JPS6134561Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an armrest device for a record player.

First, a conventional example will be explained with reference to FIG.

1A is a plan view of a record player using a conventional armrest device, FIG. 1B shows the conventional armrest device when the hook is closed, and FIG. 1C shows the case when the hook is open. In FIGS. 1a, b, and c, 1 is a cabinet, 2 is a turntable, 3 is a tone arm, 4 is a counterweight, and 5 is an armrest device. or,
6 is the hook, 7 is the armrest base, 8 is the hook 6
The armrest device 5 is composed of a shaft that rotatably supports the armrest device 5. Figure 1a,
In the conventional armrest devices shown in b and c, when the tone arm 3 is in the armrest position (on the armrest stand 7) in a non-playing state, the tone arm 3 placed on the armrest stand 7 is moved from the hook 6. It was rotated and held from the state shown in FIG. 1c to the state shown in FIG. 1b. However, in such a method, the user must open and close the hook 6 of the armrest device by hand each time the user performs the above-mentioned operation when moving the tone arm at the start of a performance and when holding the tone arm after the end of the performance. This is not only extremely inconvenient, but also has the drawback that the holding force of the armrest device 5 is weak and the tone arm 3 is easily dislodged from the armrest base 7.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an armrest device that eliminates the above-mentioned drawbacks and automatically holds and non-holds a tone arm.

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

Fig. 2 is a plan view showing a record player using the armrest device of the present invention, Fig. 3 is a case where the armrest rotating section is closed, a is a plan view, b is a side sectional view, and Fig. 4 is an armrest rotating section. is open, a is a plan view, and b is a side sectional view.
In FIGS. 3 and 4, 9 is an armrest fixing part fixed to the cabinet 1, 10 is an armrest rotating part rotatably attached to the armrest fixing part 9 by a shaft 11, and 12 and 13 are armrest rotating parts. Rest switches 14a and 14b are notches provided in the armrest fixing part 9 and the armrest rotating part 10, respectively, and 15 is a lower part of the armrest rotating part 10 [rotation of the armrest rotating part 10]. The first gear 16 is a rest motor for rotating the armrest rotating section 10, and the second gear 17 is a second gear that transmits the rotation of the rest motor 16 to the first gear 15. In the armrest device of the present invention having such a configuration, the armrest rotating portion 10 and the armrest fixing portion 9 have a hollow hemispherical shape, and are designed to cover the cartridge portion of the tone arm 3. Further, the armrest device has notches 14a and 14b provided on the upper side of the armrest rotating section 10 and the armrest fixing section 9 in FIG. Hold the tone arm 3. In this state, the armrest rotating section 10 is rotated by the rest motor 16.
The rotation is transmitted by the second gear 17 and the first gear 15.

Next, the operation will be explained with reference to FIGS. 5 and 6.

FIG. 5 is a diagram showing a drive circuit of the armrest device of the present invention, and FIG. 6 is an operation waveform diagram thereof.

In FIG. 5, SW ₁ is an arm switch, which is turned on (closed) by an optical or mechanical structure when the tone arm 3 is in the armrest position.
OM ₁ , OM ₂ , OM ₃ , and OM ₄ are monostable multivibrators that are composed of gates G ₁ to _{G 6} , resistors, and capacitors, and output an H level only during the metastable period. First, when the tone arm 3 is in the armrest position and the armrest device is in the _state shown in _FIG. Outputs H level. This H level output is input to AND gate _G9 .
At this time, tone arm 3 is in the armrest position and arm switch SW ₁ is closed, so
AND gate _G9 outputs H level. This AND
When the H level output of the gate _G9 is input to the CP terminal of the first flip-flop FF-1, the H level is output from the Q terminal of the first flip-flop FF-1, and the transistor _Tr3 becomes conductive. Also, this H
The OR gate _G11 outputs an H level from the level output, and the transistor _Tr5 becomes conductive. At this time, the rest motor drive current is +B - transistor Tr ₂ - rest motor 16 - transistor Tr ₃ - transistor
It flows through the path of Tr ₅ , and the rest motor 16 is driven (FIG. 6c). Next, when the armrest rotating portion 10 rotates from the state shown in FIG. 3a, the rest switch 13 is turned on after a short period of time (FIG. 6f). When the rest switch 13 is turned on, the fourth monostable multivibrator is activated via the inverter IV ₂ .
Since the L level is input to OM ₄ , its output remains at the L level. Armrest rotating part 1
0 rotates further and reaches the state shown in Figure 4a,
The rest switch 12 is turned on, the third monostable multivibrator _OM3 outputs an H level, and this H level output is sent to the first flip-flop FF-1.
input to the CL terminal of the first flip-flop FF−
The output from the Q terminal of No. 1 is set to L level, making the transistor Tr ₃ non-conducting, stopping the rest motor 16 (FIG. 6c), and turning off the third flip-flop.
An H level is inputted to the CP terminal of FF-3, and an H level is outputted from the Q terminal of the third flip-flop FF-3 to turn on the transistor _Tr3 . Also, at this time, the H level output from the Q terminal of the third flip-flop FF-3 is input to the OR gate _G12 , so the transistor _Tr10 becomes conductive, and the drive current of the arm feed motor 19 is +B-transistor _Tr7- . Arm feed motor 19 - transistor Tr ₈ - transistor
It flows along the path of Tr ₁₀ and drives the arm feed motor 19, thereby starting horizontal rotation (in the lead-in direction) of the tone arm (FIG. 6d). When the lead-in operation of the tone arm 3 progresses and reaches a predetermined lead-in position, it is detected optically or mechanically and the detection signal is sent to the third flip-flop FF-.
input to the CL terminal of 3rd flip-flop FF
-3's Q terminal is set to L level, transistor _Tr8 is made non-conductive, and arm feed motor 19
(Fig. 6 d, g).

Next, the lead-out time will be explained in detail.

When the end of the performance is detected optically or mechanically and the start/stop switch SW ₂ is closed, or when the start/stop button is manually operated during the performance and the start/stop switch SW ₂ is closed, the second monostable multivibrator is activated. The H level is output from _OM2 , and the H level is input to the CP terminal of the fourth flip-flop FF-4. Therefore, the fourth
When the H level is output from the Q terminal of the flip-flop FF-4 and the H level is output from the OR gate _G12 , the transistors _Tr9 and _Tr10 are activated, and the drive current of the arm feed motor 19 is changed to the +B-transistor.
Tr ₆ - Arm feed motor 19 - Transistor Tr ₉
- The current flows in the path of the transistor Tr ₁₀ , and the arm feed motor 19 rotates in the opposite direction to that during lead-in (Fig. 6b, d). When the tone arm 3 rotates in the lead-out direction and returns to the armrest position, the arm switch SW ₁ is closed and the output of the first monostable multivibrator OM ₁ becomes H level. This H level is the CL of the fourth flip-flop FF-4.
The Q terminal output of the fourth flip-flop FF-4 input to the terminal is set to L level, the output of OR gate _G12 is set to L level, transistors _Tr9 and _Tr10 are rendered non-conductive, and the arm feed motor 19 is stopped. The H level of the first monostable multivibrator _CM1 is input to the CP terminal of the second flip-flop FF-2, and the H level is output from the Q terminal of the second flip-flop FF-2. This H level output
The signal is input to OR gate G ₁₁ , and transistor Tr ₅ is conductive due to the H level output of OR gate G ₁₁ , and transistor Tr ₄ is also conductive, so the rest motor
Since Tr ₅ is conductive and transistor Tr ₄ is also conductive, the drive current of the rest motor 16 is +B - transistor Tr ₁ - rest motor 16 - transistor
The current flows through the path Tr ₄ -transistor Tr ₅ , and the rest motor 16 rotates in the opposite direction to the rotation of the armrest rotating section 10 described above. Note that when the armrest rotating section 10 starts rotating, the rest switch 12 is opened, but the third monostable multivibrator _OM3 is not triggered thereby, and its output remains at the L level. The armrest rotating part 10 completes rotation, and the notches 14a, 14b
When the tone arm 3 is held at the position, the rest switch 13 is opened. When the rest switch 13 is opened, the output of the fourth monostable multivibrator _OM4 becomes H level, this H level is input to the CL terminal of the second flip-flop FF-2, and the Q terminal of the second flip-flop FF-2 is inputted to the CL terminal of the second flip-flop FF-2. The output is inverted to L level. Therefore, the transistors Tr ₄ and Tr ₅ become non-conductive, and the rest motor 16
stops.

Note that the metastable period of the second monostable multivibrator _OM2 must be set to be shorter than the time required for the tone arm to return from the performance position to the armrest position. This is because when the tone arm returns to the armrest position and the arm switch SW ₁ is turned on, if the output of the second monostable multivibrator OM ₂ is still at H level, the output of the first flip-flop FF-1 is This is because the Q output becomes H level and the transistor Tr ₃ also becomes conductive. The connection between the D terminal and the flip-flop terminal is such that when an H level is input to the CP terminal, an H level is output from the Q terminal. In this embodiment, only a hollow hemisphere shape is described as the armrest shape, but the same effect can be applied to a rotatable, for example, hollow cylindrical shape.

As detailed above, according to the present invention, the tone arm can be held and not held automatically, which not only eliminates the inconvenience that conventionally occurred, but also makes it possible to securely hold the tone arm. Since the cartridge part is covered by the armrest fixing part and the armrest rotating part, the needle tip can be protected and dust can be prevented from adhering to the cartridge part.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a record player using a conventional armrest device, Fig. 2 is a diagram showing a record player using the armrest device of the present invention, and Fig. 3 is a diagram showing the armrest device of the present invention when it is closed. , FIG. 4 is a diagram showing when the armrest device is open, FIG. 5 is a diagram showing the drive circuit, and FIG. 6 is an operation waveform diagram thereof. 9...Armrest fixing part, 10...Armrest rotating part, 14a, 14b...Notch part, 15...
...First gear, 16...Rest motor, 17...Second gear.

Claims (1)

[Claims for Utility Model Registration] (1) An armrest fixing portion fixed to a cabinet, an armrest support rotatably attached to the armrest fixing portion, and an armrest support provided on the armrest fixing portion and the armrest rotating portion. the cartridge part of the tone arm is covered by the armrest fixing part and the armrest rotating part when the tone arm is stopped at the armrest position;
The armrest device is characterized in that the tone arm is held by the notch, and when the tone arm is driven, the armrest rotation part is rotated and the holding is released by the notch. (2) Utility model registration claim 1, which is characterized in that a motor and a gear that transmits the rotation of the motor are used as a driving means for the armrest rotation part.
Armrest device as described in section. (3) The armrest device according to claim 1, wherein the armrest rotating part and the armrest fixing part are hollow hemispherical.