JPH0418100Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cassette erroneous insertion prevention device that prevents cassettes from being erroneously loaded into electrical equipment such as VCRs.

<Prior art> In general, cassette mis-insertion prevention devices are standardized, and only when the cassette is correctly inserted, a groove provided in the cassette and a protrusion protruding from the storage frame engage, and the cassette is inserted. It is possible to load it into a predetermined position.

Conventional examples using this mechanism are shown in FIGS. 5 to 7. FIG. 6 shows a state in which the cassette is loaded. In this state, there are vertical clearances of L ₃ ' and L ₄ ' between the cassette 2 and the storage frame 1, respectively. This is necessary due to the structure of the locking mechanism of the cassette device, which allows product variations or is subject to cost constraints _. It was necessary to provide a clearance shown by 2 between the cassette 2 and the connecting shaft 4'.

<Problems to be solved by the invention> In the conventional device described above, the storage frame is formed with a clearance required for loading in advance, so if the cassette is inserted in the opposite direction, As shown, the cassette 2 rides on the protrusion 1a,
There was a risk that the device would be loaded incorrectly, causing damage or failure of the device.

The present invention improves the above-mentioned conventional drawbacks, secures the clearance required for the loading lock, and reduces the clearance when inserting and removing the cassette.
This is intended to prevent incorrect insertion of the cassette.

<Means for solving the problem> The present invention inserts and supports the storage frame of the cassette, connects and fixes the left and right links, and cuts out a part of the connecting shaft that rotates with the loading operation. By making it take on a substantially semicircular shape.

<Function> The connecting shaft that regulates the upper surface of the cassette in the storage frame has an approximately semicircular cross section and rotates with the loading operation, so when the cassette is inserted, the circumferential portion of the shaft rests on the upper surface of the cassette, indicating that it is in the loaded state. Since it faces the flat surface, it has the effect of varying the clearance when inserting the cassette and when loading is locked.

<Example> Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figures 1a and 1b are a side view and a rear view, respectively, showing the device for preventing incorrect insertion of a cassette according to the present invention.
1 is a cassette storage frame provided with a protrusion 1a at a predetermined position inside thereof to engage with the groove 2a. The cassette storage frame 1 has a pair of left and right short links 5, 5 and long links 6, 6, and a main body 3.
The guide pins 5a, 6a provided at the ends of both links are connected to guide holes 7', 1' provided in the side plate 7 and the cassette storage frame 1, respectively. The cassette storage frame 1 is configured to be movable up and down relative to the main body 3.

In addition, 12 is a connecting shaft between the links, 6b is a fulcrum shaft that attaches the long link 6 to the side plate 7, and 4 is a connecting shaft that connects and fixes the left and right links and is rotatably attached to the cassette storage frame 1. .

Further, 8 is a positioning pin, 9 is a cassette stay that holds the cassette 2 at the loading position, and 1
1 is a lid opening pin for opening the lid of cassette 2, 10
is the angle at which the lid opening pin 11 is attached.

The cassette erroneous insertion prevention device configured as described above operates as follows.

First, FIG. 2 shows the state in which the cassette 2 is inserted into the cassette storage frame 1. At this time, the clearance between the cassette 2 and the cassette storage frame 1 is narrow as shown by _L1. Even if an attempt is made to insert the cassette 2 in the opposite direction by mistake, the protrusion 1a contacts the rear end surface of the cassette 2, which does not have an engagement groove, as shown in FIG. 4, and reliably prevents the insertion of the cassette 2. do.

Also, from the inserted state of the cassette shown in Figure 2,
When the cassette storage frame 1 is lowered, the guide pin 5a at one end of the link 5 forming the link mechanism moves the guide hole 3 of the side plate 7 to the left in the figure, and the connecting shaft at the other end rotates clockwise in the figure. Therefore, when the loading condition shown in Fig. 3 is locked, the cassette 2
The top surface of the connecting shaft 4, which has a substantially semicircular cross section, faces the flat surface thereof. Therefore, as shown in the figure, the required clearance for L ₃ and L ₄ is obtained and the locking operation is not obstructed.

<Effects of the invention> As described above, the present invention eliminates the problem of incorrect cassette insertion by simply using a connecting shaft with a substantially semicircular cross section, without any processing or adding any parts to the device itself. This system automatically creates the necessary clearance for the locking mechanism as the loading operation occurs, and does not increase the number of manufacturing steps or costs, and also eliminates product variations by creating a wide clearance during loading. This has the practical value of increasing product reliability.

[Brief explanation of drawings]

1A and 1B are a side view and a rear view showing an embodiment of the present invention, FIG. 2 is a side view showing the same cassette inserted state, FIG. 3 is a side view showing the same cassette loaded state, and FIG. Figure 5 is a side view showing a state in which the cassette is prevented from being inserted incorrectly; Figure 5 is a side view showing a conventional example; Figure 6 is a side view showing the cassette being loaded;
The figure is a side view showing a state in which the cassette is incorrectly inserted. 1...Cassette storage frame, 1a...Protrusion, 2
...Cassette, 2a...Groove, 4, 4'...Connection shaft, L1...Clearance when inserting the cassette of the present invention, _L2 ...Clearance when inserting the conventional cassette, _{L3 , L4} ...Cassette of the present invention Clearance when loading, L ₃ ', L ₄ '... Clearance when loading a conventional cassette.

Claims (1)

[Scope of utility model registration request] A protrusion that engages with a groove formed at the tip of the cassette is provided at a predetermined position inside the cassette storage frame that is attached to the main body by a link mechanism so that it can be raised and lowered, and a pair of left and right links forming the link mechanism are connected. A cassette characterized in that a connecting shaft inserted through the cassette storage frame has a substantially semicircular cross section, and is connected and fixed to the link so that its flat part faces parallel to the top surface of the stored cassettes when the cassette storage frame is in a lowered state. Misinsertion prevention device.