KR101979864B1 - Detecting devices for the end of lower thread bobbin and control method thereof - Google Patents

Abstract

The present invention relates to a lower thread detection device and a control method thereof. More specifically, the present invention relates to a lower thread detection device capable of detecting and informing the time of lack and breakage of the lower thread, which is determined on the basis of the number of revolutions of an opener (20) and a bobbin (10) wound with the lower thread, by comprising a first sensor (31) and a second sensor (32) that respectively sense rotation of a disc-shaped side flange (13) provided at both ends of a bobbin (10) and rotation of an opener (20) interconnected with a pulley (P) of a sewing machine; and a control method thereof.

Description

Technical Field [0001] The present invention relates to a lower thread detection device and a control method thereof,

[0001] The present invention relates to a lower thread detection apparatus and a control method thereof, and more particularly to a lower thread detection apparatus and a control method thereof that accumulate the number of revolutions of a bobbin wound around a lower thread and the number of revolutions of an opener, And more particularly, to a lower thread detection apparatus and a control method thereof that can detect and inform the user of a break in the lower thread and an exhaust time of the lower thread in advance.

Generally, the lower thread is accommodated in a bobbin case and then housed in a hook, thereby being located at the lower end of the sewing machine. Therefore, the user can not see the amount of the bobbin thread wound around the bobbin during the operation of the sewing machine. As a result, there has been a problem that the bottom thread is exhausted during the sewing work, or the sewing thread can not be detected in the middle of the sewing thread, resulting in poor quality and rework.

In order to solve this problem, there is a need for a device that detects a situation in which only a small amount of residual material remains before the lower thread is completely exhausted, that is, a situation in which the thread remaining in the lower thread reaches the lower thread end point, A device for detecting whether the bobbin is rotating or not is proposed.

Conventional methods for detecting whether the thread remaining in the lower thread reaches the point of the lower thread and whether the lower thread is performing a rotary motion include 1) detecting conductive paint painted on the lower thread end, 2) Or 3) attaching a light reflective tape or a light polarizing reflective tape on a bobbin core on which the bobbin thread is wound to detect the reflection of externally irradiated light, 4) a bar code printing plate is attached on the bobbin core on which the lower thread is wound, thereby recognizing the bar code by reflection of the light irradiated from the outside, or 5) a bobbin rotation detection mark on the sidewall flange of the bobbin (6) Attach a bobbin rotation detection mark to the sidewall flange of the lower thread to check the rotation of the bobbin bobbin A type respectively.

As described above, various conventional methods of detecting the bottom thread bobbin residual thread reaching the bottom thread point and the rotation of the thread thread bobbin may cause problems in the existing manufacturing process of winding the thread in the lower thread, There are many problems such as difficulty in applying to the sewing machine, failure to detect the end point of the bottom thread at all, or the detection of the rotation motion of the bottom thread bobbin, which is necessary for detecting the situation that the thread in the bottom thread is cut off.

Korean Patent No. 10-1484020 (Jan. 13, 2015) discloses an apparatus for detecting the lower end of a sewing machine and a control method thereof.

As shown in FIG. 1, the prior art is a device for detecting the lower end of a lower thread installed at the lower end of a sewing machine and informing the outside of the lower thread, as shown in FIG. 1, A lower thread 10 painted in dark black or light silver to be distinguished from the color of the thread; An optical sensor (20) for sensing the amount of light reflected from the lower chamber (10); An ADC 25 for modulating the amount of light detected by the optical sensor 20 into a digital signal and transmitting the digital signal; (I) sequentially storing the digital signals inputted from the ADC 25 and state information S discriminating the state of the lower yarn 10 based on the sensing information I A central processing unit 30; An input unit 40 having a tact switch 41 for inputting input information such as a detection reference Y and an initialization command to the central processing unit 30; A display unit 45 including an LED 46 and a seventh segment 47 for displaying status information S generated by the central processing unit 30 and input information input from the input unit 40; An air valve (50) for blowing air to clean the surface of the optical sensor (20) when the sensed information (I) stored in the central processing unit (30) is below the sensing reference (Y); And an alarm unit 55 for informing the sensed information I stored in the central processing unit 30 as an alarm sound when the sensed information I is not continuously detected.

However, although the above-described prior art can correctly detect the lower thread end to inform the outside, there is a problem in that the unit price of the optical sensor 20 for measuring the amount of light reflected from the lower thread 10 is high and the manufacturing cost of the sewing machine is increased.

In addition, the above-described conventional technique has a problem that a device such as an air valve 50 for spraying air to clean the surface of the optical sensor 20 has to be installed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a bobbin, which has a circumferential type detection mark provided on a side flange of a bobbin and sensors for detecting rotation of an opener A lower thread detection device and a control method of the lower thread detection device that can stably detect and inform the lower thread consumption or breakage according to the rotation of the bobbin and the change of the number of rotation of the opener.

According to another aspect of the present invention, there is provided a lower thread detection apparatus for detecting the state of a lower thread disposed on a lower portion of a sliding plate of a sewing machine, the lower thread sensing apparatus comprising: a cylindrical rotary shaft; A bobbin having a disc-shaped side flange at both ends of the rotating shaft; An opener interlocked with the pulley so as to pass the upper thread of the sewing machine needle during up-and-down movement; A first sensor installed on a lower surface of a sliding plate provided on a work table of the sewing machine to sense rotation of the side flange and a second sensor spaced apart from the first sensor by a predetermined distance to detect rotation of the opener A sensor unit; A controller for cumulatively counting the rotations of the opener and the side flanges sensed by the sensor unit and calculating the lower thread detection information; A buzzer for generating an audible alarm according to a signal transmitted from the control unit; and a display informing unit having an LED for displaying a driving state of the sewing machine on the basis of the lower room sensing information,

The side flange is provided with a plurality of detection marks marked with two colors alternating with each other on the basis of the center of rotation of the bobbin. The lower thread detection information is calculated by comparing the cumulative number of rotations of the opener and the rotation speed of the bobbin .

Wherein the bobbin has a first region in which a bottom thread is wound between one side flange and a divider, a second region in which a bottom thread is wound between the other side flange and the divider, and a second region in the upper portion of the first region and the second region, And the lower thread storage unit including the third region is provided.

The control unit is provided with a count unit for cumulatively counting and managing detection signals of the first sensor and the second sensor, and a reset switch for inputting a command for initializing data of the count unit.

According to another aspect of the present invention, there is provided a method of controlling a bottom thread sensing apparatus for sensing a state of a bottom thread disposed at a lower portion of a sliding plate of a sewing machine, the method comprising: An initialization step of initializing the rotation speed of the bobbin and the number of rotations of the opener by pressing the initialization step; Wherein a first sensor mounted on a lower surface of the sliding plate senses rotation of a detection mark formed on a side flange of the bobbin and a second sensor spaced apart from the first sensor by a predetermined distance, A sensing step of sensing a rotation of the opener; Detecting a bobbin detection information by comparing the rotation speed of the bobbin sensed in the sensing step and the rotation number of the opener; A display step of indicating to the display informing unit that the number of revolutions of the bobbin and the number of revolutions of the opener are normal when the lower thread detection information is normal in the discriminating step; And an alarm step of transmitting, to the buzzer, a drive signal indicating an abnormal state in the control unit when the biboidal sensed information determined in the determining step is abnormal,

The determining step may include a bottom thread exhaustion determination step of determining that the bottom thread is exhausted when the rotational speed of the bobbin is reduced after the number of rotations of the opener is increased.

The alarming step may include a step of stopping the driving of the sewing machine while displaying the open state of the slip plate on the display notifying part when the sliding plate is opened.

Wherein the step of discriminating includes a bottom yarn break discrimination step of discriminating a break of the bottom yarn by sensing a state where the number of rotations of the bobbin is not increased or decreased when the number of rotations of the opener is increased.

The effect of the lower thread sensing apparatus and the control method thereof according to the present invention is as follows.

First, by detecting the change in the rotating speed of the bobbin, which changes according to the amount of the lower thread wound on the bobbin formed on the bobbin, and the rotating speed of the opener rotating at a predetermined speed, the amount of consumption of the lower thread is detected, It is possible to accurately detect the replacement timing and the breakage of the battery,

Second, since the detection mark is provided on the side flange of the bobbin on the basis of the center, the expensive image sensor can be replaced with a low-priced motion detection sensor to accurately detect the rotation of the bobbin,

Thirdly, based on the number of revolutions of the bobbin and the number of revolutions of the opener, the control unit of the lower thread detecting apparatus calculates the lower thread detection information (I) to determine an abnormal state, thereby quickly determining the remaining amount of the lower thread and the supply state of the lower thread In addition,

Fourth, since the first sensor senses the rotation of the bobbin and the rotation of the opener to the control unit, and the second sensor comprises the low-priced motion sensor, it is possible to more easily grasp the abnormal state of the lower thread, There is an effect that a device can be provided.

FIG. 1 is a block diagram of a bottom end sensing apparatus according to the prior art,
2 is a perspective view of a lower thread detecting apparatus according to the present invention,
3 is a front view of the lower thread detecting apparatus according to the present invention,
4 is a bobbin of the lower thread detecting apparatus according to the present invention,
5 is a view for explaining the operation of the bottom thread sensing apparatus according to the present invention,
6 is a view for explaining a control method of the lower thread detecting apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a lower thread detection apparatus and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 5, the lower thread detecting apparatus according to the present invention is a lower thread detecting apparatus for detecting a use state of a lower thread disposed at a lower portion of a sliding plate K of a sewing machine, and includes a cylindrical rotary shaft 11, , A bobbin (10) having a separator (12) extending in a centrifugal direction on the outermost periphery of the rotating shaft (11) and a disk - shaped side flange (13) at both ends of the rotating shaft (11); An opener 20 interlocked with the pulley P so as to pass the upper thread when the sewing machine needle moves vertically; A first sensor 31 installed on a lower surface of a slide plate K or a lid provided on a work table of the sewing machine to detect rotation of the side flange 13, A sensor unit 30 having a second sensor 32 for detecting the rotation of the opener 20; A controller 40 for cumulatively counting the rotations of the opener 20 and the side flange 13 sensed by the sensor 30 and computing the lower thread detection information I; A buzzer 51 for generating an audible alarm according to a signal transmitted from the control unit 40 and a display 52 having an LED 52 for displaying the driving state of the sewing machine on the basis of the lower- (50)

The side flange 13 is provided with a plurality of detection marks 13a marked with two colors interlaced and rotated with respect to the center of the bobbin 10 when the bobbin 10 rotates. As shown in FIGS. 4 to 5, the detection mark 13a is divided radially into white and black to detect the rotation speed and speed of the bobbin 10, The rotation angle per rotation of the bobbin 10 according to the detection of the detection mark 13a can be calculated. That is, by counting the number of the detection marks 13a, the rotation state of the bobbin 10 can be detected more accurately.

The lower thread detecting apparatus of the present invention is characterized in that the first sensor 31 (see FIG. 1) is attached to a cover or slider plate K that can detect the rotation of the bobbin 10 and the opener 20 according to the kind of the kiln, And the second sensor 32 can be mounted and utilized.

The lower thread detection information I is calculated by comparing the accumulated number of rotations of the opener 20 with the rotation speed of the bobbin 10. [ Here, the rotation speed of the bobbin 10 is calculated by accumulating the rotation number of the detection mark 13a over time.

The bobbin 10 is provided with a first region 10a in which a lower thread is wound between one side flange 13 and the divider 12 and a second side flange 13 between the other side flange 13 and the divider 12 A lower region storage compartment 15 composed of a second region 10b in which the lower thread is wound between the first region 10a and the second region 10b and a third region 10c in which the lower thread is wound on the upper portion of the first region 10a and the second region 10b Respectively. The lower thread wound on the lower thread storage unit 15 is loosely supplied from the third region 10c and the rotation speed of the bobbin 10 increases as the rotation speed of the bobbin 10 approaches the rotation axis 11. [ When the lower thread is supplied from one of the second region 10b or the first region 10b after the lower thread of the third region 10c is supplied and the bobbin 10 is moved to the last remaining lower thread, The rotational speed of the motor is reduced.

The control unit 40 includes a count unit 41 for cumulatively counting and managing detection signals of the first sensor 31 and the second sensor 32 and a control unit 40 for inputting a command for initializing the data of the count unit 41 It is possible to calculate the lower thread detection information I when the bobbin 10 and the opener 20 are rotated.

As shown in FIG. 6, the method of controlling the bottom thread sensing apparatus according to another embodiment of the present invention includes the steps of sensing the bottom thread wound on the bobbin 10, which is embedded in the lower portion of the slide plate K of the sewing machine, The method for controlling the sensing device according to claim 1, wherein the bobbin (10) is placed in the kiln (G) and then the reset switch (42) is pressed to initialize the number of revolutions of the bobbin (10) (S10); The first sensor 31 mounted on the lower surface of the sliding plate K senses the rotation of the detection mark 13a formed on the side flange 13 of the bobbin 10, A sensing step (S20) of sensing a rotation of the opener (20) which is rotated to the left and right so that the second sensor (32) spaced by a predetermined distance passes the needle of the sewing machine; A step (S30) of calculating and discriminating the lower thread detection information (I) comparing the rotation speed of the bobbin (10) sensed in the sensing step (S20) with the rotation number of the opener (20); A display step S40 for indicating to the display notifying part 50 that the number of revolutions of the bobbin 10 and the number of rotations of the opener 20 are normal when the upper thread detection information I is normal in the discriminating step S30 ; And an alarm step (S50) of informing the buzzer 51 of a driving signal informing the abnormal state in the controller 40 when the bottom piece detection information I determined in the discriminating step S30 is abnormal ,

In the determining step S30, a bottom yarn exhaustion discriminating step S31 for discriminating that the bottom yarn is exhausted is sensed when the rotation speed of the bobbin 10 is reduced after the rotation number of the opener 20 is increased do.

In the initialization step S10, the rotation number of the bobbin 10 stored in the counter 41 of the control unit 40 and the number of rotations of the bobbin 10, The number of rotations of the motor 20 is reset.

The sensing step S20 senses the rotation of the sensing mark 13a formed on the side flange 13 of the bobbin 10 through the first sensor 31 and the second sensor 32, 20 and transmits the detected rotation to the control unit 40.

Meanwhile, in the warning step S50, a stop step S51 for displaying the open state of the slid plate K at the time of opening of the slid plate K and stopping the driving of the sewing machine is provided, The state can be grasped. When the slide plate K is closed after the stop step S51, the control unit 40 returns to the initialization step S10 to initialize the counter unit 41 of the control unit 40. [

In the determining step S30, a bottom yarn break discriminating step S32 for discriminating the bottom yarn break is detected by detecting a state where the number of rotations of the bobbin 10 is not increased or decreased when the number of rotations of the opener 20 is increased So that the supply state of the lower thread wound on the bobbin 10 can be informed to the outside.

The operation of the lower thread detection apparatus and the control method of the present invention having the above-described configuration will be described below.

The lower thread detection apparatus according to the present invention detects the rotation of the detection mark 13a formed on the side flange 13 of the bobbin 10 and the rotation of the opener 20 by the sensor unit 30, ) Of the lower thread can be grasped in advance and the cut of the lower thread can be immediately judged.

That is, when the number of rotations of the opener 20 is continuously increased without rotating the bobbin 10, it is determined that the lower thread is broken, and it is judged that the rotation speed of the bobbin 10 is instantaneously decreased and then increased It is possible to inform the outside of the exhaustion time of the lower thread.

The bobbin 10 is provided with a first region 10a and a second region 10b on the left and right sides of the divider 12, The first region 10a and the second region 10b are provided with the third region 10c so that the lower region of the third region 10c is supplied first and then the first region 10a and the second region 10b ), The lower thread is sequentially supplied. At this time, when the lower thread of the first region 10a is supplied after the supply of the lower thread is completed in the second region 10b, the rotational speed of the bobbin 10 is temporarily reduced and then increased.

The controller 40, which senses the reduction of the rotation speed of the bobbin 10, informs the outside of the exhaustion of the lower thread that the user can stably replace the lower thread.

When the lower thread is replaced, the reset switch 42 provided in the control unit 40 is operated or the sliding plate K is opened to open the first sensor 31 and the second sensor 32 And the rotational speed of the bobbin 10 and the number of rotations of the opener 20 are initialized to set a state in which a new bottom yarn is supplied.

The method of controlling the bottom thread sensing apparatus according to another embodiment of the present invention includes the steps of supplying a bobbin 10 wound with a bottom thread to the bottom thread storage unit 15 and then pressing the reset switch 42, (S10) for initializing the rotational speed of the bobbin (10) and the number of rotations of the opener (20).

In the sensing step S20, the first sensor 31 senses the rotation of the sensing mark 13a formed on the side flange 13 of the bobbin 10, and the second sensor 32 interlocks with the pulley In the discrimination step S30, the lower thread detection information I is calculated by comparing the rotation speed of the bobbin 10 with the rotation number of the opener 20, It is determined whether it is abnormal. In the normal case, the display step S40 indicating normal state is abnormal, and the alarm step S50 is performed in which the buzzer 51 sounds to inform the outside.

In the determining step S30, a bottom yarn exhaustion discriminating step S31 for discriminating that the bottom yarn is exhausted when the rotation speed of the bobbin 10 is reduced after the number of rotations of the opener 20 is increased, The bottom yarn break detection step S32 is performed to detect the break of the bottom yarn by detecting the state where the number of revolutions of the bobbin 10 is not increased or decreased when the number of rotations of the opener 20 is increased. So that it can be informed to the outside.

In the warning step S50, a stopping step S51 for indicating the opened state of the sliding plate K and stopping the driving of the sewing machine is provided to the display notifying part 50 when the sliding plate K is opened Thus, abnormal operation of the sewing machine can be stably prevented.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
10: bobbin 10a: first region
10b: second region 10c: third region
11: rotating shaft 12:
13: side flange 13a: detection mark
15: Lower thread storage section
20: Opener 30: Sensor part
31: first sensor 32: second sensor
40: control unit 41:
42: reset switch 50: display notification unit
51: buzzer 52: LED
S10: Initialization step S20: Detection step
S30: discrimination step S31: step of discriminating the bottom thread exhaustion
S32: Sewing of bottom thread is determined S40: Display step
S50: Alarm step S51: Stop step
G: kiln I: perforation detection information K: slip plate
P: Pulley

Claims (6)

A lower thread detection apparatus for detecting the state of a lower thread disposed at a lower portion of a sliding plate (K) of a sewing machine,
A separating table 12 extending in the centrifugal direction at the center outer circumferential edge of the rotating shaft 11 and a disc-shaped side flange 13 at both ends of the rotating shaft 11, (10);
An opener 20 interlocked with the pulley P so as to pass the upper thread when the needle mounted on the sewing machine moves vertically;
A first sensor 31 installed on a lower surface of a sliding plate K provided on a work table of the sewing machine for sensing the rotation of the side flange 13, A sensor unit 30 having a second sensor 32 for detecting the rotation of the opener 20;
A controller 40 for cumulatively counting the rotations of the opener 20 and the side flange 13 sensed by the sensor 30 and computing the lower thread detection information I;
A buzzer 51 for generating an audible alarm according to a signal transmitted from the control unit 40 and a display 52 having an LED 52 for displaying the driving state of the sewing machine on the basis of the lower- (50)
The side flange 13 is provided with a plurality of detection marks 13a marked to rotate alternately with two colors based on the center of rotation of the bobbin 10,
Wherein the lower thread detection information (I) compares the accumulated number of rotations of the opener (20) with the rotation speed of the bobbin (10). The method according to claim 1,
The bobbin 10 is provided with a first region 10a in which a bottom thread is wound between one side flange 13 and the divider 12 and a second region 10b between the other side flange 13 and the divider 12 And a lower region storage compartment 15 composed of a second region 10b in which the lower thread is wound and a third region 10c in which the lower thread is wound on the upper portion of the first region 10a and the second region 10b Wherein the bobbin sensor is a bobbin. The method according to claim 1,
The control unit 40 includes a count unit 41 for cumulatively counting and managing detection signals of the first sensor 31 and the second sensor 32 and a control unit 40 for inputting a command for initializing the data of the count unit 41 And a reset switch (42) is provided to the lower thread detection device. A method of controlling a bottom thread sensing apparatus for sensing a state of a bottom thread arranged at a lower portion of a sliding plate (K) of a sewing machine,
An initializing step S10 for resetting the rotational speed of the bobbin 10 and the number of rotations of the opener 20 by pressing the reset switch 42 after placing the bobbin 10 wound on the bobbin 10 in the kiln G, ;
The first sensor 31 mounted on the lower surface of the sliding plate K senses the rotation of the detection mark 13a formed on the side flange 13 of the bobbin 10, A sensing step (S20) of sensing a rotation of the opener (20) which is rotated to the left and right so that the second sensor (32) spaced by a predetermined distance passes the needle of the sewing machine;
A step (S30) of calculating and discriminating the lower thread detection information (I) comparing the rotation speed of the bobbin (10) sensed in the sensing step (S20) with the rotation number of the opener (20);
A display step S40 for indicating to the display notifying part 50 that the number of revolutions of the bobbin 10 and the number of rotations of the opener 20 are normal when the upper thread detection information I is normal in the discriminating step S30 ;
If the upper thread detection information I determined in the discriminating step S30 is abnormal, the control unit 40 transmits a driving signal indicating an abnormal state and outputs an alarm to inform the outside through the buzzer 51 and the LED 52 Step S50;
In the determining step S30, a bottom yarn exhaustion discriminating step S31 for discriminating that the bottom yarn is exhausted is sensed when the rotation speed of the bobbin 10 is reduced after the rotation number of the opener 20 is increased Wherein the lower thread detection device comprises: 5. The method of claim 4,
The warning step S50 may include a stop step S51 for displaying the opened state of the sliding plate K and stopping the driving of the sewing machine to the display notifying part 50 when the sliding plate K is opened Characterized in that the bobbin detection device is a control device. 5. The method of claim 4,
In the discriminating step S30, a bottom yarn break discriminating step S32 is performed in which the rotation number of the bobbin 10 is not increased or decreased when the number of rotations of the opener 20 is detected, Characterized in that the bobbin detection device is a control device.

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