JPH034980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette storage device for a magnetic recording/reproducing device or the like. In recent cassette-type VTRs, the cassette is inserted into the cassette holder inside the main body through the cassette insertion slot on the front of the VTR, where various operation switches are located, and the cassette is moved together with the cassette holder to the installation position, where it is set and recorded. A cassette storage device using a so-called front loading method has been proposed, which allows operations such as playback and playback. In the above-mentioned cassette storage device, the cassette holder is normally moved to operate a switch to control the energization of the drive motor. Since the drive motor is energized at the position,
If the electricity is cut off at this position during the cassette ejection operation, it will be difficult to remove the cassette. For this reason, when ejecting the cassette, it is necessary to facilitate ejection of the cassette by cutting off the current at a position further moved from the position where the drive motor is energized when the cassette is installed. Normally, for this purpose, it is necessary to provide three switches for detecting the insertion, loading and ejection of the cassette, and to operate them in conjunction with the movement of the cassette holder to control the drive motor. The present invention was made in view of the above points, and by combining the operating states of the two switches,
The object of the present invention is to provide a cassette storage device that can meet the above requirements. An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is an exploded perspective view of the cassette storage device;
The figure shows an outer side view of the left side plate, FIG. 3 shows an inside side view of the left side plate, and FIG. 4 shows a side view of the drive mechanism. 1 and 2 are a pair of left and right side plates, 3, 4, and 5 are a top plate, a bottom plate, and a back plate that connect these left and right side plates;
These constitute a frame, which is fixed to a chassis (not shown) of the VTR body. A cassette holder 6 is movably supported on this frame, and this cassette holder can hold a cassette (not shown) when it is in a position facing an insertion opening formed on an operation panel (not shown). The cassette holder 6 has bent pieces 6b and 6c rising from both ends of the bottom 6a to position the cassette at a predetermined position. Furthermore, the cassette holder 6
A pair of torsion springs 6 are mounted on the side plates 6d, 6d.
A pair of cassette holding levers 6f and 6f are provided which are urged downward by levers e and 6e to hold the cassette in a predetermined position while the cassette holder 6 is moving. Reference numeral 7 denotes a prevention plate for preventing incorrect or double insertion of the cassette, and is supported by cutouts 1a and 2a provided in the left and right side plates 1 and 2 so as to be rotatable at a predetermined angle. This prevention plate 7 has a tongue piece 7b which is inclined downward at a predetermined angle with respect to the base part 7a, and the tip part 7c of this tongue piece is curved upward. Furthermore, projecting pieces 7d, 7d are provided continuously at the end of the base 7a, which engage the cassette holding levers 6f, 6f before and after the start of horizontal movement of the cassette holder 6 , and hold the base 7a in a horizontal state. Keep it. Reference numeral 8 denotes a door that prevents foreign objects from being inserted into the cassette insertion slot, and is rotatably supported on a rotation shaft 8a between the left and right side plates 1 and 2 , and can be opened and closed inward.
It is normally biased toward the closed state by a torsion spring 8b. The opening and closing of this door is controlled by a door opening/closing lever which will be described later. 1b, 2b are L-shaped first guide grooves formed in the left and right side plates 1 , 2 , into which first guide rollers 6g, 6g provided on the side plates 6d , 6d of the cassette holder 6, respectively, are loosely fitted. , this cassette holder 6 is movable horizontally and vertically.
The guide groove 1b on the inside of the left and right side plates,
There are two pairs of guide plates 1 on each side of the horizontal part of 2b.
c, 1c and 2c, 2c are provided to guide the second guide rollers 6h, 6h of the cassette holder 6 . The interval between the guide plates is slightly wider than the width of the first guide groove. 1d and 2d are elevating guide plates that guide the second guide rollers 6h, 6h continuously to the guide plate and are movable up and down. Each of these lifting guide plates has a U-shaped guide portion 1 having a width equal to the distance between the pair of guide plates.
e, 2e are formed. Further, this elevating guide plate is integrated with slide plates 1g and 2g via second guide grooves 1f and 2f formed to extend vertically in the left and right side plates 1 and 2, respectively, to constitute an elevating mechanism. ing. This lifting mechanism uses coil springs 9, 9
The guide portions 1e, 2e are normally urged upward by the guide plates 1c, 1.
c, 2c, and 2c, that is, in the raised position. Reference numerals 10 and 11 indicate main gears that are supported by first support shafts 1h and 2h that project inwardly from the side plates 1 and 2, respectively, and are driven by a drive mechanism that will be described later. Near the outer periphery of this main gear are the side plates 1 and 2 .
Guide pins 10a and 11a are provided which loosely fit into arc-shaped third guide grooves 1i and 2i, respectively. 1j and 2j are second support shafts that protrude outward from the side plates 1 and 2 , and are located at different positions from the first support shafts 1h and 2h that project inward, that is,
It is located at the bottom. First pivot levers 12 , 12 and second pivot levers 13, 13 are pivotally supported on the second support shafts 1j, 2j, respectively. This first rotation lever includes the first guide groove 1b,
U-shaped notches 12a, 12a into which the first guide rollers 6g, 6g are loosely fitted via 2b, and approximately L into which the guide pins 10a, 11a are loosely fit through the third guide grooves 1i, 2i. Letter-shaped through hole 12
b, 12b are formed, and the main gear 10 ,
The cassette holder 6 can be rotated in conjunction with the rotation of the cassette holder 11 to move the cassette holder 6 . Coil springs 14, 14 are stretched between the first and second rotating levers and act to bias the cassette holder 6 downward at the mounting position of the cassette holder 6;
Normally, the first and second rotating levers are engaged with each other and are integrated by the biasing force of the coil spring. 15 is a drive shaft communicating between the left and right side plates 1 and 2 , and drive gears 15a and 15a are provided at both ends, respectively.
is arranged, and this drive gear is the main gear 1.
Drives 0 and 11 . A spring holder 16 is provided at the further end of the drive gear 15a at the right end of the drive shaft.
is arranged, and a torsion spring 17 is wound around this. Reference numeral 18 denotes a bracket attached to the right side plate 2 , and this bracket includes a drive motor 19, a pulley 21 connected to the drive motor by a belt 20, a worm 22 arranged coaxially with this pulley, and this worm. A worm wheel 23 is attached which meshes with the worm wheel 23 . The worm wheel 23 is provided with a second rib 23a that can engage with the first rib 16a provided on the spring holder 16 , and these ribs are normally engaged by the torsion spring 17. The cassette holder 6 is always urged toward the insertion port with respect to the worm wheel 23 . Then, when the cassette holder 6 is pressed in the mounting direction against the bias of the torsion spring 17 while the worm wheel 23 is stopped,
The engagement between the first and second ribs 16a and 23a is released. 24 is the second support shaft 2 of the right side plate 2.
This is a stopper lever that is rotatably supported on the shaft, and the through hole 24a provided in this stopper lever is
The bent piece 12c of the first rotating lever 12 is loosely fitted into the lever, and a coil spring 25 is stretched between the levers, so that the levers are normally integrated, but the coil spring against the force of
It is possible to push both levers apart. The end of this stopper 24 engages with the second rib 23a of the worm wheel 23,
Locking piece 2 that restricts the rotation of this worm wheel
4b is provided. The left side plate 1 has first and second switches SW.
1, SW2 is provided to detect insertion, mounting, and ejection of a cassette. The first and second switches are first and second slide levers 26 and 27 supported by support shafts 1k and 1l arranged inside the left side plate 1 .
controlled by The first slide lever 26 has elongated holes 26a and 26 into which the city shafts 1k and 1l loosely fit.
It is capable of sliding only in the horizontal direction where b is formed, and a pressing piece 26c for pressing the first switch SW1 is provided at the tip. Further, the second slide lever 27 is formed with a long hole 27a into which the support shaft 1l is loosely fitted, and a substantially rectangular through hole 27b into which the support shaft 1k is loosely fit. It can be rotated by a predetermined angle around 1l, and a pressing piece 27c for pressing the second switch SW2 is provided at the tip. Further, 28 is a coil spring that biases the rotating end of the second slide lever upward. The first and second slide levers 26 and 27 are slid by first and second engagement pins 10b and 10c provided through the main gear 10 , which are connected to the first and second slide levers 26 and 27. This is done by engaging with the provided engagement piece 26d and recesses 27d and 27e. Further, since the portions of the first and second slide levers into which the support shafts 11 are loosely fitted are held by flat washers 30, 30, 30, 30 which are biased by the seat springs 29, both the slides After the lever is slid by the engagement of the first and second engagement pins 10b and 10c, these engagement pins 10
Even if b and 10c are separated, their sliding positions are maintained. Further, 31 is a door opening/closing lever for opening and closing the door, and is rotatably supported on a support shaft (1 m) of the left side plate 1 . An engagement pin 31a that engages with the left end 8c of the door 8 is disposed at the tip of the lever 31, and when rotated counterclockwise in FIG.
opens. Further, this lever 31 is formed with a cam portion 31b that can be engaged with a protruding pin 12d provided on the first rotating lever 12.
The rotation of the rotation lever 12 causes the door 8 to be rotated so that it is normally closed and opened only when a cassette passes below the door 8 . Next, the operation of the apparatus of the present invention will be explained according to FIGS. 5A to 5D. First, the cassette mounting operation will be explained. FIG. 5A shows the state before the cassette is inserted, and the door 8 is biased to the closed state, but can be opened by external pressure. The first and second pivot levers 12 and 13 are held together by the bias of a coil spring 14, and this state is maintained until the cassette mounting position. The first guide roller 6g guided by the notch 12a of the first rotating lever 12 is located at the left end of the first guide groove 1b, and the cassette holder 6 is in a position where it can receive a cassette. In this position of the cassette holder 6 , the protruding piece 7d of the prevention plate 7 is engaged with the cassette holding lever 6f, so the angle of inclination is small.
The tongue piece 7b is located above the cassette insertion path. In addition, the first and second slide levers 26 and 27
is at a position slid to the right from the first engagement pin 10b of the main gear 10 , and the first and second switches
SW1 and SW2 are each closed. Next, when the cassette 32 is inserted through the insertion slot as shown in FIG. . When the cassette 32 is further pressed, the cassette holder 6 moves slightly to the right. In conjunction with this, the first
The rotation lever 12 and the main gear 10 rotate clockwise. Then, the rotation of the main gear 10 causes the first engagement pin 10b to slide the second slide lever 27 to the left, thereby closing the second slide SW2. At this time, the first slide lever 26 is held at its original position by the aforementioned seat spring and flat washer, and the first switch SW1 remains in the closed state. Here, the first and second switches SW1, SW2
When either of them is in an open state, the drive motor is energized by a switch circuit to be described later, and when both are in the same state, the energization is cut off. Therefore, as described above, by opening only the second switch SW2, the drive gear 15a rotates counterclockwise, the main gear 10 begins to rotate clockwise, and the cassette holder 6 is moved to the cassette position. 32 placed thereon, it is guided by the first rotating lever 12 and moves to the right. When inserting the aforementioned cassette, the prevention plate 7
comes into contact with the slope 32a of the cassette 32 , and the slope 32
a and rides on the upper surface of the cassette to allow insertion of the cassette 32 , but the cassette 32
If the cassette 32 is inserted face down or sideways, the side wall of the cassette 32 will come into contact with the tip 7c of the prevention plate 7 , making it impossible to push up the prevention plate 7 and inhibiting insertion. When the cassette holder 6 further moves to the right, as shown in FIG. The roller 6g reaches the bent portion of the first guide groove 1b and is located within the guide portion 1e of the elevating guide plate. In this state, the door opening/closing lever 31 is
It is in a clockwise rotated position due to the rotation of the protruding pin 12d on the first rotation lever 12 that is engaged with the lever 1b, and keeps the door 8 open. On the other hand, after the prevention plate 7 is separated from the upper surface of the cassette 32 , it stops at a position slightly rotated counterclockwise, and the tip end 7c is located near the approximate center of the cassette insertion path. Therefore, even if you try to insert another cassette 33 in this state, the tip end 7c will not fit into the cassette 33 .
Since it does not come into contact with the inclined portion 33a of , but comes into contact with the front wall 33b, insertion is prohibited. Further, as the main gear 10 rotates from this state, the first and second guide rollers 6g and 6h descend while riding on the elevating guide plate 1d. Then, as shown in FIG. 5D, the first guide roller 6g
The cassette holder 6 is guided in the above-described state to the device position where the cassette holder 6 reaches the end of the first guide groove 1b. During the above-mentioned vertical movement, the protruding pin 12d of the first rotating lever 12 touches the cam portion 31 of the door opening/closing lever 31.
In order to move away from the door 8, the door opening/closing lever 31 rotates counterclockwise to close the door 8 . On the other hand, when the cassette holder 6 reaches the mounting position, the second engagement pin 10c of the main gear 10 engages with the engagement piece 26d of the first slide lever 26 , causing the lever to slide to the left. Switch SW
1 is in an open state. Therefore, the power supply to the drive motor is cut off, and the rotation of the main gear 10 is stopped. At this time,
The second engagement pin 10c is connected to the second slide lever 2.
It fits into the recess 27e of No.7. Further, just before the cassette holder 6 reaches the mounting position, the guide pin 10a that is engaged with the through hole 12b of the first rotating lever 12 is separated from the side wall of the through hole 12b, and a part of it is inside the through hole. The first rotating cassette 12 engages with the located second rotating lever 13, and guides the first guide roller 6g to the end of the first guide groove 1b while being pulled by the second rotating lever 13. . Therefore, the first rotating lever 12 stops at this point, but the second rotating lever 13
The lever rotates for a short time until it stops, and then stops, so both rotating levers 1 , which were previously integrated,
2 and 13 stop at a slight distance apart. Therefore, in the installed state, the first rotating lever 12 is biased toward the first rotating lever 12 by the coil spring 14, and the cassette holder 6 is biased downward, so that the cassette 32 is It is urged downward via the presser lever 6f. Next, the cassette ejection operation will be described. first,
If you perform the eject operation from the state shown in Figure 5 D,
A cassette eject switch (not shown) of a switch circuit (described later) is closed, and the first and second switches are closed.
Even though both SW1 and SW2 are open, the drive motor is energized and begins to rotate in the opposite direction from when it is installed. Therefore, the main gear 10 rotates counterclockwise, and the second engagement pin 10c slides the second slide lever 27 to the right, and the second switch is activated.
Only SW2 is closed. It should be noted that the operations of the mechanisms other than the first and second slide levers when the cassette is ejected are simply the opposite of those when the cassette is installed, so a description thereof will be omitted. Then, the main gear 10 rotates and the first engagement pin 1
Just before 0b reaches the position shown in Figure 5A, the first
The first slide lever is engaged with the engagement piece 26d of the slide lever 26 to slide the first slide lever to the right.
Close switch SW1 to cut off power to the drive motor. In this state, the first guide roller 6g has been guided to the starting end of the first guide groove 1b, and the position of the cassette holder 6 when the drive motor is energized when the cassette is installed is different. This is because when the cassette is installed, it is necessary to push the cassette 32 to the position where the drive motor is energized, and in the energized position, the rear end of the cassette reaches near the insertion slot, so when the cassette is ejected, the cassette 32 is not energized at this position. This is because if it is cut off, it will be difficult to remove the cassette 32 . Next, the stopper lever 24 in the device of this embodiment
The operation will be explained with reference to FIG. The stopper lever 24 is biased counterclockwise with respect to the first rotating lever 12 by a coil spring 25, and normally rotates together with the first rotating lever 12 . Then, when the drive shaft 15 rotates clockwise to eject the cassette, the locking piece 24b of the stopper lever 24 engages with the spring holder 16 just before ejection due to the counterclockwise rotation of the first rotating lever 12 . Although the stopper lever 24 stops rotating,
The first rotating lever 12 rotates a little further and stops rotating when the first guide roller 6g reaches the starting end of the first guide groove 1b. In this state , the second rib 23a provided on the worm wheel 23 is connected to the locking piece 24b.
It stops at the position where it touches. During normal operation, as described above , even if the stopper lever 24 is not provided, there is no particular problem because the power to the drive motor is cut off when the first guide roller 6g reaches the starting end of the first guide groove 1b. However, if ejection of the cassette is prevented for some reason just before ejecting the cassette, the first rotating lever 12
The counterclockwise rotation of the drive shaft 15 stops, and the rotation of the drive shaft 15 also stops. However, the worm wheel 23 resists the bias of the torsion spring 17 and the spring holder 1
6's first rib 16a and the worm foil 23 's second rib 16a.
Since the ribs 23a are spaced apart and can rotate, the worm wheel would rotate beyond the predetermined stopping position if the stopper lever 24 were not present. There is a possibility that an excessive force is applied to the torsion spring 17 and the torsion spring 17 is deformed. For this reason, in the device of this embodiment, the stopper lever 24 is provided to stop the drive shaft 15 , and the worm wheel 23
Even if the worm wheel 23 rotates by a certain amount, the worm wheel 23 is stopped at a predetermined position. Next, the switch circuit in this embodiment will be explained with reference to FIG. First, before the cassette is inserted, both the first and second switches SW1 and SW2 are in the closed state, that is, the movable pieces are in a state where they are each tilted toward the contact a side, as described above. In addition, the cassette eject switch SW3 is closed in conjunction with the eject operation.
is in the open state and has fallen to the contact b side. When the cassette is inserted from this state, the second switch SW2
switches to contact b side. Therefore, the drive motor 19
Current flows in the positive direction and rotates in the normal direction. When the cassette installation is completed, the first switch SW1 switches to the contact b side, and the drive motor 19
Power is cut off. Furthermore, when the cassette is ejected, the cassette eject switch SW3 is switched to the contact a side by ejecting the cassette for a predetermined period of time, and a current flows in the opposite direction to the drive motor 19, causing the drive motor 19 to reverse direction. Immediately after the drive motor 19 is started, the second switch SW2 switches to the contact a side, so even if the eject operation is subsequently released and the cassette eject switch SW3 switches to the contact b side, the drive motor 19 continues to rotate in reverse. Then, when the cassette has been ejected, the first switch is turned on.
SW1 switches to the contact a side, power to the drive motor 19 is cut off, and each switch returns to its initial state. Next, the operation of the switch circuit in the device of this embodiment when detecting dew condensation will be explained. 1st switch
There is a relay switch RL between SW1 and the DC power supply.
is inserted, and this relay switch is normally closed and satisfies the operation of the switch circuit described above. However, if condensation occurs inside the VTR body, for example on the circumference of the guide cylinder, the guide will normally close. A dew condensation sensor 34 provided on the circumferential surface of the cylinder detects road condensation and outputs an output, and this detection output is input to the system control circuit 35, which supplies a cassette installation prohibition command to the relay switch RL, which then outputs an output. Open. Therefore, when dew condensation occurs, the relay switch RL is always in the open state, so even if an attempt is made to insert the cassette, the drive motor 19 is not energized. As described above, according to the present invention, only two switches are required to operate in conjunction with the movement of the cassette holder, and the number of parts can be reduced and the switch circuit can be simplified, which is highly effective. . At the start of cassette insertion, the second switch is actuated by the displacement of the second displacement member to drive the drive motor, and at the end of cassette ejection, the first
By stopping the drive motor by activating the first switch due to the displacement of the displacement member, the drive motor stops at the drive motor operating position at the start of cassette insertion and at the drive motor stop position at the end of cassette ejection. The drive motor is stopped at a position where the cassette is more ejected to the outside. With this configuration, it is easy to pull out the cassette with your fingers when the cassette has been ejected.

[Brief explanation of the drawing]

The drawings all relate to a cassette storage device according to an embodiment of the present invention; FIG. 1 is an exploded perspective view of the device of this embodiment, FIG. 2 is an external view of the left side plate, and FIG. 3 is an inside view of the left side plate. , Figure 4 is a side view of the drive mechanism,
5A, 5B, 5C and 5D are explanatory diagrams of the operation of the apparatus of this embodiment, FIG. 6 is an explanatory diagram of the stopper lever, and FIG. 7 is a diagram showing an embodiment of the switch circuit. Explanation of main drawing numbers, 1 ...Left side plate, 10 ...Main gear, 10b, 10c...First and second engagement pins,
26, 27 ...first and second slide levers, 2
9... Seat spring, 30, 30, 30, 3
0... Flat switch, SW1, SW2... First and second switch.

Claims (1)

[Claims] 1. Insert the cassette into the cassette holder of the main body from the cassette insertion opening at the first position, move the cassette to the second position while holding it with the cassette holder, and record and play back at the second position. The cassette storage device is configured to operate as follows: a rotating plate that rotates in response to the driving force of a drive motor to control the movement of the cassette holder, and a first and a second rotating plate that are independently displaced. a displacement member, an engagement member provided on the rotary plate that controls movement of the first and second displacement members, and first and second switches that are respectively actuated by displacement of the first and second displacement members. At the start of cassette insertion, the second switch is actuated by the displacement of the second displacement member to drive the drive motor, and when the cassette ejection is finished, the first switch is activated by the displacement of the first displacement member. A cassette storage device characterized in that a drive motor is stopped by operating the cassette storage device.