JPS6242322B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device for a pick-up arm having a cartridge at its tip, and its purpose is to automatically lift and lower the pick-up arm using a lift cam and to lift and lower the pick-up arm using a queuing lever. To provide a pick-up arm lifting device that can be operated from any direction.

Generally, the pick-up arm device in an auto player automatically raises and lowers the arm lifter using a lift cam operated by a motor, and the arm lifter automatically raises and lowers the pick-up arm. The automatic elevating and lowering operations and the manual elevating and lowering operations using the queuing lever are each independent of each other, and the elevating and lowering operations cannot be performed from either direction. In other words, the pick-up arm may be lifted under automatic lifting operation using the lift cam and then lowered under manual lifting operation using the queuing lever, or the pick-up arm may be lowered under manual lifting operation using the queuing lever. It is not possible to perform lifting operations such as lifting the pick-up arm and then lowering the lifted pick-up arm under automatic lifting operation by the lift cam. Therefore, although the conventional pick-up arm elevating device has a function of manual elevating and lowering operation using a queuing lever, the elevating and lowering operation is specified, and it is not very convenient to use.

The present invention eliminates such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

FIG. 1 shows one embodiment of the pick-up arm lifting device of the present invention. In the figure, 1 is provided with a head shell 3 for attaching a cartridge 2 at its tip, and a balance weight 4 for adjusting stylus pressure at the other end. 5 is a bearing member for swingably supporting the pick-up arm 1 in the horizontal and vertical directions; 6 is a rest arm for holding the pick-up arm 1 in a stopped position;
7 is an arm lifter for raising and lowering the pick-up arm 1; 8 is a queuing lever for raising and lowering the arm lifter 7; 9 is a motor for automatically raising and lowering the arm lifter 7; belt 10
The arm lifter 7 is connected to a gear reduction mechanism 11, and by operating a lift cam in the gear reduction mechanism 11, the arm lifter 7 is automatically raised and lowered.

As shown in FIGS. 2 and 3, the arm lifter 7 has a lift shaft 14 attached to a bearing 13 embedded in a base plate 12.
A lift arm 15 is provided at the tip of the lift shaft 14, and the other end is in contact with a lift cam 16 operated by the motor 9. A spring 17 is interposed between the retaining ring provided at the lower end of the lift shaft 14 and the bearing 13, and the lower end of the lift shaft 14 is biased by the spring so as to come into contact with the lift cam 16. Further, the wrist shaft 14 is provided with an elevating cam 18 having a projection 18a at its tip. The queuing lever 8 is connected to a lifting cam 18 forming the arm lifter 7 via a clutch mechanism 19 provided between a pair of ribs 12a, 12b of the base plate 12. In the clutch mechanism 19, a connector 21 supported on the rib 12b is rotatably fitted onto a rotating shaft 20 supported on the rib 12a, and the connector 21 is connected to the elevating cam 18. That is, as shown in FIG. 4, the connector 21 has a protrusion 18a provided on the elevating cam 18 inserted into a long hole 21a provided therein. In addition, the rotation shaft 20
is provided with a clutch ring 24 to which a rotating cam 22 is attached by a retaining ring 23 and biased in one direction by a spring 25; A convex portion 22a provided on the rotary cam 22 is fitted into the concave portion 24a and connected to the rotary cam 22. The rotating cam 22 is formed in the shape shown in FIG. 5 so as to rotate integrally with the rotating shaft 20, while the clutch ring 24 is attached to the rotating shaft 20 as shown in FIG. The connector 2 on the outer periphery of the rotating shaft 20 is inserted into the provided rail groove 24b.
The rail protrusions 21b provided at 1 are fitted together and guided so as to be movable in the axial direction. A knob 26 including the cueing lever 8 is attached to one end of the rotating shaft 20. 27 is a cueing lever switch, the operating lever 27a of which is in contact with the rotating cam 22.

FIG. 7 shows a circuit for controlling the operation of the motor 9 that operates the lift cam 16.
28 is a limit switch that detects that the arm lifter 7 is in the raised position; 29 is the arm lifter 7;
30 is a key switch for cueing operation at the front, and each of the above-mentioned switches 27, 28,
29 and 30 are connected to the power supply voltage Vcc via resistors _R1 to _R4 .
is supplied. Numeral 31 is a NOR gate for detecting coincidence between the queuing lever switch 27 and limit switch 28, and outputs a coincidence signal when the arm lifter 7 is in the raised position.
32 is a NOR for detecting coincidence between the above-mentioned queuing lever switch 27 and limit switch 29;
Since the inverter 33 is inserted into the input line of the cueing switch 27, it outputs a coincidence signal when the arm lifter 7 is in the lowered position. 34 is the above NOR gate 31,3
This is an OR gate for calculating the logical sum of the two match signals, and the match signal is applied to the reset terminal of the T flip-flop 36 via the low-pass filter 35. 37 is a NOR gate for detecting a mismatch between the cueing lever switch 27 and the limit switch 28, and since the inverter 33 is inserted into the input line of the cueing switch 27, the arm lifter 7
Outputs a discrepancy signal when is in the raised position.
38 is for detecting a mismatch between the queuing lever switch 27 and the limit switch 29.
This is a NOR gate and outputs a mismatch signal when the arm lifter 7 is in the lowered position. 39 is above
This is an OR gate for taking the logical sum of the mismatch signals of the NOR gates 38 and 37, and the mismatch signal is passed through the low-pass filter 40 to the T flip-flop 3.
The voltage is applied to the set terminal of No. 6.
Therefore, the T flip-flop 36 is
Q is inverted by the mismatch signal from OR gate 39.
Outputs a rotation command signal from the terminal. In addition, the above T
The flip-flop 36 is also inverted when the key switch 30 is operated and outputs a rotation command signal from its terminal. 41 is the limit switch 28,
It is a direction memory that outputs a descending command signal and an ascending command signal under the control of NAND gate 4.
It consists of a type of flip-flop in which 2 and 43 are cross-connected. 44 is an AND for calculating the logical product of the rotation command signal from the T flip-flop 36 and the descending command signal from the direction memory 41.
It is a gate, and its output controls each base voltage of transistors TR ₁ and TR ₂ connected in series.
45 is an AND gate for taking the logical product of the rotation command signal from the T flip-flop 36 and the rise command signal from the direction memory 41, and its output connects the transistors TR ₃ , connected in series.
Controls each base voltage of TR ₄ . The motor 9 is driven by the transistors TR ₁ , TR ₂ and
It is inserted between each emitter connection point of TR ₃ and TR ₄ . Here, the motor control circuit shown in FIG. 7 mentioned above is basically a cueing switch 27 based on the up and down operation of the cueing lever 8 and a limit switch 2 related to the vertical movement of the arm lifter 7.
The direction rotation of the motor 9 is controlled so that the rotation angles 8 and 29 coincide. Similar control is also performed on the key switch 30 based on the operation for cueing at the front.

In the pick-up arm lifting device having such a configuration, the key switch 30 for queuing is operated and the lift cam 16 is moved to the third position by the motor 9.
When the arm lifter 7 is moved in the direction of arrow D in the figure, the arm lifter 7 is raised, and the elevating cam 18 constituting the arm lifter 7 is also raised, so that the connector 21 rotates. At this time, the clutch ring 24 is connected to the rotating cam 22.
The rotary shaft 20 on which the rotary cam 22 is mounted is engaged with the rotary cam 22 with unevenness, and is strongly pressed against the rotary cam 22 by a spring 25, so that the rotary cam 22 rotates integrally with the rotary cam 22.
rotates as one unit to lift the cueing lever 8. On the other hand, since the queuing lever switch 27 is turned on by the rotation of the rotary cam 22, when the arm lifter 7 is raised and the limit switch 28 is turned on, the rotation of the motor 9 is stopped. In this state, when the key switch 30 for queuing is operated again, the motor 9 reverses and the lift cam 16 is moved in the direction opposite to the direction of arrow D in FIG. 3, so the arm lifter 7 is lowered.
The elevating cam 18 constituting the arm lifter 7 also descends, and the connector 21 is reversed. At this time, the clutch ring 24 is engaged with the rotary cam 22 through unevenness, and is strongly pressed against the rotary cam 22 by the spring 25, so that the clutch ring 24 rotates as one unit, and the clutch ring 24 is rotated as a unit. The rotated shaft 20 also rotates as one unit to return the cueing lever 8 to its original position. On the other hand, since the queuing lever switch 27 is turned off by the rotation of the rotation cam 22, the arm lifter 7 is lowered and the limit switch 29 is turned off.
When turned on, the motor 9 stops rotating.
In this way, the automatic lifting and lowering operation of the cueing is performed.

When the above-mentioned cueing lever 8 is lifted manually, the rotating shaft 20 rotates and the rotating cam 2
2 rotates, and the cueing lever switch 27 is turned on. At this time, since the biasing force of the spring 17 is larger than the biasing force of the spring 25, when the rotating cam 22 rotates, the clutch ring 24
The clutch ring 24 slides to the left as the uneven engagement between the clutch ring 24 and the clutch mechanism 19 disengages.
The coupling relationship between the cueing lever 8 and the arm lifter 7 is released. On the other hand, when the motor 9 rotates under the control of the queuing lever switch 27 and the lift cam 16 is moved in the direction of arrow D in FIG. 3, the arm lifter 7 is raised. Since the elevating cam 18 is also raised, the coupling 21 rotates and the clutch ring 24 also rotates.
The uneven engagement between the rotating cam 22 and the rotary cam 22 is restored. Then, when the arm lifter 7 is raised and the limit switch 28 is turned on, the rotation of the motor 9 is stopped. When the cueing lever 8 is lifted in this state, the rotating cam 22 rotates together with the rotating shaft 20, and the cueing lever 27 is turned off. At this time, the rotating cam 22 rotates due to the force relationship between the spring 25 and the spring 17, but the clutch ring 24 cannot rotate, and its uneven engagement disengages, thereby locking the clutch mechanism 19 between the cueing lever 8 and the arm lifter 7. The binding state due to is canceled. On the other hand, the motor 9 is reversed under the control of the queuing lever switch 27, and the lift cam 16 is moved in the direction opposite to the direction of arrow D in FIG. The connector 21 rotates together with the clutch ring 24, and the uneven engagement between the clutch ring 24 and the rotating cam 22 is restored. When the arm lifter 7 is lowered and the limit switch 29 is turned on, the motor 9 is stopped from rotating. In this way, the cueing operation is performed.

When the arm lifter 7 is raised under the control of the key switch 30 for cueing and the lifted cueing lever 8 is lifted down, the rotating cam 22 is moved together with the rotating shaft 20.
The cueing lever switch 27 is turned off by the body rotation. At this time, spring 25 and spring 17
Although the rotating cam 22 rotates due to the force relationship, the clutch ring 24 cannot rotate, and the engagement between the protrusions and recesses is disengaged, and the coupling relationship between the cueing lever 8 and the arm lifter 7 by the clutch mechanism 19 is released. One side, the above-mentioned queuing lever switch 27
The motor 9 reverses under the control of the lift cam 1.
6 is moved in the direction opposite to the direction of arrow D in FIG. 3, the arm lifter 7 is lowered. Then, the connector 21 associated with the arm lifter 7 rotates together with the clutch 24, and the clutch ring 2
4 and the rotary cam 22 are restored, the arm lifter 7 is lowered, and the limit switch 29 is turned on, and the rotation of the motor 9 is stopped.

When the key switch 30 for cueing is operated with the arm lifter 7 raised under manual operation of the cueing lever 8,
The reverse rotation of the motor 9 causes the lift cam 16 to move in the direction opposite to the direction of arrow D in FIG. For this purpose, the clutch ring 24 rotates together with the connector 21, and the rotation shaft 20 rotates due to the uneven engagement between the clutch ring 24 and the rotation cam 22, and the queuing lever 8 is returned to its original position. At the same time, when the arm lifter 7 is lowered and the limit switch 29 is turned on, the rotation of the motor 9 is stopped.

As described above, according to the present invention, a queuing lever for raising and lowering is connected to an arm lifter that can be automatically raised and lowered by a lift cam via a clutch mechanism, and the clutch mechanism is operated by an arm lifter that is automatically raised and lowered by a lift cam. When the cueing lever is rotated, it is connected so that the operating force during manual operation of the cueing lever cannot be transmitted to the arm lifter, and is turned on and off by a rotating cam provided in the clutch mechanism. Since the lift cam is configured to be controlled by a cueing lever switch, the lift cam can be lifted and lowered from either direction, either automatically or by using the cueing lever. It can be significantly improved and made easier to use.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the pick-up arm lifting device of the present invention, FIG. 2 is an enlarged plan view of the main part of the device, and FIG. 3 is an enlarged sectional view of the main part of the device.
Figure 4 is a cross-sectional view taken along line AA in Figure 3, Figure 5 is a cross-sectional view taken along line B-B in Figure 3, Figure 6 is a cross-sectional view taken along line C-C in Figure 3, and Figure 7 is a motor in the same device. Control circuit 1
FIG. 2 is a circuit diagram showing an example. 7... Arm lifter, 8... Queuing lever, 9... Motor, 10... Belt, 11... Gear reduction mechanism, 13... Bearing, 14... Lift shaft,
15...Lift arm, 16...Lift cam, 1
7... Spring, 18... Lifting cam, 19...
Clutch mechanism, 20... Rotating shaft, 21... Connector, 22... Rotating cam, 24... Clutch ring, 25... Spring, 27... Queuing lever switch.

Claims (1)

[Scope of Claims] 1. A queuing lever for lifting and lowering is connected to an arm lifter that is automatically raised and lowered by a lift cam driven by a motor, and the clutch mechanism is operated by the lift cam to raise and lower the arm lifter. When the arm lifter is automatically raised and lowered, the cueing lever is rotated by the arm lifter, but when the arm lifter is raised and lowered by the cueing lever, the operating force of the cueing lever is not transmitted to the arm lifter, and the above-mentioned A pick-up arm lifting device characterized in that a queuing lever switch turned on and off by a rotary cam provided in a clutch mechanism is configured to control the motor and drive the lift cam. 2. The clutch mechanism loosely fits a connector connected to a lifting cam provided on an arm lifter onto a rotating shaft provided with a queuing lever, and a clutch ring is provided on the shaft of the connector so as to be slidable in the axial direction. 2. A pick-up arm elevating device according to claim 1, wherein said clutch ring is spring-biased and brought into pressure contact with a rotating cam attached to said rotating shaft.