JPH0533329U - Rotating magnetic head device - Google Patents

Abstract

(57) [Abstract] [Purpose] The tape guide for accurately guiding the magnetic tape to the magnetic gap of the magnetic head can be easily attached and the position can be adjusted, and the tape guide is less likely to be stuck. A structure of a rotary magnetic head device is provided. A flat surface portion 13b is formed on a side surface of a rotary pedestal 13 to which a magnetic head 11 is fixed, and a projection portion 15 is provided on the flat surface portion. After the tape guide 14 for guiding the magnetic tape in the traveling direction is engaged with the protruding portion 15 and the position thereof is adjusted on the flat surface portion 13b, the tape guide 14 is fixed on the flat surface portion 13b. The rotary pedestal has a projecting piece 17 that is loosely fitted in the guide groove 14d of the tape guide, and the claw portion 16 provided at the tip of this projecting piece cooperates with the flat surface portion 13b to sandwich the tape guide,
Prevent the tape guide from peeling from the flat surface.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device, and more particularly, to an improvement in a structure for attaching a tape guide to a rotary base to which a magnetic head is fixed.

[0002]

[Prior Art]

 Conventionally, a rotary magnetic head device has been widely used for an auto-reverse type tape recorder. In this rotary magnetic head device, a rotary pedestal equipped with a magnetic head is rotated 180 ° so that a magnetic gap formed on the front surface of the magnetic head can be used as a forward play track and a reverse play track of a magnetic tape. It can be done.

In this type of rotary magnetic head device, a stopper is used for accurately positioning the rotary base in the tape running direction at each position where the rotary base is rotated by 180 °. Further, generally, a tape guide for accurately guiding the tape to the magnetic gap is attached to one side surface of the magnetic head. In such a rotary magnetic head device, since the machining accuracy of the magnetic head and the tape guide itself may vary, precise position adjustment is necessary when mounting the tape guide. However, since the magnetic head mounted on the rotary pedestal is generally small, the workability of position adjustment and fixing is poor, which causes cost increase and quality deterioration due to the tape guide position displacement.

On the other hand, Japanese Utility Model Publication No. 2-1713 discloses a rotary magnetic head device in which a hole is formed on the front surface of a rotary pedestal (rotary drum), that is, a magnetic head mounting surface, and a tape guide is implanted in this hole. Is disclosed. In this rotary magnetic head device, since the tape guide is planted on a rotary pedestal larger than the magnetic head, the workability of mounting the tape guide can be improved as compared with the case where the tape guide is directly mounted on the magnetic head.

[0005]

[Problems to be solved by the device]

 In the case of the structure in which the tape guide is implanted in the hole provided on the rotary base, the magnetic head may be displaced when the magnetic head is mounted on the rotary base. It is necessary to adjust the mounting position of the tape guide according to the mounting position of the head. However, in the case of a structure in which the tape guide is press-fitted into the hole provided in the rotary pedestal and implanted, it becomes impossible to adjust the position of the tape guide, and the tape guide cannot be correctly aligned with the magnetic head.

On the other hand, if the tape guide is loosely fitted in the hole formed in the rotary pedestal and fixed by an adhesive, the position of the tape guide can be adjusted. In this case, the tape guide is fixed by the adhesive. Until then, the tape guide can move freely in the hole, making position adjustment work of the tape guide difficult. Also, when fixing the tape guide to the rotation base with adhesive, it is difficult to inject a sufficient amount of adhesive into the hole after inserting the tape guide into the hole, and sufficient fixing strength can be obtained. Disappear. If the method of inserting the tape guide into the hole after injecting the adhesive into the hole makes it impossible to use the quick-drying adhesive, the work efficiency of fixing the tape guide decreases, and the tape guide is inserted into the hole. At that time, the adhesive may stick out of the hole and stain the surface of the magnetic head.

Therefore, an object of the present invention is to easily attach and adjust the position of the tape guide for accurately guiding the magnetic tape to the magnetic gap of the magnetic head, and to prevent the fixing failure of the tape guide. It is to provide a structure of a rotary magnetic head device that is unlikely to occur.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention rotates a rotary pedestal to which a magnetic head is fixed to rotate 180 ° so that the magnetic gap formed in the magnetic head becomes a normal play track and a reverse play track of the magnetic tape. In the rotary magnetic head device adapted to correspond to the above, a flat surface portion is formed on a side surface of the rotary pedestal, a projection portion is provided on the flat surface portion, and a tape guide for guiding the magnetic tape in the traveling direction is attached to the projection portion. Also provided is a rotary magnetic head device characterized in that it is fixed on the flat surface portion.

In the rotary magnetic head device having the above structure, preferably, a claw portion that cooperates with the above-mentioned flat surface portion and sandwiches the tape guide is formed integrally with or separately from the protruding portion on the rotary base. It

More preferably, a guide groove for guiding the magnetic tape in the traveling direction is formed in the tape guide, a protrusion piece loosely fitted in the guide groove is formed in the rotary base, and the claw portion is provided. It is formed integrally with the tip of the protruding piece.

[0011]

[Action]

 In the rotary magnetic head device configured as described above, since the flat surface formed on the side surface of the rotary pedestal is used as the mounting surface of the tape guide, it is possible to secure a large mounting area compared to when mounting on the small side surface of the magnetic head. it can. Therefore, the work of attaching the tape guide can be facilitated, and the reliability of the attachment strength of the tape guide can be improved. Further, since the position of the tape guide can be adjusted on the flat surface of the rotary pedestal in a state of being engaged with the projection provided on the flat surface of the rotary pedestal, the work of adjusting the position of the tape guide becomes easy. Moreover, since the tape guide can be securely and quickly fixed to the flat surface portion of the rotating pedestal with a proper amount of adhesive or the like after the position adjustment, the workability of attaching the tape guide is improved.

Further, when the claw portion for sandwiching the tape guide in cooperation with the flat surface portion of the side surface of the rotary pedestal is formed integrally with or separately from the projecting portion, the tape is kept until the tape guide is fixed to the flat surface portion. The guide can be temporarily held on the flat surface portion, and after being fixed, peeling of the tape guide from the flat surface portion due to external force can be reliably prevented by the claw portion.

In particular, a guide groove for guiding the magnetic tape in the traveling direction is formed in the tape guide, a protruding piece that is loosely fitted in the guide groove is provided on the rotary base, and a claw portion is integrally formed at the tip of the protruding piece. When formed, the claw portion can more reliably prevent the tape guide from peeling from the flat surface portion due to an external force. That is, since the tape guide that guides the magnetic tape partially projects from the flat surface of the side surface of the rotary pedestal to the magnetic tape side, peeling of the tape guide from the flat surface easily occurs from the guide groove side, but it does not play in the guide groove. Since the claw portion that sandwiches the tape guide in cooperation with the flat portion is formed at the tip of the protruding piece to be fitted, peeling of the tape guide can be reliably prevented.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 5 show a first embodiment of the present invention. Referring to these figures, particularly FIG. 1, a rotary magnetic head device used in an auto-reverse type stereo tape recorder is equipped with a magnetic head 11 for recording and reproducing and a magnetic head 12 for erasing. The magnetic heads 11 and 12 each have a curved top surface with which the magnetic tape 10 is brought into sliding contact. Only two magnetic gaps 11a for two channels are formed on the top surface of the recording / reproducing magnetic head 11, and one magnetic gap 12a is formed on the top surface of the erasing magnetic head 12. The rotary magnetic head device further includes a drum-shaped rotary base 13 for supporting the magnetic heads 11 and 12, and a magnetic tape 10 provided on one side of the magnetic heads 11 and 12 in the running direction of the magnetic tape 10. And a tape guide 14 for accurately guiding the normal play track and the reverse play track to the magnetic gaps 11a and 12a of the magnetic heads 11 and 12, respectively.

A storage portion 13a (see FIG. 3) is formed on the front surface of the rotary pedestal 13 arranged so as to face the magnetic tape 10, and the magnetic heads 11 and 12 have top faces on the end faces. Each bottom side is inserted into the storage portion 13a so as to project from it and the position thereof is adjusted, and then the rear side of the rotary pedestal 13 is fixed to the rotary pedestal 13 with an adhesive.

The rotating base 13 is used by being attached to a rotating mechanism (not shown) provided on the head base. Assuming that the magnetic heads 11 and 12 are in the state of FIG. 2 (a) at the time of forward play and the magnetic gaps 11a and 12a are in sliding contact with the forward play track of the magnetic tape 10, the rotation base 13 at the time of backward play. The magnetic heads 11 and 12 move away from the magnetic tape 10 together with the rotating mechanism, and the rotating pedestal 13 is rotated 180 ° by the rotating mechanism at the retracted position so that the magnetic gaps 11a and 12a are in the reverse play tracks of the magnetic tape. The rotary base 13 is advanced together with the rotary mechanism so that the magnetic gaps 11a and 12a come into contact with the reverse play track of the magnetic tape 10 in this state. As described above, since the rotary base 13 is rotated by 180 °, the head base is provided with a stopper (not shown) for accurately holding the rotary base 13 in the traveling direction of the magnetic tape 10.

As shown in FIG. 4, the tape guide 14 has a pair of guide protrusions 14 a formed by notching the top of the tape guide 14 so as to face each other, and the magnetic tape 10 has both guide protrusions 14 a. It is adapted to be guided in the traveling direction in the space, that is, in the guide groove 14d. A flat surface portion 13b for mounting the tape guide 14 is formed on the side surface of the rotary base 13, and a projection portion 15 that can be engaged with the tape guide 14 is provided on the flat surface portion 13b in a protruding manner. On the other hand, the tape guide 14 is formed with an elongated groove-like engaging groove 14b that engages with the protruding portion 15.

The rotary pedestal 13 can be formed by, for example, an aluminum die casting method, a resin molding method, or the like. The protrusion 15 can be formed integrally with the rotary pedestal 13, but may be embedded in the flat surface portion 13 b of the rotary pedestal 13. On the other hand, the tape guide 14 can be formed, for example, by punching and pressing a metal plate.

When assembling the rotary magnetic head device having the above structure, first, the magnetic heads 11 and 12 are attached to the rotary pedestal 13, and then the tape guide 14 is attached to the rotary pedestal 13. At this time, since the flat surface portion 13b formed on the side surface of the rotary pedestal 13 is used as the mounting surface of the tape guide 14, a large mounting area can be secured as compared with the case of mounting on the small side surface of the magnetic head. Therefore, the work of attaching and adjusting the position of the tape guide 14 is facilitated. Further, since the tape guide 14 can be adjusted in position in the direction shown by an arrow in FIG. 5, for example, on the flat surface portion 13b in a state of being engaged with the protrusion 15 provided on the flat surface portion 13b of the rotary pedestal 13, the tape guide 14 can be adjusted. The position adjustment work of the door 14 is further improved. Moreover, the tape guide 14 is adjusted by pouring an appropriate amount of adhesive or the like (not shown) after the position adjustment into the slotted engagement groove 14b of the tape guide 14 or between the flat surface portion 13b and the tape guide 14. Since it can be securely and quickly fixed to the flat surface portion 13b of the rotary pedestal 13, the workability of attaching the tape guide 14 is further improved. In this embodiment, as shown in FIG. 5, since the recess 14c is formed in the center of the engaging groove 14b, an appropriate amount of space is provided between the protrusion 15 and the slot-like engaging groove 14b of the tape guide 14. The adhesive can be secured. Therefore, the adhesive strength of the tape guide 14 can be increased.

FIG. 6 shows a second embodiment of the present invention, FIGS. 7 and 8 show a third embodiment of the present invention, and FIGS. 9 and 10 show a fourth embodiment of the present invention. 11 to 13 show the fifth embodiment of the present invention, and FIGS. 14 and 15 show the fifth and sixth embodiments of the present invention, respectively. In these figures, the same components as those in the first embodiment are designated by the same reference numerals.

In the second embodiment shown in FIG. 6, the engaging groove 14b of the tape guide 14 is opened at the lower end in the figure on the side opposite to the guide protrusion 14a, and is provided at the tip of the protruding portion 15 of the rotary pedestal 13. The claw portion 16 that cooperates with the flat surface portion 13b of the rotary pedestal 13 to sandwich the tape guide 14 is formed integrally with the protruding portion 15. The tape guide 14 is engaged with the protruding portion 15 and adjusted in position on the flat surface portion 13b, and then fixed to the flat surface portion 13b with an adhesive or beam welding. In the case of this embodiment, since the tape guide 14 is sandwiched between the flat surface portion 13b of the rotary base 13 and the claw portion 16, the tape guide 14 is less likely to be peeled from the flat surface portion 13b.

In the third embodiment shown in FIGS. 7 and 8, a plurality of engaging grooves 14b and protrusions 15 similar to those in the second embodiment are provided in parallel with each other. The claw portion 16 similar to that of the second embodiment is integrally provided.

In the fourth embodiment shown in FIGS. 9 and 10, the lower portions of the guide protrusions 14 a and 14 a of the tape guide 14 are the supporting surfaces of the two protrusions 15 and 15 provided on the flat surface portion 13 b of the rotary base 13. 15a and 15a are in contact with each other. A gap is formed between the tape guide 14 and the inner side surfaces 15b, 15b of the two protrusions 15, 15. Further, a projecting piece 17 facing the bottom end surface 14c of the tape guide 14 is provided on the flat surface portion 13b of the rotary pedestal 13, and the tip end of the projecting piece 17 cooperates with the flat surface portion 13b to form the tape guide 14. A claw portion 16 sandwiching the bottom end portion is formed integrally with the protruding piece 17. The distance between the claw portion 16 and the flat surface portion 13b is slightly larger than the plate thickness of the tape guide 14, and when the tape guide 14 is supported by the supporting surfaces 15a and 15a of the protruding portions 15 and 15, the protrusion piece 17 and A gap is secured between the bottom end surface 14c of the tape guide 14. Therefore, the protruding piece 17 and the claw portion 16 do not interfere with the position adjustment of the tape guide 14 engaged with the protruding portions 15 and 15. The tape guide 14 is engaged with the protrusions 15 and 15 and adjusted in position on the flat surface portion 13b of the rotary pedestal 13, and then fixed to the flat surface portion 13b by an adhesive or beam welding. Also in this fourth embodiment, as in the second and third embodiments, the tape guide 14 is sandwiched between the flat surface portion 13b of the rotary base 13 and the claw portion 16 so that the tape guide 14 is flat. It becomes difficult to peel from the portion 13b.

In the fifth embodiment shown in FIGS. 11 to 13, the lower portions of the guide protrusions 14 a and 14 a of the tape guide 14 are the support surfaces 15 a of the two protrusions 15 and 15 provided on the flat surface portion 13 b of the rotary pedestal 13. , 15a, respectively. Further, a gap is formed between the inner side surfaces 15b, 15b of the two protrusions 15, 15 and the tape guide 14. Further, the rotary pedestal 13 is integrally provided with a projecting piece 18 which can be loosely fitted in a guide groove 14d formed between the guide projections 14a of the tape guide 14, and the tip of the projecting piece 18 is flat. A claw portion 16 that cooperates with the portion 13b to sandwich the inner peripheral edge of the guide groove 14d of the tape guide 14 is formed integrally with the protruding piece 18. The distance between the claw portion 16 and the flat surface portion 13b is slightly larger than the plate thickness of the tape guide 14, and when the tape guide 14 is supported by the supporting surfaces 15a, 15a of the protruding portions 15, 15, the protruding piece 18 is formed. A gap is secured between the inner bottom portion of the guide groove 14d of the tape guide 14. Therefore, the claw portion 16 does not interfere with the position adjustment of the tape guide 14 engaged with the protruding portions 15 and 15. The tape guide 14 is adjusted in position on the flat surface portion 13b of the rotary pedestal 13 while being engaged with the protruding portions 15 and 15, and then fixed to the flat surface portion 13b by an adhesive or beam welding.

Also in the fifth embodiment, as in the second, third and fourth embodiments, the tape guide 14 is sandwiched between the flat surface portion 13b of the rotary pedestal 13 and the claw portion 16 so that the tape It is difficult for the guide 14 to peel off from the flat surface portion 13b.

When the tape guide 14 is fixed to the rotary pedestal 13 using an adhesive after adjusting the position of the tape guide 14, as shown in FIG. 13, the adhesive 19 is provided only between the tape guide 14 and the flat surface portion 13b. Although it may be applied to the tape guide 14, the gap between the inner bottom of the guide groove 14d of the tape guide 14 and the projecting piece 18, or the space between the tape guide 14 and the claw portion 16 is filled, so that The effect of preventing peeling can be enhanced.

In the case of the above-described second to fifth embodiments, the claw portion 16 itself also serves as a guide means when adjusting the position of the tape guide 14, and also has a function of temporarily holding the tape guide 14 with respect to the rotary base 13. Have. Therefore, for example, when the tape guide 14 is continuously supplied to the rotary pedestal 13 on the line and the positioning and fixing process is continuously performed, the tape guide 16 can prevent the tape guide 14 from falling off. Adjustment and installation work become easy.

In the sixth embodiment shown in FIG. 14, between the claw portion 16 and the tape guide 14 which are integrally provided at the tip of the protruding piece 18 similar to the fifth embodiment, it is made of, for example, resin or metal. The spacer 20 is press-fitted. Therefore, the tape guide 14 after the position adjustment is more firmly fixed to the rotary base 13.

In the seventh embodiment shown in FIG. 15, a groove 21 for pouring a resin, an adhesive agent or the like into the inner side surface of the claw portion 16 integrally provided at the tip of the protruding piece 18 similar to the fifth embodiment. Are formed. Therefore, in this embodiment, it is easy to set the application position of the adhesive, resin or the like for adhering the claw portion 16 and the tape guide 14 at a fixed position, and the workability of fixing the tape guide 14 is improved.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment described above, and various modifications can be made to the constituent elements. For example, in the above-described embodiment, the magnetic head 11 for recording / reproducing and the magnetic head 12 for erasing are provided on the common rotary pedestal 13, but each magnetic head may be individually provided on the rotary pedestal. Further, in the above embodiment, the tape guide 14 is provided only on one side of the magnetic head in the running direction of the magnetic tape, but a pair of flat portions are formed on the side surface of the rotary base 13 in parallel with each other. You may attach a tape guide to each part. In this case, it is preferable to form one guide protrusion on each tape guide and arrange them on a diagonal line with respect to the top surface of the magnetic head. Further, in the above-described embodiment, the guide protrusion 14a of the tape guide 14 has parallel tape guide surfaces facing each other with the magnetic tape 10 sandwiched between them, but the tape guide portion spreads toward the tip of the protrusion. The tape guide surface may be an inclined surface. Further, the shape and arrangement of the protruding portion 15, the claw portion 16, the protruding pieces 17, 18 and the like can be further modified.

[0032]

As is apparent from the above description, according to the present invention, a flat surface portion is formed on a side surface of a rotary pedestal, and a tape guide is engaged with a protrusion provided on the flat surface portion so as to adjust the position. Since it is configured to be fixed on the flat surface portion, it is possible to easily attach and adjust the position of the tape guide, and it is possible to provide the rotary magnetic head device in which the fixing failure of the tape guide hardly occurs.

[Brief description of drawings]

FIG. 1 is a perspective view of a rotary magnetic head device according to a first embodiment of the present invention.

FIG. 2A is a front view of the head device shown in FIG. 1, and FIG.
Is a side view thereof.

3A is a front view of a rotary base used in the head device shown in FIG. 1, and FIG. 3B is a side view thereof.

4 is a side view of a tape guide used in the head device shown in FIG.

5 is an enlarged view of an essential part showing an engagement state between an engagement groove of the tape guide shown in FIG. 1 and a protrusion of a rotary pedestal.

6A and 6B show a second embodiment of the present invention, in which FIG. 6A is a front view of a rotary magnetic head device, and FIG.

FIG. 7 is a perspective view of a rotary magnetic head device according to a third embodiment of the present invention.

8A is a front view of the head device shown in FIG. 7, and FIG. 8B is a side view of a main part thereof.

FIG. 9 is a perspective view of a rotary magnetic head device showing a fourth embodiment of the present invention.

10 is a side view of the rotary magnetic head device shown in FIG. 9. FIG.

FIG. 11 is a perspective view of a rotary magnetic head device according to a fifth embodiment of the present invention.

12 (a) is a front view of the head device shown in FIG.
(b) is a side view.

13 is a longitudinal sectional view of a main part of the rotary magnetic head device shown in FIG.

FIG. 14 is a vertical cross-sectional view of a main part of a rotary magnetic head device showing a sixth embodiment of the present invention.

FIG. 15 is a perspective view of a main part of a rotary magnetic head device according to a seventh embodiment of the present invention.

[Explanation of symbols]

 11 magnetic head for recording / reproducing 11a magnetic gap 12 magnetic head for erasing 12a magnetic gap 13 rotating pedestal 13b flat surface portion 14 tape guide 14a guide protrusion 14b engaging groove 14c bottom end face 14d guide groove 15 protruding portion 16 claw portion 17 protruding piece 18 protruding Piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomoaki Oomomo, Tomoaki Oomomo No.7, Yukiya Otsuka-cho, Ota-ku, Tokyo, Alps Electric Co., Ltd. (72) Michiharu Motonishi No. 1 Yukiya-Otsuka-cho, Ota-ku, Tokyo No. 7 in Alps Electric Co., Ltd. (72) Inventor Tokushi Tokichi No. 7 Yukiya Otsuka-cho, Ota-ku, Tokyo No. 7 in Alps Electric Co., Ltd. (72) Inventor Hisashi Tanaka Yukiya Otsuka-cho, Ota-ku, Tokyo 1-7, Alps Electric Co., Ltd. (72) Creator Kazuyoshi Kikuchi 1-7, Yukiya Otsuka-cho, Ota-ku, Tokyo, Alps Electric Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A rotary pedestal to which a magnetic head is fixed is fixed to 180.
In a rotary magnetic head device in which a magnetic gap formed in a magnetic head is made to correspond to a forward play track and a reverse play track of a magnetic tape by rotating the magnetic head, a flat portion is formed on a side surface of the rotary pedestal. The rotary magnetic head device is characterized in that a protrusion is provided on the flat portion, and a tape guide for guiding the magnetic tape in the traveling direction is engaged with the protrusion and fixed on the flat portion. 2. The rotating base is provided with a claw portion that cooperates with the flat surface portion and sandwiches the tape guide, integrally with or separately from the protruding portion. Rotary magnetic head device. 3. The tape guide is formed with a guide groove for guiding the magnetic tape in the running direction, the rotary base is formed with a protruding piece that is loosely fitted in the guide groove, and the claw portion is formed of the protruding piece. The rotary magnetic head device according to claim 2, wherein the rotary magnetic head device is integrally formed at the tip.