JPH02165456A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To reduce the traveling load of a tape when it is traveled in a normal direction and to prevent the tape from being loosened by making the tape winding angle of a guide post just behind the tape outlet side of a rotating head drum smaller than the tape winding angle of a guide post just before the tape inlet side. CONSTITUTION:When the positions of the respective guide posts 3a, 3b, 4a and 4b on movable guide posts on the tape side and the tape side of the rotating head drum 2 are set, the tape winding angle to the auxiliary inclination guide post 4b on the tape outlet side is made smaller than that to the auxiliary inclination guide post 3b on the tape inlet side. Therefore, the tension of the tape on the tape supplying side becomes smaller than that on the tape inlet side and the traveling load of a capstan is reduced. Thus, the traveling load of the tape T in the normal direction is reduced and simultaneously, the tape T is made difficult to be loosened when it is traveled in a reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording or reproducing apparatus that draws out a tape from a cassette and winds it around a head drum to form a predetermined tape running path.

(Prior Art) Conventionally, in video tape recorders (hereinafter referred to as VTRs) and the like, a tape is pulled out from a cassette and wound around a head drum to form a predetermined tape running path for recording.
A tape loading mechanism is employed that enables various operations including playback.

There are various types of tape loading mechanisms depending on the tape recording format and the design of the tape running path.

Figure 6 shows a conventionally commonly used example, 8 mm.
FIG. 3 is a plan view showing an example of a tape running path of a VTR.

In the figure, a magnetic tape (hereinafter referred to as tape) T pulled out from a supply reel Rs in a cassette C loaded in a predetermined cassette mounting portion on a chassis 100 is connected to a tension post 101, a guide roller 102, a rotary head drum A predetermined tape is placed on the chassis 100 via the entry side main inclined post 103, the rotating guide roller 104 for reducing the wrapping angle of the main inclined post 103, the tape height regulating guide roller 105, and the drum entry side auxiliary inclined post 106. It is supplied to the rotary head drum 107, which is rotatably disposed at an inclined angle (approximately 3 degrees inclining toward the cassette), and is wound around it by approximately 290 degrees. The tape pulled out from the rotating head drum 107 is passed through the rotating head drum exit side auxiliary inclined post 108, the guide roller 109 for height regulation, the rotating guide roller 110 for reducing the wrapping angle of the main inclined post 111 (described later), and the drum exit side. The cassette C is wound onto the infield take-up reel Rt via the main inclined post 111, capstan 112, pinch roller 113, and guide roller 114.

In addition, in order to make the device more compact, this tape loading device has a rotating head drum with a smaller diameter, and when the tape loading operation is performed, the tape is pulled out from the cassette and the cassette is advanced toward the head drum. The head drum is partially wedged into a recess on the front of the cassette to save space.

(Problems to be Solved by the Invention) However, as the diameter of the head drum becomes smaller as described above, the winding angle of the tape around the head drum inevitably increases, and the tape must be wound around the head drum in a narrow space. , the tape bus, that is, the tape running path becomes complicated.

In addition, in order to minimize the running load of the tape, the angle at which the tape is wrapped around fixed posts with heavy loads is reduced. becomes smaller, 8m
In order to record both the video signal recording area and the PCM audio recording area according to the mVTR format, approximately 330 m of tape must be wound around the rotating head drum (for example, if a 26.7φ rotating head drum is used). However, in this arrangement of guide posts, the height regulating guide posts interfere with each other on the tape entry and exit sides of the head drum.
The arrangement itself is extremely difficult.

Furthermore, as shown in FIG.
When the tape running direction is reversed, such as reverse) or rewind), the capstan is located on the tape supply side, and only the reel is on the tape take-up side, reducing torque. The rigidity of the tape causes it to sag in the vicinity of the head drum, which is subject to a heavy load, causing the tape to bite into the head drum, potentially making it impossible to run the tape in the reverse direction, which poses a major problem in miniaturizing devices. It has become.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and its means include pulling out a tape from a cassette, winding it around a rotating head drum, and moving the tape along a predetermined tape running path. λ, the tape wrapping angle at the tape guide post immediately after the tape exit side of the rotating drum is smaller than the tape wrapping angle at the guide post immediately before the tape input side with respect to the rotating head drum. The purpose is to set the position of each guide post so that the

The tape is also provided with a plurality of guide posts that pull out the tape from the cassette and wrap it around the rotating head drum to form a predetermined tape running path, and the tape is supplied in the direction of supplying the tape to the tape entry side guide post adjacent to the rotating head drum, and the tape is rotated. The tape running path is configured such that the direction in which the tape is pulled out from the tape output side guide post adjacent to the head drum is inclined toward the tape input side with respect to the center line of the tape winding angle with respect to the rotary head drum.

Further, a tape guide means consisting of a height regulating post for regulating the height of the tape and an inclined post for tape winding is provided on the tape entry side and the tape exit side of the rotating head drum. The height regulating post of each of the tape guide means is located closer to the tape than the inclined post for tape winding when viewed from the direction of the center line of the tape winding angle with respect to the rotary head drum. It consists in configuring it so that it will be done.

(Function) As a result, even if the rotating head drum is made smaller in diameter and the tape wrapping angle is increased, when the tape runs in the forward direction,
In addition to being able to reduce the running load, it is possible to form a tape running path without causing the interference between the tape guides mentioned above, and to prevent the occurrence of slack in the tape, thereby preventing running defects caused by this. .

Furthermore, even if the tape momentarily slackens, the amount of wrapping around the auxiliary inclined post on the tape output side is reduced, so that it is smoothly connected to the tangential direction of the head drum, and can be prevented from digging into the tape guide means.

(Example) Hereinafter, the recording or reproducing apparatus according to the present invention is an 8mm VTR.
An embodiment of the present invention will be described in detail with reference to the figures.

FIGS. 1(a), 1(b), and 1(c) respectively show the tape running path in the apparatus of the present invention. FIG. 1(a) shows the tape loading state, FIG. ) is a side view of the tape running path in the tape unloading state, and FIG. 2(c) is a side view of the tape running path seen from the side of the rotary head drum in the tape loading state.

In each figure, 1 is a main chassis, 2 is a rotary head drum rotatably attached to the main chassis 1 via a drum base 5 at a predetermined angle,
High-speed rotation (2700r, p, m) by a motor (not shown)
, ). In addition, in this embodiment, by tilting the head drum by 6 degrees (5 degrees to 7 degrees) approximately perpendicular to the direction of the cassette, it is possible to maximize the amount of penetration of the head drum into the recess on the front surface of the cassette during tape loading. This minimizes the depth and thickness of the entire device.

3 is a tape entry side movable guide post that pulls out the tape T from inside the cassette C during tape loading and wraps it around the rotating head drum 2 from the tape entry side;
a and 3b on a support member 3c, and are moved along a guide groove 5a formed in the drum base 5.

Similarly, reference numeral 4 denotes a tape exit side movable post that pulls out the tape from the cassette C during tape loading and wraps it around the rotating head drum 2 from the tape exit side, and includes a guide post 4a,
4b is provided on a support member 4C, and is moved along a guide groove 5b formed in a drum base 5 disposed on the chassis 1.

Reference numeral 15 denotes a movable inclined guide post that guides the tape pulled out from the tape exit side movable guide post 4 to a capstan, which will be described later.
5a, and is moved in conjunction with the movable guide post 4 on the table exit side.

76 is a tension regulator that keeps the tape tension constant by pressing a tension post against the tape pulled out from the supply reel Rs of the cassette C, 53 is a vertical guide post, 51 is a guide roller 52 is an impedance roller, and 40 is a tape tension regulator. Capstan to be transferred, 7
0 is a pinch roller supported by a pinch roller lever 68, 73a is a pinch roller supported by a lever 73, and a capstan 40 is supported by a lever 73.
This guide post introduces the tape exiting the cassette C to the take-up reel Rt in the cassette C.

Although the details will be described later, the cassette C is mounted and held on a movable chassis 60 that is arranged on the main chassis 1 so as to be able to slide back and forth with respect to the head drum 2. It is configured to take a retracted position and move forward with the tape loading operation.

In addition, the lever 73 to which the tension regulator 76, pinch roller lever 68, and guide post 73a are attached is
It is placed on a movable chassis 60 on which the cassette is placed.

Next, the tape loading operation will be explained. In the tape unloading state shown in FIG. 1(b), the cassette C is retracted from the head drum by the movable chassis 60 and is in a position where it can be attached or detached by known means.

In this state, the cassette C is separated from the head drum 2, and the movable guide posts 3, 4, and 15 on the tape entry and exit sides of the main chassis l, and the movable chassis 60
The upper tension post 76a, guide post 73a, and pinch roller 70 are all located inside the tape in the recess C1 on the front surface of the cassette C.

In this state, when a tape loading operation is performed by the tape loading mechanism described later, the movable guide posts 3.4 on the tape entry side and the tape exit side move to the outside of the cassette according to the guides 45a and 5b, respectively.
The tape is pulled out from inside the cassette and wound around the outer periphery of the head drum 2. At the same time, the movable guide post 15 also moves to the outside of the cassette to form a predetermined tape running path.

Simultaneously with the above-described operation, the movable chassis 60 with the cassette C mounted thereon is moved toward the head drum 2 side. In conjunction with this movement, the tension regulator 76 rotates counterclockwise to move the tension post 76a into the recess C of the cassette C.
1 move outside, and the pinch roller 70 connects the capstan 40.
The guide post 73a is moved to a position close to the cassette where it can be crimped, and the guide post 73a is also rotated to the outside of the cassette by the clockwise rotation of the lever 73.

The above operations lead to the state shown in FIG. 1(a) in which the tape loading operation is completed.

In this tape loading state, the tape pulled out from the supply reel R5 in the cassette C is loaded onto the tension post 76a, the vertical guide post 53, and the inclined guide post 5.
1. It is introduced into the head drum 2 via the impedance roller 52 and the movable guide post 3 on the drum entry side, and is approximately 33
It is wound 0 degree (in this embodiment, a small diameter one with a diameter of 26.7φ is used as the rotating head drum), and is passed through the drum exit side movable guide post 4, movable guide post 15, capstan 40, and guide post 73a. It is wound onto a winding loop Rt in a cassette C.

Now, regarding the tape running path in the tape loading state shown in FIG. 1(a), we will explain in more detail with reference to FIG. It is guided by the next inclined guide post 51 and tilted at the angle necessary to introduce it into the rotary head drum 2. In other words, the inclined guide post 51 is a so-called drum entry side main inclined post that converts the tape running path into a horizontal plane and a predetermined inclined plane, and sets the inclination angle of the tape introduced into the rotating head drum in the tape running path. be. The guide roller 3a of the movable guide post 3 is a guide roller for regulating the height of the tape, and the inclined guide post 3b of the movable guide post 3 is a guide roller for regulating the height of the tape.
is an auxiliary inclined guide post that changes the inclined surface on which the tape runs in order to change the tape running plane to the optimum introduction angle to the head drum 2.

Regarding the tape exit side of the drum, the tape exiting the head drum 2 is converted by the movable guide post 4 on the drum exit side to the inclined surface of the next stage inclined guide post 15a. That is, the inclined guide post 4b of the movable guide post 4 is an auxiliary inclined post that changes the inclination angle of the tape running surface. After the height of the tape is regulated by a guide roller 4a, the angle of the tape running path is converted to a horizontal plane of the tape in the cassette C by a movable guide post 15a. This movable guide post 15a is a main inclined guide post that converts the tape running surface from an inclined surface to a horizontal surface of the cassette.

In this way, since the tape on the drum exit side is converted to the same plane as the tape in the cassette C in front of the capstan, there is no need to tilt the capstan 40 with respect to the main chassis 1, and the capstan 40 can be arranged vertically. This has the effect of making the tape loading mechanism of the mechanism thinner and facilitating its design. As a result, the head drum 2 can be positioned at the center of the tape in the cassette C (-dotted chain line) as shown in FIG. In addition, the capstan 40 can be arranged perpendicularly to the main chassis without being tilted, which facilitates the design of the mechanism.In addition, each guide component that forms the tape running path can be placed in the cassette. By concentrating on the center line of the tape, it is possible to reduce the vertically protruding parts of the head drum, and the mechanism can be made significantly thinner.

In order to realize the above-described tape running path of the present invention, it is important to set the cross line of the main inclined guide post. The cross line means the line of intersection between the running surface of the tape tilted by a tilt post or the like and the reference plane containing the cassette C. Further, the tape has an equal incident angle and an exit angle with respect to the cross line.

In the present invention, the head drum 2 tape person (
-11 and the cross line of the main inclined guide posts 51, 15a that determine the tape inclination angle on the exit side, respectively. ．． 1
0 is set as shown in FIG. 1(a).

Cross line on the tape entry side 1. The main inclined guide post 51 is set within a range of, for example, 26 to 28 degrees with respect to the straight line lr passing through the centers of both reels of the cassette C.
This makes it possible to arrange the guide posts 52 and 53 in front and behind the main chassis 1 on the main chassis 1. Therefore, compared to the conventional example, it is possible to reduce the number of movable guide blocks that move the rotating guide roller for reducing the winding angle of the main inclined guide post.

On the other hand, the cross line 1° on the tape exit side is, for example, 25 to
The distance from the head drum is set within a range of about 30 degrees and the distance from the head drum is 2.0 to 2.5 times the radius of the head drum.

As a result, the winding angle of the main inclined post 15a can be reduced, and a rotating guide post for reducing the winding angle of the main inclined guide post can be made unnecessary.

Moreover, by setting in this way, the main inclined guide post 15a can be located inside the tape,
By configuring this with movable guide posts, the number of guide posts can be reduced compared to the conventional example shown in FIG. 6, and the space outside the tape running path can also be reduced.

On the other hand, in the conventional example shown in FIG. 6, the cross lines are set as ll' and lo' as shown in the figure, so the tape does not run toward the rotating head drum, and the guide rollers that change the direction are used. are needed in large numbers.

By the way, the setting of the cross lines i,, i, corresponds to the setting of the inclination angle of the head drum 2. That is, the inclination angle of the head drum 2 is set as described above, and the angle of inclination of the head drum 2 is set as shown in FIG.
As mentioned above, the amount of penetration of the head drum 2 into the cassette can be maximized by making the height change at the entrance and exit of the head drum 2 approximately half of the tape. It becomes possible to separate the inclined guide post from the head drum 2, in other words, it is possible to separate the cross line from the head drum.

Therefore, the device can be made smaller, and
It is possible to avoid creating a tape running path that is unreasonable for the tape, such as by inclining the tape at a steep angle, and it is possible to form a stable tape running path without tape damage.

By the way, according to the tape running path of the present invention, as mentioned above, due to the smaller diameter of the head drum, in order to comply with the 8 mm VTR format and maintain compatibility with conventional devices, it is necessary to further arrange the guide posts. We need to devise ways to do this.

In other words, since the head drum 2 has a small diameter and a large winding angle, the inclined guide rollers for regulating the height interfere with the head drum at the tape entrance and exit sides, and the winding angle of 330 degrees is reduced. The resulting configuration cannot be simply set. In addition, if the guide posts on the tape entry and exit sides are arranged symmetrically with respect to the head drum (this will cause problems when the tape runs in reverse during reverse playback, REWIND, etc. The tape running load is large, and when the tape runs in reverse, the drive source for winding the tape becomes the supply reel shaft, and the winding torque decreases, so the tape tension decreases on the capstan side, which is the output side of the head drum 2. There is a tendency to

Therefore, when the tape is fed out in reverse by the capstan, the tape tends to slacken at the portion of the movable guide post 4 that was on the output side of the head drum when the tape is running in reverse at high speed.

If slack occurs, the tape will bulge out to the outside of the guide post, bite into the head drum, or come into contact with the opposing tape, making it impossible for the tape to run smoothly.

In order to solve this problem, the present invention solves the above problem by setting the position of each guide post on the movable guide post 3.4 on the tape input side and tape output side of the head drum, as described below. ing.

FIG. 2 is an enlarged view of the tape running path (indicating the locus of the center of the tape) in the vicinity of the tape inlet and outlet sides of the head drum 2. In the figure, consider a coordinate system in which the center of the tape wrapping around the tape head drum 2 is the y-axis, and the coordinates of the center of the head drum are (0, 0). The contact points of the auxiliary inclined guide posts 3b, 4b and the height regulating guide posts 3a, 4b with respect to the tape are A (a, , ay ) B (b, , by), respectively.
Let C (c++, cy) and D (d,,d,). Then, the coordinate relationships of these points are set so that cll>dxl aIl>bll and 1cx-d++l≦l ax -bx.

That is, the tape winding angle around the tape exit side auxiliary inclined guide post 4b is made smaller than the tape winding angle around the tape entry side auxiliary inclined guide post 3b, and the tape tension on the tape exit side is set in advance to be smaller than that on the tape input side. ing.

By the way, the format of 8mm VTR (accordingly, recording,
During playback, the tape tension is determined to be 10 to 15 g between the auxiliary inclined guide post 3b on the tape entry side and the head drum. Therefore, even if the winding of the tape entry-side inclined post is somewhat large, the characteristics are not affected, and the running load on the capstan is reduced by the smaller amount of winding of the tape exit-side auxiliary inclined guide post 4b.

Further, as described above, when the tape runs in reverse, the tape tension at the height regulating guide roller 4a on the movable guide post 4 on the tape exit side and the auxiliary inclined guide post 4b decreases, and the tape tends to become unstable. For example, when the tension is momentarily released, the tape loosens as shown by the - dotted chain line in Figure 2, bulges outward due to the tape's own rigidity, and comes into contact with the tape between the guide posts 3a and 3b on the tape entry side, and the head However, according to the device of the present invention, the tape wrapping angle of the auxiliary inclined guide post 4b on the tape output side is set smaller than that on the input side, so that the head drum can be caught in the drum. It connects smoothly with the close direction, and prevents the tape from digging into the head drum side. For the same reason, as shown in the figure, it is desirable that the distance between the head drum and the auxiliary inclined post be wider on the tape exit side than on the tape input side.

The tape running path in the present invention has been explained above, but
Next, a specific mechanism for performing the above tape loading operation will be explained.

FIGS. 3(a) and 3(b) are plan views showing the states on the main chassis l and the movable chassis 60, respectively, in the tape loading state, and FIGS. 4(a) and (b) are the main chassis in the tape unloading state. FIG. 1 is a plan view showing the top state of the movable chassis 60, respectively.

In each figure, a rotary head drum 2 is rotatably mounted on a main chassis 1 via a drum base 5, and is rotated at a predetermined speed (2700 r, p, m, in this example) by a motor (not shown). It has become so. Further, the support member 3c of the tape entry side movable guide post 3 and the support member 4C of the tape output side movable guide post 4 are engaged with guide grooves 5a and 5b formed on the drum base 5 on both sides of the head drum 2, respectively. is,
It is designed to move along these guide grooves.

On the main chassis l below the drum base 5,
A loading ring (lower ring) 6 that moves the tape exit side movable guide post 4 along the guide groove 5b, and a loading ring (upper ring) 7 that moves the tape entry side movable guide post 3 along the guide groove 5a are rollers. 8a-8
C, they are rotatably placed one above the other with a predetermined gap between them.

On the loading ring 6, an arc-shaped actuating lever 9 is provided with its long holes 9a, 9a, and pins 6b, 6b on the ring 6, so that it can freely rotate in the direction of rotation of the ring, and a spring l.
It is placed in a state where it is biased counterclockwise with respect to the ring 6 by O. This actuating lever 9 is connected to the supporting member 4C of the tape ejection side movable guide post 4 via a pin 90 at its front end and a rotatable connection lever 11, and when the loading ring 6 rotates, the tape ejection side movable guide Post 4 can be moved. Also, the operating lever 9
A connecting lever 12 is rotatably attached to the rear end bin 9d, and a support member 15 having a movable guide post 15a is attached to the free end of the connecting lever 12 by a bin 15b. The connecting lever 12 is biased counterclockwise by a coil spring 13 disposed around the bin 9d, and its rotation range is restricted by known means.

And in the tape loading state, main chassis 1
The engagement recess 1 in the front part of the support member 15 is inserted into the positioning pin 14 of the machine.
5c is pressed by a spring 13 to regulate its position. Regarding the tape exit side movable guide post 4, after reaching the tape loading completion position, the loading ring 7 is further rotated to charge the spring 10, and the guide post is positioned by its biasing force. It looks like this.

On the other hand, the loading ring 6 is connected by a connecting lever 16 disposed between the bin 8b and the bin 3d on the support member 3C of the tape entry side movable guide post 3, and is movable on the tape entry side by rotation of the loading ring 6. Boss 3 can be moved.

The loading rings 6.7 each have gear parts 6a and 7a formed on their outer peripheries, and gears 18 and 19 that are rotatably disposed on the main chassis 1 via a support plate 17 and mesh with each other.
are interlocked with each other. This support plate 17 is urged toward the loading ring by a spring 20 in order to ensure the meshing state of each gear. As a result, the loading rings 6.7 are always rotated by the same angle in opposite directions.

On the other hand, a four-day motor 21 is attached to the upper left of the main chassis 1 and serves as a drive source for the tape loading operation, and a pinion 21a attached to the rotation shaft of the four-day motor 21 is attached to the upper left of the main chassis 1.
, is transmitted to the mode detection gear 23 via the reduction gear 22, and then to the loading ring 6.7 via the gear 24.25. Therefore, the rotation direction of the loading ring can be controlled by the rotation direction of the motor 21.

The gear 24 is a two-stage stack of gears that mesh with the gear 25 and the mode detection gear 23, and a tooth-missing portion is formed at a predetermined location on the outer periphery of the gear that meshes with the gear 25. According to each mode, an electrode pattern for detecting the rotational position is formed to rotate the mode detection gear 23 without transmitting rotation to the loading ring, and the pattern is detected on the chassis facing the mode detection gear 23. A detector such as a brush or a photosensor is disposed to detect the rotational position of the mode detection gear 23, control the cam W27, and set various operation modes.

A cam disc 27 for controlling various brake mechanisms, tension regulators, etc., which will be described later, is meshed with the mode detection gear 23 via a gear 27b on its outer periphery.
The cam disk 27 is further meshed with a drive gear 30 for driving a movable chassis 60, which will be described later, via a reduction gear 29. Moreover, a movable chassis 6 is mounted on the drive gear 30.
A drive pin 30a is provided which engages with the drive pin 30a.

A cam a27a is formed on the upper surface of the cam disk 27 to control a tension regulator, various brakes, etc., which will be described later, according to various operation modes. A control lever 26 for brake control and a cam follower pin 26a that is always engaged with the cam 27a is rotatably disposed on the rotating shaft of the gear 25. Furthermore, a control lever 26 for controlling the brake is rotatably disposed on the rotating shaft of the cam disk 27. A control lever 32 is disposed at one end of which is formed a cam follower pin 32a that engages within the cam 27a, and rotates about a pin 33 on the chassis in accordance with the rotation of the cam disc 27. The other end of the control lever 32 is connected to the left end of a mode lever 34 which is disposed so as to be slidable to the right through the bins 54a, 54b on the main chassis 1 and the long holes 34a, 34a. It slides left and right depending on the various modes, and controls the brake mechanism, etc.

A pinch roller control lever 35 is rotatably disposed on the right side of the mode lever 34 by a pin 36, and is connected to the right end of the mode lever via a pin 35a at one end. On the pinch roller control lever 35, a cam plate 37, which will be described later, and engagement pins 35c' and 35b for controlling the brakes of the take-up reel stand are formed, respectively.

On the right side of the control lever 35, one end is rotatably attached to a pin 38 on the chassis 1, and a cam groove 37b that constantly engages with an engagement pin 35c of the control lever 35 controls a pinch roller actuation lever to be described later. A cam plate 37 having a cam groove 37a formed therein is arranged.

Further, between the cam plate 37 and the chassis, an engaging portion 48a that can be engaged with the right end portion 34c of the mode lever 34 is provided at one end.
An engaging portion 48 (not shown) at the other end that releases the lock of the cassette holder in the closed state and opens the cassette holder.
An eject lever 48 having a shape b is rotatably disposed by a pin 49 and biased clockwise by an integrally molded spring piece 48C. and mode lever 34
When the cassette holder is rotated counterclockwise by the right movement of the cassette holder, the lock of the cassette holder is released by the engaging portion 48b.

Here, to explain the tape running system before and after the rotary head drum 2, on the chassis 1 on the entrance side of the tape, as mentioned above, the tape main inclined guide post 51,
An impedance roller 52 and a vertical guide post 53 are provided, respectively.

On the chassis l on the tape exit side, there is a capstan 4
0 is rotatably arranged by a capstan motor (not shown).

A gear 41 that rotates together with the capstan is rotatably arranged around the capstan 40, and a gear 42 with a boot
, a belt 43, and a bin 55 on the chassis 1. Rotation is transmitted to a reel drive gear 44 which is rotatable. Also, drive gear 4
A small-diameter gear 45 is disposed coaxially with 4, and an idler gear 47 is disposed in such a manner that it always meshes with the gear 45 by means of a rotating arm 46. A friction member (not shown) is interposed between the rotating arm and the idler gear 47, and is configured to perform a swinging motion according to the rotating direction of the gear 45 to select a reel stand to be rotationally driven.

In the figure, 1a to 1c are guide bins for slidingly guiding a movable chassis 60, which will be described later, and 1d and le are guide levers 73, which will be described later. This is a cutout for controlling the tension regulator 76 according to the position of the movable chassis 60.

Further, 50 is a rack plate that controls the supply reel stand brake lever on the movable chassis 60 according to the movement of the movable chassis 60, which will be described later.

Next, the configuration on the movable chassis 60 will be explained.

The movable chassis 60 slides back and forth with respect to the head drum by engaging the pins 18 to IC on the main chassis 1 and the spindle 38 of the cam plate 37 for controlling the pinch roller, respectively, into the long holes 60a to 60d. It is arranged to be movable, and has a cassette holding means (not shown) that can be opened and closed, so that the cassette can be attached and detached at a position retreating from the rotary head drum.

A supply reel stand unit 61 and a take-up reel stand unit 62 are rotatably arranged on the movable chassis 60, respectively, to engage with and rotate the supply reel and take-up reel of the mounted cassette C. There is.

Between the two reel stands, there is a long hole 60e into which the drive bin 30a of the drive gear 30 on the main chassis 1 that slides the movable chassis 60 back and forth is engaged, and a notch 60f into which the idler gear 47 on the main chassis 1 is inserted. is formed.

At the upper right of the take-up side reel stand unit 62, there is a guide lever 73 with a guide post 73a planted at one end.
4, and an engagement pin 73b that engages with the engagement hole 1d of the main chassis 1 is formed at the other end, and a guide that engages with the engagement pin 73b is formed on the movable chassis 60. Engagement hole 60g that restricts the rotation range of the lever 73
is formed.

Further, on the left side of the guide lever 73, a pinch roller lever 68 having a pinch roller 70 at one end is rotatably supported by a pin 69, and is connected by a spring 72 to an operating lever 71 disposed coaxially. , are attached to rotate together via a spring 72. The engagement pin 71b at one end of the operating lever 71 is connected to the movable chassis 60.
It protrudes above the main chassis through a long hole 60h and is engaged in a cam groove 37a of a cam plate 37 for controlling the pinch roller, and is controlled by the cam groove 37a as the movable chassis 60 moves.

A gear 63 to which a brake lever 65 is frictionally connected is rotatably disposed in the gear portion of the take-up reel unit 62 by a pin 64 in a state in which the gear 63 is always in mesh with the brake lever 65 . When the take-up reel rotates counterclockwise, the rotational force causes the reel to jump into the reel gear and act as if it were to apply a brake. 60i is the stop lever of the brake lever 65.

Further, 66 is a brake control lever for controlling the jumping of the brake lever 65 into the reel stand, and is biased clockwise by an integrally molded spring piece, and the engaging portion 66b protruding downward from the movable chassis is connected to the main chassis. It is controlled by the engagement pin 35b of the upper control lever 35.

On the other hand, there is a tension post 76a on the left side of the movable chassis.
A tension regulator 76 is rotatably provided by a pin 75 and biased counterclockwise by a spring 77. Tension regulator is tension post 76a
The band brake 78 wound around the reel stand is controlled according to the tape tension detected in , so that the tape tension is kept constant.

Further, on the left side of the supply reel stand unit 61, a brake lever 79 is disposed rotatably about a shaft 80, and is connected to an engagement pin 81a on a gear 81 at its free end, which is rotatable about a bin 82. The reel is engaged with and disengaged from the reel stand 61 depending on the rotation direction of the reel. A gear that constantly meshes with the rack plate 50 on the main chassis 1 is frictionally coupled to the gear 81, and the brake lever 79 is engaged with and disengaged from the reel stand 61 by the forward and backward movement of the movable chassis 60.

The brake lever 79 has a rotating piece 83 arranged above it.
It can be engaged with the engaging portion 83a at one end of the holder, and control can also be performed by this. That is, the engaging portion 83a of the rotating piece 83 is
The lever 26 is in an opposing position capable of engaging with the free end of the lever 26 whose rotation is controlled by a cam disc 27, and the cam disc 27 performs brake control of the reel stand as appropriate depending on the operating mode.

A reel lock release lever 84 for releasing the reel lock of the cassette is arranged below the supply reel so as to be rotatable by a shaft 85 and biased clockwise by a spring 86. υm the pin 84b that engages with the piece, and place the other end 84a on the shaft 8 on the movable chassis.
7 is connected to one end of a substantially Y-shaped lever 88 which is rotatable. The other end Ill of the substantially Y-shaped lever 88 is engaged with engagement arms 88a and 88c which face the guide bin 1b on the main chassis so that they can engage with each other at both ends of the guide hole 60b.
Therefore, when the movable chassis 60 moves back and forth, the rotation is controlled by the guide pin 1b on the main chassis, and the reel lock lever 84 is controlled to lock and unlock the reel in the cassette. It is composed of

The lever 89 is rotatably disposed around a shaft 90 and biased counterclockwise by a spring 91, and engages with one end of the Y-shaped lever 88 to bias it clockwise. .

The other end of the lever 89 is connected to a brake section 8 that presses the reel stand from above the band brake 78 and applies the brake gently.
Acts as 9a.

Note that 92 in the figure is a cassette detection switch that detects loading of a cassette.

Further, 93 and 94 are gears that mesh with the idler gear 47 and transmit rotation to the supply reel stand.

The tape loading mechanism of the present invention has the above-mentioned configuration, and its operation will be explained below.

In the tape unloading state shown in FIGS. 3(a) and 3(b), the movable chassis 60 is retracted from the head drum 2 by the drive bin 30a of the drive gear 30, and the state shown in FIGS. As is clear with reference to
This shows the state immediately before the tape loading operation starts after the cassette C is loaded.

On the main chassis 1, the tape entry side,
The exit movable guide posts 3 and 4 are located at the starting ends of the guide grooves 5a and 5b, and together with the movable guide post 15 are located in the recess C1 on the front surface of the cassette.

On the other hand, the cam disk 27 is at a position slightly rotated counterclockwise from the position at which it is fully rotated clockwise, and the cam follower pin 32a of the control lever 32 is located just in front of the minimum diameter portion of the cam groove 27a. Therefore, the mode lever 34 is located just before the rightmost position. In this state, the cam disk 27
When the lever 32 is rotated clockwise, the engagement pin 32a moves to the smallest diameter part of the cam groove 27a, thereby rotating the lever 32 counterclockwise, moving the mode lever 34 to the right, and operating the eject lever 55. do. This unlocks the cassette holder (not shown) and ejects the cassette. This state is shown in FIG. 5(b).

The pinch roller 70 is connected to the engagement pin 71b of the operating lever 71.
is located below the cam d437a of the cam plate 37, so that the pinch roller lever 68 is rotated counterclockwise and housed in the recess C1 of the cassette.

Further, the guide post 73a has a lever 73 that is connected to the bin 73a.
b and is rotated counterclockwise by the guide hole ld on the main chassis, and is housed in the recess C1 of the cassette C.

The brake lever 65 on the take-up side reel stand is the lever 66.
is rotated clockwise away from the engagement pin 35b of the control lever 35, so it is forcibly rotated counterclockwise and maintained in the brake released state. Therefore, even if the reel stand rotates, the brake is not applied.

Looking at the supply reel side, the tension regulator 76 rotates clockwise by positioning its bin 76b downward in the elongated hole le on the main chassis, and positions the tension post 76a in the recess C1 of the cassette C. I'm letting you do it. The band brake is therefore also loosened and inactive.

When the movable chassis 60 is in a backward state, the brake 79 is moved to the reel stand 61 because the gear 81 is rotated clockwise by the rack 50 of the main chassis, and is in a brake applied state.

On the other hand, the guide bin 1b on the main chassis is connected to the movable chassis 6.
Since the Y-shaped bar 88 is rotated clockwise, the reel lock release lever 84 is located at the upper end of the elongated hole 60b of 0 and rotated counterclockwise, and a cassette is loaded. Even so, the reel lock is not released. Further, the lever 89 rotates counterclockwise to bias the figure 7 lever, and presses one end of the lever against the reel stand from above the band brake.

The above state indicates a tape unloading state when a cassette is loaded into the apparatus and immediately before the tape loading operation begins, or immediately before the cassette is ejected.

Next, the tape loading operation will be explained step by step.

When a cassette is loaded into the device, the cassette detection switch 9
When this is detected by 2, a control circuit (not shown) energizes the motor 21 to rotate the mode detection gear 23 clockwise.

The mode detection gear 23 rotates the cam disk 27 and the toothless gear 24 counterclockwise. Further, the rotation of the cam disk 27 is transmitted to the drive gear 30, which serves as a drive source for moving the movable chassis 60 toward the head drum. Further, the rotation of the toothless gear 24 is transmitted to the loading ring 6.7 via the gear 25, and serves as a driving source for tape loading operation.

During the movement from the eject state to the unload state, no driving force is transmitted to the loading ring by the toothless gear 24. When the cam disk 27 has rotated until it reaches the unloading position shown in FIGS. 4(a) and 4(b),
The partially toothed gear 24 and the gear 25 mesh with each other, and the loading rings 6.7 start rotating in opposite directions, and the movable guide posts 3, 4. The tape is moved along the guide grooves 5a and 5b, and the movable guide post 15 is also moved in conjunction with the movable guide post 4.
The bow is pulled out from the inside and wrapped around the head drum 2 (330 degrees).

On the other hand, the rotation of the cam disk 27 is reduced by the gear 29, causing the drive gear 30 to rotate counterclockwise.

The rotation of the drive gear 30 moves the movable chassis 60 forward toward the head drum 2 with the drive bin 30a.

As the movable chassis 60 moves forward, the pinch roller lever 6
8, the engagement pin 71b of the operating lever 71 is connected to the cam groove 37 of the cam plate 37 for controlling the pinch roller on the main chassis 1 side.
By moving upward when looking inside a, it rotates clockwise and moves the pinch roller 70 to a position close to and facing the capstan 40.

Further, the guide post 73a is rotated clockwise by the lever 73 moving upward in the elongated hole 1d on the main chassis l, and is moved outward from the inside of the cassette.

Further, as the movable chassis 60 moves forward, the lever 66 is pushed down by the control lever 35, the brake lever 65 becomes free, and thereafter the braking state is controlled by the direction of rotation of the take-up reel 62. That is, by rotating counterclockwise, the reel is automatically applied to the reel stand. By the way, this brake works via a friction clutch, and is more like a back tension than a brake. t+lI wholesale.

In addition, the tension legierator 76 also has its engagement pin 76
b is moved upward in the elongated hole 1e on the main chassis l, thereby being rotated counterclockwise, moving the tension post 76a to the outside of the cassette, and reaching the operating position.

Furthermore, since the gear 81 rotates counterclockwise due to forward sliding of the movable chassis 60, the brake lever 7
9 is rotated in a direction away from the reel stand. Therefore, the supply reel stand is not pre-kissed, and the tape can be smoothly pulled out during tape loading.

When the movable chassis 60 starts moving forward, the guide bin lb
moves downward in the elongated hole 60b on the movable chassis as seen in the figure, the figure 7 lever 88 becomes free, the reel lock release lever 84 rotates clockwise, and its engagement pin 8
4b releases the lock in the cassette.

Further, the lever 89 is rotated clockwise with the rotation of the figure 7 lever 88, and one end thereof is separated from the reel stand 61.

The above tape loading operation results in the tape loading state shown in FIGS. 1 and 3. The characteristics of the tape running path formed thereby are as described above.

In this tape loading state, due to the overstroke of the loading ring, the movable guide post 4 is pressed against the positioning portion at the end of the guide groove 5b by the spring 10, allowing accurate positioning.

This tape unloading state is a stop mode in which tape loading is completed. In this state, the tooth-missing gear 24 has its tooth-missing portion facing the gear 25, and is in a state where no rotation is transmitted. Therefore, after tape loading is finished, the cam disk 27 is rotated without moving the loading ring 6.7, and the cam 27 is rotated.
a controls the mode lever 34, and the control lever 35
The pinch roller is controlled via the brake and the cam plate 37 which controls the pinch roller.

FIG. 5(a) shows the relationship between the cam disk 27 and the mode lever 34 in the recording or reproducing state.

Further, FIG. 5(b) shows the relationship between the cam disc 27 and the mode lever 34 at the time of ejection.

In FIG. 5(a), the cam disk 27 is further rotated counterclockwise from the tape loading state shown in FIGS. 3(a) and 3(b), and the mode lever
moves to the leftmost position, and the control lever 35 and cam plate 37
The pinch roller actuating lever 71 is controlled to press the pinch roller 70 against the capstan 40.

Moreover, as mentioned above, FIG. 5(b) is similar to FIG. 3(a), '
In the tape unloading state shown in (b),
This shows an eject state in which the mode lever 34 is moved to the rightmost position and the eject lever 55 can be operated.

Furthermore, the settings of each of the above-mentioned operation modes can be set using the mode detection gear 23.
This is done by detecting the position of the cam disk 27 and controlling it.

Note that the tape unloading operation can be performed in the reverse order of the above-mentioned operation (the explanation thereof will be omitted).

As described above, the present invention enables thinning of the rotating head drum when the diameter of the rotating head drum is reduced due to miniaturization of the device, even if the winding angle inevitably increases. The number is reduced, the configuration is simplified, and a more stable tape running path without tape damage is realized.

Although this embodiment has been described for the case where it is applied to an 8mm VTR, it is not limited to this, and can be applied to any device where the tape winding angle tends to increase as the head drum becomes smaller. can do.

(Effects of the Invention) As described above, according to the recording or reproducing apparatus of the present invention, by optimizing the positional relationship of the tape guide post in the vicinity of the rotating head drum, the running load of the tape in the forward direction can be reduced. In addition, when the tape runs in reverse, it prevents sagging due to changes in tape tension (and even if sag occurs due to a decrease in tape tension, it is quickly removed to prevent accidents such as tape entanglement). , extremely stable tape running characteristics can be obtained.

Furthermore, due to the reduction in the diameter of the head drum that accompanies the miniaturization of the device, the tape winding angle around the head drum becomes thicker (even if this becomes large, it is possible to realize a thinner and smaller device without deteriorating the tape running characteristics.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are a plan view and a side view, respectively, for explaining the tape running path in the recording or reproducing apparatus of the present invention, and FIG. 1(a) shows the tape loading state. Plan view, Figure (b) is a plan view in the tape unloading state, Figure (c) is a side view seen from the drum side in the tape loading state, and Figure 2 is an enlarged view of the tape running path near the rotating head drum. , FIGS. 3(a) and (b) are plan views showing specific configurations of each part of the tape loading mechanism in the tape loading state, and FIGS. 4(a) and (b) are specific diagrams of each part of the tape loading mechanism. FIG. 5 is a partial plan view showing the specific structure of the mode switching mechanism; FIG. 6 is a plan view showing an example of a conventional tape loading mechanism. l...Main chassis 2...Rotating head drum 3
...Tape entry side movable guide post 3a...Tape height regulation guide roller 3b...Auxiliary inclined guide post 4...Tape exit side movable guide post 4a...Tape height regulation guide roller 4b ...Auxiliary inclined guide post 6.7...Loading ring 15...Movable (tape exit side) main inclined guide post 23
...Mode detection gear 27...Cam disk 30...Drive gear 34...Mode lever 37...Pinch roller system (general purpose cam plate 40...Capstan 51...Tape entry side main Inclined guide post 52... Impedance roller 53... Vertical guide post 60... Movable chassis 70... Pinch roller 73... Guide post 76... Tension regulator 84... Reel lock lever l, ...Cross line 1° on the main inclined guide post on the tape entry side...Cross line C on the main inclined guide post on the tape exit side...Cassette C1...Concavity in the front of the cassette

Claims (3)

[Claims] (1) A plurality of guide posts are provided to draw out the tape from the cassette and wrap it around the rotating head drum to form a predetermined tape running path, and the tape wrapping angle at the guide post immediately before the tape enters the rotating head drum is . A recording or reproducing apparatus, characterized in that the position of each guide post is set so that the tape wrapping angle at the tape guide post immediately after the tape exit side of the rotating drum is small. (2) A plurality of guide posts are provided for pulling out the tape from the cassette and winding it around the rotating head drum to form a predetermined tape running path, and the direction in which the tape is fed to the tape entry side guide post adjacent to the rotating head drum; The tape running path is configured such that the direction in which the tape is pulled out from the tape output side guide post adjacent to the rotary head drum is inclined toward the tape input side with respect to the center line of the tape winding angle with respect to the rotary head drum. recording or playback equipment. (3) A tape guide means consisting of a height regulating post for regulating the height of the tape and an inclined post for tape winding is provided on the tape entry side and the tape exit side of the rotating head drum, respectively. The height regulating post of each tape guide means is located closer to the tape entry side than the tape winding inclined post when viewed from the center line of the tape winding angle with respect to the rotary head drum. A recording or reproducing device characterized in that it is configured such that it is located at.