JP2568264B2 - Recording or playback device - Google Patents

Description

The present invention relates to a recording or reproducing apparatus adapted to draw a tape from a cassette and wind the tape around a rotating head drum to form a predetermined tape running path.

(Prior Art) Conventionally, in a video tape recorder (hereinafter referred to as a VTR), various operations such as recording and reproduction in which a tape is pulled out from a cassette and wound around a rotating head drum to form a predetermined tape running path are performed. The possible tape loading mechanism is adopted.

There are various types of tape loading mechanisms of this type, such as the so-called M loading type, U loading type, and improved types of these tape loading types, depending on the design of the recording format and the tape running path.

In particular, the M loading method, which has been mainly used for so-called VHS type devices, has one movable guide block on the tape head side and one tape guide side on the rotary head drum, and these can be arranged on the same plane. The feature is that the mechanism is simple and the projected area is small.

However, in recent years, with the widespread use of VTRs with built-in cameras or small-sized machines that are supposed to be portable, it is essential to make the tape loading mechanism even smaller and lighter. The situation has been forced to make improvements.

For this reason, a new tape running path has been proposed in which the diameter of the rotary head drum is reduced, and a part of the rotary head drum is bite into the inside of the cassette, and the tape loading mechanism has been downsized.

However, in the above-mentioned M loading method, since tape loading is performed by one movable guide block on each of the inlet side and the outlet side, there is no room in the tape running path, and the inclination of the rotary head drum must be increased. In this case, many inconveniences occur in the design such that the capstan does not have freedom in the inclination direction, the capstan needs to be arranged in an inclined state, and the like. Therefore, the device becomes large in the thickness direction, and it is impossible to cut into the cassette, and it is difficult to reduce the size and weight of the entire device.

FIG. 6 is a plan view showing a tape running path proposed for achieving the above-mentioned object of miniaturization in the 8 mm VTR, and it becomes possible to increase the number of movable guide blocks and make the rotating head drum bite into the cassette. The tilt of the rotating head drum is reduced.

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 the chassis 100 is a tension post 101, a guide roller 102, and a rotary head drum. Through the side main inclined post 103, the rotation guide roller 104 for reducing the winding angle of the main inclined post 103, the tape height regulation guide roller 105, and the drum entry side auxiliary inclined post 106,
It is supplied to a rotatable head drum 107 which is rotatably arranged on the chassis 100 at a predetermined angle (inclined to the cassette direction by about 3 degrees) and is wound about 290 degrees. The tape pulled out from the rotary head drum 107 includes a drum exit side auxiliary tilt post 108, a height regulating guide roller 109, a rotation guide roller 110 for reducing a winding angle of a main tilt post 111 described later, and a drum exit side main tilt. It is wound around the winding reel Rt in the cassette C via the post 111, the capstan 112, the pinch roller 113, and the guide roller 114.

Also, in this tape loading device, in order to reduce the size of the device, the diameter of the rotating head drum is reduced as described above, the tape is pulled out from the cassette during the tape loading operation, and the cassette is advanced to the head drum side. When the operation is completed, the recessed head drum on the front surface of the cassette is partially bited to reduce the space.

According to the above configuration, when the tape is loaded, the guide roller 102 on the tape-entry side is moved along the guide groove 115 by the support member 116, so that the guide roller 105 for regulating the height of the tape and the drum-entry side auxiliary. Inclined post 106 has guide groove 11
By the support member 118 that moves according to 7, the drum outlet side auxiliary tilt post 108 and the height regulating guide roller 109 are moved by the support member 120 that follows the guide groove 119.
The guide roller 110 is moved by a support member 122 that moves along the guide groove 121.

Further, the tension post 101, the pinch roller 113, and the guide roller 114 have a center of rotation on a movable chassis which is mounted on the cassette C and advances to the rotary head drum at the time of tape loading, and is shown in conjunction with the movement of the movable chassis. It moves to the position and forms a tape running path.

With this configuration, the rotary head drum can be housed in the recess on the front surface of the cassette, and the size of the device can be reduced.

(Problems to be Solved by the Invention) However, as described above, when the diameter of the rotating head drum is reduced, the winding angle of the tape increases, and in order to reduce the size, it is necessary to wind the tape around the head drum in a narrow space. Since the tape running path becomes extremely complicated and the number of guide posts increases, the load on the tape running path increases and the error in the tape running path increases, resulting in stable tape running characteristics. It will be difficult. And since the mechanism becomes complicated, the cost also increases.

If the capstan is arranged parallel to the reel in order to reduce the thickness of the tape running path from the head drum to the capstan side, the degree of freedom is considerably restricted.

As described above, at the conventional technical level, it was extremely difficult to realize a compact, simple structure and a reasonably stable tape running system in the tape loading mechanism.

In addition, if the number of movable blocks is forcibly reduced to simplify the loading mechanism, the tilting direction of the head drum becomes worse, and the tilting angle becomes larger, making it difficult to increase the biting amount and increasing the height of the cassette. Inconveniences such as increased thickness were inevitable, and the miniaturization had to be sacrificed.

(Means for Solving the Problems) In order to solve the above problems, the recording or reproducing apparatus according to the present invention is designed so that a tape is pulled out from a cassette and wound around a rotary head drum to form a predetermined tape running. Alternatively, in the reproducing apparatus, the first chassis provided with the rotary head drum and the cassette can be mounted, and the mounted cassette is mounted in a first direction in which the cassette approaches the rotary head drum. A second chassis in which the cassette is movable in a second direction in which the cassette is separated from the rotary head drum, and a tape transfer unit arranged on the first chassis on the tape output side of the rotary head drum. A plurality of guides arranged between the rotary head drum and the capstan with the capstan and the predetermined tape running path formed. And a movable guide post for pulling out the tape from the cassette, wherein the inclined post for returning the tape pulled out from the rotary head drum to the reference plane of the cassette comprises a post. Is arranged in the plurality of guide posts closest to the capstan in a state where the second chassis moves in the first direction and the predetermined tape running path is formed. Configured as a feature.

(Example) Hereinafter, one example of the case where the recording or reproducing apparatus according to the present invention is applied to an 8 mm VTR will be described in detail with reference to the drawings.

1 (a), 1 (b), and 1 (c) respectively show a tape running path in the device of the present invention,
7A is a side view of the tape running path in the tape loading state, FIG. 7B is a tape unloading state, and FIG. 7C is a side view of the tape running path as seen from the side of the rotating head drum.

In each figure, reference numeral 1 is a main chassis, and 2 is a rotary head drum rotatably mounted on the main chassis 1 with a drum base 5 tilted at a predetermined angle, and is rotated at a high speed by a motor (not shown) (2700 rpm). ). Further, in this embodiment, the head drum is inclined at a right angle of 6 degrees (5 to 7 degrees) in the direction of the cassette so that the head drum can maximize the amount of bite into the recess on the front surface of the cassette during tape loading. In addition, the depth dimension and thickness of the entire device are minimized.

3 is tape T from inside cassette C at the time of tape loading
Pull out the tape and wind it around the rotating head drum 2 from the tape entry side.
The support member 3c is provided with 3a and 3b, and is moved according to the guide groove 5a formed in the drum base 5.

Similarly, 4 is a tape-moving-side movable post that pulls out the tape from the cassette C at the time of tape loading and winds it around the rotating head drum 2 from the tape-moving side.
The b is provided on the support member 4c and is moved according to the guide groove 5b formed in the drum base 5 arranged on the chassis 1.

Reference numeral 15 is a movable inclined guide post that guides the tape pulled out from the tape output side movable guide post 4 to a capstan to be described later. The guide post 15a is provided on the support member 15b and is linked to the tape output side movable guide post 4. Be moved.

76 is a tension regulator that keeps the tape tension constant by pressing the tension post against the tape pulled out from the cassette C supply reel Rs, 53 is a vertical guide post, 51 is a guide roller by 52 impedance rollers, and 40 is a tape. A capstan 70 to be transferred is a pinch roller supported by a pinch roller lever 68, and a guide post for guiding the tape ejected from the captan 40 supported by a lever 73a 73a to a take-up reel Rt in the cassette C.

As will be described later in detail, the cassette C is mounted and held on a movable chassis 60 that is slidable on the main chassis 1 with respect to the head drum 2 in the front-rear direction, and is held against the head drum during tape loading. It is configured to take a retracted position and move forward with the tape loading operation.

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

Next, explaining the tape loading operation,
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 and 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 input side and the output side of the main chassis 1, and the tension post 76a, the guide post 73a, and the pinch on the movable chassis 60. Each of the rollers 70 is located inside the tape in the recess C1 on the front surface of the cassette C.

In this state, when the tape loading operation is performed by the tape loading mechanism, which will be described later, the movable guide posts 3 and 4 on the tape entry side and the tape exit side follow the guide grooves 5a and 5b, respectively, and move outwards from the cassette. Then, the tape is pulled out from the cassette and wound around the outer circumference 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.

At the same time as the above operation, the movable chassis 60 having the cassette C mounted thereon is moved to the head drum 2 side. In conjunction with this movement, the tension regulator 76 rotates counterclockwise to move the tension post 76a to the outside of the recess C1 of the cassette C, and the pinch roller 70 moves to a position where the pinch roller 70 can approach the capstan 40 and can be crimped. Further, the guide post 73a also pivots outward of the cassette due to the clockwise rotation of the lever 73.

By the above operation, the state shown in FIG. 1A in which the tape loading operation is completed is obtained.

In this tape loading state, the tape pulled out from the supply reel RS in the cassette C is the tension post 76a, the vertical guide post 53, the inclined guide post 51, the impedance roller 52, the drum-entry movable guide post 3
Through the head drum 2 and is wound around 330 degrees (in this embodiment, the rotating head drum has a small diameter of 26.7φ), and the movable guide post 4 on the outlet side, the movable guide post 15, the capstan It is wound around the winding reel Rt in the cassette C via the guide post 73a.

Now, regarding the tape running in the tape loading state shown in FIG. 1 (a), the tape that has come out of the cassette C in more detail with reference to FIG. 1 (c) is horizontal to the vertical guide post 53. And is tilted by the next tilting guide post 51 to the angle required for introduction into the rotary head drum 2. That is, this inclined guide post 51
Is a so-called drum entrance side main inclined post that converts the tape running path into a horizontal plane and a predetermined inclined surface, and sets the tilt angle of the tape introduced into the rotating head drum in the tape running path. And the guide roller 3a of the movable guide post 3
Is a height regulating guide roller for regulating the height of the tape, and the inclined guide post 3b of the movable guide post 3 is an inclined surface on which the tape travels in order to change the traveling plane of the tape to the optimum introduction angle to the head drum 2. It is an auxiliary tilting guide post that changes.

Looking at the tape ejection side of the drum, the tape ejected from the head drum 2 is the movable guide post 4 on the drum ejection side.
As a result, the inclined guide post 15a in the next stage is converted into an inclined surface. That is, the tilted guide post of the movable guide post 4
4b is an auxiliary tilt post that changes the tilt angle of the tape running surface. After the height of the tape is regulated by the guide roller 4a, the angle of the tape running path is adjusted to the movable guide post 15a.
Is converted into the horizontal plane of the tape in the cassette C.
The movable guide post 15a is a main inclined guide post that converts the tape running surface from the inclined surface to the horizontal surface of the cassette.

As described above, since the tape on the drum output side is converted into the same plane as the tape in the cassette C in front of the capstan, it is not necessary to incline the capstan 40 with respect to the main chassis 1 and the tape can be arranged vertically. Therefore, the tape loading mechanism of the mechanism can be made thinner, and the design can be facilitated. As a result, as shown in FIG. 1 (c), the head drum 2 can be positioned at the center of the tape (the one-dot chain line) in the cassette C, and the head drum can be easily stored in the recess C1 on the front surface of the cassette C. . Also, without tilting the Capstan 40,
It can be placed vertically on the main chassis, which can facilitate the design of the mechanism. Then, it becomes possible to collect the guide parts forming the tape running on the tape center line in the cassette, and to reduce the vertically protruding portion of the head drum, thereby making it possible to greatly reduce the thickness of the mechanism.

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

In the present invention, the cross lines 1 _i and 1 _o of the main tilt guide posts 51 and 15a that determine the tape tilt angles of the head drum 2 on the tape entry side and the tape exit side, respectively, are as shown in FIG. 1 (a). Is set to.

By setting the cross line 1 _i on the tape entry side within a range of, for example, about 26 to 28 degrees with respect to the straight line 1 _r passing through the centers of both reels of the cassette C, the main inclined guide post 51 and the guide posts 52 before and after it are provided. , 53 can be arranged on the main chassis 1. Therefore, as compared with the conventional example, it is possible to reduce the movable guide block that moves the rotation guide roller for reducing the winding angle of the main inclined guide post.

On the other hand, the cross line 1 _o on the tape output side is in the range of, for example, about 25 to 30 degrees with respect to the straight line 1 _r passing through the center of both reels of the cassette C, and the distance from the head drum is 2.0 to 2.5 times the radius of the head drum. Is set to. This makes it possible to reduce the winding angle of the main inclined post 15a,
The rotating guide post for reducing the winding angle of the main inclined guide post can be eliminated.

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

On the other hand, in the conventional example shown in FIG. 6, since the cross lines are set as shown in 1 _i ′ and 1 _o ′, the tape does not run to the rotary head drum side, and the guide roller that changes the direction is used. And many others are needed.

By the way, the setting of the cross lines 1 _i and 1 _o 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 as shown in FIG. 1 (C), the height change at the entrance / exit of the head drum 2 is set to be approximately half of the tape so that the cassette of the head drum 2 is set. Although it has been described above that the amount of bite into the inside can be maximized, this makes it possible to separate the main inclined guide post from the head drum 2, that is, the cross line can be separated from the head drum.

Therefore, the size of the device can be reduced, and it is possible to avoid a tape running path that is unreasonable for the tape, such as inclining the tape at a steep angle, and to form a stable tape running path without tape damage. be able to.

By the way, according to the tape running path of the present invention, as described above, by reducing the diameter of the head drum, in conformity with the format of 8 mm VTR, in order to maintain compatibility with the conventional device,
It is also necessary to devise the layout of the guide posts. That is, since the head drum 2 has a small diameter and a large winding angle, the inclined guide rollers for height regulation easily interfere with each other on the tape input side and the tape output side with respect to the head drum.
It is not possible to simply set the arrangement to obtain a wrapping angle of 330 degrees. If the guide posts on the tape input side and tape output side of the head drum are arranged symmetrically, reverse playback and REWI
A problem occurs during reverse running of tape such as ND, that is, the tape running load on the head drum is large in the tape running path, and the drive source that winds the tape during reverse running of the tape serves as the supply reel shaft and the winding torque is increased. Since the tape tension decreases, the tape tension tends to decrease on the capstan side, which is the output side of the head drum 2. Therefore,
When the tape is reversed and fed by the capstan, when the tape is rotated in reverse at a high speed, the tape is likely to sag at the movable guide post 4 on the head drum output side.

If slack occurs here, the tape swells to the outside of the guide post due to its synthesis, bites into the head drum side, and contacts the opposing tape, so that the tape running is not smoothly performed.

In order to solve this problem, the present invention solves the above-mentioned problem by setting the positions of the respective guide posts on the movable guide posts 3 and 4 on the tape inlet side and the tape outlet side of the head drum, as described below. are doing.

FIG. 2 is an enlarged view of the tape running path (showing the center locus of the tape) in the vicinity of the tape inlet side and tape outlet side of the head drum 2. In the figure, consider a coordinate system in which the center of the tape winding portion around the tape head drum 2 is the y-axis and the coordinates of the center of the head drum are (0,0). Auxiliary inclined guide post 3b, 4b of the contacts to tape each _{A (a x, a y)} , B (b x, b y), C (c x, c y),
Let D (d _x , d _y ). Then the coordinates of the relationship between these _{points, c x> d x, a} x> b x _{and, | c x -d x | ≦} | a x -b x | and set to be.

That is, the tape winding angle with respect to the tape output side auxiliary inclined guide post 4b is set to be the tape input side auxiliary inclined guide post.
It is set in advance so that it is smaller than the tape winding angle with respect to 3b, and the tape tension on the tape exit side is smaller than that on the tape entry side.

By the way, according to the format of 8mm VTR, recording, playback,
Tape tension is an auxiliary inclined guide post on the tape entry side
It is set to 10-15g between 3b and head drum. Therefore, even if the inclination of the inclined post on the entrance side is slightly large, the characteristics are not affected, and the running load of the capstan is reduced by the amount of winding of the auxiliary inclined guide post 4b on the tape ejection side.

Further, as described above, during reverse running of the tape, the tape tension on the guide roller 4a for height regulation and the auxiliary tilted guide post 4b on the movable guide post 4 on the tape ejection side is apt to become unstable because the tape tension decreases. For example, when the tension is released for a moment, the tape loosens as shown by the alternate long and short dash line in FIG. 2 and bulges outward due to the rigidity of the tape itself, making contact with the tape between the guide posts 3a and 3b on the tape entry side,
Although there was a risk of being caught in the head drum, according to the device of the present invention, the tape winding angle of the auxiliary inclined guide post 4b on the tape exit side was set to be smaller than that on the entrance side. It is possible to connect smoothly with the close battle of and prevent the tape from cutting into the head drum side. Further, for the same reason, as shown in the figure, it is desirable that the distance between the head drum and the auxiliary inclined post is set wider on the tape outlet side than on the tape inlet side.

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

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

In each drawing, a rotary head drum 2 is rotatably mounted on a main chassis 1 via a drum base 5, and is rotated by a motor (not shown) at a predetermined speed (2700 rpm in this embodiment). It has become. The guide grooves 5a and 5b formed on the drum base 5 on both sides of the head drum 2 are engaged with the support member 3c of the tape-entry side movable guide post 3 and the support member 4c of the tape-outside movable guide post 4, respectively. , Are designed to move along these guide grooves.

On the main chassis 1 below the drum base 5, a loading ring (lower ring) 6 that moves the tape-out side movable guide post 4 along the guide groove 5b, and a tape-in side movable guide post 3 along the guide groove 5a. A loading ring (upper ring) 7 that moves by means of rollers 8a to 8c is rotatably arranged in a vertically stacked state with a predetermined gap therebetween.

On the loading ring 6, an arc-shaped operating lever 9
Is slidable in the rotation direction of the ring by the elongated holes 9a, 9a and the pins 6b, 6b on the ring 6 and is urged counterclockwise by the spring 10 against the ring 6. It is distributed in. The actuating lever 9 is provided with a movable guide post 4 on the tape ejection side via a rotatable connecting lever 11 of a pin 9c at the front end thereof.
The loading ring 6 is connected to the supporting member 4c of the
The movable guide post 4 on the tape delivery side can be moved by rotating the. A connecting lever 12 is rotatably attached to a pin 9d at the rear end of the operating lever 9, and a supporting member 1 having a movable guide post 15a at the free end of the connecting lever 12 is provided.
5 is attached by pin 15b. Connection lever 12
Is urged counterclockwise by a coil spring 13 arranged around the pin 9d, and its rotation range is regulated by known means. In the tape loading state, the engaging recess 15c at the front part of the support member 15 is pressed against the positioning pin 14 on the main chassis 1 by the spring 13 to regulate the position. As for the movable guide post 4 on the tape delivery side, the spring 10 is charged by further rotating the loading ring 7 after reaching the tape loading completion position, and the biasing force of the spring 10 causes the guide post 4 to move. It is designed to perform positioning.

On the other hand, the loading ring 6 is connected by a connecting lever 16 arranged between the pin 8b and the pin 3d on the supporting member 3c of the tape-inserting side movable guide post 3 to rotate the loading ring 6. Therefore, the tape entry side movable post 3 can be moved.

In addition, the loading rings 6 and 7 each have a gear part 6 on the outer circumference.
A and 7b are formed on the main chassis 1 via a support plate 17 and are rotatably arranged and meshed with gears 18 and 19 meshing with each other. This support plate 17 is biased toward the loading ring by a spring 20 in order to ensure the meshed state of each gear. As a result, the loading rings 6 and 7 are always rotated in the opposite directions and at the same angle.

On the other hand, at the upper left of the main chassis 1, a loading motor 21 serving as a drive source for the tape loading operation is attached, and a mode detecting gear 23 is attached via a pinion 21a and a reduction gear 22 attached to its rotation shaft. To the loading rings 6, 7 via gears 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 gear in which gears that mesh with the gear 25 and the mode detection gear 23 are arranged in two layers, and a tooth notch is formed at a predetermined position on the outer periphery of the gear that meshes with 25. Therefore, according to each mode, when the mode detection gear 23 is rotated without transmitting the rotation to the loading ring, an electrode pattern for detecting the rotational position is formed, and the pattern is formed on the chassis facing the pattern. A detector such as a brush or a photo sensor for detecting the position is arranged, whereby the rotational position of the mode detection gear 23 is detected to control the cam board 27 and various operation modes can be set. it can.

The mode detection gear 23 includes a cam board 27 for controlling various brake mechanisms, tension regulators, etc. described later.
Are engaged via a gear 27b on the outer periphery of the cam disc 2
7 is a movable chassis 6 which will be described later via a reduction gear 29.
It is meshed with a drive gear 30 for driving 0. A drive pin 30a that engages with the movable chassis 60 is arranged on the drive gear 30.

A cam groove 27a for controlling a tension regulator, which will be described later, various brakes, etc. according to various operation modes is formed on the upper surface of the cam board 27. The rotation shaft of the gear 25 is fixed to the cam follower pin 2 which is always engaged with the cam 27a.
A control lever 26 for forming a brake 6a and a brake control lever 26 are rotatably arranged, and a cam follower pin 32a engaging with the inside of the cam 27a is formed at one end on the lower chassis of the cam board 27 in the figure. A control lever 32 is arranged which rotates about a pin 33 on the chassis as an axis according to the rotation of the cam board 27. The other end of the control lever 32 is connected to the left end of the mode lever 34, which is slidable left and right by the pins 54a, 54b on the main chassis 1 and the elongated holes 34a, 34a.
Is slid to the left and right by the control lever 32 according to various modes, and controls the brake mechanism and the like.

To the right of the mode lever 34 is the pinch roller control lever.
35 is rotatably arranged by a pin 36, and is connected to the right end of the mode lever via a pin 35a at one end thereof. On the pinch roller control lever 35, a cam plate 37, which will be described later, and an engagement pin 35 that controls the brake of the take-up reel stand
c and 35b are formed respectively.

On the right side of the control lever 35, attach one end to a pin on the chassis 1.
It is rotatably attached to 38 and is an engaging pin of control lever 35.
A cam plate 37 having a cam groove 37b which is constantly engaged with 35c and a cam groove 37a which controls a pinch roller actuating lever described later is arranged.

Further, between the cam plate 37 and the chassis, one end is provided with an engaging portion 48a capable of engaging with the right end portion 34c of the mode lever 34, and the other end is unlocked by a cassette holder (not shown) in a closed state. An eject lever 48 having an engaging portion 48b for releasing the cassette holder is rotatably arranged by a pin 49 and is urged clockwise by an integrally molded spring piece 48c. When the mode lever 34 is moved to the right, it is rotated counterclockwise to release the lock of the cassette holder at the engaging portion 48b.

The tape running system before and after the rotary head drum 2 will be described below.
Above, as mentioned above, the tape main tilt guide post 51,
An impedance roller 52 and a vertical guide post 53 are arranged respectively.

There is a capstan on the chassis 1 at the tape output side.
40 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 the rotation is transmitted to the reel drive gear 44 that is rotatable to the pulley gear 42, the belt 43, and the pin 55 on the chassis 1. Further, a small-diameter gear 45 is coaxially arranged on the drive gear 44, and an idler gear 47 is arranged so as to be constantly meshed with the gear 45 by a rotating arm 46. A friction member (not shown) is interposed between the rotating arm and the idler gear 47, and is configured so as to select a reel stand which is pivotally driven by a constricting operation according to the rotation direction of the gear 45.

In the figure, 1a to 1c are guide pins for guiding the movable chassis 60, which will be described later, slidably back and forth, and 1d and 1e respectively control a guide lever 73 and a tension regulator 76, which will be described later, according to the position of the movable chassis 60. It is a notch for doing.

Reference numeral 50 is a rack plate that controls a supply reel base brake lever on the movable chassis 60, which will be described later.

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

The movable chassis 60 slides back and forth with respect to the head drum by engaging the pins 1a to 1c on the main chassis 1 and the support shaft 38 of the cam plate 37 for controlling the pinch roller in the elongated holes 60a to 61d, respectively. The cassette holding means (not shown) is freely openable and closable so that the cassette can be attached and detached at a position retracted from the rotary head drum.

On the movable chassis 60, a supply reel unit unit 61 and a take-up reel unit unit that engage and rotate the supply reel and the take-up reel of the cassette C mounted on the movable chassis 60, respectively.
62 are rotatably arranged.

Between the reel stands, a long hole 60e engaged with the drive pin 30a of the drive gear 30 on the main chassis 1 that slides back and forth on the movable chassis 60, and an idler gear 4 on the main chassis 1 are engaged.
Is formed with a notch 60f.

On the upper right side of the take-up reel stand unit 62, a guide lever 73 having a guide post 73a at one end is rotatably arranged by a pin 74, and the other end has an engaging hole of the main chassis 1. An engagement pin 73b that engages with 1d is formed, and the movable chassis 60 is engaged with the engagement pin 73b to guide the guide lever 7b.
An engagement hole 60g for restricting the rotation range of 3 is formed.

To the left of the guide lever 73, pinch roller on one end.
A pinch roller lever 68 provided with 70 is rotatably supported by a pin 69 and is coaxially arranged.
71 and a spring 72 are connected, and they are attached so as to rotate integrally via the spring 72. The engaging pin 71b at one end of the operating lever 71 projects above the main chassis from the long hole 60h of the movable chassis 60 and is engaged in the cam groove 37a of the cam plate 37 for controlling the pinch roller. The movement is controlled by the cam groove 37a.

The gear portion of the take-up reel first unit 62 is rotatably arranged by a pin 64 in a state where a gear 63 frictionally coupled to a brake lever 65 is always meshed. When the take-up reel rotates counterclockwise, the rotational force of the take-up reel causes it to jump into the reel gear and apply a brake. 60i is the stopper 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 urged clockwise by an integrally formed spring piece to form an engaging portion 66b protruding downward of the movable chassis into the main chassis. Upper control lever 3
5 is controlled by the engagement pin 35b.

On the other hand, on the left side of the movable chassis, the tension post 76
A tension regulator 76 having a is rotatably supported by a pin 75 and is urged counterclockwise by a spring 77.
The tension regulator controls the band brake 78 wound around the reel stand according to the tape tension detected by the tension post 76a so that the tape tension becomes constant.

Further, on the left side of the supply reel base unit 61, a brake lever 79 is rotatably arranged about a shaft 80, and its free end is
The pin 82 is connected to an engaging pin 81a on a rotatable gear 81, and is engaged with and disengaged from a reel base 61 according to the rotation direction of this gear. A gear that constantly meshes with the rack plate 50 on the main chassis 1 is frictionally coupled to the gear 81, and when the movable chassis 60 moves back and forth, the brake lever 79 moves the reel base 61.
Engage and disengage.

The brake lever 79 can be engaged with the engaging portion 83a at one end of the rotating piece 83 arranged above the brake lever 79, and can also be controlled by this. That is, the engaging portion 83a of the rotating piece 83 is the cam board 27
The lever 26 is located at a position where it can be engaged with the free end of the lever 26 which is rotationally controlled by the cam disk 27, and the brake control of the reel base is appropriately performed by the cam board 27 according to the operation 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 urged clockwise by a spring 86, and the reel lock release lever in the cassette is released at one end. Pin 84 to engage with piece
The other end 84a is connected to one end of a substantially Y-shaped lever 88 rotatable about a shaft 87 on the movable chassis. Abbreviation Y
Engaging arms 88a, 88c are formed on the other end side of the L-shaped lever 88 so as to be engaged with the guide pin 1b on the main chassis at both ends of the guide hole 60b. Therefore, as 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 rotate to control the locking and unlocking of the reel in the cassette. It is configured.

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

Also, the other end of the lever 89 presses the reel stand from above the band brake 78 to brake gently.
Acts as.

Incidentally, reference numeral 92 in the drawing denotes a cassette detection switch for detecting the loading of the cassette.

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

The tape loading mechanism of the present invention is configured as described above, and its operation will be described below.

In the tape unloading state shown in FIGS. 3A and 3B, the movable chassis 60 is retracted from the head drum 2 by the drive pin 30a of the drive gear 30, and the state of FIG. As will be apparent with reference to both figures, the state immediately before the tape loading operation is started after the cassette C is loaded is shown.

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

On the other hand, the cam disk 27 is located at a position slightly counterclockwise rotated from the position where it is fully rotated clockwise, and the cam follower pin 32a of the control lever 32 is immediately before the minimum diameter portion of the cam groove 27a. Therefore, the mode lever 34 is located immediately before the rightmost position. When the cam board 27 is further rotated in this state in the clockwise direction, the engagement pin 32a of the lever 32 is locked by the cam groove 27a.
When it moves to the smallest diameter portion, it rotates counterclockwise, moves the mode lever 34 to the right, and operates the eject lever 55. As a result, the lock of the cassette holder (not shown) is released, and the cassette is ejected. This state is shown in FIG. 5 (b).

When the engagement pin 71b of the operating lever 71 is located below the cam groove 37a of the cam plate 37, the pinch roller 70 rotates the pinch roller lever 68 counterclockwise and is housed in the recess C1 of the cassette. Has been done.

The guide post 73a is housed in the recess C1 of the cassette C as the lever 73 is rotated counterclockwise by the pin 73b and the guide hole 1d on the main chassis.

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

Looking at the supply reel side, the tension regulator 76
When the pin 76b is located in the main chassis upper slot 1e downward, the pin 76b rotates clockwise to position the tension post 76a in the recess C1 of the cassette C. Therefore, the band brake is also released and it is in a non-operating state.

When the movable chassis 60 is retracted, the brake 79 is
Since the gear 81 is rotated clockwise by the rack 50 of the main chassis, it is moved to the reel stand 61 and is in the braked state.

On the other hand, the guide pin 1b on the main chassis is movable
It is located at the upper end of the long hole 60b of 60 and rotates the Y-shaped lever 88 in the clockwise direction, so that the reel lock release lever 84 is in the position rotated in the counterclockwise direction, even if the cassette is loaded. Reel lock has not been released. Further, the lever 89 rotates counterclockwise to urge the Y-shaped lever, and one end of the lever 89 is pressed against the reel stand from above the band brake.

The above state shows the tape unloading state immediately before the cassette loading operation is started and the cassette loading operation is started, or just before the cassette is ejected.

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

The cassette is loaded in the device and the cassette detection switch
When this is detected by 92, the motor 21 is energized by the control circuit (not shown), and the mode detection gear 23 is rotated clockwise. The mode detection gear 23 is a cam disk 27 and a toothless gear.
Rotate 24 counterclockwise. Furthermore, the rotation of the cam board 27
It is transmitted to the drive gear 30 and serves as a drive source for moving the movable chassis 60 to the head drum side. The rotation of the tooth-missing gear 24 is transmitted to the loading rings 6 and 7 via the gear 25 and serves as a drive source for the tape loading operation.

During the movement from the eject state to the unload state, the toothless gear 24 does not transmit the driving force to the loading ring. When the cam disk 27 has rotated to the unloading position shown in FIGS. 4 (a) and 4 (b), the toothless gear 24 and the gear 25 are engaged, and the loading rings 6 and 7 rotate in opposite directions. , The movable guide posts 3, 4 are moved along the guide grooves 5a, 5b, and the movable guide post 15 is also moved in conjunction with the movable guide post 4.
By these, the tape is pulled out from the cassette C,
Wrapped around head drum 2 (330 degrees).

On the other hand, the rotation of the cam board 27 is reduced by the gear 29,
Rotate 30 counterclockwise. Due to the rotation of the drive gear 30, the movable chassis 60 is advanced to the head drum 2 side with the drive pin 30a.

By moving the movable chassis 60 forward, the pinch roller lever 68
Is rotated clockwise by the engagement pin 71b of the operating lever 71 moving upward in the cam groove 37a of the cam plate 37 for controlling the pinch roller on the side of the main chassis 1 so that the pinch roller is rotated clockwise. 70 is moved to a position in close proximity to the cap 40.

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

In addition, as the movable chassis 60 moves forward,
66 is pushed down by the control lever 35, the brake lever 65 becomes free, and thereafter the braking state is controlled by the winding reel 62 depending on the rotating direction. That is, the brake is automatically applied to the reel base by rotating counterclockwise. It should be noted that this brake acts via a friction clutch and is not a brake but a control of back tension.

The tension regulator 76 also has its engaging pin 76b.
Is rotated counterclockwise by moving upward in the long hole 1e on the main chassis 1, and the tension post 76a
Is moved to the outside of the cassette and is in the operating position.

Further, since the gear 81 rotates counterclockwise by the forward sliding of the movable chassis 60, the brake lever 79 is rotated in the direction away from the reel stand during this operation. Therefore, the supply reel base is not braked and the tape can be pulled out smoothly during tape loading.

When the movable chassis 60 starts to move forward, the guide pin 1b moves downward in the elongated hole 60b on the movable chassis as seen in the figure, so that the Y-shaped lever 88 becomes free and the reel lock release lever 84 rotates clockwise. The reel lock in the cassette is released by the engagement pin 84b.

Further, the lever 89 is rotated clockwise with the rotation of the Y-shaped lever 88, and one end thereof is separated from the reel base 61.

As a result of the above tape loading operation,
The tape loading state shown in the figure is reached. The characteristics of the tape running path formed by this are as described above.

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

This tape unloading state is the stop mode in which the tape loading is completed. In this state, the tooth-missing gear 24 has a tooth-missing portion facing the gear 25 and is in a state of not transmitting rotation. Therefore, after the tape loading process is completed, the cam disk 27 is rotated without moving the loading rings 6 and 7, and the mode lever 34 is controlled by the cam 27a and the control lever 35 is operated. Then, the pinch roller is controlled via a brake and a cam plate 37 for controlling the pinch roller.

FIG. 5A shows the relationship between the cam board 27 and the mode lever 34 in the recording or reproducing state.

FIG. 5B shows the relationship between the cam board 27 and the mode lever 34 at the time of ejecting.

FIG. 5 (a) shows that the cam disk 27 is further rotated counterclockwise from the tape loading state of FIGS. 3 (a) and 3 (b). After moving to the left position, the control lever 35 and the cam plate 37 control the pinch roller operating lever 71 to move the pinch roller 70.
Is pressed to Kyapstan 40.

Further, FIG. 5 (b) is, as described above, shown in FIG. 3 (a),
In the tape unloading state shown in (b), the mode lever 34 is moved to the rightmost position and the eject lever 55 can be operated.

The above-mentioned operation modes are set by the mode detection gear 23
The position of the cam board 27 is detected by means of this, and this is carried out by controlling this.

The tape unloading operation may be performed by reversing the above operation, and the description thereof will be omitted.

As described above, according to the present invention, when the diameter of the rotary head drum is reduced in accordance with the miniaturization of the apparatus, the guide post can be made thin even if the winding angle is inevitably increased. The number of etc. is reduced to simplify the configuration, and a more stable and tape-free tape running path is realized.

In addition, according to the present embodiment, the case where it is applied to the 8 mm VTR has been described, but the present invention is not limited to this, and is applied to any device in which the tape winding angle tends to increase with the downsizing of the head drum. can do.

(Advantages of the Invention) According to the configuration of the invention of the present application, the movable inclined post is included in the plurality of guide posts disposed between the rotary head drum and the capstan in a state where a predetermined tape running path is formed. Since it is located closest to the capstan, the distance between the rotary head drum and the movable tilt post can be increased, and if the twist of the tape with respect to the movable tilt post is the same, lower the position of the rotary head drum in the height direction. be able to.

Further, in the above state, since the second chassis is moving in the first direction, that is, the cassette is close to the rotary head drum, the position of the rotary head drum in the height direction is low. Together with this, it becomes possible to increase the amount of biting of the rotary head drum into the front surface of the cassette.

Further, in the configuration of the present invention, since the number of guide posts can be reduced, the position of the rotary head drum in the height direction can be lowered, and the amount of bite of the rotary head drum into the front surface of the cassette can be increased. Considering that it becomes possible, the tape loading mechanism can be miniaturized, thinned, and simplified.

[Brief description of drawings]

FIGS. 1 (a), (b), and (c) are a plan view and a side view, respectively, for explaining a tape running path in the recording or reproducing apparatus of the present invention. FIG. 1 (a) shows a tape loading state. FIG. 2B is a plan view of the tape unloading state, FIG. 2C is a side view of the tape loading state as seen from the drum side, and FIG. 2 is an enlarged view of the tape running path near the rotary head drum. 3 (a) and 3 (b) are plan views showing a specific configuration of each part of the tape loading mechanism in a tape loading state, and FIGS. 4 (a) and 4 (b) are specific views of each part of the tape loading mechanism. FIG. 5 is a plan view showing a structure in a tape unloading state, FIG. 5 is a partial plan view showing a concrete structure of a mode switching mechanism, and FIG. 6 is an example of a conventional tape loading mechanism. It is a plan view. 1 …… Main chassis 2 …… Rotating head drum 3 …… Tape-entry movable guide post 3a …… Tape height regulating guide roller 3b …… Auxiliary tilt guide post 4 …… Tape exit movable guide post 4a …… Tape Height-regulating guide roller 4b …… Auxiliary tilt guide post 6,7 …… Loading ring 15 …… Movable (tape exit side) Main tilt guide post 23 …… Mode detection gear 27 …… Cam disk 30 …… Drive gear 34 …… Mode lever 37 …… Pinch roller control cam plate 40 …… Capstan 51 …… Tape entry side main tilt 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 1 _i …… Cross line on the taper side main tilt guide post 1 _o …… Tape exit Cross line on the side main tilt guide post C …… Casette C ₁ …… Recess in front of the cassette

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidetoshi Matsuoka Inventor Hidetoshi Matsuoka, 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc., Tamagawa Plant (72) Junji Kobayashi 770 Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Canon Inc. In-house (72) Inventor Makoto Fujiki, 770, Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc., Tamagawa Plant (56) Reference JP-A-63-275066 (JP, A)

Claims (1)

(57) [Claims] 1. A recording or reproducing apparatus adapted to draw a tape from a cassette and wind the tape around a rotary head drum to form a predetermined tape running path, the first chassis having the rotary head drum. A first direction in which the cassette can be mounted, the mounted cassette is close to the rotary head drum, and a second direction in which the mounted cassette is separated from the rotary head drum
A second chassis movable in the direction of, a capstan for tape transfer arranged on the first chassis on the tape ejection side of the rotary head drum, and the predetermined tape running path. In the formed state, it is provided with a plurality of guide posts arranged between the rotary head drum and the capstan, and returns the tape pulled out in an inclined state from the rotary head drum to the reference surface of the cassette. The inclined post is constituted by a movable guide post that draws out the tape from the cassette, and the movable inclined post is in a state where the second chassis moves in the first direction and the predetermined tape running is formed. The recording or reproducing apparatus is characterized in that it is arranged closest to the capstan among the plurality of guide posts.