JPH0682480B2 - Magnetic recording / reproducing device - Google Patents

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 configured so that tape cassettes having different sizes can be mounted.
Reproduction device

2. Description of the Related Art In a magnetic recording / reproducing apparatus such as a video tape recorder, when a tape cassette is mounted in the apparatus, a tape loading member fits in the tape cassette, and the tape loading member moves along a guide groove.
The tape in the tape cassette is pulled out and wound around the outer circumference of the rotating drum to perform magnetic recording / reproduction.

Further, the tape cassette mounted on the video tape recorder has, for example, an outer shape and size of a housing, a concave shape into which a tape loading member, a tape tension pole and the like are fitted, a tape reel shape, a supply side and a winding side. The distance between tape reels is standardized. Therefore, in the magnetic recording / reproducing apparatus, a nonstandard tape cassette different from the standard type tape cassette cannot be mounted in the apparatus.

However, a small tape cassette smaller than the standard tape cassette is used for video cameras,
To mount this small tape cassette on a standard tape cassette device, an adapter is separately prepared, and the small tape cassette is mounted via this adapter.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, as described above, in order to mount the small tape cassette to the apparatus for the standard type tape cassette, it is necessary to prepare the above adapter, and further, the small tape cassette is loaded in the adapter. After that, the adapter is mounted on the apparatus, so that the conventional apparatus has a problem that the mounting operation of the small tape cassette is troublesome.

Especially, the standard tape cassette and the small tape cassette have different positions of the tape loading member and the tape tension pole when the tape cassette is mounted, so that the standard tape cassette and the small tape cassette can be directly mounted in one device. It was difficult to do.

Therefore, a tape loading member for winding the tape in the tape cassette around the rotary drum is movably provided at a first unloading position where the tape is inserted into the standard tape cassette or a second unloading position where the tape is inserted into the small tape cassette. Thus, it has been considered that a standard type tape cassette and a small size tape cassette can be mounted in one device.

However, an optical sensor that optically detects the tape end when the tape is wound is provided in the apparatus, and a light emitting element such as a light emitting diode that is fitted in the tape cassette is provided on the chassis. Therefore, in a device that allows tape cassettes of different sizes and shapes to be mounted, it is desired that the light emitting element be positioned so as not to interfere with the mounting operation of the standard tape cassette and the small tape cassette. There is.

Therefore, an object of the present invention is to provide a magnetic recording / reproducing apparatus which meets the above-mentioned demand.

Means and Actions for Solving Problems The present invention is a magnetic recording / reproducing apparatus in which a plurality of types of tape cassettes having different sizes are selectively mounted, and a tape end detection sensor is used when the tape cassette is mounted. A light-emitting element that emits detection light is provided so as to be displaced to a position that fits into each tape cassette according to the type of the tape cassette that is mounted in the apparatus.
Since the light emitting element is displaced to the original position regardless of the type of the tape cassette, the light emitting element for detecting the end of the tape hinders the selective mounting operation of the tape cassette having the different size and shape. In addition, since the light emitting element is always in the same position when the tape is running, a stable amount of light is always incident on the light receiving element regardless of the type of tape cassette, so the end of the tape can be detected reliably. Is.

Embodiment FIG. 1 and FIG. 2 show an embodiment of the magnetic recording / reproducing apparatus according to the present invention.

In both figures, the magnetic recording / reproducing apparatus 1 directly mounts the standard type tape cassette 2 (shown by the one-dot chain line in FIG. 1) or the small tape cassette 3 (shown in FIGS. 4A and 4B). It is configured to be able to.

Before describing the configuration of the apparatus 1, the standard tape cassette 2 and the small tape cassette 3 will be described first.

The standard tape cassette 2 has a housing 2a as shown in FIG.
A lid that has a supply-side reel and a take-up-side reel (both not shown) inside and protects the front tape path 2b on the front surface of the housing 2a.
2c is provided. Further, a hub hole 2d of the supply reel, a hub hole 2e of the take-up reel, and a hole 2f into which the light emitting element 35 for detecting the tape end is fitted are opened at the bottom of the housing 2a. Further, on the front side of the bottom of the housing 2a, a loading side loading member described later.
A recess 2g into which the guide roller 10b, the inclined pole 10c and the tension pole 13a of 10 are fitted, a guide roller 11b of the loading member 11 on the winding side, an inclined pole 11c, and
A half loading pole 25 and a recess 2h into which the guide pole 23 is fitted are formed.

Further, holes 2i through which light from a light emitting element 35 for detecting a tape end described later passes are formed on both sides of the housing 2a.

As shown in FIGS. 4A and 4B, the small tape cassette 3 has a lid 3b on the front surface of a housing 3a, and a hub hole 3c of a take-up reel (not shown) at the bottom. It is open. Again housing
A part of a gear 3d integrally provided with a take-up reel (not shown) is exposed on the bottom and side surfaces of 3a.

Further, on the front side of the bottom surface of the small tape cassette 3, a concave portion 3f into which a supply-side guide roller 10b, an inclined pole 10c, and a tension pole 13a described later are fitted, a winding-side guide roller 11b, an inclined pole 11c, and half-loading described later The recess 3g into which the pole 25 is fitted, the guide pole 23 and the light emitting element
A recess 3h into which 35 is fitted is formed.

As described above, the standard tape cassette 2 and the small tape cassette 3 differ not only in their size and appearance, but also in the separation distance between the supply-side reel and the take-up reel, and the drive of the take-up reel. The methods are also different.

To mount the standard tape cassette 2 and the small tape cassette 3 in the same device 1, as shown by the broken line in FIG. 4C, the hub hole 2d on the supply side of the standard tape cassette 2 is provided. And the hub hole 3c of the small tape cassette 3 are aligned with each other.

As a result, the recesses 3f, 3g, 3h of the small tape cassette 3 are located on the inner side of the tape cassette than the recesses 2g, 2h of the standard type tape cassette 2.

Next, a schematic configuration of the device 1 will be described.

As shown in FIG. 1, a drum base 5 is mounted and fixed on the chassis 4, and a rotary drum 6 having a magnetic head (not shown) is provided on the drum base 5. Further, arcuate guide grooves 7 and 8 are formed in the chassis 4 on both the left and right sides of the rotary drum 6.

The guide grooves 7 and 8 correspond to the mounting position of the standard type tape cassette 2 shown in FIG. 3 and the mounting position of the small tape cassette 3 shown in FIG. 4, and are extended toward the tape cassette side as compared with the conventional device. There is. The guide groove 8 on the tape winding side (right side) is formed longer than the guide groove 7 on the tape supply side (left side).

Reference numerals 10 and 11 denote tape loading members, and loading bases 10a and 11a provided so that pins (not shown) on the bottom side are fitted into the guide grooves 7 and 8 so as to be movable along the guide grooves 7 and 8.
Guide roller 1 that stands upright from the loading bases 10a and 11a
0b and 11c, and inclined poles 10c and 11c that incline and project from the loading bases 10a and 11a. The tape loading members 10 and 11 are the loading drive mechanism 9 described later.
When the standard type tape cassette 2 is loaded, the standard tape cassette 2 is moved to the first unloading position (shown in FIG. 1) where the standard type tape cassette 2 is loaded, and when the small tape cassette 3 is loaded. Moves to a second unloading position (shown in FIG. 5 (A)) in which the small tape cassette 3 is fitted.

Further, the drum base 5 is provided with V-shaped stoppers 5a and 5b projecting above the guide grooves 7 and 8, and the tape loading members 10 and 11 are provided along the guide grooves 7 and 8 as described later. When it moves in the directions of arrows A and B (shown in FIG. 1), it abuts stoppers 5a and 5b and stops at the tape loading completion position.

A leaf spring 12 protruding in the traveling direction is attached to the loading base 10a of the tape loading member 10 on the tape supply side.

Reference numeral 13 is a tension arm, which has a tension pole 13a standing upright at its tip and is supported by a shaft 4a on the chassis 4. Further, the arm portion 13b of the tension arm 13 is hooked at the other end of a coil spring 14 (shown by a broken line in FIG. 1) whose one end is hooked to the chassis 4, and the tension arm 13 is It is urged to rotate counterclockwise by a pulling force. Therefore, the tension arm 13 comes into contact with the loading base 10a and rotates following the movement of the loading base 10a when the tape loading member 10 on the supply side is within its rotation range.

A toggle member 15 formed by connecting links 15a and 15b in a V shape is rotatably connected to the middle of the tension arm 13, and one end of a brake band 16 is locked to the toggle member 15. ing. The other end of the brake band 16 is locked by a fixing member 17 fixed to the chassis 4 and faces the outer circumference of the reel stand 18a on the supply side.

As shown in FIG. 1, the toggle member 15 is displaced in a V shape, but is not displaced in the opposite direction. Therefore,
When the loading member 10 is in the first and second unloading positions as shown in FIG. 1 and FIG. 5 (A), the toggle member 15 is displaced in a dogleg shape to eliminate the extra slack of the brake band 16. Absorbing. Therefore, the brake band 16 does not sag significantly and is separated from the reel base 18a.

Reference numeral 19 denotes a full-width erasing head, which is mounted and fixed on the erase base 20. The erase base 20 is rotatably supported by a shaft 20a, and an impedance roller 21 and a guide pole 22 are provided on the upper surface thereof.

Reference numeral 23 is a guide pole that stands upright at the tip of the guide arm 24. Reference numeral 25 is a half loading pole that stands upright from the tip of the half loading arm 26. It should be noted that the guide pole 23 and the half loading pole 25 are driven by a pole moving mechanism 27, which will be described later, with arms 24 and 26 being inserted into the standard tape cassette 2 according to the type of tape cassette to be mounted. Position (shown in Figure 1)
Alternatively, the tape is moved to the second unloading (shown in FIG. 5) fitted in the small tape cassette 3.

28 is a guard pole that prevents the tape from slidingly contacting the rotating drum 6 during half loading, and a guide pole arm
Standing up from the tip of 29.

The guide pole 23 and half loading pole
25 and guard pole 28 are displaced according to each mode,
Details will be described later.

A capstan 30 is rotationally driven counterclockwise by a capstan motor 30a (shown by a broken line in FIG. 1) arranged on the lower surface side of the chassis 4. 31 is a pinch roller, which is rotatably supported by the tip of an arc-shaped pinch roller arm 32, and rotates upward and downward in the recording / reproducing pin roller arm 32 and a base 33 that supports the pinch roller arm 32. It is crimped to the capstan 30 by a horizontal rotating operation.

Details of the pinch roller driving mechanism 34 for operating the pinch roller 31 will be described later.

Reference numeral 35 is a light emitting element for detecting the end of the tape, which is composed of a light emitting diode, for example.
Is provided on a pole 36a which stands upright from the tip of the. The arm 36 is urged to rotate counterclockwise by the pulling force of the coil spring 37. The normal arm 36 abuts on the pin 4c protruding from the chassis 4 so that the standard tape cassette 2 has a hole.
It is in a first position (shown in FIG. 1) opposite 2f.

Further, when the small tape cassette 3 is mounted, the arm 36 is pressed by the arm 24 that rotates counterclockwise, and the light emitting element 35
Is a second position (fifth position) in which the small tape cassette 3 is fitted.
(Shown in the figure).

As shown in FIG. 1, tape end detecting sensors 81 and 82 for receiving light from the optical element 35 are provided on both sides of the mounting position of the standard type tape cassette 2. A transparent leader tape (not shown) is provided at the tape end on the supply side of the tape wound in the standard tape cassette 2 and the small tape cassette 3, and a transparent trailer at the tape end on the winding side. A tape (not shown) is provided.

Normally, the light from the light emitting element 35 does not pass through the sensor 81, 8 because the light does not pass through the tape in the part where the magnetic film is formed.
Does not reach 2.

However, for example, when the tape is taken up on the take-up reel,
When the trailer tape reaches between the light emitting element 35 and the sensor 81, the light from the light emitting element 35 passes through the trailer tape, so that the sensor 81 receives the light from the light emitting element 35. As a result, the sensor 81 outputs a trailer tape detection signal, and the control circuit (not shown) receives this signal and the take-up reel stand 18
Stop the rotation of b.

When the tape is rewound on the supply reel and the leader tape reaches between the light emitting element 35 and the sensor 82, the light from the light emitting element 35 passes through the leader tape and is incident on the sensor 82.
Therefore, the sensor 82 outputs a leader tape detection signal,
The control circuit stops the rotation of the supply-side reel stand 18a.

The schematic configuration of the magnetic recording / reproducing apparatus 1 has been described above. Next, the mechanism for operating each member will be described in detail.

"Loading drive mechanism" As shown in FIG.
Is transmitted to the worm gear 43 via a pulley 40, a gear 41 integral with the pulley 40, and a gear 42 meshing with the gear 41.
Then, the main cam gear 44 that meshes with the worm gear 43 in the horizontal direction and the sub cam gear 45 that meshes with the worm gear 43 in the vertical direction rotate.

As shown in FIG. 6, the rotation of the main cam gear 44 is transmitted to the ring gear mechanism 50 that drives the loading members 10 and 11 via the main gear 44 ′ integrated with the main cam gear 44 and gears 46, 47, 48 and 49.

The ring gear mechanism 50 is arranged below the rotary drum 6, and has a ring gear 50a that meshes with the gear 49, and ring gears 50b and 50c arranged above the ring gear 50a.

Each ring gear 50a, 50b, 50c is coaxially and rotatably supported by three rollers 51a, 51b, 51c which are in sliding contact with the inner peripheral side.

Further, as shown in FIGS. 5 (A) and 7 (A), the base 10a of the tape loading member 10 on the supply side is the connecting member 55.
It is connected to the ring gear 50a via. One end of the connecting member 55 is connected to a sliding member 57 that is biased in the direction of arrow c by the tensile force of a coil spring 56 slidably provided on the ring gear 50a.

Further, as shown in FIGS. 5 (A) and 7 (C), the base 11a of the tape loading member 11 on the winding side is connected to the connecting member 5.
It is connected to the ring gear 50c via 8. Connecting member 58
Is connected to a sliding member 59 slidably provided on the ring gear 50c, and the sliding member 59 is biased in the direction of arrow D by the tensile force of the coil spring 60.

Therefore, the loading members 10 and 11 move along the guide grooves 7 and 8 as the ring gears 50a and 50b and 50c rotate.

The rotation of the ring gear 50a is caused by the rotation of the gear 52 and the gear 53 that meshes with the gear 52.
It is transmitted to the ring gear 50b via a gear 53b that is integral with the gear 53a. Further, the rotation of the ring gear 50a is transmitted to the ring gear 50c via the gear 52, a small diameter gear 54a meshing with the gear 52, and a gear 54b integral with the gear 54a. It should be noted that FIGS. 7 (A), (B), ( as shown in C), the gear portion 50a ₁ that meshes with the gear 49 is formed in a range of angle α on the outer periphery of the ring gear 50a. Further, a gear portion 50b ₁ that meshes with the gear 53b is formed in the range of the angle β on the outer periphery of the ring gear 50b. Also, on the outer circumference of the ring gear 50c, the gear 54b
The gear portion 50c ₁ that meshes with is formed in the range of the angle γ.

The ring gears 50b and 50c are stacked and integrally connected as shown in FIG. 5 (B). In addition, ring gear 50b
And 50c are stacked as they are in the state shown in FIGS. 7 (B) and (C), so that a part of the gear parts 50b ₁ and 50c ₁ overlap each other, and each gear part 50b ₁ The teeth and the teeth of 50c ₁ are integrated by matching the pitch.

Since the ring gear 50a is driven by the gear 49, the loading member 10 rotates at a constant speed from the unloading position to the loading completion position. However,
As will be described later, the ring gears 50b and 50c are driven at a constant speed through the gears 53a and 53b (reduction ratio = 1) until the loading member 11 reaches the half-loading position from the half-loading position. Gears 54a, 54b (reduction ratio <1) up to the completed position
It is increased or decreased through the drive.

In this way, the ring gears 50b, 50c for moving the tape loading member 11 on the winding side are accelerated and moved from the half loading position as shown in FIG. This is because the guide groove 8 has a longer overall length so that the tape loading members 10 and 11 reach the loading completion position substantially at the same time.

The tape loading members 10 and 11 are the ring gears 50a and 5 described above.
By rotating 0b and 50c, the tape is moved from the first or second unloading position to the half loading position and the loading completion position, and the tape in the tape cassettes 2 and 3 is pulled out to wind the tape around the rotary drum 6. . or,
By the reverse rotation of the ring gears 50a, 50b, 50c, the tape is returned into the tape cassettes 2, 3 by returning from the loading completion position to the first or second unloading position.

"Pole moving mechanism" As shown in Figs. 1 and 2, the lower surface side of the main cam gear 44 meshing with the worm gear 43 is shown in Figs. 8 (A) to (D).
The cam grooves 44a and 44b shown in are formed.

On one of the cam grooves 44a fitted pin 61a of the slide lever 61 provided slidably in the arrow X _1, X ₂ direction, the pin 62a of the swing arm 62 is fitted to the other of the cam groove 44b .

The slide lever 61 is connected to the fan gear 63 via a pin 61b that stands upright from the other end of the slide lever 61 and a leaf spring 63a that holds the pin 61b. The fan-shaped gear 63 is the chassis 4
It is rotatably supported by the upper pin 4d.

Therefore, when the cam gear 44 rotates counterclockwise, the cam groove
The slide lever 61 slides in the direction of the arrow X ₁ in accordance with the rotation position of 44b, and the sector gear 63 rotates in the clockwise direction accordingly. Further, the rotation of the fan-shaped gear 63 is transmitted to the gear 24a of the arm 24 via the gear 64 as shown in FIG. As a result, the arm 24 rotates clockwise, and the guide pole 23 provided at the tip of the arm 24 changes to each mode as the main cam gear 44 rotates as shown in the cam diagram of FIG. 9 (a). It is displaced to the corresponding position.

The rotation of the fan-shaped gear 63 is performed by the gear 65a meshing with the gear 64,
It is transmitted to the gear 26a of the arm 26 having the half loading pole 25 via the small diameter gear 65b integrated with the gear 65a and the gear 66 meshing with the small diameter 65b. Therefore, the arm 26 rotates in accordance with the rotational position of the cam groove 44b, and the half loading pole 25 responds to each mode as the main cam gear 44 rotates as shown in the cam diagram of FIG. 9 (a). Displace to position.

The swing arm 62 is connected to a pin 67a of a swing gear 67 via a leaf spring 62b. The swing gear 67 is rotatably supported by the pin 4e and meshes with the gear 68. The swing gear 67 is urged to rotate counterclockwise by the pulling force of the coil spring 69.

Therefore, as the cam gear 44 rotates clockwise, the swing arm 62 that engages with the cam groove 44a rotates counterclockwise. Swing gear with rotation of swing arm 62
67 rotates clockwise, and the rotation is transmitted to the gear 29a of the arm 29 having the guard pole 28 via the gear 68.
Therefore, the arm 29 rotates in accordance with the rotational position of the cam groove 44a, and the guard pole 28, as shown in the cam diagram of FIG. 9 (b), moves in accordance with each mode as the main cam gear 44 rotates. Is displaced to.

[Pinch roller drive mechanism] As shown in FIG. 1, a pinch roller arm 32 having a pinch roller 31 at its tip is supported by a shaft 33a supported by a base 33, and a torsion spring wound around the shaft 33a (see FIG. It is urged to rotate upward by the elastic force of (not shown). Therefore, the arm 32 is rotated so that the pinch roller 31 moves upward. The base 33 is rotatably supported on the chassis 4.

As shown in FIG. 10, on the upper surface of the main cam gear 44, a cam groove 44c for rotating the pinch roller and a cam groove 44d for pressing the pinch roller are provided. This cam groove 44c has arrows Y ₁ , Y ₂
A pin 70a of a slide lever 70 that is slidable in the direction is inserted. Further, one end of a rotating member 71 rotatably supported in an intermediate portion is connected to the slide lever 70, and the other end of the rotating member 71 slides in the directions of the arrows Y ₁ and Y _2. It is connected to the rack 72.

The slide rack 72 has a rack 72a that meshes with the gear 33b of the base 33.

The pin 73a of the arm 73 is engaged with the cam groove 44d for pressing the pinch roller, and the arm 73 is connected to the two plates 74 and 75 supported by the pin 4f. The two plates 74 and 75 are integrated by the tensile force of the coil spring 76.

Further, when the pinch roller arm 32 is rotated, the plate 75 has a protruding pin 32a (shown in FIG. 2) in the middle of the arm 32.
Is provided with a bent portion 75a. This bent portion 75a presses the pin 32a of the pinch roller arm 32 via the spring force of the recording / reproducing spring 76 as described later, and the pinch roller 31
Crimp onto the capstan 30.

The sub-cam gear 45 that meshes with the worm gear 43 in the vertical direction has a cam groove 45a as shown in FIG. A pin 77a of an up-down arm 77 is engaged with the cam groove 45a, and the up-down arm 77 is rotatably supported by a bracket 78. A roller 77b is provided at the end of the up / down arm 77.

The pinch roller arm 32 is urged to rotate so that the contact portion 32b at the end thereof contacts the roller 77b of the up-down arm 77. Therefore, when the sub cam gear 45 rotates counterclockwise and the pin 77a is displaced inward, the up-down arm 77 rotates counterclockwise. Then, the pinch roller arm 32 is rotated by pressing the contact portion 32b upward by the roller 77a of the up-down arm 77, and lowers the pinch roller 31.

As shown in FIGS. 1 and 2, the front surface of the cam gear 45
A reflection pattern (not shown) is formed on 45b to detect the rotation angle for each mode. Also, cam gear 45
The three optical sensors 79 are provided at positions facing the front surface 45b of the cam gear 45, and the rotational position of the cam gear 45 is detected by the combination of the detection signals obtained from the three optical sensors 79. Since the main cam gear 44 and the cam gear 45 have the same diameter, the rotation position of the main cam gear 44 can also be detected from the detection signal of the optical sensor 79.

[Tension Arm, Erase Base Operation Mechanism] The tension arm 13 is pressed against the loading side loading base 10a by the tension force of the spring 14 as shown in FIGS. The loading position (the position where the tension pole 13a is fitted into the recess 2g of the standard tape cassette 2) or the second
To the unloading position (the position where the tension pole 13a is fitted into the concave portion 3f of the small tape cassette 3).

Therefore, the tension arm 13 is attached to the loading base 10a.
It moves in the direction of arrow A and rotates counterclockwise by the spring force of the spring 14.

As shown in FIG. 12, when the loading base 10a further moves in the direction of arrow A, the leaf spring 12 which is separated from the tension arm 13 but extends in the traveling direction is a sliding surface 20b below the erase base 20 (see FIG. 12). (Indicated by the broken line) while sliding.

Therefore, the erase base 20 rotates counterclockwise around the shaft 20a, and the end portion 20c thereof is brought into contact with the tension arm 13. Therefore, the tension arm 13 is the erase base.
It is pressed against the end 20c of 20.

Further, when the loading base 10a moves in the direction of arrow A and reaches the loading completion position, the loading base 10a passes through the erase base 20, so that the erase base 20 rotates clockwise and returns to the original position. As will be described later, the tension arm 13 further rotates counterclockwise from the position shown in FIG. 12 to fit the tension pole 13a into the recess 20d of the erase base 20. As a result, the tension arm 13 reaches a position where a tape path is formed during recording / reproduction, and the toggle member 15 is linearly extended to slide the brake band 16 onto the reel table 18a on the supply side.

Further, when returning from the loading completion state to the unloading position, the loading base 10a operates in the opposite manner to the above, and when the loading base 10a returns, the leaf spring 12 of the loading base 10a moves to the erase base 20a. Press the sliding surface 20b. At that time, the erase base 20 rotates counterclockwise and kicks the tension arm 13 at the end 20c. As a result, the tension arm 13
Rotates clockwise to disengage the tension pole 13a from the recess 20d.

(1) Next, the operation of each mode when the standard tape cassette 2 is mounted in the magnetic recording / reproducing apparatus having the above-mentioned configuration will be described.

As shown in FIG. 1, the standard tape cassette 2 (in FIG. 1,
The type of cassette is detected by a cassette detection switch (not shown) when the device (shown by the one-dot chain line) is mounted in the apparatus. Then, the motor 38 is rotated by a command from a control circuit (not shown), and the worm gear 43 is rotated as described above.

The main cam gear 44 is driven by the worm gear 43 to
It rotates 90 degrees clockwise as shown in FIG.

The rotation of the main cam gear 44 is transmitted to the ring gear mechanism 50 as described in the above "loading drive mechanism". As a result, the ring gear 50a rotates clockwise and the ring gears 50b and 50c rotate counterclockwise. Then, the loading members 10 and 11 reach the first loading position shown in FIG.

Further, as explained in the above-mentioned "Pole moving mechanism", the pole moving mechanism 27 operates together with the rotation of the main cam gear 44 to rotate the arms 24 and 26 to the first unloading position shown in FIG. Further, the tension arm 13 follows the loading member 10 and rotates to the first unloading position.

The light emitting element 35 is in the first position where the arm 36 contacts the stopper 4c by the spring force of the spring 37.

Therefore, when the standard tape cassette 2 descends to the predetermined mounting position in the apparatus, the guide poles 1 of the loading members 10 and 11 are
0b, 11b, inclined poles 10c, 11c, and tension pole 13
a, the guide pole 23, and the half loading pole 25 are fitted into the recesses 2g and 2h of the standard type tape cassette 2 shown in FIG. Further, the upper portions of the reel stands 18a, 18b are fitted into the hub holes 2d, 2e of the standard type tape cassette 2, and the light emitting element 3
5 is fitted in the hole 2f.

Next, as shown in FIG. 8C, the main cam gear 44 is further rotated clockwise by the rotation of the motor 38. Therefore, the ring gears 50a, 50b, 50c are further rotated, the tape loading members 10, 11 are separated from the recesses 2g, 2h of the standard type tape cassette 2 by a slight distance, and the half loading position (shown in FIG. 13). ) Move to. .
Further, the tension arm 13 follows the tape loading member 10 and separates from the recess 2g.

Further, the guide pole 23 and the half loading pole 25 fitted in the recess 2h are provided in the cam groove 44 of the main cam gear 44.
As the slide lever 61 engaged with b slides in the direction of the arrow X ₁ , it is displaced to the position shown in FIG. 13 together with the arms 24 and 26 which rotate clockwise.

Therefore, the tape 80 pulled out from the standard type tape cassette 2 is inside the tape cassette 2 via the guide pole 10b, the guard pole 28, the half loading pole 25, and the guide pole 23 as shown by the chain double-dashed line (in FIG. 13). A tape path is formed to return to. The tape 80 is a guard pole
Since 28 is not displaced yet and is positioned in front of the rotary drum 6, it passes a position separated from the outer periphery of the guide drum 6. Note that the pinch roller 31 is still moving upward during half loading.

Further, as shown in FIG. 8 (C), since the pin 62a of the swing arm 62 which engages with the cam groove 44a is located in the wide portion 44a ₁ during the half loading, the swing arm 62 rotates slightly clockwise. It is movable. Therefore, the spring force of the spring 69 that biases the swing gear 67 causes the guard pole 28
It is possible to bias the arm 29 having the rotation counterclockwise, thereby applying tension to the tape 80.

Here, the recording or reproduction mode operation is performed. This record /
By the reproduction mode operation, the motor 38 is further rotated, and the main cam gear 44 is rotated clockwise as shown in FIG. 8 (D).

The rotation of the main cam gear 44 causes the pin 62a of the swing arm 62 that engages with the cam groove 44a to be displaced toward the inner peripheral side, so that the swing arm 62 rotates counterclockwise. Therefore, the arm 29 having the guard pole 28 pivots largely clockwise as shown in FIG. 14 to avoid the position where the movement of the loading member 11 is not hindered.

By rotating the main gear 44 'integrated with the main cam gear 44 in the same direction, the ring gear 50a further rotates clockwise and the ring gears 50b and 50c rotate counterclockwise. At that time, so that the gear portion 50c ₁ and the gear 54b of the ring gear 50c with the disengagement of the gear portion 50b and the gear 53b of the gear portion of the ring gear 50b as described above is engaged. Therefore, the loading-side loading member 10 has the guide groove 7
The loading member 11 on the winding side is further accelerated and moves in the direction of the arrow B along the guide groove 8.

Therefore, as shown in FIG. 14, the loading members 10 and 11 are
Each of the tapes 80 is wound around the outer circumference of the rotary drum 6 and is brought into contact with the stoppers 5a and 5b substantially at the same time.

The loading bases 10a and 11b contacting the stoppers 5a and 5b are pressed and held by the stoppers 5a and 5b by the spring force of the coil springs 56 and 60 provided on the ring gears 50a and 50c, respectively.

The loading side loading member 10 moves to the loading completion position shown in FIG. 14, and the tension arm 13 rotates counterclockwise following the loading member 10 as described above, causing the tension pole 13a to move to the impedance roller 2.
Displace between 1 and the guide pole 22.

Therefore, the links 15a and 15b of the toggle member 15 connected in the middle of the tension arm 13 are linear. Therefore, the tension arm 13 slides the brake band 16 on the outer circumference of the reel base 18 on the supply side via the toggle member 15 to apply back tension to the tape 80.

Further, as the main cam gear 44 rotates, the sub cam gear 45 (shown in FIG. 11) meshing with the worm gear 43 also rotates counterclockwise. Therefore, as described above, after the tape loading member 11 moves in the direction of the arrow B along the guide groove 8 and passes below the pinch roller 31, FIG.
The up-down arm 77 rotates counterclockwise along the cam groove 45a of the sub-cam gear 45 as shown in the cam diagram of FIG.
Therefore, the contact portion 32b of the pinch roller arm 32 is pressed by the roller 77b of the up / down arm 77 and moves upward.
Therefore, the pinch roller arm 32 rotates about the shaft 33a as a fulcrum to lower the pinch roller 31.

In addition, the cam grooves 44c and 44d on the upper surface side of the main cam gear 44 also have the tenth position.
For rotating clockwise as shown in FIG. (B), the pin 70a of the slide lever 70 is displaced to the inner circumferential side along the cam groove 44c, the slide lever 70 is displaced in the arrow Y ₂ direction.

Further, since the pin 73a of the arm 73 is displaced in the outer peripheral direction along the cam groove 44d, the arm 73 is rotated clockwise.

Therefore, as shown in FIG. 9 (C), after the pinch roller 31 is lowered, the slide lever 70 slides in the arrow Y ₂ direction, and this displacement is transmitted to the slide rack 72 via the rotating member 71. . That is, the slide rack 72 slides in the arrow Y ₁ direction.

Therefore, the base 33 that meshes with the rack 72a of the slide rack 72 rotates counterclockwise, and the tape 80 is brought into contact with the capstan 30 by the pinch roller 31. Thereafter, as shown in FIG. 9 (D), the arm 73 rotates clockwise, whereby the pair of plates 74 and 75 rotate counterclockwise. As a result, the bent portion 75a of the plate 75 contacts the projecting pin 32a of the pinch roller arm 32, and the arm 32 is biased counterclockwise by the spring force of the spring 76.

In this way, the tape 80 travels to the winding side and is recorded or reproduced while being pressed against the capstan 30 side by the pinch roller 31.

At that time, when the tape 80 is wound on the winding reel, the light from the light emitting element 35 passes through the trailer tape and enters the tape end detection sensor 81 as described above. Tape edge detection sensor
Reference numeral 81 receives light from the light emitting element and outputs a trailer tape detection signal.

The unloading operation is the reverse of the above loading operation.

(2) Next, the case of mounting the small tape cassette 3 will be described.

As shown in FIG. 5 (A), the small tape cassette 3 (5th
When the device is attached to the device (indicated by a chain double-dashed line in the drawing) in the apparatus, a cassette detection switch (not shown) detects that the tape cassette is a small tape cassette. Then, the motor 38 reversely rotates the worm gear 32 to rotate the main cam gear 44 to the position shown in FIG. 8 (A) in response to a command from a control circuit (not shown).

Due to the reverse rotation of the worm gear 32, the ring gear 50c of the ring gear mechanism 50 rotates clockwise, and the other ring gears 50b, 5b
0c rotates counterclockwise. Therefore, the loading members 10 and 11 move to the small tape cassette 3 side from the first unloading position shown in FIG.

The tension arm 13 rotates clockwise along with the movement of the loading-side loading base 10a to reach the second unloading position shown in FIG. 5 (A). Further, the rotation of the cam groove 44b on the lower surface side of the main cam gear 44 causes the slide lever 61 engaged with the cam groove 44b to slide in the arrow X ₂ direction.

Therefore, the above-mentioned pole moving mechanism 27 operates, and the guide pole 23, the arm 24 having the half loading pole 25,
26 rotates counterclockwise as shown in FIG. Therefore, the guide pole 23 and the half loading pole 25 are displaced from the first unloading position shown in FIG. 1 to the second unloading position corresponding to the small tape cassette 3.

Therefore, when the small tape cassette 3 descends to the predetermined mounting position in the apparatus, the guide poles 1 of the loading members 10 and 11 are
0b, 11b, inclined poles 10c, 11c, tension pole 13a, guide pole 23, and half loading pole 25 are concave portions 3f, 3 of the small cassette tape 3 shown in FIGS. 4 (A) and (B).
Insert into g, 3h.

Further, when the arm 24 rotates counterclockwise, the arm 36 having the light emitting element 35 rotates clockwise against the spring force of the spring 37. Therefore, the light emitting element 35 is also the guide pole 23.
At the same time, it is fitted into the recess 3h of the small tape cassette 3.
Therefore, when the small tape cassette 3 descends, the light emitting element
35 is out of the way.

Further, the small tape cassette 3 is lowered to the mounting position, and the reel stand 18a on the supply side is fitted into the hub hole 3c. Further, a drive gear (not shown) arranged under the chassis 4
Moves upward, and this drive gear meshes with the gear 3d on the winding side.
Therefore, the reel on the winding side is driven by this drive gear to wind the tape.

Next, when the small tape cassette 3 is mounted at the predetermined mounting position, the motor 38 rotates in the same manner as when the standard tape cassette 2 is mounted, and the half loading state shown in FIG. 13 is obtained. At this time, since the arms 24 and 26 rotate clockwise, the arm 36 having the light emitting element 35 returns to the original tape end detection position (second position) by the spring force of the spring 37.

Therefore, as described above, the tape end detection sensors 81 and 82 output a signal for detecting the tape end when the trailer tape or the leader tape reaches the light emitting element 35.

Furthermore, by operating the recording / playback mode, the same operation as in the standard tape cassette described above is performed,
The state shown in FIG. 14 is obtained. In the fast forward / rewind mode, the half loading state shown in FIG. 13 is set, and the tape is run at high speed without sliding contact with the rotary drum 6 and the capstan 30.

As described above, in the magnetic recording / reproducing apparatus according to the present invention, the light emitting element for detecting the tape end is fitted into the concave portion of the tape cassette according to the size of the tape cassette mounted in the apparatus. Therefore, even if standard tape cassettes or small tape cassettes of different sizes are selectively mounted, the light emitting element does not interfere, and tape cassettes of different sizes can be mounted without trouble. Moreover,
When the light emitting element is displaced according to the rotation of a lever having a pole or the like for guiding the tape path, the light emitting element can be displaced to a position corresponding to a tape cassette having a different size with a relatively simple structure. be able to. In the magnetic recording / reproducing apparatus according to the present invention, the light emitting element is
Regardless of the type of tape cassette, since it is at the same position when the tape is running, a stable amount of light is always incident on the light receiving element, so that the end of the tape can be reliably detected. It has features such as

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a perspective view for explaining a standard type tape cassette, and FIG. FIG. 5 is a perspective view for explaining the tape cassette, FIG. 5 is a view showing a state when a small tape cassette is mounted, FIG. 6 is a plan view showing a ring gear mechanism, FIG. 7 is a plan view of each ring gear, and FIG. The figure shows the cam groove on the lower surface side of the main cam gear, Fig. 9 is a cam diagram, Fig. 10 is the plan view showing the cam groove on the upper surface side of the main cam gear, and Fig. 11 is the rear view of the device from the rear. FIG. 12 is a plan view for explaining the operation of the tension arm, FIG. 13 is a plan view at the time of half loading,
FIG. 14 is a plan view in the recording / reproducing mode. 1 ... Magnetic recording / reproducing device, 2 ... Standard tape cassette, 3 ... Small tape cassette, 6 ... Rotating drum, 7,
8 ... Guide groove, 9 ... Loading drive mechanism, 10, 11 ...
… Tape loading member, 13 …… Tension arm,
13a …… Tension pole, 15 …… Toggle member, 16 ……
Brake band, 19 …… Full width erasing head, 23 …… Guide pole, 25 …… Half loading pole, 28 …… Guard pole, 30 …… Capstan, 31 …… Pinch roller,
32 …… Pinch roller arm, 34 …… Pinch roller drive mechanism, 35 …… Light emitting element, 38 …… Motor, 44 …… Main cam gear, 44a, 44b, 44c, 44d …… Cam groove, 45 …… Sub cam gear, 45a ...... Cam groove, 50 ...... Ring gear mechanism, 50a, 50b, 5
0c …… Ring gear, 61 …… Slide lever, 62 …… Swing arm, 70 …… Slide lever, 71 …… Rotating member,
77 …… Up-down arm, 81,82 …… Tape edge detection sensor.

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

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for selectively mounting a plurality of types of tape cassettes having different sizes, wherein a light emitting element that emits detection light to a tape end detection sensor when the tape cassette is mounted, According to the type of the tape cassette mounted in the device, it is provided so as to be displaced to a position to be fitted into each tape cassette, and when the tape is running, the light emitting element is moved to the original position regardless of the type of the tape cassette. A magnetic recording / reproducing apparatus characterized in that the magnetic recording / reproducing apparatus is configured to be displaced.