JPH0619873B2 - Magnetic recording / reproducing device friction device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction device of a magnetic recording / reproducing device.

Configuration of Conventional Example and Problems Thereof A friction device used for a magnetic tape take-up reel of a conventional magnetic recording / reproducing apparatus will be described with reference to FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of a friction device of a conventional magnetic recording / reproducing device, FIG. 2 is a sectional view of the device, and FIG. 3 is a partial side view of a rotating body of the device. In the figure, 1 is a protrusion piece 1a, 1
It is a first arm having b and 1c and having a boss portion 1d which serves as a fulcrum of rotation. 2 is a concave portion 2a, 2b and a protruding piece 2
It is a second arm that has c and has a rotation shaft 2e on the boss portion 2d. Reference numeral 3 is a tension spring that connects the protruding piece 1c of the first arm 1 and the protruding piece 2c of the second arm 2. The projecting pieces 1a, 1b of the first arm 1 are arranged so that the first arm 1 and the second arm 2 slide relative to each other in the front-back direction indicated by the arrow A direction.
And the recesses 2a, 2b of the second arm 2 are engaged with each other,
The first arm 1 and the second arm 2 form a first rotating body. Reference numeral 4 denotes a friction member (hereinafter referred to as a felt) made of a felt adhered to the friction surface of the second arm 2.

Reference numeral 5 denotes a second rotating body that is fitted to the rotating shaft 2e of the second arm 2, has a bearing portion 5a, is rotatably supported by the second arm 2, has a rubber tire 5b on the outer periphery, and has a spring. It has a recess 5c that engages with the projecting piece 7a of the spring receiving ring 7 as a receiving member. The rotating body 5 is in contact with the second arm 2 via the felt 4.

Reference numeral 6 denotes a compression spring which is arranged outside the bearing portion 5a of the rotating body 5 and which is interposed between the rotating body 5 and the spring receiving ring 7, presses the rotating body 5 against the felt 4, and The ring 7 is biased in the axial direction of the rotation shaft 2e of the second arm 2. Reference numeral 8 denotes a polyslider washer as a slip member, which is rotatably fitted onto the rotary shaft 2e of the second arm 2 and is arranged between the E ring 9 and the spring bearing ring 7. Also, the E-ring 9 as the engaging member is the second
Engages with the groove portion 2f of the arm 2 and receives the biasing force of the compression spring 6.

The operation of the friction device of the magnetic recording / reproducing apparatus configured as described above will be described below.

As shown in FIG. 2, a drive source (not shown) is rotatably supported by a fixed shaft 11 planted in a substrate 10 such as a sheet metal.
By bringing the drive reel 12 rotated by the contact with the rubber tire 5b of the rotating body 5 by the load of the tension spring 3,
The rotating body 5 rotates about the rotating shaft 2e of the second arm. Further, the first arm 1 and the second arm 2 are rotated about the fixed shaft 11 by using the frictional force with the felt 4, and the rubber tire 5b is brought into contact with the load reel 22 to rotate the load reel 22. . Here, when the load applied to the load reel 22 becomes large, the rotating body 5 slips with the felt 4, so that the load reel 22 cannot rotate.

However, in such a conventional friction device, as shown in FIG. 3, the circumferential length l ₁ of the concave portion 5c of the rotating body 5 and the circumferential length l of the projecting piece 7a of the spring bearing ring 7 are shown. ₂ is different and there is a gap between the recess 5c and the projecting piece 7a. Therefore, when the rotating body 5 is rotated, the projecting piece 7a of the spring receiving ring 7 comes into contact with the end surface of the recess 5c of the rotating body 5 and causes abnormal noise. There was a drawback that occurred.

An object of the present invention is to eliminate such drawbacks, and it is an object of the present invention to provide a friction device of a magnetic recording / reproducing apparatus in which abnormal noise does not occur.

To achieve the above object, the present invention provides a first rotating body, which is rotatably supported by a fixed shaft embedded in a substrate and has a rotating shaft extending parallel to the fixed shaft, and the first rotating body. A second rotating body that is rotatably fitted around the rotating shaft of the rotating body and has a friction surface that can contact the friction surface of the first rotating body via a friction member; and an axial direction of the rotating shaft. A slip member that is movably fitted on the outside, an engagement member that engages with the rotating shaft, and an outside member that is fitted on the rotating shaft so as to be movable in the axial direction and rotatable about the axis, and to have the second rotation. A spring bearing member that is held by the elastic force of an engaging portion of the body and is rotatable integrally with the second rotating body; and is interposed between the spring receiving member and the second rotating body, and While biasing the spring receiving member and the slip member toward the engaging member, , And a spring for urging the second rotating body toward the friction member. According to this, the spring receiving member is held by the elastic force of the engaging portion of the second rotating body, so that no abnormal noise is generated even when the second rotating body is rotated.

Description of Embodiments A first embodiment of the present invention will be described below with reference to FIGS. 4 to 6.

FIG. 4 is an exploded perspective view of a friction device of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention, FIG. 5 is a sectional view of the apparatus, and FIG. 6 is a partial side view of a rotating body of the apparatus. is there.

In the figure, reference numeral 1 is a first arm having projecting pieces 1a, 1b, 1c and a boss portion 1d serving as a fulcrum of rotation. Reference numeral 2 is a second arm having concave portions 2a and 2b and a protruding piece 2c, and having a rotating shaft 2e on a boss portion 2d. Reference numeral 3 is a tension spring that connects the protruding piece 1c of the first arm 1 and the protruding piece 2c of the second arm 2. The protruding piece 1 of the first arm 1 is arranged so that the first arm 1 and the second arm 2 slide in the direction A.
a, 1b and the recesses 2a, 2b of the second arm 2 are engaged with each other and these first arm 1 and second arm 2
Thus, the first rotating body is configured. Reference numeral 4 is a felt (friction member) bonded to the friction surface of the second arm 2.

Reference numeral 5 denotes a second rotating body that fits on the rotating shaft 2e of the second arm 2, has a bearing portion 5a, is rotatably supported by the second arm 2, and has a rubber tire 5b on the outer circumference. . The circumferential length l ₂ of the protruding piece 7a of the spring bearing ring 7 as the spring bearing member is equal to the circumferential length l of the recess 5c of the rotating body 5.
_It is larger than ₁ . In addition, the concave portion 5c of the rotating body 5
A cutout portion 5d is formed in the vicinity of, and thereby a protruding piece portion 5f is formed. Here, when the protrusion 7a of the spring receiving ring 7 is to be engaged with the recess 5c of the rotating body 5,
The protruding piece 5f is deformed to obtain elastic force. By this elastic force, the projecting piece 7a of the spring receiving ring 7 is sandwiched in the recess 5c of the rotating body 5.

Reference numeral 6 denotes a compression spring arranged outside the bearing portion 5a of the rotating body 5, which is interposed between the rotating body 5 and the spring receiving ring 7 and presses the rotating body 5 against the felt 4 and the spring receiving ring 7 Is urged in the axial direction of the rotating shaft 2e of the second arm 2. Further, due to the biasing force of the compression spring 6, the projecting piece 7a of the spring receiving ring 7 is opposed to the elastic force of the projecting piece portion 5f of the rotating body 5 by the projecting piece portion 5f of the rotating body 5 and the side wall portion 5e. It is movable in the axial direction of the bearing portion 5a of the rotating body 5 while being regulated.

Reference numeral 8 denotes a polyslider washer as a slip member rotatably fitted on the rotary shaft 2e of the second arm 2 and
It is arranged between the E-ring 9 and the spring receiving ring 7 as an engaging member engaged with the notch 2f provided in the vicinity of the tip of the rotary shaft 2e of the arm 2.

Next, the operation of this device will be described.

As shown in FIG. 5, a drive source (not shown) is rotatably supported by a fixed shaft 11 planted in a substrate 10 such as a sheet metal.
By bringing the drive reel 12 rotating by the above into contact with the rubber tire 5b of the rotating body 5 by the load of the tension spring 3, the rotating body 5 rotates about the rotating shaft 2e of the second arm 2. Further, the rotating body 5 uses the frictional force with the felt 4 to rotate the first arm 1 and the second arm 2 about the fixed shaft 11. Further, since the rubber tire 5b is in contact with the load reel 22, the load reel 22 is rotated. However, when the load applied to the load reel 22 becomes large, the rotating body 5 slips with the felt 4, so that the mechanism does not rotate in conjunction with the load reel 22.

Here, the projecting piece 7a of the spring receiving ring 7 and the recess 5c of the rotating body 5 are engaged with each other such that the projecting piece 7a is sandwiched by the deforming elastic force of the projecting piece portion 5f. Therefore, even if the rotating body 5 is rotated, no abnormal noise is generated.

In this embodiment, the protruding piece 5f of the rotating body 5 is located only on one side of the recess 5c, but the protruding piece 5f may be provided on both sides of the recess 5c of the rotating body 5. Also,
In this embodiment, the concave portion 5c of the rotating body 5 and the two protruding pieces 7a of the spring receiving ring 7 engaging with the concave portion 5c are provided, but one or a plurality of them may be provided.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 7 is an exploded perspective view of a friction device according to a second embodiment of the present invention, and FIG. 8 is a partial side view of the device.

In the figure, 1 is a first arm, 2 is a second arm,
3 is a tension spring, 4 is a felt, 6 is a compression spring, 8 is a polyslider washer, 9 is an E-ring, and above is the fourth.
The configuration is similar to that shown in the figure. What differs from the configuration shown in FIG. 4 is the engaging portion between the rotating body 5 and the spring receiving ring 7, which is modified as shown in FIG. In FIG. 8, the rotating body 5 is formed with projecting piece portions 5g so as to sandwich the concave portion 5h. A recess 7b is formed around the circumference of the spring receiving ring 7. Here, the circumferential length l ₁ of the two projecting piece portions 5g sandwiching the recess 5h is set longer than the circumferential length l _{2 of} the recess 7b formed in the spring receiving ring 7. . When trying to engage the spring receiving ring 7 with the rotating body 5, the two projecting piece portions 5g are deformed in the direction of the recessed portion 5h by the side surfaces of the recessed portion 7b, and the recessed portion 7b is held by the elastic restoring force of the projecting piece portion 5g. .

In the friction device of the second embodiment configured as described above, even if the rotating body 5 is rotated, the concave portion 7b of the spring receiving ring 7 is held by the protruding piece portion 5g of the rotating body 5, so that the concave portion is formed. The protruding piece 5g does not move within 7b, and no abnormal noise is generated.

In addition, in the second embodiment, two protruding piece portions 5g are provided, but one or a plurality of protruding piece portions 5g may be provided.

EFFECTS OF THE INVENTION As is clear from the above description, according to the invention, the spring receiving ring is held by the elastic force of the rotating body, so that no abnormal noise is generated even when the rotating body is rotated.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a friction device of a conventional magnetic recording / reproducing device, FIG. 2 is a sectional view of the device, FIG. 3 is a partial side view of the device, and FIG. 4 is a first embodiment of the present invention. An exploded perspective view of a friction device of a magnetic recording / reproducing device in an example, FIG. 5 is a sectional view of the device, and FIG. 6 is a partial side view of the device.
FIG. 7 is an exploded perspective view of a friction device of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention, and FIG. 8 is a partial side view of the same. 1 ... 1st arm (1st rotary body), 2 ... 2nd arm (1st rotary body), 2e ... Rotation axis, 4 ... Felt (friction member), 5 ... 2nd Rotating body, 5c ...
5e ... Side wall portion, 5f ... Projecting piece portion, 5h ... Recessed portion, 5g
...... Projection piece, 6 ... Compression spring, 7 ... Spring receiving ring (spring receiving member), 7a ... Projection piece, 7b ... Recess, 8 ...
... Poly slider washer (slip member), 9 ... E ring (engaging member), 10 ... Substrate, 11 ... Fixed shaft

Claims (1)

[Claims] 1. A first rotating body, which is rotatably supported by a fixed shaft embedded in a substrate and has a rotating shaft extending parallel to the fixed shaft, and is rotatable about a rotating shaft of the first rotating body. A second rotating body having a friction surface that is externally fitted to the friction surface of the first rotating body via a friction member, and a slip that is externally fitted to the rotation shaft so as to be axially movable. A member, an engaging member that engages with the rotating shaft, and an elastic force of an engaging portion of the second rotating body that is externally fitted to the rotating shaft so as to be movable in the axial direction and rotatable about the axis. And a spring receiving member which is held by the second rotating body so as to be rotatable integrally with the second rotating body, and which is interposed between the spring receiving member and the second rotating body to connect the spring receiving member and the slip member. The second rotating body is urged toward the engaging member, and the second rotating body is moved toward the friction portion. Friction device of a magnetic recording and reproducing apparatus comprising a spring for biasing the.