JPS6128280Y2 - - 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.

The applicant of the present invention has proposed an earlier invention (Japanese Patent Application No. 10,784/1986) in which a tape loading member is moved by rotating a flexible coiled member.
No.) has already been submitted. The present invention relates to an improvement on the above-mentioned prior invention, and aims to provide a tape loading device that can be made even thinner.

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. Reference numerals 7a, 7b, and 7c are tape guides constituting tape loading members in the present invention. 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 rotary head drum 11 mounted on a mechanical board 4, and is provided with a guide groove 12 for guiding the movable tables 8 and 9. 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 . 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 7b, the pinch roller 15, etc. are moved back to the position indicated by the imaginary line in FIG. 1 when unloading is completed. In this state, the tape cassette 1 is installed, and the tape guides 7a to 7b, the pinch roller 15, etc. are inserted into the opening 1a of the tape cassette 1, and the tape path 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 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 constituting 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 2 mounted on a 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 under the loading board 10, and the chief guides 7a, 7b, 7
Each of the center shafts 28a, 28b, 28c of the guide groove 12 is inserted through the guide groove 12, and the movable platforms 8, 9 are guided by these center shafts 24a to 24c. A substantially H-shaped plate spring 29 is fitted to the lower end of each of the central shafts 28a to 28c.
are pressed onto the loading board 10, and the reaction force of the plate springs 29 causes the movable bases 8,
9 is configured to be pressed and slid against the lower surface of the loading board 10. In addition, each leaf spring 2
The front end 29a of the guide 9 is placed on a leading guide 30 which is loosely installed in the guide groove 12 and has a substantially ten-shaped shape.

Further, an engagement arm 32 is rotatably attached to the rear end of the movable table 8. This engagement arm 32 has an axis P2 inclined at a predetermined angle _θ1 with respect to the longitudinal direction _P1 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.
Also, a stopper 38 of the pin 37 is located on the mechanical board 4 at the stop position of the tape guide 7c shown in FIG.
is installed.

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. Since the engagement arm 32 is engaged within the air core portion 22a of the spring 22, the engagement arm 32 will 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 39 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 positions indicated by solid lines in FIG. 1, but at this time, as shown in FIG. Guide groove 12
The movable base 8 is stopped by contacting the terminal end 12a of the movable base 8 or a stopper (not shown) attached to the mechanical board 4 or the loading board 10 at the front end of the movable base 8. Further, the moving table 9 moving behind is brought into contact with the stopper 38 by the pin 30 and stopped. On the other hand, a sensor (not shown) detects that the tape guides 7a to 7c have reached the position indicated by the solid line in FIG. Ru. As a result, the engagement arm 32 of the coil spring 22
Due to the action of the tension spring at the portion between the shaft 23b and the shaft 23b, the movable tables 8 and 9 are both 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 moving bases 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.

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 both guide pieces 40.

Although the embodiments of the present invention have been described above, the tape loading member, coiled member, engagement arm, etc. referred to in the present invention are not limited to those shown in the embodiments, and may be any other effective material. Can be changed to a structure.

According to the embodiment described above, since the engagement arm 32 rotatably attached to the movable base 8 is configured to engage with the coil spring 22, the inclined portion of the loading board 10 is moved as the movable base 8 moves. Then, the engaging arm 32 rises downward as shown in FIG. 7, and is folded in the horizontal portion as shown in FIG. 6.
Therefore, the space factor is very good, and the entire loading device can be made significantly thinner.

Further, since a protrusion 34 is provided at the tip of the engagement arm 32 and is configured to be engaged in the air core portion of the coil spring 22, the engagement arm 32
There is no possibility that the coil spring 22 will accidentally come off from the coil spring 22, and on the contrary, the coil spring 22 is guided by the protrusion 34. As a result, there is no need to provide a special guide for the coil spring 22, and the installation of the coil spring 22 becomes extremely easy, allowing for a large simplification of the structure.

Further, as shown in FIG.
is attached rotatably diagonally to the moving table 8,
In addition, since the protrusion 34 is also inclined, the protrusion 34 is engaged with the coil spring 22 along the curvature of the loading board 10 whether it is on the inclined part or on the flat part. As a result, the engagement between the engagement arm 32 and the coil spring 22 becomes very smooth, and the movement of the movable table 8 by the coil spring 22 can always be performed smoothly.

In addition, each leaf spring 29 is connected to the leading guide 30 or the guide piece 4.
Since the plate spring 29 is configured to be guided by the guide groove 12, the plate spring 29 can be smoothly slid along the guide groove 12, and the plate spring 29 can be made compact.

As described above, in the present invention, an engagement arm is rotatably attached to a moving table for moving a tape loading member, and the tip of this engagement arm is engaged with a coiled member, so that the coiled member is moved. Since the movable base is configured to be moved via the engagement arm by rotation, changes in the distance between the movable base and the coiled member can be absorbed by the rotation of the engagement arm. . Therefore, the space factor becomes very good, the whole device can be made thinner, the coiled member can be easily installed, and the structure can be simplified.

[Brief explanation of the drawing]

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. Also, in the symbols used in the drawings, 7a, 7
b, 7c...Tape guide, 8...Moving table, 10
... Loading board, 12 ... Guide groove, 22
...Coil spring, 25...Motor, 32...
...Engagement arm, 33...Rotation center axis, 34...
It is a protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A moving platform to which a tape loading member is attached is provided so as to be movable along a guide groove provided on a substrate, and a flexible coil-shaped member is attached to the guide groove. The tip of an engagement arm rotatably attached to the movable table is engaged with the coiled member, and the coiled member is rotationally driven by a motor. A tape loading device configured to move a loading member along the guide groove. (2) A utility model registration claim 1 in which a protrusion protruding in the axial direction of the coiled member is provided at the tip of the engagement arm, and the protrusion is engaged in the air core of the coiled member. Tape loading device as described. (3) The tape loading device according to claim 1, wherein the engaging arm is configured to be rotatable around a center inclined at a predetermined angle with respect to the longitudinal direction of the moving table.