JP2546443B2 - Reel stand moving device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel base moving device in a magnetic recording / reproducing apparatus such as a digital VTR which uses three types of tape cassettes of different sizes, and more particularly to a reel base moving / positioning pressure bonding device. It is about means.

[0002]

2. Description of the Related Art As a reel base moving device of this type, a publication "Technical Report of Television Society" Vol. 12, N
o. 56, PP. 31-36, VR '88 -60 (D
ec. 1988) "Development of mechanism of composite digital VTR" (particularly, contents of "5. cassette loading" on pages 35 to 36 and "Fig. 10" and "Fig. 1").
1)), a pair of reel bases that are movable along a guide shaft and a pair of rotary plates that are rotationally driven in synchronism by a forward and reverse rotatable motor are connected via an arm and a slider. There is a structure in which the sliders and the rotary plate are interlockingly connected with each other, and a crimping means by a spring is interposed between the slider and the rotary plate.

[0003]

In such a conventional reel stand moving device, an arm, a slider and a spring are provided between the rotary plate and the reel stand, and the mechanism is complicated. Since the crimping direction of the spring for positioning and fixing the reel stand at each cassette position is different, and especially when crimping at the intermediate size cassette position, it works at right angles to the moving direction. If there is play between the sliding bearing and the sliding bearing, there is a problem that not only the positioning accuracy may be affected but also the life of the sliding bearing may be greatly affected.

Therefore, an object of the present invention is to perform the movement and the positioning and fixing of the reel base as a series of operations by the same mechanism, thereby simplifying the mechanism and crimping at the time of fixing and fixing the reel base at all cassette positions. The force is the same, and all the crimping directions are obtained in the reel base moving direction, reducing the influence on the slide bearing with respect to the guide shaft,
It is an object of the present invention to provide a reel stand moving device that can improve the life of a plain bearing.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention corresponds to three types of tape cassettes having different reel-to-reel distances. Provided on each of the movable bases, and provided with a pair of rotary plates that are synchronously driven by a motor capable of normal and reverse rotation,
This rotation of the rotating plate moves or moves the moving table.
In a reel stand moving device that is provided with a crimping means for stopping the moving table and positioning the moving table at each cassette position, a notch is formed in the sliding part of the moving table with the guide shaft, and inside the notch. Is provided with two blocks which are engageable with the rotary plate and slidably fitted to the guide shaft, and between the blocks, one block can be pressed against the one end wall of the cutout portion. Through a small cassette
In the cassette and large cassette modes, the moving table is mounted on the rotating plate.
Selective contact with the lid for positioning and rotation plate
With one of the blocks and the crimping means, the moving table
Press, and in the medium cassette mode, position the moving table with the rotating plate.
Place and place one block and crimping hand with rotating plate
It is characterized in that the movable table is pressed through the steps .

[0006]

Operation: A rotating plate that rotates in the forward and reverse directions in synchronization engages with two blocks slidably fitted to the guide shaft, and one block is provided for one end wall of the cutout portion of the moving table sliding portion. The movable table provided with the reel table is moved along the guide shaft by the pressure contact of, and by the crimping means provided between the blocks on the guide shaft, all three types including the intermediate size cassette position are included. At the cassette position, the reel base is positioned and fixed with the same pressure and pressure direction.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, in FIG. 7 showing the cassette size, 1 is a small cassette, 3 is a medium cassette, and 5 is a large cassette. As described above, although the three types of cassettes 1, 3, 5 have different sizes, the loading opening 7 has a common shape,
The positions of the pair of reels 2, 2, 4, 4, 6, 6 are symmetrically arranged on a straight line inclined by about 45 ° with respect to the cassette center line.

In FIG. 1 showing the reel stand moving device according to the present invention, 10 is a reel stand, 20 is a stand, 60 is a main guide shaft, and 70 is a reel stand moving motor. A pair of moving bases 20 each provided with a pair of reel bases 10,
20 is slidably mounted along a pair of main guide shaft 60 and sub guide shaft 69 via a plain bearing (not shown) so as to move on a straight line inclined by about 45 ° with respect to the center line L. ing. The moving table 20 is provided with a pair of sliding portions 21 and 25, which are fitted on the main guide shaft 60 disposed on the center line side, via sliding bearings, respectively, and are spaced apart from each other. A cutout portion 24 is formed between the portions 21 and 25. Further, the sliding portions 21 and 25 are provided with a small cassette stopper 31 and a large cassette stopper 35, which are respectively in contact with a small cassette catcher 61 and a large cassette catcher 65 provided at both ends of the main guide shaft 60. Is provided.

In the cutout portion 24 of the movable table 20 , a pair of blocks 40 and 50, which are similarly fitted respectively on the main guide shaft 60 via a slide bearing (not shown), are provided separately. As described above, the coil-shaped compression spring 30, which is a crimping means, is provided between the blocks 40 and 50 independent of the movable table 20 . The blocks 40 and 50 are also slidably fitted to an auxiliary rotation guide shaft (not shown) arranged parallel to the main guide shaft 60.

On the other hand, between the two main guide shafts 60, 60, a reel stand moving motor 70 and a worm gear 73 on which the forward and reverse rotations are possible with the axis aligned with the center line L are disposed. The motor 70 and the worm gear 73 are interlockingly connected by a belt pulley mechanism 71. Worm wheels 75, 75, which are a pair of rotating plates, mesh with the worm gear 73 from both sides thereof.
5 is arranged below the main guide shaft 60. On the upper surface of one half of the worm wheel 75, two pins 77 and 79 are integrally provided so as to be circumferentially separated from each other with the same radius.

Further, a cam groove arc portion 29 engageable with one pin 79 is formed on the lower surface of one sliding portion 25 of the movable table 20. The cam groove arc portion 29 opens to the end surface of the sliding portion 25 with a radius of curvature that matches the radius of rotation of the pin 79 on the worm wheel 75, and the sliding portion 2
5, the wall surface 2 in the direction orthogonal to the main guide shaft 60
It is also opened to the end surface on the side of the block 50 which can be brought into contact with each other by 7, 57. Then, on the lower surface of the block 50, a straight groove 59 of a cam groove which can be continuously connected to the arc portion 29 of the cam groove.
Are formed. The cam groove straight line portion 59 extends in a direction orthogonal to the main guide shaft 60.

Further, the lower surface of the block 40 incorporated into the other sliding portion 21 of the movable table 20 and capable of contacting each other by the wall surfaces 23 and 43 orthogonal to the main guide shaft 60 is engaged with the other pin 77. A possible cam groove 47 is formed. The cam groove 47 opens an arc portion, which is located at a position parallel to the outside of the turning radius of the pin 77 on the worm wheel 75, to the end surface of the block 40, and the main guide shaft 60 is continuous from the arc portion to the back. It has a straight portion extending in a direction orthogonal to. In FIG. 1, the moving position of the reel stand 10 for the medium cassette is shown by a solid line (see 13), and the moving position of the reel stand 10 for the small cassette and the large cassette is shown by a dotted line (see 11, 15). ing.

The operation of the reel stand moving device of the present invention having the above-mentioned structure is as follows. First, the worm gear 73 is rotated through the belt pulley mechanism 71 by the forward and reverse rotation drive of the motor 70, and the worm wheels 75, 75, which are a pair of rotating plates meshing with both sides of the worm gear 73, rotate in opposite directions in synchronization with each other. , One or both of the respective pins 77, 79 are engaged with the cam grooves 29, 47, 59 to move the pair of movable bases 20, 20 along the respective guide shafts 60, 69, that is, both reels. Movement and positioning crimping are performed according to the cassette size of the tables 10 and 10.

Positioning of the small cassette and the large cassette is performed by hitting the catchers 61 and 65 with the stoppers 31 and 35, respectively. For positioning of the middle cassette, the two pins 77 and 79 are simultaneously moved by the cam groove 47.
It is carried out by engaging the circular arc portion and the circular arc portion 29 of the cam groove. Further, the pressing force for fixing the reel base 10 at each cassette position is the cutout portion 24 of each moving base 20.
Even after the movement, the spring 30, which is the crimping means provided on each of the blocks 40 and 50 in the
Continues to rotate, and the block 40 having the cam groove 47
It is generated by being sandwiched between and the block 50 having the straight portion 59 of the cam groove. That is, both blocks 40 and 50 are
The wall surfaces 43 and 57 and the sliding portions 21 and 2 of the moving table 20.
It is regulated by the contact with the wall surfaces 23 and 27 of 5, and after the reel stand 10 is stopped, only one of the blocks 40 and 50 is moved by the pins 77 and 79 to compress the spring 30, Generates crimping force.

The fixing is completed by the worm wheels 75, 75.
Position sensor (in the figure, three photo interrupters 81, 83,
Although the combination of 85 and the arcuate protrusions 82, 84, 86 is used, a potentiometer or the like may be used. ), The rotation angle is detected, and the motor 70 is stopped. By the way, since the two reel stands 10, 10 are moved in synchronization with each other, the movement according to one of the reel stands 10 will be described in the following description with reference to FIGS.

In the movement and positioning with respect to the small cassette 1, first, only one pin 79 on the worm wheel 75 has the cam groove arc portion 2 of the sliding portion 25 of the moving table 20.
As shown in FIG. 2, the cam groove linear portion 59 of the block 50 is pushed in the moving direction of the reel base 10 through the engagement with the block 50, the block 50, the spring 30, the block 40, and the sliding portion 21. Wall surface 4 in abutting condition
The movable table 20 is moved via the rollers 3 and 23, and the main guide shaft 6
The small cassette catcher 61 at the zero end is brought into contact with the small cassette stopper 31 of the sliding portion 21 of the moving table 20 to perform positioning. Even after the reel stand 10 is stopped, the worm wheel 75 continues to rotate, so that the pin 7
Only the block 50 having the cam groove linear portion 59 that engages with 9 is separated from the wall surface 27 of the sliding portion 25 as illustrated,
The inside of the cutout portion 24 of the movable table 20 is moved to the other block 40 side by the distance x, and the rotation of the worm wheel 75 is stopped there. As described above, the reel stand 10 is fixed by the crimping force obtained by compressing the spring 30 as the crimping means on the main guide shaft 60 by x. Incidentally, FIG. 3 shows a moving state of the small cassette 1 and the middle cassette 3 at an intermediate position. As shown in the drawing, the wall surfaces 43 and 57 of both blocks 40 and 50 are moved by the force of the spring 30 to move the moving table 20. Are in contact with the wall surfaces 23 and 27 of the sliding portions 21 and 25, respectively.

In the movement and positioning with respect to the middle cassette 3, as shown in FIG. 4, both pins 77 and 79 on the worm wheel 75 have cam grooves of the block 40 in which the sliding portion 21 of the moving table 20 is incorporated. The positioning and pressure bonding is performed by simultaneously engaging the circular arc portion 47 and the cam groove circular arc portion 29 of the other sliding portion 25. That is, the sliding part 2
Since the radius of curvature of the cam groove arc portion 29 of 5 is equal to the rotation radius of the pin 79, even if the worm wheel 75 rotates while the pin 79 is engaged with the cam groove arc portion 29, the reel stand 10 Is stopped at the middle cassette position. On the other hand, since the arcuate portion of the cam groove 47 provided in the block 40 on the other sliding portion 21 side is outside the radius of rotation of the pin 77 by the compression distance x of the spring 30, the rotation of the worm wheel 75 causes the pin to rotate. When 77 tries to engage with the arcuate portion of the cam groove 47 (however, the pin 7
7 is formed in advance so that it can be easily inserted. ), Block 40 having the cam groove 47, as shown, away wall 23 of the sliding portion 21, the cutout portion of the moving table 20 24
The inside is moved to the other block 50 side by the distance x, and the rotation of the worm wheel 75 is stopped there. As described above, the reel base 10 is fixed by the crimping force obtained by compressing the spring 30 by x, as described above. In this way, the reel base 10 in the middle cassette position is positioned by the cam groove arc portion 29 of the sliding portion 25 and the pin 79, and the main guide by the engagement of the arc portion of the cam groove 47 of the block 40 and the pin 77. The compression is performed by the compression of the spring 30 on the shaft 60.

By the way, the cam groove arc portion 29 and the cam groove 4
By changing the length of the circular arc portion of 7, it is possible to change the length of the stop time. As a result, a margin can be provided for the positioning accuracy at the middle cassette position. That is, when the worm wheel 75 can be rotated and stopped with high accuracy, the lengths of the arc portions of the cam groove 29 and the cam groove 47 are shortened to instantly stop the movement of the reel base 10.
The positioning can be speeded up. On the other hand, when the worm wheel 75 can only be rotated and stopped at a low precision due to cost reduction, the cam groove arc portion 29 and the cam groove 47 arc portions are made to have a large length to allow control of the worm wheel 75. Can be given. That is, the positioning accuracy is determined by the cam groove accuracy and the pin position, and the rotational phase detection accuracy of the worm wheel 75 by the sensor has an advantage of not affecting the positioning accuracy of the reel base 10. Incidentally, FIG. 5 shows a moving state of the middle cassette 3 and the large cassette 5 at an intermediate position, and in this case also, as shown in the figure, both blocks 4
The wall surfaces 43 and 57 of 0 and 50 are in contact with the wall surfaces 23 and 27 of the sliding portions 21 and 25 of the movable table 20 by the force of the spring 30, respectively.

In the movement and positioning with respect to the large cassette 5, as shown in FIG. 6, contrary to the case of the small cassette 1, the other pin 7 on the worm wheel 75 is arranged.
7 engages with the arcuate portion of the cam groove 47 provided in the block 40 on the sliding portion 21 side of the moving table 20 and pushes the rectilinear portion in the back in the moving direction of the reel table 10 to move the block 40. , Spring 30, block 50 and sliding part 2
The movable table 20 is moved through the wall surfaces 57 and 27 in the abutting state of 5, and the large cassette catcher 66 at the end of the main guide shaft 60 is hit by the large cassette stopper 35 of the sliding portion 25 of the movable table 20. , Positioning is performed. Even after the reel base 10 is stopped, the worm wheel 75 continues to rotate, so that the cam groove 47 that engages with the pin 77.
Only the block 40 having the
The worm wheel 75 is stopped from moving away from the wall surface 23 in the notch 24 of the moving table 20 toward the other block 50 by the distance x. As described above, the reel stand 10 can secure the spring 30 on the main guide shaft 60 to the x position.
It is fixed only by the crimping force that is compressed. As described above, at the small cassette position and the large cassette position, movement and pressure bonding are performed by the engagement of one set by the two blocks 40 and 50 having the two pins 77 and 79 and the cam grooves 47 and 59, and the other. The set is free with no engagement.

As described above, the movement of the pair of reel bases 10 and 10 according to the cassette size and the positioning and pressure bonding of the reel bases 10 and 10 to all the cassette positions are performed between the sliding portions 21 and 25 of the moving base 20. A pair of blocks 40, 50 provided on the main guide shaft 60 in the notch portion 24 , and having cam grooves 47, 59 for engaging with the two pins 77, 79 on the worm wheel 75, and between them. Since a series of operations can be performed by the same mechanism using the crimping spring 30 that has been reduced in size, the mechanism can be simplified. And at all cassette positions, including the medium cassette position,
The compression force of the spring 30 between the blocks 40 and 50 is made equal, and the spring 3 along the moving direction of the reel stand 10 is moved.
When 0, the same crimping force and crimping direction can be obtained, so that the sliding bearing of the movable table 20 is less affected, the life of the sliding bearing can be improved, and the reliability of positioning crimping can be improved.

By the way, in the above-mentioned embodiment, the radii of rotation of both pins 77 and 79 are made the same, and the radius of the arc portion of the cam groove 47 is increased in accordance with the crimping force. Alternatively, the radius of gyration may be reduced. When the stroke between the middle cassette and the small cassette and the movement between the middle cassette and the large cassette is extremely different, the radius of rotation of the pins 77 and 79 and the curvature of the arc portion of the cam groove 47 and the arc portion 29 of the cam groove. Both radii may be changed according to the stroke. Further, in the above embodiment, the moving speed of the reel stand 10 can be controlled by forming the straight portion of the cam groove 47 and the straight portion of the cam groove 59 into a curved portion. This allows you to slow down as you approach the stop. Further, although the reel base moving device corresponding to three kinds of cassette sizes is used in the embodiment, the pins, the notches, the blocks, the cam grooves and the springs may be modified so as to correspond to four or more kinds of cassette sizes. Is also possible.

[0022]

As described above, according to the present invention, between reels
Corresponding to three types of tape cassettes with different distances, a pair
A pair of movable stands that can move the reel stand along the guide axis.
, And each of them is synchronized with a motor that can rotate forward and backward.
By providing a pair of driven rotating plates,
If you move the mobile platform more or stop the mobile platform
Both are crimping hands that position the moving table at each cassette position.
In a reel table moving device that is provided with steps,
A notch is formed in the sliding part with the id shaft.
Can be engaged with the rotary plate inside the part and slidably fitted to the guide shaft
Between the two blocks with two blocks
One block can be pressed onto the wall of the cutout.
A small cassette and a large cassette
In the mode, the rotary table selectively abuts the movable table on the stopper.
And position it with a rotating plate
Press the moving table through one side and the crimping means to set the middle cassette
In the mode, the rotary table is used to position and move the movable table.
Push the moving table through the block and crimping means with the rolling plate.
It was configured to press. 2 on the guide shaft due to the rotation of the rotating plate
By engaging with one block, the one block is pressed against one end wall of the cutout portion of the moving table sliding portion to move the moving table along the guide axis, and also includes an intermediate size cassette position. At all three cassette positions,
The crimping means installed between the blocks on the guide shaft can obtain the same crimping force and crimping direction to position the reel stand.
Can be crimped. In this way, there are three types of cassette positions , large, medium and small.
The movement of the reel stand and the positioning and pressure bonding can be performed by the same mechanism. Therefore, the mechanism can be simplified.
It Uniform crimping force can be obtained at the time of crimping the reel stand at three types of cassette positions, large, medium and small, and the crimping direction can be obtained in the reel stand moving direction. Therefore, it is possible to reduce the influence of the guide shaft on the slide bearing in the slide portion of the movable table, and to improve the life of the slide bearing.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing the configuration of a reel stand moving device according to the present invention.

FIG. 2 is an enlarged plan view of an essential part showing a moving state to a small cassette position according to the present invention.

FIG. 3 is a plan view of an essential part showing a moving state of the small cassette and the middle cassette according to the present invention at an intermediate position.

FIG. 4 is an enlarged plan view of an essential part showing a moving state to a middle cassette position according to the present invention.

FIG. 5 is an enlarged plan view of an essential part showing a moving state of the middle cassette and the large cassette at an intermediate position according to the present invention.

FIG. 6 is an enlarged plan view of an essential part showing a moving state to a large cassette position according to the present invention.

FIG. 7 is a plan view illustrating three types of cassette sizes.

[Explanation of symbols]

10 ... Reel stand, 20 ... Moving stand, 21, 25 ... Sliding part,
24 ... Notch, 29, 47, 59 ... Cam groove, 30 ...
Crimping means, 31 , 35 ... Stoppers, 40 , 50 ... Blocks, 60, 69 ... Guide shafts, 70 ... Motors, 75 ... Rotating plates, 77, 79 ... Pins.

Continuation of the front page (56) References JP-A-2-285546 (JP, A) Actual development Sho 61-90040 (JP, U)

Claims (1)

(57) [Claims] 1. A pair of reel stands corresponding to three types of tape cassettes having different reel-to-reel distances are provided respectively on a pair of movable stands movable along a guide shaft, and are synchronized by a forward and reverse rotatable motor. Moshiku which a pair of rotary plates that is rotated to move the moving base by the rotation of the rotating plate Te
In the reel stand moving device which is provided with a crimping means for stopping the moving table and positioning the moving table at each cassette position, a notch is formed in a sliding portion of the moving table with the guide shaft. Two blocks that are engageable with the rotary plate and slidably fitted to the guide shaft are provided in the cutouts, and one block is provided between the blocks at one end wall of the cutouts. The crimping means that enables pressure contact is provided, and in the small cassette and large cassette modes, it is a moving table with a rotating plate.
While selectively abutting on the stopper,
Rotating plate via one of the blocks and the crimping means
Press the moving table, and in the medium cassette mode, position the moving table with the rotating plate.
With the rotary plate through one block and crimping means
A reel stand moving device having a structure for pressing a moving stand .