JPS59167869A - Cassette holder mechanism of video tape recorder - Google Patents

Abstract

PURPOSE:To attain miniaturization by descending a cassette holder automatically to a prescribed position by a tensile force of a spring when the cassette holder is pushed down to another prescribed position. CONSTITUTION:A lever 9 supported pivotally to a link mechanism freely turnably supporting the cassette holder 1 movably in vertical direction, a spring 12 tensed to the link mechanism, a spring 13 tensed between the lever 9 and the link mechanism, and stoppers 10, 11 engaged with the lever 9 are provided. When the holder 1 is pushed down manually to the prescribed position, the lever 9 is engaged with a stopper 10, the springs 12, 13 are elongated and the lever 9 is turned, and when the holder is descended further from the position, the lever 9 is detached from the stopper 10 and is engaged with the stopper 11, the spring 13 descends the holder 1 and the lever 9 is turned. As a result, the holder 1 is locked surely, and since small stroke is enough, the miniaturization is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a cassette holder mechanism for a video tape recorder (hereinafter abbreviated as v'rR).

In order to fix the prior art cassette inside the VTR body,
R is equipped with a locking mechanism, and the cassette holder is locked in a predetermined position within the VTR main body.

However, if the rising force exerted on the cassette holder by the spring acts on the cassette holder even during the above-mentioned locking, the end opposite to the end pushing down the cassette holder against the rising force becomes V'. Since the cassette holder is lifted up from the main body and the cassette holder is twisted, there is a problem that the cassette is not accurately fixed at a predetermined position within the VTR main body.

In order to solve this problem, a conventional method has been used in which the amount of twist of the cassette holder is estimated in advance, and the lifted cassette holder is further lowered from the locked position to a predetermined position where the cassette is accurately fixed. However, with this method, it is necessary to provide an extra space in the VTR body for lowering the cassette holder, a so-called overstroke, which increases the thickness of the VTR.
It is not suitable for downsizing R. Additionally, the force that locks the cassette holder is canceled out by the rising force of the spring, and the cassette holder is not securely locked at the designated recording or playback position, which can cause a problem in the VTR itself. are doing.

OBJECTS OF THE INVENTION It is an object of the invention to obviate the various drawbacks mentioned above and to provide a system in which, when the cassette holder is pushed down to a predetermined first position,
To provide a cassette holder mechanism that is automatically pulled down to a predetermined second position within a VTR body by the tensile force of a spring, securely locks the cassette holder, has small overstroke, and is suitable for downsizing of a VTR. be.

Details of the invention Explain.

In FIG. 7, the VT box main body 1 is a cassette holder 3, and the video cassette 14 is a cassette holder.

In FIG. 1, reference numeral 1 denotes a cassette holder in which a video cassette tape is stored, which includes a mouth-shaped bottom plate 1a;
It has an upper plate IC fixed in parallel to the bottom plate 1a at the inner upper ends of both side walls 1b of the bottom plate. 2 is cassette holder 1
This is a bracket provided on the VTR main body 3 so as to be parallel to and close to the side walls 1b of the cassette holder in order to support the cassette holder. The cassette holder 1 includes a first arm 4 and a second arm 5.
The cassette holder 1 is supported by the bracket 2 by the arm 4.50 when the arm rotates.

It moves up and down with respect to the VTR main body 3.

FIG. 2 is a side view of FIG. 1 with the bracket 2 omitted. ! It is rotatably supported by a bin 4a on the side wall 1b of the set holder, and the other end is provided with a long hole so that it can be moved left and right while being guided by a horizontal long hole 6 formed in the bracket 2. It is pivotally supported by a guide pin 4b attached to the guide pin 6. Similarly, one end of the second arm 5 is rotatably supported by a pin 5a on the bracket 2, and the other end is attached to the cassette holder side wall 1b.
It is pivotally supported by a guide pin 5b of the long hole 7 so that it can move in the left-right direction along the horizontal long hole 7 (D).

The central portions of the first arm 4 and the second arm 5 are rotatably connected to each other by a pin 8 to form an X-shaped link mechanism.

Reference numeral 9 denotes a 〈-shaped lever, and the center of the lever 9 is connected to the first arm by a guide pin 4b so that it can move in the left-right direction along the elongated hole 7 together with the first arm 4 and is rotatable.
It is pivotally supported at one end of the arm 4. A shaft 9a is formed at the upper end of the lever 9 and projects outward.
It engages with a first stopper 10 provided inside the bracket 2 to restrict rotation of the lever 90. Further, the rotation of the lever 90 is also regulated by a second stopper 11 provided inside the bracket 2 so as to be able to protrude from the bracket 2. Furthermore, the lever can be moved 90 times and is also restricted by a stopper 4C provided near the pin 4b of the first arm 4 so as to protrude outward.

In FIG. 1, reference numeral 12 denotes a first spring that applies a lifting force to the cassette holder 1, and one end of the spring 12 is stretched over a guide pin 5b so that it can move horizontally along the elongated hole 7. The other end of the spring 12 is stretched over the cassette holder side wall 1b, so that the first spring 12 is attached to the inner upper end of the cassette holder 1.
llj in FIG. 2: The second step of pulling down the cassette holder 1
It is a spring, and one end of the spring is stretched over the lower end of the lever 9, and the other end is stretched around the center of the first arm 4.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 to 6.

In FIG. 3, the guide bins 4b and 5b are fixed to the rightmost ends of the elongated holes 6 and 7 by the tensile force of the first spring 12, and the cassette holder l is moved to the uppermost position in FIG. It's still. Further, although the second spring 13 acts on the lever 9 with a counterclockwise rotating force using the guide pin 4b as a fulcrum, the lever 9 engages with the stopper 4C of the 17th arm 4 and remains stationary. ,ing.

Next, as shown in Figure 4, manually insert the cassette holder 1.
When pressed down, the first arm 4 rotates clockwise about the bin 8 as a fulcrum, and the second arm 5 rotates counterclockwise about the bin 8 as a fulcrum. As a result, guide pins 4b and 5
b respectively with one end of the arm 4.5 and the elongated hole 6,
7 to the left, the first spring 12 is expanded.

Furthermore, when the lever 9 moves to the left together with the guide pin 4b, the shaft 9a of the lever 9 engages with the first stopper 10. At this time, the second stock 11 is attached to the bracket 2.
Since it does not protrude from the inside, the lever 9 passes through the second spring 11 and rotates clockwise about the guide pin 4b as a fulcrum while moving to the left. As a result, the second spring 13
is expanded.

Further, when the cassette holder 1 is pushed down, the lever 9 moves the shaft 9a to the first stopper 1 as shown in FIG.
When the guide pin 4b moves leftward to a predetermined position, the shunt t-9a passes under the stopper 10 and separates from the first stopper 10, and the lever 9 moves to the left.
The tensile force of the second spring 13 causes it to rotate counterclockwise about the guide pin 4b as a fulcrum.

As shown in FIG. 6, when the lever 9 rotates to a predetermined position, it engages with the second stopper 11 protruding from the inside of the bracket 2. The tensile force of the second spring 13 causes the guide pin 4b to rotate counterclockwise and move the guide pin 4b to the left. At this time, the rightward force acting on the guide pin 4b from the first spring 12 via the first arm 4 is smaller than the leftward force acting from the second spring 13 on the guide pin 4b via the lever 9. Both springs 12
and 13 are selected, so guide pins 4b11,
By rotating the lever 9, it moves to the left together with one end of the first arm 4 from the position shown in FIG. 6 to the leftmost end of the elongated hole 6. As a result, the first arm 4 rotates clockwise about the bin 8, and the cassette holder 1 is automatically moved to the position shown in FIG. The cassette holder 1 is then lowered to the lock position, and the cassette holder 1 is locked to the VTR main body 3.

When ejecting a cassette, if the second stopper 11 protruding from the bracket 2 is moved inside the bracket 2, the lever 9 rotates counterclockwise to unlock the guide pin 4b and pull the first spring 12. The force causes the first arm 4 to rotate counterclockwise using the bin 8 as a fulcrum, and the 27th arm 5 to rotate clockwise, so that the cassette holder 1 is automatically moved to the uppermost position in FIG. Return.

Effects of the Invention As detailed above, according to the present invention, two springs are provided in the link mechanism, and when the cassette holder is pushed down to the first predetermined position, the force of the lowering spring is reversed. , the lowering spring pulls down the cassette holder at the second predetermined position inside the VTR main body over the force of the rising spring, so that the cassette holder is crimped and securely locked at the second predetermined position, and the overloading Since the stroke may be small, the VTIt main body can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a side view of Fig. 1 with the bracket omitted, and Fig. 3 1 is an operation of the embodiment of Fig. 1 with the cassette holder in the uppermost position. The side view, FIG. 4, shows the cassette holder pushed down from the position 7 in FIG. 3, and the side view, FIG. FIG. 6 is a side view showing the operation of the cassette holder being pulled down, and FIG. 7 is a perspective view schematically showing the VTR main body, the cassette holder, and the video cassette. 1.Cassette holder, 2.Bracket, 3.VT
R body, 4... first arm, 5 second arm, 9...
Lever, 10: first stopper, 11: second stopper, 12: first spring, 13: second spring, 14: video cassette. Patent applicant Ricoh Co., Ltd.

Claims (1)

[Claims] (1) A cassette holder that is movable relative to the video tape recorder body, a link mechanism that supports the cassette holder so that it can move up and down, a lever that is rotatably supported by this link mechanism, and a lever that is tensioned by the link mechanism. a first spring suspended between the lever and the link mechanism; and a second spring stretched between the lever and the link mechanism.
a spring; and first and second stoppers provided to engage with the lever, and when the cassette holder is manually pushed down to a predetermined position, the lever engages with the first stopper. At the same time, the lever rotates so that the two springs are expanded, and when the cassette holder further descends from the predetermined position, the lever separates from the first stopper and engages with the second stopper. The cassette holder mechanism is characterized in that the lever rotates so that the second spring pulls down the cassette holder.