JP3054020U - Shaft fixing device in electronic equipment - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the number of parts and reduce the production cost. SOLUTION: This is a shaft fixing device in which each movable guide post 5a in a magnetic tape device is fixed to each moving table 4a, 4b, and a support shaft 21 of each movable guide post 5a.
A male screw part 22 is provided at the center of the moving table 4a, 4
b, a small-diameter hole 23 for inserting the base end portion 21a of the support shaft 21 and a large-diameter hole 24 for fitting the male screw portion 22 are formed on the inner peripheral surface of the large-diameter hole 24. A plurality of protrusions 32 are provided at predetermined intervals in the direction,
Is inserted into the large-diameter hole 24 while rotating the male screw part 22, and the male screw part 22 is formed while forming the screw groove 33 in each ridge 32 by the male screw part 22. 22 was screwed into the large-diameter hole 24.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a shaft fixing device in an electronic device in which a support shaft of a movable guide post for winding a magnetic tape in a magnetic tape device is fixed to a moving table, for example.

[0002]

[Prior art]

 An example of a magnetic tape device will be described with reference to FIG. 6. A pair of left and right long holes 3a and 3b are formed in a chassis 1 with a head cylinder 2 interposed therebetween, and a longitudinal direction a is formed along each of the long holes 3a and 3b. , B movable guide posts 5a, 5b are erected on a pair of movable tables 4a, 4b. Reference numeral 6 denotes a full-width erasing head, 7 denotes an audio erasing head, 8 denotes an audio / control head, 9 denotes a fixed tape guide post, 10 denotes a capstan, and 11 denotes a pinch roll which presses against a capstan 10 via a magnetic tape t. Reference numeral 12 denotes a tension post (see the phantom line in FIG. 6) for applying tension to the magnetic tape t during loading, and 13 denotes a rotary cam for switching a mode switching lever (not shown) and the like. A worm gear 15 meshes with a gear portion 14 formed on the outer peripheral surface of the worm gear 15, and the worm gear 15 is connected to a cam motor 17 via a pulley mechanism 16. Reference numeral 18 denotes a positioning pin protruding from the chassis 1 so as to face the front end of each of the slots 3a and 3b, and engages an engaging frame 19 protruding from the front of each of the movable bases 4a and 4b. Thus (see the phantom line in FIG. 6), each of the moving tables 4a and 4b is positioned at the loading position.

[0003] Conventionally, there is a shaft fixing device for fixing each of the movable guide posts 5a to each of the moving tables 4a and 4b, which is described in Japanese Utility Model Laid-Open Publication No. Sho 61-105936. As shown in FIG. 8, each movable guide post 5a has a support shaft (shaft) 21 and a male screw portion 22 fitted to the center of the support shaft 21. Female member) 4a, 4b are formed with a small-diameter hole 23 for inserting the base end 21a of the support shaft 21 and a large-diameter hole 24 for fitting the male screw portion 22 therein. A female screw portion 24a for screwing the male screw portion 22 is formed on the peripheral surface, and a stopper screw 26 is screwed into a screw hole 25 that penetrates each of the moving tables 4a and 4b and reaches the small-diameter hole 23. .

A guide roller 27 is rotatably fitted to the tip 21 b of the support shaft 21. The guide roller 27 is sandwiched between a pair of upper and lower collars 28 fitted to the support shaft 21 so as not to move up and down. . Reference numeral 29 denotes a link mechanism connected to the connection shaft 30 of each of the moving tables 4a and 4b, which is linked to the rotating cam 13 (see FIG. 6) to rotate the rotating cam 13 in the direction of arrow e. As a result, the movable tables 4a and 4b are advanced a through the link mechanism 29, and the movable cams 4a and 4b are retracted through the link mechanism 29 by rotating the rotary cam 13 in the direction opposite to the arrow e. b.

In the above configuration, when the movable guide posts 5a are fixed to the movable bases 4a and 4b, the base end 21a of the support shaft 21 is inserted into the small-diameter hole 23 and the operation groove of the upper collar 28 is formed. After rotating the support shaft 21 with a tool such as a screwdriver engaged with the screw 31 and screwing the male screw portion 22 into the female screw portion 24a, a stopper screw 26 is screwed into the screw hole 25 and the tip of the stopper screw 26 is removed. The support shaft 21 is pressed against the base end 21a.

[0006]

[Problems to be solved by the invention]

 In the above conventional configuration, a female screw portion 24a is formed in advance on the inner peripheral surface of the large-diameter hole 24, and the male screw portion 22 is screwed into the female screw portion 24a, and a backlash generated between the two screw portions 22, 24a is formed. Therefore, there is a possibility that the screwing of the male screw portion 22 may be loosened due to vibrations when moving the movable bases 4a and 4b. In this case, the number of components is increased, and the threading of the female screw portion 24a and the screw hole 25 is troublesome, resulting in high manufacturing costs.

The present invention has been made in view of the above-described conventional drawbacks, and has as its object to provide a magnetic tape device that has a small number of parts and can be manufactured at low cost.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is a shaft fixing device for an electronic device in which a shaft is fixed to a shaft fixing member, wherein the shaft has an external thread portion, A small-diameter hole for inserting the end of the shaft body and a large-diameter hole for fitting the male screw portion are formed in the shaft stopper, and the male screw is formed on the inner peripheral surface of the large-diameter hole. An engaged portion engageable with the portion is partially formed, and an end of the shaft body is inserted into the small-diameter hole, and the male screw portion is rotated and fitted into the large-diameter hole, The male screw portion is screwed into the large diameter hole while forming a screw groove in the engaged portion by the male screw portion.

According to the above configuration, the male screw portion provided on the shaft body is fitted into the large diameter hole of the shaft fixing member while rotating, and the male screw portion partially forms the inner peripheral surface of the large diameter hole. A thread groove is formed in the engaging portion, so-called self-tapping is performed. The male thread portion and the thread groove are securely adhered to each other. Therefore, even if the shaft fixing member is vibrated, the male screw is vibrated by the vibration. There is no danger that the screwing of the part will be loosened, and the stopper screw for anti-loosening, which was required in the past, becomes unnecessary, and the number of parts can be reduced by the amount that is no longer necessary, and screw hole processing is unnecessary. Therefore, the production cost can be significantly reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the engaged portion includes a plurality of protrusions projecting from the inner peripheral surface of the large-diameter hole at predetermined intervals in a circumferential direction. It is characterized by being composed of articles.

[0011] According to the above configuration, a plurality of protrusions can be formed simultaneously on the inner peripheral surface of the large-diameter hole at the time of forming the shaft fixing member, and the forming work is not required.

According to a third aspect of the present invention, in the first aspect, the inner peripheral surface of the large-diameter hole is formed in a polygonal shape, and a flat portion of the polygonal inner peripheral surface is formed by the engaged portion. It is characterized by having.

[0013] According to the above configuration, the inner peripheral surface of the large-diameter hole can be formed into a polygonal shape to form a flat portion when the shaft stopper is formed. It does not take time.

According to a fourth aspect of the present invention, in the device according to any one of the first to third aspects, the shaft stopper is formed on a chassis of the magnetic tape device by forming a pair of left and right sides with a head cylinder interposed therebetween. The moving table is movable along the long hole, and the shaft is a support shaft of a movable guide post projecting from each of the moving tables to wind a magnetic tape around a head cylinder. .

According to the above configuration, the movable base with the movable guide post of the magnetic tape device can be manufactured at low cost.

[0016]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 4 show a shaft fixing device for fixing each movable guide post 5a of the magnetic tape device according to an embodiment of the present invention to each of the moving tables 4a and 4b. A plurality (three in this embodiment) of substantially triangular (or semi-circular, etc.) cross-sectional ridges (eg, semi-circular) are provided on the inner peripheral surface of the large-diameter holes 24 of 4a and 4b at predetermined intervals in the circumferential direction. ) 32 are protruded along the axial direction. In the configuration other than those described above, the same reference numerals are given to substantially the same portions as those in the conventional example shown in FIGS. 7 and 8, and description thereof will be omitted.

In the above configuration, when each movable guide post 5a is fixed to each of the movable bases 4a and 4b, the base end 21a of the support shaft 21 is inserted into the small-diameter hole 23 and the operation groove of the upper collar 28 is formed. The male shaft 22 may be inserted into the large-diameter hole 24 by rotating the support shaft 21 with a tool such as a screwdriver engaged with the base 31. As a result, a thread groove 33 is formed in each of the ridges 32 by the male screw portion 22, and so-called self-happing is performed by the male screw portion 22, so that the support shaft 21 can be securely fixed to each of the moving tables 4a and 4b. .

In this case, the male screw portion 22 is fitted into the large-diameter hole 24 while rotating, and the male screw portion 22 forms a thread groove 33 on each of the ridges 32 formed on the inner peripheral surface of the large-diameter hole 24. The so-called self-tapping is performed, and the male screw portion 22 and the screw groove 33 are securely in close contact with each other. Therefore, the stopper screw 26 (see FIG. 7) for preventing the loosening, which was required in the past, becomes unnecessary, and the number of components can be reduced by the amount of the need, and the female screw portion 24a and the screw hole 25 (see FIG. (Refer to (1)), and the manufacturing cost can be significantly reduced. Furthermore, when molding each of the movable tables 4a and 4b from a synthetic resin material, a plurality of ridges 32 can be simultaneously molded on the inner peripheral surface of the large-diameter hole 24, and the molding time is not required.

FIG. 5 shows another embodiment of the present invention, in which the inner peripheral surface of the large-diameter hole 24 is formed in a quadrangular shape (or a polygonal shape such as a hexagon or octagon). The male screw portion 22 is engaged with a flat portion (engaged portion) 34 of the square inner peripheral surface. The other configuration is almost the same as that of the embodiment shown in FIGS. 1 to 4, and the description thereof will be omitted.

In the above configuration, similarly to the embodiment shown in FIGS. 1 to 4, the base end 21 a of the support shaft 21 is inserted into the small-diameter hole 23, and is engaged with the operation groove 31 of the upper collar 28. The male screw portion 22 may be fitted into the large-diameter hole 24 by rotating the support shaft 21 with a tool such as a screwdriver. Thus, the screw groove 33 is formed in each flat portion 34 by the male screw portion 22, and the so-called self-tapping is performed by the male screw portion 22, so that the support shaft 21 can be securely fixed to each of the movable tables 4 a and 4 b.

According to the above configuration, when molding each of the movable bases 4a and 4b with a synthetic resin material, the flat portion 34 can be simultaneously molded on the inner peripheral surface of the large-diameter hole 24, and the molding time is reduced. No.

In the above-described embodiments, a description has been given of an example of a shaft fixing device for fixing each movable guide post 5a to each of the movable bases 4a and 4b. However, the present invention is not limited to this. The present invention is also applicable to a case where a shaft of an electronic device is fixed to a shaft stopper.

[0023]

[Effect of the invention]

 According to the first aspect of the present invention, the male screw portion provided on the shaft body is fitted into the large diameter hole of the shaft fixing member while rotating, and the male screw portion is partially formed on the inner peripheral surface of the large diameter hole. A thread groove is formed in the engaged portion, and so-called self-tapping is performed. Since the external thread portion and the thread groove are securely adhered to each other, even if the shaft fixing member is vibrated, the vibration is caused by the vibration. There is no danger of loosening of the external thread, and the stopper screw for anti-loosening, which was required in the past, is no longer necessary, and the number of parts can be reduced by the unnecessary amount, and thread hole processing is unnecessary. Therefore, the production cost can be significantly reduced.

According to the second aspect of the present invention, a plurality of ridges can be simultaneously formed on the inner peripheral surface of the large-diameter hole at the time of forming the shaft fixing member, and the forming time is not required.

According to the invention of claim 3, similarly to the invention of claim 2, when forming the shaft stopper, the inner peripheral surface of the large-diameter hole is formed into a polygonal shape to form a flat portion. And can be molded without the hassle of molding.

According to the present invention, the movable base with the movable guide post of the magnetic tape device can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a shaft fixing device for fixing each movable guide post of a magnetic tape device according to an embodiment of the present invention to each moving table.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a horizontal sectional view of the main part.

FIG. 5 is a longitudinal sectional view showing a main part of another embodiment of the present invention.

FIG. 6 is a schematic plan view of a magnetic tape device.

FIG. 7 is a longitudinal sectional view showing a conventional shaft stopper.

8 is a view taken in the direction of arrows BB in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 chassis 2 head cylinder 3a long hole 3b long hole 4a movable base 4b movable base 5a movable guide post 21 support shaft (shaft body) 21a base end of support shaft 22 male screw part 23 small diameter hole 24 large diameter hole 32 Engaging part) 33 Screw groove 34 Flat part (engaged part) t Magnetic tape

Claims (4)

[Utility model registration claims] 1. A shaft fixing device for an electronic device in which a shaft is fixed to a shaft fixing member, wherein the shaft has an external thread portion, and the shaft fixing member has an end portion of the shaft. A small-diameter hole for inserting the male screw portion and a large-diameter hole for fitting the male screw portion are formed, and an engaged portion that can be engaged with the male screw portion is partially formed on an inner peripheral surface of the large-diameter hole. The end of the shaft body is inserted into the small-diameter hole, and is fitted into the large-diameter hole while rotating the male screw portion,
A shaft fixing device in an electronic device, wherein the male screw portion is screwed into the large-diameter hole while forming a screw groove in the engaged portion by the male screw portion. 2. The electronic device according to claim 1, wherein the engaged portion comprises a plurality of ridges projecting from the inner peripheral surface of the large-diameter hole at predetermined intervals in a circumferential direction. Axle fixing device in equipment. 3. The electronic apparatus according to claim 1, wherein an inner peripheral surface of the large-diameter hole is formed in a polygonal shape, and a flat portion of the polygonal inner peripheral surface is the engaged portion. Axle fixing device. 4. The mobile station according to claim 1, wherein the shaft stop member is a movable platform that can move along a pair of left and right long holes formed in a chassis of the magnetic tape device with a head cylinder interposed therebetween, and the shaft body is each movable platform 4. A shaft fixing device in an electronic device according to claim 1, wherein the shaft fixing device is a support shaft of a movable guide post for projecting the magnetic tape around a head cylinder.