JPH0614303Y2 - Reel stand switching mechanism of magnetic recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reel base switching mechanism of a magnetic recording / reproducing apparatus, and more specifically, a take-up reel stand and a supply reel of a magnetic recording / reproducing apparatus such as a VTR. The present invention relates to a reel base switching mechanism capable of selectively transmitting rotational power to and from a base.

(Prior Art) A conventional reel base switching mechanism of this type, for example, as shown in FIGS. 3 (A) and 3 (B), has drive wheels 10 to which rotational power is transmitted by a capstan 101 via a belt 102.
3 and a swinging means H capable of selectively transmitting the rotational power transmitted to the drive wheel 103 to the winding reel stand 109 or the supply reel stand 110 by swinging.

The drive wheel 103 is composed of a pulley portion 103a and a gear portion 103b integral with the pulley portion 103a, while the swinging means H is used.
Is a swing lever 104, a stopper 106, and a swing gear 105 and a felt 10 sandwiched between these.
8 and a spring 107, and a swing gear 1
05 engages with the gear portion 103b of the drive wheel 103, and the swing lever 104 is rotatably supported by the central axis of the gear portion 103b.

Thus, when the capstan 101 rotates in the X direction of FIG. 3, the drive wheels 103 also rotate in the X direction, and the swinging means H swings the swinging head in the X direction as shown in FIG. 105 engages with the take-up reel stand 109. On the other hand, when the capstan 101 rotates in the direction opposite to X in FIG. 3, the driving wheel 103 also rotates in the direction opposite to X, and the swinging means H swings the head in the direction opposite to X, and the swinging gear 105.
Engages with the supply-side reel base 110.

(Problems to be Solved by the Invention) As described above, the conventional reel base switching mechanism switches the reel base according to the rotation direction of the capstan 101.

However, during tape loading, the capstan 10
The pinch roller is pressure-bonded to 1. Therefore, if it is attempted to switch the reel base during tape loading, it is necessary to release the pressure contact of the pinch roller. That is, when the pinch roller is pressed against the capstan 101, the capstan 101 feeds the tape and causes the tape to sag.
It is necessary to switch the reel stand after it is separated from the contact point, and to press the pinch roller against the capstan 101 again after the switching is completed.

Thus, it takes time to switch the reel stand,
There is a possibility that the position of the tape may shift due to the switching operation.

The present invention has been made in view of the above points, and an object of the present invention is to enable switching of the reel base in a short time even in the loading state, and also to prevent the tape position from being displaced. .

(Means for Solving the Problems) In the present invention, in order to achieve the above-mentioned object, a drive wheel driven by a capstan and a drive wheel are slidably fitted in parallel to the direction of the central axis thereof. A connecting plate that is fitted together and rotates together with the drive wheel, and can be fitted to the connecting plate, and can rotate coaxially with the drive wheel by the fitting, and the reel side reel stand and the supply side A pair of transmission wheels I and transmission wheels II respectively connected to the reel base so as to be capable of transmitting power, and the connecting plate are moved in parallel to the direction of the central axis of the drive wheels, whereby the transmission wheels I, or the transmission wheels. It is configured to include a switching lever so that the driving rotational force applied to the drive wheel by the capstan can be selectively transmitted to the winding-side reel base or the supply-side reel base by being fitted to II and rotated. .

(Operation) According to the above configuration, when the switching lever is operated to fit the connecting plate to the transmission wheel I, the rotational power of the capstan can be transmitted to the take-up reel stand, and the tape can be taken up in the reproduction direction. You can (During playback or recording.) Then, by operating the switching lever to fit the connecting plate to the transmission wheel II, the rotational power of the capstan can be switched and transmitted to the supply side reel stand, and the tape is wound in the reverse playback direction. be able to. (At the time of reverse rotation reproduction.) Thus, the reel base for transmitting the rotational power of the capstan can be switched by simply switching the switching lever regardless of the rotation direction of the capstan.

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

FIG. 1 shows an embodiment of the present invention, (A) is a schematic plan view,
(B) is a cross-sectional view of a main part thereof. 2 (A) and 2 (B) are equivalent to FIG. 1 showing different states of the embodiment.

First, in FIG. 1, the reel base switching mechanism K of the VTR is shown.
Is a drive wheel 3 driven by a capstan 1 via a belt 2 and a coupling which is coaxially rotated together with the drive wheel 3 and is slidably fitted in parallel to the direction of the central axis of the drive wheel 3. The plate 8 and the connecting plate 4, which are fitted to each other, can be rotated coaxially with the drive wheel 3 by the fitting, and the belt 8 can be transmitted to the take-up reel stand 6 and the supply reel stand 7 respectively. , 9 are coupled to each other by a pair of transmission wheels I10 and II11, and a switching lever 5 capable of moving the coupling plate 4 in parallel to the direction of the central axis of the drive wheel 3.

The connecting plate 4 projects to the right in FIG. 1B, and the through holes 3 formed in the drive wheel 3 and the transmission wheel I10, respectively.
It has a protrusion 4a that can be fitted into a and 10a, and a protrusion 4b that protrudes leftward in the figure and can be fitted into a through hole 11a formed in the transmission wheel II11.

The lower end portion of the switching lever 5 is rotatably supported by a support shaft 5b, and a holding portion 5a is formed at the upper end portion to hold the outer peripheral portion 4c of the connecting plate 4. Reference numeral 12 is a support shaft for the drive wheel 3 and both transmission wheels I, II 10, 11 and 13, 14, 15 are positioning spacers.

Thus, in FIG. 1, when the switching lever 5 is actuated in the B direction by a drive source (not shown) such as a solenoid or a loading motor, the connecting plate 4 translates in the C direction and the projection of the connecting plate 4 is moved. 4a through hole 10 of transmission wheel I10
The drive wheel 3 and the transmission wheel I10 rotate integrally as a result of fitting in a. On the other hand, since the projection 4b of the connecting plate 4 is separated from the through hole 11a of the transmission wheel II11, the transmission wheel II11 can rotate independently of the drive wheel 3. Therefore, when the capstan 1 rotates in the direction A of FIG.
And the transmission wheel I10 integrally rotates in the A direction, whereby the take-up reel stand 6 rotates in the A direction to wind the tape. (At the time of reproducing or recording.) Next, when the switching lever 5 is operated in the E direction in FIG. 2, the connecting plate 4 moves in the F direction, and the projection 4b of the connecting plate 4 is moved.
Is fitted into the through hole 11a of the transmission wheel II11, and the drive wheel 3 and the transmission wheel II11 rotate integrally. On the other hand, since the projection 4a of the connecting plate 4 is separated from the through hole 10a of the transmission wheel I10, the transmission wheel I10 can rotate independently of the drive wheel 3. Therefore, when the capstan 1 rotates in the D direction in FIG. 2, the drive wheel 3, the connecting plate 4 and the transmission wheel II11 rotate integrally in the D direction, whereby the supply reel stand 7 rotates in the D direction. Then, the tape is wound up (during reverse rotation reproduction). As described above, according to the reel base switching mechanism K, the connecting plate 4 and the transmission wheel I are operated by a simple switching rotation operation of the switching lever 5.
10, the power of the capstan 1 is transmitted to the take-up reel stand 6, or the connecting plate 4 and the transmission wheel II 11 are connected.
To connect the power of the capstan 1 to the reel stand 7 on the supply side.
Can be transmitted to. Therefore, even when the reel base is selectively switched during tape loading, it is not necessary to separate the pinch roller from the capstan 1 because it is not related to the rotation of the capstan 1, and the reel base can be selectively switched in a short time. It is possible to prevent the displacement of the tape.

As described above, according to the present invention, since there is no relation to the rotation of the capstan even when the reel base is selectively switched during tape loading, it is not necessary to separate the pinch roller from the capstan. The selection switching of can be performed in a short time, and the displacement of the tape can be prevented.

[Brief description of drawings]

1 (A) and (B) show an embodiment of the present invention, (A) is a schematic plan view, (B) is a cross-sectional view of the main part thereof, and FIG. 2 (A).
(B) is a view corresponding to FIG. 1 showing a different state of the embodiment. 3 (A) and 3 (B) are equivalent to FIG. 1 showing a conventional example. 1 ... Capstan, 3 ... Drive wheel, 4 ... Connecting plate, 5 ... Switching lever, 6 ... Winding side reel stand, 7 ... Supply side reel stand, 10 ... Transmission wheel I, 11 ... … Transmission wheel II.

Claims (1)

[Scope of utility model registration request] 1. A drive wheel driven by a capstan; a connecting plate slidably fitted to the drive wheel in parallel with a direction of a central axis of the drive wheel; A pair of transmission wheels I, which can be fitted to the connecting plate, can be rotated coaxially with the driving wheel by the fitting, and are respectively connected to the take-up reel stand and the supply reel stand so as to be able to transmit power. The transmission wheel II and the connecting plate are moved in parallel to the direction of the central axis of the drive wheel, whereby the transmission wheel I or the transmission wheel II is fitted and rotated, and the drive wheel is moved by the capstan. A reel base switching mechanism of a magnetic recording / reproducing apparatus, which comprises a switching lever capable of selectively switching and transmitting an applied driving torque to the take-up side reel base or the supply side reel base.