JPS5912768Y2 - Power outage recovery device for magnetic recording and playback machines - Google Patents

Description

[Detailed description of the invention] This invention is a magnetic recording/playback machine in which various operating states can be electrically obtained via a relay or the like by light pressing of a push button. ,
The present invention relates to a power failure recovery device for a magnetic recording/playback machine that allows continuous tape playback running.

Conventionally, for magnetic recording and reproducing machines used to send out music, etc. at cable broadcasting stations, even if tape playback is stopped due to a power outage, tape playback automatically continues after power is restored. Although such functionality has been desired, it has been difficult to achieve this functionality using mechanical means, as the magnetic recording and reproducing apparatus uses relays or the like to control each operating state.

The present invention realizes such conventional demands, and embodiments thereof will be described below with reference to the drawings.

Reference numeral 1 denotes a playback button for operating tape playback, and reference numeral 1a indicates a normally open button for the playback button 1, which is connected to the power source 2 via a normally closed contact 3a that responds to the safety switch 3 and a normally closed contact 4a that responds to the stop button 4. Contacts 5 are relay coils for driving the tape playback drive; 6 are playback drive memory contacts that respond to either the set relay coil 8 or the reset relay coil 9 of the memory relay 7; TRI, TR2, and TR3; A switching transistor, DI, is connected to each of the relay coil 5, the set relay coil 8, and the reset relay coil 9, and controls excitation and de-excitation thereof.

D2 is a unidirectional diode, R1, R1', R2, R2'
, R3, R3' are resistors.

As a non-volatile reproducing memory member, the memory relay 7 is a so-called 2-layer structure in which the setting relay coil 8, the resetting relay coil 9, the reproducing travel memory contact 6, and a permanent magnet (not shown) are housed in an integrated case. A wire-wound latching relay holds the movable plate of the regenerative travel memory contact 6, which is activated by temporary excitation of the setting relay coil 8, on a permanent magnet, so that even when the setting relay coil 8 is de-energized, the The movable plate of the reproducing travel memory contact 6 does not return to its original position, and in order to return the movable plate, the resetting relay coil 9 may be energized.

Further, the magnetic recording/playback device runs or stops using contacts (not shown) that open and close in conjunction with the operation of the relay coil 5 for driving the tape playback.

The operation and effect of the above configuration will be explained.

When the regeneration button 1 is pressed while the power supply 2 is being supplied, the normally open contact 1a is closed, the transistor TR2 is turned on, and the setting relay coil 8 is momentarily excited, and the setting relay coil 8 is activated. The contact 6 for reproducing travel memory is switched to the closed state, and then the permanent magnet (not shown) of the memory relay 7 maintains the closed state of the contact 6 for reproducing travel memory, so that the transistor TR1 becomes conductive and the relay The coil 5 is energized and a tape playback drive member (not shown) is driven to start tape playback.

In this state, if a power outage occurs, the power supply 2 is not supplied, the relay coil 5 is de-energized, and the drive of the tape playback drive member is stopped. However, the closed state of the playback travel memory contact 6 is It continues even during a power outage because it has nothing to do with this.

After that, when the power supply 2 is restored and the supply is resumed, since the playback running memory contact 6 is in the closed state, the transistor TRI becomes conductive and the relay coil 5 is energized to drive the tape playback drive member.

Next, the operation of stopping the normal tape playback and the operation of the safety switch 3 when winding the tape or cutting the tape will be explained.

When the stop button 4 is pressed while the tape is being played back, the normally open contact 4b of the stop button 4 is instantaneously closed, current flows through the one-way diode D1 to the base of the transistor TR3, and the transistor TR3 becomes conductive. As a result, the reset relay coil 9 is instantaneously excited, and the regeneration travel memory contact 6 that responds to the reset relay coil 9 rejects the attraction action of a permanent magnet (not shown) and remains open, and the relay coil 9 becomes de-energized and tape playback stops.

In addition, the normally open contact 3 is opened by the operation of the safety switch 3.
When b is closed, a current flows through the transistor TR3 through the one-way diode D2, and the transistor TR3 becomes conductive, thereby stopping tape reproduction in the same manner as the stopping operation by the stop button 4.

As described above, the present invention has an extremely simple circuit configuration that allows continuous tape playback to be maintained after a power outage has been recovered, and has high operational reliability. It has the advantage of being able to be used as both.

Another effect is that a latching relay with mechanical contacts is used as the playback memory member, so
It operates reliably even during momentary power outages and does not malfunction.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. 1...Play button, 2...Power, 5...
...Relay coil, 6...Contact for regeneration driving memory, 7...Memory relay, 8...Relay coil for setting, 9...For reset relay coil.

Claims (2)

[Scope of utility model registration request] (1) In a magnetic recording/playback device whose operating state is electrically controlled, a play button, a stop button, and whether the tape connected to the play button and stop button is in a playback running state or a stopped state. 1. A power outage recovery device for a magnetic recording/playback machine, comprising a non-volatile playback/travel storage member that retains memory. (2) A power failure recovery device for a magnetic recording/reproducing machine as set forth in claim 1, wherein the non-volatile reproduction running memory member is a two-winding latching relay.