Automatic tonearm lift device

Abstract

Automatic tonearm lifting device for use with a tonearm (92) of a turntable (9), comprising: a base seat (1) that can be mounted on the turntable (9); a drive mechanism (2) comprising a stepper motor (21) mounted on the base seat (1) and a rotary shaft assembly (22) coupled to the stepper motor (21), the rotary shaft assembly (22) having a rotary shaft section (223) coaxially coupled to the stepper motor (21) and having an end face (226) axially opposite the stepper motor (21), and an eccentric projection section (224) extending from the end face (226) such that the rotary shaft assembly (22) is rotated by the stepper motor (21) to rotate the eccentric projection section (224) about an axis (M) within a predetermined angular range; and an arm lifting mechanism (3) comprising a fixed sleeve (31) mounted on the base seat (1), a movable shaft (32) movably arranged within the fixed sleeve (31) in an up-down direction, and an arm support platform (33) connected to an upper end section of the movable shaft (32), wherein the movable shaft (32) movably rests against the eccentric projection section (224), wherein during the rotation of the rotating shaft assembly (22) the movable shaft (32) is moved by the eccentric projection section (224) in the up-down direction relative to the fixed sleeve (31) between a raised position and a lowered position, wherein the arm support platform (33) is higher in the raised position than the arm support platform (33) in the lowered position, wherein the arm support platform (33) supports and carries the tonearm (92) when the movable shaft (32) is in the raised position.

Description

[0001] The disclosure relates to an arm lifting device and, in particular, to an automatic tonearm lifting device for a record player.

[0002] To use a record player to play a record (hereinafter referred to as "the record"), the front free end of a tonearm is positioned on the record. As the record rotates, a stylus at the free end of the tonearm traces the grooves of the record and converts the physical patterns of the record into electrical signals that produce tones. These tones are amplified and played back through the loudspeaker, thus creating music based on the converted electrical signals.

[0003] To stop playback, or when the music has finished, the tonearm must be lifted from the record so that the stylus does not touch the record. Since the stylus is very delicate and fragile, it is important to raise and lower the tonearm smoothly and to avoid any idling of the drive motor or mechanical structure that drives the tonearm, which can shorten its lifespan.

[0004] Therefore, one objective of the disclosure is to provide an automatic tonearm lifting device that can overcome at least one of the disadvantages of the prior art.

[0005] According to the disclosure, the automatic tonearm lifting device for use with a turntable tonearm comprises a base, a drive mechanism, and an arm lifting mechanism. The base is designed to be mounted on the turntable. The drive mechanism comprises a stepper motor mounted on the base and a rotating shaft assembly coupled to the stepper motor. The rotating shaft assembly comprises a rotating shaft section coaxially coupled to the stepper motor, having an end face axially opposite the stepper motor, and an eccentric projection section extending from the end face such that the stepper motor rotates the rotating shaft assembly to rotate the eccentric projection section about an axis within a predetermined angular range.The arm lifting mechanism comprises a fixed sleeve mounted on the base seat, a movable shaft movably arranged within the fixed sleeve in an up-and-down direction, and an arm support platform connected to an upper end section of the movable shaft. The movable shaft movably abuts the eccentric projection section. During rotation of the rotating shaft assembly, the movable shaft is moved by the eccentric projection section in the up-and-down direction relative to the fixed sleeve between a raised position and a lowered position, with the arm support platform being higher in the raised position than in the lowered position. The arm support platform supports and carries the tonearm when the movable shaft is in the raised position.

[0006] The stepper motor and the eccentric projection section cause the movable shaft to move in an up-and-down direction between the lowered and raised positions during the rotation of the stepper motor and the rotating shaft assembly. Furthermore, because the stepper motor is preset within a predetermined angular range to rotate the eccentric projection section synchronously, wear and energy waste on the parts caused by motor idling can be prevented.

[0007] Further features and advantages of the disclosure will become clear in the following detailed description of the embodiment with reference to the accompanying drawings. It should be noted that various features may not be drawn to scale. Fig. Figure 1 is a perspective view showing a record player and an embodiment of an automatic tonearm lifting device according to the disclosure. Fig. Figure 2 is a fragmentary perspective view showing the embodiment that can be mounted on a playback housing of the record player. Fig. Figure 3 is a perspective exploded view of the embodiment. Fig. Figure 4 is a fragmentary sectional view illustrating the embodiment when an eccentric projection section is in a lowered state, a movable shaft is in a lowered position, and a first conducting plate and a second conducting plate of a preload arrangement are in a first state. Fig. Figure 5 is a fragmentary sectional view of the embodiment from a different angle. Fig. 6 is a fragmentary sectional view similar to Fig. 4, which shows that the eccentric projection section is in a lifting state, the movable shaft is in a raised position, and the first conducting plate and the second conducting plate of the preload arrangement are in a second state.

[0008] For the sake of clarity, it should be noted that spatially relative terms such as "above," "below," "upper," "lower," "up," "on," "over," "downward," "upward," and the like may be used throughout the entire revelation, referring to the features depicted in the drawings. The features may be oriented differently (e.g., rotated by 90 degrees or in other orientations), and the spatially relative terms used here may be interpreted accordingly.

[0009] In the Fig. 1 and Fig. Figure 2 is an embodiment of an automatic tonearm lifting device 10 according to the disclosure, which can be attached to and used with a record player 9. The record player 9 generally comprises a playback housing 91, a tonearm 92 rotatably mounted on the playback housing 91 and having a stylus 93 at its front free end, a turntable 94 rotatably mounted on the playback housing 91 to support and rotate a record (not shown, hereinafter referred to as "the record"), and a main control module 95 located in the playback housing 91. The main control module 95 communicates with the tonearm 92 and the turntable 94 and controls the rotation of the turntable 94 and the audio signal processing.

[0010] With reference to the Fig. 1, Fig. 3 and Fig. 4 The automatic tonearm lifting device 10 comprises a base seat 1 arranged in the playback housing 91, a drive mechanism 2 arranged on the base seat 1, an arm lifting mechanism 3 arranged on the base seat 1, an input module 5 arranged on the playback housing 91, a detection module 5 in signal communication with the main control module 95, and a control module 6 arranged in the playback housing 91. The control module 6 is in signal communication with the drive mechanism 2, the arm lifting mechanism 3, and the input module 5.

[0011] The base seat 1 comprises a first seat 11, which is mounted inside the playback housing 91, and a second seat 12, which is rigidly connected to a front face of the first seat 11. The first seat 11 has a first plate 111, which is arranged on the top of the playback housing 91, and a second plate 112, which extends downwards from the first plate 111. The second seat 12 comprises a hollow cylinder 121, which is provided with a first through-hole 122 extending through it along an axis (M).

[0012] As in the Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the drive mechanism 2 comprises a stepper motor 21 mounted on the first seat 11 and a rotary shaft assembly 22 coupled to the stepper motor 21. The stepper motor 21 is in signal communication with the control module 6 and has an output shaft 211 which is controlled to rotate either in a first direction of rotation (T1) or in a second direction of rotation (T2) opposite to the first direction of rotation (T1) (as shown in Figure 5). Fig. 4 and Fig. (Figure 6). The rotary shaft assembly 22 comprises a tubular shaft 221, which is coaxially coupled to the output shaft 211 of the stepper motor 21, and a rotary shaft 222, which engages with the tubular shaft 221 via splined connections. In this way, the stepper motor 21 is controlled to drive the rotation of the rotary shaft assembly 22 in a series of small and predetermined discrete angular steps.

[0013] Thus, the tubular shaft 221 and the rotary shaft 222 are rotated synchronously with the stepper motor 21. The rotary shaft assembly 22 can be rotated by 45 degrees by the stepper motor 21 without the need for additional gear and / or belt connection mechanisms between the rotary shaft assembly 22 and the stepper motor 21.

[0014] The rotating shaft 222 comprises a rotating shaft section 223 which engages with the tubular shaft 221 in splined connection in order to be coaxially coupled with the stepper motor 21, and which has an end surface 226 which is axially opposite the stepper motor 21, an eccentric projection section 224 which projects from the end surface 226, and an end section 225 which extends axially from the eccentric projection section 224 and axially opposite the rotating shaft section 223.

[0015] The rotating shaft section 223 has a cylindrical shape. The eccentric projection section 224 comprises a radially extending adjacent surface 227 and a radially extending stop surface 228 that intersects the adjacent surface 227 at an angle of no more than 90 degrees.

[0016] The end section 225 has a cylindrical shape and is formed integrally with the eccentric projection section 224, such that the rotating shaft section 223 and the end section 225 extend along the axis (M) and are aligned. The rotating shaft section 223, the eccentric projection section 224, and the end section 225 together form an engagement slot 229. In this embodiment, a projection of the eccentric projection section 224, in the direction of the axis (M), engages a projection of the rotating shaft section 223 and has a fan shape with one corner at a 90-degree angle. The eccentric projection section 224 and the engagement slot 229, in the direction of the axis (M), together form a circular shape (as shown in Figure 225). Fig. 4 shown).

[0017] With reference to the Fig. 4 and Fig. 6 the eccentric projection section 224 is during the rotation of the rotary shaft assembly 22 about the axis (M) relative to the base seat 1 between a lifting state (see Fig. 6) at a first height (H1) of the highest position relative to a lower edge of the first seat 11 and a lowering state (see Fig. 4) rotated to a second height (H2) of the highest position relative to the lower edge of the first seat 11. The first height (H1) is greater than the second height (H2).

[0018] In one embodiment, the rotating shaft assembly 22 is slowly rotated by 45 degrees each time, so that the eccentric projection section 224 is rotated by 45 degrees about the axis (M). In some embodiments, a discrete angular range of the stepper motor 21 is predetermined to rotate the rotating shaft assembly 22 synchronously, so that the eccentric projection section 224 is rotated about the axis (M) within a predetermined angular range. In some embodiments, the eccentric projection section 224 is rotated about the axis (M) by a predetermined angle in the range of 0 to 180 degrees. In some embodiments, the predetermined angle (α) by which the eccentric projection section 224 is rotated about the axis (M) ranges from 30 degrees to 90 degrees.In some embodiments, the stepper motor 21 drives the rotation of the rotary shaft arrangement 22 by an angle between 30 degrees and 60 degrees, so that the predetermined angle (α) by which the eccentric projection section 224 is rotated about the axis (M) is between 30 degrees and 60 degrees.

[0019] With reference to the Fig. 3, Fig. 4 to Fig. 5 the arm lifting mechanism 3 comprises an upright fixed sleeve 31 mounted on the base seat 1, a movable shaft 32 movably arranged inside the fixed sleeve 31 in an up-down direction, and an arm support platform 33 connected to an upper end section of the movable shaft 32.

[0020] The fixed sleeve 31 is securely arranged in the cylinder 121 of the second seat 12 by means of a fastening element 34 (e.g., a hexagonal nut). The fixed sleeve 31 has a second through-hole 311, which is aligned with the first through-hole 122 of the cylinder 121 along the axis (M). The rotating shaft section 223 and the end section 225 of the rotating shaft 222 are each rotatably inserted into the first through-hole 122 and the second through-hole 311, respectively, to position the rotating shaft 222 along the axis (M). The eccentric projection section 224 is arranged within the fixed sleeve 31, so that the movable shaft 32 rests movably against the eccentric projection section 224.

[0021] The movable shaft 32 comprises a shaft section 321, which is connected to the arm support platform 33 at one of its upper ends, and a stop section 322, which extends downwards from a lower end of the shaft section 321 and is opposite the arm support platform 33. The stop section 322 has the shape of an inverted L and comprises an engagement section 323, which extends downwards from the shaft section 321 to terminate at a stop surface 325, and an extension section 324, which extends downwards from the engagement section 323. The stop surface 325 faces downwards and rests movably against the adjacent surface 227 of the eccentric projection section 224. The extension section 324 has a stop surface 326, which is angularly spaced from the stop surface 325 and is opposite the stop surface 228 of the eccentric projection section 224.Thus, the stop section 322 is engaged with the eccentric projection section 224 and in the engagement slot 229.

[0022] The movable shaft 32 is movable in the up-down direction relative to the fixed sleeve 31 between a raised position and a lowered position. Specifically, when the eccentric projection section 224 is in the lowered position, the movable shaft 32 is in the lowered position. When the eccentric projection section 224 is in the raised position, the movable shaft 32 is in the raised position. The arm support platform 33 in the raised position is higher than the arm support platform 33 in the lowered position. The arm support platform 33 is used to support and carry the tonearm 92 (see Fig. 2) is used when the movable shaft 32 is in the raised position. When the movable shaft 32 is in the lowered position, the arm support platform 33 is spaced from and located below the tonearm 92.

[0023] The detection module 4 comprises a cam element 41 extending radially outward from the tubular shaft 221, and a preload assembly 42 mounted on the base seat 1 and connected to the main control module 95 via a signal. The cam element 41 is rotated by the stepper motor 21 and rotated synchronously with the eccentric projection section 224. The preload assembly 42 comprises a first conductive plate 421 and a second conductive plate 422, which are attached to the first rail 11.The first conductive plate 421 comprises an elongated conductive plate body 423, a first conductive projection 424 extending from the conductive plate body 423 towards the second conductive plate 422, and a preloading pressure projection 425 connected to an upper end of the conductive plate body 423 to press the first conductive plate 421 towards the second conductive plate 423 by a preload force, so that the preloading pressure projection 425 can releasably bear against the cam element 41. The second conductive plate 422 comprises an elongated conductive plate body 426 and a second conductive projection 427 extending from the conductive plate body 426 towards the first conductive plate 421. The second conductive projection 427 is in releasable contact with the first conductive projection 424 and is electrically connected to it.

[0024] With reference to the Fig. 4 and Fig. 6. The first conductive plate 421 and the second conductive plate 422 can be connected between a first state (see Fig. 4) and a second state (see Fig. 6) change. In the first state, the preloading pressure projection 425 is in spring-loaded stop engagement with the cam element 41, and the first conductive projection 424 is separated from the second conductive projection 427, so that the first conductive plate 421 is not electrically connected to the second conductive plate 422 to generate a first detection signal that is transmitted to the control module 6. In the second state, the first conductive plate 421 is released from the cam element 41, and the first conductive projection 424 is in contact engagement with the second conductive projection 427, so that the first conductive plate 421 is electrically connected to the second conductive plate 422 to generate a second detection signal that is transmitted to the control module 6.

[0025] In this way, the detection module 4 can detect a rotational state of the rotary shaft arrangement 22 of the drive mechanism 2 in order to distinguish between the first state (see Fig. 4) and the second state (see Fig. 6) to switch. When the eccentric projection section 224 is in the lowered state, the cam element 41 abuts and presses the first conductive plate 421 to move the sensing module 4 into the first state and generate the first sensing signal. When the eccentric projection section 224 is in the raised state, the cam element 41 is released from the first conductive plate 421 to move the sensing module 4 into the second state to generate the second sensing signal.

[0026] With reference to the Fig. 1 and Fig. 3. The input module 5 is in signal communication with the control module 6 and is attached to the playback housing 91 of the turntable 9. The input module 5 is capable of transmitting a control signal to the control module 6. The control module 6 is located on the playback housing 91 of the turntable 9 and is in signal communication with the main control module 95 of the turntable 9.

[0027] The control module 7 is activated by the control signal to control and actuate the stepper motor 21 to rotate the eccentric cam assembly 22 so that the stop section 226 is moved between the raised state and the lowered state.

[0028] With reference to the Fig. 1, Fig. 3, Fig. 4 and Fig. 6 The control module 6 is activated by the control signal to control and actuate the stepper motor 21 to move the eccentric projection section 224 out of the lifted position (with reference to Fig. 6) into the lowered state (with reference to Fig. 4) or to move from the lowered state to the raised state. In this embodiment, the control module 6 and the main control module 95 can be integrally integrated into a printed circuit board, and the control module 6 can be a controller or a processor. In other embodiments, the control module 7 and the main control module 95 can be located at different locations within the playback housing 91.

[0029] In particular, the control module 6 is activated upon receipt of the control signal and the first detection signal to control and actuate the output shaft 211 of the stepper motor 21 so that it rotates in the first direction of rotation (T1), which drives the eccentric projection section 224 to change from the lowered state to the raised state in order to move the movable shaft 32 from the lowered position to the raised position, thereby raising the tonearm 92 with the arm support platform 33. The control module 6 is activated upon receipt of the control signal and the second detection signal to control and actuate the output shaft 211 of the stepper motor 21 so that it rotates in the second direction of rotation (T2), which drives the eccentric projection section 224 to move the movable shaft 32 from the raised position to the lowered position, thereby lowering the tonearm 92 with the arm support platform 92.

[0030] On the other hand, when the stylus 93 of the tonearm 92 reaches the end of the groove (not shown) of the record, a stop signal is generated, indicating the end of the track, and transmitted to the main control module 95. The main control module 95 is activated by the stop signal and generates an activation signal, which is transmitted to the control module 6. Upon receiving an activation signal, the control module 6 is activated to control and actuate the stepper motor 21 so that it rotates in the first direction (T1) to drive the eccentric projection section 224 and move the movable shaft 32 from the lowered position to the raised position to lift the tonearm 92 on the arm support platform 33. In particular, a light sensor (not shown, e.g.,A photointerrupter is arranged on the turntable 9 to generate an automatic stop signal when the tonearm 92 reaches the end of the groove. This signal is received by the main control module 95 and is intended to be the stop signal. Subsequently, the activation signal is transmitted to the control module 6 to activate the rotation of the stepper motor 21.

[0031] During use, the eccentric projection section 224 is controlled so that it is in the lifting position (see Fig. 6), so that the movable shaft 32 is moved into the raised position. At this stage, the tonearm 92 can be placed on the armrest platform 33, spaced away from and positioned above the record. The detection module 4 is in its second state, ready to generate and transmit the second detection signal to the control module 6.

[0032] The input module 5 is then activated to generate the control signal. Upon receiving the control signal and the second detection signal, the control module 6 is activated to control and actuate the stepper motor 21. This motor rotates and drives the rotary shaft assembly 22, rotating the eccentric projection section 224 about the axis (M) within the predetermined angular range (A). This movement allows the eccentric projection section 224 to move relative to the base seat 1 into the lowered position, thus moving the movable shaft 32 from the raised position to the lowered position. In this way, the stylus 93 of the tonearm 92 can strike the grooves of the record and transmit a signal to the main control module 95, which is converted into an analog audio signal that is amplified and then played back via a loudspeaker.At this stage, during the rotation of the rotating shaft assembly 22, the cam element 41 of the sensing module 4 is brought into the first state in which the sensing module 4 generates the first sensing signal, which is transmitted to the control module 6, and the control module 6 analyzes and determines that the movable shaft 32 is in the lowered position, and records the lowered position.

[0033] When the main control module 95 receives a stop signal, generated by the stylus 93 of the tonearm 92 reaching the end of the record groove, the activation signal is generated and transmitted to the control module 6. Upon receiving the activation signal and the first detection signal, the control module 6 is activated to control and actuate the rotation of the stepper motor 21, moving the eccentric projection section 224 into the raised position, thus moving the movable shaft 32 into the raised position. In this way, the tonearm 92 is raised to move away from the record. At this stage, the detection module 4 transmits the second detection signal to the control module 6, which analyzes and determines that the movable shaft 32 is in the raised position and records this.In some embodiments, the record player can be designed such that, when the record player is switched on, the control module 6 controls the movable shaft 32 so that it is in the lowered position, which is an "initial zero position," and that the control module 6 records this position. Once the movable shaft 32 is in the initial zero position, it can be controlled to the raised position to protect the record needle 93.

[0034] Furthermore, the input module 5 can be manually operated during record playback to stop the music. With the control signal and the initial detection signal transmitted to the control module 6, the control module 6 is activated to control and actuate the rotation of the stepper motor 21 to move the eccentric projection section 224 into the raised position, thus raising the movable shaft 32 to lift the tonearm 92 and move the stylus 93 away from the record to stop the music.

[0035] Since the rotation angle of the stepper motor 21 can be set to 45 degrees and the rotary shaft assembly 22 rotates synchronously with the stepper motor 21, additional gear and / or belt connection mechanisms for the automatic tonearm lift device 10 are not required, and the movable shaft 32 can be raised and lowered slowly. Because the movable shaft 32 is moved in the up-down direction by rotating the eccentric projection section 224 of the rotary shaft assembly 22, and the eccentric projection section 224 rotates synchronously with the stepper motor 21, wear and energy waste on parts caused by the idling of a conventional motor are prevented. Furthermore, when the cam element 41 of the sensing module 4 rotates with the eccentric projection section 224, the sensing module 4 can detect the state of the eccentric projection section 224.The pre-tensioning assembly 42 of the detection module 4 allows the second detection signal and the first detection signal to be generated during the switching on of the detection module 4.

[0036] As shown, with the stepper motor 21 and the eccentric projection section 224, the eccentric projection section 224 is rotatable during the rotation of the stepper motor 21 and the rotating shaft assembly 22 between the raised state at the first height (H1) and the lowered state at the second height (H2) in order to move the movable shaft 32 between the lowered and raised positions. Since the stepper motor 21 is preset within a predetermined angular range to rotate the eccentric projection section 224 synchronously, wear and energy waste on the parts caused by motor idling can be prevented. The sensing module 4 can accurately detect the state of the eccentric projection section 224 and generate the first and second detection signals.

Claims

[1] Automatic tonearm lifting device for use with a tonearm (92) of a record player (9), comprising: a base seat (1) that can be mounted on the turntable (9); a drive mechanism (2) comprising a stepper motor (21) mounted on the base seat (1) and a rotary shaft assembly (22) coupled to the stepper motor (21), the rotary shaft assembly (22) having a rotary shaft section (223) coaxially coupled to the stepper motor (21) and having an end face (226) axially opposite the stepper motor (21), and an eccentric projection section (224) extending from the end face (226) such that the rotary shaft assembly (22) is rotated by the stepper motor (21) to rotate the eccentric projection section (224) about an axis (M) within a predetermined angular range; and an arm lifting mechanism (3) comprising a fixed sleeve (31) mounted on the base seat (1), a movable shaft (32) movably arranged within the fixed sleeve (31) in an up-down direction, and an arm support platform (33) connected to an upper end section of the movable shaft (32), wherein the movable shaft (32) movably rests against the eccentric projection section (224), wherein during the rotation of the rotating shaft assembly (22) the movable shaft (32) is moved by the eccentric projection section (224) in the up-down direction relative to the fixed sleeve (31) between a raised position and a lowered position, wherein the arm support platform (33) is higher in the raised position than the arm support platform (33) in the lowered position, wherein the arm support platform (33) supports and carries the tonearm (92) when the movable shaft (32) is in the raised position. [2] Automatic tonearm lifting device according to claim 1, further comprising a detection module (4) and a control module (6), wherein the detection module (4) is in signal communication with the control module (6) and is attached to the base seat (1), wherein the detection module (4) detects a rotational state of the rotating shaft assembly (22) in order to switch between a first state and a second state, wherein the rotating shaft assembly (4) in the first state generates a first detection signal and transmits the first detection signal to the control module (6), and the rotating shaft assembly (4) in the second state generates a second detection signal and transmits the second detection signal to the control module (6). [3] Automatic tonearm lifting device according to claim 2, wherein during the rotation of the rotating shaft assembly (22) the eccentric projection section (224) is displaced relative to the base seat (1) between a raised state at a first height (H1) and a lowered state at a second height (H2), wherein the first height (H1) is greater than the second height (H2) in order to move the movable shaft (32) in the up-down direction relative to the fixed sleeve (31) between the raised position and the lowered position, wherein the eccentric projection section (224) is rotated about the axis (M) by a predetermined angle in the range of 0 to 180 degrees. [4] Automatic tonearm lifting device according to claim 3, wherein the movable shaft (32) of the arm lifting mechanism (3) has a shaft section (321) connected to the arm support platform (33) and a stop section (322) extending downwards from a lower end of the shaft section (321) and opposite the arm support platform (33), wherein the stop section (322) has a stop surface (325) directed downwards to movably bear against the eccentric projection section (224). [5] Automatic tonearm lifting device according to claim 4, wherein the eccentric projection section (224) of the rotating shaft arrangement (22) has an adjacent surface (227) extending radially so that the stop surface (325) can bear against it, and a stop surface (228) extending radially and intersecting the adjacent surface (227) at an included angle not exceeding 90 degrees, wherein the predetermined angle by which the eccentric projection section (224) is rotated about the axis (M) is in the range of 30 degrees to 90 degrees. [6] Automatic tonearm lifting device according to claim 5, wherein the rotating shaft assembly (22) further comprises an end section (225) extending axially from the eccentric projection section (224) and opposite the rotating shaft section (223), wherein the rotating shaft section (223), the eccentric projection section (224) and the end section (225) cooperatingly define an engagement slot (229) for movable engagement with the stop section (322) of the movable shaft (32) therein, and the stop section (322) further comprises an engagement section (323) extending downwards from the shaft section (321) to terminate at the stop surface (325), and an extension section (324) extending downwards from the engagement section (323) and comprising a stop surface (326) that is angularly spaced from the stop surface (325) and the stop surface (228) of the opposite the eccentric protrusion section (224). [7] Automatic tonearm lifting device according to claim 3, wherein the detection module (4) includes a cam element (41) connected to the drive mechanism (2) and rotated by the stepper motor (21), and a bias arrangement (42) comprising a first conductive plate (421) and a second conductive plate (422) attached to the base seat (1), wherein the first conductive plate (421) is pressed towards the second conductive plate (422) by a bias force and is releasably in contact with the cam element (41), and wherein the first conductive plate (421) and the second conductive plate (422) are separated between the first state in which the first conductive plate (421) is in resilient engagement with the cam element (41) and in which the first conductive plate (421) is not electrically connected to the second conductive plate (422) to generate the first detection signal and the second state,in which the first conductive plate (421) is detached from the cam element (41) and in which the first conductive plate (421) is electrically connected to the second conductive plate (422) to generate the second detection signal. [8] Automatic tonearm lifting device according to claim 7, wherein the cam element (41) is rotated synchronously with the rotating shaft assembly (22), such that when the eccentric projection section (224) is in the lowering state to bring the movable shaft (32) into the lowered position, the first conductive plate (421) is in elastically abutting engagement with the cam element (41) to be in the first state, and when the eccentric projection section (224) is in the lifting state to bring the movable shaft (32) into the raised position, the first conductive plate (421) is released from the cam element (41) to be in the second state. [9] Automatic tonearm lifting device according to claim 8, further comprising an input module (5) which is in signal communication with the control module (6), wherein the input module (5) is operable to transmit a control signal to the control module (6), and the control module (6) is activated by the control signal to control and actuate the stepper motor (21) to rotate the eccentric projection section (224) in order to move the eccentric projection section (224) between the lifting state and the lowering state. [10] Automatic tonearm lifting device according to claim 9, wherein the control module (6) is activated upon receipt of the control signal and the first detection signal to control and actuate an output shaft (211) of the stepper motor (21) such that it rotates in a first direction of rotation (T1), which drives a rotation of the eccentric projection section (224) to move the movable shaft (32) from the lowered position to the raised position, and the control module (6) is activated upon receipt of the control signal and the second detection signal to control and actuate the output shaft (211) of the stepper motor (21) such that it rotates in a second direction of rotation (T2) opposite to the first direction of rotation (T1), which drives the rotation of the eccentric projection section (224) to move the movable shaft (32) from the raised position to the lowered position. [11] Automatic tonearm lifting device according to claim 9, which is further suitable for use with a main control module (95) of the turntable (9), wherein the control module (6) is suitable for being in signal communication with the main control module (95) so that the control module (6) is activated upon receiving an activation signal which is generated and transmitted by the main control module (95) when the main control module (95) receives a stop signal in order to control and actuate the stepper motor (21) so that it rotates in a first direction of rotation (T1) to drive the rotation of the eccentric projection section (224) in order to move the movable shaft (32) from the lowered position to the raised position. [12] Automatic tonearm lifting device according to claim 2, wherein the stepper motor (21) of the drive mechanism (2) is in signal communication with the control module (6) and is activated by the control module (6), wherein the stepper motor (21) drives the rotation of the rotary shaft arrangement (22) by an angle in the range of 30 degrees to 60 degrees.

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