JPS6246Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette holder attaching/detaching mechanism suitable for a cassette type video tape recorder.

In many cassette-type video tape recorders, the tape ejecting means is inserted into the notch of the cassette, so the cassette holder must be attached and detached using a mechanism that moves up and down, and this mechanism requires a complex combination of levers. This resulted in more complex assembly man-hours and an increase in the occurrence of failures.

For this reason, as shown in Japanese Utility Model Application Publication No. 51-13715, a method has been proposed in which a cassette holder is fixed to a rack and a pinion is engaged with the rack to move the cassette holder up and down. However, this method is difficult because the rack plate itself has a pivot point and the cassette holder moves up and down while rotating, so if this method is applied to a VTR, it is necessary to make the radius of the rack plate very large. Also, the 1970s
Publication No. 151126 discloses a case where the above method is applied to a VTR, but in this case, in order to raise and lower the cassette holder while keeping it approximately horizontal, the cassette holder is not directly fixed to the rack plate, and a complicated lever mechanism is used. It is installed through.

This invention was made in view of the above points,
This invention proposes a cassette holder attachment/detachment mechanism that can raise and lower the cassette holder of a VTR while keeping it in a substantially horizontal state using a rack plate and a pinion and without using a complicated lever mechanism.

The present invention will be described below with reference to an illustrative embodiment.

The main components of this embodiment include a cassette holder 1 made of a metal plate, a cassette lid 2 for closing the holder, a pair of racks 3 and 3' for supporting the cassette holder, and the rack 3. , 3' on a base, and a pair of synthetic resin guide posts 4 , 4' that support the rack plates 3, 3' on the base, and a pair of synthetic resin guide posts 4, 4' that are fixed to both sides of the shaft 5 bearing the guide posts and mesh with the rack plates 3 , 3' . pinions 6 , 6 ' ;
It consists of a locking means and a return means respectively disposed at 6' . Note that the drawing numbers with dash symbols are omitted because they are the components on the left side and the components on the right side, which are arranged symmetrically.

First, as shown in FIG.
1 has through holes 1a, 1a' for inserting the reel shaft on the bottom, through holes 1b, 1b' for inserting the positioning pin, notches 1c for inserting the tape pull-out means, etc., and the racks 3 , 1 on both sides.
3' , and a first screw (not shown) for fixing the rack plates 3 , 3' .
This is a metal plate on which second male screws 1e and 1e' are formed. The cassette lid 2 also has through holes 2b, 2b' for inserting the second fixing screws 7, 7' in the ribs 2a, 2a' on both sides of the lower surface, and intervening claws 2c at opposing positions to the engaging claws 1d, 1d'. , 2c' are molded. The rack plates 3 , 3' have locking through holes 3a, 3a' for locking the engaging claws 1d, 1d' in a holding portion that abuts the cassette holder 1 , and first fixing screws 8, 8'. First through holes 3b, 3b' for insertion and second fixing screws 7, 7'
Second through-holes 3c, 3c' for insertion are formed in a substantially straight line with retaining protrusions 3d, 3d' in the support portions that fit into the guide posts 4, 4' and extend downward in a substantially straight line. The engaging portions 3e and 3e' are each integrally molded. As is clear from the A-A' cross-sectional view in Figure 1 (shown in Figure 2), the inner surface of the support part is cut out in a cylindrical shape, and there are knots on the inside facing the retaining protrusions 3d and 3d'. 3f and 3f' are formed. To assemble the holder part, holder 1 and rack plate 3 ,
3' with the first fixing screws 8, 8', then connect the ribs 2a, 2a' of the cassette lid 2 to the holder 1 and the rack plate 3 ,
3' , insert the intervening claws 2c and 2c' into the engaging claws 1d and 1d', and screw them in place with the second fixing screws 7 and 7'. The guide post 4 on the left side has clamping ribs 4a, 4a that guide the rack 3 to the board, a through hole 4b that supports the shaft 5, and clamping parts 4c, 4c into which the stopper 9 is inserted.
and a protruding piece 4 inscribed in the cylindrical notch 3g of the rack.
d are integrally molded, respectively, and fixing fittings 10 for fixing the board.
is fixed on a base (not shown). The pinions 6 , 6' are fixed to both sides of the shaft 5, which is supported by bearings, and engage with the meshing portions 3e , 3e' of the rack plates 3, 3', and the left pinion 6 is shown in FIG. As shown in the figure, a locking pin 12 for locking a return coil spring 11 is fitted on the outer surface, a winding member 13 is fitted into the outwardly extending cylindrical portion 6a, and a disk 14 is further fitted around the outer periphery of the locking pin 12. The right pinion 6' has an engagement pin 12' fixed on its outer surface that engages with the locking mechanism. The locking mechanism is located at the first
A first swinging rod 16 that is pivotally supported by a support shaft 15 and can freely swing in the horizontal direction, an eject lever 17 that normally urges the first swinging rod 16 in a clockwise direction, and the first swinging rod 16 a detection means 19 that comes into contact with the loading disk 18 and detects a position where the cassette can be attached or detached;
A second swinging rod 21 is pivotably supported vertically by a second support shaft 20 on the first swinging rod 16 and is provided with a long hole 21a for engaging the engagement pin 12'.
and a lock plate 23 that locks the guide roller 22 at the tip of the second swinging rod 21.

The operation of the mechanism of this embodiment will be explained below.

First, when the cassette is installed, the right pinion 6' , which rotates about half a circle as the rack plate descends, is deflected counterclockwise by the rotating engagement pin 12'. The second swinging rod 21 is in a slightly upward position and is in an unlocked state.
Guide it further upwards, then guide it downwards,
When the second swinging rod 21 is in the horizontal state, the urging force of the ejector lever 17 urges the first swinging rod 16 to rotate clockwise, and the second swinging rod 2
The guide roller 22 at the tip of the lock plate 23 is engaged with the notch of the lock plate 23, and the roller 19a on the detection means is
is removed from the notch 18a of the loading disc 18, making the loading disc 18 rotatable. On the other hand, the left pinion 6 is wound around the outer periphery of the winding member 13 while pulling the return coil spring 11 stretched between the locking pin 12 and the base.
Accumulates biasing force and becomes locked.

Next, when the cassette is to be removed, the ejector lever 17 is slid in the direction of arrow B by pressing the eject button, and after waiting for the loading disk 18 to reach the position where the cassette can be removed, the detecting means 19
The upper roller 19a is inserted into the notch and the first roller 19a is inserted into the notch.
The swinging rod 16 is temporarily deflected counterclockwise. Due to this deflection, the second swinging rod 21 disengages from the lock plate 23, allowing both pinions 6 , 6' to rotate, and is biased by the return coil spring 11 to rotate both pinions 6, 6' . 6' is reversed, and the cassette is removed.

Note that the rack plates 3 , 3' and the guide post
4 , 4' are the cylindrical notches 3g, 3g' and the knot 3.
Since a damper effect is produced by the air cylinder formed by f, 3f' and protruding pieces 4d, 4d', there is no fear of impact occurring when the cassette is attached or detached.

In addition, in the above-mentioned embodiment, the engaging part of the rack plate and the gripping part of the guide post are slightly rounded to form a somewhat circular arc shape. This is to facilitate loading and unloading of the cassette by making the opening of the cassette holder slightly upward at the insertion position.

As described above, according to the present invention, there is provided a fixing part that clamps and fixes the cassette holder, a rack part that extends in a substantially straight line continuously from the fixing part and has a very large radius, and a rack part that is formed in the rack part. A rack plate consisting of a substantially linear meshing part with a very large radius, a guide post that slidably supports the rack part, and a pinion that meshes with the meshing part and rotates. Because there is no need to provide a pivot point on the rack plate itself, the radius of the radius of the engaging part of the rack plate can be made very large.
When used in a VTR, it is possible to raise and lower the cassette holder while keeping it in a substantially horizontal state without using a complicated lever mechanism. Furthermore, by keeping the cassette holder horizontal at the cassette mounting position and by slanting the opening of the cassette holder slightly upward at the cassette insertion position, the cassette can be easily taken in and taken out, and the space required is small.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A' in Fig.
The figures each reveal a perspective view of the locking mechanism. Explanation of main figure numbers, 1 ...Cassette holder, 3 ,
3' ...Rack plate, 4 , 4' ...Guide post,
6 , 6' ...pinion, 11...returning coil spring, 13...winding member.

Claims (1)

[Scope of utility model registration request] A cassette holder attachment/detachment mechanism comprising: a rack plate comprising a fixed portion for clamping and fixing a cassette holder, a rack portion continuing from said fixed portion in an almost straight line and having a very large radius of curvature, and a meshing portion formed on said rack portion in an almost straight line and having a very large radius of curvature, a guide post for supporting said rack portion so that it can slide freely, and a pinion that meshes with said meshing portion and rotates.