JPH08321095A - Reel brake mechanism and recording or reproducing device - Google Patents

Abstract

PURPOSE: To enable the space saving by a simple constitution and also to facilitate the adequate setting for the strength of brake force. CONSTITUTION: The mechanism is provided with a brake lever 30 capable of abutting/separating against a part 21 to be pressurized of a reel base 20, a spring 33 for pressing the brake lever to move in the abutting direction, an auxiliary lever 40 capable of abutting/separating against the brake lever 30, and a spring 43 for pressing the auxiliary lever to move in the abutting direction. The existence of the brake force is changed over in such a manner that the brake lever 30 is abutted or separated against the part 21 to be pressurized of the reel base 20, and when the auxiliary lever 40 is abutted on the brake lever 30 in the state the brake force is applied, the brake force becomes strong due to the combination of the spring 33 and the spring 43, and when the auxiliary lever 40 is separated from the brake lever 30, the brake force becomes weak due to the spring 33 only. The brake lever 30 and the auxiliary lever 40 are selectively controlled for turning by a mode lever 60 and an intermediate lever 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel brake mechanism for changing the braking force applied to a reel stand on which a reel is mounted in a VTR or the like according to different braking modes such as tape loading and forward / reverse running. And a recording or reproducing device such as a VTR equipped with this reel brake mechanism.

[0002]

2. Description of the Related Art Conventionally, in a VTR, as a reel brake mechanism for mechanically changing a braking force applied to a reel stand on which a reel is mounted, as shown in FIG. 6, for example, as shown in FIG. There is one in which at least two brake levers 102 and 103 that can come into contact with and separate from each other are provided, and the ends of springs 104 and 105 connected to these levers 102 and 103 are connected to a drive mechanism (not shown). In this case, each drive mechanism is controlled, and both levers 102 and 103 are controlled with respect to the reel base 101.
By applying pressure contact release and combining pressure contact release, the braking force to the reel base 101 and the strength of the braking force are obtained.

Further, as shown in FIG. 7, for example, an end of a spring 107 connected to a brake lever 106 that can be brought into contact with and separated from an outer peripheral surface 101a of a reel base 101 is connected to a control lever 108. In some systems, the control lever 108 is moved in the direction of the arrow g, and the braking force on the reel base 101 and the strength of the braking force are obtained by the movement amount h ₁ · h ₂ and the load change of the spring 107 accompanying the movement.

[0004]

However, in the conventional example as described above, a plurality of brake levers 102 are provided.
In the configuration of FIG. 6 which uses the and 103, a drive mechanism for pressing the levers 102 and 103 into and out of contact with the reel base 101 according to the braking mode is separately required. Further, since the shoe portions of both levers 102 and 103 are brought into contact with different positions on the outer peripheral surface 101a of the reel stand 101a in order to obtain the strength of the braking force, a large space is secured around the outer peripheral surface 101a of the reel stand 101. There was a need.

Further, the moving amount of the control lever 108 and the load of the spring 107 are adjusted in order to change the braking force.
In the above configuration, it is necessary to set the movement stroke of the control lever 108 and the spring force of the spring 107 with extremely high precision in order to obtain an appropriate strength of the braking force.

From the above, in the conventional reel brake mechanism, the number of parts is large and the mechanism is complicated, and a lot of space is taken around the outer peripheral surface of the reel stand. Also, it was extremely difficult to properly set the strength of the braking force. These make assembly and adjustment difficult,
There was a problem that the cost was significantly high.

Therefore, the present invention provides a reel brake mechanism which can save space with a simple structure and can easily set the strength of the braking force properly, and a recording or reproducing apparatus equipped with this reel brake mechanism. The purpose is to

[0008]

In order to achieve the above object, the present invention provides a reel brake mechanism for changing a braking force applied to a reel stand on which a reel is mounted according to a braking mode. And a first urging means for urging the brake lever to move in the contact direction. Further, the brake lever can contact and separate from the brake lever. It is characterized in that it is provided with a configured auxiliary lever and a second urging means for urging the auxiliary lever to move in the contact direction.

The reel brake mechanism further includes a control member that is movable between at least three positions to selectively control the operation of the brake lever and the auxiliary lever. The movement of the brake lever in the separating direction is restricted by the movement to the first position, and the movement restriction of the brake lever is released by the movement of the control member in the second position to the third position of the control member. The movement restriction of the brake lever is released and the movement of the auxiliary lever is restricted in the separating direction.

In the reel brake mechanism, the control member includes a mode lever configured to be movable between at least three positions and an intermediate lever whose movement is controlled by the mode lever. The movement of the brake lever and the intermediate lever is selectively controlled, and the movement of the intermediate lever controls the movement of the auxiliary lever.

Further, a recording or reproducing apparatus according to the present invention comprises the reel brake mechanism, a reel stand whose braking force is changed by the reel brake mechanism, a rotary drum having a recording or reproducing head, and a cassette. A tape loading unit for pulling out a tape, a first chassis in which at least the rotating drum is arranged, at least the reel stand and the reel brake mechanism are installed and slidable relative to the first chassis. A second chassis that is mounted on the reel stand of the second chassis, and then moves the second chassis in the direction of the rotary drum relative to the first chassis. Slide and slide the tape out of the cassette opening by the tape loading means. , Characterized by being configured to load a predetermined path including the tape drum circumferential surface with at least a portion is relatively inserted into an opening of the cassette of the rotary drum.

[0012]

In the present invention constructed as described above, the presence or absence of the braking force is switched by bringing the brake lever into contact with or away from the reel base. Since the lever can contact and separate, when the auxiliary lever contacts the brake lever while the brake lever applies the braking force,
A strong braking force is produced by the combination of the first urging means and the second urging means, and when the auxiliary lever is separated from the brake lever, a weak braking force is produced only by the first urging means. Therefore, the strength of the braking force can be changed with a simple structure, and since only the brake lever comes into contact with the reel stand, it is not necessary to secure a lot of space around the outer circumference of the reel stand. Moreover, since each of the brake lever and the auxiliary lever is provided with a dedicated biasing means, it is easy to properly set the strength of the braking force.

Further, the movement of the control member is used to regulate the movement of the brake lever in the separating direction, release the regulation of the movement of the brake lever, release the restriction of moving the brake lever and regulate the movement of the auxiliary lever in the separating direction. In such a case, the brake release state, the strong brake state, and the weak brake state can be selectively switched with a simple drive structure.

Further, when the control member is a mode lever and an intermediate lever, the movement of the mode lever selectively controls the movement of the brake lever and the intermediate lever, and the movement of the intermediate lever controls the movement of the auxiliary lever. Even if the movement stroke of the mode lever is set to a small amount necessary for controlling the brake lever, the auxiliary lever can be controlled via the intermediate lever. The degree of freedom of the arrangement position can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, the schematic configuration of the entire VTR in this embodiment will be described with reference to FIGS.

Reference numeral 1 is a main chassis which is a first chassis, 2 is a slide chassis which is a second chassis, and the slide chassis 2 is slidable on the main chassis 1. Reference numeral 3 denotes a rotary drum arranged on the main chassis 1 in a tilted manner, and has a magnetic head for recording or reproducing mounted thereon. Reference numeral 4 is a capstan protruding above the main chassis 1, 5 and 6 are tape guide members of tape loading means, and 7 and 8 are a pair of reel stands installed on the slide chassis 2. A cassette 9 stores a pair of reels 11 and 12 around which a magnetic tape 10 is wound.

In the VTR, as shown in FIG. 4, first, the cassette 9 is mounted on the slide chassis 2 and the reels 11 and 12 are fitted on the reel bases 7 and 8, and then the slide is performed. Chassis 2 is the main chassis 1
The tape 10 is pulled out from the opening 9a of the cassette 9 by the tape guide members 5 and 6 while being relatively slid toward the rotary drum 3. Finally, as shown in FIG. 5, at least a part of the rotary drum 3 is relatively inserted into the opening 9 a of the cassette 9, and the tape 10 is spirally wound around the peripheral surface of the rotary drum 3. It is loaded in a predetermined path including winding. In this state, the tape 10 is pressed against the capstan 4 by a pinch roller (not shown), the tape 10 is run, and desired recording or reproduction is performed by the head of the rotary drum 3.

Next, the reel brake mechanism installed on the slide chassis of the VTR will be described. FIG.
2 is a plan view showing a brake released state of the reel brake mechanism, FIG. 2 is a plan view showing its strong braking state, and FIG. 3 is a plan view showing its weak braking state.

1 to 3, 20 is a reel stand,
A cylindrical pressed portion 21 is provided on the outer circumference of the reel stand 20.

Reference numeral 30 is a brake lever, which is rotatable about a shaft 31 in the directions of arrows a and a '.
A tension coil spring 33, which is a first biasing means, is stretched between the spring locking portion 30a of the brake lever 30 and the spring locking portion 32 on the chassis (the slide chassis 2), for example. As a result, the brake lever 30 is urged to rotate in the direction of arrow a, which contacts the pressed portion 21 of the reel base 20. Reference numeral 34 is a friction member attached to the arcuate arm portion of the brake lever 30 and is made of, for example, felt.

Reference numeral 40 denotes an auxiliary lever, which is rotatable about an axis 41 in the directions of arrows b and b '. A tension coil spring 43, which is a second biasing means, is stretched between the spring locking portion 40a of the auxiliary lever 40 and the spring locking portion 42 on the chassis, for example. As a result, the auxiliary lever 40 is urged to rotate in the direction of arrow b, which contacts the brake lever 30. The 40c portion of the auxiliary lever 40 can abut against the 30c portion of the brake lever 30, and the abutment restricts the rotation in the arrow b direction.

Reference numeral 50 denotes an intermediate lever, which is rotatable about a shaft 51 in the directions of arrows c and c '. Between the spring locking portion 50a of the intermediate lever 50 and the spring locking portion 52 on the chassis, for example, a shaft 51 is provided as a third biasing means.
Both ends of the torsion coil spring 53 wound around are locked. As a result, the intermediate lever 50 is urged to rotate in the direction of the arrow c, which contacts the auxiliary lever 40. It is assumed that the intermediate lever 50 has its 50b portion abuttable with the 40b portion of the auxiliary lever 40, and the intermediate lever 50 is restricted from rotating in the arrow c direction by the stopper 54 or the like on the chassis.

As described above, the auxiliary lever 40 and the intermediate lever 50 can contact each other at their 40b and 50b portions, but the turning directions b and c by the respective springs 43 and 53 are regarded as the turning force. Then, the spring force of the spring 43 and the spring 53 is set so that the turning power is b <c.

Reference numeral 60 denotes a mode lever, which is constructed so as to be movable in the vertical direction (arrows d and d ') in the figure by a mode switching mechanism (not shown). In this embodiment, for example, reproduction (or recording) and stop (stop). Or rewinding), loading, etc., and stopped at three positions corresponding to each mode. Pins 60b and 60c are attached to the mode lever 60, and the pins 60b and 60c are selectively brought into contact with the 30b portion of the brake lever 30 and the 50c portion of the intermediate lever 50 according to the position of the mode lever 60, respectively. Lever 3
The 0 and intermediate levers 50 are restricted from rotating in the directions of arrows a'and c ', respectively.

In the above structure, assuming that the reel stand 20 represents the take-up reel stand (corresponding to the reel stand 8 in FIGS. 4 and 5), the mode lever 60 in FIG. 1 moves in the direction of arrow d '. It has been moved to the first position P ₁ and is in the playback (or recording) mode.

Pins 60b and 60c of the mode lever 60
The brake lever 30 and the intermediate lever 5
No. 50c portion of 0 is pressed, and the brake lever 30
Also, the intermediate lever 50 is restricted from rotating in the directions of the arrows a ′ and c ′ against the springs 33 and 53. In addition, the 30c portion of the brake lever 30 allows 40c of the auxiliary lever 40.
The portion is pressed, and the auxiliary lever 40 is rotated in the direction of the arrow b ′ against the spring 43. As a result, the friction member 34 of the brake lever 30 is separated from the pressed portion 21 of the reel base 20, and the reel base 20 is released from the brake.

In this state, a rotational force is transmitted to the reel base 20 by an idler gear or the like (not shown) of the reel base drive mechanism, the reel base 20 is rotationally driven in the direction of arrow e, and the reel mounted on the reel base 20. The tape (corresponding to the reel 12 and the tape 10 in FIGS. 4 and 5) is wound.

Next, as shown in FIG. 2, the mode lever 6
0 is moved in the direction of arrow d and stopped at the second position P ₂ to enter the stop (or rewind) mode.

Here, the pin 60b of the mode lever 60 does not come into contact with the portion 30b of the brake lever 30, the brake lever 30 is released from the regulation of rotation, and the spring 33 causes the arrow a to move.
The friction member 34 is pressed against the pressed portion 21 of the reel base 20 by being urged to rotate in the direction. Accordingly, the brake lever 30 can secure the load (braking force) f ₁ on the reel base 20 by the load of the spring 33.

On the other hand, the pin 60c of the mode lever 60 is in contact with the portion 50c of the intermediate lever 50, and the intermediate lever 5
0 is regulated to rotate in the direction of arrow c'against the spring 53 so that the 50b portion of the intermediate lever 50 and the 40b portion of the auxiliary lever 40 do not come into contact with each other. As a result, the auxiliary lever 40 is urged to rotate in the direction of arrow b by the spring 43, the 40c portion of the auxiliary lever 40 abuts the 30c portion of the brake lever 30, and the load (brake force) f _{2 on the} brake lever 30. Can be given.

As a result, in the stop (or rewind) mode, a total F of f ₁ + f ₂ (brake force) can be applied to the reel stand 20. Therefore, the strong braking force surely stops the reel base 20 in the stop mode, and brakes the rotation of the reel base 20 in the arrow e'direction in the rewinding mode to give a strong back tension to the tape.

Next, FIG. 3 shows a state in which the tape is being loaded, and the mode lever 60 is moved in the arrow d direction to the third position P ₃ .

Pins 60b and 60c of the mode lever 60
Are set so as not to contact the 30b portion of the brake lever 30 and the 50c portion of the intermediate lever 50, respectively. As a result, the brake lever 30 is moved by the spring 33 to the arrow a.
The intermediate lever 50 is rotationally biased in the direction of arrow c by the spring 53. Here, the intermediate lever 50
Since the rotational urging force of the auxiliary lever 40 is larger than the rotational urging force of the auxiliary lever 40, the intermediate lever 50 has a portion 50b.
0b of the auxiliary lever 40 is pressed against the spring 43 in the direction of the arrow b ', and the 40c portion of the auxiliary lever 40 is separated from the 30c portion of the brake lever 30.

Therefore, in this state, the brake lever 3
Only the load (brake force) f ₁ by the spring 33 of 0 is applied to the reel stand 20. Due to this weak braking force, the rotation of the reel stand 20 in the direction of the arrow e ′ is lightly braked during loading, and an appropriate back tension is given to the tape.

As described above, according to this reel brake mechanism, the auxiliary lever 40 can further come into contact with and separate from the brake lever 30 which can come into contact with and separate from the reel stand 20, so that the structure is extremely simple. The strength of the braking force can be reliably changed. And reel stand 2
Since only the friction member 34 of one brake lever 30 is in contact with the pressed portion 21 of 0, the structure in which a plurality of friction members are brought into contact with the pressed portion 21 of the reel base 20 is not provided outside the reel base 20. There is no need to secure a lot of space around. Moreover, the brake lever 30 and the auxiliary lever 40
Since each of them has a dedicated spring 33 and 43, unlike the structure in which the braking force is adjusted by changing the load of the spring, it is extremely easy to appropriately set the strength of the braking force.

The mode lever 60 and the intermediate lever 50 described above constitute a control member according to the present invention. The movement of such a control member regulates the rotation of the brake lever 30 in the separating direction. Since the release of the rotation restriction of the brake lever 30, the release of the rotation restriction of the brake lever 30, and the rotation restriction of the auxiliary lever 40 in the separating direction are selectively performed, a very simple drive structure is provided. It is possible to selectively switch between the brake release state, the strong brake state and the weak brake state.

It is also possible to control the rotation of the brake lever 30 and the auxiliary lever 40 by using the control member as one member. In particular, in this embodiment, the control member is the mode lever 60 and the intermediate lever 50. By moving the mode lever 60, the brake lever 30 and the intermediate lever 50
Are selectively controlled to rotate, and the rotation of the intermediate lever 50 controls the rotation of the auxiliary lever 40. This allows
The movement stroke of the mode lever 60 is the brake lever 3
Even if the amount is small enough to control 0, the intermediate lever 50
Since it is possible to control the auxiliary lever 40 via the, it is possible to improve the degree of freedom in the shapes and arrangement positions of the brake lever 30 and the auxiliary lever 40. For example, as in the embodiment, a configuration is possible in which the tip 40c portion of the auxiliary lever 40 is brought into contact with the tip 30c portion of the brake lever 30, and the auxiliary lever 40 efficiently applies the braking force.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various effective modifications and applications are possible based on the technical idea of the present invention. For example, in the present embodiment, one auxiliary lever can be brought into and out of contact with the brake lever to switch the braking force in two steps. However, a plurality of auxiliary levers and second urging means are provided to provide the braking force. It is also possible to switch to three or more stages. The first and second urging means in the present invention and the third urging means in this embodiment are not limited to springs, and may be various elastic members such as rubber parts or elastic pieces integrated with a lever. In addition, V of this embodiment
In TR, a configuration is shown in which a slide chassis on which a reel stand and a reel brake mechanism are installed is slid with respect to the main chassis. However, in general, the reel stand and the reel brake mechanism are provided on a fixed chassis together with a rotating drum and the like. It may be a recording or reproducing device.

[0039]

As described above, according to the present invention,
In the reel brake mechanism that changes the braking force applied to the reel stand according to the braking mode, the auxiliary lever can be brought into contact with and separated from the brake lever that can come into contact with and separate from the reel stand, and each lever is dedicated. By having the urging means, it is possible to reliably change the strength of the braking force without using a plurality of brake levers, a plurality of drive mechanisms that individually operate each, or a control lever that adjusts the spring force of the brake lever. Can be made. Therefore, it is possible to realize a simple mechanism with a small number of parts, save a lot of space around the outer periphery of the reel stand, and set a proper braking force strength by the dedicated biasing means of each lever. Can be done very easily. As a result, assembly and adjustment can be performed very easily, and the cost can be significantly reduced.

Further, according to the recording or reproducing apparatus of the present invention, in the system in which the second chassis in which the cassette is mounted slides with respect to the first chassis, the reel brake mechanism installed on the second chassis. Since it can be made compact and does not take up a lot of space around the outside of the reel stand, that space can be effectively used for arranging the tape loading means, the reel stand drive mechanism, etc., and thus the entire recording or reproducing apparatus. Can be made smaller and thinner.

[Brief description of drawings]

FIG. 1 is a plan view showing a brake released state of a reel brake mechanism according to an embodiment of the present invention.

FIG. 2 is a plan view showing a strong braking state of the reel brake mechanism.

FIG. 3 is a plan view showing a weak braking state of the reel brake mechanism.

FIG. 4 is a schematic plan view showing an unloading state of a VTR according to an embodiment of the present invention.

FIG. 5 is a schematic plan view showing a loading completed state of the VTR.

FIG. 6 is a schematic plan view of a conventional reel brake mechanism.

FIG. 7 is a schematic plan view of another conventional reel brake mechanism.

[Explanation of symbols]

 1 Main Chassis (1st Chassis) 2 Sliding Chassis (2nd Chassis) 3 Rotating Drum 5 and 6 Tape Guide Member 7 and 8 Reel Stand 9 Cassette 9a Opening 10 Magnetic Tape 11 and 12 Reel 20 Reel Stand 21 Pressed Part 30 Brake lever 33 Spring (first urging means) 34 Friction member 40 Auxiliary lever 43 Spring (second urging means) 50 Intermediate lever 53 Spring (third urging means) 60 Mode lever

Claims (4)

[Claims] 1. A reel brake mechanism configured to change a braking force applied to a reel base on which a reel is mounted according to a braking mode, and a brake lever configured to be capable of coming into contact with and separating from the reel base, and the brake. A first biasing means for moving and biasing the lever in the abutting direction, and further, an auxiliary lever configured to be able to abut and separate from the brake lever, and the auxiliary lever is moved in the abutting direction. A reel brake mechanism comprising: a second urging means for urging. 2. The reel brake mechanism according to claim 1, further comprising a control member configured to be movable between at least three positions to selectively control the operation of the brake lever and the auxiliary lever, The movement of the control member to the first position restricts the movement of the brake lever in the separating direction, and the control member moves to the second position.
The movement restriction of the brake lever is released by moving the brake lever to the position, the movement restriction of the brake lever is released by the movement of the control member to the third position, and the movement of the auxiliary lever is restricted in the separating direction. A reel brake mechanism having the above structure. 3. The reel brake mechanism according to claim 2, wherein the control member includes a mode lever configured to be movable between at least three positions, and an intermediate lever whose movement is controlled by the mode lever, A reel brake mechanism, wherein the brake lever and the intermediate lever are selectively moved and controlled by the movement of the mode lever, and the auxiliary lever is also controlled by the movement of the intermediate lever. . 4. A reel brake mechanism according to claim 1, a reel stand whose braking force is changed by the reel brake mechanism, a rotary drum having a recording or reproducing head, and a cassette. A tape loading unit for pulling out a tape, a first chassis in which at least the rotating drum is arranged, at least the reel stand and the reel brake mechanism are installed and slidable relative to the first chassis. The second done
And mounting the cassette on the reel stand of the second chassis, sliding the second chassis relative to the first chassis in the direction of the rotary drum, and The tape loading unit pulls out the tape from the opening of the cassette, relatively inserts at least a part of the rotary drum into the opening of the cassette, and loads the tape on a predetermined path including the drum peripheral surface. A recording or reproducing apparatus having the above structure.