JPH0654564B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a magnetic recording / reproducing apparatus capable of recording and reproducing both a standard tape cassette and a small tape cassette.

At present, a standard tape cassette and a small tape cassette having a smaller shape than this are known as tape cassettes used in magnetic recording / reproducing devices such as video tape recorders. In particular, small tape cassettes are widely used for video cameras. However, since both tape cassettes have different shapes, they cannot be used in the same magnetic recording / reproducing apparatus. Therefore, in order to use a small tape cassette in a magnetic recording / reproducing device for a standard tape cassette, prepare an adapter separately, attach the small tape cassette to the adapter, and then attach this adapter to the magnetic recording / reproducing device. Recording and reproducing.

However, in the above-described usage mode, it is not easy to handle because a separate adapter is required, and a small tape cassette needs to be attached to the adapter, and the adapter needs to be attached to the magnetic recording / reproducing device. For this reason, there has been a demand for a so-called dual-purpose magnetic recording / reproducing apparatus in which a standard or small-sized tape cassette can be directly mounted without using an adapter.

2. Description of the Related Art Conventionally, there is a magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 61-54069, for example, in which two tape cassettes having different sizes can be used in one device.

In this magnetic recording / reproducing apparatus, both the large and small tape cassettes are configured to be driven by directly fitting the supply-side and winding-side reels to the supply-side and winding-side reel disks. That is, depending on the size of each tape cassette, the reel disc is moved horizontally with respect to the mounted tape cassette, and when the reel disc moves to the reel position of each tape cassette, the tape cassette is fitted onto the reel disc and recorded / reproduced. It was configured to do.

However, there are some small tape cassettes that are generally supplied, in which the reel on the take-up side is driven through the gear portion of the lower flange. Has a problem that the above magnetic recording / reproducing apparatus cannot be used.

On the other hand, as a means for positioning the mounted tape cassette at a predetermined position, generally, a reference pin is provided upright in the magnetic recording / reproducing apparatus, and the tape cassette is placed on the reference pin for positioning. There is. Since the position of the reference pin also differs depending on the size of the tape cassette, it is necessary to change the standing position. However, in the magnetic recording / reproducing apparatus described above, the reel disk moving operation and the reference pin ascending / descending operation corresponding to each tape cassette are performed separately, so that the relative positional relationship between the reel disk and the reference pin is deviated. There was a problem of fear.

The present invention was created in view of the above points, and can be applied to both a standard tape cassette and a small tape cassette while maintaining the relative positional relationship between the reel disc and the reference pin with high accuracy. It is an object to provide a magnetic recording / reproducing device.

Means for Solving the Problems In order to solve the above problems, in the present invention, a magnetic recording / reproducing apparatus is provided with a main chassis, a small chassis and a small chassis drive mechanism.

The main chassis is provided with a positioning pin for positioning the standard tape cassette and a reel disk fitted in and driving the reel hub hole of the standard tape cassette.

The small chassis meshes with a positioning pin for positioning the small tape cassette, a reel gear portion formed on the reel disc, and a drive gear provided on the small tape cassette on the chassis body of the frame body, and the small chassis is engaged with the reel disc. An intermediate gear that transmits rotation to a drive gear is provided, and position regulating portions are formed at a plurality of locations on the chassis body.

The small chassis drive mechanism drives the small chassis in the vertical direction with respect to the main chassis.

Then, when mounting the standard tape cassette, the small chassis drive mechanism moves the small chassis down to a position where the intermediate gear and positioning pins provided on the small chassis do not interfere with the standard cassette. With the chassis drive mechanism, the small chassis is moved up to the position where the position restricting part contacts the main chassis to position the small chassis with respect to the main chassis.
The intermediate gear meshes with the reel gear of the reel disc as the small chassis moves up.

By configuring the magnetic recording / reproducing apparatus as described above, the magnetic recording / reproducing apparatus can selectively mount the standard tape cassette or the small tape cassette and perform the recording / reproducing process on either tape cassette. Become.

The positioning pins for the standard tape cassette are provided on the main chassis, while the positioning pins for the small tape cassette are provided on the chassis body of the frame body, and they are collectively moved as the small chassis is moved up and down. Therefore, the relative position of each positioning pin does not shift.

Further, since the small chassis is in the upward movement position and the respective position regulating portions are brought into contact with the main chassis, the small chassis is positioned with high accuracy.

Example Next, an example of the present invention will be described. 1 and 2
FIG. 1 is an enlarged view of a portion near a reel, which is a feature of the present invention, in a magnetic recording / reproducing apparatus 1 (hereinafter, simply referred to as an apparatus) that is an embodiment of the present invention. In the device 1 shown in each drawing, a standard tape cassette 2 and a small tape cassette 3 having a smaller shape than that (indicated by two-dot chain lines in the drawings) are selectively mounted, and which tape cassette 2 or 3 is to be mounted. This is a so-called dual-purpose device that can also perform magnetic recording and reproduction.

First, the standard tape cassette 2 and the small tape cassette 3 mounted in the device 1 will be described with reference to FIGS. 3 and 4. FIG. 3 shows the standard tape cassette 2.
On the bottom surface 2a of the standard tape cassette 2, reel hub holes 4a and 4b, which are respectively formed on the supply and take-up reels and into which reel disks (described later) of the apparatus 1 are inserted, are exposed. Reference numeral 5 is a hole into which a reel brake release pin (described later) is inserted. Further, 6a and 6b are positioning holes with which the positioning pins engage, and 6c and 6d are positioning contact portions with which the positioning pins abut.

On the other hand, the small tape cassette 3 shown in FIG. 4 has a shape smaller than the standard tape cassette 2. A reel hub hole 7 having the same structure as the reel hub hole 4a formed in the supply reel of the standard tape cassette 2 is formed on the supply reel provided inside the small tape cassette 3 and is exposed on the bottom surface. A reel hub hole is not formed in the lower flange of the take-up reel, but a drive gear 8 is provided instead of the reel hub hole, and a part of this drive gear 8 is formed on the side portion of the small tape cassette 3. The opening 3b is exposed. The small tape cassette 3 is also positioned at a predetermined mounting position by the positioning pin. 9a, 9
Reference numeral b is a positioning hole with which the positioning pin engages, and reference numerals 9c and 9d shown by broken lines in the drawing are positioning contact portions with which the positioning pin abuts.

The device 1 is configured so that magnetic recording / reproducing processing can be performed on each of the above tape cassettes 2 and 3. The configuration of the device 1 will be described below with reference to FIGS. 1 and 2 again.

The device 1 is roughly arranged on a main chassis 10 (indicated by a chain line in the drawing), a small chassis drive mechanism 11, a reel brake drive mechanism 12, a reel drive mechanism 13, and a main cam 14.
Etc. are arranged. Small chassis drive mechanism 1
1 and the reel brake drive mechanism 12 are both the main cam 1
4 and the main cam 14 is driven by the cam motor 1
Driven by 5. Further, the reel drive mechanism 13 selectively transmits the rotation of the reel motor 16 to the supply-side reel disk 17 or the winding-side reel disk 18. Positioning pins 19a to 19d for standard tape cassettes are provided upright at predetermined positions of the main chassis 10. The standard tape cassette 2 has these positioning pins 19
By engaging or abutting a to 19d with the positioning holes 6a, 6b and the positioning abutting portions 6c, 6d, the device 1
It is uniquely positioned at a predetermined position inside.

Here, for convenience of description, each of the above-mentioned mechanisms 11 to 13
Will be explained separately.

(1) First, the small chassis drive mechanism 11 will be described.

FIG. 5 is a main part configuration diagram showing the small chassis drive mechanism 11. The small chassis drive mechanism 11 is generally a small chassis 2
0, lifting levers 21a to 21d, lifting shaft 22 and the like, which move the small chassis 20 up and down in the vertical direction with respect to the paper surface. As will be described later, when the small chassis 20 moves upward, the device 1 enters a mode in which recording / reproduction is performed on the small tape cassette 3 (hereinafter, referred to as small mode), and when the small chassis 20 moves downward, the device 1 moves. This is a mode in which recording / reproduction is performed on the standard tape cassette 2 (hereinafter referred to as standard mode).

As shown in FIG. 6 and FIG. 7, the small chassis 20 is a substantially rectangular frame-like body made of a metal material, and an intermediate gear 23 is rotatably attached to the upper surface thereof and used for a small tape cassette. Positioning pins 24a to 24d are provided upright. The intermediate gear 23 includes a small-diameter gear portion 23a that meshes with the drive gear 8 (see FIG. 4) of the small-sized tape cassette 3 in the small-sized mode, and a reel gear portion 18a (see FIG. 1) formed below the winding-side reel disk 18. Each of the gear parts 23.
The a and 23b are configured to rotate integrally. Further, the positioning pins 24a to 24d are engaged or abutted with the positioning holes 9a and 9b and the positioning abutting portions 9c and 9d formed in the small tape cassette 3 in the small mode, whereby the small tape cassette 3 is installed in the apparatus 1. Is uniquely positioned at a predetermined position.

Further, when the small chassis 20 is moved upward, it is located in the vicinity of the four corners of the upper surface of the small chassis 20 in the vertical direction (arrows Z ₁ , Z _{2 in the} figure).
Position regulating portions 25a to 2 that regulate the position in the direction shown by
5d is formed, and a position regulating portion 26 that regulates the position of the small chassis 20 with respect to the main chassis 10 in the plane direction (direction of arrows Y ₁ and Y _{2 in the} figure) is provided at predetermined two positions on the side surface.
a and 26b are formed (each position regulating portion 25a-2
The functions of 5d, 26a and 26b will be described later).

Next, the elevating levers 21a to 21d that support the small chassis 20 and move it up and down will be described. The elevating levers 21a to 21d are attached to the short side surfaces 20a and 20b of the side surfaces of the small chassis 20 and support the small chassis 20 at the four corners thereof. Since the configuration of the lifting levers 21a to 21d and the mounting structure to the small chassis 20 are substantially the same on each side surface 20a, 20b, the AA arrow view in FIG. 5 is shown in FIG. 8 and FIG. Only the side will be explained. The reference numerals of the configuration on the side surface 20b side are shown in parentheses in this specification.

As shown in FIGS. 8 and 9, the elevating levers 21a, 2
1b (21d, 21c) is a plate-like body having a substantially Z shape, and is arranged on both sides of the side surface 20a (20b).

In each figure, the lifting lever 21a (21d) on the left side penetrates and is fixed to the lifting shaft 22, so that the lifting lever 21a (21d) rotates integrally with the lifting shaft 21a with the lifting shaft 22 as the center of rotation. Move. On the other hand, the lifting lever 21b (21c) on the right side is a sub chassis 27 (28, which is fixed to the main chassis 10).
7, 28 are rotatably supported by a pin 29 (30) which is planted in a dashed line in FIG. The pair of elevating levers 21a, 21b (21c, 21d) are connected by a link 31 (32) and are configured to be integrally rotated and displaced.

Further, the elevating levers 21a, 21b (21c, 21d) are formed with elongated holes 33, 34 and projections 35, 36, respectively.
Engaging pins 37a, 37b (37c, 37d) planted on the side surface 20a of the small chassis 20 penetrate and engage with the long holes 33, 34, and the projections 35, 36 and the long holes 33, 34 are engaged.
Torsion springs 38, 39 are stretched between the engaging pins 37a, 37b protruding from the. Therefore, the engagement pins 37a and 37b are urged relatively upward by the torsion springs 38 and 39 along the elongated holes 33 and 34 (direction indicated by arrow B in the figure) (the side surface 20b side). Long holes, protrusions, and torsion springs do not appear in the figure, and in the figure, numeral 42 is a reel brake release pin of the standard tape cassette 2 and is implanted in the main chassis 10.)

Next, the operation of the small chassis drive mechanism 11 configured as described above will be described. FIG. 8 shows the small chassis drive mechanism 11 in the standard mode, and FIG. 9 shows the small chassis drive mechanism 11 in the small mode.

In the standard mode, the elevating levers 21a to 21d are rotated clockwise, and the small chassis 20 is in the down position. At this time, the intermediate gear 23 arranged on the small chassis 20
And the positioning pins 24a to 24d are used for the main chassis 10.
Of the positioning pins 19a to 19d for the standard tape cassette 2, which are lower than the standard height position of the positioning pins 19a to 19d for the standard tape cassette 2. Is configured. Therefore, in the standard mode, the small chassis 20 and the components 23, 24a to 24d arranged on the small chassis 20 do not interfere with the recording / reproducing process of the standard tape cassette 2. Also, the engagement pins 37a implanted in the small chassis 20
37d is a long hole 33,3 by the torsion spring 38,39.
Since it is pressed to one end of the No. 4, the small chassis 20 does not rattle in the standard mode.

Next, the operation of the small chassis drive mechanism 11 when shifting from the standard mode to the small mode will be described. The device 1 detects the type of the tape cassette to be inserted and changes the mode of the device 1 to the standard or small mode. When it is detected that the tape cassette in which the device 1 is inserted is the small tape cassette 3 and the current mode is the standard mode, the small chassis drive mechanism 11 starts its operation.

The small chassis drive mechanism 11 is driven by rotating the elevating shaft 22. The elevating shaft 22 is rotated by the main cam 14 as described later. When the small chassis 20 moves upward, the elevating shaft 22 rotates counterclockwise in FIG. 8, so that the elevating lever 21a (21d) fixed to the elevating shaft 22 also rotates counterclockwise. Along with this, the other elevating levers 21b (21c) are also urged to rotate via the links 31 and 32 and rotate counterclockwise around the pin 29 (30).

As a result, the small chassis 20 has a parallel crank mechanism in which the link length (turning radius) is set between the lifting shaft 22 and the engaging pins 37a (37d) and between the pins 29 (30) and the engaging pins 37b (37c). The small chassis 20 moves upward while maintaining the parallelism with the main chassis 10.

The small chassis 20 reaches the upper limit, and the small chassis drive mechanism 1
FIG. 9 shows the state in which 1 is in the small mode. In this state, the large-diameter gear portion 23b of the intermediate gear 23 meshes with the reel gear portion 18a of the winding reel disk 18 (see FIG. 2). Whether or not the small chassis 20 reaches the upper limit is determined by a small chassis detection sensor (not shown) provided on the back surface of the main chassis 10.

The meshing of the gears is performed as the small chassis 20 moves upward. At this time, the small chassis 20 is moved upward in a swinging state around the elevating shaft 22 and the pins 29 and 30 by the parallel crank mechanism described above. Further, the positions of the engaging pins 37a, 37b (37c, 37d) are higher than the line connecting the lifting shaft 22 and the pin 29 (30) (the one-dot chain line indicated by the arrow c in the figure) at the position where the gears mesh with each other. Is configured. Therefore, the gear portions 23a, 2 of the intermediate gear 23 are
Reference numeral 3b is a state in which an arc is drawn, in other words, the drive gear 8 is moved along a movement locus including a horizontal direction component (a component indicated by an arrow Y _{1 in the} drawing).
Since the gears mesh with the reel gear portion 18a, the gears mesh smoothly.

Now, the small chassis 20 is simply in the Z ₁ and Z ₂ directions (vertical direction).
Considering the case of only movement, only the drive gear 8 and the small diameter gear portion 23a and the reel gear portion 18a and the large diameter gear portion 23b.
When the teeth of the small chassis 20 come into contact with each other as the small chassis 20 moves upward, the gears do not mesh with each other and the upward movement of the small chassis 20 is also restricted. However, by moving the small chassis 20 upward along the movement path as described above, the meshing of the intermediate gear 23 with the drive gear 8 and the reel gear portion 18a and the upward movement of the small chassis 20 can be smoothly performed.

In the small mode shown in FIG. 9, the small chassis 2
0 is biased in the direction of arrow B in the figure by the torsion springs 38 and 39. Also, as described above, the small chassis 2
On the upper surface of 0, the position regulating parts 25a to 25d, 26a, 26
b is formed (see FIGS. 5 to 7). Among them, the position regulating portion 25a~25d is in contact with the rear portion of the main chassis 10 in a compact mode, and the position regulation of in the arrow Z _1, Z ₂ direction of the small chassis 20. Further, the position restricting portions 26a and 26b contact the edge portions of the openings 10a and 10b formed in the main chassis 10 in the Y ₁ direction in the figure, thereby restricting the position in the Y ₁ and Y ₂ directions in the figure. (See FIG. 5). At this time, since the small chassis 20 is biased by the torsion springs 38 and 39 in the arrow B direction in the figure, this biasing force is divided into the Z direction and the Y ₁ direction in the figure, and the component force in the Z ₁ direction. Serves as a force for pressing the position regulating portions 25a to 25d against the back surface of the main chassis 10, and the component force in the Y ₁ direction is the position regulating portion 2
It acts as a force that presses 6a and 26b against the edges of the openings 10a and 10b. The positioning in the directions of the arrows X ₁ and X ₂ in the figure is performed by the elevating levers 21a to 21d and the sub chassis 27 and 28 described above. in this way,
The small chassis 20 is surely positioned in the three directions X, Y, and Z, so that the small chassis 20 is positioned with respect to the main chassis 10 with high accuracy.

In addition, the small tape cassette 3 is provided with the positioning pins 2 that are erected on the small chassis 20 that is positioned with high accuracy in this way.
It is positioned by 4a to 24d. As described above, each of the positioning pins 24a to 24d is erected on the small chassis 20 that is a frame-shaped body, and each of the positioning pins 24a to 24d.
The vertical movement of 24d is performed collectively by vertically moving the small chassis 20. Therefore, the relative positions of the positioning pins 24a to 24d do not change when the mode is changed. Therefore, the small-sized tape cassette 3 is positioned and mounted at a predetermined position in the device 1 with high accuracy, so that the smooth loading operation and the recording / reproducing process can be realized. The standard tape cassette 2 is positioned by the standard tape cassette positioning pins 19a to 19d in the standard mode. Since the positioning pins 19a to 19d are erected on the main chassis 10, their relative positions are different. It has been decided.

On the other hand, the tape cassette is generally provided with a erroneous erasure prevention claw, and when the erroneous erasure prevention claw is cut out, the device 1 detects this and recording is performed on the tape cassette. There is no configuration. The small tape cassette 3 is also provided with erroneous erasure prevention claws 3c at predetermined positions on its side surface, as shown in FIG. The sensor 40 detects whether or not the erroneous erasure prevention claw 3c is cut out. However, since the erroneous erasure prevention claw 3c is located higher than the bottom surface 3a of the small tape cassette 3, the positioning pin 24a is provided. If the small chassis 20 is fixedly mounted on the small chassis 20 together with .about.24d, the small chassis 20 comes into contact with the bottom surface of the standard tape cassette 2 because of the large protrusion amount. Therefore, as shown in FIG. 10, the sensor 40 is attached to one end of a lever member 41 configured to be rotatable on the main chassis 10, and the other end is attached to the lifting lever 2.
It is configured to be connected to 1a (21d). Lift lever 2
When the 1a (21d) is in the standard mode position, the sensor 40
Is in a lying state as indicated by a chain double-dashed line in the figure, and is retracted to a position where it does not interfere with the recording / reproducing process of the standard tape cassette 2. The lever member 41 is rotated by the rotational displacement of the elevating lever 21a (21d) associated with the change to the small mode, and the sensor 40 faces the erroneous erasure prevention claw portion 3c of the small tape cassette 3 and is cut out. To detect With the above configuration, the standard tape cassette 2
It is possible to prevent erroneous erasure of the small tape cassette 3 without affecting the recording / reproducing process of.

(2) Next, the reel brake drive mechanism 12 and the reel drive mechanism 13 will be described below mainly with reference to FIGS. 11 to 14.

The reel brake drive mechanism 12 roughly includes the brake levers 43 and 44 and the link members 45 to 5 connected thereto.
Link mechanism composed of 0, supply side reel disc 1
7 and the brake devices 51 and 52 provided in the winding-side reel disc 18 (the brake devices 52 in the supply-side reel disc 17 are not shown because the brake devices 51 and 52 have the same configuration). It is configured and is driven by the main cam 14.

In the link mechanism, the brake levers 43 and 44 and the link members 47 and 48 are configured to be displaceable in the directions of arrows X ₁ and X ₂ in the figure. The link member 45 has one end rotatably connected to the brake lever 43 and the other end rotatably connected to the link member 47. The substantially central position is rotatably supported by a pin 53 fixed to the main chassis 10. Similarly, the link member 46 also has the brake bar 44.
And the brake member 48, and its central position is supported by the pin 54. Also, the link member 47,
The link member 48 is connected by link members 49 and 50, and a substantially central position of the link member 49 is rotatably supported by a pin 55 implanted in the chassis member 10. Further, a cam pin 56 projecting downward is planted at the end of the link member 47 in the X ₂ direction. The cam pin 56 is engaged with a groove cam 14 a formed on the upper surface of the main cam 14. Also in the X ₂ direction end portions of the X ₁ direction end portion and the brake lever 44 of the brake lever 43 respectively inclined portion 43a,
44a is formed. In the link mechanism, when the cam pin 56 is displaced in the X ₂ direction, the brake lever 43 is displaced in the X ₁ direction and the brake lever 44 is displaced in the X ₂ direction. In other words, when the cam pin 56 is engaged with the large diameter portion 14a- ₁ of the cam groove 14a, the brake lever 4
3 is displaced in the X ₁ direction, the brake lever 44 is displaced in the X ₂ direction (in the direction in which the brake levers 43 and 44 approach), and when the cam pin 56 is engaged with the small diameter portion 14a- ₂ , The brake lever 43 is displaced in the X ₂ direction, and the brake lever 44 is displaced in the X ₁ direction (the direction in which the brake levers 43, 44 are separated from each other).

Next, the brake devices 51 and 52 will be described. As described above, the braking devices 51 and 52 have the same configuration (however,
Since the respective parts are arranged symmetrically), only the brake device 51 will be described in an enlarged manner in FIGS. 15 and 16.

The brake device 51 is provided on the main chassis 10 in the winding reel disk 18. The take-up reel disk 18 is composed of a main body portion 18b and a hub drive shaft 18c integrally formed on the upper portion thereof, and the main body portion 18b and the hub drive shaft 18c are freely rotatable on a shaft 57 provided upright on the main chassis 10. Is supported by. Further, the reel gear portion 18a is formed below the body portion 18b. Therefore, the reel-side reel disk 18 is rotated by rotationally driving the reel gear portion 18a.

The inside of the main body portion 18b is annularly penetrated and forms a space portion with the main chassis 10. Brake device 51
Are arranged by utilizing this space.

The brake device 51 includes a brake arm 58, a brake shoe 59, a torsion spring 60, and a brake lever 43.
Etc. The brake arm 58 is rotatably supported by a pin 61 planted in the main chassis 10, and a brake shoe 59 made of rubber or the like is attached to a position where the tip end of the brake arm 58 faces the inner wall of the main body 18b. . Further, a brake pin 62 is provided on the bottom surface of the brake arm 58 so as to project, and the brake pin 62 is engaged with the inclined portion 43 a of the brake lever 43 arranged on the back surface of the main chassis 10.

The torsion spring 60 has one end attached to the brake arm 58 and the other end fixed to the main chassis 10.
It is attached to 3. The brake arm 58 is always urged by the torsion spring 60 against the inner wall of the main body portion 18b. Therefore, the brake lever 43 is moved to the arrow X _{1 in the} figure.
By displacing in the direction, the brake pin 62 moves relatively upward on the inclined portion 43a, the brake shoe 59 is separated from the inner wall of the main body portion 18b, and the brake is released.
Conversely, when the brake lever 43 is displaced in the X ₂ direction, the brake pin 62 moves downward on the inclined portion 43a, and the brake shoe 59 is pressed against the inner wall of the main body portion 18b via the elastic force of the torsion spring 60, The brake is activated.

In the brake device 51 having the above-mentioned configuration, the respective components are compactly arranged in the winding-side reel disc 18. For this reason, since the constituent parts of the brake device 51 are eliminated from the outer portion of the take-up side reel disc 18, the structure around the reel can be simplified and the device 1 can be downsized.
Space saving and cost reduction can be achieved. Further, the brake device 51 is dust-proof because the upper part is covered by the main body part 18b and the lower part is covered by the main chassis 10, so that dust is not attached to the brake shoes 59 and a stable braking force is always obtained. You can

Returning to FIG. 11 again, description will be made. As described above, the brake devices 51, 52 can perform brake release (hereinafter, brake OFF) and brake operation (hereinafter, brake ON) by displacing the brake levers 43, 44. Reel brake drive mechanism 12
Then, the cam pin 56 has the large diameter portion 14a- _{1 of the} cam groove 14a.
When the brakes are off, the brakes 51, 52 are turned off.
When the cam pin 56 is in the small diameter portion 14a- ₂ , each of the brake devices 51 and 52 is configured to be in the brake ON state.

Next, the reel drive mechanism 13 will be described below with reference to FIG. The reel drive mechanism 13 includes a main chassis 10 formed between the reel disks 17 and 18.
Is disposed in the opening 10a. The reel drive mechanism 13 is generally referred to as a reel motor 16 and a swing idler 6
4, an intermediate gear 65 on the supply side, an intermediate gear 66 on the winding side, and the like.

The reel motor 16 is attached to a reel motor bracket 67 fixed to the main chassis 10, and the reel motor bracket 67 is provided with the swing idler 64 and the intermediate gears 65 and 66. The intermediate gears 65 and 66 are connected to the reel disks 17 and 18 respectively.
Meshes with the reel gear portions 17a and 18a formed on the. The swing idler 64 swings in accordance with the rotation direction of the reel motor 16 and selectively abuts on the supply side intermediate gear 65 or the winding side intermediate gear 66, and the supply side reel disc 17 or the winding side. The rotational force of the reel motor 16 is transmitted to the reel disk 18.

As shown in FIG. 17, the swing idler 64 is provided with an idler pin 68.
Is connected to the link members 47, 48 constituting the reel brake drive mechanism 12 via the idler attachment / detachment bar 69, and the idler attachment / detachment bar 69 is displaced in conjunction with the displacement of the ring members 47, 48 to displace the neck. A swinging motion of the swing idler 64 is controlled. As a result, after the brake is turned on, it becomes possible to quickly stop the transmission of the rotational force of the reel motor 16 to the reel disks 17 and 18.

(3) Next, the structures of the main cam 14 and the small cam gear 70 and the relationship between these and the operation of the mechanisms 12 and 13 will be described.

As shown in FIG. 2, the main cam 14 is rotatably attached to a sub chassis 73 fixed to the main chassis 10. The main cam 14 is provided with a cam groove 14a on the upper surface thereof, with which the cam pin 56 is engaged, a gear portion 14b is formed on the lower outer peripheral position thereof, and a sliding cam 14c is formed on the lower outer peripheral position thereof. ing.
The cam groove 14a has the large-diameter portion 14a- ₁ and the small-diameter portion 14a- ₂ as described above, and has a 360-degree continuous cam shape. Further, a cutout portion 14b- ₁ (appearing in FIG. 2) is formed over a predetermined range of the gear portion 14b to form an intermittent drive gear. Further sliding cam 14c
Forms a peripheral cam and has a shape having a large diameter portion 14c- ₁ and a small diameter portion 14c- ₂ (sliding cam 14c
The planar shape of is shown in FIGS. 11 to 14. The main cam 14 having the above structure is driven by the cam motor 15. The rotation of the cam motor 15 is transmitted to the worm 72 by the belt 71 as shown in FIG. The worm 72 meshes with the gear portion 14 b of the main cam 14, and the main cam 14 is rotationally driven by the cam motor 15.

The small cam gear 70 is also rotatably attached to the sub-chassis 73, a worm 70a is provided on the upper portion thereof, a gear portion 70b is provided on the lower outer peripheral position thereof, and a small cam portion 70c is further provided on the lower outer peripheral position thereof. (See Figure 2).

The worm 70a meshes with a worm wheel 74 provided at the end of the elevating shaft 22 constituting the small chassis drive mechanism 11 in the X ₂ direction (detailed in FIG. 5). Further, the gear portion 70b is the gear portion 14 of the main cam 14.
It is configured to be meshed with b, and is configured to be able to enter into the notch portion 14b- ₁ formed in the gear portion 14b of the main cam 14. Therefore, the small cam gear 70 rotates according to the rotation of the main cam 14 when the gear portion 70b meshes with the gear portion 14b of the main cam 14,
When the gear portion 70b enters the notch portion 14b- ₁ , the rotation transmission is cut off and the gear portion 70b stops. Further, the small cam portion 70c is formed so as to face the sliding cam 14c formed on the main cam 14, and projections 70c- ₁ and 70c- ₂ (detailed in FIGS. 11 to 14) are formed at predetermined two places. ing. The protrusions 70c- ₁ and 70c- ₂ are the large diameter portion 1 of the sliding cam 14c.
4c- ₁ to engage with the projection 70c.
When _-1 , 70c- ₂ are engaged with the large diameter portion 14c- ₁ , rotation of the small cam gear 70 is restricted. Also, the large diameter portion 14c-
The formation range of _{1 and} the formation range of the notch 14b- ₁ are configured to coincide with each other. Therefore, the protrusions 70c- ₁ ,
While the small cam gear 70 is restricted from rotating in the state in which 70c- ₂ is engaged with the large diameter portion 14c- ₁ , the main cam 14 is in a rotatable state.

Next, the operation of the small cam gear 70 and the mechanisms 11 and 12 accompanying the rotation of the main cam 14 will be described. The operation when the mode is changed from the standard mode to the small mode will be described here.

FIGS. 8, 11 and 12 show the device 1 in the standard mode. In the standard mode, the small chassis 20 is located in the down position as shown in FIG. Further, as shown in FIG. 11, projections 70c- ₁ and 70c- ₂ formed on the small cam portion 70c of the small cam gear 70.
Engages with a large diameter portion 14c- ₁ formed on the sliding cam 14c of the main cam 14. Therefore, the rotation of the small cam gear 70 is restricted.

When the rotation of the small cam gear 70 is restricted, the main cam gear 1
The rotation of 4 is not transmitted to the worm wheel 74 provided on the elevating shaft 22 (see FIG. 5). Since the small chassis drive mechanism 11 is driven by rotating the elevating shaft 22 as described above, the small chassis 20 is controlled while the rotation of the small cam gear 70 is restricted.
Is restricted from moving up and down. Therefore, in this state, the small chassis 20 is stopped at the down position.

On the other hand, paying attention to the reel brake drive mechanism 12, it is necessary to freely turn the brake on and off in the standard mode. As described above, the brake ON and the brake OFF are performed by displacing the cam pin 56 (see FIG. 11) forming the reel brake drive mechanism 12 in the X ₁ and X ₂ directions in the figure. The brake ON and the brake OFF must be performed with the small chassis 20 stopped at the down position. Therefore, the protrusion 70 of the small cam gear 70
c- _1, large 70c- ₂ is of the sliding cam 14c diameter portion 14c- _{1
One of the} points where the cam pin 56 moves from the large-diameter portion 14c- ₁ of the groove cam 14c to the small-diameter portion 14c- ₂ (hereinafter referred to as displacement points, which are indicated by arrows E and F in the figure) in the range in which the cam pin 56 is engaged with. The displacement point E is provided. That is, the cam pin 56 is displaced and the brake ON and the brake OFF can be performed by the rotation of the main cam 14 in the range in which the small cam gear 70 does not rotate. Fig. 12 shows brake off in standard mode
It shows the state of being performed.

When the standard mode is displaced to the small mode, the main cam 14 rotates clockwise from the state shown in FIGS. 11 and 12. Accordingly, the protrusion 70c- of the small cam gear 70
_{1, 70c- 2} is disengaged from the large diameter portion @ 14 _C-1 of the sliding gear 14c, also the gear portion 70b of the small cam gear 70 is notch 1
4b- _{1 is} disengaged and the gear portions 14b and 70b mesh with each other, so that the rotation of the main cam 14 is transmitted to the small cam gear 70. Therefore, the elevating shaft 22 rotates via the worm wheel 74, the small chassis drive mechanism 11 is driven, and the small chassis 20 starts to move upward (see FIGS. 5 and 8). On the other hand, the cam pin 56 enters the small diameter portion 14a- ₂ of the groove cam 14a by the clockwise rotation of the main cam 14, and the brake is turned on. In this way, when the small chassis 20 moves up and down, the brakes act on the reel disks 17 and 18 to prevent unnecessary rotation.

As the main cam 14 rotates, the small chassis 20 moves upward. The shape of the cam groove 14a of the main cam 14 is such that when the intermediate gear 23 provided on the small chassis 20 reaches a position immediately before meshing with the drive gear 8 of the small tape cassette 3 and the reel gear portion 18a of the reel disk 18 on the winding side. The other displacement point F of the groove cam 14a is configured to reach the disposition position of the cam pin 56. Therefore, when the intermediate gear 23 meshes with the drive gear 8 and the reel gear portion 18a, the cam pin 56 is in the large diameter portion 14a- ₁ of the cam groove 14a, and the brakes of the brake devices 51 and 52 are turned off. Therefore, even when the teeth of the intermediate gear 23 come into contact with the teeth of the drive gear 8 and the teeth of the reel gear portion 18a at the time of meshing, the respective gears 8, 18a, 23 are freely rotatable and accordingly rotate slightly. A smooth mesh can be achieved.

The state changed to the small size mode is shown in FIGS. 9, 13 and 14. The small chassis drive mechanism 11 is configured to complete the upward movement of the small chassis 20 when the main cam 14 rotates 360 ° and enter the small mode. The small cam gear 70 that projections 70C- ₁ even in a state where the main cam 14 is rotated 360 °, 70c- ₂ is configured to the large diameter portion @ 14 _C-1 and the engagement of the sliding cam 14c. Therefore,
In the small mode, the main cam 14 and the reel brake drive mechanism 12 are in the same state as in the standard mode. In this state, the protrusions 70c- ₁ and 70c
- ₂ has rotation of the small cam gear 70 by the large diameter portion @ 14 _C-1 and the engagement of the sliding cam 14c is restricted, thus the small chassis 20 is stopped at the upward position. Further, by rotating the main cam 14 while maintaining the rotation of the small cam gear 70 in a regulated state, the cam pin 56 moves between the large diameter portion 14a- ₁ and the small diameter portion 14a- _{2 about} the displacement point F of the groove cam 14a. Is relatively displaced, the brakes 51, 52 can be freely turned on and off in the small mode. FIG. 14 shows a state in which the brake is turned off in the small mode.

By configuring the main cam 14, the small cam gear 70, and the mechanisms 11 and 12 as described above, the brake ON and the brake OFF can be performed using the same cam groove 14a in both the standard mode and the small mode. As a result, the shape of the main cam 14 can be reduced, and it is not necessary to provide a configuration for driving the brake devices 51 and 52 for each mode, so that the device 1 can be downsized and the structure can be simplified. Also, the small chassis drive mechanism 11 and the reel brake drive mechanism 12 are one main cam 1
Since it is driven collectively by 4, the respective components can be operated at a proper timing by a mechanical sequence.

Note that when the small mode is changed to the standard mode, the configuration of the device 1 performs an operation reverse to the operation when changing from the standard mode to the small mode, and thus the description thereof will be omitted.

EFFECTS OF THE INVENTION As described above, the magnetic recording / reproducing apparatus according to the present invention has the following various features.

(1) Since standard tape cassettes or small tape cassettes can be selectively installed and recording / playback processing can be performed on either tape cassette, there is no need to use an adapter as in the past, and it is easy and easy to operate. Recording and reproducing processing can be performed on both tape cassettes.

(2) Positioning pins for positioning the standard tape cassette are provided on the main chassis, and the relative positions between the positioning pins are uniquely determined. Also, the positioning pins for positioning the small tape cassette are provided on the small chassis that is a frame-like body, and the positioning pins for the small tape cassette are uniquely positioned because they move together as the small chassis moves up and down. It has been decided. Therefore, since both cassettes are positioned at a predetermined position in the magnetic recording / reproducing apparatus with high accuracy, the recording / reproducing process including the loading operation can be smoothly performed.

(3) Positioning of the small chassis with respect to the main chassis
Since a plurality of position regulating portions on the small chassis are brought into contact with the main chassis, the positioning can be performed with high accuracy with a simple structure.

[Brief description of drawings]

FIG. 1 is an enlarged plan view showing an area around a reel of an embodiment of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is a side view of the magnetic recording / reproducing apparatus shown in FIG. 1, and FIG. 3 is a standard view. FIG. 4 is a perspective view of a tape cassette, FIG. 4 is a perspective view of a small tape cassette, FIG. 5 is a configuration diagram of main parts for explaining a small chassis drive mechanism, FIG. 6 is a plan view of a small chassis, and FIG. FIG. 8 is a front view of the chassis, FIG. 8 is a side view of the small chassis drive mechanism in the standard mode, FIG. 9 is a side view of the small chassis drive mechanism in the small mode, and FIG. 11 is a view for explaining a moving mechanism of a lever member for holding the brake, FIG. 11 is a standard mode and the brake is ON.
Fig. 12 is a block diagram of the reel brake drive mechanism in the state of Fig. 12, Fig. 12 is a block diagram of the reel brake drive mechanism in the standard mode and the brake is OFF, and Fig. 13 is the brake mode in the small mode. FIG. 14 is a block diagram of a main part of a reel brake drive mechanism, and FIG.
FIG. 15 is a longitudinal sectional view of the reel disk on the take-up side, FIG. 16 is a sectional view taken along line D-D in FIG. 15, and FIG.
FIG. 7 is a diagram for explaining drive control of the swing idler. DESCRIPTION OF SYMBOLS 1 ... Device, 2 ... Standard tape cassette, 3 ... Small tape cassette, 6a, 6b ... Positioning hole, 6c, 6d ... Positioning contact part, 8 ... Drive gear, 9a, 9b ... Positioning hole,
9c, 9d ... Positioning contact part, 10 ... Main chassis, 10a, 10b ... Opening part, 11 ... Small chassis drive mechanism, 12 ... Reel brake drive mechanism, 13 ... Reel drive mechanism, 14 ... Main cam, 14a ... Groove cam , 14a
_-1 , 14c- ₁ ... Large diameter part, 14a- ₂ , 14c- ₂ ... Small diameter part, 14b ... Gear part, 14c ... Sliding cam, 15 ... Cam motor, 16 ... Reel motor, 17 ... Supply side reel disk, 18 ... Reel side reel discs, 17a, 18a ...
Reel gear part, 19a to 19d ... Positioning pin, 20 ...
Small chassis, 21a to 21d ... Elevating lever, 22 ... Elevating shaft, 23 ... Intermediate gear, 23a ... Small diameter gear part, 23
b ... Large-diameter gear portion, 24a to 24d ... Positioning pin, 25
a to 25d, 26a, 26b ... Position regulating portion, 31, 32
... links, 37a to 37d ... engaging pins, 38, 39 ... torsion springs, 43, 44 ... brake levers, 43a,
43b ... Inclined portion, 51, 52 ... Brake device, 56 ... Cam pin, 58 ... Brake arm, 59 ... Brake shoe, 60 ... Torsion spring, 62 ... Brake pin, 64
... swing idler, 65 ... supply side intermediate gear, 66 ... winding side intermediate gear, 70 ... small cam gear, 70a ... worm,
70b ... Gear part, 70c ... Small cam part, 70c- ₁ , 70
c- ₂ ... Protrusion, 74 ... Worm wheel.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Harumatsu 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Japan Victor Company of Japan, Ltd. (56) References JP 62-279549 (JP, A)

Claims (1)

[Claims] 1. A main chassis provided with a positioning pin for positioning a standard tape cassette and a reel disk fitted into a reel hub hole of the standard tape cassette and driving the same, and a small tape on a chassis body of a frame body. A positioning pin for positioning the cassette, an intermediate gear that meshes with a reel gear portion formed on the reel disc and a drive gear provided on the small tape cassette, and transmits the rotation of the reel disc to the drive gear are provided. At the same time, a small chassis having position regulating portions formed at a plurality of positions on the chassis body, and a small chassis drive mechanism for vertically driving the small chassis with respect to the main chassis are provided. When mounting the cassette, the intermediate gear and the positioning pin provided on the small chassis are attached to the standard cassette. The small chassis drive mechanism moves the small chassis downward to a position where it does not get in the way, and when the small tape cassette is mounted, the small chassis drive mechanism causes the small chassis to come into contact with the main chassis at the position regulating portion. Magnetic recording, characterized in that the small chassis is positioned up to the main chassis by moving up to the main chassis, and the intermediate gear meshes with the reel gear portion of the reel disk as the small chassis moves up. Playback device.