JPH0333958Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand device used in a tape recorder such as a video tape recorder.

Conventionally, the reel stand of a tape recorder is equipped with a brake means to brake the rotation when stopped, and it is known that the brake means is an electromagnetic brake and is built into the reel stand, but the number of parts such as machined parts is large. The present applicant proposed an improved reel stand braking device in Japanese Utility Model Application Publication No. 58-26758, but the reel stand braking device of this proposal has an electromagnetic coil section at the bottom of the reel stand. Because of this protrusion, there is a limit when it comes to downsizing the tape recorder.

The purpose of the present invention is to propose a reel stand device that is improved so that it can be made thinner and smaller in order to correspond to the miniaturization of tape recorders.

The present invention is characterized by a reel shaft that is fixed to the chassis and rotatably holds the reel stand, a fixed magnetic plate fixed to the chassis, and the reel shaft formed by protruding the fixed magnetic plate. a cylindrical fixed iron core centered on the reel shaft, a movable side magnetic plate movable only in the axial direction about the reel axis, and a cylinder formed by protruding the movable side magnetic plate and centered on the reel axis; a movable iron core, a spring that biases the movable magnetic plate in a direction to separate it from the fixed magnetic plate, a coil wound around the fixed iron core, and movement of the movable magnetic plate. a friction material for applying a brake to the reel stand, and a friction plate connected to the reel stand to which the friction material is pressed, and by attracting the movable side magnetic plate to the fixed side magnetic plate side. The above-mentioned friction material is brought into pressure contact with the above-mentioned friction plate to apply a brake to the reel stand.

The present invention will be explained below with reference to illustrated embodiments. 1st
As shown in FIGS. 3 to 3, the reel stand device has a cylindrical fixed iron core 1a formed at the center of a fixed side magnetic plate 1, and an insulating plate 2, an excitation coil 3, and a guide collar 4 surrounding it.
are fitted and covered with the case 5, and the case 5 is caulked and fixed to the stationary side magnetic plate 1, and the excitation coil 3 and the guide collar 4 are prevented from coming off upward by the case 5.
An annular friction material 10 such as felt on the top surface of the case 5
A movable magnetic plate 7 has a friction plate 6 made of synthetic resin on its upper surface, and an annular friction material 11 such as felt is adhered and fixed on the lower surface of the movable side magnetic plate 7. is placed on the movable side magnetic plate 7 and is urged away upwardly by the coil spring 12, and a cylindrical movable iron core part 7a is formed at the center of the movable side magnetic plate 7, with its lower end facing the fixed iron core part 1a, and the movable side magnetic plate 7 is prevented from coming off by the guide collar 4, and the whole is made into a unit, and is fitted onto the reel shaft 13 fixed to the chassis 8, and the fixed side magnetic plate 1 is fixed to the chassis 8 with screws 14, and the reel is attached to the reel shaft 8. The stand 9 is fitted, and the reel stand 9 and the friction plate 6 are connected.

Describing the shape of each of the above components in detail, the fixed side magnetic plate 1 has a fixed portion 1b protruding from its periphery, and a cutout portion 1c and a cutout portion 1d.

A protrusion 2a is formed on the outer periphery of the insulating plate 2, and a notch 2b is formed in the protrusion 2a, into which the lead wire of the excitation coil 3 is inserted.

The guide collar 4 has a cylindrical portion 4a, a protruding plate 4b around the upper side, a lower protrusion 4c and a higher protrusion 4d upward on the protruding plate 4b, and a U-shaped protruding portion having a claw portion 4e at the upper end. 6f are integrally formed.

The case 5 is formed into a cylindrical shape with a bottom, and has a protrusion 5a on the opening side that is fitted into the notch 1c of the fixed side magnetic plate 1 and fixed by caulking, and a notch into which the protrusion 2a of the insulating plate 2 is fitted. A portion 5b is formed, a through hole 5d is formed in the center of the bottomed portion 5c, a notch 5e in which the protrusion 4c of the guide collar 4 is fitted around the hole 5d, and a notch in which the protrusion 4d and the U-shaped protrusion 4f are fitted. 5f is formed.

A protrusion 6a protrudes around the friction plate 6 to be connected to the reel stand 9, and the upper and lower surfaces of the friction plate 6 are formed with finely uneven surfaces that come into contact with the friction materials 10 and 11. ing.

A through hole 7b is formed on the outside of the movable iron core portion 7a in the movable side magnetic plate 7, and after the protruding portion 4f of the guide collar 4 is inserted thereinto, the protruding portion 4f of the guide collar 4 is inserted thereinto, and is then prevented from slipping out and being prevented from rotating by the claw portion 4e.

The fixed iron core portion 1a of the fixed side magnetic plate 1 and the movable iron core portion 7a of the movable side magnetic plate 7 are each formed by embossment processing.

The reel stand 9 is formed into a cylindrical shape with a bottom, and has cylindrical portions 9a and 9b formed above and below the center, and an outer cylindrical portion 9c.
A notch 9d into which the protrusion 6a of the friction plate 6 is fitted is formed on the inside of the notch.

When the reel stand device is configured as described above and the excitation coil 3 is not energized, the friction plate 6 and the reel stand 9 are rotated in a free state, and when energized, the fixed iron core part 1a is excited and the movable iron core part 7a is attracted against the spring 12, and the lowering of the movable magnetic plate 7 presses the friction plate 6 of the annular friction member 11 against the lower annular friction member 10, thereby braking the rotation of the reel stand 9.

When the reel stand device is configured as described above, the fixed iron core part 1a and the movable iron core part 7a are formed by stamping with a press instead of cutting, so the cost is reduced, and the fixed side magnetic plate 1 and the movable side magnetic plate Since the plate 7 and the case 5 can be formed by press working, the manufacturing cost of the parts can be further reduced.

Also, the lead wire of the excitation coil 3 is connected to the notch 2 of the insulating plate 2.
Since the wire is sandwiched between the terminals b, it is possible to eliminate terminals, reduce the number of parts, eliminate soldering, and facilitate terminal processing of the lead wire.

Furthermore, the part of the brake mechanism provided between the fixed side magnetic plate 1 and the movable side magnetic plate 7 is a guide collar 4.
It operates using the reel as a guide, so it can be assembled without a reel shaft.

Since each part of the brake mechanism can be housed inside the reel stand 9, parts protruding from the lower part of the reel stand 9 and the chassis 8 can be eliminated, and the height of the tape recorder can be reduced.

As described above, in the present invention, the fixed core part and the movable core part are formed so as to protrude from the fixed side magnetic plate and the movable side magnetic plate, making it easier to manufacture parts and reducing the number of parts. In addition, it is possible to provide a reel stand device that has excellent practical effects such as being able to change the braking force from a small braking force to a large braking force by pressing the friction material against the friction plate.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional side view of the reel stand device, FIG. 2 is a cross-sectional plan view of the main part inside the reel stand cut out, and FIG. 3 is a main part of the same part. It is an exploded perspective view. 1...Fixed side magnetic plate, 1a...Fixed iron core part, 3
... Coil, 4 ... Guide collar, 7 ... Movable side magnetic plate, 7a ... Movable iron core part, 8 ... Chassis,
9... Reel stand, 12... Spring, 13...
reel axis.

Claims (1)

[Scope of utility model registration request] A reel shaft fixed to the chassis and rotatably holding the reel stand, a fixed magnetic plate fixed to the chassis, and a cylindrical shape centered on the reel shaft formed by protruding the fixed magnetic plate. a fixed iron core portion, a movable magnetic plate that is movable only in the axial direction about the reel shaft, and a cylindrical movable iron core portion that is formed by protruding the movable magnetic plate and is centered on the reel shaft. , a spring that urges the movable magnetic plate away from the fixed magnetic plate, a coil wound around the fixed iron core, and a brake on the reel stand by the movement of the movable magnetic plate. It has a friction material for applying the friction material and a friction plate connected to the reel stand to which the friction material is pressed. A reel stand device configured to apply a brake to the reel stand by pressing it against a plate.