JPS5834601Y2 - Tape recorder cassette mounting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a tape cassette reel valve device that engages the reel knob of the tape cassette and rotates the hub to wind up the magnetic tape, making it easier to install the tape cassette. The present invention also relates to a reliable reel stand device for a cassette tape recorder.

An example of a conventional device of this type is shown in FIGS. 1 and 2 of Japanese Utility Model Application Publication No. 47-27804.

That is, in this first conventional example, the carrier element having carrier ribs can be displaced in the axial direction while maintaining an upward movement tendency, and is therefore particularly suitable for mounting a cassette on the carrier element. Since all the components including the springs are arranged above the table, the structure is complicated above the turntable, that is, near the cassette hub when the cassette is installed.

Furthermore, in this conventional example, the carrier element is fitted into a boss part that is integrated with the turntable, and is biased toward the flange side by a spring. Therefore, when the cassette is mounted vertically, the carrier element is attached to the carrier rib. When the carrier element is pushed in a state where it collides with the protrusion of the cassette reel, the carrier element moves downward against the elasticity of the spring, and the carrier element can move downwardly between the upper end surface of the carrier element and the lower surface of the flange. A gap is created within a finite range, and this gap is larger than the diameter of the protrusion on the reel.There is a considerable degree of freedom in the mounting position of the reel hub on the cassette, so one or more of the protrusions may be pinched in between. The tape may not be able to be fed out normally, or the cassette may not be able to be fed out properly, or even if the cassette can be ejected, the recording position on the tape may be misaligned during playback, making playback impossible. This has the serious drawback that a large load is applied between the two, causing external damage.

In addition to this conventional example, there has also been proposed one as shown in Japanese Utility Model Application Publication No. 47-9404 filed by the same applicant as the present application.

According to this second conventional example, after a spring is inserted into a reel shaft having a pulley, a plurality of protrusions provided on the inner circumferential surface of the hub of the tape cassette and protrusions that can be locked on the side surfaces are attached to the reel. A cylindrical portion formed to extend in the axial direction is fitted into the cylindrical portion so that it cannot idle but can be slid up and down, and the upper end of the cylindrical portion is prevented from upward movement by a cap attached to the upper end of the reel shaft. The upper end of the protrusion is formed in advance to form a reel stand assembly which is formed lower than the upper end surface of the cylindrical part, and this assembled assembly is rotatably supported as a whole on a pivot provided protruding from a fixed base plate. A reel stand device is also known in which a stop member is disposed at the free end of the pivot shaft to prevent the assembly from being pulled out from above.

However, the cylindrical portion is displaceable in the axial direction of the reel shaft, and the upper end of the protrusion of the cylindrical portion is lower than the upper end surface of the cylindrical portion.

Even if the protrusion of the cassette hub and the protrusion of the cylindrical part of the reel stand come into contact with each other loosely when the tape cassette is mounted on the reel stand device, in many cases they will engage properly due to the rotation of the cylindrical part of the reel stand. However, when the cassette is installed, the retaining protrusion of the cassette hub may get caught between the upper end surface of the cylindrical part of the reel stand and the lower surface of the cap, resulting in damage to the protrusion of the cassette reel hub. Ta.

The present invention was devised to eliminate the drawbacks seen in the above-mentioned conventional examples, and its feature is that the tape cassette glue has an integral protrusion that can engage with a plurality of protrusions provided on the inner peripheral surface of the hub. In order to prevent the pulley from idling, an engaging body having a tapered upper part is vertically movably and rotatably supported on a pivot protruding from the chassis, and the engaging body is attached upwardly with respect to the chassis. A spring for biasing the engagement member is disposed around the pivot shaft on the underside of the pulley, and the tip of the pivot protrudes from the upper part of the engagement member, and a spring for limiting the upward movement of the engagement member is provided at this protruding portion. It is an object of the present invention to provide a reel stand device for a cassette type tape recorder which is provided with a stopper.

One embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a chassis mainly consisting of a tape recorder, and a pivot shaft 3 protruding from a U-shaped metal fitting 2 is provided on this chassis.

Reference numeral 4 denotes a reel hub engaging body, the upper part of which has a truncated conical shape, for example, and a tape cassette hub 13 shown in FIG. The lower part is formed into a prismatic body in order to fit the pulley 5 through a polygonal hole 6 to prevent it from idling, and has a central hole in the center.

Reference numeral 7 denotes a spring that urges the engaging body 4 upward, and 8 a stop piece that is engaged with a groove at the top end of the pivot shaft 3 that restricts the upward movement of the engaging body 4.

A stepped groove 9 is provided on the lower surface of the pulley 5, and a bearing 10 such as Delrin is screwed onto the chassis 1 into this groove, so that the pulley 5 is rotatably mounted without being able to move up and down.

To assemble it, as shown in FIG.
The bearing 10 is assembled by fitting the bearing 10 into the stepped groove 9 on the lower surface of the pulley 5 to prevent upward movement.

Note that the bearing 10 and the stepped groove 9 of the pulley 5 may be omitted from the above structure, and the engaging body 4 and the pulley 5 may be fitted and fixed to form a combined structure.

The structure of the reel valve device according to this invention is as described above. To use this device, place the cassette on the chassis so that the engaging body 4 protruding from the main chassis 1 fits into the hole 12 of the cassette 11. 13 protrusions 14 are the engaging body 4
As shown in FIG.

- When the protrusion 14 and the upper end surface of the protrusion 4a abut each other as shown in FIG.

In this state, if the engaging body 4 is rotated via the pulley 5, the hub protrusion 14 and the upper end surface of the protrusion 4a of the engaging body 4 will come out of contact, and the engaging body 4 will spring 7 as shown in FIG. The projection 14 is moved upward by the restoring force, and the projection 14 is engaged with the side surface of the projection 4a, and the pulley 5
rotation is transmitted to the hub 13.

Of course, the middle spring 7 may be a plate spring 7A as shown by the chain line in FIGS. 2 and 3.

Further, in FIG. 4, reference numeral 15.15 indicates a magnetic head, and reference numeral 16 indicates a pinch roller.

As described above, according to this invention, a protrusion that can engage with a plurality of protrusions provided on the inner peripheral surface of the reel hub of a tape cassette is integrally formed, and the upper part is tapered to prevent the pulley from spinning idly. The engaging body is vertically movable and rotatably supported on a pivot provided protruding from the chassis, and a spring for biasing the engaging body upward with respect to the chassis is provided around the pivot on the underside of the pulley. At the same time, the tip of the pivot is made to protrude from the upper part of the engaging body, and a stopper for restricting the upward movement of the engaging body is disposed on this protruding part, so that the reel stand cylinder in each of the conventional examples is Since the reel base and the reel base shaft can be integrated, the reel base cylindrical part and the cap are not necessary with this invention, and when the cassette is inserted, the reel hub protrusion of the cassette is pinched between the reel base cylindrical part and the cap. Even if there is a gap between the tapered part of the upper part of the engaging body and the stopper, the upper part of the engaging body 4 is tapered, and the engaging body 4 is pressed by the flap 7. Since the reel hub protrusion of the cassette is raised, there is no possibility that the reel hub protrusion of the cassette gets caught in the above-mentioned gap, and therefore, damage to the cassette reel hub protrusion, including the reel base cylindrical part and the cap, which was seen in the conventional example can be prevented. have an effect.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is an exploded perspective view of the main parts of the reel receiving rotation shaft, Fig. 2 is a sectional view of the assembled state of what is shown in Fig. 1, and Fig. 3 is Fig. 2. FIG. 4 is a plan view of the essential parts of a cassette tape recorder equipped with this device, and FIG. 5 is a perspective view of the beam hub. Explanation of symbols, 1... Chassis, 2... U-shaped metal fitting, 3
... Pivot, 4... Engaging body, 4a... Projection of engaging body 4, 5... Pulley, 6... Polygonal hole, 7... Spring,
8... Stop piece, 9... Step groove, 10... Bearing, 11...
...Cassette, 12...hole, 13...reel hub,
14... Protrusion.

Claims (1)

[Scope of utility model registration request] An engaging body with a tapered upper part is protruded from the chassis to prevent the IJ from idling while integrally forming protrusions that can engage with a plurality of protrusions provided on the inner peripheral surface of the reel of the tape cassette. A spring is disposed around the pivot on the underside of the pulley for urging the engaging body upwardly with respect to the chassis, and a spring is disposed around the pivot on the lower side of the pulley. A cassette type tape recorder reel stand device comprising a distal end protruding from an upper part of the engaging body, and a stop piece for restricting upward movement of the engaging body arranged on the protruding portion.