JPH0229540Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> This invention relates to a brake device that applies brakes to a pair of rotating bodies such as a VTR reel stand.

<Prior art> Conventionally, equipment such as VTRs has the function of decelerating or stopping the rotation of the reel stand in multiple stages, so brake torque is applied depending on the braking operation state, and the type of braking force is A number of brake devices were installed for each reel stand. For this reason, many brake levers and mechanisms for operating the brakes are required, making the brake mechanism complicated, and the number of parts increases, resulting in an increase in cost.

<Purpose of the invention> The purpose of this invention is to eliminate the above-mentioned conventional drawbacks,
A control lever is provided on each of the brake members provided on each of the pair of rotating bodies, a third brake member is connected to one brake member, one of the control levers is swung by displacement of the control pin, and the control lever is By applying the braking force from the three brake members mentioned above to each rotating body by swinging the other operating lever in conjunction with the above, multiple braking operations can be switched using a simple brake operating cam mechanism. The object of the present invention is to provide a brake device that can be used at a low price by reducing the number of parts.

<Structure of the invention> This invention includes a first brake member which is biased by an elastic body in a direction in which it contacts one of the rotating bodies and is rotatably supported, and an elastic body in a direction in which it contacts the other rotating body. a second brake member that is biased by and rotatably supported; a third brake member that is urged by the body in a direction to contact the other rotating body and is connected to the second brake member; and a third brake member that is connected to the second brake member; operating levers provided respectively and arranged opposite to each other; and the first operating lever.
an operating pin that contacts an operating lever of the first brake member to swing the operating lever; and a brake operating cam mechanism that displaces the operating pin toward the operating lever of the first brake member or in the opposite direction. By operating the brake operation cam mechanism and changing the displacement direction or displacement amount of the operation pin, only the operation lever of the first brake member is swung, and the first brake member is turned into a rotating body. The second brake member and the third brake member are rotated so that the second brake member and the third brake member are brought into contact with each other and separated from each other, and the second brake member's operation lever is swung together with the first brake member's operation lever. A plurality of braking forces can be applied to the pair of rotating bodies by making contact with and separating from the rotating bodies.

<Example> This example is a case in which this invention is applied to a brake device that applies brakes in four stages to a pair of VTR reel stands. FIGS. 1 to 4 are plan views of the brake devices provided on a pair of reel stands, each corresponding to four stages of brake operation states.

In the above figure, 1 and 2 are a pair of reel stands, respectively indicating a supply reel stand and a take-up reel stand. A supply brake member 3 is arranged on the supply reel stand 1, and take-up brake members 4 and 5 are arranged on the take-up reel stand 2. The supply brake member 3 consists of a rotatably supported brake lever 3a and an operating lever 3b integrally formed with the brake lever 3a. The take-up brake member 4 consists of a rotatably supported brake member 4a and an operating lever 4b integrally formed with the brake member 4a. Brake levers 3a and 4a are connected to spring 6 at one end.
, and are biased by the elasticity of the springs in the direction of contacting the supply reel stand 1 and the take-up reel stand 2, respectively. In this way, the supply brake member 3 and the take-up brake member 4 are connected by a single spring 6, thereby reducing the number of parts. Abutting portions 3c and 4c at each end of the operating levers 3b and 4b are opposed to each other, and an operating pin 7a of a brake operating lever 7, which will be described later, is arranged behind the abutting portion 3c that does not face the abutting portion 4c. ing. The take-up brake member 5 is for applying an auxiliary brake to the take-up reel stand 2.

The operating levers 3b and 4b are swung by moving the operating pin 7a, but the operating pin 7a
FIG. 5 shows the brake operating lever 7 with the attached brake operating lever 7 and the brake operating cam mechanism that swings the lever. A brake operating lever 7 and a cam 8 are arranged in this order below the supply brake member 3. The brake operating lever 7 is rotatably supported, and a spring 11 attached to one end connects a cam abutment pin 10a (described later) to the cam 8.
It is biased in the direction of contact. On the upper surface of the brake operating lever 7, an elastic plate 10 is swingably attached to which a cam abutting pin 10a that is brought into contact with the cam 8 is fixed. A guide protrusion 7c and a fixing protrusion 7b are provided on the upper surface of the brake operating lever 7, and a long hole 7d is formed.The cam contact pin 10a is inserted into the elongated hole 7d, and the guide protrusion 7c is provided. the elastic plate 10 around the fixing convex part 7b.
One end of the brake lever 7 is fixed to the brake operating lever 7.
The cam contact pin 10a passes through the long hole 7d and extends to the cam portion 9 of the cam 8. As described above, the cam contact pin 10a is brought into contact with the cam portion 9 by the spring 11. As the cam 8 rotates, the cam contact pin 10a moves while contacting the contact surface of the cam portion 9, and the brake operating lever 7 swings as the cam contact pin 10a moves. This swinging of the brake operating lever 7 causes the operating pin 7a to be displaced in the direction of pressing the operating lever 3b or in the direction of not pressing the operating lever 3b. Operation pin 7a
presses the operating lever 3b, and if the abutting portion 3c contacts the abutting portion 4c and then continues pressing, the operating lever 3b
At the same time, the operating lever 4b swings. In this way, the operation lever 3 is controlled by the action of the operation pin 7a.
b, 4b can be swung, but as will be described later, the supply brake member 3 and the take-up brake member are 4,5
The braking force can be changed, and the braking action can be applied to the pair of reel stands 1 and 2 in four stages. A plan view of the cam 8 is shown in FIG. When the cam 8 rotates around the central axis by a cam drive device (not shown), the cam contact pin 10a rotates around the central axis of the brake operating lever 7 along the shape of the cam portion 9 shown in the figure. When moving along the convex portion of the cam portion 9, the elastic plate 10 is bent and rotated while moving in the thickness direction of the brake operating lever 7.

The mounting structure of the winding brake members 4 and 5 will be explained with reference to FIG. Winding brake member 4
is pivotally supported by the rotating shaft 12 at a bearing portion 4d located approximately at the center of the brake lever 4a. The take-up brake member 5 has a substantially L-shape, and has a stopper portion 5a protruding from the back side of the end opposite to the side where the take-up reel stand 2 is braked. The bearing portion 5b of the winding brake member 5 is fitted and pivotally supported on the outside of the bearing portion 4d. A spring 13 is fitted on the outside of the bearing portion 5b, and both ends of the spring 13 are engaged with the brake lever 4a and the take-up brake member 5, respectively, to connect the take-up brake members 4 and 5. Also,
The take-up brake member 5 is biased by the spring 13 in the direction of contacting the take-up reel stand 2, but when the take-up brake member 4 rotates, it contacts the take-up reel stand 2 in the opposite direction of movement. They are arranged so that they approach or move away. A spring 1 is used to prevent these members from coming off above the rotating shaft 12.
3, fit the stopper 15 through the washer 14,
A stopper 15 is engaged with the head recess of the rotating shaft 12.

The braking operation of the brake device having the above configuration will be explained.

A cam 16 having a cam portion equivalent to the cam 8 of FIG. 6 is shown in FIG. This cam 16 is the cam part 9
A cam that develops the rotational motion of
Hereinafter, it will be explained with reference to FIGS. 1 to 4, assuming that the cam contact pin 10a moves due to the linear reciprocating movement of the cam 16. A schematic plan view and a schematic side view of the cam 16 are shown in FIG. 9 and FIG. 1, respectively.
As shown in the figure.

In order to perform the braking operation in four stages, the cam 16 is set with four positions L1 to L4 where the cam abutting pin 10a is stopped, and the wall material that moves the cam abutting pin 10a to each position is the cam. It is installed vertically on the board. Cam contact pin 10a is in position L1
When it is in contact with the surface 16a, it corresponds to the state shown in FIG. In this state, the brake operating lever 7
The operating pin 7a is not in contact with the operating lever 3b, so the supply brake member 3 and the take-up brake member 4 are urged against the supply reel stand 1 and the take-up reel stand 2, respectively, by the elasticity of the spring 6. are in contact. At this time, the take-up brake member 5 is separated from the take-up reel stand 2. That is, in this state, strong brakes are applied to both reel stands, and this corresponds to a stopped state of the VTR or a temporarily stopped state when returning from high-speed search mode to playback mode.

When the cam 16 is moved in the direction of arrow A from the state where the cam abutting pin 10a is at the above-mentioned position L1, the cam abutting pin 10a moves in the direction of arrow C along the slope 16b and reaches the position L2. Moving. When the cam contact pin 10a is located at this position L2, it corresponds to the state shown in FIG. As the cam contact pin 10a moves from position L1 to position L2, the brake operating lever 7 is swung by the cam 8, and the operating pin 7a
is displaced in the direction of pressing the operating lever 3b. In response to the pressing force of this operating pin 7a, the operating lever 3b
swings and rotates the brake lever 3a against the elasticity of the spring 6. As a result, the brake lever 3a separates from the supply reel stand 1, but since the contact portions 3c and 4c are not in contact with each other, the take-up reel stand 2 remains braked by the brake lever 4a. . In this state where the brake is applied only to the take-up reel stand 2,
This corresponds to the loading mode in which a tape is pulled out of a cassette in a VTR, or the unloading mode in which a tape is loaded into a cassette.

When the cam 16 is further moved in the direction of arrow A from the state where the cam contact pin 10a is at position L2,
The cam abutment pin 10a moves along the inclined surface 16c in the direction of arrow D and moves to position L3. The state in which the cam contact pin 10a is located at position L3 corresponds to FIG. Due to this movement of the cam contact pin 10a, the operating pin 7a is further moved from the state shown in FIG. 2 to the operating lever 3.
b is displaced in the direction of pressing. In response to the pressing force at this time, the operating lever 3b further swings, and the abutting portion 3c abuts the abutting portion 4c. Due to this contact, the operating lever 4b swings together with the operating lever 3b, and thereby the winding brake member 4 is moved by the spring 6.
It rotates in a direction away from the take-up reel stand 2 against the elasticity of the take-up reel stand 2. In this state, the supply brake member 3
The brake by the take-up brake member 4 does not apply to each reel stand, and the brake by the take-up brake member 5 as an auxiliary brake has never been used before. This state corresponds to the playback mode of a VTR. Incidentally, it is also possible to use this state in which the brakes are not applied to either reel stand for fast forwarding or rewinding mode of the VTR.

When the cam 16 is further moved in the direction of arrow A, the cam contact pin 10a moves in the direction of arrow E along the inclined surface 16d, and reaches position L4 beyond the wall material of the inclined surface 16d. The state in which the cam contact pin 10a is located at position L4 corresponds to FIG. When the cam contact pin 10a is moved from the position L3 to the position L4, the operating pin 7a is further displaced from the state shown in FIG.
b is pressed, the take-up brake member 4 is rotated in a direction away from the take-up reel stand 2 and the take-up brake member 5 is brought into contact with the take-up reel stand 2. As described above, when the cam contact pin 10a is moved from the position L2 to the position L3, the take-up brake member 5 also rotates by the rotation angle of the brake lever 4a at that time, but it does not come into contact with the take-up reel stand 2. By moving from position L3 to position L4, the take-up brake member 5 rotates further and finally comes into contact with the take-up reel stand 2. At this time, a braking force is applied to the take-up reel stand 2 by the action of the spring 13, but a braking force weaker than the braking force exerted by the brake lever 4a in the states shown in FIGS. 1 and 2 acts as an auxiliary brake. This state corresponds to a VTR's high-speed search, fast forward, or rewind mode.

Next, the cam contact pin 1 is attached to the stop surface 16e at position L4.
When the cam 16 is moved in the direction of arrow B in the opposite direction to that described above from the state where 0a is stopped, the cam contact pin 10a comes off the stop surface 16e and suddenly moves to position L1 along the direction of arrow F. do. This movement releases the pressing force from the operating pin 7a, so
The supply brake member 3 and the take-up brake member 4 are swung in the direction of contacting each reel stand by the action of the spring 6, and the take-up brake member 4 is swung by the action of the spring 13.
The take-up brake member 5 connected to the take-up brake member 5 rotates in the same direction as the take-up brake member 4, but moves away from the take-up reel stand 2. Therefore, the fourth
The state in which the auxiliary brake is applied by the take-up brake member 5 in the figure suddenly returns to the state in FIG. 1 in which strong brakes are applied to both reel stands.
When the cam 16 is further moved in the direction of arrow B,
The cam contact pin 10a moves in the direction of arrow G along the inclined surface 16f, and moves from position L1 to position L3. By this movement, the state in which strong brakes are applied to both reel stands as shown in FIG. 1 changes to the state in which the brakes are not applied as shown in FIG. 3. A slope 17 is formed between the wall materials forming the slopes 16d and 16f, and the slope 17 is raised toward position L3 with respect to the cam board plane, and the cam contact pin 10a is attached to an elastic plate along this slope 17. It moves while bending 10. The cam contact pin 10a has an inclined surface 16
f, and reaches position L3 through a gap between wall materials forming slopes 16d and 16f in the vicinity of position L3. In this way, since the slope 17 becomes higher as it approaches the position L3, a slope in the same direction as the slope 16d is also formed in the gap between the wall materials forming the slopes 16d and 16f, and the cam When the abutting pin 10a moves in the direction of arrow E, it can move along the inclined surface 16d without falling toward the inclined surface 16f. When the cam 16 is further moved in the direction of arrow B from the state where the cam contact pin 10a is at position L3, it moves in the opposite direction to arrows D and C, and returns to position L1 via position L2.

When changing from the state shown in Figure 1 to the state shown in Figure 4,
The cam 16 is moved in the direction of arrow B to rapidly move the cam contact pin 10a from position L1 to position L4. That is, when the cam contact pin 10a is moved in the direction of the arrow H along the inclined surface 16g, it reaches the stop surface 16h corresponding to the position L4. vice versa,
In order to rapidly return the stop surface 16h from the position L4 to the position L1, the cam 16 is moved in the direction of the arrow A. Due to its movement, the cam abutment pin 1
0a moves from the stop surface 16h along the direction of arrow I to the wall material surface 16a at position L1. This position L
1, the state shown in FIG. 4 suddenly returns to the state shown in FIG. Furthermore, when the above return operation is performed, the cam abutment pin 10a is moved between the inclined surfaces 16b and 16g while remaining in the position L1 in order to perform the next braking operation. That is, after moving from the direction of arrow I to position L1,
Furthermore, the cam 16 is moved in the direction of arrow A, and the cam contact pin 10a is moved in the direction of arrow J. A slope 18 inclined with respect to the plane of the cam substrate is formed between the wall material forming the slope 16g and the wall material forming the surface 16a, and the slope 18 is elevated in the direction of arrow B. The wall material of the inclined surface 16g is notched near the position L1, and the cam contact pin 1
0a can move to the front of the slope 16b through the notch in the wall material of the slope 16g while bending the elastic plate 10 along the slope 18. Figure 10 shows elastic plate 1
0 is the cam contact pin 10a at the upper end of the bending slope 18.
Indicates that the is moving. Since a step is formed around the notch in the wall material of the inclined surface 16g and at the upper end of the inclined surface 18, when the cam contact pin 10a moves in the direction of arrow H, it falls toward the inclined surface 18 side. It is possible to move in the direction of arrow H along the slope of the stepped portion without any trouble.

The above cam operation moves the cam contact pin 10a to position L.
1 to L4 and swing the brake operating lever 7, the operating lever 3b is moved in accordance with the displacement of the operating pin 7a, or the operating lever 3b is
1 to 4 by moving the operating lever 4b.
Any of the braking conditions shown in the figure can be obtained.
By simply swinging the operating levers 3b and 4b in this manner, the braking force can be changed in four stages. Furthermore, by determining the cam structure of the brake operation cam mechanism for displacing the operation pin 7a, the brake operation can be set arbitrarily. Furthermore, since the single brake operation cam mechanism only displaces the operation pin 7a, there is no need to provide a brake device corresponding to each brake force, which simplifies the brake mechanism and reduces the number of parts. This will reduce costs.

In addition, as mentioned above, the cam contact pin 1 is located at position L3.
The cam abutting pin 10a can be moved to fast forward or rewind mode in the state shown in FIG. 3 by moving the cam contact pin 10a from position L1 to position L3.
9 and 10 to move the
As shown by the two-dot chain line in the figure, the distance of the slope 16g is shortened, a wall material 19 corresponding to the position L3 is provided near the end thereof, and a slope 20 smaller than the slope 18 is provided as the wall material 19 is arranged. establish.

<Effects of the invention> As explained above, according to this invention, the operation pin is displaced by the cam drive control of the brake operation cam mechanism, and the amount or direction of the displacement is changed, thereby controlling the first brake member. By moving the control lever independently, the braking force of the first brake member can be applied to one rotating body, and by swinging the control lever of the second brake member together with the control lever, the second brake can be applied. A braking force can be applied to the other rotating body by each of the third brake member connected to the third brake member and the second brake member. As a result, by simply providing one brake operation cam mechanism that swings each operation lever with an operation pin, it is possible to switch the brake state to multiple stages according to the cam structure, so the brake can be adjusted to suit each brake force. There is no need to provide a mechanism, the brake device can be easily constructed, and the number of parts can be reduced to achieve lower prices.

[Brief explanation of the drawing]

FIGS. 1 to 4 are plan views of a brake device in which this invention is applied to a pair of reel stands of a VTR, each showing a braking state by the brake device. 5 is an exploded perspective view of the brake operating cam mechanism used in the brake device, FIG. 6 is a plan view of the cam 8 of the brake operating cam mechanism, and FIG. 7 is a take-up brake member 4, 5 of the brake device. FIG. 8 is a perspective view of the cam 16 when the cam 8 is expanded into linear motion, FIG. 9 is a schematic plan view of the cam 16, and FIG. 10 is a schematic side view of the cam 16. It is a diagram. DESCRIPTION OF SYMBOLS 1... Supply reel stand, 2... Take-up reel stand, 3... Supply brake member (as a first brake member), 4... Take-up brake member (as a second brake member), 5... ...roll-up brake member (as a third brake member), 6
...(biasing the supply brake member 3 and the take-up brake member 4 in the direction of contacting each rotating body)
Spring, 7... Brake operation lever, 7a... Operation pin, 8... Cam (of the brake operation cam mechanism),
13...A spring (which connects the take-up brake member 4 and the take-up brake member 5).

Claims (1)

[Claims for Utility Model Registration] (1) A brake device that brakes or stops each of two rotating bodies in multiple stages, which is biased by an elastic body in the direction of contacting one of the rotating bodies, and a first brake member rotatably supported; a second brake member biased by an elastic body in a direction to contact the other rotating body and rotatably supported; and the other rotating body. The second brake member is biased by an elastic body in a direction to contact the other rotating body so that the second brake member approaches or moves away from the other rotary body in a direction opposite to the direction in which the second brake member moves. a third brake member connected to the first brake member; an operation lever provided on each of the first brake member and the second brake member and arranged to face each other; and operation of the first brake member. The brake operation includes an operation pin that contacts a lever and swings the operation lever, and a brake operation cam mechanism that displaces the operation pin toward the operation lever of the first brake member or in the opposite direction. By operating the cam mechanism and changing the displacement direction or displacement amount of the operating pin, only the operating lever of the first brake member is swung, and together with the operating lever of the second brake member, the operating lever of the second brake member is also oscillated. A brake device that is configured to swing to switch braking operations by the first brake member, the second brake member, and the third brake member. (2) The brake device according to claim 1, wherein the first brake member and the second brake member are urged by one elastic body in a direction in which they come into contact with each rotating body.