JP2002208197A - Recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a braking mechanism capable of preventing spreading during the assembling of a brake arm and a hard brake or during the operation by simple contrivance of a helical torsion spring. SOLUTION: The recording/reproducing device including a braking mechanism having a function for releasing a brake from a reel base by the reverse rotation of the reel base for rotary-driving a tape reel is provided with a brake arm 23 having a fulcrum shaft 22, a coil spring 16 for pressing the brake arm 23 to a tape feeding reel base side, a hard brake 25 attached to the brake arm 23 so as to be rotated and axially moved, and having a tooth part to be engaged with the tape feeding reel base, and a helical torsion spring 27 supported on the brake arm 23 to press the hard brake 25 to the tape feeding reel base side. One spring end 27b of the helical torsion spring 27 penetrates the hard brake 25, protruded from the brake arm 23, and provided with a holding piece 27c formed to be bent on its tip, and thus the pulling-out of the helical torsion spring 27 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel base brake mechanism using a tape cassette and suitable for use in, for example, a mini digital VTR device. The use of a biasing coil spring prevents unevenness.

[0002]

2. Description of the Related Art FIG. 6 is a plan view showing a mechanism of the above-mentioned mini digital VTR. Reference numeral 1 denotes a main chassis, on which a rotary head drum 2 is mounted. On a linear skate chassis 3 that can move forward and backward with respect to the main chassis 1, a reel base 4 on the tape supply side and a reel base 5 on the tape winding side are supported. A pendulum gear 6 driven by a reel motor (not shown) is selectively meshed between the two reel stands 4 and 5, and is driven to rotate in the tape winding direction.

The driving force of the loading motor 7 drives a linear skate arm (not shown) via transmission gears 8, 9, and 10, the linear skate arm 3 performs linear skate operation on the linear skate chassis 3, and a pair of reels on the tape supply side. The table 4 and the reel table 5 on the tape winding side are brought close to the rotating head drum 2 (loading position).
Alternatively, an operation of separating (unloading position) can be performed.

Further, a pair of tape guide gears 11 and 12 are driven to rotate in conjunction with the operation of the linear skate arm,
The guide blocks 17, 18 on which the tape guide posts 15, 16 are erected are moved along the guide rails 19, 20 via the tape guide arms 13, 14, and the magnetic tape (not shown) pulled out by the tape guide posts 15, 16 Can be helically wound around the rotary head drum 2.

Here, a brake mechanism 21 is attached to the reel base 4 on the tape supply side. Brake mechanism 2
Reference numeral 1 denotes a brake arm 23 rotatable by a fulcrum shaft 22 and a shaft 2 provided at one end of the brake arm 23.
4, a hard brake 25 having a toothed portion into which a long shaft hole 25a is inserted and movably mounted, and a brake arm 2
A coil spring 26 biases the spring 3 toward the reel base 4 and a torsion coil spring 27 biases the hard brake 25 toward the reel base 4.

The operation of the above-described brake mechanism 21 is such that when the hard brake 25 is engaged with the tape supply side reel base 4, the tape is prevented from being pulled out from the reel of the tape supply side reel base 4, and the tape supply side reel base 4 is moved. By reverse rotation, the hard brake 25 is separated from the reel base 4 and the brake is released. Further, from the brake release state, the operation of the mode lever causes the hard brake 25 to engage with the tape supply side reel base 4 again to be in the reset state.

Thus, at the unloading position of the linear skate chassis 3, the reel base 4 on the tape supply side is engaged with the hard brake 25 of the brake mechanism 21 and cannot be rotated. Here, the linear skate chassis 3
Is loaded, the magnetic tape is pulled out from the reel of the tape take-up reel base 5 without a brake mechanism and wound around the rotary head drum 2.

By the way, since the tape cannot be pulled out in a state where the tape is not wound on the reel of the tape winding side reel base 5, the brake mechanism 21 of the tape supply side reel base 4 is released in this case. The tape is drawn from the reel on the tape supply side reel base 4, and the tape is wound around the rotary head drum 2.

FIG. 7 shows the disassembled state of the brake mechanism 21 described above. According to this, the assembling procedure of the brake mechanism 21 is as follows. The long shaft hole 25 a of the hard brake 25 is inserted into the shaft 24 of the brake arm 23 and assembled, and the coil portion 28 of the torsion coil spring 27 is attached to the brake arm 23. Pin 2 of
3a, and the spring end 27a on one end of the torsion coil spring 27 is
b. Thereafter, the spring end 27b which is bent and raised vertically to the other end of the torsion coil spring 27 is hard brake 2
5 through the through hole 25b and the hole 23 of the brake arm 23
The assembly is completed by engaging with c.

[0010]

However, in the conventional brake mechanism 21 described above, the brake arm 23 and the hard brake 25 are locked only by the spring end 27b of the torsion coil spring 27 which is bent vertically. Therefore, the vertically bent spring end 27b of the torsion coil spring 27 easily comes out of the hole 23c of the brake arm 23 during the assembling work of the brake mechanism 21, and thus the brake arm 23 and the hard brake 25 are easily broken. There is a problem. Further, there is a problem that the deviation between the brake arm 23 and the hard brake 25 frequently occurs even during the operation of the brake mechanism 21.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and it is possible to reduce the variation at the time of assembling the brake arm and the hard brake or the variation during operation by a simple device of the torsion coil spring. It is an object of the present invention to obtain a recording / reproducing apparatus having a brake mechanism capable of preventing the recording / reproducing.

[0012]

In order to achieve the above object, a recording / reproducing apparatus according to the present invention projects a spring end of a torsion coil spring for biasing a hard brake portion from a brake arm portion, A holding mechanism is provided at the tip of the brake arm so as to prevent the torsion coil spring from coming out of the brake arm by bending the holding piece.

According to the recording / reproducing apparatus configured as described above, the holding piece at the spring end of the torsion coil spring is engaged with the brake arm, and the torsion coil spring can be prevented from coming off. The brake arm and the hard brake once assembled can be maintained in an assembled state without variation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a brake mechanism applied to a recording / reproducing apparatus according to the present invention will be described with reference to the drawings, taking an example in which the embodiment is applied to a mini digital VTR apparatus.

FIG. 1 is a perspective view of the brake mechanism separated, and FIG. 2 is a perspective view of the brake mechanism in an assembled state. The same parts as those of the conventional example described with reference to FIG. explain.

Reference numeral 23 denotes a brake arm made of a resin molded product constituting a main part of the brake mechanism 21, and a fulcrum shaft 22 is suspended from a lower surface substantially at the center. An elongated shaft hole 25a formed with a hard brake 25 having a tooth portion at a part of an outer peripheral portion is inserted into a shaft 24 vertically extending from a lower surface on one end side of the brake arm 23.

The assembly of the brake arm 23 and the hard brake 25 described above is performed by a torsion coil spring 27. As in FIG. 7, the torsion coil spring 27 has a spring end 27a extending from one end of the coil portion 28, and a spring end 27b bent perpendicularly to the end extending from the other end of the coil portion 28. Have. In the present invention, this spring end 27b
Is provided with a holding piece 27c which is further bent horizontally from the tip end of the holding member 27c.

That is, the torsion coil spring 27 inserts the coil portion 28 into the pin 23a of the brake arm 23, and engages one spring end 27a of the torsion coil spring 27 with the spring hook portion 23b of the brake arm 23. At the same time, the holding piece 27c, which is bent horizontally together with the vertically bent spring end 27b of the torsion coil spring 27, is passed through the through hole 25b of the hard brake 25, and the brake arm 2
The assembly is completed by projecting the holding piece 27c from the third hole 23c and locking the holding piece 27c on the upper surface of the brake arm 23 as shown in FIG.

The brake mechanism 2 thus assembled
According to 1, the holding piece 27c of the torsion coil spring 27 does not come out of the hole 23c of the brake arm 23,
Therefore, the brake arm 23 and the hard brake 25 do not vary, and the assemblability of the brake mechanism 21 can be improved.

To mount the brake mechanism 21 on the linear skate chassis 3, the fulcrum shaft 22 of the brake arm 23 is inserted into a relatively large window hole 3a formed in the linear skate chassis 3 as shown in FIG. Thereafter, the coil spring 26 is locked between the spring hook portion 23d of the brake arm 23 and the linear skate chassis 3 to complete the mounting.

FIG. 3A shows an unloading operation state of a so-called VTR device in which the tape supply reel base 4 is made unrotatable by the brake mechanism 21. That is, the brake arm 23 is biased toward the tape supply side reel base 4 by the spring biasing force of the coil spring 26, and the hard brake 25 is biased toward the tape supply side reel base 4 by the spring force of the torsion coil spring 27. As a result, the teeth of the hard brake 25 are engaged with a gear (not shown) of the tape supply reel base 4.

In the loading operation of the VTR device, when the tape is being wound on a reel of a reel (not shown), the tape is rotated by rotating the reel on the tape winding side. When the tape is not wound on the reel of the side reel base, the brake mechanism 21 is released from the tape supply side reel base 4 and the tape is pulled out.

Hereinafter, the operation for releasing the brake mechanism 21 from the tape supply side reel base 4 and pulling out the tape from the reel, and the operation for releasing the brake mechanism 21 from the tape supply side reel base 4 will be described.
3 to 5 will be described with reference to FIGS.

From the brake state of the tape supply side reel base 4 shown in FIG. 3A, the reel base 4 is reversed in the direction of arrow a which is the tape winding direction at a predetermined rotation angle by a signal command. The reverse rotation of the tape supply side reel base 4 urges the hard brake 25 to rotate in the direction of the arrow b as shown in FIG. 3B, and thereafter the hard brake 25 is moved by the torsion coil spring 27 as shown in FIG. Due to the spring force, the long shaft hole 25a moves backward along the shaft 24 of the brake arm 23, and the engagement with the tape supply side reel base 4 is released. At this time, the return operation piece 25 c formed on the outer peripheral portion of the hard brake 25 abuts against the chassis wall 29. As a result, the tape supply side reel base 4 is in a free state, and the tape can be pulled out from the reel.

Next, the operation of resetting the brake mechanism 21 to the tape supply side reel base 4 is performed, for example, as shown in FIG.
The mode slider 30 slides in conjunction with an operation such as the ew mode, and the lever 30a of the mode slider 30 pushes back the fulcrum shaft 22 of the brake arm 23 as shown in FIG. 5E. Thereby, the brake arm 23 operates to move backward in the direction of arrow c. On the contrary, the return operation piece 25c of the hard brake 25 is restrained by the chassis wall 3a, and the hard brake 25 is moved in the direction of arrow d by the reaction. Simultaneously with the rotation, the long shaft hole 25a returns to the rotation position in FIG. 3A along the shaft 24 of the brake arm 23 by the spring force of the torsion coil spring 27.

Thereafter, the mode slider 30 is moved away from the fulcrum shaft 22 of the brake arm 23 by the operation of FIG.
As shown at f, the hard brake 25 rotates together with the brake arm 23 in the direction of the arrow e by the spring force of the coil spring 26, and the teeth of the hard brake 25 mesh with the tape supply side reel base 4 to bring the brake state again. it can.

The brake mechanism 21 performing the above operation is provided with a holding piece 27 at the tip end of a spring end 27b of a torsion coil spring 27 for biasing the hard brake 25.
c is bent and the holding piece 27c is
By locking the torsion coil spring 27 to the upper surface of the brake arm 23, the torsion coil spring 27 does not come out of the brake arm 23.
Therefore, once the brake mechanism 21 is assembled, the brake arm 23 and the hard brake 25 do not vary, so that the assemblability of the brake mechanism 21 can be significantly improved, and even during the operation of the brake mechanism 21. There is no variation and a highly reliable brake mechanism is obtained.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

In this embodiment, the structure in which the hard brake 25 is mounted on the lower surface of the brake arm 23 has been described.
5 may be assembled. In this case, the holding piece 27 c bent at the tip of the spring end 27 b of the torsion coil spring 27 is locked on the upper surface of the hard brake 25.

In this embodiment, the case where the present invention is applied to a brake mechanism of a mini digital VTR apparatus has been described. However, the present invention can be widely applied to a magnetic recording / reproducing apparatus in which a tape feed side reel base has a brake mechanism. It is.

[0031]

As described above, according to the recording / reproducing apparatus of the present invention, the spring end of the torsion coil spring for urging the hard brake portion is projected from the brake arm portion, and the holding piece is attached to the tip end portion. Since the brake mechanism is formed by bending to prevent the torsion coil spring from coming out of the brake arm, once assembled, the brake arm and hard brake do not come apart, The assemblability of the mechanism can be greatly improved. Further, even during the operation of the brake mechanism, no variation occurs, and a highly reliable recording / reproducing apparatus can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disassembled state of a brake mechanism according to the present embodiment.

FIG. 2 is a perspective view of the brake mechanism in an assembled state.

FIG. 3A is a plan view of the reel base in a brake operation state. b is a plan view of the operating state when the reel base is reversed.

FIG. 4 is a plan view of a state in which a brake is released from the reel base c. d is a plan view immediately before a reset operation of the brake mechanism.

FIG. 5 is a plan view showing a reset operation state of an e-brake mechanism. It is a top view of the brake operation state of f reel base.

FIG. 6 is a plan view of a mechanism section of the mini digital VTR device.

FIG. 7 is an exploded perspective view of a conventional brake mechanism.

[Explanation of symbols]

2 ... rotating head drum, 3 ... linear skate chassis,
4 ... Tape supply side reel base, 5 ... Tape winding side reel base, 21 ... Brake mechanism, 22 ... Support axis, 23 ... Brake arm, 24 ... Axis, 25 ... Hard brake, 25a ...
Long hole shaft hole, 26: coil spring, 27: torsion coil spring, 27b: spring end, 27c: holding piece, 28: coil part, 30: mode slider

Claims (2)

[Claims] 1. A recording / reproducing apparatus comprising a brake mechanism having a function of releasing a brake from a reel base by a reverse rotation operation of a reel base for driving a tape reel to rotate, wherein the brake mechanism has a rotation fulcrum shaft. An arm portion; a spring member for urging the brake arm portion toward the reel base; and a hard brake having a tooth portion that is rotatably and axially mounted on the brake arm portion and that meshes with the reel base. And a torsion coil spring supported by the brake arm and biasing the hard brake portion toward the reel base. One end of the torsion coil spring has the spring arm portion. From the torsion coil spring to prevent the torsion coil spring from slipping out. Recording and reproducing apparatus to be. 2. The recording / reproducing apparatus according to claim 1, wherein the torsion coil spring has a spring end penetrating the hard brake part and penetrating the brake arm part,
A recording / reproducing apparatus comprising a holding piece formed by bending a tip end of the spring end horizontally toward an upper surface of the brake arm.