JPH0329801Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a magnetic recording and reproducing device having a cassette holder useful for video tape recorders (hereinafter abbreviated as VTR) and the like, which aim to be smaller and lighter.

(B) Prior Art A cassette holder is characterized by being held by two arms on each side of the holder and lifted by a spring. However, if left as is, the left and right arms would operate independently, causing the cassette holder to twist or bend. Therefore, as shown in Japanese Utility Model Application No. 58-176247, it is common practice to fix the left and right arms using connecting rods so that their movements coincide.

FIG. 4 shows a conceptual side view of a small and lightweight type cassette holder, which is currently widely used in the beta system, VHS system, VHS-C system, etc., as a conventional example.

In FIG. 4, the support portion 1 is fixed to the main body (not shown) of a VTR. One ends of the two arms 2 and 3 are pivoted on the fulcrums 2a and 3a of the support section, respectively, and the other ends are supported on the fulcrums 2b and 3b of the cassette holder 4.
Each is supported by a shaft. These two arms 2 and 3 provide stability to the cassette holder 4 in the front and back direction. Further, a connecting rod 6 is attached to the fulcrum 2a (located on the supporting part 1 side and behind the cassette 5).
This connecting rod has one end pivoted on another support part existing perpendicularly to the paper plane of FIG. 4, and the other end pivoted on the cassette holder 4, and the arm 2 shown in the drawing It acts so that the two move in the same way. The solid line shows the state in which the cassette holder 4 is housed in the main body, and the one-dot chain line shows the state in which it is exposed to the outside of the main body by the force of a spring means (not shown). In addition, the cassette holder 4
is lowered by applying a manual force from above, and is maintained in the retracted state by a locking means (not shown) that prevents the action of the spring means (not shown). This conventional example has the disadvantage that the portion where the connecting rod 6 is disposed is located at the rear of the cassette holder 4, which increases the size of the VTR mechanism. Note that the cassette becomes an obstacle at the fulcrum 2b and 3a, making it impossible to provide a connecting rod. Furthermore, by providing a connecting rod at the position of the fulcrum 3b, the space required for mechanisms such as a reel stand (not shown) and a loading device (not shown) located below the cassette holder 4 indicated by a solid line is limited. This has the disadvantage of doing so.

The above problems arise because the conditions for the length of the arm and the position of the fulcrum for vertically moving the cassette holder do not match the conditions for providing the connecting rod.

(c) Problems to be solved by the invention This invention solves the problem of increasing the size of the VTR mechanism due to the provision of a connecting rod in the cassette holder of a magnetic recording and reproducing device as shown above. be.

(d) Means for solving the problem The present invention has a connecting rod rotatably installed between both sides of the cassette holder, and at both ends of the connecting rod.
A second engaging means is provided at the other end of a pair of arms, each of which is provided with an engaging means, one end of which is pivotally supported on a support fixed to the VTR main body, and the other end of which is pivotally supported on a side surface of the cassette holder. The configured configuration.

(E) Function The present invention has the above-mentioned configuration, and as the cassette holder moves in the vertical direction, the engaging means of the arm pivotally supported on the side surface of the cassette holder rotates, and in conjunction with this, the engaging means rotates. A connecting rod having an engaging means engaged with the means is rotated. In other words, the movement of the arm corresponds to the movement of the connecting rod. As a result, the rotation angles of the left and right arms are matched via the engagement means and the connecting rod, thereby making it possible to prevent the cassette holder from twisting or bending during vertical movement.

(F) Embodiment FIGS. 1, 2, and 3 show an embodiment of the present invention in a small and lightweight 8 mm VTR. In FIG. 1, which shows the right side, a support part 7 fixed to the VTR main body (not shown) has a shaft that serves as a pivot point for two arms 9 and 10 for raising and lowering a cassette holder 8 in a substantially vertical direction. 9a, 1
0a is planted. One end of the arm 9 is rotatably supported by the shaft 9a, and one end of the arm 10 is rotatably supported by the shaft 10a. Shafts 9b and 10 are located on the right side of the cassette holder 8.
b is planted, the other end of the arm 9 is attached to the shaft 9b, and the other end of the arm 10 is attached to the shaft 1.
0b, respectively, so as to be rotatable. Moreover, the cassette 1 inserted into the cassette holder 8
A connecting rod 12 is rotatably installed between both sides of the cassette holder, and a gear 13 serving as a first meshing means is fixed to the end of the connecting rod 12. A gear 14 as a second meshing means is formed at the cassette holder side end of the arm 9 as shown in the figure, and meshes with the gear 13. Therefore, the connecting rod 12 rotates as the arm 9 rotates. The solid line shows the state in which the cassette holder is housed in the main body, and the dashed-dotted line shows one end on the support side of arm 9 and the other end on the cassette holder side of arm 10, which is exposed to the outside of the main body by the force of a spring 15 as shown. This shows the state in which the Also, the cassette holder 8
is lowered by applying a manual force from above, and the stored state is maintained by a locking means (not shown) that prevents the action of the spring 15. Note that the lock means is released by operating an eject button on the VTR body.

FIG. 2 is a top view showing the connecting rod 12 in an installed state. FIG. 3 is a left side view, which corresponds to FIG. 1 and has the same configuration as above. Note that parts that are symmetrical to those in FIG. 1 are indicated with the same numbers and dashes.

Next, the operation of the arm and connecting rod will be explained.
The cassette holder is moved up and down in a substantially vertical direction by the rotation of arms 9 and 10. The rotation of the arm 9 is controlled by a gear 1 formed at the end of the arm on the cassette holder side.
4 meshes with the gear 14 and is transmitted to the gear 13 fixed to the end of the connecting rod 12.
2 rotates according to the rotation. On the other hand, a gear 13' is similarly fixed on the left side of the connecting rod 12, as shown in FIG. It meshes with. For this reason, gear 13
The rotation angles of the gear 14 and the gears 13' and 14' are the same through the connecting rod 12, and the left and right rotation angles of the pair of arms 9 and 9' are the same.
Therefore, the cassette holder can be moved up and down without twisting or bending. Further, in this embodiment, one spring is provided on each side for raising the cassette holder, but it is clear that there will be no problem even if one of the springs is omitted due to the effect of the connecting rod.

In this embodiment, compared to the conventional example shown in FIG. 4, the arm is shorter in length and fits within the lateral direction of the side surface of the cassette holder, making it more compact despite the use of a connecting rod. Furthermore, the cassette holder can be moved up and down in a substantially vertical direction, as shown by the solid line and the dashed-dotted line in FIGS. 1 and 3. This makes it easy to attach the cassette to the reel stand or loading device inside the VTR body, and allows the cassette holder to move in and out.
The opening of the VTR body can be made smaller.

(G) Effects of the invention As mentioned above, the present invention has a simple structure, and the support position of the arm for raising and lowering the cassette holder in an almost vertical direction is not restricted by the installation position of the connecting rod, so it has a greater degree of freedom in design. This has the effect of increasing the amount of energy and making it easier to downsize.

[Brief explanation of drawings]

FIG. 1 is a right side view of essential parts of an 8 mm VTR which is an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a left side view thereof. FIG. 4 is a conceptual side view of the main part of a conventional magnetic recording/reproducing device. 7, 7'...Support part, 8...Cassette holder,
9, 9', 10, 10'... Arm, 12... Connecting rod, 13, 13', 14, 14'... Gear, 15,
15'...Spring.

Claims (1)

[Claims for Utility Model Registration] The cassette holder 8 has one end rotatably supported by a pair of shafts 9b and 9b' which are installed on the outside of both sides of the cassette holder 8, and a pair of support parts 7 on the VTR body.
A first arm 9, 9' whose other end is rotatably supported by a pair of shafts 9a, 9a' mounted on the shaft 7', and a first arm 9, 9' is connected between the cassette holder 8 and the VTR main body. , a pair of second arms 10, 10' that define the moving state of the cassette holder 8 together with the first arms 9, 9', and a connecting rod that passes through both sides of the cassette holder 8 and is rotatably supported. 12, a pair of first meshing means 13, 13' fixed on both sides of the connecting rod 12, and a pair of first meshing means 13, 13' formed at one end of the first arm 9, 9' and meshing with the first meshing means 13, 13'. A magnetic recording/reproducing device comprising second meshing means 14, 14'.