54results about How to "Guaranteed sewing quality" patented technology

The invention provides a sewing material detecting device for a sewing machine. The sewing machine comprises a machine head and a table plate. The sewing material detecting device for the sewing machine is characterized in that the sewing material detecting device comprises a mounting plate, a circuit board and a sewing material thickness detector, the mounting plate is fixed to the machine head, the circuit board and the sewing material thickness detector are fixed on the mounting plate, the circuit board comprises a micro-control unit, the sewing material thickness detector exactly faces the table plate, and the sewing material thickness detector is connected with the micro-control unit through the circuit board. The sewing material detecting device for the sewing machine is mounted on the machine head of the sewing machine, the thickness of sewing materials to be sewn on the table plate of the sewing machine can be accurately detected through the sewing material thickness detector and the micro-control unit, the lifting height of presser feet is adjusted accurately according to the detected thickness of the sewing materials, a strong basis is provided for the adjustment of the lifting height of the presser feet, and accurate full automatic control over the sewing machine can be ensured.

The invention discloses a middle presser foot mechanism of a sewing machine. The mechanism comprises a presser foot rod and a driving device driving the presser foot rod to move up and down, wherein the presser foot rod is arranged in a shell of the sewing machine. The driving device comprises a servo motor and a control unit, wherein the servo motor is fixed in the shell of the sewing machine; the output shaft of the servo motor is connected with a gear shaft through a connecting head; and the control unit gives out a servo motor start or stop control signal according to a selected instruction of an operator to control the servo motor to start or stop. A rack is arranged on the upper part of the presser foot rod; a middle presser foot is fixed to the lower end of the presser foot rod; and the rack is meshed with a gear on the gear shaft. In the middle presser foot mechanism, the middle presser foot is driven through an independent servo motor and has nothing to do with the motion of a main shaft of a machine needle; and whether the middle presser foot is matched with the needle of the sewing machine or not is manually selected according to different sewing fabrics and processes, so the abrasion of the middle presser foot mechanism is reduced and the sewing speed is increased at the same time.

The invention discloses a hemming sewing machine with an automatic conveying function. The hemming sewing machine comprises a rack, a worktable and a sewing machine head, wherein the workable and the sewing machine head are arranged on the rack. A conveying bottom plate is arranged on the worktable, and a synchronous belt conveying mechanism for linearly moving sewing materials along the conveying bottom plate is arranged above the conveying bottom plate. Two installing supports are fixed to the worktable, each installing support is provided with a universal bearing, each universal bearing is provided with a movable connecting shaft, and the lower ends of the movable connecting shafts are connected with the top of the synchronous belt conveying mechanism. Balance pressing blocks are fixed to the installing supports, and the bottoms of the balance pressing blocks are provided with springs for applying elastic pressure to the top of the synchronous belt conveying mechanism. By adopting the hanging structure of the universal bearings and applying the elastic pressure through the springs, the working posture of the synchronous belt conveying mechanism can be automatically adjusted, installing and adjusting are convenient, conveying of sewing materials of different thicknesses is convenient, and the sewing material hemming and sewing quality is guaranteed.

The invention provides an over-step speed reducer of a sewing machine. The over-step speed reducer of the sewing machine comprises an electric control module of the sewing machine, a main motor for driving the sewing machine to operate, a presser foot seat and a presser foot plate, and further comprises a pressure spring and a pressure sensor fixed on the presser foot plate, wherein one end of the presser foot plate is a feeding end, the presser foot plate is hinged to the lower end of the presser foot seat and is provided with a fixed swinging fulcrum, the upper end and the lower end of thepressure spring are separately butted to the presser foot seat and the pressure sensor, and the main motor and the pressure sensor are both connected with the electric control module; and the pressuresensor, the fixed swinging fulcrum of the presser foot plate and the feeding end of the presser foot plate are sequentially arranged from front to back along the feeding direction of forward feedingof the sewing machine. In the sewing process, the electric control module can judge whether it passes through steps or not during sewing in real time through the output signal of the pressure sensor,and when it passes through the steps during sewing, the electric control module immediately controls the sewing machine to reduce the speed for sewing, so that the speed of the sewing machine is reduced in time, speed reduction delay does not exist, thread breakage, needle breakage and the like can be effectively avoided, and finally the sewing quality is guaranteed.

The invention discloses a waist portion pulling machine. The waist portion pulling machine is characterized by comprising a workbench, a sewing assembly, an upper pulling wheel assembly and a lower pulling wheel assembly. The sewing assembly comprises a sewing machine head. The sewing machine head is fixedly arranged on a rack of the workbench. The upper pulling wheel assembly comprises an upper left pulling wheel assembly and an upper right pulling wheel assembly. The upper left pulling wheel assembly and the upper right pulling wheel assembly are successively and fixedly arranged on the leftportion of the back side of the sewing machine head from left to right and located behind a needle of the sewing machine head. The upper left pulling wheel assembly comprises an upper left pulling wheel, and the upper left pulling wheel is a drive wheel. The upper right pulling wheel assembly comprises an upper right pulling wheel, and the upper right pulling wheel is a drive wheel. The lower pulling wheel assembly comprises a lower front pulling wheel, and the lower front pulling wheel is a drive wheel. The lower front wheel is rotatably arranged on the lower left portion of the sewing machine head and located below the upper pulling wheel assembly. The upper left pulling wheel of the upper left pulling wheel assembly, the upper right pulling wheel of the upper right pulling wheel assembly and the lower front pulling wheel of the lower pulling wheel assembly clamp a cloth material and pull the cloth material out of the sewing machine head.

The invention discloses an elastic cord positioning and sewing device and sewing method for use in garment processing. An electric sewing machine comprises a body and a base; a guide support mechanismis arranged on the right side of the upper end of the base of the electric sewing machine; a working plate is arranged at the upper end of the guide support mechanism; a sewing guide mechanism is arranged on the right side of the base of the electric sewing machine and is fixedly connected with the right side of the working plate; a sewing and positioning mechanism is arranged on the right side of the upper end of the working plate; a conveying mechanism is arranged on the left side of the working plate; a compression mechanism is arranged at the right end of the conveying mechanism and fitsa sewing needle structure of the body of the electric sewing machine; a suction fixing mechanism is arranged at the bottom of the compression mechanism; the edge of a sewing position of a garment andan elastic cord can be compressed, the garment and the elastic cord can be sewn along a sewing direction, the elastic cord can be gripped accurately and released quickly; elastic cord positioning is accurate, reasonable and efficient; sewing quality is guaranteed, workload is reduced for personnel, and positioning and sewing efficiency is improved.

The invention discloses an intermediate presser foot lifting structure of a pattern-sewing machine. The intermediate presser foot lifting structure comprises a controllable motor, a driving gear, a driven gear, an intermediate presser foot lifting shaft and a lifting connecting rod, the controllable motor is connected with the driven gear which is in threaded connection with the driven gear, one end of the intermediate presser foot lifting shaft is connected with the driven gear, and the other end of the intermediate presser foot lifting shaft is connected with the lifting connecting rod. By the intermediate presser foot lifting structure of the pattern-sewing machine, height change of an intermediate presser foot can be controlled, and the height of the intermediate presser foot can be changed along with the thickness of materials when the materials different in thickness are sewed.

The invention provides a sewing machine, belongs to the technical field of sewing devices, and solves the problem that an existing sewing machine easily affects sewing quality when adjusting a fabric.The sewing machine comprises a needle plate, an adjusting plate is slidably connected with the lower portion of the needle plate, two material clamping seats are connected at two ends of the adjusting plate, two yielding notches are formed in the needle plate, the two material clamping seats penetrate upwards the two yielding notches, material clamping rods are slidably connected on the materialclamping seats, a plurality of material clamping wheels are rotatably connected at the lower ends of the material clamping rods, material clamping springs are arranged on the material clamping seats,the material clamping wheels fall by the material clamping springs, fabrics are closely clamped on the material clamping seats by the material clamping springs, an adjusting motor is arranged below the needle plate and can drive the adjusting plate to reciprocate when the fabrics are closely clamped by the material clamping wheels, and a releasing mechanism is arranged on the adjusting plate and can drive the material clamping wheels to rise and release the fabrics when the fabrics are adjusted in place. According to the sewing machine, a sewing path of a large fabric can be adjusted, and thesewing quality is improved.

The invention provides a sewing machine, comprising a lower feeding mechanism. The lower feeding mechanism has a feed dog which does reciprocating motion front and back and up and down. An upper end of the feed dog has a lower feeding portion. The lower feeding portion is used to contact with a lower layer cloth, and drive the lower layer cloth to move forward. The sewing machine also comprises anupper feed mechanism. The upper feeding mechanism has cloth feeding presser feet which does reciprocating motion front and back and up and down. The lower end of the cloth feeding presser foot has anupper feeding portion. The upper feeding portion is used to contact with an upper layer cloth, and drive the upper layer cloth to move forward. In the sewing machine, the upper feeding mechanism feeds the upper layer cloth forward, and feeding delay of the upper layer cloth is effectively prevented, so that staggered layer phenomenon occurred between the two layers of cloths is eliminated, and sewing quality is guaranteed.

The invention provides a feed lifting height adjusting method for a sewing machine. The sewing machine is provided with a main shaft, a feed lifting shaft parallel to the main shaft, a feed frame, a feed dog installed on the feed frame, a first feed lifting transmission assembly connected between the main shaft and the feed lifting shaft, and a second feed lifting transmission assembly connected between the feed lifting shaft and the feed frame. The feed lifting height adjusting method comprises the following steps: 1, a feed lifting height adjusting mechanism is arranged in the sewing machine, and the feed lifting height adjusting mechanism acts on the first feed lifting transmission assembly; 2, when feed lifting height needs to be adjusted, the feed lifting height adjusting mechanism acts to change the transmission efficiency of the first feed lifting transmission assembly, so that the swing amplitude of the feed lifting shaft driven by the main shaft through the first feed lifting transmission assembly is changed, and thus the feed lifting height of the feed dog is adjusted, the universality of the sewing machine is greatly improved, and therefore, the adaptability of the sewing machine to different sewing materials is greatly enhanced, and the competitiveness of products is improved.

The invention relates to a bind-off-machine presser foot for feeding a shoulder strap. The bind-off-machine presser foot comprises a bind-off-machine presser foot body (1) and is characterized in that a needle hole (2) is formed in the right of the middle portion of the presser foot body (1), a boss (3) is arranged on the front section of the presser foot body (1), a presser foot opening (4) is formed in the right of the presser foot body (1) in front of boss (3), a guide plate (5) is mounted onto the boss (3) through a screw, and a guide plate opening (6) is formed in the left of the guide plate (5) and located at a position in front of and above the presser foot opening (4). The bind-off-machine presser foot has the advantages that during shoulder strap feeding, the shoulder strap sequentially penetrates the guide plate opening and the presser foot opening and is sewn to fabric, the feeding direction of the shoulder strap is controlled automatically, and the presser foot is capable of facilitating shoulder strap feeding and guaranteeing sewing quality.

The invention provides a control device for a sewing machine. The control device comprises a workbench, a sewing device arranged on the workbench, a thread trimming device arranged on the workbench and a foot rest, wherein the thread trimming device is connected with a controller; the foot rest is connected with a first connecting rod; the outside of the first connecting rod is sleeved by a connecting frame; a first fixed part is arranged above the connecting frame, and a second fixed part is arranged below the connecting frame; a spring is arranged between the connecting frame and the second fixed part; the upper end of the first fixed part is provided with a contact; the connecting frame is connected with a contact switch matched with the contact; the contact switch is connected with the controller; the connecting frame is fixedly connected with a second connecting rod; and the upper end of the second connecting rod is provided with a switch arm connected with the sewing device. By using the control device for the sewing machine, provided by the invention, a sewn fabric thread can be automatically trimmed within the first time after the sewing machine stops sewing by virtue of the foot rest, and manual thread trimming is not needed.

The invention provides an improved sewing machine take-up lever structure. In the sewing process, when a take-up lever runs to different positions, the thread feeding amount of an upper thread and thepulling force of the upper thread are kept stable, therefore it is further guaranteed that stitches in the sewing process of clothes are stable, and the sewing effect and sewing quality of the clothes are better improved. The improved sewing machine take-up lever structure comprises a sewing machine take-up lever body, the sewing machine take-up lever body is provided with a threading hole whichis a long slotted hole, and the improved sewing machine take-up lever structure is characterized in that the long slotted hole is provided with a transverse notch.

The invention relates to a frame for sewing. The frame comprises a support plate and four support legs. Connection lines of the four support legs form an isosceles trapezoid. A hinge seat is arranged at the lower end of the support plate and comprises a first hinge plate and a second hinge plate hinged to the first hinge plate. The support legs are fixed on the second hinge plate. Anti-vibration pads are arranged at the bottom ends of the support legs. The frame is simple in structure. The support legs can be folded and are not interfered by each other, the size is reduced, and transportation convenience is obtained. By means of a scrap storage groove, scraps can be collected quickly without mess. The anti-vibration pads are arranged at the bottom ends of the support legs, so that vibration is avoided, operators are protected from vibration effects, and sewing quality is guaranteed.