KR101031088B1

KR101031088B1 - Upper thread holding apparatus for sewing machine

Info

Publication number: KR101031088B1
Application number: KR1020080116531A
Authority: KR
Inventors: 오영곤
Original assignee: 오영곤
Priority date: 2008-11-22
Filing date: 2008-11-22
Publication date: 2011-04-26
Also published as: KR20100057739A; WO2010058939A2; WO2010058939A3

Abstract

In the present invention, after the sewing operation is completed, the upper thread which is automatically cut is clamped at the end for the next sewing operation, so that even when using presser feet of different widths, it is compatible with, and in particular using a narrow presser foot In this case, the upper thread can be clamped effectively, keeping the upper thread as short as possible from the needle to prevent waste of the sewing thread, effectively preventing the upper thread from detaching from the needle, and leaving the upper thread longer than necessary to start sewing. It provides an upper thread clamping device of the sewing machine that can effectively prevent entanglement of the sewing thread generated at the start of sewing. In the present invention as described above, the presser foot holder 62 and the needle holder 6 are vertically disposed at one end of the arm 1, and the presser foot is formed by the presser foot block 60 so as to be movable up and down on the presser foot holder 62. In the upper thread clamping device of the sewing machine having the presser foot 63 coupled to the fixing stand 62, the driving force generating member 2 and the presser foot 63 which are operated by the control of the sewing machine's control device are installed. 6 has a pair of stoppers 70 spaced apart from each other such that the needles 7 coupled to each other are positioned therebetween, and holding lugs 51 positioned between the stoppers 70, and a driving force generating member 2 It is characterized in that it comprises a holder 50 in which the holding lug 51 is alternately in close contact with the stopper 70 positioned on both sides by the driving force generating member 2.

Sewing machine, upper thread, needle, presser foot, stopper, holder

Description

Upper thread clamping device of sewing machine {UPPER THREAD HOLDING APPARATUS FOR SEWING MACHINE}

The present invention relates to an upper thread clamping device of a sewing machine, and more particularly, when using a presser foot having a different width in clamping the end of the upper thread which is automatically cut after sewing operation is completed, for the next sewing operation. In addition, the upper thread is kept as short as possible in the needle to prevent waste of the sewing thread, and the upper thread is released from the needle, so that the upper thread can be clamped effectively even in the case of using a narrow presser foot. It effectively prevents, and the upper thread is left longer than necessary to relate to the upper thread clamping device of the sewing machine that can effectively prevent the entanglement of the sewing thread at the sewing start portion generated when starting the sewing.

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 the driving means, the use, the rotation speed, and the like. Usually, the sewing machine is 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. The frame 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).

On the other hand, such a conventional sewing machine is provided with a variety of additional mechanisms for the purpose of improving the function or for a specific operation. At this time, the upper thread clamping device of the sewing machine functions to hold the end of the upper thread automatically cut after the sewing operation is completed for the next sewing operation.

Regarding the upper thread clamping device of the sewing machine, Korean Patent Publication No. 10-0754116 "Upper Thread Clamp Device of the Sewing Machine" installs an inhaler that sucks air in the side of the needle, and installs the sewing thread with a lever between the needle and the presser foot. By pulling, it is proposed a technique for guiding one end of the sewing thread to the inlet of the inhaler to hold the sewing thread as the inhaler.

However, according to this prior art, the upper thread moved by the wiper is covered by the sewing thread supplied from the supply chamber of the needle upper part. If the sewing thread is not supplied from the upper part of the needle, the sewing thread is pulled short because the sewing thread of the lower part of the needle is pulled out. There is a problem that does not move to the device. Therefore, a separate thread winding device is required because the wire is pulled up by the thread winding device between the needle hole and the supply chamber to secure the extra length to secure an extra length, and the needle in the process of moving the upper thread with the wiper momentarily. If the upper thread inserted in the hole is cut or the feed chamber pre-pulled by the thread winding device cannot pass through the needle hole quickly, the upper thread cutting line of the lower part of the presser foot rises first, and the upper thread tip escapes the wiper and the upper thread cannot be transferred to the suction port. The problem of not clamping frequently occurred.

The inventors of the Republic of Korea Utility Model Registration No. 20-0255767 "needle-to-thread device of the sewing machine" and Patent No. 10-0460792 "upper thread clamp device of the sewing machine" to solve such problems I have suggested.

As described above, although the technique proposed by the present inventor has an excellent function compared to the above technique in clamping the upper thread, it is required to further improve the functional aspect.

At present, as the types and working conditions of the sewing objects are diversified, the necessity of exchanging and using various types of presser foot according to changing conditions such as the thickness and material of the sewing object and the sewing thread, the skill of the operator, and the performance of the sewing machine has emerged. As the use of special presser feet increases, the need for upper thread clamping devices that can satisfy them increases.

However, the upper thread clamping device according to the prior art has a problem in that its configuration is complicated and difficult to assemble, thereby making it difficult to apply compatibility for different presser feet. In addition, the narrow presser foot has a problem in that its configuration is complicated and it is difficult to apply the upper thread clamping device.

Accordingly, the present invention has been proposed to solve the problems of the prior art, and an object of the present invention is to provide an upper thread clamping device of a sewing machine of a new type which can prevent waste of the sewing thread by keeping the upper thread as short as possible from the needle. do.

In particular, the present invention, even when using the presser foot in accordance with the operating conditions of the sewing object (fabric) and the type of sewing thread, sewing material, etc. compared to the prior art, its configuration is simpler and easier to assemble can be compatible. In addition, even when using a narrow presser foot, the clamping device can be easily implemented, thereby keeping the upper thread as short as possible from the needle to prevent waste of the sewing thread, and effectively preventing the upper thread from being detached from the needle. It is an object of the present invention to provide a clamping device for the upper thread of a sewing machine of a new type which can effectively prevent the entanglement of the sewing thread at the starting point of sewing generated when the upper thread is left longer than necessary.

According to a feature of the present invention for achieving the above object, the present invention is vertically disposed on the presser foot holder 62 and the needle holder 6 on one side end of the arm (1) of the sewing machine, the upper and lower to the presser foot holder 62 An upper thread clamping device of a sewing machine having a presser foot (63) coupled to a presser foot holder (62) by a presser foot block (60), the drive force generating member (2) being operated by control of a control device of the sewing machine; A pair of stoppers 70 installed on the presser foot 63 and spaced apart from each other such that the needles 7 coupled to the needle holders 6 are positioned therebetween; A stopper 70 having a holding lug 51 positioned between a pair of stoppers 70 and connected to the driving force generating member 2 so that the holding lugs 51 are positioned on both sides by the driving force generating member 2. The upper thread clamping device of the sewing machine, characterized in that it comprises a holder (50) which is in close contact with each other as a problem solving means.

In the upper thread clamping device of the sewing machine according to the present invention, the stopper 70 may be integrally formed on both sides of the upper surface of the presser foot 63.

In the upper thread clamping device of the sewing machine according to the present invention, the holder 50 is located on the front side of the presser foot holder 62, the driving force generating member 2 is located on the rear side of the arm (1) An actuator 4 coupled to the actuator, rotatably coupled to the presser foot block 60, and having a transmission shaft 40 disposed in the front and rear directions of the arm 1 through the presser foot block 60, and the actuator 4. It may be provided with a link unit (3) for the actuation force is transmitted to the transmission shaft (40).

In the upper thread clamping device of the sewing machine according to the present invention, the actuator 4 is a solenoid for shangong the rod 5 protruding to the outside, the rod 5 in the rear side of the arm (1) in the downward direction It is coupled to the arm (1) by the fixing bracket 12, the link unit (3) is coupled to the rod (5) of the actuator (4) and the rack 19 for linear reciprocating movement in the vertical direction, and the cam shaft ( A pinion 15 which is installed on 17 and rotates in engagement with the rack 19 and the one-way bearing 16 is coupled to the center to rotate the camshaft 17 in one direction, and a rotation coupled to one end of the camshaft 17. A first actuating tool (10) having a cam (18); The hinge part is hinged to the rear side of the arm 1 by the hinge bracket 28 and is positioned on both sides of the rotary cam 18, and the protrusion part in which the rotary cam 18 alternately contacts with the rotation of the cam shaft 17 in one direction. A second actuating tool (20) formed and having a support boss (24) projecting horizontally toward the front of the arm (1) at the lower end; An upper end may be slidably coupled to the support boss 24 of the second operation tool 20, and a lower end may be provided with a coupling bar 30 coupled to the rear end of the transmission shaft 40.

In the upper thread clamping device of the sewing machine according to the present invention, the cam shaft 17 penetrating horizontally through the housing 11 of the first operating port 10 is provided with a smooth surface portion 17 'on the outer circumferential surface, the housing ( 11 forms a screw hole 11 'which is drilled toward the smooth surface portion 17' from the outer surface, and the ball 80 and the ball 80 contacting the smooth surface portion 17 'in the screw hole 11'. ) Is coupled to the spring 81 for pushing the smooth surface portion 17 'side and the stop screw 82 for adjusting the elastic force of the spring 81, so that the ball 80 is moved to the cam shaft by the elastic force of the spring 81. By pressing the smooth surface portion 17 'of the 17), the cam shaft 17 can be stably held in position from fine movement due to impact, inertia, and the like.

In addition, the upper thread clamping device of the sewing machine according to the present invention has a transmission shaft 40 horizontally penetrating the presser foot block 60 is provided with a smooth surface portion 42 on the outer circumferential surface, the presser foot block 60 is a smooth surface portion ( A screw hole 61 is formed to be drilled toward 42, and the screw hole 61 has a ball 80 in contact with the smooth surface portion 42 and a spring for pushing the ball 80 toward the smooth surface portion 42 ( 81 and the stop screw 82 for adjusting the elastic force of the spring 81, the ball 80 by pressing the smooth surface portion 42 of the transmission shaft 40 by the elastic force of the spring 81, The transmission shaft 40 makes it possible to stably hold the position from fine movements due to impact, inertia, and the like.

In the upper thread clamping device of the sewing machine according to the present invention, the presser foot (63) is the upper surface direction from the lower surface of the presser foot (63) to the inner edge of the split groove in the first half of the presser foot (63) on which the needle (7) is lifted. By forming the inclined surface (63 ') so as to rise up, the portion to be sewn on the inner surface of the groove to reduce the darkening point due to the shadow, so that the operator can easily see the position to increase the convenience of the work.

According to the upper thread clamping device of the sewing machine according to the present invention, the presser foot block 60 is provided with a pair of stoppers 70 installed on the presser foot 63 of the sewing machine and spaced apart from each other such that the needle 7 is positioned therebetween. The presser foot having a holding lug 51 positioned between the pair of stoppers 70 and having a transmission shaft 40 coupled to be rotatably coupled to the arm 1 through the presser foot block 60. (63) The holder 50 is located in the front side, the holding lug 21 is alternately in close contact with the stopper 70 located on both sides by the driving force generating member 2 to hold the upper thread (8). As a result, even when the presser foot 63 is used in accordance with working conditions such as a sewing object (fabric), a type of sewing thread, a sewing material, and the like, the structure is simpler and easier to assemble than the prior art, thereby making it compatible. Even when a special presser foot is used, the clamping device can be easily implemented. Therefore, according to the present invention, it is possible to keep the upper thread (8) as short as possible in the needle (7) to prevent waste of the sewing thread, effectively prevent the upper thread (8) from being separated from the needle (7), the upper thread ( 8) remain longer than necessary to effectively prevent entanglement of the sewing thread at the starting point of sewing, which is generated at the start of sewing, thereby providing productivity and convenience.

1 is a view for explaining the upper thread clamping device of the sewing machine according to the technical idea of the present invention.

Referring to Figure 1 (a), in the upper thread clamping device of the sewing machine according to the present invention, the presser foot holder 62 and the needle holder 6 are vertically disposed at one end of the arm 1, and the presser foot holder 62 is vertically disposed. In the upper thread clamping device of the sewing machine having the presser foot 63 which is connected to the presser foot holder 62 by the presser foot block 60 so as to be movable up and down, the driving force generating member 2 operated by the control of the control device of the sewing machine. And a pair of stoppers 70 installed on the presser foot 63 and spaced apart from each other such that the needles 7 coupled to the needle holder 6 are positioned therebetween, and positioned between the pair of stoppers 70. The holder 50 having a holding lug 51 and connected to the driving force generating member 2 alternately closely adheres to the stopper 70 at which the holding lugs 51 are positioned at both sides by the driving force generating member 2. Characterized in having a.

In the upper thread clamping device of the sewing machine according to the present invention, the driving force generating member (2) may be composed of an actuator (4), a transmission shaft (40) and a link unit (3), the actuator (4) Although a solenoid may be used as in the preferred embodiment of the present invention, such an actuator 4 may be fixed in a horizontal direction such as a control motor connected directly to the holder 50 or via a link structure, as shown in FIG. Various kinds that can generate the rotational motion of the angle can be applied. Such an actuator 4 is coupled to the sewing machine, preferably coupled to and supported by the rear side of the arm 1 of the sewing machine in close proximity to the needle 7.

Referring again to FIG. 1 (a), the presser foot 63 is coupled to the presser foot holder 62 of the sewing machine with a pair of stoppers 70 spaced apart from each other such that the needle 7 of the sewing machine is positioned therebetween. . Normally the presser foot 63 is hinged to the presser foot block 60 mounted at the lower end of the presser foot holder 62.

In the upper thread clamping device of the sewing machine according to the present invention, the stopper 70 can be detachably installed on both sides of the upper surface of the presser foot 63 by fastening means such as bolts, and protrude integrally with the presser foot 63. It may be.

In the upper thread clamping device of the sewing machine according to the present invention, the holder 50 is located in front of the presser foot holder 62, the holding lug (between the pair of stoppers 70 on the upper surface of the presser foot 63) 51, and by being connected to the actuator 4, the holding lug 51 is alternately in close contact with the stopper 70 located at both sides by the actuator 4.

In the upper thread clamping device of the sewing machine according to the present invention, the driving force generating member (2) is located on the rear side of the arm (1) and rotated to the actuator (4) and the presser foot block (60) coupled to the arm (1). The transmission shaft 40, which is coupled to be possible and disposed in the front and rear directions of the arm 1 through the presser foot block 60, and the link unit 3, which transmits the operating force of the actuator 4 to the transmission shaft 40. It may be provided.

On the other hand, although not shown in the drawings illustrating the present invention, the upper thread (8) is inserted into the hole of the needle (7), the upper thread 8 is maintained in a tensioned state by the side pretension and rotary tension of the sewing machine Done. In addition, the sewing machine usually comprises an arm extending in the front and rear direction, and a bed consisting of a bed extending in the front and rear direction and extending in the front and rear direction, a frame connecting the arm and the bed, driving means for moving the needle, and a presser foot for pressing the sewing object. , A moving means for relatively moving the needle and the presser foot, and a drum mechanism is provided. Of course, the configuration and operation of such a sewing machine can be applied according to the needs of the consumer or the manufacturer's convenience by applying the conventional techniques that are variously provided in this field.

The upper thread clamping device of the sewing machine according to the present invention through such a configuration, the actuator 4 is operated by the control device (not shown) of the sewing machine, the link unit 3 transmits the operating force of the actuator 4 shaft 40 When transmitted to a predetermined angle in one direction, the holder 50 coupled to the end of the transmission shaft 40 also moves accordingly to move the holding lug 51 in the direction of the stopper 70 on one side. Through this process, the holding lug 51 alternately contacts the stoppers 70 on both sides, thereby holding the upper thread 8.

The upper thread clamping device of the sewing machine according to the present invention is because the holding lug 51 of the holder 50 is moved in the left and right direction to hold the upper thread (8), thereby adjusting the play in the left and right direction (in the case of a step motor, the rotation angle It is possible to adjust the upper thread 8 even if the width of the presser foot 63 is narrow. Therefore, since the clamping of the upper thread 8 is made effectively, the configuration is simple and easy to assemble, but the presser foot can be used by exchanging the presser foot according to the working conditions such as the object to be sewn (fabric), the type of sewing thread, and the sewing material. In addition, since the fixing of the upper thread 8 can be made stable, the waste thread of the sewing thread can be prevented by keeping the upper thread 8 as short as possible in the needle 7, and the upper thread 8 is detached from the needle 7. It is effectively prevented, and the upper thread (8) will remain longer than necessary to effectively prevent the entanglement of the sewing thread at the starting point of sewing generated when starting the sewing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 2 to 8, and like reference numerals designate like elements in FIGS. 1 to 8. Meanwhile, the drawings and detailed descriptions of configurations, operations, and effects that can be easily understood by those skilled in the art from general technology in each drawing are briefly or omitted, and are illustrated based on parts related to the present invention. In addition, in describing the preferred embodiment of the present invention, description of the assembly and working relationship that can be easily understood by those skilled in the art with reference to the drawings is omitted as possible, in particular assembly of bolts, pins, etc. for fixing And the reference signs and descriptions thereof as far as possible.

1 is a view for explaining the upper thread clamping device of the sewing machine according to the technical idea of the present invention, Figure 2 is a perspective view showing the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention from the rear of the sewing machine, Figure 3 Is an exploded perspective view of the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention, Figure 4 is a view showing the assembly process of the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention, Figure 5 is 6 and 7 are views illustrating an operation of the link unit 3 in the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention. 8 is a view illustrating the positions of the cam shaft 17 and the transmission shaft 40 in the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention. It is a figure for demonstrating the structure holding stably.

2 and 3, the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention is installed and used in a conventional sewing machine classified into various types.

In the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention, the actuator (4) is a solenoid for sending the rod (5) protruding to the outside, the rod (5) in the rear side of the arm (1) downward It is coupled to the arm 1 by a support bracket 4 'so as to be directed toward.

In addition, the link unit 3 is coupled to the rod 5 of the actuator 4 and the rack 19 linearly reciprocating in the up and down direction, and is installed on the cam shaft 17, rotates in engagement with the rack 19, the center A first actuating tool 10 having a pinion 15 coupled to the one-way bearing 16 to rotate the camshaft 17 in one direction, and a rotating cam 18 coupled to one end of the camshaft 17. do.

In addition, the link unit 3 is hinged to the rear side of the arm 1 by a hinge bracket 28 and is located on both sides of the rotary cam 18, and the rotary cam 18 in accordance with the one-way rotation of the cam shaft 17. The projection 22 which alternately abuts) is formed, and the 2nd operation tool 20 which has the support boss 24 which protrudes horizontally toward the front of the arm 1 from the lower end is provided.

In addition, the link unit 3 has a coupling bar 30 having an upper end slidably coupled to the support boss 24 of the second operation tool 20 and a lower end coupled to the rear end of the transmission shaft 40. Characterized in that.

In the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention, the first operating port 10 of the link unit 3 is coupled to the rear side of the arm 1 of the sewing machine by the fixing bracket 12, the actuator The housing 11 located below (4) is provided.

Then, it is installed on the camshaft 17 horizontally installed in the housing 11 and is coupled to the rod 5 of the actuator 4 to rotate in engagement with the rack 19 linearly reciprocating in the vertical direction and one-way in the center The bearing 16 is coupled to the pinion 15 for rotating the camshaft 17 in one direction.

The first actuating tool 10 is coupled to one end of the cam shaft 17 by converting the linear reciprocation of the rod 5 of the actuator 4 into the rotational movement by the rack 19 and the pinion 15. The rotating cam 18 is to rotate in one direction.

The lower end of the first operating port 10 is provided with a guide arm 13 through which the lower end of the rack 19 is slidably inserted to support the lower end of the rack 19. Here, referring to FIG. 8A, the camshaft 17 penetrating horizontally through the housing 11 of the first operating tool 10 has a smooth surface portion 17 ′ on its outer circumferential surface, and the housing 11. Is formed to form a screw hole 11 'which is drilled toward the smooth surface portion 17' from the outer surface, and the ball 80 and the ball 80 contacting the smooth surface portion 17 'in the screw hole 11'. The spring 81 which pushes to the smooth surface part 17 'and the stop screw 82 which adjusts the elastic force of the spring 81 are couple | bonded in order, and the ball 80 has the cam shaft by the elastic force of the spring 81. By pressing the smooth surface portion 17 'of the 17), the cam shaft 17 can be stably held in position from fine movement due to impact, inertia, and the like.

Referring to FIG. 3, the second actuating tool 20 of the link unit 3 is coupled on the hinge shaft 29 of the hinge bracket 28 which is coupled to the rear side of the arm 1 of the sewing machine, and rotates the cam 18. It is provided with a plate 21 located in front of.

The protrusions 22 protrude to both sides of the upper end of the plate 21 and are positioned at both sides of the rotary cam 18, and the rotary cams 18 alternately contact each other as the cam shaft 17 rotates in one direction. do.

Both side projections 22 are formed with an inclined surface 23 to allow the rotation cam 18 to rotate in one direction by the cam shaft 17 smoothly.

The inclined surface 23 is formed uphill in the direction in which the rotary cam 18 is rotated so that the inclined surface 23 of both projections 22 facing each other are formed in parallel.

The second operating tool 20 is rotated while the rotating cam 18 alternately abuts against the inclined surface 23 of both projections 22, the second operating tool 20 is hinged (21 ') It is to be angular movement in the left and right direction about the hinge axis (29) inserted in the.

The second operation tool 20 supports a pair of long holes 25 projecting horizontally from the lower end of the plate 21 toward the front of the sewing machine (the presser foot block 60) and circumferentially drilling up and down the outer circumferential surface. The boss 24 is provided. In addition, a connection pin 26 is provided with a connection hole 27 communicating with the pair of long holes 25 vertically and rotatably coupled to the inside of the rotation hole 24 ′ of the support boss 24.

Referring to FIG. 5, when the rotary cam 18 alternately contacts the inclined surface 23 of the protrusion 22, the second operating tool 20 may be angled about the hinge shaft 29. By movement, the connecting pin 26 rotatably mounted inside the support boss 24 is angularly moved about the hinge axis 29.

On the other hand, the upper end is slidably coupled to the connection hole 27 of the connecting pin 26, the lower end is provided with a coupling bar 30 is located behind the presser foot block 60. The lower side of the coupling bar 30 is formed with a connecting boss 31 to which the stop screw 32 is coupled inward from the outer surface.

On the other hand, the transmission shaft 40 penetrates horizontally to the presser foot block 60 of the sewing machine, one end is coupled to the lower connecting boss 31 of the coupling bar 30, and the other end extends in the front direction of the sewing machine. It is provided. The transmission shaft 40 is a connection hole 27 vertically drilled into the connecting pin 26 of the second operation tool 20. The coupling bar 30 having the upper end slidably coupled thereon is presser foot. It is to be rotated left and right on the block 60.

Referring to the process of the transmission shaft 40 rotates left and right in more detail with reference to Figures 6 and 7, the second operating port 20 is hinged by the rotary cam 18 of the first operating port (10). When the angular movement around the shaft 29, the coupling bar 30, the upper end of which is coupled to the connecting pin 26 of the second operating port 20, the left and right sides of the connecting boss 31, Exercised. At this time, the upper end of the coupling bar 30 penetrating through the connection hole 27 of the connecting pin 26 to flow in the long hole 25 provided on the upper and lower sides of the support boss 24 of the second operation port 20. By doing so, the left and right sides of the connecting boss 31 are angularly moved.

As described above, the coupling bar 30 is angularly moved around the connecting boss 31 such that the transmission shaft 40 having one end coupled to the connecting boss 31 rotates left and right on the presser foot block 60.

Here, when the presser foot holder 62 lifts and lowers during sewing, the upper end of the coupling bar 30 is raised or lowered by sliding the connecting hole 27 of the connecting pin 26, and the support boss even during the angular movement. It is to be moved up and down by sliding the connection hole 27 while flowing in the long hole 25 of (24).

On the other hand, the other end of the transmission shaft 40 located in the front of the presser foot block 60 by penetrating the presser foot block 60 horizontally, the assembling hole 41 is vertically drilled, and from the outer surface toward the assembly hole 41 inside. The stop screw 43 to be assembled is coupled.

The holder 50 is coupled to the assembling hole 41 of the transfer shaft 40. The upper end of the holder 50 is inserted into the assembling hole 41, and the presser foot is adjusted by adjusting the up and down position of the holder 50. The holder 50 is fixedly coupled to the front end of the transmission shaft 40 by accurately positioning the holding lugs 51 and tightening the stop screw 43 between the pair of stoppers 70 disposed on both sides of the upper surface of the 63). Will be.

The holder 50 is angularly moved around the transmission shaft 40 as the transmission shaft 40 is rotated on the presser foot block 60 so that the holding lugs 51 at the bottom thereof are both stoppers on the upper surface of the presser foot 63. 70) alternately in close contact.

Meanwhile, referring to FIGS. 6 and 7, the presser foot 63 has an inner side edge (the 'U'-shaped recess inner side edge which is split in the first half of the presser foot 63) on which the needle 7 moves up and down of the presser foot 63. By forming the inclined surface (63 ') to rise in the upward direction from the lower surface, to reduce the point that the sewing portion of the inner surface of the cracked' U 'groove portion of the first half of the presser foot (63) during the sewing operation is darkened by the shadow, The location can be easily seen, thereby increasing the convenience of the work.

The stopper 70 on both sides of the upper surface of the presser foot 63 attaches a silicon rubber plate to the inner surface of the upper thread 8 so as to effectively hold the upper thread 8 and the holding lugs 51 of the holder 50. Make sure to prevent noise caused by bumps. Here, the silicone rubber plate may be wound around the outer circumferential surface of the holding lug 51 that is in contact with the inner surface of the stopper 70 to hold the upper thread 8 more effectively and block the generation of noise.

Referring to FIG. 8B, the transmission shaft 40 penetrating the presser foot block 60 horizontally has a smooth surface portion 42 on its outer circumferential surface, and the presser foot block 60 has a smooth surface portion ( A screw hole 61 is formed to be drilled toward 42, and the screw hole 61 has a ball 80 in contact with the smooth surface portion 42 and a spring for pushing the ball 80 toward the smooth surface portion 42 ( 81, and the stop screw 82 for adjusting the elastic force of the spring 81 in sequence, by the elastic force of the spring 81, the ball 80 presses the smooth surface portion 42 of the transmission shaft 40 In this way, the transmission shaft 40 can be stably positioned from fine movements due to impact, inertia, and the like.

The upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention as described above includes a driving force generating member including an actuator 4, a link unit 3, and a transmission shaft 40 horizontally penetrating the presser foot block 60 ( 2) the holder 50 positioned on the front side of the presser foot holder 62 is angularly moved so that the holding lugs 51 of the holder 50 alternately with the stoppers 70 on both sides of the upper surface of the presser foot 63. By being close to the end of the upper thread (8) by clamping, after the sewing operation is completed in the sewing machine, to hold the end of the upper thread (8) automatically cut for the next sewing operation.

Although the upper thread clamping device of the sewing machine according to an embodiment of the present invention as described above has been shown in accordance with the above description and drawings, this is merely an example, and various changes without departing from the spirit of the present invention. And those skilled in the art will appreciate that changes are possible.

1 is a view for explaining the upper thread clamping device of the sewing machine according to the technical idea of the present invention;

Figure 2 is a perspective view showing the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention from the rear of the sewing machine;

3 is an exploded perspective view of the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention;

4 is a view showing an assembly process of the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention;

5 is a view for explaining the operating state of the upper thread clamping device of the sewing machine according to a preferred embodiment of the present invention;

6 and 7 are views showing the operation of the link unit 3 in the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention;

8 is a view for explaining stably holding the position of the cam shaft 17 and the transmission shaft 40 in the upper thread clamping device of the sewing machine according to the preferred embodiment of the present invention.

1: {Sewing machine} arm 2: Driving force generating member

3: link unit 4: actuator

5: rod 6: needle holder

7: needle 8: upper thread

10: first operating port 20: second operating port

30: coupling bar 40: transmission shaft

50: holder 51: holding lugs

60: presser foot block 62: presser foot holder

63: presser foot 70: stopper

Claims

The presser foot holder 62 and the needle holder 6 are vertically disposed at one end of the arm 1, and the presser foot holder 62 is connected to the presser foot holder 62 by the presser foot block 60 so as to be movable up and down on the presser foot holder 62. In the upper thread clamping device of the sewing machine having a presser foot 63 is coupled,

A driving force generating member 2 operated by the control of the control device of the sewing machine;

A pair of stoppers (70) installed on the presser foot (63) and spaced apart from each other such that the needles (7) coupled to the needle holders (6) are positioned therebetween;

The holding lug 51 is positioned between the pair of stoppers 70 and is connected to the driving force generating member 2 so that the holding lugs 51 are positioned at both sides by the driving force generating member 2. Upper thread clamping device of the sewing machine, characterized in that it comprises a holder (50) which is in close contact with the stopper (70).

The method of claim 1,

The stopper 70 is the upper thread clamping device of the sewing machine, characterized in that formed integrally protruding on both sides of the upper surface of the presser foot (63).

The method according to claim 1 or 2,

The holder 50 is located in front of the presser foot holder 62,

The driving force generating member (2) is located at the rear side of the arm (1) and the actuator (4) coupled to the arm (1),

A transmission shaft 40 rotatably coupled to the presser foot block 60 and disposed in the front and rear directions of the arm 1 through the presser foot block 60;

Upper thread clamping device of the sewing machine, characterized in that it comprises a link unit (3) for transmitting the operating force of the actuator (4) to the transmission shaft (40).

The method of claim 3, wherein

The actuator 4 is a solenoid for conveying the rod 5 protruding to the outside, and the arm 1 is fixed by the fixing bracket 12 so that the rod 5 faces downward from the rear side of the arm 1. ),

The link unit (3) is coupled to the rod (5) of the actuator (4) is installed on the cam shaft (17) and the linear reciprocating linear movement in the vertical direction, and rotates in engagement with the rack (19) One-way bearing 16 is coupled to the center portion of the first operating mechanism having a pinion 15 for rotating the cam shaft 17 in one direction, and a rotary cam 18 coupled to one end of the cam shaft 17 )Wow;

It is hinged to the rear side of the arm 1 by a hinge bracket 28 and is located on both sides of the rotary cam 18, and the rotary cam 18 alternately in accordance with the one-way rotation of the cam shaft 17. A second actuating tool (20) formed with abutting protrusion (22) and having a support boss (24) projecting horizontally toward the front of the arm (1) at a lower end thereof;

The sewing machine, characterized in that the upper end is slidably coupled to the support boss 24 of the second operation tool 20, the lower end is coupled to the rear end of the transmission shaft (40). Upper thread clamping device.

The method of claim 4, wherein

The camshaft 17 penetrating horizontally through the housing 11 of the first operation tool 10 has a smooth surface portion 17 'on its outer circumferential surface,

The housing 11 forms a screw hole 11 ′ which is drilled toward the smooth surface portion 17 ′ from an outer surface thereof, and a ball 80 contacting the smooth surface portion 17 ′ in the screw hole 11 ′. ), A spring 81 for pushing the ball 80 toward the smooth surface portion 17 'and a stop screw 82 for adjusting an elastic force of the spring 81,

The ball 80 presses the smooth surface portion 17 'of the camshaft 17 by the elastic force of the spring 81, so that the camshaft 17 can stably be positioned from impact or inertia. Upper thread clamping device of the sewing machine, characterized in that.

The method of claim 4, wherein

The transmission shaft 40 penetrating the presser foot block 60 horizontally has a smooth surface portion 42 on its outer circumferential surface,

The presser foot block 60 forms a screw hole 61 that is drilled toward the smooth surface portion 42 from an outer surface, and the screw hole 61 has a ball 80 in contact with the smooth surface portion 42, Combining the spring 81 for pushing the ball 80 toward the smooth surface portion 42 and the stop screw 82 for adjusting the elastic force of the spring 81,

The ball 80 presses the smooth surface portion 42 of the transmission shaft 40 by the elastic force of the spring 81, so that the transmission shaft 40 can stably position its position from impact or inertia. Upper thread clamping device of the sewing machine, characterized in that to be able to.

The method of claim 1,

The presser foot 63 is characterized in that the inclined surface (63 ') is formed so as to ascend in the upper surface direction from the lower surface of the presser foot 63, the inner groove edge of the split groove portion of the presser foot (63) to which the needle (7). The upper thread clamping device of the sewing machine.