JPS596526Y2 - Pivot support device for preventing accidental erasure of tape recorders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft support device for preventing accidental erasure of a tape recorder, which is particularly suitable for an accidental erasure prevention lever of a tape recorder having a plastic mechanism.

Recently, for example, in cassette tape recorders, etc., the chassis, which had traditionally been made of metal materials, and the various mechanical parts mounted on the chassis, have been made by molding for the purpose of reducing size, weight, and cost. In other words, the development of plastic mechanisms for manufacturing is actively being carried out.

And, trying to make this kind of plastic mechanism,
Not only does it have the effect of reducing size, weight, and cost, but it also makes it easier to shape the chassis and various mechanical parts, and it also eliminates the impact noise and vibration noise that occurs when operating the operating members that are unique to cassette tape recorders. It has various advantages such as being able to absorb

By the way, in a cassette tape recorder with a plastic mechanism as described above, the next requirement is to make each mechanical part operate more smoothly and to minimize the number of parts as much as possible. , to further reduce size, weight, and cost.

To this end, it is necessary to organically structure the various mechanical parts and the chassis, and to combine the various mechanical parts and the chassis efficiently without waste.

Therefore, this invention was made in view of the above points, and the purpose is to provide an extremely good shaft support device that can satisfy the above-mentioned demands for plastic mechanisms.

That is, the shaft support device according to this invention can be applied to, for example, an erroneous erasure prevention mechanism in a cassette tape recorder with a plastic mechanism, and is rotatable about a shaft such as the erroneous erasure prevention lever of the cassette tape recorder. Regarding the support device for the shaft of a rotating member, by skillfully utilizing the properties of plastic material and providing an elastic part and a rigid part at the end of the plastic shaft, the former can be used to fit into the support part. It is characterized in that it is prevented from contributing to deformation, is prevented from coming off from the support part by the biasing force after fitting, and the latter receives the rotational force after fitting.

Hereinafter, an embodiment in which this invention is applied to a cassette tape recorder will be described in detail with reference to the drawings.

FIG. 1 shows the basic structure of the embodiment described here, and 11 is the main chassis of the cassette tape recorder, which is made of plastic (or resin) material.

In front of the chassis 11 (lower side in the figure), a plurality of operating members 12 are arranged so as to be freely slidable in the direction of the arrow for setting the cassette tape recorder in a predetermined operating state or in a stopped state.

13 of the plurality of operating members 12 is a stop/eject operating member that stops a predetermined operating state of the cassette tape recorder and operates an eject mechanism 14 for ejecting a cassette tape (not shown).

Reference numeral 15 denotes a recording operation member, and when this is operated, the playback operation member 16 is also operated in conjunction with the projecting piece 151 (see FIG. 2).

Furthermore, 17. 18 is a rewind and fast forward operation member, and 19 is a pause operation member for temporarily stopping the recording or playback operation state.

Here, a metal head chassis 20 is provided on the upper surface of the chassis 11 and is slidable in the same direction as the operation direction of the playback operation member 16 in conjunction with the operation of the playback operation member 16.

A mounting member 21 made of synthetic resin and having a predetermined shape (as shown in the figure) is provided on the head chassis 20. As shown in FIG.

Further, on this mounting member 21, a recording/reproducing head 22, an erasing head 23, a tape stop detection lever 24, a spring 25, etc. are provided.

In this case, the spring 25 is engaged between the head chassis 20 and the regeneration operation member 16 in order to establish an interlocking relationship between them.

The recording/reproducing head 22 is connected to a lead wire 26. shown by a dashed line in the figure. It is connected to a recording and reproducing circuit (not shown) via 27.

Further, on the right side of the head chassis 20 in the figure, there is a pinch lever 29 made of plastic that can freely rotate in the directions of arrows A and B about the rotation shaft 28 as the head chassis 20 slides. is provided.

A pinch roller 31 is provided at one end of the pinch lever 29 and is pressed against a capstan 30 provided coaxially with a flywheel 44, which will be described later, when the pinch lever 29 is rotated in the direction of arrow A. There is.

Furthermore, at the rear of the chassis 11 (upper side in the figure), there is a resin-made accidental erasure device that detects the presence or absence of an accidental erasure prevention claw provided on the cassette tape and makes the recording operation member 15 operable or inoperable. A prevention mechanism 32 is provided.

In addition, 33. 34 is a guide pin; 35. 36 is a left and right reel stand, and 37 is a motor.

FIG. 2 schematically shows the structure of various mechanisms on the lower surface of the chassis 11 of the cassette tape recorder shown in FIG.
The operating members 15 to 18 are provided substantially perpendicularly to the operating members 15 to 1B, and are engaged with the operating members 15 to 1B so that the arrows C,
A locking plate 38 that is slidable in the D direction is configured to be locked at the operating position.

Also, the lock plate 32 is provided substantially parallel to the above-mentioned recording device.
A switch slider 3 that engages with the playback, rewind, and fast-forward operation members 15 to 18 and is slidable in the directions of arrows E and F.
Reference numeral 9 turns on a power supply switch 40 for the motor 37 when the motor 37 is moved in the direction of arrow E.

Furthermore, the playback and rewinding operation member 16. 17 is provided with a biasing force directed downward in the drawing by a coiled spring 41 bent into a substantially V shape.

Furthermore, the recording operation member 15 is not operated when other operation members (playback, rewind, and fast-forward operation members 16 to 18) are operated in advance by a erroneous recording prevention mechanism 42 made of resin at approximately the middle thereof. It is considered impossible.

Further, the tape stop detection lever 24 is connected to the chassis 11.
The automatic stop mechanism 4 made of resin is equipped on the lower right side of the figure.
3.

In the figure, reference numeral 44 denotes a flywheel, which is connected to a rotary pulley 45 of the motor 37 via a belt 46 so as to be able to transmit rotational force.

Next, in a plastic-mechanized cassette tape recorder having the basic structure as described above, the accidental erasure prevention mechanism 32 made of a resin material to which the shaft support device of this invention is applied will be explained in detail.

That is, FIG. 3a shows a sectional view taken along line 3-3' in FIG.
An erroneous erasure prevention mechanism 32 is constructed by fitting an erroneous erasure prevention lever 321 having a substantially L-shaped side surface into the erroneous erasure prevention lever 321 .

In this case, as shown in Figures b, c, and d, a notch 112 is formed at the rear end of the chassis 11, and a notch 112 is provided below the notch 112 and protrudes inward from the rear end surface of the chassis 11. Support part 11 consisting of fitting parts 113 and 114
1, the erroneous erasing lever 321 is inserted in the order of the arrow A and the opening and is fitted.

Here, the accidental erasure prevention lever 321 has a cassette detection piece 322 and a recording operation member control piece 323, both of which have key-shaped tips on the upper and lower sides, and a spring piece 324 protruding between them. 3 pieces of each of these
22 to 324 are integrally formed with a shaft portion 325 that serves as a rotation axis.

Further, the accidental erasure prevention lever 321 is molded from a composite resin, and in this case, the rotation shaft is formed by rigid portions 326 and 327 left at both ends of the shaft portion 325 in a substantially crescent shape on the sides.
and elastic parts 328, 329 which are hollow and have a semi-circular cross section and are left in the shape of a clockwork, located slightly inward from the rigid parts 326, 327 and corresponding to the locking parts 113, 114 of the support part 111. is taking shape.

That is, when the erroneous erasure prevention lever 321 is fitted into the fitting parts 113 and 114 of the support part 111, the elastic parts 328 and 3 of the shaft part 325 of the erroneous erasure prevention lever 321
29 is bent by being pressed by the end locking parts 115, 116 of the fitting parts 113, 114 against the biasing force.
They are fitted over the locking portions 115 and 116.

If one end is fitted like this, the elastic part 3
Since the biasing forces 28 and 329 are acting, the fitted state is maintained as long as no external force is applied.

Further, after the erroneous erasing prevention lever 321 is fitted, the lever 321 rotates depending on the presence or absence of the cassette 50, as will be described later, and the rotational force at this time is mainly received by the rigid portions 326 and 327.

In this case, the rigid portions 326 and 327 are rotatably supported using a predetermined portion of the chassis 11 as a bearing portion.

In addition, the spring piece 324 of the accidental erasure prevention lever 321 engages with the engaging portion 117 of the chassis 11 in the above-mentioned fitted state, and applies a biasing force that constantly rotates the accidental erasure prevention lever 321 in the counterclockwise direction. It is for granting.

Furthermore, the key-shaped end of the recording operation member control piece 323 of the accidental erasure prevention lever 321 is always connected to the tip of the recording operation member 15 (when there is no accidental erasure prevention claw on the cassette 50).
They are engaged to regulate the position of the biasing force applied in the counterclockwise direction.

The protrusions 324 a and 324 b provided below the middle part and the tip part of the spring piece 324
This is to protect the roots of No. 4 from excessive stress.

In the above configuration, when the cassette 50 does not have an accidental erasure prevention claw, as shown in FIG. 323 engages with the recording operation member 15, and by making it impossible to operate the recording operation member 15, so-called erroneous erasure is prevented.

Also, if the cassette 50 has an accidental erasure prevention claw, the third
As shown in FIG. 323 is detached from the recording operation member 15 to enable the recording operation member 15 to be operated.

Therefore, as detailed above, according to this invention, by skillfully utilizing the properties of the plastic material to provide an elastic part and a rigid part at the end of the plastic shaft, the former can be fitted to the support part. The structure is organic in that it not only contributes to the deformation to enable this, but also prevents it from separating from the support part by the biasing force after fitting, and the latter receives the rotational force after fitting. It becomes possible to provide an extremely good shaft support device that can rotatably support the shaft portion efficiently and efficiently, thereby satisfying the demand for plastic mechanisms.

It should be noted that this invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that various modifications and applications can be made without departing from the gist of this invention.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the basic structure when applied to a cassette tape recorder as an embodiment of the shaft support device according to the invention, FIG. 2 is a plan view showing the same from FIG. 1 with the main chassis removed, Figures 3a to 3e are a 3-3' sectional view of Figure 1 showing details of the accidental erasure prevention mechanism, a side view showing an exploded state, a perspective view showing an assembled state, a front view thereof, and an operating state. FIG. 11... Chassis, 111... Support part, 112... Notch part, 113, 114...
.... Fitting part, 115, 116 .... Locking part, 32 .... Erroneous erasure prevention mechanism, 321 ....
- Erroneous erasure prevention lever, 322...--Cassette detection piece, 323... Recording operation member control piece, 324-
...Spring piece, 325...Shaft part, 326,
327... Rigid part, 328, 329...
...Elastic part.

Claims (1)

[Scope of utility model registration request] A rotation shaft made of plastic with a hollow elastic part and a rigid part formed at both ends of a solid shaft part, and a thing that pivotally supports this rotation shaft and includes the shaft part, the elastic part, and the rigid part. A shaft support device for preventing accidental erasure of a tape recorder, comprising a supporting part made of plastic and having a fitting part, a locking part, and a bearing part formed in correspondence with the respective parts.