JPH0519906Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a so-called cartridge tape in which a magnetic tape is housed in a thin box-shaped case.
This invention relates to a mechanism for guiding the magnetic tape so that it passes through a contact position with a magnetic head at the center of the front surface of the case.

[Prior art and its problems]

The so-called cartridge tape is also commonly called a cassette tape, and as shown in FIG.
b is pivoted, and the magnetic tape 3 is wound between them.By loading the entire case 1 into a tribe (not shown, the same applies hereinafter) such as a tape recorder, the magnetic tape 3 can be wound and wound. It is now possible to return it. In this cartridge tape, the magnetic tape 3 unwound from one reel 2a is attached to the guide rollers 4 on both sides of the front part of the case 1.
a and 4b, and after passing through the front side of the case 1 between them, it is wound onto the other reel 2b. A magnetic head insertion window 5 is provided in the center of the front of the case 1.
When loading the drive, the magnetic head 6 inserted from here comes into contact with the pad 7 with the magnetic tape 3 interposed therebetween, and in this state recording, reproduction, etc. on the magnetic tape 3 are performed.

In the conventional general cartridge tape,
Cylindrical bodies with smooth contact surfaces are used as the guide rollers 4a and 4b. However, with such guide rollers 4a and 4b, the running of the magnetic tape 3 tends to become unstable due to slips, air entrainment, and the like.

So far, guide rollers 4a and 4b with grooves and protrusions formed on their circumferential surfaces have been proposed. For example, in Technical Report 82-7574 published by Japan Institute of Invention and Innovation, the outer circumference of the rollers is similar to that of automobile tires. In addition, in Japanese Utility Model Application Publication No. 58-25786, a rubber coating with a cut pattern formed thereon is shown, and in addition, in Japanese Utility Model Application Publication No. 58-25786, a roller with many grooves inclined downward to the right and downward to the left with respect to the circumferential direction is shown on the circumferential surface of the roller. A net-like structure is shown. Furthermore, Japanese Utility Model Application Publication No. 56-115788 discloses a guide roller in which grooves with opposite slopes are formed from the center to both ends.

[The problem that the idea attempts to solve]

However, magnetic tape is susceptible to wobbling in its width direction, especially when it is subjected to a slight external force while running at high speed. On the other hand, the rollers described above cannot prevent such wobbling. Furthermore, air caught between the roller and the magnetic tape cannot escape.

Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional cartridge tapes.

[Means to solve the problem]

That is, the gist of the means adopted in the present invention to solve the above object is that a pair of guide rollers 4 are rotatably arranged symmetrically on both sides of the front part of the case.
In the cartridge tape tape guide mechanism that guides the magnetic tape 3 to the front of the case 1 with the guide rollers 4a and 4b, the circumferential surfaces of the guide rollers 4a and 4b have an apex T in the center, and both ends of the guide rollers 4a and 4b are A plurality of grooves 8, 8 have a symmetrical shape in which the inclinations with respect to the circumferential direction are opposite to each other on the sides, and are continuous from one end side to the other end side of the guide rollers 4a, 4b.
A tape guide mechanism for a cartridge tape is characterized in that... is provided at a constant pitch.

[Effect]

In the above cartridge tape, magnetic tape 3
When the guide rollers 4a, 4b are run, a suitable amount of friction is applied by the grooves 8, 8, . . . provided on the guide rollers 4a, 4b, and this friction force acts along the grooves 8, 8, . These grooves 8, 8... have an apex T at the center, and both ends are symmetrical with respect to the center, so that among the frictional force acting on the magnetic tape 3, the magnetic tape 3 The component force acting in the width direction of the guide rollers 4a, 4b is in the opposite direction on both sides of the center of the guide rollers 4a, 4b.
Balanced at the center of 4b. This makes it possible to prevent blurring due to shifts in the width direction of the magnetic tape 3.

Furthermore, during high-speed winding, the magnetic tape 3
When air is caught between the back surface of the guide rollers 4a and 4b and the circumferential surfaces of the guide rollers 4a and 4b, the air is pushed out along the guide rollers 4a and 4b to both sides with the apex T as the border, and the magnetic tape is no longer in contact with the air. It escapes from both ends of the guide rollers 4a and 4b. For this reason,
It is possible to prevent the magnetic tape 3 from floating or slipping from the guide rollers 4a, 4b due to so-called air entrainment.

〔Example〕

Hereinafter, the configuration of this invention will be explained in detail based on illustrated embodiments.

The guide mechanism according to this invention has a guide roller 4
Grooves 8, 8... having an apex T in the center and having opposite inclinations with respect to the circumferential direction on both sides are provided on the circumferential surfaces of a and 4b, and on the side where the tapes of the same circumferential surface contact. , the guide rollers 4a, 4 so that the apex T faces the magnetic head insertion window 5 side.
b is pivoted. The grooves 8, 8... are
All of them are formed over the entire length of the guide rollers 4a, 4b, and both ends thereof reach both ends of the guide rollers 4a, 4b, respectively.

To explain this configuration more specifically using the illustrated embodiment, as shown in FIGS. 3 and 4,
On the circumferential surfaces of the guide rollers 4a, 4b, V-shaped grooves 8, 8, . These guide rollers 4a, 4b are arranged so that the apexes T of the grooves 8, 8, . It is pivoted. Therefore, in the state of FIG. 2 when the cartridge tape is viewed from the front, the grooves 8, 8, . . . of the guide rollers 4a, 4b...
The vertices of the two are facing each other.

The shape of the grooves 8, 8, . . . may be, for example, a U-shape other than the illustrated V-shape. Groove 8, 8
As shown in FIG.
When the length of 8... is l, it is desirable that p=l/n (where n is a positive integer, n=1, 2...). By doing this, the guide roller 4
When a straight line L is drawn in the width direction at any position on the circumferential surface of a, 4b, the same straight line L always has a certain number,
That is, it intersects the grooves 8, 8, . . . at 2×n points. Therefore, any position on the same circumferential surface can be equally affected by the grooves 8, 8, . . ., which will be described later.
For example, in the case shown, P=l/1, so
The straight line L always has two points of intersection with the grooves 8, 8.

With these guide rollers 4a and 4b, the magnetic tape 3
When guiding the magnetic tape 3, the rollers 4a, 4b have appropriate frictional resistance against the magnetic tape 3 due to the grooves 8, 8, . . .
4b and runs in the direction of the arrow in FIGS. 3 to 5, grooves 8, 8...
Component forces act on the rollers 4a, 4b from both sides toward the center along the direction. Therefore, the running magnetic tape 3 does not slip and is always located at a position where the above component forces are balanced, that is, the guide rollers 4a and 4.
The vehicle will now travel while being maintained in the center of point b. Also, even when running at high speed, the magnetic tape 3
Since the air that is about to be caught between the guide rollers 4a and 4b escapes through the grooves 8, 8, . . . , the so-called air entrainment phenomenon does not occur.

[Effect of idea]

As explained above, according to this invention, the magnetic tape 3 can be run in a stable state,
In particular, among the frictional forces acting between the magnetic tape 3 and the guide rollers 4a, 4b, the component force acting in the width direction of the magnetic tape 3 can be balanced at the center of the guide rollers 4a, 4b. Therefore, the magnetic tape 3 can be prevented from shaking. Therefore, magnetic tape 3
It is possible to prevent deviation, meandering, etc. of the magnetic head 6, and to obtain a good contact state with the magnetic head 6.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; Fig. 1 is a plan view showing one side of the case opened, Fig. 2 is a front view of the case, and Fig. 3 shows a guide roller. A front view, FIG. 4 is a sectional view taken along the line A-A in FIG. 3, and FIG. 5 is a developed view of the circumferential surface of the guide roller. 1... Case, 3... Magnetic tape, 4a, 4b
...Guide roller, 5...Magnetic head insertion window, 6
...Magnetic head, 8...Groove, T...Top of the groove.

Claims (1)

[Scope of utility model registration request] A pair of guide rollers 4a and 4b are rotatably arranged symmetrically on both sides of the front of the case to hold the magnetic tape 3.
In the tape guide mechanism for guiding the cartridge tape to the front of the case 1, the guide roller 4
The circumferential surfaces of the guide rollers 4a and 4b have an apex T at the center, and are symmetrical with opposite inclinations in the circumferential direction from the center to both ends, and from one end of the guide rollers 4a and 4b to the other. A tape guide mechanism for a cartridge tape, characterized in that a plurality of grooves 8, 8, .