JPS5834590Y2 - tape recorder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reel-to-reel type tape recorder that is equipped with an editing function that is convenient for tape editing and allows the tape to run at a constant speed while the take-up reel stops rotating. This is because when an operation such as fast forwarding or rewinding is performed during an editing operation, the running of the tape is stopped regardless of the operation in order to prevent problems such as the tape being wound up in a disorderly manner on the reel. It's there.

Tape recorders equipped with the Edit J function described above can play back the tape without winding it onto a reel, so if you mark the tape while listening to the playback sound, you can immediately cut that part with a splicer and splice it again. , which is very useful for editing tapes.

During this editing operation, the tape is fed out of the take-up reel, resulting in a large slack in the tape between the recording/playback head group and the take-up reel.

Therefore, if you fast-forward or rewind during an edit operation, or if you stop tape running and then perform a fast-forward or rewind operation, the slack tape will be quickly wound onto the reel. There is a risk that the tape may be wound up in a messy manner on the reel, or worse, may be cut.

Therefore, in such a case, it may be possible to detect tape slack and automatically stop tape running.

In conventional open-type tape recorders, tape slack is detected and tape running is automatically stopped by placing a tension arm between the take-up reel and the head group that applies tension to the tape. It is used as a so-called auto-shutoff mechanism that automatically stops the tape running system when there is a large movement due to winding completion or tape slack, so it should be placed between the supply reel and the head group. I can think of something better.

However, the auto shut-off mechanism described above operates only when the tension arm detects slack in the tape, so if you perform operations such as fast forwarding or rewinding during the above editing operation, it will not work until the tension arm detects slack in the tape. During this period, an operation state such as fast forwarding occurs, causing the above-mentioned problem.

The present invention aims to solve all of these problems, and one embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is a fast forward switch, 2 is a rewind switch, 3 is a play switch, and 4 is a record switch, and these switches are comprised of push button type normally open switches.

The switches 1 to 4 have one end grounded and the other end connected to input terminals 51 to 54 of the tape running command storage circuit 50, respectively.

This memory circuit 5 also has an input terminal 5 for a command to stop tape running.
5 and output terminals 5a to 5d.

The levels of the output terminals 5a to 5d are normally high H level, but in response to the operation of the switches 1 to 4, the levels of the terminals 5a to 5d become low L level.

For example, when the play switch 3 is turned on, the level of the output terminal 5c becomes L.

Each of the output terminals 5a, 5b, and 5d has an L level.
A fast-forward circuit 6 that rotates the take-up reel T counterclockwise at high speed, a rewind circuit 7 that rotates the supply reel S clockwise at high speed, and a recording circuit 8 that enables recording. The remaining output terminal 5C is connected to a tape constant speed running drive circuit, that is, a pinch roller P, which is driven by an H level signal.
A circuit 9 is connected via an inverter 10 for bringing the tape into pressure contact with a capstan C to run the tape at a constant speed and winding it onto a winding loop T.

Next, a tension arm 11 rotatable about a shaft 11a is disposed between a group of heads H for erasing, recording, playback, etc. that the tape comes into contact with and a supply reel S. A predetermined tension is applied to the tape.

When the tape is wound up on the take-up IJ-ru T and runs out on the supply reel S, or when the tape sent out from the supply reel S becomes largely slack, the tension arm 11 rotates greatly, and a switch that is linked to the arm 11 rotates. 12 is turned on, a reset input is made to the reset terminal 5R of the memory circuit 5, and the tape recorder is brought to a tape running stop state.

Next, reference numeral 13 is an edit switch, which is composed of a switch that can maintain the on state even if the hand is removed, such as a button switch.One end of the switch is grounded, and the other end is connected to the first Nandocket 150 via the inverter 14. Connected to one of the input terminals.

The other input terminal of this Nant gate 15 is connected to the memory circuit 5.
The output terminal 5d of the inverter 1 is connected directly, and the output terminal 5c is directly connected to the inverter 1.
Connected via 0.

Further, the output terminal of the Nant gate 15 is connected to an edit circuit 16, that is, a circuit for stopping the rotation of the take-up reel T.

This Q circuit 16 operates when an L signal is input.

The output terminal of the Nandt gate 15 is connected to one input terminal a of the second Nandt gate 17, and is also connected to the other input terminal of the second Nandt gate 17 via the inverter 18 and the delay circuit 19. has been done.

This delay circuit 19 includes two transistors Trl and Tr2.
It consists of a combination of a resistor, a capacitor, and a resistor.

When the output of the first Nant gate 15 is H, one input a of the second Nant gate 17 is H1 and the other input is L. However, when the output of the first Nant gate 15 changes from H to L, 2, one input a of the nut gate 17 changes to L,
The other input changes to H.

In this case, since it takes some time for the transistor T,1 of the delay circuit 19 to discharge the charge of the capacitor C1, the input a changes from L to H from the time the input a of the second Nant gate changes from H to L. Since the time is later, the output of the second Nant gate remains at H during this delay time.

Next, when the output of the first Nandts gate 15 changes from L to H, the input a of the second Nandts gate 17 immediately changes to H.

However, in the delay circuit 19, the time when the transistor Tr2 is turned on is delayed by a time t1 determined by the capacitor C1 and the resistor R1, and therefore, for this time 11, both the two outputs of the second Nant gate 17 become H, and their output becomes L.

The output of this second Nant gate 17 is the stop command input terminal 5.
5.

While the L signal is input to this terminal 55, the output terminal 5
The levels a to 5d are all set to H.

Also, at the above time t1, the tension arm 11 is switched to the switch 1.
2 is set to the time required to perform the off operation.

In the embodiment described above, when the edit switch 13 is turned on and locked, and the play switch 3 is turned on, the reproduction circuit 9 and the edit circuit 16 are driven and an editing operation is performed.

In this state, turn on the recording switch 4, or
When another travel command operation is performed or the edit switch 13 is turned off, the output of the first Nant gate 15 becomes H, and the edit circuit 16 is no longer driven, and the output of the second Nant gate 17 is stopped for only time t1. A command is output, and then the switch 12 is turned on when tape slack is detected by the tension arm 11, so that the tape is not run at all.

Also, since terminal 5d is L during recording, edit switch 1
3 is turned on, the output of the first Nant gate 15 remains at H, and no editing operation can be performed.

When the edit switch 13 is turned on during fast forwarding or rewinding, a playback operation is performed by the function of a circuit (not shown).
Queue and review status.

As explained above, according to the tape recorder of the present invention, even if operations such as fast forwarding or rewinding are performed during an editing operation in which the tape is run at a constant speed with the take-up reel stopped, the tape will run automatically regardless of these operations. Since the tape is stopped immediately, there is no problem of the tape being wound around the reel even for a short period of time.

Furthermore, by preventing the editing operation from occurring even if an editing operation is performed during recording, it is possible to prevent the recording operation from leading to an unstable tape running state, thereby preventing recording errors.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1...Fast forward switch, 2...Rewind switch, 3
...Play switch, 4...Record switch, 5...
・Tape running command memory and retrieval, 55...Stop command input terminal, 13...Edit switch, 16...Edit circuit, 19...Delay circuit.

Claims (2)

[Scope of utility model registration request] (1) An editing means for running the tape at a constant speed while the take-up reel is stopped, a detection means for detecting slack in the tape between the supply reel and the head group, and a detection means for detecting tape slack on the supply reel side. Automatic stop means automatically stops the running of the tape when slack is detected, and when the edit button is released while the tape is being fed out of the take-up reel at a constant speed by the edit means, or When performing operations such as fast forwarding or rewinding,
A tape recorder comprising a tape running stop means for stopping tape running at least for a period of time from that point until the automatic stopping means operates. (2) The tape recorder according to claim 1, wherein the editing means is not operated while a recording operation is being performed.