151 results about "Feed dogs" patented technology

The invention provides a sewing starting control method based on presser foot lifting feeding. The sewing starting control method comprises the following steps that an electric control unit, a presser foot rod, a presser foot and a presser foot lifting mechanism are arranged in a sewing machine; after the sewing material to be sewn is placed, the presser foot is put down, and the electric control unit receives a thick material sewing starting signal; before a feeding tooth sinks downwards into a needle plate during sewing of a first needle, an electric control unit controls a presser foot lifting driving source to act, the presser foot lifting driving source drives a presser foot rod and a presser foot to move upwards through a presser foot lifting transmission unit, the presser foot is lifted to the sewing target height, and the upwarp angle of the presser foot relative to the horizontal plane is reduced; at the moment, the presser foot is still pressed and attached to the sewing starting part of the to-be-sewn sewing material, and the horizontal component force of the pressure applied to the sewing starting part of the to-be-sewn sewing material by the presser foot is not larger than the maximum static friction force between the sewing starting part of the to-be-sewn sewing material and the sewing machine needle plate; in this way, after the feeding teeth sink downwards into the needle plate in the first stitch starting process, the undesirable phenomenon that the sewing starting part of the sewing material to be sewn is pushed away by the presser foot is avoided, and sewing starting material pushing is effectively avoided.

The present application provides a cloth feeding mechanism and a sewing machine for a sewing machine, specifically relating to the technical field of sewing machine manufacturing. The cloth feeding mechanism has a cloth feeding drive source and a lifter drive source. The cloth feeding drive source indirectly drives the tooth carrier of the cloth feeding mechanism. While the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion. The tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. By using the cloth feeding drive source to indirectly drive the tooth carrier of the cloth feeding mechanism, and while the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion, it is realized that the tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. The present application makes full use of the drive source of the sewing machine, effectively improves the utilization efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, and has high value for use and promotion.

The utility model provides a feeding mechanism of a sewing machine, and belongs to the technical field of sewing machines. The problem that an existing sewing machine is insufficient in universality is solved. The feeding mechanism of the sewing machine comprises a feed dog, a feeding shaft and a feed lifting shaft which can swing in a reciprocating mode are arranged at the bottom of a machine base, the feeding mechanism further comprises a feeding connecting rod and a vertically-arranged feed dog frame connecting rod, and a feeding boss located above the feeding connecting rod is arranged on the machine base in a protruding mode. A strip-shaped sliding groove formed in the length direction of the feed dog frame connecting rod is formed in the feed dog frame connecting rod, the feed dog frame connecting rod is connected with the machine base through a connecting piece arranged in the strip-shaped sliding groove in a penetrating mode, the feed dog is located in the feed boss and fixedly connected to the upper end of the feed dog frame connecting rod, and the middle of the feed connecting rod is hinged to the lower end of the feed dog frame connecting rod. The feeding shaft is connected with one end of the feeding connecting rod and can drive the feeding connecting rod to move front and back in the feeding direction, and the feed lifting tooth shaft is connected with the other end of the feeding connecting rod and can drive the feeding connecting rod to move up and down. The sewing machine has the advantage of being high in universality.

The utility model provides a sewing machine for cloth hemming. The sewing machine for cloth hemming comprises a sewing machine body, a hemming folder and an adjusting blocking piece. The hemming folder is correspondingly arranged on a table plate of the sewing machine, the discharging end of the hemming folder corresponds to a presser foot of the sewing machine, the adjusting blocking piece is arranged on the table plate of the sewing machine corresponding to a discharging port of the hemming folder, and the end, close to the presser foot of the sewing machine, of the adjusting blocking piece is located at the front end of a feeding tooth of the sewing machine. And the lower surface of the hemming cloth strip discharged from the folder can be propped against the lower surface of the hemming cloth strip, so that the forward resistance of the lower-layer cloth of the hemming cloth strip is increased. According to the utility model, the friction force of the lower-layer cloth is increased by adopting the contact between the adjusting separation blade and the lower surface of the cloth strip, so that the synchronism of the upper-layer cloth and the lower-layer cloth in the sewing process is ensured, the wrinkling or loosening phenomenon is greatly reduced, and the stability and the consistency of edge covering are improved.

The utility model provides a feed dog adjusting mechanism and sewing equipment, which comprises a feed lifting shaft, a feed lifting fork-shaped crank, a feed dog frame and a feed dog, the feed dog is arranged on the feed dog frame, one end of the feed dog frame is provided with a sliding block, and the sliding block is in sliding connection with a fork groove of the feed lifting fork-shaped crank; one end of the tooth frame is connected with the sliding block through an eccentric pin, the eccentric pin comprises an eccentric part and a concentric part, and the eccentric part and the concentric part are eccentrically connected; the eccentric part is hinged to one end of the tooth frame, and the concentric part penetrates through the sliding block and is hinged to the sliding block; a ratchet adjusting wrench and a locking block are further arranged on the concentric part, and the ratchet adjusting wrench is arranged between the locking block and the sliding block; the locking block is arranged on the concentric part in a sleeving mode, and the locking block and the eccentric pin synchronously move in the circumferential direction. The mode of adjusting the height of the feeding tooth is simple and rapid, a lathe worker can rapidly adjust the height of the feeding tooth, the operation of waiting for maintenance personnel in the prior art is not needed, and the working efficiency can be effectively guaranteed.

The utility model discloses a sewing mechanism for sewing a zipper and cutting a base fabric. The sewing mechanism comprises a needle plate, wherein the needle plate is provided with a containing groove used for containing and guiding a zipper head to move transversely and two containing holes formed in the front side and the rear side of the containing groove; the upper end of the cloth feeding frame is provided with two cloth feeding blocks, the tops of the cloth feeding blocks are provided with cloth feeding teeth, and the two cloth feeding blocks correspondingly extend into the two containing holes; the first presser foot frame is provided with two inner presser feet, and the two inner presser feet are correspondingly arranged above the two cloth feeding blocks; two machine needles are mounted on the machine needle seat, and the two machine needles correspond to the first through holes in the two inner presser feet and the second through holes in the two cloth feeding blocks up and down correspondingly; the slotting cutter is arranged above the containing groove and connected with a driving assembly driving the slotting cutter to move up and down, and when the driving assembly drives the slotting cutter to move downwards, the slotting cutter can stretch into the containing groove. According to the technical scheme, the zipper head does not need to be taken down when the zipper and the base cloth are sewn, the sewing speed of the base cloth and the zipper is increased, and the processing efficiency is improved.

A controller of a sewing machine acquires sewing data for forming a utility pattern continuously in a first direction, acquires a condition for sewing a tapering pattern including a tapering portion, generates a projection image representing the tapering pattern based on the sewing data and the condition, controls a needle bar, a feed dog, and an actuator in accordance with the sewing data to sew the utility pattern continuously in the first direction, after starting sewing of the utility pattern, controls a projector to project the projection image at a planned sewing position of the tapering pattern in a planned sewing size, and performs a tapering pattern sewing operation of, after starting projection of the projection image, controlling the needle bar, the feed dog, and the actuator in accordance with the sewing data and the condition to sew the tapering pattern that is continuous with the utility pattern.

The utility model discloses a thread trimming device of a sewing machine and the sewing machine with the thread trimming device, which belong to the technical field of sewing machine accessories, and comprise a blade, a first-stage oscillating bar mechanism, a second-stage oscillating bar mechanism, a third-stage oscillating bar mechanism and a telescopic component which are arranged in a panel of the sewing machine and are connected in sequence, the first-stage oscillating bar mechanism, the second-stage oscillating bar mechanism, the third-stage oscillating bar mechanism and the telescopic component are all connected with the sewing machine panel; the blade is arranged on one side above a bobbin case in the sewing machine panel; the sewing machine comprises a machine head and a sewing machine panel, the thread trimming device is installed in the sewing machine panel, and the blade is arranged on the lower right portion of feed dogs at the end of the sewing machine panel. The telescopic component drives the first-stage swing rod mechanism, the second-stage swing rod mechanism and the third-stage swing rod mechanism to drive the blade to swing, a sewing thread between a machine needle and a bobbin case can be cut off after sewing is finished, the downtime is shortened, the working efficiency is improved, and the labor intensity of workers is reduced; and the original sewing machine can be reformed, so that the production cost is reduced.

The invention discloses a neckline sewing control system, and particularly relates to the technical field of neckline sewing, the neckline sewing control system comprises a sewing mechanism, an upper feed dog, a lower feed dog, a differential motor, a differential transmission mechanism, a first roller and a second roller, the first roller and the second roller are used for feeding, and the differential motor and the differential transmission mechanism are used for controlling the speed of the upper feed dog and the speed of the lower feed dog; the neckline calculation module is used for calculating the total length of the neckline, the neckline length storage module is used for reading and storing the total length of the neckline, and the neckline distribution module is used for distributing the neckline into a front neckline section, a left accommodating section, a rear neckline section and a right accommodating section in proportion and outputting a distribution result. The speed control module is used for sending a speed control command to the differential motor according to the output distribution result and controlling the upper feed dog and the lower feed dog to feed the cloth in four intervals at different differential speeds through the differential motor; the neckline is arranged in a partitioned mode, cloth feeding at different differential speeds is carried out according to different partitions, and therefore personalized manufacturing of the neckline is achieved.

The utility model provides a feed dog height adjusting mechanism and sewing equipment, which comprises a feed lifting shaft, a feed lifting fork-shaped crank, a feed dog frame and a feed dog, the feed dog is arranged on the feed dog frame, one end of the feed dog frame is provided with a sliding block, and the sliding block is in sliding connection with a fork groove of the feed lifting fork-shaped crank; one end of the tooth frame is connected with the sliding block through an eccentric pin; the eccentric pin comprises an eccentric section and a concentric section which are eccentrically connected, the eccentric section is arranged in a tooth frame shaft hole formed in the tooth frame in a penetrating mode, and the concentric section penetrates through the sliding block and can rotate in the sliding block in the circumferential direction. The eccentric pin is further provided with a height adjusting assembly, the height adjusting assembly and the eccentric pin synchronously move in the circumferential direction, the circumferential movement of the height adjusting assembly drives the circumferential movement of the eccentric pin, and the height of the eccentric section is adjusted. The operation mode of the height adjusting assembly is convenient, fast and simple, a lathe worker can rapidly adjust the height of the feeding tooth, operation of waiting for maintenance personnel in the prior art is not needed, and therefore the operation efficiency of a garment factory can be guaranteed.

The utility model provides a feed dog height adjusting mechanism and sewing equipment, which comprises a feed lifting shaft, a feed lifting fork-shaped crank, a feed dog frame and a feed dog, the feed dog is arranged on the feed dog frame, one end of the feed dog frame is provided with a sliding block, and the sliding block is in sliding connection with a fork groove of the feed lifting fork-shaped crank; one end of the tooth frame is connected with the sliding block through an eccentric pin; the eccentric pin comprises an eccentric part and a concentric part, and the eccentric part and the concentric part are eccentrically connected; the eccentric part is hinged to one end of the tooth frame, and the concentric part penetrates through the sliding block and is hinged to the sliding block; an adjusting crank is further arranged on the concentric part, and the adjusting crank and the eccentric pin synchronously move in the circumferential direction. The adjusting crank and the locking stud are adopted, the adjusting groove is formed in the adjusting crank, an operator can rotate the eccentric pin at any angle within the limiting range of the adjusting groove, and therefore stepless adjustment of the height of the feeding tooth is achieved.

The utility model relates to the technical field of lockstitch sewing machines, in particular to an adjustable upper differential lockstitch sewing machine. Comprising a rack, an upper cloth feeding mechanism is arranged in the rack, and the upper cloth feeding mechanism is driven by an upper shaft; the upper cloth feeding mechanism comprises a swing seat, a longitudinal moving assembly and a swing assembly. The swing assembly comprises a first cam, a second cam, a third cam and a fourth cam, the first cam connecting rod is connected with the first cam; one end of the first transmission connecting rod is connected with the first cam connecting rod, and the other end of the first transmission connecting rod sleeves the first transmission shaft; the first transmission part is arranged on the first transmission shaft in a sleeving manner; the swing rod is connected with the transmission part I, and the lower end of the swing rod is hinged to the swing seat; when the swing assembly drives the swing rod to rotate, the lower end of the swing rod can pull the swing base to move. The swing assembly and the longitudinal moving assembly are matched so that the swing base can execute the cloth feeding action. The rack is further provided with a first adjusting assembly, and the lifting height of the upper feed dog can be adjusted through the first adjusting assembly.

The utility model provides a sewing machine which comprises a feed dog frame, a feed dog installed on the feed dog frame, a feed dog lifting mechanism connected with one end of the feed dog frame, a thread trimming mechanism, a driving motor, a feed dog lifting transmission assembly and a thread trimming transmission assembly. The periphery of the feed lifting driving cam is provided with a thread cutting anti-nest section, a tooth height adjusting section and a feeding section which are mutually independent, the feed lifting transmission assembly comprises a rotatable feed lifting roller, the feed lifting roller abuts against the periphery of the feed lifting driving cam, and the feed lifting driving cam is connected with the feed lifting mechanism through the feed lifting transmission assembly; the thread trimming driving piece is connected with the thread trimming mechanism through a thread trimming transmission assembly. The automatic thread trimming device has the advantages that the multiple functions of automatically removing bird nests, automatically trimming threads, adjusting the height of the feed lifting teeth, changing the feeding track and the like are achieved through one motor, the internal installation space of the sewing machine is saved, and meanwhile the production and manufacturing cost of the sewing machine is reduced.

The utility model provides a kind of movement device of cylinder sewing machine feed dog, belong to sewing machine technical field.It solves the problem that existing feed dog movement device is not applicable to cylinder sewing machine.This sewing machine includes the cabinet with long arm, the first end of swing arm is fixed with feed dog, the middle part of swing arm is hinged with long arm, the first end of lifting tooth bar is hinged with long arm, the first end of lifting tooth bar is located directly below the first end of swing arm, lower shaft can drive swing arm swing back and forth around its hinged point by feeding assembly, lower shaft can drive lifting tooth bar swing up and down around its hinged point by lifting tooth assembly, the first end of lifting tooth bar swing upwards can make the first end of swing arm move upwards, swing arm can make the first end of swing arm move downwards under the action of its elasticity.This movement device of cylinder sewing machine feed dog has the advantages of reasonable use of space, smooth movement of cylinder sewing machine feed dog.

The invention provides a sewing machine feed dog adjusting device and a sewing machine, the sewing machine feed dog adjusting device comprises a bottom plate, a feed dog lifting shaft, a feed dog frame, a feed dog, a feed dog lifting crank, a feed dog lifting connecting rod, a feed dog lifting adjusting eccentric pin and a feed dog lifting adjusting knob, the feed dog lifting crank is fixed on the feed dog lifting shaft, and the feed dog lifting adjusting eccentric pin comprises a first shaft part and a second shaft part which are eccentrically arranged; the first shaft part is in running fit with the feed lifting crank and is fixed with the feed lifting adjusting knob, the second shaft part is in running fit with one end of the feed lifting connecting rod, and the other end of the feed lifting connecting rod is hinged with the feed rack; the feed lifting crank and the feed lifting adjusting knob are respectively provided with a plurality of adjusting positioning grooves and telescopic adjusting positioning pieces; when the feed lifting adjusting knob is rotated, the feed lifting adjusting eccentric pin synchronously rotates along with the feed lifting adjusting knob, the relative position between the second shaft part and the feed lifting connecting rod is changed, and the adjusting positioning piece moves out of the current adjusting positioning groove and is clamped into the other adjusting positioning groove. The height of the feeding teeth can be easily and conveniently adjusted by a lathe worker.

The present application proposes a positioning device for the feed dog of a sewing machine, which specifically relates to the technical field of sewing machine manufacturing, and includes a positioning device, wherein the power source of the positioning device acts on the tooth rack of the sewing machine, so that the tooth tip of the tooth rack is positioned and lower than the plane of the needle plate of the sewing machine; the limiting baffle of the positioning device acts on the fork crank limiting groove of the fork crank, the fork crank movable connecting sleeve is arranged on the tooth lifting shaft, and the tooth lifting slider groove of the fork crank is movably connected to the tooth lifting slider of the tooth rack, so that the tooth tip of the tooth rack is positioned and lower than the plane of the needle plate of the sewing machine, and the tooth tip of the tooth rack is implemented by the above-mentioned specific positioning device to stay below the plane of the needle plate. The positioning device of the present application is set on the sewing machine for use, which fully improves the intelligent control level of the sewing machine, reduces the labor intensity of the operator, and at the same time, the sewing quality is further improved.

To appropriately set feed amount of a sub feed dog.SOLUTION: A differential feed sewing machine comprises: a feed mechanism 30 having a main feed dog 31 and a sub feed dog 32 that feed on a downstream side and an upstream side in a feed direction of a sewn object; a first feed adjusting mechanism 60 to adjust a sewing pitch of the main feed dog to an arbitrary size; and a second feed adjusting mechanism 80 to adjust a sewing pitch of the sub feed dog to an arbitrary size. The second feed adjusting mechanism adjusts the sewing pitch of the sub feed dog by an actuator 82 and has a setting input part 95 to set and input the sewing pitch of the sub feed dog and a control device 90 to control the actuator so that the sewing pitch becomes the sewing pitch of the sub feed dog input from the setting input part.SELECTED DRAWING: Figure 4

The present application proposes a split-type flat-bed sewing machine, which specifically relates to the technical field of flat-bed sewing machine manufacturing. The flat-bed sewing machine has a frame, a table, a thread-up mechanism and a thread-down mechanism, and is characterized in that the thread-up mechanism at least has a needle bar assembly, a presser foot lifting assembly and a thread-taking assembly, and the thread-down mechanism at least has a feed dog assembly, a rotary hook assembly and a thread-cutting assembly, and there is no mechanical transmission connection between the thread-up mechanism and the frame, and the thread-down mechanism has no mechanical transmission connected to the table. The present application proposes a split-type flat-bed sewing machine, which has an thread-up mechanism and a thread-down mechanism that each operate independently, and cleverly separates the thread-up mechanism and the thread-down mechanism in terms of mechanical transmission, cancels the traditional upper and lower linkage mechanical transmission structure, and realizes the oil-free operation of the flat-bed sewing machine mechanical transmission mechanism without lubrication, simplifies the mechanical structure, and greatly reduces the manufacturing cost of the sewing machine, and has a high promotion value.

The eccentric wheel structure of the sewing machine comprises a main shaft and an eccentric wheel assembly, the eccentric wheel assembly comprises a rotating sleeve block, a first eccentric wheel and a second eccentric wheel, the rotating sleeve block is sleeved on the main shaft in a rotating mode, and the first eccentric wheel and the second eccentric wheel are arranged in linkage with the rotating sleeve block. The driven wheel is connected with a driving wheel through a chain or a belt, and the driving wheel is connected with a motor. The feed dog is reasonable in design, the rotating sleeve block is arranged on the main shaft in a sleeved mode, the rotating sleeve block is driven to rotate through the structure of the motor, the driving wheel and the driven wheel, and therefore the feed dog can be independently controlled and adjusted through the motor, and diversity and variability of the sewing technology and sewing quality are changed and improved.

The present invention provides a seam start anti-pushing control method based on a downward feeding function. When the presser foot is raised, the feed dog is sunk under the needle plate by controlling the action of a feed dog lifting drive source, thereby realizing the downward feeding of the feed dog and facilitating subsequent material collection and discharge. Before discharge, the feed dog is moved to a set first preset position under the needle plate. After discharge, before the presser foot is lowered, the feed dog is moved upward, so that the feed dog emerges from the needle plate, and the feed dog has a holding effect on the seam start portion of the sewing material. When the presser foot is subsequently lowered, the presser foot is reliably prevented from pushing the seam start portion of the sewing material backward. Thereafter, before the feed dog sinks into the needle plate when starting the first stitch, the action of the feed dog lifting drive source and the feed drive source is controlled, so that the feed dog feeds the seam start portion of the sewing material forward by a distance L, so that the angle α between the presser foot and the horizontal plane at this time satisfies α=0°, or tanα≤μ. After the feed dog sinks under the needle plate for the first time, the sewing material will not be pushed backward by the presser foot.

The utility model discloses an automatic differential adjusting mechanism which comprises a stepping motor installed on the rear portion of a machine head of a sewing machine, a power output shaft of the stepping motor is connected with a swing rod, a U-shaped groove is formed in the lower end of the swing rod, and the U-shaped groove is movably matched with a driving bearing on a differential connecting rod. According to the automatic differential adjusting mechanism, the working position of the differential connecting rod can be controlled in real time through the stepping motor, the differential value of the feed dog can be automatically adjusted in the sewing process, and cloth has the most appropriate tension degree in the sewing process.

Sewing machine (100), including: a needle vertical movement mechanism which moves a needle bar up and down; a sewing machine motor (16) which drives the needle vertical movement mechanism as a drive source; a transporter holder (32) which holds a transporter (31) which transports a workpiece on a needle plate; a horizontal transport mechanism which receives a driving force from the sewing machine motor (16) and transmits a horizontal back-and-forth movement to the feed dog support (32); and a vertical transport mechanism which imparts a vertical back-and-forth movement to the transporter holder (32), wherein the horizontal transport mechanism includes a transport adjustment motor (57) which changes and adjusts the division of the horizontal reciprocating movement by the sewing machine motor (16) with respect to the feed dog support (32), the vertical transport mechanism comprises a vertical transport motor (66) which provides the vertical reciprocating movement with respect to the transporter support (32) as a drive source, the sewing machine (100) includes a control device (90) which controls the feed adjustment motor (57) and the vertical feed motor (66) in order to cause the feed dog (31) to transport the workpiece, the control device (90) controls the vertical transport motor (66) in such a way that the feed dog (31) performs a circular movement along a predetermined path in synchronization with a rotation angle of a main shaft which is rotatably driven by the sewing machine motor (16), and controls the vertical transport motor (66) in such a way that a path of the feed dog (31) in a transport section is corrected according to a rotation speed of the main shaft.

The utility model relates to the technical field of garment processing, and discloses a flat seaming machine for garment processing, which comprises a sewing table, a flat seaming machine body is movably mounted at the top of the sewing table, feeding teeth are arranged at the bottom of the inner wall of the flat seaming machine body, a cavity is reserved in the sewing table, the inner wall of the cavity is fixedly connected with a sealing frame, and the sealing frame is fixedly connected with the sewing table. A suction hole is formed in the top of the sewing table, and a suction pipe is fixedly connected to the top of the sewing table. The flat seaming machine has the following advantages and effects that when clothes are processed, cloth penetrates through the bottom of the dust removal box and then enters the flat seaming machine body, the feeding teeth convey the cloth and drive the cloth to move above the suction holes, batting at the bottom of the cloth is cleaned by the suction holes, the top of the cloth is rubbed by soft hair, the batting and the cloth are conveniently separated, and the cloth is prevented from falling off. Fluff at the top is cleaned by a second suction hole and falls on a guide groove to be collected, so that the fluff of the cloth can be effectively removed, and the fluff is prevented from influencing the normal use of the flat seaming machine body.

The application provides a feed dog assembly, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine, and particularly relates to the technical field of sewing machine manufacturing, and comprises a feed dog assembly, an up-down lifting power source and a front-rear feed power source, the feed dog assembly is jointly driven by the up-down lifting power source and the front-rear feed power source, the up-down lifting power source and the front-rear feed power source act on the feed dog assembly to perform a feed action of the sewing machine, the front-rear feed power source has a front output shaft to perform a thread trimming action of the thread trimming mechanism, and the front-rear feed power source has a rear output shaft to perform a presser foot lifting action of the presser foot lifting mechanism. The single power device can realize the thread trimming action and the presser foot lifting action under the control of an electric control system of the sewing machine, effectively improves the use efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, further improves the intelligent control level of the sewing machine, and has high use and promotion value.

The embodiment of the present invention discloses an industrial sewing machine that is easy to assemble, including a sewing machine head, a base, a feeding mechanism, an upper and lower shaft synchronization mechanism and a needle feed dog synchronization mechanism, wherein the upper and lower movement of the needle of the sewing machine head is driven by the upper shaft, and the forward and backward swing is driven by the feed shaft; the rotary shuttle of the base is driven by the lower shaft, and the feed dog is driven by the transition shaft; the upper shaft and the lower shaft are linked by the upper and lower shaft synchronization mechanism, and the feed shaft and the transition shaft are linked by the needle feed dog synchronization mechanism; the transmission paths of the upper and lower shaft synchronization mechanism and the needle feed dog synchronization mechanism all pass through the bracket behind the needle and the support seat on one side of the bracket; the feeding mechanism is arranged behind the needle for transmitting cloth. The present invention can realize the simultaneous sewing of mattress fabric and both sides of the chain, improve sewing efficiency, and at the same time ensure the symmetry of the cloth on both sides, so that the zipper opens and closes smoothly.

The invention provides a method for controlling the uniform stitch length of a sewing machine. The method comprises the following steps that S1, a plurality of adjusting stitch length values and a plurality of adjusting motor output swing angles are preset in a controller; s2, in the process that the feed dog executes the nth cloth feeding action, recording the moment when the feed dog protrudes upwards from the needle plate and jacks up the sewing material as t1n, recording the moment when the feed dog is located at the highest point as t2n, recording the set moment between the t1n and t2n as t3n, and obtaining sewing material thickness values H1n and H3n respectively by a thickness detection mechanism at the t1n moment and the t3n moment; the controller obtains an adjusting needle pitch value Dn according to the H1n and the H3n and controls the output shaft of the adjusting motor to be at an output swing angle corresponding to the Dn, and n is a positive integer. The control method provided by the invention has the beneficial effects that by adopting the control method provided by the invention, the change condition of the thickness of the sewing material can be obtained in real time and the stitch length can be adjusted in time in the process of sewing each stitch by the sewing machine, so that the stitch length cannot be suddenly changed, and the uniformity of the stitch length on the sewing material is ensured.

The invention provides a sewing machine feed dog adjusting device and a sewing machine, the sewing machine feed dog adjusting device comprises a fixedly arranged base plate, a feed dog lifting shaft rotatably supported in the base plate, a feed dog frame, a feed dog fixed on the feed dog frame and a transmission adjusting assembly, and the transmission adjusting assembly is in transmission connection between the feed dog lifting shaft and the feed dog frame. The transmission adjusting assembly is provided with an adjusting execution part for a user to operate, a locking structure is further arranged between every two adjacent parts in the transmission adjusting assembly, and the locking structures are used for keeping the relative positions of the two adjacent parts; when a user operates the adjusting execution part, the height of the feeding teeth during follow-up operation of the sewing machine is changed, and the current relative positions of the two adjacent parts are changed, so that a turner can easily and conveniently adjust the height of the feeding teeth. The relative positions of the two adjacent parts are locked through the locking structures, so that the height of the feeding teeth is locked after each time of adjustment. The sewing machine is simple in overall structure and low in cost, the overall cost of the sewing machine is reduced, and competitiveness is improved.

The present application proposes a sewing machine without a swing seat, specifically relating to the technical field of sewing machine manufacturing. The sewing machine has a drive source, a cloth feed shaft, a cloth feed dog, a thread trimming mechanism, and a presser foot lifting mechanism. The sewing machine is characterized in that the sewing machine also has a cloth feed and stitch length adjustment mechanism. The front output shaft of the drive source is equipped with an outer rotating plate of the cloth feed and stitch length adjustment mechanism. The drive source drives the outer rotating plate in a rotary drive mode. The outer rotating plate is connected to the cloth feed shaft, and the cloth feed shaft is indirectly connected to the cloth feed dog. The sewing machine of the present application does not have a swing seat but has all the functions of a swing seat. Moreover, the stitch length adjustment mechanism has the function of adjusting multiple stitch lengths using a single drive source without having to replace parts such as the stitch length slot. This effectively improves the intelligent control level of the sewing machine and has a high value for use and promotion.

The utility model discloses a stitch length adjusting mechanism for a flat seaming machine, which belongs to the technical field of flat seaming machines, and comprises a feed dog assembly and a stitch length adjusting assembly, the feed dog assembly comprises feed dogs, an eccentric wheel, a main shaft, a synchronizing part, a driven gear and a feed dog motor, and the stitch length adjusting assembly comprises a stitch length adjusting motor, a driving gear and a driver. The stitch length adjusting motor and the feed dog motor are respectively provided with an output shaft, the driving gear is movably arranged on the output shaft of the stitch length adjusting motor, the driver is in driving connection with the driving gear, the driven gear is fixedly arranged on the output shaft of the feed dog motor, and the feed dog motor is arranged on the driven gear. The driving gear is movably meshed with the driven gear, the synchronizing part is connected with an output shaft of the feed dog motor and one end of the main shaft, the other end of the main shaft is connected with the eccentric wheel, the feed dog is arranged on the main shaft, and the eccentric wheel is connected with the feed dog.

This invention provides a feed mechanism for an overlock sewing machine that solves the problem of the significant amount of adjustment required to change the main feed momentum and differential feed momentum compared to conventional methods. [Solution] The overlock sewing machine's feed system comprises a fabric feed mechanism 3 equipped with a main feed dog 20, differential feed dog 21, main feed table 22, differential feed table 23, feed up / down mechanism 30, main feed forward / backward mechanism 4, and differential feed forward / backward mechanism 5; a feed amount adjustment mechanism 6 equipped with a main feed amount adjustment mechanism 7 including a first stepping motor 73 and a differential feed amount adjustment mechanism 8 including a second stepping motor 83; and control devices and input devices for the first stepping motor 73 and the second stepping motor 83.