JPS6327301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape loading device that is most suitable for application to recording and reproducing devices such as VTRs and other various tape running devices.

As is well known, tape loading devices for VTRs can be roughly divided into two types: a loading method using a loading ring, commonly known as the U loading method, and a loading method using a loading ring, commonly known as the M loading method, in which a pair of tape guides are moved along a single plane. There is a loading method that allows The U-loading method has a drawback in that the size of the device tends to be large, particularly in plan view, due to the use of a loading ring. In addition, in the M loading method, a pair of tape guides is moved only along one plane, and the tape is wound around a rotating head drum that is inclined with respect to that plane. There is a defect in which the tape intersects the head drum at an angle and the tape being passed between the tape guides is severely twisted and pressed against the rotating head drum, causing the tape to be severely damaged.

The present invention was devised to correct the above-mentioned defects, and it is possible to make the size of the device extremely small, for example, in a two-dimensional manner, and also to prevent damage by applying excessive force to the tape. The purpose of this invention is to provide a tape loading system that prevents such problems as much as possible.

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

First, in FIG. 1, reference numeral 1 denotes a tape cassette, in which a pair of reels 2a, 2b and a tape 3 wound around them are housed. This tape cassette 1 is mounted horizontally on a pair of reel stands 5a and 5b provided on a mechanical board 4 of the VTR main body. 7a, 7b, and 7c are tape guides. and a pair of tape guides 7
a and 7b are attached to both front and rear ends of a long moving table 8, and the remaining tape guide 7c is attached to a short moving table 9. 10 is mechanical board 4
This is the loading board attached to the top. This loading board 10 is provided along the outer periphery of a rotating head drum 11 mounted on a mechanical board 4, and is provided with a guide groove 12 that constitutes a guide in the present invention that guides the movable platforms 8 and 9. It is being The guide groove 12 is gradually curved along the outer periphery of the rotary head drum 11 from a position below the opening 1a of the tape cassette 1. Further, as shown in FIG. 3, this loading board 10 has a horizontal shape that is almost parallel to the mechanical board 4 on the side of the tape cassette 1, and extends toward the outer periphery of the rotary head drum 11, for example, about 10 mm. It is gradually tilted upward at an inclination angle of about .

That is, the loading board 10 has a first plane 51 on the side of the tape cassette 1 shown in FIG.
A second plane 52 on the rotary head drum 11 side shown in the figure and these first planes 5 shown in FIG.
1 and a second plane 52, and the first plane 51 is the surface of the tape 3 stretched between the pair of reels 2a and 2b of the tape cassette 1. The plane is perpendicular or substantially perpendicular to the longitudinal direction of the tape 3 and parallel or substantially parallel to the longitudinal direction of the tape 3. Further, the second plane 52 is pulled out from the tape cassette 1 and attached to the rotary head drum 11.
The end of the tape 3 wound around the circumferential surface of the rotary head drum 11 is perpendicular or almost perpendicular to the surface of the tape 3, and the end thereof is parallel or almost perpendicular to the longitudinal direction of the tape 3. It is constructed in parallel planes. Further, the third surface 53 is configured to be an inclined surface connecting the first plane 51 and the second plane 52 or a suitable curved surface. and guide groove 12
are provided along the first and second planes 51, 52 and the third plane 53.

A pinch roller lever 13 is rotatably provided on the mechanical board 4 about a fulcrum shaft 14, and a pinch roller 15 and a tape guide 16 are attached to the tip thereof. Further, 17 is a capstan, 18 is a control head that also serves as an audio head, 19 is a full-width erasing head, and 20 is a tape guide with a plurality of fixed positions.

According to this tape loading device, first, the tape guides 7a to 7c, the pinch roller 15, etc. are returned to the positions indicated by the imaginary lines in FIG. 1 after unloading is completed. In this state, the tape cassette 1 is installed, and the tape guides 7a to 7c, the pinch roller 15, etc. are inserted into the opening 1a of the tape cassette 1, and the tape bus shown by the imaginary line in FIG. inserted inside. The tape loading operation is started in the above state, and first, the moving table 8 moves along the guide groove 12 in the direction indicated by the arrow A.
direction, and after a certain period of time, the moving table 9 is also moved in the same direction. As a result, the tape guide pin 7a
7c, the tape 3 is sequentially hooked and gradually drawn out of the opening 1a of the tape cassette 1. At the same time, the pinch roller lever 13 is also rotated in the direction of arrow B, and the pinch roller 1
5. The tape 3 is hooked on the tape guide 16 and pulled out of the tape cassette 1. The tape loading operation is completed when the tape guides 7a to 7c, the pinch roller 15, etc. reach the positions indicated by solid lines in FIG. At this point, the tape 3 is helically wound around the circumferential surface of the rotating head drum 11 as shown by the solid line in FIG.
etc. Thereafter, the pinch roller 15 is brought into rolling contact with the capstan 17, so that the tape 3 is run as is conventionally known, and desired recording or reproduction is performed. Note that the tape unloading operation is a reverse operation of the tape loading operation described above.

Next, details of the drive system of the tape loading device will be explained with reference to FIGS. 2 to 6.

First, a coil spring 22, which constitutes a coiled member in the present invention, is provided in a curved state below the loading board 10 so as to substantially follow the guide groove 12. A pair of shafts 23a, 23b are attached to both ends of the coil spring 22 with the same axis.
is a pair of bearings 24 mounted on the mechanical board 4
It is rotatably supported on the shafts a and 24b. At the other end of the coil spring 22, a motor shaft 26 of a motor 25, which is rotatable in forward and reverse directions and is mounted on the mechanical board 4, is connected to the shaft 23b either directly or via an appropriate speed reduction mechanism. Therefore, the coil spring 22 is configured to be rotationally driven in the curved state by the rotation of the motor 25.

On the other hand, the moving tables 8 and 9 are arranged below the loading board 10, and include tape guides 7a, 7b,
Each of the central axes 28a, 28b, 28c of 7c passes through the guide groove 12, and these central axes 28a to 28
The movable platforms 8 and 9 are guided by c. A substantially H-shaped plate spring 2 is fitted to the lower end of each of the central shafts 28a to 28c.
9 is pressed onto the loading board 10,
The moving platforms 8 and 9 are configured to be pressed against the lower surface of the loading board 10 and slid by the pressing reaction force of these leaf springs 29. The front end 29a of each leaf spring 29 is placed on a nearly ten-shaped leading guide 30 that is loosely fitted into the guide groove 12.

Further, an engagement arm 32 is rotatably attached to the rear end of the movable table 8. This engagement arm 32 has an axis P 2 inclined at a predetermined angle θ ₁ with respect to the longitudinal direction P ₁ of the movable base 8, and rotates around a rotation center shaft ₃₃ provided on the movable base 8. It is attached so that it can move freely. Furthermore, a protrusion 34 protruding in the axial direction of the coil spring 22 is provided at the tip of the engagement arm 32, and this protrusion 34 is engaged in the air core 22a of the coil spring 22. In accordance with the curvature of the coil spring 22, the axis _P3 of the protrusion 34 is inclined at a predetermined angle _θ2 with respect to the longitudinal direction _P4 of the engagement arm 32.

Further, the movable base 8 and the movable base 9 are connected by a wire (or string-like body) 36. A pin 37 is provided at the bottom of the movable table 9, and this pin 37 is detached from the coil spring 22. Further, a stopper 38 of a pin 37 is attached to the mechanical board 4 at the stop position of the tape guide 7c shown in FIG.

By the way, when the tape guides 7a to 7c are at the positions indicated by the imaginary lines in FIG. 1 in the unloading completed state, the movable table 9 is pushed back by the movable table 8. Further, the engaging arm 32 is in a substantially horizontally folded state as shown in FIGS. 5 and 6.

Next, when the coil spring 22 is driven in the forward rotation by the motor 25 in the above state, the moving table 8 is first moved along the guide groove 12 by the feeding action of the engagement arm 32 by the coil spring 22 as shown in FIG. Start moving in the direction of arrow A. As the moving table 8 moves, the wire 36 is pulled, and from the point at which the wire 36 is fully stretched, the moving table 9 follows the moving table 8 and moves in the direction of arrow A in FIG. 1 along the guide groove 12. start moving. As described above, the tape guides 7a to 7c on the movable tables 8 and 9 are moved in the direction of arrow A along the guide groove 12 while maintaining a predetermined interval, and the above-described loading operation of the tape 3 is performed. At this time, as the moving platforms 8 and 9 are gradually raised as the loading board 10 is tilted, the tape guides 7a to 7c are rotated in the direction of arrow A while gradually rising around the rotating head drum 11. go.

As shown in FIG. 3, as the movable base 8 rises, the distance between the movable base 8 and the coil spring 22 gradually increases. However, since the distal end of the engagement arm 32 is engaged in the air core portion 22a of the coil spring 22 by the projection 34, the engagement arm 32 does not come off from the coil spring 22. Further, as the above-mentioned interval increases, the engagement arm 32 is rotated in the direction of arrow C about the rotation center axis 33 as shown in FIG. 7, so that no inconvenience occurs due to the above-mentioned increase in the interval , the movable table 8 is smoothly moved in the direction of arrow A.

Further, each leaf spring 29 is guided by each leading guide 30 and smoothly slides on the loading board 10 along the guide groove 12 while maintaining a predetermined directionality.

The tape loading operation is completed when the tape guides 7a to 7c reach the position indicated by the solid line in FIG. 1, but at this time, as shown in FIG. is guide groove 1
2 or the front end of the moving platform 8 comes into contact with a stopper (not shown) attached to the mechanical board 4 or the loading board 10,
The moving table 8 is stopped. Further, the moving table 9 moving behind comes into contact with the stopper 38 by the pin 37 and is stopped. On the other hand, a sensor (not shown) indicates that the tape guides 7a to 7c have reached the position indicated by the solid line in FIG.
The motor 25 is stopped after a certain period of time has elapsed after the movable tables 8 and 9 have stopped.
As a result, the engagement arm 3 of the coil spring 22
2 and the shaft 23b, both movable bases 8 and 9 are pressed against the stopper side and stably fixed in a fixed position. At this time, motor 2
To turn off the switch 5, either lower the voltage gradually, or turn off the motor 25 at the moment you turn off the switch.
If you shoot the terminal of the motor 25 and apply the brake using the counter electromotive force, the motor 25
This is advantageous because it prevents the coil spring 22 from loosening after it has stopped.

Note that when the coil spring 22 is driven to reverse rotation by the motor 25 in the tape loading completion state, the tape guides 7a to 7a are moved by the movable tables 8 and 9.
7c is moved in the opposite direction of arrow A, and the tape 3 is unloaded. At this time, the movable base 9 is pushed back by the movable base 8, and the engaging arm 32 is gradually folded in the opposite direction of arrow C in FIG.

By the way, according to the tape loading device described above, when the tape guide 7a and the like are moved along the first plane 51 of the loading substrate 10, the axial direction thereof is parallel or substantially parallel to the surface of the tape 3. , and in a state perpendicular or almost perpendicular to the longitudinal direction of the tape 3 and in contact with the tape 3 without any twist to the tape 3.
bring out. Further, in the second plane 52 portion of the loading board 10, the tape guide 7a and the like similarly contact the tape 3 without twisting the tape 3 to pull out the tape 3. While the tape guide 7a and the like are moved along the third surface 53 of the loading board 10,
The height and angle are gradually changed, and the tape 3 is not twisted at all during this time. Therefore, the above-described loading of the tape 3 can be carried out in a manner that prevents damage to the tape 3 by applying excessive force to the tape 3 as much as possible.

FIG. 8 shows a modified example in which a pair of guide pieces 40 bent downward are integrally formed on a part of the tip 29a of each leaf spring 29. The guide piece 40 is engaged in the guide groove 12, and the leaf spring 29 is guided along the guide groove 12 by these guide pieces 40.

Although the embodiments of the present invention have been described above, the tape guide referred to in the present invention is not limited to those shown in the embodiments, and the guide groove 12 is used in the embodiment as the guide referred to in the present invention. However, various types of guides other than groove-shaped can be used.

As described above, the present invention includes a first plane that is substantially perpendicular to the plane of the tape stretched between the pair of reels of the attached tape cassette and substantially parallel to the longitudinal direction of the tape; The tape drawn out from the tape cassette and wound around the circumferential surface of the rotary head drum is approximately perpendicular to the plane of the tape at the end on the rotary head drum side and approximately relative to the longitudinal direction of the tape at that end. A substrate having parallel second planes and a third plane connecting these first and second planes is provided, and along the first and second planes and the third plane of this substrate, A guide is provided along the tape cassette, and a tape guide is provided to be moved along the guide, and the tape is pulled out from the tape cassette and wrapped around the circumferential surface of the rotary head drum by the movement of the tape guide. Since it is a tape guide, the moving path of the tape guide can be arbitrarily and freely set, so the size of the device can be made significantly smaller, for example, in terms of two dimensions, compared to the conventional U loading method. It is possible to obtain a very compact product, and the degree of freedom in design is very large. In addition, tape loading can be performed while smoothly changing the height and angle of the tape guide without applying any unreasonable force to the tape, such as twisting the tape.
Compared to the loading method, the tape can be loaded with as little damage to the tape as possible, and the tape life can be significantly increased.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a tape loading device for a VTR. Fig. 1 is an overall partially cutaway plan view, and Fig. 2 illustrates the drive system of the tape loading device. Fig. 3 is a developed sectional view of the main parts of the same as above, Fig. 4 is a perspective view of the moving table, and Fig. 5 shows the case when the moving table is positioned on the horizontal part of the loading board. A plan view showing the relationship between the engagement arm and the coil spring, FIG. 6 is a view taken from the line shown in FIG. 5, FIG. 7 is a view taken taken from the line shown in FIG. FIG. Further, in the symbols used in the drawings, 1... tape cassette, 2a, 2b... reel, 3... tape, 7a, 7b, 7c... tape guide, 8...
...Moving table, 10...Loading board, 12...
Guide groove (guide), 22... coil spring (tape guide driving means), 25... motor.

Claims (1)

[Scope of utility model registration request] A first plane that is substantially perpendicular to the plane of the tape stretched between the pair of reels of the attached tape cassette and substantially parallel to the longitudinal direction of the tape, and a second plane substantially perpendicular to the plane of the tape at the end of the tape wound around the circumferential surface on the side of the rotating head drum and substantially parallel to the longitudinal direction of the tape at that end; A substrate having a third surface connecting the first and second planes is provided, a guide is provided along the first and second planes and the third surface of this substrate, and the method is moved along the guide. 1. A tape loading device comprising: a tape guide configured to rotate the tape; and movement of the tape guide causes the tape to be pulled out from the tape cassette and wrapped around the circumferential surface of the rotary head drum.