JPS6117257A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute smoothly tape loading by inclining a guide drum in the direction vertical to the detaching direction of a magnetic tape, and also raising the magnetic tape to an approach position of the guide drum from the horizontal running position by using plural inclined posts. CONSTITUTION:When a guide drum 11 is inclined in the detaching direction of a magnetic tape 9, as for the part wound in the direction opposite to the running direction extending over 180 deg. from a detached position B of the magnetic tape 9 wound spirally around the guide drum 11, its relative height to a substrate becomes roughly constant, and becomes a tape path roughly parallel to the substrate surface. In this case, by using plural inclined posts, first of all, a comparatively large torsion is given to the magnetic tape 9, and subsequently, a stepwise tape path for determining the running direction is formed. In this way, as for a variation of the tape running direction, the winding angle is made small by a small loading path, and smooth tape loading can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device in which a magnetic tape is wrapped once around a helical scan guide drum over a range of 180 degrees or more, and is particularly designed to be made smaller and thinner. The present invention relates to a magnetic recording/reproducing device.

Current technology since 1. In order to make household video tape recorders (hereinafter referred to as VTRs) more compact and capable of recording multiple recordings, a loading method (for example, 8 mm video tape) has been proposed in which a magnetic tape is wound around a guide drum over a range of more than 180 degrees.

Conventionally, there have been two main types of loading methods for winding a magnetic tape around a guide drum approximately 180 degrees: parallel loading and U loading.

As shown in FIGS. 3(A) and 3(B), the parallel loading 1 involves loading the magnetic tape 4 (in the figure) against a guide drum 3 which is attached to the substrate 2 at an inclination angle α1 in the direction of the arrow S1 in the figure. Guide posts 5a, 5b and inclined posts 6a, 6 are arranged symmetrically on the entry side and exit side of the vehicle (traveling in the direction of the arrow).
b.

In addition, as shown in FIGS. 4(A) and 4(B), the U loading 7 moves the guide drum 3 at an angle α2(
γ=α2), and the magnetic tape 4 is tilted at either the entrance side or the exit side from the guide drum 3 (
For example, the detachable side) is detached from the substrate 2 in a horizontal direction. In this loading method, the magnetic tape 4
The angle of approach of the guide drum 3 into the guide drum 3 is approximately twice the lead angle γ with respect to the substrate 2, and the guide roller 8 for drawing out is located at a considerably high position.

Problems to be Solved by the Invention However, in the above-mentioned parallel loading 1, the winding angle λ1 of the magnetic tape 4 on the guide drum 3 is set to a large value (1
80 degrees or more), the inclination angle α of the guide drum 3 increases.
The winding angle θ of the magnetic tape 4 on both the magnetic tape 1 and the inclined posts 5a and 5b increases.

Therefore, in parallel loading 1, when the winding angle of the magnetic tape 4 is increased, the inclination angle α1 of the guide drum 3 becomes large, so the height of the guide drum 3 relative to the substrate 2 (indicated by arrow H1 in the figure) becomes large, and the magnetic recording There was a drawback that the playback device could not be made thinner.Also, the tilted post 5
Since the winding angle θ of the magnetic tape 4 at points a, 5b is approximately the same, a large frictional force is generated between the magnetic tape 4 and the inclined posts 6a and 6b, increasing the tape running load and hindering the stable running of the magnetic tape 4. It has the disadvantage of being exposed.

In addition, when the winding angle λ2 of the magnetic tape 4 on the guide drum 3 is increased (180 degrees or more) in the U loading 7, the guide roller 8 must be provided at a position farther from the guide drum 3, and the The drawback is that the area required for loading is large, making it impossible to downsize. In addition, as a result, the height of the guide roller 8 relative to the substrate 2 (indicated by H2 in the figure) becomes large, and there is a drawback that it is impossible to reduce the thickness. Furthermore, since the height position of the magnetic tape when it is pulled out from the tape cassette (not shown) with respect to the substrate 2 and the height position at which the magnetic tape 4 enters the guide drum 3 are significantly different, the difference in height is Magnetic tape 4
Therefore, the running path of the magnetic tape 4 becomes long, and therefore a large area is required for loading the magnetic tape 4, which also has the drawback of hindering miniaturization.

Therefore, in the present invention, the magnetic tape, which has been raised in stages by a plurality of first inclined posts, enters the guide drum which is inclined in a direction perpendicular to the direction in which the magnetic tape is removed from the entry position. Magnetic recording employs a loading method in which the magnetic tape is wound around the guide drum twice over 180 degrees or more, by having a configuration in which the magnetic tape is guided to a horizontal running position by a second inclined post and then removed. An object of the present invention is to provide a magnetic recording and reproducing device that can be made smaller and thinner.

Means for Solving the Problems In order to solve the above problems, the apparatus of the present invention uses the following means. As shown in FIGS. 1A and 1B, a guide drum 11 is placed on a substrate 10 vertically holding a reel stand (not shown in FIG. 1) on which a magnetic tape 9 is wound. It is provided so as to be inclined in a direction perpendicular to the direction of separation (direction indicated by arrow S3 in the figure).

Further, a plurality (for example, two) of first inclined posts 12, 13 are provided near the entrance position of the magnetic tape 9 (indicated by symbol A in the figure) on the outer periphery of the guide drum 11.

Further, a second inclined post 14 is provided near the detached position of the magnetic tape 9 on the outer periphery of the guide drum 11 (indicated by symbol B in the figure).

Therefore, the magnetic tape 9 is guided from the horizontal running position by the plurality of first inclined posts 12, 13, moves upward to the entry position A of the guide drum 11, and is guided by the second inclined post 14 to the horizontal running position.

By tilting the guide drum 1'1 with respect to the direction in which the magnetic tape 9 is removed, the magnetic tape 9 wound spirally around the guide drum 11 is moved 18 from the removal position B.
The part that is wound in the opposite direction to the running direction over 0 degrees (the part from symbol B to symbol C in Fig. 1) has a substantially constant relative height with respect to the substrate 10, and is approximately parallel to the substrate surface. This results in a tape pass.

Generally, when changing the running direction of a magnetic tape using a tilted post, it is known that if the twist angle of the magnetic tape is small relative to the angle at which the running direction is changed, the wrapping angle around the tilted post will be large. There is. Furthermore, when the wrapping angle becomes large, a large amount of friction occurs between the inclined post and the magnetic tape, which impedes smooth tape loading. In other words, a smaller wrapping angle is preferable for tape loading, but 1. A large twist angle requires a large tape loading path to remove the twist angle.

Therefore, by using a plurality of inclined posts, first a relatively large twist is given to the magnetic tape 9, and then a stepwise tape path is established to determine the running direction, so that changes in the tape running direction can be avoided by winding the tape with a small loading path. Smooth tape loading can be achieved with small corners.

Embodiment FIGS. 1(A) and 1(B) show an embodiment of the magnetic recording/reproducing apparatus according to the present invention. In FIG. 1, reference numeral 11 is a guide drum attached to a substrate 10 that vertically holds a reel stand (not shown in FIG. 1) for supplying and taking up one winding of the magnetic tape 9. (221 degrees according to the 8 mm video standard). In addition, magnetic tape 9
The vehicle travels in the direction indicated by the arrow in the figure.

The guide drum 11 is inclined in a direction perpendicular to the direction in which the magnetic tape 9 is removed from the guide drum 11 (in the direction indicated by arrow S3 in the figure), and the guide drum 11 is inclined with respect to one substrate 10.
The side with the smaller height dimension of 1 is the entrance side of the magnetic tape 9,
The side with the larger height dimension is defined as the detachment side of the magnetic tape 9. Note that the inclination angle α3 of the guide drum 11 is selected to be approximately 1.5 times the lead angle.

At the outer peripheral position of the guide drum 11, near the position where the magnetic tape 9 enters the guide drum 11, there are a guide boss 16 and a guide roller 15, which regulate the vertical running position of the magnetic tape 9 when it is attached, and a plurality of guide rollers ( For example two) first inclined posts 12.13 are provided. Further, a second inclined post 14 and a guide post 17 are provided at the outer periphery of the guide drum for separating the magnetic tape.

The magnetic tape 9 is mounted on a reel stand (
(not shown in FIG. 1), is loaded while maintaining a height position approximately equal to the horizontal traveling position when pulled out, passes through the guide post 16, reaches the inclined post 12, and is sequentially stepped by the inclined post 12.13. The robot is raised to the approach position A.

First, the magnetic tape 9 is given a small inclination and a relatively large twist diagonally upward by the inclined post 12. Next, the magnetic tape 4 is made to have a predetermined inclination angle (approach angle to the guide drum 11) by the inclined post 13, and the inclined post 13
Remove the twist caused by.

As described above, by first giving a relatively large twist to the magnetic tape 9 with the inclined post 12, the wrapping angle between the magnetic tee 19 and each of the inclined posts 12 and 13 can be made small. The frictional force generated is small, allowing smooth tape loading. In addition, the next tilted post 13 removes the twist imparted to the magnetic tape 9 by the tilted post 12, and sets the traveling direction of the magnetic tape 9 to a predetermined tilt angle (the angle of approach to the guide drum 11). There is no twist in the tape loading after the inclined post 13 (twisting occurs only in the portion sandwiched between both inclined posts 12 and 13), and the magnetic tape 9 can enter the guide drum 11 in good condition. can.

The magnetic tape 9 seated on the inclined post 12, 13 and moved upward is reversed in its running direction by the guide roller 15, enters the guide drum 11 from the entry position A, and is wound around the guide drum 11 in a spiral shape. .

The guide drum 11 is inclined at an angle approximately 1.5 times the lead angle (7.5 degrees according to the 8 mm video standard) in a direction perpendicular to the direction in which the magnetic tape 9 is removed. By selecting this angle of inclination and direction of inclination, as shown in Fig. 1 (A>
In the magnetic tape 9 wound around the middle guide drum 11, the relative height to the substrate 10 is approximately constant in a range of approximately 180 degrees from the detachment position B to the symbol C position, and the magnetic tape 9 is approximately parallel to the substrate surface. It becomes a tape pass.

Therefore, the magnetic tape 9 is moved from the horizontal running position to the guide drum 1.
In order to guide the magnetic tape 9 to the approach position 1, in FIG. It is only necessary to raise the valve by a dimension that is the sum of the rising dimension of the magnetic tape 9 up to that point. The winding portion of the magnetic tape 9 that directly contributes to determining this rising dimension is
As mentioned above, it is a small section from the symbol C position to the guide roller 15, so the rising dimension is a small value, and the guide roller 8 is at a low position, and according to the 8 mm video standard, it is a small section.
It can be provided at a position 3.4 mm higher than the height of position C in A) and near the guide drum 11.

In addition, the inclined posts 12 and 13 and the guide roller 15 only need to move the magnetic tape 9 upward by a small rising distance, so the distance between each post can be shortened, and the arrangement from the inclined post 12 to the guide roller 15 can be The distance can be made small. Therefore, the inclined post 12. ．． 13 and guide roller 1
5 can be arranged very close to the outer periphery of the guide drum 11.

The magnetic tape 9 is magnetically recorded and reproduced while being wound around the guide drum 11, and is removed from the guide drum 11 at a removal position B. The magnetic tape 9 detached from the guide drum 11 is guided by the inclined post 14 to a horizontal running position, and the running direction is changed by the guide post 17 and runs on the reel stand on the winding side (as shown in FIG. 1). (not shown).

At this time, the magnetic tape 9 is placed in a horizontal running position by one inclined post 14, but at the detached position B, the guide drum 11
The direction of inclination of the magnetic tape 9 and the direction of separation of the magnetic tape 9 are orthogonal to each other.
The winding angle of the magnetic tape 9 around the inclined post 14 is the smallest, so that the generated frictional force is small and smooth tape loading is performed.

Here, FIG. 2 shows the mounting state of the device of the present invention.

In the figure, a cassette half 18 has reel stands 19a and 19b for supplying and winding the magnetic tape 9.

On the entrance side of the magnetic tape 9 along the outer circumference of the guide tram 11, an impedance roller 20, an erase head 21, a guide post 22, 23, a tension regulator 24, etc. are installed in the tape loading path between the cassette half 18 and the guide post 16. It is arranged. Also, a control head 25. is located on the tape loading path between the cassette half 18 of the magnetic tape 9 and the guide post 17. Capstan 26. Pinch roller 27° guide post 28
etc. are arranged.

The guide roller 15, the inclined posts 12, 13, and the guide post 16 are attached to an annular loading ring 29 provided on the outer periphery of the guide drum 11. This loading ring 29 corresponds to the loading ring 29 on the substrate 10. The guide rollers 15, inclined posts 12, 13, and guide posts 16 rotate on guide rails (not shown) provided as follows.
The magnetic tape 9 is loaded by moving around the outer circumference.

As mentioned above, the guide roller 15 and the inclined post 12.1
Since the spacing between the loading rings 3 and 3 is short, the loading ring 29 can be made small. Furthermore, when the loading ring 29 is in the unloading position, the guide roller 15, the inclined posts 12, 13, and the guide post 16 can be housed in the cassette half 18 without changing their arrangement intervals.

Effects of the Invention As described above, according to the magnetic recording and reproducing apparatus of the present invention, the guide drum is tilted in a direction perpendicular to the direction in which the magnetic tape leaves the magnetic tape, and the magnetic tape is moved from the horizontal running position to the entering position of the guide drum in multiple directions. Even if the magnetic tape is wound around the guide drum over a range of 180 degrees or more by raising it using an inclined post, approximately 180
The winding angle of the magnetic tape, which directly contributes to raising the magnetic tape to the guide drum entry position, is approximately parallel to the substrate surface, and the relative height position with respect to the substrate remains unchanged. Therefore, the rise to the magnetic tape entry position is relatively small, and the guide roller can be installed at a low position near the guide drum, reducing the height required for tape loading. The magnetic recording and reproducing device can be made thinner, and since the entry position is at a low position, the spacing between the inclined posts and guide rollers that move the magnetic tape upward to the entry position can be reduced. Therefore, the respective inclined posts and guide rollers can be provided at positions extremely close to one outer periphery of the guide drum, so that the tape loading path becomes a short path along the outer periphery of the guide drum, thereby downsizing the magnetic recording/reproducing device. Furthermore, since the magnetic tape is moved up in stages by multiple inclined posts, a large twist can be imparted to the magnetic tape within a short tape loading path, thus reducing the wrapping angle of the magnetic tape at each inclined post. This has the advantage that the frictional force due to the attachment of the inclined post and the magnetic tape at a small angle is small and the tape can run smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a magnetic recording/reproducing device according to the present invention, FIG. 2 is a schematic configuration diagram showing an example of a mounting state of the device of the present invention, and FIG. 3 is a diagram for explaining parallel loading. 4 is a schematic diagram for explaining U loading. 2.10... Board, 3.11... Guide drum, 4
゜9...Magnetic tape, 6a, 6b, 12.13.14
... Inclined post, 8.11 ... Guide roller, 19a
. 19b...Reel stand, 29...Loading ring. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A substrate that vertically holds a reel stand of a magnetic tape, a guide drum provided on the substrate and inclined in a direction perpendicular to the direction in which the magnetic tape is removed, and a guide drum for the magnetic tape located at an outer peripheral position of the guide drum. A plurality of first inclined posts provided near the entry position of the magnetic tape, and a second inclined post provided near the separation position of the magnetic tape from the guide drum, The first inclined post raises the magnetic tape step by step from the horizontal running position and guides the magnetic tape to the entry position, and the second inclined post guides the magnetic tape to the horizontal running position and runs it. A magnetic recording/reproducing device characterized by: