JP2551888Y2 - Grounding mechanism such as tape recorder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding mechanism suitable for use in a tape recorder or the like.

[0002]

2. Description of the Related Art Capstans such as tape recorders include:
A flywheel is fixed to the base. The capstan is received by a support fixed to the mechanical chassis. A metal bearing that is in contact with the capstan is disposed on the support. Then, the capstan is rotated by the rotation of the flywheel.
At this time, static electricity is charged on the capstan and the bearing, which are charged bodies.

[0003] The charged static electricity is discharged to a head wire for connecting the head and the amplifier. Therefore, at the time of discharging, noise (for example, “buzz”) is generated from the speaker via the amplifier.

In view of the above, various grounding mechanisms have been proposed for extracting static electricity generated in the capstan and the bearing to the ground.

FIG. 5 shows a grounding mechanism of a conventional tape recorder. Reference numeral 1 denotes a metal head chassis, and a head 2 is mounted on one end of the head chassis 1. The head chassis 1 is slidably disposed by driving means (not shown). Note that the head chassis 1 of the present example is formed in a substantially L-shape.

Reference numeral 3 denotes a capstan, which is arranged as a pair on both sides of the head chassis 1 at a fixed distance. A flywheel (not shown) is fixed to the base of the capstan 3. Further, the capstan 3 is provided with a metal bearing 4 on the tip side. The bearing 4
Are disposed on a mechanical chassis (not shown) via a plastic support (not shown). Therefore, static electricity is not led out from the support portion to the mechanical chassis.

[0007] Reference numerals 30 and 31 denote fixed posts, which are erected on the mechanical chassis. The fixed posts 30 and 31 are arranged in parallel on the front side of the head 1. The fixing post 30 has a tapered locking portion 30a formed at the tip thereof. A pair of protruding pieces 31a are formed symmetrically in the vicinity of the tip of the fixed post 31 in a direction orthogonal to the axis.

Reference numeral 32 denotes a metal conductive member, which has a plate shape. An escape portion 33 is cut out at a portion corresponding to the head 2 in the conductive member 32. The conductive member 32
, A contact piece 34 that contacts the bearing 4 of the capstan 3 is provided at both ends thereof.

As shown in FIG. 6, a hole 35 is formed in the conductive member 32 at a position corresponding to the locking portion 30a of the fixing post 30.
However, engagement holes 36 are respectively formed at portions corresponding to the fixing posts 31. The engagement hole 36 is formed in a long hole shape along the longitudinal direction of the conductive member 32, and an engagement portion 36 a corresponding to the protrusion 31 a of the fixed post 31 is formed on one end side.

In the conductive member 32, a groove 38 having a piece 37 is formed at a position adjacent to the engaging hole 36 at a position corresponding to the upper surface of the head chassis 1. This groove 38 is
Are formed along the direction orthogonal to the longitudinal direction of Then, as shown in FIG.
To restrict the vertical position between the head chassis 1 and the conductive member 32, and to prevent the rotation of the ball 39 from hindering the sliding of the head chassis 1.

That is, the ball 39 is mounted on the head chassis 1
And the lower surface of the cut-and-raised piece 37 of the conductive member 32 are in contact with each other. Further, the contact piece 34 of the conductive member 32 is in contact with the bearing 4 of the capstan 3 as shown in FIG.

When a play button (not shown) is pressed, the head chassis 1 slides. Simultaneously with this sliding, pinch rollers (not shown) arranged on both sides of the head chassis 1 are pressed against the rotating capstan 3. In addition, static electricity generated in the capstan 3 and the bearing 4, which are charged bodies, is guided through the conductive member 32 and the ball 39, through the head chassis 1, and to a mechanical chassis (not shown) which is at a ground potential. As a result, the static electricity between the capstan 3 and the bearing 4 is led to the ground, so that the static electricity is not taken into the head wire, and the generation of noise from the speaker can be prevented.

[0013]

[Problems to be solved by the invention] In the example of FIG.
In order to mount the conductive member 32, first, as shown in FIG. 6, the engagement portion 36 a of the engagement hole 36 of the conductive member 32 and the projection 31 a of the fixed post 31 are fitted together in a state where they correspond to each other. At the time of this fitting, for example, the ball 39 is engaged with the groove 38.

Next, the conductive member 32 is slid so that the fixing post 31 located at one end of the engagement hole 36 is located at the other end of the engagement hole 36 (the position shown in FIG. 5). Then, the engaging portion 30a of the fixing post 30 is inserted into the hole 35 of the conductive member 32 to lock the conductive member 32 to a mechanical chassis (not shown).

As described above, since the structure for attaching the conductive member 32 to the mechanical chassis is complicated, it takes time and effort to attach the conductive member 32 and the cost is increased.

Accordingly, the present invention aims at simplifying the mounting structure of a conductive member for guiding static electricity or the like to the ground.

[0017]

According to the present invention, an elastic conductive member is provided for electrically connecting a charged body disposed on a mechanical chassis to a slide chassis made of a conductive material moving on the mechanical chassis. In the grounding mechanism such as a tape recorder, a linear member having a helical engaging portion is used as the conductive member, and a first member for locking the helical engaging portion on the slide chassis. And a second locking portion for locking a linear portion other than the helix-shaped engaging portion on both sides of the first locking portion. The slide chassis is grounded via the first locking portion, and the conductive member is held by the slide chassis.

[0018]

When the grounding mechanism is applied to, for example, a tape recorder, for example, the capstan 3 and the bearing 4, which are charged bodies, are fixed on a mechanical chassis, and the head chassis 1 is configured to be slidable. Since the conductive member 8 fixed to the head chassis (slide chassis) 1 is configured to be elastic, the conductive member 8 is elastically deformed in a state in which it is in contact with the bearing 4 even when the head chassis 1 moves. Therefore, the conductive member 8 can be arranged on the head chassis 1 without any trouble.
In addition, static electricity in the capstan 3 and the bearing 4 can be grounded to the head chassis 1 via the conductive member 8. Since the mounting structure of the conductive member 8 can be a simple structure of the engaging portion 9 of the conductive member 8 and the locking portion 5 of the head chassis 1, the engaging portion 9 is engaged with the locking portion 5 and the conductive member 8 The conductive member 8 can be attached to the head chassis 1 only by engaging the linear member with the holding portions 6 and 7. Therefore, it can be easily mounted and manufactured at low cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, portions corresponding to those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a perspective view showing a main part of the embodiment.

In the figure, reference numeral 5 denotes a metal locking portion;
Reference numeral 7 denotes a holding portion, which is arranged on the front side of the head 2 on the head chassis 1 as a slide chassis. The plate-shaped locking portion 5 is erected so as to face the head 2 as shown in FIGS. The holding portions 6 and 7 are arranged on the left and right with the locking portion 5 sandwiched in the middle. As shown in FIG. 1, the holding portions 6 and 7 have a U-shape.

Reference numeral 8 denotes a linear conductive member made of an elastic material. As shown in FIGS. 1 and 2, the conductive member 8 has a hook-shaped engaging portion 9 formed in the middle thereof, that is, at a portion corresponding to the locking portion 5 of the head chassis 1. Then, the engaging member 9 is loosely fitted to the engaging portion 5 of the head chassis 1 to position the conductive member 8 with respect to the head chassis 1.

The conductive member 8 has its both ends (linear portions) always engaged with the holding portions 6 and 7 of the head chassis 1 (see FIGS. 2 and 3). Then, in a state before playing, as shown in FIG. 2, both end edges (linear end edges) of the conductive member 8 and the bearing 4 of the capstan 3 are separated.

In the play state, as shown in FIG. 3, both end edges of the conductive member 8 and the bearing 4 of the capstan 3 are pressed against each other. The conductive member 8 is elastically deformed even when the head chassis 1 slides and comes into pressure contact with the bearing 4, so that the sliding does not hinder.

As shown in FIG. 2, the pair of pinch rollers 10 are arranged with the head 2 on both sides of the head chassis 1 in the middle. This pinch roller 10 works with the head chassis 1. This example is configured as described above, and the rest is the same as the example of FIG. In this example, the fixing post as in the example of FIG. 5 is not provided upright on a mechanical chassis (not shown).

The conductive member 8 is attached to the head chassis 1 by, for example, fitting both ends of the conductive member 8 to the holding portions 6 and 7 with the engaging portion 9 loosely fitted to the locking portion 5.

When a play button (not shown) is pressed, the head chassis 1 slides from the position shown in FIG. 2 (the position shown by the two-dot chain line in FIG. 3) to the position shown by the solid line in FIG. Simultaneously with the slide, the pinch roller 10 is pressed against the rotating capstan 3 (see FIG. 3).

Then, the static electricity generated in the capstan 3 and the bearing 4 is led to the mechanical chassis (not shown) which is at the ground potential via the engaging portion 5 of the head chassis 1 via the conductive member 8. As a result, the static electricity is guided to the ground, so that the static electricity is not taken into the head wire, and the generation of noise from the speaker can be prevented.

The head chassis 1 is at the position shown in FIG. 2 (original position).
Is returned by the urging force of a return spring (not shown) mounted on the head chassis 1. Further, since the conductive member 8 is configured to be resilient, in the play state, as shown in FIG. 3, the conductive member 8 is held in a state of being pressed against the bearing 4 of the capstan 3 at the fixed position, and the head chassis is held. 1 is returned to the original position. When the head chassis 1 returns to the original position, the conductive member 8 also operates as a return spring, and the operation is performed by the cooperation of the conductive member 8 and the return spring.

Therefore, according to the conductive member 8 of this embodiment, in addition to letting the static electricity between the capstan 3 and the bearing 4 escape to the head chassis 1, an initial restoring force when the head chassis 1 returns to the original position is given. And can function as a return spring. Note that a considerable return force is required at the beginning of the return of the head chassis 1 to the original position due to mechanical friction between the head chassis 1 and the mechanical chassis or the like.

Further, according to the present embodiment, the locking portion 5 is formed on the head chassis 1, the engaging portion 9 which engages with the locking portion 5 is formed on the conductive member 8, and the conductive member 8 can be made elastic. Therefore, even if the head chassis 1 slides, the conductive member 8 can be disposed on the head chassis 1 without any trouble.
Since the conductive member is mounted on the sliding chassis, there is no more structural limitation of the slide chassis than when the conductive member is mounted on a fixed mechanical chassis. In the case where the engaging portion of the conductive member is fixed on the mechanical chassis, the head chassis 1 must have a structure in which the engaging portion support column can escape by the amount of the member movement, which is a large factor in determining the component shape. This is because there are restrictions.

Further, according to this embodiment, the mounting structure of the conductive member 8 is such that the engaging portion 9 is engaged with the locking portion 5 and both ends of the conductive member 8 are engaged with the holding portions 6 and 7. Only a simple structure can be obtained, the mounting can be facilitated, and the device can be manufactured at low cost.

FIG. 4 is a plan view showing another embodiment. In the present embodiment, both end edges of the conductive member 8 are always in contact with the bearing 4 of the capstan 3. That is, even when the play button (not shown) is not pressed (the conductive member 8 is shown by the solid line in FIG. 4), the locking portion 5 and the holding portion 5 6, 7, etc. are arranged. This example is configured as described above, and the rest is the same as the example of FIG.

According to this embodiment, since the conductive member 8 and the bearing 4 are always in contact with each other, if static electricity is generated, the static electricity can be immediately led to the ground, and the contact between the conductive member 8 and the bearing 4 from the speaker can be achieved. Generation of noise at the time of contact can be further prevented. The other operation and effect are the same as those in the example of FIG.

In the above-described embodiment, the example in which the bearing 4 is made of metal has been described. However, the present invention can be similarly applied to a case where a plastic collar is provided for the bearing. In this case, a cutout is formed in a part of the collar corresponding to the leading edge of the conductive member 8 so that the bearing 4 and the conductive member 8 come into contact with each other.

Further, in the above-described embodiment, an example in which the present invention is applied to a tape recorder is shown. However, the grounding device according to the present invention includes a conductive member that connects a charged body having at least one of which is movable and a chassis. The present invention can be similarly applied to other electronic devices.

[0036]

According to the present invention, a locking portion is formed on a sliding chassis, an engaging portion is formed on the conductive member to engage with the locking portion, and the conductive member is configured to be elastic. Therefore, even if the chassis moves, the conductive members can be arranged on the chassis without any trouble. Since the conductive member is mounted on the sliding chassis, there is no more structural limitation of the slide chassis than when the conductive member is mounted on a fixed mechanical chassis. Further, according to the present invention, since the engaging portion of the conductive member is engaged with the locking portion of the chassis and the linear portion of the conductive member can be simply engaged with the pair of holding portions, the structure can be simplified. Attachment (assembly) can be facilitated, and it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a diagram illustrating a use state of the embodiment.

FIG. 4 is a plan view of another embodiment.

FIG. 5 is a perspective view of a conventional example.

FIG. 6 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head chassis 3 Capstan 4 Bearing 5 Locking part 8 Conductive member 9 Engaging part

Continuation of the front page (72) Inventor Hiroyuki Nishirenchi 1-2-1 Ikenoba, Taito-ku, Tokyo Inside Iwa Corporation (56) References Japanese Utility Model Sho-60-51622 (JP, U) Japanese Utility Model Sho-63 118719 (JP, U) Hikaru 2-26135 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A grounding mechanism such as a tape recorder provided with an elastic conductive member for electrically connecting a charged body disposed on a mechanical chassis to a slide chassis made of a conductive material moving on the mechanical chassis. A linear member having a helix-shaped engagement portion is used as the conductive member; a first locking portion for locking the helix-shaped engagement portion on the slide chassis; A second locking portion is provided on both sides of the locking portion for locking a linear portion other than the helix-shaped engaging portion, and the charged body is provided via the conductive member and the first locking portion. A grounding mechanism for a tape recorder or the like, wherein the grounding member is grounded to the slide chassis and the conductive member is held by the slide chassis.