JPH079276Y2 - Tape player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tape player provided with a capstan which is held by a capstan housing and runs a tape, and a guide post which guides the tape to the capstan.
In particular, by making the hole for supporting the guide post formed in the chassis smaller in area than the conventional one, it is possible to make the device compact and downsized, and to secure the parallelism of the guide post to the capstan. The present invention relates to a tape player that can make things easier.

[Conventional technology]

FIG. 3 is a plan view showing a tape running system of a rotary head type tape player used in a conventional DAT (digital audio tape recorder) or the like.

In the figure, reference numeral 1 is a chassis, reference numeral 2 is a supply side reel stand, reference numeral 3 is a winding side reel stand, and reference numeral 5 is a cassette pack. Reference numerals 6 and 7 indicate loading bases, and loading posts 6a, 6b and 7a, 7b are mounted on the loading bases 6 and 7, respectively. These loading bases 6 and 7 are guided by guide grooves 8 and 9 formed in the chassis and driven by a loading motor (not shown).

In FIG. 3, the loading bases 6 and 7 are located at the lower ends 8a and 9a of the guide grooves 8 and 9 when the tape is unloaded. When the loading of the cassette pack 5 is detected or the play button or the like is pressed in this state, the loading bases 6 and 7 are moved upward by the guide grooves 8 and 9. In this process, the magnetic tape T in the cassette pack 5 is pulled out by the loading posts 6a, 6b and 7a, 7b and wound around the rotary drum 4 (tape loading operation).

Furthermore, in the play mode, the magnetic tape T is a pinch roller.
While being pressed against the capstan 11 by 10, the capstan 11 is rotated to feed at a predetermined speed. At that time, the magnetic tape T is guided by the guide post 12 between the capstan 11 and the pinch roller 10. Information is recorded or reproduced by the rotary head provided on the rotary drum 4.

FIG. 4 shows the guide post 1 in the conventional DAT shown in FIG.
FIG. 3 is a sectional view showing an example of a mounting structure of 2. Reference numeral 15 in the drawing denotes a guide shaft, and the lower end of the guide shaft 15 is press-fitted and fixed in the central hole of the support member 16. The projection 16a on the lower surface of the support member 16 is inserted into the hole 1a formed in the chassis 1, and the lower end of the projection 16a is fixed to the lower surface of the chassis 1 by caulking. A spring 17 is provided on the upper surface of the support member 16 so as to be inserted into the guide shaft 15, and the spring 17 abuts the lower surface of the lower ring 18 to urge the lower ring 18 upward in the drawing. On the upper surface of the lower ring 18, a cylindrical body 20 in which the guide shaft 15 is loosely inserted, and a guide roller 21 in which the cylindrical body 20 is loosely inserted are placed.

On the other hand, a male screw 15a is formed on the upper portion of the guide shaft 15, and an upper ring 19 is screwed in from above. By adjusting the screwing degree of the upper ring 19, the cylindrical body 20
The heights of the lower ring 18 and the guide roller 21 can be adjusted with the spring 17 via.

Further, FIG. 5 is a cross-sectional view showing another example of the mounting structure of the guide post in the conventional DAT. In this conventional example, a capstan housing that holds the capstan 22
A support portion 25 that supports the guide post 29 is integrally provided on the side surface of the unit 23 in a direction parallel to the chassis 1. A hole is bored in the center of the support portion 25, the guide shaft 24 is inserted into the hole, and a spring 26 is provided on the outer periphery of the guide shaft 24.
Is placed. A cylindrical body 27, in which the guide shaft 24 is loosely inserted, is placed on the spring 26.
Are urged upward in the figure by the spring 26.

A male screw is formed on the upper end of the guide shaft 24, and an upper ring 28 is screwed into the male screw. The height of the cylindrical body 27 with which the magnetic tape T is contacted is adjusted by screwing the upper ring 28 against the biasing force of the spring 26. The capstan 22 is rotationally driven by a capstan motor M. When the capstan housing 23 is attached to the chassis 1, the capstan housing 23 and the supporting portion 25 are inserted into the hole 1b formed in the chassis 1 from below in the figure, and then the bottom of the capstan housing 23 is attached to the chassis 1b. It is abutted on the lower surface of and fixed with screws.

[Problems to be solved by the device]

However, in the conventional guide post mounting structure shown in FIG. 4, since the support member 16 is provided separately from the capstan housing, it is difficult to achieve parallelism between the guide shaft 15 and the capstan. In particular, in the crimping work, the tilt of the guide shaft 15 may be large. Further, in order to maintain the verticality of the guide shaft 15 with respect to the chassis with high precision by the caulking work, it is necessary to widen the stationary area of the support member 16 with respect to the chassis. As a result, the guide post mounted on the chassis 1
The distance between 12 and the guide groove 9 (t in FIG. 3) and the distance between the guide post 12 and the capstan 11 must be increased to some extent. Therefore, the guide groove 9, the guide post 12, and the capstan 11 cannot be provided in high density with each other, which is an obstacle to downsizing and downsizing of the device.

Further, in another conventional example shown in FIG. 5, the chassis 1
In addition, it was necessary to form the hole 1b having an area large enough to allow the capstan housing 23 and the supporting portion 25 to be inserted therethrough. Therefore, even when the guide post 29 shown in FIG. 5 is used, it is necessary to secure a margin width between the hole 1b of the chassis 1 and the guide groove to some extent. It was not possible to bring the loading base closer than a certain extent. Therefore, also in this case, it is difficult to make the device compact and compact.

The present invention is intended to solve the above problems, and the guide post insertion hole formed in the chassis has a smaller area than the conventional one, thereby making the device compact and downsized. An object of the present invention is to provide a tape player that enables the guide post to have a high degree of parallelism with respect to the capstan.

[Means for Solving the Problems]

A tape player according to the present invention comprises a capstan that runs a magnetic tape pressed against a pinch roller at a predetermined speed by rotation, a capstan housing that holds the capstan and is fixed to a chassis, and a capstan housing. It is installed parallel to the capstan at a position close to the stun,
In a tape player including a guide post for guiding a magnetic tape between a capstan and a pinch roller, the bottom of the capstan housing is located on the back side of the chassis, and the center axis of the guide post is the capstan housing. Is fixed to the bottom of the chassis, and the central axis projects upward from the chassis through a hole formed in the chassis.

[Action]

According to the above means, the guide post can be provided only by forming a hole having an area necessary for inserting the central axis of the guide post in the chassis. In this way, the holes for supporting the guide posts formed in the chassis can be made smaller in area than before, so that it is necessary to support other members such as the capstan and the loading base. It is possible to form the holes and grooves in the position close to the guide post of the chassis. Therefore, the guide post and other members such as the capstan and the loading base can be mounted close to each other on the chassis. Therefore, the device can be made compact and compact.

Further, in the above means, the central axis of the guide post is fixed to the capstan housing. Therefore, the central axis of the guide post, and hence the parallelism between the guide post and the capstan, can be maintained high.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a mounting structure of a guide shaft of a DAT according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof.

In these figures, the same parts as those in FIGS. 3 to 5 are designated by the same reference numerals.

The rotary head supporting tape player in this embodiment is
The basic structure is the same as that shown in FIG. That is, the magnetic tape T in the cassette pack 5 is pulled out by the loading bases 6 and 7 upper loading posts 6a, 6b, 7a and 7b guided by the guide grooves 8 and 9 and wound around the rotary drum 4. The wound magnetic tape T is guided between the capstan 11 and the pinch roller 10 by the guide post 12, and is further fed at a predetermined speed by the rotation of the capstan 11.

In FIGS. 1 and 2, reference numeral 30 is a capstan, reference numeral 31 is a capstan housing that holds the capstan 30, and reference numerals 32a and 32b are bearings that support the rotation of the capstan 30. The bottom 31a of the capstan housing 31 is provided with a press-fitting hole 35 into which the guide shaft 34 is press-fitted together with the three female screw holes 33.

On the other hand, reference numeral 36 indicates a chassis. This chassis 36
A circular insertion hole 36a through which the upper portion of the capstan housing 31 is inserted is formed in this. Further, a small notch 36b extending from the outer periphery of the insertion hole 36a on the guide groove 9 side toward the guide groove 9 is formed in the chassis 36.
It is continuously drilled with 6a. The notch 36b is for inserting the guide shaft 34. Further, the chassis 36 is provided with three small holes 36c around the insertion hole 36a.

Next, the work of attaching the capstan 30 and the guide post 38 (see FIG. 2) to the chassis 36 will be described.

In this operation, first, the guide shaft 34 is press-fitted into the press-fitting hole 35 and fixed to the capstan housing 31. Then, from the bottom of Fig. 1, the capstan housing
31 and the guide shaft 34 to the insertion hole 36 of the chassis 36.
The upper surface of the bottom portion 31a of the capstan housing 31 is brought into contact with the lower surface of the chassis 36 by being inserted into the a and the notch 36b. Then, the three male screws 37 are screwed into the female screw holes 33 through the small holes 36c to fix the capstan housing 31, the capstan 30, and the guide shaft 34 to the chassis 36. Further, after this fixing work, as shown in FIGS. 1 and 2, the spring 17 is placed on the chassis 36 so that the guide shaft 34 protruding from the chassis 36 is centered. Further, the lower ring 18, the cylindrical body 20 and the guide roller 21 are sequentially stacked on the spring 17. Finally, the upper ring 19 in which the female screw hole 19a is formed is screwed into the upper end of the guide shaft 34 in which the male screw 34a is formed, thereby forming the guide post 38 (see FIG. 2).
At this time, by adjusting the screwing degree of the upper ring 19, the height of the guide roller 21 that comes into contact with the magnetic tape T is increased between the downward pressing force of the upper ring 19 and the upward biasing force of the spring 17. The height can be adjusted.

As described above, according to this embodiment, the guide shaft 34 and the bottom portion 31a of the capstan housing 31 are fixed, and the capstan housing 31 is fixed to the chassis 36 on the guide shaft 34. Therefore, in order to attach the guide post 38 to the chassis, it is not necessary to form a hole having a large area in the chassis as in the conventional case, and a guide shaft having a small diameter is provided.
A hole with a small area that allows the 34 to pass through (notch shown in Fig. 1
36b) just need to be drilled. Therefore,
Width t of excess thickness between the notch 36b of the chassis 36 and the guide groove 9
Even if 1 (see Fig. 1) is secured to the same level as before,
The guide groove 9 (and thus the loading base) and the guide post 38 can be mounted closer to each other as much as the area of the hole for mounting the guide post can be made smaller than in the conventional case. Further, since the guide shaft 34 is fixed to the bottom portion 31a of the capstan housing 31, the guide post 38 and the capstan 30 can also be brought close to each other. Therefore, the guide post 38
Also, other members such as the loading base and the capstan 30 can be mounted on the chassis in high density with each other, and the device can be made compact and compact.

Further, since the guide shaft 34 is fixed to the capstan housing 31, it is easy to secure the parallelism of the guide shaft 34 (and thus the guide post 38) with respect to the capstan 30.

In addition, in the present embodiment, the notch 36b for inserting the guide shaft 34 is formed continuously with the insertion hole 36a for the capstan housing 31, but the hole for inserting the central shaft according to the present invention is formed in this. The holes are not limited to the above, and may be formed separately from the holes for inserting the capstan housing.

〔effect〕

As described above, according to the present invention, the lower end of the central axis of the guide post is fixed to the lower part of the chassis of the capstan housing, and the central axis is projected upward from the hole of the chassis. Therefore, the hole formed in the chassis for attaching the guide post need only have an area through which the central axis can be inserted, and thus the area of the hole can be made significantly smaller than in the conventional case. Therefore, even if the distance between the guide post and other members such as the capstan and the loading base is made smaller than the conventional one, it is possible to secure a sufficient surplus thickness in the chassis, so that the apparatus can be made compact and compact. Will be able to.

Further, since the central axis of the guide post is fixed to the capstan housing, it becomes easy to secure the parallelism of the guide post with respect to the capstan with high accuracy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a guide shaft mounting structure for a DAT according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a plan view showing a conventional DAT traveling system. FIG. 5 and FIG. 5 are sectional views showing a guide post mounting structure in a conventional DAT. 30 …… Capstan, 31 …… Capstan housing,
31a …… bottom of capstan housing, 34 …… guide shaft, 35 …… press-fit hole, 36 …… chassis, 36a …… insertion hole, 36b …… notch, 38 …… guide post.

Claims (1)

[Scope of utility model registration request] 1. A capstan that runs a magnetic tape pressed against a pinch roller at a predetermined speed by rotation, a capstan housing that holds the capstan and is fixed to a chassis, and a capstan close to the capstan. In a tape player provided in a parallel position with the capstan and having a guide post for guiding the magnetic tape between the capstan and the pinch roller, the bottom of the capstan housing is located on the rear surface side of the chassis. A tape player characterized in that a central axis of the guide post is fixed to the bottom portion of the capstan housing, and the central axis projects upward from a chassis through a hole formed in the chassis.