JPH0743858B2 - Magnetic tape device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device applicable to a video tape recorder (hereinafter referred to as a VTR), and more particularly to a magnetic tape device having a small tape running load and a small size. Is.

2. Description of the Related Art In recent years, VTRs have spread to general households and are used as time shift machines for TV programs.

An example of the above-mentioned conventional VTR will be described below with reference to the drawings.

FIG. 2 is a plan view of the main part of a conventional VTR. In FIG. 2, a magnetic tape 4 is wound around a supply reel 2 and a take-up reel 3 arranged side by side in a tape cassette 1.
The magnetic tape 4 ejected from the supply reel 2 in parallel with the tape cassette 1 is guided by some guide members, the erasing head 5 and the first guide roller 6 and then twisted by the first inclined post 7 to be helically moved to the rotary head cylinder 8. Wrap around. The magnetic tape 4 coming out from the rotary head cylinder 8 is the second
After being straightened again by the inclined post 9 so as to be parallel to the tape cassette 1, the traveling direction is changed by the second guide roller 10, and the tape is attached to the fixed head 11, and then the tape cassette 1 and the pinch roller 13 are used. The magnetic tape 4 is fed into the winding head 3 and wound around the winding roll 3, and the magnetic tape 4 is wound around the rotary head cylinder 8 in a substantially M-shape.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, the first inclined post,
And because the tape wrap angle on the second inclined post is large,
Since the tape running load is large, it is considerably difficult to set the magnetic tape 4 to the rotating head cylinder 8 in the fast winding mode from the viewpoint of tape damage and power consumption.

In view of the above problems, the present invention provides a magnetic tape device that is a traveling system that is attached to a rotary head cylinder in a substantially M-shape and has a small tape traveling load.

Means for Solving the Problems In order to solve the above problems, a magnetic tape device according to the present invention comprises a tape cassette which is arranged in parallel to a first plane and has a pair of tape reels around which a magnetic tape is wound. A rotary head cylinder outside the tape cassette for winding the magnetic tape at a predetermined angle for recording and reproducing signals, and a magnetic tape pulled out from the tape cassette and wound around the rotary head cylinder in a substantially M-shape. Between the tape pulling-out means, the inclined post for twisting the magnetic tape, the traveling direction of which is parallel to the first plane from the tape reel of one of the tape cassettes, and the inclined post and the rotary head cylinder. And a first turn provided perpendicular to a second plane parallel to the running direction of the magnetic tape twisted by the inclined post. The rolling guide post and the second rotation guide post, and the running direction of the magnetic tape is made parallel to the first plane by winding the magnetic tape around the rotary head cylinder through the second rotation guide post at a predetermined angle. And a third rotation guide provided perpendicular to the first plane for tilting the cylinder so that the traveling direction of the magnetic tape parallel to the first plane is changed to the tape cassette direction. And a post.

Effect The present invention has only one inclined post with the above configuration, so that the winding angle of the tape around the fixed post is extremely small, and a running system with a small tape running load is realized, and the running system It is possible to realize a compact VTR that occupies a small area.

Embodiment An embodiment of the magnetic tape device of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the essential parts of a VTR according to an embodiment of the present invention. Supply reels 22 arranged side by side in a tape cassette 21 placed parallel to the first plane in FIG.
A magnetic tape 24 is wound around the take-up reel 23. In the state before the magnetic tape 24 is pulled out from the tape cassette 21, the supply side roller post 25 ', the second rotation guide post 29', and the third rotation guide post 31 'are provided in the opening 37 provided in the front surface of the tape cassette 21. The roll-up roller post 35 'is located. By moving these guide posts by a known tape pull-out means (not shown), a tape running system as shown in FIG. 1 is formed. That is, the supply side roller host 25 'is arranged in parallel with the first plane as shown in FIG.
Rotate to position 25. Second rotating guide post 2
9'goes out of the opening 37 and gradually rises (upward in the vertical direction of the paper)
While moving, it moves to the position shown in FIG. Both the third rotation guide post 31 'and the take-up side roller post 35' move parallel to the first plane, and are respectively numbered 31 and 31 in FIG.
Move to position 35. Reference numeral 40 designates a pinch roller, which is arranged so as to be positioned in the tape running system after being pulled out from the tape cassette 21 so as to descend from the direction perpendicular to the top of FIG. Here, the constituent elements of the running system will be described according to the movement of the magnetic tape 24 from the supply reel 22 to the take-up reel 23 in the state of FIG. The magnetic tape 24, which has come out of the tape cassette 21 in a direction parallel to the first plane from the supply reel 22, is wound around and guided by the roller post 25 on the supply side and wound around the erasing head 26. The magnetic tape 24 is twisted by being wound around the inclined post 27, and the magnetic tape 24 is inclined from the state in which the traveling direction is parallel to the first plane to the direction perpendicular to the first plane and upward in the plane of the drawing. The running direction is parallel to the plane. Then, it goes to the first rotation guide post 28 that is provided perpendicularly to the second plane. More specifically, the line of intersection 38, shown by the alternate long and short dash line in FIG.
The inclined post 27 is installed in the vicinity, and the angle θ formed by the magnetic tape 24 entering and leaving the inclined post 27 and the intersection line 38 is equal, and this angle θ is set at the position of the first rotation guide post 28. Become. And then the second rotating guide post
The magnetic tape 24 guided by 29 is helically wound around the rotary head cylinder 30. As is well known, the rotary head cylinder 30 is provided with a lead (not shown) for guiding the lower end of the magnetic tape 24. The rotary head cylinder 30 is moved by an angle equal to the lead angle of this lead, as shown by an arrow 38 in FIG. By tilting the rotary head cylinder 30 at a predetermined angle, the magnetic tape 24 wound around the rotary head cylinder 30 at a predetermined angle becomes parallel to the first plane and the traveling direction, and at the same time, the rotary head cylinder 30 is tilted (that is, the arrow in FIG. 1). (38 directions) and the traveling directions are parallel to each other and exit from the rotary head cylinder 30. Then, a third rotation guide post 31 provided perpendicularly to the first plane
After that, the running direction is directed toward the tape cassette 21, and the rear winding reel 23 is attached to the audio erasing head 32 and the audio recording / reproducing head 33 and wound around the winding side roller post 35.
To be wound up. Reference numeral 34 denotes a capstan, which has a known structure for driving the magnetic tape 24 at a constant speed in cooperation with the pinch roller 40.

Here, the specifications of the rotary head cylinder 30 are as follows: outer diameter = φ62, lead angle = 5.935 °, tape winding angle = 190 °, tilt direction angle =
Table 1 shows the specifications of each guide member at 256.5 °.
The angle of the tilt direction is 0 ° with reference to the direction from the center of the supply reel 22 toward the take-up reel 23, and the counterclockwise direction is +. The tilt angle is 0 ° with reference to the line perpendicular to the first plane.

With the above-described structure, only one tiny post is inevitably required for the traveling system, and the wrap angle around the post 27 can be made extremely small. In the conventional M traveling system shown in FIG. 2, when the diameter of the rotary head cylinder and the tape winding angle are matched with those of the embodiment of the present invention, the winding angle around the first and second inclined posts 7 and 9 is about 120 °. Also becomes. On the other hand, in Examples of the present invention, as shown in Table 1, 26.7
The running load of this fixed inclined post is about 1.5 times as large as that of the embodiment of the present invention in the M running system if the coefficient of friction with the magnetic tape is 0.25. This ratio increases as the friction coefficient increases, and the traveling system according to the present invention becomes advantageous.

EFFECTS OF THE INVENTION As described above, according to the present invention, a tape cassette including a pair of tape reels arranged in parallel in parallel to a first plane and having a magnetic tape wound therein, and the magnetic tape provided outside the tape cassette, are provided. One of the tape cassette, a rotary head cylinder for recording and reproducing signals by winding a predetermined angle, a tape pull-out means for pulling out the magnetic tape from the tape cassette and winding the magnetic tape around the rotary head cylinder in a substantially M-shape. Tilted post that twists the magnetic tape whose running direction is parallel to the first plane from the tape reel, and a magnetic tape that is twisted by the tilted post between the tilted post and the rotary head cylinder. The first rotation guide post provided perpendicular to the second plane parallel to the traveling direction of the The magnetic tape is wound around the rotary head cylinder through a second rotary guide post at a predetermined angle to tilt the cylinder so that the traveling direction of the magnetic tape is parallel to the first plane, and And a third rotation guide post provided perpendicularly to the first plane for changing the running direction of the magnetic tape parallel to the plane to the direction of the tape cassette.
By using a cassette in which reels are juxtaposed to each other, the tape can be helically wound around the rotary head cylinder to minimize the number of tilt posts required for recording and reproducing signals, and the first rotary guide post can be used. It can be installed and the angle of wrapping around the inclined post can be reduced. Therefore, the winding angle around the fixed guide member, which substantially determines the running load of the tape running system, can be minimized to significantly reduce the running load. For this reason, it is possible to realize high-speed running with the tape wound around the rotary head cylinder with a light load and without damaging the tape. More or less M
Since it is a V-shaped traveling type, it is not necessary to dispose a guide member or a tape on the rear side of the rotary head cylinder, and the tape occupies a small space in the traveling system as in the conventional M traveling system, which is suitable for downsizing of the VTR.

[Brief description of drawings]

FIG. 1 is a plan view of the essential parts of a magnetic tape device according to an embodiment of the present invention, and FIG. 2 is a plan view of the essential parts of a conventional magnetic tape device. 21 …… tape cassette, 22 …… supply reel, 23 …… take-up reel, 24 …… tape, 27 …… tilt post, 28 …… first
Rotating guide post, 29 …… second rotating guide post,
30 …… Rotating head cylinder, 31 …… Third rotating guide post.

Claims (1)

[Claims] 1. A tape cassette having a pair of tape reels arranged side by side on a first plane and having a magnetic tape wound therein, and a signal recording / reproducing by winding the magnetic tape outside the tape cassette at a predetermined angle. And a tape pull-out means for pulling out the magnetic tape from the tape cassette and winding the magnetic tape around the rotary head cylinder in a substantially M-shape. Slanting post for twisting the magnetic tape, which is parallel to the flat surface of the magnetic tape, and a second plane between the slanting post and the rotary head cylinder and parallel to the running direction of the magnetic tape twisted by the slanting post. The first rotation guide post and the second rotation guide post that are provided perpendicularly to the By winding the magnetic tape around the rotary head cylinder at a predetermined angle to tilt the cylinder so that the running direction of the magnetic tape is parallel to the first plane, and the running direction of the magnetic tape parallel to the first plane. And a third rotation guide post that is provided perpendicularly to the first plane to change the direction of the tape cassette to the direction of the tape cassette.