CN115369583A

CN115369583A - Sewing machine

Info

Publication number: CN115369583A
Application number: CN202110538783.9A
Authority: CN
Inventors: 林子春; 潘林勇; 李质彬; 刘霖; 刘冰
Original assignee: Qixing Intelligent Technology Co Ltd
Current assignee: Qixing Intelligent Technology Co Ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-11-22
Also published as: WO2022242094A1

Abstract

The application provides a sewing machine, in particular to the technical field of sewing machine manufacturing, and the sewing machine is provided with a cloth feeding mechanism, a thread cutting mechanism, a presser foot lifting mechanism and a control system, wherein the cloth feeding mechanism is provided with a cloth feeding driving source and a feed lifting tooth driving source, and the cloth feeding mechanism is driven by the cloth feeding driving source and the feed lifting tooth driving source to realize the cloth feeding function of the sewing machine; the thread cutting mechanism and the presser foot lifting mechanism are provided with thread cutting and presser foot lifting driving sources; the output shaft of the thread cutting and presser foot lifting driving source is connected with the thread cutting mechanism and the presser foot lifting mechanism to perform thread cutting and presser foot lifting actions, and after the sewing machine finishes the needle work, the thread cutting and presser foot lifting driving source uses the front output shaft and the rear output shaft of the thread cutting and presser foot lifting driving source to sequentially perform the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times, so that a preset program of a control system of the cloth feeding mechanism is separated from the thread cutting and presser foot lifting, the intelligent control level of the sewing machine is effectively improved, and the thread cutting and presser foot lifting driving source has high use and popularization values.

Description

Sewing machine

Technical Field

The application provides a sewing machine, concretely relates to sewing machine makes technical field.

Background

As a sewing tool, various sewing stitches and stitch lengths need to be preset in a program. The company has previously proposed the invention patent of a driving device for trimming, lifting and pressing a foot and adjusting the needle pitch in a sewing machine, wherein the scheme comprises the following components: when the driving device is used specifically, the motor rotates according to the setting, and the thread cutting crank and the pressure lifting cam rotate synchronously along with the rotating shaft of the motor to complete corresponding actions. When the needle pitch needs to be adjusted, when the motor rotating shaft rotates until the raised head on the pressure lifting cam abuts against the swinging working surface, the pressure lifting cam exerts acting force on the swinging working surface through the raised head so as to push the transmission member to swing, and the transmission member drives the swinging seat to swing through the connecting rod so as to adjust the needle pitch. The different positions of the raised heads on the swinging working surfaces mean different needle pitch values, and the arrangement of the two swinging working surfaces ensures that the driving device can adjust the positive needle pitch or the negative needle pitch as required, the positive sewing can be realized when the needle pitch is positive, and the reverse sewing can be realized when the needle pitch is negative. In the process of adjusting the needle pitch by moving the raised head along the swinging working surface, the matching head is separated from the thread shearing working surface to keep the thread shearing mechanism still, and the presser foot lifting idle stroke surface is abutted against the swing rod to keep the presser foot lifting mechanism still. According to the scheme, the needle pitch is adjusted by changing the position of the raised head through the rotation of the rotating shaft of the motor, however, when the needle pitch of the sewing machine needs to be changed, the pressure lifting cam and the raised head need to be replaced, one sewing machine often only uses the needle pitch set in a factory, the sewing requirement that the sewing varieties are increased day by day cannot be met, and the needle pitch and the procedures of trimming and lifting the presser foot need to be debugged on one motor.

Disclosure of Invention

The present application proposes to solve at least one of the above-mentioned technical problems, and particularly to a sewing machine having a cloth feeding mechanism, a thread trimming mechanism, a presser foot lifting mechanism and a control system, wherein the cloth feeding mechanism has a cloth feeding driving source and a feed lifting driving source, and the cloth feeding mechanism is driven by the cloth feeding driving source and the feed lifting driving source to realize a cloth feeding function of the sewing machine; the thread cutting mechanism and the presser foot lifting mechanism are provided with thread cutting and presser foot lifting driving sources; the output shaft of the thread cutting and presser foot lifting driving source is connected with the thread cutting mechanism and the presser foot lifting mechanism to execute the actions of thread cutting and presser foot lifting.

Preferably, after the sewing machine finishes the needle work, the thread cutting and presser foot lifting driving source uses the front and rear output shafts to successively execute the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times.

Preferably, the cloth feeding mechanism has an up-down transfer assembly and a front-rear transport assembly.

Preferably, the up-and-down transfer assembly comprises a tooth frame, a first swing disc, a second swing disc, a circular sliding component and a tooth lifting driving source, wherein a cloth feeding tooth is fixed at the upper part of the tooth frame, a shuttle core abdicating cavity is arranged in the middle of the tooth frame, sliding chutes are respectively arranged at two sides of the tooth frame, the first swing disc and the second swing disc are matched on the sliding chutes at two sides of the tooth frame, the first swing disc and the second swing disc are hinged through a connecting rod, the circular sliding component is further arranged between the sliding chutes of the tooth frame by the first swing disc and the second swing disc, the up-and-down transfer assembly further comprises a limiting frame which has the function of limiting the moving position of the tooth frame, the tooth lifting driving source is installed on the static adjusting bracket, a front output shaft of the tooth lifting driving source penetrates through the static adjusting bracket and is fixedly connected with the first swing disc, the tooth lifting driving source is driven to transmit the first swing disc to perform the rotary motion, the second swing disc under the dynamic connection of the connecting rod also performs the rotary motion same as the first swing disc to the swing disc, and the second swing disc is movably connected to the fixed limiting plate, so that the tooth frame performs the up-and down transfer motion to the cloth feeding tooth.

Preferably, the front and rear transport unit includes a rack, an insert rod, a front and rear cloth feeding swing unit, and a cloth feeding drive source, and the rack is further provided with a positioning groove for inserting and matching the insert rod and transmitting a swing motion from the cloth feeding drive source to cause the rack and thus the cloth feeding dog to perform a front and rear transfer motion.

Preferably, the front and back work feed swing assembly comprises a follow-up plate, a fixed limiting plate, a sliding part, a connecting shaft, an inserting rod, an outer rotating plate, an inner sliding plate and a moving groove formed in the static adjusting support, a shaft hole for fixedly connecting a work feed driving source is formed in the outer rotating plate, the inner sliding plate is matched in the outer rotating plate, one end of the inner sliding plate is connected with the sliding part, the other end of the inner sliding plate is connected with the connecting shaft, the upper end of the follow-up plate is fixedly connected with the inserting rod, a bearing is arranged between the follow-up plate and the connecting shaft in a movable connection mode, the other end of the inserting rod is matched with a positioning groove of a dental articulator, the fixed limiting plate is arranged between the dental articulator and the follow-up plate, and the inserting rod penetrates through a limiting part which the fixed limiting plate is provided with.

Preferably, the sliding part is configured and operated in an operation groove of the static adjusting bracket, the operation groove is provided with a needle pitch groove, a transition first groove, a transition second groove, a thread cutting groove and a pressure lifting foot groove, the needle pitch groove is positioned between the transition first groove and the transition second groove, the needle pitch groove is opposite to the thread cutting groove and the pressure lifting foot groove, the needle pitch groove, the thread cutting groove and the pressure lifting foot groove are all arc-shaped, the needle pitch groove, the thread cutting groove and the pressure lifting foot groove are arranged on the same circle center, the circle center of the operation groove is provided with a shaft hole fixed with a cloth feeding driving source, the operation groove is a closed-loop groove for the sliding part to operate in a surrounding manner,

preferably, the cloth feeding driving source enters the sliding piece into the thread trimming groove from the needle pitch groove through the transition two grooves, so that the connecting shaft is concentric with the front output shaft of the cloth feeding driving source, and at the moment, the cloth feeding driving source does not apply up-and-down movement to the connecting shaft.

Preferably, the thread cutting mechanism is provided with a thread cutting fork wheel, a thread cutting crank and a thread cutting end execution end, the thread cutting fork wheel is provided with a thread cutting rod and a return rod, the thread cutting fork wheel is fixedly installed on an output shaft in front of the thread cutting and presser foot lifting driving source, an action rod is arranged at an eccentric position of the thread cutting crank and is located between the thread cutting rod and the return rod, and after thread cutting is completed, the thread cutting and presser foot lifting driving source drives the thread cutting rod to continuously operate until the action rod is used for enabling the whole thread cutting mechanism to return.

Preferably, the presser foot lifting mechanism has a presser foot lifting cam and a presser foot lifting ejector rod, the presser foot lifting cam is mounted on the rear output shaft of the trimming and presser foot lifting drive source, a cam portion of the presser foot lifting cam acts on the presser foot lifting ejector rod, and the presser foot lifting ejector rod performs a presser foot lifting action on the presser foot lifting cam.

Preferably, the thread trimming mechanism and the presser foot lifting mechanism are respectively connected to a thread trimming and presser foot lifting driving source and are arranged on an output shaft at one end, when the action rod completes thread trimming under the rotating action of the thread trimming and presser foot lifting driving sources on the thread trimming rod, the presser foot lifting cam rotates to execute a presser foot lifting action, and the thread trimming rod completes the returning action of the whole thread trimming mechanism under the rotating action of the action rod.

A sewing machine of the present application has a control system that controls the sewing machine, which performs and implements the above-mentioned stitch length adjustment.

Compared with the prior art, the cloth feeding mechanism of the brand-new sewing machine has the cloth feeding driving source and the feed lifting driving source, and the cloth feeding mechanism is driven by the cloth feeding driving source and the feed lifting driving source to realize the cloth feeding function of the sewing machine; the thread cutting mechanism and the presser foot lifting mechanism are provided with thread cutting and presser foot lifting driving sources; the output shaft of the thread cutting and presser foot lifting driving source is connected with the thread cutting mechanism and the presser foot lifting mechanism to perform thread cutting and presser foot lifting actions, and after the sewing machine finishes the needle work, the thread cutting and presser foot lifting driving source uses the front and rear output shafts of the thread cutting and presser foot lifting driving source to sequentially perform the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times, so that a preset program of a control system of the cloth feeding mechanism is separated from the thread cutting and presser foot lifting, the intelligent control level of the sewing machine is effectively improved, and the sewing machine has higher use and popularization values.

Drawings

FIG. 1 is a schematic view of a mounting position of a driving source of a sewing machine according to the present application;

FIG. 2 is a front view of a cloth feed mechanism of a sewing machine of the present application;

FIG. 3 is a partially exploded view of a cloth feeding mechanism of a sewing machine according to the present application;

FIG. 4 is a schematic view of a spacing portion and an inner slide attachment of a sewing machine according to the present application;

FIG. 5 is a view showing a mounting structure of a thread guide and a feed dog of a sewing machine according to the present application;

FIG. 6 is a structural view of a static adjusting bracket of a sewing machine according to the present application;

FIG. 7 is a schematic view of a first and second swing plate of a sewing machine according to the present application;

FIG. 8 is a schematic view of a run channel of a sewing machine of the present application;

FIG. 9 is a schematic view of a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine according to the present application.

Reference numerals are as follows: the cloth feeding mechanism 10, the cloth feeding driving source 11, the feed lifting driving source 12, the swing disc I121, the swing disc II 122, the connecting rod 123, the circular sliding member 124, the gripper 13, the bobbin abdicating cavity 131, the sliding groove 132, the positioning groove 133, the feed lifting gripper 14, the front and rear cloth feeding swing assembly 15, the follower plate 151, the fixed limiting plate 152, the limiting portion 1521, the sliding member 153, the outer rotating plate 154, the inner sliding plate 155, the connecting shaft 156, the inserting rod 157, the limiting frame 16, the static adjusting bracket 21, the operating groove 211, the stitch length groove 212, the zero point 2121, the transition first groove 213, the transition second groove 214, the thread cutting groove 215, the pressure lifting groove 216, the thread cutting and lifting driving source 20, the pressure lifting pin mechanism 30, the pressure lifting cam 31, the pressure lifting pin 32, the thread cutting mechanism 40, the thread cutting fork wheel 41, the return rod 411, the thread cutting rod 412, the thread cutting crank 42 and the thread cutting end executing end 43.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to the accompanying fig. 1-9, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be more clearly defined, and these embodiments are only used for illustration of the present invention, and are not limited to the present invention.

Fig. 1 is an overall configuration diagram of a sewing machine according to the present application, which has a cloth feeding mechanism 10, a thread cutting mechanism 40, a presser foot lifting mechanism 30, and a control system. The cloth feeding mechanism 10 includes a cloth feeding drive source 11 and a feed lifting drive source 12; the thread cutting mechanism 40 and the presser foot lifting mechanism 30 are provided with thread cutting and presser foot lifting drive sources 20, and the cloth feeding mechanism 10 is driven by a cloth feeding drive source 11 and a tooth lifting drive source 12; the thread cutting mechanism 40 and the presser foot lifting mechanism 30 are driven by the thread cutting and presser foot lifting drive source 20. The cloth feeding driving source 11 and the feed lifting tooth driving source 12 drive the cloth feeding action of the cloth feeding mechanism 10, and the cloth feeding driving source 11 also performs the work of adjusting the needle pitch, when the sewing machine finishes the sewing work, the thread cutting mechanism 40 and the presser lifting foot mechanism 30 are driven by the thread cutting and presser lifting driving source 20 to perform the thread cutting action of the thread cutting mechanism 40 and the presser lifting action of the presser lifting foot mechanism 30, and the thread cutting and presser lifting driving source 20 uses the front and rear output shafts thereof to sequentially perform the thread cutting action of the thread cutting mechanism 40 and the presser lifting action of the presser lifting foot mechanism 30 at different time. The sewing machine of this application utilizes three driving source to realize sewing machine sewing work, has compact structure, and sewing machine's control system programming is simple, can quick volume production's advantage.

In fig. 1 to 8, a cloth feeding mechanism 10 of a sewing machine includes a feed dog 13, a feed dog 14 fixed to the feed dog 13, a front and rear feed swing block 15, a feed driving source 11, and a feed lifting driving source 12. The cloth feeding driving source 11 indirectly drives the tooth frame 13; the feed dog driving source 11 indirectly drives the tooth frame 13, and the feed dog driving source 12 directly drives the same tooth frame 13 to swing, so that the feed dog 14 integrated with the tooth frame 13 generates a sewing feed motion, and the feed dog driving source 11 and the feed dog driving source 12 realize power output by back and forth transfer. The above-described back-and-forth transfer rotation of the cloth feeding drive source 11 and the feed dog drive source 12 is based on the use of preferably a stepping motor or a servo motor, and thus the sewing operation can be efficiently controlled under the control of the control system. The sewing machine breaks the design idea of the traditional sewing machine, removes the original swing seat device, directly uses the motor to drive the tooth frame 13 and the cloth feeding teeth 14 to realize the sewing action, has a refined structure, completely controls the sewing action of the cloth feeding teeth 14 by the programming of a control system, adapts to the sewing requirements of different sewing stitches, and has higher technology and popularization and use values.

The cloth feeding mechanism 10 has an up-and-down transfer unit and a front-and-rear transport unit. The up-down transfer assembly includes a gripper 13, a first swing plate 121, a second swing plate 122, a circular sliding member 124, and a feed dog driving source 12, wherein a feed dog 14 is fixed to an upper portion of the gripper 13, a bobbin relief cavity 131 is provided in a middle portion of the gripper 13, and slide grooves 132 are provided on both sides of the gripper 13. The bobbin escape cavity 131 is used for the purpose of escape when a rotary shuttle is used in a sewing process. The sliding chutes 132 on both sides of the tooth rack 13 are matched with the first swing disk 121 and the second swing disk 122, the first swing disk 121 and the second swing disk 122 are hinged by the connecting rod 123, and the first swing disk 121 and the second swing disk 122 are further provided with the circular sliding member 124 between the sliding chutes 132 of the tooth rack 13. The up-down transfer assembly further has a limiting frame 16, and the limiting frame 16 has a function of limiting the moving position of the dental articulator 13. The feed dog driving source 12 is mounted on the static adjusting bracket 21, a front output shaft of the feed dog driving source 12 penetrates through the static adjusting bracket 21 and is fixedly connected with the first swinging disc 121, the feed dog driving source 12 drives and transmits to the first swinging disc 121 to perform a rotating action, the second swinging disc 122 under the movable connection of the connecting rod 123 performs the rotating action which is the same as that of the first swinging disc 121, so that the feed dog 13 and the feed dog 14 generate an up-and-down transferring action, and the second swinging disc 122 is movably connected on the fixed limit plate 152. Therefore, the synchronous operation of the swing plate 121 and the swing plate 122 is transferred back and forth by the feed dog driving source 12 to generate the vertical transfer motion of the tooth rack 13 and the feed dog 14.

The front and rear carrying unit includes a gripper 13, an insert bar 157, a front and rear cloth feeding swing unit 15, and a cloth feeding driving source 11. The tooth frame 13 is further provided with a positioning groove 133, the positioning groove 133 is used for inserting and matching the insertion rod 157 and transmitting the swinging motion from the cloth feeding driving source 11, namely, the cloth feeding driving source 11 is connected with the front and rear cloth feeding swinging assemblies 15 to carry and rotate the tooth frame 13 back and forth to perform corresponding swinging motion, and the tooth frame 13 and the cloth feeding teeth 14 are moved back and forth by the positioning groove 133. The positioning groove 133 of this embodiment is disposed on the second swing disk 122 side of the dental articulator 13, and the positioning groove 133 may be configured to transmit a swing motion.

The feed dog 14 of the feed dog frame 13 and the feed dog 14 thereof realize the feed function of the sewing machine under the combined action of the feed dog driving source 12 and the feed driving source 11, so that normal sewing is realized. The front and rear cloth feeding swing assembly 15 is a key component of the feed lifting driving source 12 for performing the front and rear cloth feeding operation, and is not limited to the following specific implementation, and all that is required for the assembly having the same function to cause the tooth rack 13 to perform the front and rear cloth feeding operation is the protection scope of the present application.

The front and rear cloth feeding swing assembly 15 comprises a follower plate 151, a fixed limit plate 152, a sliding member 153, a connecting shaft 156, an inserting rod 157, an outer rotating plate 154, an inner sliding plate 155 and a moving groove 211 arranged in a static adjusting bracket 21. The outer rotating plate 154 has a shaft hole to which the cloth feeding driving source 11 is fixedly connected, the inner sliding plate 155 is fitted inside the outer rotating plate 154, one end of the inner sliding plate 155 is connected to the sliding member 153, and the other end of the inner sliding plate 155 is connected to the connecting shaft 156. An insert rod 157 is fixedly connected to the upper end of the follower plate 151, and the follower plate 151 is movably connected to the connecting shaft 156, with a bearing interposed therebetween. The other end of the inserting rod 157 is matched with the positioning groove 133 of the dental articulator 13, the fixing limiting plate 152 is disposed between the dental articulator 13 and the follower plate 151, the inserting rod 157 penetrates through a limiting portion 1521 of the fixing limiting plate 152, and the limiting portion 1521 is used for limiting the operation range of the inserting rod 157 during operation.

Fig. 8 is a schematic view of the rotational angle of the motor of the cloth feeding mechanism of the present application, in combination with the other figures described above. The sliding member 153 is disposed and operated in the operation groove 211 of the static adjusting bracket 21, the operation groove 211 is a closed loop groove for the sliding member 153 to move around, and the operation groove 211 has a needle pitch groove 212, a transition first groove 213, a transition second groove 214, a thread cutting groove 215 and a presser foot lifting groove 216. The stitch length groove 212 is located between the first transition groove 213 and the second transition groove 214, the stitch length groove 212 is opposite to the thread trimming groove 215 and the presser foot lifting groove 216, the stitch length groove 212 has a stitch length adjusting function, and the thread trimming groove 215 and the presser foot lifting groove 216 have a function of positioning a zero point position, namely a function of positioning a zero stitch length of the feed dog 14, besides the thread trimming function and the presser foot lifting function of the stitch length groove, and the zero stitch length is the stitch length of the sewing machine and is zero. The stitch length groove 212, the thread trimming groove 215 and the presser foot lifting groove 216 are all arc-shaped, the stitch length groove 212, the thread trimming groove 215 and the presser foot lifting groove 216 are arranged on the same circle center, and a shaft hole fixed with the cloth feeding driving source 11 is arranged on the circle center.

The cloth feeding mechanism 10 further comprises a pitch adjusting mechanism including a follower plate 151, a fixed stopper plate 152, a slider 153, a connecting shaft 156, an insertion rod 157, an outer rotating plate 154, an inner sliding plate 155, a pitch groove 212, and a cloth feeding driving source 11. The slider 153 is located inside the pitch groove 212 having the circular arc-shaped cross section, and the cloth feeding drive source 11 indirectly drives the slider 153 located inside the pitch groove 212 in a reciprocating manner to adjust the pitch. Specifically, the cloth feeding driving source 11 drives the outer rotating plate 154 in a back-and-forth rotating manner, the outer rotating plate 154 drives the inner sliding plate 155 and the sliding member 153 thereof, so that the sliding member 153 passively operates in the arc-shaped pitch groove 212, the sliding member 153 swings back and forth in the pitch groove 212 to drive the inner sliding plate 155 to move up and down in the inner sliding plate 155, the inner sliding plate 155 drives the connecting shaft 156, and the connecting shaft 156 drives the follower plate 151 and the inserting rod 157 to change the original pitch of the teeth frame 13 and the cloth feeding teeth 14 to form a new pitch.

The center position of the cross section of the needle space groove 212 is a zero point 2121, the zero point 2121 is a zero needle space position of the sewing machine, the feed driving source 11 performs needle space adjustment by driving the needle space groove 212 to rotate back and forth, and the zero point 2121 is both a start position and an end position corresponding to an operation position where the feed driving source 11 performs needle space adjustment. The needle pitch adjustment process is that the cloth feeding driving source 11 has a start position and an end position, and the cloth feeding driving source 11 starts at the start position and ends at the start position, in other words, the needle pitch adjustment of the cloth feeding driving source 11 starts at the zero point 2121 and ends at the zero point 2121; the angle of the cloth feeding driving source 11 rotating to both sides at the zero point 2121 determines the size of the needle pitch, and the needle pitch increases as the back-and-forth rotation angle of the cloth feeding driving source 11 increases; the smaller the back and forth rotation angle is, the smaller the needle pitch is, the zero needle pitch of the sewing machine is when the back and forth rotation angle is zero implemented by the cloth feeding driving source 11, on the basis, the sewing machine can realize different needle pitch settings with different back and forth rotation angles according to the setting of the control system, different needle pitches need different needle pitch grooves 212 as in the prior art, the intelligent level of the needle pitch adjustment of the sewing machine is greatly improved, and the popularization and use value is higher.

The above-mentioned slide member 153 has an arc-shaped running groove in the pitch groove 212, and the running groove of the pitch groove 212 of the present embodiment may be a straight angle or a wave-shaped running groove, and the straight angle or the wave-shaped pitch groove 212 achieves the same technical effect as the pitch groove 212 of the arc surface when the cloth feeding driving source 11 is driven to rotate back and forth. The above-mentioned needle pitch adjustment is realized by executing a needle pitch adjustment command program by a control system provided in the present application.

Fig. 9 is a schematic view of a thread trimming mechanism 40 and a presser foot lifting mechanism 30 of a sewing machine according to the present invention, and includes a thread trimming mechanism 40, a presser foot lifting mechanism 30 for trimming and a presser foot lifting drive source 20. The sewing machine has a needle, and after the sewing machine finishes the needle work, the sewing machine needs to immediately perform the actions of firstly cutting the thread and then lifting the presser foot, and the thread cutting and the presser foot lifting driving source 20 execute the two sewing actions. The cloth feeding driving source 11 enters the sliding member 153 into the thread cutting groove 215 from the stitch length groove 212 through the transition double groove 214, so that the connecting shaft 156 is concentric with the front output shaft of the cloth feeding driving source 11, therefore, the thread cutting and presser foot lifting driving source 20 does not apply up-and-down movement to the connecting shaft 156 under the operation of the sliding member 153 in the thread cutting groove 215 and the presser foot lifting groove 216, in other words, the zero stitch length position of the cloth feeding dog 14 is determined by the operation of the sliding member 153 in the thread cutting groove 215 and the presser foot lifting groove 216, and no actual influence is generated on the tooth frame 13.

After the zero stitch length is determined, the thread cutting and presser foot lifting drive source 20 starts to perform the thread cutting operation. The thread cutting and presser foot lifting driving source 20 has an output shaft connected to drive the relevant components of the thread cutting mechanism 40 to perform thread cutting. The thread trimming mechanism 40 has a trimming fork wheel 41, a trimming crank 42, and a trimming end execution end 43. The thread cutting fork wheel 41 is provided with a thread cutting rod 412 and a return rod 411, the thread cutting fork wheel 41 is fixedly arranged on a front output shaft of the thread cutting and lifting presser foot driving source 20, an action rod 421 is arranged on the eccentric position of the thread cutting crank 42, and the action rod 421 is positioned between the thread cutting rod 412 and the return rod 411. The thread trimming rod 412 is driven by the thread trimming and presser foot lifting driving source 20 to push the thread trimming rod 412, so that the thread trimming fork wheel 41 drives the thread trimming end execution end 43 to execute thread trimming; after the thread trimming is completed, the thread trimming and presser foot lifting driving source 20 drives the thread trimming rod 412 to continue to operate until the action of the return rod 411 causes the whole thread trimming mechanism 40 to return.

After the above-described thread trimming operation is completed, the slider 153 is driven by the cloth feeding drive source 11 to move to the presser foot lifting groove 216 and position the zero-pitch position, and then the thread trimming and presser foot lifting drive source 20 performs the presser foot lifting operation. The presser foot lifting mechanism 30 has a presser foot lifting cam 31 and a presser foot lifting jack 32, and the presser foot lifting cam 31 is attached to the rear output shaft of the thread trimming and presser foot lifting drive source 20. The cam portion of the pressure raising cam 31 acts on the pressure raising pin 32, and the pressure raising pin 32 performs a pressure raising operation on the pressure raising cam 31.

The thread cutting mechanism 40 and the presser foot lifting mechanism are respectively connected to the front and rear output shafts of the double-head output shaft of the thread cutting and presser foot lifting driving source 20, and can also be arranged on the single-head output shaft, and the realization mode and the effect are the same. When the action lever 421 completes the thread trimming by being driven by the thread trimming lever 412 by the rotary action of the thread trimming and presser foot lifting drive source 20, the presser foot lifting cam 31 is rotated to perform the presser foot lifting action, and the thread trimming lever 412 completes the returning action of the whole thread trimming mechanism 40 by the rotary action of the action lever 421.

The above description is only one of the preferred embodiments of the present application, and not intended to limit the scope of the present application, and all modifications that can be made to the equivalent structure or equivalent flow path by using the shape, structure and principle of the present application and the accompanying drawings, or applied to other related fields directly or indirectly are included in the scope of the present application.

Claims

1. A sewing machine is provided with a cloth feeding mechanism (10), a thread trimming mechanism (40) and a presser foot lifting mechanism (30), and is characterized in that the cloth feeding mechanism (10) is provided with a cloth feeding driving source (11) and a tooth lifting driving source (12), and the cloth feeding mechanism (10) is driven by the cloth feeding driving source (11) and the tooth lifting driving source (12) to realize the cloth feeding function of the sewing machine; the thread cutting mechanism (40) and the presser foot lifting mechanism (30) are provided with thread cutting and presser foot lifting driving sources (20); an output shaft of the thread cutting and presser foot lifting driving source (20) is connected with the thread cutting mechanism (40) and the presser foot lifting mechanism (30) to execute the thread cutting and presser foot lifting actions.

2. The sewing machine of claim 1, wherein the thread cutting and presser foot lifting drive source (20) successively performs the thread cutting operation of the thread cutting mechanism (40) and the presser foot lifting operation of the presser foot lifting mechanism (30) at different times by using front and rear output shafts provided therein after the sewing machine finishes the needle operation.

3. The sewing machine according to claim 1, wherein the cloth feed mechanism (10) has an up-and-down transfer assembly and a forward-and-backward transport assembly.

4. The sewing machine according to claim 4, wherein the vertical transfer assembly has a rack (13), a first swing disk (121), a second swing disk (122), a circular sliding member (124) and a feed dog driving source (12), the upper portion of the rack (13) is fixed with a feed dog (14), the middle portion of the rack (13) is provided with a bobbin abdicating cavity (131), two sides of the rack (13) are respectively provided with a sliding slot (132), the sliding slots (132) at the two sides of the rack (13) are matched with the first swing disk (121) and the second swing disk (122), the first swing disk (121) and the second swing disk (122) are hinged by a connecting rod (123), the first swing disk (121) and the second swing disk (122) are further provided with the circular sliding member (124) between the sliding slots (132) of the rack (13), the vertical transfer assembly further has a limiting frame (16), the limiting frame (16) has a function of limiting the moving position of the rack (13), the feed dog driving source (12) is mounted on the adjusting bracket (21), the first swing disk (121) is fixedly connected with the swing disk (121) and the swing driving source (121) and is connected with the swing disk (121) for rotating back and forth, the second swing disc (122) is movably connected to the fixed limit plate (152) so that the tooth rack (13) and the cloth feeding teeth (14) generate up-and-down movement.

5. The sewing machine according to claim 4, wherein the front and rear carrying means has a rack (13), an insert rod (157), a front and rear cloth feed oscillating means (15) and a cloth feed driving source (11), the rack (13) is further provided with a positioning groove (133), and the positioning groove (133) is used for the insert rod (157) to be inserted and matched and transmits the oscillating motion from the cloth feed driving source (11) to generate the front and rear moving motion of the rack (13) and the cloth feed dog (14).

6. The cloth feeding mechanism of the sewing machine as claimed in claim 3, wherein the front and rear cloth feeding swing assembly (15) comprises a follower plate (151), a fixed limit plate (152), a sliding member (153), a connecting shaft (156), an insert rod (157), an outer rotating plate (154), an inner sliding plate (155), and a running groove (411) formed in the static adjusting bracket (41), the outer rotating plate (154) is provided with a shaft hole for fixedly connecting the cloth feeding driving source (11), the inner sliding plate (155) is matched in the outer rotating plate (154), one end of the inner sliding plate (155) is connected with the sliding member (153), the other end of the inner sliding plate (155) is connected with the connecting shaft (156), the upper end of the follower plate (151) is fixedly connected with the insert rod (157), a bearing is arranged between the follower plate (151) and the connecting shaft (156) in a movable manner, the other end of the insert rod (157) is matched with a positioning groove (133) of the retainer (13), the fixed limit plate (152) is arranged between the retainer plate (13) and the follower plate (151), and the insert rod (157) is provided with a limit plate (1521) penetrating through the fixed limit plate (152).

7. The sewing machine according to claim 5, wherein the sliding member (153) is disposed and operated in a moving groove (211) of the static adjusting bracket (21), the moving groove (211) has a pitch groove (212), a transition first groove (213), a transition second groove (212), a thread cutting groove (215) and a presser foot lifting groove (216), the pitch groove (212) is located between the transition first groove (213) and the transition second groove (212), the pitch groove (212) is opposite to the thread cutting groove (215) and the presser foot lifting groove (216), the pitch groove (212), the thread cutting groove (215) and the presser foot lifting groove (216) are all arc-shaped, the pitch groove (212), the thread cutting groove (215) and the presser foot lifting groove (216) are disposed on the same circle center, the moving groove (211) is provided with a shaft hole fixed to the cloth feeding driving source (11), and the moving groove (211) is a closed-loop groove for the sliding member (153) to operate around.

8. The sewing machine of claim 4, wherein the feed drive source (11) moves the slider (153) from the pitch groove (412) through the transition groove (414) into the trimming groove (415) such that the connecting shaft (156) is concentric with the front output shaft of the feed drive source (11), and the feed drive source (11) does not apply up-and-down movement to the connecting shaft (156).

9. The sewing machine according to claim 1, characterized in that the thread cutting mechanism (40) comprises a thread cutting fork wheel (41), a thread cutting crank (42) and a thread cutting end execution end (43), the thread cutting fork wheel (41) comprises a thread cutting rod (412) and a return rod (411), the thread cutting fork wheel (41) is fixedly arranged on a front output shaft of the thread cutting and presser foot lifting drive source (20), an action rod (421) is arranged at an eccentric position of the thread cutting crank (42), the action rod (421) is positioned between the thread cutting rod (412) and the return rod (411), and after the thread cutting is completed, the thread cutting and presser foot lifting drive source (20) drives the thread cutting rod (412) to continue to operate until the return rod (411) is acted to enable the whole thread cutting mechanism (40) to return.

10. The sewing machine according to claim 1, wherein the presser foot lifting mechanism (30) has a presser foot lifting cam (31) and a presser foot lifting ram (32), the presser foot lifting cam (31) is attached to a rear output shaft of the thread trimming and presser foot lifting drive source (20), a cam portion of the presser foot lifting cam (31) acts on the presser foot lifting ram (32), and the presser foot lifting ram (32) performs a presser foot lifting operation on the presser foot lifting cam (31).

11. The sewing machine according to claim 9 or 10, characterized in that the thread trimming mechanism (40) and the presser foot lifting mechanism are respectively connected to a thread trimming and presser foot lifting driving source (20) and are arranged on an output shaft, when the action rod (421) completes thread trimming under the driving of the thread trimming rod (412) acted by the rotation of the thread trimming and presser foot lifting driving source (20), the presser foot lifting cam (31) rotates to perform presser foot lifting action, and the thread trimming rod (412) completes the whole thread trimming mechanism (40) returning action under the rotation action of the action rod (421).