JP3066092U - Pinch roller device - Google Patents

Abstract

(57) Abstract: In a pinch roller device, a force for pressing a magnetic tape against a capstan shaft is made uniform in a height direction of the pinch roller without adding a new part, and the magnetic tape is fixed to the pinch roller. Improve driving stability. A pinch roller (11) for pressing a magnetic tape (T) against a capstan shaft (9) is rotatably supported on a support shaft (24) via a bearing member (23). Support shaft 24
Is attached to the pivotable arm 12. A spring body (19) for urging the arm (12) is provided. The distance H between the flat plate-shaped chassis 26 to which the capstan shaft 9 is attached and the position where the spring body 19 is locked by the spring receiving portion 17 is the distance H between the chassis 26 and the position where the bearing member 23 supports the pinch roller 11. It is equivalent.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pinch roller device.

[0002]

[Prior art]

 Japanese Utility Model Laid-Open Publication No. Sho 62-150738 discloses a cassette type tape recorder provided with a pinch roller.

As is well known, the pinch roller is also incorporated in a magnetic recording / reproducing apparatus having a function of recording information on a magnetic tape and a function of reproducing information recorded on the magnetic tape. FIG. 3 shows a schematic configuration of a magnetic recording / reproducing apparatus incorporating a pinch roller.

In FIG. 1, reference numeral 1 denotes a tape cassette having a supply reel 1a and a take-up reel 1b. Reference numeral 2 denotes a movable loading post, which is provided to draw out the magnetic tape T from the tape cassette 1 and wind it around the head cylinder 3. 4 is a full width erasing head, 5 is an audio erasing head, 6 is an audio control head, 7 is a fixed tape guide post, 8 is a movable back tension post, and 9 is a capstan shaft. FIG. 3 schematically shows a pinch roller device 10 having a pinch roller 11.

FIG. 4 is a plan view illustrating a conventional pinch roller device 10. In the pinch roller device 10 shown in FIG. 1, an arm 14 is divided into a main arm 12 and an auxiliary arm 13, and the pinch roller 11 rotates on the main arm 12 that can turn in a direction approaching and moving away from the capstan shaft 9. The auxiliary arm 13 is provided so as to be capable of engaging with the cam groove 15 a of the rotary cam 15. One end 19a and the other end 19b of a spring body 19 formed of a torsion spring are locked to the spring receiving portion 17 on the main arm 12 side and the spring receiving portion 18 on the auxiliary arm 13 side, respectively. The main arm 12 and the auxiliary arm 13 are rotatably mounted on the shaft 20, and the loop 19 c of the spring body 19 is also fitted to the shaft 20 in a fitted state.

FIG. 5 is a cross-sectional view showing principal parts of a conventional pinch roller device 10 in principle. As shown in the figure, the pinch roller 11 is formed by mounting a rubber cylinder 22 on a metal ring 21 having a cylindrical shape, for example. Then, only the intermediate portion in the height direction of the pinch roller 11 is rotatably supported by a support shaft 24 via a bearing member 23 made of a bearing, and is disposed parallel to the capstan shaft 9. The support shaft 24 is fixed to the free end of the main arm 12 forming the arm 14 described in FIG. According to the pinch roller device 10, the magnetic tape T wound around the capstan shaft 9 is pressed against the capstan shaft 9 by the pinch roller 11 elastically urged by the spring force of the spring body 19 shown in FIG. Can be

As shown in FIG. 5, in the conventional pinch roller device 10, one end 19 a of the spring body 19 (see FIG. 4) is moved downward by a distance L with respect to the position where the bearing member 23 supports the pinch roller 11. The spring receiving portion 17 is locked at a distant location.

[0008]

[Problems to be solved by the invention]

 However, as shown in FIG. 5, one end portion 19a of the spring body 19 (see FIG. 4) is attached to the spring receiving portion 17 at a position separated by a distance L below the supporting portion of the pinch roller 11 by the bearing member 23. When locked, the pinch roller 11 elastically presses the magnetic tape T against the capstan shaft 9 as shown in FIG. It is applied in a direction in which the support shaft 24 is inclined with respect to the pinch roller 11 which maintains the upright posture. As a result, the force for pressing the magnetic tape T against the capstan shaft 9 may not be uniform in the height direction of the pinch roller 11 in some cases. If such a situation occurs, the running path of the magnetic tape T deviates from an appropriate path, and in a severe case, the magnetic tape T breaks down, or the magnetic tape T in the head cylinder 3 shown in FIG. The proper wrapping state of the tape T is impaired, and the recording function and the reproducing function for the magnetic tape T are not sufficiently exhibited, so that the recording may not be performed properly or the reproduced image may be disturbed.

The present invention has been made in view of the above situation, and a direction in which a support shaft is inclined with respect to a pinch roller that is in contact with a capstan shaft and maintains an upright posture without adding new parts. The force to press the magnetic tape against the capstan shaft is made uniform in the height direction of the pinch roller by taking measures to prevent the generation of the spring force of the magnetic tape. An object of the present invention is to provide a pinch roller device in which a recording function and a reproducing function by a head cylinder are not satisfactorily exhibited.

[0010]

[Means for Solving the Problems]

 In the pinch roller device according to the present invention, only the intermediate portion in the height direction of the pinch roller for pressing the magnetic tape wound around the capstan shaft against the capstan shaft is connected to the support shaft via a bearing member. A spring body which is rotatably supported, and whose support shaft is attached to an arm which can pivot in a direction approaching and moving away from the capstan shaft, and which elastically urges the arm in a direction approaching the capstan shaft. Is provided. For example, a bearing can be used as the bearing member.

In the present invention, the spring body resiliently urges the arm at the same height position as the position where the pinch roller is supported by the bearing member. With this configuration, no spring force is generated in the direction in which the support shaft is inclined with respect to the pinch roller that is in contact with the capstan shaft and maintains the upright posture. As a result, the force pressing the magnetic tape against the capstan shaft becomes uniform in the height direction of the pinch roller, and the running stability of the magnetic tape is increased. And the playback function is not properly performed. Also, in comparison with the conventional one, it is only necessary to change the place where the spring is applied to the arm by the spring body, so there is no need to add new parts.

It is preferable that a direction of a spring force applied to the arm by the spring body is a direction orthogonal to a height direction of the pinch roller parallel to the capstan axis. In this case, the magnetic tape is pressed in a direction perpendicular to the capstan axis by the pinch roller, so that the magnetic tape sandwiched between the capstan axis and the pinch roller is pushed up or down by the pinch roller. The running stability of the magnetic tape is further improved.

[0013] It is preferable that the spring body is locked by a spring receiving portion provided on the opposite side of the capstan shaft with the pinch roller interposed therebetween, and the spring receiving portion is provided on the arm. With such a configuration, the capstan shaft, the support shaft, the pinch roller, the spring receiving portion, and the like supported by the support shaft via a bearing member are arranged in a substantially horizontal line. The generation of a force that inclines the magnetic tape is more reliably prevented, which helps to further enhance the running stability of the magnetic tape.

The capstan shaft is vertically mounted on a flat chassis, and the distance between the chassis and the place where the spring body is locked by the spring receiving portion is determined by the support of the pinch roller by the chassis and the bearing member. It is possible to adopt a configuration that is equivalent to the distance to the location. This is suitable for a pinch roller device incorporated in a magnetic recording and reproducing apparatus having a function of recording information on a magnetic tape and a function of reproducing information recorded on the magnetic tape.

[0015] It is possible to adopt a configuration in which the arm is attached to the chassis so as to be pivotable about the attachment point, and the spring receiving portion stands up from the arm. According to this, the conventional mounting structure can be directly used as the mounting structure for the arm. A similar effect is obtained by attaching the arm to the chassis via a shaft provided on the chassis, and holding the loop of the spring body made of a torsion spring in a fitted state on the shaft. It is also demonstrated by adopting the configuration that

[0016]

[Embodiment of the invention]

 FIG. 1 is a schematic plan view showing an embodiment of the pinch roller device according to the present invention, and FIG. 2 is a schematic sectional view of a portion taken along line II-II in FIG. It is incorporated in a magnetic recording / reproducing device as outlined in 3.

In the pinch roller device 10, the arm 14 is divided into a main arm 12 and an auxiliary arm 13, and the pinch roller 11 can rotate on the main arm 12 that can turn in a direction approaching and moving away from the capstan shaft 9. The auxiliary arm 13 is provided with an engaging portion 16 for engaging with the cam groove 15a of the rotary cam 15, and a spring receiving portion 17 on the main arm 12 and a spring receiving portion 18 on the auxiliary arm 13 are provided. The main arm 12 and the auxiliary arm 13 are pivotally attached to the shaft body 20, and the one end 19 a and the other end 19 b of the spring body 19 formed of a torsion spring are locked. The point 19c is the same as the conventional one described with reference to FIG.

As shown in FIG. 2, the pinch roller 11 is formed by attaching a rubber cylinder 22 to, for example, a cylindrical metal ring 21, and only a single intermediate portion in the height direction of the pinch roller 11 is single. The support shaft 24 forms the arm 14 described with reference to FIG. 1 in that the support shaft 24 is rotatably supported by a support shaft 24 via a bearing member 23 formed of a bearing and is disposed parallel to the capstan shaft 9. The main arm 12 is also fixed to the free end of the main arm 12 in the same manner as the conventional one described with reference to FIG.

The shaft body 20 to which the main arm 12 and the auxiliary arm 13 are rotatably mounted is provided on a flat plate-like chassis 26 (see FIG. 2), and the main arm 12 and the auxiliary arm 13 are It is pivotable about a mounting point with respect to 20.

Therefore, according to the pinch roller device 10, the magnetic tape T wound around the capstan shaft 9 is moved by the pinch roller 11 elastically urged by the spring force of the spring body 19. Pressed to.

In this embodiment, the spring body 19 elastically urges the main arm 12 at the same height as the position where the pinch roller 11 is supported by the bearing member 23. This situation is ensured as follows. That is, as shown in FIG. 2, the capstan shaft 9 is vertically attached to the flat chassis 26. Further, the spring receiving portion 17 of the main arm 12 is formed as an upstanding piece that extends longer than the conventional case described with reference to FIG. 5, and one end of the spring body 19 formed by the chassis 26 and the spring receiving portion 17. The distance H between the locking point A of 19a and the supporting point B of the pinch roller 11 by the chassis 26 and the bearing member 23 is set to be equal to the distance H. Further, the spring receiving portion 17 which locks one end portion 19a of the spring body 19 is provided on the opposite side of the capstan shaft 9 with the pinch roller 11 therebetween.

According to the pinch roller device 10, the direction of the spring force by the spring body 19 applied to the main arm 12 is, as shown by an arrow F in FIG. In the direction perpendicular to the height direction of Further, the spring body 19 resiliently urges the main arm 12 at the same height position as the supporting point B of the pinch roller 11 by the bearing member 23. Therefore, no spring force is generated in the direction in which the support shaft 24 is inclined with respect to the pinch roller 11 which is in contact with the capstan shaft 9 and maintains the upright posture. As a result, the force for pressing the magnetic tape T against the capstan shaft 9 becomes uniform in the height direction of the pinch roller 11 and the running stability of the magnetic tape T is increased, and the recording function of the head cylinder 3 described with reference to FIG. And the playback function will be exhibited well. Therefore, the recording on the magnetic tape T is performed well, and the image at the time of reproduction is stabilized.

The pinch roller device 10 described with reference to FIGS. 1 and 2 is an example of the pinch roller device according to the present invention. Therefore, the pinch roller device according to the present invention is not limited to the one in which the arm 14 is divided into the main arm 12 and the auxiliary arm 13 as described with reference to FIG. In short, according to the present invention, only the intermediate portion in the height direction of the pinch roller for pressing the magnetic tape wound around the capstan shaft against the capstan shaft is rotatably supported on the support shaft via the bearing member, and the support is provided. A pinch roller device having a shaft mounted on an arm that is pivotable in a direction approaching and moving away from the capstan shaft, and having a spring body that urges the arm in a direction approaching the capstan shaft. The pinch roller device provided with this element is not limited to the example shown in the figure, and is not limited to the one incorporated in the magnetic recording / reproducing device, but is also incorporated in the cassette recorder. Is included.

In FIGS. 1 to 5, the same or corresponding parts have the same reference characters allotted for simplification of the description.

[0025]

[Effect of the invention]

 According to the present invention, no spring force is generated in the direction of tilting the support shaft against the pinch roller, which is in contact with the capstan shaft and maintains an upright posture, without adding new parts. The force pressing against the capstan shaft becomes uniform in the height direction of the pinch roller, so that the magnetic tape does not break and the recording and reproducing functions of the head cylinder are not properly performed. As a result, the upper recording on the magnetic tape can be properly performed, and a good image can be obtained during reproduction.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of a pinch roller device according to the present invention.

FIG. 2 is a schematic cross-sectional view of a portion along the line II-II in FIG.

FIG. 3 is a schematic configuration diagram of a magnetic recording / reproducing apparatus incorporating a pinch roller.

FIG. 4 is a plan view illustrating a conventional pinch roller device.

FIG. 5 is a sectional view principally showing a main part of a conventional pinch roller device.

[Explanation of symbols]

Reference Signs List 9 capstan shaft 11 pinch roller 12 main arm (arm) 17 spring receiving portion 19 spring body 19c ring portion of spring body 20 shaft 23 bearing member 24 support shaft 26 chassis T magnetic tape H of spring body by chassis and spring receiving portion Distance to locking point

Claims (8)

[Utility model registration claims] A pinch roller for pressing a magnetic tape wound around a capstan shaft against the capstan shaft is rotatably supported on a support shaft via a bearing member, and only a middle portion in a height direction of the pinch roller is supported by the support shaft. A pinch roller device comprising: a spring body attached to an arm that is pivotable in a direction approaching to and away from the capstan shaft, and urging the arm in a direction to approach the capstan shaft. A pinch roller device, wherein the arm is resiliently urged at the same height as a position where the bearing member supports the pinch roller. 2. The direction of a spring force applied to the arm by the spring body is perpendicular to a height direction of the pinch roller parallel to the capstan axis. Pinch roller device. 3. The arm according to claim 1, wherein the spring body is engaged with a spring receiving portion provided on the opposite side of the capstan shaft with the pinch roller therebetween, and the spring receiving portion is provided on the arm. The pinch roller device according to claim 2. 4. The pinch roller according to claim 1, wherein the capstan shaft is vertically mounted on a flat chassis, and a distance between the chassis and a position where the spring body is locked by the spring receiving portion is determined by a distance between the chassis and the bearing member. 4. The pinch roller device according to claim 3, wherein the distance between the pinch roller and the support point is equal to the distance between the pinch roller and the support point. 5. The pinch according to claim 3, wherein said arm is mounted on said chassis so as to be pivotable about its mounting point, and said spring receiving portion rises from said arm. Roller device. 6. The arm is attached to the chassis via a shaft provided on the chassis, and a loop of the spring body formed of a torsion spring is held by the shaft in a fitted state. Item 6. The pinch roller device according to item 5. 7. The pinch roller device according to claim 1, wherein the bearing member is a bearing. 8. A magnetic recording / reproducing apparatus having a function of recording information on a magnetic tape and a function of reproducing information recorded on the magnetic tape. The described pinch roller device.