JPS5853731Y2 - Tape loading equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape loading device most suitable for application to a magnetic recording/reproducing device such as a VTR.

Conventionally, various devices have been used in tape loading devices for VTRs, but usually a motor dedicated to the loading device is used, and the rotation of the motor in both forward and reverse directions is used to move the tape loading means in the loading and unloading directions. The most common ones are those that are driven by

However, in this case, not only is a dedicated motor for the loading device required, but the motor must also be able to rotate in both forward and reverse directions, and a circuit to control the rotational direction of the motor is also required. The cost is extremely high.

In addition to this, conventionally, for example, a motor for running the tape is used, and while this motor is always rotated in one direction, it is combined with a gear clutch for switching between forward and reverse rotation, and the tape is moved through the gear clutch. There are devices in which the loading means is selectively driven in the loading direction and in the unloading direction.

However, in all cases with conventional devices of this type, the number of gears used is extremely large, and strong force is required to release the gears near the end of tape loading or unloading. Furthermore, even after tape loading is completed, a part of the gear is driven by the motor, and the gear becomes a load on the motor while the tape is running, which causes wow and noise in the tape running. It had defects that caused adverse effects such as flutter.

The present invention was devised in view of the above-mentioned circumstances, and it eliminates the need for a dedicated motor for the tape loading device, requires the least number of gears, has a very simple structure, and allows for easy gear switching. It is an object of the present invention to provide a tape loading device which can be carried out very easily, has no adverse effects such as wow and flutter on tape running, has extremely stable tape running, and can significantly improve recording and playback characteristics. It is something to do.

An embodiment in which the present invention is applied to a tape loading device for a cassette type VTR will be described below with reference to the drawings.

1 is a capstan driving motor used as an example of a tape running motor.

And a pulley 3 fixed to the motor shaft 2 of this motor 1,
A belt 6 is wound around the capstan 4 and a flywheel 5 which also serves as a pulley, and the motor 1 drives the capstan 4 to rotate.

8d is a first gear fixed to the motor shaft 2, and this first gear 8 is always rotationally driven in one direction (the direction of the arrow in FIG. 3) by the motor 1.

9 and 10 are second and third gears, and these gears 9 and 10 are engaged with each other and selectively engaged with the first gear 8.

The second lever 15 has a substantially V-shape, and the gears 9 and 10 are rotatably supported at both ends 12a and 12b of the second lever 15 via shafts 13 and 14, respectively.

15u second lever, one end 1 of this second lever 15
The first louver 12 is rotatably supported on a first fulcrum 16 fixed below 5a.

The other end 15b of the second lever 15 is rotatably supported on a second fulcrum 18 fixed on the base plate 17.

20 is a loading ring used as an example of tape loading means.

As is conventionally known, the tape in the tape cassette is pulled out by the forward rotation of the loading ring 20 (in the direction of the arrow in FIG. 3) and the rotating head drum (none of which is shown)
is loaded into a predetermined state.

Further, the tape is unloaded by the reverse rotation of the loading ring 20 (in the direction of the arrow in FIG. 5).

21 is a fourth gear, and this fourth gear 21 is engaged with a large diameter gear 22 formed on the inner periphery of the loading ring 20 or the like.

A pulley 23 is fixed to the lower end of the third gear 10, and a belt 25 is wound between this pulley 23 and a pulley 24 fixed to the lower end of the fourth gear 21.

Therefore, this fourth gear 21 is rotationally driven by the third gear 10.

Reference numeral 27 denotes a stopper, and this stopper 27 is configured as a downward protrusion integrally formed on the one end 15a side of the second lever 15.

This stopper 271ri is inserted into an arc-shaped elongated hole 28 formed in the first louver 12,
The rotation angle of the second lever 12 with respect to the second lever 15 about the first fulcrum 16 is limited to a predetermined angle by the stopper 27.

Reference numeral 29 denotes a first spring that is suspended between the stopper 27 and an upward protrusion 30 integrally formed on a part of the first louver 12.

The first spring 29 causes the third lever 12 to move around the first fulcrum 16 with respect to the second lever 15.
It is rotated clockwise in the figure.

Due to Namuko's rotational bias, the second gear 9 disposed on the side far from the second fulcrum 18 approaches the first gear 8 side, and the third gear 9 disposed on the side close to the second fulcrum 18 approaches the first gear 8 side.
The gear 10 is moved away from the first gear 8.

However, at this time, the protrusion 30 is connected to one end 1 of the second lever 15.
The rotation angle in the clockwise direction is limited by contact with an adjustment plate 31 attached to 5a.

Reference numeral 32 designates a second spring that is suspended between a projection 33 integrally formed on the other end 15b side of the second lever 15 and a part of the base plate 17.

The second spring 32 urges the second lever 15 to rotate in the counterclockwise direction in FIG. 3 about the second fulcrum 18.

Due to this rotational bias of the button, the second and third gears 9 and 1 are
0 is moved away from the first gear 8.

35 is a lock lever.

The lock lever 35 is rotatably supported on a third fulcrum 36 fixed on the base plate 17, and is located between a protrusion 37 formed integrally with a part of the base plate 17 and a part of the base plate 17. The rack is biased to rotate counterclockwise in FIG. 3 by a third spring 38.

The lock lever 35 is provided with two steps 39 and 40 for locking, and a projection 41 selectively engaged with these steps 3940 is attached to the other end 15b of the second lever 15. The adjustment plate 42 is integrally formed in two parts.

44 is a lock release lever, and this lock release lever 44 is rotatably supported on a fourth fulcrum 45 fixed to the base plate 17, and its tip 44a is connected to the lock lever 35.
is brought into contact with the tip 35a of.

46 is a protrusion for operating the lock release lever 44;
It is fixed under the loading ring 20, and comes into contact with the lock release lever 44 as shown in FIG. 4 near the end of tape loading to operate it.

48 is an eject slide plate used as an example of an unloading start operation means.

The eject slide plate 48 is moved upward as shown in FIG. 4 when an eject button (not shown) is pressed.
And, by locking the eject button, it is locked in its upward movement position.

As the eject slide plate 48 moves upward, its tip 48a presses against the protrusion 49 of the louver 12 as shown in FIG.

Note that due to this suppression, the first lever 12 is rotated counterclockwise in FIG. 4 about the first fulcrum 16 against the second lever 15 against the first spring 29. Power is applied, and subsequently, rotational force is applied to rotate the second lever 15 clockwise in FIG. 5 about the second fulcrum 18 against the second spring 32.

The first and second fulcrums are arranged so that the direction in which the second and third gears 9 and 10 are released from the first gear 8 is in the escape direction with respect to the rotational direction of the first gear 8. 16.18 placement is determined.

That is, the second fulcrum 18 is located at a position relatively far from the motor shaft 2 and the first fulcrum 16, and both gears 8, 9
perpendicular to the base line connecting the centers of the gears 8 and 8.
.

Further, the first fulcrum 16 is located between the two gears 9 and 10,
Moreover, it is disposed at a position opposite to the first gear 8.

The adjusting plate 31 is rotatably fitted to the first fulcrum 16, and is inserted through an arc-shaped elongated hole 53 provided at one end thereof and screwed into the screw hole 54 of the second lever 15. The second lever 15 is fixed by the set screw 55.
installed on.

Therefore, the adjustment plate 31 is configured to be adjustable in angle with respect to the second lever 15 about the first fulcrum 16.

Note that this angle adjustment adjusts the depth of engagement of the second gear 9 with the first gear 8.

Further, the adjustment plate 42 is rotatably fitted to the second fulcrum 18, and is screwed into the screw hole 57 of the second lever 15 by passing through an arc-shaped elongated hole 56 provided in a part of the adjustment plate 42. It is attached to the second lever 15 with a set screw 58 configured as shown in FIG.

Therefore, the adjustment plate 42 is configured to be able to freely adjust its angle with respect to the second lever 15 about the second fulcrum 18.

Note that this angle adjustment adjusts the engagement depth of the third gear 10 with respect to the first gear 8.

Next, the operation of the tape loading device described above will be explained.

First, FIG. 3 shows a state in which a tape loading operation is in progress.

At this time, the second lever 15 is rotated clockwise about the second fulcrum 18 and brought closer to the first gear 8, so that the second gear 9 is engaged with the first gear 8.

The protrusion 41 of the second lever 15 engages the stepped portion 40 of the lock lever 35, and the lock lever 36
The second lever 15 is locked in the engagement position.

As described above, the first gear 8 is always rotated in one direction (the direction of the arrow) by the motor 1 that drives the capstan 4.

The rotational force of the first gear 8 is transmitted to the third gear 10 via the second gear 9, and further transmitted to the fourth gear 21 via the belt 25 etc., so that the fourth gear 21 moves in the direction of the arrow. It is driven in forward rotation.

The loading ring 20 is rotated forward in the direction of the arrow by the fourth gear 21, thereby performing tape loading.

Next, FIG. 4 shows a state in which the tape loading operation has been completed.

As described above, tape loading is performed by rotating the loading ring 20 forward in the direction of the arrow. Immediately before the end of this tape loading operation, the protrusion 46 comes into contact with the lock release lever 44 and pushes it.

Then, the lock release lever 44 is rotated counterclockwise about the fourth fulcrum 45, and its tip 44a pushes the tip 35a of the lock lever 35.

As a result, the lock lever 35 is rotated clockwise against the third spring 3B, the stepped portion 40 is removed from the protrusion 41, and the second lever 15 is unlocked.

At that moment, the second lever 15 is rotated counterclockwise about the second fulcrum 18 by the second spring 32, and as a result, the second gear 9 is separated from the first gear 8.

The button protrusion 41 moves to the stepped portion 39 side of the lock lever 35.

However, at this time, since the disengagement direction A of the second gear 9 from the first gear 8 is in the escape direction with respect to the rotational direction of the first gear 8, the rotation of the motor 1 cannot be stopped. The second gear 9 can be detached from the first gear 8 very easily with an extremely weak force.

Moreover, after the above separation, the tape loading device is moved to motor 1.
The tape loading device does not load the motor 1 at all.

Therefore, the capstan 4 can be rotated extremely stably by the motor 1 without causing uneven rotation of the capstan 4, and bad colors such as wow and flutter can be caused to the tape running. There is no.

Next, FIG. 5 shows a state in which a tape unloading operation is in progress.

At this time, the eject button is first pressed and the eject slide plate 48 is moved upward.

Then, the tip 48a of the eject slide plate 48 comes into contact with the protrusion 49 of the louver 12 and pushes it.

As a result, first the lever 12 is rotated counterclockwise relative to the second lever 15 about the first fulcrum 16 against the first spring 29, and the second gear 9 is moved away from the first gear 8. Meanwhile, the third gear 10 is brought closer to the first gear 8.

When the stopper 27 comes into contact with one end of the elongated hole 28 and the rotation angle of the second lever 12 with respect to the second lever 15 is limited, the second lever 15 is moved to the second position by the subsequent suppression of the eject slide plate 48. It is rotated clockwise about the fulcrum 18 against the second spring 32.

As a result, the second lever 15 is moved closer to the first gear 8, and the third gear 10 is engaged with the first gear 8.

Due to the above engagement, the rotational force of the first gear 8 in the direction of the arrow is directly transmitted to the third gear 10, and the third gear 10 is rotated in the opposite direction to that during the tape loading operation described above.

The rotational force of the third gear 10 is transmitted to the fourth gear 21 via the belt 25 etc.
is driven in reverse rotation in the direction of the arrow.

As a result, the loading ring 20 is driven to rotate in the opposite direction by the fourth gear 21, thereby unloading the tape.

Note that when the second lever 15 is rotated toward the first gear 8, its protrusion 41 moves again to the stepped portion 40 side of the lock lever 35, and the second lever 15 is locked again at that position.

Next, FIG. 6 shows a state in which the tape unloading operation has been completed.

As mentioned above, tape unloading is performed by rotating the loading ring 20 in the opposite direction in the direction of the arrow, but when this tape unloading operation is completed,
When the eject button is unlocked, the eject slide plate 48 is returned downward.

Then, the first lever 12 is rotated clockwise by the first spring 29 about the first fulcrum 16 with respect to the second lever 15 .

At this time, since the second lever 15 is locked by the lock lever 35 at a position close to the first gear 8, following the third gear 10 being disengaged from the first gear 8, the second gear 9 is engaged with the first gear 8.

At this time, the engagement/disengagement direction Bu of the third gear 10 with respect to the first gear 8 is the escape direction with respect to the rotational direction of the first gear 8.

On the other hand, the engagement direction C of the second gear 9 with respect to the first gear 8 is in the biting direction with respect to the rotational direction of the first gear 8.

Further, after the tape unloading operation is completed, the motor 1 is stopped and the tape cassette is ejected.

When the tape cassette is loaded with the above-mentioned tape unloading completed, it is detected and the first gear 8 is again driven to rotate in the direction of the arrow by the motor 1, and the above-mentioned tape loading operation is started. It turns out.

In addition, in order to stop the aforementioned tape unloading operation in the middle and immediately proceed to tape loading, the third gear 10 and the first gear 8 are disengaged without stopping the rotation of the motor 1, and the third gear 10 and the first gear 8 are disengaged. The second gear 9 is engaged with the first gear 8. At this time, in this tape loading device, the engagement and disengagement direction Bu of the third gear 10 with respect to the first gear 8 is and the second gear 9 relative to the first gear 8.
Since the engagement direction C is the biting direction with respect to the rotational direction of the first gear 8, disengagement and engagement switching between these gears 8, 9, and 10 can be performed extremely easily with extremely weak force. .

In addition to the motor for driving the capstan, various types of motors can be used as the motor for driving the tape in the present invention, such as those for driving the reel stand and the head drum.

The present invention is constructed as described above, and since the tape running motor is used in conjunction with the tape loading device, a dedicated motor for the tape loading device can be eliminated, resulting in a very low cost product. .

The number of gears required is the minimum (three) to provide rotational force in both forward and reverse directions for tape loading and unloading, and the structure is very simple.

In addition, since the direction of engagement and release of the second and third gears with respect to the first gear is set in the escape direction with respect to the rotational direction of the first gear, these gears can be released extremely easily with extremely weak force. This allows you to change gears extremely easily.

Furthermore, when tape loading is finished, the second
and the third gear is completely disconnected from the first gear.

That is, the tape loading device is completely disconnected from the motor, and the tape loading device does not load the motor at all.

Therefore, there is no adverse effect such as wow or flutter on tape running, and there are advantages in that tape running is extremely stable and recording and reproducing characteristics can be significantly improved.

[Brief explanation of drawings]

The drawings show an embodiment of a tape loading device in which the present invention is applied to a cassette type VTR, in which Fig. 1 is a perspective view, Fig. 2 is an exploded perspective view, and Figs. It is a top view explaining operation. Also, regarding the symbols used in the drawings, 1 is the motor, 4 is the capstan, 8 is the first gear, 9 is the second gear, 10
is the third gear 12 is the second lever 15 is the second lever 1
6 is the first fulcrum, 17 is the base plate, 18 is the second fulcrum, 20 is the loading ring, 21 is the fourth gear, 25 is the belt,
27 is a stopper, 29 is a first spring, 32 is a second spring,
35 is a lock lever, 144 is a lock release lever, and 48 is an eject slide plate.

Claims (1)

[Scope of utility model registration request] A first gear that is always rotationally driven in one direction by a tape running motor, and a second gear that is engaged with each other and selectively engaged with the first gear. and a third gear, a second lever that pivotally supports the second and third gears, a first fulcrum that pivots the first lever to one end of the second lever, and the other end of the second lever that pivots to the base plate. A second fulcrum is supported, a fourth gear rotates in both forward and reverse directions and is always rotationally driven by either the second gear or the third gear, and the fourth gear rotates in the loading direction or a tape loading means configured to be driven in an unloading direction; a stopper that limits a rotation angle of the second lever to a predetermined angle with respect to the second lever about the first fulcrum; The second lever is moved so that the second gear located on the far side approaches the first gear and the third gear located close to the second fulcrum is moved away from the first gear. a first spring that biases the two levers to rotate about the first fulcrum; and a second spring that rotates the second lever about the second fulcrum so as to move the second and third gears away from the first gear. The second spring rotates to bias the second gear, and the second lever rotates about the second fulcrum against the second spring to approach the first gear. a locking means for engaging the first gear and locking the second lever in the locked position; and a tape loading means for releasing the lock by the locking means near the end of tape loading. By pressing a predetermined position of the first lever in a state in which the lock releasing means is activated and the locking means is released, the first lever is initially moved against the second lever. The second gear is moved away from the first gear by rotating in a predetermined direction about the first fulcrum against the first spring, and the third gear is brought closer to the first gear, and the slider is then rotated. and move the second lever about the second fulcrum in a direction toward the first gear against the second spring, so that the third gear is engaged with the first gear. a tape unloading start operation means, and the first tape unloading start operation means.
A tape loading device, wherein the first and second supporting points are arranged so that a direction in which the second and third gears are uncoupled from the gear is a release direction with respect to a rotational direction of the first gear.