JPS6230165Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an erroneous operation prevention device for a record player that is configured to invalidate even if a record size setting operation is performed by mistake while a record is being played.

After setting the record size, if you perform the start operation, the tone arm will automatically move to the introduction groove of the record and descend, and when the record is finished playing, the tone arm will automatically move to the armrest stand. A so-called fully automatic record player that returns to normal mode is well known. By the way, if you accidentally set the record size while playing a record, the record size setting is related to the movement of the tone arm from the armrest base to the lead-in groove of the record. The setting operation itself does not interfere with record playback, but if the record size is set by operating a plunger, the record player itself will adjust in response to the plunger being driven. This will cause the inconvenience of vibration. The present invention is devised so that the plunger is not driven in any way even if the record size setting operation is performed while the record is being played.

Hereinafter, a detailed description will be given with reference to embodiments shown in the drawings.
Reference numeral 1 denotes a record size setting lever, which is rotatable around a support shaft 1a. A pin 1b stands at the tip of the size setting lever 1, and this pin 1b is connected to one end 2a of the locking piece 2 fixed to the chassis.
Alternatively, it is set at a position where it abuts the other end 2b.
That is, one end of the spring 3 and the operating piece 4a of the plunger 4 are fixed to the size setting lever 1.
When the plunger 4 is in the OFF state, the pin 1a comes into contact with the one end 2b of the locking piece 2 due to the elastic force of the spring 3, and when the plunger 4 is in the ON state, the pin 1b is brought into contact with the other end 2a of the locking piece 2 by the suction action of the plunger 4. comes into contact with. 5 is the size setting lever 1
This is a rotary lever that together with the record size setting mechanism constitutes a record size setting mechanism, and rotates around the tone arm shaft 6. This rotating lever 5 has a short hole 5a for a 30 cm record and a long hole 5b for a 17 cm record. 7 is a tone arm (not shown)
This is a tone arm feed lever for rotating the tone arm from the armrest position toward the record (lead-in) or from the record toward the armrest (lead out), and rotates around the tone arm shaft 6. The rotation lever 5 is rotated in response to the rotation of the tone arm feed lever 7, and the rotation range of the rotation lever 5 is restricted by the pin 1b of the size setting lever 1. Rotating lever 5
After the rotation of the tone arm is blocked by the pin 1b, the rotation of the tone arm due to the rotation of the tone arm feed lever 7 is stopped. That is, when the pin 1b is in contact with the one end 2b of the locking piece 2 and is located on the short hole 5a side, the tone arm is moved toward the tone arm feed lever 7.
to the lead-in groove of the 30cm record, and pin 1.
When b is in contact with the other end 2a of the locking piece 2 and located on the elongated hole 5b side, the tone arm feed lever 7
This allows the 17cm record introduction mechanism to be rotated. Tone arm feed lever 7 mentioned above
Regarding the rotation of the tone arm, various configurations are already known, and since this is not the gist of the present invention, a detailed description of the configuration will be omitted.

In this embodiment, the tone arm feed lever 7 is configured to be rotated by a dedicated motor _M2 for driving the tone arm. A gear portion 8c is formed on the circumferential surface of the rotary plate 8, and the rotation of the motor _M2 is transmitted to the rotary plate 8 via a gear 9 fitted to the rotating shaft of the motor _M2 . The rotary plate 8 and the tone arm feed lever 7 are connected by a communication member 10. That is, the communication member 10 is pivotally supported 11 by the rotary plate 8 and the tone arm feed lever 7, respectively.
A cam groove 8a is provided on the lower surface of the rotating plate 8, and a cam groove 8b is provided on the upper surface. Each switch is controlled by these cam grooves. That is, the switch operation piece 12 that engages with the cam groove 8a is rotatable about the shaft 13, and controls the performance holding switch _S1 . The switch operation piece 14, which also engages with the cam groove 8a, is rotatable about the shaft 15 and controls the stop holding switch _S2 and the plunger drive switch _S3 , which is the gist of the present invention.
Further, a switch operation piece 16 that engages with the cam groove 8b is rotatable about the shaft 13, and controls the mutating switch _S4 .

Now, FIG. 1 and FIG. 2 show the stopped state, the plunger 4 is not driven, and the 30cm record is selected. In the stopped state, the convex portion of the switch operating piece 12 is engaged with the cam groove 8a, and the switch _S1 is open.

Further, since the switch operation pieces 14 and 16 are both in contact with the outer peripheral surface of the cam, the switches S ₂ , S ₃ and S ₄ are closed. With the switch _S4 closed, the muting circuit 17 is in operation. Next, when the performance switch _S5 is closed to start playing, the turntable driving motor _M1 and the tone arm driving motor _M2 start rotating. motor
When the rotary plate 8 rotates due to the rotation of _M2 , the convex part of the switch operation piece 12 escapes from the cam groove 8a.
From now on, even if you take your finger off performance switch _S5 and open this switch _S5 , switch _S1 will not start the motor.
The rotation of M ₁ and M ₂ continues. In response to the clockwise rotation of the rotary plate 8, the lead-in operation of the tone arm is performed. FIG. 3 shows the state during lead-in operation.

Now, when the lead-in operation is completed and the rotary plate 8 rotates approximately half a rotation, the protrusion of the switch operation piece 14 engages with the cam groove 8a, and the protrusion of the switch operation piece 16 engages with the cam groove 8b, so that the switch S ₂ , S ₃ and S ₄ are each opened (see Figure 4). When switch S ₂ is opened, the drive circuit of motor M ₂ is opened, and when switch S ₄ is opened, muting circuit 1 is opened.
7 becomes inactive. This state is the record playing state. In such a record playing state, the switch _S3 is open, so even if the record size setting switch _S6 is closed, the plunger 4 is not driven in any way.

In response to the end of the record playing, or when the cutter switch _S7 is closed manually, the motor _M2 starts rotating again. When the rotary plate 8 rotates a little, the switch _S2 is closed, and even if the cut switch _S7 is subsequently opened, the motor _M2 continues to rotate, and the tone arm read-out operation is performed. When the rotary plate 8 rotates to the state shown in FIG. 1, everything returns to its initial state and comes to a halt.

According to the present invention described above, even if the record size setting switch is operated while a record is being played, the plunger for changing the record size will not be driven in any way, and therefore the record player itself will not be activated while the record is being played. There is no inconvenience of vibration.

[Brief explanation of drawings]

The drawings all show the device for preventing erroneous operation of a record player according to the present invention; FIG. 1 is a plan view in a stopped state, FIG. 2 is an electric circuit diagram, and FIG. 3 is a plan view during lead-in operation. FIG. 4 is a plan view during performance. 4 is a plunger, 8 and 14 are a rotary plate and a switch operation piece constituting a performance state detection mechanism, _S3 is a plunger drive switch, _M1 is a turntable drive motor, and _M2 is a tone arm drive motor.

Claims (1)

[Scope of Claim for Utility Model Registration] A record player configured to control the record size setting with a plunger, which includes a detection mechanism for detecting that the record player is in a playing state, and a detection mechanism that detects that the record player is in a playing state, and a detection mechanism that detects that the record player is in a playing state. a switch for opening a driving circuit of the plunger, and the plunger is prevented from being driven by opening the switch even if a record size setting operation is performed by mistake while the record player is playing. Misoperation prevention device.