JPS6132263A - Front loading system record player - Google Patents

Abstract

PURPOSE:To perform unloading operation speedily without causing an arm body a stabilizer to contact each other by detecting a noncontact position between the base part of a toner arm and the stabilizer in the unloading operation of a slide plate by a position detecting means. CONSTITUTION:When an open/close switch 84 is operated right after or in the middle of play, the toner arm 22 is moved toward the outer periphery, and the slide plate 1 begins to be unloaded by a slide plate driving circuit 86 when the tone arm reaches a position shown by an alternate long and two short dashes line, i.e. at the timing where the slider 26 fitted to an arm body 23 reaches the projection part 93B on a position detection substrate 90 indicating a 17cm drop point (about 85mm. away from the center of a turntable 12) and the counted value of a count memory 82 changes from ''4'' to ''3''. Therefore, even when the arm body 23 is moved forth according to the unloading operation of the slide plate 1, the arm body 23 never contacts the stabilizer 51.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a front-loading type record player having a front-loading mechanism that moves a slide plate to which a turntable or the like is attached in the front-rear direction. It relates to a device that is equipped with a stabilizer on the casing side to make it stick closely to the table.

[Conventional technology]

2. Description of the Related Art Conventionally, a front-loading type record player is known which has a so-called front-loading mechanism that moves a slide plate to which a turntable or the like is attached in the front-back direction. In this front-loading type record player, the turntable is generally attached to a slide plate, and, for example, a linear tracking type tone arm is attached to the housing side. For example, by operating the open/close switch provided on the front panel, the slide plate housed inside the housing can be moved forward (hereinafter referred to as unloading). In this state, set the record on the turntable. When you have finished setting the record, operate the open/close switch again, and the slide plate will be moved rearward and housed in the housing. (Hereinafter referred to as loading.) Then, by operating the start/stop switch, the turntable is rotated, and the stylus tip of the cartridge attached to the tone arm is lowered into the introduction groove of the record, and the performance begins. It is now possible to do so. When the performance ends and the stylus of the cartridge enters the lead-out groove on the innermost circumference of the record, the cartridge is raised and the tone arm is returned to the initial rest position. At the same time, the rotation of the turntable is stopped. If the open/close switch is operated, the slide plate is moved forward and the record can be taken out. To start playing again,
Instead of operating the open/close switch, just operate the start/stop switch mentioned above. In this way, front-loading type record players generally operate as so-called fully automatic type record players because the tone arm to which the cart IJ nozzle is attached is always inside the housing and cannot be operated manually. It has become.

On the other hand, stabilizers are generally known that improve the quality of reproduced sound by bringing a record into close contact with a turntable and suppressing vibrations. This stabilizer is not necessarily necessary when playing records normally, but if the diameter of the turntable is small, it becomes indispensable to stabilize the record. For example, a double-sided front-loading record player equipped with two tone arms each equipped with a cartridge for playing the front side of a record and one for playing the back side of the record uses a turntable about the diameter of a record Pooyal. Because it is necessary, it is impossible to lack a stabilizer. Further, in such a record player, the stabilizer is usually provided on the housing side so as to be freely removable.

[Problem that the invention seeks to solve]

The front-loading type record player described above does not require any space above and can be stacked, compared to a normal record player where the dust cover is opened and closed to place the record on the turntable. For example, it can be placed comfortably in the middle of an audio rack, saving space. However, on the other hand, the tone arm is attached to the housing and remains inside the housing even when the slide plate is unloaded, making it difficult to replace the needle or remove dust from the needle tip. I can't. Therefore, windows are generally provided on both sides of the housing at positions corresponding to each cartridge, and it is possible to replace the needle and remove dust from the needle tip through this window, but the plate that covers the window is usually tightened with screws. Because of this, you have to take the trouble to remove this board every time you work on it, which is a hassle.

Also, if you operate the audun close switch immediately after a performance ends or during a performance, the cartridge is normally raised and the tone arm is returned to the rest position.
Since the slide plate is unloaded, it takes too much time and is irritating to the user.

In order to eliminate the above-mentioned trouble, for example, the tone arm should be forcefully mounted on the slide plate side of the housing, and the needles should be replaced or dust removed from the stylus tip with the slide plate unloaded. You should do it. Furthermore, in order to reduce the time required to start the unloading operation when the open/close switch is operated immediately after the end of a performance or during a performance, the tonearm is not returned to the rest position, but immediately after the cartridge is raised. What is necessary is to start the unloading operation. However, for example, in the case of a front-loading record player with double-sided performance, where the stabilizer is installed on the housing so that it can be raised and lowered, the base of the tone arm, the so-called arm body, which is moved forward during unloading. There is a risk that the stabilizer may come into contact with the stabilizer.

Therefore, the present invention has been made in view of the above-mentioned conventional problems.In a front-loading type record player in which the stabilizer is provided on the housing side and the tone arm is provided on the slide plate side, To perform an unloading operation quickly without contact between the body of a tone arm and a stabilizer when an open/close switch is operated during a performance.

[Means for solving problems]

In order to achieve the above-mentioned object, a front-loading type record player according to the present invention is provided in the casing so as to be movable in the front-back direction through the front opening of the casing, and is moved through the front opening by an unloading operation. a slide plate that is fed out and stored in the housing by a loading operation; a near-tracking tone arm provided on the slide plate; a turntable provided on the slide plate on which a record is placed; A rotatable stabilizer that is provided on a housing so as to be movable up and down and presses a record against the turntable in a lowered state, and a position of the tone arm where the unloading operation is performed without the base of the tone arm and the stabilizer coming into contact with each other. The present invention is characterized by comprising: a position detecting means for detecting the position of the slide plate; and a control means for starting the unloading operation of the slide plate in response to a signal detected by the position detecting means.

[For production]

In the present invention, the unloading operation is started when the position detecting means detects the non-contact position between the base of the tone arm and the stabilizer accompanying the unloading operation of the slide plate.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a double-sided front-loading record player will be described in detail below with reference to the drawings.

First, the mechanism of the reflex cord player of this embodiment will be explained with reference to the plan view of FIG. 2, the front view of FIG. 3, and the right side view of FIG. 4. In this record player, a phono motor 11 is attached to approximately the middle of the slide plate 1.
1 rotates the turntable 12. Further, on the right rear side of the slide plate 1, an arm body 23 is attached via guide shafts 24 and 25 to support a tone arm 22 to which a cartridge 21 for playing the surface of the record R is attached. An arm body 33 supporting a tone arm 32 to which a cartridge 31 for playing the back side of a record R is attached is attached to the rear left side of the slide plate 1 via guide shafts 34 and 35. Each of the arm bodies 23, 33, that is, each tone arm 22, 32 is driven by a motor (not shown), etc., and moves in the radial direction of the record R along guide shafts 24, 25 and 34, 35, respectively. will be moved to Each of the tone arms 22.32 is adapted to be moved in the vertical direction by lifting means provided within each arm body 23.33. Furthermore, gear 41
A motor block 42 is attached to the slide plate 1 so that the motor block 42 protrudes downward from the slide plate 1 and engages with a rack 43 fixed to the housing 2 side. The whole thing is moved back and forth to allow loading and unloading operations. Note that rollers 44 and 45 are provided on the bottom surface of the slide plate 1 to smoothly perform the loading and unloading operations.

A pressing arm 52 having a stabilizer 51 rotatably attached to its tip is attached to the housing 2 side so that the stabilizer 51 is movable in the vertical direction. and,
When loading the slide plate 1, the lever 61 provided at the rear of the slide plate 1 causes the pressing arm 52 to be
The contact piece 53 is pushed and the stabilizer 51 is moved downward, that is, the state shown by the two-dot chain line in FIG. Closely attached. The lever 61 is biased by a tension coil spring 63 provided between the cut and raised piece 60 of the slide plate 1 and the screw 63 in a direction in which the pressing force against the record R is increased (toward the rear of the slide plate 1). ing. Further, the screw 62 is for adjusting this force.

On the other hand, when the slide plate 1 is unloaded, the lever 61 releases the contact piece 53 of the press arm 52, and the tension coil spring 71 pulls the press arm 52 upward, so that the stabilizer 51 is moved as shown in FIG. It is moved upward as shown by the two-dot chain line.

The double-sided front-loading type record player of this embodiment having the above-mentioned mechanical section is equipped with an electric circuit section having a structure as shown in FIG. The configuration of the front side of the record is for playing on the front side of the record, and the same configuration is used for playing on the back side of the record, so illustration thereof is omitted here. In FIG. 1, the position detecting means 81 is for detecting the position of the tone arm 22.
The configuration is as shown in FIG. 5(A) and FIG. 5(B). That is, as shown in FIG. 5(A), three patterns 91, 92.degree. 93 are formed on the position detection substrate 90. The pattern 91 is formed to have the same width over its entire length and is connected to a terminal 94. pattern 92
is formed with a convex portion 92A at a position corresponding to the rest position of the tone arm 22, and is connected to a terminal 95. The pattern 93 has four convex parts 93A, 93B, 9
3C.

93D and is connected to the terminal 96. Here, the convex portion 93A and the convex portion 93C are 30CT.
It is provided at a position corresponding to the drop point (hereinafter referred to as 30cnL drop point) and return point (hereinafter referred to as 30crIL return point) of the tone arm 22 when playing an L-diameter record disc, so-called LP disc. shi, convex portion 93B and convex portion 93D
is the drop point of the tone arm 22 when playing a 17cnL diameter record (so-called EP) (hereinafter referred to as
It is called 17crfL drop point. ) and a return point (hereinafter referred to as 1m return point).As shown in FIG. 5(B), a slider 26 is attached to the arm body 23. The slider 26 of the cage and the arm body 2
3, that is, each convex portion 92A is slid on the position detection board 90 as the arm 22 moves.

When located on 93A, 93B, 93C, and 93D, the terminals 94.95 or 94.96 become electrically conductive.

Such position detection means 81 is connected to a count memory 82. This count memory 82 performs a counting operation based on the conduction or non-conduction between the terminals 94 and 95 or between the terminals 94 and 96 of the position detection means 81, and sends a count value signal indicating the position of the tone arm 22 to the control circuit 83. . For example, when the tone arm 22 is in the rest position, the slider 26 is in the position of the protrusion 92A, so the terminal 94.95
During this period, the current is in a conductive state, and the current memory 82 is thereby cleared. Further, the tone arm 22 is moved in the inner circumferential direction by a tone arm drive circuit 88 to be described later, and the slider 26 is moved to the convex portion 93 at the 30cIrL drop point.
When reaching A, the non-conducting state to the conducting state between terminals 94 and 96 changes, and the count value of the sicalant memory 82 changes to "0".
will be changed from ``1'' to ``1''. Furthermore, when the tone arm 22 is moved in the inner circumferential direction and the slider 26 finishes passing through the convex portion 93A, the terminals 94 and 96 change from a conductive state to a non-conductive state, and the count value of the sicalant memory 82 becomes "1" to "2"
' is changed to '. Thereafter, the count value of the count memory 82 is sequentially increased in accordance with the change between the terminals 94 and 96 from a conductive state to a non-conductive state and from a non-conductive state to a conductive state. Finally, slider 2
When the number 6 approaches the convex portion 93D of the 17th box return point, the count value of the count memory 82 is changed from "6" to [7].

Conversely, when the tone arm 22 is moved in the outer circumferential direction, the count is counted according to the change from the conductive state to the non-conductive state between the terminals 94 and 96, and from the non-conductive state to the conductive state. The count value of the memory 82 is decremented sequentially.

In addition to the count value signal from the count memory 82 indicating the position of the tone arm 22, the control circuit 83 is supplied with a record size detection signal indicating the size of the record from a powerful record size detection means shown in the figure. This allows control to be performed according to the size of the record. The control circuit 83 also includes an open/close switch 84 and a start/stop switch 8.
5 is connected. This control circuit 83 drives the slide plate drive circuit 86° tone arm 2 which drives the slide plate 1 by driving the motor block 42.
Tone arm lifting circuit 87. A tone arm drive circuit 88° that drives the tone arm 22 along the guide rails 24 and 25 and a turntable drive circuit 89 that rotates the turntable 12 by driving the phono motor 11 are controlled. .

A case will be described in which, for example, a 30-caliber record is played in the double-sided front-loading type record player of the present embodiment as described above.

First, when the open/close switch 84 is operated, the slide plate 1 is unloaded by the slide plate drive circuit 86. After setting the record on the turntable 12, the slide plate 1 is loaded by operating the open/close switch 84 again.

At this time, the record size detecting means (not shown) detects that the set record has a diameter of 30 CIrL, and this signal is supplied to the control circuit 83. Next, by operating the start/stop switch 85, the turntable drive circuit 89 rotates the turntable at 33'/3 r, p, m, and then the tone arm drive circuit 88 rotates the tone arm 22.
is moved inward from the rest position, and when the position detecting means 81 detects the 930cm drop point, the tone arm 22 is stopped at that position, and the tone arm 22 is moved by the tone arm lifting circuit 87. The stylus tip of the rope cartridge 21 is lowered into the introduction groove of the record to start playing. During performance, the drive of the tone arm 22 is controlled by the tone arm drive circuit 88. When the performance ends and the tip of the cartridge 210 enters the lead-out groove of the record, the position detecting means 81 detects the 30cn'L return point, and the tone arm lifting circuit 87 raises the tone arm 22. The tone arm 22 is moved in the outer circumferential direction by the tone arm drive circuit 88, and when the rest position is detected by the position detection means 81, the tone arm 22 is stopped at that position.

At the same time, the rotation of the turntable 12 is stopped. Here, the open/close switch 84
If you operate the slide plate 1, the slide plate drive circuit 86
You can anno load the record and take it out.

In addition, in order to start playing the front side of the record again without taking out the record, it is sufficient to operate the start/stop switch 85 without operating the open/close switch 84. You can also leave it as is. Additionally, the back side of the record can be played in the same way as described above, and of course it is also possible to perform continuous play from the front side to the back side, continuous play from the back side to the front side, or repeat play in which the front and back sides are played alternately. can.

In the above description, a record disc having a diameter of 30 cIrL is played, but the performance can be similarly performed for a record disc having a diameter of 17 crL. That is, at the start of the performance, the tone arm 22 is lowered at the 17CrrL drop point, and when the performance is finished, the tone arm 22 is raised at the 17CIn return point and returned to the rest position.

By the way, the above-mentioned 30cTL diameter or 17cfrL
When performing, especially on the front surface of a record with a diameter of When it is moved and reaches the position shown by the two-dot chain line in FIGS. 2 and 3, that is,
The slider 26 attached to the arm body 23 is 17c
Convex portion 9 on the position detection board 90 indicating the IrL drop point (approximately 85 degrees from the center of the turntable 12)
3B and the count value of the count memory 82 changes from "14" to "3", the unloading operation of the slide plate 1 by the slide plate drive circuit 86 is started. Therefore, even if the arm body 23 is moved forward as the slide plate 1 moves, the arm body 23 will not come into contact with the stabilizer 51. This allows the unloading operation to be performed more quickly than in the past. Incidentally, if the tone arm 22 is located in the outer circumferential direction than the 17CIn drop point when the oven close switch 84 is operated during the performance, the unloading operation is immediately performed.

Also, here, approximately 85 mm from the center of the turntable 12
The existing 17cnl drop point at the ball position is detected and the unloading operation of the slide plate 1 is started, but basically the arm body 23 is moved to a position where it almost comes into contact with the stabilizer 51. All you have to do is start the unloading operation when you move, and for this,
As the position detection means 81, for example, one having a configuration as shown in FIG. 6 may be used. That is, tone arm 2
The arm body 23 attached to the belt 102.2 is driven by the motor 01. Warm 103. and gear 104
It is designed to be driven through. warm 103
A propeller 105 is provided on the rotating shaft of the photointerrupter 106, and the blades of the propeller 105 interrupt the light emitting element and the light receiving element of the photointerrupter 106 to extract a signal synchronized with the rotation of the motor 01 as a pulse. I can do it. For example, if the propeller 105 has three blades, three pulses will be generated each time the worm 103 rotates once. By counting these pulses in the counter memory 82, the position of the tone arm 22 can be detected.

Therefore, if a position where the arm body 23 does not come into contact with the stabilizer 51 (non-contact position) is stored and set in advance in the memory in the control circuit 83, the unloading operation can be started at that position. Further, the rest position can be detected by an armrest switch 107 provided separately.

Note that the present invention is not limited to double-sided play, but can be applied to a front-loading type record player in which the tone arm is provided on the slide plate side and the stabilizer is provided on the housing side.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, according to the front-loading record player according to the present invention, when the open/close switch is operated immediately after a performance ends or during a performance, the arm body and the stabilizer do not come into contact with each other. Since the unloading operation is started by detecting the position, the unloading operation can be performed quickly without contact between the arm body and the stabilizer.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main structure of the electric circuit section for surface play of a double-sided front-loading record player which is an embodiment of the present invention, and FIG. 2 is a mechanism of the above-mentioned double-sided front-loading record player. FIG. 3 is a front view, FIG. 4 is a right side view, and FIGS. 5(A) and 5(B) are configuration diagrams showing an example of the position detection means. , FIG. 6 is a configuration diagram showing another example of the position detection means. 1... Slide plate 2... Housing 12... Turntable 22... Tone arm 23... Arm body 51... Stabilizer 81 - Position detection means 83... Control circuit patent applicant
Sony Corporation Representative Patent Attorney Kodo Koike Sakae Tamura

Claims (1)

[Claims] a slide plate that is provided inside the housing so as to be movable in the front and rear directions through a front opening of the housing, is sent out through the front opening in an unloading operation, and is stored in the housing in a loading operation; A tone arm of a linear tracking type provided on a plate, a turntable provided on the slide plate on which a record is placed, and a turntable provided on the housing that can be raised and lowered to press the record against the turntable in a lowered state. a rotatable stabilizer, a position detecting means for detecting a position of the tone arm at which an unloading operation is performed without contact between the base of the tone arm and the stabilizer, and a position detecting means responsive to a signal detected by the position detecting means. and control means for starting an unloading operation of the slide plate.