JPH0731385Y2 - Pinch roller support device - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Application Field The present invention relates to recording and / or recording using a tape body as a recording medium.
Alternatively, the present invention relates to a pinch roller supporting device that supports a pinch roller in a reproducing device or the like.

B. Outline of the Invention The present invention uses a tape body as a recording medium for recording and / or recording.
Further, in a pinch roller supporting device such as a reproducing device, a torsion coil spring locked near the rotation axis of a pinch roller pivotally supported at the tip of a rotatably supported first lever is rotatably supported. The pinch roller can be moved by a compact structure without elastically increasing the elastic force of the torsion coil spring by elastically urging the pinch roller by elastically deforming it by the rotating operation means via the second lever. The amount of the pinch roller is increased and the pinch roller is satisfactorily pressed against the capstan shaft.

C. Conventional Technology Conventionally, like so-called tape recorder, video tape recorder or digital audio tape recorder, etc.,
In a recording and / or reproducing apparatus using a tape body as a recording medium, a capstan shaft rotatably driven at a predetermined speed and a pinch roller rotatably supported in order to run the tape body. It is designed to be sandwiched between.

The capstan shaft is made of a hard material such as metal, and the pinch roller is made of a material capable of increasing the surface friction coefficient as much as possible, such as rubber.

Then, the pinch roller is rotated by a frictional force between the pinch roller and the capstan shaft by being pressed against the capstan shaft with a predetermined pressure force. Therefore, the tape body sandwiched between the capstan shaft and the pinch roller is operated to run.

By the way, as a pinch roller supporting device for supporting the pinch roller and pressing it to the capstan, as shown in FIG. Supported lever member 1
Those having 02 have been proposed. This lever member
A pinch roller 103 is rotatably attached to the tip of the 102. A torsion coil spring 104 is wound around the rotating shaft 101. This torsion coil spring 104
Is a locking claw 102 of which one end is provided on the lever member 102.
It is locked to a and the other end is locked to a locking member 105 provided on the chassis. The lever member 102 is elastically biased by the torsion coil spring 104 in a direction in which the pinch roller 103 is pressed against the capstan shaft 106, as indicated by an arrow a in FIG.

Due to this urging force, the pinch roller 103 is pressed against the capstan shaft 106, the tape body T is sandwiched between the pinch roller 103 and the capstan shaft 106, and the tape body T is operated.

Further, as shown in FIG. 7, the torsion coil spring 104
Instead of the above, the coil spring 1 is pulled between the locking claw 102a of the lever member 102 and the locking pin 107 provided on the chassis.
A pinch roller supporting device in which 08 is stretched is also proposed.

In this pinch roller supporting device, the lever member
As indicated by an arrow b in FIG. 7, 102 is elastically biased in a direction in which the pinch roller 103 is pressed against the capstan shaft 106 by the elastic force of the tension coil spring 108. Then, the pinch roller 103 and the capstan shaft 106
The tape body T is sandwiched between and to be operated.

D. Problem to be Solved by the Invention By the way, the pinch roller needs to be separated from the capstan shaft in the so-called fast-forward mode and rewind mode. That is, it is necessary to move the pinch roller.

Further, in a recording and / or reproducing apparatus configured to perform recording and / or reproducing by a so-called rotary head device, a tape body housed in a tape cassette or the like is pulled out from the tape cassette, and the rotary head device is It is wound around the component drum device. Therefore, in such a recording and / or reproducing apparatus, the tape cassette accommodating the tape body and the capstan shaft are largely separated from each other, and the pinch roller needs to be largely moved.

In the pinch roller supporting device shown in FIGS. 6 and 7 as described above, the pinch roller 103 is replaced by the capstan shaft 106.
If it is attempted to move the lever member 102 further apart, the lever member 102 is rotated against the biasing force of the torsion coil spring 104 or the tension coil spring 108.

Therefore, in this pinch roller supporting device, a sufficient amount of movement is ensured, and when the pinch roller contacts the capstan shaft, the pinch roller is pressed against the capstan shaft by a predetermined pressing force. In order to achieve this, the spring coefficient of the torsion coil spring 104 or the tension coil spring 108 must be increased.

Therefore, these springs are increased in size, and the device for rotating the lever member against the biasing force of these springs is increased in size, which makes it difficult to reduce the size of the device.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and a sufficient amount of movement of the pinch roller is ensured without increasing the size of the device configuration, and the pinch roller is favorably attached to the capstan. An object is to provide a pinch roller supporting device that is crimped.

E. Means for Solving the Problems In order to solve the above problems and achieve the above objects, a pinch roller supporting device according to the present invention has a base end rotatably supported and a pinch roller pivotally supported at the front end. Has a first lever and a projecting piece whose base end is rotatably supported and comes into contact with the first lever, and is restricted from rotating in one direction with respect to the first lever. The second lever and the second lever supported on the first lever, one end of which is locked in the vicinity of the rotation axis of the pinch roller and the other end of which is engaged with the protrusion of the second lever. A torsion coil spring that restricts rotation in the other direction, and rotation operation means that is operated by a drive device to rotate the second lever. The rotation operation means includes the second The pinch roller can be moved to the capstan shaft by rotating the lever in the other direction. The pinch roller is moved toward the capstan shaft and the second lever is rotated against the biasing force of the torsion coil spring after the pinch roller abuts the capstan shaft. It is characterized by being crimped.

F. Action In the pinch roller supporting device according to the present invention, the pinch roller pivotally supported at the tip of the first lever has a torsion coil spring whose one end is locked near the rotation axis of the pinch roller. Since it is pressed against the capstan shaft by being elastically displaced through the protrusion of the second lever by the operating means, the rotary shaft of the pinch roller and the protrusion are not affected by the elastic force of the torsion coil spring. The pressure force of the pinch roller to the capstan shaft can be adjusted by adjusting the distance.

Further, by rotating the first lever and the second lever so as to follow each other, the pinch roller can be moved without displacing the torsion coil spring, so that the amount of movement of the pinch roller is increased. be able to.

G. Embodiment Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a pinch roller supporting device according to the present invention has a base end rotatably supported by a support shaft 1 which is set up on a chassis (not shown) of a recording and / or reproducing device. It has a first lever 2 and a second lever 3.

On the surface side of the tip of the first lever 2, the support shaft 1 is provided.
A rotary shaft 4 parallel to the axis is erected, and a pinch roller 5 is rotatably supported at the tip end side of the rotary shaft 4.
The pinch roller 5 is formed in a cylindrical shape from a predetermined material such as rubber which can increase the friction coefficient of the surface.

Further, on the one surface side of the front end portion of the first lever 2,
A locking projection 2a is provided in the vicinity of the rotary shaft 4 so as to project.

The second lever 3 is formed shorter than the first lever 2 and is arranged on the back surface side of the first lever 2. On the other surface side of the tip portion of the second lever 3, a projecting piece 3a is provided so as to project. That is, this protrusion 3a
Has one side facing the other side edge of the first lever 2 and a tip protruding beyond the surface of the first lever 2. Therefore, in the second lever 3, one side portion of the projecting piece 3a comes into contact with the other side edge of the first lever 2, so that the second lever 3 is indicated by P in FIG. 1 with respect to the first lever. The rotation in one direction shown is restricted.

A torsion coil spring 6 serving as an elastic member is wound around the base end of the rotary shaft 4. The torsion coil spring 6 has one end side locked by the locking protrusion 2a and the other end side engaged by the protruding piece 3a. On the other end side of the torsion coil spring 6, as shown by an arrow P in FIG. 1, one side portion of the projecting piece 3a presses the other side edge of the first lever 2 as shown by an arrow P in FIG. It urges the second lever 3 in the other direction and restricts the rotation of the second lever 3 in the other direction with respect to the first lever 2.

Further, on the other side of the back surface of the middle portion of the second lever 3,
The pressed pin 3b is planted. This pressed pin 3b is
Due to the contact / separation operation of the pinch roller 5 with respect to the capstan shaft 16, a cam piece 17 serving as a rotating operation means driven and operated by a predetermined driving device (not shown) comes into contact to rotate the second lever 3. It is for doing.

As shown in FIG. 5, the pinch roller supporting device according to the present invention constructed as described above is used for the rotary drum device 11 constituting the rotary head device by pulling out the tape body T stored in the tape cassette 10. When applied to a recording and / or reproducing device configured to perform recording and / or reproducing by winding, during so-called tape loading,
The first and second levers 2 and 3 are each rotated by a predetermined angle so that the pinch roller 5 contacts the capstan shaft 16 from a position within the tape cassette 10 as shown by an arrow L in FIG. It is moved to the contact position. Each of the above levers
The cam pieces 17 are driven and operated in accordance with the mode switching of the recording and / or reproducing apparatus, so that the pressed pins 3b are pressed in the rotating directions of the levers 2 and 3 to rotate the levers 2 and 3. Is done by doing.

Further, in this recording and / or reproducing apparatus, a plurality of tape guide bodies 12, 13, 14, 15 are respectively indicated by arrows l in FIG.
_{As shown by 1} , l ₂ , l ₃ and l ₄ , by a predetermined moving operation device,
This tape cassette from the position inside the tape cassette 10
It is moved to a position outside 10 to guide the tape body T to a predetermined tape running path.

That is, in the recording and / or reproducing apparatus, the pinch roller supporting device is arranged such that the pinch roller 5 is sufficiently separated from the capstan 16 when the tape cassette 10 is loaded, as shown in FIG. I am letting you. At this time, the first lever 2 and the second lever 3 are moved by the urging force of the torsion coil spring 6 into the protrusion 3a.
Since one side portion of the first lever 2 is pressed against the other side edge of the first lever 2, they are held in a state of overlapping each other.

And in the so-called tape loading mode,
When the pressed pin 3b is pressed, the second lever 3
Is rotated, the first lever 2 is rotated together with the second lever 3, and the pinch roller 5 approaches the capstan shaft 16 as indicated by an arrow L in FIG. It is operated to move.

The recording and / or reproducing device is set to a mode such as a so-called fast-forward reproducing mode or a pause mode in which the tape body T is not synchronized with the rotation of the capstan shaft 16 in a state where the tape loading is completed. In this case, as shown in FIG. 3, the pinch roller 5
Are located in the vicinity of the capstan shaft 16 but are not in contact with each other. Therefore, the torsion coil spring 6 does not elastically displace, and the first and second levers do not move.
The positional relationship between each other is maintained.

Then, when the recording and / or reproducing apparatus is set to a mode for controlling the traveling speed of the tape body T by the rotation speed of the capstan shaft 16 like the recording or reproducing mode, the levers 2, When 3 is further rotated, the pinch roller 5 contacts the capstan shaft 16.

Further, as indicated by an arrow Q in FIG. 4, the pressed pin 3b is pressed in the rotating direction of the levers 2, 3, and at this time, the first lever 2 moves the pinch roller 5 and the pinch roller 5 moves. Since the rotation is blocked by being in contact with the capstan shaft 16, only the second lever 3 is further rotated by a predetermined angle. Then, the other side portion of the protruding piece 3a of the second lever 3 presses the other end side of the torsion coil spring 6 to elastically displace the torsion coil spring 16. The pinch roller 5 is pressed against the capstan shaft 16 by the elastic force of the torsionally-displaced torsion coil spring 16. Then, the tape body T is sandwiched between the pinch roller 5 and the capstan shaft 16 and operated for traveling.

The capstan shaft 16 of the pinch roller 5 at this time
The crimping force against is the distance x between the support shaft 1 and the projecting piece 3a indicated by X in FIG. 4 and the support shaft 1 indicated by Y in FIG.
And the distance y between the rotary shaft 4 and the rotary shaft 4 are determined. That is, when the material of the wire forming the torsion coil spring 6 and the conditions such as the wire diameter are the same, the smaller the difference between the distance x and the distance y, the more the crimping of the pinch roller 5 to the capstan shaft 16 is performed. Power increases. On the contrary, the larger the difference between the distance x and the distance y, the smaller the pressure bonding force.

That is, in this pinch roller supporting device, the pinch roller 5 can be pressed against the capstan shaft 16 with a sufficient pressing force without increasing the elastic force of the wire forming the torsion coil spring 6. .

Further, the position where the protruding piece 3a is provided is not limited to the tip end portion of the second lever 3, and may be the middle portion of the second lever 3. Further, the projecting piece 3a is provided on the side portion of the second lever 3 and contacts the side edge portion of the first lever 2 to restrict the rotation of the second lever 3. However, the rotation of the second lever 3 is not limited to the above, but a hole is formed in the first lever 2 in the direction of rotation so that the second lever 3 is fitted into the hole and abuts on the peripheral edge of the hole. It may be configured to regulate.

Further, the first lever 2 and the second lever 3 do not have to be supported by the same support shaft, but are configured to be rotatably supported by separate support shafts. Good.

H. Effect of the Invention As described above, in the pinch roller supporting device according to the present invention, the pinch roller pivotally supported at the tip of the first lever locks one end near the rotation axis of the pinch roller. The twisted coil spring is elastically displaced by the rotating operation means via the projecting piece of the second lever, so that the torsion coil spring is crimped to the capstan shaft.

Therefore, without depending on the elastic force of the torsion coil spring,
By adjusting the distance between the rotary shaft of the pinch roller and the projecting piece, the pressing force of the pinch roller with respect to the capstan shaft can be adjusted without increasing the size of the torsion coil spring.
The pinch roller can be satisfactorily pressed against the capstan shaft.

Further, by rotating the first lever and the second lever while following each other, the pinch roller can be moved without elastically displacing the torsion coil spring.

Therefore, the amount of movement of the pinch roller can be easily increased, which is suitable for application to, for example, a recording and / or reproducing apparatus using a rotary head device.

That is, according to the present invention, without increasing the size of the device configuration,
It is possible to provide a pinch roller supporting device in which a sufficient amount of movement of the pinch roller is ensured and the pinch roller is satisfactorily pressed against the capstan.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a pinch roller supporting device according to the present invention. FIG. 2 is a plan view showing a state in which the pinch roller of the pinch roller supporting device is separated from the capstan shaft,
FIG. 3 is a plan view showing a state in which the pinch roller of the pinch roller supporting device is moved and operated in the vicinity of the capstan shaft, and FIG. 4 is a pinch roller of the pinch roller supporting device press-bonded to the capstan shaft. It is a top view showing the state where it was opened. FIG. 5 is a schematic plan view illustrating an example of a tape body traveling path of a recording and / or reproducing apparatus to which the pinch roller supporting device is applied. FIG. 6 is a plan view showing the structure of a conventional pinch roller supporting device, and FIG. 7 is a plan view showing another example of the structure of the conventional pinch roller supporting device. 2 …… First lever 3 …… Second lever 3a …… Projection piece 4 …… Rotary shaft 5 …… Pinch roller 6 …… Torsion coil spring 16 …… Capstan shaft 17 …… Cam piece

Claims (1)

[Scope of utility model registration request] 1. A first lever having a base end rotatably supported and a pinch roller pivotally supported at a tip end, and a base end rotatably supported to contact the first lever. A second lever having a contacting piece and restricted from rotating in one direction with respect to the first lever; and a rotation shaft of the pinch roller having one end side supported on the first lever. A torsion coil spring that is locked in the vicinity and that controls the other end of the second lever to rotate in the other direction by engaging the protrusion of the second lever; Rotation operation means for rotating the second lever, wherein the rotation operation means moves the pinch roller toward the capstan shaft by rotating the second lever in the other direction. After operating this pinch roller, it comes into contact with the capstan shaft and then A pinch roller support device in which the pinch roller is pressed against the capstan shaft by rotating the second lever against the biasing force of the torsion coil spring.