CN1076540A

CN1076540A - A kind of armed lever that detects the magnetic tape cassette erase-protection finger

Info

Publication number: CN1076540A
Application number: CN93102061A
Authority: CN
Inventors: 泽井国男; 金子成
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 1992-01-20
Filing date: 1993-01-20
Publication date: 1993-09-22
Anticipated expiration: 2013-01-20
Also published as: KR100279211B1; MY112558A; JPH0561827U; JP2564700Y2; KR930016979A; CN1032335C

Abstract

A kind of armed lever that detects the magnetic tape cassette erase-protection finger, it has the middle part of a described armed lever on the pivot that is contained on the printed circuit board (PCB), described first arm be formed on described magnetic tape cassette and contact as the position of erase-protection finger, and second arm with described armed lever of a contact part, whether this contact part detects described erase-protection finger and exists and open and close detector switch, it is characterized in that, described first arm and second arm are separated from each other, described two arms are with pivotally connected, described first arm is contained on the pivot on the printed circuit board (PCB), and described two arms all fuse with a compression spring.

Description

A kind of armed lever that detects the magnetic tape cassette erase-protection finger

The present invention relates to a kind of armed lever that detects the videocassette erase-protection finger.

Usually, in magnetic tape type video recorder (below be called video recorder), utilize the box-packed action of sending mechanism of tape, tape is packed into behind the video recorder, its testing agency just checks that the tape of being packed into can or can not be smeared magnetic.

Whether described testing agency forms by detecting armed lever 60 and switch 70 usually,, detect the said erase-protection finger of armed lever 60 detections and exist to shown in Figure 8 as Fig. 5.

Described detection armed lever has two arms, and first arm 62 and second arm 63 all stretch out from cylindrical portions may 61, and the direction difference of stretching out, they are contained on the pivot of printed circuit board (PCB) 100, utilize the force application apparatus (not shown) that described first arm 62 is contacted with magnetic tape cassette 50, an end of force application apparatus engages with the extension 62a of described arm 62.

As shown in Figure 5 and Figure 6, when the magnetic tape cassette 50 that inserts has described erase-protection finger 51, contact with the described erasing-proof piece 51 of described magnetic tape cassette by the protuberance 62b that is positioned at described first arm 62 ends, described detection armed lever 60 will rotate along the direction (along the direction shown in the arrow " a ") of the power of disappearing, the contact part 63a of described second arm 63 will contact with described switch 70, forbids smearing magnetic state so described video recorder is in.

On the other hand, when the magnetic tape cassette 50 that is inserted had been removed described 51, the protuberance 62b on described first arm 62 will put in the cavity 52 of the magnetic tape cassette of having removed described 51, as shown in Figure 7 and Figure 8.Thereby described detection armed lever 60 can rotate to the direction of the application of force, and the contact part 63a of described second arm 63 will leave described switch 70, so make described video recorder be in the state that can smear magnetic.

Yet in traditional recorder, described magnetic tape cassette 50 can accurately not be inserted into the precalculated position of described video recording equipment.If described magnetic tape cassette 50 concerning inserting mouth, is adorned to such an extent that (backward) departs from described precalculated position a bit, so described detection armed lever 60 will stressedly stretch between described tape 50 and switch 70.Therefore, the just often distortion of described detection armed lever 60, and also described switch 70 also will be owing to excessive pushing is broken down.

In view of the foregoing, the invention provides a kind of armed lever of described erase-protection finger of the perfect described magnetic tape cassette of detection, designed this armed lever can bear overload, even adorns to such an extent that depart from backward under a little described precalculated position when described magnetic tape cassette 50, still can bear overload.

For achieving the above object, the armed lever of this detection videocassette erase-protection finger comprises:

The middle part of said armed lever is contained on the pivot of printed circuit board (PCB);

First arm of said armed lever has a projection and contacts with the erase-protection finger of described videocassette;

Second arm of said armed lever has a contact part, and whether this contact part exists according to described erase-protection finger pushes or do not press detector switch,

It is characterized in that:

Described first arm and second arm are separated from each other, and described two arms interconnect with pivot, and described first arm is contained on the pivot on the printed circuit board (PCB), and described two arms fuse with a compression spring.

With regard to the described detection armed lever of detection erasing-proof piece of the present invention, its first arm and second arm all fuse with described spring.

When the position of described videocassette was offset a little position backward, described detection armed lever was transshipped, but because described first arm rotates the described spring applied force of antagonism, and make that described overload is that described spring self absorbs.

Fig. 1 is a skeleton view, represents the detection armed lever of detection magnetic tape cassette erase-protection finger of the present invention;

Fig. 2 is a side view, represents the essential part of video recorder of the present invention;

Fig. 3 is a planimetric map, represents the essential part of video recorder of the present invention;

Fig. 4 is the side view of the arrow Z direction among Fig. 2;

Fig. 5 is a planimetric map, represents the essential part of traditional video recorder;

Fig. 6 is a planimetric map, represents the essential part of traditional video recorder;

Fig. 7 is a side view; The essential part of representing traditional video recorder;

Fig. 8 is a side view, represents the essential part of traditional video recorder.

The explanation of each label:

1 detects the detection armed lever of tape erase-protection finger;

First arm of 2 described armed levers;

Second arm of 3 described armed levers;

4 springs;

50 videocassettes;

51 erase-protection fingers;

70 switches;

100 P.e.c. are pulled.

Below with reference to accompanying drawings, further describe the present invention by embodiment.

Fig. 1 represents an armed lever 1, and it is used for detecting the erasing-proof piece that is arranged in tape.

Described armed lever 1 is divided into first arm 2 and second arm 3, with a spring 4 described two arms is interconnected, thereby makes it into as a whole.

Described first arm 2 is made up of a cylindrical shape part 21, horizontal arm section 22, a work arm 23 and a support plate 24, horizontal arm section 22 is to stretch out to a certain direction from the bottom of cylindrical shape part 21, work arm 23 is vertically to stretch out from the end face portion of described horizontal arm section 22, and support plate 24 also is to stretch out from the bottom of cylindrical shape part 21, but the direction of stretching out is different with described horizontal arm section 22.In addition, the part 25 of a protrusion is arranged at the top of described work arm 23, and a surface of contact 25a is arranged on it, and when tape inserted in the described video recorder, protuberance 25 contacted with described tape 50 slidably.Also have, be provided with a hook 24a on described support plate 24, it hooks an end of described spring 4.

Described second arm 3, usually form by a cylindrical shape part 31, an arm 32 and a locking arm 33, arm 32 stretches out to a certain direction from the bottom of cylindrical shape part 31, locking arm 33 also is to stretch out from the bottom of described cylindrical shape part 31, but the direction of stretching out is opposite with described arm 32.In addition, stretched out one in the end of arm 32 and handled 34, and there is a hook 32a side, middle part of described arm 32, it hooks the other end of described spring 4.

Further as shown in Figure 1, the cylindrical shape part 31 of described second arm 3 pivotally is supported on the described support plate 24 of described first arm 2, and, the middle part contacts side surfaces of the described cylindrical shape part 21 of the end 33a of the described locking arm 33 of second arm 3 and described first arm 2, although described spring 4 applies put forth effort, limited the relative motion between first arm 2 and second arm 3.

With described cylindrical shape part 21 with pivot for being sleeved on rotationally on the fixing bolster (not shown) of setting on the printed circuit board (PCB) 100, thereby the armed lever 1 of said structure is installed in the described video recorder.

The mounting structure of this described armed lever 1, as shown in Figure 3, because a hook 2a that forms on first arm 2 and a termination of another force application apparatus (Fig. 3 is not shown) close, therefore, described force application apparatus will make described first arm 2 stressed, and the direction of power is towards described tape 50.In addition, among Fig. 3, label 5 expression one deck base plates.

When described tape was inserted into the normal position, then the effect of being brought into play as armed lever 1 as described in the erasing-proof piece as described in the above-mentioned detection that is installed in the video recorder was identical with traditional detection armed lever.That is to say, when described tape inserts described normal position, just on the described slidingsurface 25a of described work arm 23 ends, slide.After the insertion, by described slidingsurface 25a is contacted with the described erasing-proof piece 51 of described tape, described armed lever is rotated to the direction of cancellation power, thereby, described manipulation by making described second arm 3 34 contacts with described switch 70, forbids smearing magnetic state and video recorder is in.

Also have, when removing described erasing-proof piece 51, because the described protuberance 25 of described work arm 23 can put in the described cavity 52 of described tape 50, described armed lever is to being rotated by the direction of the application of force, so described switch 70 has been left in the described manipulation of described second arm 3 34, smears magnetic state thereby described video recorder is in, although not shown, the same with the mode of traditional test rod.

In addition, when the position after tape inserts is offset slightly backward, the described projection 25 of described work arm 23 just contacts with described erasing-proof piece 51, and described first arm 2 rotates along direction " a " simultaneously, and promptly the described position of expressing than Fig. 3 changes a bit.In this case, 2 of described the first arm rotates along direction " a " again, just withstands on the described cylindrical portions may 21.The end 33a of described locking arm 33 leaves the described side of described cylindrical shape part 21, and makes spring 4 be stretched owing to distance between the described hook 32a of the described hook 24a of described first arm 2 and described second arm increases.Utilize this pulling force, the described abnormal load that is delivered to first arm 2 is absorbed in the described spring 4, thereby prevented the distortion of described armed lever, and say further, also prevented excessive pushing switch 70.

As being described in detail above, by using the present invention, when described tape is inserted into predetermined normal place, described armed lever 1 will play the effect same with traditional detection armed lever, and when described tape is contained in abnormal position, because spring has increased deflection, absorbed the described overload that described first arm suffers, thereby prevented the distortion of described armed lever 1, also prevented excessive pushing, thereby can guarantee the normal function of described armed lever 1 described switch.

Claims

A kind of armed lever that detects the magnetic tape cassette erase-protection finger, it has:

The middle part of described armed lever is contained on the pivot on the printed circuit board (PCB);

The such position of first arm of described armed lever and the erase-protection finger of magnetic tape cassette contacts;

Second arm of described armed lever has a contact part, and whether this contact part detects described erase-protection finger and exist, and opens and closes detector switch;

It is characterized in that:

Described first arm and second arm are separated from each other, and described two arms are with pivotally connected, and described first arm is contained on the printed circuit board (PCB) on the axle, and described two arms all fuse with a compression spring.