JPH0227412Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic tape guide, particularly a tape guide used in a VTR.

A conventional magnetic tape guide of this type will be described with reference to FIG. 1. A guide roller 2 made of a non-magnetic material and rotatably fitted on a shaft 1 is as follows:
Movement in the axial direction is prevented by stoppers 3 and 4 press-fitted onto the shaft 1 close to both ends of the roller 2, and one stopper 4 has a guide for attaching the guide to a mounting base (not shown). A sleeve portion 6 having a threaded outer periphery is integrally formed with the sleeve portion 6. The stoppers 3 and 4 are made of hard stainless steel to prevent wear due to friction with the magnetic tape.
In order to prevent deformation when press-fitting the sleeve part 6, the shaft 1 is also made of the same stainless steel.Furthermore, in order to make the press-fitting of the stopper 4 as easy as possible, a small gap is created between the sleeve part 6 and the shaft 1. It is formed like this.

The conventional guide described above has disadvantages in that the sleeve portion 6 is easily deformed when the stopper 4 is press-fitted (i.e., during assembly), and the screws formed on the outer periphery are also easily damaged, and the sleeve 6 is made of stainless steel. There were drawbacks such as the fact that thread cutting was time-consuming. Furthermore, if the guide mounting base and the guide roller 2 are further apart, the sleeve part 6 and the stopper 4 are integrated, so the sleeve part 6 needs to be made longer, which increases the cost and increases the product quality. Limited by design.

In addition, in order to eliminate the above-mentioned drawbacks, the stopper 4 and the sleeve part 6 shown in FIG. are each formed with a fitting piece that can be inserted into and removed from the groove, and engage the two pieces 4 and 6 like a clutch, and when the guide is attached to the mounting base, the shaft 1 is tensioned with a spring in the direction of the mounting base. There is a way to do it.

However, with such a configuration, the VTR
Until the sleeve part 6 is attached to the stopper 4, the number of parts increases as the sleeve part 6 separates from the stopper 4, making it difficult and inconvenient to handle during packaging and equipment assembly. Grooves are difficult to form, causing variations in the molding accuracy of the product, and the manufacturing process is labor-intensive, leading to high costs. Furthermore, when the sleeve portion 6 is engaged with the stopper 4 in a clutch-like manner, the attachment position of the sleeve portion 6 to the shaft 1 is restricted to the attachment position of the stopper 4 to the shaft 1.
The length of the sleeve portion 6 must be set according to the distance between the position of the lower end of the guide roller 2 and the mounting base of the guide. If the distance is large, more material is required for the sleeve portion 6. ,
Guides are expensive.

Furthermore, if a high degree of precision is required for the product, it may be necessary to thread the mounting sleeve around the outside after mounting it on the shaft.
In all of the conventional guides mentioned above, this is difficult because there is a gap between the sleeve and the shaft.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, namely, to reduce the deformation or damage of the sleeve part and the threads on its outer periphery during assembly, to make it easier to thread the sleeve, and to produce highly accurate threads. It is an object of the present invention to provide a magnetic tape guide that can be formed easily, is easier to assemble, and is easier to handle.

An embodiment of the present invention will be described below. FIG. 2 shows one example, in which a guide roller 2 made of synthetic resin or other non-magnetic material is loosely fitted in a part of the shaft 1 made of stainless steel so as to be freely rotatable. , collar-shaped stoppers 3 and 4 made of stainless steel are press-fitted close to both ends of the roller 2, and a screw is formed on the outer periphery of the other part of the shaft 1, which is separate from the stopper 4. A sleeve 5 made of brass is press-fitted and fixed. For the sleeve 5, other than brass, a similar soft metal is suitably used. The guide roller 2 may be subjected to antistatic processing to prevent the generation of static electricity. Furthermore, the position at which the sleeve 5 is fixed to the shaft 1 is as follows:
It is set appropriately depending on the design of the VTR, etc.

The magnetic tape guide according to the present invention described above has the following effects.

(1) Since the sleeve 5 is separate from the stopper 4 and press-fitted onto the shaft 1, deformation of the sleeve 5 during guide assembly is extremely rare, and the threads on its outer periphery are hardly damaged.

(2) Since the sleeve 5 is made of brass or other soft metal, it is easy to form threads on the outer periphery, and it is also easy to form highly accurate threads, and it is easy to press fit into the shaft 1, reducing assembly costs. This also reduces assembly accuracy and improves assembly accuracy.

(3) Although the stopper 4 and the sleeve 5 are separated, the sleeve 5 is press-fitted into the shaft 1 and the entire guide is a single component, making it extremely easy to handle during packaging, equipment assembly, etc.

(4) Since the sleeve 5 is not engaged with the one stopper 4 in a clutch-like manner, but is press-fitted into the shaft 1, the one stopper 4
The mounting position of the sleeve 5 on the shaft 1 can be set according to the distance between the guide roller 2 and the mounting position of a guide in a VTR or the like.

(5) Since the sleeve 5 is press-fitted onto the shaft 1, if necessary, after the sleeve 5 is fixed to the shaft 1, a thread can be formed on its outer periphery.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional magnetic tape guide.
FIG. 2 is a sectional view showing an example of the guide according to the present invention. Explanation of main symbols in the figure: 1 is a shaft, 2 is a guide roller, 3 and 4 are stoppers, and 5 is a sleeve.

Claims (1)

[Scope of utility model registration request] A shaft 1 made of stainless steel and this shaft 1
a guide roller 2 made of a non-magnetic material which is rotatably loosely fitted to a portion of the shaft 1; a collar-shaped stopper 3 made of stainless steel which is press-fitted to a portion of the shaft 1 close to both ends of the guide roller 2; 4, and a sleeve made of brass or other soft metal, which is separate from the stoppers 3 and 4 and has a thread formed on its outer periphery, is press-fitted and fixed to other parts of the shaft 1. Guide for.