JPH0313866Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a head shift mechanism for a tape player, and in particular, a tape player in which the head and pinch roller are separated from the tape and the capstan shaft and retreated to a stopped state by turning off the power. This invention relates to a head shift mechanism in which the head and pinch roller automatically move forward to enter the regeneration state when the power is turned on again.

In conventional tape players, it is known that the playback state is started manually and then the suction force of a solenoid is used to maintain the tape player in the playback state. In such a conventional type, when the power is turned off, the power supply to the solenoid that holds the head and pinch roller in the regeneration position is cut off, so that the head and pinch roller return to their original stopped state. Therefore, when the power is turned on next time, the regeneration state is manually set again, and this state is maintained by the suction force of the solenoid. However, when the power is turned off and then turned on again during the reproduction state, the original reproduction state cannot be returned immediately, so reuse is very troublesome. In particular, when it comes to in-vehicle tape players, during playback, it is often used by turning off the power switch (ignition key) on the vehicle side, getting out of the vehicle, getting back into the vehicle, and turning on the power switch. However, in such a case, even if the power switch was turned on again, the tape player could not return to its original playback state, and there was an inconvenience that playback operations had to be performed manually each time.

In order to improve this point, recently, when the power is turned on again, the tape end detection section detects that the head and pinch rollers are in the released state and the reel base does not rotate, and the tape end detection section detects that the reel base does not rotate. It has been proposed to return the tape player to the playback state by moving the head or pinch roller forward based on the tape player. However, in this conventional type, it is necessary to determine by some means whether the reel base does not rotate because the head is in the retracted position or whether the reel base does not rotate because the end of the tape has been reached, which increases the complexity of the structure. There were flaws. In addition, normally the end detection section determines that the reel base has stopped if no rotation signal is emitted from the reel base for a certain period of time. In some cases, a certain amount of time is required after the power is turned on, so the conventional type that advances the head and pinch rollers further after the judgment has been made has the disadvantage that the time from when the power is turned on until the playback operation begins is delayed. It was hot.

The present invention was proposed to solve the drawbacks of the conventional head shift mechanism, and its purpose is to cause the plunger to perform the head shift operation by giving an operation signal to the plunger for driving the head shift operation when the power is turned on. To provide a head shift mechanism for a tape player, in which a holding plunger is used to hold the head at a playback position, so that playback operation can be started immediately upon turning on the power without any special operation. be.

The present invention will now be described in detail based on illustrated embodiments.

In the figure, SOL ₁ is a plunger for driving the head shift operation, and this driving plunger SOL ₁ moves the head and pinch roller forward from the stop position toward the normal playback position. This driving plunger SOL ₁ may be one that directly moves the head or pinch roller using its suction force, or it can move the spring or motor by the action of a lever or cam that is suction-driven by the driving plunger. It is also possible to transmit a driving force to the head or the pinch roller, thereby advancing the head or the pinch roller to the reproducing position.
On the other hand, SOL ₂ is a holding plunger, and this holding plunger SOL ₂ is a plunger for holding the head and pinch roller in the same position that have been advanced to the playback position by the driving plunger SOL ₁ . It is. When the power is turned on, this holding plunger SOL ₂ starts suction operation and supports the head and pinch roller in a regenerated state, and when the power is turned off, the suction is released and the head and pinch roller return to the stopped position. be.

A plunger drive circuit 1 is connected to the drive plunger SOL ₁ , and the drive plunger SOL ₁ is driven by suction based on a command from the plunger drive circuit 1. A one-pulse generation circuit 2 such as a monostable multivibrator is connected to the plunger drive circuit 1, and the one-pulse generation circuit 2 is further connected to a power supply voltage rise detection circuit 3 connected to a power supply.

The head shift mechanism of the present invention has the above-mentioned configuration, and its operation will be explained next.

First, in the normal playback state, the head and pinch roller advance to the playback state and are held in that position by the holding plunger _SOL2 . If the power is turned off in this state, the holding plunger will
The current to SOL ₂ is cut off, and the head and pinch roller held by this holding plunger SOL ₂ retreat and return to the stopped position. Thereafter, when the power is turned on again, the detection circuit 3 senses the rise of the power supply voltage, and outputs a signal for operating the one-pulse generation circuit at the time when the power supply voltage rises to a predetermined voltage. Since the one-pulse generation circuit is composed of a monostable multivibrator or the like, it receives the signal from the rise detection circuit 3 and outputs the signal to the plunger drive circuit 1 for a certain period of time. The plunger driving circuit 1 drives the driving plunger for a certain period of time based on the signal output for one hour from the one-pulse generating circuit 2, and the driving plunger advances the head and the pinch roller toward the regenerating state. In this way, after the head and pinch roller reach the regeneration position, the holding plunger
SOL ₂ is energized and the playback state is maintained.

As shown in the above embodiments, the configuration of the present invention detects the rise of the power supply voltage when the power is turned on, and
Since the driving plunger is immediately energized and the head and pinch roller are moved to the forward position, there is no need to manually set the tape player to playback mode each time the power is turned on, unlike in the past.
This has the effect of making it extremely easy to reuse the tape player. In particular, for car tape players, the ignition key, which is the power switch,
Since the tape player can be automatically switched between playing and stopping by simply turning it on and off, there is no need to control the tape player every time you get into the vehicle, making tape player operation extremely easy. Furthermore, if the mechanism of the present invention is used in a tape player where the power is turned on when a tape is inserted, the tape player will be immediately set to playback mode just by inserting a tape, so that the so-called tape insertion time will be reduced. It also has the effect of enabling automatic play.

It should be noted that the present invention is not limited to the above-described embodiment, but can also be implemented in a system in which suction and suction operations are performed by the same solenoid.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an example of the head shift mechanism according to the present invention. SOL ₁ : Drive plunger, SOL ₂ : Holding plunger, 1: Plunger drive circuit, 2:1
Pulse generation circuit, 3: Power supply voltage rise detection circuit.

Claims (1)

[Scope of utility model registration request] In a tape player in which the plunger advances the head or pinch roller to the playback position and then holds the head or pinch roller at the playback position, a power supply voltage rise detection circuit is connected to the plunger drive circuit, and when the power is turned on, A head shift mechanism characterized in that a plunger is operated in suction mode for a certain period of time based on a command from a power supply voltage rise detection circuit to advance a head and a pinch roller to a regeneration position.