JPH0378151A - Tape guiding mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To adjust the posture of a tape on a cylinder and the distribution of tape tension and to miniaturize the device by changing the tilt direction, the tilt angle and the position of non-rotation type guide posts on a proceeding side and a receding side. CONSTITUTION:A tape drawing-out guide mechanism where the 1st non-rotation type guide post 4 is oriented is constituted so that a tape 3 which is laid to be stretched between the 1st non-rotation type guide post 4 and the cylinder 1 may travel in a state where it is twisted. The winding angle of the tape to rotation type guide posts 5 and 13 is made large, and a tape traveling direction is changed mainly by the guide posts 5 and 13. Therefore, the winding angle of the tape 3 to the non-rotaion type guide posts 4, 6, 12 and 14 is kept small and the tape tension on a tape path is suppressed. Thus, the device is miniaturized and the high performance thereof is accomplished.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a so-called helical scan type device in which a magnetic tape is spirally wound at a predetermined angle around a cylinder equipped with a one-rotation magnetic head to record and reproduce signals. The present invention relates to a tape guide mechanism of a magnetic recording/reproducing device, and particularly relates to a configuration of a tape guide mechanism that can simultaneously reduce the size and improve the performance of a magnetic recording/reproducing device.

[Conventional technology]

In the so-called parallel loading method, the tape is pulled out from the cassette in parallel by a group of tape pull-out guides on both the tape entry and exit sides of the cylinder, and the tape is wound around the cylinder at a predetermined angle. For example, by reducing the diameter of the cylinder and making the tape 27mm
VH8-compact cassette that can be wound over 0” (
In the VH8-C) system, since the cylinder is inclined by about 40 degrees, the height occupied by the cylinder becomes large, and the overall size of the apparatus cannot be reduced.

To deal with this, it is necessary to place the cylinder upright or nearly upright with respect to the chassis. In this case, the tape pull-out guide disposed near the tape entry side with respect to the cylinder raises and pulls out the tape from the cassette diagonally so as to separate it from the chassis. The tape pull-out guide located in the cassette uses a three-dimensional loading method that lowers the tape diagonally to bring it closer to the chassis.

Here, the tape pull-out guide generally has a configuration in which a rotating guide post and a fixed cylindrical guide post (non-rotating guide post) are arranged on a guide base. For example, as a tape pull-out guide placed nearby,
There are two types: one in which non-rotating guide posts are arranged as disclosed in Japanese Patent Application No. 453, and the other in which rotating guide posts are arranged as disclosed in Japanese Patent Application Laid-Open No. 64-3846.

[Problem to be solved by the invention] When a non-rotating guide post is placed closest to the cylinder, the tape's sliding resistance increases because the wrapping angle of the tape around the non-rotating guide post is several tens of degrees or more. becomes large, leading to an increase in tape tension. As a result, thin tapes are easily damaged when running, and the capstan motor requires large torque due to the increased tension on the running path from the cylinder exit to the capstan. Miniaturization of motors has been hindered.

In addition, since the recording and reproducing performance of signals by a rotating magnetic head is greatly influenced by the posture of the tape on the cylinder and the tension distribution in the width direction of the tape, the tape enters the cylinder in order to optimize the posture and tension distribution of the tape. It is necessary to set the inclination direction, inclination angle, and position of the guide post around which the tape is wound immediately before or after exiting to an appropriate state. When placing a rotating guide post closest to the cylinder, the tape must be wrapped vertically around the rotating guide post, so the inclination direction and angle of the rotating guide post cannot be adjusted. Since it is difficult to set the posture and tension distribution to the optimum state, there are problems such as difficulty in ensuring the flat touch performance of the rotating magnetic head.

On the other hand, when a rotating guide post is disposed closest to the cylinder, the influence of uneven rotation of the roller portion of the rotating guide post is directly transmitted to the cylinder portion, which tends to cause deterioration such as jitter.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention includes a rotary guide post on a base of a tape pull-out guide member disposed near one or both of the tape entry side and the tape exit side of the cylinder, and a rotary guide post for the cylinder. a first non-rotating guide post disposed closest to the cylinder; and a second non-rotating guide post disposed farther from the cylinder than the first non-rotating guide post; On the tape entry side of the cylinder, the tape is wound in the order of the second non-rotating guide post, the rotating guide post, and the first non-rotating guide post, and then enters the cylinder, and the tape enters the cylinder on the tape exit side of the cylinder. In the tape pull-out guide disposed at , the magnetic tape emitted from the cylinder is wound around the first non-rotating guide post, the rotating guide post, and the second non-rotating guide post in the order of travel. The tape pull-out guide mechanism was configured as follows.

Then, the first non-rotating guide post of the tape pull-out guide mechanism of the first means is moved so that the tape stretched between the first non-rotating guide post and the cylinder runs in a twisted state. A tape pull-out guide mechanism was constructed in which a non-rotating guide post was oriented.

[Effect]

With the above configuration, the tape wrapping around the rotating guide post has a large corner, and the tape running direction can be mainly changed by the rotating guide post, so that the tape wrapping around the non-rotating guide post can be It is possible to keep the corners small when wrapping, and tape tension on the tape path can be suppressed. As a result, damage to the thin tape can be prevented, the load torque of the capstan motor is reduced, and the capstan motor can be made smaller. It is possible to achieve a tape condition in which the lower side in the width direction of the tape is stretched, and the upper side of the tape is stretched on the cylinder exit side, making it possible to obtain a good head touch. It becomes difficult to transmit to the cylinder.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state in which loading has been completed by a magnetic recording/reproducing apparatus using the tape pull-out guide mechanism of the present invention.A cylinder 1 is placed on a chassis 100.
Cassette 2. It is equipped with a group of guide bosses, etc. Cylinder 1 is upright. Non-rotating guide post 41 rotating guide post 5. The non-rotating guide post 6 is mounted on the entrance guide base 7, and the non-rotating guide post 12. The rotating guide post 13 and the non-rotating guide post 14 are mounted on an exit guide base 15.

After the tape 3 leaves the supply reel 2a in the cassette 2,
Tension post 11, guide post 10. After wrapping around the non-rotating inclined post 9 and the impedance roller 28,
It wraps around the non-rotating guide post 6, the rotating guide post 5, and the non-rotating guide post 4 in this order, and enters onto the cylinder 1. Here, in order to reduce the running resistance of the tape 3, the non-rotating guide post 4 is wound so that the angle thereof is about 10 degrees. After the tape 3 wrapped around the cylinder 1 exits the cylinder 1, the non-rotating guide post 1
2. Rotating guide post 13, non-rotating guide post 1
4, and then passes through the guide post 16, 17, the erasing head 18, the control signal head 19, and the guide post 20, 21, and reaches the pinch roller 22, where it is held between the pinch roller 22 and the capstan 23 and driven. Then, it returns to the take-up reel 2b in the cassette 2. Here, in order to reduce the running resistance of the tape 3, the non-rotating guide post 12 is also wound so that the angle thereof is approximately 10 degrees.

Next, the loading operation of loading the tape 3 onto the cylinder 1 will be explained. Before loading starts, the guide base 7 carrying the non-rotating guide post 6, the rotating guide post 5, and the non-rotating guide post 4 is located inside the cassette opening, and their positions are shown with dashes and dashed lines. . When loading starts, a non-rotating guide post 6, a rotating guide post 5, mounted on a guide base 7,
The non-rotating guide post 4 moves in the direction of arrow A along the outer periphery of the cylinder 1 while gradually pulling the tape 3 upward from the cassette 2 to the chassis 100, and presses and holds the tape 3 against a positioning member (not shown). Tape 3
Wrap around cylinder 1 at a predetermined angle. Similarly, on the exit side, before loading starts, the guide base 15 on which the non-rotating guide post 12, the rotating guide post 13, and the non-rotating guide post 14 are mounted is inside the cassette opening, and the position is indicated by a dash. Indicated by a dashed line. When loading starts, the non-rotating guide post 13, the rotating guide post 14, and the non-rotating guide post 15 mounted on the guide base 15 gradually move the tape 3 downward with respect to the chassis 100 while pulling out the tape 3 from the cassette 2. While pulling out the tape 3, it moves along the outer periphery of the cylinder 1 in the direction of the arrow, and is held under pressure by a positioning member (not shown) to wrap the tape 3 around the cylinder 1 at a predetermined angle.

FIG. 2 is a side view of FIG. 1 viewed from the direction of arrow A. A non-rotating guide post 4, a rotating guide post 5, and a non-rotating guide post 6, which are drawer guides on the tape entry side, lift the tape 3 from the cassette 2 obliquely so as to separate it from the chassis 100 and pull it out. . A non-rotating guide post 12°, a rotating guide post 13, and a non-rotating guide post 14, which are drawer guides on the tape exit side, move the tape 3 from the cassette 2 to the chassis 10o.
It is pulled out by lowering it diagonally so that it approaches the .

Figure 3 shows the side surface of cylinder 1 on the tape entry side in Figure 1.
- It is a figure seen from the direction of a'. The tape 3 is wrapped around the non-rotating guide post 4 and then wrapped around the cylinder 1 in the direction of arrow C. The lower side of the tape 3 is set to be stretched near the upper entry point. - The dotted chain line shows the state of the non-rotating guide post 4 when the geometrical conditions for preventing the tape 3 from twisting are satisfied. Figure 4 shows cylinder 1 in Figure 1.
FIG. 3 is a view of the side surface of the tape exit side viewed from the direction bb'. After the tape 3 is wrapped around the cylinder 1 in the direction of arrow 2, it is wrapped around the non-rotating guide post 12. The non-rotating guide post 12 is set so that the tape 3 is twisted between the cylinder and the non-rotating guide post 12 so that one side of the table 3 is stretched near the exit point on the cylinder 1. - The dash-dot line shows the state of the non-rotating guide post 4 when the geometrical conditions for preventing the tape 3 from twisting are satisfied. By twisting the tape 3 in this way, the tape 3 on the cylinder 1 has a large tension on the lower side of the tape near the entry point, and a large tension on the upper side of the tape near the exit point. This creates a tension distribution state that is good for securing a flat touch in the track area near the lower end.

〔Effect of the invention〕

In the device using the invention described above, the non-rotating guide post 4
By changing the inclination direction, inclination angle, and position of the non-rotating guide post 12, the tape posture and tape tension distribution on the cylinder 1 can be adjusted.

In addition, since the non-rotating guide post 4 and the non-rotating guide boss 12 can only be wrapped around 10 degrees at most, even though the non-rotating guide has greater sliding resistance than the rotating guide, the non-rotating guide There is almost no increase in tape tension due to the guide post 4 and non-rotating guide post 12. As a result, damage to the thin tape can be prevented, and the capstan torque for running the tape can be small, which is effective in downsizing the capstan motor.

Furthermore, since the tape 3 is wrapped around the non-rotating guide post 4 immediately before entering the cylinder, uneven rotation of the rotating guide post 5 is not easily transmitted to the cylinder, and similarly, the tape 3 is wrapped around the non-rotating guide post 12 immediately after leaving the cylinder 1. Since the guide post 13 is wrapped around the guide post 13, uneven rotation of the rotary guide post 13 is not easily transmitted to the cylinder 1. As a result, jitter deterioration due to uneven rotation of the cylinder 1 is suppressed.

That is, the present invention solves the problems of the guide mechanism used in the conventional three-dimensional loading system, so that the cylinder can be placed upright or nearly upright with respect to the chassis.

As a result, the size of the magnetic recording/reproducing device can be reduced.

Therefore, according to the present invention, it is possible to simultaneously reduce the size and improve the performance of a magnetic recording/reproducing device.

[Brief explanation of drawings]

1 is a top view showing a state in which loading is completed in a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1 viewed from the direction of arrow A, and FIG. 3 is a cylinder 1 , a side view of the tape 3 and the non-rotating guide post 4 seen from the direction a-a' in FIG. It is a side view seen from the direction b'. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Cassette, 2a... Supply reel, 2b... Take-up reel, 3... Tape, 4
... First non-rotating guide post on the approach side, 5... Rotating guide post on the approach side, 6... Second non-rotating guide post on the approach side, 7... Guide base on the approach side, 8... - Impedance roller, 9... Non-rotating guide post, 10... Guide post, 11... Tension post, 12... First non-rotating guide post on exit side, 13
... Exiting side rotating guide post, 14... Exiting side second non-rotating guide post, 15... Exiting side guide base, 16.17... Guide post, 18... Erasing head, 19 ...Control signal head, 20.21
...Guide post, 22...Pinch roller, 23.
... Capstan, 100... Chassis. A: N ratio 8st Id base P sharp sea size

Claims (1)

[Claims] 1. When the magnetic tape (3) pulled out from the cassette (2) is at least completely loaded into the cylinder (1) equipped with a rotating magnetic head, the cylinder (1) is equipped with a rotating magnetic head. ) in a tape pull-out guide mechanism for a magnetic recording and reproducing device, comprising a tape guide member positioned and disposed at one or both of the tape entry side, tape exit side, and both sides of the tape entry side, (7, 15); a rotating guide post (5, 13) comprising a fixed shaft fixed to the guide base member (7, 15) and a rotating roller fitted into the fixed shaft; It is fixed on the guide base member (7, 15) adjacent to the rotary guide post (5, 13), and at least when the magnetic tape (3) is completely loaded, the cylinder (1) a first fixed cylindrical guide post (4, 12) disposed closest to the outer peripheral surface;
The first fixed cylindrical guide post (4, 12) is fixed adjacent to the first fixed cylindrical guide post (4, 12), at least when the magnetic tape (3) is completely loaded. The above cylinder (1)
a second fixed cylindrical guide post (6, 14) disposed at a position spaced from the magnetic tape (3) on the tape entry side of the cylinder (1); is wound around the second fixed cylindrical guide post (6), the rotating guide post (5), the first fixed guide post (4), and the cylinder (1) in this order. or the above cylinder (1)
On the tape entry side, the magnetic tape (3) is connected to the cylinder (1), the first fixed cylindrical guide post (12), the rotating guide post (13), and the second fixed guide post. A tape guide mechanism for a magnetic recording/reproducing device, comprising a guide member arranged to be wound in the order of a cylindrical guide post (14). 2. The first fixed cylindrical guide post (4, 12) is connected to the cylinder (1) when the magnetic tape (3) is completely loaded. 4, 12), near the point of entry into the cylinder (1),
The tape is twisted so that the tension on the lower side in the tape width direction increases, and the tape is oriented so that it runs in a twisted state so that the tension on the upper side in the tape width direction increases near the exit point from the cylinder (1). 2. A tape guide mechanism for a magnetic recording and reproducing apparatus according to claim 1, which has a configuration as follows. 3. The first fixed cylindrical guide post (4, 12)
is configured such that the angle at which the magnetic tape (3) is wound is smaller than that of the second fixed cylindrical guide post (6, 14) when the magnetic tape (3) is completely loaded. A tape guide mechanism for a magnetic recording/reproducing device according to claim 1 or 2. 4. At least the guide base (7, 15), the rotating guide post (5, 13), the first fixed cylindrical guide post (4, 12), and the second fixed cylindrical guide post ( 6, 14) means the cassette (2) along the outer periphery of the cylinder (1).
4. The tape guide mechanism for a magnetic recording/reproducing apparatus according to claim 1, wherein the tape guide mechanism is configured to be moved between a first position at the side and a second position at the loading completion state.