JPH0536233A - Erroneous erasure preventing mechanism for recording medium housing cassette - Google Patents

Abstract

PURPOSE:To provide an erroneous erasure preventing mechanism capable of concisely displaying a propriety of recording/reproducing and capable of being operated by fingers without using a tool, etc. CONSTITUTION:A rotary body 8 is provided between an upper half 1 and a lower half 2, and a letter, etc., are inscribed on a display part 11a of display knob 13 on this rotary body 8, and also a detection part 18 inserting a detection pin of the recording/reproducing device to a detection dial 16 is formed. The rotary body 8 is fixed by a fitting member 20 in the click state for every constant rotation. When the prevention from erroneous erasure is requested, the display part 11a for the letter, etc., is made so as to display from a display window 3 for erroneous erasure prevention formed on the upper half 1 and also the detection part 18 is not made to expose from a detection hole 4 on the lower half 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous erasure prevention mechanism for an audio or video cassette or a cassette for accommodating a recording medium such as a floppy disk.

[0002]

2. Description of the Related Art Conventionally, various erroneous erasure prevention mechanisms have been proposed so as to prevent accidentally erasing the contents recorded on an audio cassette, a video cassette, a floppy disk or an optical disk. For example, an erroneous erasure prevention mechanism such as a claw folding method in which a breakable claw is formed on the rear surface of the cassette or a slide method in which a slide plate that moves left and right instead of the claw is installed is provided. Further, a piece using a piece instead of the breaking claw or the slide plate has been proposed. Especially, the nail folding method is often used for audio cassettes, and the sliding method is 8mm video tape or 3.5.
It is often used for inch floppy disks.

[0003]

However, when the nail folding method is adopted, the operation is relatively simple and the operation is reliable, but once the nail is broken, in order to record again, the erroneous erasure prevention detection hole is closed with tape or the like. It was inconvenient for repeated use. Further, when the slide system is adopted, since the slide plate is small, it is often difficult to operate with a fingertip, and it is often necessary to use a pen having a pointed tip to operate. Further, there is a difficulty in determining that it is not possible to instantly determine in which direction a recordable state should be made. Since the piece can be easily removed from the cassette, the piece may be lost. The present invention is
The present invention has been made in view of the above points, and an object thereof is to provide an erroneous erasure prevention mechanism for a recording medium storage cassette that can be easily operated and clearly discriminated by a person who is unfamiliar with handling cassettes and can be reliably and repeatedly used. I am trying.

[0004]

In order to solve the above-mentioned problems, the present invention provides a required portion of a cassette housing with a rotary body having end faces corresponding to the upper and lower surfaces of the cassette housing, and a part of the peripheral surface. Is attached so that it is exposed from the side surface of the cassette housing, and a latching member that locks each time the rotating body is rotated by a predetermined angle is arranged. A display portion of the symbol is formed, and an erroneous erasure prevention detection portion is provided on the other end face corresponding to the display portion, and the display portion on one end face and the detection on the other end face when the rotating body rotates by a predetermined angle. It is characterized in that the parts are exposed on the surface side of the corresponding cassette housing.

[0005]

According to the present invention having the above-described structure, in order to prevent the recorded contents from being accidentally erased, the externally exposed rotary member is rotated by a finger or the like, and the recordable character on one end face side is recorded. The display part such as is exposed on one surface side of the cassette housing. In this state, the rotating body is locked by the locking member,
The detection portion on the other end surface of the rotating body is also exposed on the other surface side of the cassette housing. As a result, the user can confirm at a glance that the recording is not possible, and the erroneous erasure prevention detection pin of the recording / reproducing apparatus is inserted into the detection section to prevent erroneous erasure. When the recorded data is erased and re-recorded again, the rotating body is further rotated so that the forming portion of the display unit and the detecting unit are retracted into the cassette housing, and the rotating member is locked by the locking member. .. In this state, it is possible to confirm that the recording is possible, and the erroneous erasure prevention pin of the recording / reproducing apparatus can be re-recorded without being inserted in the detection section.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an 8 mm video cassette will be described with reference to the drawings. Briefly, the erroneous erasure prevention mechanism of the present embodiment is rotatably arranged between the upper half 1 and the lower half 2 forming the cassette housing.
The upper and lower halves 1 and 2 have respective end faces facing each other, and an erroneous erasure prevention display portion (hereinafter referred to as a display portion) 11a for recording / non-recording character symbols is formed on the end face facing the upper half 1 to face the lower half 2. The erroneous erasure prevention display window (hereinafter referred to as a display window) in which the erroneous erasure prevention detection unit (hereinafter referred to as a detection unit) 18 is formed on the end surface and the display portion 11a of the rotator 8 formed on the upper half 1 are exposed. 3) and the lower half 2 is formed,
The erroneous erasure prevention detection hole (hereinafter referred to as a detection hole) 4 in which the detection unit 18 of the rotator 8 is exposed, and the latching member 20 that constrains the rotation of the rotator 8 at a fixed position are included. These configurations will be described in detail below.

The display window 3 has an upper half 1 as shown in FIG.
Is formed by two-color molding using, for example, a transparent resin at the center of the rear end of the upper surface. Further, as shown in FIG. 2, a rounded recess 6 is provided in the center of the rear surface of the upper and lower halves 1 and 2, straddling both halves 1 and 2, and a horizontally elongated slot 7 is formed on the upper half 1 side to form a lower half. A detection hole 4 is formed in the central part of the rear end of the lower surface of 2. As shown in FIGS. 5 and 6, the rotary body 8 includes a display knob 13 integrally formed with a disk-shaped large-diameter flange 11 on an upper end of a shaft cylinder 9, and as shown in FIGS. It is composed of a detection dial 16 in which a small diameter flange 15 is integrally formed at the lower end of the shaft cylinder 14, and an engagement step portion 10 is formed at the lower end of the shaft cylinder 9 of the display knob 13, and this engagement step portion 10 is detected. It is configured such that it can be integrally meshed with an engagement step portion 17 formed on the upper end of the shaft cylinder 14 of the dial 16 in the circumferential direction. Among these, the outer peripheral surface of the large-diameter flange 11 of the display knob 13 is diametrically opposed to the locking member 2 which will be described later.
The large-diameter flange 11 is formed with hooking portions 12, 12 into which 0 is fitted, and a display portion 11a having the characters "NO RECORD" is formed on a part of the upper surface peripheral edge thereof. The display knob 13 is arranged on the side of the upper half 1 so that a part of the large-diameter flange 11 is exposed to the outside through the elongated hole 7 formed in the upper half 1. A knurl is formed on the outer peripheral surface of the large-diameter flange 11 of the display knob 13. Further, the detection dial 16 is arranged on the lower half 2 side, and an erroneous erasure prevention detection pin (hereinafter referred to as a detection pin) P of the recording / reproducing apparatus is provided on a part of the lower surface of the small diameter flange 15 of the detection dial 16. The detecting portion 18 for insertion is formed in a concave shape.

Next, the latch member 20 will be described with reference to FIGS. 9 and 10. The hooking member 20 includes a shaft attachment portion 22 that is axially attached to the upper half 1 via a pin 21 that is erected on the inner surface of the upper half 1, and a support piece 24 that has an engaging protrusion 23 at the tip thereof.
And an elastic piece 25 that applies a rotational elastic force to the support piece 24 about the shaft attachment portion 22. One hook member 20 is installed at each of the above-mentioned left and right symmetrical positions of the rotary body 8 with respect to the upper half 1. That is, the latch member 20 is rotatably rotatably fitted into the pair of pins 21 and 21 which are erected while sandwiching the arrangement portion of the display knob 13 arranged on the upper half 1 at the shaft attachment portions 22 and 22, respectively. To do. Elastic piece 2 in this state
By bringing 5, 25 into contact with the inner surface of the rear wall of the upper half 1, the supporting pieces 24, 24 are biased in the peripheral direction of the large-diameter flange 11 of the display knob 13, and the respective protrusions 23 at the tip thereof.
As shown in FIG. 5, the reference numerals 23 are fitted into the hooking portions 12, 12 of the large-diameter flange 11 of the display knob 13 described above, whereby the display knob 13 is held by the upper half 1. On the other hand, a shaft pin 26 is provided upright on the inner surface of the rear center of the lower half 2, and the detection dial 1 described above is attached to the shaft pin 26.
6 is rotatably inserted and supported in the barrel 14.
As described above, the display knob 13 is attached to the half 1 and the detection dial 16 is attached to the lower half 2 in advance. The engagement step portion 17 of the dial 16 is engaged with each other to complete the rotary body 8. When the upper half 1 and the lower half 2 are united, the upper portion of the shaft pin 26 is positioned inside the upper half 1 and the display knob 1
The display knob 13 is inserted through the shaft cylinder 9 of No. 3 and also pivotally supports.

Next, the operation of this embodiment will be described based on the above configuration. After information is recorded on a recording medium housed in a cassette, for example, a magnetic tape, the large-diameter flange 11 of the display knob 13 exposed from the elongated hole 7 is rotated with a finger to prevent accidental erasure. The direction of rotation may be either left or right. Then, the display portion 11a of the characters "NO RECORD" written on a part of the peripheral edge of the large-diameter flange 11 is displayed.
Is displayed on the display window 3 of the upper half 1. With the rotation of the large-diameter flange 11, the barrels 9 and 14 rotate, and the detection portion 18 of the detection dial 16 forms the detection hole 4 formed in the lower half 2.
And is exposed on the lower surface side of the lower half 2 (see FIG. 2). In this state, the large-diameter flange 1 of the display knob 13
1, the engaging protrusions 23 of the retaining member 20 on the retaining portions 12, 12,
23 is inserted, and the rotating body 8, that is, the display knob 13 is locked by the locking member 20 together with the detection dial 16. As a result, the user can confirm at a glance that the tape cassette is in a non-recordable state, and even if the tape cassette is loaded into the recording / reproducing device for erroneous erasure, the detection pin P provided in the device is detected from the detection hole 4. The dial 16 is inserted into the concave detector 18 to prevent erroneous erasure. Further, when erasing the already recorded data and re-recording it again, the large-diameter flange 11 of the display knob 13 is further rotated by 180 degrees in either the left or right direction to display the display portion 11a and the detection dial 1.
The detecting units 18 of 6 are respectively immersed in the inside of the cassette housing. At this time, the outer peripheral surface of the large-diameter flange 11 is slidably in contact with the engaging protrusions 23, 23 of the pair of retaining members 20, 20, and the engaging protrusions 23, 23 are fitted into the retaining portions 12, 12 of the flange 11. The locking member 20 again locks the rotating body 8. In this state, it is possible to confirm at a glance that the recording is possible, and the erroneous erasure prevention pin P of the recording / reproducing apparatus is not inserted into the detection unit 18 and recording is possible again.

As described above, this embodiment uses the rotary member 8
Since it is formed by the display knob 13 and the detection dial 16, it can be easily incorporated in the assembly process of the upper half 1 and the lower half 2, and after the upper half 1 and the lower half 2 are combined, the large diameter flange 1
1 and the small-diameter flange 15 reliably rotate by the same angle due to the circumferential engagement of the shaft cylinder 9 and the shaft cylinder 14. Therefore, the recording / reproducing position can be instantly changed only by rotating the large-diameter flange 11, and the risk of erroneous operation by looking at the display window 3 can be reduced. In particular, since a part of the large-diameter flange 11 of the display knob 13 is exposed from the cassette housing, it can be easily operated with a fingertip and it is not necessary to use a tool such as a pen.
When the letters “NO RECORD” are displayed on the display window 3, the small diameter flange 15 of the detection dial 16 is displayed.
The detection part 18 formed in the above state is in a state of matching with the detection hole 4 of the lower half 2 and is very excellent in operability. Therefore, even a person who is unfamiliar with the handling of the cassette can surely prevent erroneous erasure. Further, since the detecting portion 18 is concave and the end face is closed, dust and the like are prevented from entering the cassette casing through the detecting hole 4. In addition, even if the present embodiment is repeatedly used, there is an effect that it can be operated accurately without any places where it is worn.

In the present embodiment, the depth of the concave detection portion 18 of the detection dial 16 is set to 1 mm from the bottom surface of the small diameter flange 15, and the detection is made from the detection hole 4 every time the rotating body 8 rotates 180 degrees. Although the configuration is such that the depth to the portion 18 changes, the shape of the detection hole 4 and the detection portion 18 is not limited to this,
The depth and the like can be appropriately changed without changing the gist.
Further, as for the portion where the large-diameter flange 11 of the display knob 13 is exposed from the elongated hole 7, an arbitrary position such as the left and right ends of the cassette can be selectively set. Further, the shape, size, etc. of the display window 3 can be arbitrarily set, and the characters etc. written on the rotating body 8 are not limited to those in the above embodiment. For example, display knob 13
Centering around the shaft cylinder 9 on the surface of the large-diameter flange 11 of
"OK RE"
The characters "CORD" may be written side by side. Further, instead of these characters, different colors may be applied to confirm whether or not recording is possible. Further, the rotating body 8 is not limited to the shape and structure of this embodiment, and for example, the display knob 13 and the detection dial 16 may be integrally formed from the beginning, and the entire shape may be formed into a cylindrical shape. Good.
As for the hooking member 20, a protrusion corresponding to the engaging protrusion 23 may be formed in one of the upper and lower halves 1 and 2 and replaced with this. Further, although the above-mentioned embodiment shows one example applied to the 8 mm video cassette for convenience of description, it is not limited to this, and it can be applied to an audio cassette, other standard video cassette, floppy disk, optical disk and the like. There is no end.

[0012]

As described above, according to the erroneous erasure prevention mechanism of the present invention, erroneous erasure can be easily and reliably prevented without using a special tool. In addition, since the display window is large and it is possible to instantly recognize it by characters and the like, even a person unfamiliar with handling can surely confirm the recording / reproducing position. Further, since the rotation member is in a state in which the rotation is restricted by the latching member at every constant rotation, there is no inconvenience in operability, and there is no fear of failure even if the repeated erroneous erasure prevention mechanism is used. Produce the effect of.

[Brief description of drawings]

FIG. 1 is a perspective view of an 8 mm video cassette equipped with an erasure prevention mechanism.

FIG. 2 is a bottom perspective view of an 8 mm video cassette showing an operating state.

FIG. 3 is a partially cutaway plan view of an 8 mm video cassette having an erroneous erasure prevention mechanism.

FIG. 4 is a partially cutaway rear view of an 8 mm video cassette equipped with an erasure prevention mechanism.

FIG. 5 is an enlarged plan view of an erroneous erasure prevention mechanism.

FIG. 6 is an enlarged sectional front view of a display knob.

FIG. 7 is an enlarged sectional front view of the detection dial.

FIG. 8 is an enlarged bottom view of the detection dial.

FIG. 9 is an enlarged plan view of a latch member.

FIG. 10 is an enlarged front view of a latch member.

[Explanation of symbols]

 1 Upper half 2 Lower half 3 Incorrect erasure prevention display window 4 Detection hole 7 Slender hole 8 Rotating body 9 Shaft cylinder 11 Large diameter flange 11a Display section 13 Display knob 14 Shaft cylinder 15 Small diameter flange 16 Detection dial 18 Detection section 20 Locking member

Claims (1)

Claim: What is claimed is: 1. A rotary body having end faces corresponding to the upper and lower surfaces of the cassette casing, at a required portion of the cassette casing, and a part of the peripheral surface of the cassette casing being a side face of the cassette casing. Along with being axially attached so as to be exposed, a latching member that locks each time the rotary body is rotated by a predetermined angle is arranged, and a display portion of a character symbol of recordability is formed on one end face of the rotary body, An erroneous erasure prevention detection unit is provided on the other end face in correspondence with the display unit, and the cassette holder corresponding to the display unit on one end face and the detection unit on the other end face when the rotating body rotates by a predetermined angle. A mechanism for preventing erroneous erasure of a recording medium storage cassette, characterized in that it is exposed on the front side of the body.