JPS5813493Y2 - Cueing member evacuation device in record player - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a retracting device for a cueing member in a record player.

After a record has been played, the tone arm positioned above the final silent groove of the record is raised via an elevation arm prior to its return operation, and then the tone arm is returned to the arm rest. A cueing member of a cueing device that contacts a sensing member that rotates together with the tone arm during lead-in of the operating member and the tone arm and clicks and stops the tone arm on the outer circumferential silent introduction groove of a record of various sizes. In conventional record players equipped with When the cueing member is moved to the final silent groove in step 1, the cueing member is provided with unevenness to stop the tone arm from clicking, so the return operation of the auto-returning tone arm is not smooth, and the corresponding There was a high risk of the tone arm climbing over the armrest and damaging the tone arm or record stylus.

In reality, such malfunctions do not occur very often, but since the above-mentioned danger is extremely high, it was desirable to solve this problem.

The purpose of this invention is to ensure that the cueing member and sensing member are reliably connected each time even if the tonearm auto-returns by mistake when the sensing member that rotates together with the tonearm is in contact with the cueing member. It is an object of the present invention to provide a retracting device for a cueing member that can release the contact state and perform a normal auto-return operation.

One embodiment of this invention will be described in detail below based on the drawings. 1 is a tone arm, 2 is a tone 7-, an A-axis, 3 is a tone arm;
4 is an actuating plate attached to the tone arm shaft 2; 4 is a switch control piece 4 having one end pivotally connected to the actuating plate 3;
5 is a small gear attached to the turntable shaft 6, and 7 is this small gear 5.
This large gear 7 is provided with a notch 7a on its outer peripheral edge, and has a link pawl 7b on its upper surface that is rotated by the operating protrusion 4b of the slide lever 4.

7c is pivotally mounted, and a heart-shaped cam groove 7d is provided on the lower surface of the cam groove 7d.The pinion 5 is allowed to escape into the notch 7a, and the actuating member 8, which is pivotally supported so as to be movable in the longitudinal direction, is placed in the cam groove 7d. One end is fitted.

The actuating member 8 is biased in one direction by a tension coil spring 8c, and has an elevation arm 9 in contact with the upper surface of the bent portion 8a on the negative side, which raises the tone arm 1, and the actuating plate 3 A protrusion 3a is provided on the actuating member 8 and comes into contact with the protrusion 8b.

Reference numeral 10 denotes a d-sensitive material that rotates together with the tone arm 1, and a sensing pin 11 is protruded from the tip of the d-sensitive material.
On the outside of the rotation locus, there is a recess 12a on the sensing pin 11 side.
A cueing member 12 provided with j12b and j12c is pivoted while being urged to rotate in one direction by a torsion coil spring 13.

Similarly, the inclined protrusion 1 is urged to rotate in one direction by the torsion coil spring 14 and comes into contact with a rotation stopper 9a attached to the elevation arm 9 at its tip.
5a and is rotatably supported on a shaft is an elevating member 15 that raises and lowers the tone arm 1 arbitrarily. , cam walls 18 and 19 provided in the axial direction of the cam body 17 which is rotatably supported on the operating lever 16;
is in contact with.

In particular, as shown in FIG. 6, a crane-beak-shaped retracting member 20 is pivotably mounted between the actuating member 8 and the cueing member 12, and this retracting member 20 can be twisted. The coil spring 21 is biased to rotate in one direction, and the passive portion 20a is brought into contact with the upper surface of the actuating member 8 near the bent portion 8a, and the actuating portion 20b is provided as an inclined protrusion protruding from the cueing member 12. It is polymerized on the lower blade of piece 12 d.

Therefore, when the operating lever 16 is tilted forward as shown in FIGS. 1 and 5, the elevating member 15
The end of the cam wall 18 is in contact with the lower side down the slope 18a, and the end of the cueing member 12 is in contact with the higher force going up the slope 19a of the cam wall 19, so that the detent member 9a is The tone arm 1 is supported on the armrest 22 at a lower position of the inclined protrusion 15a, and although the cueing member 12 is distant from the sensing pin 11, it starts playing the record as shown in FIG. When the operating lever 16 is raised to the neutral state, the end of the elevating member 15 ascends the slope 18a of the cam wall 18, moves higher, and moves clockwise against the bias of the torsion coil spring 14. Since it rotates, the detent member 9a is rotated by the inclined projection piece 15.
a to raise the elevation arm 9, and the support member 9b attached to the upper end of the elevation arm 9 slightly lifts and supports the tip of the tone arm 1.

At the same time, the end of the cueing member 12 moves down the slope 19a of the cam wall 19 to a lower force, so that it rotates counterclockwise and comes into contact with the sensing pin 11.

Therefore, when the tone arm 1 is moved toward the record side in this state, the sensing pins 11, which rotate together, fall one after another into the recesses 12a, 12bj12c of the cueing member 12, and encounter some low pegs. When the tone arm 1 is stopped at that position, the record stylus will be located exactly on the outer circumferential silent introduction groove of records of various sizes with diameters of 30 crrL, 25 crrL, and 17 crIL.

At this time, before the tone arm 1 reaches the outer silence introduction groove of the record with the largest diameter of 30 crIL, the slide lever 4 pivoted to the actuating plate 3 that rotates together with the tone arm 1 moves to the right. Since the switch control piece 4a moves away from the microswitch 24 of the drive motor 23 and turns it on, the turntable shaft 5 is rotating.

Therefore, if the operating lever 16 is pushed forward again at this point, the rotating cam body 17 causes the end of the lifting member 15 to move lower down the slope 18a of the cam wall 18, counterclockwise. As a result, the detent member 9a moves to the lower side of the inclined protrusion 15a, lowers the elevation arm 9, and gently lowers the tone arm 1 onto the outer silence introduction groove of the record.
At the same time, the end of the cueing member 12 moves up the slope of the cam wall 19 and rotates clockwise, moving away from the sensing pin 11, so that the record is played normally and no problem occurs. , operation lever 16
Detection pin 11 and cueing member 12 without tilting the
With one housing in contact with the other, the tone arm 1 was mistakenly moved toward the center of the record as shown in Figure 3, but at this point the turntable shaft 6 had already rotated. Therefore, the auto return operation is exactly the same as when the record play ends, that is, the slide lever 4 moves to the right.
The operating protrusion 4b is the link pawl 7b.

7c and rotate it counterclockwise'': 8, the locking protrusion 7b' and the retaining protrusion 5a provided on the small gear 5 are engaged, and the large gear 7 is thereby rotated slightly. When the small gear 5 is pulled out from the notch 7a and the two mesh with each other, the operating member 8 whose tip is fitted into the cam groove 1d of the rotating large gear 7 is moved to the right as shown in FIG. A return operation is performed to cause the process to proceed.

Then, in the case of the conventional 11, since the sensing pin 11 that rotates together with the returning tone arm 1 is in contact with the cueing member 12, the sensing pin 11 is in the recessed part 1.
2a12b, 12cK fall-h The return operation of the tone arm becomes a zigzag return.

Then, since the tip of the tone arm 1 is configured to rest extremely lightly on the record due to the balance weight attached to one side beyond the pivot point, the force of the zigzag return causes the armrest 22 to move. There was a high risk of damaging the tone arm or damaging the record stylus if the actuating member 8 was to be climbed over, as shown in FIG. When lifting the elevation arm 9 with the bend g8a, simultaneously push up the passive part 20a of the retraction member 20, shake your head and push the inclined protrusion 12d of the cueing member 12 with the operating part 20b, Part 1
2 is twisted and rotated clockwise against the bias of the coil spring 13, so that the contact state with the sensing pin 11 is released, and the actuating plate 3 is moved by the protruding piece 8b of the actuating member 8 that follows the deflection. Due to the pressing action on the protrusion 3a, the sensing pin 11 that rotates back does not come into contact with the cueing member 12 at all.

The tone arm 1 moves the tone arm shaft 2 with the actuating plate 3 attached each time and reaches above the arm rest 22, and only then does the actuating member 80 return to the left and the retracting member 20, which is released from the upward movement of the bent portion 8a, By shaking the head and releasing the restraining action on the cueing member 12, the cueing member 12 is brought into contact with the sensing pin 11 again.

Note that the auto-return operation in the case of the above-mentioned erroneous operation is performed with the elevating member 15 raising the detent member 9a. The lifting and lowering motion ends in empty motion.

Further, when a normal auto-return operation is performed, the cueing member 12 is in a non-contact state with the sensing pin 11, so the retracting member 20 also performs an idle motion.

Then, when the tone arm 1 returns to the armrest 22, the switch control piece 4a of the slide lever 4, which has moved to the right,
Since the microswitch 24 is turned off, in order to play the record, the tone arm 1 can be moved to the record side again as described above.

As explained in detail above, this invention consists of a sensing member that rotates together with the tone arm, and a cueing member that comes into contact with the sensing member to click and stop the tone arm on the outer silence introduction groove of records of various sizes. Even if the auto-return operation is performed due to an erroneous operation while they are in contact, the contact between the cueing member and the sensing member can be released at that time, so abnormal return operation of the tone arm can be avoided. This has the effect of preventing damage to the record stylus.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the internal mechanism of the record player that implemented this invention, Figure 2 is a plan view of the same part as seen with the operating lever raised, and Figure 3 is the movement of the tone arm to the center of the record. FIG. 4 is a plan view during auto-return operation, FIG. 5 is a left sectional view of FIG. 2, and FIG. 6 is a partial front view of the evacuation device. 1... Tone arm, 4... Slide lever, 8... Operating member, 9... Elevation arm, 10... Sensing member , 12・
... Cueing member, 15 ... Lifting member, 16 ... Operation lever, 17 ... Cam body, 20 ... Retraction member.

Claims (1)

[Scope of utility model registration request] An operating member of an auto-return device that raises the tone arm via an elevation arm prior to its return operation during auto-return of the tone arm and a sensing member that rotates together with the tone arm during lead-in of the tone arm. and a cueing member of a cueing device that clicks and stops the tone arm on the outer circumferential silent introduction groove of record discs of various sizes. The cueing member, which is in contact with the sensing member, is suppressed and retracted before the tone arm returns by swinging its head with the actuating member that is pivotably mounted and moves the retracting member. A retraction device for the cueing member, characterized in that: