JPH0351787Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a reel stand moving device that is most suitable for application to, for example, a cassette-type video tape recorder, and is capable of moving, for example, two types of cassettes of different sizes, large and small. This invention relates to a reel stand moving device that can automatically adjust the interval between reel stands in accordance with these two types of cassettes, large and small.

[Conventional technology]

The invention of a reel stand moving device for a cassette type video tape recorder (Japanese Patent Laid-Open No. 60-40545), which was previously filed by the applicant of the present invention, will be explained with reference to FIGS. 4 to 6.

First, as shown in FIG. 4, this reel table moving device allows selection of large and small cassettes 23 and 24 in order to properly use the large cassette 23 indicated by a chain line and the small cassette 24 indicated by a chain double dot line. It is configured so that the interval between the pair of left and right reel stands 28 is automatically adjusted when the reel is mounted. At this time, the pair of left and right reel stands 28 are arranged on the chassis 27 of the video tape recorder main body 26, and these two reel stands 28 are used to reel the left and right pair of reels in the large cassette 23 shown by solid lines (Fig. An arrow a is drawn between the reel stand center position P1, which matches the reel center position coordinates of the reel (not shown), and the reel stand center position P2, which matches the reel center position coordinates of the pair of left and right reels (not shown) in the small cassette 24. and horizontally moved in the direction b, so that the center distance between the two reel stands 28 is adjusted to a large distance 11 and 12.

A pair of left and right reel motors 30 are fixed to the lower part of the center of the pair of left and right moving tables 29, and the motor shafts 31 of both reel motors 30 are vertically projected above both moving tables 29. Both reel stands 28 are attached to the upper ends of both motor shafts 31. Furthermore, a pair of guide shafts 32 and 33 parallel to the directions of arrows a and b are arranged on each side of both reel motors 30, and each pair of guide shafts 32 and 33 is mounted on the chassis 27. Both ends 34a of each pair of support stands 34, 35,
It is installed horizontally between 34b, 35a, and 35b. Both ends 29a, 29 of both moving tables 29
These ends 29a, 29b are connected to each pair of guide shafts 3 by metal bearings fixed in each
2 and 33 so as to be slidable.

Therefore, both moving tables 29 are connected to each pair of guide shafts 3.
2 and 33 and slide in the horizontal direction, both reel stands 28 are connected to both reel motors 3.
0 is horizontally moved between the reel stand center positions P1 and P2 in the directions of arrows a and b.
In this case, for example, both ends 34a and 34b of the support base 34 on one side are configured as stoppers of the movable base 29, and as shown in FIG. 6, the reel stand 28 is positioned at the center position P1 of one reel stand, and as shown in FIG.
b, the reel stand 28 is configured to be positioned at the center position P2 of the other reel stand. Further, during the horizontal movement, the lower ends of both reel motors 30 move within a pair of oblong holes 37 provided in the chassis 27.

Next, as shown in FIGS. 5 and 6, a drive motor 39 is mounted horizontally on the chassis 27, and its horizontal motor shaft 40 is extended in one direction to move the chassis 27. It is rotatably supported within a gearbox 41 mounted above via a pair of left and right bearings 42. A pair of left and right worms 43 are fixed to the motor shaft 41 at a distance from each other. Note that both of these worms 4
The helical directions of the screws No. 3 are opposite to each other. Further, a pair of left and right worm wheels 44 engaged with both of these worms 43 are attached to the gear box 41.
A pair of vertical left and right rotating shafts 4 attached to the
5 and is rotatably supported. Both worm wheels 44 and both moving tables 29 are interlocked via respective pairs of drive arms 46 and 47. At this time, the motor shaft 40 is connected to both reel stands 2.
Both worms 43 and both worm foils 44 are arranged at right angles to the center line P3 between the two worms 43 and 44, and are arranged so as to be distributed left and right with respect to the center line P3. Also, each pair of drive arms 46, 4
7 are arranged symmetrically with respect to the center line P3.

Next, both vertical rotating shafts 45 are rotatably supported at their upper and lower ends by a gear box 41 via a pair of bearings, and both worm wheels 44 are fixed in the middle of these rotating shafts 45. There is. Collars 48 are rotatably inserted into the outer peripheries of the upper ends of both rotating shafts 45, and one ends 46a of both drive arms 46 are rotatably supported on the outer peripheries of these collars 48. Further, a circular recess 49 is formed on the upper surface of both worm wheels 44, and a projecting piece 50 extending vertically downward from one end 46a of both drive arms 46 is inserted into the circular recess 49. And both circular recesses 4 of both worm foils 44
9 is a pair of limiter springs 51 made of tension springs.
are inserted into a semi-circular arc, one end 51a of both limiter springs 51 is locked to a protrusion 50 of both drive arms 46, and the other end 51b
are locked by locking pins 52 implanted in both circular recesses 49. Therefore, both drive arms 46 are urged to rotate in the direction of arrow c in FIGS. 5 and 6 with respect to both worm wheels 44 by both limiter springs 51. Note that both drive arms 46 are configured to abut against the upper ends of both locking pins 52 and are restricted from rotating in the direction of arrow c. Also, the pivot pin 5 implanted in the other end 46b of both drive arms 46
3, one end 47a of both drive arms 47 is rotatably supported. And these two drive arms 47
A slit 54 provided at the other end 47b is engaged with a pair of locking pins 55 implanted on one end 29a of both movable bases 29. A pair of limiter springs 56 made of tension springs are arranged in parallel on both drive arms 47, and both ends 56a, 56b of these limiter springs 56 are attached to both pivot pins 56.
3 and both locking pins 52.

The distance adjustment between both reel stands 28 by this reel stand moving device is performed as follows.

First, as shown by the solid line in Fig. 4, both reel stands 2
When the small cassette 24 is attached to the video tape recorder main body 26 while the small cassette 8 is located at the reel stand center position P1 corresponding to the large cassette 23, a large/small cassette detection sensor (not shown) detects the small cassette. 24 is detected.

Then, as shown in FIG. 5, the motor shaft 40 of the drive motor 39 is driven to rotate in the direction of the arrow d, and both the worm wheels 44 are rotated in opposite directions by the two worms 43 whose screw directions are opposite to each other. They are rotated by the same angle in the direction of arrow c. Then both locking pins 5 of both worm wheels 44
2, both limiter springs 51 are pulled, and both drive arms 46 are rotated in the same direction as both worm wheels 44 while in contact with both locking pins 52. Both drive arms 46 and both drive arms 77
Connect both locking pins 55 of both moving bases 29 via arrow a
Press in the direction.

As a result, both moving tables 29 move to each pair of guide shafts 3.
2 and 33 and are slid in the direction of the arrow a in FIG. The interval between the centers of the reel stands of 28 is automatically adjusted to the small interval l2.

At this time, when both reel stands 28 reach the reel stand center position P2, as shown in FIG.
4b and are stopped, but both worm wheels 44 continue to rotate in the direction of arrow c, and both limiter springs 51 are strongly pulled in the direction of arrow c by both locking pins 52. and both worm foils 4
4 is rotated to a predetermined position and detected by a rotational position detection sensor (not shown), the drive motor 39 is stopped, and the spring force of both limiter springs 51 causes both movable bases 29 to move toward both stoppers 34b with the arrows. It is positioned by being strongly pressed elastically from the direction a. Note that both worm foils 44 are
3, it remains locked in its stop position.

After the interval adjustment operation between the two reel stands 28 is completed, the small cassette 24 is attached to both the reel stands 28 from above as shown by the two-dot chain line in FIG.
A pair of left and right reels in the small cassette 24 are engaged with both reel stands 28.

Next, as shown by the one-dot chain line in FIG. 4, with both reel stands 28 positioned at the reel stand center position P2 corresponding to the small cassette 24, the video tape recorder main body 26 and the large cassette 24 are mounted. Then, a large and small cassette detection sensor (not shown) detects the large cassette 23.

Then, as shown in FIG. 6, the motor shaft 40 of the drive motor 39 is rotationally driven in the direction of arrow e, and both worm wheels 44 are rotated by the same angle in the direction of arrow f, which is the opposite direction, by both worms 43. Rotated. Then, both locking pins 52 of both worm wheels 44 come into contact with both drive arms 46, and these two drive arms 46 are rotated in the same direction as both worm wheels 44. Then, both limiter springs 56 are pulled by both pivot pins 53 of both drive arms 46, and both locking pins 55 of both moving bases 29 are pulled in the direction of arrow b.

As a result, both moving tables 29 move to each pair of guide shafts 3.
2 and 33 and slid in the direction of the arrow b in FIG. The reel stand center spacing is large l1
automatically adjusted.

At this time, when both reel stands 28 reach the reel stand center position P1, as shown in FIG. 5, one end 29a of both moving stands 29 comes into contact with the stopper 34a of both support stands 34 and is stopped. However, both worm wheels 44 continue to be rotated in the direction of arrow f, and both limiter springs 56 are rotated in the direction of arrow b by both pivot pins 53.
strongly pulled in the direction. When both worm wheels 44 are rotated to a predetermined position and detected by a rotational position detection sensor (not shown), the drive motor 39 is stopped, and the spring force of both limiter springs 56 causes both movable bases 29 to be rotated. is strongly pressed elastically by both stoppers 34a in the direction of arrow b and is positioned. Note that both worm wheels 44 are locked in their stopped positions by both worms 43.

After the interval adjustment operation between the two reel stands 28 is completed, the large cassette 23 is attached to both the reel stands 28 from above as shown by the dashed line in FIG.
A pair of left and right reels in the large cassette 23 are engaged with the reel stand 28.

[Problem that the invention attempts to solve]

However, in this prior invention, each moving platform 2
9 is elastically pressed against each pair of stoppers 43a, 43b for positioning, a pair of limiter springs 51, 56 each consisting of a tension spring is used, which requires a large number of parts and assembly man-hours, and the structure is complicated and costly. It was high. In particular, one of the limiter springs 51 is inserted into the circular recess 49 of the worm wheel 44 by being wound around it in a semicircular arc shape, and the spring force of the limiter spring 51 is increased by the friction against the worm wheel 44. It tends to become high or partially elongate, which tends to cause variations in spring force. Variations in the spring force immediately result in variations in the positioning force of the movable table 29, making the positioning of the movable table 29 unstable. Furthermore, if tension springs are used as the limiter springs 51 and 56, the work of locking these end portions 51a, 51b and 56a, 56b to the locking portions 50, 52 and 53, 55 is extremely troublesome. This locking work is difficult to automate and must be done manually. Furthermore, in order to attach one of the limiter springs 51, a circular recess 49 must be formed in the worm foil 44, and the worm foil 44 must be molded into a complicated shape, resulting in high component processing costs.

The present invention consists of a moving base to which a reel base is attached and configured to be able to reciprocate between a pair of stoppers, and a drive member that is driven by a motor to reciprocate the moving base via a pair of limiter springs. have,
In the reel stand moving device configured to position the moving stand by elastically pressing each stopper with the spring force of each limiter spring, the limiter spring can be configured with one compression coil spring. It is something to do.

[Means to solve problems]

In the reel table moving device, the present invention provides a pair of support parts arranged at intervals in the moving direction of the moving table, and a compression coil spring parallel to the moving direction of the moving table. A pair of pressing members provided between the support portions of and alternately driven by the driving member are brought into contact with both ends of the compression coil spring, and the driving member pushes the compression coil spring through the pair of pressing members. is alternately compressed from both directions to drive the movable table reciprocatingly through the compressive repulsive force, and the movable table is alternately pressed elastically against each of the stoppers by the compressive repulsive force to position the movable table. This is a reel stand moving device characterized by the following.

[Function] According to the present invention, one compression coil spring can be used as a limiter spring for positioning the movable table by elastically pressing the pair of stoppers alternately.

〔Example〕

Hereinafter, a first embodiment will be described in which the present invention is applied to a reel stand moving device of a cassette type video tape recorder.
This will be explained with reference to FIGS. In addition, Figures 4 to 6
The same reference numerals are attached to the same structural parts as those of the prior invention shown in the figure, and the explanation thereof is omitted. Also, Figures 4 to 6
As explained in the figure, the driving mechanisms of the pair of left and right moving tables 29 to which the pair of left and right reel stands 28 are attached are the same (however, they are symmetrical), so here only the driving mechanism of one moving table 29 is used. Explain.

First, a substantially square-shaped support member 1 is attached to one end 29a of the moving table 29, and its pair of support parts 1a, 1
b is fixed at both ends by a pair of set screws 2. The pair of support parts 1a and 1b are arranged parallel to each other with an interval in the moving direction (direction of arrows a and b) of the moving base 29, and the pair of support parts 1a and 1b provided on both support parts 1a and 1b are A moving member 4 made of a rod or the like is inserted between the holes 3 so as to be movable in the moving direction (directions of arrows a and b). Further, one compression coil spring 5 parallel to the moving direction (directions of arrows a and b) of the moving table 29 is inserted into the outer periphery of the moving member 4 and interposed between the supporting parts 1a and 1b. Both ends 5a, 5 of this compression coil spring 5
A pair of pressing members 7 and 8 made of flanged sleeves or the like that alternately press b are inserted into both support holes 3 and movably relative to the outer periphery of the movable member 4. Part (flange) 7
a, 8a are in contact with both ends 5a, 5b of the compression coil spring 5, and are arranged inside both the support parts 1a, 1b. Note that one end 4a of the moving member 4 is configured to have a wide shape so as to be able to drive one of the pressing members 7, and the other end 4b has a contact portion 9 such as an E-ring that drives the other pressing member 7. installed.

On the other hand, the driving member 11 is connected to the worm wheel 44.
The rotary arm is fixed to the upper end of a rotary shaft 45, which is rotated integrally with the rotary shaft 45, by a set screw 12 or the like. A tip 11a of the drive member 11 is connected to one end 4a of the moving member 4 via a link 13 and a pair of pins 14 and 15.

The reel table moving device of the present invention is constructed as described above and operates as follows.

First, as shown in FIG. 1, with the movable table 29 in contact with one of the stoppers 34a, the motor shaft 40 of the drive motor 39 moves in the direction indicated by the arrow d.
When the worm wheel 44 is rotated in the direction of the arrow c by the worm 43, the drive member 11 is rotated in the direction of the arrow c together with the rotating shaft 45, and is moved via the link 13. The member 4 is pushed out in the direction of arrow a. Then, as shown in FIG.
and presses it in the direction of arrow a, and the pressing part 7a of the pressing member 7 presses against the one end 5 of the compression coil spring 5.
Press a in the direction of arrow a. As a result, the compression coil spring 5 is compressed, and this compressive repulsive force is applied to the other end 5.
b is transmitted to the movable stage 29 via the other pressing member 8 and the support part 1b, and the movable stage 29 is moved in the direction of the arrow a through the compressive repulsive force.

As shown in FIG. 3, after the movable table 29 comes into contact with the other stopper 34b and is stopped, the drive member 11 moves from the position indicated by the dashed line to the position indicated by the solid line due to the overrun drive of the worm wheel 44 described above. During this period, the pressing portion 7a of one of the pressing members 7 presses one end 5a of the compression coil spring 5 even more strongly in the direction of arrow a. As a result, the moving table 29 is moved by the compression coil spring 5.
Due to the strong compressive repulsion force, the stopper 34b is strongly pressed elastically in the direction of the arrow a and is positioned.

Next, as shown in FIG. 3, with the movable table 29 in contact with the other stopper 34b, the motor shaft 40 of the drive motor 39 is rotated as indicated by the arrow f.
When the worm wheel 44 is rotated in the direction of the arrow f by the worm 43, the drive member 11 is rotated in the direction of the arrow f together with the rotating shaft 45, and is moved via the link 13. The member 4 is pushed out in the direction of arrow b. Then, as shown in FIG. 2, the contact part 9 of the other end 4b of the moving member 4 contacts the other pressing member 8 and presses it in the direction of arrow b, and the pressing part 8a of the pressing member 8 is compressed. The other end 5b of the coil spring 5 is pressed in the direction of arrow b. As a result, the compression coil spring 5 is compressed, and its compressive repulsive force is transmitted from the end 5a to the movable table 29 via one of the pressing members 7 and the support section 1a, and the compressive repulsive force is transmitted to the movable table 29 via the compressive repulsive force. is moved in the direction of arrow b.

As shown in FIG. 1, after the movable table 29 comes into contact with one of the stoppers 34a and is stopped, the drive member 11 is moved from the position indicated by the one-dot chain line to the position indicated by the solid line due to the overrun drive of the worm wheel 44 described above. During this period, the pressing portion 8a of the other pressing member 8 presses the other end 5b of the compression coil spring 5 even more strongly in the direction of the arrow a. As a result, the moving table 29 is moved by the compression coil spring 5.
Due to the strong compressive repulsion force, the stopper 34a is strongly pressed elastically in the direction of arrow b and is positioned.

Although one embodiment of the present invention has been described above, various effective modifications can be made based on the technical idea of the present invention.

For example, the moving member 4 shown in the embodiment is not necessarily necessary, and in short, when the driving member 11 is driven alternately in the directions of arrows c and f, the driving member 11 moves the pair of pressing members 7 and 8 as shown in the arrows. Any device that can be driven alternately in the a and b directions is sufficient.

Furthermore, the drive member 11 driven by the drive motor 39 is not limited to a rotating arm that is rotated by the rotating shaft 45, but a linear arm such as a rack driven by a pinion. It may be something that is moved back and forth.

Further, the present invention is not limited to a reel stand moving device for a cassette type video tape recorder, but can be applied to reel stand moving devices for various other recording and reproducing devices.

[Effect of idea]

In the present invention, one compression coil spring can be used as the limiter spring that positions the moving table by elastically pressing it alternately against a pair of stoppers, thereby reducing the number of parts and assembly man-hours. It is possible to simplify the structure and reduce costs. In addition, the spring force due to the compressive repulsive force of the compression coil spring that positions the moving table by elastically pressing it alternately against the pair of stoppers is always the same and does not vary at all, so the positioning force of the moving table against the pair of stoppers is There is no variation at all, and the movable table can always be stably positioned relative to the pair of stoppers. Further, the work of inserting the compression coil spring between the pair of support parts is much easier than the work of locking both ends of the tension spring to the pair of locking parts, and the assembly work is extremely simple. Furthermore, as shown in the embodiment, the worm wheel 44 that drives the drive member 11 does not need to be attached with a tension spring at all, and can be formed into a normal, simple shape, thereby reducing component processing costs.

[Brief explanation of the drawing]

1 to 3 are enlarged partially cutaway plan views of essential parts showing an embodiment in which the present invention is applied to a reel stand moving device for a cassette type video tape recorder.
4 to 6 show the invention of the prior application, in which FIG. 4 is an overall plan view, and FIGS. 5 and 6 are enlarged plan views of main parts. Also, in the symbols used in the drawings, 1a...
Support part, 1b... Support part, 5... Compression coil spring, 5a... Both ends of compression coil spring, 5b... Both ends of compression coil spring, 7... Pressing member, 8...
Pressing member, 11... Drive member, 28... Reel stand, 29... Moving stand, 34a... Stopper, 3
4b... stopper, 39... drive motor.

Claims (1)

[Scope of utility model registration request] It has a movable base to which a reel base is attached and is configured to freely reciprocate between a pair of stoppers, and a drive member that is driven by a motor to reciprocate the movable base via a pair of limiter springs. In a reel stand moving device configured to position the stand by elastically pressing it against each stopper by the spring force of each limiter spring, a pair of supports are arranged on the moving stand at intervals in the direction of movement thereof. a compression coil spring parallel to the moving direction of the moving table is provided between the pair of support parts, and a pair of pressing members alternately driven by the drive member are provided at both ends of the compression coil spring. The compression coil spring is alternately compressed from both directions by the drive member through the pair of pressing members, and the movable base is reciprocated by the compression repulsion force, and the compression coil spring is caused to reciprocate by the compression repulsion force. A reel stand moving device characterized in that the moving stand is configured to be positioned by elastically pressing the stoppers alternately.