JPH0252337B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cassette mounting device, and an object thereof is to reliably detect that a cassette is mounted in a predetermined position. As shown in FIG. 1, the conventional cassette loading device uses a sub-arm 5 to move the cassette holder 1 between the cassette up position (position 1C where the cassette can be inserted into the cassette holder 1, the position shown by the two-dot chain line in FIG. 1) and the cassette up position. Daum position (cassette installation position 1
A, a cassette up-and-down mechanism section that moves the cassette up and down between the position indicated by the solid line in FIG.
When cassette holder 1 is in the cassette up position
OFF, and a microphone switch 40 that is pressed by the cassette holder 1 and turned ON when the cassette is in the down position.
0 to detect that the cassette holder 1 is installed in a predetermined position. Therefore, there is no problem if the cassette holder 1 is definitely in the cassette down position, but if you press the cassette holder 1 and lower it to the cassette down position, even if you release the pressing force even though the cassette holder 1 is not in the cassette down position. , its position (midway lock position,
Hold position 1B (indicated by the dotted line in FIG. 1). When the so-called mid-lock state is reached, the micro switch 40 is turned ON because the displacement between the cassette down position 1A and the mid-lock position 1B is only 1 to 2 mm.
For example, in a cassette video tape recorder, tape loading is started in this state, which causes excessive force to be applied to the tape, resulting in damage to the tape. In addition, even if a high-precision switch is used, the position at which mid-lock occurs will vary depending on the individual device due to variations during mass production, so it is extremely unstable whether the switch will turn on or off, making it impractical. It was hot. The present invention eliminates these drawbacks, and includes a lock member position detection section for detecting whether the lock member is located at the cassette up position of the cassette holder, and a lock lever that detects whether the lock member is located at the cassette up position of the cassette holder. By detecting the mounting state of the cassette holder based on the detection output of each lock lever position detection section that detects whether the cassette is located at the normal position, it is possible to detect that the cassette is reliably mounted at the predetermined position. A cassette loading device is provided. An embodiment of the present invention will be described below with reference to FIGS. 2 to 6. FIG. 2 is a perspective view of a cassette loading device according to an embodiment of the present invention, and FIGS. 3 to 6 are explanatory views of the operation of the locking mechanism of the same device. In the figure, reference numeral 1 denotes a cassette holder, which is a mounting member that stores a cassette (not shown) loaded with magnetic tape or the like and moves the cassette to a cassette up position and a cassette down position. Reference numeral 2 designates a cassette holder lid fixed to the cassette holder 1.
Reference numerals 3 and 4 denote presser levers for holding down the cassette, which are rotatably supported by the cassette holder 1 and configured to press and fix the cassette with springs or the like (not shown). Reference numeral 5 indicates a sub-arm, and reference numeral 6 indicates a holder support, one end of which is rotatably supported by the cassette holder 1, and the other end of which is supported by a stand 7.
It is rotatably supported. The stand 7 is fixed to a substrate 8 such as an aluminum chassis with screws or the like. 9 has one end fixed to the holder support 6,
Pass the other end of the cassette holder spring 1 through the stand 7.
It is a lock pin hung at 0. The other end of the cassette holder spring 10 is hung on the stand 7.
A lock roller 11 is rotatably supported on the outer periphery of the lock pin 9. 13 is lock lever 1
The lock lever pin 13 is rotatably supported by the lock arm 30. A lock lever fixing pin 14 is embedded in the lock arm 30, and a stand 7
It is configured to rotate around a lock release pin 15 installed in the fulcrum. Reference numeral 16 designates a lock release arm rotatably supported around the lock release pin 15 as a fulcrum, and reference numeral 17 designates a lock release kick pin which is implanted in the lock release arm 16 and has a lock release spring 18 hung at its tip. The other end of the lock release spring 18 is hung on a spring hook (not shown) of the stand 7, and is always
It is pulled in the direction of the spring hook. A lock arm spring 19 has one end hung on the lock lever fixing pin 14 and the other end hooked on the spring hook portion of the stand 7. A release action lever 20 is fixed to the stand 7 and rotatably supported by an action pin 21. 22 is an up detection switch that is switched by the rotation of an up detection lever 27 rotatably supported by a pin 23, and 26 is a down detection switch that is switched by rotation of a down detection lever 25 that is rotatably supported by a pin 24. It is. The down detection lever 25 is biased counterclockwise by a spring 32 whose one end is hung on the board 8. Next, the operation of this device will be explained. As shown in FIGS. 2 and 3, when the cassette holder 1 is in the cassette up position (a position where a cassette can be inserted into the cassette holder 1), the up detection lever 27 is rotated counterclockwise by the lock pin 9. Switch 22 is turned on, and
The down detection lever 25 is rotated counterclockwise by the spring 32, and the switch 26 is turned on.
Insert the cassette into the cassette holder 1 at the cassette up position, and as you push down the cassette holder lid 2, the cassette holder 1,
The sub-arm 5 and the holder support 6 descend using the stand 7 as a fulcrum, and the lock pin 9 and the lock roller 11 supported by the holder support 6 both descend in the direction of arrow A as shown in FIG. Therefore, the up detection lever 27 is rotated clockwise by the elasticity of the movable contact piece of the switch 22, and the switch 22 is turned off. As the lock pin 9 descends in the direction of arrow A, the guide portion 12A of the lock lever 12 is pushed by the lock roller 11 and moves in the direction of arrow B. Therefore, the lock lever pin 13 installed in the lock lever 12 moves in the direction of arrow B, presses the protrusion of the down detection lever 25 in the direction of arrow B against the spring 32, and rotates the down detection lever 25 clockwise. To rotate in the direction, switch 26 is OFF.
become. Further, as the lock lever 12 moves in the direction of arrow B, the protruding piece A of the lock lever 12 presses the protruding piece B of the lock release arm 16, whereby the lock release arm 16 and the lock release pin 17 are moved to the fourth position. As shown in the figure, it rotates in the direction of arrow C using the lock release pin 15 as a supporting shaft. In this state, when the cassette holder 1 is further pressed down and lowered, the lock lever 12 is released as shown in FIG.
The protruding piece A passes over the protruding piece B of the lock release arm 16 and moves in the direction of arrow D until the protruding piece A comes into contact with the lock lever retaining pin 14, and then stops. When the cassette holder 1 is further pressed and lowered, the lock roller 11 moves to the guide portion 1 of the lock lever 12.
Lock fixing part 1 of lock lever 12 beyond 2A
2B, and move the cassette holder 1 to the cassette mounting position (cassette down position) as shown in Fig. 6.
to lock. At this time, since the lock lever 12 is biased by the spring 19, the lock lever pin 13 moves in the direction of arrow A. As a result, the down detection lever 25 rotates counterclockwise and the switch 26 is turned ON again. Note that at this time, the switch 22 is kept in an OFF state. At the cassette down position, the holder spring 10 hooked on the lock pin 9
Since the lock roller 11 is always biased in the direction of the arrow H, and the lock lever 12 is also biased in the direction of the arrow H, the protrusion A tries to rotate in the direction of the arrow, but the lock release lever 16 Because it is locked to the protrusion B of the lock lever 12
cannot rotate and maintains this locked state. When the cassette holder 1 in the cassette down position is raised to the cassette up position, the injector lever 20 rotatably supported by a pin 21 implanted in the base plate 8 is brought into contact with the unlocking pin 17. By rotating the lock release arm 16 counterclockwise, the lock release arm 16 rotates clockwise, the engagement between the protrusion A and the protrusion B is released, and the locked state of the lock roller 11 fixed to the fixed part 12B is released. As a result, the rock roller 11 moves in the direction of the arrow H, and the cassette holder 1 rises to the cassette up position. By releasing the lock in this way, the down detection lever 25 turns off the switch 26 for a short time while the rock roller 11 rises to the cassette up position, but when the rock roller 11 reaches the cassette up position, the down detection lever 25 switches off again. 26
Switch to ON and hold. Further, when the rock roller 11 reaches the cassette up position, the up detection lever 27 rotates and the switch 22 is turned on again. Repeat the same operation below. Further, in the cassette mounting device configured as described above, when the cassette is mounted, the lock roller 11 moves from the guide portion 12A of the lock lever 12 to the lock fixing portion 1.
Near the boundary where the cassette holder moves to 2B, the cassette holder spring 10 applied to the lock pin 9 applies a biasing force in the direction of the arrow H (upward force in the drawing), and the lock release spring 18 and the lock arm spring 19 push the cassette in the direction of the arrow H. The cassette holder 1 is locked even though it is not in the normal cassette down position. , a so-called mid-lock condition inevitably occurs. However, in the device of the present embodiment, the lock lever 12 is pressed by the lock roller 11 in the direction of the arrow R and moves a little during the halfway lock. Therefore, this displacement is detected by the switch 2 via the down detection lever 25.
6, the switch 26 is turned off, and the switch 26 is turned on only when the rock roller 11 reaches the cassette down position. In addition, in the apparatus of this embodiment, the above-mentioned locking mechanism is provided on both the left and right sides of the cassette holder 1.
If one of these locking mechanisms fails,
In the so-called one-side lock state, as shown in FIG. 7, the lock pin 9 rises, presses the down detection lever 25 clockwise, and rotates it to the position shown by the dotted line, so that the switch 26 is turned OFF. In addition, in this embodiment, the lock lever 12
However, as shown in FIG. 9, a protruding piece 31C is provided near the end of the guide portion 31A, and the pressure angle between the protruding piece 31C and the direction of the force applied to the rock roller 11 is suddenly increased. However, it is also possible to use a lock lever 31 having a shape that makes it difficult to lock halfway. The operation when this lock lever 31 is used is the same as the operation shown in FIGS. 2 to 6, so a detailed explanation will be omitted. Next, an application example of this embodiment will be explained using FIG. 8. FIG. 8 is an electrical circuit diagram of a device to which the cassette loading device of this embodiment is applied. The device of this application example is the device of this example provided with a micro switch 40 as shown in FIG. 1, where 22 is an up detection switch, 26 is a down detection switch,
is a micro switch, 28 is a resistor, 29 is a reverse current blocking diode, 50 is a control circuit with a built-in microcomputer that operates as shown in the table below, 51
is the mechanism drive section.

[Table] As is clear from the table, the control circuit 50 issues a command only when the switch 22 is OFF, the switch 26 is ON, and the switch 40 is ON, that is, when the cassette holder 1 is locked at the predetermined cassette down position. and activates the mechanism drive unit 51. By doing this, it is possible to detect abnormal locking (mid-lock and partial lock) of the cassette holder 1 without disposing switches 22 and 26 on both sides of the cassette holder 1, respectively. As described above, according to the present invention, since the mounting state of the cassette holder is detected based on the detection outputs of the two position detection sections, it is possible to reliably detect that the cassette is mounted in a predetermined position. Tape loading can be started reliably.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of a conventional cassette loading device, FIG. 2 is a perspective view of a cassette loading device which is an embodiment of the present invention, and FIGS. 3 to 7 are operation diagrams of the loading state detection means of the same device. 8 is an electric circuit diagram of the same device, and FIG. 9 is a plan view showing another example of the lock lever of the same device. 1... Cassette holder, 2... Cassette holder cover, 3... Presser lever, 4... Presser lever, 5
...Sub arm, 6...Holder support, 7...
Stand, 8... Board, 9... Lock pin, 10
...Cassette holder spring, 11... Lock roller, 12... Lock lever, 13... Lock lever pin, 14... Lock lever retaining pin, 15...
...Lock release pin, 16...Lock release arm,
17...Lock release lock pin, 18...Lock release spring, 19...Lock arm spring, 20...
Inject lever, 21...Pin, 22...Up detection switch, 23...Pin, 24...Pin, 25...Down detection lever, 26...Down detection switch, 27...Up detection lever, 28
...Resistor, 29...Diode, 30...Lock arm, 31...Lock lever, 32...Spring,
40...Micro switch, 50...Control circuit,
51...Mechanism drive unit.

Claims (1)

[Scope of Claims] 1. A cassette up/down mechanism for moving the cassette holder 1 up and down between a cassette up position and a cassette down position; A moving lock member 11, a guide portion 12A that is rotatably held on a base plate while being biased in a direction to prevent movement of the lock member 11, and that comes into contact with the lock member 11 when the cassette holder is lowered, and the lock member. a lock lever 12 having a fixing part 12B that comes into contact with the lock member 11 when the cassette holder 1 moves beyond the guide part 12A and the cassette holder 1 is lowered to the cassette down position; When the lock lever 1 comes into contact with the fixed part 12B,
a locking member 16 for locking the rotation of the cassette holder 1; a locking member position detecting section 22 for detecting whether the locking member 11 is located at the position when the cassette holder 1 is opened; and the locking lever 2; 12 is the cassette holder 1
a lock lever position detector 26 for detecting whether or not the cassette holder 1 is in the position when the cassette holder 1 is lowered; Wearing state detection means 5 to detect
A cassette loading device comprising: 0.