JPH10241233A - Brake mechanism for reel base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely turnably support a brake arm on a reel base supporting member. SOLUTION: When large and small tape cassettes L and S having their respectively different reel-to-reel distances are selectively loaded, one pair of reel base supporting members 3A and 3B supporting freely rotatably one pair of reel bases 2A and 2B are moved to a loading position of each selected tape cassette to meet the reel-to-reel distance corresponding to this tape cassette, and are also worked to support freely turnably one pair of brake arms 7A and 7B having one pair of brake shoes 6A and 6B and spring-energized on one pair of reel base supporting members 3A and 3B. In addition, the mechanism is equipped with brake releasing members 10A and 10B having plural arm engaging parts 10a1 and 10a2 and then 10b1 and 10b2 corresponding to the loading positions of the large and small tape cassettes L and S respectively for the purpose of releasing the reel bases from brakes by abutting the arm engaging parts corresponding to the selected tape cassette in its loading position to the brake arms 7A and 7B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus which can selectively mount a plurality of types of tape cassettes having different reel-to-reel distances. The present invention relates to a brake mechanism of a reel base including a brake release member that releases braking at a cassette mounting position.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus such as a video tape recorder (VTR), a large tape cassette accommodating a pair of large reels having a large winding amount of a magnetic tape and a small tape cassette having a small winding amount of a magnetic tape. In some cases, a small tape cassette containing reels is used. Since the large-sized tape cassette and the small-sized tape cassette have different sizes of stored reels, the distance between the pair of reels is naturally different. The former large tape cassette is used for a stationary VTR, while the latter small tape cassette is used for a portable camera-integrated VTR.
Although they are used for (video movies), stationary VTRs that can share large and small tape cassettes are already on the market.

FIG. 4 is a plan view for explaining a reel base brake mechanism in a conventional tape player which can share a large and small tape cassette.

The reel base brake mechanism in the conventional tape player shown in FIG. 4 is disclosed in Japanese Patent Application Laid-Open No. 6-36395, and will be briefly described here.

[0005] The reel base brake mechanism in the conventional tape player shown in FIG. 4 applies brakes to two reel bases whose positions are changed according to the size of the tape cassette to be used and releases the brakes. Even if it comes to the position, it can be performed by one brake plate.

That is, the mechanical chassis 10 of the tape player
1, a pair of reel base blocks 103A, 103 rotatably supporting a pair of reel bases 102A, 102B.
B are two sets of guide shafts (1
04a, 104b) and (105a, 105b) so that they can reciprocate.

Further, a pair of reel base blocks 103A,
Two sets of guide shafts (104a, 104
b) and (105a, 105b) are mechanical chassis 101
The upper portions are provided in a “C” shape facing each other. Thereby, the pair of reel base blocks 103A and 103B are connected to the guide shafts (104a, 104b), (105a, 105).
When moving forward in (b), it reaches the mounting position of the small tape cassette (not shown), and when it moves backward, it reaches the mounting position of the large tape cassette (not shown). Therefore, it was supported on a pair of reel base blocks 103A and 103B. The distance between the pair of reel stands 102A and 102B can be adjusted to the distance between the reels of the pair of reels stored in the small tape cassette or the large tape cassette, respectively.

The brake plate 107 is provided with a brake shoe 106 which comes into contact with and separates from the pair of reel bases 102A and 102B.
Pressing portions 107a and 107b to which A and B are attached are formed in a “C” shape toward the pair of reel stands 102A and 102B, and are provided movably in the front-rear direction while being urged by a tension spring. .

The brake plate 107 is provided on the rotating arm 10.
9 and connected to the electromagnetic plunger 110. When the electromagnetic plunger 110 is operated, the brake plate 107 is moved in the direction opposite to the brake applying direction against the urging force of the tension spring 108, so that the brake plate 107 Brake shoe 1 attached to pressure contact parts 107a, 107b
06A and 106B are replaced with a pair of reel bases 102A and 102B.
, The brake application to the pair of reel stands 102A and 102B is released.

[0010]

By the way, in the above-mentioned conventional reel base brake mechanism in the tape player, the brake application to the two reel bases 102A and 102B and the release thereof are performed in any position of the reel bases 102A and 102B. Although it can be performed by one brake plate 107 and has a simple structure, it has the following problems.

That is, the pressure contact portion 107 of the brake plate 107
a, brake shoes 106A, 1 attached to 107b
06B comes into contact with the pair of reel bases 102A and 102B in the tangential direction, so that it becomes slippery, causing a problem that the braking force on the pair of reel bases 102A and 102B is weakened.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a structure in which a pair of reels housed in a plurality of types of tape cassettes have different reel-to-reel distances. A pair of reel bases to be attached to the
A pair of reel base supporting members that rotatably support the pair of reel bases and move the pair of reel bases to a mounting position of each tape cassette in accordance with a distance between reels corresponding to each tape cassette; A pair of brake arms rotatably supported by a pair of reel base support members, and a pair of brake arms for attaching the pair of brake shoes and braking the pair of reel bases via spring force, and near the reel base support member A plurality of arm engaging portions are provided so as to be freely connected to and separated from the brake arm in connection with a drive source, and correspond to the mounting positions of the plurality of types of tape cassettes. A brake releasing member for releasing the braking on the reel base by bringing an arm engaging portion corresponding to the tape cassette into contact with the brake arm. It is to provide a reel stand brake mechanism.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a brake mechanism for a reel base according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a plan view for explaining the configuration of a brake mechanism for a reel base according to the present invention. FIG. 2 is a perspective view of the brake mechanism for a reel base according to the present invention when the large tape cassette is mounted. FIG. 3 is a plan view for explaining the operation of releasing the braking, and FIG. 3 is a plan view for explaining the operation of releasing the braking on the reel base when the small tape cassette is mounted in the brake mechanism of the reel base according to the present invention. It is.

The brake mechanism for a reel base according to the present invention is applied to a magnetic recording / reproducing apparatus such as a video tape recorder which can selectively mount a plurality of types of tape cassettes having different reel-to-reel distances.

As shown in FIG. 1, a pair of reel support members 3A, 3B rotatably supporting a pair of reel mounts 2A, 2B are provided on a mechanical chassis 1 of the video tape recorder.
However, two sets of guide shafts (4
a, 4b) and (5a, 5b), respectively, so that they can reciprocate. The reel stand 2A and the reel stand supporting member 3A on the left correspond to the supply reel side in the large tape cassette L or the small tape cassette S, and the reel stand 2B and the reel stand supporting member 3B on the right correspond to the take-up reel. It corresponds to

Further, a pair of reel support members 3A, 3B
Guide shafts (4a, 4b), (5a, 5)
In b), one of the guide shafts 4a and 5a is provided for mere guidance, and the other guide shafts 4b and 5b are provided for driving by using a screw rod.
The upper portions are provided in a “C” shape facing each other. Thus, when the pair of reel support members 3A and 3B move forward in the drawing of the guide shafts (4a, 4b) and (5a and 5b), they reach the mounting position of the small tape cassette S and move rearward. Since the robot reaches the mounting position of the large tape cassette L, the distance between the pair of reel stands 2A and 2B supported on the pair of reel stand supporting members 3A and 3B is stored in the small tape cassette S or the large tape cassette L, respectively. The distance between the reels of a pair of reels (not shown) can be adjusted.

A pair of reel support members 3A, 3B
On the top, the brake shoes 6A, 6A are attached to _one end 7a ₁ , 7b _1.
A pair of brake arms 7A and 7B each having a substantially rectangular shape with B attached thereto are rotatably supported around the shafts 8A and 8B while being urged by torsion springs 9A and 9B.

Here, the left brake arm 7A is shown.
Is rotating counterclockwise around the shaft 8A by the urging force of the torsion spring 9A to brake the reel base 2A.
The brake arm 7B on the right side in the figure rotates clockwise about the shaft 8B by the urging force of the torsion spring 9B to brake the reel base 2B. At this time, a pair of brake arms 7
The positions of the shafts 8A and 8B, which are the pivots of A and 7B, are adjusted by the pair of brake shoes 6A and 6B by the pair of reel bases 2A and
By setting the biting direction to B, the braking force on the pair of reel bases 2A and 2B can be increased.

A pair of reel support members 3A, 3B
, A pair of brake release members 10A and 10B which can freely move toward and away from the pair of brake arms 7A and 7B are slidably provided on the mechanical chassis 1 in directions indicated by arrows X1 and X2. These pair of brake release members 10
A and 10B are a pair of brake arms 7 as described later.
A function is provided for releasing the braking of the pair of reel bases 2A, 2B by A, 7B.

A pair of brake release members 10A, 1
OB includes arm engagement portions 10a ₁ and 10b ₁ corresponding to the mounting position of the large tape cassette L, and arm engagement portions 10a ₂ and 10 corresponding to the mounting position of the small tape cassette S.
b ₂ is the other end 7 of the pair of brake arms 7A, 7B
It is formed toward a _2, 7b _2.

Then, a pair of reel support members 3A, 3A
B is the arm engagement portion when reciprocating between, forming a pair of brake release member 10A, and 10B of the mounting position of the mounting position or small tape cassette S of large-size tape cassette _{L (10a 1, 10a 2)} , ( 10b ₁ , 10b ₂ )
Is retracted to a position where it does not come into contact with the other ends 7a ₂ and 7b ₂ of the pair of brake arms 7A and 7B supported on the pair of reel base support members 3A and 3B.

A pair of brake release members 10A, 1
Reference numeral 0B is formed symmetrically with respect to the supply reel side and the take-up reel side, and the two 10A and 10B are separated from each other and abut on the inverted trapezoidal slide member 11 interposed therebetween. . At this time, a tension spring 12 is hung across the slide member 11 between the brake release member 10A on the supply reel side and the brake release member 10B on the take-up reel side, so that a pair of brake release members 10A, 10B is provided.
Are slid inward by the urging force of the tension spring 12 to press the slide member 11.

On the other hand, the inverted trapezoidal slide member 11 is connected to an electromagnetic plunger 13 serving as a drive source of the pair of brake release members 10A and 10B, and is moved on the mechanical chassis 1 by an arrow X.
_It is slidable in the directions of arrows Y ₁ and Y ₂ orthogonal to the directions ₁ and X ₂ , and is urged forward (in the direction of arrow Y ₁ ) by the urging force of the tension spring 14. In driving the pair of brake release members 10A and 10B, the pair of brake release members 10A and 10B can be driven without using the electromagnetic plunger 13.
A, method of using a cam wheel formed with a cam groove for sliding the 10B in the arrow X _1, X ₂ direction as the drive source is also conceivable.

[0025] Then, when the electromagnetic plunger 13 is in the non-energized state, since the urging force of the spring 14 slide member 11 of inverted trapezoidal tensile moving forward (arrow Y ₁ direction), a pair of brake release member 10A , 10B slide inward from each other, so that a pair of brake release members 10A,
10B, the arm engaging portions (10a ₁ , 10a
_{a 2), (10b 1,} 10b 2) , a pair of reel base supporting members 3A, a pair of brake arms 7 supported on 3B
It retracts to a position where it does not come into contact with the other ends 7a ₂ and 7b ₂ of A and 7B. This state is an initial state, in which the pair of brake arms 7A and 7B are mounted on the reel base 2 at the mounting position of the large tape cassette L or the mounting position of the small tape cassette S.
A and 2B are being braked.

Next, the operation of releasing the braking of the pair of brake arms 7A, 7B to the pair of reel bases 2A, 2B will be described with reference to FIGS.

First, the state shown in FIG. 2 corresponds to a pair of reel bases 2 supported on a pair of reel base support members 3A and 3B.
A and 2B reach the mounting position of the large tape cassette L. At this position, a pair of reels (not shown) in the large tape cassette L are mounted on the pair of reel bases 2A and 2B with the distance between the reels being adjusted. ing.

[0028] Here, when energizing electromagnetic plunger 13, the slide member 11 of inverted trapezoidal tensile against the biasing force of the spring 14 moves rearward (arrow Y ₂ direction), the sliding member of inverted trapezoidal a pair of brake release member 10A by wedge effect by 11, 10B is opposite the direction of arrow _{X 1} together to open the left and right, slide in direction of arrow _{X 2.} Thus, a pair of brake release member 10A, the arm engagement portion formed in _{10B (10a 1, 10a 2)} , (10b 1, 10
b ₂ ), the arm engaging portions 10a ₁ and 10b ₁ abut against the other ends 7a ₂ and 7b ₂ of the pair of brake arms 7A and 7B supported on the pair of reel stand supporting members 3A and 3B. The pair of brake arms 7A and 7B rotate clockwise and counterclockwise around the shafts 8A and 8B, respectively, against the urging forces of the torsion springs 9A and 9B, and the pair of brake arms 7A and 7B are attached to the pair of brake arms 7A and 7B. Brake shoe 6A,
6B is separated from the pair of reel bases 2A and 2B, and the braking is released.

Thereafter, when the electromagnetic plunger 13 is de-energized and the pair of brake arms 7A and 7B are returned to the braking state, the pair of reel support members 3A and 3B are moved to the mounting position of the small tape cassette S. Can be.

Next, the state shown in FIG. 3 shows the pair of reel bases 2 supported on the pair of reel base support members 3A and 3B.
A and 2B reach the mounting position of the small tape cassette S. At this position, a pair of reels (not shown) in the small tape cassette S are mounted on the pair of reel stands 2A and 2B with the distance between the reels being adjusted. ing.

Here, by energizing the electromagnetic plunger 13 and performing the same operation as in FIG. 2, the arm engagement portions (10a) formed on the pair of brake release members 10A and 10B are formed.
₁ , 10a ₂ ) and (10b ₁ , 10b ₂ ), the arm engaging portions 10a ₂ , 10b ₂ of the pair of brake arms 7A, which are supported on the pair of reel support members 3A, 3B,
Since abuts against the other end _7a 2, 7b ₂ of 7B, a pair of brake arms 7A, a pair of brake shoes 6A attached to 7B, 6B is released the brake at a distance from the pair of reel blocks 2A, 2B.

Thereafter, when the electromagnetic plunger 13 is turned off and the pair of brake arms 7A and 7B are returned to the braking state, the pair of reel support members 3A and 3B are moved to the mounting position of the large tape cassette L. Can be.

In the embodiment, the reel base support members 3A,
Although 3B linearly reciprocates between the mounting position of the large tape cassette L or the mounting position of the small tape cassette S, it may be rotated about a fulcrum (not shown). Further, the tape cassette may be a medium-sized tape cassette other than the large and small-sized tape cassettes L and S. In this case, the pair of brake release members 10A and 10B are engaged with the arm engagement corresponding to the mounting position of the medium-sized tape cassette. What is necessary is just to form a part. Further, in the embodiment, the pair of brake release members 10A and 10B are simultaneously operated on the supply reel side and the take-up reel side. However, the configuration is such that the supply reel side and the take-up reel side can be operated individually. You may.

[0034]

According to the reel stand brake mechanism of the present invention described in detail above, when a plurality of types of tape cassettes having different distances between reels are selectively mounted, a pair of reel stands rotatably supported. The reel base support member is moved to the mounting position of each tape cassette in accordance with the distance between the reels corresponding to each tape cassette, and a pair of spring-biased pairs of brake shoes are provided on the pair of reel base support members. Since the brake arm is rotatably supported, the brake shoe attached to the pair of brake arms can be braked so as to bite into the pair of reel bases as compared with the conventional example. In addition, it has a plurality of arm engaging portions corresponding to the mounting positions of a plurality of types of tape cassettes. At the mounting position of each tape cassette, the arm engaging portions corresponding to the tape cassettes are brought into contact with the brake arm to the reel base. Because it has a brake release member that releases the braking of
The brake release mechanism is also simple.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining a configuration of a brake mechanism of a reel base according to the present invention.

FIG. 2 is a plan view for explaining an operation of releasing braking on the reel base when a large tape cassette is mounted in the reel base brake mechanism according to the present invention.

FIG. 3 is a plan view for explaining an operation of releasing braking on the reel base when a small tape cassette is mounted in the reel base brake mechanism according to the present invention.

FIG. 4 is a plan view for explaining a reel base brake mechanism in a conventional tape player that can share a large and small tape cassette.

[Explanation of symbols]

2A, 2B ... a pair of reel blocks, 3A, 3B ... a pair of reel base supporting members, 6A, 6B ... a pair of brake shoes, a pair of brake arms, 10A, 10B ... a pair of brake release member, _10a 1, _10a 2, 10b ₁ , 10b ₂ : arm engagement portion, 13: drive source (electromagnetic plunger) for a pair of brake release members L: large tape cassette, S: small tape cassette.

Claims (1)

[Claims] 1. A pair of reel bases for selectively mounting a pair of reels having different distances between reels of a pair of reels respectively housed in a plurality of types of tape cassettes, and the pair of reel bases being rotatable. A pair of reel stand supporting members for supporting and moving the pair of reel stands to the mounting position of each tape cassette in accordance with a distance between reels corresponding to each tape cassette; A pair of brake arms that are freely supported and that attach the pair of brake shoes to brake the pair of reel stands via spring force; and a brake arm that is connected to a drive source near the reel stand support member. And a plurality of arm engagement portions corresponding to the mounting positions of the plurality of types of tape cassettes. Reel base braking mechanism, characterized in that the arm engaging unit corresponding to the tape cassette and a brake release member for releasing the contact with the brake to the reel base on the brake arm.