JPS6213241Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette tape recorder, and in particular aims to reduce the size of the tape recorder and stabilize the capstan by preventing unnecessary loads from being applied to the capstan, which runs the magnetic tape at a constant speed. The present invention relates to a cassette tape recorder that is capable of driving a magnetic tape in a stable manner.

Conventionally, in order to keep the magnetic tape inside the cassette running stably, the cassette is stably held at a predetermined position in a cassette tape recorder using a cassette position regulating means as shown in Fig. 1, so that the magnetic tape always remains at the predetermined position of the cassette. There are known ones that are made to run.

To explain this with reference to FIG. 1, on the base plate 2 of the cassette storage part of the cassette tape recorder, there is a cassette that is inserted into the through holes 3 and 4 provided in the cassette 1 and is located on the side of the opening window 5 of the cassette 1. The height position regulating parts 6 and 7 are supported at two places on the lower surface, and the magnetic head which is inserted into the opening window 5 contacts the back side of the cassette 1 on the side opposite to the opening window 5. A plate spring 9, which is a biasing member that presses toward the (not shown) side, is provided. In particular, the height regulating members 6 and 7 regulate the height of the cassette 1 at the reference surfaces 6a and 7a that support the lower surface of the cassette 1.
Also, the plate spring 9 allows the cassette 1 to
By biasing the magnetic heads toward the magnetic head as described above, the protrusions 66 and 67 of the height position regulating members 6 and 7 inserted into the through holes 3 and 4 of the cassette 1 are used as position regulating members to prevent the cassette 1 from moving. The horizontal position of is also regulated. Further, one of the through holes 10 and 11 for inserting the capstan into the cassette 1 has a second hole.
As shown in the figure, a capstan 12 driven by a motor is inserted therethrough. A flywheel 13 that also serves as a pulley to increase inertia is integrally attached to the lower part of the capstan 12, and is smoothly and rotatably supported by bearings 15 and 16 in a sleeve 14 attached to the base plate 2. . Note that the lower end portion of the capstan 12 is supported by a thrust receiving member 17.

By the way, in such a conventional cassette recorder, the height position and horizontal position of the cassette 1 are regulated by the above-mentioned height position regulating members 6, 7, and 8, thereby preventing backlash while the magnetic tape is running. Although the sleeve 1 is configured to prevent this and ensure stable running of the magnetic tape,
The length of the portion of the capstan 12 that projects upward from the bearing 15 attached to the capstan 4 is relatively long as shown in FIG. In other words, capstan 12
The length between the bearings 15 and 16 is relatively short compared to the total length of the capstan 1.
There is a problem that the vertical support state of No. 2 is not stable.

That is, the capstan 12 is connected to the bearing 1.
In order to be able to rotate with respect to 5 and 16, a gap is provided between them, and if the distance between the bearings 15 and 16 is short, vertical fluctuations during rotation of the capstan 12 will be large. On the other hand, when the distance between the bearings 15 and 16 is long, the fluctuation in the vertical direction during rotation of the capstan 12 can be suppressed to a relatively small value.

Therefore, if the distance between the bearings 15 and 16 is short, the perpendicularity of the portion of the capstan 12 facing the magnetic tape in the cassette 1 will deteriorate during its rotation, and the stable running of the magnetic tape will be hindered. Become. In such a case, in order to improve the perpendicularity of the capstan 12, the gap between the circumferential surface of the capstan 12 and the inner surfaces of the bearings 15 and 16 has to be made tighter, which in turn increases the frictional resistance. It was necessary to unnecessarily increase the drive torque of the drive motor that rotates the capstan 12.

Therefore, the present invention was devised for the purpose of solving the problems of the conventional ones as mentioned above, and in particular, it aims to reduce the size of the cassette tape recorder while also making it possible to use magnetic tape. This invention was proposed for the purpose of providing a cassette tape recorder that prevents unnecessary loads from being applied to the capstan, which is intended to run at a constant speed, to ensure stable drive of the capstan, thereby enabling stable running of magnetic tape. It is something.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a side sectional view showing the main parts of the cassette tape recorder according to the present invention. ,
A through hole 19 is provided into which a bearing sleeve 22 for supporting a capstan 25 is inserted and fitted via bearings 20 and 21 housed at the upper and lower ends. The bearing sleeve 22 is inserted with its upper end side into the through hole 19 from the lower surface side of the substrate 18 so as to protrude, and is inserted until the flange portion 23 provided around the middle portion comes into contact with the lower surface of the substrate 18. and is fitted and disposed on the substrate 18. Note that the flange portion 23 is fixed with screws or the like as necessary. The bearing sleeve 22 attached to the board in this manner has a bearing 20 housed at the upper end, a bearing 21 located above the board 18, and a bearing 21 housed at the lower end.
is mounted below the substrate 18, and the distance between the upper and lower bearings 20, 21 can be increased.

Then, the capstan 25 with the flywheel member 24 attached to the lower end side is attached to the bearings 20, 21.
The substrate 18 is supported perpendicularly to the substrate 18 by these bearings 20 and 21. The lower end of the capstan 25 supported in this way is supported by the thrust bearing 26, and the upper end thereof is supported by the bearing 2.
It protrudes and extends above 0.

By the way, the bearing 2 that supports the capstan 25
A lower end portion 22a from the flange portion 23 of the bearing sleeve 22 that houses the bearing sleeve 21 is a recess 2 formed in the center of the flywheel member 24 and extending concentrically along the axial direction of the capstan 25.
It can be inserted into 9.

Further, on the substrate 18, there are cassette height position regulating members 6, 7, 8 and a plate spring 9, similar to the conventional cassette tape recorder described above.

As is well known, when the cassette 1 is mounted on the cassette tape recorder constructed as described above, and the height position and horizontal position of the cassette 1 are properly regulated and held using the height position regulating member, etc. The upper end of the bearing sleeve 22 near the bearing 20 enters into the capstan insertion through hole 27 of the cassette 1.

By the way, the substrate 1 of the bearing sleeve 22
The upper end side projecting upward from 8 has a diameter smaller than that of the through hole 27 for inserting the capstan, and smaller in diameter than the lower end side. That is, in this embodiment, a tapered portion is formed on the upper end side of the bearing sleeve 22 so that the upper end side has a smaller diameter than the through hole 27 for inserting the capstan, and is smaller in diameter than the lower end side. ing.

Therefore, when the upper end of the bearing sleeve 22 near the bearing 20 enters the capstan insertion through hole 27 of the cassette 1 as described above, the outer peripheral surface of the upper end of the bearing sleeve 22 and the capstan insertion There is an extra gap 2 between the inner circumferential surface of the through hole 27
8 are now formed and are in a state where they do not come into contact with each other.

As described above, the present invention includes a capstan 25 that is inserted into a cassette 1 that is positioned and mounted on a cassette mounting portion of a cassette tape recorder, and a bearing sleeve 22 that supports this capstan 25.
Since the cassette 1 does not come into contact with the cassette 1, the cassette 1 is not subjected to any load from the biasing means for positioning and supporting the cassette 1. Therefore, the capstan 25 and the bearing sleeve 22 can maintain verticality for a long time without being influenced by the side pressure from the urging means. Furthermore, since the distance between the bearings 20 and 21 that support the capstan 25 can be set to be sufficiently longer than that of conventional bearings, the perpendicularity of the capstan 25 can be maintained in a preferable state during rotation. Therefore, the running of the magnetic tape that is run by the rotation of the capstan 25 is also stabilized, making it possible to sufficiently reduce wow and flutter. Furthermore, since it is easy to obtain the perpendicularity of the capstan 25, the bearing 2
It is possible to eliminate the difficulty of setting strictly the mounting dimensions for the capstan 25 of 0 and 21, and to reduce the power consumption by suppressing the drive torque of the drive motor in a conventional capstan device whose dimensions are set strictly. This makes it possible to downsize and reduce the cost of the drive motor.

In addition, the present invention increases the distance between the bearings 20 and 21 that support the capstan 25, and
Even if the bearing sleeve 22 that accommodates 0 and 21 is long, the other end side portion 22a of this bearing sleeve 22
is inserted into the recess 29 of the flywheel member 24, so the thrust receiver 26
The thickness from the to the substrate 18 can be made thinner than in the conventional case.

Furthermore, the present invention provides a structure in which the bearing sleeve 22 is attached to the substrate 1.
8, the flange portion 23 is located on the lower surface side of the substrate 18 where the cassette mounting portion is not formed. If the substrate 18 is configured to serve as a height reference plane for the mounted cassette 1, the thickness of the upper surface of the substrate 18 on the cassette mounting portion side can also be made thinner.

As described above, according to the present invention, it is possible to provide a capstan device with a capstan that always maintains accurate verticality, so smooth tape running with a small load can be guaranteed, and wow and wow problems can be avoided.
Favorable recording and reproduction characteristics can be obtained by suppressing adverse effects such as flutter that cause deterioration of recording and reproduction characteristics, and furthermore, tape recorders can be made thinner and more compact.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the main parts of a conventional cassette tape recorder, and FIG. 2 is a sectional view of the main parts. FIG. 3 is a sectional view of the main part of the cassette tape recorder according to the present invention, and FIG. 4 is a sectional view of the main part showing a state in which the cassette is mounted with the top surface of the board as the height positioning surface of the cassette. 1...cassette, 3, 4...cassette through hole,
6, 7, 8... Height regulating member, 20, 21... Bearing, 22... Bearing sleeve, 23... Flange portion, 24... Flywheel member, 25... Capstan, 27... Capstan insertion Through hole,
28...excess portion, 29...recess formed in the flywheel member.

Claims (1)

[Scope of utility model registration request] a height regulating member that comes into contact with the outer surface of the cassette to be mounted; a position regulating member that is inserted into a position regulating hole provided in the cassette to regulate the horizontal position of the cassette; and an inner periphery of the hole. a biasing member that presses the cassette from the back side so that its surface comes into contact with the position regulating member; a substrate; a bearing sleeve provided in the bearing sleeve for supporting a capstan, and a flywheel member integrally fixed to the capstan, the flywheel member being concentric with the flywheel member along the axial direction of the capstan. The lower end of the bearing sleeve is inserted into the recess, and the upper end of the bearing sleeve protruding from the substrate side has a diameter smaller than that of the through hole for inserting the capstan of the cassette. and has a smaller diameter than the lower end side, and this bearing sleeve is placed on the inner circumferential surface of the through hole for inserting the capstan of the cassette held and positioned by the height regulating member, the urging member, and the position regulating member. A cassette tape recorder configured such that when inserted, the upper end outer peripheral surface of the bearing sleeve does not come into contact with the inner peripheral surface of the through hole for inserting the capstan.