JPH11134739A - Reel base device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reel base device, that the proper operation is guaranteed by compactly constituting without requiring the arranging space. SOLUTION: The device is composed of a pair of reel bases 8 for placing a pair of reels thereon, gears 8b having plural teeth and receiving the driving force for rotating the reel bases 8 from the outside respectively provided on a pair of reel bases 8, a 1st brake member 13 having a shoe 13b formed with a resin capable of bringing into contact with tips 8a of the plural teeth of the gear 8b arranged on one side of a pair of reel bases 8, and an energizing member 16 for energizing the shoe 13b of the 1st brake member 13 in the direction abutting on the plural teeth. The radius of curvature of the shoe 13b is formed to be larger than the radius to tooth tip of the gear 8b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording or reproducing apparatus such as a video tape recorder (VTR) and, more particularly, to a reel brake device of a reel base for pulling out a tape from a cassette and performing forward and reverse running.

[0002]

2. Description of the Related Art A conventional reel brake device is shown in FIG.
As shown in FIG.
The end of the spring 103 is connected to the drive mechanism 104, and the drive mechanism is operated, whereby the brake lever 105
, Or a braking force on the reel base 101 is obtained. To do this, as shown in FIGS. 9A and 9B, the brake press contact portion 10 is attached to the outer peripheral cylindrical portion of the reel base 101.
2 is provided.

[0003] Further, although different from the mechanism to which the present invention is applied, the following mechanism is known as a similar mechanism. According to the configuration shown in FIG. 10, the shoe tip 1 in which the gear tooth tip 109 of the reel base 101 is used as a brake pressure contact part and the brake 105 is attached with felt or synthetic leather or the like.
10 is in direct contact.

[0004]

However, in the conventional example shown in FIG. 9, it is necessary to provide the brake pressure contact portion 102 for obtaining the braking force on the outer peripheral cylindrical portion of the reel base 101. For this reason, the reel base 101 itself must be bulky. Further, the structure as shown in FIG. 10 employs easily deformable felt or synthetic leather in order to obtain a stopping torque for the reel base 101 so as to function as a lock brake. It is not intended to be a function to gain.

[0005] It is an object of the present invention to provide a reel stand device which is compact and does not take up any space for arrangement, and which guarantees proper operation.

[0006]

A reel base device according to the present invention has a pair of reel bases on which a pair of reels are mounted, and a plurality of teeth provided on each of the pair of reel bases. A first gear having a gear that receives a driving force for rotating the table from the outside and a shoe formed of a resin that can contact a tip of a plurality of teeth of the gear provided on one of the pair of reel stands; A brake member; and a biasing member that biases the shoe of the first brake member in a direction in which the shoe comes into contact with the plurality of teeth.

Further, in the reel stand device according to the present invention, the radius of curvature of the shoe is larger than the radius of the addendum circle of the gear. Further, in the reel base device of the present invention, the first brake member is configured to lock between a plurality of teeth of the gear when the first brake member rotates against the urging force of the urging member. It is characterized by having.
Further, in the reel base device of the present invention, the first brake member is characterized in that the shoe and the lock portion are formed by integral molding. Further, in the reel base device of the present invention, the reel base apparatus further includes a second brake member having a lock portion that engages between teeth of the plurality of teeth of the gear provided on the other of the pair of reel bases. And Further, in the reel base device of the present invention,
When the lock portion of the second brake member is engaged with the gear of the other reel base, the shoe of the first brake member contacts the tooth tip of the gear of the one reel base. Features. Further, in the reel base device according to the present invention, the shoe comes into contact with the tooth tip of the gear when the tape is pulled out from the reel.

[0008] Further, a reel base device according to the present invention has a pair of reel bases on which a pair of reels are mounted, and has a plurality of teeth provided on the pair of reel bases, respectively, and rotates the reel base. A gear that receives a driving force from outside, a shoe that can contact the tips of a plurality of teeth of the gear provided on one of the pair of reel stands, and the shoe moves in a direction away from the tip. A first brake member having a lock portion engaged between the teeth of the plurality of teeth, and a biasing member for biasing a shoe of the first brake member in a direction in which the shoe comes into contact with the plurality of teeth And

Further, in the reel stand device according to the present invention, the radius of curvature of the shoe is larger than the radius of the addendum circle of the gear. Further, in the reel base device of the present invention, the first brake member is characterized in that the shoe and the lock portion are formed by integral molding. Further, in the reel base device of the present invention, the reel base apparatus further includes a second brake member having a lock portion engaged between teeth of the plurality of teeth of the gear provided on the other of the pair of reel bases. And Further, in the reel stand device of the present invention, when the lock portion of the second brake member is engaged with the gear of the other reel stand,
The shoe of the first brake member is in contact with the tooth tip of the gear of the one reel base. Further, in the reel base device according to the present invention, the shoe comes into contact with the tooth tip of the gear when the tape is pulled out from the reel.

A recording or reproducing apparatus according to the present invention is provided with a rotary drum device having a head for recording or reproducing information on or from a tape, and a cassette for accommodating the tape. A cassette mounting member that supports the drum device so as to be able to advance and retreat, any one of the reel base devices arranged in the cassette mounting portion of the cassette mounting member, and the tape is pulled out of the cassette, and the tape is removed. A tape guide member adapted to run along a predetermined tape path.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a reel base device according to the present invention will be described below with reference to the drawings. Figure 1
FIG. 4 is a drawing that best illustrates the features of the present invention.
2 and FIG. 2 are a plan view and a partial plan view of a reel base device provided with a reel brake mechanism according to the present invention, showing a state where a brake is applied. FIG. 3 is a side view, and FIG. 4 is a view showing a mechanism for operating a brake mechanism. FIG. 5 is a diagram showing the state of the brake in each operation mode.

First, a schematic configuration of the entire VTR device according to the present embodiment will be described with reference to FIGS.
In the figure, 1 is a main chassis, 2 is a slide chassis (cassette mounting member), which is slidable on the main chassis 1. 3 is the main chassis 1
The rotary drum 4 is disposed on the main chassis 1 and the capstans 5 and 6 are tape guide members of tape loading means. It is a reel stand. Reference numeral 9 denotes a cassette, which accommodates a pair of reels 11 and 12 around which a magnetic tape 10 is wound.

In the operation of the VTR device, first, FIG.
As shown in (1), the cassette 9 is mounted on the slide chassis 2, and the reels 11, 12 are fitted to the reel bases 7, 8. Thereafter, the slide chassis 2 is slid relative to the main chassis 1 in the direction of the rotating drum 3, and the tape 10 is pulled out from the opening 9 a of the cassette 9 by the tape guide members 5 and 6.

Finally, as shown in FIG. 7, at least a part of the rotating drum 3 relatively enters into the opening 9a of the cassette 9, and the tape 10 has a spiral shape on the peripheral surface of the rotating drum 3. It is loaded on a predetermined path including winding. In this state, the tape 10 is pressed against the capstan 4 by a pinch roller (not shown). As the tape 10 runs, desired recording or reproduction is performed by the head of the rotating drum 3.

Here, during the loading from FIG. 6 to FIG. 7, for example, in the present embodiment, although not shown, the supply side reel base 7 has a mechanism (not shown) similar to the lock claw portion 13d shown in FIG. Brake member). Therefore, the tape 10 pulled out by the tape guide members 5 and 6 is pulled out from the take-up reel base 8. At this time, in order to pull out the tape 10 stably, it is necessary to apply a stable braking force to the reel base 8 by a brake and apply a stable back tension to the tape 10.

Now, the reel brake mechanism installed on the slide chassis of the VTR will be described.
Here, in FIGS. 1 to 4, in FIG.
Are arranged on the slide chassis 2 as described above. The brake lever 13 (first brake member) is integrally formed of a synthetic resin material, and is fitted to a shaft 14 planted on the slide chassis 2.
4 is freely rotatable. Brake lever 13
Is made of polyoxymethylene (PO
It is preferred to use M). Spring hook 15 on slide chassis 2 and spring hook 13a of brake lever 13
A spring 16, which is an urging member for urging the brake shoe portion 13 b of the brake lever 13 in the direction of bringing the brake shoe portion 13 b into contact with the tooth tip portion 8 a of the reel base 8, is mounted. Accordingly, the brake lever 13 receives a rotational force in the counterclockwise direction indicated by the arrow A in the figure around the shaft 14 by the spring 16,
As a result, the brake shoe portion 13b is pressed against the tooth tip 8a of the reel base 8.

FIG. 3 shows a side view of the brake mechanism. Operating shaft 13c which is a part of brake lever 13
Is inserted through the hole of the slide chassis 2
Projecting to the lower surface of the. The operation shaft portion 13c protruding from the lower surface of the slide chassis 2 is operated by a cam portion 18d (FIG. 4) of the mode lever 18 as described later, so that the brake lever 13 performs a predetermined rotation operation.

FIG. 4 shows an operation mechanism for the brake mechanism. The cam gear 17 operates according to each operation mode by a loading motor (not shown) and a gear train (not shown) installed on the main chassis 1. I do. Mode lever 1
Reference numeral 8 denotes a shaft portion 18a fitted in the cam groove 17a of the cam gear 17. Furthermore, the shafts 19 and 20 on the main chassis 1 are fitted with the elongated holes 18b and 18c,
In accordance with the operation of the cam gear 17, it is movable in the direction of arrow B in the figure. The operation shaft 13c of the brake 13 is actuated by the cam 18d in response to the operation of the mode lever 18.
Is operated, the brake lever 13 is driven.

For example, the state shown in FIG. 4 is in the middle of loading, and is in the same arrangement state as in FIG.
After that, the movement of the operation lever 13 c by the movement of the mode lever 18.
Comes to the cam position 18e, the state shown in FIG. This is, for example, a state of reverse running (Rev. running). At this time, the lock claw portion 13d of the brake 13 meshes with the friction rotating gear portion 8b of the reel base 8, and the gear portion 8b
To lock. Since the reel base 8 is rotated in a counterclockwise direction indicated by an arrow in the figure by a tape, braking is applied by friction torque of the friction material 8c. This friction torque is the back tension of the tape 10 during reverse running.

Further, when the operation shaft portion 13c comes to the cam position 18f due to the movement of the mode lever 18, FIG.
The state shown in FIG. This is, for example, the forward direction (Play
Running), and the brake lever 13 is moved to the gear portion 8b.
Is not engaged at all. At this time, the reel base 8 is rotated clockwise in the figure by a gear train (not shown) from the capstan 4 to wind the tape 10 in the forward direction.

As described above, in order to apply a stable back tension during loading, the brake shoe portion 13b of the brake 13 is brought into contact with the tip 8a of the gear portion 8b against the reel base 8. At this time, the second brake member on the supply-side reel base 7 engages with the gear portion of the reel base 7.

Here, specific numerical examples and the like in this embodiment will be shown. As shown in detail in FIG. 2, the diameter of the addendum circle of the gear portion 8b of the reel base 8 is φ17.2 mm, so the radius R is 8.6 mm. In contrast, brake lever 1
3 has a radius of curvature r of 11.0.
mm. Further, the brake shoe portion 13b has a length L equal to or greater than one pitch P (two teeth) of the teeth of the gear portion 8b. As is clear from FIG. 2, in the present embodiment, the brake shoe portion 13b is in contact with the three gear portions 8b, but the brake shoe portion 13b is formed of resin, so that the brake shoe portion 13b Can smoothly come into contact with the tooth tip 8a. Further, by making the radius of curvature of the brake shoe portion 13b larger than the radius of the addendum circle of the gear portion 8b, the contact at the start of the contact does not increase and the contact is smooth.

As described above, according to the present embodiment, in the reel base of the VTR for pulling out the tape or running in the forward / reverse direction, the tape is formed with a curvature larger than the tooth circle of the reel gear relative to the gear tooth tip of the reel gear. By contacting and separating the reel brake with the brake shoe, and obtaining the braking force on the reel base,
A stable braking force can be obtained when the tape is pulled out, and the space at the outer periphery of the reel base can be effectively used. Furthermore, the space in the height direction of the reel base is not particularly required. In addition, since the number of parts is small and it can be realized by a simple mechanism, there are advantages such as easy assembly and realization of substantial cost reduction.

[0024]

As described above, according to the present invention, in this kind of recording or reproducing apparatus, it is possible to realize a reel stand apparatus which is compactly constructed without taking up an arrangement space and which guarantees proper operation. .

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a state where a reel brake is applied in a loading state according to an embodiment of the present invention.

FIG. 2 is a detailed view of a brake shoe unit of FIG.

FIG. 3 is a side sectional view according to the embodiment of the present invention.

FIG. 4 is a diagram showing a mechanism for operating a brake according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a forward direction state and a reverse traveling state where no brake is applied in the embodiment of the present invention.

FIG. 6 is a schematic plan view showing an unloaded state of the VTR according to the embodiment of the present invention.

FIG. 7 is a schematic plan view showing a completed loading state of the VTR according to the embodiment of the present invention.

FIG. 8 is a plan view showing a conventional reel brake mechanism.

FIG. 9 is a side view of a conventional reel brake mechanism.

FIG. 10 is a detailed view of a brake shoe portion of a conventional reel brake mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main chassis 2 Slide chassis 3 Rotating drum 4 Capstan 5 Tape guide member 6 Tape guide member 7 Reel stand 8 Reel stand 9 Cassette 10 Tape 11 Reel 12 Reel 13 Brake lever 13a Spring hook part 13b Brake shoe part 13c Operating shaft part 14 Shaft 15 Spring hook 16 Spring 17 Cam gear 17a Cam groove 18 Mode lever 18a Shaft 18b, 18c Slot 18d, 18e, 18f Cam 19 Shaft 20 Shaft

Claims (14)

[Claims] 1. A pair of reel bases on which a pair of reels are mounted; and a plurality of teeth provided on each of the pair of reel bases, and having a plurality of teeth and receiving a driving force for rotating the reel bases from outside. A first brake member having a gear, a shoe formed of a resin provided on one of the pair of reel bases and capable of contacting the tips of a plurality of teeth of the gear, and a shoe of the first brake member; And a biasing member for biasing the plurality of teeth in a direction to contact the plurality of teeth. 2. The reel base device according to claim 1, wherein a radius of curvature of the shoe is larger than a radius of a tip circle of the gear. 3. The device according to claim 2, wherein the first brake member has a lock portion that engages between the teeth of the plurality of gears when the first brake member rotates against the urging force of the urging member. The reel stand device according to claim 1. 4. The reel stand device according to claim 3, wherein the first brake member is formed by integrally molding the shoe and the lock portion. 5. The apparatus according to claim 1, further comprising a second brake member having a lock portion engaged between teeth of the plurality of teeth of the gear provided on the other of the pair of reel stands. 4. A reel base device according to item 1. 6. When the lock portion of the second brake member is engaged with a gear of the other reel base, the first brake member is turned off.
6. The reel base apparatus according to claim 5, wherein the shoe of the brake member abuts on the tooth tip of the gear of the one reel base. 7. The reel base device according to claim 1, wherein the shoe comes into contact with the tooth tip of the gear when the tape is pulled out from the reel. 8. A pair of reel bases on which a pair of reels are mounted; and a plurality of teeth provided on the pair of reel bases, respectively, and having a plurality of teeth and receiving a driving force for rotating the reel bases from outside. A gear, a shoe provided on one of the pair of reel bases, the shoe being capable of contacting a tip of a plurality of teeth of the gear; and the shoe being moved when the shoe moves away from the tip. A first brake member having a lock portion engaged between the teeth; and a biasing member for biasing a shoe of the first brake member in a direction in which the shoe comes into contact with the plurality of teeth. Reel stand device. 9. The reel base device according to claim 8, wherein a radius of curvature of the shoe is larger than a radius of a tip circle of the gear. 10. The reel base device according to claim 8, wherein the first brake member has the shoe and the lock portion formed by integral molding. 11. The apparatus according to claim 8, further comprising a second brake member having a lock portion engaged between teeth of the plurality of gears provided on the other of the pair of reel stands. 4. A reel base device according to item 1. 12. When the lock portion of the second brake member is engaged with the gear of the other reel base, the shoe of the first brake member moves to the tip of the gear of the one reel base. The reel stand device according to claim 11, wherein the reel stand device is in contact with the reel stand device. 13. The reel stand device according to claim 8, wherein the shoe comes into contact with the tooth tip of the gear when the tape is pulled out from the reel. 14. A rotary drum device having a head for recording or reproducing information on or from a tape, and a cassette for accommodating the tape is mounted, and the cassette is supported so as to be able to advance and retreat with respect to the rotary drum device. A cassette mounting member to be mounted; a reel base device according to any one of claims 1 to 13 arranged at a cassette mounting portion of the cassette mounting member; and pulling out the tape from the cassette, and setting the tape to a predetermined tape. A recording or reproducing apparatus, comprising: a tape guide member configured to run along a path.