JPH054125Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic recording/reproducing device such as a VTR (video tape recorder).

(Prior art and its problems) In a conventional magnetic recording/reproducing device, a dedicated motor for driving a cassette loading mechanism is provided, and the rotation shaft of the motor is connected to the input shaft of a power transmission gear mechanism of the cassette loading mechanism. or a rubber lining on the outer peripheral surface of the pulley of the rotating shaft of the motor and the pulley of the input shaft of the power transmission gear mechanism of the cassette loading mechanism. These pulleys are brought into pressure contact with each other.

Therefore, conventional devices require a dedicated motor to drive the cassette loading mechanism, and if the pulley is lined with rubber, the lining is troublesome, which is an obstacle to reducing costs. .

The present invention was developed in view of the above circumstances, and it is possible to drive the cassette loading mechanism without providing a dedicated motor for driving the cassette loading mechanism or applying rubber lining to the pulley. It is an object of the present invention to provide a magnetic recording/reproducing device with a simple configuration that can prevent malfunction of a cassette loading mechanism after loading is completed.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the magnetic recording and reproducing apparatus of the present invention includes a pulley body 23 for transmitting the rotational force of the loading mechanism 15 to drive the loading mechanism 15; 24 is provided on the rotating member 22 so as to be able to selectively contact and rotate the pulley 16 that rotates integrally with the rotating shaft of the capstan motor 3;
A slide body 28 provided so as to be reciprocally movable restricts the rotation of the rotary member 22 during its return movement so as to separate the pulley bodies 23 and 24 from the pulley 16. A spring 27 is stretched between the slide body 28 and the rotation member 22 to bias the slide body 28 in the backward movement direction, and when the slide body 28 moves forward, the rotation member 22 is The pulley bodies 23 and 24 are the capstan motor 3
The slide body 28 is biased to rotate in a direction in which it comes into pressure contact with the pulley 16 which rotates integrally with the rotation shaft 3a of the slide body 28, and the pulley bodies 23, 2
4 and brakes the rotation of the pulley bodies 23 and 24.

(Function) When the slide body 28 is moved forward against the spring 27, the braking of the pulley bodies 23 and 24 by the contact/separation portion 28a is released, and the rotation of the rotation member 22 is restricted by the slide body 28. When released, the rotating member 22 rotates under the biasing force of the spring 27.
As a result, the pulley body 2 provided on the rotating member 22
3 and 24 are in pressure contact with a pulley 16 that rotates integrally with the capstan motor 3, and the rotational force of the capstan motor 3 is transmitted to the loading mechanism 15 through the pulley bodies 23 and 24, thereby driving the loading mechanism 15. Ru.

Then, when loading is completed, the slide body 2
8 is moved back, this causes the rotating member 2
The above-mentioned rotation of 2 is restricted and the pulley body 2
3 and 24 are separated from the pulley 16, and the transmission of the rotational force of the capstan motor 3 to the loading mechanism 15 is stopped. At the same time, the contact/separation portion 2 of the slide body 28 is urged in the backward direction by the spring 27.
Since 8a comes into pressure contact with the pulley bodies 23, 24, the rotation of the pulley bodies 23, 24 is thereby braked and their involuntary rotation is prevented.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings. 1 is a plan view of the magnetic recording and reproducing apparatus of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, FIG. 3 is a view taken along the - line in FIG. Fig. 5 is a bottom view of the apparatus with the cassette loading mechanism removed.

First, the overall configuration of the magnetic recording/reproducing apparatus will be described with reference to these figures. In FIGS. 1 to 3, reference numeral 1 denotes a magnetic recording/reproducing device, and a chassis 2 has a capstan motor 3 attached thereto.

The rotational force of the capstan motor 3 is transmitted to the capstan 5a, which is a part of the tape drive mechanism 5, via the first power transmission mechanism 4, as shown in FIG. The speed is transmitted via the speed switching mechanism 7 to the supply reel stand 8 and the take-up reel stand 9, respectively.

The first power transmission mechanism 4 is provided on the lower surface of the chassis 2, and includes a small-diameter first pulley 10 fixed to the rotating shaft 3a of the capstan motor 3 and a lower end of the capstan 3. A large-diameter second pulley (flywheel) 11 with no groove that is fixed to the unit so as to be rotatable, and both pulleys 10,
The endless belt 12 is made of a flat belt made of rubber or the like and has a flat rectangular cross section and is wound between belts 11 and 11. The capstan 5a is rotatably installed on the upper surface of the chassis 2.

The second power transmission mechanism 6 connects the first power transmission mechanism 4 to the rotating shaft 3a of the capstan motor 3.
V fixed to the lower side of the first pulley 10 of
A small diameter first pulley 16 with a groove and the chassis 2
A large diameter V-grooved shaft rotatably fitted onto a shaft 18 whose upper end is fixed to a sub-chassis 17 mounted on the upper surface between the supply side reel stand 8 and the take-up side reel stand 9. a second pulley 19, an endless belt 20 made of a square belt made of rubber or the like wrapped between the two pulleys 16 and 19, and an endless belt 20 that is concentric with the center of the upper surface of the second pulley 19. It consists of a small-diameter gear 21 that is integrally provided, and the gear 21 meshes with the gear of the rotational speed switching mechanism 7.

On the other hand, the rotational force of the capstan motor 3 is
The first power transmission mechanism 4 and the rotational force transmission switching mechanism 1
3 and the third power transmission mechanism 14 to the cassette loading mechanism 15.

Note that the rotational force transmission switching mechanism 13 will be described in detail later.

As shown in FIGS. 2 and 4, the third power transmission mechanism 14 is formed by a V fixed to the lower end of a form 33 fixed to the input shaft 32 of one of the power transmission gear mechanisms 31 of the cassette loading mechanism 15. It consists of a grooved pulley 25, the second pulley body 24, and an endless belt 26 wound between these pulleys 24, 25.

The endless belt 26 is a square rubber belt having a substantially square cross section.

The cassette loading mechanism 15 loads the cassette 34 into the cassette housing (cassette loading section) 3.
5, the cassette 34 is inserted into the reel shafts 8a and 8 of the supply reel stands 8 and 9.
9a to set the mounting position, and by operating an eject mode setting operating body (not shown), the cassette 34 in the mounting position is ejected to the outside of the cassette housing 35, and the cassette 34 is set in the non-mounting position. It is something.

As shown in FIGS. 1 to 3, the cassette housing 35 is arranged between side plates 36 and 37 that are mounted upright on both sides of the front part of the chassis 2 from approximately the middle part in the front and back direction. It is attached so that it can slide freely. The cassette housing 35 has a bottom plate 35 on which the cassette 34 can be placed.
Side plates 35b and 35c are provided upright on both sides of a, and these side plates 35b and 35c are connected to a connecting rod 35d.
It is connected at. The cassette housing 35
The guide pins 38 and 39 protruding from the front and rear sides of the side plates 35b and 35c are connected to the side plates 36 and 35c.
The cassette housing 35 is slidably engaged in guide holes 40 and 41 arranged in parallel on the front and rear sides of the cassette housing 35, thereby supporting the cassette housing 35 between the side plates 36 and 37. The guide holes 40, 41
has an inverted L-shape in which vertical holes 40b, 41b are connected downwardly to the rear end portions of horizontal holes 40a, 41a. The cassette housing 3
Guide pin 3 at the front of both side plates 35b and 35c of 5
8 and 38 are connected to power transmission gear mechanisms 31 and 43 via forks 42, respectively.

The power transmission gear mechanism 31 on one side plate 36 (right side in FIG. 1) is provided on the outer surface of the one side plate 36. The one power transmission gear mechanism 31
are a worm 33, a worm wheel 44 that meshes with the worm 33, and first and second gears 45 and 46 that rotate coaxially with the worm wheel 44;
a fourth gear 48 that meshes with the second gear 46 and integrally forms a third gear 47 that meshes with the first gear 45 over a predetermined angular range on a part of the periphery of the outer surface;
and a fifth gear 49 that meshes with the fourth gear 48, and is connected to the guide pin 38 on the front side of the one side plate 36 via the fork 42 of the fourth gear 48. The power transmission gear mechanism 43 on the other side plate 37 side (left side in FIG. 1) is
The fifth gear 4 of the one power transmission gear mechanism 31
a first gear 50 that rotates coaxially with the first gear 5;
The second gear 51 is connected to the guide pin 38 on the front side of the other side plate 37 via the fork 42.

When the cassette 34 is fitted into the cassette housing 35 and placed in a predetermined state as shown by the solid line in FIGS. 2 and 3, a detection switch (not shown) detects the insertion. The capstan motor 3 is rotationally driven, and its rotational force is transmitted to the second power transmission mechanism 6 and the rotational force transmission switching mechanism 13.
The driving force is then transmitted as a driving force to one power transmission gear mechanism 31 and the other power transmission gear mechanism 43 of the cassette loading mechanism 15 via the third power transmission mechanism 14. As a result, Figures 2 and 3
From the state shown by the solid line in the figure, the cassette housing 35 moves horizontally inward along the horizontal holes 40a, 41a of the guide holes 40, 41 together with the cassette 34, and then moves vertically downward along the vertical holes 40b, 41b. The cassette 34 is moved to the position shown in FIGS. 2 and 3.
The mounting position is as shown by the two-dot chain line in the figure.

In the mounting position, the supply side reel stand 8 and the take-up tape are inserted into the center fitting holes (not shown) of the supply-side tape winding body and the take-up side tape winding body housed in the case 34a of the cassette 34. The reel shafts 8a and 9a of the side reel stand 9 fit together. Further, an opening/closing lid (not shown) provided on the opening surface of the rear end of the case 34a of the cassette 34 can be opened and closed.
It is opened at the mounting position No. 4. Further, at the mounting position of the cassette 34, the tape guide inclined pole 52 of the tape loading mechanism 52
a. The tape guide vertical pole 52b and the capstan 5a are respectively fitted into the case 34a through cutouts (not shown) in the bottom of the case 34a at positions inside the tape loop.

The cam plate 30 has its rotating shaft 53 connected to a rotating shaft 54a of a cam motor 54 via a fourth power transmission mechanism 55, and is rotated forward and backward by the cam motor 54.

Next, the rotational force transmission switching mechanism 13, which is a feature of the present invention, will be explained.

As shown in FIGS. 5 and 9, the rotational force transmission switching mechanism 13 has a rotating member 22 that is pivotally attached to the lower surface of the chassis 2 so as to be rotatable within a predetermined angle range. The rotating member 22 is pivotally attached to the lower surface of the chassis 2 at a substantially middle portion thereof. The rotating member 22
A first pulley body 23 with a V-groove is rotatably attached to one end of the pulley body 23 . A second pulley body 24 with a V groove is integrally provided on the upper surface of the first pulley body 23,
The second pulley body 24 is connected to a pulley 25 of the third power transmission mechanism 14 via an endless belt 26. The first pulley body 23 has a circumferential surface (V groove) that comes into contact with and separates from a portion of the endless belt 20 of the second power transmission mechanism 6 that is wound around the circumferential surface of the first pulley 10. At the time of contact, the first pulley body 23 rotates together with the endless belt 20.

The rotating member 22 is moved by a coiled spring 27 in a direction in which the circumferential side of the first pulley body 23 comes into pressure contact with the endless belt 20 (see FIGS. 5 and 6).
(clockwise in the figure). Said spring 2
7 is fixed at one end to the rotating member 22 and at the other end to a slide body 28 slidably attached to the lower surface of the chassis 2. The slide body 28 controls the rotation of the rotation member 22, and one end thereof is bent downward at a right angle, and the bent portion serves as a contact/separation portion 28a. The contact/separation portion 28a contacts/separates from the circumferential side of the second pulley body 24,
By applying a braking force to the second pulley body 24 at the time of contact, the cassette loading mechanism 15
is locked at the cassette loading completion position. The slide body 28 is biased by the spring 27 in a direction (downward in FIGS. 5 and 6) in which the contact/separation portion 28a comes into pressure contact with the circumferential surface of the second pulley body 24. The other end of the slide body 28 is connected to a cam portion 30a of a cam plate 30 via a rotation lever 29. The slide body 28
The engaging protrusion 28b protruding from the rotating member 22
It is abuttingly engaged with the notch-shaped engaging portion 22a.

The pivot lever 29 has a substantially middle portion thereof pivoted to the lower surface of the chassis 2 so as to be rotatable within a predetermined angle range, and one end of the pivot lever 29 is in contact with the other end of the slide body 28 . An engagement pin 29a is provided protruding from the other end of the rotating lever 29, and the engagement pin 29a engages with a cam portion 30a of the cam plate 30.
As the cam plate 30 rotates, the rotary member 2
2 is rotationally controlled.

Next, the operation of the magnetic recording/reproducing apparatus of the present invention having the above structure will be explained. First, in the cassette unloading state, the cam plate 30 is in the position shown in FIG. Further, as shown in FIGS. 6 and 8, the rotational force transmission switching mechanism 13 is in a state where the first pulley body 23 is in pressure contact with the endless belt 20 of the second power transmission mechanism 6, so that rotational force can be transmitted. Further, the contact/separation portion 28a of the slide body 28 is spaced apart from the circumferential side of the second pulley body 24.

When the cassette 34 is inserted into the cassette housing 35 to a predetermined set position from this state, a detection switch (not shown) detects the insertion, and the capstan motor 3 is driven to rotate in one direction based on the detection signal. The rotational force of the capstan motor 3 is transmitted to the power transmission gear mechanisms 31 and 43 of the cassette loading mechanism 15 via the second power transmission mechanism 6 → first pulley body 23 → third power transmission mechanism 14. The cassette loading mechanism 15 is driven to the loading side, and the cassette 34 is loaded to the loading position.

When the cassette loading is completed, a detection switch (not shown) detects this, and based on the detection signal, the rotational drive of the capstan motor 3 is stopped, and the drive of the cassette loading mechanism 15 is stopped. .

When the rotational drive of the capstan motor 3 stops, the detection switch detects this, and based on the detection signal, the cam motor 54 is rotated in the forward direction (as shown in FIG. 6).
The rotational force is transmitted to the cam plate 30 via the fourth power transmission mechanism 55, and the cam plate 30 rotates in the forward direction (clockwise in FIG. 6). Accordingly, the engagement pin 29a of the rotation lever 29 of the rotational force transmission switching mechanism 13 engages from the large diameter portion to the small diameter portion of the cam portion 30a of the cam plate 30, whereby the rotational force transmission switching mechanism 13 transfers the rotational force. Switches to a state in which transmission is not possible.

That is, the rotation lever 2 of the rotational force transmission switching mechanism 13
The engagement pin 29a of 9 is connected to the cam portion 30a of the cam plate 30.
By engaging with the small diameter portion of the rotating lever 2
9 rotates counterclockwise in FIG. 5, and with this rotation, the slide body 28 slides downward in FIG. 6 due to the biasing force of the spring 27. Due to the action of the rotating member 22, the spring 27
By rotating counterclockwise in FIG. 6 against the urging force of , the first pulley body 23 is separated from the endless belt 20 of the second power transmission mechanism 6, as shown in FIG. Power transmission becomes impossible.

Further, as the rotational force transmission switching mechanism 13 switches to a power transmission disabled state, that is, the slide body 28 slides downward in FIG. 28a is pressed against the circumferential side of the second pulley body 24, and a braking force is applied to the second pulley body 24. This allows the second
The pulley body 24 does not rotate involuntarily due to inertia or other external forces, and malfunctions of the cassette loading mechanism 15 due to involuntary rotation of the second pulley body 24 can be prevented.

From this state, the cam plate 30 rotates counterclockwise in FIG. The lever 29 rotates clockwise in FIG. 7, and the slide body 28 is pressed and slid upward in FIG. At the same time, the rotating member 22 rotates clockwise in FIG. 7 due to the biasing force of the spring 27, and the first pulley body 23
The circumferential side of the belt is pressed against the endless belt 20.
The state shown in FIG. 6 is reached again.

In each of the above embodiments, the endless belt 2
0 is constituted by a square belt with a square cross section, and the first pulley body 23 is provided with a V-groove, and the endless belt 20 is brought into contact with and separated from the V-groove, thereby ensuring power transmission.

(Effect of the invention) As described above, according to the magnetic recording and reproducing apparatus of the invention, the pulley bodies 23, 2 supported by the rotating member 22
Since the cassette loading mechanism 15 is driven by the rotation of the pulley 16 which rotates integrally with the rotating shaft 3a of the capstan motor 3, a dedicated motor for driving the cassette loading mechanism is provided. Since the cassette loading mechanism is driven using the rotational force of the capstan motor without using rubber lining on the pulley, the structure is simple, and miniaturization and cost reduction can be achieved smoothly.

Further, when the pulley bodies 23 and 24 are separated from the pulley 16, the contact/separation portion 28a of the slide body 28 comes into contact with the pulley bodies 23 and 24, and these pulley bodies
Since the rotation of the pulley bodies 3 and 24 is braked, malfunction of the cassette loading mechanism 15 due to the pulley bodies 23 and 24 inadvertently rotating due to inertia and other external forces can be reliably prevented.

Further, the spring force for biasing the rotating member 22 in the direction in which the pulley bodies 23 and 24 press against the pulley 16, and the contact/separation portion 28a of the slide body 28 are applied to the pulley body 2.
Since the spring force for urging in the direction of pressure contact with 3 and 24 is obtained by one spring 27,
There is no need to provide a spring for each, so the number of parts can be reduced, and the configuration can be simplified. The movements of approaching and separating from the pulley bodies 23 and 24 are reliably synchronized.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view of the magnetic recording and reproducing apparatus of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. 3 is a view taken along the - line in FIG. 4 is a view taken along the - line in FIG. 2, FIG. 5 is a bottom view of the device with the cassette loading mechanism removed, and FIGS. 6 and 7 show the main parts of the device. FIG. 8 is a sectional view taken along the - line in FIG. 7, and FIG. 9 is a sectional view taken along the - line in FIG. 6. 3... Capstan motor, 5... Tape drive mechanism, 8a, 9a... Reel shaft, 15... Cassette loading mechanism, 16... First pulley, 19
...Second pulley, 20...Endless belt, 2
2... Rotating member, 23... First pulley body, 24...
...Second pulley body, 27...Spring, 28...Slide body, 28a...Mounting/separation part, 34...Cassette, 3
5...Cassette housing.

Claims (1)

[Scope of utility model registration request] A cassette housing 35 that inserts and holds a tape cassette 34, a cassette loading mechanism 15 that transports the cassette housing 35 between a cassette insertion/removal position and a cassette playback position, and a cassette loading mechanism 15 that transfers the rotational force of the capstan motor 3 to the cassette loading mechanism. a pulley 16 fixed to the rotating shaft 3a of the capstan motor 3; ,
Pulley bodies 23 and 24 are supported by the rotating member 22 and are provided so as to be able to come into contact with and separate from the pulley 16, and an endless belt 26 that transmits the rotation of the pulley bodies 23 and 24 to the cassette loading mechanism 15.
The pulley bodies 23, 24 are provided so as to be reciprocally movable and restrict the rotation of the rotary member 22 during the return movement.
a slide body 28 that separates the
The slide body 28 is stretched between the slide body 28 and the rotation member 22, and urges the slide body 28 in the backward movement direction, and also rotates the rotation member 22 when the slide body 28 moves forward. The pulley body 2
A spring 27 that presses 3 and 24 against the pulley 16.
and a contact/separation part 28a which is provided on the slide body 28 and comes into contact with the pulley bodies 23, 24 to brake the rotation of the pulley bodies 23, 24 when the slide body 28 moves back. A magnetic recording and reproducing device.