JPS58130465A - Cassette mounting device - Google Patents

Abstract

PURPOSE:To decrease the occurrence of mid-way locking and to permit sure mounting of a cassette by forming the guiding part of a locking lever near the terminal thereof in such a way that the during descending of a cassette holder increases abruptly at the point near the dead point. CONSTITUTION:When a cassette holder is depressed and is moved downward, the force to be exerted upon a locking roll 11 and the pressure angle of a locking lever 31 increase, and the projecting piece A of the lever 31 moves in the direction of an arrow (d) beyond the projecting part B of an unlocking arm 16 until a stopper pin 14 of the locking lever abuts on the piece A and is thereby detained. When the holder 1 is depressed and is moved down further, a locking roll 11 moves to the locking part 31B of the level 31 beyond the projecting piece 31C provided near the terminal of the guiding part 31A of the lever 31, thereby locking the cassette in the cassette down position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette mounting device, and an object thereof is to securely mount a cassette in a predetermined position.

First, a conventional cassette loading device will be explained with reference to FIGS. 1 to 6.

Fig. 1 is a perspective view of a conventional cassette loading device, and Figs. 2 to 6 are explanatory diagrams of the locking mechanism of the device.
is a cassette holder, into which a cassette (not shown) loaded with magnetic tape or the like is inserted and removed.

2 is a cassette holder lid fixed to the cassette holder 1. Reference numerals 3 and 4 denote presser levers for holding down the cassette, and are configured to press and fix the cassette to the cassette holder 1 in a rotatable manner using support slits, springs, etc. (not shown).

6 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 of which is rotatably supported by the stand 7.

The stand 7 is fixed to a substrate 8 such as an aluminum chassis with screws or the like. A lock pin 9 has one end fixed to the holder support 6 and the other end hung on the cassette holder spring 1o via the stand 7. The other end of the cassette holder spring 1o is hung on a stand 7.

A lock roller 11 is rotatably supported on the outer periphery of the lock bin 9.

Reference numeral 13 denotes a lock lever pin embedded in the lock lever 12, and the lock lever pin 13 is rotatably supported by the lock arm 30.

A lock lever stop pin 14 is installed in the lock arm 30, and a lock release pin 1 is installed in the stand 7.
6 as a fulcrum.

Reference numeral 16 designates a lock release arm rotatably supported around the lock release pin 16 as a fulcrum, and reference numeral 17 designates an unlock kick bin that 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 knock part (not shown) of the stand 7, and is always pulled in the direction of the spring hook part. Reference numeral 19 denotes a lock arm spring having one end hung on the lock lever fixing pin 14 and the other end hooked on the spring hook part of the stand 7.

2o is a release action lever fixed to the stand 7 and rotatably supported by the action bin 21.

Next, the operation of this device will be explained.

Insert the cassette into the cassette holder 1 at the cassette set-up position (position where the cassette can be inserted into the cassette holder 1) shown in Figs. The holder 1, sub-arm 5 and holder support 6 descend using the stand 7 as a fulcrum, and the lock pin 9 and lock roller 11 supported by the holder support 6 both descend in the direction of arrow A as shown in FIG.

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 the arrow.

As the lock lever 12 moves in the direction of the arrow,
Lock release arm 1 is released by protruding piece A of lock lever 12.
The protruding piece B of 6 is pressed, thereby releasing the lock release arm 1.
6 and the lock release kick bin 17 rotate in the direction of the arrow -. with the lock release pin 15 as a support shaft, as shown in FIG.

In this state, when the cassette holder 1 is further pressed and lowered, the protrusion A of the lock lever 12 passes the protrusion B of the lock release arm 16 and moves 20 degrees in the direction of arrow 2, as shown in FIG.
The protruding piece A moves until it comes into contact with the lever stopper pin 14, and then stops.

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 as shown in FIG. ) to Rocksle.

In the cassette down position, the lock pin 9 and the lock roller 11 are constantly biased in the direction of the arrow H by the holder spring 1o hooked on the lock pin 9, and the lock lever 12 is similarly biased in the direction of the arrow H. The locking protrusion A tries to rotate in the direction of the arrow, but since it is stopped by the protrusion B of the lock release lever 16, the lock lever cannot be rotated.
12 cannot rotate and maintains this locked state.

Also, the cassette holder 1 in this cassette down position
To raise the eject lever 20 to the cassette set-up position, the eject lever 20 rotatably supported by a bin 21 embedded in the base plate 8 is brought into contact with the unlock kick bin 17 and rotated counterclockwise. 16 clockwise to disengage the protruding pieces A and B to unlock the lock roller 11 fixed to the fixed part 12B, and move it in the direction of the arrow H. It was composed of

In the cassette loading device configured in this way, the pressure angle θ between the guide portion 12A of the lock lever 12 and the force applied to the lock roller 11 (the pressure angle θ between the tangential direction of the guide portion 12A and the direction 7 of the force applied to the lock roller 11) is determined. When the cassette is installed, the cassette holder spring 1 hung on the lock bin 9 is near the boundary where the lock roller 11 moves from the guide part 12A of the lock lever 12 to the lock fixing part 12B.
o biasing force in the direction of arrow H (upward force in the drawing), lock release spring 18 and lock arm spring 1
9, the force pushing in the direction of arrow T (downward force in the drawing) is balanced (hereinafter, the point where this even 9 is equalized is called the dead center)
, the cassette holder 1 is locked even though it is not in the normal cassette down position.

There is a drawback that a so-called mid-lock state frequently occurs.

The present invention eliminates these drawbacks, and provides a cassette mounting device which has a simple structure, prevents the occurrence of mid-term locking, and is capable of reliably mounting a cassette.

An embodiment of the present invention will be described below with reference to FIGS. 6 to 11.

FIG. 6 is a plan view of a lock lever of a cassette mounting device according to an embodiment of the present invention, and FIGS. 7 to 10 are explanatory diagrams of the operation of the locking mechanism of the device.

In the figure, 1 to 11.13 to 21.30 are the same as those with the same numbers shown in FIGS. 1 to 5, and are constructed in the same way.

A lock lever 31 is rotatably supported by the lock lever bin 13.

The lock lever 31 has a shape as shown in FIG. 6, and the pressure angle θ between the lock roller 11 and the force applied to the lock roller 11 near the initial point of contact is approximately 11°, and the pressure angle near the end point of contact is approximately 11°. It is formed so that θ is about 6oo.

Next, the cassette loading operation of this device will be explained.

Insert the cassette into the cassette holder 1, press down the cassette holder lid 2, and then press the cassette holder 1. The sub-arm 5 and the holder support 6 descend from the state shown in FIG. 7 using the stand 7 as a fulcrum, and the lock bin 9 and lock roller 11 supported by the holder support 6 both move in the direction of arrow A as shown in FIG. Descend.

As the lock bin 9 descends in the direction of arrow A, the guide portion 31A of the lock lever 31 is pushed by the lock roller 11 and moves in the direction of the arrow. In this state, the pressure angle θ between the force applied to the lock roller 11 and the lock lever 31 is about 110.

As the lock lever 31 moves in the direction of the arrow,
Lock release arm 1 is released by protruding piece A of lock lever 31.
The protruding piece B of 6 is pressed, and this releases the lock release arm 1.
6 and the lock release kick bin 17 rotate in the direction of arrow C with the lock release bin 15 as a pivot as shown in FIG.

In this state, when the cassette holder 1 is further pressed and lowered, the force gradually applied to the lock roller 11 and the lock lever 3
1 increases, but as shown in FIG. 9, the protruding piece A of the lock lever 31 crosses the protruding piece B of the unlocking arm 16 and projects into the lock lever retaining pin 14 in the direction of arrow 2. Piece A moves until it comes into contact and is locked.

When the cassette holder 1 is further pressed and lowered, the lock roller 11 moves over the protrusion 31C provided near the end of the guide portion 31A of the lock lever 31 to the lock fixing portion 31B of the lock lever 31, as shown in FIG. Lock the cassette holder 1 in the cassette down position as shown. At this time, the pressure angle θ between the force applied to the lock roller 11 and the lock lever 31 is about 600 at the protrusion 31C, so the cassette holder 1 is lowered and the lock roller 1
In order to move and lock the cassette holder 1 to the fixed part 31B of the lock lever 31, it is necessary to press with a large force. If the pressing force is weak, the cassette holder 1 will be raised by the spring 1o and returned to the cassette setup position. .

Further, in the cassette down position, the lock bin 9 and the lock roller 11 are always biased in the direction of the arrow H by the holder spring 1o hooked on the lock bin 9, and the lock lever 31 is also similarly biased in the direction of the arrow H. Since the protrusion A tries to rotate in the direction indicated by the arrow, the lock lever 31 cannot rotate and maintains this locked state because it is stopped by the protrusion B of the lock release lever 16. .

1, this cassette holder 1 in the cassette down position
To raise the ejector lever 20 to the cassette set-up position, the eject lever 20 rotatably supported by a bin 21 embedded in the base plate 8 is brought into contact with the unlock kick bin 17 and rotated counterclockwise. By rotating the release arm 16 clockwise to disengage the protruding pieces A and B, the lock roller 11 fixed to the fixed part 31B is unlocked, and by moving it in the direction of the arrow H. Let's do it.

FIG. 11 is a characteristic diagram showing the relationship between the pressing force and stroke required to lower the cassette holder 1, and FIG.
．． 23 shows the characteristics of the conventional device, and FIG. 24 and 26 show the characteristics of the device of this embodiment.

As is clear from the figure, in the device of this embodiment, the pressing force when lowering the cassette holder 1 increases rapidly near the end of the stroke (immediately before the dead center position), so it is difficult to stop the lock roller 11 near the dead center position. It becomes very difficult to do so, and it is almost impossible for the cassette holder 1 to be locked halfway at the dead center position as in the conventional case.

As described above, according to the present invention, the vicinity of the end of the guide portion of the lock lever is formed so that the pressure angle between the lock lever and the force applied to the lock member suddenly increases, so that when the cassette holder is lowered near the dead center, By rapidly increasing the load, it is possible to reduce the occurrence of locking in the middle, and it is possible to reliably install the cassette in the cassette down position.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional cassette loading device, FIGS. 2 to 5 are explanatory diagrams of the operation of the locking mechanism of the same device, and FIG. 6 is a lock lever of a cassette loading device which is an embodiment of the present invention. 7 to 10 are explanatory views of the operation of the locking mechanism of the device, and FIG. 11 is a characteristic diagram showing the relationship between the load and stroke of the device on page 13. 1...Cassette holder, 2...Cassette holder lid, 3...Press lever, 4...
...Press lever, 5...Sub arm, 6...
...Holder support, 7...Stand, 8.
... Board, 9 ... Lock bin, 10 ...
...Cassette holder spring, 11...Lock roller, 12.31...Lock lever 113.
...Lock lever pin, 14...Lock lever stopper pin, 16...Lock release bottle, 1
6...Lock release arm, 17...Lock release kick pin, 18...Lock release spring, 19...Lock arm spring, 20...
・Eject lever, 21... Bin, 30...
...Lock arm. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure a2 Figure ti Figure 3 Figure 5 Figure 4 Figure 5 Figure 6 IA Figure 7 ff Figure 8 Figure 9 Figure 10

Claims (1)

[Scope of Claims] 0) A cassette up-and-down mechanism that moves the cassette holder up and down between a cassette set-up position and a cassette-down position, and a cassette up-and-down mechanism that is provided in the force center up and down mechanism and moves in conjunction with the up and down movement of the cassette holder. A locking member is biased in a direction to prevent movement of the locking member, and when the cassette holder is lowered, a guide portion that comes into contact with the locking member and the locking member move beyond the guide portion, and the cassette holder is moved. When descending to the cassette down position,
a lock lever having a fixed part that abuts the locking member;
and a locking member that locks the rotation of the lock lever when the lock member abuts the fixed portion of the lock lever, and the guide portion near the end of the guide portion of the lock lever. A cassette mounting device characterized in that a pressure angle with respect to the force applied to the locking member is sharply increased compared to a pressure angle at the beginning end of the guide portion. (2) The cassette mounting device according to claim 1, wherein a convex portion for preventing movement of the lock member is provided near the end of the guide portion of the lock lever.