WO2022242094A1

WO2022242094A1 - Sewing machine

Info

Publication number: WO2022242094A1
Application number: PCT/CN2021/133927
Authority: WO
Inventors: 林子春; 李质彬; 潘林勇; 刘霖; 刘冰
Original assignee: 琦星智能科技股份有限公司
Priority date: 2021-05-18
Filing date: 2021-11-29
Publication date: 2022-11-24
Also published as: CN115369583A

Abstract

A sewing machine, comprising a cloth feeding apparatus (10), a thread cutting apparatus (40) and a presser foot lifting apparatus (30). The cloth feeding apparatus has a cloth feeding driving source (11) and a tooth lifting driving source (12). The thread cutting apparatus and the presser foot lifting apparatus have a rotating driving source (20). The cloth feeding apparatus is further integrated with a multi-purpose adjusting assembly, and the cloth feeding driving source may drive the multi-purpose adjusting assembly to adjust the stitch length before the action of a needle, so as to ensure that the stitch length is adjusted in place before the action of the needle. Once the needle work is complete, the thread cutting apparatus and the presser foot lifting apparatus are driven by the rotating driving source to perform a thread cutting action and a presser foot lifting action in sequence. The sewing machine significantly optimizes the cooperating work capabilities of the apparatuses, and at the same time has the characteristics of a simplified structure and coherent action.

Description

a sewing machine

technical field

The present application relates to the technical field of sewing machine manufacturing, in particular to a sewing machine.

Background technique

As a sewing tool, the sewing machine needs to be pre-set in programs for various sewing stitches and stitch lengths. Our company previously proposed the invention patent of the driving device for thread trimming, presser foot lifting and stitch length adjustment in the sewing machine. The cam rotates synchronously with the motor shaft and completes corresponding actions. When the needle pitch needs to be adjusted, when the rotating shaft of the motor rotates until the convex head on the lifting cam touches the swinging working surface, the lifting and pressing cam exerts force on the swinging working surface through the convex head, thereby pushing the transmission part to swing, and the transmission The part drives the swing seat to swing through the connecting rod to adjust the needle distance. The different positions of the convex head on the oscillating working surface mean different stitch length values, and the setting of the two oscillating working surfaces enables the drive device to adjust the positive stitch length or the reverse stitch length as required. Positive sewing can be realized, and reverse sewing can be realized when the stitch length is negative. When the convex head moves along the oscillating working surface to adjust the stitch distance, the matching head is separated from the thread trimming working surface so that the thread trimming mechanism remains stationary, and the idle travel surface of the presser foot abuts against the swing rod to keep the presser foot lifting mechanism in place. verb: move. The above solution adjusts the stitch length by changing the position of the protrusion through the rotation of the motor shaft. However, when the sewing machine needs to change the stitch length, the lifting cam and the protrusion need to be replaced. A sewing machine often only uses the factory-set stitch length and cannot To meet the increasing sewing needs of sewing varieties, the above-mentioned stitch length, thread trimming, and presser foot lifting procedures need to be debugged on one motor, which is relatively complicated.

For example, the Chinese patent document discloses "sewing machine stitch length adjustment mechanism and sewing machine with it", its announcement number "CN210712006U", including a driving part, a connecting rod part and a swing plate seat, the first end of the connecting rod part is connected with the driving part, The first end of the swing board seat is set towards the side where the presser foot of the sewing machine is located, the second end of the swing board seat is opposite to the first end of the swing board seat, and the second end of the swing board seat is connected to the second end of the connecting rod part. The two ends are connected, and the driving part can drive the connecting rod part to drive the swing plate seat to swing to adjust the needle pitch of the sewing machine. In the above sewing machine, by connecting the end of the oscillating plate seat far away from the sewing machine presser foot to the second end of the link part, the driving part drives the link part to drive the oscillating plate seat to swing to adjust the needle pitch of the sewing machine.

Contents of the invention

Aiming at the problem that the cloth feeding, thread trimming, presser foot lifting and stitch length adjustment processes are difficult to cooperate in the sewing machine adopting the scheme of adjustable stitch length in the prior art, this application discloses a sewing machine, which uses the rotary drive source and the cloth feeding The drive source controls the cloth feeding device, thread trimming device, and presser foot lifting device in coordination, and at the same time cooperates with the multi-purpose adjustment component added to the cloth feeding device to pre-adjust the needle distance to ensure that the needle distance is adjusted in place before the needle moves. After the needle work is completed, the thread trimming device and the presser foot lifting device operate sequentially, which significantly optimizes the collaborative work ability of each device of the sewing machine, and at the same time has the characteristics of simplified structure and coherent action.

A sewing machine, comprising a cloth feeding device for realizing the cloth feeding action, including a cloth feeding driving source; a thread trimming device, used for performing a thread trimming action after the needle work is completed, including a rotary driving source; a presser foot lifting device , lift the presser foot after the thread trimming action; wherein, the rotary power source can drive the thread trimming device and the presser foot lifting device to act sequentially; wherein, the cloth feeding device (10) is also integrated with multi-purpose adjustment Assemblies, the cloth feeding drive source can drive the multi-purpose adjustment assembly to adjust the needle distance before the needle moves. After the sewing machine finishes the work of the machine needle, the rotary drive source utilizes its front and rear output shafts to perform the thread trimming action of the thread trimming device and the presser foot lifting action of the presser foot lifting device successively at different times.

Preferably, the cloth feeding device has an up and down transfer mechanism and a front and rear transfer mechanism, and a tooth frame is arranged on the cloth feeding device. The up and down transfer mechanism has a rotary lifting assembly. The rotary lifting assembly includes a rotary lifting plate 1, a rotary lifting plate 2, an eccentric wheel and a driving source for lifting teeth. There is a bobbin relief cavity, and there are chutes on both sides of the tooth frame. The chute on both sides of the tooth frame is matched with the rotary lifting plate 1 and the rotary lifting plate 2. The rotary lifting plate 1 and the rotary lifting plate 2 are connected by connecting rods. Hinge, rotary lifting disc 1 and rotary lifting disc 2 are also equipped with eccentric wheels between the chutes of the tooth frame, and the up and down transfer mechanism also has a limit frame, which has the function of limiting the moving position of the tooth frame, and the drive source for tooth lifting Installed on the static adjustment bracket, the first drive shaft of the tooth-lifting drive source passes through the static adjustment bracket and is fixedly connected with the rotary lifting plate. The drive of the tooth-lifting drive source is transmitted to the rotary lifting plate. The second rotary lifting disc under the dynamic connection also makes the same reciprocating movement as the first rotary lifting disc, and the second rotary lifting disc is dynamically connected to the fixed limit plate, so that the tooth frame and even the cloth feeding dog produce an up and down movement.

Preferably, the front and rear conveying mechanism has tooth frame, insertion rod, front and rear cloth feeding swing assembly and cloth feeding driving source, and positioning groove is also provided on the tooth frame, and the positioning groove is used for inserting and fitting the above insertion rod and transmitting the cloth feeding driving source. The swinging action of the source makes the tooth frame and even the feeding dog move back and forth. The front and rear cloth feeding swing assembly drives the tooth frame to move back and forth through the insertion rod, and cooperates with the up and down movement of the tooth lifting drive source to jointly complete the composite driving of the cloth feeding device.

Preferably, the multi-purpose adjustment assembly includes a follower plate, a fixed limit plate, a slider, a connecting shaft, an insertion rod, an outer rotating plate, an inner sliding plate, and a running groove inside the static adjustment bracket. The rotating plate has a shaft hole for the fixed connection of the cloth feeding driving source. The inner sliding plate is matched with the inside of the outer rotating plate. There is a bearing between the rod, the follower plate and the connecting shaft. The other end of the insertion rod matches the positioning groove of the bracket. The fixed limit plate is located between the tooth bracket and the follower plate, and the insertion rod penetrates the fixed limit. The limiting portion of the plate.

Preferably, the slider is configured and runs in the running groove of the static adjustment bracket, the running groove has a needle distance groove section, a first transition groove section, a second transition groove section, a thread trimming groove section and a presser foot lifting groove section, The needle distance groove section is located between the first transition groove section and the second transition groove section. The segments are all in the shape of an arc, the needle distance groove segment, the thread trimming groove segment and the presser foot lifting groove segment are set on the same circle center, and the center of the running groove circle is provided with a shaft hole fixed with the cloth feeding driving source, and the running groove is A closed-loop groove for the sliding part to revolve around. The running groove divides its special cam-shaped contour into the above-mentioned groove segments with different functions, so that the sliding part can implement each function in sequence according to the sequence of the groove segments during the rotation of the running groove. The working process is compact in structure and smooth in action, and can ensure that various processes are implemented in place, and there will be no problem of operation failure, which can effectively improve the working stability of the sewing machine.

Preferably, the cloth feeding driving source enters the slider from the needle distance groove section through the second transition groove section to the thread trimming groove section, so that the connecting shaft is concentric with the first driving shaft of the cloth feeding driving source. At this time, the cloth feeding The drive source does not apply up and down motion to the connected axis.

Preferably, the thread-cutting device has a thread-cutting fork wheel, a thread-cutting crank and a thread-cutting end execution end. The thread-cutting fork wheel has a thread-cutting lever and a return lever. The thread-cutting fork wheel is installed and fixed on the first drive of the rotary drive source. On the shaft, an action rod is set at the eccentric position of the thread trimming crank, and the action rod is located between the thread trimming rod and the return rod. After the thread trimming is completed, the rotary drive source drives the thread trimming rod to continue to run until it acts on the return rod Make the whole thread trimming device return.

Preferably, the presser foot lifter has a presser lifter cam and a presser foot lifter rod, the lifter cam is installed on the output shaft of the rotary drive source, the cam part of the presser lifter cam acts on the presser foot lifter rod, and the presser lifter The foot pusher implements the action of lifting the presser foot on the lifting cam.

Preferably, the thread trimming device and the presser foot lifting device are respectively connected to the rotary drive source and arranged on an output shaft. Rotate to perform the action of lifting the presser foot, and the thread trimming lever completes the return action of the entire thread trimming device under the action of the rotation of the action lever.

A sewing machine according to the present application has a control system for controlling the sewing machine, and the control system executes and realizes the aforementioned stitch length adjustment.

Compared with the prior art, the cloth feeding device of the new sewing machine of the present application has a cloth feeding driving source and a tooth lifting driving source, and the cloth feeding device is driven by the cloth feeding driving source and the tooth lifting driving source to realize the cloth feeding function of the sewing machine; the thread cutting device and The presser foot lifting device has a rotary drive source; the output shaft of the rotary drive source is connected to the thread trimmer and the presser foot lifter to perform thread trimming and presser foot lifting actions. When the sewing machine finishes working with needles, the rotary drive source uses its front , the rear output shaft executes the thread trimming action of the thread trimming device and the presser foot lifting action of the presser foot lifting device successively, so that the pre-set program of the control system of the cloth feeding device is separated from the thread trimming and presser foot lifting, effectively improving the sewing machine. The level of intelligent control has a high value of use and promotion.

Description of drawings

Fig. 1 is a schematic diagram of the installation position of a driving source of a sewing machine of the present application;

Fig. 2 is a front view of a cloth feeding device of a sewing machine of the present application;

Fig. 3 is a partially exploded structure diagram of a cloth feeding device of a sewing machine of the present application;

Fig. 4 is a schematic diagram of the connection between the limiting part and the inner sliding plate of a sewing machine of the present application;

Fig. 5 is an installation structure diagram of a tooth frame and a cloth feed dog of a sewing machine of the present application;

Fig. 6 is a structural diagram of a static adjustment bracket of a sewing machine of the present application;

Fig. 7 is a structural schematic diagram of a rotary lifting disc 1 and a rotary lifting disc 2 of a sewing machine of the present application;

Fig. 8 is a schematic diagram of a running groove of a sewing machine of the present application;

Fig. 9 is a schematic diagram of a thread trimming device and a presser foot lifting device of a sewing machine of the present application.

Reference signs: cloth feeding device 10, cloth feeding driving source 11, tooth lifting driving source 12, rotary lifting plate one 121, rotary lifting plate two 122, connecting rod 123, eccentric wheel 124, tooth frame 13, bobbin relief chamber 131, chute 132, positioning groove 133, cloth feeding dog 14, front and rear cloth feeding swing assembly 15, follower plate 151, fixed limit plate 152, limit part 1521, slider 153, outer rotating plate 154, inner sliding plate 155, connecting shaft 156, insertion rod 157, limit frame 16, static adjustment bracket 21, running groove 211, needle distance groove section 212, zero point 2121, first transition groove section 213, second transition groove section 214, thread trimming groove Section 215, presser foot lifting groove section 216, rotary drive source 20, presser foot lifting device 30, lifting pressure cam 31, presser foot lifting rod 32, thread trimming device 40, thread trimming fork wheel 41, return lever 411, shear Wire rod 412, thread trimming crank 42, and thread trimming end execution end 43.

Detailed ways

The preferred embodiments of the present application will be described in detail below in conjunction with accompanying drawings 1-9, so that the advantages and features of the present application can be more easily understood by those skilled in the art, so as to make a clearer definition of the protection scope of the present application. These embodiments are only used to illustrate the present invention, not to limit the present invention.

Fig. 1 is an overall structural diagram of a sewing machine of the present application, the sewing machine has a cloth feeding device 10, a thread cutting device 40, a presser foot lifting device 30 and a control system. The above-mentioned cloth feeding device 10 has a cloth feeding driving source 11 and a tooth lifting driving source 12; Drive; thread trimmer 40 and presser foot lifter 30 are driven by rotary drive source 20 . In addition to driving the cloth feeding action of the cloth feeding device 10, the cloth feeding driving source 11 and the tooth lifting driving source 12 are also responsible for adjusting the needle pitch. When the sewing machine finishes sewing, it is driven by the rotary driving source 20. The thread trimming device 40 and the presser foot lifting device 30 perform the thread trimming action and the presser foot lifting action, and the rotary drive source 20 uses its front and rear output shafts to perform the thread trimming action of the thread trimming device 40 and the presser foot lifting device successively at different times. 30 of the presser foot lift action. The sewing machine of the present application utilizes three driving sources to realize the sewing work of the sewing machine, and has the advantages of compact structure, simple programming of the control system of the sewing machine, and rapid mass production.

In FIGS. 1 to 8 , the cloth feeding device 10 of the sewing machine includes a tooth frame 13 , a cloth feeding dog 14 fixed on the tooth frame 13 , a front and rear cloth feeding swing assembly 15 , a cloth feeding driving source 11 and a tooth lifting driving source 12 . The cloth feeding driving source 11 indirectly drives the tooth frame 13; while the cloth feeding driving source 11 indirectly drives the tooth frame 13, the tooth lifting driving source 12 directly drives the same tooth frame 13 to produce a swinging action, so that the tooth frame 13 is connected as a whole. The cloth feeding dog 14 produces the cloth feeding action for sewing, and the above-mentioned cloth feeding driving source 11 and the dog lifting driving source 12 are both reciprocating and rotating to realize power output. The reciprocating rotation of the above-mentioned cloth feeding drive source 11 and tooth lifting drive source 12 is based on preferably using a stepping motor or a servo motor, and thus can efficiently realize the control of the sewing action under the control of the control system. The sewing machine of the present application breaks the design concept of the traditional sewing machine, removes the original swing seat device, and directly uses the motor to drive the tooth frame 13 and the cloth feeding dog 14 to realize the sewing action. The sewing action of tooth 14 is completely controlled by the programming of the control system, which is suitable for the sewing needs of different sewing stitches, and has high technical and popularization value.

The cloth feeding device 10 has a vertical feeding mechanism and a forward and backward feeding mechanism. The up and down transfer mechanism has a tooth frame 13, a rotary lifting disc one 121, a rotary lifting disc two 122, an eccentric wheel 124 and a tooth lifting drive source 12. The upper part of the tooth frame 13 is fixed with a cloth feeding dog 14, and the middle part of the tooth frame 13 is provided with a The bobbin gives way to the cavity 131, and both sides of the tooth frame 13 are respectively provided with chute 132. The bobbin relief chamber 131 is used to make way for when using the rotary hook in the sewing process. The chute 132 on both sides of the tooth frame 13 is matched with a rotary lifting plate one 121 and a rotary lifting plate two 122, the rotary lifting plate one 121 and the rotary lifting plate two 122 are hinged by the connecting rod 123, the rotary lifting plate one 121, the rotary lifting plate The two 122 are engaged with the slide grooves 132 on both sides of the bracket 13 through the respective eccentric wheels 124 . The up and down transfer mechanism also has a limit frame 16, and the limit frame 16 has the effect of limiting the movable position of the tooth frame 13. The driving source 12 for lifting teeth is installed on the static adjustment bracket 21, the first drive shaft of the driving source 12 for lifting teeth passes through the static adjustment bracket 21 and is fixedly connected with the rotary lifting plate one 121, and the drive source 12 for lifting teeth transmits the drive to the rotary lifting Disk 1 121 is a reciprocating motion, and the rotary lifting disk 2 122 under the dynamic connection of the connecting rod 123 also performs the same reciprocating motion as the rotary lifting disk 1 121, so that the tooth frame 13 and even the cloth feeding dog 14 produce up and down movement. , where the two 122 rotary lifting discs are dynamically connected to the fixed limiting plate 152 . Therefore, under the reciprocating rotation of the tooth-lifting drive source 12, the synchronous operation of the rotary lifting plate 1 121 and the rotary lifting plate 2 122 makes the tooth frame 13 and even the cloth feeding dog 14 move up and down.

The front and rear conveying mechanism has tooth frame 13 , insertion rod 157 , front and rear cloth feeding swing assembly 15 and cloth feeding driving source 11 . The tooth frame 13 is also provided with a positioning groove 133, the positioning groove 133 is used for the insertion of the above-mentioned insertion rod 157 and the transmission of the swing action from the cloth feeding drive source 11, that is, the cloth feeding swing assembly 15 before and after the connection of the cloth feeding driving source 11 also reciprocates The rotary operation drives the tooth frame 13 to make a corresponding swing action, and the effect of the positioning groove 133 makes the tooth frame 13 and even the cloth feeding dog 14 produce forward and backward movement. The location of the positioning groove 133 in this embodiment is located on the side of the rotary lifting plate 122 of the bracket 13, and the specific location of the positioning groove 133 can realize the transmission of the swinging action.

The tooth frame 13 and its feed dog 14 make the cloth feed dog 14 realize the cloth feeding function that the sewing machine has under the joint action of the tooth lifting drive source 12 and the cloth feed drive source 11, and realize normal sewing. The above-mentioned front and rear cloth feeding swing assembly 15 is used as the key component of the tooth lifting drive source 12 to realize the front and rear cloth feeding action. Here, it is not limited to the following specific implementation. The components that play the same role in everything make the tooth frame 13 produce the front and rear cloth feeding action. All are the scope of protection of this application.

The specific front and rear feeding swing assembly 15 includes a follower plate 151, a fixed limit plate 152, a slider 153, a connecting shaft 156, an insertion rod 157, an outer rotating plate 154 and an inner sliding plate 155, and the inside of the static adjustment bracket 21. It has a running tank 211. The above-mentioned outer rotating plate 154 has a shaft hole for the fixed connection of the cloth feeding driving source 11. The inner sliding plate 155 fits inside the outer rotating plate 154. One end of the inner sliding plate 155 is connected to the slider 153, and the other end of the inner sliding plate 155 is connected to the connecting shaft. 156. The upper end of the follower plate 151 is connected and fixed with an insertion rod 157, and the follower plate 151 is movably connected with the connecting shaft 156, and a bearing is arranged between the two here. The other end of the insertion rod 157 cooperates with the positioning groove 133 of the tooth frame 13, the fixed limit plate 152 is arranged between the tooth frame 13 and the follower plate 151, and the insertion rod 157 penetrates the limit portion 1521 of the fixed limit plate 152, The limiting portion 1521 is used to limit the operating range of the insertion rod 157 when operating.

Fig. 8 is a schematic diagram of the running angle of the motor of the cloth feeding device of the present application, combined with other above-mentioned drawings. The above-mentioned sliding member 153 is arranged and operated in the running groove 211 of the static adjustment bracket 21. The running groove 211 is a closed-loop groove for the sliding member 153 to run around. The running groove 211 has a pitch groove section 212, a first transition groove Section 213, the second transition slot section 214, the thread trimming slot section 215 and the presser foot slot section 216. The needle distance groove section 212 is located between the first transition groove section 213 and the second transition groove section 214, the needle distance groove section 212 is opposite to the thread trimming groove section 215 and the presser foot lifting groove section 216, the needle distance groove section 212 has a needle distance Adjustment function, the thread trimmer groove section 215 and the presser foot lifter groove section 216 have the function of positioning the zero point in addition to their own thread trimming and presser foot lifting functions, that is, the function of positioning the feed dog 14 to zero pitch, The zero pitch is that the stitch pitch of the sewing machine is zero. The needle distance groove section 212, the thread trimming groove section 215 and the presser foot lifting groove section 216 are all arc-shaped, and the needle distance groove section 212, the thread cutting groove section 215 and the presser foot lifting groove section 216 are arranged on the same circle center. A shaft hole fixed to the cloth feeding driving source 11 is arranged on the center of the circle.

The above-mentioned cloth feeding device 10 also has a needle pitch adjustment mechanism, which has a follower plate 151, a fixed stop plate 152, a slider 153, a connecting shaft 156, an insertion rod 157, an outer rotating plate 154 and an inner sliding plate 155, And the needle distance slot section 212 and the cloth feeding drive source 11 are composed. The slider 153 is located inside the needle distance groove section 212 whose section is arc-shaped, and the cloth feeding driving source 11 indirectly drives the slider 153 inside the needle distance groove section 212 in a reciprocating manner to adjust the needle distance. Concretely, the cloth feeding driving source 11 drives the outer rotating plate 154 in a reciprocating manner, and the outer rotating plate 154 drives the inner sliding plate 155 and its sliding member 153, so that the sliding member 153 is driven passively in the arc-shaped pitch groove section 212. Running, the sliding member 153 impels the inner sliding plate 155 to move up and down in the inner sliding plate 155 under the back and forth operation of the pitch groove section 212, and the inner sliding plate 155 then drives the connecting shaft 156, and the connecting shaft 156 drives the follower plate 151 1. The plunger 157 makes the tooth frame 13 and the cloth feeding dog 14 change the original pitch to form a new pitch.

The center position of the cross-section of the above-mentioned needle distance groove section 212 is zero point 2121, which is the zero needle distance position of the sewing machine. The cloth feeding driving source 11 drives the needle distance groove section 212 in a reciprocating manner to adjust the needle distance, and the zero point 2121 corresponds to the cloth feeding The operating position of the driving source 11 to adjust the stitch length is both a start position and an end position. The needle pitch adjustment process is that the cloth feeding drive source 11 has a start position and an end position, and the cloth feed drive source 11 starts at the start position and ends at the start position. In other words, the stitch pitch adjustment of the cloth feed drive source 11 starts at the zero point 2121 End at the zero point 2121 position; the angle at which the cloth feeding drive source 11 rotates to both sides at the zero point 2121 determines the size of the needle pitch. The larger the reciprocating rotation angle of the cloth feeding drive source 11, the larger the needle pitch; The smaller the stitch pitch, the zero stitch pitch of the sewing machine when the reciprocating rotation angle of the cloth feeding drive source 11 is zero degrees, on this basis, the sewing machine can realize different stitch pitch settings with different reciprocating rotation angles according to the setting of the control system, Different needle distances do not require different needle distance groove sections 212 as in the prior art, which greatly improves the intelligence level of the needle distance adjustment of the sewing machine, and has high promotion and use value.

The running groove of the above-mentioned sliding member 153 in the needle distance groove section 212 is arc-shaped. In addition, the running groove of the needle distance groove section 212 in this embodiment can also be set as a flat angle or a wavy shape, a flat angle or a wave shape. The section 212 is driven by the cloth feeding driving source 11 to realize the adjustment of the needle distance and the technical effect of the needle distance groove section 212 on the arc surface is the same. The above-mentioned stitch length adjustment is realized under the control system of the present application to execute the stitch length adjustment command program.

FIG. 9 is a schematic diagram of a thread trimmer 40 and a presser foot lifter 30 of a sewing machine according to the present application, which has a rotary drive source 20 for the thread trimmer 40 and the presser foot lifter 30 . The sewing machine has machine needles. After the sewing machine finishes the work of the machine needles, the sewing machine needs to cut the thread first and then lift the presser foot immediately. The above two sewing actions are performed by the rotary drive source 20 . The cloth feeding driving source 11 enters the sliding member 153 from the needle distance groove section 212 through the second transition groove section 214 into the thread trimming groove section 215, so that the connecting shaft 156 is concentric with the first driving shaft of the cloth feeding driving source 11, therefore, the sliding When the member 153 is running in the thread trimmer trough section 215 and the presser foot lifter trough section 216, the rotary drive source 20 will not apply up and down movement to the connecting shaft 156. The 216 operation has determined the zero pitch position of the cloth feeding dog 14, and will not have an actual impact on the tooth frame 13.

After determining the zero pitch, the rotary drive source 20 first starts to implement the thread trimming action. The output shaft of the rotary drive source 20 is connected to and drives the relevant components of the thread cutting device 40 to perform the thread cutting action. The thread-cutting device 40 has a thread-cutting fork wheel 41 , a thread-cutting crank 42 and a thread-cutting end execution end 43 . The thread trimmer fork wheel 41 has a thread trimmer lever 412 and a return lever 411. The thread trimmer fork wheel 41 is installed and fixed on the first drive shaft of the rotary drive source 20, and the eccentric position of the thread trimmer crank 42 is provided with an action lever 421. The action lever 421 is located between the thread cutting rod 412 and the return rod 411 . The thread trimming lever 412 is pushed to the thread trimming lever 412 under the driving of the rotary driving source 20, and the thread trimming end execution end 43 is driven by the thread trimming fork wheel 41 to perform the thread trimming action; after the thread trimming is completed, the rotary driving source 20 drives the thread trimming The lever 412 continues to run until it acts on the return lever 411 so that the entire thread cutting device 40 returns to its original position.

After the above-mentioned thread trimming action is completed, the slider 153 moves toward the presser foot lift groove section 216 under the drive of the cloth feeding drive source 11 to locate the zero pitch position, and then the rotary drive source 20 implements the presser foot lift action. The presser foot lifter 30 has a presser lifter cam 31 and a presser foot lifter rod 32 , and the presser lifter cam 31 is installed on the rear output shaft of the rotary drive source 20 . The cam portion of the lifting cam 31 acts on the presser foot lifter pin 32 , and the presser foot lifter pin 32 performs the presser foot lifting action on the lifting cam 31 .

Above-mentioned thread cutting device 40 and presser foot lifting device are respectively connected on the front and rear output shafts of the double-head output shafts of the rotary drive source 20, and can also be arranged on one output shaft, and the mode and effect of realization are the same. In addition, when the action lever 421 is driven by the rotary drive source 20 to complete the thread trimming under the driving of the thread cutting lever 412, the lifting cam 31 rotates immediately to perform the action of lifting the presser foot, and the thread cutting lever 412 is completed under the action of the rotation of the action lever 421. Whole thread trimming device 40 returns action.

The above description is only one of the preferred implementation modes of the present application, and does not therefore limit the scope of patent implementation of the present application. All equivalent structures or equivalent process transformations made by utilizing the shapes, structures and principles of the description of the application and the contents of the accompanying drawings , or directly or indirectly used in other related technical fields, are all covered within the scope of patent protection of this application.

Claims

A sewing machine is characterized in that it comprises

The cloth feeding device (10) is used to realize the cloth feeding action, including a cloth feeding driving source;

The thread trimming device is used for thread trimming after the needle work is completed, including a rotary drive source;

Presser foot lifting device, lift the presser foot after the thread trimming action;

Wherein, the rotary power source can drive the thread trimming device and the presser foot lifting device to act sequentially;

Wherein, the cloth feeding device (10) is also integrated with a multi-purpose adjusting assembly, and the cloth feeding driving source can drive the multi-purpose adjusting assembly to adjust the needle distance before the needle moves.
A sewing machine according to claim 1, characterized in that, the cloth feeding device (10) is provided with a tooth frame (13), and the cloth feeding device (10) includes an up and down transfer mechanism and a front and rear transfer mechanism. The up and down transfer mechanism includes a rotary lifting assembly, the rotary lifting assembly includes a tooth lifting drive source (12), and the tooth lifting driving source (12) can drive the rotary lifting assembly to carry the tooth frame with the cloth feeding dog (14) (13) Lifting action.
A sewing machine according to claim 2, characterized in that, the cloth feeding device (10) includes a static adjustment bracket (21), and the rotary lifting assembly includes a rotary lifting plate one (121), a rotary lifting plate two (122) and connecting rod (123), described rotary lifting disc one (121) and rotary lifting disc two (122) are connected by connecting rod (123) hinge;

The middle part of the tooth frame (13) is provided with a bobbin relief cavity (131), and both sides of the tooth frame (13) are respectively provided with chute (132);

Rotary lifting disc one (121) and rotary lifting disc two (122) are eccentrically matched with the chute (132) on both sides of the bracket (13) respectively;

The driving source for lifting teeth (12) is installed on the static adjustment bracket (21), and the first drive shaft of the driving source for lifting teeth (12) passes through the static adjustment bracket (21) and is fixedly connected with the rotary lifting disc one (121), The tooth-lifting drive source (12) can drive the rotary lifting plate one (121) and the rotary lifting plate two (122) to perform reciprocating motion synchronously, and the rotary lifting plate two (122) and the tooth frame (13) are multi-purpose adjustments. Assemblies, the rotary lifting disc 2 (122) can drive the multi-purpose adjustment assembly to move up and down.
A sewing machine according to claim 2, characterized in that, the front and rear transport mechanism includes a front and rear cloth feeding swing assembly (15) connected to the cloth feeding drive source (11), and the front and rear cloth feeding swing assembly (15) Including an insertion rod (157), the tooth bracket (13) is provided with a positioning slot (133), the insertion rod (157) is inserted into the positioning slot (133), and the cloth feeding driving source (11) can drive Tooth frame (13) moves back and forth.
A cloth feeding device (10) for a sewing machine according to claim 3, characterized in that the multipurpose adjustment assembly includes a follower plate (151), a fixed limit plate (152), a sliding member (153), Connect the shaft (156), the outer rotating plate (154) and the inner sliding plate (155); the inside of the static adjustment bracket (41) is provided with a running groove (411), and the outer rotating plate (154) has a feeding cloth The drive source (11) is fixedly connected to the shaft hole, the inner sliding plate (155) fits 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), the upper end of the follower plate (151) is connected and fixed with a plunger (157), the movable connection between the follower plate (151) and the connection shaft (156) is provided with a bearing, the other end of the plunger (157) Cooperate with the positioning groove (133) of the tooth frame (13), the fixed limit plate (152) is arranged between the tooth frame (13) and the follower plate (151), and the insertion rod (157) runs through the fixed limit plate (152 ) has a limiting portion (1521).
A sewing machine according to claim 5, characterized in that, the running groove (211) is a closed-loop groove for the sliding member (153) to run around, and the running groove (211) has a needle pitch groove section (212) , the first transition groove section (213), the second transition groove section (212), the thread trimmer groove section (215) and the presser foot lift groove section (216), the stitch distance groove section (212) is located in the first transition groove section ( 213) and the second transition groove section (212), the thread trimming groove section (215) and the presser foot lifting groove section (216) are arranged on the opposite side of the needle distance groove section (212), on the center of the running groove (211) A shaft hole fixed to the cloth feeding drive source (11) is provided,
A sewing machine according to claim 6, characterized in that, the cloth feeding drive source (11) is provided with a first drive shaft, and the first drive shaft drives the slider (153) into the thread trimming groove section (415 ), the connecting shaft (156) is concentric with the first drive shaft.
A sewing machine according to any one of claims 1-7, characterized in that, the rotary drive source includes a front drive shaft and a rear drive shaft, the thread trimmer is connected to the front drive shaft, and the lifting pressure The foot unit is attached to the rear drive shaft.
A kind of sewing machine according to claim 8, characterized in that, the thread trimming device has a thread trimming fork wheel (41), a thread trimming crank (42) and a thread trimming end execution end (43), and the thread trimming fork wheel (41 ) has a thread-cutting lever (412) and a return lever (411), the thread-cutting fork wheel (41) is arranged on the first drive shaft, and an action lever (421) is arranged on the eccentric position of the thread-cutting crank (42). The rod (421) is located between the thread cutting rod (412) and the return rod (411).
A sewing machine according to claim 8, characterized in that the presser foot lifter has a presser foot lifter cam (31) and a presser foot lifter push rod (32), and the lifter presser cam (31) is installed on a rotary drive source to output On the shaft, the cam portion that the lifting cam (31) has acts on the presser foot lifter (32), and the presser foot lifter (32) implements the presser foot lifter action at the lifting pressure cam (31).