KR20150015559A - Thread holder control set in the sewing machine - Google Patents

Abstract

The present invention relates to a thread holder controller of a sewing machine, and the purpose of the present invention is to prevent the entanglement of a thread and the separation of a thread from a needle when a sewing work is initiated, by holding the thread connected to the needle. The present invention comprises: a first power unit for generating rotary power in response to an initiation control signal of a driving footplate disposed below the sewing machine, and losing the rotary power in response to a stop control signal of the driving footplate; a driving pulley connected to the first power unit and rotating to move a sewing needle above and below; a control button mounted on an outer circumferential surface of the driving pulley to be able to control a predetermined interval; a sensor attached on one side of a body frame of the sewing machine and sensing the position of the control button to convert the sensed result into a position signal; a second power unit which is turned on (ON) in response to the initiation control signal of the driving footplate and turned off (OFF) in response to the position signal of the sensor; a transmission bar connected to the second power unit, wherein upper and lower sides of the transmission bar are symmetrically moved based on the central axis; and a thread holder coupled with a lower end of the transmission bar, wherein the thread holder closely sticks to a thread and thus holds the thread when the second power unit is turned on (ON), and releases the held thread when the second power unit is turned off (OFF). Thus, the present invention can stably hold the thread through a simple structure, thereby preventing the entanglement of the thread and the separation of the thread from the needle, and can finely control the movement radius of the thread holder using the control button with a simple structure, thereby precisely controlling the holding time of the thread.

Description

Technical Field [0001] The present invention relates to a control apparatus for a needle thread of a sewing machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle thread catching control apparatus for a sewing machine, and more particularly, to a needle thread catching control apparatus for a needle thread catching control apparatus for a sewing machine, .

Sewing machine (sewing machine, sewing machine) is a representative precision machine evolving with the development of technology. Such a sewing machine breaks the wall of the use restriction even in the material of the sewing object, and its application is further diversified and specialized.

The sewing machine is divided into various forms according to the driving means, the application, the rotating speed, and the like. The sewing machine is composed of an arm that is generally formed as an upper portion and extends in the forward and backward directions, a bed extending downward in the forward and backward direction, and a column connecting the arm and the bed. And has a sewing machine body frame having a substantially "C" shape. In the sewing machine body frame, a driving means for moving the needle vertically, a presser for pressing the sewing object (typically, fabric), a moving means for relatively moving the needle and the presser foot, and a drum mechanism (in the bed).

On the other hand, there was a product related to the needle threading device of the sewing machine. However, the conventional product is not a thread holding device, but a wiper device for lifting the thread. When the wiper is operated, it often touches the needle and hammers the thread. Remove this thread take-up wiper, sew it, and cut the thread with hand scissors. Also, although a product developed using a sprayer has been proposed, it is not currently available because of various problems. Workplaces using a small number of sewing machines are also a problem with the compressor's capacity and the fact that factories that use many sewing machines are having a problem with compressor capacity. This conventional method failed to grasp the problem of pulling the yarn because it did not think that the yarn had to be caught and that the cut yarn was blown into the sprayer and wiped with the wiper.

On the other hand, the inventor of the present invention has developed a new concept of "needle bar thread threading device" of a new concept, but has not been widely commercialized because of its complicated structure and large number of malfunctions.

Particularly, it is necessary to control the time for holding the yarn by controlling the moving radius of the yarn guide according to the type of the product to be sewn, but the adjustment is not easy due to the complicated structure.

KR 20-0255767 Y1

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems derived from the prior art, and it is an object of the present invention to provide a yarn removing device which can easily and reliably hold a yarn, The present invention is to provide a needle thread catching control device of a sewing machine which can easily control the radius and adjust the holding time of the thread.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to an embodiment of the present invention, there is provided a sewing machine comprising: a first power unit which generates a rotational force by a start control signal of a drive pedal plate disposed at a lower portion of a sewing machine, and whose rotational force is canceled by a stop control signal of the drive pedal; ; A driving pulley connected to the first power unit and rotated to move the sewing machine needle up and down; An adjustment button mounted to be adjustable along a circumference of the drive pulley; A sensor unit attached to one side of the body frame of the sewing machine to detect the position of the control button and convert it into a position signal; A second power unit turned on by a start control signal of the drive pedal plate and turned off by a position signal of the sensor unit; A transfer bar connected to the second power unit and moving upward and downward symmetrically with respect to a central axis; And a thread holder coupled to a lower end of the transfer bar to hold the yarn in close contact with the yarn when the second power unit is turned ON and to place the yarn in close contact when the second power unit is OFF, The needle thread catching control device of the sewing machine.

According to another aspect of the present invention, there is provided a sewing machine comprising: a sewing machine; a sewing machine; a sewing machine; a sewing machine; a sewing machine; a sewing machine; A power section; A driving pulley connected to the first power unit and rotated to move the sewing machine needle up and down; An encoder connected to an internal rotation axis of the first power unit to detect a predetermined rotation angle and convert the rotation angle signal into a rotation angle signal; A second power section turned on by the start control signal of the drive pedestal and turned off by the rotation angle signal of the encoder; A transfer bar connected to the second power unit and moving upward and downward symmetrically with respect to a central axis; And a thread holder coupled to a lower end of the transfer bar to hold the yarn in close contact with the yarn when the second power unit is turned ON and to place the yarn in close contact when the second power unit is OFF, The needle thread catching control device of the sewing machine.

According to the needle thread catching and controlling apparatus of the sewing machine of the present invention, it is possible to stably hold the thread even with a simple structure, so that it is possible to prevent the thread tangling at the start of sewing and the separation of the thread from the needle have.

In addition, since the moving radius of the yarn guide can be finely controlled by using the simple structure control button, the yarn catching time can be precisely controlled.

1 is a perspective view showing a sewing machine to which a needle thread catching and controlling apparatus according to an embodiment of the present invention is applied,
FIG. 2 is a partially enlarged view for explaining part A in FIG. 1,
Fig. 3 is a partially enlarged view showing a state in which part B in Fig. 1 is seated,
Fig. 4 is a partially enlarged view showing a state in which part B in Fig. 1 does not hold the yarn,
5 is a conceptual diagram and a configuration diagram for explaining an encoder connected to the rotation axis of the first power section of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Brief Description of Drawings FIG. 1 is a block diagram of a computer system according to an embodiment of the present invention; FIG. 2 is a block diagram of a computer system according to an embodiment of the present invention; FIG.

As shown in FIGS. 1 to 4, the needle thread catching control apparatus of the sewing machine according to the embodiment of the present invention includes a first power unit 10 that is turned on / off by a control signal of a driving footrest, A driving pulley 20 connected to the first power unit 10 to rotate and an adjusting button 30 mounted along an outer circumferential surface of the driving pulley 20, A second power unit 50 which is turned on / off by the sensor foot 40 and the second power unit 50, And a thread catching part 70 which is coupled to the lower end of the transfer bar 60 to closely contact the yarn to be caught or released.

First, the first power unit 10 generates a rotational force by the start control signal of the drive pedal plate disposed at the lower portion of the sewing machine, and the rotational force is canceled by the stop control signal of the drive foot plate. That is, when the driver depresses the drive pedestal, a start control signal is generated and transmitted to the first power unit 10. If the pedal is not depressed, the stop control signal is generated and transmitted to the first power unit 10. Here, the stop control signal may not be a signal for actually stopping the operation of the first power unit 10, but may be a state in which the contact is turned off in a switch or a relay so that the start control signal is no longer transmitted.

Next, the driving pulley 20 is connected to the first power unit 10 and rotates to move the sewing machine needle 4 up and down. The driving pulley 20 is pulley-coupled to the first power unit 10 and rotates and extends in the axial direction to transmit power to move the needle 4 of the sewing machine while moving up and down.

Next, as shown in FIG. 2, the adjustment button 30 is mounted to be adjustable along the outer circumferential surface of the drive pulley 20 at regular intervals. The adjustment button 30 is used to adjust the time until the second power unit 50 is turned off when the second power unit 50 is turned on and when the drive pulley 20 rotates, The controller 40 detects the control button 30. At this time, assuming that the drive pulley 20 rotates in the illustrated arrow direction, as shown in FIG. 2- (b), when the adjustment button 30 is located at the? It takes a relatively long time for the sensor unit 40 to detect the adjustment button 30. Therefore, since the ON state of the second power unit, which will be described later, is maintained for a relatively long period of time, the holding time of the yarn catcher 70 is increased.

Next, the sensor unit 40 is attached to one side of the body frame of the sewing machine to detect the position of the control button 30 and convert it into a position signal. The sensor unit 40 is attached to the uppermost end of the body frame of the sewing machine. When the proximity sensor is used to detect the proximity of the control button 30 within a predetermined distance, the sensor unit 40 turns off the second power unit 50, .

Next, the second power section 50 is turned on by the start control signal of the drive pedestal and is turned off by the position signal of the sensor section 40. The second power unit 50 may be a solenoid or a forward / reverse motor type.

Next, the transmission bar 60 moves symmetrically with respect to the center shaft 66 as the second power unit 50 is turned on / off, The driving force of the second power unit 50 is transmitted to the transmission bar 60 via the driving bar 62. [ That is, when the upper side of the transmission bar 60 advances, the lower side moves backward, and when the upper side of the transmission bar 60 moves backward, the lower side moves forward. Here, the transfer bar 60 can adjust the movement distance of the thread take-up unit by changing the position of the center shaft 66. This is because the second power unit 50 using the control button 30 and the sensor unit 40 So that the range of the limit can be further expanded or the time for holding the yarn can be finely adjusted. That is, if the position of the central axis 66 is lowered, the movement distance of the thread catching portion 70 will be shortened. If the position of the central axis 66 is raised, the movement distance of the thread catching portion 70 is relatively increased do. Thus, when the position of the center shaft 66 is lowered, the time for holding the thread catcher 70 is increased. When the position of the center shaft 66 is raised, the time for the thread catcher 70 to catch the thread . Therefore, a person skilled in the art can appropriately select the position of the central shaft 66 according to the type of the product to be sewn.

The thread catching part 70 is coupled to the lower end of the transfer bar 60 so that when the second power receiving part 50 is turned ON, ) Is turned off, the closely seated yarn is placed. The thread catching portion 70 includes a moving body 72 inserted and formed at the lower end of the transfer bar 60 and a thread grip 76 inserted and fixed to the other side of the moving body 72. Here, the moving body 72 is a portion that transmits backward and forward reciprocating motion of the transfer bar 60 to the thread grip 76. The thread catcher 70 has a thread catcher body 74 fixed to the lower end of the body of the sewing machine body so that the thread catcher 76 is inserted into the thread catcher body 74 to move forward and backward It moves in conjunction. As the moving body 72 moves forward and backward, the thread catcher 76 closely contacts the thread catcher body 74 to catch the thread. At this time, a buffer made of silicone or rubber is formed on the outer surface of the thread body 74, that is, the portion of the thread body 76 that is in close contact with the thread grip 76, so that the thread can be held more stably.

When the second power unit 50 is turned ON, the thread catcher 70 is brought into close contact with the thread catcher body 74 to catch the thread, and the second power unit 50 The transmission bar 60 elastically supported by the spring 6 provided on the fixing bracket 9 is returned to its original position (as shown in FIG. 4) by elasticity, So that the thread is separated from the thread body 74 and the thread is placed thereon.

According to another embodiment of the present invention, the first power section 10, the drive pulley 20, the encoder, the second power section 50, the transfer bar 60, 70).

Here, the configuration except for the encoder is the same in the above-described embodiment, and a detailed description thereof will be omitted.

The encoder is configured to replace the control button 30 and the sensor unit 40 in the above-described embodiment. The encoder 30 is connected to the internal rotation shaft of the first power unit 10 to sense a predetermined rotation angle, And converts it into each signal.

5, the encoder includes a rotating body 11 having a plurality of detection protrusions 12 formed along the outer circumference at an inner side in a direction of the center of the constant interval at the outer circumference, A proximity sensor 13 which is provided in proximity to the detection protrusion 12 to detect the detection protrusion 12 by oscillating a high frequency and a signal detection circuit 13 which compares the signal detected by the proximity sensor 13 with a reference signal, A rectifying circuit (15) for rectifying the detection signal selected by the comparison circuit (14), and a comparator circuit (14) for determining and selecting which position the rectifying circuit And an output circuit 16 for outputting the converted signals. The encoder turns off the second power unit 50 as a rotation angle signal that is indirectly connected to the second power unit 50 directly or through a control unit (not shown) or the like. At this time, although it is possible to directly operate the encoder to set the rotation angle of the encoder, it is preferable to configure the encoder so that the user can easily operate the encoder while viewing the operation screen through a control unit or the like.

According to the present invention as described above, since the thread can be stably held even with a simple structure, it is possible to prevent threading at the start of sewing and disengagement of the thread from the needle. In addition, by using a simple structure control button, the moving radius of the yarn grip can be finely controlled, so that the yarn holding time can be precisely controlled.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the claims of the invention to be described below may be better understood. The embodiments described above are susceptible to various modifications and changes within the technical scope of the present invention by those skilled in the art. These various modifications and changes are also within the scope of the technical idea of the present invention and will be included in the claims of the present invention described below.

2: presser foot 3: presser foot
4: needle 5: thread
6: Spring 9: Retaining bracket
10: first power section 11: rotating body
12: detection protrusion 13: proximity sensor
14: comparison circuit 15: rectification circuit
16: Output circuit 20: Driving pulley
30: Adjustment button 40: Sensor part
50: second power section 60: transmission bar
62: drive bar 66: center axis
70: yarn catcher 72: moving body
74: the body of the seal body 76: the seal body

Claims (2)

A first power unit in which a rotational force is generated by a start control signal of a drive pedal plate disposed at a lower portion of the sewing machine and a rotational force is canceled by a stop control signal of the drive pedal;
A driving pulley connected to the first power unit and rotated to move the sewing machine needle up and down;
An adjustment button mounted to be adjustable along a circumferential direction of the drive pulley;
A sensor unit attached to one side of the body frame of the sewing machine to detect the position of the control button and convert the position of the control button into a position signal;
A second power unit turned on by a start control signal of the drive pedestal and turned off by a position signal of the sensor unit;
A transfer bar connected to the second power unit and moving upward and downward symmetrically with respect to a central axis; And
A yarn catcher coupled to a lower end of the transfer bar to hold the yarn in close contact with the yarn when the second power unit is turned ON and to place the yarn in close contact when the second power unit is OFF;
And a control unit for controlling the sewing machine. A first power unit in which a rotational force is generated by a start control signal of a drive pedal plate disposed at a lower portion of the sewing machine and a rotational force is canceled by a stop control signal of the drive pedal;
A driving pulley connected to the first power unit and rotated to move the sewing machine needle up and down;
An encoder connected to an internal rotation axis of the first power unit to detect a predetermined rotation angle and convert the rotation angle signal into a rotation angle signal;
A second power unit turned on by a start control signal of the stepping motor and turned off by a rotation angle signal of the encoder;
A transfer bar connected to the second power unit and moving upward and downward symmetrically with respect to a central axis; And
A yarn catcher coupled to a lower end of the transfer bar to hold the yarn in close contact with the yarn when the second power unit is turned ON and to place the yarn in close contact when the second power unit is OFF;
And a control unit for controlling the sewing machine.

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