WO2014168292A1

WO2014168292A1 - Upper thread clamp device of sewing machine

Info

Publication number: WO2014168292A1
Application number: PCT/KR2013/006083
Authority: WO
Inventors: 오영곤
Original assignee: Oh Younggon
Priority date: 2013-04-12
Filing date: 2013-07-09
Publication date: 2014-10-16

Abstract

The present invention relates to an upper thread clamp device of a sewing machine and, more particularly, to an upper thread clamp device which is installed in a sewing machine to clamp an upper thread, in order to achieve the purpose of clamping the end of the upper thread, which is automatically cut after one sewing work is completed, for the next sewing work, while performing sewing works using the sewing machine.

Description

Upper thread clamp device of sewing machine

The present invention relates to an upper thread clamp device of a sewing machine, and more particularly, when the sewing operation is performed using a sewing machine, the upper thread that is automatically delivered after one sewing operation is finished is clamped at the end of the upper thread for the next sewing operation. The present invention relates to an apparatus for clamping the upper thread is installed on the presser foot holder of the sewing machine.

Sewing machine (sewing machine, sewing machine) is a representative precision machine that is evolving with the development of technology. Such a sewing machine breaks down the wall of use restrictions in the material of the sewing object, and is becoming more diversified and specialized in its application.

Sewing machines are classified into various types according to driving means, uses, rotational speeds, etc., and are generally composed of an arm that forms an upper part and extends forward and backward, a bed which forms a lower part and extends forward and backward, and a column connecting the arm and the bed. It has a frame having an approximately "c" shape. The frame is usually provided with a driving means for moving the needle, a presser foot for pressing a sewing object (typically a fabric), a moving means for relatively moving the needle and the presser foot, and a drum mechanism (in a bed).

Meanwhile, the upper thread clamping device of the sewing machine functions to hold the end of the upper thread which is automatically cut after the sewing operation is completed for the next sewing operation.

The inventor has been researching and developing the upper thread clamping device of a sewing machine for a long time, Korean Patent Publication No. 10-0460792 "Upper Thread Clamp Device of Sewing Machine" and Korean Patent Publication No. 10-1031088 "Upper Thread of Sewing Machine" "Clamp device" has been proposed and registered.

In particular, the recently patented patent (10-1031088) can easily implement a clapping device even when using a narrow presser foot, to prevent waste of the sewing thread by keeping the upper thread as short as possible from the needle In the upper thread clamp device of a new type of sewing machine, which effectively prevents the upper thread from being detached from the needle, and effectively prevents the thread from entanglement of the sewing thread at the sewing start area generated at the start of sewing. It is about.

However, the patent invention has a complicated structure because the drive generating member must include three link units in order to change the linear movement of the actuator into the rotational movement by using an actuator such as a solenoid. It was true that the economic aspects were somewhat problematic, such as excessive production costs.

The present invention is to solve the above problems, the object of the present invention is to maintain the compatibility for various other presser foot which is an advantage of the present invention proposed by the present inventor, to keep the upper thread as short as possible, to prevent waste of sewing thread In addition, the upper thread effectively prevents the needle from being detached from the needle, and at the same time, the structure is simple and the number of parts is dramatically reduced, thereby providing a new type of upper thread clamping device of the sewing machine with simple assembly and economical. .

Another object of the present invention is that the user is used to replace the presser foot when sewing, it is easy to replace when replacing the presser foot, the ready-made presser foot can be used as it is the upper thread clamping device of the sewing machine does not incur additional costs To provide.

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

In order to achieve the above object, according to a preferred embodiment of the present invention, the upper thread clamping device of the sewing machine in which the presser foot holder and the needle holder are vertically disposed at one end of the arm body, is coupled to one side of the arm body. The motor 10 is installed, the motor shaft to rotate the rotation angle at a predetermined angle alternately left and right by the control signal of the control device; A rotation bar 20 coupled to the motor shaft to alternately rotate the rotation angle by a predetermined angle from side to side; The central shaft 32 having a bush is fixed to the base bracket 1 so that the upper and lower sides thereof can be symmetrically rotated with respect to the central axis, and U-shaped rings 34 having one side open at both ends are formed, respectively. The transmission bar 30 is coupled to the rotation bar to be rotatable to receive the rotational angular movement of the rotation bar, and the lower side is coupled to the rotation bar to be rotatable to transfer the rotation angular motion to the rotation shaft coupled to the coupling bar 30. ; A clamp block 40 fixed to the lower portion of the presser foot holder 64; A rotation shaft (41) rotatably inserted into the clamp block and receiving a rotation angle movement of the transmission bar from one side and transmitting a rotation angle movement to the holder pin to the other side; A holder pin (44) attached to the rotating shaft to receive the rotating angular movement of the rotating shaft and rotate alternately in rotation; A stopper pin (46) installed at each of the clamp blocks on the left and right about the pivot shaft, and having a stopper (47) at the end of which the upper thread is clamped by close contact with the holder pin; And a presser foot block 60 attached to or detached from a lower portion of the clamp block, and a presser foot formed under the clamp block.

According to a preferred embodiment, the upper side of the clamp block 40, the bolt 51, the cylindrical coil spring 55 formed on the lower portion of the bolt, is formed in the lower portion of the cylindrical coil spring, one side is inserted into the coil spring The other side includes a support 57 having a round surface and a ball 58 inserted into the lower portion of the support, wherein the pivot shaft 41 has a flat surface 41a having a cross section at a portion where the ball abuts. Is formed, and the ball presses the flat surface 41 of the rotational shaft so that the end of the holder pin is brought into close contact with the stopper.

According to a preferred embodiment, the stopper pin 46 can be disengaged by the bolts 48 in the clamp block and adjusts the spacing between the stoppers 47 by loosening or tightening the bolts.

According to a preferred embodiment, when the presser foot block is raised upward, the coupling bar is bent and formed in the vertical direction so that the coupling bar does not collide with the lower part of the arm.

As described above, the upper thread clamping device of the sewing machine of the present invention can keep the upper thread as short as possible from the needle to prevent waste of the sewing thread, and to secure the upper thread to prevent the upper thread from detaching from the needle, the upper thread is It remains longer than necessary to effectively prevent entanglement of the sewing thread at the start of sewing, as well as the structure of the upper thread clamping device, which is considerably simpler, easier to assemble, and smoothly to the driving force. It is designed to provide convenience and improve productivity.

In addition, the upper thread clamping device of the sewing machine of the present invention has a structure in which the clamping block is installed between the presser foot and the presser foot holder, and thus, the ready-made presser foot can be used as it is, thereby reducing the cost of replacing the presser foot.

1 is a perspective view for explaining the upper thread clamp device of a sewing machine according to a preferred embodiment of the present invention.

Figure 2 is a view for explaining the principle of operation of the holder pin of the upper thread clamp device of the sewing machine according to a preferred embodiment of the present invention.

Figure 3 is an exploded perspective view showing the structure of the rotating shaft inserted into the clamp block of the upper thread clamp device of the sewing machine, according to a preferred embodiment of the present invention.

Figure 4 is a schematic diagram for explaining the principle that the rotary shaft is pressed in the clamp block of the upper thread clamp device of the sewing machine according to another embodiment of the present invention.

The upper thread clamping device of the sewing machine in which the presser foot holder and the needle holder are vertically disposed at one end of the arm body is coupled to one side of the arm body, and the motor shaft is alternately left and right by the control signal of the control device. A motor 10 rotating angularly at a predetermined angle to the motor 10; A rotation bar 20 coupled to the motor shaft to alternately rotate the rotation angle by a predetermined angle from side to side; The central shaft 32 having a bush is fixed to the base bracket 1 so that the upper and lower sides thereof can be symmetrically rotated with respect to the central axis, and U-shaped rings 34 having one side open at both ends are formed, respectively. The transmission bar 30 is coupled to the rotation bar to be rotatable to receive the rotational angular movement of the rotation bar, and the lower side is coupled to the rotation bar to be rotatable to transfer the rotation angular motion to the rotation shaft coupled to the coupling bar 30. ; A clamp block 40 fixed to the lower portion of the presser foot holder 64; A rotation shaft (41) rotatably inserted into the clamp block and receiving a rotation angle movement of the transmission bar from one side and transmitting a rotation angle movement to the holder pin to the other side; A holder pin (44) attached to the rotating shaft to receive the rotating angular movement of the rotating shaft and rotate alternately in rotation; A stopper pin (46) installed at each of the clamp blocks on the left and right about the pivot shaft, and having a stopper (47) at the end of which the upper thread is clamped by close contact with the holder pin; And a presser foot block 60 attached to or detached from a lower portion of the clamp block, and a presser foot formed under the clamp block.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail with respect to the structure of the upper thread clamp device of the sewing machine of the present invention.

1 is a view for explaining the upper thread clamp device of the sewing machine according to a preferred embodiment of the present invention.

Referring to FIG. 1, the motor 10 will be attached to an arm (not shown) corresponding to the body of the sewing machine by the base bracket 1. Of course, the shape of the base bracket 1 will vary depending on the shape of the arm.

The upper thread clamp device of the sewing machine of the present invention is the presser foot block 60 and the presser foot by the driving force of the motor 10 alternately rotating the angular rotation alternately from side to side, that is, repeating the forward rotation and the reverse rotation at a predetermined angle. The holder pin 44, which is also coupled to the clamp block, is also in close contact with the stopper 47 coupled to the clamp block 40 fixed between the fixing members 64, thereby alternately holding the upper thread 80. . To this end, the rotational angular motion of the motor 10 is transmitted to the holder pin 44 via the rotation bar 20, the transmission bar 30, the rotation shaft 41.

The motor 10 is a part which generates a driving force. When the sewing work is finished once, the control device of the sewing machine receives a stop signal, and accordingly, the control device transmits a signal related to the rotational angular motion such as the rotation direction and the rotation angle of the motor 10 to the motor 10. Thus, the motor 10 rotates forward or reverse by a predetermined angle to perform rotational angular rotation alternately. The control device is set to adjust the rotation angle according to the type of presser foot.

Rotating bar 20 coupled to the motor shaft of the motor 10 is a part for rotating the angular rotation by a predetermined angle alternately left and right about the motor shaft. The bush is formed on the other side of the rotation bar 20 to reduce friction with the ring 34 of the transmission bar, and transmits rotational force to the transmission bar 30.

The elongated straight delivery bar 30 is a portion in which the upper and lower sides rotate symmetrically with respect to the central axis 32, and is coupled to the rotating bar 20 so as to be rotatable on the upper side to rotate the angular rotation of the rotating bar 20. Received, the lower side is coupled to be rotatable to the coupling bar 43 to transmit the rotational angular movement to the rotating shaft 41 to which the coupling bar 43 is coupled. When the upper side is rotated by a predetermined angle in the counterclockwise direction, the lower side is rotated by a certain angle in the clockwise direction.

The transmission bar 30 is fixed to the base bracket 1 so that the central shaft 32 in which the bush is formed is rotatable, and U-shaped rings 34 open at one end are formed at both ends, respectively, to transmit rotational angular motion. Will be delivered.

The transfer bar 30 alternately rotates the coupling bar 42 coupled to the lower side. The inner surface of the U-shaped ring preferably has a round shape such that the coupling bar 42 can smoothly rotate left and right without being caught by the inner surface of the ring (i.e., without interference of the ring).

The clamp block 40 is fixed to the lower portion of the presser foot holder 64. The rotating shaft 41 is inserted in the clamp block 40 so that rotation is possible. By tightening the bolts on both sides of the clamp block with respect to the presser foot holder, the clamp block is firmly fixed to the presser foot holder.

The rotation shaft 41 receives the rotation angle movement of the transmission bar by the coupling bar 43 and is coupled to the other side to transmit the rotation angle movement to the holder pin 44. Coupling bar 43 coupled to the rotating shaft 41 receives the rotation angle movement of the transmission bar, the rotating shaft 41 is rotated left and right as the coupling bar 43 rotates left and right.

The other end of the rotation shaft 41 is inserted into the holder pin 44. Holder pin 44 may be separated / fixed by a bolt (not shown) formed on the side. The holder pin 44 is also rotated alternately by the rotational angular movement of the rotation shaft 41, as the holder pin 44 alternately rotates to the left and right, the clamp block (from both sides around the holder pin) It is in close contact with the stopper 47 formed at the end of the stopper pin 46 fixed to 40.

That is, the holder pin 44 is rotated in the clockwise direction once to be in close contact with the stopper 47 on the right side, and the next time is rotated in the counterclockwise direction to be in close contact with the stopper 47 on the left side alternately left and right. As you move, you will hold the upper thread from the right side and the upper thread from the left side. As described above, the upper thread is clamped by the close contact between the end of the holder pin and the stopper 47 as the holder pin moves.

The adjustment of the spacing between the stoppers 47 is possible by the bolts 48 that fix the stopper pins 46 to the clamp block 40. That is, when the distance between the stoppers 47 at the ends of the stopper pins 46 is wide or narrow, the bolts 48 located on both sides of the clamp block 40 are released to freely move the stopper pins 46, At regular intervals, the bolt 48 is tightened again to secure the stopper 46. Thus, the adjustment of the spacing between the stoppers 47 will be possible by the bolts 48.

Meanwhile, referring to the drawing, the coupling bar 43 is not vertically erected, but is bent in a vertical direction, which is formed when the presser foot block 60 is raised to the upper side (arm side). Since there is a risk of colliding with the lower side of the arm located above the presser foot, the coupling bar 43 is bent in the vertical direction to prevent this.

The presser foot holder 64 is installed at one end of the arm body, and lifts or lowers the presser foot 62 as it moves up and down. When the sewing work is finished or when changing the cloth or replacing the presser foot, etc., the presser foot 62 is lifted up, and when the sewing operation is performed, the presser foot 62 is lowered to perform the work.

In the present invention, the pivot shaft 41, the stopper pin 46 with the stopper 47, and the holder pin 44 are all formed in the clamp block 40, the clamp block 40 is the presser foot holder 64 It is fixed to the lower portion of, and has a structure that the presser foot block 60 is fixed to the lower portion of the clamp block (40). That is, in the present invention, a holder pin or a stopper is not formed in the presser foot block, but a separate clamp block 40 is installed between the presser foot holder 64 and the presser foot block 60 to the clamp block 40. The holder pin 44 and the stopper pin 46 are coupled to each other, and the presser foot block 60 is coupled to the lower portion of the clamp block 40.

The stopper 63 formed at the end of the stopper pin 46 is a portion for clamping the upper thread 80 in close contact with the holder pin 44 that rotates in rotation. Although not shown, the inner surface of the stopper in close contact with the holder pin is formed of an elastic body such as silicone and rubber to block noise generation and to make the upper thread more stable by achieving a tighter contact.

Needle holder 74 to which the needle 70 is fixed is also installed side by side with the presser foot holder 64 at one end of the arm body. When sewing work needle holder 74 is moved up and down is made sewing work.

As such, the upper thread clamping device of the sewing machine of the present invention has a structure in which a clamping block is installed between the presser foot and the presser foot holder. Since the holder pin or the stopper is not formed on the presser foot block, it is possible to use the existing ready-made presser foot as it is, thereby reducing the cost of replacing the presser foot.

2 is a view for explaining the operation principle of the holder pin of the upper thread clamp device of the sewing machine according to a preferred embodiment of the present invention. As shown in FIG. 1, the rotational angular motion of the motor will be transmitted to the coupling bar through the transmission bar.

Here, referring to FIG. 2, the coupling bar 43 is coupled to the rotation shaft 41 rotatably inserted into the clamp block, so that the left and right rotation angle movements of the coupling bar 43 are the rotation shaft 41. Is delivered). Since the holder pin 44 is coupled to the other end of the rotation shaft 41, the rotational angular motion transmitted to the rotation shaft is also transmitted to the holder pin 44, so that the holder pin 44 also alternately rotates left and right. You will do angular exercise. In FIG. 2, the direction of rotational angular motion is illustrated by displaying arrows for clarity.

The pivot shaft 41 passes through the presser foot holder 64. For this purpose, a hole (not shown) is formed in the presser foot holder for the pivot shaft to pass therethrough.

The structure of the rotating shaft will be more easily understood through FIG. 3. Figure 3 is an exploded perspective view showing the structure of the rotating shaft inserted into the clamp block of the upper thread clamp device of the sewing machine according to a preferred embodiment of the present invention.

In order for the holder pin 44 to be in close contact with the left and right stoppers, a flat surface 41a having an “a” shape is formed at a portion of the pivot shaft 41. That is, the flat surface 41a formed at a predetermined portion of the rotational shaft 41 is formed at both sides at an angle of approximately 90 degrees.

First, referring to FIG. 2, the upper side of the clamp block 40 includes a bolt 51, a cylindrical coil spring 55 formed below the bolt, and a lower portion of the cylindrical coil spring, one side of which is inserted into the coil spring. The other side is formed with a support 57 having a round surface and a ball 58 formed under the support to stably support the ball.

That is, when the hexagonal nut or the like of the bolt 51 is tightened on the upper side of the clamp block 40, the cylindrical coil spring 55 under the bolt 51 presses the ball 58, and thus the ball 58. The flat surface 41a of the rotational shaft 41 is pressed, so that the rotational shaft 40 does not move easily, so that the position can be stably held from the fine movement due to external impact, inertia, or the like. Therefore, when the ball 58 presses the flat surface 4a1 of the rotational shaft 41, the tip of the holder pin and the stopper are brought into close contact.

Next, with reference to Figure 4 will be described the pressure applied to the rotating shaft by the ball. The state (a) of FIG. 4 is a state in which the ball 58 presses the flat surface 41a of one side of the rotation shaft 41 by the elasticity of the cylindrical coil spring. In this state, when the motor 10 (FIG. 1) is rotated at a predetermined angle in the opposite direction, the rotating shaft 41 to which the rotation driving force is transmitted is rotated in the direction of the arrow. At this time, the ball 58 As it is elastically supported by the cylindrical coil spring 55, as the rotation shaft 41 rotates, it temporarily rises upwards and then descends again by the elastic force of the spring 55, thereby becoming a state of FIG. 4 (b). . Even in the state of FIG. 4 (b), the pivot shaft 41 is in a state of pressing the flat surface 41a on the other side, so that the pivot shaft 41 can be stably positioned due to external impact, inertia, and the like. The end of the holder pin 44 coupled to the 41 and the stopper 47 are in close contact, thereby clamping the upper thread from the opposite side.

On the other hand, the stopper 47 in close contact with the holder pin is used an elastic rubber plate. The elastic rubber sheet is made of silicone or rubber.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

In the upper thread clamping device of the sewing machine in which the presser foot holder and the needle holder are vertically disposed at one end of the arm body,

A motor 10 coupled to one side of the arm body, the motor shaft rotating angle at a predetermined angle alternately left and right by a control signal of a control device;

A rotation bar 20 coupled to the motor shaft to alternately rotate the rotation angle by a predetermined angle from side to side;

The central shaft 32 having a bush is fixed to the base bracket 1 so that the upper and lower sides thereof can be symmetrically rotated with respect to the central axis, and U-shaped rings 34 having one side open at both ends are formed, respectively. The transmission bar 30 is coupled to the rotation bar to be rotatable to receive the rotational angular movement of the rotation bar, and the lower side is coupled to the rotation bar to be rotatable to transfer the rotation angular motion to the rotation shaft coupled to the coupling bar 30. ;

A clamp block 40 fixed to the lower portion of the presser foot holder 64;

A rotation shaft (41) rotatably inserted into the clamp block and receiving a rotation angle movement of the transmission bar from one side and transmitting a rotation angle movement to the holder pin to the other side;

A holder pin (44) attached to the rotating shaft to receive the rotating angular movement of the rotating shaft and rotate alternately in rotation;

A stopper pin (46) installed at each of the clamp blocks on the left and right about the pivot shaft, and having a stopper (47) at the end of which the upper thread is clamped by close contact with the holder pin; And

A presser foot block (60) detachably attached to the lower portion of the clamp block and having a presser foot formed at a lower portion thereof.
The method of claim 1,

On the upper side of the clamp block 40

Bolts (51),

Cylindrical coil spring 55 formed in the lower portion of the bolt,

Is formed in the lower portion of the cylindrical coil spring, one side is inserted into the coil spring, the other side the support 57 having a round surface,

It includes a ball 58 is inserted into the lower portion of the support,

The rotating shaft 41 is formed with a flat surface 41a having an a-shape cross section at a portion where the ball is in contact with the ball, and the ball presses the flat surface 41 of the rotating shaft so that the end of the holder pin and the Upper thread clamping device of the sewing machine, characterized in that the stopper is in close contact.
The method of claim 1,

The stopper pin 46 is detachable by a bolt 48 in the clamp block,

Upper thread clamping device of the sewing machine, characterized in that for adjusting the interval between the stopper (47) by loosening or tightening the bolt.
The method of claim 1,

When the presser foot block is raised upwards, the coupling bar is bent to form a vertical direction so that the coupling bar does not collide with the lower part of the arm.
In the upper thread clamping device of the sewing machine in which the presser foot holder and the needle holder are vertically disposed at one end of the arm body,

A motor 10 coupled to one side of the arm body, the motor shaft rotating angle at a predetermined angle alternately left and right by a control signal of a control device;

A clamp block 40 fixed to the lower part of the presser foot holder;

A rotation shaft 41 rotatably inserted into the clamp block and receiving a rotation angle movement of the motor from one side and transmitting a rotation angle movement to the holder pin to the other side;

A holder pin (44) attached to the rotating shaft to receive the rotating angular movement of the rotating shaft and rotate alternately in rotation;

Stopper pins 46 which are installed on the left and right clamp blocks around the pivot shaft, and stoppers 47 are installed at the ends to clamp the upper thread in close contact with the holder pins 44; And

A presser foot block (60) detachably attached to the lower portion of the clamp block and having a presser foot formed at a lower portion thereof.