JPS6141143Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake release device, and more particularly to a brake release device suitable for a brake mechanism of a rotating body such as a tape recorder or a record player.

2. Description of the Related Art Devices equipped with a rotating body, such as tape recorders and record players, are designed to increase the inertia of their rotational motion so that their rotation is stable. Conversely, since it takes time for these rotating bodies to go from a rotating state to a stopped state, a brake device is provided so that the operation from rotating to stopping can be completed in a short time. This device is especially necessary for tape recorders, and it is very powerful because in the case of "winding → stop → playback", the next playback operation will not start unless the rotation of the rotating reel base is stopped instantaneously. Brake equipment is available.

However, the greater the braking force of the brake device, the greater the driving force required to release the brake.

Conventionally, tape recorders have been equipped with a solenoid plunger as a device for dissipating the braking force of a brake device on a reel stand. This release device continues to consume power while the tape recorder is in operation, and further increases the cost of the tape recorder by the amount of the solenoid plunger.

Therefore, this idea uses the characteristics of the motor itself, which is the drive source, to release the braking force of the brake device by itself while the current is energized, without using a solenoid plunger. This is characterized in that the rotor is movable in the axial direction, and the axial movement of the rotor is used to release the braking force of the brake arm that supports the brake shoe via the main shaft.

Hereinafter, an embodiment in which a brake release device according to the invention is applied to a tape recorder will be described with reference to the attached drawings. First, reference numeral 1 indicates a brake drum directly connected to a reel stand, and a brake shoe 2a fixed to one end of a brake arm 2 is in contact with the circumferential surface of this brake drum 1. This brake arm 2
is supported at its intermediate point by a pivot 2b, and at the other end of the brake arm 2 is stopped the end of a tension spring 2c which gives the brake shoe 2a a contact behavior in a normal state.

Furthermore, one end 3a of the brake release arm 3 is in contact with a position closer to the tension spring 2c than the pivot 2b of the brake arm 2, and the brake release arm 3 has an L-shape as a whole, with its bent portion being the pivot. 3b, and the other end extends to form a contact end 3c that contacts the main shaft of the motor.

An idler 4 directly connected to a motor as a drive source to be described later is in contact with the brake drum 1, and the rotation of the idler 4 rotates a reel stand (not shown) via the brake drum 1. .

The central shaft of the idler 4 also serves as the main shaft 5a of the motor 5, and is supported by a bearing 52 in a casing 51 of the motor, and a rotor 5b is fixed to the main shaft 5a. This rotor 5b has the same axis as the stator 5c fixed in the casing 51, and the rotor 5b and main shaft 5a are fixed by supplying power to the stator 5c, but the main shaft 5a is movable along the axial direction. Due to the braking behavior of the brake arm 2, the main shaft 5a is pushed via the brake release arm 3, and the stator 5c
The rotor 5b is offset in the axial direction with respect to the rotor 5b (FIG. 2).

Next, the action of releasing the braking force by the brake release device of this invention will be explained. First, motor 5
When no power is supplied to the brake drum 1 (FIGS. 1 and 2), the brake arm 2 is pressed against the brake drum 1 by the elastic force of the tension spring 2c, and the brake drum 1 is held in a restrained state. Then, when the motor 5 is energized, the stator 5c to the rotor 5
The magnetic flux flowing through b applies a driving force to the main shaft 5 to move the rotor 5b so that the magnetic flux resistance becomes small.
give to a. This movement of the main shaft 5a pushes the contact end 3c of the brake release arm 3, and the brake release arm 3 rotates in the direction of arrow Y in FIG. Push against the spring 2c to separate the brake shoe 2a from the brake drum 1 (see Figures 3 and 4).
figure). In this state, since the motor 5 is rotating, the reel stand is rotated via the idler 4.

In the above description, the brake release device of this invention is applied to a tape recorder, but the invention can also be applied to a record player.

As is clear from the above explanation, the brake release device of this invention enables the main shaft of the motor to move in the axial direction, and utilizes the magnetic resistance between the stator and rotor to move the main shaft axially when power is supplied to the motor. Since the structure is configured such that the brake arm of the brake arm is moved away from a rotating body such as a brake drum using the driving force generated by the movement, a plunger for releasing the brake is not required, and there is no power consumption. Obtain low-cost equipment without heat generation.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the brake release device according to this invention, Fig. 2 is a sectional view taken along the line of Fig. 1, and Figs. 3 and 4 are sectional views and plan views showing the brake release state. It is. 1...Brake drum, 2...Brake arm, 2
a... Brake shoe, 2b... Pivot, 2c... Tension spring, 3... Brake release arm, 3a... End,
3b...Pivot, 3c...Contact end, 4...Idler, 5...Motor, 5a...Main shaft, 5b...Rotor, 5c...Stator, 51...Casing, 5
2...Bearing.

Claims (1)

[Scope of utility model registration request] A motor whose main shaft position changes depending on the power supply state and power outage state, a rotating body rotated by the output of this motor, a brake arm that applies braking to this rotating body, and a brake arm that releases the braking force of this brake rod. A brake release device comprising: a brake release arm, the brake release device being configured to push the brake release arm with a main shaft that slides when power is supplied to the motor to release the braking force applied to the rotating body by the brake arm.