JP2567785Y2 - Device to prevent erroneous erasure of tape cassette - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing erroneous erasure of a tape cassette, and more particularly to an erroneous erasure of a tape cassette which can be switched between an erasable state and a non-erasable state with a simple configuration. It relates to a prevention device. 2. Description of the Related Art In general, a concave portion for preventing erroneous erasure is formed on the rear surface of a tape cassette (for example, a video cassette), and an erroneous erasure preventing claw for closing the concave portion is provided integrally with the cassette housing. ing. When it is desired to prevent erasure of recorded information, the erroneous erasure is prevented by breaking the erroneous erasure prevention claw and opening the concave portion. However, in the device for preventing erroneous erasure of the tape cassette having the above configuration, after the erroneous erasure preventing claw is once broken, the erroneous erasure preventing claw cannot be attached to the tape cassette again. When another information is to be recorded again, the erroneous erasure preventing claw is closed by attaching an adhesive tape or the like to the cutout recess, for example, so that recording is performed again. is the current situation. For this reason, it is very troublesome to newly record information on the tape cassette after the erroneous erasure prevention claw is broken. Therefore, conventionally, an erroneous erasure prevention member (erroneous erasure prevention control plate) that slides in the longitudinal direction of the tape cassette is provided on the back of the tape cassette as proposed in Japanese Utility Model Application Laid-Open No. 56-64581. There has been an apparatus for preventing erroneous erasure of a tape cassette in which the concave portion is opened and closed by sliding displacement, whereby the erasable state and the erasable state can be switched. However, the erroneous erasure prevention device using the erroneous erasure prevention member that slides in the longitudinal direction of the tape cassette is easier to use than the configuration in which the erroneous erasure prevention claw is broken, Since the erasure prevention member slides largely in the longitudinal direction of the tape cassette, there is a problem that a large space is required to provide the erroneous erasure prevention device in the tape cassette. As is well known, the tape cassette is miniaturized as much as possible. Therefore, in order to mount an erroneous erasure prevention device which requires a large mounting space, the internal structure of the tape cassette must be large. Or the size of the tape cassette must be increased. Accordingly, an object of the present invention is to provide a tape cassette erroneous erasure prevention device which solves the above-mentioned problems by configuring the erroneous erasure prevention member to be slidable in the thickness direction of the tape cassette. Means for Solving the Problems In order to solve the above-mentioned problems, according to the present invention, an error is provided on the rear surface of a cassette housing composed of an upper half and a lower half so as to extend in the vertical direction across both halves. An erasure prevention recess, and an erroneous erasure prevention member disposed in the recess so as to be slidable in the up-down direction, wherein the erroneous erasure prevention member has an erasable position and an erasable position within the recess. In the tape cassette erroneous erasure prevention device configured to be movable between the flanges, the erroneous erasure prevention member is protruded from the flange portion toward the rear surface of the cassette housing from the flange portion. A projecting portion, an arm portion provided on both sides of the flange portion different from the projecting portion and elastically deformable in a direction perpendicular to the sliding direction, and a direction perpendicular to the sliding direction outside the arm portion And the engaging projections A storage portion in which the flange portion of the erroneous erasure prevention member is stored slidably in the up-down direction, and a protrusion portion of the erroneous erasure prevention member movable in the up-down direction. An opening configured and
When the erroneous erasure preventing member is at the erasable position and at the non-erasable position, the elastic member has a pair of engaging recesses with which the engaging protrusions are engaged by the elastic force of the arm portion. Embodiment FIG. 2 shows a tape cassette provided with a first embodiment of a device for preventing erroneous erasure of a tape cassette according to the present invention (hereinafter simply referred to as an erroneous erasure prevention device). The tape cassette 1 shown in FIG. 1 is mounted on, for example, a video tape recorder (hereinafter, referred to as a VTR) to perform recording and reproduction. As is well known, a tape cassette 1 having an upper half 2 and a lower half 3 A lock mechanism for restricting unnecessary rotation of the magnetic tape wound around the reel and the reel (both not shown)
And various other mechanisms, devices, and the like. Generally, a VTR is provided with an erroneous erasure prevention detector, which detects whether the erroneous erasure prevention recess provided on the tape cassette is closed or open, and closes the recess. If it is, it is determined that it is in an erasable state, and the information already recorded on the tape cassette is erased and a new information can be recorded,
When the concave portion is opened, it is determined that the erasure is impossible, and the information recorded on the tape cassette is prevented from being erased. This prevents the erroneous erasure of the recorded information. The concave portion for the erroneous erasure prevention detection device of the VTR to judge each of the above states is a lower left position of the back surface 4a of the cassette housing 4 surrounded by a broken line indicated by an arrow A in FIG. Is provided. The erroneous erasure prevention device 5 includes a concave portion 6 formed substantially in the height direction of the cassette housing 4 and an erroneous erasure prevention member 7 slidably displaced up and down in the concave portion 6. This erroneous erasure prevention device 5 is shown enlarged in FIG. 1 and will be described in detail below. The recess 6 is formed integrally with the halves 2 and 3 at the time of molding, and is composed of a half recess 8 formed in the upper half 2 and a half recess 9 formed in the lower half 3.
When the two and three are joined, the half recesses 8 and 9 coincide with each other to form the recess 6. That is, the concave portion 6 is formed on the back surface 4a of the cassette housing 4 over the upper and lower halves 2 and 3 so as to be long in the height direction. Each of the semi-recessed portions 8 and 9 has storage portions 8a and 9a in which the erroneous erasure prevention member 7 is slidably stored, and an opening 8 opened in the back surface 4a.
b, 9b, and engagement recesses 8c, 9c with which engagement projections 7e formed on the erroneous erasure prevention member 7, which will be described later, are formed at both lower end portions of the storage portions 8a, 9a. ing. The erroneous erasure prevention member 7 is integrally formed, and the storage portions 8a, 9
a protrusion 7b projecting from the flange 7a in the direction of the rear surface 4a of the cassette housing 2 so as to be substantially flush with the rear surface 4a in the openings 8b and 9b. It is composed of
Slits 7c are formed in the left and right flanges 7a. Therefore, both sides of the flange 7a, which are different from the positions where the protrusions 7b are formed, are directed in the direction of arrow B in the figure (that is, the sliding direction of the erroneous erasure prevention member 7). Arm portion 7d that can be elastically deformed in a direction perpendicular to the arm portion 7d). Also, the lower end of the arm 7d is outwardly directed (ie, a direction perpendicular to the sliding direction outside the arm 7d).
A locking projection 7e protruding toward is formed. Further, the protruding portion 7b is selected so as to have an area approximately equal to or slightly smaller than the opening portions 8b, 9b of the respective semi-recessed portions 8, 9. Therefore, when the erroneous erasure prevention member 7 is in the half recess 8 of the upper half and in the half recess 9 of the lower half, the protrusion 7 b
The openings 8b and 9b are closed. The erroneous erase prevention member 7 is only kept attached in advance either half during coupling of the upper and lower halves 2 and 3, the other can be attached to the tape cassette 1 never change the conventional assembly process, erroneous erasure In providing the prevention device 5, the assembly process is not particularly complicated. The erroneous erasure prevention device 5 having the above configuration is characterized in that the erroneous erasure prevention member 7 is vertically displaced in the height direction of the cassette housing. That is, the erroneous erasure prevention member 7 is provided in the half recess 8 of the upper half 2.
Is slid and displaced between the position of the lower half 3 and the position of the half recess 9 of the lower half 3. It is at the position indicated by the arrow A in FIG. 2 that the erroneous erasure detection device of the VTR determines whether the tape cassette 1 is in the erasable state or the erasable state as described above. This is the position where the opening 9b of the semi-recess 9 of the lower half 3 is formed. Therefore, when the opening 9b is closed, the erroneous erasure detection device detects the tape cassette 1
Is determined to be in an erasable state, and when it is opened, it is determined to be in an erasable state. In other words, when the erroneous erasure prevention member 7 is in the semi-recess 9 of the lower half 3, it is determined that erasing is possible. When it is in the semi-recess 8 of the upper half 2, the opening 9 b is opened so that erasure is possible. It is determined that the state is impossible. As described above, the erroneous erasure prevention member 7 is
By vertically displacing along, it is possible to easily switch between the erasable state and the non-erasable state,
An operation for canceling the erroneous erasure prevention when recording new information again on the tape cassette 1 once the erroneous erasure prevention has been reliably performed can be performed with good operability. Further, since the range in which the erroneous erasure preventing member 7 can be displaced is within the range of formation of the concave portion 6 formed in the height direction of the cassette housing 4, the displacement distance is short, so that it is necessary to provide the erroneous erasure preventing device 5. Since the mounting space in the cassette housing 4 is small, and the erroneous erasure preventing device 5 is provided at a position where a concave portion for preventing erroneous erasing has been formed conventionally, the internal structure of the tape cassette 1 is reduced. The erroneous erasure prevention device 5 can be provided in the cassette housing 4 without greatly changing or increasing the size of the cassette housing 4. The locking projection 7e formed on the flexible arm portion 7d of the erroneous erasure prevention member 7 is provided with the semi-recessed portion 9 formed on the lower half 3 when the erroneous erasure prevention member 7 is at the position where the erasure is possible. When it is engaged with the engaging recess 9c and is in a position where it cannot be erased, it engages with the engaging recess 8c of the half recess 8 formed in the upper half 2. Therefore, when the erroneous erasure prevention member 7 is at the position where each of the above states is set, the displacement is caused by the engagement projection 7e and the engagement recess.
Since it is regulated by the engagement of 8c and 9c, it is not easily displaced, so that erroneous erasure can be reliably prevented. Further, the engagement projection 7e and the engagement recess 8
To release the engagement between c and 9c, the projecting portion of the
What is necessary is just to strongly urge 7b upward or downward, and there is no need for a jig or the like to perform the release. In addition, the collar
Since the arm portions 7d provided on both sides of the 7a urge the elastic force in a direction orthogonal to the sliding direction, for example, even if there is an assembly error and a manufacturing error, this causes the arm portion 7d to elastically deform. The erroneous erasure preventing member 7
When the slider is slid in the concave portion 6, no rattling occurs, and the sliding operation can be performed smoothly. 8d, 9
d is a groove for facilitating operation when the erroneous erasure prevention member 7 is displaced. FIG. 3 shows a second embodiment of the erroneous erasure prevention device according to the present invention. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the erroneous erasure prevention device 10 shown in FIG. ₁ , the arm portions 11d- ₁ and 11d- _{2 of} the erroneous erasure prevention member 11 constituting the device are formed so as to extend in different directions in the vertical direction. That is, the left arm
11d- ₁ extends downward and has a locking projection 11e at its tip.
- ₁ is formed, the arm portion of the right 11D- ₂ is rolled out locking projection 11E- ₂ at its distal end facing upward is formed. The engagement recesses 8c- ₁ and 9c- ₁ formed in the half recesses 8 and 9 of the halves 2 and 3 are formed at the lower left end of the half recess 8 of the upper half 2, and The half concave portion 9 of the half 3 is formed at the upper right end portion. When the erroneous erasure prevention member 11 is in a position where the erasure can be performed, the locking projection 11e- ₂ provided on the right arm portion 11d- ₂ of the erroneous erasure prevention member 11 is in a semi-recessed portion of the lower half 3. When it is engaged with the engaging recess 9c- ₁ formed in the position 9 and is in a position where the erasure cannot be performed, the locking provided on the left arm portion 11d- ₁ of the erroneous erasure prevention member 11 is performed. Projection 11e- ₁ is upper half 2
Is formed so as to engage with the engaging concave portion 8c- ₁ formed in the half concave portion 8 of FIG. In the erroneous erasure prevention device 5 shown in FIG. 1, it is difficult to form the engagement recess 9c by one molding when forming the half recess 9 in the lower half 3, and the formation of the engagement recess 9c is performed. Process is separately added. However, by forming the erroneous erasure prevention device 10 as shown in FIG.
The engaging recesses 8c- ₁ and 9c- ₁ formed in the _first and second halves 2 and 3 are formed at the ends of the storage portions 8a and 9a on the opposite sides of the halves 2 and 3 so that they can be easily formed by a single molding using a mold or the like. And the manufacturing process can be simplified. Further, the third embodiment of the erroneous erasure prevention device according to the present invention is described in the fourth embodiment.
Shown in the figure. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The erroneous erasure prevention device 12 shown in FIG.
An identification protrusion 12 (the identification protrusion formed on the lower surface is not shown) is formed on the upper surface and the lower surface, and the tip surface is colored differently from the color of the cassette housing 4. Further, identification holes 13a and 13b are formed at predetermined positions of the semi-recessed portions 8 and 9 facing the identification protrusion 12 in the displacement direction of the erroneous erasure prevention member 7. When the erroneous erasure prevention member 7 is in a position where the erasure is possible, the identification projection formed on the lower surface of the erroneous erasure prevention member 7 fits into the identification hole 13a formed in the lower half 3, and the erasure is stopped. When the position is set to an impossible state, the identification protrusion 12 formed on the upper surface of the erroneous erasure prevention member 7 is configured to fit into the identification hole 13b formed on the upper half 2. Therefore, a person who intends to perform recording on the tape cassette visually recognizes whether or not the identification projection 12 is fitted into the identification holes 13a and 13b by visually checking whether the tape cassette can be erased or not. Can be determined. In addition, since the upper surface of the identification protrusion 12 is colored with a color (for example, red or the like) different from the color of the cassette housing 4 (generally black), the above determination can be made easily. According to the present invention, as described above, in order to release the engagement between the engagement protrusion and the engagement recess, the protrusion of the erroneous erasure prevention member may be strongly urged upward or downward. This unlocking operation can be easily performed because there is no need for Further, since the arms provided on both sides of the flange urge the elastic force in a direction orthogonal to the sliding direction, even if there is an assembly error and a manufacturing error, the erroneous erasure prevention member is placed in the recess. There is no occurrence of rattling when sliding with, and the sliding operation can be performed smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a first embodiment of a tape cassette erroneous erasure prevention device according to the present invention, and FIG. 2 is a tape cassette erroneous erasure prevention device shown in FIG. FIG. 3 is a perspective view showing a tape cassette provided, FIG. 3 is an exploded perspective view showing a second embodiment of the device for preventing erroneous erasure of a tape cassette according to the present invention,
FIG. 4 is an exploded perspective view showing a third embodiment of the tape cassette erroneous erasure prevention device according to the present invention. 1 Tape cassette 2 Upper half 3 Lower half 4 Cassette housing 4a Rear part 5, 10, 12
Erroneous erasure prevention device, 6 ... recess, 7 ... erroneous erasure prevention member,
7a, 11a ... flange, 7b, 11b ... projection, 7d, 11d- ₁ , 11d-
₂ ... arm part, 7e, 11e, 11e- ₁ , 11e- ₂ ... locking projection, 8, 9 ... semi-recessed part, 8a, 9a ... storage part, 8b, 9b ... opening part, 8c, 9c , 8c- ₁ , 9c- ₁ ... engaging recess, 12 ... identification protrusion, 13a, 13b ... identification hole.

Claims (1)

(57) [Rules for requesting registration of utility model] A concave portion for preventing erroneous erasure provided to extend in the vertical direction across the two halves on a rear surface portion of a cassette housing composed of an upper half and a lower half; A tape cassette erroneous erasure prevention device, wherein the erroneous erasure prevention member is configured to be movable between an erasable position and an erasable position within the recess. An erroneous erasure prevention member, a flange portion sliding in the concave portion,
A protrusion protruding from the flange in the direction of the rear surface of the cassette housing, and an arm provided on both sides of the flange different from the protrusion and elastically deformable in a direction perpendicular to a sliding direction. An engaging projection projecting in a direction perpendicular to a sliding direction outside the arm portion is integrally formed, and a flange portion of the erroneous erasure prevention member slides vertically in the concave portion. A storage portion capable of being stored, an opening configured to allow the protrusion of the erroneous erasure prevention member to move up and down, and a position where the erroneous erasure prevention member is at the erasable position and a non-erasable position. And a pair of engagement recesses in which the engagement protrusions are engaged by the elastic force of the arm portion when the device is in the position.