JPS62129966A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To improve run performance and to obtain superior stability by arranging a cassette guide post right behind a tape leading-out position so that it is inscribed with plural common tangents formed other tape guide members on a tape run path. CONSTITUTION:The position of a P5 post 16 in a lead-out state is so set that the post is inscribed with both the prolongation of a common tangent contacting a tape path consisting of a P4 post 13 and a capstan shaft 14 and the prolongation of a common tangent on a tape path formed of a cassette guide post 17 and a cassette roller 18. Consequently, the quantity of winding of a tape around the pinch roller 15 is minimized to make a tape squeal hard to generate and reduce the influence of the roller 15 and post 17, thereby stabilizing a opposite- directional tape run including opposite-directional fast reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to magnetic tape devices such as cassette audio or video tape recorders.

BACKGROUND OF THE INVENTION Recently, the penetration rate of video tape recorders has exceeded 3Q%, and competition in product development has become even more intense. On the one hand, they aim for lower prices, and on the other hand, they aim for higher quality.

An example of a conventional magnetic tape device (video tape recorder) will be described below with reference to the drawings. FIG. 5 is a plan view showing the tape running state of a conventional video tape recorder. In Figure 6, 13 is the P4 post, 14 is the capstan shaft, 15 is the pinch roller, and 16 is the P4 post.
5 boss, 1 holder is a cassette guide post (5), 18 is a cassette row 2, 19 is a tape, 20 is a take-up reel, and 21 is a cassette. 6 and 7 are enlarged plan views of the vicinity of the pinch row 215 of a conventional video tape recorder, respectively. Indicates playback or high-speed playback (Cue/Rev) status.

In FIG. 6, the P5 boss 16 is located inside the cassette 21, and when the playback mode is entered, the tape 19 is transferred to the cassette 21.
The tape is gradually pulled out to the outside and guided to the position shown in FIG. 7 to form a tape running path. In this state, high-speed playback (
The same applies to the high speed search) mode. Furthermore, during the so-called continuous shooting operation in the recording/Bose mode, the pinch roller 16 is generally separated from the capstan 14 in a standby state, as shown by the two-dot chain line in FIG. As the pinch roller 15 moves at this time, the tape path between the P4 post 13, the capstan 14, and the P6 post 16 also changes from the solid line to the state shown by the two-dot chain line.

Problems to be Solved by the Invention However, in the above configuration, the position of the P5 post 16 after the tape is pulled out is the two tape guide members immediately in front of it. P4 boss 13 and Cagsten shaft 1
4, the capstan shaft 14 and P6
The tape and the pinch row 215 come into contact between the posts 16 at a large wrapping angle θ (approximately 73° in the conventional example). As is well known, since the pinch roller 15 is generally made of rubber and is an elastic body, it deforms when a load (in this case, pinch roller pressure force) is applied, and the runout and surface roughness of the outer periphery are different from those of other tape guide members. It's thicker than that. Therefore, when running the tape, it is desirable to minimize the wrapping angle between the tape and the pinch roller, but as mentioned above, in the conventional example, the wrapping angle θ≠73°, which is large, so it is not affected by the pinch roller. Cheap. Specifically, the tape tends to squeal due to the tape being pressed against the pinch roller, and as a father, the problem is that the running becomes unstable when running in reverse. Furthermore, as mentioned above, there is a difference in the tape path between the standby state in the recording/Bose mode and the recording/playback state, so there is also the problem that it is difficult to maintain the accuracy of continuous shooting.

In view of the above-mentioned problems, the present invention positions the P5 post after the tape is drawn out so that the wrapping angle between the tape and the pinch roller is extremely small, and the wrapping angle with the guide post in the cassette is also extremely small. This setting provides a magnetic tape device with improved running performance and excellent stability.

Means for Solving the Problems In order to solve the above problems, the magnetic tape device of the present invention includes a cassette mounting means, a tape drawing means, and a tape transporting means. a drawer arm having a tape guide post which is located at the first position and is movable to a second position outside the cassette when the tape is drawn out; A plurality of common tangents each formed from a plurality of other tape guide members,
It is completely equipped with a tape guide post arranged at a position that is approximately inscribed.

Effects The present invention has the above-described configuration, so that the angle at which the tape is wrapped around the pinch roller during tape running is extremely small, thereby making it possible to eliminate the adverse influence of the shibinter roller on the tape. In other words, it is possible to prevent tape squeal, improve reverse running performance, and furthermore improve the accuracy of continuous shooting.

Embodiments Hereinafter, magnetic tape devices according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a tape running state of a magnetic tape device in an embodiment of the present invention. In Fig. 1, 12 is the A/C head, 13 is P4
14 is a capstan shaft, 15 is a reed with pinch row 2, 16 is a P6 post, 17 is a cassette guide post (R), 18 is a cassette roller, 19 is a tape,
20 is a take-up reel, and 21 is a cassette. FIG. 2 shows a pinch roller 1 of a magnetic tape device according to an embodiment of the present invention.
6 is an enlarged plan view of the vicinity of P5 post 16, showing the state when P5 post 16 is in the first position within the cassette. In Fig. 2, 22 is a pinch arm, 23 is a pinch sub arm,
24 is a pinch pressure spring, 26 is a P5 kick arm, 26 is a P5 arm, and 27 is a pinch cam. FIG. 3 shows an enlarged plan view of the vicinity of the pinch roller 16 in a stopped state, and similarly, FIG. 4 shows an enlarged plan view of the vicinity of the pinch roller 15 in a reproducing state. As shown in FIG. 1, in the magnetic tape device according to the embodiment of the present invention, the position of the capstan shaft 14 is different from that of the conventional example, and is disposed outside the cassette 21.

The operation of the magnetic tape device configured as described above will be described below with reference to FIGS. 2 to 4. FIG. 2 shows the state immediately after the cassette 21 has been placed in a predetermined position by a dedicated mounting device or the like. The P6 post 16 is located within the cassette 21 and is referred to as the first position. In this state, the shipinte cam 27 begins to rotate in the direction shown by the arrow in the figure, and due to the action of the end cam, the P5 kick arm 25
rotates, and in conjunction with this, the P5 arm 26 rotates and begins to pull out the tape 19. When the tape has been pulled out to the state shown in FIG. 3, the pulling out operation of the P5 arm 26 is stopped. This state is the stop mode. P5 at this time
The position of the post 16 is in contact with a common tangent line connecting the cassette guide post 17 and the cassette roller 18. That is, when the tape 19 is pulled out from the cassette, the tape 19 stops exactly at the point where the wrapping angle around the cassette guide post 17 is zero.

Note that the same position is also used in the high-speed feed (FF, REW) mode.

Next, when the playback button is pressed, the pinch cam 27 begins to rotate again in the direction of the arrow in the figure, and the pinch row 215 begins to descend by the guide groove provided on the end face. At this time, tape loading into the cylinder 8 is also started. When the lowering is completed, the pinch sub-arm 23 is rotated by the end cam, and the pinch arm 22 is also rotated accordingly, the pinch roller 15 is pressed against the capstan shaft 14, and the regeneration operation is started.

FIG. 4 shows this state. In FIG. 4, the pinch roller 215 shown by a solid line is in a playback state, and the pinch roller 15 shown by a two-dot chain line is in a recording/bose state. P5
As can be seen from the figure, the position of the post 16 is set to be in contact with an extension of the common tangent line connecting the P4 boat 13 and the capstan shaft 14. As a result, the P5 post 16 is set to 2 points each in front and behind the P5 post, in conjunction with the above conditions.
It is located at a position tangent to two common tangent lines formed by two tape guide members.

In this state, the wrapping angle θ of the tape 19 with respect to the pinch roller 15 becomes the minimum, and therefore, there is almost no difference in the tape path between when the pinch roller 15 is pressed and when it is separated.

As described above, according to this embodiment, the position of the P5 post 16 in the pulled out state is determined by the extension line of the common tangent to the tape path composed of the P4 post 13 and the capstan shaft 14, and the cassette guide post 16. ) 17 and the extension line of the common tangent on the tape path formed by the cassette roller 18, the amount of tape wrapped around the pinch row 215 during the pressing operation of the pinch roller 15 is minimized. Therefore, playback and high-speed playback (Cue
/Rev), the tape squeal is less likely to occur, and the effect is particularly great during reverse high-speed playback (Rev).

Further, tape running in the opposite direction including the pinch roller 16 and the cassette guide post is stabilized. Furthermore, pinch roller 1
The accuracy of splicing from normal recording/pause in which the camera is kept at a distance is also improved, and image disturbances at the spliced portions are greatly reduced.

In this embodiment, the second position of the P5 post 16 is arranged so as to be completely inscribed in two common tangent lines formed by two tape guide members immediately before and after the tape running path. However, it does not necessarily have to be completely inscribed, but it may be in the vicinity, and even if it is in contact with either one of the tangent lines, it does not have to be in contact with either.

Effects of the Invention As described above, according to the present invention, the cassette mounting means, the tape drawing means, and the tape transporting means are provided, and the tape is located at the first position in the cassette before the tape is drawn out, and the cassette is placed in the first position when the tape is drawn out. a drawer arm having a tape guide post that is movable to a second position on the outside; and a drawer arm having a tape guide post that is movable to a second position; By having a tape guide post arranged at a position that is approximately inscribed in the plurality of common tangent lines that are pre-shaped in Gojime φ Okitanryo d,
It is possible to simultaneously minimize the amount of tape wrapped around the pinch roller and cassette guide post during tape transfer, and it is possible to prevent tape squealing during playback and high-speed playback (Cue/Rev). High-speed playback (Re
v) It is also possible to stabilize the tape running in the opposite direction, including the above. Furthermore, an excellent effect can be obtained in that the accuracy of continuous shooting from a recording/pause state that involves pressing and separating the pinch rollers can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the tape running state of a magnetic tape device in an embodiment of the present invention, FIGS. 2, 3, and 4.
The figure is an enlarged plan view of the vicinity of the pinch roller in each state of a magnetic tape device according to an embodiment of the present invention, and FIGS. 5, 6, and 7 are main views showing each state of a conventional magnetic tape device. FIG. 13...P4 boss, 14...capstan shaft, 15...pinch loaf, 16...
...P5 boss, 1 ... Cassette guide post (R), 18 ... Cassette roller, 19.
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Claims (1)

[Claims] It is equipped with a cassette mounting means, a tape drawing means, and a tape transporting means, and the first tape in the cassette before drawing out the tape.
a drawer arm having a tape guide post which is located at a position and is movable to a second position outside the cassette when the tape is drawn out; and a drawer arm having a tape guide post located immediately before and immediately after the tape running path at the second position of the tape guide post. A magnetic tape device comprising: a tape guide post disposed at a position substantially inscribed in a plurality of common tangent lines formed from a plurality of other tape guide members.