CN111434598A

CN111434598A - Automatic winding device

Info

Publication number: CN111434598A
Application number: CN201910439182.5A
Authority: CN
Inventors: 池龙周; 张在伯; 姜廷昊; 韩俊熙
Original assignee: EM Tech Co Ltd
Current assignee: EM Tech Co Ltd
Priority date: 2019-01-11
Filing date: 2019-05-24
Publication date: 2020-07-21
Also published as: US20200223657A1; JP2020113963A; KR102128775B1; JP6785336B2

Abstract

The present invention is intended to provide an automatic winding device capable of solving a re-locking problem caused by unwinding a wire in a large amount when the automatic winding device is unlocked to re-wind the wire. According to the present invention, there is provided an automatic winding device including: a lower housing having a shaft, a spool rotatably disposed on the shaft, a wire wound around the spool, a spring having one end fixed to the shaft and the other end fixed to the spool to provide a rotational force to the spool, a track cover coupled to the spool to rotate together with the spool and having a track formed on the track cover, a pin structure positioned between the spool and the track cover and having a pin for controlling rotation of the spool, and a pin guide for guiding linear movement of the pin structure, wherein the rail cover includes an inner rail having a radius of curvature that increases and decreases in a circumferential direction, an outer rail spaced apart from the inner rail, a connecting rail for connecting the inner rail and the outer rail, and a stopper rail for connecting the inner rail and the outer rail, the stopper rail having a bent portion for stopping the pin, an end of the connecting rail near the outer rail being connected to the outer rail and the stopper rail.

Description

Automatic winding device

Technical Field

The present invention relates to an automatic winding device.

Background

Typically, a headset is a receiver designed to be small enough to be placed into the ear. With the popularity of smartphones, the time and opportunities to listen to music and watch videos using smartphones have increased, making it common to enjoy music, movies, and UCC using headphones on the move.

However, the wires of the headset often become entangled or tangled with other items in the bag, which results in a short circuit. In order to overcome the foregoing problems and increase user convenience, earphones or headphones having an automatic winding function have been developed and put to practical use.

Fig. 1 is an exploded view showing a conventional automatic winding device. In the conventional automatic winding device, various components of the automatic winding device are coupled to a lower housing 10 having a shaft 12 positioned at the lowermost side of the automatic winding device. Some components of the automatic winding device are rotatably coupled to the shaft 12, while other components are coupled to the shaft 12 in a rotationally fixed manner.

A spool 30 is rotatably disposed on the shaft 12 and the wire 20 is wound around the spool 30. A space for receiving the spring 40 is defined at an upper portion of the bobbin 30, and a space for receiving the

circuit portions

81, 82, 83 is defined at a lower portion of the bobbin 30.

The spring 40 is a coil spring. When unwinding the wire 20 from the spool 30, the spring 40 is compressed to store energy, and when the spring 40 is restored to the original state, such energy is used to rotate the spool 30 to rewind the wire 20.

The spring 40 is disposed in an upper space of the bobbin 30, and the rail cover 50 is disposed on the spring 40. A track is formed on a top surface of the track cover 50 such that the pin structure 60 moves along the track to control rotation of the spool 30.

The downwardly protruding pins of the pin structure 60 are inserted into the rails of the rail cover 50, and the upwardly protruding pins of the pin structure 60 are inserted into guide holes formed at the upper case 70. The track cover 50 performs only a rotational motion together with the spool 30, and the pin structure 60 performs a linear motion in a radial direction.

A terminal 81 connected to the wire 20, a PCB83 for electrical connection to the outside of the automatic winding device, and a brush 82 fixed to the wire side terminal 81 and making contact with the PCB83 to provide an electrical connection between the terminal 81 and the PCB83 are received at the lower portion of the bobbin 30.

Fig. 2 is a view showing the behavior of the rail cover when unwinding the wire of the conventional automatic winding device.

First, the rail formed on the rail cover 50 includes an inner rail 51 whose distance from the shaft in the circumferential direction is variable, an outer rail 52 spaced apart from the inner rail 51, a connecting rail 53 for connecting the inner rail 51 with the outer rail 52, and a stopper rail 54 for connecting the inner rail 51 with the outer rail 52, and the pin of the pin structure 60 is seated on the outer rail 52.

The outer rail 52 is formed in a generally circular shape in which the first spiral portion 52a has a radius of curvature that gradually decreases when the rail cover is rotated in the clockwise direction, and the second spiral portion 52b has a radius of curvature that gradually increases when the rail cover is rotated in the clockwise direction. The first spiral portion 52a is connected to the stopper rail 54 as the radius of curvature gradually decreases in the clockwise direction. The second spiral portion 52b is connected to the first spiral portion 52a as the radius of curvature gradually decreases in the counterclockwise direction. Accordingly, the pin of the pin structure 60, which moves from the inner rail 51 to the outer rail 52 via the connecting rail 53, continuously rotates in the counterclockwise direction along the second screw portion 52b, the first screw portion 52a and the circular section 52 c.

Fig. 3 is a view showing the behavior of the rail cover when the conventional automatic winding apparatus is locked.

When the track cover 50 is rotated in the counterclockwise direction, it appears that the non-rotating pin structure 60 is rotated in the clockwise direction with respect to the track cover 50. When the wire being unwound is released, the restoring force of the spring causes the rail cover 50 to rotate in a direction opposite to the unwinding direction, i.e., in a counterclockwise direction in the drawing. Subsequently, the pin of the pin structure 60 moves from the outer track 52 to the first spiral part 52a via the second spiral part 52b and the circular section 52 c. Since the first screw portion 52a has a radius of curvature that decreases during rotation in the counterclockwise direction (and increases during rotation in the clockwise direction), the pin structure 60 moves to the stopper rail 54 connected to the first screw portion 52a and stops on the stopper rail 54 as the radius of curvature of the first screw portion 52a tends to decrease.

Fig. 4 is a view showing a behavior of the rail cover when the wire is pulled in a case where the conventional automatic winding device is unlocked, and fig. 5 is a view showing a behavior of the rail cover when the wire is released in a case where the conventional automatic winding device is unlocked.

When the pin of the pin structure 60 stops on the stopper rail 54, if the wire is slightly pulled, the rail cover 50 rotates in a clockwise direction and the pin of the pin structure 60 enters the inner rail 51, and if the wire is released, the rail cover 50 continuously rotates in a counterclockwise direction and the wire is rewound around the spool 30.

However, when unlocking, if the wire is pulled long, the pin of the pin structure 60 moves from the inner rail 51 to the second screw portion 52b via the connecting rail 53 again. Here, if the wire is released, the pin of the pin structure 60 is locked on the stopper rail 54 again via the second screw part 52b, the circular section 52c and the first screw part 52a, as shown in fig. 3.

If the wire is pulled longer, the track cover 50 starts to rotate in the counterclockwise direction when the pin of the pin structure 60 is positioned on the first spiral portion 52a, or the track cover 50 starts to rotate in the counterclockwise direction when the pin of the pin structure 60 is positioned on the circular section 52 c. Likewise, the pins of the pin arrangement 60 are again locked on the stop tracks 54, as shown in fig. 3.

That is, when unlocked, if the wire is unwound in large quantities, the pins of the pin structure 60 leave the connecting track 53 and enter the outer track 52. In that case, the wire is not rewound but is relocked. To solve the re-locking problem, there is a physical step between the connecting track 53 and the outer track 52. However, if a strong unwinding of the wire over the step occurs, this step does not solve the re-locking problem and is worn out during the whole life.

Disclosure of Invention

An object of the present invention is to provide an automatic winding device capable of solving a re-locking problem caused by unwinding a wire in a large amount when the automatic winding device is unlocked to rewind the wire.

According to an aspect of the present invention to achieve the above object, there is provided an automatic winding device including: a lower housing having a shaft; a spool rotatably disposed on the shaft; a wire wound around a spool; a spring having one end fixed to the shaft and the other end fixed to the spool to provide a rotational force to the spool; a rail cover coupled to the spool to rotate together with the spool and having a rail formed thereon; a pin structure positioned between the spool and the track cover and having a pin for controlling rotation of the spool; and a pin guide for guiding a linear movement of the pin structure, wherein the rail cover includes an inner rail having a radius of curvature increasing and decreasing in a circumferential direction, an outer rail spaced apart from the inner rail, a connecting rail for connecting the inner rail and the outer rail, and a stopper rail for connecting the inner rail and the outer rail, the stopper rail having a bent portion for stopping the pin, an end of the connecting rail near the outer rail being connected to the outer rail and the stopper rail.

In some embodiments, the outer track may include a spiral portion having a radius of curvature gradually increasing in the first rotational direction, a circular section, and a connection portion for connecting an end of the circular section and an end of the spiral portion, and the outer end of the stopper track is connected to the connection portion.

In some embodiments, the inner track may have a radius of curvature that increases away from the central axis of rotation and decreases toward the central axis of rotation.

In some embodiments, the automatic winding device may further include a spring cover for covering a top surface of the spring, wherein the shaft includes a fixing groove formed in a circumferential direction in a position exposed to an upper portion of the spring, and the spring cover includes a hole formed with a diameter through which the shaft can pass and a hole formed with a diameter through which the fixing groove can be fixedly inserted, the holes overlapping each other.

In some embodiments, the pin guide may include an insertion hole into which an upper end of the shaft is inserted and a top end of the shaft is inserted into the pin guide to prevent the pin guide and the pin from rotating relative to the shaft.

According to the present invention, the automatic winding device is advantageous in that the automatic winding device can prevent re-locking regardless of how much wire a user unwinds when unlocking, which increases user convenience.

Drawings

Fig. 1 is an exploded view showing a conventional automatic winding device.

Fig. 4 is a view showing the behavior of the rail cover when the wire is pulled in the case of unlocking the conventional automatic winding device.

Fig. 5 is a view showing the behavior of the rail cover when releasing the wire in the case of unlocking the conventional automatic winding device.

Fig. 6 is an exploded view illustrating an automatic winding device according to an embodiment of the present invention.

Fig. 7 is a view illustrating a rail cover provided in an automatic winding device according to an embodiment of the present invention.

Fig. 8 is a view showing the behavior of the rail cover and the pin when the automatic winding device according to an embodiment of the present invention is locked.

Fig. 9 is a view showing the behavior of the rail cover and the pin when the automatic winding device according to an embodiment of the present invention is unlocked.

Detailed Description

Hereinafter, preferred embodiments of an automatic winding device according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 6 is an exploded view illustrating an automatic winding device according to an embodiment of the present invention. In the automatic winding device according to an embodiment of the present invention, each component of the automatic winding device is coupled to the lower case 100 having the shaft 120 positioned at the lowermost side of the automatic winding device. The shaft 120 may be separately formed and then coupled to the lower case 100, or the shaft 120 may be integrally formed with the lower case 100. Some components of the automatic winding device are rotatably coupled to the shaft 120, while other components are coupled to the shaft 120 in a rotationally fixed manner.

The spool 300 is rotatably disposed on the shaft 120, and a winding portion on which the wire 200 is wound is positioned at an intermediate portion of the spool 300. The wire 200 is wound around and received in the wound portion. Disc-shaped walls for receiving other components are arranged at the upper and lower portions of the coiled portion, the walls having a diameter larger than the diameter of the coiled portion. A spring 400, which will be discussed later, is received in the upper wall, and

circuit portions

810, 820, and 830 are received in the lower wall.

The spring 400 is a coil spring having an inner end fixed to the shaft 120 and an outer end fixed to the bobbin 300. The shaft 120 has a slit 122, and an inner end portion is fixedly inserted into the slit 122. When the wire 200 is unwound from the spool 300, the spring 400 is compressed to store energy, and when the spring 400 is restored to the original state, such energy is used to rotate the spool 300 to rewind the wire 200.

The spring cover 700 is disposed at an upper portion of the spring 400. A fixing hole 710 for fixing the shaft 120 is provided at the spring cover 700. The fixing groove 124 is formed along the circumference of the shaft 120, and after the inner end of the spring 400 is inserted into the slit 122, the fixing groove 124 is as high as the upper end of the spring 400. The fixing hole 710 includes: a hole formed in an eccentric position of the rotation center, the hole having a diameter such that the shaft 120 can pass through; and a hole formed at the rotation center, having a diameter such that the fixing groove 124 of the shaft 120 can be fitted into the hole, the holes overlapping each other.

A pin guide 650 for guiding the linear movement of the pin structure 600 is disposed at an upper portion of the spring cover 700. The pin structure 600 is formed in a quadrangular shape, and the pin structure 600 has an upwardly protruding pin 610 inserted into a rail formed on the rail cover 500. The pin guide 650 includes a rectangular bottom surface 651 and bent portions 652 bent upward at both sides to guide the pin structure 600 to move only linearly. In addition, a hole 653 is formed at the bottom surface 651, and the upper end of the shaft 120 is inserted into the hole 653. Thus, the pin guide 650 and pin structure 600 do not rotate relative to the shaft 120. Here, since the slot 122 is formed at the center of the shaft 120, the pin guide 650 may further include a bridge 654 crossing the center of the hole 653, such that the bridge 654 can be inserted into the slot 122. Accordingly, the contact area of the pin guide 650 with the shaft 120 is increased, which effectively distributes pressure to advantageously limit deformation of the upper end portion of the shaft 120.

The track cover 500 is coupled to an upper portion of the spool 300 to rotate together with the spool 300. A track is formed on an inner surface of the track cover 500 such that the pin 610 of the pin structure 600 is inserted into the track to control rotation of the track cover 500.

A terminal 810 connected to the wire 200, a PCB 830 for electrical connection to the outside of the automatic winding device, and a brush 820 fixed to the wire-side terminal 810 and making contact with the PCB 830 to provide electrical connection between the terminal 810 and the PCB 830 are received at a lower portion of the bobbin 300. Since the PCB 830 is fixed to the lower housing 120 and the terminal 810 is disposed at the bobbin 300 and rotated, the power connection is formed by the brush 820.

The rail cover 500 includes an inner rail 510 having a curvature radius that increases and decreases in a circumferential direction, an outer rail 520 spaced apart from the inner rail 510, a connecting rail 530 for connecting the inner rail 510 and the outer rail 520, and a stopper rail 540 for connecting the inner rail 510 and the outer rail 520, the stopper rail 540 having a bent portion for stopping the pin 610.

The inner track 510 has a radius of curvature that increases away from the center axis of rotation and decreases toward the center axis of rotation.

The outer rail 520 includes a spiral portion 522 having a radius of curvature that gradually increases as the rail cover 500 rotates in the direction of the unwinding line 200, a circular section 524, and a connection portion 526 for connecting an end of the circular section 524 with an end of the spiral portion 522 having a small radius of curvature.

The stopper track 540 is connected to a side of the screw portion 522 having a small radius of curvature. In the stopper rail 540, an outer stopper rail 542 connected to the outer rail 520 and an inner stopper rail 544 connected to the inner rail 510 are bent at different angles and connected to each other. Thus, the pin stops at the bend between the outer stop track 542 and the inner stop track 544.

The connecting track 530 connecting the inner track 510 and the outer track 520 is also connected to the stopper track 540, i.e., to the outer stopper track 542.

Fig. 8 is a view showing the behavior of the rail cover and the pin when the automatic winding device according to an embodiment of the present invention is locked. In fig. 8, the wire is unwound when the rail cover 500 is rotated in the counterclockwise direction, and the wire is rewound when the rail cover 500 is rotated in the clockwise direction.

When the wire 200 (see fig. 6) is unwound and then released, the rail cover 500 is rotated in a clockwise direction by the elastic force of the spring 400, so that the pin 610 (see fig. 6) formed on the pin structure 600 is rotated along the outer rail 520, reaches the spiral part 522, advances in a direction in which the radius of curvature is gradually reduced, and thus enters the stopper rail 540 instead of the connection part 526. Thus, the pin 610 stops on the stop track 540, which results in locking.

Fig. 9 is a view showing the behavior of the rail cover and the pin when the automatic winding device according to an embodiment of the present invention is unlocked. To unlock the automatic winding device, the wire 200 (see fig. 6) is unwound, which causes the track cover 500 to also rotate in the clockwise direction. The pins 610 (see fig. 6) of the pin structure 600 that stop on the stop tracks 540 move to the inner track 510 via the inner stop track 544. When the pin 610 is positioned on the inner rail 510, if the wire 200 is released, the rail cover 500 is rotated again in the clockwise direction, the pin 610 remains on the inner rail 510, and the rail cover 500 is continuously rotated to rewind the wire 200.

Even when the wire 200 is unwound until the pin 610 is positioned on the connection rail 530, if the wire 200 is released, the pin 610 remains on the inner rail 510 and the rail cover 500 continuously rotates to rewind the wire 200.

On the other hand, since the outer end portion of the connection rail 530 extends to the stopper rail 540, the connection rail 530 has a longer rail path. Therefore, in order to unwind the wire 200 such that the pin 610 is positioned on the outer track 520, the user should pull the wire 200 longer. Thus, upon unlocking, the user can reduce the likelihood of relocking caused by unwinding the wire 200 in large quantities.

Claims

1. An automatic winding device, comprising:

a lower housing having a shaft;

a spool rotatably disposed on the shaft and a line wound around the spool;

a spring having one end fixed to the shaft and the other end fixed to the spool to provide a rotational force to the spool;

a rail cover coupled to the spool to rotate together with the spool and having a rail formed thereon;

a pin structure positioned between the spool and the track cover and having a pin for controlling rotation of the spool; and

a pin guide for guiding linear movement of the pin structure,

wherein the rail cover includes: an inner track having a radius of curvature that increases and decreases in a circumferential direction; an outer rail spaced apart from the inner rail; a connecting rail for connecting the inner rail and the outer rail; a stopper rail for connecting the inner rail and the outer rail, the stopper rail having a bent portion for stopping the pin, an end of the connecting rail near the outer rail being connected to the outer rail and the stopper rail.

2. The automatic winding device according to claim 1, wherein the outer rail comprises: a helical portion having a radius of curvature that increases progressively in a first rotational direction; a circular section; and a connecting portion for connecting an end of the circular section and an end of the spiral portion, an outer end of the stopper rail being connected to the connecting portion.

3. The automatic winding device of claim 1, wherein the inner track has a radius of curvature that increases away from a central axis of rotation and decreases toward the central axis of rotation.

4. The automatic winding device according to claim 1, further comprising a spring cover for covering a top surface of the spring,

wherein the shaft includes a fixing groove formed in a position exposed to an upper portion of the spring in a circumferential direction, and the spring cover includes a fixing hole including a hole formed with a diameter enabling the shaft to pass therethrough and a hole formed with a diameter enabling the fixing groove to be fixedly inserted, the holes overlapping each other.

5. The automatic winding device according to claim 1, wherein the pin guide includes an insertion hole into which an upper end portion of the shaft is inserted and into which a top end portion of the shaft is inserted to prevent rotation of the pin guide and the pin structure and to restrict deformation of the top end portion of the shaft.

6. The automatic winding device according to claim 5, wherein the top end of the shaft has a slit, and a bridge intersecting the slit is formed at the insertion hole.