JPH02165458A - Recording or playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a recording or reproducing apparatus that pulls out a tape from a cassette and winds it around a rotating 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 rotating head drum to form a predetermined tape running path for various purposes such as recording and playback. A tape loading mechanism is used to enable operation.

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

In particular, the M loading system, which has been mainly used in so-called VHS system devices, has one movable guide block on the tape inlet side and one on the tape outlet side of the rotating head drum, and can arrange them on the same plane. Therefore, it has the characteristics of a simple mechanism and a small projected area.

However, in recent years, as camera-integrated VTRs and small portable devices have become widespread, it has become essential to make the tape loading mechanism even smaller and lighter, and improvements have been made to the tape loading system to make it even more compact. The situation has become such that they are forced to do so.

For this reason, a new tape running path has been proposed in which the diameter of the rotating head drum is reduced and it partially cuts into the inside of the cassette, leading to a reduction in the size of the tape loading mechanism.

However, in the above-mentioned M loading method, the tape is loaded using one movable guide block on the input side and one on the output side, so there is not enough room in the tape running path, and the inclination of the rotating head drum must be increased. This causes many design inconveniences, such as the capstan not being able to be tilted, the inclination direction becoming inflexible, and the capstan having to be placed in an inclined position. Therefore, the device becomes thick in the thickness direction and cannot be inserted into the cassette, making it difficult to reduce the size and weight of the entire device.

Figure 1 is a plan view showing a tape running path proposed to achieve the above-mentioned goal of miniaturization in an 8mm VTR, which makes it possible to increase the number of movable guide blocks and make the rotating head drum fit into the cassette. This reduces the inclination of the rotating head drum.

In the figure, a 611 tape (hereinafter referred to as tape) T pulled out from a supply reel Rs in a cassette C loaded in a predetermined cassette mounting part on the chassis 100 is connected to a tension post 101, a guide roller 102, a rotating head Drum entry side main inclined post 103, main inclined post 103
a rotating guide roller 104 for reducing the wrapping angle of the
A rotary head drum is rotatably arranged on the chassis 100 at a predetermined angle (approximately 3 degrees tilted toward the cassette) via a guide roller 105 for tape height regulation and an auxiliary inclined post 106 on the drum entry side. 107 and is wound approximately 290 degrees. Rotating head drum 107
The tape that has been pulled out is transferred to the drum exit side auxiliary inclined post 108, the height regulating guide roller 109, the rotating guide roller 110 for reducing the wrapping angle of the main inclined post 111 (described later), the drum exit side main inclined post 111, and the cap. Stan 112, pinch roller 113, guide roller 114
It is wound onto the take-up reel Rt in the cassette C via the cassette C.

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

According to the above configuration, during tape loading, the guide roller 102 on the tape entry side is connected to the tape height regulating guide roller 105 and the drum entry side auxiliary inclined post 106 by the support member 116 that moves along the guide groove 115.
is a support member 118 that moves along the guide groove 117.
Accordingly, the drum output side auxiliary inclined post 108 and the height regulating guide roller 109 are moved by the guide roller 11 by the support member 120 that moves according to the guide i'*119.
0 is the support member 12 that moves according to the guide groove 121
2 respectively.

The tension post 101, the pinch roller 113, and the guide roller 114 have their rotation centers on the movable chassis on which the cassette C is placed and advance it to the rotating head drum during tape loading. It moves to a certain 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, making it possible to downsize the apparatus.

(Problems to be Solved by the Invention) However, as mentioned above, reducing the diameter of the rotating head drum increases the tape wrapping angle, and in order to downsize the tape, it is necessary to wrap the tape around the head drum in a narrow space. (As a result, the tape running path becomes extremely complex, the number of guide posts increases, and as a result, the load on the tape running path increases and the error in the tape running path increases, making it difficult to obtain stable tape running characteristics.) In addition, the mechanism becomes more complicated, which increases the cost.

As described above, at the conventional level of technology, it has been extremely difficult to reduce the size of the tape loading mechanism, simplify the structure, and realize a reasonably stable tape running system.

(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 and winding it from the entrance and exit sides of a rotating head drum. The guide means includes a plurality of guide means for forming a predetermined tape running path, and a capstan for transporting the tape on the tape output side of the rotary head drum, and the guide means for forming the tape running path on the tape input side of the rotary head drum. The guide means having one movable guide member and forming a tape running path on the tape output side of the rotary head drum has two movable guide members between the rotary head drum and the capstan. It's about doing.

(Function) As a result, the inclination angle of the rotary head drum can be reduced, and space can be reduced by storing it in the recess on the front surface of the cassette. It is possible to realize a tape loading mechanism with a reduced number of tapes, a simple configuration, and stable tape running characteristics.

(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,
A motor (not shown) rotates at high speed (2700r, p,
m, ). In addition, in this embodiment, the head drum is placed approximately at right angles to the direction of the cassette at 6 degrees (5 degrees to 7 degrees).
By tilting the head drum to the maximum extent possible, the depth and thickness of the entire device are minimized by tilting the head drum into the recess on the front surface of the cassette to the maximum extent possible during tape loading.

Reference numeral 3 denotes a movable guide post on the tape entry side that pulls out the tape T from the inside of 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 output 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 output side, and includes guide posts 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 output 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 1, 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 guide grooves 5a 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 outward from 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 RS in the cassette C is transferred to the tension post 76a, the vertical guide post 53, and the inclined guide post 5.
1, 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
In this embodiment, a small-diameter one with a diameter of 26.7 φ is used as the rotating head drum), the drum exit side movable guide post 4, the movable guide post 15, the capstan 40, and the guide post 73a. It is wound onto a winding loop Rt in a cassette C.

Now, the tape running path in the tape loading state shown in FIG. 1(a) will be explained in more detail with reference to FIG. 1(c). 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, this 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 surface, 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 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 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 the guide roller 4a, the angle of the tape running path is converted to the horizontal plane of the tape in the cassette C by the 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 term "cross line" refers to 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 cross line l6,1° of the main inclined guide posts 51, 15a, which determines the tape inclination angle on the tape entry side and the tape exit side of the head drum 2, respectively, is as shown in FIG. 1(a). is set to .

The cross line 11 on the tape entry side is a straight line 1. passing through the centers of both reels of the cassette C. For example, by setting the angle within a range of about 26 to 28 degrees, the main inclined guide post 51
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 10 on the tape exit side is, for example, 25 to 3
The distance from the head drum is set within a range of approximately 0 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 line is set at 1+', 1°'' as shown in the figure, so the tape does not run toward the rotating head drum, and the guide roller that changes the direction is used. etc. are required in large numbers.

By the way, the setting of the cross line l, , 1° 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 8mm 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 height regulation interfere with each other on the tape entry and exit sides of the head drum. The resulting configuration cannot be simply set. Furthermore, if the guide posts on the tape entry and exit sides are arranged symmetrically with respect to the head drum, problems will occur when the tape runs in reverse during reverse playback, REWIND, etc. The 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. It becomes a trend.

Therefore, when the tape is fed out in reverse by the capstan, the tape tends to sag 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 bulges outward from the guide post due to the combination of slack, bites into the head drum, or comes into contact with the opposing tape, making it difficult for the tape to travel 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 inlet and outlet sides 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 entrance and exit 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, O). The contact points of the auxiliary slope guide posts 3b, 4b and the height regulating guide posts 3a, 4b to the tape are A (a, l, ay) B (bx, by), C, respectively.
(CM, cy)+D (dx, d,). Then, the relationship between the coordinates of these points is set so that CIl > dx, ax > bx, and Ic1l-dxl≦law-t)++.

In other words, the tape winding angle on the tape exit side auxiliary inclined guide post 4b is smaller than the tape wrapping angle on the tape entry side auxiliary inclined guide post 3b (and the tape tension on the tape exit side is smaller than on the tape entry side). It is set.

Incidentally, according to the 8 mm VTR format, the tape tension during recording and reproduction 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 inclined post on the entry side is somewhat large, the characteristics are not affected, and the running load on the capstan is reduced by the amount of winding of the auxiliary inclined guide post 4b on the tape exit side.

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 Fig. 2, bulges outward due to the rigidity of the tape itself, 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 winding angle of the auxiliary inclined guide post 4b on the tape exit side is set to be smaller than that on the entrance side, so the head It connects smoothly with the drum direction, and prevents the tape from digging into the head drum side.Also, for the same reason, as shown in the same figure, the distance between the head drum and the auxiliary inclined post is also It is desirable to make the tape wider on the tape exit side than on the 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.

3(a) and 3(b) are plan views showing the states on the main chassis 1 and the movable chassis 60, respectively, in the tape loading state, and FIGS. 4(a) and 4(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 the main chassis 1 via a drum base 5, and is rotated at a predetermined speed (2700 r, plm, in this example) by a motor (not shown). It has become. Also, the drum base 5 on both sides of the head drum 2
The support member 3C of the tape entry side movable guide post 3 and the support member 4C of the tape exit side movable guide post 4 are respectively engaged with the guide grooves 5a and 5b formed above, and the tape is moved along these guide grooves. It is supposed to be done.

On the main chassis 1 below the drum base 5,
6. A loading ring (lower ring) that moves the tape exit side movable guide post 4 along the guide groove 5b. A loading ring (upper ring) 7 that moves the tape entry side movable guide post 3 along the guide groove 5a is connected to rollers 8a to 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 slidable in the ring rotational direction by its elongated holes 9a, 9a and pins 6b, 6b on the ring 6, and is attached to the ring 6 by a spring 10. It is arranged in a state where it is biased counterclockwise. This operating lever 9 has a bin 9 at its front end.
It is connected to the support member 4C of the tape ejection side movable guide post 4 via a zero-rotatable connection lever 11, and the tape ejection side movable guide post 4 can be moved by rotation of the loading ring 6. Further, a connecting lever 12 is rotatably attached to the bin 9d at the rear end of the operating lever 9, and a movable guide post 1 is attached to the free end of the connecting lever 12.
A support member 15 with 5a is attached by means of a pin 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. In the tape loading state, the engagement recess 15c of the front part of the support member 15 is inserted into the positioning bin 14 on the main chassis l.
are pressed against each other by a spring 13, and its position is regulated. In addition, regarding the tape ejection side movable guide post 4, after reaching the tape loading completion position, the loading ring 7 is further rotated to release the spring 1.
0 is charged, and the guiding force is used to position the guide post.

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 loading motor 21 that serves as a drive source for tape loading operation is attached to the upper left of the main chassis l, and a pinion 21a attached to the rotating shaft of the loading motor 21 is attached to the upper left of the main chassis l.
, [is transmitted to the mode detection gear 23 via the speed 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 for detecting the rotational position of the mode detection gear 23 to control the cam disk 27 and set various operation modes.

The mode detection gear 23 includes a cam disk 2 for controlling various brake mechanisms, tension regulators, etc., which will be described later.
7 are meshed with each other via a gear 27b on its outer periphery, and the cam disc 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 60 is mounted on the drive gear 30.
A drive pin 30a is provided which engages with the drive pin 30a.

A cam groove 27a is formed on the upper surface of the cam disk 27 for controlling a tension regulator, various brakes, etc., which will be described later, according to various operation modes. and gear 2
A control lever 26 for controlling the brake and a cam follower pin 26a that is always engaged with the cam 27a are rotatably disposed on the rotating shaft of the cam disc 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 control lever 32 has its other end connected to the bins 54a, 54b on the main chassis 1 and the elongated hole 3.
4a and 34a, the mode lever 34 is connected to the left end of a mode lever 34 which is arranged to be slidable left and right, and the mode lever 34 is slid left and right by the control lever 32 according to various modes to control the brake mechanism and the like.

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 arranged so as to be rotatable by a pin 49, and is 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, there are tape main inclined guide posts 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 drawings, 1a to 1c are guide bins for slidingly guiding a movable chassis 60, which will be described later, and ld and le are guide levers 73, which will be described later, respectively. 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 spindles 38 of the cam plate 37 for controlling the bottles 1a to IC and the pinch roller on the main chassis 1 into the long holes 60a to 60d, respectively. 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 in which the drive bin 30a of the drive gear 30 on the main chassis l that slides the movable chassis 60 back and forth is engaged, and a notch 60f in which the idler gear 47 on the main chassis l 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 from the elongated hole 60h and is engaged in the cam groove 37a of the 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 means of a pin 64, in constant meshing state. When the take-up reel rotates counterclockwise, the rotational force causes the reel to jump into the reel 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 76 on the left side of the movable chassis.
A tension regulator 76 equipped with a tension regulator 76 is rotatable by a pin 75 and biased counterclockwise by a spring 77. Tension regulator is tension post 76
The band brake 78 wound around the reel stand is controlled according to the tape tension detected in step a, 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 its free end is connected to an engagement bin 81a on a gear 81 that 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 back and forth 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
It is located at an opposing position where it can engage 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. The other end 84a is mounted on a shaft 87 on the movable chassis.
The lever 88 is connected to one end of a substantially Y-shaped lever 88 that is rotatable. The other end of the substantially Y-shaped lever 88 is formed with engaging arms 88a and 88c that can be engaged with the guide bin 1b on the main chassis at both ends of the guide hole 60b, respectively. Therefore, by the back and forth movement of the movable chassis 6o, the rotation is controlled by the guide bin lb on the main chassis, and the reel lock lever 84 is rotationally controlled to control locking and unlocking of the reels in the cassette. There is.

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 side 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 groove 37a of the cam plate 37, so that the pinch roller lever 68 is rotated counterclockwise.
It is 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 1d 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 apart from the engagement pin 35b of the control lever 35, so it is forcibly rotated counterclockwise and held 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. 1. 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 figure 7 lever 88 is rotated clockwise, the reel lock release lever 84 is in a counterclockwise position, even if a cassette is loaded. , the reel lock is not released, and the lever 89 is rotated counterclockwise to bias the Y-shaped bar and press one end of the bar 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. 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, thereby moving the tape into the cassette C.
It is pulled out from 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 1, 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. Note that this brake operates via a friction clutch, and is more of a pack tension control than a brake.

The tension regulator 76 also has its engagement pin 76
'b moves upward in the elongated hole 1e on the main chassis 1, and is rotated counterclockwise, moving the tension post 76a to the outside of the cassette, and assumes 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 1b
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 the 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 toothless gear 24 has its toothless 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), an eject state is shown 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.

1. According to this embodiment, the case where the application is applied to an 8mm VTR has been described, but the invention is not limited to this, and can be applied to any device in which the tape winding angle tends to increase with the miniaturization of the head drum. can do.

(Effects of the Invention) As described above, according to the recording or reproducing apparatus of the present invention, by designing the tape running path as described above, the number of movable guide blocks can be reduced to one on the tape supply side, and the number of movable guide blocks can be reduced to one for tape winding. On the removal side, only two pieces are required, making it possible to achieve miniaturization and simplification of the mechanism, as well as to significantly reduce costs.

Furthermore, in the present invention, 1) The main inclined guide post on the supply side and the posts before and after it can be provided on the main chassis, and the inclination direction and wrap angle of the main inclined post on the supply side change with loading and unloading operations. It is easy to achieve the precision of a tape running system without any need for a tape running system.

2) Since the angle formed by the cross line on the tape exit side and the angle connecting the center of the reel is set small, a rotating guide post ( Guide roller 110 in Fig. 6)
is not required, the configuration can be simplified, and the load on tape running can be reduced.

3) The number of rotating guide rollers is the tension post 101
The number of tapes is 4, which is 2 fewer than the conventional example shown in Figure 6.The tape running system can be simplified, and the tape running system has no steep angles. The overall thickness can also be reduced.

4) According to the 8mm VTR former software, PCM
When the tape is wrapped around the head drum until it reaches the recording area (3
However, since the head drum is inclined (6 degrees) in the direction of the cassette, the tape at the exit of the drum is at a high position, which results in a disadvantage in the thickness direction due to the large amount of wrapping. It is advantageous in the opposite direction.

[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 the specific configuration 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 control 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... Ten line regulator 84... Reel lock lever 1,. ...Cross line 10 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...Recessed part on the front of the cassette

Claims (1)

[Claims] a plurality of guide means for pulling out a tape from a cassette and winding it from the entrance and exit sides of a rotary head drum to form a predetermined tape running path; and a capstan for transporting the tape on the tape exit side of the rotary head drum; The guide means for forming the tape running path on the tape entry side of the head drum has one movable guide member, and the guide means for forming the tape running path on the tape exit side of the rotary head drum has one movable guide member. A recording or reproducing device characterized in that it has a structure having two movable guide members between it and a capstan.