Record player

Abstract

The utility model relates to the technical field of record players, in particular to a record player, which comprises a base with a supporting shaft in the center and a turntable with a driven roller integrally formed at the bottom and a through hole in the center, a motor with a driving roller at the output end is further mounted on the base, and a belt is connected between the driving roller and the driven roller. The base supports the rotary table through a plane bearing, the plane bearing comprises a first ring body fixedly connected with the rotary table and a second ring body fixedly connected with the base, and friction between the first ring body and the second ring body is reduced through a plurality of balls which are arranged in the circumferential direction at uniform intervals; the rotating speed sensor is used for monitoring the rotating speed of the rotating disc, the output end of the rotating speed sensor is connected with the input end of the controller and used for providing rotating speed signals of the rotating disc for the controller, an alarm is further arranged on the controller, and the problem that the rotating disc shakes during playing due to abrasion between a traditional supporting shaft and the rotating disc can be solved through the arrangement of the plane bearing.

Description

Technical Field

[0001] This utility model relates to the field of record player technology, and in particular to a record player. Background Technology

[0002] The principle of a record player is that a record is placed on the record's platter and rotated by a motor. The stylus (usually a thin, pointed metal needle) is placed in the groove of the record and moves as the record rotates. Mechanical vibration converted into electrical signal: As the stylus moves along the groove, it experiences mechanical vibrations caused by changes in the shape and depth of the groove. These vibrations are then transmitted to a transducer (such as a magnetic head or piezoelectric crystal), which converts the mechanical vibrations into electrical signals. Signal amplification and playback: The converted electrical signal is sent to an amplifier for amplification, and the amplified signal is finally sent to a speaker. The speaker converts the electrical signal into sound waves, thus playing the sound. The existing technology has the problem that the existing turntable used to hold the record is supported by a support shaft. When the motor drives the turntable to rotate, wear occurs between the turntable and the support shaft. As the wear increases, the turntable will vibrate during rotation. At the same time, existing record players can run idle when no record is inserted, which can easily lead to stylus wear. In addition, the rotation speed of the existing turntable is basically achieved by controlling the speed of the motor, lacking a speed feedback device. Therefore, a record player needs to be designed to solve the above problems. Utility Model Content

[0003] This utility model provides a record player that uses a planar bearing structure to support the turntable from the base, solving the problem of vibration caused by wear in conventional record players. By using a thin-film pressure sensor, it can prevent the turntable from spinning freely when no record is inserted, thus avoiding wear on the cartridge. By using a speed sensor, it can achieve real-time feedback on the turntable speed.

[0004] The technical problem solved by this utility model is achieved by the following technical solution:

[0005] This utility model provides a record player, including a base with a support shaft at the center and a turntable with a driven roller integrally formed at the bottom and a perforation in the center. The base is also equipped with a motor with a drive roller at its output end. A belt connects the drive roller and the driven roller. The base supports the turntable through a planar bearing. The planar bearing includes a first ring fixedly connected to the turntable and a second ring fixedly connected to the base. The friction between the first ring and the second ring is reduced by multiple circumferentially spaced evenly spaced balls.

[0006] Preferably, the lower surface of the first ring body is provided with a first track that is adapted to the upper part of a plurality of balls, and the lower part of the plurality of balls is rotatably connected to the second ring body.

[0007] Preferably, the lower surface of the first ring body is provided with a first track adapted to the upper part of the plurality of balls, and the upper surface of the second ring body is provided with a second track adapted to the lower part of the plurality of balls. The plurality of balls are arranged circumferentially at equal intervals through a limiting frame, and the plurality of balls are in rolling contact with the limiting frame.

[0008] Preferably, a thin-film pressure sensor is fixedly connected between the second ring and the base. The thin-film pressure sensor is used to monitor the pressure applied by the second ring. The output end of the thin-film pressure sensor is connected to a controller to provide the controller with the pressure applied by the second ring to the thin-film pressure sensor. The output end of the controller is connected to a motor. When the controller determines that the pressure value applied to the thin-film pressure sensor has not reached the set value, the controller controls the motor to be in a locked state.

[0009] Preferably, the base is also provided with a speed sensor, which is used to monitor the rotation speed of the turntable. The output end of the speed sensor is connected to the input end of the controller to provide the controller with the rotation speed signal of the turntable. The controller is also provided with an alarm to issue an alarm when the rotation speed of the turntable is abnormal.

[0010] Preferably, the speed sensor is a Hall speed sensor, and the turntable has multiple through slots evenly spaced circumferentially. When the through slot is aligned with the detection end of the Hall speed sensor, the signal detected by the Hall speed sensor changes. The controller determines the current turntable speed based on the period of the signal change detected by the Hall speed sensor.

[0011] The beneficial effect of this utility model is that by setting a planar bearing, the problem of wear between the traditional support shaft and the turntable, which causes the turntable to shake during playback, can be solved.

[0012] By using a thin-film pressure sensor in conjunction with a controller, wear between the turntable and the stylus can be prevented when the turntable is not loaded with a record.

[0013] By setting up a speed sensor, when the speed sensor of the turntable malfunctions, the motor speed can be adjusted in a timely manner through speed feedback. If adjustment fails, the alarm can be activated promptly to provide a reminder. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 A three-dimensional structural schematic diagram provided for this utility model;

[0016] Figure 2 A schematic diagram of the prior art structure provided for this utility model;

[0017] Figure 3 This is a cross-sectional schematic diagram provided for this utility model;

[0018] Figure 4 This is a first-view schematic diagram of the disassembled structure of this utility model;

[0019] Figure 5 This is a second-view schematic diagram of the disassembled structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the first embodiment of the planar bearing of this utility model;

[0021] Figure 7 This is a schematic diagram of the second embodiment of the planar bearing of this utility model.

[0022] In the diagram, 1. Base; 2. Turntable; 201. Through groove; 3. Support shaft; 301. Support edge; 4. Driven roller; 5. Motor; 6. Driven roller; 7. Belt; 8. First ring body; 801. First track; 802. Second track; 9. Second ring body; 901. Ball bearing; 10. Thin-film pressure sensor; 11. Hall effect speed sensor; 12. Controller; 13. Record; 14. Cartridge; 15. Gasket; 16. Limiting frame; 17. Stylus. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0024] To enable those skilled in the art to understand the innovative aspects of this utility model, the prior art designed for this utility model is first described, with reference to... Figure 1 and Figure 2The existing record player 13 includes a base 1 and a turntable 2. A cartridge 14 is mounted on one side of the base 1, with a stylus 17 at the end of the cartridge 14. A pad 15 is laid on the upper surface of the turntable 2, and a record 13 is placed on the upper surface of the pad 15. When the turntable 2 rotates, it drives the record 13 to rotate synchronously. Friction occurs between the record 13 and the stylus 17 of the cartridge 14. The vibration of the stylus 17 is transmitted to the transducer (not shown in the figure) inside the cartridge 14 and converted into an electrical signal. After amplification, the signal is converted into sound waves and played through a speaker (not shown in the figure). The connection between the existing turntable 2 and the base 1 is... Specifically, a support shaft 3 is fixedly connected to the center of the base 1. A support edge 301 protrudes from the outer wall of the support shaft 3 along its own radial direction. A through hole is opened in the center of the turntable 2. The turntable 2 passes through the support shaft 3 and is stably supported by the support edge 301. The turntable 2 is driven by a motor 5. A driven roller 4 is provided on the lower surface of the turntable 2. The motor 5 is installed on the base 1. A drive roller is provided at the output end of the motor 5. The drive roller and the driven roller 4 are connected by a belt 7. When the motor 5 drives the turntable 2 to rotate, the turntable 2 maintains stable rotation under the action of the support shaft 3.

[0025] As can be seen from the existing technology, firstly, because the turntable 2 and the support edge 301 are constantly rotating relative to each other during rotation, the support edge 301 or the lower surface of the turntable 2 suffers severe wear, causing the turntable 2 to vibrate during rotation, resulting in noise or intermittent music playback from the record player 13. Secondly, the existing turntable 2 is controlled by the start and stop of the motor 5 when stationary or rotating. Even when no record 13 is inserted, the motor 5 can be started to rotate the turntable 2, which can easily lead to a dry start of the turntable 2, causing friction between the stylus 17 of the cartridge 14 and the turntable 2, resulting in wear of the stylus 17 of the cartridge 14. Thirdly, the existing turntable 2 lacks a speed feedback device, resulting in unstable speed control and failure to provide timely warnings in case of abnormal speed. Based on the above problems, this utility model adopts the following solution to address them.

[0026] This utility model provides a record player 13, which, based on the prior art, firstly modifies the support shaft 3 and adds a planar bearing between the turntable 2 and the base 1. Specifically, the support shaft 3 provided by this utility model does not have a support edge 301, and the turntable 2 is supported on the base 1 by the planar bearing. That is, the entire weight of the turntable 2 is supported only by the planar bearing, thereby avoiding the problem of vibration when playing the record 13 due to uneven wear on the upper surface of the traditional support edge 301. In order to enable those skilled in the art to understand the planar bearing structure of this utility model, this utility model provides the following two planar bearing structures.

[0027] The first structure of the planar bearing is as follows: the planar bearing comprises a first ring body 8, a second ring body 9, and balls 901. The first ring body 8 and the second ring body 9 are fixed to the turntable 2 and the base 1, respectively. In the structure of the first planar bearing, the balls 901 are rolledly connected to the first ring body 8 or the second ring body 9. The other ring body (the first ring body 8 or the second ring body 9) that is not connected to the balls 901 has a first track 801. The first track 801 is used to adapt to the balls 901. For example, the first track 801 is opened on the lower surface of the first ring body 8, and multiple balls 901 are rolledly connected to the upper surface of the second ring body 9. This reduces the contact wear between the turntable 2 and the base 1. That is, in the prior art, when the turntable 2 rotates, it is friction (sliding friction) between the turntable 2 and the support edge 301. However, after modification, the present invention combines rolling and sliding friction between the balls 901 and the track.

[0028] The second structure of the planar bearing is as follows: the planar bearing includes a first ring body 8 with a first track 801, a second ring body 9 with a second track 802, and a plurality of balls 901 arranged circumferentially at equal intervals by a limiting frame 16. In use, rolling friction and sliding friction occur between the balls 901 and the first track 801 and the second track 802.

[0029] Furthermore, to address the issue of wear on the stylus 17 caused by the existing turntable 2 being able to start even when unloaded, a thin-film pressure sensor 10 is fixedly connected between the second ring 9 and the base 1. The thin-film pressure sensor 10 monitors the pressure applied by the second ring 9. The output of the thin-film pressure sensor 10 is connected to a controller 12, which provides the controller 12 with the pressure applied by the second ring 9 to the thin-film pressure sensor 10. The output of the controller 12 is connected to the motor 5. When the controller 12 determines that the pressure applied to the thin-film pressure sensor 10 has not reached the set value, the controller 12 controls the motor 5 to be in a locked state. That is, when the record 13 is not placed on the turntable 2, the weight pressure detected by the thin-film pressure sensor 10 is relatively small. At this time, the controller 12 controls the motor 5 to be in a stationary state and cannot be started. When the record 13 is placed on the turntable 2, the controller 12 releases the locked state of the motor 5, and the operator can then control the start and stop of the motor 5 normally.

[0030] To accurately monitor and control the rotational speed of turntable 2, a speed sensor is installed on the base 1. The speed sensor monitors the rotational speed of turntable 2, and its output is connected to the input of controller 12 to provide the rotational speed signal of turntable 2. Controller 12 is also equipped with an alarm. When controller 12 detects an abnormal rotational speed of turntable 2, it controls the operation of motor 5 to adjust the speed. If adjustment fails, it promptly activates the alarm to issue an alert. In other words, when controller 12 controls motor 5 to rotate, the speed sensor provides feedback to controller 12, thus achieving closed-loop feedback control. This allows controller 12 to control the rotational speed of motor 5 more accurately. Furthermore, if wear on the bearings or belt 7 causes turntable 2 to fail to rotate synchronously with motor 5 (in which case the rotational speed of turntable 2 is lower than that of motor 5), the speed sensor feedback will also fail to provide accurate control of turntable 2's speed, triggering the alarm to issue an alert.

[0031] Furthermore, the aforementioned speed sensor, the Hall speed sensor 11, has multiple through slots 201 evenly spaced circumferentially on the turntable 2. When the through slots 201 are aligned with the detection end of the Hall speed sensor 11, the signal detected by the Hall speed sensor 11 changes. The controller 12 determines the current speed of the turntable 2 based on the period of the signal change detected by the Hall speed sensor 11. The principle of the Hall speed sensor 11 in monitoring speed has been applied in other fields, such as the flywheel speed monitoring of automobiles, which will not be elaborated here.

[0032] This invention, by modifying the existing record player 13, can reduce the wear and tear on the turntable 2 during rotation, and prevent the record player 13 from vibrating due to wear after a short period of use. By setting a thin-film pressure sensor 10, it can prevent the turntable 2 from spinning idly, which would cause wear on the stylus 17. In addition, by setting a speed sensor, it can achieve more precise control of the speed.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above-described embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A record player comprising a base (1) having a support shaft (3) in the center and a turntable (2) integrally formed with a driven roller (4) in the bottom and having a hole in the center, a motor (5) having a driving roller at the output end being installed on the base (1), a belt (7) being connected between the driving roller and the driven roller (4), characterized in that, The base (1) supports the rotating disc (2) through a pair of plane bearings, which include a first ring body (8) fixedly connected with the rotating disc (2) and a second ring body (9) fixedly connected with the base (1), and a plurality of evenly spaced and circumferentially arranged rolling balls (901) are arranged between the first ring body (8) and the second ring body (9) to reduce friction.

2. A record player as claimed in claim 1, characterized in that A first track (801) is formed in the lower surface of the first ring body (8) and is adapted to the upper portions of the rolling balls (901), and the lower portions of the rolling balls (901) are rollingly connected to the second ring body (9).

3. A record player as claimed in claim 1, characterized in that A first track (801) is formed in the lower surface of the first ring body (8) and is adapted to the upper portions of the rolling balls (901), and a second track (802) is formed in the upper surface of the second ring body (9) and is adapted to the lower portions of the rolling balls (901), the rolling balls (901) are arranged at equal intervals in the circumferential direction through the limiting frame (16), and the rolling balls (901) and the limiting frame (16) are in rolling contact.

4. A record player as claimed in claim 1, characterized in that A thin film pressure sensor (10) is fixedly connected between the second ring body (9) and the base (1), the thin film pressure sensor (10) is used for monitoring the pressure applied by the second ring body (9), an output end of the thin film pressure sensor (10) is connected with a controller (12), the controller (12) is used for providing the pressure applied by the second ring body (9) on the thin film pressure sensor (10) to the controller (12), and an output end of the controller (12) is connected with a motor (5), when the controller (12) judges that the pressure value applied on the thin film pressure sensor (10) does not reach a set value, the controller (12) controls the motor (5) to be in a locked state.

5. A record player as claimed in claim 4, characterized in that A rotating speed sensor is further arranged on the base (1), the rotating speed sensor is used for monitoring the rotating speed of the rotating disc (2), an output end of the rotating speed sensor is connected with an input end of the controller (12), the controller (12) is used for providing the rotating speed signal of the rotating disc (2) to the controller (12), an alarm is further arranged on the controller (12), when the controller (12) monitors that the rotating speed of the rotating disc (2) is abnormal, the controller (12) controls the motor (5) to run to adjust the rotating speed, and controls the alarm to give an alarm prompt in time after the adjustment is fruitless.

6. A record player as claimed in claim 2, characterized in that The rotating speed sensor is a Hall rotating speed sensor (11), a plurality of through grooves (201) are circumferentially and evenly formed on the rotating disc (2), when the through grooves (201) are aligned with the detection end of the Hall rotating speed sensor (11), the signal monitored by the Hall rotating speed sensor (11) changes, and the controller (12) judges the current rotating speed of the rotating disc (2) according to the period of the signal change detected by the Hall rotating speed sensor (11).

Images