JPH0535448Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a cassette tape recorder having a playback function in a first direction and a playback function in a second direction opposite to the first direction. In particular, the present invention relates to a support device for a magnetic head.

(b) Prior Art Cassette-type tape recorders that use a cassette tape in which a magnetic tape is stored in a container called a cassette have become widespread. Such a cassette type tape recorder has a function to continuously perform not only a playback operation in the first direction but also a playback operation in the second direction, which is the opposite direction to the first direction, because it is necessary to perform a playback operation for a long time. The number of vehicles equipped with a function called auto-reverse is increasing. A tape recorder equipped with such an auto-reverse function is configured to switch the magnetic tape drive mechanism and magnetic head in accordance with the playback direction. Furthermore, among cassette-type tape recorders, there is an ultra-compact tape recorder that uses a cassette tape called a microcassette (product name), but even tape recorders that use such a microcassette can play back for long periods of time. There is a demand for an auto-reverse function in the vehicle, and such technology is disclosed in, for example, Japanese Utility Model Publication No. 62-24344.

(c) Problems to be solved by the invention The above-mentioned publication states that a seesaw type head board on which two magnetic heads are fixed is rotatable on a movable board that is displaceable with respect to a fixed board. The installed technology is described. In a tape recorder incorporating such technology, when the thickness of the tape recorder is reduced, the thickness of each substrate inevitably becomes thinner, and as a result, there is a problem that the supporting operation of the magnetic head becomes unstable. The present invention aims to provide a magnetic head support device that is improved in this respect.

(d) Means for Solving the Problems The magnetic head support device of the present invention has a capstan shaft whose rotation direction can be switched in accordance with the playback direction, and a capstan shaft which is rotatably attached to a fixed board and which stops during playback operation. A rotary base plate that can be displaced from a position to a playback operation position, and a rotary base plate that is rotatably attached to a rotation center shaft fixed to the rotary baseplate, and that is pressed against a capstan shaft when the rotary baseplate is in the playback operation position. A pinch roller that can be pressed,
a head board that is rotatably mounted around the rotation center shaft and has magnetic heads fixed to both sides of the pinch roller; and a head board that is arranged parallel to the fixed board and above the head board. The spring includes an upper substrate, and a spring that is attached between the head substrate and the rotating substrate and urges the head substrate in the vertical direction about the rotational center axis.

(E) Function The present invention urges the head board in the vertical direction using the central axis of rotation as a fulcrum, and also prevents the positioning pins provided on the bottom surface of the head board from coming into contact with the fixed board and the top surface of the head board. The head board is positioned by the provided positioning piece coming into contact with the top board.

(F) Embodiments The drawings are all related to the present invention; FIG. 1 is a partially sectional front view, and FIG. 2 is a plan view of the main part. In the figure, reference numeral 1 denotes a capstan shaft which is inserted into a capstan hole (not shown) formed in the front central part of the microcassette and drives the magnetic tape T to run at a constant speed, and is used for playback operation in the first direction. It is configured to rotate in a clockwise direction and to be driven to rotate in a counterclockwise direction during a reproducing operation in a second direction. Reference numeral 2 denotes a rotary board rotatably attached to the fixed board 3 by a shaft 4, and when the regeneration operation is performed, the second
It is configured to be displaced to a regeneration operation position that is displaced counterclockwise from the stop position shown in the figure. Reference numeral 5 denotes a rotation center shaft fixed on the rotation base plate 2; 6 is a head base plate mounted on the rotation base plate 2 so as to be rotatable about the rotation center shaft 5; , a rising receiving portion 8 formed perpendicularly to the substrate portion 7, an upper surface portion 9 extending from the rising portion 8 and provided parallel to the substrate portion 7, and a folding portion formed perpendicularly to the rising portion 8. It is composed of a curved section 10. Reference numeral 11 denotes a pinch roller which is rotatably attached to the rotation center shaft 5 between the base plate portion 7 and the upper surface portion 9 constituting the head substrate 6 , and is pressed against the capstan shaft 1 during the regeneration operation. It has the function of driving the magnetic tape T to run at a constant speed. Reference numeral 12 denotes a first magnetic head which is fixed to the first magnetic head mounting portion 7a constituting the substrate portion 7 of the head substrate 6 by a fixing screw 13 and an azimuth adjustment screw 14, and is fixed to the first magnetic head mounting portion 7a constituting the substrate portion 7 of the head substrate 6. Magnetic tape T during playback operation
It has the function of reproducing the signal recorded on the magnetic tape T by contacting with the magnetic tape T. Reference numeral 15 indicates a fixing screw 16 and an azimuth adjustment screw 1 attached to the second magnetic head mounting portion 7b constituting the substrate portion 7 of the head substrate 6 .
A second magnetic head is fixed by 7 and has the function of coming into contact with the magnetic tape T during reproduction operation in the second direction and reproducing the signal recorded on the magnetic tape T. Reference numeral 18 is connected above the head board 6 by means of a support 19 provided on the shaft 4 on which the rotary board 2 is rotatably mounted, and a support 21 provided on the shaft 20. This is the top board that is mounted and fixed so that it is parallel to the . Reference numeral 22 denotes a bent portion 1 whose one end is attached to a mounting piece 23 formed on the rotating base plate 2 and the other end is formed on the head base plate 6 .
0, which biases the head board 6 counterclockwise around the rotation center shaft 5, and also in the vertical direction, that is, in the direction of arrows A and B in FIG. It has the effect of urging the A positioning piece 24 is formed at the end of the first magnetic head mounting portion 7a to which the first magnetic head 12 is fixed, and is in contact with the lower surface of the upper substrate 18. It has the function of positioning 7a. Reference numeral 25 denotes a positioning pin provided on the lower surface of the second magnetic head mounting portion 7b to which the second magnetic head 15 is fixed.
It has the function of positioning the second magnetic head mounting portion 7b.

The magnetic head support device of the present invention is constructed as described above, and its operation will be explained next. When the user performs a regeneration operation, the rotation base plate 2 is rotated from the stop position shown in FIG. 2 to the regeneration operation position by the action of the regeneration operation lever. When the rotary base plate 2 is displaced to the playback operation position, a pinch roller 11 is rotatably mounted on the rotary base plate 2.
is brought into pressure contact with the capstan shaft 1, and the magnetic tape T is driven to travel at a constant speed. and,
When the regeneration operation in the first direction is performed, the head board 6 is biased by the biasing force of the spring 22.
is rotated counterclockwise, and the first magnetic head 12 comes into contact with the magnetic tape T.
Therefore, signals such as music recorded on the tracks in the first direction of the magnetic tape T are transferred to the first magnetic head 1.
2, and the user can listen to the reproduced sound. In this way the first
However, when a playback operation is performed in the second direction or a playback direction switching operation is performed, the capstan shaft 1 is rotated in the opposite direction and the head board 6 is activated by a switching mechanism (not shown). is rotated clockwise against the biasing force of the spring 22. When the head board 6 is rotated clockwise, the second magnetic head 15 comes into contact with the magnetic tape T. Therefore, the signal recorded on the track in the second direction of the magnetic tape T is reproduced by the second magnetic head 15, and the user can listen to the reproduced sound. The regeneration operation is performed in this manner, and when the regeneration operation is performed, the head board 6 is urged in the directions of arrows A and B with the rotation center shaft 5 as a fulcrum by the urging force of the spring 22. be. Therefore, the positioning piece 24 formed on the head board 6 is pressed against the lower surface of the upper board 18, and the first magnetic head mounting portion 7a of the head board 6 is positioned. Become. Further, the positioning pins 25 provided on the lower surface of the head board 6 are pressed against the fixed board 3, and the positioning of the second magnetic head mounting portion 7b of the head board 6 is performed. . Therefore, by adjusting the azimuths of the first magnetic head 12 and the second magnetic head 15 using the azimuth adjusting screws 14 and 17, the azimuths of the magnetic heads 12 and 15 can be held accurately.

In this embodiment, the reproduction operation has been explained, but the first magnetic head 12 and the second magnetic head 15
Of course, the recording operation can be performed by using a magnetic head in which a recording/reproducing head and an erasing head are respectively incorporated.

(g) Effects of the invention The magnetic head support device of the invention biases the head board in the vertical direction about the central axis of rotation as a fulcrum, and also allows the positioning pins provided on the lower surface of the head board to come into contact with the fixed board. Since the head board is positioned by the positioning piece provided on the top of the head board coming into contact with the top board, even if the thickness of the head board becomes thinner, the magnetic head can be positioned accurately. Can be held in position,
The present invention has a very large effect when applied to an ultra-small tape recorder.

[Brief explanation of the drawing]

The drawings all relate to the magnetic head support device of the present invention; FIG. 1 is a partially sectional front view, and FIG. 2 is a plan view of the main parts. Explanation of main drawing numbers, 1...capstan shaft, 2...
...Rotating board, 3... Fixed board, 5... Rotation center axis, 6 ... Head board, 11... Pinch roller, 12... First magnetic head, 15... Second magnetic head, 18... Top surface Substrate, 22... Spring, 24... Positioning piece, 25... Positioning pin, T... Magnetic tape.

Claims (1)

[Scope of utility model registration request] In a cassette type tape recorder having a playback function in a first direction and a playback function in a second direction opposite to the first direction, a capstan shaft whose rotating direction can be switched in accordance with the playback direction, and a fixed substrate are connected. a rotary base plate which is rotatably mounted and is displaced from a stop position to a regeneration operation position during regeneration operation; a pinch roller that is brought into pressure contact with the capstan shaft when the board is in a playback operation position; and a head board that is rotatably mounted by the rotation center shaft and has magnetic heads fixed to both sides of the pinch roller. an upper substrate disposed parallel to the fixed substrate and above the head substrate; and a top substrate mounted between the head substrate and the rotating substrate, with the head substrate pivoted about the rotation center axis. The positioning pin provided on the bottom surface of the head board contacts the fixed board, and the positioning piece provided on the top surface of the head board contacts the top board. 1. A magnetic head support device for a cassette type tape recorder, characterized in that the head substrate is positioned by contact.