JPS59218648A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the double recording by having such a circuit constitution where no repeating action is performed in a recording mode even though a repeat switch is on. CONSTITUTION:When a tape reaches its initiation in a tape rewind mode, the H output of a NOR gate 9 is inverted into an L signal via an inverter 16 and supplied to an input terminal 5b for tape constant speed drive command of a control circuit 5 if a repeat switch 10 is kept on. Thus a recording/reproducing device is automatically reset to a reproduction mode. In a record mode the output terminals 5e and 5f of the circuit 5 are set at L levels with push of a record command switch 1 and a tape constant speed drive command switch 2. When the tape reaches its termination, in said record mode, the H output of a NOR gate 8 is applied to a NAND gate 14 as long as the switch 10 is kept at an ON position. However the input terminal of the other side of the gate 14 has a record instruction and set at L level. Thus the output of the gate 14 is set at H level, and the signal is inverted to an L signal via a diode 15 and an inverter 13 to be supplied to a stop command input terminal 5c. As a result, the recording/reproducing device is automatically set into a stop mode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and particularly to a magnetic recording and reproducing device having a repeat function.

Conventionally, magnetic recording and reproducing devices with a repeat function are based on a reciprocating type of device, in which the tape constant speed running direction is switched at the end of the tape and at the same time the connection of the recording and reproducing head is also switched to record and reproduce the tape. The tape can be played repeatedly by switching tracks. However, in this type of apparatus, the tape must be run at a constant speed in both forward and reverse directions, resulting in a complicated structure and high cost.

Therefore, in the present invention, when the tape reaches the end, the tape is rewound at an arbitrary position and played back, thereby realizing a device with a repeat function of a simple configuration and recording operation with this repeat function activated. When this is done, the device is automatically stopped at the end of the tape to prevent double recording.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a recording command switch, 2 is a tape constant speed running command switch, 3 is a stop command switch, and 4 is a rewind command switch. One contact of these switches 1 to 4 is grounded, and the other contact is grounded. The control circuit 6 is connected to travel command input terminals 5d to 5d of a control circuit 6 comprised of a memory circuit such as a flip-flop circuit, a logic circuit, and the like. It goes without saying that these input terminals 68 to 5d are respectively a recording command input terminal, a tape constant speed running command input terminal, a stop command input terminal, and a rewinding command input terminal. Reference numerals 50 to 6f denote output terminals of the control circuit 5, which are a recording command output terminal, a tape constant speed running command output terminal, and a rewinding command output terminal.

Reference numeral 6 denotes a tape running drive mechanism unit including a recording/reproduction switching circuit, which receives the output from the control circuit 5 and causes the magnetic tape (not shown) to run at a constant speed in the recording state or at a constant speed in the playback state. It is designed to be able to read, rewind, and stop running.

Reference numeral 7 denotes a tape end detection circuit which outputs an L level signal when the magnetic tape reaches either the end or the beginning. The output of this tape end detection circuit 7 is applied to one input terminal of NOR gates 8 and 9, and the output terminal esf of the control circuit 5 is applied to the other input terminal of these NOR gates 8 and 9.
A tape constant speed running command signal and a tape rewinding command signal from 5g are respectively applied. These N
The output ends of the OR gates 8 and 9 are connected to a movable contact of a repeat switch 10. This repeat switch 10 is composed of two switches 10a and 10b that work together. The above repeat switch 10a.

The off contacts 10b are commonly connected through diodes 11 and 12, and further connected through an inverter 13 to a stop command input terminal 5C. Also repeat switch 10a
The on-contact point of is connected to one input terminal of a NAND gate 14, and the other input terminal of this NAND gate 14 is connected to a recording command output terminal 5e.

Further, the output terminal of the NAND gate 14 is connected to the rewinding command input terminal 5d, and is also connected to the input terminal of the inverter 13 via a diode 16. Furthermore, the on-contact point of the repeat switch 1ob is connected to the tape constant speed running command input terminal 6b via the inverter 16.

Note that 17 to 19 are resistors connected between the on contact of the repeat switch 10a and the ground, between the input end of the inverter 13 and the ground, and between the input end of the inverter 16 and the ground, respectively.

The operation of the above embodiment will now be explained.

First, regarding the control circuit 5, the levels of its output terminals 58 to 6q are normally all H level in the so-called stopped state.
For example, when the tape constant speed running command switch 2 is momentarily pressed to set the tape constant speed running command input terminal 5b of the control circuit 5 to the L level, the command is stored in the control circuit 5 and the tape constant speed running command output terminal 6f The level of is inverted from H to L. That is, the output terminal of the control circuit corresponding to the operated travel command switch is set to the L level. When the stop command switch 3 is pressed, the memory contents of the control circuit 5 are reset and the output terminals 58 to 5q are
The levels of all are set to return to H.

When the output terminal 6f of the control circuit 5 goes to the L level, the tape running drive mechanism 6 causes the magnetic tape to run at a constant speed, and the apparatus enters the playback state.

When the tape reaches the end in this state, the tape end detection circuit 7
The output of NOR gate 8 becomes L level, and the output of NOR gate 8 is also inverted from L to H. At this time, when the repeat switch 1o is in the off position, the H output of the two-part NOR gate 8 is supplied to the inverter 13 via the diode 11, which inverts it to an L signal, and this L signal is sent to the control circuit. The signal is supplied to the stop command input terminal 5C of No. 5, and the device automatically comes to a stop state.

Further, when the H signal is output from the NOR gate 8, if the repeat switch 1o is in the on position, the NOR
The H output of the R gate 8 is applied to one input terminal of the NAND gate 14, and at this time, the other input terminal of the NAND gate 14 is at the H level, so the output of the NAND gate 14 is at the L level, and this L Level signal is control circuit 5
is supplied to the tape rewind command input terminal of , and the device automatically enters the rewind state.

In this rewinding state, when the tape reaches the starting end, the L signal of the tape end detection circuit 7 is inputted to the NOR gate 9 together with the L output of the rewind command output terminal 6q of the control circuit 5, and the output is set to the H level. .

At this time, if the repeat switch 10 is returned to the OFF position, the H output of the NOR gate 9 shown in - is connected to the diode 12.
, is supplied to the stop 1-command input terminal 6C of the control circuit 5 via the inverter 13, and the device automatically enters the stop state.

However, when the tape reaches the starting end in the tape rewinding state, the repeat switch 1o is in the on position.
, the H output of the NOR gate 9 is connected to the inverter 16.
The signal is inverted to an L signal and supplied to the tape constant speed running command input terminal 6b of the control circuit 6, and the apparatus automatically returns to the playback mode.

In this way, when the repeat switch 10 is off, the device automatically stops at the end of the tape, but when the repeat switch 10 is on, rewinding occurs at the end of the tape, playback occurs at the beginning of the tape, and the device automatically stops at the end of the tape. Repeated playback operations are performed between the ends. It goes without saying that if the tape end detection circuit 7 includes a tape counter circuit, repeated playback operations between the tape end and any tape position, or between two arbitrary tape positions, can be performed. Momoi.

By the way, when the recording command switch 1, the tape constant speed running command switch 1, and the tape running command switch 2 are pressed to set the output terminals 5e and 5f of the control circuit 5 to the L level, the apparatus enters the recording operation state. When the tape reaches the end in this recording operation state, as in the playback operation state mentioned above,
The output of NOR gate 8 becomes H level. Therefore, at this time, if the repeat switch 1o is in the OFF position, the apparatus automatically returns to the stopped state. Even if the beat switch 1o is in the on position, the device automatically comes to a halt. That is, when the repeat switch 1o is in the on position, the H output of the NOR gate 8 is NAND.
Although it is added to gate 14, at this time, NAND gate 1
Since the other input terminal of NAND gate 14 is a recording command and is at L level, the output of NAND gate 14 is at H level.
This H level signal is transmitted from the diode 15 to the inverter 13.
Since the signal is inverted to an L signal and supplied to the stop 1-command input terminal 5c of the control circuit 6, the device automatically enters the stop state.

Incidentally, in the above embodiment, explanations regarding fast forwarding and temporary stopping are omitted, but naturally these functions are also provided. Further, in the above embodiment, the repeat operation is always disabled from the recording operation state, but it goes without saying that a selection switch may be provided to enable or disable the repeat operation.

As explained above, according to the magnetic recording/reproducing device of the present invention, even if the repeat switch is in the ON state, the repeat operation is not carried out against the user's will in the recording operation state, and the repeat operation is not carried out against the user's will. Duplicate recording can be prevented. In particular, when performing so-called timer recording, in which recording is automatically performed when the timer is set, if the recording time or tape length is incorrect, other information may be mistakenly recorded on top of the timer-recorded content. This eliminates the need for multiple recordings.

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[Brief explanation of the drawing]

The figure is a circuit diagram showing one embodiment of the present invention. 1... Record command switch, 2... Tape constant speed running command switch, 3... Stop command switch, 4... Tape rewind command switch, 5・
... Control circuit, 6 ... Tape travel drive mechanism section, 7 ... Tape end detection circuit, 10 ...
...Repeat switch.

Claims (1)

[Claims] a tape end detection circuit that operates when the tape reaches its end while the tape is running at a constant speed; a first control circuit that outputs a rewinding command to automatically rewind the tape based on the output of the tape end detection circuit; a second control circuit that operates when the tape reaches an arbitrary position in the tape rewinding state caused by the first control circuit to automatically shift the device to a tape constant speed running state; A repeat switch sets the second control circuit to an operable state, and even if this repeat switch is on, if the tape is running at a constant speed in the recording state, the output from the double tape end detection circuit is activated. A magnetic recording and reproducing device equipped with an automatic stop circuit that automatically stops tape running.