JPH0548252Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an auto-reversing tape recorder in which two track heads are reversed as the running direction of the tape is changed.

[Prior Art] Generally, the head of a tape recorder is made of permalloy or ferrite, and is relatively expensive. In particular, four-track heads for auto-reversing tape recorders are much more expensive than two-track heads. Therefore, in auto-reversing type tape recorders, it has recently been carried out to reverse the head by 180 degrees around an axis perpendicular to the tape contact surface when the tape running direction is changed.

FIG. 4 shows a head reversing mechanism in such an auto-reversing type tape recorder. The outline is as follows.

In FIG. 4, reference numeral 1 represents a two-track head (hereinafter simply referred to as head), and this head 1 is fixedly supported at the front end of a rotating body 2. As shown in FIG. Further, the rotating body 2 is rotatably supported by the head base 3, and is driven by a rotational drive mechanism (not shown).
Centered on the axis perpendicular to the tape contact surface of head 1.
It can be rotated in 180° increments. In other words,
There is a flat plate-shaped locking piece (locking part) on the outer periphery of the rotating body 2.
4 is provided so as to protrude outward in the radial direction. Further, a pair of azimuth adjustment screws 5, 5 are screwed into the head base 3, and the tip thereof is connected to the rotating body 2.
The locking piece 4 is projected into the rotation area of the locking piece 4. As a result, when the rotating body 2 rotates, the locking piece 4
comes into contact with the tip of the azimuth adjustment screw 5, thereby preventing rotation of the rotating body 2 and holding the head 1 in a fixed position. A compression coil spring 6 is interposed between the head of each azimuth adjustment screw 5 and the head base 3, and the upward elastic force of this compression coil spring 6 loosens the azimuth adjustment screw 5. Efforts are being made to prevent this.

In the auto-reverse tape recorder configured as described above, when the tape is running in one direction, the locking piece 4 of the rotating body 2 hits the tip of the azimuth adjustment screw 5 at part A in FIG. placed in close contact. On the other hand, when the end of the tape is detected, a head reversal drive mechanism (not shown) is activated by the end detection signal, and the rotating body 2 is rotated 180 degrees. 4 comes into contact with the tip of the other azimuth adjustment screw 5.

By the way, in a tape recorder having such a reversing mechanism, if the head 1 is tilted with respect to the tape running direction, the tip of the azimuth adjusting screw 5 can be adjusted by loosening or tightening the azimuth adjusting screw 5 as appropriate. The contact position between the rotary body 2 and the locking piece 4 is changed, thereby finely adjusting the head position.

[Problems to be solved by the invention] However, in a tape recorder having such a structure, although the compression coil spring 6 is used to prevent the azimuth adjustment screw 5 from loosening, it is difficult to prevent the azimuth adjustment screw 5 from loosening every time the head 1 is reversed. Since the locking piece 4 of the rotating body 2 collides with the tip of the azimuth adjustment screw 5 every time,
The azimuth adjustment screw 5 tends to loosen due to the impact force. If the azimuth adjustment screw 5 becomes loose, the position of the head 1 cannot be regulated with high precision, and as a result, the frequency characteristics of tape recording and reproduction deteriorate.

On the other hand, in order to prevent the azimuth adjustment screw 5 from loosening due to the impact force of the rotating body 2, it is possible to use a strong compression coil spring 6, but in this case, the elastic force of the compression coil spring 6 In order to withstand it, it is necessary to reduce the pitch of the threads of the azimuth adjustment screw 5, make the head base 3 thicker, and increase the threaded length of the azimuth adjustment screw 5. As a result, it becomes difficult to process the screw holes. Furthermore, if a strong compression coil spring 6 is used, there is also the problem that azimuth adjustment becomes difficult.

The present invention has been devised in view of these problems, and provides an auto-reverse tape recorder that can effectively prevent the azimuth adjustment screw from loosening and further stabilize the frequency characteristics of tape recording and playback. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an auto-reversing tape recorder with a locking part that reverses motion integrally with the head, and is approximately U-shaped with azimuths at both ends. It is equipped with a stopper member made of a single leaf spring, which has separate azimuth adjustment parts equipped with screw insertion holes through which adjustment screws are inserted, and stopper parts that regulate the position of the head by abutting the above-mentioned locking parts. be.

[Function] According to the above-described means, the locking portion, which rotates integrally with the rotation of the head, comes into contact with the stopper portion of the stopper member made of a single leaf spring. In this case, the impact force is absorbed exclusively by the elasticity of the stopper portion, and the impact force is not transmitted to the azimuth adjustment screw, so that loosening of the azimuth adjustment screw is effectively prevented. As a result, the position of the head can be regulated with high precision, and the frequency characteristics of tape recording and playback are stabilized.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show a head reversing mechanism in an embodiment of an auto-reversing tape recorder according to the present invention.

In the figure, numeral 11 represents a head,
This head 11 is fixedly supported at the front end of a rotating body 12. An engaging portion, that is, a flat locking piece 13 is provided on the outer periphery of the rotating body 12 so as to protrude outward in the radial direction. Further, a small diameter portion 14 is provided at the rear end of the rotating body 12.
The rotating body 12 thus constructed is attached to the head base 15 so as to be rotatable about an axis C perpendicular to the tape contact surface.

That is, the head base 15 is formed such that a housing portion for the rotating body 12 is surrounded by the surrounding wall 16. A fitting hole 17 is provided in the front wall of the surrounding wall 16 that defines this storage section. On the other hand, a fitting hole 18 for receiving the small diameter portion 14 is provided in the rear wall of the head base 15. Then, the rotating body 1 with the locking piece 13 horizontal
2 can be inserted through the insertion hole 17, and when the rotating body 12 is inserted, that is, when the rotating body 12 is stored in the storage section, the rotating body 12
The small diameter portion 14 of the hole 14 is adapted to be received in the other insertion hole 18. In this case, the tip of the small diameter portion 14 of the rotating body 2 is projected outward from the rear wall.

Further, in the storage portion of the head base 15, a stop member 19 made of a single leaf spring and having a substantially U-shape is provided. This single leaf spring stopper member 19
has an azimuth adjustment part 21 in which a screw insertion hole 20 is formed at both ends thereof, and a tongue-shaped stopper part 22 branched from this adjustment part 21, as shown in FIG. , its base portion is placed below the rotating body 12, and each end thereof is placed on the side of the rotating body 12, respectively. The single leaf spring stopper member 19 is attached to the head base 15 through the screw insertion hole 20 of the azimuth adjustment section 21.
Azimuth adjustment screw 23 inserted into (see Figure 3)
This is done by screwing the head into a screw hole 24 provided in the floor wall of the head base 15. In that case, the azimuth adjustment screw 23 is a stopper member 19 made of a single leaf spring.
The elasticity of the azimuth adjustment screw 23 causes it to spring upward, thereby preventing the azimuth adjustment screw 23 from loosening. Also,
In this single leaf spring stopper member 19,
When the azimuth adjustment screw 23 is tightened or loosened, the stopper section 22 is connected to the azimuth adjustment section 21.
The displacement follows. On the other hand, the stopper part 22 of the stopper member 19 made of a single leaf spring is placed in the rotation area of the locking piece 13 of the rotating body 12 after it is attached. The rotation range of the rotating body 12 is regulated by the engagement of the rotating body 12. In addition, a square hole 3 for positioning is provided at the base of this single leaf spring stopper member 19.
3 is provided, and when installing it, each columnar protrusion 34 provided on the head base 15 is fitted into this square hole 33 for positioning, and thereby the single leaf spring stopper member 19 Positioning and rotation are prevented.

On the other hand, at the tip of the small diameter portion 14 of the rotating body 12 that projects outward from the rear wall of the head base 15,
A gear 25 is attached via a spring 40. Furthermore, this gear 25 has, as shown in FIG.
Overlapping gears 26 are meshed. This polymer gear 2
6 is a sector gear 27 meshed with the gear 25
and a pinion 28 coaxially and integrally provided with the sector gear 27. The latter pinion 28 is meshed with a rack 29. The rack 29 is also provided with a locking pawl 35, which is engaged with a switching rotation plate 36 that rotates around a capstan (not shown) as the running direction of the tape changes. It is becoming more and more common. This switching rotation plate 36 is provided with a pair of claws 37 and 38.
6 is rotated, the pawls 37 and 38 alternatively come into contact with the pawl 35 of the rack 29, the rack 29 is moved, and the overlapping gear 26 and the gear 2
The rotor 12 is rotated through the rotor 5. At this time, a predetermined gap is formed between the other claw of the switching rotation plate 36 and the claw 35 of the rack 29. Also, easy 2
A reversing spring 30 is stretched between the head 9 and the rear wall of the head base 15. The reversing spring 30 has a maximum compression energy when the locking piece 13 of the rotating body 12 is in a neutral position, that is, standing upright in the vertical direction.
When the locking piece 13 is biased to either side, the compression energy is released. With such a configuration, the locking piece 13 of the rotating body 12
can be brought into reliable contact with the stopper member 19 made of a single leaf spring. The reason for this is explained below.

In other words, in the auto-reverse type tape recorder, the amount of movement of the switching rotation plate 36, which rotates as the tape running direction changes, is always constant. Therefore, when adjusting the azimuth, the rotating body 12 may be
The locking piece 13 may not come into contact with the stopper portion 22 of the stopper member 19 made of a single leaf spring. In this case, the opening force of the reversing spring 30 is used to ensure that the locking piece 13 of the rotating body 12 is brought into contact with the stopper member 19 made of a single leaf spring.

According to the tape recorder configured in this way, when the tape is traveling in one direction, the locking piece 13 of the rotary body 12 is attached to the stopper member 19 made of a single leaf spring at a portion A in FIG. It is placed in a state where it is in contact with the stopper part 22. On the other hand, when the end of the tape is detected, the switching rotary plate 36 is activated by the detection signal.
is activated, thereby rotating the rotating body 12 by 180 degrees, and this time, at the B section, the locking piece 1 of the rotating body 12 is rotated 180 degrees.
3 is brought into contact with the other stopper portion 22. Also,
At that time, the locking piece 13 of the rotating body 12
The impact force generated when the stopper part 2 comes into contact with the stopper part 2
As a result, the impact force is not transmitted to the azimuth adjustment section 21 and even to the azimuth adjustment screw 23.

Therefore, with the auto-reverse tape recorder configured in this manner, loosening of the azimuth adjustment screw 23 due to the reversing operation of the head can be effectively prevented. Further, the impact force generated when the locking piece 13 of the rotating body 12 comes into contact with the stopper part 22 of the single leaf spring stopper member 19 is absorbed only by the stopper part 22 of the single leaf spring stopper member 19. Therefore, the single leaf spring stopper member 19
As such, it does not require a large elastic force. Therefore, there is no problem with azimuth adjustment. In addition, in the single leaf spring stopper member 19, the stopper part 2 is located inside the azimuth adjustment part 21.
2 is formed, so the azimuth adjustment screw 23
When tightening or loosening, the displacement of the stopper section 22 is smaller than that of the azimuth adjustment section 21.
Therefore, according to the tape recorder of this embodiment, fine adjustment of the head position is possible.

[Effects of the invention] As is clear from the above explanation, according to the invention, a locking part that rotates in reverse is provided integrally with the head, and a screw that is approximately U-shaped and through which azimuth adjustment screws are inserted is provided. Since it is equipped with a stopper member made of a single leaf spring that has an azimuth adjustment part with an insertion hole and a stopper part that controls the position of the head by bringing the above-mentioned locking part into contact with the stopper member, the impact caused by the collision of the locking part can be avoided. The force can be alleviated only by the stopper portion, and loosening of the azimuth adjustment screw is effectively prevented. As a result, the position of the head can be regulated with high precision, and the frequency characteristics of tape recording and playback are stabilized.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a head reversing mechanism which is a main part of an embodiment of an auto-reversing tape recorder according to the present invention, FIG. 2 is a rear perspective view of the head reversing mechanism of FIG. 1, and FIG. The figure is a front view of the rotating body and the stopper member made of a single leaf spring in the head reversing mechanism shown in FIG. 1, and FIG. 4 is a front view of the conventional head reversing mechanism. 11...head, 13...locking piece (locking part),
19...Single plate spring stopper member, 20...Screw insertion hole, 21...Azimuth adjustment part, 22...Stopper part.

Claims (1)

[Scope of utility model registration request] 2. Move the track head around the axis perpendicular to the tape contact surface as the tape travel direction changes.
In a tape recorder that rotates in 180° increments, a locking portion that rotates integrally with the head is provided, and the azimuth adjustment portion is approximately U-shaped and has screw insertion holes at both ends through which azimuth adjustment screws are inserted, and the locking portion is provided. 1. An auto-reversing tape recorder comprising a stopper member made of a single leaf spring and a stopper member for regulating the position of the head by contacting the stopper member.