CN215404926U - Sewing machine and thread passing structure thereof - Google Patents

Abstract

The utility model provides a sewing machine thread passing structure and a sewing machine, wherein the sewing machine thread passing structure comprises a first thread gripper, a second thread gripper, a first thread passing plate, a thread picking plate, a thread passing plate, an upper curved needle and a lower curved needle, the thread picking plate is rotatably connected with a machine body of the sewing machine, the thread passing plate is provided with a first thread passing part and a second thread passing part, a first needle thread sequentially passes through the first thread passing plate, the thread picking plate, the first thread passing part and the upper curved needle by the first thread gripper, and a second needle thread sequentially passes through the first thread passing plate, the thread picking plate, the second thread passing part and the lower curved needle by the second thread gripper. The first thread passing part and the second thread passing part are arranged on the thread passing plate to respectively pass threads, so that the thread storage amount and the thread consumption amount of the upper and lower curved needles can be stabilized, various sewing processes such as thin, medium and thick material overlocking are met, the smooth thread outlet and the smooth and attractive stitch are ensured, and the product quality can be improved.

Description

Sewing machine and thread passing structure thereof

Technical Field

The utility model relates to the technical field of sewing, in particular to a sewing machine thread passing structure and a sewing machine.

Background

Overedgers, also known as welts, plaiting machines, overlocking machines or charters, generally divide into three, four, five and six threads, the main function of which is generally to prevent the sewing of the garments from raising. The overedger can be used for edge wrapping and can also be used for sewing fabrics such as T-shirts, sportswear, underwear, knitting and the like.

The overedger is a complex and precise sewing machine, and mainly comprises a needle mechanism, a thread hooking mechanism, a thread taking-up mechanism, a feeding mechanism, a cutter mechanism and a cloth lifting and pressing mechanism, wherein when a main shaft rotates, the needle mechanism, a needle bending mechanism, the feeding mechanism and a knife rest mechanism are respectively driven by a transmission mechanism to perform accurate motion matching, so that the overedger operation is realized. The sewing process of the overedger stitch is as follows: 1) the thread needle penetrates through the sewing material and is positioned at the lowest point, when the thread needle is about to ascend, the lower curved needle and the upper curved needle are both positioned at the side most position of the thread needle, and the thread needle is about to move towards the direction of the thread needle; 2) the thread needle rises, the lower curved needle penetrates through the thread needle thread ring from left to right, and the upper curved needle penetrates through the lower curved needle thread ring at the same time; 3) the thread needle withdraws from the sewing material, the thread needle thread loop is expanded by the lower bending needle, and simultaneously the upper bending needle swings from the right to the left and upwards; 4) the upper curved needle continues to swing towards the upper left corner, and the thread needle which passes through the surface of the sewing material moves the thread. The sewing material is pushed forward by a stitch length, the thread needle descends, starts to penetrate through a thread loop formed by the upper bending needle, and starts to puncture the sewing material; 5) the thread needle passes through the sewing material and continues to descend, the upper curved needle and the lower curved needle respectively move towards opposite directions to be far away from the thread needle, meanwhile, the thread needle thread loop and the lower curved needle thread loop which are respectively passed by the lower curved needle and the upper curved needle start to respectively separate from the lower curved needle and the upper curved needle, and the thread needle is still in the upper curved needle thread loop. So far, all the wire rings are interpenetrated and sheathed; 6) the thread on the thread needle and the threads on the upper and lower curved needles start to tighten the stitches under the action of the respective thread take-up devices to form the final overedged stitches.

The traditional overedger finds that the problems of unsmooth line outlet, uneven stitch seam, unattractive appearance and the like often occur when the traditional overedger is used for overlocking thin materials, the problems are found by investigation to be related to the instability of the line storage quantity and the line collection quantity of an upper curved needle and a lower curved needle, and no good solution is provided at present, so that the application range of the traditional sewing machine structure cloth is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a thread passing structure of a sewing machine and the sewing machine, which can stabilize the thread storage amount and the thread consumption amount of an upper curved needle and a lower curved needle, meet various sewing processes of serging thin, medium and thick materials and the like, and ensure smooth thread outlet and smooth and beautiful stitch.

In order to achieve the above object, the present invention provides a thread passing structure of a sewing machine, including a first thread gripper, a second thread gripper, a first thread passing plate, a thread picking plate, a thread passing plate, an upper looper and a lower looper, wherein the thread picking plate is rotatably connected to a machine body of the sewing machine, the thread passing plate is provided with a first thread passing part and a second thread passing part, a first needle thread sequentially passes through the first thread passing plate, the thread picking plate, the first thread passing part and the upper looper by the first thread gripper, and a second needle thread sequentially passes through the first thread passing plate, the thread picking plate, the second thread passing part and the lower looper by the second thread gripper.

Optionally, the thread passing plate comprises a mounting area and a thread passing area which are connected, the mounting area is attached to the body of the sewing machine, the thread passing area is perpendicular to the mounting area, and the first thread passing part and the second thread passing part are located in the thread passing area.

Optionally, the wire passing area is L-shaped, one end of the wire passing area is vertically connected to the mounting area, the other end of the wire passing area extends vertically in a direction away from the mounting area, and the first wire passing portion and the second wire passing portion respectively penetrate through the other end of the wire passing area.

Optionally, the first wire passing part and the second wire passing part are arranged at the same height.

Optionally, one end of the thread take-up plate is rotatably connected with the machine body, a first thread passing hole and a second thread passing hole are formed in the other end of the thread take-up plate, the first thread passing hole and the second thread passing hole respectively correspond to the first thread passing portion and the second thread passing portion, and the height of the first thread passing hole is lower than that of the first thread passing portion and the height of the second thread passing hole is lower than that of the second thread passing portion.

Optionally, the second wire passing hole is located below the first wire passing hole, the position of the second wire passing hole is adjustable, and the center distance between the projections of the first wire passing hole and the second wire passing hole in the height direction is not greater than 4 mm.

Optionally, the first and second wire passing portions are groove-shaped or hole-shaped.

Optionally, the top of first threading board is provided with the third of two isotemperature and crosses the line hole and the fourth crosses the line hole, the bottom of first threading board is provided with the fifth and crosses the line hole, the third cross the line hole the fourth cross the line hole and the fifth cross the line hole is triangular distribution, first needle thread by first thread gripper passes in order the third cross the line hole the thread board first thread portion reaches go up the looper, the second needle thread by second thread gripper passes in order the fourth cross the line hole the fifth cross the line hole the thread board the second cross the thread portion and go up the looper.

Optionally, the position of the fifth wire passing hole is adjustable, the height difference between the third wire passing hole and the fifth wire passing hole is between 15mm and 25mm, and the center distance of the projection of the third wire passing hole and the fifth wire passing hole in the height direction is between 6mm and 16 mm.

Optionally, the sewing machine thread passing structure further comprises a second thread passing plate, the second thread passing plate comprises a sixth thread passing hole and a seventh thread passing hole, the first needle thread is sequentially passed through the first thread clamping device by the first thread passing plate, the thread picking plate, the first thread passing part, the sixth thread passing hole and the upper looper, and the second needle thread is sequentially passed through the second thread clamping device by the first thread passing plate, the thread picking plate, the second thread passing part, the seventh thread passing hole and the lower looper.

Optionally, the height of the sixth wire through hole is lower than the height of the first wire through part, and the height of the seventh wire through hole is lower than the height of the second wire through part.

Optionally, the thread passing structure of the sewing machine further comprises a swing arm, one end of the swing arm is rotatably connected with the machine body, the other end of the swing arm is connected with the lower looper and the second threading plate, and the swing arm drives the lower looper and the second threading plate to move when rotating relative to the machine body.

Optionally, the swing arm is pivoted relative to the body by an angle of not more than 30 °.

Based on the above, the utility model also provides a sewing machine, which comprises the thread passing structure of the sewing machine.

In the thread passing structure of the sewing machine and the sewing machine provided by the utility model, the first thread passing part and the second thread passing part are arranged on the thread passing plate to respectively pass threads, so that the first needle thread and the second needle thread which respectively pass through the upper curved needle and the lower curved needle can stabilize the thread storage amount and the thread consumption amount, when the needle moves to the highest point, the thread storage amount of the thread passing structure of the sewing machine can meet the requirements of thin, medium and thick cloth, and when the needle moves to the lowest point, the thread storage amount of the thread passing structure of the sewing machine is effectively used up by the thin, medium and thick cloth, so that various sewing processes such as overlock of the thin, medium and thick cloth can be met, the smooth, flat and beautiful stitch can be ensured, and the quality of products can be improved.

Drawings

FIG. 1 is a schematic structural view of a conventional thread passing structure of a sewing machine;

FIG. 2 is a schematic structural view of a thread passing structure of a sewing machine according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a wire-passing board according to an embodiment of the present invention;

FIG. 4 is a front view of a thread take-up device according to an embodiment of the present invention;

FIG. 5 is a left side view of the thread take-up device according to the embodiment of the present invention;

FIG. 6 is a schematic view of a thread passing structure of a sewing machine with an upward needle movement according to an embodiment of the present invention;

FIG. 7 is a schematic view of a thread passing structure of a sewing machine with a needle moving downward according to an embodiment of the present invention;

fig. 8 is a front view of a first stringing board according to an embodiment of the present invention;

fig. 9 is a schematic view illustrating a position adjustment of a fifth wire hole according to an embodiment of the present invention;

fig. 10 is a schematic view of a second threading plate according to an embodiment of the utility model;

fig. 11 is an adjustment diagram of a second threading plate according to an embodiment of the utility model;

wherein the reference numerals are:

1-a first wire gripper; 2-a second wire gripper; 3-a first threading plate; 4-a thread take-up plate; 5-a wire passing plate; 6-a second threading plate; 7-bending the needle upwards; 8-bending the needle downwards; 9-body;

11-a first wire gripper; 12-a second wire gripper; 13-a first threading plate; 14-a thread take-up board; 15-a wire passing plate; 16-a second threading plate; 17-bending up the needle; 18-lower curved needle; 19-body; 20-a swing arm;

131-a third wire passing hole; 132-a fourth wire passing hole; 133-a fifth wire passing hole; 141-a first wire passing hole; 142-a second wire passing hole; 151-first crossover section; 152-a second wire passing portion; 153-a mounting area; 154-wire passing area; 155-pinch plate; 161-sixth wire passing holes; 162-a seventh wire passing hole;

d 1-the center distance of the projection of the first wire through hole and the second wire through hole in the height direction;

h 1-height difference between the third wire passing hole and the fifth wire passing hole;

d 2-the center distance of the projection of the third wire passing hole and the fifth wire passing hole in the height direction;

theta-the angle of rotation of the second threading plate relative to the machine body.

Detailed Description

The traditional overedger finds that the problems of unsmooth line outlet, uneven stitch seam, unattractive appearance and the like often occur when the traditional overedger is used for overlocking thin materials, the problems are found by investigation to be related to the instability of the line storage quantity and the line collection quantity of an upper curved needle and a lower curved needle, and no good solution is provided at present, so that the application range of the traditional sewing machine structure cloth is limited.

Specifically, referring to fig. 1, fig. 1 is a schematic structural diagram of a thread passing structure of a conventional sewing machine. The sewing machine threading structure includes first thread trapper 1, second thread trapper 2, first threading board 3, take-up 4, cross thread board 5, second threading board 6, go up looper 7 and lower looper 8, take-up 4 rotates with sewing machine's organism 9 to be connected, first needle thread by first thread trapper 1 passes in order first threading board 3 take-up 4 pass thread board 5 and second threading board 6 reach go up looper 7, second needle thread by second thread trapper 2 passes in order first threading board 3 take-up 4 second threading board 5 reaches looper 8 down.

As can be seen from the attached drawings, the first needle thread penetrates through the thread passing plate 5, and the second needle thread does not penetrate through the thread passing plate 5 but directly penetrates through the thread taking-up plate 4 to the second thread passing plate 6, so that the first needle thread and the second needle thread are inconsistent in stroke at the thread taking-up plate 4, and therefore, the thread storage amount and the thread take-up amount of the upper and lower loopers are unstable during sewing. The design has little influence on the sewing processes such as serging of medium and thick materials, because the tightening force of the thread ring of the serging of the medium and thick materials is enough, and when serging of thin materials, the tightening force of the thread ring is not enough, so that the thread storage amount and the thread take-up amount of the upper and lower curved needles are unstable, the tightness of the thread ring is inconsistent, the shape after forming is not uniform, and finally, the sewing stitches are not smooth and beautiful.

In order to solve the above problems, a core idea of the present invention is to provide a thread passing structure of a sewing machine and a sewing machine, in which a first thread passing part and a second thread passing part are disposed on a thread passing plate to respectively pass threads, so that both the first needle thread and the second needle thread passing through an upper looper and a lower looper can stably store and use thread, when a needle moves to a highest point, the thread storage amount of the thread passing structure of the sewing machine can satisfy thin, medium and thick cloth, and ensure smooth thread outlet, smooth stitch seam smoothness and beautiful appearance, and when the needle moves to a lowest point, the thread storage amount of the thread passing structure of the sewing machine is effectively used up, so that various sewing processes such as overlocking of thin, medium and thick cloth can be satisfied, smooth thread outlet, smooth stitch smoothness and beautiful appearance are ensured, and product quality can be improved.

To further clarify the objects, advantages and features of the present invention, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise. As used in this disclosure, the term "at least two" is generally employed in a sense including "two or more" unless the content clearly dictates otherwise. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of the features.

Referring to fig. 2-3, fig. 2 is a schematic structural view of a thread passing structure of a sewing machine according to an embodiment of the present invention, and fig. 3 is a schematic structural view of a thread passing plate according to an embodiment of the present invention. The embodiment provides a sewing machine thread passing structure, including first thread gripper 11, second thread gripper 12, first threading board 13, take-up 14, pass line board 15, go up looper 17 and lower looper 18, take-up 14 rotates with sewing machine's organism 19 to be connected, it is provided with first thread passing portion 151 and second thread passing portion 152 on the line board 15 to cross, first needle thread by first thread gripper 11 passes in order first threading board 13 take-up 14 first thread passing portion 151 reaches go up looper 17, second needle thread by the second thread gripper passes in order first threading board 13 take-up 14 second thread passing portion 152 reaches lower looper.

In this embodiment, the thread passing structure of the sewing machine is mainly applied to a overedger. In addition, the thread passing structure of the sewing machine can be applied to an integrated sewing machine and a non-integrated sewing machine, and the application is not limited to any way.

In addition, the number of the thread grippers is not limited, the number of the thread grippers can be determined according to overedged stitches, and the number of the thread grippers can be three, four, five or six. In this embodiment, the overedger is a four-thread overedger, the number of the thread grippers is four, the second thread gripper is a first thread gripper 11, and the first thread gripper is a second thread gripper 12. It should be understood that the thread clamping device in this embodiment should include the common parts such as the thread passing piece, and through adjusting the first thread clamping device 11 and the tightness of the second thread clamping device, the thread storage amount of the first needle thread and the second needle thread can be adjusted, so that the thread storage amount of the thread passing structure of the sewing machine can meet the requirements of thin, medium and thick cloth, and the smooth and neat and beautiful thread outlet and stitch can be ensured.

Referring to fig. 3, the thread passing plate 15 is provided with a first thread passing part 151 and a second thread passing part 152, the first needle thread passes through the first thread passing plate 13, the thread taking-up plate 14, the first thread passing part 151 and the upper looper 17 in sequence by the first thread holder 11, and the second needle thread passes through the first thread passing plate 13, the thread taking-up plate 14, the second thread passing part 152 and the lower looper 18 in sequence by the second thread holder 12. Compared with the traditional thread passing structure of the sewing machine, the thread passing plate 15 is additionally provided with the second thread passing part 152 to stabilize the thread storage amount and the thread consumption amount of the second needle thread, so that the first needle thread and the second needle thread which respectively pass through the upper curved needle 17 and the lower curved needle 18 can stabilize the thread storage amount and the thread consumption amount, further, when the first sewing machine moves to the highest point, the thread storage amount of the thread passing structure of the sewing machine can meet the requirements of thin, medium and thick cloth, the thread outlet is ensured to be smooth, the stitch is smooth and attractive, and when the sewing machine moves to the lowest point, the thread storage amount of the thread passing structure of the sewing machine is effectively used up by the thin, medium and thick cloth, various sewing processes such as edge overlocking of thin, medium and thick cloth can be met, the cloth application range is wide, the debugging is simple, and the product quality can be improved.

Further, the first threading part 151 and the second threading part 152 are disposed at the same height to ensure that the thread storage amount and the thread usage amount of the first needle thread and the second needle thread are adapted. The equal-height arrangement mentioned in the present application is defined by a height in a vertical direction, and the height of the first needle thread at the first over-line part 151 is the same as the height of the second needle thread at the second over-line part 152. Of course, the first threading part 151 and the second threading part 152 are not arranged at equal heights according to specific requirements, or the heights of the first threading part and the second threading part have a certain manufacturing error, and the error is within the allowable error of the over-lock stitch.

The first and second threading parts 151 and 152 have a groove shape or a hole shape so that the first and second stitches can be confined in a certain region. The groove shape can be a groove, a V-shaped groove, a trapezoid groove and the like, the hole shape can be a round hole, a square hole or a hole with other shapes, and the application does not limit the shape. The first and second wire-passing portions 151 and 152 may be formed by forming a groove or an opening in a plate-shaped structure, or may be formed by folding a linear structure such as a wire, which is not limited in this application. In this embodiment, the first and second wire-crossing portions 151 and 152 are circular holes.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a wire-passing board according to an embodiment of the present invention. The thread passing plate 15 comprises a mounting area 153 and a thread passing area 154 which are connected, the mounting area 153 is attached to the body 19 of the sewing machine, the thread passing area 154 is perpendicular to the mounting area 153, and the first thread passing part 151 and the second thread passing part 152 are located in the thread passing area 154. In this embodiment, the mounting area 153 may be fixed on the machine body 19 of the sewing machine by a screw connection, and the top of the mounting area 153 is further provided with a fastening plate 155, and the fastening plate 155 extends outward and is fastened on the machine body 19.

Further, the wire passing area 154 is L-shaped, one end of the wire passing area 154 is vertically connected to the mounting area 153, the other end of the wire passing area 154 extends vertically in a direction away from the mounting area 153, and the first wire passing portion 151 and the second wire passing portion 152 penetrate through the other end of the wire passing area. The first and second wire-passing portions 151 and 152 are preferably disposed by extending a portion of the wire-passing region 154 in a direction away from the mounting region 153. Of course, the wire passing area 154 may also have other shapes, such as a strip shape, which is not limited in this application.

Referring to fig. 4 to 5, fig. 4 is a front view of a thread take-up board according to an embodiment of the present invention, and fig. 5 is a left view of the thread take-up board according to the embodiment of the present invention. One end of the thread take-up plate 14 is rotatably connected to the body 19, and the other end thereof is provided with a first thread through hole 141 and a second thread through hole 142, the first thread through hole 141 and the second thread through hole 142 respectively correspond to the first thread through part 151 and the second thread through part 152, and the height of the first thread through hole 141 is lower than that of the first thread through part 151 and the height of the second thread through hole 142 is lower than that of the second thread through part 152. Through the arrangement of the first thread passing hole 141 and the second thread passing hole 142, when a sewing machine sews, the first needle thread passes through the first thread passing plate 13, the first thread passing hole 141, the first thread passing part 151 and the upper looper 17 in sequence by the first thread holder 11, and the second needle thread passes through the first thread passing plate 13, the second thread passing hole 142, the second thread passing part 152 and the lower looper 18 in sequence by the second thread holder.

In this embodiment, please refer to fig. 6, fig. 6 is a schematic diagram of a thread passing structure of a sewing machine with an upward needle movement according to an embodiment of the present invention, when the needle moves upward, one end of the thread take-up plate 14 swings upward (clockwise swing), and the thread amount stored at the thread take-up plate 14 is a thread storage amount, and when the needle moves downward, fig. 7 is a schematic diagram of a thread passing structure of a sewing machine with a downward needle movement according to an embodiment of the present invention, one end of the thread take-up plate 14 swings downward (counterclockwise swing), and the thread storage amount of the thread passing structure of the sewing machine is effectively used up by a cloth. The first thread passing hole 141 and the second thread passing hole 142 are lower than the first thread passing part 151 and the second thread passing hole 152, respectively, so that the thread reserve amount of the take-up plate 14 is better in the process of swinging up and down.

In this embodiment, the sewing machine further includes a motor and a related transmission mechanism, the motion of the needle and the swing of the thread take-up plate 14 are controlled by the motor driving the corresponding transmission mechanism.

Further, with reference to fig. 4, the second wire passing hole 142 is located below the first wire passing hole 141, the position of the second wire passing hole 142 is adjustable, and the center-to-center distance d1 between the projections of the first wire passing hole 141 and the second wire passing hole 142 in the height direction is not greater than 4 mm. That is, projections of the first wire through hole 141 and the second wire through hole 142 in the height direction may not coincide, and a center-to-center distance of the projections of the first wire through hole 141 and the second wire through hole 142 in the height direction is not greater than 4 mm. The relative position of the second thread passing hole 142 and the first thread passing hole 141 is adjusted, so that the thread storage amount and the thread consumption amount of the second needle thread can be adjusted. The second wire through hole 142 may move leftwards relative to the first wire through hole 141 or rightwards relative to the first wire through hole 141, and the maximum moving range thereof is not greater than 4 mm.

For example, the adjustable manner is that the second wire passing hole 142 is disposed on a metal plate, and the metal plate can slide relative to the take-up plate 14 and then can be fixed by a threaded connection or the like.

Referring to fig. 8, fig. 8 is a front view of a first threading plate according to an embodiment of the present invention, two third thread passing holes 131 and fourth thread passing holes 132 having equal heights are formed in the top of the first threading plate 13, a fifth thread passing hole 133 is formed in the first threading plate 13, the third thread passing hole 131, the fourth thread passing hole 132 and the fifth thread passing hole 133 are distributed in a triangular shape, the first needle thread sequentially passes through the third thread passing hole 131, the thread-taking-up plate 14, the first thread passing portion 151 and the upper looper 17 by the first thread gripper 11, and the second needle thread sequentially passes through the fourth thread passing hole 132, the fifth thread passing hole 133, the thread-taking-up plate 14, the second thread passing portion 152 and the lower looper 18 by the second thread gripper.

Further, referring to fig. 8 and 9, the position of the fifth wire passing hole 133 is adjustable, the dotted line in fig. 9 is the position of the fifth wire passing hole 133 after moving, the height difference h1 between the third wire passing hole 131 and the fifth wire passing hole 133 is between 15mm and 25mm, and the center distance d2 of the projection of the third wire passing hole 131 and the fifth wire passing hole 133 in the height direction is between 6mm and 16 mm. In this embodiment, a chute is disposed at the bottom of the first threading plate 13, the fifth threading hole 133 may be disposed on a slider, the slider may slide in the chute to adjust the position of the fifth threading hole 133, and when the position of the fifth threading hole 133 changes, the threading track of the second needle and the thread storage amount and the thread usage amount of the second needle and the thread are adjusted. In this embodiment, the center-to-center distance of the projections of the third wire passing hole 131 and the fourth wire passing hole 132 in the height direction is between 22mm and 26 mm.

Referring to fig. 1 in combination with fig. 10, fig. 10 is a schematic view of a second threading plate according to an embodiment of the present invention, the thread passing structure of the sewing machine further includes a second threading plate 16, the second threading plate 16 includes a sixth thread passing hole 161 and a seventh thread passing hole 162, the first needle thread passes through the first threading plate 13, the thread take-up plate 14, the first thread passing portion 151, the sixth thread passing hole 161 and the upper looper 17 in sequence by the first thread clamp 11, and the second needle thread passes through the first threading plate 13, the thread take-up plate 14, the second thread passing portion 152, the seventh thread passing hole 162 and the lower looper 18 in sequence by the second thread clamp.

In this embodiment, the height of the sixth thread passing hole 161 is lower than the height of the first thread passing part 151, and the height of the seventh thread passing hole 162 is lower than the height of the second thread passing part 152, so that the threading tracks of the first needle thread and the second needle thread are not a straight line, and the thread storage and the thread use can be better performed.

Further, please refer to fig. 1, fig. 10 and fig. 11, fig. 11 is a schematic movement diagram of a swing arm according to an embodiment of the present invention, the thread passing structure of the sewing machine further includes a swing arm 20, one end of the swing arm 20 is rotatably connected to the machine body 19, the other end of the swing arm 20 is fixedly connected to the lower looper 18 and the second threading plate 16, and when the swing arm 20 rotates relative to the machine body 19, the swing arm drives the lower looper 18 and the second threading plate 16 to move, so as to adjust tightness of the first needle thread and the second needle thread, thereby stabilizing the thread storage amount and the thread usage amount of the first needle thread and the second needle thread.

Further, the swing arm rotates relative to the machine body by an angle not greater than 30 °, in other words, the second threading plate 16 rotates relative to the machine body by an angle θ not greater than 30 °.

Based on this, this embodiment still provides a sewing machine, includes above-mentioned sewing machine line structure. Of course, sewing machine still should include feeding mechanism, cutter mechanism, lift conventional spare parts such as compress mechanism, and this application is no longer repeated this.

To sum up, the embodiment of the utility model provides a thread passing structure of a sewing machine and the sewing machine, wherein a first thread passing part and a second thread passing part are arranged on a thread passing plate to respectively pass threads, so that the first needle thread and the second needle thread which respectively pass through an upper curved needle and a lower curved needle can stably store the thread quantity and the thread consumption, when the needle moves to the highest point, the thread storage quantity of the thread passing structure of the sewing machine can meet the requirements of thin, medium and thick cloth, the smooth thread outlet and the smooth and attractive stitch seam are ensured, and when the needle moves to the lowest point, the thread storage quantity of the thread passing structure of the sewing machine is effectively used up by the thin, medium and thick cloth, so that various sewing processes such as the overlocking of thin, medium and thick cloth can be met, the smooth thread outlet and smooth and attractive stitch are ensured, and the quality of products can be improved.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (14)

1. The utility model provides a sewing machine crosses line structure, its characterized in that includes first thread trapper, second thread trapper, first threading board, take-up board, crosses the line board, goes up the looper and reaches looper down, take-up board rotates with sewing machine's organism to be connected, cross and be provided with first threading portion and second threading portion on the line board, first needle line by first thread trapper passes in order first threading board take-up board first threading portion reaches go up the looper, second needle line by the second thread trapper passes in order first threading board take-up board second threading portion reaches looper down.

2. The thread passing structure of a sewing machine according to claim 1, wherein the thread passing plate comprises a mounting area and a thread passing area which are connected, the mounting area is attached to the body of the sewing machine, the thread passing area is perpendicular to the mounting area, and the first thread passing part and the second thread passing part are located in the thread passing area.

3. The thread passing structure of a sewing machine according to claim 2, wherein the thread passing region is L-shaped, one end of the thread passing region is vertically connected to the mounting region, the other end of the thread passing region extends vertically in a direction away from the mounting region, and the first thread passing portion and the second thread passing portion respectively penetrate through the other end of the thread passing region.

4. The thread passing structure of sewing machine according to claim 1, wherein the first thread passing portion and the second thread passing portion are disposed at the same height.

5. The thread passing structure of a sewing machine according to claim 1, wherein one end of the thread take-up plate is rotatably connected to the machine body, and the other end thereof is provided with a first thread passing hole and a second thread passing hole, the first thread passing hole and the second thread passing hole respectively correspond to the first thread passing part and the second thread passing part, and the first thread passing hole is lower than the first thread passing part and the second thread passing hole is lower than the second thread passing part.

6. The thread passing structure of a sewing machine according to claim 5, wherein the second thread passing hole is located below the first thread passing hole, the position of the second thread passing hole is adjustable, and the center-to-center distance of the projections of the first thread passing hole and the second thread passing hole in the height direction is not more than 4 mm.

7. The thread passing structure of sewing machine according to claim 1, wherein the first thread passing part and the second thread passing part are in a groove shape or a hole shape.

8. The thread passing structure of a sewing machine according to claim 1, wherein the top of the first thread passing plate is provided with a third thread passing hole and a fourth thread passing hole which are equal in height, the bottom of the first thread passing plate is provided with a fifth thread passing hole, the third thread passing hole, the fourth thread passing hole and the fifth thread passing hole are distributed in a triangular shape, the first needle thread passes through the third thread passing hole, the thread take-up plate, the first thread passing part and the upper looper in sequence by the first thread gripper, and the second needle thread passes through the fourth thread passing hole, the fifth thread passing hole, the thread take-up plate, the second thread passing part and the lower looper in sequence by the second thread gripper.

9. The thread passing structure of a sewing machine according to claim 8, wherein the position of the fifth thread passing hole is adjustable, the height difference between the third thread passing hole and the fifth thread passing hole is 15mm-25mm, and the center distance of the projection of the third thread passing hole and the fifth thread passing hole in the height direction is 6mm-16 mm.

10. The thread passing structure of a sewing machine according to claim 1, further comprising a second thread passing plate including a sixth thread passing hole and a seventh thread passing hole, wherein the first needle thread passes through the first thread passing plate, the thread take-up plate, the first thread passing portion, the sixth thread passing hole and the upper looper in sequence by the first thread gripper, and the second needle thread passes through the first thread passing plate, the thread take-up plate, the second thread passing portion, the seventh thread passing hole and the lower looper in sequence by the second thread gripper.

11. The thread passing structure of a sewing machine according to claim 10, wherein the height of the sixth thread passing hole is lower than the height of the first thread passing part, and the height of the seventh thread passing hole is lower than the height of the second thread passing part.

12. The thread passing structure of sewing machine according to claim 10, further comprising a swing arm, wherein one end of the swing arm is pivotally connected to the machine body, and the other end of the swing arm is connected to the lower looper and the second threading plate, and the swing arm drives the lower looper and the second threading plate to move when rotating relative to the machine body.

13. The sewing machine thread passing structure of claim 12, wherein the swing arm rotates relative to the machine body by an angle of no more than 30 °.

14. A sewing machine comprising a sewing machine thread passing structure according to any one of claims 1 to 13.

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