JPH042450Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cassette tape eject safety device.

[Technical background of the invention and its problems]

In a cassette tape recording/playback device, when the head and pinch roller are retracted from the cassette tape in any state other than the stopped state, in other words, in the playback/recording state, when selecting the beginning of a song, or when on standby for playback/recording, etc. In other words, the cassette tape ejection operation is disabled.

A large number of technologies have been developed for this type of eject safety device, and a future challenge is to simplify the eject safety device for cassette tapes.

[Purpose of invention]

As mentioned above, the present invention aims to simplify the eject safety device for cassette tapes.

[Summary of the idea]

The cassette tape eject safety device of the present invention prevents ejection of the cassette tape when the head and pinch rollers are extended toward the cassette tape installed in a cassette tape recording/playback device, and also prevents the ejection of the cassette tape from the head and pinch rollers. A cassette tape eject safety device that allows the cassette tape to be ejected when the roller is retracted, the device being a cassette tape eject safety device that allows the cassette tape to be ejected from a blocking position that prevents the cassette tape from being ejected by the eject operation. a head base that moves between a stop position and a recording/playback position to advance and retreat the head and pinch roller toward the cassette tape; a moving member that advances and retreats in conjunction with the head base; The head base is rotatably provided between a lock position that fixes the actuating body in the blocking position and a release position that allows operation of the eject actuating body, and as the head base moves from the play/record position to the stop position. A lock body that is rotated from a lock position to a release position via a moving member, and a lock body that is interposed between this lock body and the eject actuating body to urge the lock body toward the lock position and to block the eject actuating body. The device is characterized in that it includes one spring that biases in the position direction.

[Example of idea]

The present invention will explain the cassette tape eject safety device in detail based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a main body of a cassette tape recording/playback device, and a mounting part 2 for a cassette tape C is provided at the front of the main body 1. A cover 3 is attached to this mounting part 2 via a support shaft 4. A holding frame 5 for the cassette tape C is provided inside the cover 3, and when the cover 3 is open, the cassette tape C can be inserted into the holding frame 5 from above. ing. Note that the cover 3 is always urged in the opening direction by a spring (not shown).

Reference numeral 8 denotes a board provided vertically inside the mounting section 2, and as shown in FIG. 9 includes a plurality of elongated holes 10 and a plurality of protrusions 11 protruding from the front part of the substrate 8.
The eject operating plate 9 is supported in a vertically movable manner by engagement with the eject operating plate 9, and has a locking pawl 12 that engages with and disengages from the upper end of the holding frame 5 inside the cover 3, and an upper side portion of the base plate 8. A pushing piece 15 is provided for the actuating piece 14 of the plurality of detection switches 13 provided on the eject actuating plate 9, and a pin 17 is provided protruding from the left side of the eject actuating plate 9 via a mounting member 16. A pushing body 18 is swingably supported on the support shaft 4, and an eject button 19 is provided at the front of the main body 1, located in front of the pushing body 18.

Further, as shown in FIG. 2, a head base 24 supporting an erasing head 22 and a playback/recording head 23 is provided at the lower center of the front surface of the board 8, and is movable up and down. A pinch roller 25 that moves up and down in conjunction with the head base 24 is provided on the right side, and a cab stan 26 for this pinch roller 25 is provided on the base plate 8, and furthermore, a moving member 27 is provided at the center of the rear surface of the base plate 8 and is movable up and down. It is set in.

Note that the head base 24 and the moving member 27
are both moved by the same drive mechanism, and when the head base 24 is completely lowered, that is, the heads 22, 23 and the pinch roller 25 are completely retracted from the cassette tape C. At times, the moving member 27 is arranged to rise in reverse.

Further, as shown in FIG. 2, one of the protrusions 11 is located between the base plate 8 and the eject operating plate 9, and a lock plate 30 as a lock body supports the eject operating plate 9 in a vertically movable manner. An engaging piece 31 bent rearward from the right end of the lock plate 30 is engaged with the upper side of a protrusion 32 formed on the left side of the moving member 27. At the same time, a lock piece 33 bent forward from the lower end of the lock plate 30 is adapted to engage and disengage from a recess 34 formed on the right side of the eject operating plate 9.

A notch 37 is formed at the upper left side of the eject operating plate 9, a protrusion 38 is formed at the bottom of the notch 37, and a protrusion 38 is formed to bend forward from the left end of the lock plate 30. A protruding piece 39 is protruded from the upper part of the notch 37, and a coil spring 40 is provided in a compressed state between the protruding piece 39 and the protrusion 38, and the coil spring 40 causes the lock plate 30 to The eject operating plate 9 is biased clockwise, that is, in the direction in which the lock piece 33 engages with the recess 34 of the eject operating plate 9, and the eject operating plate 9 is biased downward, that is, the locking claw 12 is biased toward the holding frame inside the cover 3. It is biased in the direction of engagement with the upper end portion of 5.

Next, the operation will be explained.

In addition, in FIG. 1, the cassette tape C is held by the holding frame 5, the cover 3 is closed, and the holding frame 5 is locked by the locking pawl 12 of the eject operating plate 9 in the lowered position. This shows that the tape C is mounted on the mounting section 2 and is ready for playback, so this state will be explained first.

In this state, when a recording/playback mode other than the stop mode is set by operating an operation switch (not shown), the head base 24 rises to the recording/playback position as shown in FIG.
2, 23 and the pinch roller 25 rise to reach the cassette tape C, and the head base 2
Moving member 2 moved by the same drive mechanism as 4
7 is lowered, and as a result, the lock plate 30 is rotated clockwise by the biasing force of the spring 40 and moved to the locking position, and the lock piece 33 is in the lowered state, that is, the cover is moved by the biasing force of the spring 40. The ejector plate 9 is engaged with the recess 34 of the ejector plate 9 which has moved to the blocking position to prevent the ejector plate 9 from opening, and the ejector plate 9 cannot be raised.

Therefore, as shown in FIG. 2, in a recording/playback mode in which the head base 24 is raised to the recording/playback position, the cover 3 cannot be opened to eject the cassette tape C.

When recording/playback ends or the stop mode is entered by operating an operation switch (not shown),
The head base 24 is lowered from the recording/playback position shown in FIG. 2 to the stop position, and the heads 22, 23 and pinch roller 25 are lowered and retracted from the cassette tape C, and are moved by the same drive mechanism as the head base 24. The moving member 27 is raised from the position shown in FIG.
The protrusion 32 of 7 pushes the engagement piece 31 of the lock plate 30 upward, and the lock plate 30 rotates counterclockwise around the protrusion 11 from the locked position (shown by the solid line) to the released position ( (indicated by a two-dot chain line), the lock piece 33 is removed from the recess 34 of the eject operating plate 9, and the eject operating plate 9 can be raised.

Therefore, when the head base 24 is lowered to the stop position, when the eject button 19 is pressed, the pushing body 18 rotates rearward and upward about the support shaft 4, pushing up the pin 17, thereby pushing up the pin 17. , the eject operating plate 9 rises to the permissible position that allows the release of the cover 3, the locking claw 12 is separated from the holding frame 5, the holding frame 5 and the cover 3 are opened by a spring (not shown), and the cassette tape C is opened. Can be taken out.

The plurality of switches 13 provided on the upper part of the board 8 are for detecting the presence or absence of the cassette tape C, the type of the loaded cassette tape C, and whether or not the signal of the loaded cassette tape C can be erased.
The operating piece 14 of the switch 13 is designed to engage with the upper end of the attached cassette tape C, but when the cover 3 is opened, the eject operating plate 9
Since the pushing piece 15 of the switch 13 pushes the actuating piece 14 of the switch 13 upward and away from the cassette tape C, the switch 13 etc. are not affected, and when the cassette tape C is installed, the cover 3 closes, the upper end of the holding frame 5 comes into contact with the lower surface 12a of the locking claw 12, and the eject operating plate 9 rises via the locking claw 12 due to the inclination of the lower surface 12a. Since the pushing piece 15 of the actuating plate 9 pushes the actuating piece 14 of the switch 13 away from the cassette tape C, the switch 13 etc. are not affected.

In this way, one spring 40 biases the eject operating plate 9 downward and the lock plate 30 clockwise.
The structure of the cassette tape eject safety device can be simplified.

[Effect of idea]

As described above, according to the present invention, one spring serves as both the spring that biases the eject operating body and the spring that biases the lock body that locks the eject operating body, so that the eject safety device of the cassette tape can be secured. The structure of the device can be simplified, and the device can therefore be made smaller.
Since the troublesome work of installing springs is reduced and the number of parts is reduced, the device can be made at a lower cost.

[Brief explanation of the drawing]

The figures show the cassette tape eject safety device of the present invention, FIG. 1 is a longitudinal sectional view of the cassette tape recording/playback device, and FIG. 2 is a front view of the main parts thereof. C...cassette tape, 9...eject actuating plate as an eject actuating body, 22, 23...head, 24...head base, 25...pinch roller, 27...movable member, 30...lock as a lock body Board, 40...spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A head and a pinch roller installed in a cassette tape recording/playback device prevent ejection of the cassette tape in a state in which the head and the pinch roller extend toward the cassette tape, and the head and the pinch roller retreat from the cassette tape. A cassette tape eject safety device that allows the cassette tape to be ejected when the cassette tape is in a state where the cassette tape is ejected, and the eject operation moves the cassette tape from a blocking position that prevents the cassette tape from being ejected to an allowable position that allows the cassette tape to be ejected. An eject operating body, a head base that moves between a stop position and a recording/playback position to move the head and pinch roller forward and backward toward the cassette tape, a moving member that moves forward and backward in conjunction with the head base, and the eject operating body. The movable member is rotatably provided between a lock position where the head base is fixed at the blocking position and a release position where the eject actuating member is allowed to operate, and the movable member is moved as the head base moves from the playback/recording position to the stop position. A lock body is rotated from a lock position to a release position through a lock body, and a lock body is interposed between this lock body and the eject actuating body to bias the lock body toward the lock position and move the eject actuating body toward the blocking position. A cassette tape eject safety device characterized by comprising one biasing spring.