311 results about "Feed dogs" patented technology

The invention provides a sewing machine. The sewing machine comprises an upper shaft driven by a first motor, a needle bar take-up mechanism arranged at one end of the upper shaft, a lower shaft parallel to the upper shaft, a thread take-off mechanism arranged at one end of the lower shaft, a feed dog frame and a feed dog fixed to the feed dog frame. The upper shaft is connected with the lower shaft through a drive unit. The upper shaft is connected with one end of the feed dog frame through a feed dog lifting mechanism. The sewing machine further comprises a second motor connected with the other end of the feed dog frame through a cloth feed mechanism. The feed dog lifting mechanism and the cloth feed mechanism which form a feed mechanism are driven by the two motors respectively, and therefore the output amount of the cloth feed mechanism can be regulated by regulating the output amount of the second motor, the movement tracks of the feed dog frame and the feed dog can be conveniently changed, and sewing of various patterns can be achieved.

The invention provides a cloth feeding mechanism for automatically improving coiling. The mechanism comprises a tooth frame, a feed dog fixed at an upper end of the tooth frame, a lifting assembly which is connected with one end of the tooth frame and is used for driving the tooth frame to reciprocate down and up, and a feeding assembly which is connected with the other end of the tooth frame andis used for driving the tooth frame to reciprocate back and forth and further includes a lifting driving motor which is independent of a main motor of a sewing machine, wherein the lifting driving motor is connected with the lifting assembly to drive the lifting assembly to move. The cloth feeding mechanism is advantaged in that the phase of the lifting assembly can be adjusted, a main shaft driven by the main motor in the sewing machine and a threading and needling mechanism connected with an end portion of the main shaft can be in the non-synchronous relationship, so the time point t1 at which the feed dog emerges upward from a needle plate and the time point t2 at which the feed dog sinks down into the needle plate can be changed, that is, cloth can be delivered in advance or delayed, suture tightening degrees are different, so the sewing machine has different tightening effects, and the sewing machine can be well adapted to sewing materials having different thicknesses.

A zigzag sewing machine is provided. The zigzag sewing machine includes a stitching motor which moves a needle, a feeding motor which moves a feed dog to feed a cloth, a needle swinging motor which swings the needle, a multistage-operating portion operable to adjust at least one of a feed amount of the cloth and a swing amount of the needle in a minimum adjustable unit, and a control section which controls the stitching motor, the feeding motor and the needle swinging motor to carry out a zigzag sewing in accordance with the at least one of the feed amount and the swing amount adjusted by the multistage-operating portion. The control section is configured to selectively assign a first value and a second to the minimum adjustable unit depending on whether the stitching motor is in operation or not.

The invention provides a cloth feeding mechanism with a stitch length adjusting function. The cloth feeding mechanism comprises a main shaft and a cloth feeding shaft parallel to the main shaft. The main shaft is eccentrically sleeved with a cloth feeding connecting rod, and the end, away from the main shaft, of the cloth feeding connecting rod is hinged to the end of a first small connecting rod and the end of a second small connecting rod through a cloth feeding connecting rod pin. The end, away from the cloth feeding connecting rod pin, of the first small connecting rod is hinged to one end of a stitch length swing rod, a rotating shaft parallel to the main shaft is arranged in the middle of the stitch length swing rod, the stitch length swing rod is further connected with a stitch length adjusting component, and the stitch length adjusting component drives the stitch length swing rod to rotate around the rotating shaft of the stitch length swing rod. The end, away from the cloth feeding connecting rod pin, of the second small connecting rod is hinged to the end of a cloth feeding swing rod, the cloth feeding swing rod is fixed to the cloth feeding shaft, the cloth feeding shaft is further fixedly sleeved with a cloth feeding crank, the cloth feeding crank is connected with a main cloth feeding dog frame through a connecting rod, and the main cloth feeding dog frame is fixedly connected with a main cloth feeding dog and moves back and forth in the direction parallel to the extending direction of the main cloth feeding dog under driving of the cloth feeding crank.

A needle plate for a sewing machine includes a first needle plate fixed to a sewing machine bed and formed with a needle hole through which a needle passes and a rectangular hole through which a feed dog appears, a second needle plate disposed in front of the first needle plate and detachably attached to the first needle plate, an engagement mechanism sliding the second needle plate rearward from a front side of the first needle plate, thereby engaging the second needle plate with the first needle plate, and a disengagement operating member located on the second needle plate so as to operate the engagement mechanism so that the second needle plate is disengaged from the first needle plate. The disengagement operating member is moved frontward from a rear side of the first needle plate thereby to disengage the second needle plate from the first needle plate.

The invention relates to the sewing machinery field, in particular to a cloth feed dog frame for a sewing machine. The cloth feed dog frame for the sewing machine comprises a frame body and a feed dog installed on the frame body, and further comprises a rocking arm mechanism which is connected with the frame body and enables the frame body to move left and right, and a dog lifting mechanism which moves the feed dog up and down, wherein a slide chute is formed in the front side of the middle of the frame body, a slide block is matched in the slide chute, the feed dog is fixed on the slide block through a second locking bolt, an adjustment groove matched with the second locking bolt is formed in the feed dog, one side of the feed dog is attached to the frame body, a cushion plate is further arranged between the other side of the feed dog and the frame body, and the cushion plate is fixed on the frame body through a fixing bolt. The cloth feed dog frame for the sewing machine can adjust the height of the feed dog so as to meet different demands, and simultaneously can further reduce abrasion rate of the feed dog, and prolongs use life of the feed dog.

The invention provides an improved sewing machine direct-driving feeding mechanism. The mechanism comprises a motor, a horizontal feeding shaft (1), a vertical feeding shaft (2), a feed dog pickup fork (3), a small assembly (4) for a feed dog frame and a feed dog (5), wherein the feed dog pickup fork (3) is arranged on the vertical feeding shaft (2); the small assembly (4) for the feed dog frame is arranged on the horizontal feeding shaft; and the feed dog (5) is installed on the small assembly (4) for the feed dog frame. In the mechanism, the horizontal feeding shaft (1) is directly driven by a motor, and the vertical feeding shaft is driven by the main shaft motor of the sewing machine. The two motors both can be connected to a computer and are directly programmed to control so as to change the feeding track and parameter of the feed dog. The mechanism has the advantages of stable feeding effect, accurate feeding displacement and convenience in control.

The invention provides a staggering preventing device of a sewing material. The staggering preventing device comprises a tooth rack provided with a fixed swinging supporting point, a feed dog arranged at one end of the tooth rack, a rotatable eccentric shaft and a driving mechanism for driving the eccentric shaft to rotate, wherein a first sliding groove is formed in the other end of the tooth rack; the fixed swinging supporting point of the tooth rack is located between the feed dog and the first sliding groove; the eccentric shaft comprises a shaft body part and a shaft eccentric part which is eccentrically arranged on the shaft body part; the shaft body part is connected with the driving mechanism; the shaft eccentric part is rotatably mounted in the first sliding groove of the tooth rack and is in sliding matching with the first sliding groove; when a presser foot is lifted or after the presser foot is lifted, the driving mechanism drives the tooth rack to downward move toward one end of the feed dog on the tooth rack through the eccentric shaft, so that the feed dog is descended to the lower side of a needle plate; a distance between the needle plate and the presser foot in a feeding process before sewing is enlarged and the sewing material is not in contact with the feed dog, so that the material is convenient to feed; a condition that the sewing material has staggering and layering phenomena before sewing can also be avoided.

A walking foot for a sewing machine includes a presser foot having a pair of supported portions, an upper feed dog feeding workpiece cloth in synchronization with vertical movement of a needlebar, a supporting member fixed to a lower end of the presser bar and having a pair of engagement supporting portions supporting the presser foot, a swinging supporting mechanism engaging the engagement supporting portions with the supported portions from horizontally outside respectively so that the presser foot is supported on the supporting member so as to be swingable, and a disengaging mechanism moving at least one of the engagement supporting portions horizontally outward from an engagement position where the engagement supporting portion is in engagement with the supported portion of the presser foot, thereby being capable of switching the engagement supporting portion to a disengagement position where the engagement supporting portion is disengaged from the supported portion.

The feeding device for the sewing machine is provided with: a feeding transmission mechanism 20 for transporting fabrics in a prescribed direction by swinging a feed dog 11 so as to come in contact with and leave the fabrics; an angle piece 30 for changing the amount of feeding of the feeding transmission mechanism; a stepping motor 50 for driving the angle piece; and a CPU 80 for controlling the amount of driving of the stepping motor so as to change the amount of feeding. The feeding device is further provided with: an operation lever 6 having a prescribed operable range Sa; a potentiometer 70 for detecting the amount of operation of the operation lever; and a program 110 for setting the amount of feeding for setting the correspondence relation between the amount of operation of the lever and the amount of feeding. The CPU controls the amount of driving of the stepping motor so as to change the amount of feeding corresponding to the amount of operation of the lever on the basis of the correspondence relation set by the program for setting the amount of feeding. To provide an easily operable feeding device for a sewing machine wherein the amount of feeding can be freely adjusted according to various kinds of sewing situations and the skill/liking of an operator.

The invention provides a differential cloth-feed adjusting structure and a sewing machine. The differential cloth feed adjusting structure comprises a differential ratio adjusting part and a driving part, wherein the differential ratio adjusting part comprises a manual adjusting component, a differential connecting piece and a cloth-feed connecting rod; the manual adjusting component is in transmission connection with the differential connecting piece; one end of the cloth-feed connecting rod is hinged to the differential connecting piece and a differential connecting rod, so as to form a differential hinge point; the manual adjusting component is used for changing the position of the differential hinge point through the differential connecting piece; the differential connecting rod is connected to a differential feed dog rack; the differential feed dog rack is connected with a differential feed dog; the driving part comprises a feed connecting rod arranged on a spindle of the sewing machine, a cloth-feed shaft, a cloth-feed crank and a differential swing rod; the cloth-feed crank and the differential swing rod are fixed on the cloth-feed shaft in such a manner that preset included angles are formed between the cloth-feed crank and the differential swing rod; the feed connecting rod is connected with the cloth-feed crank; the differential swing rod is hinged to the other end of the cloth-feed connecting rod. According to the differential cloth-feed adjusting structure and the sewing machine, all the parts are easy to machine, and simple to mount, and the precise adjustment of the differential ratio is guaranteed.

The feed dog adjustment device, includes a feed rock shaft, rotatably attached to a sewing machine frame with an eccentric shaft provided at an eccentric position with respect, to a center, a feed rock shaft crank that, slides about the feed rock shaft, a feed bar rotatably attached to the feed rock shaft, crank, a feed dog provided on the feed bar, an actuator for inclination adjustment that rotates the eccentric shaft, and a controller that drives the actuator for inclination adjustment to adjust an inclination of the feed dog on a basis of data related to a type and stretchability of fabric.

The invention provides a feed mechanism of a sewing machine. The feed mechanism comprises a main motor, a cloth feed motor, a feed dog frame and a feed dog fixed to the feed dog frame. The main motor is connected with the feed dog frame through a feed dog lifting mechanism. The cloth feed motor is connected with the feed dog frame through a cloth feed mechanism. The cloth feed mechanism comprises a drive connection rod, a swing connection rod and a feed dog base supported in a bottom plate of the sewing machine in a rotatable mode. One end of the drive connection rod is fixedly connected with an output shaft of the cloth feed motor, and the other end of the drive connection rod is hinged to one end of the swing connection rod. The other end of the swing connection rod is hinged to the feed dog base. The feed dog base is hinged to one end of the feed dog frame. In the feed process, the output shaft of the cloth feed motor swings once in a reciprocating mode within the regulated angle alpha, the feed dog frame and the feed dog can reciprocate twice in a front-back mode together relative to the bottom plate, and therefore the rotation direction switching frequency of the output shaft of the cloth feed motor is greatly decreased, the synchronism between drive of the main motor and drive of the cloth feed motor is ensured, and the sewing quality is improved.

The invention discloses a method for monitoring a computer operating system in the system starting process without increasing hardware cost or influencing system starting time. The method comprises the following steps of (1) after the system is powered on and started, opening real-tine interruption, and pre-loading an interruption module code of the system and a dog feeding scheme code in the system starting process as an emergency loading part into the system; (2) executing the dog feeding scheme code in the emergency loading part, and completing dog feeding by periodically triggering the real-tine interruption with an appointed timer by means of the opened real-time interruption; (3) appointing a counter in a dog feeding function to judge whether system start is overtime or not, and if the system start is overtime, not feeding dog and reloading by using a hardware watchdog rest system; (4) after the start is completed, relieving the appointed timer in a system task, and submitting a hardware watchdog to software of the system for arrangement. The method can solve the problem that the system start fails because the dog cannot be fed in the system starting process.

In this invention, a small presser foot elastically pressing a fabric on the downstream side of a sewing direction of a needle location hole against moveable feed dogs on the top face side of a needle plate is mounted, a pair of right and left rotors and elastically pressing the fabric against the moveable feed dogs by the peripheral lower ends and are provided, and the straight line distance along the sewing direction between the peripheral lower ends and of the pair of right and left rotors and the pressing portion of the small presser foot is reduced as much as possible to the extent that there is no interference with operation. Accordingly, this invention is able to reliably, smoothly and uniformly feed fabric without necessitating the trouble of applying oil when sewing the less smooth fabric and easily carrying out a curve stitch and a fancy stitch.

The invention relates to a controllable watchdog reset system, comprising a watchdog circuit and a microprocessor, and a system power supplying power for the watchdog circuit and the microprocessor. An isolation circuit is connected between the watchdog circuit and the microprocessor. When the system power normally supplies power, the isolation circuit transmits a reset signal of a reset pin of the watchdog circuit to a reset terminal of the microprocessor, and transmits a feeding-dog signal of I/O pin of the microprocessor to a feeding-dog pin of the watchdog circuit; when the system power is outage, the isolation circuit stops to cut off the contact between the watchdog circuit and the microprocessor. The invention has the effects of reducing system power dissipation, improving the service life of battery, and at the same time precluding a system reset problem caused by working wrongly of the watchdog circuit, and greatly improving reliability of the system.

The invention provides a jumper-free circuit for program running and JTAG program downloading. The jumper-free circuit comprises a CPU, a watchdog chip and a JTAG writer, wherein the CPU outputs a feeding-dog signal to the watchdog chip; a first signal RSTM is output by a watchdog reset signal RESET-WD output by the watchdog chip and a power supply signal SWD-3.3V of the JTAG writer through a 'or' logic; a second signal RESET-CPU is output by the first signal RSTM and a JTAG reset signal SWD-RST output by the JTAG writer through an 'and' logic; the signal is input into the CPU as a CPU reset signal; and the JTAG writer interacts with the CPU through data, clock and reset signals. The jumper-free circuit has the advantage that circuit switching devices such as a change-over switch and a dial switch are avoided, and is free of a jumper, high in reliability and low in cost; the JTAG program downloading and debugging time is greatly shortened; the area of a printed circuit board (PCB) is reduced; the production efficiency is improved; and meanwhile, the product running reliability is also increased.

An empty chain locking member is mounted on a chain stitch sewing machine comprising a needle for penetrating through a cloth on a throat plate to be vertically moved interlockingly with a main spindle of the sewing machine, thereby holding a needle thread, a cloth presser mounted on the throat plate and serving to press the cloth, a looper having a looper thread for reciprocating in such a direction as to cross a cloth feeding direction below the throat plate interlockingly with the main spindle of the sewing machine, a main feed dog for feeding a loop formed by the needle thread and the looper thread in cooperation of the needle and the looper rearward in the cloth feeding direction, and a loop engagement member for protruding from an upper surface of the throat plate and engaging the loop with the cloth presser when the main feed dog is descending from the upper surface of the throat plate. The present invention aims to facilitating setting of cloth between a cloth presser and a throat plate and to surely form an empty chain.

The invention relates to the technical field of mechanisms of sewing machines, in particular to a cloth feed mechanism of a sewing machine. The cloth feed mechanism of the sewing machine aims to solve the problems that potential safety hazard exists, cost is high and working efficiency is low in the prior art. The cloth feed mechanism for the sewing machine comprises a cloth feed shaft, a feed lifting rock shaft, a cloth feed crank, a feed frame, a second frame, a first cloth feed dog and a second cloth feed dog, wherein the cloth feed crank is provided with double-end drive ends which are perpendicularly and symmetrically arranged by 180 degrees. The cloth feed mechanism of the sewing machine is characterized by further comprising a feed lifting rock shaft crank, the cloth feed shaft and the cloth feed crank connected with the cloth feed shaft are located at the front portion in the cloth feed direction, the feed lifting rock shaft is a swinging shaft and located at the rear portion in the cloth feed direction, the feed lifting rock shaft crank is of a double-crank structure arranged in the cloth feed direction by 180 degrees, the middle of the feed lifting rock shaft crank is connected with the feed lifting rock shaft, the end of the first feed frame is connected with the crank structure at the front portion through a first feed lifting connection rod, and the end of the second feed frame is connected with the crank structure at the rear portion through a second feed lifting connection rod.