JPS5810165Y2 - Arm elevation device for linear tray sprayer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an arm elevation device for a beam tracing player.

Generally, a linear trace player has a tone arm that is supported for vertical and horizontal pivoting by bearings fixed to a movable support, and as the stylus moves inward in a radius of the record during playing. By moving the movable support in the same direction as the tone arm, the entire tone arm is moved in parallel, and the movement of the movable support is stopped when the stylus passes the end of the tone groove on the record at the end of the performance. This causes the tone arm to pivot in the horizontal direction about the bearing and toward the inside of the record.

Therefore, an arm elevation device that pivots the tone arm to raise the stylus from the record after a performance ends causes the tone arm to pivot in the vertical direction to raise the stylus, and the stylus also rises. By causing the tone arm to pivot outward from the radius of the record in between, after the arm elevation device is activated, the movable support is moved in the direction opposite to that during playing, and the tone arm is returned to the position before the start of playing. It has a configuration that allows it to be returned.

Several proposals have been made in the past for the configuration of the above-mentioned arm elevation device, but all of these configurations allow the tone arm to pivot in the vertical direction and in the horizontal direction at the same time, thus moving the stylus onto the record disc. It is made to move away from the sound groove by raising it obliquely toward the outside of the radius.

Therefore, when the stylus separates from the sound groove, friction occurs between the stylus and the side surface of the sound groove, and this friction may damage the stylus and the sound groove, and at the same time, there is a disadvantage that unpleasant scratching noise is generated when the friction occurs. there were.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional devices and provide an arm elevation device for a linear trace player that allows the tone arm to pivot vertically and horizontally after the end of a performance. This is the purpose.

The present invention will be explained below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, there is shown a near trace player equipped with an arm elevation device according to an embodiment of the present invention.

This linear trace player includes a tone arm 1 configured to be pivotable vertically and horizontally by a bearing 10 fixed to a movable support body composed of a movable chassis 4 and an arm base 6.

The tone arm 1 has a cartridge I having a stylus 8 attached to its front end, and a counterweight 9 attached to its rear end.

Next, the above-mentioned arm elevation device includes a pivot operation member consisting of a pin 2 that is integrally provided on the tone arm 1 so as to project toward the rear (left side in FIG. 1) of the bearing 10, and a pivot operation member that is operated by the pin 2. The structure includes a suppressing device 3 that is connected to the arm base 6, and a cam plate 5 that is fixed to an arm base 6.

In addition, in FIG. 1, 21 and 22 indicate a turntable and a cabinet, respectively.

The suppression device 3 includes a slider 13 connected to the piston 12 of the oil damper 11 fixed to the arm base 6 and formed with a slot 13' that engages with the pin 2.

This slider 13 is configured to be movable in the vertical direction, and as it moves, a downward pressing force is applied to or removed from the pin 2 by the upper edge 13a' of the slot 13'. There is.

By controlling the pressing force applied to the pin 2 in this way, the vertical pivoting of the tone arm can be controlled.

In other words, when no downward pressure is applied to the pin 2, the tone arm 1 pivots about the bearing 10 in the direction of lowering the cartridge 7 (see the arrow in FIG. 1), and the stylus 8 to engage the record 20 with an appropriate stylus pressure (this adjustment is performed by adjusting the mounting position of the counterweight 9 relative to the tone arm 1, etc.).

Therefore, as the slider 13 moves upward from the position shown in FIG. As the tone arm is lowered toward the disc 20 and the slider 13 is moved downward to push down the pin 2, the tone arm pivots in the opposite direction of the arrow to raise the stylus 8.

The downward movement of the slider 13 is achieved by a pivot lever 14 which is pivoted 19 to the arm base 6 at approximately the center and connected to the piston 12 of the oil damper 11 at the right end (FIG. 2). An electromagnetic plunger 16 has a plunger rod 16' connected to the left end (FIG. 2) of the pivot lever 14 via a spring 15, and is fixed to the arm base 6, and the right part of the pivot lever 14 and the arm base. 6 and a second spring 17 installed between the two springs.

In addition, in FIG. 2, 18 indicates a microswitch.

Next, the cam plate 5 is composed of a plate having a V-shaped notch 5a at its upper end and a side edge of this notch serving as a cam surface 5' that engages with the pin 2. The pin 2 is fixed to the arm base 6 at a position separated from the pin 2 in the axial direction (see FIG. 2).

The notch 5a is formed so that the pin 2 is inserted into the first position by the slider 13.
By locking the pin 2 between the upper edge 13a of the slot 13' and the bottom of the notch 5a when the tone arm 1 is pressed to the lowest position shown in the figure, the tone arm 1 is firmly held in the horizontal position. It is designed to be fixed.

The illustrated near trace player has the above-mentioned construction, and its operation will be explained below with reference to FIGS. 1 to 4.

Before starting the performance, the plunger 16 is in a de-energized state and the pivot lever 14 is maintained in a horizontal position (first
, 2 and 3a).

In this state, the slider 13 is at the lowest position, so
The tone arm 1 is held in a horizontal position to raise the stylus 8 from the record 20.

Next, the tone arm 1 is moved to the performance starting position A-A (Fig. 4).
When this occurs, a well-known sensor (not shown) emits an electrical signal to energize the plunger 16, causing the plunger rod 16' to be retracted downwardly.

Therefore, the pivot lever 14 pivots counterclockwise to raise the slider 13 (FIG. 3b), and the tone arm 1 accordingly pivots in the direction of arrow D (FIG. 1) to move the stylus 8 onto the record disc. 20, and then the performance begins.

Note that in the state shown in FIG. 3b, the upper edge 1 of the slot 13'
3. f has reached a position far above pin 2.

The above-mentioned raising of the slider 13 and accompanying lowering of the stylus 8 are performed gently by the action of the oil damper 11.

Generally, the retraction force of the rod of the electromagnetic plunger is small at the start of retraction, and tends to increase rapidly as the amount of retraction increases. The pivot lever 140 is designed to pivot counterclockwise even when the retraction force at the start of retraction is small.

That is, in the above player, when the amount of downward retraction of the rod 16' reaches a predetermined value, the pivot lever 1
The first spring 15 is stretched without pivoting of 4;
When the retraction amount reaches a predetermined value and the retraction force increases to a predetermined value of 1, the increased retraction force and the restoring spring force of the stretched first spring 15 cause the pivot lever 14 to move counterclockwise. A pivot in the direction is initiated.

By providing the first spring 15 in this manner, it is possible to use a small-capacity plunger with a small retraction force when the rod starts to be retracted.

Further, the above-mentioned sensor is usually composed of an optical sensor attached to the tip of the cartridge, and there is a possibility that a detection error may occur when vibration of the tone arm occurs.

However, in the above player, when the slider 13 is at the lowest position (FIGS. 1, 2 and 3a), the upper edge 13a' of the slot 13' and the notch 5 of the cam plate 5
Since the tone arm 1 is firmly fixed in a horizontal position by locking the pin 2 between the pin 2 and the bottom of the tone arm 1, the above-mentioned detection error due to vibration of the tone arm 1 does not occur.

Note that it is of course possible to provide a configuration in which the plunger 16 is excited by manually giving a signal to start playing without using the sensor as described above.

Next, as the performance progresses, the stylus 8 moves toward the inner radius of the record 200 while engaging with the sound groove of the record 20, and in accordance with the movement, the movable chassis 4 also moves in the same direction.

Therefore, the tone arm 1 moves in parallel toward the inside of the record 20.

Thus, the stylus 8 engages the end of the sound groove B-
When the tone arm 1 moves at position B (Fig. 4) 1, the movable chassis 4 stops, and then when the stylus 8 engages with the end of the tone groove and moves further inward of the record 20, the movement stops. In response to this, the tone arm 1 pivots horizontally about the bearing 10 toward the C-C position (FIG. 4).

Incidentally, while the tone arm 1 comes to the CC position after the performance starts, the plunger 16 is kept in the excited state shown in FIG. 3b.

Further, while the tone arm pivots from the B-B position to the C-C position, the position of the pin 2 with respect to the cam plate 5 gradually changes.

That is, when the tone arm 1 is at the B-B position, the pin 2 is in a vertically elevated position from the bottom of the notch 5a as shown in FIG. 3b, but when the tone arm 1 reaches the C-C position, , the pin 2 is in a position displaced to the left from the position shown in Fig. 3b (see Fig. 3C).

Next, when the tone arm 1 reaches the C-C position, an electric signal is sent to automatically or manually de-energize the plunger 16, and the retraction force applied to the rod 16' is removed. .

At this time, the second spring 17 is in a considerably stretched state due to the counterclockwise pivoting of the pivot lever 140, so the restoring force of the stretched second spring causes the pivot lever to 14 is gradually pivoted clockwise, and the slider 13 moves downward in response (FIG. 3c).

When the slider 13 moves downward by a predetermined amount, the upper edge 13a' of the slot 13' engages with the pin 2. When the slider 13 moves further downward thereafter, the pin 2 moves vertically downward in response to the movement. The tone arm 1 therefore pivots in the direction opposite to arrow D (FIG. 1) to vertically raise the stylus 8 and remove it from the sound groove.

After the stylus 8 vertically rises and leaves the sound groove, the slider 13 further descends and the pin 2 moves vertically downward accordingly, causing the pin 2 to engage with the cam surface 5' of the cam plate 5 ( Fig. 3d: Therefore, when the slider 13 moves further downward and presses the pin 2 downward, the pin 2 moves along the cam surface 5' in the direction of arrow a (Fig. 3d), and accordingly the tone arm 1 is arrow D (Figure 1)
The stylus 8 further rises by pivoting in the opposite direction to the B-
Reach position B (Figure 4).

When the tone arm 1 reaches the B-B position in this way, the slider 13 is moved to the lowest position (Nos. 1.2 and 3a).
Figure).

Further, after the tone arm 1 reaches the BB position, the tone arm 1 is moved in parallel with the movable chassis 4 toward the AA color position, and is returned to the position before the performance starts.

The microswitch 18 applies a large current to the plunger 16 when the plunger 16 is in the non-excited state shown in FIG. On the other hand, during playing, the plunger 16 is kept in an energized state and the plunger rod 16' is maintained in the downwardly retracted position (Fig. 3b).
In this case, the current supplied to the franchisor 16 is reduced to save power consumption.

The supply of current to the plunger 16 is always cut off regardless of the state of the microswitch 18 after the plunger 16 is de-energized after the end of the performance.

Further, the second spring 17 is in a somewhat stretched state even when the pivot lever 14 is in the horizontal position as shown in FIG. 3a, and always biases the pivot lever 14 in the clockwise direction. .

Therefore, when the plunger 16 is in the de-energized state, the slider 13 is always urged toward the lowermost position, and the stylus 8 is reliably maintained in the position raised from the record 20.

Note that the pivot lever 14 further pivots clockwise from the state shown in FIG. 3A due to the spring force of the second spring 17, and a stopper ( (not shown) is provided.

As is clear from the above explanation, the arm elevation device of the present invention raises the stylus perpendicularly to the record until the stylus leaves the tone groove after the end of the performance, and then raises the stylus vertically to the record when the stylus is further raised. This causes the tone arm to pivot outward from the radius of the disc.

Therefore, it is possible to eliminate the drawback of the conventional device due to friction between the stylus and the side surface of the sound groove when the stylus leaves the sound groove.

In the illustrated embodiment, the pressing device 3 cooperates with the pin 2 and the cam plate 5 to control the pivoting of the tone arm 1 which is pressed at all points in the operation of the linear trace player. .

However, it is of course possible to modify this pressing device and pin so that they function only as components of an arm elevation device that controls the pivoting of the tone arm 1 when raising the stylus after a performance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a near trace player equipped with an arm elevation device according to an embodiment of the present invention, and FIG.
The left side view of the figure, Figures 3a to 3d are diagrams illustrating the operation of the pressing device at each point in the operation of the player in relation to the pivot operation member and the cam plate, and Figure 4 is the operation of the player. FIG. 3 is a schematic diagram showing the movement of the tone arm during time. 1... Tone arm, 2... Pin (pivotal operating member), 3... Pressing device, 4...
・Movable chassis, 5...Cam plate, 6...
... Arm base, 7... Cartridge,
8... Stylus, 10... Bearing, 1
1...Oil damper, 14...Pivotal lever 16...Electromagnetic plunger.

Claims (1)

[Claims for Utility Model Registration] (1) A linear tone arm having a stylus and a counterweight attached to the front and rear ends, respectively, and a tone arm supported pivotably in vertical and horizontal directions by bearings fixed to a movable support. An arm elevation device for a trace player includes a pivot operating member integrally protruding from the tone arm at a position rearward of the bearing, and a pivot operating member operatively connected to the operating member, the pivot operating member being operatively connected to the operating member and configured to rotate when receiving a signal to end a performance. a pressing device for pivoting the tone arm to raise the stylus from the record by pressing the operating member downward; and a cam plate having a cam surface fixed to the movable support and engaged by the operating member. After the performance is finished, the operating member is pressed downward and the stylus is separated from the sound groove of the record. While the supporting operating member is further pressed downward, the cam surface and the operating member engage with each other. An arm elevation device characterized by being configured to cause a tone arm to pivot in a horizontal direction. (2) Utility Model Registration Scope of Claims 1. In the arm elevation device according to claim 1, the operating member is constituted by a pin protruding integrally from the tone arm, while the pressing device is movable in the vertical direction. A tossle arm elevation device comprising a slider configured and formed with a slot for engaging the pin. (3) In the arm elevation device according to claim 2 of the utility model registration claim, the cam plate is constituted by a plate having a ■-shaped notch at its upper end, and the side of the notch is An arm elevation device characterized in that the cam surface is formed by an edge. 0) Utility model registration The arm elevation device according to claim 3, further comprising an oil damper having a piston connected to the slider and fixed to the movable support; a pivoting lever pivotally mounted to a movable support at a portion thereof and coupled to a piston of the oil damper at one end; and a plunger rod operatively coupled to the other end of the pivoting lever, the lever having a plunger rod operatively coupled to the other end of the pivoting lever; an arm elevation device comprising: a plunger that pivots the pivot lever when the plunger is moved downwardly to move the piston and the slider connected thereto; (5) Utility model registration The arm elevation device according to claim 4, wherein the plunger rod and the other end of the pivot lever are connected via a spring. .