JPH0237121Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention involves setting a record on a turntable, placing a playback stylus on the record, rotating the turntable, and following the sound groove of the rotating record. Regarding a record player that performs playback by moving the playback needle and gradually moving the tone arm inward, more specifically, in such a record player, there is a tone arm return structure that returns the tone arm to its initial position after playback ends. Regarding.

Prior Art Some conventional record players perform playback by moving the playback needle along the sound groove of a rotating record as in the present invention, and others move the playback needle along the sound groove of a stationary record. There are some that perform playback by rotating and moving.

However, with the former type of record player, the record is inserted into the record storage space from its plane direction, the record is automatically set on the turntable, and the playback needle is inserted into the sound groove. , the turntable is rotated, the playback needle is moved along the sound groove as the record rotates, and the tone arm is gradually rotated inward to perform playback automatically. Until now, there has never been a device with a structure in which the eject member is operated to eject the record.

Purpose This invention provides a tone arm return structure for the record player described above that automatically returns the tone arm to its initial position when the eject member is operated externally to remove a record. The purpose is to provide.

Configuration This invention will be explained in detail below according to an embodiment of this invention shown in the drawings.

FIG. 1 is an external perspective view of a record player according to this invention. The illustrated record player is formed by combining a front case 10 and a rear case 12. And on the top, there is a record insertion slot 1.
4 is opened, and an eject button 16 for taking out the record is installed in front of it. Further, a speaker grill 18 and a battery cover 20 are provided on the front side, and a volume adjustment knob 22 and an external power supply connection terminal 24 are provided on the left side surface.

FIG. 2 is an exploded perspective view of the record player shown in FIG. 1, with the front side facing up and the entire record player disassembled. As can be seen from FIG. 2, a plate-shaped table holder 26 is housed and fixed within the rear case 12. A drive motor 30 is attached to the table holder 26 via some anti-vibration rubber 28. The rotation of the drive motor 30 is transmitted to a pulley wheel 36 using a square belt 34 that is wrapped around the pulley 32, and further to a turntable 40 using a flat belt 38 that is wrapped around a rotating shaft 36a of the wheel 36. A fixed shaft 42 erected on the table holder 26 is inserted through the central cylindrical shaft portion 40a of the turntable 40, and the turntable 40 is supported rotatably about the fixed shaft 42. A circular recess 40b is formed in the center of the turntable 40, and a slide piece 44 is housed in the circular recess 40b. As shown in FIG. 4, the slide piece 44 has a mushroom shape, and a central cylindrical shaft portion 40a penetrates through the center of the slide piece 44, and is supported slidably along the shaft portion 40a. Therefore, a compression spring 46 is normally disposed between the circular recess 40b and the bottom surface to give an outward movement habit, and the head is moved to the turntable 40 as shown in FIG.
It is made to protrude slightly from the zero surface, and is pressed against the turntable 40 and stopped.

One side of the main chassis 48 faces such a turntable 40 at a constant distance, and as can be seen from FIG. 4, a record storage space 50 is formed therebetween. Main chassis 48
has a plate shape and is fixed to the rear case 12 with screws together with the table holder 26 described above. By the way, a detection lever 52 is rotatably attached to the other surface of the main chassis 48. As shown in FIG. 2, the detection lever 52 has an engagement portion 52a formed by folding back at the tail end, an engagement pin 52b standing in the middle, and a contact piece 52c at the tip.
The tip contact piece 52c is inserted into the record storage space 50 described above. Then, the engagement pin 52b is inserted into the engagement elongated hole 54a at one end of the drive lever 54. As shown in FIG.
is rotatably attached to the main chassis 48, and has a tension spring 56 hooked to the main chassis 48 at the other end, so that it always has a clockwise rotation behavior in FIG. Due to this rotational behavior, the tip contact piece 52c of the detection lever 52 is maintained in the record storage space 50, and the engagement portion 52a of the detection lever 52 is held in the tone arm 7 of the pick-up mechanism 76, which will be described later.
Apply it to the side of 6a.

The other end of the drive lever 54 is also formed with an engaging protrusion 54b. The engagement protrusion 54b is
As the drive lever 54 rotates, a switch 58 shown in FIG. 2 is opened and closed to turn the electric circuit on and off. In addition, the reference numeral 60 in FIG. 2 is a circuit board to which the volume adjustment knob 22 and the external power connection terminal 24 of FIG.
8 is attached to the chassis.

Now, the engaging protrusion 54b again enters into the L-shaped guide hole 64a of the eject lever 64.
The eject lever 64 has an L-shape, is attached to the main chassis 48, and is slidable while being guided by a plurality of guide pieces 48a of the main chassis 48. And, at all times, the tension spring 66
When the drive lever 54 is rotated, it becomes slidable.
Move to the position indicated by the dashed line in FIG. The eject lever 64 is formed with a crank-shaped protrusion 64b whose tip is bent upward, and its tip faces the inside of the eject button 16 described above. A locking projection 64c is erected next to the projection 64b, and one end of a tension spring 66 is hung on the locking projection 64c. The other end of the tension spring 66 is latched to a latching protrusion 48b erected on the main chassis 48.

At the tip of such an eject lever 64,
Further, a folded protrusion 64b is formed. The folded projection 64d abuts against the slope 68a of the presser lever 68, as shown in FIG. Presser foot lever 68
is attached at its base end to the main chassis 48 so as to be rotatable about a support shaft 70 parallel to the main chassis 48. Under normal conditions, the torsion spring 72 provides a rotational behavior toward the main chassis 48, and the slope 68a is turned back by the protrusion 64d.
be pressed against. When the eject lever 64 is in the position shown by the solid line in FIG.
4 is in the position shown by the dashed line in FIG. 3, the folded protrusion 64d slides down the slope 68a from the state shown in FIG. 4, moves downward, and comes into contact with the bottom position of the slope 68a. At this time, presser lever 68
The tip of the disk presses the head of the disk cap 74 by the force of the torsion spring 72. As can be seen from FIG. 4, the disk cap 74 is housed in the center hole 48c of the main chassis 48 and faces the slide piece 44 described above. The force of the torsion spring 72 is stronger than the force of the compression spring 46, and when the presser lever 68 pushes the disk cap 74, the disk cap 74 clamps the record between it and the slide piece 44, and the record is held. It has a structure that allows it to be reliably set on the turntable 40.

By the way, the presser lever 68 extends a support arm 68b from the side of the tip. The tip of the support arm 68b supports the tip of the tone arm 76a of the pickup mechanism 76. The pick-up mechanism 76 is constructed by attaching the base end of a tone arm 76a to the main chassis 48, so that the tip of the tone arm 76a can move both in a direction parallel to the surface of the main chassis 48 and in a direction perpendicular to the surface of the main chassis 48. A reproduction needle 78 is attached to the tip of the tone arm 76a. The reproduction needle 78 is adapted to move into contact with and separate from the record on the turntable 40 through the notch 48d of the main chassis 48 in conjunction with the movement of the presser lever 68.

On the other hand, a fixing pin 80 stands at the base end of the eject lever 64 described above. When the ejection lever 64 is pushed down, the fixing pin 80 engages with the claw portion 82a at one end of the timing lever 82, and causes the timing lever 82 to move against the torsion spring 84, as shown by the dashed line in FIG. Rotate. The timing lever 82 is rotatably attached to the main chassis 48, and is normally given the ability to rotate counterclockwise in FIG. It becomes. Then, when the timing lever 82 is rotated, the bent portion 82b is moved to the presser lever 68.
, and pushes up the presser lever 68 against the torsion spring 72.

In addition, as shown in Fig. 2, the front case 1
The speaker 86 is located inside the speaker grill 18 of 0.
will be provided. Further, a battery storage space 88 is formed within the battery lid 20, and four dry batteries 90...
is stored.

Next, the case of using the record player according to this invention will be explained.

First, with the side of the record you want to listen to facing toward you, insert the record into the record insertion slot 14 as shown in Figure 1, and press down lightly. Then, the record is guided by the turntable 40 and main chassis 48 shown in FIG.
4, and is inserted into the record storage space 50 from the plane direction thereof. At this time, the record 92 pushes down the tip contact piece 52c of the detection lever 52 located in the storage space 50, and rotates clockwise from the state shown in FIG. 3 to the state shown in FIG. 6. Insertion of the record disc 92 is detected by the rotation of the detection lever 52. This rotation of the detection lever 52 is transmitted to the drive lever 54, and the drive lever 54 is moved to the third position against the tension spring 56.
It is rotated counterclockwise in the figure to the state shown in FIG. 6 in the same manner. When the drive lever 54 rotates, its engagement protrusion 54b moves within the guide hole 64a. Then, the eject lever 64 is pulled by the tension spring 66 and moves upward while being guided by the guide pieces 48a. When the eject lever 64 moves upward, the crank-shaped protrusion 64b pushes up the eject button 16. On the other hand, the folded protrusion 64d of the eject lever 64
The presser lever 68 moves from a position where it contacts the top of the slope 68a of the presser lever 68 as shown in FIG. 7A to a position where it contacts the bottom as shown in FIG. 7B. Therefore, presser foot lever 6
8, the biasing force of the torsion spring 72 pushes the head of the disk cap 74. Then, the disk cap 74 pushes down the slide piece 44 and aligns the center hole of the record 92 with the center cylindrical shaft portion 40 of the turntable 40, as shown in FIG.
Fit into a. Then, the record disc 92 is sandwiched between the slide piece 44 and the record disc 92 is
securely set on the turntable 40.

By the way, the eject lever 64 is connected to the tension spring 6.
6, the engagement protrusion 54b is pushed by the edge of the guide hole 64a, and the drive lever 5
4 is further rotated, and the contact piece 5 of the detection lever 52
2c leaves the outer periphery of the record 92. and,
The engagement protrusion 54b of the drive lever 54 is connected to the switch 58.
is closed and the electric circuit is turned on to drive the drive motor 30.
is activated to rotate the turntable 40.
At the same time, the tone arm 76a, which had been lifted up by the support arm 68b of the presser lever 68, is lowered, and the playback needle 78 is placed in the sound groove of the record 92. Then, by rotating the record 92, the playback needle 78 is moved along the sound groove, and the tone arm 76a is gradually moved inward to sequentially perform playback.

After the playback is finished, press the eject button 16.
When the eject button 16 is pressed, the protrusion 64b is pushed and the eject lever 64 is pushed down.
When the eject lever 64 is pushed down, the fixing pin 80 of the eject lever 64 engages with the claw portion 82a at one end of the timing lever 82, and as shown in FIG.
From the state shown in FIG. 8B, the timing lever 82 is rotated against the torsion spring 84 as shown in FIG. 8B. Then, the other end bent portion 82b engages with the tip of the presser lever 68, and pushes the presser lever 68 upward against the torsion spring 72, as shown in FIG.
As a result, the reproduction needle 78 is separated from the record 92. When the eject lever 64 is further pushed down, the fixing pin 80 enters under the claw portion 82a and the timing lever 82 is returned to its original position by the force of the torsion spring 84, as shown in FIG. 8C. However, at this time, the folding protrusion 64d of the eject lever 64 has already been turned to the inclined surface 68a.
has moved from the bottom position to the top position, that is, has transitioned to the state shown in FIG.
It will continue to be separated from 2.

By the way, when the ejection lever 64 is pushed down sufficiently, the drive lever 54 becomes able to rotate clockwise in the drawing by the force of the tension spring 56, and after passing through the state shown in FIG. 8D, it rotates as shown in FIG. 8E. move. Then, the switch 58 is opened and the electric circuit is opened.
OFF, the operation of the drive motor 30 is stopped,
Rotation of the turntable 40 is stopped. At the same time, the detection lever 52 is rotated counterclockwise, causing the record 92 to be stored in the storage space 50.
will be sprung up by the biasing force of the tension spring 56. At this time, the engaging portion 5 of the detection lever 52
2a engages with the side surface of the tone arm 76a, and as the detection lever 52 rotates, the pick-up mechanism 76, which had been moved inward, is returned to its initial position on the outside, resulting in the state shown in FIG.

Next, when a new record is inserted again, the detection lever 52 similarly rotates, the rotation is transmitted to the drive lever 54, the engagement protrusion 54b moves into the guide hole 64a, and the ejection lever 64 is moved upward. However, at this time, the fixing pin 80 of the eject lever 64 is not connected to the timing lever 8.
Since the fixing pin 80 is located below the claw portion 82a of No. 2, the fixing pin 80 will be caught on the claw portion 82a if left as is. However, as shown in FIG. 5, the claw portion 82a is formed with a relief protrusion t, and when the eject lever 64 moves upward, the fixing pin 80
can fit under the relief protrusion t and pass under the claw portion 82a.

In addition, in the embodiment of this invention described above, the detection lever 52, which is an example of the detection member, is connected to the record disc 92.
The case where it rotates when pushed by is explained.
However, the detection member does not only rotate, but also slides in the insertion direction, thereby detecting the insertion of a record and preventing the detection member from moving with a pressing member (corresponding to the pressing lever 68 in the above embodiment). do)
The pressure may be transmitted directly or indirectly to the presser member, and the record may be held down and set on a turntable, for example, as shown in the above embodiment.

Effects Therefore, according to this invention, when the eject member of a record player is operated by an external operation to take out a record, the tone arm can be automatically returned to the initial position, so that the next When you set a new record, you don't have to worry about returning the tone arm to the starting position.
It is possible to simplify handling and improve operability. Further, since the tone arm can be returned to its original position using the eject mechanism, there is an advantage that the structure is simple without increasing the number of parts.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a record player equipped with a tone arm return structure according to this invention. FIG. 2 is an exploded perspective view of the record player shown in FIG. 1, with the front facing upward, and showing the record player as a whole. FIG. 3 is a front view of the internal mechanism of the record player shown in FIG. 1, before a record is set. FIG. 4 is a sectional view taken along the - line in FIG. 3. FIG. 5 is a timing lever used in the record player shown in FIG. 1, and is a partially enlarged perspective view of a claw portion at one end thereof.
FIG. 6 is a front view of the internal mechanism of the record player of FIG. 1, similar to FIG. 3, but this FIG. 6 shows the record player after it has been set. FIG. 7 is a central sectional view of the internal mechanism of the record player shown in FIG.
A shows before setting the record, B shows after setting. FIGS. 8A to 8E are explanatory diagrams showing the movement of each lever in stages when the eject button is pressed. FIG. 9 is a sectional view showing a state in which the bent portion of the timing lever engages with the presser lever. 50... Record storage space, 52... Detection lever shown as an example of a detection member, 52a... Engagement portion, 6
4... Eject lever shown as an example of an eject member, 76... Pick up mechanism, 76a... Tone arm, 78... Playback needle, 92... Record disc.

Claims (1)

[Scope of Claim for Utility Model Registration] A record storage space into which a record is inserted from the plane direction; When a record is inserted into the storage space, it is pushed by the record and moves in the insertion direction, a detection member that detects insertion of a record; a pick-up mechanism to which movement of the detection member is transmitted when the detection member detects insertion of a record to place a playback needle on the record; and an external operation after playback is completed. an eject member that pulls the playback stylus away from the record, returns the detection member to its original position, and flips up the record; The needle is moved along the sound groove to perform playback while gradually rotating the tone arm inward, and when the detection member returns to its original position, it engages with the tone arm and causes the tone arm to move. A tone arm return structure for a record player, wherein an engaging portion for returning the tone arm to an initial position is formed on the detection member.