JPS6327784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring mechanism for attaching and detaching a cassette in a cassette type magnetic recording/reproducing device, and includes a spring for biasing a cassette to a recording/reproducing position, and a spring for biasing the cassette to an insertion/ejection position. By configuring the take-out spring for taking out the workpiece in an extremely rational manner, it is possible to reduce the operating force even though the required force can be obtained. The present invention will be described in detail below based on an embodiment in which the present invention is applied to a specific example of a cassette attachment/detachment mechanism.

The attachment/detachment mechanism of the cassette shown in the figure has the front part configured as the insertion/extraction part A of the cassette 1, first support shafts 2, 2' provided on both the left and right sides of the rear part, and a second support shaft 2, 2' provided on either the left or right side of the front part. A first cassette support member 4 without a bottom and provided with a support shaft 3 is provided on the left and right sides of a chassis 5 that provides a drive mechanism for the cassette, and the first support shafts 2 and 2' are movably mounted. The first guide slots 6, 6' in the front-rear direction and the second support shaft 3
A guide member formed with a second guide elongated hole 7 consisting of an elongated hole part a in the front-rear direction to which the elongated hole part a is movably attached, and an elongated hole part b in the vertical direction continuous to the lower rear side of the elongated hole part a. 8, 8', and the first and second support shafts 2,
2', 3 to the first and second guide slots 6,
The first cassette support member 4 is rotatably provided below the first cassette support member 4, which is attached to the left and right guide members 8 and 8 and is movable between the left and right guide members 8 and 8'.
a second cassette support member 10 configured to raise and lower the cassette support member 4; a hook-shaped support piece 11 is provided protruding from the rear lower part of the first cassette support member 4; The edge 9 of the second cassette support member 10 can be freely supported in the raised position by the shaped portion 12. This cassette attachment/detachment mechanism is merely one example, and any other mechanism may be applied as long as the cassette 1 is moved from the insertion/ejection position to the recording/reproduction position and then installed. However, in the present invention, in such an attachment/detachment mechanism,
The movable member that moves together with the cassette 1, that is, the first cassette support member 4, is provided with an actuation shaft 13, and an actuation lever 14 is rotatably provided near the movement position of the actuation shaft 13, so that the actuation point o is located near the middle position of the movement stroke of the operating shaft 13, and a coil spring 15 is connected between the operating point o and the operating shaft 13. Further, a locking lever 16 is rotatably attached to the operating lever 14, and the locking lever 16 can lock the operating lever 14 unrotatably.
When the lever is removed, the locking of the operating lever 14 is released so that the operating lever 14 can freely rotate. Such an operation can be achieved, for example, by providing a locking shaft 17 on the operating lever 14 so that the hook-shaped locking portion 18 of the locking lever 16 can be freely locked on the locking shaft 17, and also On the operating lever 14,
Operating portions 22 and 23 of protrusions 20 and 21 provided on the take-out lever 19 of the cassette 1 are provided, and when the take-out lever 19 takes out the cassette 1, the locking lever 16 and the operating lever 14 are sequentially rotated. This is possible by configuring the lock to be released when the lock is released. Here, the moving member, that is, the first
The cassette support member 4 is biased in the direction of insertion and removal of the cassette 1 by a take-out spring 24. In the embodiment shown in the figures, the take-out spring 24 also has the function of biasing the operating lever 14 in the direction in which it is locked by the locking lever 16.

The operation of the present invention in the above configuration will be explained as follows together with the operation of the attachment/detachment mechanism. First, to install the cassette, insert cassette 1 into the outer box 2 of the device.
The cassette is inserted into the first cassette support member 4 from the insertion/extraction portion A through the insertion/extraction opening 26 formed at 5 and moved. The cassette 1 is thus supported on its underside by the edge 9 of the second cassette support member 10, which is held in the raised position by the hook-shaped portion 12 of the support piece 11, and is also exit 26
Alternatively, the first cassette support member 4 can be moved while maintaining a predetermined posture by being prevented from swinging in the left-right direction by a hook-shaped cassette support piece 27 provided on the first cassette support member 4. The member 4 is moved rearward, and the actuation shaft 13 is moved from the front to the rear. In this case, since the operating lever 14 is unrotatably locked by the locking lever 16,
A coil spring 15 connected between the operating point o of the operating lever 14 and the operating shaft 13 is bent as the operating shaft 13 moves and generates a repulsive force. Therefore, the force required to move the cassette 1 as described above is the sum of the initially applied repulsive force and the biasing force of the take-out spring 24. However, when the actuating shaft 13 moves in this way and reaches the rear of the actuating point o of the actuating lever 14, the repulsive force of the coil spring 15 due to the curvature acts as an additional force that moves the actuating shaft 13 further rearward. Turn to Therefore, the force required to further move the cassette 1 is the biasing force of the take-out spring 24 minus the biasing force of the coil spring 15. By setting the cassette 1 to a large value, the cassette 1 is forcibly moved rearward by the thus energized first cassette support frame 4.
Incidentally, reference numeral 28 is a resilient cassette holder provided to support the cassette 1 at this time.

When the cassette 1 reaches a predetermined rear position in the manner described above, the hook-shaped portion 12 of the support piece 11 provided at the rear lower part of the first cassette support member 4 comes off from the second cassette support member 10 and its end At the same time that the edge 9 becomes freely downwardly movable, the second support shaft 3 moves into the second guide elongated hole 7.
The second support shaft 3 can freely descend to the upper part of the elongated hole b in the vertical direction, but the direction in which the second support shaft 3 descends along the elongated hole b is the direction of the biasing force by the coil spring 15. As a result, the first cassette support member 4 pivots its front portion downward about the first support shafts 2, 2', thereby allowing the cassette 1 to be mounted at a predetermined recording/reproducing position. By leaving a curve in the coil spring 15 even after the cassette 1 is installed, the cassette 1 can be forcibly energized to a predetermined recording/playback position by the coil spring 15, so that it is not affected by vibrations. It can perform good recording and reproducing, and is ideal for, for example, a cassette-type magnetic recording and reproducing device for automobiles. Note that the mechanism for moving the pinch roller P and magnetic head H to start recording and playback after loading the cassette 1, and the mechanism for retracting the pinch roller P and magnetic head H from the cassette 1 when the cassette 1 is removed are free. be.

Next, in order to take out the cassette 1 installed in the recording/playback position, push the take-out lever 19 (so-called eject lever) backward, and then move the second cassette support via the link 29, push-up shaft 30, etc. as appropriate. The member 10 is rotated upward and the lower side of the cassette 1 is pushed up by the edge 9 of the second cassette support member 10. According to the present invention, when the cassette 1 is taken out from the recording/reproducing position, the locking of the operating lever 14 by the locking lever 16 is released so that the operating lever 14 can freely rotate. That is, in the illustrated embodiment, when the eject lever 19 is pushed rearward, the second cassette support member 10
Prior to the rotation of the lever 19 , the protrusions 20 and 21 provided on the take-out lever 19 sequentially actuate the actuating parts 22 and 23 to rotate and remove the hook-shaped locking part 18 of the locking lever 16 from the locking shaft 17 . , thereby making the operating lever 14 rotatable. When the operating lever 14 becomes rotatable in this way, the coil spring 15 which had been bent
The actuating lever 14 is rotated by the repulsive force to eliminate the curvature, and the repulsive force also disappears.
Therefore, in the present invention, the biasing force of the coil spring 15 that sets the cassette 1 in the recording/reproducing position does not become any repulsive force when the cassette 1 is taken out.
Only the auxiliary forces of . However, as described above, the cassette 1 rises and the first cassette support member 4
When the second support shaft 3 reaches the upper part of the elongated hole part b in the vertical direction of the second guide elongated hole 7, the first cassette support member 4 is forcibly moved by the biasing force of the take-out spring 24. The cassette 1 is moved to the front of the chassis 5, and the cassette 1 can then be taken out to the insertion/ejection opening 26. The operating shaft 13 is connected to the operating lever 1.
4, the operating lever 14 is again locked by the locking lever 16.
The state becomes suitable for mounting the next cassette 1. still,
The second cassette support member 10 can support the lower side of its edge 9 by the hook-shaped portion 12 of the support piece 11 after the first cassette support member 4 has moved slightly forward. 1 movement can be performed in a predetermined posture.

As described above, the present invention includes a spring for forcibly moving the cassette to the recording/reproducing position after the cassette is slightly moved from the insertion/ejection position, and for holding the cassette at the recording/reproducing position even after installation. Since the configuration is such that no repulsive force is generated in the ejecting direction when ejecting the cassette, only a small amount of force is required for ejecting the cassette. Since the force can be reduced, the major feature is that the initial operating force required to insert the cassette is small. In addition, since the spring of the present invention is constructed of a coiled spring, a large required force can be obtained with small dimensions, contributing to miniaturization of the device.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
Figures a, b, and c are respectively an explanatory front view, a plan view, and a side view. Figure 1 d is an explanatory cross-sectional view taken along the line - - of Figure 1 a. Figures 2 a and b are before and after the cassette is installed. FIG. 2c is an explanatory front view showing the state of the mechanism after the cassette is installed; FIG. 2d is an explanatory sectional view taken along the line -- of FIG. Figure 3 a, b, c, d, e and Figure 4 a,
b is an explanatory side view and perspective view respectively showing the operation of the present invention. Code 1...cassette, 2, 2'...first support shaft,
3... Second support shaft, 4... First cassette support member, 5... Chassis, 6, 6'... First guide slot, 7... Second guide slot, 8, 8 '...Guide member, 9...Edge, 10...Second cassette support member, 11...Support piece, 12...Hook-shaped portion, 13...
Actuation shaft, 14... Actuation lever, 15... Coil spring, 16... Locking lever, 17... Locking shaft, 18
... Hook-shaped support part, 19 ... Take-out lever, 2
0, 21... Protrusion, 22, 23... Operating part, 24
...Ejecting spring, 25... Outer box, 26... Insertion/ejection opening, 27... Cassette support piece, 28... Cassette holder, 29... Link, 30... Push-up shaft, A... Insertion/ejection part, a , b... Long hole part, o...
...actuation point.

Claims (1)

[Claims] 1. In the cassette attachment/detachment mechanism that moves the cassette from the insertion/ejection position to the recording/playback position,
An actuating shaft is provided on a moving member that moves together with the cassette, and an actuating lever is rotatably provided near a moving position of the actuating shaft so that its actuating point is located near an intermediate position of the moving stroke of the actuating shaft. A coil spring is connected between the actuation point and the actuation shaft, and a locking lever is rotatably attached to the actuation lever, so that the actuation lever can be unrotatably locked by the locking lever. A cassette-type magnetic recording device, characterized in that the locking lever is released when the cassette is taken out, and the operating lever is made rotatable, and the movable member is energized by a take-out spring in the direction of the insertion/take-out position of the cassette. A spring mechanism for attaching and detaching a cassette in a playback device.