KR100261612B1 - Rotary head apparatus for autoreverse-type tape recorder - Google Patents

Abstract

(Problem) The part machining process can be reduced, as well as the assembly fixed water can be reduced, it can be provided at a low price, and the drive gear lever can be easily installed, and also during the rotational motion of the drive gear lever. Provided is a rotating head apparatus of an autoreverse tape recorder which can prevent the drive gear lever from being separated.

(Solution) The head holder 24 and the gear 27 that rotate in accordance with the traveling direction of the magnetic tape, the drive gear lever 41 meshing with the gear 27, and the drive gear lever 41 are rotatable. One end is caught by the head housing 23 and the gear 27 in which the supporting main shaft part 35 is integrally formed, and the other end is caught by the main shaft part 35 to rotate the gear 27 to a predetermined range end portion. It has a coil spring 42, the engaging projection portion 36 for hanging the other end of the coil spring 42 is integrally formed at the front end of the main shaft portion 35, the main shaft portion 35 is provided in the drive gear lever 41 A groove hole 41d through which the insertion hole passes through the shaft hole 41c and the locking projection 36 is formed.

Description

Rotary head unit of autoreverse tape recorder

The present invention relates to a rotary head apparatus of an autoreverse type tape recorder in a magnetic recording and reproducing apparatus capable of reciprocating recording and reproducing by switching a track position with respect to a magnetic tape by rotating a magnetic head.

Conventionally, a magnetic recording and reproducing apparatus capable of reciprocating recording and reproducing to switch track positions of a magnetic tape by rotating the magnetic head in accordance with a traveling direction of a magnetic tape running in a normal (electrostatic direction) and a reverse (reverse direction) is provided. It is becoming.

As such a magnetic recording and reproducing apparatus, that is, a rotating head apparatus of an autoreverse type tape recorder, there are ones shown in Figs. Fig. 7 is an exploded perspective view showing an example of a rotating head apparatus of a conventional autoreverse tape recorder, Fig. 8 is a front view showing a rotating head apparatus of the autoreverse tape recorder of Fig. 7, and Fig. 9 is a cutaway view of Fig. 8. 10 is explanatory drawing which expands and shows the pin for a shaft, and a drive gear lever.

The recording / reproducing head (hereinafter, referred to as recording / reproducing head) 1 and the erasing head 2 are fixed to the head holder 3, and the head holder 3 is attached to the head substrate 5 by screws 4. It is fixed to the disk part 6. The regulating protrusion 7 is formed in the outer peripheral part of the disc part of the head board | substrate 5, and the rotating shaft 8 is provided in the center part of the disc part 6 of the surface which opposes a head mounting surface. The rotary shaft 8 is rotatably fitted in the opening 10a of the head housing 10 via the sleeve bearing 9.

The head housing 10 is mounted on the chassis (not shown) so as to keep the rotation shaft 8 substantially horizontal. In the upper portion of the head housing 10, a restricting protrusion 7 abuts at the end of the rotational movement of the head substrate 5 to restrict the rotational movement range, and further comprises a stopper composed of screws for adjusting the holding position of the head substrate 5. The member 11 is provided. The stopper member 11 is twisted into the head housing 10 via a leaf spring 12 for fixing these stopper members 11 to a predetermined height. The gear 14 is integrally formed on the rotating shaft 8 via a spring washer 13 for preventing backlash in the thrust direction.

The drive gear lever 15 made of synthetic resin is provided in the head housing 10 so as to mesh with the gear 14. The drive gear lever 15 has a fan shape, and a tooth part 15a having teeth formed in an arcuate circumference thereof, and a lever part 15b extending from an end opposite to the tooth part 15a, that is, a fan shape center. Has The shaft hole 15c is drilled between the toothed portion 15a and the lever portion 15b, and the drive gear lever 15 is connected to the head housing 10 by inserting the shaft pin 16 through the shaft hole 15c. It is rotatably supported.

In addition, the lever part 15b of the drive gear lever 15 is located in the notch part of a thrust plate (not shown). The thrust plate (not shown) is provided so as to be movable in the rotational movement direction of the drive gear lever 15, and with the movement, the opposite edges of the cutout portions alternately contact the lever portion 15b so that the drive gear lever ( 15) Operate the rotary motion.

The shaft pin 16 is made of metal and is fixed to the head housing 10 made of synthetic resin by press-fitting. A locking groove 16a is formed over the entire circumference of the outer circumferential surface of the distal end of the shaft pin 16, and a hook of one end of the torsion coil spring 17 is fixed to the locking groove 16a. The hook of the other end of the torsion coil spring 17 is caught by the locking shaft 14a which protruded in the outer peripheral part of the gear 14. As shown in FIG. This torsion coil spring 17 rotates the gear 14 to a fixed angle by the rotational movement of the drive gear lever 15, and the torsion coil spring 17 has a dead point. When one end and the other end and the straight line connecting the pin 16 for a shaft are exceeded, the gear 14 is rotated by the reaction force of the torsion coil spring 17 after that. Reference numeral 18 is a flexible printed circuit board for making electrical connections to the recording / reproducing head 1 and the erasing head 2.

In such a conventional rotary head device of an autoreverse tape recorder, the position where the recording / reproducing head 1 and the erasing head 2 correspond to normal driving (hereinafter referred to as a normal position) or a position corresponding to reverse driving In the case of inverting to the opposite position (hereinafter referred to as "reverse switch"), the slide plate (not shown) first slides in accordance with the inversion instruction signal so that the lever portion 15b of the drive gear lever 15 is exemplified. For example, rotate in the right direction. By the counterclockwise rotation of the drive gear lever 15, the gear 14 rotates clockwise, so that the recording / reproducing head 1 and the erasing head 2 also rotate in the same direction. At the beginning of the rotational movement, the head substrate 5 is rotated in response to the spring force of the torsion coil spring 17, and the gear 14 is over the predetermined position (dead spot) by the slide plate (not shown). When it rotates, the gear 14 (head board 5) rotates clockwise again by the spring force of the torsion coil spring 17 this time. Then, the regulating projection 7 of the disc portion 6 abuts against the stopper member 11 so that rotational movement is prevented, and the regulating projection 7 is stopped by the spring force of the torsion coil spring 17. ), The recording and reproducing head 1 and the erasing head 2 are held at the normal position or the reverse switch.

By the way, in the said prior art, the drive gear lever 15 is rotatably supported by the metal shaft pin 16 press-fitted to the head housing 10, and the torsion coil spring ( A locking groove 16a for hooking one end of 17) is formed over the entire circumferential surface.

However, since the engaging groove 16a is formed in the small shaft pin 16, the machining of the parts becomes complicated and the machining cost is high. In addition, a fixed number for fixing the shaft pin 16 to the head housing 10 also increases, which is one cause of high cost.

The problem of the present invention is that the main shaft portion for the drive gear lever can be integrally formed in the head housing, so that the parts machining process and the number of assembly fixed water can be reduced, the low cost can be provided, and the shaft hole of the drive gear lever can be inserted. The drive gear lever can be easily installed by passing through it, and one end of the force (force) member can be hung on the main shaft, and the drive gear lever can be fitted even if the engaging projection and the groove are hit during the rotational movement of the drive gear lever. It is to provide a rotary head device of an autoreverse tape recorder which can prevent the separation of the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows each state at the time of normal and reverse running of the rotating head apparatus of the autoreverse type | mold tape recorder in one Embodiment of this invention.

2 is a longitudinal cross-sectional view of FIG. 1.

Fig. 3 is an explanatory diagram of a main part of a rotating head device of an autoreverse tape recorder according to one embodiment of the present invention.

It is a front view which shows the head housing of the rotating head apparatus of the autoreverse tape recorder in one Embodiment of this invention.

5 is a side view of FIG. 4.

(A), (b) is a front view and a longitudinal cross-sectional view which show the drive gear lever in one Embodiment of this invention.

7 is an exploded perspective view showing an example of a rotating head device of a conventional autoreverse tape recorder.

FIG. 8 is a front view illustrating a rotating head device of the autoreverse tape recorder of FIG. 7.

FIG. 9 is a plan view cut along a portion of FIG. 8. FIG.

It is explanatory drawing which expands and shows the pin for a shaft and the drive gear lever of the rotating head apparatus of the conventional autoreverse tape recorder.

* Explanation of symbols for main parts of the drawings

21: recording and playback head 22: erasing head

23: head housing 24: head holder

25 head substrate 25a regulating protrusion

27 gear 35 main shaft portion

36: locking projection 37: type separation hole

41: drive gear lever 41a: tooth part

41b: lever 41c: shaft hole

41d: groove hole 42: coil spring

The said subject is a rotating body which supports a magnetic head and rotates in a predetermined range according to the traveling direction of the magnetic tape which travels in an electrostatic direction and an inverting direction, the gear which rotates with the said rotating body, and the tooth which meshes with the said gear. A driving gear lever having a portion, a head housing rotatably supporting the rotating body, and a locking projection portion integrally formed at a portion of a leading edge of the shaft portion and the shaft portion rotatably supporting the drive gear lever to the head housing. The main shaft portion, the mold separation hole formed in the head housing corresponding to the locking projection portion, the shaft hole having a shape corresponding to the main shaft portion and the locking projection portion formed in the drive gear lever, and one end of the gear is caught, and the other end is The force applied to the main shaft portion, after the gear is rotated a predetermined angle by the rotational movement of the drive gear lever. And a force member for rotating the gear to an end of a predetermined range, the shaft hole of the drive gear lever is inserted into the main shaft portion, and the other end of the force member is connected to the engaging protrusion and the drive gear lever of the main shaft portion. It is solved by means for hanging on the groove-shaped portion formed by.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows each state at the time of normal and reverse run of the rotating head apparatus of an autoreverse tape recorder in one Embodiment of this invention, FIG. 2 is a longitudinal cross-sectional view of FIG. Main part explanatory drawing of the rotating head apparatus of the autoreverse type | mold tape recorder in one Embodiment, FIG. 4 is a front view which shows the head housing of the rotating head apparatus of the autoreverse type | mold tape recorder in one Embodiment of this invention. 5 is a side view of FIG. 4, and FIGS. 6A and 6B are front and longitudinal cross-sectional views showing the drive gear lever in one embodiment of the present invention.

For example, a head housing 23 is formed on the head base 20 of the autoreverse cassette tape recorder. As shown in FIG.4 and FIG.5, this head housing 23 has the bearing part 23a which supports a shaft so that the rotating shaft 26 mentioned later can rotate at the center, and a pair of stopper members mentioned later at both sides. Stopper member attaching portions 23b and 23b for providing the 31 and 31 are formed.

A metal head substrate 25 and a metal head holder 24 are fixed to one end of the rotating shaft 26 fitted to the bearing portion 23a of the head housing 23. The head holder 24 is provided with a recording / reproducing head 21 and an erasing head 22.

The gear 27 is cocked and attached to the other end of the rotating shaft 26. Between the gear 27 and the bearing portion 23a, a leaf spring 28 for preventing backlash in the thrust direction is interposed. In addition, a part of the outer circumference of the gear 27 is provided with a locking portion 27a that hangs one end of the coil spring 42 to be described later.

In addition, the head holder 24, the head board 25, the rotating shaft 26, etc. correspond to a rotating body.

Reference numeral 29 is a connection code for making electrical connection to the recording / reproducing head 21 and the erasing head 22.

In the head substrate 25, the regulating projection part 25a is bent in one place of the outer peripheral part, and this regulating projection part 25a is formed in two stopper member attachment parts 23b, 23b of the head housing 23. As shown in FIG. In contact with the stopper member 31 or 31, the range of rotational movement of the head substrate 25 is regulated.

The two stopper members 31 are composed of screws for adjusting the holding position of the head holder 24. These stopper members 31, 31 are the stopper member attaching portions 23b, 23b of the head housing 23. Are screwed into the upper frames of the two support plates 33 and 33 fixed by the fixing screws 32 and 32, respectively. By advancing and retreating the stopper members 31 and 31, fine adjustment of the stop position (adimus angle) of the recording / reproducing head 21 and the erasing head 22 can be performed.

Then, the lower end of one stopper member 31, as shown by the solid line in FIG. 1, when the traveling direction of the magnetic tape runs in the electrostatic direction, the recording / reproducing head 21 to perform recording and reproduction in the electrostatic direction. And the regulating protrusion 25a so as to position the erasing head 22, and the lower end of the other stopper member 31 has the magnetic tape reversed, as indicated by a dashed line in FIG. In this case, the regenerative projection portion 25a is disposed so as to position the recording / reproducing head 21 and the erasing head 22 which are rotated to perform recording / reproduction in the reverse direction.

Moreover, as shown in FIG. 4 and FIG. 5, the main shaft part 35 which rotatably supports the drive gear lever 41 mentioned later is formed in the lower part of the side of the head housing 23 integrally. The locking projection 36 is integrally molded downward from the tip of the main shaft portion 35. In the portion of the head housing 23 facing the locking projection 36, a string separation hole 37 is formed during molding, so that even if the locking projection 36 has an undercut shape, the molding die is not complicated. Molding processing of the head housing 23 can be performed. Reference numeral 38 is a tape guide formed in the head housing 23.

The drive shaft lever 41 made of synthetic resin is rotatably provided in the main shaft portion 35. As shown to Fig.6 (a), (b), this drive gear lever 41 has a fan-shaped part, the tooth part 41a by which the tooth was formed in the circular periphery part, this tooth part 41a, It has the lever part 41b extended from the opposite end part. Moreover, between the tooth | gear part 41a of the drive gear lever 41, and the lever part 41b, the shaft hole 41c through which the main shaft part 35 is inserted is drilled, and is lowered from the peripheral part of the shaft hole 41c. The groove hole 41d is formed.

This groove hole 41d corresponds to the locking projection 36 of the main shaft portion 35. When the groove 35 is inserted into the shaft hole 41c of the drive gear lever 41, the locking projection ( By joining the 36 and the grooved holes 41d, the drive gear lever 41 can be inserted into or removed from the main shaft portion 35. However, if the positions of the locking projections 36 and the grooved holes 41d are displaced, they are inserted. If the position of the locking projection 36 and the groove hole 41d is displaced after it is inserted, it cannot be removed.

After inserting the main shaft portion 35 into the shaft hole 41c of the drive gear lever 41 in this way, the groove-shaped portion formed by the engaging projection portion 36 and the drive gear lever 41 of the main shaft portion 35 is provided. The hook portion 42a of one end of the coil spring 42 is caught and fixed. The hook part 42b of the other end of this coil spring 42 is caught by the locking part 27a of the said gear 27. As shown in FIG. In addition, both hook portions 42a and 42b of the coil spring 42 are easy to hang from the center.

In addition, as in the conventional example, the spring force of the coil spring 42 acts automatically on the boundary between a straight line connecting the two hooks 42a and 42b of the coil spring 42 and the main shaft portion 35 to automatically rotate. It is supposed to be possible.

Next, the installation method of the said embodiment is demonstrated.

Installation of the drive gear lever 41 and the coil spring 42 with respect to the head housing 23, first, inserts the groove hole 41d of the drive gear lever 41 into the locking projection 36 of the main shaft portion 35. While making it match, the main shaft part 35 passes through the shaft hole 41c of the drive gear lever 41. Next, the other end of the coil spring 42 which has one end to the engaging portion 27a of the gear 27 is fastened to the main shaft portion 35. As a result, if the angle between the locking projection 36 and the groove hole 41d does not coincide, the driving gear lever 41 does not come out and is pressed by one end 42a of the coil spring 42, so that the driving gear lever 41 Even if the angle between the engaging projection portion 36 and the groove hole 41d coincides with each other during the rotation of the coil), it does not easily fall out.

In addition, since the inversion operation of the rotating head device of the autoreverse type tape recorder is the same as the conventional example described above, the description thereof is omitted. Moreover, in the said embodiment, although the force member is comprised by the coil spring, you may be comprised by the torsion coil spring similarly to the conventional example mentioned above.

In the above-described embodiment, the rotary bodies 24 and 25 that support the magnetic heads 21 and 22 and rotate in a predetermined range in accordance with the traveling direction of the magnetic tape traveling in the electrostatic direction and the reverse direction are rotated. The drive gear lever 41 which has the gear 27 which rotates with the whole 24 and 25, the toothed part 41a which meshes with the gear 27, and the rotation bodies 24 and 25 are rotatably supported. The main shaft portion 35 in which the locking projection 36 is integrally formed on the head housing 23 and the head housing 23 so as to rotatably support the drive gear lever 41. ), A shaft separation hole 37 formed in the head housing 23 in correspondence with the locking projection 36, a shaft hole in a shape corresponding to the main shaft portion 35 and the locking projection 36 formed with the drive gear lever 41. One end is caught by the 41c, the groove hole 41d, and the gear 27, and the other end is caught by the main shaft part 35, After the gear 27 is rotated by a predetermined angle by the rotational movement of the drive gear lever 41, a coil spring 42 is formed to rotate the gear 27 to the end of the predetermined range by the force applied thereto. The shaft hole 41c of the drive gear lever 41 is inserted into the portion 35, and the other end of the coil spring 42 is formed by the locking projection 36 and the drive gear lever 41 of the main shaft portion 35. Since it is caught by the groove-shaped part, since the string separation hole 37 was formed in the head housing 23 corresponding to the locking projection part 36, the main shaft part 35 and the locking projection part 36 were attached to the head housing 23. It can be easily laid by integral molding, and the parts processing process can be reduced, as well as the assembly process can be reduced, and a low price can be provided. In addition, by engaging the engaging projection portion 36 with the groove hole 41d, the drive gear lever 41 can be installed by simply passing the shaft hole 41c of the drive gear lever 41 into the main shaft portion 35. have. Moreover, one end 42a of the coil spring 42 can be hooked to the groove shape formed by the locking projection 36 of the main shaft part 35 and the drive gear lever 41, and the coil spring 42 By one end 42a of the driving gear lever 41, even if the engaging projection portion 36 and the groove hole 41d are fitted during the rotational movement operation of the driving gear lever 41, separation of the driving gear lever 41 can be prevented.

According to the present invention, since the mold separation hole is formed in the head housing in correspondence with the locking projection, the main shaft portion and the locking projection can be easily attached to the head housing by integral molding, and the part machining process can be reduced. Also, the assembly process can be reduced, so that it can be provided at a low price. Further, by engaging the engaging projection and the groove hole, the drive gear lever can be provided by simply passing the shaft hole of the drive gear lever into the main shaft portion. In addition, one end of the force member can be hooked to the groove-shaped portion formed by the locking projection and the drive gear lever of the main shaft, and one end of the force member allows the locking protrusion and the groove to be formed during the rotational movement of the drive gear lever. Even if it fits, the drive gear lever can be prevented from coming off.

Claims (1)

A rotating body supporting the magnetic head and rotating in a predetermined range according to the traveling direction of the magnetic tape traveling in the electrostatic direction and the reverse direction; A gear rotating together with the rotating body, A drive gear lever having a tooth portion engaged with the gear, A head housing rotatably supporting the rotating body; A main shaft portion in which the engaging projection is integrally formed on a part of the distal end of the shaft portion and the shaft portion, rotatably supporting the drive gear lever to the head housing; A type separation hole formed in the head housing corresponding to the locking projection; An axial hole corresponding to the main shaft portion and the locking projection portion formed in the drive gear lever, One end is caught by the gear, the other end is caught by the main shaft portion, and after the gear is rotated by a predetermined angle by the rotational movement of the drive gear lever, a force member for rotating the gear to the end of a predetermined range by the force applied thereto. Made up, The shaft hole of the drive gear lever is inserted into the main shaft portion, and the other end of the force member is hooked to the groove-shaped portion formed by the engaging projection portion of the main shaft portion and the drive gear lever, characterized in that the autoreverse tape recorder Rotary head device.

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