JPS596543Y2 - Record player protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a protection device for a record player, and in particular to one that prevents a tone arm from leading in when there is no record on the turntable.

As is well known, record players are of the so-called mechanical fully automatic type, which uses the rotational force of a turntable to rotate multiple times to mechanically drive a lead-in mechanism, auto-return mechanism, etc. via a cam mechanism, etc. There is something.

Here, in the lead-in mechanism, the tone arm leaves the armrest and moves to the periphery of the record as the turntable rotates, and from that position it descends onto the record to perform automatic performance.

By the way, in the lead-in mechanism as described above, if you accidentally drive the lead-in mechanism without a record placed on the turntable, the record needle will fall onto the rubber sheet of the turntable. There was a problem in that the record stylus would be damaged.

Moreover, such problems tend to occur frequently especially in remote-controllable record players that have been developed recently.

Therefore, as a conventional measure to protect the record stylus in such cases, the presence or absence of a record on the turntable is detected, and if the detection signal indicates that there is no record, the tone arm moves from the armrest to the end of the turntable. It was designed to move horizontally to the inner circumference and return to the armrest again without descending at that position.

However, with the conventional record stylus protection mechanism as described above, it takes about 10 seconds for the tone arm to reciprocate when the record is not on the turntable.
It was extremely inconvenient to handle the product as one had to wait for that time.

In addition, in the Uhuru auto record player, the horizontal movement of the tone arm and the vertical movement of lowering it onto the record are performed using two independent motors. By controlling the motor, the above-mentioned protection mechanism can be easily realized with a simple structure, but in a fully automatic mechanical type record player, the tone arm cannot be directly controlled by the detection signal, so the structure becomes complicated and there are many failures. It was also economically disadvantageous.

This invention was made in consideration of the above circumstances, and it is an object of the present invention to provide an extremely good protection device for a record player that is convenient to handle, has a simple structure, can reliably protect the record stylus, and is suitable for remote control. With the goal.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

In FIG. 1, 11 is a turntable, and a rubber seat 12 is placed on the upper surface of the turntable in the figure.

This turntable 11 has a record detector 1 at a position that covers both so-called EP discs and LP discs with diameters of 17 (cm) and 30 (cm, l).
3 is inserted through the rubber seat 12 and protrudes.

Here, as shown in FIG. 2, the detector 13 has a so-called seesaw-like engagement on the lower surface of the turntable 11, with a substantially doglegged side surface and a central portion rotatably supported by the turntable 11. It is attached to one end of member 14.

As shown in FIG. 3, projecting first and second retaining parts 15 and 16 are provided at both ends of the engaging member 14 at different distances from the center of the turntable 11 in the radial direction. In the normal state, the first retaining portion 15 projects downward from the turntable 11 due to the biasing force of the spring 17.

Referring again to FIG. 2, when a record (not shown) is placed on the rubber seat 12, the detector 13 is pushed by the record against the biasing force of the spring 17.

Then, the retaining member 14 rotates clockwise in the figure, and the second retaining portion 16 projects below the turntable 11.

In other words, the first and second retaining parts 15. Reference numeral 16 selectively projects below the turntable 11 depending on whether a record is placed on the turntable 11 or not.

Here, when the turntable 11 is rotated with a record placed on the turntable 11, the third
As shown in the figure, the second retaining portion 16 rotates along a trajectory indicated by a two-dot chain line a in the figure, and engages with the substantially sword-shaped switching member 18 within one rotation of the turntable 11.

This switching member 18 is rotatably supported by a record player or a housing (not shown) at approximately the center thereof, and is stabilized at the positions shown by solid lines and dotted lines by a bistable spring 19 provided at the other end. It is.

Then, the switching member 1 engaged with the second retaining portion 16
8 is in the position shown by the solid line in the figure, and the arm lock lever 21, which has a ten-sided L-shape and is connected to the other end of the switching member 18 via the rod 20, is in the position shown by the solid line in the figure.

This arm lock lever 21 has one end connected to a rod 20, a hook portion 22 formed at the other end, and is rotatably supported at approximately the center thereof, and is normally supported by a spring 23. It is biased clockwise in the figure.

Here, when the arm lock lever 21 is in the position shown by the solid line in the figure, the hook portion 22 moves the lead-in plate 25 to move the tone arm 24 in the direction of the arrow in the figure in conjunction with the rotation of the turntable 11. The pin 26 is separated from the pin 26 implanted in one end of the pin 26.

Therefore, the lead-in plate 25 is connected to the turntable 1.
The tone arm 24 can be freely rotated in the direction of the arrow shown in the figure in conjunction with the rotation of the tone arm 24, and lead-in of the tone arm 24 is performed accordingly.

In addition, the pin 27 implanted at the other end of the lead-in plate 25 is connected to the size of the record (EP or LP).
The lead-in plate 25 comes into contact with the positioning surfaces 281 and 282 of the positioning member 28, which are regulated to two different positions depending on the size of the record, and the rotation of the lead-in plate 25 is stopped at two different positions depending on the size of the record. can be determined.

On the other hand, when the turntable 11 is rotated with no record placed on the turntable 11, the l-th engagement portion 15 of the engagement member 14 rotates along the trajectory indicated by the two-dot chain line b in the figure. , engages with the switching member 18, and places the switching member 1B in the position shown by the dotted line in the figure.

Then, since the arm lock lever 21 is not pulled through the rod 20, it is rotated by the biasing force of the spring 23 to the position indicated by the dotted line in the figure, and the hook portion 22 engages with the pin 26 of the lead-in plate 25.

Therefore, even if the turntable 11 rotates, the lead-in plate 25 is forcibly prevented from rotating in the direction of the arrow shown in the figure.

Therefore, the read-in operation of the tone arm 24 is not performed, and the record needle can be protected.

In addition, in Fig. 3, the medium diameter small-diameter dash-dot line C and the large-diameter dash-dot line d
show the periphery of the EP disc and the LP disc, respectively.

Therefore, according to the structure of the above embodiment, the presence or absence of a record can be easily detected by the detector 13, and the switching operation of the switching member 18 allows the lead-in plate 2 to be detected easily.
Since the operation of 5 is controlled, the overall structure is simple and the record stylus can be reliably protected.

In addition, the turntable 1 can be used with or without a vinyl record.
1 is always rotated when the rotary operator is operated, and when there is no record, the lead-in plate 25 connected to the tone arm 24 is forcibly prevented from rotating. Effective for use with operable record players.

In other words, in remote control, whether wired or wireless, a pulse signal is generated when operating the remote control unit, and the record player body receives the pulse signal and performs a predetermined operation. It is designed to be operated using signals.

For this reason, it is preferable to keep the turntable 11 rotating and prevent the lead-in plate 25 from rotating when the turntable rotation operator provided on the remote control operation unit is operated during remote operation. This is because it is advantageous in terms of mechanical structure and circuit structure.

FIGS. 4 and 5 show other embodiments of this invention, and the same parts as in FIG. 3 are given the same symbols, and only the different parts will be explained here.

That is, in FIG. 4, the engaging member 14 has an engaging portion 31 only at one end.

That is, depending on whether or not a record is placed on the rubber seat 12, the engaging portion 31 is controlled to two positions, upper and lower in the figure.

Now, when the turntable 11 is rotated with a record placed on the turntable 11, the retaining member 14 will also rotate as shown in FIG. Since the portion 31 is located at the upper side in FIG. 4, it does not engage with the switching member 18.

Here, as the turntable 11 rotates, the return lever 32 slides to the right in the figure by a well-known cam gear mechanism (not shown).

Then, the extension part 34, which extends from the corner of the arm lock lever 21 and is pressed by the action of the spring 23 to the retaining piece 33 formed on one side of the return lever 32, stops moving the return lever 32. As a result, the arm lock lever 21 rotates counterclockwise in the figure, and the hook portion 22 of the arm lock lever 21 attempts to engage with the pin 26 of the lead-in plate 25.

However, the spring 3 provided on the return lever 32
5, the set lever 36, which is normally set to the position shown by the solid line in the drawing, presses the reset spring 37 extending from the approximate center of the switching member 18, and rotates the switching member 1B clockwise in the drawing to the position shown by the dashed dot line in the drawing. Since the arm lock lever 21 is in the position shown in the figure, rotation of the arm lock lever 21 in the counterclockwise direction in the figure is prevented via the rod 20, and the pin 26 of the lead-in plate 25 is not engaged with the hook portion 22 of the arm lock lever 21.

Here, when the turntable 11 further rotates, the return lever 32 slides to the left in the figure by the force gear mechanism.

Then, the lead-in plate 25 is rotated in the direction of the arrow shown in the figure by the action of a lead-in lever 38, which will be described later, and in conjunction with this, the lead-in operation of the tone arm 24 is performed.

At this time, the reset spring 37 is pressed against the return lever 32.
Since the switching member 18 is pressed by the engagement piece 39 formed on the other side, the switching member 18 is returned to the position shown by the solid line in the figure.

Therefore, the arm lock lever 21 is not pushed by the rod 20, and its hook portion 22 attempts to engage with the pin 26 of the lead-in plate 25 due to the action of the spring 23.

However, the extension part 34 of the arm lock lever 21 is pushed by the engagement piece 33 of the return lever 32 and rotated clockwise in the figure, so that the hook part 22 and the pin 26 do not engage.

Therefore, the lead-in plate 27 can be stably rotated in the direction of the arrow shown in the figure, and the tone arm 24 can be brought into the node.

Here, the lead-in lever 38 will be explained.

That is, the lead-in lever 38 is connected to the bistable spring 4
0 can take two positions, the solid line and the dashed-dotted line.

When the return lever 32 moves to the right in the figure with the lead-in lever 38 in the position shown by the solid line, the tip of the lead-in lever 38 comes into contact with the curved guide part 41 and moves along the curved surface. It is then sequentially raised upright to the position shown by the dashed line in the figure.

In this state, when the return lever 32 moves to the left in the figure, the upright lead-in lever 38 comes into contact with the lead-in pin 42 of the lead-in plate 25, causing the lead-in plate 25 to rotate in the direction of the arrow in the figure.

After that, when the pin 27 of the lead-in plate 25 comes into contact with the positioning member 28, the lead-in plate 25 stops rotating, and the lead-in lever 38, which was in contact with the lead-in pin 42, moves the return lever 32 in the left direction. The position is again shown by the solid line in the figure.

In this way, the lead-in plate 25 is rotated.

Next, when there is no record on the turntable 11, when the turntable 11 rotates, the engaging member 14 also rotates and its engaging portion 31 is located at the lower side in FIG. engage with.

Therefore, when the return lever 32 is moved rightward in the drawing, the switching member 1B, which was in the position shown by the dashed line in the drawing, is switched again to the position shown by the solid line in the drawing.

Then, the arm lock lever 21 is pulled by the rod 20 and its hook portion 22 is engaged with the pin 26 of the lead inflation plate 25.

Therefore, even if the return lever 32 moves to the left in the figure, the lead-in plate 25 is not rotated in the direction of the arrow in the figure, and the lead-in operation of the tone arm 24 is forcibly blocked.

With this structure, in addition to the effects of the previous embodiment, the engaging portion 31 of the engaging member 14 engages with the switching member 18 only when no record is placed, so that the switching member 18 and Since the impact generated when the engaging portion 31 is engaged is not transmitted to the record via the detector 13, the record surface will not be damaged.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as described in detail above, according to this invention, it is possible to provide an extremely good protection device for a record player that is convenient to handle, has a simple structure, can reliably protect the record stylus, and is suitable for remote control. Can be done.

[Brief explanation of drawings]

FIG. 1 is an external view showing the turntable portion of an embodiment of the record player protection device according to this invention, and FIG.
The figure is a partially enlarged side sectional view of the same turntable, FIG. 3 is a schematic diagram showing the main parts of the same embodiment, and FIGS. 4 and 5 are respectively of other embodiments of the invention. FIG. 2 is a side cross-sectional view showing a partially enlarged turntable portion and a configuration diagram showing main parts. 11... Turntable, 12... Rubber seat, 13... Detector, 14...
Engagement member, 15... First engagement portion, 16...
...Second engaging portion, 17...Spring, 1
B...Switching member, 19...Bistable spring, 20...Rod, 21...Arm lock lever, 22...Hook part , 23・
... Spring, 24 ... Tone arm, 25 ... Lead-in plate, 26 ...
...Pin, 27...Pin, 28...Positioning member, 31...Engaging portion, 32...
・Return lever, 33...Engagement piece, 34...
...Extending portion, 35...Spring, 36.
...Set lever, 37...Reset spring, 38...Lead-in lever, 39...
...Engagement piece, 40...Bistable spring, 41
...Guide part, 42 ... Lead-in pin.

Claims (1)

[Scope of utility model registration request] a record record detector provided on the turntable and controlled to first and second positions depending on the presence or absence of a record on the turntable; a switching member that engages with the record disc detector and rotation of the turntable and is controlled to the lead-in blocking position; and a switching member that engages with the lead-in member of the tone arm in the lead-in blocking position, and 1. A protection device for a record player, comprising: an engagement member for forcibly blocking a lead-in operation of a tone arm.