JP3077706B2 - Viscous damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, for example, to a viscous damper that is applied to the cassette desorber such as a magnetic recording and reproducing apparatus.

[0002]

6 and 7 show a cross-sectional plan view and a side sectional view of a conventional viscous damper of this type, wherein 1 is a cylindrical fixing plate integrally formed around a main body 2.
Reference numeral 3 denotes a ring-shaped groove formed between the fixing plate 1 and the main body 2, and 4 denotes a shaft 4a pivotally supported by a central shaft hole 2a of the main body 2.
Rotating plate 5 has four fan-shaped stirring plates protruding from the rotating plate 4 so as to be positioned in the ring-shaped groove 3, 6 is an input shaft for driving the rotating plate 4 to rotate, and 7 is the ring The damper grease is filled in the groove 3.

Next, the operation will be described. When a cassette mounting device (not shown) is driven, the input shaft 6 rotates, and the stirring plate 5 rotates together with the rotating plate 4 to stir the damper grease 7 in the ring-shaped groove 3. Thereby, the damper grease 7
Are separated by the stirring plate 5 and pass through the gap between the fixed plate 1 and the main body 2 and the stirring plate 5, so that viscous resistance is generated. This viscous resistance increases as the relative speed between the fixed plate 1 and the stirring plate 5 increases, so that when the input shaft 6 undergoes a rapid rotation change, the resistance increases, and the rapid rotation change is prevented and the drive is stopped. The cassette mounting device operates at a speed at which the force and the viscous resistance balance.

[0004]

Since the conventional viscous damper is configured as described above, if it is incorporated in a cassette mounting device, it rotates clockwise or counterclockwise when the cassette is mounted or removed, thereby producing a damper effect. For this reason, if the damper effect is set so that the cassette does not suddenly pop out when removing the cassette, a large operation force is required at the time of mounting the cassette, so excessive force acts on other components and damage to the component etc. There was a problem that occurs.

The present invention has been made to solve the above problems, and has as its object to obtain a viscous damper having a different damper effect between clockwise rotation and counterclockwise rotation.

[0006]

A viscous damper according to the present invention is provided with a groove which forms a continuous ring-shaped passage around a shaft, and a fixing portion in which the groove is filled with damper grease; is supported on the shaft, and a rotating part having a stirring unit located in the damper grease of the groove, in which the damper grease during rotation of the rotating portion is set to be a damper for the stirring unit, the fixed to one of the rotational direction end face of the stirring unit, provided with a deflection unit having a pair of elastic extending portions which are separated from each other, during rotation in a predetermined direction of the rotating part, the stirring portion along the path movement And
The pair of elastic extension portions increase the distance between the distal end portions by the resistance of the damper grease, thereby reducing the gap in the passage.
While rotating the rotating part in the opposite direction,
A pair of Jiangyin extension is caused by the pressure of the above damper grease
The gap between the above passages is widened by reducing the distance between the tips.
It is intended to make it .

[0007]

According to the present invention, the rotation of the rotating portion in a predetermined direction is performed.
During rolling, stirring unit moves along the path, the resistance of the pair of elastic extending portions Hurghada Npagurisu fixed to the stirring unit
By narrowing the gap between the shores by widening the distance between the tips
Both during rotation in the opposite direction of the rotating portion, Da Npagurisu
The distance between the distal ends of the pair of elastic extension portions is reduced by pressure .
This increases the gap in the passage to change the viscous resistance .

[0008]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a cross-sectional plan view and a side sectional view of a viscous damper according to the present invention. Reference numeral 1 denotes a cylindrical fixing plate integrally formed around a main body 2, which constitutes a fixing section together with the main body 2. I do. Reference numeral 3 denotes a ring-shaped continuous passage formed between the fixed plate 1 and the main body 2 and a circuit to be described later.
A ring-shaped groove allowing rotation of the rotary plate by 360 degrees or more ; 4 a rotary plate having a shaft 4a pivotally supported by a central shaft hole 2a of the main body 2; The agitating unit is composed of four fan-shaped agitating plates protruding so as to be positioned together with the rotating plate and constitutes a rotating unit. Reference numeral 6 denotes an input shaft fixed to the rotating plate 4 for driving the rotating unit to rotate.
Is a damper grease filled in the ring-shaped groove 3 and has the same configuration as that of the conventional viscous damper described with reference to FIGS. Reference numerals 8 denote flexures fixed to one of the end faces in the rotation direction of the agitating plate 5 (counterclockwise in the embodiment). A pair of elastic extension portions are formed in a V-groove shape so as to be separated from each other. As a whole, as shown in a perspective view in FIG. 3, the shape is formed in a vertical direction with respect to the stirring plate 5.

Next, the operation of the viscous damper according to the present invention configured as described above will be described. The damper grease 7 is stirred when the input shaft 6 is rotated by the operation of the cassette mounting device (not shown) and the stirring plate 5 rotates counterclockwise along the passage along with the rotating plate 4. In this stirring operation, as shown in FIG.
Of the pair of elastic extension portions, the distal end portions of the respective elastic extension portions are pushed and expanded as shown by arrows in the figure, and the gap between the fixing plate 1 and the main body 2 is narrowed. As a result, the damper grease 7 passes through the small gap, so that a larger viscous resistance is generated than usual, and the damper effect is increased.

On the other hand, agitating plate 5 is in the passage, as shown in FIG. 5
In the case where the damper grease 7 rotates clockwise, the damper grease 7 does not forcibly enter the V-shaped groove between the pair of elastic extension portions of the bending portion 8 and the pressure of the damper grease from the surroundings as shown by the arrow in the drawing. In addition, the distal end between the pair of elastic extension portions is pressed and narrowed, and the gap between the stirring plate 5 and the fixed plate 1 and the main body 2 is widened. As a result, the viscous resistance is smaller than usual, and the damper effect is reduced. Can be done.

Further, although the elastic extension of the flexible portion 8 Example was a direction perpendicular to the moving direction and the axis 4a of the rotary plate 4, similarly to be movable in the extending direction of the shaft 4a the Is obtained.

[0012]

As explained above, according to the present invention,
Agitation that moves (rotates) along the passage in the damper grease
Of the tip of the elastic extension of the flexure
Since the interval is varied and the passage area of the damper grease passing through the stirring section is varied to change the damper characteristics, a viscous damper having a different damper effect depending on the rotation direction can be obtained. Thereby, for example, a cassette detaching device
In this case, it is possible to prevent a component from being damaged when the cassette is mounted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a viscous damper according to one embodiment of the present invention.

FIG. 2 is a side sectional view of a viscous damper according to the present invention.

FIG. 3 is a perspective view of a stirring plate and a bending portion.

FIG. 4 is an operation explanatory view in a state where the viscous resistance of the viscous damper according to the present invention is increased.

FIG. 5 is an operation explanatory view in a state where the viscous resistance of the viscous damper according to the present invention is reduced.

FIG. 6 is a cross-sectional plan view of a conventional viscous damper.

FIG. 7 is a side sectional view of a conventional viscous damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed plate 2 Main body 3 Ring-shaped groove 4 Rotating plate 5 Stirring plate 6 Input shaft 7 Damper grease 8 Flexure

Continuation of the front page (56) References JP-A-62-13874 (JP, A) JP-A-60-138032 (JP, U) JP-A-56-127470 (JP, U) JP-A-55-22517 (JP) , U) Shokai 62-75723 (JP, U) Shokai 1-77151 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 9/12 G11B 15/675

Claims (1)

(57) [Claims] 1. A ring-shaped continuous passage is formed around a shaft.
A groove formed provided a fixing unit filled with damper grease to the groove, is supported on the shaft, and a rotating part having a stirring unit located in the damper grease of the groove, during rotation of the rotating part The damper grease serves as a damper for the agitating section, wherein the damper grease includes a bending section fixed to one of end faces in the rotation direction of the agitating section and having a pair of elastic extending portions separated from each other. When rotating in a predetermined direction, the stirring section moves along the passage.
Then, the pair of elastic extension portions increase the distance between the tip portions by the resistance of the damper grease, so that the gap of the passage is formed.
While narrowing the interval, when rotating the rotating part in the opposite direction,
The pair of elastic extension portions are caused by the pressure of the damper grease.
The gap between the above passages is
Viscous damper being characterized in that so as to be widely.