JPS6349876Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse drive mechanism for a tape recorder using a tape cassette.

Conventionally, as shown in FIG. 1, this type of tape recorder has flywheels 2a and 2b that are driven to rotate in forward and reverse directions by a motor 1, and capstan shafts 3a and 3b that rotate integrally with the respective flywheels. It has a pair of pinch rollers 4a and 4b which are arranged so as to be able to move toward and away from the capstan 3a and 4b. As shown in FIG. 1b, there is a device in which the capstan 3b and the pinch roller 4b are selectively brought into contact with each other. Also, as in the example shown in FIGS. 2 and 3, a pair of flywheels 2 are driven by the motor 1.
In the case of so-called closed loop drive in which the pinch rollers 4a and 4b are driven to rotate in the same direction and the pair of pinch rollers 4a and 4b are brought into contact with the pair of capstan shafts 3a and 3b at the same time, the rotation direction of the motor 1 is rotated in the forward and reverse directions. This reverses the running direction of the tape.

However, in the above-mentioned conventional examples, a pair of flywheels and a pair of pinch rollers are required, which not only increases the load on the capstan motor but also takes up space and is not suitable for downsizing tape recorders. Nakatsuta.

The object of the present invention is to provide a reverse type cassette tape recorder suitable for downsizing.

An embodiment of the reverse type cassette tape recorder according to the present invention will be described below with reference to the drawings.

In FIG. 4a, 12 is a flywheel rotationally driven by a motor, 13 is a capstan, 14 is a pinch roller, and 15 is an intermediate gear. A belt 16 shown by a dashed line is placed between the flywheel 12 and the intermediate gear 15, and is driven to rotate in accordance with the rotational direction of the flywheel. 17 and 18 are reel stand gears connected to the left and right reel stands via a slip mechanism;
is a reversing gear. This reversing gear 19 has a known configuration, and is always in mesh with the intermediate gear 15 and moves around this intermediate gear according to the rotating direction of the intermediate gear 15. It makes contact and applies winding torque.

Now, as shown in FIG. 4a, when the flywheel 12 and intermediate gear 15 are rotationally driven in the counterclockwise direction by a motor (not shown), the reversing gear 19 applies winding torque to the reel stand gear 18, causing the tape to move in the forward direction. When the tape runs and the flywheel 12 and intermediate gear 15 are rotated clockwise as shown in FIG. 4b, the reversing gear 19 applies winding torque to the reel stand gear 17, and the tape runs in the opposite direction.

In this embodiment, an example is shown in which the recording and playback functions are provided when traveling in the forward direction, and only the playback function is provided when traveling in the reverse direction.Therefore, in FIG. Although the head 21 is in contact with the tape, in FIG. 4b only the recording/reproducing head 21 is in contact with the tape. However, by using the small windows 22, 23, etc. on the front of the tape cassette, it is also possible to provide a recording function when the tape is running in both directions.

When the tape is running in the forward direction as shown in FIG. 4a, the winding torque for reel 18 is
3. The tension may be set to a value that applies an appropriate tension to the tape 24 fed out by the pinch roller 14, but when the tape is running in the reverse direction as shown in FIG. Since friction loss occurs due to the inner guide pin, the winding torque of the reel stand 17 on the magnetic head side needs to be set about 1 to 2 times larger than that of the reel stand 18 on the pinch roller side.

In order to provide the above-mentioned difference in winding torque, for example, by setting the compression force of the compression springs 31a and 31b of the slip mechanism of the left and right reel stands shown in FIG. 5 to F, 31a<F31b. Can be set to In addition, in Fig. 5, 32a, 3
2b is a hub drive shaft, and 33a and 33b are slip felts. In this case, a description of the drive system for high-speed feeding has been omitted for simplicity, but if the winding torque is sufficiently high, there is no need to provide a rotation transmission system for high-speed feeding.

In the embodiments, a drive system using a belt or gears is shown as an example, but it goes without saying that a system using an idler or the like is also possible.

As described above, the reverse type cassette tape recorder according to the present invention has one capstan shaft inserted into the tape cassette, and a magnetic head that contacts the tape inserted from the front surface of the tape cassette. A pinch roller is inserted to sandwich the tape between the tape and the capstan shaft, and a pair of reel stands with different take-up torques are provided. The winding torque of the reel stand on the pinch roller side is set to be larger than that of the reel stand, and the tape is made to run in forward and reverse directions using the same set of capstan shaft and pinch roller in the rotating direction of the capstan shaft.

Therefore, according to the present invention, it is possible to realize a reverse type cassette tape recorder by simply preparing one set of a capstan shaft and a pinch roller, and the structure is simple and the tape recorder can be miniaturized. Furthermore, since the winding torque of the reel stand on the magnetic head side is increased, there is no need to switch the rotation transmission mechanism during high-speed feeding, and the configuration can be further simplified.

[Brief explanation of the drawing]

Figures 1a and 1b are schematic diagrams of the drive system of a conventional reverse type cassette tape recorder, and Figures 2 and 3 are
The figure is a schematic diagram of the drive system of a conventional dual-capstan closed-loop reverse type cassette tape recorder, and Figure 4a is an embodiment of the present invention.
A plan view showing the drive system when driving in the forward direction, FIG. 4b is also an embodiment of the present invention, and a plan view showing the drive system when driving in the reverse direction, FIG.
-A' sectional view. 13...capstan shaft, 14...pinch roller, 17, 18...reel stand gear, 21...recording/playback head, 24...tape.

Claims (1)

[Scope of utility model registration request] The tape is held between a capstan shaft inserted into the tape cassette, a magnetic head inserted from the front of the tape cassette and in contact with the tape, and the capstan shaft also inserted from the front of the tape cassette. and a pair of reel stands with different take-up torques, and of the pair of reel stands, the take-up torque of the reel stand on the magnetic head side is equal to the take-up torque of the reel stand on the pinch roller side. A reverse type cassette tape recorder in which the rotation direction of the capstan shaft is reversed so that the same pair of capstan shafts and pinch rollers are used to run the tape in forward and reverse directions.