JPH0684524U - Tape cassette detector - Google Patents

Abstract

(57) [Abstract] [Purpose] Accidental erasure prevention claw detection switch for detecting the presence or absence of the erroneous erasure prevention claw formed on the tape cassette and tape cassette position detection for detecting that the tape cassette is located at a predetermined recording / reproducing position. The present invention relates to a tape cassette detecting device including a switch, which simplifies the work of mounting and laying out lead wires so that the reaction force of each switch acts in a direction in which the tape cassette is not separated from the substrate. [Arrangement] An erroneous erasure prevention claw detection piece 2 and a tape cassette position detection piece 3 are provided on the same housing 1, and the detection pieces 2 and 3 are brought into contact with the back side of the tape cassette 11 so that the tape cassette 11 is erased by mistake By detecting the presence / absence of the prevention claw 11a and whether or not the tape cassette 11 is located at the recording / reproducing position, one housing has two discriminating functions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tape cassette detecting device of a magnetic recording / reproducing apparatus using a magnetic tape as a recording medium, and a mistaken erasure prevention nail is provided by two switches provided on the back side of the tape cassette. It is characterized by detecting the presence / absence and whether or not the tape cassette is located at a predetermined recording / reproducing position.

[0002]

[Prior art]

 Conventionally, many magnetic recording / reproducing apparatuses have a switch for preventing erroneous erasure and a position detecting switch for the cassette. Among them, the most frequently used method will be described below with reference to FIG. FIG. 5 shows a state in which the tape cassette 11 is lowered from above to a recording / reproducing position where the reels in the cassette are engaged with the reel stand (not shown) of the apparatus. 6 is an external perspective view of a tape cassette used in the magnetic recording / reproducing apparatus. Reference numeral 11 denotes a tape cassette housing, which has an erroneous erasure prevention claw 11a on its back side in order to prevent accidental erasure of recording on a magnetic recording tape (not shown) contained therein.

Reference numeral 1 denotes a switch housing fixed to a base body 9, and an erroneous erasure prevention claw detection piece 2 which rotates about a rotation center 2 a is always urged in the direction of arrow B by an elastic contact piece 5. Normally (for example, when the tape cassette is not attached), the second convex portion 2c is stationary at a position where it abuts on the housing 1. When the tape cassette 11 having the erroneous erasure prevention claw 11a is lowered to the recording / reproducing position, the erroneous erasure prevention claw 11a and the erroneous erasure prevention claw detection piece 2 come into contact with each other as shown in FIG. The prevention claw detection piece 2 is rotated in the direction of arrow C, the first convex portion 2b bends the elastic contact piece 5, and abuts on the fixed contact piece 4 planted in the switch housing 1 to cause an electric circuit. Is configured to close. Reference numeral 12 denotes a tape cassette position detection switch fixed to the base body 9, and when the tape cassette 11 comes in contact with the pin-shaped body 10 and descends to a recording / reproducing position where the position is regulated, the detection piece 12a has an arrow F. It is configured to push in the direction and close the electric circuit.

The operation of the tape cassette detection device configured as described above will be described below. First, when the erroneous erasure prevention claw 11a on the back side of the tape cassette 11 that has descended in the direction of the arrow A pushes the erroneous erasure prevention claw detection piece 2 in the C direction, the fixed contact piece 4 is The elastic contact piece 5 abuts and the electric circuit is closed, and the magnetic recording tape (not shown) in the tape cassette 11 is ready for recording. If the erroneous erasure prevention claw 11a is not provided, the erroneous erasure prevention claw detection piece 2 does not rotate and stands still, so that the fixed contact piece 4 and the elastic contact piece 5 are kept separated from each other. Since the circuit is also open, recording on the magnetic recording tape becomes impossible.

Further, the tape cassette position detection switch 12 mounted at a position different from the erroneous erasure prevention claw detection piece 2 on the base body 9 is used when the tape cassette 11 is lowered to the recording / reproducing position as described above. Then, it is confirmed that the detection piece 12a is pushed in the F direction to close the electric circuit and the tape cassette 11 is loaded at a predetermined recording / reproducing position.

[0006]

[Problems to be solved by the device]

 However, in the above-mentioned conventional configuration, the switches must be mounted in two places, and two leads from each switch to the printed wiring board 8 forming a predetermined electric circuit, a total of four lead wires 8a are required. The installation work and lead wire work were complicated. Furthermore, the reaction force of the detection piece 12a of the tape cassette position detection switch 12 pushes up the tape cassette in the direction of arrow G, so that the tape cassette 11 separates from the pin-shaped body 10 and the tape cassette 11 cannot reach the predetermined position. There was a problem that sometimes.

In order to solve the above-mentioned conventional problems, the present invention provides a structure that simplifies the mounting work of the switch and the wiring work of the lead wire, and eliminates the reaction force of the switch that acts in the direction of pushing up the tape cassette. The purpose is to

[0008]

[Means for Solving the Problems]

 In order to achieve this object, the tape cassette detecting device of the present invention has a first and a second switch, which are driven by contacting the back side of a tape cassette, mounted on the same housing. , The position corresponding to the erroneous erasure prevention claw provided on the back side of the tape cassette located at the recording / reproducing position and the position corresponding to the vicinity of the lower end of the back side, respectively. The presence / absence of the erasure prevention claw is configured to detect whether or not the tape cassette is located at the recording / reproducing position by the second switch.

[0009]

[Action]

 This structure simplifies the work of attaching switches to two places and pulling out the lead wires of each switch as in the conventional case, and pushes up the tape cassette by the reaction force of the detection piece of the tape cassette position detection switch. You can prevent this.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a switch used in the tape cassette detecting device of the present invention, and FIG. 2 is a side sectional view of the tape cassette detecting device before the tape cassette reaches a predetermined recording / reproducing position. 3 and 4 are side sectional views of the tape cassette detection device in the state where the tape cassette having the erroneous erasure prevention piece has reached the predetermined recording / reproducing position, and FIG. 4 shows the tape cassette without the erroneous erasure prevention claw. FIG. 6 is a side sectional view of the tape cassette detection device in a state where the recording / reproducing position of FIG. The same components as those of the conventional tape cassette detecting device shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1 to FIG. 4, a tape cassette position detection piece 3 that rotates around a rotation center 3 a is elastically contacted in the direction of arrow D below the conventional erroneous erasure prevention claw detection piece 2 of the switch housing 1. The second convex portion 3c is urged by the piece 6 and is stationary at a position where the second convex portion 3c abuts on the housing 1. When the tape cassette position detecting piece 3 abuts on the back side surface of the tape cassette 11, the second convex portion 3c moves in the arrow E direction. The first convex portion 3b is rotated to press the elastic contact piece 6 to bend the elastic contact piece 6 and contact the lower portion of the elastic contact piece 5 to close the electric circuit.

The operation of the tape cassette detecting device configured as described above will be described below. FIG. 2 shows the tape cassette 11 descending in the direction of arrow A. At this time, the erroneous erasure prevention claw detection piece 2 is in the direction of arrow B, and the tape cassette position detection piece 3 is in the direction of arrow D. Since the stationary contact piece 4, the elastic contact piece 5, and the elastic contact piece 6 are in an upright state without coming into contact with each other, each electric circuit is in an open state. FIG. 3 shows a state where the tape cassette 11 reaches a predetermined recording / reproducing position and has the erroneous erasure prevention claw 11a, and the erroneous erasure prevention claw detection piece 2 is pressed by the erroneous erasure prevention claw 11a and is in the C direction. And the elastic contact piece 5 is brought into contact with the fixed contact piece 4, and the tape cassette position detection piece 3 is pressed near the lower end of the back surface of the tape cassette 11 and rotated in the E direction. The elastic contact piece 6 is brought into contact with the fixed contact piece 4, each electric circuit is closed, and the magnetic recording tape in the tape cassette 11 is ready for recording. On the other hand, FIG. 4 shows a state in which the tape cassette 11 from which the erroneous erasure prevention claw 11a has been removed has reached the recording / reproducing position, and the tape cassette position detection piece 3 rotates in the direction of arrow E, but the erroneous erasure prevention claw 11a. Since the detection piece 2 does not rotate and the electric circuit for determining whether or not recording is possible does not close, the magnetic recording tape can be reproduced but cannot be recorded, and the information already recorded on the magnetic recording tape is erased by mistake. Can be prevented. Further, since the pressing by the tape cassette position detecting piece 3 acts in the direction of the arrow H, it does not serve as a force for separating the tape cassette 11 from the base body 9.

[0014]

[Effect of device]

 As described above, according to the present invention, the first and second switches, which are driven by contacting the back side of the tape cassette, are attached to the same housing, and the first and second switches are located at the recording / reproducing position. The tape cassette is arranged so that it is located at the position corresponding to the erroneous erasure prevention claw provided on the back side surface and at the position corresponding to the vicinity of the lower end of the back side surface, respectively. In order to detect whether or not the tape cassette is located at the recording / playback position with the second switch, it is easy to attach a switch at two places and draw the lead wire of each switch as in the conventional case. It is possible to prevent the tape cassette from being pushed up by the reaction force of the detection piece of the tape cassette position detection switch as well as being unstructured. Further, since one of the contacts forming each switch can be used as a common line as in the embodiment, the number of lead wires can be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view of a tape cassette detection device according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a state before the tape cassette of the embodiment reaches a recording / reproducing position.

FIG. 3 is a side sectional view showing a state in which the tape cassette having the erroneous erasure prevention claw of the embodiment has reached a recording / reproducing position.

FIG. 4 is a side sectional view showing a state in which the tape cassette from which the erroneous erasure prevention claw of the embodiment is removed has reached the recording / reproducing position.

FIG. 5 is a side sectional view of a conventional tape cassette detection device.

FIG. 6 is an external perspective view of a tape cassette used in a magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 Enclosure 2 Accidental erasure prevention claw detection piece 3 Tape cassette position detection piece 4 Fixed contact piece 5 Elastic contact piece 6 Elastic contact piece 9 Base 10 Pin-shaped body 11 Tape cassette 11a Erase erasure prevention claw 12 Tape cassette position detection switch

Claims (1)

[Scope of utility model registration request] 1. A first and a second switch which are driven by contacting a back side of a tape cassette which is lowered from a top to a predetermined recording / reproducing position where a reel in the cassette is engaged with a reel stand of the apparatus. And the first and second switches are respectively located at a position corresponding to an erroneous erasure prevention claw provided on the back side surface of the tape cassette located at the recording / reproducing position and a position near the lower end of the back side surface. The tape cassette detecting device is characterized in that the first switch is used to detect the presence or absence of the erroneous erasure prevention claw, and the second switch to detect whether the tape cassette is located at the recording / reproducing position. .