JPH0433571Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a tape guide roller unit used in a VTR or the like.

[Conventional technology]

Generally, a tape guide roller placed near a magnetic head of a VTR or the like is configured as a unit as shown in FIG. 5, for example, and is attached to the main body of the VTR. In the figure, 1 is the shaft,
Reference numeral 2 denotes a threaded sleeve that is fitted into the lower part of the shaft 1 and whose outer peripheral portion is screwed onto the female threaded portion 3a of the VTR main body 3; 4 is the threaded sleeve 2;
A lower flange 5 is fitted onto the shaft 1 on the upper side and determines the lower limit position of the guide roller described later, and a lower flange 5 is loosely fitted on the shaft 1 on the upper side of the lower flange 4.
A cylindrical tape guide roller 6 that rotates to guide the magnetic tape T on the outer circumferential surface 5a is fitted on the upper side of the shaft 1 above the guide roller 5, and determines the upper limit position of the guide roller 5 and also controls the upper limit position of the guide roller 5. As shown in Fig. 6, a cross groove 6a into which the tip 7a of the flange press-fit rotating tool 7 is fitted.
These upper flanges constituted the tape guide roller unit 8. The tape guide roller unit 8 is assembled by sequentially press-fitting or loosely fitting the lower flange 4, guide roller 5, upper flange 6, and threaded sleeve 2 onto the shaft 1. In order to rotate smoothly, the upper flange 6 is gradually moved downward so that the distance l ₁ between the upper surface of the lower flange 4 and the lower surface of the upper flange 6 is the length of the guide roller 5.
It was adjusted so that it was slightly larger than l ₂ .

[Problem that the invention attempts to solve]

However, in the conventional tape guide roller unit 8, the distance _l1 is adjusted by fitting the tip 7a of the flange press-fit rotating tool 7 having the shape shown in FIG. 6 into the cross groove 6a of the upper flange 6. Upper flange 6 by flange press-fit rotating tool 7
Because this was done by rotating and pushing down the upper flange 6, the shape of the upper flange 6 was significantly different from that of the lower flange 4. As a result, the number of types of component parts increased, resulting in high costs. It was hot. In addition, the upper flange 6 is a small component and requires cutting as it has the cross groove 6a on the top surface as described above, so there is a problem that manufacturing is troublesome and costs are high. Furthermore, since the shapes of the upper and lower flanges 6 and 4 are different as described above, it is necessary to select the upper and lower flanges during assembly, and furthermore, both of the upper and lower flanges 6 and 4 are vertically asymmetrical in shape, and the press-fit direction is different. Since the direction is fixed, the direction of press-fitting must be selected so as not to reverse the direction during assembly, which poses a problem in that the assembly process is time-consuming.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a tape guide roller unit that is inexpensive to manufacture and can be assembled quickly.

[Means and actions for solving problems]

The tape guide roller unit according to the present invention includes a shaft, a tape guide roller that is loosely fitted onto the shaft and guides a magnetic tape, and a tape guide roller that is press-fitted onto the shaft and has the same shape to determine the upper and lower limit positions of the guide roller, respectively. In a tape guide roller unit equipped with an upper flange and a lower flange, the upper and lower flanges are of the same flat plate shape, and the outer shape is a regular polygon into which the tip of a rotary press-fitting tool can fit. This reduces the number of types of component parts, allows the upper and lower flanges to be manufactured by press working, and eliminates the need to select the upper and lower flanges and the press-fitting direction during assembly.

〔Example〕

Hereinafter, the tape guide roller unit of the present invention will be described in detail based on an embodiment shown in FIGS. 1 to 4, with the same members as in the conventional example described above being designated by the same reference numerals. Incidentally, the shaft 1, threaded sleeve 2, and tape guide roller 5 are the same as those in the conventional example, so their explanation will be omitted.

FIG. 1 is a partially cutaway side view of the tape guide roller unit of the present invention. As shown in FIGS. 2 and 3, the upper flange 9 and the lower flange 10 are the same flat plate-like objects that are vertically symmetrical, and their external shape is similar to that of the tip recess 11a of the rotary press-fitting tool 11 as shown in FIG.
It has a regular hexagonal shape so that it can fit together. Also, the fitting holes 9a, 10a of these upper and lower flanges 9, 10
Tapered portions 9a' and 10a' are provided at both upper and lower ends of the holder, respectively.

The tape guide roller unit according to the present invention is constructed as described above, and its assembly is performed in the same manner as in the conventional example, but since the upper flange 9 and the lower flange 10 are the same, the types of component parts are different. This will reduce costs. Furthermore, since the upper and lower flanges 9 and 10 are vertically symmetrical flat plate-like objects, they can be press-formed, making manufacturing easy and inexpensive. Furthermore, as mentioned above, the upper and lower flanges 9 and 10
Since the shapes of the upper and lower flanges are the same, there is no need to select the upper and lower flanges during assembly.
Since the shape of 0 is vertically symmetrical, there is no need to select the press-fitting direction, and therefore the assembly work can be performed quickly. In addition, the fitting holes 9 of the upper and lower flanges 9 and 10
There are tapered parts 9a', 10 at both upper and lower ends of a, 10a.
Since a' are provided respectively, press-fitting into the shaft 1 becomes easy, and the assembly work can be made even faster.

It goes without saying that the upper and lower flanges 9, 10 may have other polygonal shapes as long as they match the shape of the tip recess 11a of the rotary press-fitting tool 11.

[Effect of idea]

As mentioned above, the tape guide roller unit according to the present invention has the important practical advantages of low manufacturing cost and quick assembly.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of an embodiment of the tape guide roller unit according to the present invention, Fig. 2 is an enlarged plan view of the upper and lower flanges in the above embodiment, and Fig. 3 is taken along the - line in Fig. 2. 4 is a perspective view of a rotary press-fitting tool used for assembling the above embodiment, FIG. 5 is a sectional view of a conventional tape guide roller unit, and FIG. 6 is a diagram of the tape guide roller unit of FIG. 5 and its assembly. FIG. 2 is a perspective view of a rotary press-fitting tool used for 1...Shaft, 2...Threaded sleeve, 5
...Tape guide roller, 9...Top flange,
10... lower flange, 9a, 10a... fitting hole,
9a', 10a'...Tapered portion, 11...Rotary press-fitting tool, 11a...Tip recessed portion.

Claims (1)

[Scope of utility model registration request] A shaft, a tape guide roller that is loosely fitted onto the shaft and guides the magnetic tape, and an upper flange and a lower flange of the same shape that are press-fitted onto the shaft and determine upper and lower limit positions of the guide roller, respectively. In the tape guide roller unit, the upper flange and the lower flange are formed into a flat plate shape, and the outer shape is formed into a regular polygon into which the tip of a rotary press-fitting tool can fit. roller unit.