JPH0630187B2 - Reel stand drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel base driving device for selectively rotating left and right reel bases in different directions in a tape recorder or the like.

BACKGROUND ART AND ITS PROBLEMS Conventionally, this type of reel stand drive device is rollingly interposed between a drive source side rotating body and a reel stand, and an idler for transmitting a rotational force is pivotally supported by a shaft erected on an arm. The rotation of the arm causes the reel stand to come into contact with or separate from the reel stand so as to switch between transmission and non-transmission of the rotational force. However, the idler is always pressure-bonded to the drive source side rotating body. Therefore, there is a problem that the idler is deformed and a problem of wow and frutter is generated in the rotation of the reel stand.

SUMMARY OF THE INVENTION In view of the above, the present invention provides an idler rollingly interposed between the drive source side rotating body and the reel base so as to be separated from the drive source side rotating body when the rotational force is not transmitted. The present invention provides a reel stand drive device capable of preventing the deformation of the reel base and preventing the generation of noise during fast-forwarding when the rotating body is driven by a capstan motor.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a rotating body which is arranged in an intermediate position between left and right reel bases so as to be able to rotate forward and backward, and which rotates in accordance with a rotating direction of the rotating body around a rotating shaft of the rotating body. Rotation member attached to the rotating body through a slip mechanism and an idler support member loosely fitted to the rotation member. The rotation member and the idler support member are idler support members. Each of which has a pair of holding members and engaging members which are arranged symmetrically with respect to a line connecting the rotating shaft of the idler and the rotating shaft of the rotating body which are rotatably attached to the rotating body. According to the rotation of the rotating member, the holding member comes into contact with the engaging member to move the idler supporting member, and the idler is crimped between the rotating body and either the left or right reel stand,
The left and right reel stands are selectively driven to rotate in different directions.

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

In FIG. 1, (1) shows the whole reel base drive device of an example, and (2) and (3) are reel bases driven by the drive device (1).

The reel base driving device (1) will be described in detail with reference to FIGS. 2 to 4.

Reference numeral (11) is a motor, and a rotating body is axially supported by the rotating shaft (11a).

As an example of this rotating body, as shown in FIG.
A limiter sleeve (12) and a slip ring (13) that are press-fitted coaxially with (11a), and a metal bushing (14) that is fitted to the outer periphery from the limiter sleeve (12) to the slip ring (13), The reel pulley (15) is rotatably fitted in the upper half of the limiter sleeve (12).

The limiter sleeve (12) has a flange (12a) formed at the center, the slip ring (13) has a flange (13a) formed at the bottom, and the metal bushing (14) has a mirror-finished outer periphery to limiter sleeve (12). The limiter sleeve (12), the slip ring (13) and the metal bushing (14) are fitted between the flange (12a) and the slip ring (13) between the flanges (12a) and (13a). It is rotated integrally with (11a).

Further, the reel pulley (15) has a flange (15a) formed at the lower end from the inner circumference to the outer circumference, and by fitting the reel pulley (15) into the limiter sleeve (12),
The lower surface of the flange (15a) is superposed on the upper surface of the flange (12a) of the limiter sleeve (12) via a friction plate (16) such as felt attached to the upper surface, and the flange (15a)
A spring (18) is interposed between the upper surface of the inner peripheral part of (a) and the outer edge part (17a) of the stopper (17) fitted to the upper opening end of the limiter sleeve (12), and this spring (18 The friction plate (16) and the flange (15a) are maintained at a required contact pressure by the elastic force of (1).

(19) is a reel idler arm as a rotating member having this tubular portion (19a), on the upper surface side of the support surface portion (19b) formed in the direction orthogonal to this tubular portion (19a), Holding shafts (21a) (21b) as a pair of holding members are erected at required intervals. The cylindrical part (19a) of this arm (19) is a metal bushing.
It is rotatably fitted around the outer periphery of (14), and the felt receiver (20) is fitted in the lower half part so that it can be moved in the axial direction and engaged in the circumferential direction, for example, in the state of hexagonal connection. The idler friction spring (22a) is interposed between the felt receiver (20) and the support surface portion (19b). The lower side of the felt receiver (20) is the flange of the slip ring (13).
It is brought into contact with a friction plate (22b) such as felt attached to the upper surface of (13a), and is kept at a required contact pressure by the elasticity of the friction spring (22a). That is, the friction spring (22a) and the friction plate (22b) constitute a slip mechanism of the reel idler arm (19).

(24) is an idler support body in which a reel idler assembly (hereinafter abbreviated as reel idler) (23) is rotatably supported by a rotary shaft (25) and is loosely fitted on the support surface portion (19b) of the idler arm (19). ing. That is, on the peripheral surface of this idler support (24), an engaging edge portion (24a) engaged with an engaging groove portion (19c) formed at the peripheral edge of the support surface portion (19b) of the idler arm (19), and an idler An engaging member that is engaged with the holding shaft bodies (21a) (21b) erected on the arm (19) with a required play, for example, a pair of planar U-shaped engaging arms (25a) (25b). The idler support (24) is formed on the support surface portion (19b) of the idler arm (19), and the engaging edge portion (24a) is placed in the engaging groove portion (19c).
(25a) and (25b) are engaged with the holding shafts (21a) and (21b) respectively to hold the idler support (24) so that it can move a small amount in the width direction and the circumferential direction with respect to the reel pulley (15). is doing.

When the idler arm (19) and the idler support (24) are loosely fitted, the holding shafts (21a) (21b) and the engaging arms (25a) (25
The engagement position with b) is set on the center line a (see FIG. 2) in the width direction of the reel idler (28) or in the vicinity thereof, that is, within the width of the reel idler (23).

In the figure, (26a) and (26b) are sliders arranged on both sides of the shaft support portion of the reel idler (23) for smoothly pressing and rotating the reel idler (23) in the axial direction.

Next, the operation of the apparatus of this example configured as described above will be described.

Now, assuming that the motor (11) is rotationally driven in the direction of arrow A in FIG. 1, the limiter sleeve (12), the slip ring (13) and the metal bushing (14) are the motor rotating shaft (11a).
And the reel pulley (15)
Is rotated via the friction plate (16) of the limiter sleeve (12), and the idler arm (19) as a rotating member is also rotated via the friction plate (22b) of the slip ring (13) and the felt receiver (20). It is rotated in the same direction. By the rotational movement of the idler arm (19) as this rotating member, this idler arm
Holding shaft body (21a) as a holding member that is erected on (19)
(21b) is engaged with engaging arms (25a) (25b) as engaging members formed on the idler support (24)
(24) is also rotated together with the idler arm (19).

Due to the rotational movement of the idler support (24), the reel idler (23) rotatably supported on the idler support (24) by the rotation shaft (25), as shown by the chain double-dashed line in FIG. The reel idler (23) is rotated and moved together with the support (24), so that the reel idler (23) and the reel stand on the rotational movement side are moved.
The rotation force of the reel pulley (15) is transmitted to the reel stand (2) via the reel idler (23) by being crimped onto the reel stand (2), whereby the reel stand (2) is rotated.

Further, when the motor (11) is rotated in the direction opposite to the arrow A, the reel idler (23) rotates together with the idler support (24) along with the idler arm (19), and the reel idler (23) is moved in the same manner as the above case. ) Contacts the reel pulley (15) and also contacts the reel stand (3) due to the movement of the idler support (24) with respect to the idler arm (19), and the reel stand (3) is rotated by the reel pulley (15). Is transmitted.

When the rotation of the motor (11) is stopped, the reel idler (23) is pushed in the direction opposite to the rotational movement direction due to the inertia of the reel stand (2) or (3) on the verge of stopping, and the idler arm (19) is idled. The idler support (24) moves with respect to the idler arm (19) while being rotated so as to be pushed back through the support (24), and the reel idler (23) becomes the reel stand (2) or (3). Away from the reel pulley (15).

In this way, rotation of the motor (11) causes reel idler
(23) is interposed between the reel base (2) or (3) and the reel pulley (15) positioned in the rotation direction and is in contact with the reel pulley (15).
However, since the slip mechanism is interposed between the idler arm (19) with which the idler support (24) is engaged and the motor rotation shaft (11a), the reel idler (23)
The rotation is transmitted by the required contact pressure without being strongly interposed between the reel base (2) or (3) and the reel pulley (15).

Also, in this example, the idler arm (1
Since the engagement position with respect to 9) is located corresponding to the peripheral surface of the reel idler (23), the reel idler (23) moves from the peripheral surface direction to the idler arm (19) via the idler support (24).
As a result, the reel bases (2) (3) and the reel pulley (15) are evenly contacted over their entire widths, so that the rotational force can be stably transmitted.

In this example, between the idler arm (19) and the rotating part composed of the limiter sleeve (12), the slip ring (13) and the metal bushing (14) which are integrally rotated with the motor rotating shaft (11a). The intervening slip mechanism is configured by using a spring (22a) and a friction plate (22b) such as a felt together, but this slip mechanism can also use a hysteresis clutch or the like.

In addition, the rotating body (reel pulley (15)) is
Although it is rotated integrally with a), it may be rotated indirectly by a capstan motor or the like.

As described above, according to the present invention, the idler is
Since it is crimped only when transmitting rotational force to the reel stand, there is almost no risk of deformation such as an idler that is always crimped to the conventional rotating body, and it is possible to stably transmit rotational force to the reel stand and Further, when the rotary body is driven by a capstan motor, the idler is not rotated during fast-forwarding, so that the generation of noise is prevented and the user does not feel uncomfortable.

[Brief description of drawings]

FIG. 1 is a plan view showing a mounted state of the device of the present invention, FIG. 2 is a front view of an example of the device of the present invention, FIG. 3 is a side view with a part thereof cut away, and FIG. 4 is an exploded perspective view of the same. Is. In the figure, (2) and (3) are reel stands, (11) is a motor, (11a) is a rotating shaft, and (12), (13), (14) and (15) are limiters that constitute a rotating body. Sleeve, slip ring, bushing and reel pulley, (19) idler arm as a rotating member,
(21a), (21b) are holding shafts, (22a), (22b) are springs as a slip mechanism, friction plates, (23) are idlers, (24) are idler supports, (25a), (25b) Is an engaging arm as an engaging member.

Claims (1)

[Claims] 1. A rotating body, which is disposed in an intermediate position between the left and right reel bases, so as to be freely rotatable in the forward and reverse directions, and which rotates about a rotation axis of the rotating body in accordance with a rotating direction of the rotating body. A rotating member attached to the rotating body via a slip mechanism, and an idler support member loosely fitted to the rotating member,
The rotating member and the idler supporting member are a pair of holding members arranged symmetrically with respect to a line connecting the rotating shaft of the idler rotatably attached to the idler supporting member and the rotating shaft of the rotating body. And an engaging member, and the holding member abuts on the engaging member by the rotation of the rotating member according to the rotation direction of the rotating body to move the idler supporting member, and the idler is A reel stand drive device characterized by being crimped between a rotating body and either of the left and right reel stands so that the left and right reel stands are selectively driven to rotate in different directions.