JPH0253864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cassette loading device.

Conventional structure and its problems A conventional cassette mounting device will be explained with reference to FIGS. 1 to 4. FIG. 1 is a perspective view, and FIGS. 2 to 4 are explanatory diagrams of the operation of the lock mechanism.

In FIGS. 1 to 4, reference numeral 1 denotes a cassette holder, which is a mounting member for storing a cassette (not shown) loaded with magnetic tape, etc., and for moving 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 cassette holding levers, which are rotatably supported by the cassette holder 1 and configured to press and fix the cassette with springs or the like (not shown). 5 is a sub-arm, and 6 is a holder support, one end of which is rotatably supported by the cassette holder 1, and the other end rotatably supported by a stand 7.
The stand 7 is fixed to a base 8 of an aluminum chassis or the like with screws or the like. Reference numeral 9 designates a lock pin which is hung on a cassette holder spring 10 which has one end fixed to the holder support 6 and the other end attached to the stand 7. The other end of the cassette holder spring 10 is hung on a stand 7. A lock roller 11 is rotatably supported on the outer periphery of the lock pin 9.
13 is a lock lever pin implanted in the lock lever 12. Reference numeral 14 designates a lock release pin installed in the lock lever 12. Reference numeral 15 designates an unlocking spring which has one end hung on the unlocking pin 14 and the other end hung on the stand 7.
The lock lever 12 is configured to rotate around a lock stand pin 16 installed in the stand 7 as a fulcrum.

A release action lever 17 is rotatably supported by an action pin 18 fixed to the stand 7. 19 is an up detection switch which is switched by the rotation of an up detection lever 21 rotatably supported by a pin 20, and 22 is a down detection switch which is switched by rotation of a down detection lever 24 which is rotatably supported by a pin 23. It's a switch. The down detection lever 24 is biased counterclockwise by a spring 25 (not shown), one end of which is hung on the stand 7.

Next, the operation of this device will be explained. Figures 1 and 2
As shown in the figure, when the cassette holder 1 is at the cassette up position (a position where a cassette can be inserted into the cassette holder 1), the up detection lever 21 is rotated counterclockwise by the lock pin 9, and the switch 19 is turned ON. and the spring 25
As a result, the down detection lever 24 is rotated counterclockwise, and the switch 22 is turned on. As the cassette is inserted into the cassette holder 1 at this cassette position and the cassette holder lid 2 is pushed down, the cassette holder 1, sub-arm 5 and holder support 6 descend with the stand 7 as a fulcrum, and the holder support 6 The lock pin 9 and the lock roller 11 supported by the lock pin 9 and the lock roller 11 both descend in the direction of the arrow A as shown in FIG. Therefore, the up detection lever 21 is rotated clockwise by the elasticity of the movable contact piece of the switch 19, and the switch 19 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. For this reason, the lock lever pin 13 embedded in the lock lever 12
moves in the direction of arrow B, and the down detection lever 24
The switch 22 is turned OFF in order to press the protrusion in the direction of arrow B against the spring 25 and rotate the down detection lever 24 clockwise.

When the cassette holder 1 is further pressed and lowered, the lock roller 11 moves over the guide part 12A of the lock lever 12 to the lock fixing part 12B of the lock lever 12, and moves the cassette holder 1 to the cassette loading position (as shown in FIG. 4). cassette down position). At this time, lock lever 12
Since the lock lever pin 13 is biased by the lock release spring 15, the lock lever pin 13 moves in the direction of the arrow C.
This causes the down detection lever 24 to rotate counterclockwise, turning the switch 22 ON again. In addition,
At this time, the switch 19 is kept in the OFF state.

In addition, when raising the cassette holder 1 from the cassette down position to the cassette up position, the release action lever 17 rotatably supported by a pin 18 implanted in the base plate 8 is pressed against the lock release kick pin 14. By making contact and rotating counterclockwise, the lock lever 12 rotates clockwise, the locking force by the lock release spring 15 is released, and the locked state of the lock roller 11 fixed to the lock fixing part 12B is released. 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 lock roller 11
During the short time it takes for the cassette to rise to the cassette up position, the down detection lever 24 switches
However, when the rock roller 11 reaches the cassette up position, the down detection lever 2
4 turns the switch 22 ON again and holds it there.
When the lock roller 11 reaches the cassette up position, the up detection lever 21 rotates and the switch 19 is turned ON again. Repeat the same operation below.

In the cassette mounting device constructed in this manner, the spring force of the cassette holder spring 10 required to completely raise the cassette to the cassette up position is applied to the cassette from a state in which the cassette has been lowered slightly before the cassette up position. It was set to the necessary biasing force. In other words, the biasing force of the cassette holder spring 10 that raises the cassette from the cassette down position to the up position is sufficient if it is the force set above. However, the cassette holder spring 10 is stretched in the cassette down position compared to the up position, and due to the spring constant, the spring force of the cassette holder spring 10 in the cassette down position is extremely large. I end up. If the spring force of the cassette holder spring 10 is large at the cassette down position, the speed at which the cassette moves up from the down position to the up position increases, causing a problem that the impact upon completing the cassette up position rise becomes large.

In addition, there are two ways to use the equipment: horizontally and vertically; when used vertically, the weight of the cassette, cassette holder, etc. that was acting when used horizontally is canceled, so the cassette The problem is that the load when raising the cassette is reduced, the speed at which the cassette goes up from the cassette down position to the cassette up position becomes extremely fast, and the impact upon completion of raising becomes extremely large.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a cassette mounting device that reduces the speed at which the cassette is completely raised from the cassette down position to the cassette up position, which was the problem mentioned above.

In order to achieve the above object, the present invention includes a cassette up/down mechanism section that moves the cassette holder up and down between a cassette up position and a cassette down position;
A lock member provided in the cassette up/down mechanism section and moved in conjunction with the vertical movement of the cassette holder, and a first biasing member that biases the cassette up/down mechanism section and the lock member toward the cassette up position. and a guide part which is rotatably held by the base plate and comes into contact with the locking member when the cassette holder is in an up position and is lowered, and the locking member moves beyond the guide part, and the cassette holder is lowered into a cassette down position. a lock lever having a lock fixing portion that sometimes comes into contact with the lock member;
a second biasing member that biases the lock lever in a direction to prevent the lock member located in the lock lever guide portion from moving downward;
the cassette holder is configured to adjust the lifting time from the cassette down position to the cassette up position by adjusting the biasing force of the biasing member;
This makes it possible to reduce the speed at which the cassette rises.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. 5 to 7 are explanatory diagrams of the operation of the locking mechanism of the cassette loading device according to an embodiment of the present invention. In the figure, numerals 1 to 9, 11, and 13 to 25 are the same as those with the same numbers shown in FIGS. 1 to 4, and have the same structure. 26 is a lock lever, and 27 is a cassette holder spring as a first biasing means. The lock lever 26 is in contact with the lock roller 11 even in the cassette up position.

When the cassette holder 1 is present in this cassette loading device, the lock lever 26 is moved by the lock roller 11.
is rotated slightly clockwise. Therefore, the down detection lever 24 is also rotated clockwise, and the switch 22 is turned OFF.
It's getting old.

Insert the cassette into the cassette holder 1 at this 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 21 is rotated clockwise by the elasticity of the movable contact piece of the switch 19, and the switch 19 is turned off. As the lock pin 9 descends in the direction of arrow A, the guide portion 26A of the lock lever 26 is further pushed by the lock roller 11 and moves in the direction of arrow B. Therefore, the lock lever pin 13 implanted in the lock lever 26 moves in the direction of arrow B, presses the protrusion of the down detection lever 24 in the direction of arrow B against the spring 25, and further pushes the down detection lever 24. In order to rotate clockwise, switch 22 is
Maintain OFF state.

Furthermore, when the cassette holder 1 is pressed and lowered, the lock roller 11 moves the guide portion 2 of the lock lever 26.
6A and the lock fixing part 2 of the lock lever 26
6B, and move the cassette holder 1 to the cassette mounting position (cassette down position) as shown in Fig. 7.
to lock. At this time, since the lock lever 26 is biased by the lock release spring 15 as the second biasing means, the lock lever pin 13 moves in the direction of arrow C. This causes the down detection lever 24 to rotate counterclockwise, turning the switch 22 ON again. In addition, at this time, switch 19 is
The OFF state is maintained.

In addition, when raising the cassette holder 1 from the cassette down position to the cassette up position, the release action lever 17 rotatably supported by a pin 18 implanted in the base plate 8 is pressed against the lock release kick pin 14. By making contact and rotating counterclockwise, the lock lever 26 rotates clockwise, the locking force by the lock release spring 15 is released, and the locked state of the lock roller 11 fixed to the lock fixing part 26B is released. The rock roller 11 moves in the direction of the arrow H, and the cassette holder 1 rises to the cassette up position. At this time, the lock roller 11 is urged by the lock release spring 15 via the guide surface of the lock lever 26 in a direction against the urging force of the cassette holder spring 27, so that its speed is reduced. During the short time it takes for the rock roller 11 to rise to the cassette up position, the down detection lever 24 is activated by the switch 22.
However, when the rock roller 11 reaches the cassette up position, the down detection lever 24 turns the switch 22 on again and holds it. When the rock roller 11 reaches the cassette up position, the up detection lever 21 rotates and the switch 19 is turned ON again. Repeat the same operation below.

In the conventional cassette loading device, the cassette holder spring 1 required to fully raise the cassette is
The spring force of 0 will be explained based on FIG.

W: Weight of the cassette holder θ ₁ : Angle of the action pin 18 and lock pin 9 with respect to the center line O θ ₂ : Angle between the urging direction of the cassette holder spring 10 and the perpendicular line P with respect to the center line O FB: Spring force of the cassette holder spring 10 na: Number of fulcrums supported on cassette holder 1 nb: Number of fulcrums supported on stand 7 μ: Friction coefficient at each fulcrum FA ₁ : Force required to hold W FA ₂ : Frictional resistance force at each fulcrum of the cassette holder FA ₃ : Frictional resistance at each fulcrum of the stand, W = 500gr, θ ₁ = 35°, θ ₂ = 45° na = 4 points,
Assuming nb = 5 points and μ = 0.3, FA ₁ = W/sinθ ₁ = 500/sin35° = 871gr FA ₂ = (W/na x μ) x na = (500/4 x 0.3) x 4 = 150gr FA ₃ =(W/nb×μ)×nb=(500×4×0.3)4=150gr, and FA is 871+150+150=1171gr. Therefore, the spring force FB required for the cassette holder spring 10
is FB=FA/sinθ ₂ =1171/sin45°=1656gr.

Next, the spring force of the cassette holder spring 27 required to completely raise the cassette in the cassette mounting device of the present invention will be explained with reference to FIG.

W: θ ₁ , θ ₂ , O, and P are the same as in FIG.

FC: Spring force of lock release spring 15 l ₁ : Length from lock stand pin 16 to lock release kick pin 14 θ ₃ : Angle between perpendicular direction to l ₁ and direction of action of lock release spring 16 X: Lock roller 11 and lock lever 26
Contact point with guide part 26A Q: Line connecting X to the center of lock roller 11 and lock pin 9 l ₂ : Lock stand pin 16 with respect to straight line Q
Length of the perpendicular line of the twist FE: Force acting on the lock roller 11 by the lock release spring 15 via the guide portion 26A of the lock lever 26 FF: Force acting on the lock release spring 15 to lift the cassette θ ₄ : Straight line O and straight line Angle with Q, na = 5 points, nb = 5 points, l ₁ = 2.8 mm, l ₂ = 32
mm, θ ₃ = 8°, θ ₄ = 10°, and FC = 1400gr, find the force FF acting on the lock release spring 15 to lift the cassette.

FD＝FC cos8゜＝1400×cos8゜＝1386gr FE＝FD×l ₁ /l ₂ ≒1213gr FF＝FE sin10゜＝241gr.

Next, find FA: FA=W/sinθ=500/sin35゜=871gr FA ₂ = (W/na×μ)×na = (500/5×0.3)×4=150gr FA ₃ = (W/nb× μ)×nb = (500/5×0.3)×4=150gr, and FA is 1171gr.

Therefore, the force FH required to raise the cassette by the cassette holder spring 27 is FA-FF=1171-241=930gr, and the spring force FG required for the cassette holder 27 is
becomes FG=FH/sinθ ₂ =930/sin45°=1315gr.

As mentioned above, we were able to reduce the cassette holder spring force by approximately 341g from the conventional 1656gr to 1315gr.
As a result, as shown in FIG. 10, the time required for raising the cassette from the cassette down position to the cassette up position (eject time) can be reduced from the conventional straight line 29 to the straight line 28. In other words, the time when used vertically can be increased from 0.09 seconds to 0.12 seconds, and when used horizontally, it can be increased from 0.16 seconds to 0.22 seconds, slowing down the speed at which the cassette rises from the cassette down position to the cassette up position. was completed.

Effects of the Invention According to the present invention, the lifting time of the cassette holder can be reduced by bringing the lock lever into contact with the lock member and by utilizing the urging force of not only the first urging means but also the second urging means. It can be made long and can greatly reduce the impact when the cassette is raised to the raised position, and it can be realized with a simple configuration.
The effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional cassette loading device, FIGS. 2 to 4 are explanatory diagrams of the operation of the locking mechanism of the same device, and FIGS. 5 to 7 are cassette loading devices according to an embodiment of the present invention. FIG. 8 and FIG. 9 are explanatory diagrams for calculating the cassette holder spring of the conventional and present invention, respectively, and FIG. 10 is a characteristic diagram showing the ejection time. 1...Cassette holder, 9...Lock pin, 1
1... Lock roller, 13... Lock lever pin, 14... Lock release lock pin, 15... Lock release spring, 17... Release action lever,
26... Lock lever, 26A... Guide section, 26
B...Lock fixing part, 27...Cassette holder spring.

Claims (1)

[Claims] 1 a cassette up/down mechanism for moving the cassette holder up and down between a cassette up position and a cassette down position;
a lock member that moves in conjunction with the vertical movement of the cassette holder; a first biasing member that biases the cassette vertical mechanism and the lock member in the direction of the cassette up position; a guide portion that comes into contact with the lock member when the cassette holder is in the up position and lowered; and a lock fixing member that engages with the lock member when the lock member moves beyond the guide portion and the cassette holder is lowered to the cassette down position. and a second biasing member that biases the lock lever in a direction to prevent the lock member located in the guide portion of the lock lever from moving downward; A cassette mounting device characterized in that the lifting time of said cassette holder from a cassette down position to a cassette up position is adjusted by adjusting a biasing force.