JPS6128272Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to provide a new and reliable automatic reversing device for use in tape players, particularly cassette type tape players.

The configuration of this project is explained based on the drawings.
11 is a first electric motor, and 11 is a first pulley fixed to the rotating shaft of the electric motor 10. This pulley transmits its rotational force through a belt 14 that is commonly stretched around the flywheels 12 and 13. 15 and 16 are capstan shafts which are extensions of the rotating shafts of the flywheels 12 and 13, 17 and 18 are pinch rollers corresponding to each of the flywheels 12 and 13, and 19 and 20 are reel stands for cassette tapes. be. A reversing lever 21 is provided between the reel stands 19 and 20, one end of which is rotatably pivoted so as to be displaced therebetween. A rotary member 22 is rotatably connected to a second electric motor 23 whose rotating direction is switched in accordance with the reversing operation of the reversing lever 21.
The pulley 2 is pressed against the pulley 24 of the belt 25 and the rotating member 22 via the friction mechanism 26.
They are connected via 7. 28 is reversing lever 2
This is a reversal spring that maintains the inverted state of 1.
29 is an electromagnet whose movable piece 30 is actuated to engage the protrusion 22' of the pulley 27 when it is energized when the cassette tape reaches its end or by a manual reversing operation; 31 is the second electromagnet; This is a polarity changeover switch operating lever that operates a changeover switch (not shown) that changes the rotation direction of the electric motor 23.

The operation of the above configuration will be explained. First, when the first electric motor 10 rotates in the direction of the arrow, the flywheels 12 and 13 rotate in the direction of the arrow via the pulley 11 and belt 14. Then, the cassette tape held between the capstan 15 and the pinch roller 17 is run in one direction. On the other hand, at this time, when the second electric motor 23 rotates in the direction of the arrow, the rotating member 22 rotates in the direction of the arrow via the belt 25, and the reel stand 19 to which the rotating member 22 is pressed rotates in the direction of the arrow, and runs. Wind up the cassette tape. In this case, when the cassette tape reaches the end, the electromagnet 2 is activated by an electric signal generated by an end detection device (not shown).
9 is energized and the movable piece 30 is operated. When the actuated movable piece 30 engages with the protrusion 22' of the pulley 27 and tries to prevent the rotation of the rotating member 22,
The reversing lever 21 to which the rotating member 22 is rotatably pivoted rotates against the reversing spring 28,
Eventually, the dead point of the reversing spring 28 is overcome, and the rotating member 22 comes to be pressed against the reel stand 30. During the above rotation of the reversing lever 21, the polarity changeover switch is switched by the operating lever 31, and the rotation direction of the second electric motor 23 is reversed. As a result, the cassette tape is now held between the capstan 16 and the pinch roller 18 and run, and is wound up by the reel stand 20.

The circuit shown in FIGS. 3 to 5 is for deenergizing the electromagnet 29 at an appropriate time to ensure reliable operation of the automatic reversing mechanism. Electromagnet 29 is connected between the power supply and ground through the emitter-collector path of transistor 40, the base of which is connected to the output of a reset-set (RS) flip-flop 41. Since flip-flop 41 is normally in the reset state and its output is at a high level,
Transistor 40 is in a non-conducting state. The flip-flop 41 has its set input connected to the outputs of the tape end detection circuit 12 and manual reversing circuit 43, and outputs signals generated at the outputs of each circuit when the tape reaches its end or when a manual reversing operation is performed. is set by , and its output goes low. At this time, the transistor 40 becomes conductive and the electromagnet 29 is energized.

45 is a polarity changeover switch operated by the rotation of the above-mentioned reversing lever to change the direction of rotation of the electric motor 23; 46 is a switch for changing the rotational speed of the electric motor 23 to fast-forward or rewind the tape; When the tape is running, the electric motor 23 is energized via the power switch 47, the resistor 48, and the changeover switch 45, and the electric motor 23 is rotated at a relatively slow speed. Each end of the motor 23 is connected to the base of a transistor 52 via diodes 49 and 50, respectively, and a common resistor 51. Transistor 52 has an emitter-collector path connected between the power supply and ground, and when its base potential becomes low in the process of switching switch 45, its conductive emitter output goes to a low level. The emitter of this transistor 52 is connected to the input of a one-shot 53 which generates a pulse of a fixed duration in response to a change in the potential from a low level to a high level.
One shot 53 generates a pulse that changes from high to low to high, which resets flip-flop 41 and changes its output from a low level to a high level. As a result, the electromagnet 29, which had been energized until then, is deenergized, and the movable piece 30 of the electromagnet 29 is moved away from the rotation orbit of the engagement protrusion 22' of the rotating member 22.

FIG. 4 shows a circuit for resetting the flip-flop 41 by a signal generated by a switch 55 operated by the reversing lever 21, which is separate from the polarity switch 45 of the motor 23.

FIG. 5 shows an example in which a multivibrator 56 with a reset input is used in place of the flip-flop 41.

According to the present invention described above, the power of the electric motor is transmitted to the reversing mechanism, which is a relatively large load for automatically reversing the tape running direction, by a relatively small electromagnet. It is possible to obtain an automatic reversing device that is simple in structure and inexpensive, and also operates reliably because the energization of the electromagnet is removed in accordance with the reversal of the rotational direction of the electric motor.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of its main parts, Fig. 2 is a side view thereof, Fig. 3 is a circuit diagram used in this invention, and Fig. 4 is a diagram of the circuit of Fig. 3. FIG. 5 is a circuit diagram showing the first modified example, and FIG. 5 is a circuit diagram showing the second modified example. In the figure, 10 and 23 are electric motors, 12 and 13 are flywheels, 19 and 20 are reel stands, and 21
29 is an electromagnet, and 45 and 55 are switches.

Claims (1)

[Scope of utility model registration request] It is equipped with a pair of flywheels driven by a belt by an electric motor, and a reel stand for a cassette provided for each flywheel, and the electric motor is mounted on a reversing lever rotatably provided so as to be displaced between the reel stands. A rotary member is rotatably driven by and selectively pressed against one of the reel stands to rotate the reel stand, and an electromagnet is movable which is energized by an electric signal generated at the end of the cassette tape. The reversing lever is rotated by engaging an engagement portion that has the same center of rotation as the rotational member and co-moves with the rotational member, thereby changing the rotational direction of the electric motor that rotationally drives the rotational member. In the automatic reversing tape player, the tape player is configured to reverse the reel and switch the pressure contact of the rotating member against the reel stand from one side to the other, further comprising means for releasing the energization of the electromagnet in response to rotation of the reversing lever. An automatic reversing tape player comprising: