaft to regulate the height position of the guide post. In the device, the adjusting nut is formed of an elastic member, and is provided with a plurality of convex portions on the inner peripheral surface of the insertion hole into which the screw portion is inserted.

Thus, at the time of assembling / adjusting, by inserting the screw portion of the shaft into the insertion hole of the adjusting nut and turning it in, the convex portion of the inner peripheral surface of the insertion hole of the adjusting nut is fitted with the screw portion of the shaft. Since it is possible to form a screw according to the screw shape, it is possible to eliminate the need to form a screw when creating the adjustment nut. Further, the elasticity of the adjusting nut can fix the adjusting nut and the threaded portion of the shaft, so that the screw lock can be eliminated.

Further, in the guide post height adjusting device of the invention according to claim 2 of the present application, in the configuration of the invention of claim 1 described above, the shaft is provided with a guide portion having a diameter smaller than the screw portion, and the adjustment is performed. The nut is provided with a guide hole that is guided by the guide portion of the shaft.

With this, the guide hole of the adjusting nut is guided in the vertical direction by the guide portion of the shaft at the time of assembly and adjustment, so that it is possible to suppress the inclination of the adjusting nut when forming and fixing the screw of the adjusting nut. Become.

Furthermore, in the guide post height adjusting device of the invention according to claim 3 of the present application, in the configuration of the invention of claim 1 or 2, the guide post assembly is provided with a taper portion and an adjusting nut. The taper portion is provided in the lower part of the.

Thus, the spacer having the convex portion can be eliminated and the play of the guide post assembly can be removed. Moreover, since the taper portion of the guide post assembly and the taper portion of the adjusting nut abut circumferentially, it is possible to improve concentricity and prevent the guide post assembly from tilting.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a height adjusting device for a guide post according to the present invention will be described below with reference to FIG. Here, FIG. 1A is a plan view showing a schematic configuration of a height adjusting device for a guide post of the present embodiment, and FIG. 1B shows a schematic configuration of a height adjusting device for a guide post of the present embodiment. It is a partial cross-sectional side view.

In FIG. 1 showing the height adjusting device of the guide post of the present embodiment, 11 is a guide post assembly for regulating the running height of a cassette tape (not shown), 1
Reference numeral 2 denotes a shaft which is attached to the main chassis and into which the guide post assembly 11 is inserted, and which has a screw portion 12a on its upper portion. Reference numeral 13 is a spring that applies a biasing force upward from the lower portion of the guide post assembly 11, and 14 is a screw portion 1 of the shaft 12.
It is a resin adjustment nut that is screwed into 2a and that pushes down the guide post assembly 11 against the biasing force of the spring 13.

In the above construction, the tapered portion 11a is provided on the upper portion of the guide post assembly 11 and the tapered portion a is also provided on the lower portion of the adjusting nut 14. Here, the tapered portion 14a of the adjustment nut 14 is wider than the tapered portion 11a of the guide post assembly 11 so that the guide post assembly 11 and the adjustment nut 14 are in contact with each other in a larger circumferential shape.

A chrysanthemum-shaped convex portion 14c is provided on the inner peripheral surface of the insertion hole 14b into which the screw portion 12a of the shaft 12 of the resin adjustment nut 14 is inserted. This chrysanthemum-shaped protrusion 1
4c uses the adjustment nut 14 for the shaft 12 during assembly and adjustment.
The screw is formed in accordance with the screw shape of the screw portion 12a of the shaft 12 by turning the screw.

Further, the straight portion 12 having a diameter smaller than that of the screw portion 12a is provided on the screw portion 12a of the shaft 12.
b is provided, and a guide hole 14 that is guided by the straight portion 12b is provided above the insertion hole 14b of the adjusting nut 14.
d is provided. Here, the guide hole 14 of the adjusting nut 14
Since the diameter of d is substantially equal to the diameter of the straight portion 12b of the shaft 12, the guide hole 14d is guided by the straight portion 12b, so that the adjustment nut 14 can maintain the vertical state. .

In the guidepost height adjusting device constructed as described above, the guidepost assembly 1 is attached to the shaft 12.
After inserting 1, the adjustment nut 14 is turned against the biasing force of the spring 13 to adjust and fix the height position of the guide post.

At this time, the guide hole 14d of the adjusting nut 14
Is guided by the straight portion 12b so that the adjusting nut 14 maintains the vertical state, while the chrysanthemum-shaped convex portion 14c of the adjusting nut 14 is threaded according to the screw shape of the screw portion 12a of the shaft 12. At the same time, since the adjusting nut 14 is fixed to the screw portion 12a of the shaft 12 by the elasticity of the resin, it is possible to eliminate the conventionally required screw lock.

Further, the taper portion 14a of the adjusting nut 14
Since the tapered portion 11a of the guide post assembly 11 and the tapered portion 11a are circumferentially in contact with each other, it is possible to eliminate the conventionally required spacer, improve the concentricity, and remove the backlash. Here, since the taper portion 14a of the adjustment nut 14 has a larger angle than the taper portion 11a of the guide post assembly 11, the respective taper portions 11a and 14a come into contact with each other in a larger circumferential shape. It is possible to improve concentricity.

[0025]

The height adjusting device for a guide post according to the first aspect of the present invention has the above-described structure. Therefore, at the time of assembling and adjusting, the screw portion of the shaft is inserted into the insertion hole of the adjusting nut. By turning the screw, it is possible to form a screw according to the thread shape of the screw portion of the shaft on the convex portion of the inner peripheral surface of the insertion hole of the adjustment nut, so that there is no need to form a screw when creating the adjustment nut. be able to. Further, the elasticity of the adjusting nut can fix the adjusting nut and the threaded portion of the shaft, so that the screw lock can be eliminated.

In the guide post height adjusting device according to the second aspect of the present invention, since the guide hole of the adjusting nut is guided in the vertical direction by the guide part of the shaft during assembly and adjustment, the screw of the adjusting nut is screwed. It is possible to suppress the inclination of the adjusting nut during formation and fixing.

Further, in the height adjusting device of the guide post according to the third aspect of the present invention, the spacer having the convex portion can be eliminated and the play of the guide post assembly can be removed. Moreover, since the taper portion of the guide post assembly and the taper portion of the adjusting nut abut circumferentially, it is possible to improve concentricity and prevent the guide post assembly from tilting.

[Brief description of drawings]

FIG. 1 is a plan view (a) showing a schematic configuration of an embodiment of a height adjusting device for a guide post according to the present invention, and FIG.

FIG. 2 is a plan view (a) showing a schematic configuration of a conventional height adjusting device for a guide post, and FIG.

[Explanation of symbols]

 11 Guide post assembly 11a Tapered part 12 Shaft 12a Screw part 12b Straight part 13 Spring 14 Adjustment nut 14a Tapered part 14b Insertion hole 14c Convex part 14d Guide hole

Claims (3)

[Claims] 1. A shaft having a threaded portion attached to a main chassis, a guide post assembly inserted into the shaft, a biasing member for biasing the guide post assembly upward, and a shaft of the shaft. In a height adjusting device for a guide post, which is screwed to a screw portion and has an adjusting nut for regulating the height position of the guide post, the adjusting nut is formed by an elastic member, and the screw portion is A height adjusting device for a guide post, wherein a plurality of convex portions are provided on an inner peripheral surface of an insertion hole to be inserted. 2. The height adjusting device for a guide post according to claim 1, wherein the shaft is provided with a guide portion having a diameter smaller than a screw portion, and the adjustment nut is guided by the guide portion of the shaft. A height adjusting device for a guide post, which is provided with a hole. 3. The height adjusting device for a guide post according to claim 1, wherein a taper portion is provided on an upper portion of the guide post assembly and a taper portion is provided on a lower portion of the adjustment nut. Guide post height adjustment device.