Sewing machine

Abstract

The invention discloses a sewing machine which comprises a swing shaft, a thread sweeping mechanism and a switching mechanism connected between the swing shaft and the thread sweeping mechanism. The switching mechanism comprises a thread sweeping driving crank fixedly connected with the swing shaft, a thread sweeping sliding block arranged in a sliding mode and perpendicularly connected with the thread sweeping driving crank, a thread sweeping linkage shaft perpendicular to the swing shaft, a first thread sweeping linkage crank fixedly connected with the thread sweeping linkage shaft and a thread sweeping connecting rod hinged between the thread sweeping sliding block and the first thread sweeping linkage crank. When the swing shaft swings, the thread sweeping driving crank drives the thread sweeping sliding block to slide, the thread sweeping sliding block drives the first thread sweeping linkage crank to act through the thread sweeping connecting rod, the first thread sweeping linkage crank drives the thread sweeping linkage shaft to swing, swing of the swing shaft is converted into swing of the thread sweeping linkage shaft in the direction perpendicular to the swing shaft, and the swing direction of the swing shaft is converted. The swing shaft provides power for the thread sweeping mechanism through the switching mechanism, driving pieces such as an electromagnet do not need to be additionally arranged, the failure rate is reduced, and working reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to a sewing machine. Background Art

[0002] After the thread trimming mechanism of the sewing machine trims the thread, the thread sweeping mechanism sweeps the cut upper thread out of the fabric so that the upper thread will not be pressed by the presser foot when sewing next time, and the thread ends of the upper thread will remain on the back of the fabric instead of being exposed on the surface. However, the existing thread sweeping mechanism needs to be separately configured with an electromagnet to drive it, and the electromagnet is prone to failure, affecting the working reliability of the entire machine. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a sewing machine, in which a conversion mechanism is added between the swing shaft and the thread sweeping mechanism, so as to convert the swing of the swing shaft into the swing of the thread sweeping linkage shaft in a direction perpendicular to the swing shaft, without the need for an additional electromagnet, with a lower failure rate and higher working reliability.

[0004] To achieve the above object, the present invention provides a sewing machine, comprising a swing shaft, a thread sweeping mechanism and a conversion mechanism connected between the swing shaft and the thread sweeping mechanism, wherein the conversion mechanism comprises:

[0005] A sweeping line driving crank fixedly connected to the swing shaft;

[0006] A wire sweeping slider which is slidably arranged and vertically connected to the wire sweeping driving crank;

[0007] A sweeping line linkage axis perpendicular to the swing axis;

[0008] A first sweeping line linkage crank fixedly connected to the sweeping line linkage shaft;

[0009] A wire sweeping connecting rod is hinged between the wire sweeping sliding block and the first wire sweeping linkage crank.

[0010] Preferably, the conversion mechanism also includes a wire sweeping connecting block connected between the wire sweeping slider and the wire sweeping driving crank; the wire sweeping connecting block is provided with a sliding connecting column and a fixed connecting hole, the sliding connecting column is slidingly connected to the wire sweeping driving crank, and the fixed connecting hole is fixedly connected to the wire sweeping slider.

[0011] Preferably, the conversion mechanism further comprises a second line-sweeping linkage crank fixedly connected to the line-sweeping linkage shaft, and the line-sweeping mechanism comprises:

[0012] A rotatable wire sweeping connecting plate;

[0013] A wire sweeping pull rod, one end of which is hinged to the second wire sweeping linkage crank and the other end of which is slidably connected to the wire sweeping connecting plate via a sliding connecting pin;

[0014] A sweeping rod that can be rotatably arranged;

[0015] A wire sweeping pull plate hinged between the wire sweeping connecting plate and the wire sweeping rod;

[0016] A wire sweeping resetting elastic member is connected between the wire sweeping pull rod and the sliding connecting pin and is used to assist the wire sweeping pull rod in resetting.

[0017] Preferably, it also includes:

[0018] A thread striking mechanism, a first thread clamping driving cam, and a second thread clamping driving cam respectively fixed to the swing shaft;

[0019] A first thread clamp abutting against a first thread clamp driving cam;

[0020] A second thread clamp abutting against a second thread clamp driving cam;

[0021] When the swing shaft swings, the thread beating mechanism, the first thread clamping driving cam and the second thread clamping driving cam are driven synchronously with the swing shaft, the thread beating mechanism swings to beating the thread, the highest point of the first thread clamping driving cam abuts against the first thread clamp to push open the first thread clamp to loosen the thread, and the lowest point of the second thread clamping driving cam abuts against the second thread clamp to enable the second thread clamp to clamp the thread.

[0022] Preferably, it also includes a lifting and pressing mechanism fixed to the swing shaft, and the lifting and pressing mechanism includes:

[0023] A lifting and pressing driving crank fixed to the swing shaft;

[0024] A presser foot base with a lifting hook and rotatable arrangement;

[0025] A lifting rod assembly, one end of which is connected to the lifting and pressing driving crank and the other end of which is hung on the lifting hook and can be slidably arranged;

[0026] A lifting, pressing and resetting elastic member with one end fixedly arranged and the other end abutting against the presser foot seat;

[0027] When the swing shaft swings, the lifting and pressing driving crank swings with the swing shaft, and the lifting and pressing driving crank lifts the presser foot seat through the lifting rod group to realize the presser foot lifting;

[0028] When the swing shaft is reset, the lifting and pressing reset elastic member pushes the presser foot seat to move downward and reset.

[0029] Preferably, the lifting rod assembly comprises:

[0030] A lifting and pressing sliding block slidably arranged in a lifting and pressing sliding groove arranged on the lifting and pressing driving crank;

[0031] A lifting and pressing support hinged to the lifting and pressing slide block;

[0032] A lifting and pressing connecting rod which is fixedly connected to the lifting and pressing support and can slide through a fixed lifting and pressing sliding sleeve;

[0033] A lifting rod is fixedly sleeved on the lifting and pressing connecting rod.

[0034] Preferably, the outer side surface of the lifting rod is stepped and forms a limited position boss, and the lifting rod assembly further includes:

[0035] A locking fastener disposed on the lifting and pressing support and abutting against the lifting and pressing connecting rod;

[0036] A limiting nut sleeved on the limiting shaft section of the lifting rod;

[0037] A limiting roller sleeved on the limiting shaft section of the lifting rod and with two ends respectively abutting against the limiting nut and the limiting boss;

[0038] A limiting locking piece is arranged at one end of the lifting rod away from the limiting nut and abuts against the lifting and pressing connecting rod.

[0039] Preferably, it also includes a main driving mechanism fixedly connected to the swing shaft, and the main driving mechanism includes:

[0040] A main drive cam that can be rotatably arranged;

[0041] A main drive roller abutting against an outer cam surface of the main drive cam;

[0042] A main driving push rod fixedly connected to the main driving roller and slidably arranged;

[0043] A supporting rod abutting against the main driving jack;

[0044] A main driving crank fixedly connected between the top support rod and the swing shaft;

[0045] A swing shaft resetting elastic member, one end of which is fixedly arranged and the other end of which is fixedly connected to the swing shaft and is used to assist in resetting the swing shaft.

[0046] Preferably, it also includes a thread cutting mechanism, which includes:

[0047] A thread trimmer drive roller disposed in a cam groove of a main drive cam;

[0048] A thread trimmer drive crank rotatably arranged and connected to the thread trimmer drive roller;

[0049] Rotatable thread cutting knife;

[0050] A thread trimming connecting rod connected between the thread trimming driving crank and the thread trimming moving knife;

[0051] Fixed setting of thread trimming fixed knife;

[0052] When the thread trimming driving roller moves from the initial position to the lowest position along the cam groove, the thread trimming driving crank drives the thread trimming movable knife to rotate relative to the thread trimming fixed knife through the thread trimming connecting rod to achieve thread trimming.

[0053] Preferably, the thread trimmer connecting rod comprises a rear thread trimmer connecting rod, a middle thread trimmer connecting rod and a front thread trimmer connecting rod which are connected in sequence, and a length adjustment component is provided between any two of the three connected links, and the length adjustment component comprises a waist-shaped adjustment hole provided in any one of the two connected links and at least one adjustment fastener passing through the waist-shaped adjustment hole and connected to the other one.

[0054] Compared with the background technology, the sewing machine provided by the present invention adds a conversion mechanism between the swing shaft and the thread sweeping mechanism, and the conversion mechanism includes a thread sweeping driving crank fixedly connected to the swing shaft, a thread sweeping slider slidably arranged and vertically connected to the thread sweeping driving crank, a thread sweeping linkage shaft perpendicular to the swing shaft, a first thread sweeping linkage crank fixedly connected to the thread sweeping linkage shaft, and a thread sweeping connecting rod hinged between the thread sweeping slider and the first thread sweeping linkage crank.

[0055] When the swing shaft swings at a certain angle, the sweeping wire driving crank swings synchronously with the swing shaft, and the sweeping wire driving crank drives the sweeping wire slider to slide, and the sweeping wire slider drives the first sweeping wire linkage crank to move through the sweeping wire connecting rod, so that the first sweeping wire linkage crank drives the sweeping wire linkage shaft to swing, and the sweeping wire linkage shaft is perpendicular to the swing shaft. In this way, the swinging of the swing shaft is converted into the swinging of the sweeping wire linkage shaft in a direction perpendicular to the swing shaft, thereby realizing the conversion of the swinging direction of the swing shaft, so that the swing shaft provides power for the sweeping wire mechanism through the conversion mechanism, and there is no need to set up additional driving parts such as electromagnets, which can effectively eliminate faults caused by unstable operation of driving parts such as electromagnets, reduce the failure rate, and improve the working reliability of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0057] Figure 1 An assembly diagram of various mechanisms in a sewing machine provided by a specific embodiment of the present invention;

[0058] Figure 2 for Figure 1 Another view of;

[0059] Figure 3 for Figure 1 Structural diagram of the middle sweeping line mechanism;

[0060] Figure 4 for Figure 1 Structural diagram of the conversion mechanism;

[0061] Figure 5 for Figure 4 Exploded diagram of

[0062] Figure 6 for Figure 1 An assembly diagram of the middle thread striking mechanism, the first thread clamping driving cam, the second thread clamping driving cam, the first thread clamp and the second thread clamp;

[0063] Figure 7 for Figure 1 Structural diagram of the middle lifting and pressing mechanism;

[0064] Figure 8 for Figure 7 Structural diagram of the middle lifting rod group;

[0065] Fig. 9 for Figure 1 Structural diagram of the main driving mechanism;

[0066] Fig.10 for Figure 1 The structural diagram of the main driving cam;

[0067] Fig.11 for Figure 1 Structural diagram of the thread trimming mechanism;

[0068] Fig.12 for Fig.11 Structural diagram of the mid-length adjustment assembly.

[0069] The reference numerals are as follows:

[0070] The swing shaft 100, the thread sweeping mechanism 200, the conversion mechanism 300, the thread punching mechanism 400, the first thread clamping driving cam 501, the second thread clamping driving cam 502, the first thread clamp 601, the second thread clamp 602, the lifting and pressing mechanism 700, the main driving mechanism 800 and the thread trimming mechanism 900;

[0071] A wire sweeping connecting plate 201, a sliding connecting pin 202, a wire sweeping pull rod 203, a wire sweeping rod 204, a wire sweeping pull plate 205, a wire sweeping resetting elastic member 206, a connecting plate rotating pin 207, a wire sweeping bracket 208 and a connecting plate limiting column 209;

[0072] A sweeping line driving crank 301, a sweeping line slider 302, a sweeping line linkage shaft 303, a first sweeping line linkage crank 304, a sweeping line connecting rod 305, a sweeping line connecting block 306, a second sweeping line linkage crank 307 and a slider guide rod 308;

[0073] Sliding coupling column 3061 and fixed coupling hole 3062;

[0074] Sliding connection hole 3011;

[0075] Fixed connecting column 3021;

[0076] Wire connection block 401 and wire rack 402

[0077] A first cam surface 5011;

[0078] A second cam surface 5021;

[0079] A lifting and pressing driving crank 701, a lifting hook 702, a presser foot seat 703, a lifting rod group 704, a lifting and pressing reset elastic member 705, a hinge shaft 706 and a feeding slide plate 707;

[0080] Lifting and pressing chute 7011;

[0081] A lifting and pressing slider 7041, a lifting and pressing support 7042, a lifting and pressing sleeve 7043, a lifting and pressing connecting rod 7044, a lifting rod 7045, a locking fastener 7046, a limiting nut 7047, a limiting roller 7048 and a limiting locking member 7049;

[0082] Main driving cam 801, main driving roller 802, main driving push rod 803, support rod 804, main driving crank 805, swing shaft reset elastic member 806, main driving motor 807, push rod guide sleeve 808 and anti-deflection guide plate 809;

[0083] An outer cam surface 8011 and a cam groove 8012;

[0084] A thread trimming driving roller 901, a thread trimming driving crank 902, a thread trimming moving knife 903, a thread trimming connecting rod 904, a thread trimming fixed knife 905 and a length adjustment component 906;

[0085] Crank shaft 9021;

[0086] Moving knife shaft 9031;

[0087] A rear connecting rod 9041 for trimming the thread, a middle connecting rod 9042 for trimming the thread, and a front connecting rod 9043 for trimming the thread;

[0088] Waist-shaped adjustment hole 9061 and adjustment fastener 9062. DETAILED DESCRIPTION

[0089] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0090] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0091] First of all, it should be noted that the directions indicated by the directional words such as up, down, left, right, front and back in the text are all attached. Figure 1 The current direction shown is valid.

[0092] The embodiment of the present invention discloses a sewing machine, as shown in the attached Figure 1 and 2 As shown, it includes a swing shaft 100, a line sweeping mechanism 200 and a conversion mechanism 300. The swing shaft 100 is used to transmit power to each connected mechanism. The conversion mechanism 300 is connected between the swing shaft 100 and the line sweeping mechanism 200, and is used to change the swing mode of the swing shaft 100 so that the swing shaft 100 can provide power for the line sweeping mechanism 200.

[0093] As attached Figure 4 and 5 As shown, the conversion mechanism 300 includes a sweeping line driving crank 301, a sweeping line slider 302, a sweeping line linkage shaft 303, a first sweeping line linkage crank 304 and a sweeping line connecting rod 305. Wherein, the sweeping line driving crank 301 is fixedly connected to the swing shaft 100. Specifically, the sweeping line driving crank 301 is sleeved on the swing shaft 100, and the sweeping line driving crank 301 is fixed on the swing shaft 100 by means of a fastening screw. Of course, the fixing method of the sweeping line driving crank 301 is not limited to this. The sweeping line slider 302 can be slidably sleeved on the slider guide rod 308, and the slider guide rod 308 is fixedly arranged, and the slider guide rod 308 is used to guide the sweeping line slider 302 to slide linearly up and down. The sweeping line slider 302 is vertically connected to the sweeping line driving crank 301, and the sweeping line linkage shaft 303 is arranged perpendicular to the swing shaft 100 to provide conditions. The sweeping line linkage shaft 303 is perpendicular to the swing shaft 100, and the two swing synchronously, but the swinging directions of the two are perpendicular. The first line sweeping linkage crank 304 is fixedly connected to the line sweeping linkage shaft 303. The end of the first line sweeping linkage crank 304 is provided with a crank mounting hole, and the line sweeping linkage shaft 303 is inserted into the crank mounting hole. The side wall of the crank mounting hole is provided with a notch, and a fastening screw is installed at the notch. By tightening the fastening screw, the first line sweeping linkage crank 304 is fixedly connected to the line sweeping linkage shaft 303, which is convenient for disassembly and assembly. Of course, the fastening method between the first line sweeping linkage crank 304 and the line sweeping linkage shaft 303 is not limited to this. The line sweeping connecting rod 305 is hinged between the line sweeping slider 302 and the first line sweeping linkage crank 304, and the line sweeping connecting rod 305 and the line sweeping slider 302 and the line sweeping connecting rod 305 and the first line sweeping linkage crank 304 can be hingedly connected by a hinge pin, but are not limited to this.

[0094] When the swing shaft 100 swings at a certain angle, the sweeping line driving crank 301 swings synchronously with the swing shaft 100, and the sweeping line driving crank 301 drives the sweeping line slider 302 to slide, and the sweeping line slider 302 drives the first sweeping line linkage crank 304 to move through the sweeping line connecting rod 305, so that the first sweeping line linkage crank 304 drives the sweeping line linkage shaft 303 to swing, and the sweeping line linkage shaft 303 is perpendicular to the swing shaft 100, so that the swinging direction of the swing shaft 100 is converted into the sweeping line linkage shaft 303 swinging in a direction perpendicular to the swing shaft 100, so as to realize the conversion of the swinging direction of the swing shaft 100, so that the swing shaft 100 provides power for the sweeping line mechanism 200 through the conversion mechanism 300, and there is no need to set up additional driving parts such as electromagnets, which can effectively eliminate the faults caused by the unstable operation of driving parts such as electromagnets, reduce the fault rate, and improve the working reliability of the whole machine.

[0095] The conversion mechanism 300 also includes a sweeping line coupling block 306 connected between the sweeping line slider 302 and the sweeping line driving crank 301, so that the sweeping line driving crank 301 can drive the sweeping line slider 302 to slide along the sliding guide rod through the sweeping line coupling block 306 as the swing shaft 100 swings. When the sweeping line driving crank 301 swings, considering that the distance between the sweeping line driving crank 301 and the sweeping line coupling block 306 will change, the sweeping line coupling block 306 is integrally provided with a sliding coupling column 3061, and the sliding coupling column 3061 is slidably connected to the sliding connection hole 3011 provided in the sweeping line driving crank 301, so that the distance between the sweeping line driving crank 301 and the sweeping line coupling block 306 changes with the swing angle of the sweeping line driving crank 301. The line sweeping connecting block 306 is also provided with a fixed connecting hole 3062, which is fixedly connected to the line sweeping slider 302. The line sweeping slider 302 is integrally provided with a fixed connecting column 3021, which is threadedly connected to the fixed connecting hole 3062. Of course, the connection method between the line sweeping connecting block 306 and the line sweeping slider 302 is not limited to this.

[0096] When the swing shaft 100 swings counterclockwise, the sweeping line driving crank 301 swings counterclockwise with the swing shaft 100, and the sweeping line driving crank 301 drives the sweeping line slider 302 to slide upward along the slider guide rod 308. The sweeping line slider 302 pulls the first sweeping line linkage crank 304 backward through the sweeping line connecting rod 305, and the first sweeping line linkage crank 304 drives the sweeping line linkage shaft 303 to swing backward. Conversely, when the swing shaft 100 swings clockwise, the sweeping line linkage shaft 303 swings forward.

[0097] The conversion mechanism 300 also includes a second sweeping line linkage crank 307 fixedly connected to the sweeping line linkage shaft 303, so that the sweeping line linkage shaft 303 drives the sweeping line mechanism 200 to move through the second sweeping line linkage crank 307. Specifically, the connection method between the sweeping line linkage shaft 303 and the second sweeping line linkage crank 307 can refer to the connection method between the sweeping line linkage shaft 303 and the first sweeping line linkage crank 304, which will not be described in detail here.

[0098] As attached Figure 3 As shown, the line sweeping mechanism 200 includes a line sweeping connecting plate 201, a line sweeping rod 203, a line sweeping rod 204, a line sweeping pulling plate 205 and a line sweeping resetting elastic member 206. The line sweeping connecting plate 201 can be rotatably arranged. The line sweeping connecting plate 201 is L-shaped, and the middle section thereof can be rotatably sleeved on the connecting plate rotating pin 207. The connecting plate rotating pin 207 is fixedly arranged to support the rotation of the line sweeping connecting plate 201. One end of the line sweeping pulling rod 203 is hinged to the second line sweeping linkage crank 307 and the other end is slidably connected to the line sweeping connecting plate 201 through the sliding connecting pin 202. The line sweeping pulling rod 203 and the second line sweeping linkage crank 307 can be hingedly connected through a hinge pin. The end of the line sweeping rod 203 away from the second line sweeping linkage crank 307 is provided with a waist-shaped slide groove, and the sliding connecting pin 202 can be slidably arranged in the waist-shaped slide groove. The sliding connecting pin 202 is hingedly connected to one end of the line sweeping connecting plate 201. The sliding cooperation between the waist-shaped slide groove and the sliding connecting pin 202 can make the line sweeping rod 203 slide through a section of empty travel when it moves to the extreme position, so as to prevent the line sweeping rod 203 from getting stuck when it is pulled back. The line sweeping rod 204 can be rotatably arranged to perform the line sweeping action. Specifically, the line sweeping mechanism 200 also includes a fixedly arranged line sweeping bracket 208, and the line sweeping rod 204 is hingedly connected to the line sweeping bracket 208 through a hinge pin, so that the line sweeping rod 204 rotates relative to the line sweeping bracket 208. The installation position of the line sweeping bracket 208 can be adjusted up and down, so as to adjust the line sweeping amplitude of the line sweeping rod 204. Specifically, the fixed end of the line sweeping bracket 208 can be provided with a waist-shaped hole, and the position of the line sweeping rod 204 is adjusted by the waist-shaped hole. The line sweeping pull plate 205 is hinged between the line sweeping connecting plate 201 and the line sweeping rod 204, so that the line sweeping connecting plate 201 drives the line sweeping rod 204 to rotate through the line sweeping pull plate 205. The line sweeping pull plate 205 and the line sweeping connecting plate 201 and the line sweeping pull rod 203 and the line sweeping rod 204 are all hingedly connected by hinge pins. The line sweeping reset elastic member 206 is connected between the line sweeping pull rod 203 and the sliding connecting pin 202, which can ensure that the line sweeping connecting plate 201 rotates smoothly before rotating to the limit position, and can assist the line sweeping pull rod 203 to quickly reset after the swing shaft 100 is reset. Specifically, the line sweeping reset elastic member 206 can be a common cylindrical spring, one end of which is hooked in the spring hooking groove provided by the line sweeping pull rod 203, and the other end can be hooked on the sliding connecting pin 202.

[0099] The line sweeping mechanism 200 also includes a fixed connecting plate limiting column 209. When the line sweeping connecting plate 201 rotates to the extreme position, the line sweeping connecting plate 201 and the connecting plate limiting column 209 abut against each other to limit the position of the line sweeping connecting plate 201, thereby preventing the line sweeping connecting plate 201 from rotating excessively and effectively controlling the swinging end position of the line sweeping rod 204 when sweeping the line.

[0100] When the first line sweeping linkage crank 304 drives the line sweeping linkage shaft 303 to swing backward, the line sweeping linkage shaft 303 pulls the line sweeping pull rod 203 to move backward through the second line sweeping linkage crank 307, and the line sweeping pull rod 203 drives the line sweeping connecting plate 201 to rotate counterclockwise, and the line sweeping connecting plate 201 drives the line sweeping rod 204 to rotate clockwise relative to the line sweeping bracket 208 through the line sweeping pull plate 205, thereby realizing one line sweeping action. Conversely, when the first line sweeping linkage crank 304 drives the line sweeping linkage shaft 303 to swing forward, the line sweeping rod 204 rotates counterclockwise relative to the line sweeping bracket 208.

[0101] As attached Figure 6 As shown, the sewing machine further includes a thread punching mechanism 400, a first thread clamping driving cam 501, a second thread clamping driving cam 502, a first thread clamp 601 and a second thread clamp 602. The thread punching mechanism 400, the first thread clamping driving cam 501 and the second thread clamping driving cam 502 are all fixedly mounted on the swing shaft 100, and the three swing synchronously with the swing shaft 100. Specifically, the thread punching mechanism 400, the first thread clamping driving cam 501 and the second thread clamping driving cam 502 are all sleeved on the swing shaft 100, and are all fixed on the swing shaft 100 by means of fastening screws. However, it should be noted that the first thread clamping driving cam 501 and the second thread clamping driving cam 502 are arranged at an angle to ensure that one of them clamps the thread and the other loosens the thread at the same time. The outer contours of the first clamping line driving cam 501 and the second clamping line driving cam 502 are both semi-elliptical, the first cam surface 5011 of the first clamping line driving cam 501 and the second cam surface 5021 of the second clamping line driving cam 502 are both planes, the first clamping line 601 abuts against the first cam surface 5011 of the first clamping line driving cam 501, and the second clamping line 602 abuts against the second cam surface 5021 of the second clamping line driving cam 502. The first clamping line 601 and the second clamping line 602 are respectively arranged on both sides of the wire punching mechanism 400, and the structures of the two are the same, and the specific details can be referred to the prior art.

[0102] When the swing shaft 100 swings, the thread-tying mechanism 400, the first thread-clamping driving cam 501 and the second thread-clamping driving cam 502 are driven synchronously with the swing shaft 100, and the thread-tying mechanism 400 swings to tie the thread. At the same time, the highest point of the first thread-clamping driving cam 501 abuts against the first thread clamp 601, and the first cam surface 5011 pushes open the first thread clamp 601, so that the first thread clamp 601 loosens the thread; the lowest point of the second thread-clamping driving cam 502 abuts against the second thread clamp 602, so that the second thread clamp 602 clamps the thread. In this way, the thread-tying mechanism 400 completes a thread-tying action with the cooperation of the first thread clamp 601 and the second thread clamp 602.

[0103] The wire-tying mechanism 400 includes a wire-tying connection block 401 and a wire-tying frame 402. The wire-tying connection block 401 is sleeved on the swing shaft 100 and fixed on the swing shaft 100 by a fastening screw. The wire-tying frame 402 is vertically fixed to the wire-tying connection block 401. The wire-tying frame 402 has a wire-passing hole, and the wire-passing hole can be used for the upper wire to pass through. When the wire-tying connection block 401 swings with the swing shaft 100, the wire-tying rod swings synchronously with the wire-tying connection block 401, and the wire-tying rod drives the upper wire passing through the wire-tying hole to be tyed for a distance.

[0104] The sewing machine further comprises a lifting and pressing mechanism 700 fixedly mounted on the swing shaft 100, as shown in the attached Figure 7 As shown, the lifting and pressing mechanism 700 includes a lifting and pressing driving crank 701, a presser foot seat 703, a lifting rod group 704 and a lifting and pressing reset elastic member 705. The lifting and pressing driving crank 701 is fixed to the swing shaft 100. The lifting and pressing driving crank 701 is specifically sleeved on the end of the swing shaft 100 away from the sweeping line driving crank 301, and is fixed to the swing shaft 100 by a fastening screw. The presser foot seat 703 has a lifting hook 702, and a presser foot is mounted on the presser foot seat 703. The presser foot seat 703 is hinged to the feeding slide plate 707 through a hinge shaft 706. One end of the lifting rod group 704 is connected to the lifting and pressing driving crank 701 and the other end is hung on the lifting hook 702. The lifting rod group 704 can be slidably arranged. One end of the lifting and pressing reset elastic member 705 is fixedly arranged and the other end is against the presser foot seat 703, which is used to assist the presser foot seat 703 in resetting. The lifting and pressing resetting elastic member 705 may specifically be a common cylindrical spring vertically arranged on the pressure foot seat 703, but is not limited thereto.

[0105] When the swing shaft 100 swings counterclockwise, the lifting and pressing driving crank 701 swings counterclockwise with the swing shaft 100, and the lifting and pressing driving crank 701 lifts the lifting hook 702 through the lifting rod group 704, the presser foot seat 703 rotates upward, and the lifting and pressing reset elastic member 705 is squeezed and pressed to achieve lifting, completing a lifting and pressing action. When the swing shaft 100 is reset, the lifting and pressing reset elastic member 705 restores its elastic deformation, and the lifting and pressing reset elastic member 705 pushes the presser foot seat 703 to move down and reset.

[0106] As attached Figure 8As shown, the lifting rod group 704 includes a lifting and pressing slider 7041, a lifting and pressing support 7042, a lifting and pressing connecting rod 7044 and a lifting rod 7045. The end of the lifting and pressing driving crank 701 away from the swing shaft 100 is provided with a lifting and pressing slide groove 7011, and the lifting and pressing slide groove 7011 is a waist-shaped groove. The lifting and pressing slider 7041 can be slidably arranged in the lifting and pressing slide groove 7011. The lifting and pressing support 7042 is hinged with the lifting and pressing slider 7041. Specifically, the end of the lifting and pressing support 7042 close to the lifting and pressing driving crank 701 is provided with a U-shaped groove, and the lifting and pressing slider 7041 is hinged in the U-shaped groove. The lifting and pressing connecting rod 7044 is fixedly connected to the lifting and pressing support 7042, and the lifting and pressing connecting rod 7044 can slide through the lifting and pressing sliding sleeve 7043. The lifting and pressing sliding sleeve 7043 is fixedly arranged so that the lifting and pressing sliding sleeve 7043 guides the lifting and pressing connecting rod 7044 to slide up and down. The lifting rod 7045 is fixedly sleeved on the lifting and pressing connecting rod 7044, so that the lifting and pressing support 7042 drives the lifting rod 7045 to move through the lifting and pressing connecting rod 7044.

[0107] The outer side surface of the lifting rod 7045 is stepped and forms a limited boss. The lifting rod assembly 704 also includes a locking fastener 7046, a limiting nut 7047, a limiting roller 7048 and a limiting locking member 7049. The locking fastener 7046 is arranged on the lifting and pressing support 7042 and abuts against the lifting and pressing connecting rod 7044, so that the lifting and pressing support 7042 and the lifting and pressing connecting rod 7044 are fixedly connected. The locking fastener 7046 can also adjust the depth of the lifting and pressing connecting rod 7044 in the lifting and pressing support 7042 to adjust the lifting height of the lifting rod 7045. The limiting nut 7047 is sleeved on the end of the limiting shaft section of the lifting rod 7045. The limiting roller 7048 is sleeved on the limiting shaft section of the lifting rod 7045, and the two ends are respectively abutted against the limiting nut 7047 and the limiting boss to achieve axial limitation of the limiting roller 7048. The limiting locking member 7049 is disposed at one end of the lifting rod 7045 away from the limiting nut 7047 and abuts against the lifting and pressing connecting rod 7044, so that the lifting rod 7045 can be fixed on the lifting connecting rod under the joint extrusion of the limiting locking member 7049 and the limiting roller 7048, and the position of the lifting rod 7045 on the lifting connecting rod can be adjusted by twisting the limiting locking member 7049, and the lifting height of the lifting rod 7045 can be further adjusted so that the lifting rod 7045 can be hooked on the lifting hook 702 of the presser foot seat 703. Of course, the structure of the lifting rod assembly 704 is not limited to this.

[0108] The sewing machine further comprises a main driving mechanism 800 connected to the swing shaft 100, as shown in the attached Fig. 9 and 10As shown, the main driving mechanism 800 includes a main driving cam 801, a main driving roller 802, a main driving push rod 803, a support rod 804, a main driving bend and a swing shaft reset elastic member 806, wherein the main driving cam 801 is rotatably arranged. The main driving mechanism 800 also includes a main driving motor 807, and the main driving cam 801 is fixedly connected to the output shaft of the main driving motor 807, so that the main driving mechanism 800 drives the main driving cam 801 to rotate. The main driving cam 801 is against the outer cam surface 8011 of the main driving cam 801, and the outer cam surface 8011 of the main driving cam 801 is its outer side surface, which can be a disc cam. The main driving push rod 803 is fixedly connected to the main driving roller 802, and when the main driving roller 802 rolls along the lowest point of the main driving cam 801 to the highest point, the main driving push rod 803 moves up. When the main driving roller 802 rolls along the highest point of the main driving cam 801 to the lowest point, the main driving push rod 803 moves downward. The main driving push rod 803 can slide through the push rod guide sleeve 808, which is fixedly arranged. The push rod guide sleeve 808 is used to guide the main driving push rod 803 to move up and down. The top support rod 804 is against the main driving push rod 803, which can be a nut sleeve, but is not limited to this. The main driving crank 805 is fixedly connected between the top support rod 804 and the swing shaft 100, so that the main driving push rod 803 pushes the swing shaft 100 to swing through the top support rod 804. The main driving crank 805 and the top support rod 804 can be specifically fixedly connected together by connecting bolts. One end of the swing shaft reset elastic member 806 is fixedly arranged and the other end is fixedly connected to the swing shaft 100, which is used to assist the swing shaft 100 to quickly reset when the main driving roller 802 rolls along the highest point of the main driving cam 801 to the lowest point. The swing shaft reset elastic member 806 may specifically be a common cylindrical spring.

[0109] When the main driving cam 801 rotates clockwise, the main driving roller 802 rolls from the lowest point to the highest point along the outer cam surface 8011 of the main driving cam 801, the main driving push rod 803 pushes the top support rod 804 upward, and the main driving crank 805 pushes the swing shaft 100 to swing counterclockwise. Conversely, when the main driving cam 801 rotates counterclockwise, the swing shaft 100 swings clockwise.

[0110] In addition, the main driving push rod 803 is provided with an anti-deflection guide plate 809 away from the main driving roller 802 to prevent the center line of the main driving push rod 803 from deviating from the center line of the push rod guide sleeve 808, thereby ensuring that the main driving push rod 803 is coaxial with the push rod guide sleeve 808.

[0111] The above sewing machine also includes a thread trimming mechanism 900, as shown in the attached Fig.11As shown, the thread trimming mechanism 900 includes a thread trimming driving roller 901, a thread trimming driving crank 902, a thread trimming moving knife 903, a thread trimming connecting rod 904 and a thread trimming fixed knife 905. The thread trimming driving roller 901 is arranged on the cam groove 8012 of the main driving cam 801. The cam groove 8012 is arranged on the end surface of the main driving cam 801. The cam groove 8012 is formed by connecting a V-shaped groove and a circular arc groove. The thread trimming driving crank 902 can be rotatably sleeved on the crank shaft 9021. The crank shaft 9021 is fixedly arranged so that the thread trimming driving crank 902 can rotate around the crank shaft 9021. The thread trimming driving crank 902 is connected to the thread trimming driving roller 901 by a pin hinge. The thread trimming moving knife 903 can be rotatably sleeved on the moving knife shaft 9031. The moving knife shaft 9031 is fixedly arranged so that the thread trimming moving knife 903 can rotate around the moving knife shaft 9031. The thread trimming connecting rod 904 is connected between the thread trimming driving crank 902 and the thread trimming movable knife 903, and the thread trimming fixed knife 905 is fixedly arranged. Of course, the structure of the thread trimming mechanism 900 is not limited to this.

[0112] When the main driving cam 801 rotates clockwise, the thread trimming driving roller 901 moves from the initial position to the lowest position along the cam groove 8012, that is, when the thread trimming driving roller 901 rolls into the V-shaped groove of the cam groove 8012, the thread trimming driving crank 902 swings counterclockwise around the crank shaft 9021, and the thread trimming driving crank 902 pushes the thread trimming connecting rod 904 to move forward, and the thread trimming connecting rod 904 drives the thread trimming movable knife 903 to rotate counterclockwise around the movable knife shaft 9031, and the movable knife edge of the thread trimming movable knife 903 is tangent to the fixed knife edge of the thread trimming fixed knife 905 to achieve thread trimming.

[0113] It is particularly important to note that the two cam surfaces of the main driving cam 801 have different phase angles, so that the thread trimming mechanism 900 operates before the lifting and pressing mechanism 700, so as to achieve thread trimming first and then pressure adjustment, avoid pulling the face thread during lifting and pressing, and ensure that the thread ends cut from the face thread are short and neat. When the fabric is finished sewing, the main driving cam 801 first drives the thread trimming mechanism 900 to perform the thread trimming action, and then drives the thread sweeping mechanism 200, the thread beating mechanism 400 and the lifting and pressing mechanism 700 to act synchronously through the swing shaft 100, so that the main driving cam 801 can achieve one-to-four, that is, the main driving cam 801 can continuously perform the four actions of thread trimming, thread sweeping, thread beating and lifting and pressing when it rotates one circle, and each mechanism does not need to be separately configured with electromagnets and other driving parts, so that the whole machine works more reliably, saves costs, and makes the whole machine structure more compact.

[0114] The thread trimming link 904 includes a thread trimming rear link 9041, a thread trimming middle link 9042 and a thread trimming front link 9043 which are connected in sequence. A length adjustment component 906 is provided between any two of the three connected links, as shown in the attached Fig.12As shown, the length adjustment component 906 includes a waist-shaped adjustment hole 9061 provided on any one of the two connected parts and at least one adjustment fastener 9062 passing through the waist-shaped adjustment hole 9061 and connected to the other part, so that the length of the thread trimming connecting rod 904 can be adjusted, thereby adjusting the bite timing of the thread trimming movable knife 903 and the thread trimming fixed knife 905, that is, adjusting the thread trimming timing of the thread trimming mechanism 900, increasing the thread trimming stability, and adjusting the thread trimming timing without flipping the machine head, which is more convenient. Specifically, the thread trimming middle connecting rod 9042 is provided with a waist-shaped adjustment hole 9061, and two adjustment fasteners 9062 are inserted into the waist-shaped adjustment hole 9061, and the two adjustment fasteners 9062 are respectively fixedly connected to the thread trimming front connecting rod 9043.

[0115] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0116] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sewing machine, characterized in that: The invention comprises a swing shaft (100), a line-sweeping mechanism (200), and a conversion mechanism (300) connected between the swing shaft (100) and the line-sweeping mechanism (200), wherein the conversion mechanism (300) comprises: A sweeping line driving crank (301) fixedly connected to the swing shaft (100); A line sweeping slider (302) slidably arranged and vertically connected to the line sweeping driving crank (301); A sweeping line linkage shaft (303) perpendicular to the swing shaft (100); A first wire-sweeping linkage crank (304) fixedly connected to the wire-sweeping linkage shaft (303); A wire-sweeping connecting rod (305) is hinged between the wire-sweeping sliding block (302) and the first wire-sweeping linkage crank (304).

2. The sewing machine according to claim 1, characterized in that: The conversion mechanism (300) further comprises a wire sweeping connection block (306) connected between the wire sweeping slider (302) and the wire sweeping driving crank (301); the wire sweeping connection block (306) is provided with a sliding connection column (3061) and a fixed connection hole (3062); the sliding connection column (3061) is slidably connected to the wire sweeping driving crank (301), and the fixed connection hole (3062) is fixedly connected to the wire sweeping slider (302).

3. The sewing machine according to claim 1, characterized in that: The conversion mechanism (300) further comprises a second line-sweeping linkage crank (307) fixedly connected to the line-sweeping linkage shaft (303), and the line-sweeping mechanism (200) comprises: A wire sweeping connecting plate (201) that can be rotatably arranged; A wire sweeping pull rod (203) having one end hinged to the second wire sweeping linkage crank (307) and the other end slidably connected to the wire sweeping connection plate (201) via a sliding connection pin (202); A wire sweeping rod (204) rotatably arranged; A wire sweeping pull plate (205) hinged between the wire sweeping connecting plate (201) and the wire sweeping rod (204); A wire-sweeping resetting elastic member (206) is connected between the wire-sweeping pull rod (203) and the sliding connecting pin (202) and is used to assist the wire-sweeping pull rod (203) in resetting.

4. The sewing machine according to any one of claims 1 to 3, characterized in that: Also includes: A wire-beating mechanism (400), a first wire-clamping driving cam (501), and a second wire-clamping driving cam (502) respectively fixed to the swing shaft (100); a first thread clamp (601) abutting against the first thread clamp driving cam (501); a second thread clamp (602) abutting against the second thread clamp driving cam (502); When the swing shaft (100) swings, the thread-beating mechanism (400), the first thread-clamping driving cam (501) and the second thread-clamping driving cam (502) are synchronously driven with the swing shaft (100), the thread-beating mechanism (400) swings to beat the thread, the highest point of the first thread-clamping driving cam (501) abuts against the first thread clamp (601) to push open the first thread clamp (601) to loosen the thread, and the lowest point of the second thread-clamping driving cam (502) abuts against the second thread clamp (602) to clamp the thread.

5. The sewing machine according to any one of claims 1 to 3, characterized in that: It also includes a lifting and pressing mechanism (700) fixedly arranged on the swing shaft (100), and the lifting and pressing mechanism (700) includes: A lifting and pressing driving crank (701) fixedly mounted on the swing shaft (100); A presser foot seat (703) having a lifting hook (702) and being rotatably arranged; A lifting rod group (704) which is slidably arranged and has one end connected to the lifting and pressing driving crank (701) and the other end hung on the lifting hook (702); A lifting and pressing resetting elastic member (705) with one end fixedly arranged and the other end abutting against the presser foot seat (703); When the swing shaft (100) swings, the lifting and pressing driving crank (701) swings along with the swing shaft (100), and the lifting and pressing driving crank (701) lifts the presser foot seat (703) via the lifting rod group (704) to achieve presser foot lifting; When the swing shaft (100) is reset, the lifting and pressing reset elastic member (705) pushes the presser foot seat (703) to move downward and reset.

6. The sewing machine according to claim 5, characterized in that The lifting rod assembly (704) comprises: A lifting and pressing slider (7041) slidably disposed in a lifting and pressing slide groove (7011) disposed on the lifting and pressing driving crank (701); A lifting and pressing support (7042) hingedly connected to the lifting and pressing sliding block (7041); A lifting and pressing connecting rod (7044) fixedly connected to the lifting and pressing support (7042) and capable of sliding through a fixedly arranged lifting and pressing sliding sleeve (7043); A lifting rod (7045) is fixedly sleeved on the lifting and pressing connecting rod (7044).

7. The sewing machine according to claim 6, characterized in that The outer side surface of the lifting rod (7045) is stepped and forms a limited position boss, and the lifting rod assembly (704) further includes: A locking fastener (7046) disposed on the lifting and pressing support (7042) and abutting against the lifting and pressing connecting rod (7044); A limiting nut (7047) sleeved on the limiting shaft section of the lifting rod (7045); A limiting roller (7048) sleeved on the limiting shaft section of the lifting rod (7045) and with two ends respectively abutting against the limiting nut (7047) and the limiting boss; A limiting locking member (7049) is provided at one end of the lifting rod (7045) away from the limiting nut (7047) and abuts against the lifting and pressing connecting rod (7044).

8. The sewing machine according to any one of claims 1 to 3, characterized in that: It also includes a main drive mechanism (800) fixedly connected to the swing shaft (100), and the main drive mechanism (800) includes: A main driving cam (801) rotatably arranged; A main driving roller (802) abutting against an outer cam surface (8011) of the main driving cam (801); A main driving push rod (803) fixedly connected to the main driving roller (802) and slidably arranged; A supporting rod (804) abutting against the main driving rod (803); A main driving crank (805) fixedly connected between the top support rod (804) and the swing shaft (100); A swing shaft resetting elastic member (806) is fixedly arranged at one end and is fixedly connected to the swing shaft (100) at the other end, and is used to assist in resetting the swing shaft (100).

9. The sewing machine according to claim 8, characterized in that It also includes a thread cutting mechanism (900), wherein the thread cutting mechanism (900) includes: a thread trimming driving roller (901) disposed in the cam groove (8012) of the main driving cam (801); A thread trimming drive crank (902) rotatably arranged and connected to the thread trimming drive roller (901); A thread cutting movable knife (903) that can be rotatably arranged; A thread cutting connecting rod (904) connected between the thread cutting driving crank (902) and the thread cutting movable knife (903); A fixed thread trimming knife (905); When the thread trimming driving roller (901) moves from the initial position to the lowest position along the cam groove (8012), the thread trimming driving crank (902) drives the thread trimming movable knife (903) to rotate relative to the thread trimming fixed knife (905) through the thread trimming connecting rod (904) to achieve thread trimming.

10. The sewing machine according to claim 9, characterized in that The thread trimmer link (904) comprises a thread trimmer rear link (9041), a thread trimmer middle link (9042) and a thread trimmer front link (9043) which are connected in sequence, and a length adjustment component (906) is provided between any two of the three connected links, and the length adjustment component (906) comprises a waist-shaped adjustment hole (9061) provided on one of the two connected links and at least one adjustment fastener (9062) passing through the waist-shaped adjustment hole (9061) and connected to the other link.

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