67 results about "Feed dogs" patented technology

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.

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 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 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 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 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 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.

The utility model provides a kind of sewing machine's feed dog adjusting device, including driving motor, transmission assembly and adjusting assembly, driving motor swings adjusting assembly by transmission assembly drive, adjusting assembly is used to adjust the angle size of differential feeding shaft positive, reverse swing;Adjusting assembly includes adjusting seat, transmission assembly includes slider and the sliding slot in the side of adjusting seat, slider is fixed on the output shaft of driving motor, adjusting shaft is parallel to the output shaft of driving motor and is arranged, slider is slidably arranged in sliding slot, driving motor drives slider rotation, slider drives adjusting seat swing.This sewing machine's feed dog adjusting device realizes feed dog automatic regulation by driving motor, transmission assembly so that it can be according to the size of space in casing reasonably arrange the installation position of driving motor, compact structure, suitable for sewing machine casing of space limited, wide application range, traditional stability.

To provide a sewing device in which the degree of freedom in setting the length of a needle thread and a bobbin thread is improved more than before.SOLUTION: A control device of a sewing machine drives a needle bar mechanism and a feed dog, and executes sewing work for forming a seam on a workpiece with a thread (S7). The control device executes a yarn catching process of moving the movable blade from the standby position to a yarn catching position where the movable blade catches the yarn, and further moving the movable blade to a movable position on a side opposite to the standby position with respect to the yarn catching position. The control device executes length adjustment processing for positioning the lower end of the needle above the throat plate to make the workpiece movable in a state where the movable blade catches the thread by the thread catching processing (S11). After the length adjustment processing, the control device executes cut processing for moving the movable blade to a cut position where the movable blade crosses the fixed blade and cutting the thread (S14).SELECTED DRAWING: Figure 10

The utility model discloses an anti-bite clamp, which belongs to the technical field of dog training instruments and comprises a base plate, dog food can be placed in the base plate, a clamping component is arranged on the base plate, the clamping component can be folded or unfolded relative to the base plate, when the clamping component is folded, the clamping component clamps the dog food or a dog basin or blocks the dog food in the base plate, and when the clamping component is unfolded, the clamping component can clamp the dog food or the dog basin or blocks the dog food in the base plate. The clamping assembly cancels blocking of the dog food in the chassis, the chassis is connected with a connecting assembly, the connecting assembly is provided with a control assembly, and the clamping assembly is controlled to be folded or unfolded through the control assembly. The clamping assembly is used for clamping a dog basin and dog food to feed dogs, the clamping assembly can also be used for grabbing the dog food and holding the dog food in the base plate, when the clamping assembly is closed, the dog food is blocked, the dogs cannot eat food, and when the dogs need to eat food, the clamping assembly is opened, the dog food in the base plate is exposed, and the dogs can eat food. The feeding rhythm of the dog is controlled, and the mood of the dog is stabilized to train the dog.

The oral liquid feeding device for the sea-buckthorn zinc dogs comprises a placing frame, a storage bottle used for storing oral liquid for the sea-buckthorn zinc dogs is placed in the placing frame, an installation cavity is formed in the placing frame, a water basin used for feeding the dogs is installed in the installation cavity, and the cavity wall of the installation cavity makes contact with the water basin to conduct vertical positioning and transverse positioning on the water basin. A bayonet is formed in the rear portion of the water basin, a cam is rotationally installed on the placing frame, the cam is transversely clamped into the bayonet to clamp the water basin so as to longitudinally position the water basin, the cam is exposed to be operated and rotated by people, and the rotating shaft is a longitudinal shaft. The cavity wall of the mounting cavity is used for vertically and transversely positioning the basin, and the cam is transversely clamped into the bayonet to clamp the basin so as to longitudinally position the basin, so that the basin can be effectively fixed. During feeding, the water basin is not easily pulled out and knocked over by dogs. When a user needs to move the water basin, the cam is operated to rotate to be separated out of the bayonet, so that the cam does not clamp the water basin any more, and extra resistance cannot be brought to the movement of the water basin.

The utility model provides a kind of sewing machine's feed dog driving mechanism, including shell, motor and feeding assembly, motor is fixed on the side surface of shell, feeding assembly includes forked crank, synchronous connecting rod, feeding swing bar, feeding connecting rod, feed dog frame, feed dog, forked crank is fixed with the output shaft of motor, between the end portion of forked crank and feeding swing bar, it is connected by synchronous connecting rod, feeding swing bar is equipped with feeding swing bar shaft, the side surface of shell is equipped with two fixed lugs, the both ends of feeding swing bar shaft are respectively hinged on two fixed lugs, between the end portion of feeding swing bar and feed dog frame, it is connected by feeding connecting rod, feed dog is installed on feed dog frame.The feed dog driving mechanism of this sewing machine is driven to feed dog by motor and feeding assembly, motor directly drives and can be adjusted to the swing amplitude of feed dog by computer control motor operation, realize the combination and simplification of the driving structure and the adjusting structure of feed dog.

The utility model relates to a clothing sewing appliance, in particular to a novel movable lower shrinking and wrinkling assembly of a lockstitch sewing machine. The utility model aims to provide a novel movable lower shrinking and wrinkling assembly of a lockstitch sewing machine, which has the functions of shrinking and sewing simultaneously, and has the characteristics of simple structure and convenience in use. According to the technical scheme, the movable lower shrinking and wrinkling assembly of the novel lockstitch sewing machine comprises a sewing needle driven by a sewing mechanism and a presser foot fixed to a presser foot rod. The wrinkling assembly is characterized in that the wrinkling assembly further comprises a fixing frame fixed to the working table, a swing arm located on the fixing frame in a swing mode, an adjusting support movably located on the swing arm and a wrinkling piece installed at the front end of the adjusting support, and the wrinkling piece is located above the feed dog.

The utility model provides a locking mechanism in a feed dog adjusting device on a sewing machine, and belongs to the technical field of sewing machines. The technical problem that an existing locking mechanism is low in stability is solved. The locking mechanism in the feed dog adjusting device on the sewing machine comprises a synchronous check ring and a locking swing rod, the synchronous check ring is fixedly arranged on a main shaft in a sleeving mode and located at one end of a first eccentric wheel, the synchronous check ring and a second eccentric wheel are fixed in the circumferential direction, and a plurality of positioning grooves are formed in the circumferential surface of the synchronous check ring in the circumferential direction; the middle section of the locking swing rod is hinged to one end of the first eccentric wheel and located on one side of the synchronous check ring, one end of the locking swing rod is provided with a positioning protruding part capable of being embedded into the positioning groove, an elastic piece is arranged between one end of the locking swing rod and the first eccentric wheel, the other end of the locking swing rod is an unlocking end, and the unlocking rod can be pressed on the unlocking end of the locking swing rod when extending. And when the unlocking rod extends, the first eccentric wheel can be circumferentially fixed. The utility model has the advantage of more stable use.

To provide a sewing machine contributing to improvement in operability of a workpiece when a user manually moves the workpiece in execution of free motion sewing.SOLUTION: A processor of the sewing machine drives a sewing machine motor in a state where an upper end of a feed dog is positioned below a throat plate, and executes free motion sewing processing for vertically moving a needle bar (S32, S35, S36). At least a part of a needle up period in which the lower end of the needle is above the throat plate is defined as a first period, and at least a part of a needle second half in which the lower end of the needle is below the throat plate is defined as a second period. The thread tension control processing includes adjusting a length of the spring in a pressure direction during a first period to a first length, and adjusting a length of the spring in the pressure direction during a second period to a second length shorter than the first length (S36).SELECTED DRAWING: Figure 9

The utility model belongs to the technical field of feeding mechanisms, and particularly relates to a feeding mechanism of a sewing machine. The cloth feeding device comprises a bottom plate piece, a first supporting column and a second supporting column are inserted into a containing bin on one side of the bottom plate piece, a cloth feeding crank is arranged on the insertion section of the first supporting column in a sleeved mode, a feed lifting crank is arranged on the insertion section of the second supporting column in a sleeved mode, and a cloth feeding dog frame is connected between the cloth feeding crank and the feed lifting crank. A feed dog lifting crank is arranged on the feed dog frame, a driving rectangular block is arranged between the feed dog lifting crank and the feed dog frame, a feed dog assembly is arranged at one end of a long force arm part on one side of the middle of the feed dog frame, and a dog mouth part is arranged at the other end of the feed dog assembly. A long suspended cloth feeding structure is integrally formed, the device is suitable for special sewing material lengthening feeding components, product diversification is enriched, and market requirements are met.

This utility model discloses a novel small-head special multi-needle machine, including a needle clamp with multiple sets of needle mounting slots distributed on it. Each needle mounting slot contains a longitudinal needle. A needle plate is located below the needle clamp, and a feed dog is located below the needle plate. The needle plate has multiple sets of needle holes (B) that mate with the multiple longitudinal needles. The needle plate also has a set of feed dog grooves that mate with the teeth of the feed dog, with each tooth of the feed dog extending into the set of feed dog grooves. A needle presser foot is located above the needle plate, and the needle presser foot has a set of needle holes (A) that align with the sets of needle holes (B) and the longitudinal needles. The design allows for the simultaneous installation of multiple longitudinal needles in the needle clamp, and also includes a needle presser foot, needle plate, feed dog, and curved needle holder that can work with any number of longitudinal needles within a given range. The number of longitudinal needles on the needle clamp can be flexibly adjusted according to specific work requirements, making the overall operation more convenient and flexible.

The utility model discloses a feeding tooth structure and a sewing machine in the technical field of sewing machines. The feeding tooth structure comprises a feeding tooth body. The feeding main tooth is arranged above the feeding tooth body; and the auxiliary feeding teeth are arranged on one side of the main feeding teeth, the auxiliary feeding teeth are connected with the feeding tooth body, and the upper surfaces of the auxiliary feeding teeth are located above the upper surfaces of the main feeding teeth. The independent feeding mode is adopted, the auxiliary feeding teeth with the adjustable height are installed on one side of the main feeding teeth, the difference between the cloth feeding efficiency of upper-layer fabric and the cloth feeding efficiency of lower-layer fabric can be reduced, the phenomenon that the upper-layer fabric and the lower-layer fabric are staggered is avoided, and the cloth feeding device has the advantages of being simple in structure, low in cost and convenient to adjust. The method can be better accepted by clients.

This invention relates to a sewing method for preventing needle breakage in a sewing machine, comprising: a standard sewing mode: the feed dog moves along a set trajectory, the main shaft rotates at a uniform speed Va and drives the needle to move, and within one operating cycle time T, the time corresponding to when the needle tip is successively located at the needle plate plane, the highest position B, and the needle plate plane after the needle starts moving from the lowest point A is t. C t B and t D Thick-material anti-needle breakage sewing mode: The feed dog trajectory is the same as in the standard sewing mode, and the relationship between the spindle angle and the needle position is also the same; within the cycle time T, there are time points t0, t1, t2, t3, and t4. During the time period t0 to t2, the spindle decelerates; during the time period t0 to t1, the spindle speed is greater than Va; during the time period t1 to t2, the spindle speed is less than Va. The time when the needle tip is located on the needle plate plane is recorded as t. C0 , t C0 <t C During the time interval t2 to t4, the spindle accelerates; during the time interval t2 to t3, the spindle speed is less than Va; during the time interval t3 to t4, the spindle speed is greater than Va. The time when the needle tip is on the needle plate plane is recorded as t. D0 , t D0 >t D .

A stitch starting method for preventing material backfeeding in sewing a thick material by a sewing machine, comprising: on the basis of the size of a thick material (8) and the size of a presser foot (3) and the friction between the thick material and a needle plate (2), setting an anti-pushing reference position and a first stitch minimum stitch length ∆S, wherein when the thick material is located at the anti-pushing reference position, the distance between the front edge of a stitch starting position of the thick material and the central axis of a needle (4) is ∆S, an included angle θ between a lower pressing plane (31) and the surface of the needle plate is 0°, or tan (90°-θ)≥1 / μ; on the basis of the first stitch minimum stitch length ∆S and a placement position of the thick material on the needle plate, determining a position I of a feed dog (1) and a first feeding distance L1; before the thick material is placed, a main shaft (5) not moving, the feed dog first moving to the position I and stopping to place the thick material at the placement position, and the presser foot (3) pressing against the thick material; starting stitching, the feed dog being kept at the position I, and the main shaft first rotating to an angle A; and a feeding driving mechanism (7), a feed dog lifting driving mechanism (6) and the main shaft moving synchronously, the feed dog driving the thick material to move in a cloth feeding direction, and when reaching a position II, the feed dog just sinking below an upper surface of the needle plate, thereby completing first feeding. In the stitch starting method, the movement relationship between the feed dog and the needle is controlled when at the start of stitching, especially at the first stitch, enhancing support of the thick material in the horizontal direction by the feed dog and the friction, and effectively preventing the thick material from being pushed out by the presser foot at the start of stitching. In addition, provided is a se

The utility model relates to a driving device capable of adjusting the height of a feed dog, which comprises a driving connecting rod, an eccentric connecting rod, a pushing connecting rod, a connecting rod and a feed dog support, and further comprises an eccentric cam, the eccentric cam is composed of an outer eccentric cam and an inner eccentric cam, the outer eccentric cam is fixedly connected with a bearing, and the inner eccentric cam is eccentrically arranged in the outer eccentric cam. The inner eccentric cam is connected with the driving shaft; different heights of the cloth feeding teeth are achieved by adjusting different angles through the inner eccentric cam, and the problem that in the prior art, sewing and take-up of fabric with different thicknesses are difficult is solved.

The invention relates to a needle position adjusting device of sewing equipment and the sewing equipment of a double-needle machine, and the needle position adjusting device of the sewing equipment comprises two sets of shuttle frame assembly modules which are respectively used for being matched with machine needles of the sewing equipment; the two sets of shuttle frame assembly modules are respectively mounted on the lower shaft in a sliding manner; and the driving mechanism is used for driving the two sets of shuttle frame assembly modules to adjust the positions along the lower shaft by adopting a screw-nut pair. According to the needle position adjusting device, the positions of the two shuttle frame assembly modules are adjusted through the driving mechanism, so that the tedious operation of manually loosening a shuttle frame, adjusting feed dogs and replacing a needle plate during needle position replacement is effectively avoided, and the whole adjusting process is more efficient and accurate. Therefore, the technical scheme has the technical advantages of being low in operation difficulty, high in production efficiency, high in intelligent degree and good in adaptability to different garment process requirements.

The invention relates to the technical field of sewing machines, in particular to a cloth feeding device of an electric sewing machine, which comprises a needle plate, a presser foot and feed dogs, a presser foot groove is formed in the bottom face of the presser foot, a belt is installed in the presser foot groove through a freely-rotating roller, and a magnetic layer is arranged in the belt. The feed dog is of a toothless plane structure, the top surface of the feed dog is fixedly connected with at least one group of magnetic coupling heads, and a strong magnetic block array is embedded in the top surface of each magnetic coupling head; a magnetic attraction effect is generated between the magnetic coupling head and the magnetic belt, normal clamping force is generated on the upper surface and the lower surface of the multi-layer cloth, the maximum static friction force between the cloth layers and the feed dog / belt and between the cloth layers is remarkably enhanced through the clamping force, and therefore it is guaranteed that the multi-layer cloth serves as a whole to synchronously move along with the feed dog and the belt; and interlayer relative sliding between the cloth and between the cloth and the feed dog / belt is avoided.

The utility model belongs to the technical field of sewing machines, and particularly relates to a cloth feeding mechanism of a sewing machine, which comprises a feed dog frame, the tooth feeding assembly is connected to one end of the tooth frame and used for driving the tooth frame to move left and right; the feed lifting assembly is connected to the other end of the feed rack and used for driving the feed rack to move up and down; the feed lifting assembly comprises a feed lifting cam, a feed lifting connecting rod and a traction connecting rod, one end of the traction connecting rod is used for being hinged to a rack, and the other end of the traction connecting rod is hinged to the output end of the feed lifting crank. The lifting period of the feed dog frame is changed through the feed lifting connecting rod and the traction connecting rod, so that when the feed lifting assembly drives the feed dog frame to be lifted, the feed dog assembly can synchronously drive the feed dog frame to move left and right, and therefore a movement track which is overall in an oval shape is formed, and the cloth feeding mechanism has a better cloth feeding effect.

This invention belongs to the field of sewing machine technology, specifically relating to a lower feeding mechanism for a sewing machine, including a motor, a feeding shaft assembly, and a feed dog lifting shaft. A feeding crank (first) is mounted at the rear end of the outer feeding shaft, and a feeding crank (second) is mounted at the rear end of the inner feeding shaft extending from the outer feeding shaft. The other end of the second feeding crank is connected to a motor connecting rod, and the other end of the motor connecting rod is connected to a motor crank, which is mounted on the outer circumference of the motor's main shaft. A feed dog lifting crank is mounted at the rear end of the feed dog lifting shaft. A synchronous connecting rod (first) connects the first feeding crank to the feed dog lifting crank, and a synchronous connecting rod (second) connects the second feeding crank to the feed dog lifting crank. A feed dog lifting crank (first) is mounted at the front end of the outer feeding shaft, and a feed dog lifting crank (second) extends from the front end of the inner feeding shaft extending from the outer feeding shaft. Through the design of the motor, this invention allows for individual control of the speed of the lower feeding dog, thereby adjusting the fabric feeding speed and enabling diverse sewing operations. Operation and control are convenient.

The invention discloses a hemming folder and a sewing device, and relates to the technical field of sewing, the hemming folder comprises a folder body and an air pipe assembly, the folder body is provided with a hemming channel for hemming cloth to pass through, and the hemming channel comprises a main body part, a first hemming part and a second hemming part; the second hemming part is used for being arranged at the position closer to a feed dog of the sewing device than the first hemming part. The air pipe assembly is used for being connected with an air source device, the air source device supplies air into the edge covering channel through the air pipe assembly, the air pipe assembly is provided with a first air outlet and a second air outlet, the first air outlet and the second air outlet are both communicated with the main body part, and airflow supplied by the air source device is blown out through the first air outlet and the second air outlet. And airflow blown out of the first air outlet and the second air outlet is used for blowing the edge covering cloth to the discharging opening of the edge covering channel, so that automatic pushing and moving of the edge covering cloth are achieved, the pushing speed can be guaranteed to be stable, and a seam allowance formed by the edge covering cloth is moderate in tightness.