JPS5813471Y2 - Reciprocating cassette tape recorder - Google Patents

Description

[Detailed description of the invention] This invention is a so-called reciprocating cassette tape that allows recording and playback even when the magnetic tape is run in either the forward direction (normal direction) or the reverse direction (reverse direction). This invention relates to recorders, and particularly improves the device for preventing accidental erasure.

Conventionally, the magnetic tape erase prevention device in this type of reciprocating cassette tape recorder is designed to detect the normal direction and the reverse direction of the magnetic tape running direction using separate accident prevention switches, and in the reverse mode, the magnetic tape is switched from the normal direction to the reverse direction. If there is an accidental erasure prevention tab on the tape supply side of the tape cassette and the accidental erasure prevention switch operates in the recordable state when switching from the reverse direction to the normal direction, the tape enters recording mode and is in a non-recordable state. In this case, the magnetic tape is configured to stop running, but if there is an accidental erasure prevention tab on the tape cassette's feeding side, the accidental erasure prevention tab on the winding side is broken off. However, since it is possible to perform running recording on the magnetic tape in the normal direction, there arises the problem that different contents are recorded on the magnetic tape in the normal direction and in the reverse direction.

Therefore, the present invention is configured so that reverse recording can be performed only when the accidental erasure prevention tabs on both sides of the tape cassette are present, that is, only when the accidental erasure prevention switches on both sides detect the recordable state.

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

Figure 1 shows →U of a reciprocating tape recorder to which the present invention is applied.
1 shows the external view of the tape recorder body, 2 the tape cassette mounting part, and the reel shaft 4 which is the supply side or the winding side in the normal direction or reverse direction of the tape during recording and playback, and the winding side or the supply side, respectively. It has a reel shaft 5 on the side,
Further, on the schematic side of the magnetic head device 6, there is a pair of capstans T and 8 that rotate in opposite directions, and a switching lever 9 of a so-called running reversal mechanism that reverses the running of the tape back and forth.
A pair of pinch rollers 10 and 11 are mounted on the capstans 7 and 8 and are in pressure contact with the capstans 7 and 8 in a converting manner.

This travel reversal mechanism is set to normal 'ti! auto reverse changeover switch 12! 112a to reverse side 12b, and switch mode selector switches 1 and 3 to normal side 13.
a Color reverse IIJI 3 b or continuous reverse side 1
If it is switched to 3c, reverse drive is automatically performed by a signal from the means for detecting when the magnetic tape reaches its end, and the magnetic tape is run in the reverse direction.
Further, when the mode selector switch 13 is switched to the normal side 13aK, reverse drive is not performed and the magnetic tape is stopped when it has been run to the end.

The running direction of the magnetic tape in the above case is displayed by the indicator lamp 14.

Reference numeral 15 indicates operation buttons, from the left in the figure: a rewind button 15a, a stop button 15b, a forward button 15c, a fast forward button 15d, and a record button 1.
5e and a pause button 15f are provided in series.

Furthermore, when the tape cassette 16 is installed in the tape cassette loading section 2, there are accidental erasure prevention tabs 1T and 1B on both sides of the rear surface of the tape cassette 16.
The detectors 19 and 20 are connected to accidental erasure prevention switches 21 and 22, respectively, and the switches 21 and 22 are used to prevent accidental erasure of the tape cassette 16. Turn on if claws 17 and 18 exist, turn off if they are broken off,
A recording determination signal output means, which will be described later, is operated to operate a magnetic tape recordability mechanism (not shown).

This recording determination signal output means may be constructed as shown in FIG. 2, for example.

That is, it has first, second, and third NOR gate circuits 23, 24, and 25 and an OR gate circuit 26, and the input of the first NOR gate circuit 23 is connected to the output of the erroneous erasure prevention switch 21 and the normal side 13a of the mode changeover switch 130. At the same time, the output of the auto-reverse changeover switch 12 is supplied via the inverter 21, and the second NOR gate circuit 24 is supplied with the output of the accidental erasure prevention switch 22, the output of the auto-reverse changeover switch 12, and the mode changeover switch. The outputs of the normal side 13a of the 130 are supplied to the third NOR gate circuit 25, the outputs of the accidental erasure prevention switches 21 and 22, and the reverse side 1 of the mode selector switch 13 are supplied to the third NOR gate circuit 25.
3b and continuous reverse side 13c are respectively supplied.

Furthermore, these first, second, and third NOR gate circuits 23, 24
The outputs of 25 and 25 are supplied to an OR gate circuit 26, and the OR gate circuit 26 is configured to output a recording determination signal.

If you wish to perform reverse recording with this example tape recorder, set the auto reverse selector switch 12 to the reverse side 12b.
At the same time, the mode selector switch 13 is switched to the reverse side 13b, and the forward button 15c and the record button 15d of the operation buttons 15 are operated.

In this case, if both tape cassettes 160 have accidental erasure prevention tabs 1T and 18, these tabs 1T and 18
The first and second accidental erasure prevention switches 21 and 22 are both turned on by the detection by the accidental erasure prevention tabs 19 and 20, and therefore the first and second NOR gate circuits 2
The outputs of 3 and 24 become ``0'', and the output of the third NOR gate circuit 25 becomes ``(ij''), so the output of the OR gate circuit 26 is 1'', and a recordable signal is output, and the magnetic field built in the tape cassette 16 is Reverse recording is performed on the tape.

In addition, there is an erroneous erasure prevention claw 17 on one side (supply side) of the tape cassette 16, and an erroneous erasure prevention claw 1 on the other side (winding side).
8 is broken off, the first accidental erasure prevention switch 21 is turned on and the second accidental erasure prevention switch 22 is turned off, so that the first and second NOR gate circuits 23 and 24
Both outputs are tt On, and the third NOR gate circuit 2
The output of 5 also becomes tt Opp, so the OR gate circuit 2
6 becomes 0'', no recordable signal is outputted, and it is not possible to record on the magnetic tape in the tape cassette 16.

Note that if one of the accidental erasure prevention tabs 17 of the tape cassette 16 is broken off and the other accidental erasure prevention tab 18 is present, the first accidental erasure prevention switch 21 is turned off and the second accidental erasure prevention switch 22 is turned on. Therefore, in this case as well, OR gate circuit 2
Of course, the output of No. 6 becomes at Opp, and no recordable signal is obtained.

Also, like this, the accidental erasure prevention tab 17 of the tape cassette 16
, 18 is broken off, set the side where the accidental erasure prevention tab exists to the supply side, and switch the auto reverse selector switch 12 to the normal side 12a and the mode selector switch 13 to the normal side 13aV.
If you perform a recording operation with c switched, the first
Since the erroneous erasure prevention switch 21 is turned on, the output of the first NOR gate circuit 23 becomes l", the outputs of the second and third NOR gate circuits 24 and 25 become 0", and therefore the output of the OR gate circuit 26 becomes "1". A recordable signal "1" is obtained, and normal recording is performed on the magnetic tape in the tape cassette 16.

As described above, in this example tape recorder, if either of the accidental erasure prevention tabs 17, 18 of the tape cassette 16 is broken off, reverse recording on the built-in magnetic tape cannot be performed; Normal recording can be performed if there is an erroneous erasure prevention tab in the feeding direction.

As described above, the tape recorder according to the present invention performs reverse recording only when the magnetic tape built into the tape cassette has thumbtack erasure prevention tabs on the normal side and reverse side of the tape cassette, that is, when recording is possible in both directions. In addition, if only one of the tape cassette's accidental erasure prevention tabs is present, only normal recording can be performed, so the magnetic tape in the tape cassette will not record anything different from the operating mode. There is no risk of the reverse recording occurring, and reverse recording can be performed accurately.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted line plan view of a tape recorder to which the present invention is applied, and FIG. 2 is a line diagram showing an example of an erroneous erasure prevention device to which the present invention is applied. In the figure, 1 is the tape recorder body, 2 is the tape cassette loading section, 12 is the auto-reverse switch, 13 is the mode switch, 16 is the tape cassette, 17.18 is the accidental erasure prevention tab, and 19.20 is the accidental erasure prevention tab. Detector, 2
1.22 is an erroneous erasure prevention switch, 23, 24.25 is a NOR gate circuit, 26 is an OR gate circuit, and 2T is an inverter.

Claims (1)

[Scope of utility model registration request] first and second accidental erasure prevention claw detection means corresponding to a pair of accidental erasure prevention claws arranged on the supply side and the winding side of the tape cassette; and a first accidental erasure prevention claw detection means linked to the respective accidental erasure prevention claw detection means. 1 and a second erroneous erasure prevention switch, a normal-reverse mode changeover switch, and a recording judgment signal output means operated by the on/off operation of the erroneous erasure prevention switch and the switching of the mode changeover switch. At times, by detecting the erroneous erasure prevention tab on one side of the tape cassette, and at the time of reverse recording, by detecting the erasure prevention tabs on both membranes of the tape cassette, recording can be performed when the recording is possible. A reciprocating cassette tape recorder characterized by: