JPS6230163Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone arm drive device in a record player that applies a brake when the tone arm rotates horizontally.

In conventional tone arm drive devices, the tone arm vibrates when performing automatic operation,
Also, due to the inertial force caused by the motor during lead-in,
There was a possibility that the lead-in position would be shifted from the predetermined lead-in position. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tone arm drive device that prevents vibration of the tone arm during auto lead-in/auto return operations and positional shift of the lead-in position due to inertia of the motor during lead-in operations. It is.

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1, 2, and 3, 1 is a tone arm, 2 is an arm lifter, and 3 is a cabinet. A tone arm driving motor 5 is mounted on a motor bracket 6 on a mechanism chassis 4 in the cabinet 3. It is attached via. The rotation of the tone arm drive motor 5 is transmitted from the tone arm drive motor 5 to an intermediate gear 11 via pulleys 7 and 8, a worm 9, and a reduction gear 10. A shaft 12 to which the intermediate gear 11 is pivoted is fixed on the mechanism chassis 4 and also serves as a pivot shaft for the pivot lever 13. Swing lever 1
3, shafts 14 and 17 are fixed to the left and right sides of the shaft 12. The left shaft 17 in the figure is connected to the upper and lower sides of the mechanism chassis 4 via bearings 16, and a second
An idler 19 is pivotally attached to the lower side of the transmission gear 18. Further, a first transmission gear 15 is pivotally connected to the right shaft 14 and meshes with a cam gear 23 to which a cam plate for raising and lowering the tone arm is attached. Further, a shaft 20 is fixed to the swing lever 13, and one ends of a first spring 21 and a second spring 22 are applied thereto. The other end of the first spring 21 is hung on a spring receiver 6a provided on the motor bracket 6. This first spring 21 normally causes the first transmission gear 15 on the swing lever 13 to
and a cam gear 23 to which a cam plate for raising and lowering the tone arm is attached mesh with each other. (i.e.,
The swing lever is set to the first position). or,
The other end of the second spring 22 is hung on a shaft 26 fixed to a lever 25 that is interlocked with a plunger 24 . Plunger interlocking lever 25 has hole 25
a is provided, through which the shaft 20 passes, and the shaft 20 is normally crimped to the lower side of the hole in the figure by a second spring 22. However, when the plunger 24 is excited and the lever 25 is interlocked, the shaft 20 separates from the wall surface of the hole 25a, as shown in FIG.
Plunger 2 via the biasing force of spring 22
4 pulls the swing lever 13, and the swing lever 13 swings counterclockwise about the shaft 12 against the first spring 21. (That is, the swing lever is set to the second position). This results in the second
The idler 19 that rotates together with the transmission gear 18 is
It is pressed against an idler 28 attached to the horizontal rotation shaft 27 of the tone arm. Further, in order to prevent noise generated from the instantaneous operation of the plunger 24, a lever 30 of a silicone damper 29 into which a viscous fluid such as silicone oil is inserted is hung on the shaft 26. In FIG. 2, E-rings (not shown) are fitted at 31 and 32 to prevent the swing lever 13 fixed on the mechanism chassis 4 from floating above the mechanism chassis. Further, the shaft 31 is connected to the wall surface 13a of the hole of the swing lever 13.
By coming into contact with the first transmission gear 15 and the cam gear 23, biting is prevented when the first transmission gear 15 and the cam gear 23 mesh with each other. As shown in FIG. 4, a cam 23b for raising and lowering the tone arm is provided on the cam plate for raising and lowering the tone arm. 34 sliding portions 34a slide. or,
As the sliding portion 34a of the brake lever 34 slides, a lift increase detection switch 35 (see FIG. 2) is operated. A sliding portion 34a of the brake lever 34 is pressed against the side cam 23a by a spring 36. In Figure 2, the tone arm lifting cam plate rotates clockwise and the arm lift lifting cam 2 is rotated clockwise.
3b raises the tone arm 1, and the brake lever 34 rotates counterclockwise, and the end portion different from the sliding portion 34a is pressed against the idler 28 attached to the horizontal rotation shaft 27 of the tone arm. By pressing the brake lever 34, the tone arm horizontally rotates under load.

As shown in FIG. 5, the idler 28 pivotally mounted on the horizontal rotation shaft 27 has a shielding plate 37 provided with slits 42a, 42b, 42c corresponding to each record size and a slit 43 corresponding to the end of the record. and lever 3 with a permanent magnet fixed to the tip.
9 is attached. Also, each lever 37, 3
9, a lever with eccentric pins 40 and 41 is attached. In order to detect the position of the tone arm during lead-in and lead-out for each record size, light detection is performed by combining a generating element and a light receiving element fixed on the mechanism chassis so as to face each other with a shielding plate 37 in between. Vessel 44,
There are 45. A reed switch 46 is fixed on the mechanism chassis 4 and is activated by a permanent magnet 38 only when the tone arm 1 is in the armrest position.

The present invention is constructed as described above, and operations during auto lead-in and auto lead-out will be described below. First, during auto lead-in, the tone arm 1 is placed on the armrest (not shown) as shown in Fig. 2, so when the start button 47 in Fig. 8 is pressed, the mono multivibrator starts. The input of flip-flop 56 goes low and a high pulse is generated at its output, resetting flip-flop 50 and causing its output to go low. Therefore, AND gate 58 is turned off and transistor _Q4 is also turned off. On the other hand, when the start button 47 is turned on, the inverter 57
The output of the AND gate 60 becomes a high level, and the input side of the AND gate 60 becomes a high level, and the input sides from the flip-flop 50 and the inverter 59 become a high level.
0 is turned on and transistor _Q3 is also turned on.
Therefore, transistor _Q1 is turned on and the tone arm drive motor 5 rotates in the forward direction (in the direction of the solid line arrow in the figure).
do. When the tone arm drive motor 5 rotates, the cam gear 23 is rotated by a predetermined angle by the first transmission gear 15 on the swing lever 13, and the arm lifter 2 is raised by the elevating cam 23b, and the mutating and tone arm lowering detection switch 33 is turned on and muting is performed.
When the raising of the tone arm is completed, the tone arm raising detection switch 35 is turned on (see FIG. 7). When the tone arm rise detection switch 35 is turned on, the AND gate 48 is turned on together with the reed switch 46, which is turned on when the tone arm 1 is in the armrest position, and the high level is set as a flip-flop by the differentiating circuit 49. 50, and a high level signal is output from this flip-flop 50.
One of the inputs of the AND gate 60 becomes low level and turns off. However, the AND gate 58 is turned on, the transistor Q ₄ is turned on, and therefore the transistor Q ₂ is also turned on, and the tone arm drive motor 5 rotates in the opposite direction (in the direction of the broken line arrow in the figure). At this time, as shown in FIG. 9, when the tone arm rise detection switch 35 is turned on, a high level signal is input to the differentiating circuit 51, a high level signal is also input to the flip-flop 52, and its output becomes high level and the plunger is turned on. 24 is in an excited state. When the plunger 24 is energized, the swing lever 13 swings to the second position, and the cam gear 23 and the first transmission gear 1
5 is disengaged, and the horizontal rotation axis 27 of the tone arm
The swing lever 1 is connected to the idler 28 attached to the
An idler 19 pivotally attached to the left shaft 17 of the tone arm 3 is pressed and drives the tone arm horizontally. At this time, as shown in FIG. 7, the brake lever 34 is pressed against the idler 28 to prevent the lead-in position from shifting due to vibration or inertia of the idler 28.
When the tone arm 1 is horizontally driven to the lead-in position for each record size, the photodetector 4
4 is activated and generates a signal. That is, the AND gate 55 is turned on and the OR gate 54 is turned on.
Since flip-flop 52 is reset, plunger 24 is de-energized. Then, the swing lever 13 swings back to the first position by the first spring 21, and the first transmission gear 15 on the swing lever 13 meshes with the cam gear 23. but,
At this time, since the motor 5 is rotating in the reverse direction, the cam gear 23 rotates in the reverse direction and the tone arm 1 is lowered. When the lowering is completed, the tone arm lowering detection switch 3
3 is turned off, the muting is turned off, and the tone arm drive motor 5 is also turned off, thus ending the auto lead-in operation.

Next, during auto-return, when the tone arm 1 horizontally rotates to the end of the record, the photodetector 45 detects the record end detection slit 43 and generates a signal. As shown in FIG. 8, when the photodetector 45 is turned on, the output side of the mono-multivibrator 56 becomes high level, the flip-flop 50 is reset, and its output becomes low level. On the other hand, since the output from inverter 57 becomes high level and the output from inverter 59 also becomes high level, AND gate 60 is turned on, and transistors Q ₃ and Q ₁ are turned on. That is, the tone arm drive motor 5
is rotated forward. Tone arm drive motor 5
rotates, the first transmission gear 1 rotates in the same manner as described above.
5, the cam gear 23 rotates by a predetermined angle to raise the tone arm via the arm lifter 2. When the tone arm rise detection switch 35 is turned on and the rise is completed, the differentiation circuit 5 is turned on as shown in FIG.
A high level is input to 1, and flip-flop 5
A high level signal is input to 2. Therefore, plunger 24 is energized. When the plunger 24 is energized, the swing lever 13 swings to the second position, and the idler 19 of the second transmission gear 18 is moved to the idler 2 mounted on the horizontal rotation shaft 27 of the tone arm.
8 and drive the tone arm 1 horizontally.

However, since the tone arm drive motor 5 is rotating in the opposite direction to that during lead-in, the tone arm 1 horizontally rotates toward the armrest.
When the tone arm 1 reaches the tone arm rest position, the reed switch 46 is turned on and the AND gate 48 is turned on. When the AND gate 48 is turned on, the tone arm drive motor 5 rotates in the opposite direction in the same manner as described above, and as shown in FIG. It becomes de-energized. Then, the swing lever 13 is returned to swing by the first spring 21, the first gear 15 on the swing lever 13 meshes with the cam gear 23, and the rotation of the cam gear 23 lowers the tone arm. When the lowering is completed, the tone arm lowering detection switch 33 is turned off, and the tone arm driving motor 5 is turned off.
will stop and the auto return operation will end. Also, if you want to perform a return operation during a performance, as is clear from FIG.
3. Since the record end photodetector 45 is connected in parallel, the operations of the tone arm drive motor 5 and plunger 24 are the same as during auto-return. In addition, in order to prevent the lead-in position detection photodetector 44 from reacting during auto-return/readout, the lead-in position photodetector 44 reacts only when the tone arm drive motor 5 is in reverse rotation. Taking advantage of this fact, the voltage when the tone arm drive motor 5 rotates in reverse is divided, appropriately reduced, and connected as shown in FIGS. 8 and 9. Further, a photodetector 44 for the lead-in position is connected to the input side of the AND gate 55.

Since the present invention is configured as described above,
The tone arm can be driven vertically and horizontally using the rotational force of one motor, and the swinging lever is swung by the appropriately excited plunger, which transmits the rotation to the cam gear for vertical drive and horizontally drives the tone arm. Since rotation transmission to the drive idler can be selected, the configuration can be simplified and reliable operation can be performed.

According to the present invention, it is possible to automatically press the brake lever against the idler for horizontally driving the tone arm, thereby suppressing the horizontal vibration of the tone arm and the inertial force of the motor during auto lead-in operation. Misalignment of the lead-in position can be easily prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view of the tone arm drive device of the present invention, FIG. 2 is a back plan view thereof, FIG. 3 is a side view of the main parts, and FIG. 4 is a perspective view showing the relationship among the lift cam, brake lever, and arm lift. FIG. 5 is a plan view of the back of the tone arm position detection mechanism, FIGS. 6 and 7 are plan views of the back in different states, and FIGS. 8 and 9 show the switch relationship of the motor and plunger used in the tone arm drive device, respectively. 1 is a simple circuit diagram shown in FIG. DESCRIPTION OF SYMBOLS 1... Tone arm, 5... Tone arm drive motor, 11... Intermediate gear, 13... Swinging lever, 23... Cam gear having a cam 23b for raising and lowering the tone arm, 24... Plunger, 28...
Idler, 33...Lift lowering detection switch, 3
4...Brake lever, 35...Lift rise detection switch, 37...Detection slits 42a, 42
b, 42c, shielding plate provided with 43, 39... arm lever, 44... photodetector, 45... photodetector, 46... reed switch.

Claims (1)

[Claims for Utility Model Registration] (a) A motor for driving a tone arm, and (b) An intermediate gear to which rotational force from the motor is transmitted, which is rotatably provided on a swinging shaft and constantly meshed with the intermediate gear. (c) a cam gear having a cam for raising and lowering a tone arm; (d) a swing lever that swings and biases the swing lever in one direction; , a spring that sets the first transmission gear to a first position meshing with the cam gear; (e) an idler attached to a horizontal rotation shaft of the tone arm; and (f) a tone arm that is raised by rotation of the cam gear. (g) a plunger that is energized when the rotation of the second transmission gear is energized to swing the swing lever against a spring and set the swing lever to a second position where the rotation of the second transmission gear is transmitted to the idler; a brake lever that presses against the peripheral surface of the idler when the transmission is transmitted to the idler; (h) after the motor rotates the cam gear to raise the tone arm, the brung gear is energized and the oscillator is energized; A tone arm drive device for a record player, characterized in that the brake lever is configured to suppress inertia when horizontally rotating the tone arm by transmitting the rotational force of the motor to the idler by swinging the dynamic lever. .