JPH056743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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 selectively using a plurality of tape cassettes of different sizes. The center distance between the pair of reel stands is automatically adjusted according to the size of the tape cassette that is selectively loaded by moving the pair of reel stands at the same time but in different directions. The present invention relates to a reel stand moving device configured as follows.

[Background technology and its problems]

The applicant of the present invention has already filed, for example, Japanese Patent Application No. 58-148214 (see Japanese Patent Publication No. 4-25620) as a prior invention relating to this type of reel table moving device. In this prior invention, a pair of sliding stands each having a pair of reel stands attached thereto and configured to be slidable along a guide are configured to slide in mutually different directions.
A slide table drive mechanism consisting of a worm driven by a motor capable of forward and reverse rotation, a worm wheel rotationally driven by the worm wheel, and a drive arm that is rotationally driven by the worm wheel and slides the slide table. They were arranged in a symmetrical manner, and the two sets of slide table drive mechanisms were configured to slide the pair of slide tables in mutually different directions.

Therefore, the reel stand moving device of this prior invention is as follows:
Two sets of sliding platform drives were required, making the structure very complex and significantly increasing costs. In addition, in a structure in which the slide table is slid using a rotationally driven drive arm, etc., when the difference in the size of the tape cassettes used is large and a pair of reel stands must be moved over a large distance range. , it was necessary to provide a large movable space for the drive arm, etc., and therefore there was a problem in reducing the size and weight.

[Purpose of the invention]

The present invention aims to provide a reel stand moving device capable of correcting the above-mentioned defects.

[Summary of the invention]

The present invention provides a pair of sliding stands to which a pair of reel stands are respectively attached and configured to be slidable along a guide, and a pair of sliding stands that are wound between a drive pulley and a guide pulley so that the sliding stands can be moved freely along a guide. It consists of at least one linear body such as a wire that is moved along a path, and a motor capable of forward and reverse rotation that drives the drive pulley to move the linear body,
The above-mentioned two sliding stands are respectively locked to the above-mentioned linear body, and both the above-mentioned sliding stands are slid in mutually different directions via the above-mentioned linear body by forward and reverse rotation driving of the above-mentioned motor, and the above-mentioned pair of reel stands are This reel table moving device is configured to automatically adjust the center spacing of the reel table.

According to the present invention configured in this way, it is possible to provide a reel stand moving device that has a very simple structure, is extremely low cost, and is suitable for being small and lightweight.

〔Example〕

An embodiment in which the present invention is applied to a reel stand moving device for a cassette-type video tape recorder will be described below with reference to the drawings.

First, the outline of this reel stand moving device will be explained with reference to FIG.

This reel table moving device has three types of tape cassettes, small, medium, and large (hereinafter simply referred to as small, medium, and large cassettes) C ₁ , C ₂ , and C ₃ that are different in size and are selectively mounted. Match the center spacing of each reel,
The center spacing between the pair of left and right reel stands 1a and 1b is automatically adjusted, and these small, medium, and large cassettes C ₁ , C ₂ , and C ₃ are selectively used by one video tape recorder. It is configured in such a way that it can be done.

However, at that time, the small, medium, and large cassettes C ₁ , C ₂ ,
C ₃ is the front position P ₁ and the center position in the left and right direction
It is configured to be installed in a video tape recorder with the P _{2 and P 2} regulated in the same position.
For this reason, both reel stands 1a and 1b are
Three positions Pa ₁ , Pa ₂ in the Z direction (in the V-shaped direction) in line with the center position of the reel stand, which has different phases in _two directions, the X direction and the Y direction, of the medium and large cassettes C ₁ , C _{2 , and} C 3 ，
By adjusting the movement between Pa ₃ , Pb ₁ , Pb ₂ , and Pb ₃ , the center distance between these two reel stands 1a and 1b is adjusted.
It is configured to adjust to three intervals: l ₁ , l ₂ , and l ₃ .

Next, the details of this reel table moving device will be explained one by one.

First, as shown in FIGS. 2A to 2C, on the chassis 3 of the video tape recorder main body 2, a pair of left and right guide shafts 4a and 4b are horizontally aligned parallel to the Z direction (inverted V direction). It is located in
Both ends of the left and right pairs of guide shafts 4a, 4b are connected to support stands 5a, 5 fixed on the chassis 3.
It is supported on b. Next, both reel stands 1a,
1b is mounted on a pair of left and right sliding stands 6a, 6b. As shown in FIG. 3, these slide tables 6a and 6b have a substantially U-shaped cross section, and a pair of shaft insertion holes 7 provided at both ends of the sliding tables 6a and 6b allow the guide shafts 4a of the left and right pairs to be inserted into each of the slide tables 6a and 6b. , 4b.
Therefore, these sliding tables 6a, 6b are configured to be guided by a pair of left and right guide shafts 4a, 4b and horizontally moved in the Z direction. A pair of reel motors 8a, 8b are fixed to the lower parts of these sliding tables 6a, 6b, and both reel stands 1a, 1b are fixed to the upper ends of motor shafts 9a, 9b of these reel motors 8a, 8b. ing.

Next, as shown in FIGS. 2A to 2C, 4, and 5, a drive pulley 11 and two guide pulleys 12, 13 are placed on the chassis 3 at intermediate positions between the left and right guide shafts 4a, 4b. and a position near the opposite end in a triangular shape. Further, another guide pulley 14 is arranged below the central guide pulley 12. Note that these pulleys 11 to 14 are attached to the pulleys 3 mounted on the chassis 3.
It is rotatably attached to four support shafts 15, 16, and 17, respectively.

A linear body 19 made of a non-stretchable and flexible member such as stainless steel wire is connected to the drive pulley 11 and the three guide pulleys 1.
2 and 13 in an endless manner. Note that this linear body 19 is tensioned without slack by a tensioning tool 20 interposed between its both ends. As shown in FIG. 8, the linear body 19 is wound around the outer periphery of the drive pulley 11 several times and fixed to the drive pulley 11 in a sliding manner. For example, here,
A part of the linear body 19 is inserted into the locking slit 21 formed in the drive pulley 11, and the holding screw 22 is inserted.
The linear body 19 within the slit 21 is fixed by a fixing pin 23 which is pressed by the slit 21.

As shown in FIG. 5, the linear body 19 is moved between the drive pulley 11 and the guide pulley 13 by reversing the conveying direction to different directions at the central upper and lower guide pulleys 12 and 14. It is wrapped around with a ``Tasuki-kake''. Moreover, the linear body 19 as a whole is bent into a substantially mountain shape. And the guide pulley 1 in the upper and lower two stages in the center
Left and right linear path portions 19a between the pulleys 12 and 11 and between the pulleys 14 and 13 of the linear body 19, whose transfer direction is reversed at the 2 and 14 portions so that the linear body 19 is transferred in different directions; 19b is stretched along and parallel to both the left and right guides 4a, 4b. And the left and right straight path portions 19a,
A part of 19b is fixed to one end side of both sliding bases 6a, 6b by a pair of fixtures 24a, 24b.

Next, as shown in FIGS. 2A to 2C, FIG. 4, FIG. 6, and FIG. 7, a linear body driving device 26 is mounted on the chassis 3. This linear body driving device 26 has a mounting base 27, on which the support shaft 15 is vertically fixed, and the drive pulley 11 is rotatably mounted thereon. A rotary drum 28 and a worm wheel 29 are integrally formed at the bottom of the drive pulley 11, and a worm 30 engaged at right angles to the worm wheel 29 is rotatably mounted on a mounting base 27. . Further, a motor 32 that can rotate in forward and reverse directions is attached to one end of the mounting base 27 via a mounting plate 31, and includes a motor pulley 34 fixed to a motor shaft 33 and a worm pulley 36 fixed to a worm shaft 35. A belt 37 is wound between them.

Next, Fig. 2A to Fig. 2C, Fig. 4, Fig. 6 to
As shown in FIG. 8, a reel stand locking device 39 is incorporated into the linear body driving device 26. This reel stand locking device 39 utilizes a rotating drum 28 that is integrally formed at the lower part of the driving pulley 11, which is a rotational driving body, and has a rotating drum 28 formed at intervals on the outer circumference of the rotating drum 28 as shown in FIG. Three engaging parts 40a, 40b, 40 consisting of formed recesses
c, a lock pin 41 that is selectively engaged in these engaging portions 40a, 40b, and 40c to lock the drive pulley 11, and the lock pin drive mechanism 4.
It is composed of 2. In addition, lock pin 4
1 is horizontally passed through a through hole 44 of a lock pin support wall 43 provided integrally with the mounting base 27, and is configured to be able to reciprocate in the axial direction. The lock pin drive mechanism 42 uses a plunger solenoid 45 mounted on the mounting base 27, and its suction rod 46 and the lock pin 41 are connected by a pin 47. In addition, the return spring 48 of the suction rod 46
As a result, the lock pin 41 is always pressed against the outer circumferential side of the rotating drum 28. Further, a micro switch 49 is mounted on the chassis 3 on one side of the plunger solenoid 45, and its actuator 49 is brought into contact with one end of the pin 41.

By the way, this reel stand locking device 39 connects the tip of the locking pin 41 to three engaging portions 40a, 40.
b, 40c and selectively locks the drive pulley 11 at three rotational positions, the two reel stands 1a, 1b are moved through the non-slip linear body 19. Said three positions
It is configured to selectively lock at Pa ₁ , Pa ₂ , Pa ₃ and Pb ₁ , Pb ₂ , Pb ₃ . Therefore 3
The three engaging portions 40a, 40b, 40c are the linear body 19.
The rotation angle of the drive pulley 11 is determined to correspond to the amount of movement of both sliding tables 6a and 6b.

Next, as shown in FIGS. 6 to 8, a reel stand position detection device 51 is incorporated into the linear body drive device 26. This reel stand position detection device 51 uses a magnet 52 embedded in the upper end of the drive pulley 11.
and 3, which is disposed close to the upper part of the magnet 52 and along the rotation locus of the magnet 52.
It is composed of three reed switches 53a, 53b, and 53c. Note that the three reed switches 53a, 53b, and 53c are attached to the lock pin support wall 4.
The switch is attached to the lower part of a switch mounting plate 54 which is fixed to the upper part of the drive pulley 3 and horizontally arranged directly above the drive pulley 11.

By the way, this reel stand position detection device 51 detects three reed switches 53 by means of a magnet 52.
a, 53b, 53c are selectively turned on to detect the three rotational positions of the drive pulley 11, the three positions Pa of both the reel stands 1a, 1b are detected via the non-slip linear body 19. ₁ , _Pa2 , _Pa3
The device is configured to detect Pb ₁ , Pb ₂ , and Pb ₃ . Therefore, three reel switches 53a,
53b and 53c are both sliding tables 6 made of linear bodies 19.
The rotation angle of the drive pulley 11 is determined to correspond to the amount of movement of a and 6b.

Next, the operation of the reel table moving device configured as above will be explained.

First, FIG. 2A shows a state in which both reel stands 1a and 1b are positioned at middle interval positions _Pa2 and _Pb2 corresponding to the middle cassette _C2 . And at this time,
As shown by the solid line in FIG. 9, the tip of the lock pin 41 is engaged with the engaging portion 40b, and the drive pulley 11 is locked at that position. By locking the drive pulley 11, both reel stands 1a and 1b are locked at intermediate distance positions Pa ₂ and Pb ₂ via the linear body 19. At this time, as shown by the solid line in FIG. 8, the magnet 52 is positioned directly below the reed switch 53b, and the reed switch 53b is turned on.

In this state, the middle cassette _C2 inserted into the video tape recorder is placed on both reel stands 1a and 1b, which are locked at middle interval positions _Pa2 and _Pb2 , as shown by the dashed line in Fig. 2A. Well, it will be installed.

Next, when the small cassette C ₁ is inserted into the video tape recorder with both reel stands 1a and 1b locked at the middle distance positions Pa ₂ and Pb ₂ shown in FIG. 2A, Upon detection, the plunger solenoid 45 is first energized. Then, the lock pin 41 is attracted by the suction rod 46 in the direction of the arrow a against the return spring 48, as shown by the dashed line in FIG. The lock is released. At this time, the actuator 49a of the micro switch 49 is pressed by the pin 47,
This micro switch 49 is turned on, and unlocking of the drive pulley 11 is detected.

Then, the motor 32 is driven to rotate forward, for example, and the linear body drive device 26 drives the drive pulley 11.
is rotated in the direction of arrow b in FIGS. 2A and 5. Then, the left and right linear path portions 19a, 19b of the linear body 19 are transferred by the drive pulley 11 in the directions of arrows c and d in FIGS. It is slid in different directions, arrows Zc and Zd in FIG. 2A.

As a result, both reel stands 1a, 1b are at the intermediate interval position.
From Pa ₂ and Pb ₂ , as shown in Figure 2B, the small cassette
It is moved to the small interval positions Pa ₁ and Pb ₁ corresponding to C ₁ .

By the way, as the drive pulley 11 rotates in the direction of the arrow b, the magnet 52 and the engaging portion 40a are moved in the direction of the arrow b, as shown in FIGS. 8 and 9. Note that by moving the magnet 52 in the direction of arrow b, the reed switch 53b is turned off.
When both reel stands 1a and 1b reach the small distance positions Pa ₁ and Pb ₁ as shown in Fig. 2B, the magnet 52 reaches the position directly below the reed switch 53a as shown by the dashed line in Fig. 8. Then, the reed switch 53a is turned on, and the rotational position of the drive pulley 11 is detected. At the same time, the engaging portion 40a reaches the engaging position with the lock pin 41.

However, at this time, the reed switch 53a (as well as the other reed switches) is turned on a little before the magnet 52 reaches the position directly below it, so
The reed switch 53a is turned on a little before both reel stands 1a and 1b reach the small interval positions Pa ₁ and Pb ₁ .
Then, the rotational position of the drive pulley 11 is detected.

Then, the plunger solenoid 45 is de-energized and the return spring 48 pushes the lock pin 41 in the direction of arrow e in FIG.
The tip thereof is elastically brought into contact with the outer periphery of the rotating drum 28. At the same time, the motor 32 is decelerated so that the lock pin 41 can easily operate.

Then, both reel stands 1a and 1b are positioned at a small interval.
At the moment when Pa ₁ and Pb ₁ are reached, the lock pin 41 is further pushed out in the direction of arrow e by the return spring 48 to the position shown by the solid line in FIG. engaged.

As a result, the drive pulley 11 is locked by the lock pin 41, and both reel stands 1 are moved through the linear body 19.
a and 1b are locked at small interval positions Pa ₁ and Pb ₁ . The moment the drive pulley 11 is locked by the lock pin 41, the pin 47 releases the actuator 49a of the micro switch 49, turning the micro switch 49 OFF.
As a result, locking of the drive pulley 11 is detected and the motor 32 is stopped.

However, as described above, both reel stands 1a, 1b
The moving operation is from the time when the small cassette _C1 inserted into the video tape recorder is detected until just before this small cassette _C1 is loaded onto both reel stands 1a and 1b.
~2 seconds, and the small cassette _C1 is
As shown in Figure 2B by the dashed line, the position is at a small interval.
After being moved to Pa ₁ and Pb ₁ and locked, it is mounted on both reel stands 1a and 1b.

Next, when the large cassette C ₃ is inserted into the video tape recorder with both reel stands 1a and 1b locked at the middle distance positions Pa ₂ and Pb ₂ shown in FIG. 2A, Upon detection, the plunger solenoid 45 is energized as described above.
Then, the drive pulley 11 is unlocked by the lock pin 41, and the motor 32 is rotated, for example, in the reverse direction, so that the drive pulley 11 is rotated in the direction of arrow f in FIGS. 2A and 5. Then, this time, both the left and right straight path portions 19a, 1 of the linear body 19
9b is transferred in directions of arrows g and h which are different directions from each other, and both reel stands 1a and 1b are moved in the directions of arrows g and h which are different from each other through both sliding stands 6a and 6b.
In figure A, it is slid in the directions of arrows Zg and Zh.

As a result, both reel stands 1a, 1b are at the intermediate interval position.
From Pa ₂ , Pb ₂ to the large cassette as shown in Figure 2C.
It is moved to large interval positions Pa ₃ and Pb ₃ corresponding to C ₃ .

Then, as shown in FIGS. 8 and 9, the magnet 52 and the engaging portion 40c are respectively moved in the direction of the arrow f, and the magnet 52 is moved to a position directly below the lead chain 53c, as shown by the two-dot chain line in FIG. At the same time, the engaging portion 40c is moved to the engaging position with the lock pin 41.

Then, as described above, the reed switch 53c is turned on a little before both reel stands 1a and 1b reach the large interval positions Pa ₃ and Pb ₃ , and the drive pulley 1
1 rotational position is detected. Then, the plunger solenoid 45 is de-energized, and both reel stands 1
At the moment when a and 1b reach the large interval position Pa ₃ and Pb ₃ ,
The tip of the lock pin 41 is engaged in the engaging portion 40c, and the drive pulley 11 is locked. At the same time, the motor 32 is stopped.

The large cassette _C3 inserted into the video tape recorder is as shown by the dashed line in Fig. 2C.
After being moved to the large interval positions Pa ₃ and Pb ₃ and locked, they are mounted on both reel stands 1a and 1b.

Note that both reel stands 1a and 1b are placed at a small interval.
From Pa ₁ , Pb ₁ to large interval position Pa ₃ , Pb ₃ and vice versa from large interval position Pa ₃ , Pb ₃ to small interval position Pa ₁ ,
When moving to Pb ₁ at once, move to the middle interval position.
The system is controlled so that the driving reel 11 is not locked at Pa ₂ and Pb ₂ .

Although the embodiments of the present invention have been described above, various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, one linear body 19 was wound between the pulleys using a "taski hook", but two linear bodies 19 were wound between the pulleys so as to be transferred in opposite directions. It can also be used.

Furthermore, various effective structures other than those shown in the embodiments can be adopted for the guide structure of the slide tables 6a, 6b, the linear body drive device 26 using the motor 32, and the like.

Further, the center spacing between the reel stands 1a and 1b can be adjusted to many spacings greater than the three spacings shown in the embodiment.

[Application example]

The present invention is not limited to a reel stand moving device for a cassette type video tape recorder, but is applicable to reel stand moving devices for various other recording/reproducing devices and information processing devices.

〔Effect of the invention〕

As described above, the present invention transports a linear body by rotationally driving a drive pulley with a motor, and causes the linear body to slide on a pair of sliding bases. Since it is configured to automatically adjust the distance between the centers of the pair of attached reel stands, the structure is very simple and the cost is extremely low. In addition, by simply winding the linear body over a long distance range, the pair of reel stands can be easily moved over a large distance range, and the moving space of the linear body can be made very small, making it compact and compact. , which is ideal for weight reduction. Furthermore, the structure in which the pair of sliding bodies are slid by the transfer of the linear body has little variation in driving torque, and the pair of sliding stands can be slid easily with a stable driving torque from beginning to end.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a reel stand moving device for a cassette type video tape recorder, in which FIG. 1 is a plan view illustrating a method of moving the reel stand, and FIGS. 2A to 2C. The figure is a plan view of the entire device to explain the movement status of the reel stand, FIG. 3 is an enlarged sectional view taken along the line of FIG. 2A, FIG. 4 is an enlarged side view taken along the arrows of FIG. 2A, and FIG. 6 is an exploded perspective view of the linear object driving device, FIG. 7 is an enlarged cross-sectional view taken along the line 2A, and FIG. Figure-
FIG. 9 is an enlarged sectional view taken along the lines of FIG. 7. Also, in the symbols used in the drawings, 1a, 1
b...Reel stand, 4a, 4b...Guide shaft, 6
a, 6b...Sliding base, 11...Drive pulley, 1
2, 13, 14... Guide pulley, 19... Linear body, 26... Linear body drive device, 32... Motor.

Claims (1)

[Claims] 1. A pair of sliding stands to which a pair of reel stands are respectively attached and configured to be slidable along a guide;
At least one linear body such as a wire, which is wound between a drive pulley and a guide pulley so as to be moved along the sliding path of both the sliding bases; It consists of a motor that can rotate in forward and reverse directions to move the linear body, and both of the sliding bases are respectively locked to the linear body, and both the sliding bases are rotated in the forward and reverse directions through the linear body by the forward and reverse rotation driving of the motor. A reel stand moving device configured to automatically adjust the center distance between the pair of reel stands by sliding the moving stands in different directions.