JPH061585B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a tape guide system for guiding a magnetic tape in a tape cassette to a rotating cylinder.

[Background of the Invention]

Generally, in a magnetic recording / reproducing apparatus for recording / reproducing a signal using a tape cassette, at the time of recording / reproducing, a magnetic tape is pulled out from the tape cassette and loaded into a predetermined tape running path around a rotating cylinder, and recording / reproducing is performed. At the end, a magnetic tape loading mechanism is used to retract the magnetic tape from the tape running path and store it in the tape cassette. In such a magnetic recording / reproducing apparatus, the mechanism occupies a very large proportion in terms of size and weight reduction, and the entire size of the mechanism is substantially determined by the formation state of the tape running system of the magnetic tape.

Therefore, various tape running systems have been developed so far for the purpose of reducing the size and weight of the entire apparatus.
As described in Japanese Patent Laid-Open No. 5-160362, the magnetic tape in the tape cassette is guided obliquely to the entry side of the rotary cylinder by the tape guide, and the magnetic tape in the tape cassette is guided by the other tape guide. It is proposed that the guides are guided in parallel to the exit side. In this conventional example, the space above the tape cassette when the lid provided to the tape cassette is opened when the cassette is mounted can be used as the tape loading space.
This is very effective for thinning the entire device, but since the magnetic tape on the entry side is guided so as to wrap around behind the rotary cylinder, a space for tape loading is required behind the rotary cylinder. Therefore, there is a problem that the reduction of the depth direction of the device is hindered, and the tape running path on the entry side rises more than the plane of the chassis, so that there is a limit to the thinning of the device. Further, in order to form the tape running path on the entry side so that the magnetic tape from the tape cassette to the winding start point of the rotary cylinder does not come into contact with the rotary cylinder, a plurality of auxiliary guides are required. The guide not only complicates the mechanism itself, but also needs to control the posture of each auxiliary guide so that undesired tension is not applied to the magnetic tape, which causes a problem that the mechanism for that complicates. .

[Object of the Invention]

An object of the present invention is to provide a magnetic recording / reproducing apparatus which eliminates the above-mentioned drawbacks of the prior art and realizes an extremely compact tape running path, which enables reduction in size and weight of the entire apparatus.

[Outline of Invention]

In the mechanism of the magnetic recording / reproducing apparatus, since the rotary cylinder is attached so as to be inclined with respect to the chassis, the height relationship of the entire apparatus is greatly affected by this inclined state.
Furthermore, the inclination of the rotary cylinder and the height of the tape running system and the tape cassette have a close relationship. In consideration of these, the present invention provides a first tape guide group that obliquely guides the magnetic tape in the tape cassette to the entry side of the rotary cylinder, and also provides a starting point at which the magnetic tape is wound around the rotary cylinder and its start point. It is characterized in that it is inclined by a predetermined angle in a direction substantially in the middle of the center point of the winding.

Example of Invention

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

1 and 2 are plan views of a tape loading mechanism of a magnetic recording / reproducing apparatus according to the present invention, FIG. 3 is a side view of the state of FIG. 2 seen from the tape entrance side, and FIG. 2 shows the loading completion state.

In these figures, 1 is a substrate, 2 is a rotary cylinder on which a magnetic head (not shown) is mounted, 3 is a tape cassette, and inside the tape cassette 3, a supply reel 4 on which both ends of a magnetic tape 6 are wound. And the winding side reel 5 are built in,
The magnetic tape 6 is stretched by the pins 7a and 7b in the tape cassette 3 as shown by a broken line in FIG.
Further, 8a and 8b are guide rollers, 9a is an inlet side inclined guide, and 9b is an outlet side inclined guide.
a and the inlet side inclined guide 9a are planted in a guide base described later in a predetermined positional relationship.
b and the outlet side guide roller 9b are also planted in another guide base described later in a predetermined positional relationship. Reference numeral 10 is a tension pin for detecting the tension of the magnetic tape 6 during running,
The tension pin 10 is erected on a tension arm described later. Reference numeral 11 is an opening formed in the front and lower sides of the tape cassette 3, and 12 is a lid of the tape cassette 3 that opens and closes the opening 11.
When the device is mounted on the device, the lid 12 is opened to insert the guide rollers 8a and 8b, the inlet side inclined guide 9a, the outlet side inclined guide 9b, and the tension pin 10 into the opening 11. It has become. Further, 13 is a fixed guide that regulates the running height of the magnetic tape 6 pulled out from the tape cassette 3, 14 is an inclined guide implanted in the substrate 1, 15 is a full width erasing head, 16 is an impedance roller, and 17 is an A / C head, 18 is a capstan, and 19 is a pinch roller.

When the magnetic tape 6 is in the unloading state as shown by the broken line, the guide rollers 8a and 8b, the inlet side inclined guide 9a, the outlet side inclined guide 9b, the tension pin 1
0 is at the position shown by the broken line in the figure. When loading the magnetic tape 6 from such an unloading state, first, the tension pin 10 moves along the path (a) shown by the broken line in the figure and is held at a predetermined position near the tilt guide 14. . That is, the supply side reel 4
The magnetic tape 6 supplied from the tape cassette 3 passes through the pin 7a in the tape cassette 3 and is wound in a state substantially parallel to the fixed guide 13 and the tension pin 10 on the apparatus side, and is positioned near the inclined guide 14 (first position). See figure).

On the other hand, the guide roller 8a and the inlet side inclined guide 9a integrally move along the route (b), and the guide roller 8b and the outlet side inclined guide 9b integrally move along the route (c). 8a and the inlet side inclined guide 9a are arranged so as not to reach the position of the magnetic tape 6 until the magnetic tape 6 is positioned in the state shown by the solid line in FIG. Then, when the magnetic tape 6 is positioned in the vicinity of the inclined guide 14, the guide roller 8a and the entrance side inclined guide 9a move while moving upward while catching the magnetic tape 6 with respect to the substrate 1. In this way, the guide roller 8
When the "a" and the inlet side inclined guide 9a move along the path of (b) while moving upward, the magnetic tape 6 gradually winds around the inclined guide 14 and the rotary cylinder 2 in the ascending process, and is directed upward by the inclined guide 14. Is slidably contacted with the full-width erasing head 15 and the impedance roller 16 and then guided to the guide roller 8a and the inlet side inclined guide 9a to reach the rotary cylinder 2.

Further, the magnetic tape 6 which has come out of the rotary cylinder 2 has its running posture adjusted to a plane parallel to the tape cassette 3 by the guide roller 8b moving along the route (b) and the outlet side inclined guide 9b. The magnetic tape 6 is taken up by the take-up reel 5 via the A / C head 17, the capstan 18, the pinch roller 19, and the pin 7b in the tape cassette 3, and the loading operation of the magnetic tape 6 is completed (see FIG. 2). When the magnetic tape 6 is running, the pinch roller 19 is pressed against the capstan 18 as shown by the broken line (d) in FIG. 2, and in this state the capstan 18 is driven by a motor (not shown).
The magnetic tape 6 is transported by being rotated by the driving force from the magnetic tape 6.

On the other hand, when the magnetic tape 6 is unloaded, the loading mechanism performs an operation that is the reverse of the above-described operation at the time of loading.

Next, the winding operation of the magnetic tape 6 on the rotary cylinder 2 will be described in more detail with reference to FIGS. 4 and 5.

4 and 5 are bottom views of a part of the tape loading mechanism shown in FIG. 1 as seen from the back surface of the substrate 1. In FIG. 4, the magnetic tape 6 is unloaded as shown by the broken line in FIG. FIG. 5 shows the magnetic tape 6 in the middle of loading as shown by the solid line in FIG. In these figures, 20 is a rotating body having a cam groove 36,
The rotating body 20 is supported by a shaft 23 planted in the substrate 1 and is rotatable. A gear 21 is formed on the outer circumference of the rotating body 20, and the gear 21 meshes with a worm gear 22 held by both bearings 24 a and 24 b mounted on the substrate 1. 28 is a motor in which a pulley 27 is directly connected to its output shaft. The pulley 27 is connected to a pulley 25 directly connected to one end of the worm gear 22 via a belt 26. The rotational force of the motor 28 is the pulley 27,
It is transmitted to the rotating body 20 via the belt 26, the pulley 25, and the worm gear 22.

Reference numeral 29 denotes an arm rotatably supported by the shaft 23. The arm 29 is urged in the counterclockwise direction in the figure by the force of a spring (not shown) to rotate integrally with the rotating body 20. There is. An arm 31 is rotatably connected to the arm 29 via a pin 30, a arm 33 is rotatably connected to the arm 31 via a pin 32, and a guide base 35 is rotatably connected to the arm 33 via a pin 34. The guide base 35 is equipped with the guide roller 8a and the inlet side inclined guide 9a described above.

Reference numeral 38 denotes a slider having an elongated hole 38a, a pin 37 implanted at one end of the slider 38 is engaged with the cam groove 36, and a U-shaped portion 38 is provided at the other end of the slider 38.
b is formed. The elongated holes 38a are engaged with pins 39a and 39b planted in the substrate 1, respectively, and the slider 38 is guided by these pins 39a and 39b and slidable in the left-right direction in the drawing.

40 is a tension arm, and the tension arm 4
0 is rotatably supported by a shaft 41 planted in the substrate 1, and is urged by a spring 43 in the arrow (e) direction (clockwise direction). This tension arm 4
The tension pin 10 described above is planted at one end of 0, and the pin 42 is planted at the other end.
2 is engaged with the U-shaped portion 38b of the slider 38.

Although not shown, the gear 21 of the rotary body 20 is meshed with another rotary body. This rotating body is the rotating body 20.
When the other rotating body rotates in the opposite direction to the rotating body 20 in conjunction with the rotation of the guide roller 8, the guide roller 8 described above is rotated.
The guide base on which the b and the outlet side inclined guide 9b are mounted is integrally rotated via a plurality of arms. Therefore, the rotation of the motor 28 causes the rotor 2 to rotate.
When 0 rotates, other rotating bodies (not shown) also rotate in the opposite direction to the rotating body 20, and the rotation of these rotating bodies causes the guide base 35 having the guide roller 8a and the inlet side inclined guide 9a to be mounted in the direction shown in FIG. The guide roller 8b and the other guide base (not shown) mounted with the outlet side inclined guide 9b move along the route (b) of FIG. 1 and move along the route (c) of FIG.

The operation of the above configuration will be described below for the tape entrance side.

In the unloading state shown in FIG. 4, the guide roller 8a mounted on the guide base 35, the inlet side inclined guide 9b (neither is shown), and the tension arm 4 are provided.
The tension pin 10 implanted at 0 is at the position shown by the broken line in FIG. When the motor 28 is energized in this state,
The rotating body 20 rotates counterclockwise in the figure by the rotation of the motor 28, and the slider 38 moves leftward in the figure due to the engagement between the cam groove 36 and the pin 37. When the slider 38 moves to the left, the U-shaped portion 38b and the pin 4
The engagement with the tension arm 40 causes the shaft 4 to move.
The magnetic tape 6 is pulled out from the tape cassette 3 by the tension pin 10 embedded in the tension arm 40. The guide base 35 connected to the arm 29 via the other arms 31 and 33 by rotating the rotating body 20 and the arm 29 integrally in the counterclockwise direction,
It moves in the direction of the rotary cylinder 2 along the guide groove 44 provided on the substrate (see FIG. 5). Here, the guide base 3
The positions of the guide roller 8a and the inlet side inclined guide 9a mounted on the arm 5 are set so as not to reach the position of the magnetic tape 6 stretched by the tension pin 10.
The lengths of 31 and 33 are set.

When the rotating body 20 further rotates in the counterclockwise direction from this state, the pin 37 engages with the equal-diameter portion of the cam groove 36, so that the position of the tension arm 40 remains the same and the guide base 35 pulls the magnetic tape 6. Shown while hanging
The tape moves upward along the path (b) with respect to the substrate 1 to finally form the tape running path shown in FIGS. 2 and 3. In the ascending process, the magnetic tape 6 is gradually wound around each of the tilt guide 14 and the rotary cylinder 2, and the magnetic tape winding state in the front loading process wound around the tilt guide 14 gradually becomes upward, and accordingly, the magnetic tape is wound up. Since the guide base 35 is a path for ascending, during the ascending process, between the guide roller 8a and the inlet side inclined guide 9a on the guide base 35 and the apparatus side inclined guide 14, and the guide roller 8a and the inlet side. It is less likely that an unnatural and unreasonable force is applied to the magnetic tape 6 stretched between the tilt guide 9a and the rotary cylinder 2. Further, the final tape running path shown in FIG. 2 and the tape running path during the loading process do not cause a large deviation in the attitude and position of the magnetic tape 6, and thereby prevent the magnetic tape 6 from being damaged. be able to.

Although not shown on the tape outlet side, as described above, when the rotating body 20 rotates, the guide roller 8b and the outlet side inclined guide mounted on the guide base (not shown) accordingly. 9b moves along the path (c) in FIG. 2 to form a predetermined tape running path. Further, the loading length of the guide roller 8b and the outlet side inclined guide 9b, that is, the tape outlet side loading length, and the above-described loading length of the guide roller 8a and the inlet side inclined guide 9a, that is, the tape inlet side loading length are almost the same. The lengths of the arms and the gear ratios of the two rotating bodies are set so that they are equal.

Next, the relationship between the inclination of the rotary cylinder 2 and the tape running path will be described with reference to FIGS. 3 and 6 to 10.

FIG. 6 shows the tilt angle of the rotary cylinder 2 and the lid 12 of the tape cassette 3 with the tilt direction of the rotary cylinder 2 as a parameter.
FIG. 7 shows the relationship with the height position h _c of the upper end of the rotary cylinder 2 in the vicinity, and FIGS. 7 to 10 described below including FIG. 6 are magnetic tapes on the outlet side of the rotary cylinder 2. There is a condition that 6 is guided to the same height as the magnetic tape 6 in the tape cassette 3, that is, parallel to the magnetic tape 6 by the outlet side inclined guide 9b. The tilt direction A of the rotary cylinder 2 is substantially the direction of the winding start point of the magnetic tape 6 around the rotary cylinder 2, which is the direction generally adopted in the conventional VHS system, and the tilt direction C
Is the direction of the substantially central point between the winding start point and the winding end point of the magnetic tape 6 around the rotary cylinder 2, and the inclination direction B is a direction approximately midway between these A direction and C direction. This is the direction used in the present embodiment (see FIG. 2), and the height h ₁ of the lid 12 of the tape cassette 3 is the height when the lid 12 is opened, and the minimum value is usually It is inevitably defined for loading the magnetic tape 6.

From FIG. 6, when the rotary cylinder 2 is tilted in the B direction as in this embodiment, the steepest gradient is obtained.
It can be seen that the height h _c can be effectively reduced by a small change in the inclination angle of. The tilt direction and tilt angle of the rotary cylinder 2 of the tape traveling system that is generally adopted in the conventional VHS direction are points indicated by a in the figure, and this point a
The height _{h l} height _{h c} of the rotary cylinder 2 the lid 12 in
Since it is located at a higher position, the rotary cylinder 2 cannot be inserted (overlapped) below the lid 12, which hinders the reduction of the depth dimension of the device.
Therefore, in order to make the rotary cylinder 2 slip under the lid 12 in the conventional method, it is necessary to increase the inclination angle of the rotary cylinder 2 to a point indicated by a ′ in the figure. To increase the height,
This hinders the thinning of the device. On the other hand, in the inclination direction B adopted in this embodiment, the point a of the conventional method is
Smaller inclination angle, for example h at the point indicated by b in the figure
Since it with _{c <h l,} without increasing the rotary cylinder 2 overall height, it is possible to submerge a portion of the rotary cylinder 2 to the lower lid 12 of the tape cassette 3.

FIG. 7 shows the relationship between the tilt angle of the rotary cylinder 2 and the maximum height h _cm of the rotary cylinder 2, and FIG. 8 shows the relationship between the tilt angle of the rotary cylinder 2 and the height h _g of the tape path on the entry side. Also, these also use the tilt direction of the rotary cylinder 2 as a parameter. From FIG. 7, h _cm increases in the order of A → B → C with respect to an arbitrary tilt angle of the rotary cylinder 2, and the maximum height of the rotary cylinder 2 with respect to the tilt angle of the rotary cylinder 2 with B as a boundary condition. It can be seen that the changing tendency of the reverse direction is reversed. On the other hand, as shown in FIG. 8, the height h _{g of the} tape path on the entry side is A → B as the tilt angle of the rotary cylinder 2 increases.
→ It increases in the order of C, but it can be seen that the degree of influence is steeper than that shown in FIG. 7.

By the way, the maximum height in the tape running system is the maximum height h _cm of the rotating cylinder 2 and the height h _{g of the} approach side tape path.
Is determined by the larger value of. Therefore, the above 7th
9 and FIG. 8 are combined, and FIG. 9 shows the horizontal axis representing the tilt angle of the rotary cylinder 2 and the vertical axis representing the larger value of h _cm and h _g . From FIG. 9, at the point of b in this embodiment, h _cm and h _g have almost the same value, and at the point b, the increase of the maximum height is suppressed to a minute amount Δh as compared with the point a of the conventional method. At the same time, it can be seen that the inclination angle of the rotary cylinder 2 can be reduced by Δθ. Therefore, according to the above FIGS. 7 to 9, when the rotary cylinder 2 is tilted in the B direction as in this embodiment, the maximum height in the tape running system, that is, the maximum height h of the rotary cylinder 2 is obtained.
_It can be seen that the inclination angle of the rotary cylinder 2 can be reduced by Δθ by slightly increasing the height _{cm in cm} or the height h _g of the approach-side tape path as compared with the conventional method. The inclination direction of the rotary cylinder is 0.35 when the inclination direction A (starting point of winding tape on the rotating cylinder) is zero and the inclination direction B (intermediate point of winding tape on the rotating cylinder) is 1. It is good to set it within the range of 0.7.

On the other hand, FIG. 10 shows the relationship between the lower end h _b of the rotary cylinder 2 and the inclination angle of the rotary cylinder 2. When the point is moved from a to b by the amount corresponding to Δθ in FIG. The height h _b of the lower end of is reduced by Δh ′,
This Δh 'is greater than Δh'> Δh described above.
It can be seen that it is.

Therefore, from FIGS. 6 to 10 described above, in the present embodiment, the height above the substrate 1 is slightly increased by Δh as compared with the conventional method, but the height below the substrate 1 is increased by Δh. Can be decreased by Δh 'which is larger than the increase of. Moreover, since a part of the rotary cylinder 2 can be pushed under the lid 12 of the tape cassette 3, the height and depth of the entire mechanism can be reduced, and the device can be made compact.

〔The invention's effect〕

As described above, according to the present invention, the loading operation for winding the magnetic tape around the rotary cylinder is performed with the loading length on the entry side to the rotation cylinder and the loading side on the exit side from the rotation cylinder being substantially the same. The inclination angle of the tape can be reduced and the rotary cylinder can be overlapped below the tape cassette lid. Further, the guide member that constitutes the tape running system including the rotary cylinder can be compactly integrated in the minimum necessary volume. Therefore, a compact and lightweight magnetic recording / reproducing apparatus can be provided.

[Brief description of drawings]

1 and 2 are plan views showing a tape loading mechanism of a magnetic recording / reproducing apparatus according to the present invention, FIG. 3 is a side view of the state of FIG. 2 seen from the tape entrance side, FIGS. 4 and 5. 1 is a bottom view of a part of the tape loading mechanism shown in FIG. 1 viewed from the back side of the substrate, FIG. 6 is an explanatory view showing the relationship between the inclination angle of the rotary cylinder and the height of the upper end of the rotary cylinder, and FIG. FIG. 8 is an explanatory view showing the relationship between the inclination angle of the cylinder and the maximum height of the rotating cylinder, FIG. 8 is an explanatory view showing the relationship between the inclination angle of the rotating cylinder and the height of the tape path on the entrance side to the rotating cylinder, and FIG. FIG. 10 is an explanatory view showing the relationship between the inclination angle of the cylinder and the maximum height of the rotating cylinder and the maximum value of the tape path height, and FIG. 10 is an explanatory view showing the relationship between the inclination angle of the rotating cylinder and the lower end of the rotating cylinder. . 1 ... Substrate, 2 ... Rotating cylinder, 3 ... Tape cassette, 4 ... Supply reel, 5 ... Take-up reel, 6 ...
Magnetic tape, 8a, 8b ... Guide roller, 9a ... Inlet side inclined guide, 9b ... Outlet side inclined guide, 10 ...
Tension pin, 12 ... Lid, 14 ... Inclination guide.

Claims (2)

[Claims] 1. A rotary cylinder having a magnetic head mounted thereon, and a magnetic tape wound around a reel in a tape cassette is pulled out from the tape cassette and wound around the rotary cylinder at a predetermined angle to form a predetermined tape running path. In a magnetic recording / reproducing apparatus comprising a tape guide group and a drive means for driving the tape guide group, a first tape which guides the magnetic tape in the tape cassette obliquely to the entrance side of the magnetic head of the rotary cylinder. Set up a guide group,
A magnetic recording / reproducing apparatus, wherein the rotating cylinder is inclined by a predetermined angle in a substantially intermediate direction between a winding start point of the magnetic tape and a center point of the winding. 2. A second tape guide group for guiding the magnetic tape is provided on the exit side of the magnetic head of the rotary cylinder, and the moving distances of the first tape guide group and the second tape guide group are substantially equal to each other. The magnetic recording / reproducing apparatus according to claim 1, wherein