JPS6120066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic changing device (hereinafter referred to as changer) for automatically changing the tape cassette of a cassette type video tape recorder (hereinafter referred to as VTR).

An object of the present invention is to provide a changer that can be easily attached to an existing VTR without requiring any changes.

A cassette type VTR 1 to which the changer of the present invention can be applied has a cassette holder 11 on its upper surface for holding a cassette 19, as shown in FIGS. 1 and 2, and a mode selection screen on the front surface thereof. It has operation buttons 14 for performing the operations. The cassette holder 11 has an opening 12 for inserting and ejecting a cassette on the front surface, and a tape outlet 13 on the rear surface, and rises to protrude from the top panel when inserting or ejecting a cassette. After inserting a cassette, when this holder is pushed down, a tape loading device (not shown) inside the VTR automatically operates, the tape is pulled out from the drawer opening, and wound around a rotating head drum (not shown). Standby for mode operations such as playback or recording. By manually pressing an operation button such as playback or recording, the operation of that mode is immediately performed. The button pressed at this time is self-maintained (locked) in that state. The operation progresses in this manner, and when the tape end is reached, the operation is automatically terminated, the locked button is released, and the pressed button is automatically reset. Even if the stop button is pressed during the operation before reaching the tape end, the operation will end and the locked button will be released. When the eject button is pressed manually while the tape is stationary, the tape loading device is activated, unloading the tape (returning the ejected tape to the cassette), and then unloading the tape into the cassette. The holder will automatically rise and the cassette can be replaced.

In order to control the above-mentioned VTR, the changer according to the present invention has a basic configuration of covering the cassette holder section and operation button section of the VTR, detecting their states, and applying mechanical output. That is, one embodiment of the present invention will be described with reference to the drawings.
A mounting part 3 for attaching to the VTR body 1 and a magazine part 4 for storing tape cassettes.
and in relation to the manually operated push button 501.
An operating section 5 having a mechanism for operating the push button 14 on the VTR main body, an insertion/ejection section 6 for inserting and ejecting a cassette into a cassette holder, a push-down section 7 for pushing down the holder, and controlling each of the above-mentioned sections. It is comprised of a control circuit section 8 for the purpose of operation, and one motor 9 that serves as a power source for each of the above-mentioned sections.

Each part is controlled by the push buttons on the changer.
This is done by detecting the position of the cassette, the state of the VTR push button, the state of the cassette holder, etc. For this purpose, three switches 803, which detect when each push button of the changer is pressed,
804, 805, a switch 807 for detecting the position of the cassette, and switches 808 to 811 for detecting the position of the insertion/ejection device for inserting and ejecting the cassette into the cassette holder, respectively.
A switch 812 for detecting that the cassette holder of the VTR is in the raised position, a switch 813 for detecting the depressed state, and a switch 806 for detecting the state of the push button on the VTR body are provided. There is also a switch 802 that detects the presence of a cassette in the magazine, and a switch 802 that detects the presence of a cassette in the magazine.
A switch 814 that detects that it is attached to the VTR main body 1 and a switch 801 that detects the state of the attachment lever are provided.

The control circuit unit 8 controls the normal rotation, reverse rotation, and stop of the motor 9, and controls the six electromagnetic plungers 891 to 8.
96 controls are performed. Plunger 891 is for the cassette dropping device, plunger 892 is for mode selection, plunger 893 is for ejecting, plunger 894, 895 is for driving the cassette insertion/ejection device, and plunger 896 is for starting the pressing operation of the cassette holder. be. Among these plungers, plunger 89 for mode selection
2. Plunger 893 for ejecting, plunger 894, 895 for driving the cassette insertion/ejection device, plunger 89 for starting the pressing operation of the cassette holder
Reference numeral 6 is for driving a kind of clutch that controls the transmission of the rotational force of the motor 9 to each part.

Next, the configuration and operation of each of the above parts will be explained in detail.

[Mounting part]

The attachment part 3 for attaching the changer 2 to the VTR body 1 includes an attachment part 31 for attaching it to the rear end of the top surface of the VTR 1, and two attachment parts 32 for fixing it to two places on the front bottom of the VTR body 1. It is made up of The mounting part 31 has a lever 311,
By tilting this lever 311 in the direction of the arrow,
The engaging claw 314 is engaged with the groove 16 on the rear end of the upper surface of the VTR main body 1 via the link 313. In this way, the changer 2 is fixed at the rear of the top surface of the VTR 1. At this time, the lever 311 biases the removal detection switch 801. At this time, the attachment detection switch 814 is energized by the top panel of the VTR main body 1.

The mounting portion 32 has a slidable engagement piece 321, which is caused to protrude in the direction of the arrow by operating a knob 322, and is engaged with the front lower bottom surface 15 of the VTR main body 1.

[Magazine section]

As shown in FIGS. 2 and 3, the magazine section 4 is composed of a square cylindrical cassette storage section 402 having a cassette insertion opening 401 on the front surface, in which several cassettes 19 are stacked one on top of the other. It can be stored. Cassette 19 located at the bottom end
is locked by a lower claw 413 of the claw member 41.

The claw member 41 consists of a member 411 having an upper claw 412 and a lower claw 413, and is rotatably attached around a shaft 414. This member 4
11 is a link 415 via pins 421 and 422
This link 415 is connected to the spring 41
6 in the direction of the arrow. Therefore, each of the lower pawls 413 normally protrudes and holds the cassette located at the lowest end.

Link 415 is connected via pin 419 to link 417 which is rotatable about axis 418 . Link 417 is connected to the output shaft of plunger 891 by pin 420. When the plunger 891 operates and its output shaft is pulled in the direction of the arrow, the link 417 rotates in the direction of the arrow, so that the link 415 is moved in the opposite direction (in the direction of the arrow) to the direction of biasing by the spring 416. , so that both lower pawls 413 are retracted and both upper pawls 412 are protruded accordingly. Protruding upper claw 41
2 engages in a groove provided in the side of the cassette 19 immediately above the lowest cassette 19. Therefore, only the cassette located at the lowest end falls. When the plunger 891 stops operating, the claw member 4
11 returns to its original position as shown in FIG. 3, so that the stacked cassettes 19 are held lowered by one cassette as shown in FIG.

Note that the dropped cassette 19 causes the cassette drop detection switch 807 to operate. Further, a detection switch 802 detects the presence of the lowest cassette 19 held by the claw member 411.

[Operation unit]

As shown in FIG. 4, the operation section 5 mechanically operates the operation button 14 on the VTR main body side in response to the operation of the operation button 501 on the changer side. The operation buttons are arranged in the same way on the changer and VTR, and are arranged so that seven modes can be selected from the left: eject, rewind, stop, play, fast forward, record, and dubbing, as shown in Figure 4. There is. Among these modes, there are five mode selection buttons: rewind, playback, fast forward, recording, and dubbing (these five buttons will be referred to as mode selection buttons to distinguish them from the stop button and exit button described later). ) is transmitted from the chainer side to the VTR main body side via the plunger 892. The detector 803 detects when any of the mode selection buttons is operated.

These five mode selection buttons are locked when pressed, and when the plunger 892 operates, the button on the VTR corresponding to the locked mode selection button is pressed. That is, when the mode selection button is pressed in the changer, the memory of the mode selection is retained, and the push button 14 of the VTR will be pressed later at the timing when the plunger 892 operates. Incidentally, when the push button 14 of the VTR is pressed as described above, it is locked in that state. Therefore, the mechanism for pressing the VTR button is configured to temporarily apply force to the VTR push button, as described below, and when the VTR push button becomes unlocked, it immediately returns to its original state. I'm getting ready to go back. A microswitch 806 detects the state of the mode selection button of the VTR, that is, whether it is pressed and locked or has returned to its original state. To set the eject mode, press the eject button on the changer to lock it, and then press the eject button on the changer.
3 is activated, the VTR's eject button is pressed. Also, the stop mode is transmitted by a mechanical link without going through a plunger, so that when the changer's stop button is pressed, the VTR's stop button is pressed immediately. Pressing of the changer's stop button or eject button is detected by switches 804 and 805, respectively.

The mechanism of the mode selection button is constructed as shown in FIGS. 5A to 5C. The slide lever 503 is moved by the leg 502 of the mode selection button 501.
is moved, and the end of the link 505 is fixed by the tip of the slide lever 503. This link 505 is connected to the link 504 and the link 506, and the link 506 is connected to the gear block 5.
It is connected to 07. This gear block 507
is freely rotatable about the shaft 510 and has a spring 511
is biased in the direction of the arrow. The gear block 507 includes a driving gear 509 to which driving force from the motor is transmitted, and a driven gear 508 that meshes with the driving gear 509.
It is equipped with. This driven gear 508 is
Rack 51 provided on the leg 514 of the operating arm 513 for pushing the push button 14 of the VTR
2 is designed to mesh with each other. This operating arm 513 is freely movable in the vertical direction (in the direction of the arrow) and is biased in the direction of the arrow by a spring 515 with a weak force. When the operating arm 513 is activated and the push button 14 of the VTR is pressed, the operating arm 513 is lowered, and therefore the detection switch 806 is turned on.

When the mode selection button 501 is pressed, FIG.
A slide lever 503 as shown in FIG. 1 moves, and its tip fixes one end of a link 505. When plunger 892 operates to pull link 505 in this state, gear block 507 tilts as shown in FIG. 5B, and gear 508 and rack 5
12, and the operating arm 513 is pulled downward (indicated by the arrow) with a strong force by the transmitted rotational force of the motor. plunger 89
2 is common to the five mode selection buttons 501, and an operating lever 503, a link mechanism, and a gear block 507 are provided for each mode selection button. The plunger 892 is configured to pull five links 505 in common. Therefore, if the mode selection button 501 of the changer is not pressed, the slide lever 503 does not protrude, and therefore one end of the link 505 is not fixed, so even if the plunger 892 operates, as shown in FIG. 5C. As such, the link 506 does not move, and therefore the gear block 507 does not tilt. In this way, one mode selection button pressed by one plunger 892 corresponds to one mode selection button pressed by one plunger 892.
You can operate button 14 on the VTR.

A mechanism for operating the VTR push button 14 in response to the changer push button 501 without using a plunger is constructed as shown in FIGS. 6A and 6B. A push lever 521 is moved in the direction of the arrow by a leg 502 of a push button 501 of the changer, and the tip of the push lever 521 fixes the tip of a link 522. The link 522 is rotatably supported around a pin 523. This link 522 is provided with a pin 524, and a link 525 having a locking pawl 526 is attached to this pin 524. Furthermore, the pin 523 has a link 529
is attached, and the engaging portion 530 of this link 529 and the engaging portion 527 of the link 525 are adapted to engage with each other. Therefore link 52
2 is the push lever 521 as shown in FIG. 6B.
When rotated in the direction of the arrow by
The link 529 is rotated in the direction of the arrow via the engaging portion 527. Therefore link 5
The pin 533 that is engaged with the tip of the pin 29 is pushed down and moves the operating arm 513 downward (in the direction of the arrow). In this way, the operation button 14 of the VTR is pressed. Furthermore, when the changer operation button 501 is pressed, the link 525
The lock pawl 526 hits the lock release plate 531, and the link 525 rotates around the pin 524. Therefore, the engagement between the engagement portion 527 of the link 525 and the engagement portion 530 of the link 529 is released,
The link 529 rotates in the direction of the arrow by the force of the spring 532. At this time, the push button 50 of the change gear
1 and the push button 14 of the VTR are each locked, but the coupling mechanism is released, so the push button 14 of the VTR can be automatically reset, and the push button of the changer can be reset independently. It is also possible to do so.

When using the connection mechanism shown in Figures 6A and 6B
When the VTR button 14 is automatically reset, the changer push button 501 is also unlocked by a mechanism as shown in FIGS. 7A and 7B. First, when the push button 501 of the changer is pressed, the tip of the lock plate 542 fits into the fitting part 541 provided on the leg part 502. This lock plate 542 is freely rotatable about a pin 543 and is urged in the direction of the arrow by a spring 544. This locked state is the 7th A.
This is shown by the solid line in the figure. VTR button 14
When the lever returns, the operating arm 513 rises (in the direction of the arrow), so that the pin 555 provided on its leg 514 causes the end 553 of the lever 550 to rotate in the direction of the arrow. This lever 550 is pin 5
It is free to rotate around 51. This lever 5
50 is located at the solid line position in FIG. 7A by a protrusion 554 provided on the leg 514 of the operating arm 513 that descends when the button 14 of the VTR is pressed. The other end 552 of lever 550 is adapted to slide on a cam 548 provided on link 545. Since this cam 548 has a protrusion 549 at the center, when the lever 550 rotates in the direction of the arrow, the link 545 is attached to the pin 54.
6 is rotated once to the position indicated by the chain double-dashed line, and then returned to the position indicated by the solid line, making a reciprocating motion. Therefore, the release claw 5 of the link 545
47 pushes the tip of the lock plate 542 and the leg 5
02 is disengaged from the fitting portion 541. When the VTR button 14 is automatically restored in this way, the changer push button 501 is also unlocked and restored. The restored state is shown in FIG. 7B.

[Insertion/ejection section]

The insertion/ejection section 6 feeds the cassette that has fallen from the cassette magazine 4 into the cassette holder 11 of the VTR, or pulls it out and carries the cassette to the ejection port. The insertion/ejection part 6 is shown in FIGS. 8A and 8B.
As shown in the figure, it has two belts 611 and 621. As shown in Figure 8B, this belt is a metal belt with an arc-shaped cross section, and although an elastic force acts to maintain linearity in the longitudinal direction, it has considerable flexibility. . The belt 611 is arranged along the side wall 211 of the case of the changer, and has pads 612 and 613 attached to both ends.
The cassettes are sandwiched between the front and back. A pad 622 is attached to the tip of the belt 621, and the pad 622 is arranged so as to move left and right toward the discharge port 603. This belt 62
1 is stored in the belt storage box 623 in a spiral manner. belt 61
1,621 are each driven by a drive roller 61
4,624 by pressing pinch rollers 615,625. The pinch rollers 615, 625 are pressed against the drive rollers 614, 624 by plunges 894, 895, respectively.
It is carried out by.

When a cassette falls from the cassette magazine 4, it will be located at position 601 in FIG. 8A. At this time, belt 611 is in the forward position as shown by the solid line in FIG. 8A, so that pad 612
is recessed, and pad 613 is prominent.
Note that the pad 613 passes through the inside of the cassette holder 11 through the tape outlet 13 of the cassette holder 11, and is located near the insertion opening 12 of the cassette holder 11. At this time, switch 808 operated by pad 612 detects that belt 611 is in the forward position. When the plunger 894 operates and the pinch roller 615 is pressed against the drive roller 614, the pad 612 protrudes and the pad 613 retracts. In this way, the cassette at position 601 is moved to position 602 by pad 6.
It is pushed and carried by 12. A position 602 indicates the position of the cassette in the cassette holder 11. At this time, the belt 611 is at its most retracted position as a whole, and the recessed pads 613
The switch 809 operates accordingly. At this time, since the protruding pad 612 has reached the insertion opening 12 of the cassette holder 11, the cassette holder 11 cannot be pushed down as it is, so the belt 611 as a whole returns slightly and the pad 612 retreats slightly. Then, the pad 613 protrudes a little from the retracted position, so the switch 80
9 stops operating. In this way, the magazine section 4
The cassette 19 from above is pushed into the holder 11.

When ejecting the cassette 19 from the holder 11, the belt 611 as a whole is in the retracted position,
The pad 613 is in the recessed position, and the pad 612 is in the protruding position. At this time, the plunger 894
When the belt 611 operates and the drive roller is rotated in the opposite direction, the belt 611 as a whole returns to the forward position. At this time, the pad 613 pushes the cassette and pushes the cassette that was at position 602 to position 601. Then, the pushed out cassette first operates the switch 807, then the pad 612 reaches the re-insertion position, and the switch 808 operates. At this time, the plunger 895 operates, pushes the pinch roller 625 against the drive roller 624, pulls out the belt 621 housed in the storage box 623, and pulls out the belt 621 housed in the storage box 623.
is sent out to the left in FIG. 8A. Padded 6
When 22 is in the re-immersion position, the switch 810 is operating, but because it is extended in this way,
It becomes OFF. The cassette located at the position 601 is pushed by the pad 622 to the discharge port 603.
be moved to. At this time, first switch 807
is turned OFF, and then when the pad 622 reaches the re-extruded position, the switch 811 is turned ON.
In this manner, the cassette is transported to the discharge port 603.

Note that a window 212 is provided at a predetermined location on the side wall 211 of the case of the changer (see FIG. 8B). Then, when the belt 611 is in the retracted position, that is, when the pad 613 is not intruding into the holder from the tape outlet 13 of the cassette holder 11, the part visible from the window 212 is colored as shown in FIG. 8B. A mark 616 made of tape, paint, etc. is formed on the belt 611 and placed. Thus, when this mark 616 is visible through the window 212, it indicates that the belt 611 is in the retracted position and that the changer 2 can be attached to or detached from the VTR 1.

[Holder pushing down part]

The holder push-down portion 7 is for pushing down the cassette holder 11 after the cassette is pushed in. As shown in FIGS. 9A and 9B, a pad 702 is attached to the tip of the push-down lever 701. Lever 701 is connected to shaft 717 and is rotated by a force applied to shaft 717 via limiter and clutch mechanism 711. The fact that the holder 11 has been pushed down is detected by a switch 813 operated by the protrusion 703 of the lever 701. Limiter/clutch mechanism 711 is constructed as shown in FIG. 9C. When the gear 716 rotates, the driving part 714 also rotates,
Since the driving portion 714 and the driven portion 712 are brought into close contact with each other by the spring 718, rotation is transmitted to the driven portion 712 via the engagement slope 715. Driven part 7
12 and the shaft 717 are connected, so the lever 7
01 rotates. Holder 11 by lever 701
When the limiter/clutch mechanism 711 is pushed down, the torque transmitted by the limiter/clutch mechanism 711 becomes excessive. Therefore, a slip occurs on the slope 715 of the driven part 712 and the driving part 714, and the driven part 712 moves against the force of the spring 718, and is disengaged from the driving part 714. In this way, excessive torque is not applied to the lever 701.

A driving force from a motor is applied to a gear 716 of the limiter/clutch mechanism 711 via a gear 721 and a gear 727. Gear 721 is rotatably attached to lever 722 via pin 723 and always meshes with gear 727. The lever 722 is rotatably attached to a shaft 724 of a gear 727, and is biased in the direction of the arrow by a spring 728. A link 726 is connected to the other end of the lever 722 via a pin 725, and a plunger 896 for starting the push-down operation is connected to the other end of the lever 722.
When actuated, link 726 is pulled, causing lever 722 to rotate in a direction opposite to the force exerted by spring 728. Then, due to the force of the spring 728, the gear 71
At this time, gear 721, which had not been engaged with gear 6, becomes engaged with gear 716. Furthermore, since the gear 727 rotates in the clockwise direction as shown in FIG. 9A, a force is applied to the gear 721 in the direction of biting into the gap between the gear 716 and the gear 727.
Therefore, even after the operation of plunger 896 has stopped, the rotation of gear 727 is transmitted to gear 716 via gear 721. At this time, the limiter/clutch mechanism 711 operates as described above, and the gear 71
6 becomes unloaded, the force that urges the gear 721 in the biting direction disappears, so the force of the spring 728 that is pulling the lever 722 causes the gear 721 to return to its position. Therefore, the meshing between gear 721 and gear 716 is released.

Next, the mutually related operations of the above-mentioned parts will be explained. This operation is controlled by a control circuit 8 shown in FIG. Note that the circuit shown in FIG. 10 is just one example, and as will be described later, it goes without saying that various other circuits can be configured to control similar operations.

The motion consists of six basic motion steps. That is, a dropping stroke in which one cassette 19 is dropped from the magazine section 4, an insertion stroke in which the dropped cassette is inserted into the holder 11, a pushing down stroke of the holder 11,
These are a process of operating the button 14 of the VTR, an eject process of pressing the eject button of the VTR to raise the holder 11, and an eject process of pulling out the cassette 19 from the raised holder 11 and transporting it to the ejection port 603. Typical cases for each of these steps will be explained step by step with reference to FIG.

[Typical case]

First, change gear 2 is properly fixed to VTR 1, switch 801 is OFF, and switch 8
14 is ON, change gear power switch 85
7 is turned on and the power supply circuit 856 is working. At this time, the power of the VTR 1 is also turned on. There is a cassette 19 in the magazine 4, and an insertion/ejection part 6
belt 611 is in the forward position, and belt 621 is in the forward position.
is assumed to be in the immersed position. At this time, for example, assume that the playback mode selection button 501 is pressed.

At this time, since the cassette 19 is in the magazine, the normally closed contact of the switch 802 is open, and since the belt 611 is in the forward position, the normally closed contact of the switch 808 is opened by the pad 612.
Also, the pad 622 of the belt 621 in the retracted position
Therefore, the normally closed contact of switch 810 is open.
Since the cassette in the magazine has not yet fallen, the normally closed contact of switch 807 for detecting a fall is closed. Since the mode selection button was pressed at this time, the normally closed contact of the switch 803 is opened, so that all the input conditions for the NAND circuit 821 are satisfied. Note that the output of the switch 807 is input to a NAND circuit 821 via an inverter 823. Therefore, an output is generated from the NAND circuit 821, operating the monomulti 822 and operating the plunger 891 for the cassette dropping device. In this way, the falling stroke is performed.

When the cassette 19 falls, the contacts of the switch 807 are opened. Therefore, the flip-flop 824 is set by the output of the inverter 823,
This output is mono multi 825, inverter 826
The signal is sent to the NAND circuit 827 via the NAND circuit 827. NAND
Circuit 827 produces an output because the three input conditions are met, setting flip-flop 828 and operating plunger 894. At this time, the output of the flip-flop 828 simultaneously becomes a normal rotation input of the control circuit 845 of the motor 9. Therefore, the belt 611, which was in the forward position, is driven toward the backward position. Then, as the pad 612 protrudes, the contact of the switch 808 is closed, which causes an output to be generated at the inverter 829 and reset the flip-flop 824. Furthermore, pad 612
protrudes, the pad 613 retracts, and the switch 809 operates at the most retracted position of the pad 613.
The normally closed contact becomes open. Therefore, the flip-flop 828 is reset, and the operation of the plunger 894 and the forward rotation of the motor 9 are stopped. Since the contact of the switch 809 is opened, the monomulti 830 is further activated to operate the plunger 894 again and provide a reverse rotation input to the motor control circuit 845. Therefore, the belt 611 returns for the time specified by the monomulti 830, and therefore the pad 612 returns slightly. After the cassette 19 is completely fed into the holder by the pad 612, the pad 612 returns slightly and the insertion process is completed.

The output of the monomulti 830 is further passed through a differentiating circuit 8.
31, it passes through the monomulti 832 to operate the plunger 896 for starting the holder pushing down operation, and passes through the monomulti 833 to give a normal rotation input to the motor control circuit 845. When the holder is pushed down in this manner, the normally open contact of the switch 813 is closed, and an input is given to the NAND circuit 847 via the monomulti 846. In this way, the pushing down stroke of the holder is completed.

At this time, the contact point of switch 812 is open (because the holder is pressed down), and switch 80
Since the contact No. 3 is open, the input conditions of the NAND circuit 847 are satisfied and an output is generated, operating the monomulti 848, operating the plunger 892, and providing normal rotation input to the motor control circuit 845.
In this way, the process of operating the mode selection button of the VTR is completed.

The VTR is thus locked by pressing the mode selection button, and the operation of the playback mode, for example, proceeds. When the tape end is reached, the tape automatically enters a stop state, the mode selection button is unlocked, and the tape returns automatically. Then, the contacts of the switch 806, which had been closed, are opened, and the differential circuit 8
The output is sent to a NAND circuit 851 via 50. At this time, the changer's stop button is not pressed, so the switch 804 is open, and therefore the output of the mono multi 853 continues to be generated, so the conditions are met, an output is generated in the NAND circuit 851, and the mono multi 852 After that, plunger 893
While operating the motor control circuit 845, a normal rotation input is given to the motor control circuit 845. In this way, the eject button of the VTR is operated, and after the VTR performs a tape unloading operation, the holder is raised. The eject process is performed in this manner.

When the holder rises, switch 812 closes, differentiating circuit 842 operates, flip-flop 843 is set, plunger 894 is operated, and a reverse rotation input is provided to motor control circuit 845. Therefore, the belt 611 is driven,
The backward position leads to the forward position. Therefore, the pad 613 pushes the cassette out of the holder. Then, switch 807 is first opened, and then switch 808 is opened. Therefore, flip-flop 824 is reset immediately after being set. At this time, the flip-flop 843 is also reset, stopping the operation of the plunger 894 and stopping the reverse rotation input to the motor. At this time, the switch 808 is open, and the input condition of the NAND circuit 837 is set by the output of the monomulti 825 operated by the set output of the flip-flop 824, so that the flip-flop 838 is set. In this way, the plunger 895 operates,
A normal rotation input is given to the motor control circuit 845.
Therefore, the belt 621 is fed out,
The cassette is carried by pad 622 to outlet 603. Then, as the pad 622 protrudes, the switch 810 is closed, and then the cassette pushed by the pad 622 to the discharge port 603 opens the switch 811.
Therefore, an output is generated from the differentiating circuit 839, which resets the flip-flop 838 and resets the plunger 89.
5 and stop the normal rotation input. The output of the differentiating circuit 839 is further sent to a flip-flop 840 to set it, and the plunger 89
5 is operated again, and this time a reverse rotation input is given to the motor control circuit 845. Therefore, the belt 621 once let out will be pulled back again. When the pad 622 returns to the re-immersed position, the switch 810 changes from closed to open, so the flip-flop 840 is reset via the inverter 841, and the plunger 89 is reset.
5. The operation is stopped and the reverse rotation input is stopped.
The belt 621 stops at the retracted position. In this manner, the process of ejecting the cassette from the holder is completed.

The position of each belt in the insertion/ejection section 6 returns to the state mentioned above, so if the mode selection button on the changer is still locked at this time, all the conditions mentioned at the beginning have been met and the belt will fall again. A series of steps starting from step 1 will be performed in sequence. In this way, the cassettes are replaced one after another with new cassettes, and the mode selected by the changer can be operated continuously while automatically replacing the cassettes.

[If the changer stop button is pressed while the VTR is operating in a specified mode]

At this time, the stop button 14 of the VTR is immediately pressed by the mechanical sequence mechanism. Therefore
The mode selection button on the VTR is unlocked and returns automatically. In this way, the VTR stops, but does not move on to the eject process as it does at the end of the tape. That is, since the stop button of the changer is pressed, the normally open contact of the switch 804 is closed, and an output is generated from the monomulti 853. Therefore, the output from the normally open contact of switch 806, which was opened in response to the return of the mode selection button of the VTR, reaches the differentiating circuit 850, and the differentiating circuit 850
Even if the output occurs from 50, the NAND circuit 851
produces no output. This is because the eject process described above is not performed. Therefore, in this case, the VTR stands by in a stopped state. At this time, the changer's mode selection button is also unlocked, so if the changer's mode selection button is pressed again, the VTR's mode selection button is immediately operated, and the VTR operates in that mode.

[If you press the changer eject button when the VTR is in the stopped state]

As mentioned above, when the changer's eject button is pressed while the VTR is in the stopped state, the normally open contact of the switch 805 changes to the differential circuit 854.
The signal is then sent to the monomulti 852. Therefore, the eject process described above is performed.

[When there is a cassette in the holder and the holder is pushed down (other things are the same as in the typical case)]

At this time, when the mode selection button on the changer is pressed as in the typical case, the cassette drop stroke will not be performed because the conditions are not met, and therefore the cassette insertion stroke and holder push down stroke will also not be performed. This is the belt 611 of the insertion/ejection part.
This is because the position of is different from the typical case. Also, since the normally open contact of switch 812 is open, the signal from switch 803 is sent to NAND circuit 847.
After that, the monomulti 848 is reached, so that an operation process is performed and the mode selection button of the VTR is pressed. Thus, the VTR immediately starts operating in that mode.

[If the holder cannot be pushed down even though the holder pushing down process has started]

At this time, when the holder is pushed down, the monomulti 8
The output from 33 is sent to a differentiating circuit 834, which output serves as a set input to a flip-flop 835. At this time, since the holder is not pressed down, the switch 813 remains open, and the flip-flop 83 is transferred from the monomulti 846 to the flip-flop 83.
The reset signal that is supposed to be given to 5 does not occur. Therefore, the flip-flop 835 is set, and the output of the flip-flop 835 causes the plunger 89 to
4 operates, and a reverse rotation input is applied to the motor control circuit 845. Therefore, from this point on, the process moves to the ejection process.

[If the VTR mode selection button cannot be pressed even though the VTR mode selection button operation process has started]

When the accidental erasure prevention claw of the cassette is broken.
This happens when you try to press the record button on a VCR. In this case, even though the button operation process described above has been performed, the mode selection button on the VTR is not pressed down, and therefore the switch 80 is not pressed down.
6 normally open contacts remain open. Therefore, the reset signal for the flip-flop 849 is not given, so the flip-flop 849 is set at the trailing edge of the output of the monomulti 848.
An eject process is performed. Then, the ejection stroke continues, and a new cassette stroke begins, in which the next cassette stored in the magazine is loaded into the VTR.

[If the changer and VTR power are turned off while the VTR is operating in the specified mode]

At this time, the VTR's mode selection button is automatically unlocked. The changer's mode selection button remains locked. After this, when the power is restored, the normally open contact of switch 803 is closed, so no output is generated from circuit 855. This circuit 85
5 is a circuit that produces an output when the power is turned on while the switch 803 is open. Also, at this time, since the cassette holder is in a depressed state, the normally open contact of switch 812 is open, so
An output is generated in the NAND circuit 847, and the monomulti 84
Reach 8. A button operation process is therefore performed. Therefore, when the power is restored after being turned off, the VTR's selection button for the mode locked in the changer is immediately operated, and the VTR starts operating in that mode.

[If the cassette holder is pressed down and the mode selection button on the VTR is not pressed when the power is turned on]

This case occurs, for example, immediately after the changer 2 is attached to the VTR 1. At this time, switch 8
12 normally open contacts are open and switch 806
The contacts are also open. Therefore, there is no reset input to flip-flop 849. Moreover, at this time, the mode selection button of the changer is not pressed, so the contact of the switch 803 is open, so an output is generated from the circuit 855 at the same time as the power is turned on.
Therefore, the flip-flop 849 is set by this output, and after the eject stroke is completed, the eject stroke is subsequently performed. Therefore, if the cassette happens to be housed in the cassette holder when the changer is attached to the VTR, and the holder is in a depressed state, the cassette will be automatically ejected at the same time as the power is turned on.

[If the cassette holder is raised when the power is turned on]

This case may also occur when it is first installed in the changer VTR. In this case, if the changer mode selection button has not been pressed yet, the contact of switch 803 is open. Therefore circuit 855
An output is produced and becomes the set input of flip-flop 849. At this time, since the holder is rising, the normally open contact of switch 812 is closed. For this purpose, a reset input to flip-flop 849 is provided. Therefore, flip-flop 849 is not set and therefore no eject operation is performed. Since the normally open contact of switch 812 is closed, an output is produced from differential circuit 842, and flip-flop 843 is set. Therefore, a reverse rotation input is applied to the motor control circuit 845, and the plunger 894 operates.
Therefore, the cassette ejecting process is performed. In other words, even if the cassette happens to be housed in the holder that is in the raised position at the time of installation, the power
It is automatically discharged as soon as it is turned on.

[When removing the chain gear from the VTR]

In this case, the lever 311 of the attachment part 31 is operated first. Then, the contact of the switch 801 is closed, an output is generated from the differentiating circuit 836, the flip-flop 828 is set, the plunger 894 is operated, and a normal rotation input is given to the motor control circuit 845. Therefore, the belt 611 moves in the same way as in the cassette insertion process, so that the belt 61
1 finally stops at a position where its pads 612 and 613 do not cover the cassette holder 11. Therefore, even if the pad 613 enters the tape outlet 13 of the cassette holder 11 and reaches the forward position near the insertion opening 12 when removing the tape, it will automatically prevent the tape from being removed. The vehicle will be driven to the retracted position without any movement. Note that when the belt 611 is in the retracted position, the belt 611
11 is displayed through the window 212, indicating that the changer can be safely removed from the VTR.

[Brief explanation of the drawing]

Figure 1 is a front view of the VTR and chainer, Figure 2 is a partially cutaway side view of the VTR and chainer, Figure 3 is a partial front view of the magazine section, and Figure 4 is a partially cutaway side view of the VTR and chainer.
The figures are schematic diagrams showing the mutual relationship between the VTR and changer operation buttons, Figures 5A to 5C, and 6A.
, 6B, 7A, and 7B are schematic side views for explaining the mechanism of the operating section, FIG. 8A is a schematic cross-sectional view showing the insertion/ejection section, and FIG. 8B is the B of FIG. 8A. - Cross-sectional view along line B, Figure 9A, Figure 9B,
Fig. 9C shows the cassette holder push-down part, Fig. 9A is a side view, Fig. 9B is a sectional view taken along line B-B in Fig. 9A, Fig. 9C is a partially enlarged perspective view, and Fig. 10 is a control. FIG. 3 is a block diagram showing a circuit section. 1...VTR, 2...Chain gear, 3...Mounting section, 4...Magazine section, 5...Operation section, 6...
...Cassette insertion/ejection section, 7...Cassette holder push-down section, 8...Control circuit, 9...Motor.

Claims (1)

[Scope of Claims] 1. A VTR with a magazine section for storing tape cassettes and a manually operated input means.
an operation unit having a mechanism for operating a push button;
It includes an insertion/ejection section for inserting and ejecting a cassette into and out of the cassette holder of the VTR, a push-down section for pushing down the cassette holder, and means for detecting that the automatic cassette exchange device is removed from the VTR; An automatic cassette changing device for a VTR, comprising: a control section that controls the insertion/ejection section to be driven to a retracted position based on the output of the detection means. 2 A magazine section for storing tape cassettes and a VTR in conjunction with manually operated input means.
an operation unit having a mechanism for operating a push button;
The device includes an insertion/ejection section for inserting and ejecting a cassette into a cassette holder of a VTR, and a push-down section for pushing down the cassette holder, and a display means for indicating that the insertion/ejection section is in a retracted position. An automatic cassette exchange device for VTRs.