JP3010842B2 - Reel base unit of tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel unit for a tape recorder.

[0002]

2. Description of the Related Art In recent years, tape recorders have been required to have high reliability in addition to cost reduction and size reduction. Among them, a reel base mechanism includes a mechanism for releasing a driving claw when a tape is mounted and a mechanism for preventing an abnormal tape tension during a brake operation for protecting a cassette tape.

[0003] An example of the above-described conventional reel base device of a tape recorder will be described with reference to the drawings.

FIG. 3 is a partial sectional side view of a conventional reel base unit of a tape recorder. In FIG.
Reference numeral 1 denotes a bearing member formed on a chassis 2, 3 denotes a reel gear that is supported by the bearing member 1 and receives rotational driving from a driving source (not shown) by a gear portion 3a, and 4 denotes a distal end portion 3b of the reel gear 3. The press-fitted reel base 5 has a claw 5a that is pivotally supported by the reel base 4 and engages with the brake member 6, and is located at a position opposite to the surface 4a of the reel base 4 via the felt 7 (see FIG. 4). Pulleys 8 constituting the core groove 5b are bushes press-fitted into the lower portion 4b of the reel base 4 while urging the pulley 5 toward the reel base 4 via the brake spring 9. Reference numeral 10 denotes a driving claw that is slidably guided by a hexagonal cross section 4c of the reel base 4 as a guide and engages with the hub of the cassette tape at a claw portion 10a. Reference numeral 11 denotes a reel spring that urges the driving claw 10 upward. The cap is press-fitted onto the base 4 to prevent the drive claw 10 from coming off.

The operation of the reel unit of the tape recorder constructed as described above will be described below. First, the reel gear 3 which has been rotationally driven by the driving source rotates the reel base 4 through the press-fitting portion 3b, transmits the rotation to the driving claw 10 through the hexagonal cross section, and rotates the cassette tape hub with the claw portion 10a. And take up the tape. At the time of the stop operation, the brake member 6 engages with the claw portion 5a of the pulley 5 to stop the reel base while absorbing the inertia of the tape running via the felt 7. The drive claw 10 moves downward by bending the reel spring 11 when the pin of the hub abuts on the claw portion 10a when the cassette tape is mounted, thereby preventing erroneous mounting of the cassette tape.

In another embodiment, the pulley 5, the felt 7, the bush 8, and the brake spring 9 are not provided.
There is also a configuration in which the brake member 6 and the reel base 4 are directly engaged with each other to apply a braking force.

[0007]

However, the above-described conventional reel stand device of a tape recorder has many problems, such as high cost and difficulty in thin configuration. In other embodiments, there is no mechanism for absorbing the inertia of the running of the tape at the time of the brake operation, so that there is a problem that abnormal tension is applied to the tape.

The present invention has been made in view of the above-mentioned conventional problems, and provides a low-cost, low-cost tape recorder reel base mechanism capable of producing a stable braking effect of a reel base (tape) during a brake operation. It is done for the purpose of.

[0009]

According to the present invention, there is provided a tape recorder reel base device having a hexagonal cross section and a cylindrical cross section which are rotatable. The hexagonal cross section of the reel base is slidable downward with a guide, and has a projection inserted into all or a part of the six pins of the hub in the cassette tape. A driving claw that transmits a rotational force to the hub by engagement, and a slidable upward with a cylindrical cross section of the reel base as a guide, and rotatable while being in vertical contact with the reel base, and a projection on an outer peripheral part. A brake member that brakes reel rotation, a brake pulley that is engaged with the protrusion, and a spring that is configured between the brake pulley and the driving claw and that urges each upward and downward. It is characterized by the following.

[0010] A ring-shaped convex portion is provided near the outer periphery of one of the opposing surfaces of the brake pulley and the reel stand, and the contact portions in the up and down directions of the two are formed by the portion between the convex portion and the mating plane. It is characterized by being limited to.

[0011]

According to the present invention, a drive claw and a brake pulley are formed above the reel base via a spring by the above-described structure.
By utilizing the spring pressure of one spring for the drive claw escaping mechanism when the cassette tape is mounted and the inertia absorption mechanism for the tape running during the brake operation, a stable braking effect of the reel base (tape) during the brake operation is achieved. It is possible to realize at low cost a reel base device of a tape recorder that can be produced in a small and thin type.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reel base device of a tape recorder according to the present invention will be described below in detail with reference to FIGS.

FIGS. 1 and 2 show a reel unit of a tape recorder according to an embodiment of the present invention. FIG.
Is a plan view. In FIG. 2, reference numeral 13 denotes a bearing member formed on a chassis 14, and reference numeral 15 denotes a gear 15a which is supported by the bearing member 13 and rotationally driven by a driving source (not shown).
, The reel gear 16 received at the tip 1 of the reel gear 15
The reel base 17 press-fitted with 5b is a reel base 16
This is a brake pulley having a claw portion 17a that is pivotally supported by the cylindrical cross section 16a and engages with the brake member 18 and that has a ring-shaped convex portion 17b near the outer periphery of the surface facing the reel base 16. Reference numeral 19 denotes a driving claw which is slidably guided by a hexagonal section 16b of the reel base 16 as a guide, engages with the hub of the cassette tape at a claw 19a, and is prevented from being removed by the claw 16c of the reel base. Are biased upward and the brake pulley 17 is biased downward.

The operation of the reel unit of the tape recorder constructed as described above will be described below. First, the reel gear 15 which has been rotationally driven by the driving source rotates the reel base 16 through the press-fitting portion 15b, and transmits the rotation to the driving claw 19 through the hexagonal cross-section 16b, thereby causing the claw portion 19 to rotate.
The tape tape is wound by rotating the hub of the cassette tape in a. At the time of the stop operation, the brake member 18 engages with the claw portion 17a of the brake pulley 17 and absorbs the inertia of the tape while utilizing the sliding friction between the ring-shaped convex portion 17b and the opposing surface 16d of the reel base. Stop the platform. The drive claw 19 moves downward by bending the reel spring 20 when the pin of the hub abuts on the claw portion 19a at the time of mounting the cassette tape, thereby preventing erroneous mounting of the cassette tape.

As described above, according to this embodiment, the reel spring 20 is used for both the upward biasing of the driving claw 19 and the biasing of the brake pulley 17 to the reel base 16 (the generation of sliding frictional force). The reel base device can be configured with a small number of components, and can be realized at low cost and small and thin. Further, the contact portion between the brake pulley 17 and the reel base 16 is
By limiting to the ring-shaped convex portion 17b near the outer periphery having the diameter as large as possible on the brake pulley 17 side, it is possible to stably take out the friction torque without felt, and to further reduce the thickness by the felt thickness. In this embodiment, the convex portion 17b is formed on the brake pulley 17 side. However, the same effect can be obtained by forming the convex portion 17b only on the reel base 16 side.

[0016]

As described above, according to the present invention, a driving claw and a brake pulley are formed above a reel base via a spring, and
A stable braking effect of the reel base (tape) during the brake operation is generated by using the spring pressures of the individual springs for the drive claw escape mechanism when the cassette tape is mounted and the inertia absorption mechanism for the tape running during the brake operation. Thus, a tape recorder reel base device that can be reduced in size and thickness can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reel base device of a tape recorder according to an embodiment of the present invention.

FIG. 2 is a plan view of a reel base device of the tape recorder in the embodiment of the present invention.

FIG. 3 is a partial cross-sectional side view of a conventional reel base device of a tape recorder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Bearing member 14 Chassis 15 Reel gear 16 Reel base 17 Brake pulley 18 Brake member 19 Driving claw 20 Reel spring

Claims (2)

(57) [Claims] 1. A reel base having a hexagonal cross section and a cylindrical cross section and rotatably configured, and a hub in a cassette tape slidable downward with the hexagon part of the reel base as a guide. A driving claw having a projection inserted into all or a part of the six pins and transmitting a rotational force to the hub by engagement of the pin and the projection; and guiding the cylindrical section of the reel base. A brake pulley that is slidable upward and rotatable while being in vertical contact with the reel base, has a protrusion on an outer peripheral portion, and a brake member that brakes reel rotation and a brake pulley that engages with the protrusion; A reel unit for a tape recorder, comprising: a spring configured between a brake pulley and the driving claw to bias each of the driving pulleys upward and downward. 2. A ring-shaped convex portion is provided near the outer periphery of one of the opposing surfaces of the brake pulley and the reel base, and both vertical contact portions are formed between the convex portion and the mating plane. 2. The tape recorder reel base device according to claim 1, wherein the reel base device is limited to a part.