CN113463283A - Feed lifting motor and cloth feeding motor of sewing machine - Google Patents

Abstract

The application provides a feed lifting motor and a cloth feeding motor of a sewing machine, and particularly relates to the technical field of sewing machine manufacturing. The feed delivery motor drives the feed delivery shaft in a repeated back-and-forth swinging operation mode. The needle pitch of the sewing machine can be adjusted at will in the control system, the defect that the original sewing machine generally only has one specific needle pitch is overcome, the automatic needle pitch adjustment of the needle pitch of the sewing machine is realized, one machine is realized to have a plurality of needle pitches, and the high popularization and use value is achieved.

Description

Feed lifting motor and cloth feeding motor of sewing machine

Technical Field

The application provides a feed lifting motor and a cloth feeding motor of a sewing machine, and particularly relates to the technical field of sewing machine manufacturing.

Background

In a driving mechanism of the sewing machine, a main motor is arranged on a machine head of the sewing machine and is connected with an output main shaft, an eccentric wheel is fixedly arranged on the output main shaft, and the main motor rotates to drive a cloth feeding connecting rod and a feed lifting connecting rod to move. The cloth feeding connecting rod drives the cloth feeding shaft to rotate at a certain angle through the swinging seat component, and the feed lifting connecting rod drives the feed lifting rock shaft to swing at a certain angle through the feed lifting rock crank; the swing of the cloth feeding connecting rod and the cloth feeding shaft drives the cloth feeding tooth rack to swing so as to generate back-and-forth motion for the cloth feeding tooth; the feed dog connecting rod and the feed dog shaft swing to drive the feed dog fork on the feed dog shaft to swing so as to enable the feed dog to move up and down, and the forward and backward movement and the up and down movement are combined to form the feed action of the feed dog.

Aiming at a swinging seat for controlling the needle pitch, a plurality of enterprises put forward an intelligent control technical scheme for realizing the cloth feeding needle pitch. The cloth feeding device is characterized by further comprising a swing rod, the cloth feeding shaft driving source is provided with an output shaft, the swing rod is mounted on the output shaft, the swing rod is connected with the crank through a hinge, the connecting crank is fixed on the cloth feeding shaft, the cloth feeding shaft is movably connected with the cloth feeding tooth rack, and the cloth feeding tooth rack is fixedly provided with the cloth feeding tooth. In fact, the proposal utilizes the cloth feeding shaft driving source to drive the swing rod to replace a cloth feeding connecting rod of the original sewing machine, carries out the stitch length adjustment on the stitch length adjusting mechanism and positions the zero point position of the cloth feeding teeth on the zero position positioning mechanism, and achieves the positive stitch length adjusting technical effect. However, the movement of the feed lifting connecting rod still remains in the prior art, so that the cloth feeding action of the feed dog cannot reach the intelligent control level.

In addition, the existing needle pitch adjusting mechanism comprises a dial button positioned outside the sewing machine shell, a dial stud in threaded connection with the sewing machine shell, a feeding adjuster and a reverse feeding connecting rod, wherein the dial button is fixed with the front end of the dial stud, the rear end of the dial stud is abutted against the front end surface of the feeding adjuster, the rear end of the feeding adjuster is hinged with the upper end of the reverse feeding connecting rod, and the lower end of the reverse feeding connecting rod acts on a feeding transmission component connected between a sewing machine main shaft and a feeding shaft. When the needle pitch needs to be adjusted, an operator manually rotates the dial button, the dial button drives the dial stud, the dial stud can move forwards or backwards while rotating, and then the position of the component connected with the inverted feeding connecting rod in the feeding transmission component is changed through the feeding adjuster and the inverted feeding connecting rod, so that the swinging amplitude of the spindle driving the feeding shaft to swing is changed, the stroke of the tooth frame moving forwards and backwards is changed, and the needle pitch adjustment is realized. However, the above-described needle pitch adjustment mechanism has the following drawbacks: the manual adjustment is adopted, so the operation is troublesome, the operation is passive, and the needle pitch can not be automatically adjusted in the sewing process.

Disclosure of Invention

Aiming at the defects in the existing needle pitch adjusting technology, the technical problem to be solved by the application is to realize the automatic adjustment of the needle pitch of the sewing machine, realize the sewing machine with a plurality of needle pitches, and provide a feed motor and a feed shaft of the sewing machine.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 24.5 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 9 degrees in a repeated back-and-forth swinging mode, so that the stitch length of the sewing machine is 8 MM.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 22.5 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 7 degrees in a repeated back-and-forth swinging mode, so that the stitch length of the sewing machine is 8 MM.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 20.5 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 5 degrees in a repeated back-and-forth swinging mode, so that the stitch length of the sewing machine is 8 MM.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 22.7 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 9 degrees in a repeated back-and-forth swinging mode, so that the 7MM stitch length of the sewing machine is formed.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 20.7 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 7 degrees in a repeated back-and-forth swinging mode, so that the 7MM stitch length of the sewing machine is formed.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 18.7 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 5 degrees in a repeated back-and-forth swinging mode, so that the 7MM stitch pitch of the sewing machine is formed.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 15.8 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 9 degrees in a repeated back-and-forth swinging mode to form the needle pitch of the sewing machine of 5 MM.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 13.8 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 7 degrees in a repeated back-and-forth swinging mode to form the needle pitch of the sewing machine of 5 MM.

Preferably, the cloth feeding motor drives the feeding shaft to swing within the range of 11.8 degrees in a repeated back-and-forth swinging mode, and the feed lifting tooth motor drives the feed lifting tooth shaft to swing within the range of 5 degrees in a repeated back-and-forth swinging mode to form the needle pitch of 5MM of the sewing machine.

Preferably, when the stitch length needs an unknown stitch length such as 9MM or 4MM, the unknown stitch length is X, the X stitch length can be calculated according to an arbitrary proportional relationship among 8MM, 7MM and 5MM, and the error of the X stitch length is controlled within a range of plus or minus 1 °.

Compared with the prior art, the beneficial effects of this application are: through utilizing the feed lifting motor to drive the feed lifting shaft in a mode of repeatedly swinging back and forth, and through utilizing the feed conveying motor to drive the step conveying shaft in a mode of repeatedly swinging back and forth, the needle pitch of the sewing machine can be randomly adjusted in a control system, the defect that the original sewing machine generally only has one specific needle pitch is overcome, the automatic adjustment needle pitch of the sewing machine is realized, one machine is realized to have a plurality of needle pitches, and the feed lifting machine has higher popularization and use values.

Drawings

FIG. 1 is a schematic view showing a feed motor and a feed motor of a sewing machine;

FIG. 2 is a schematic view showing a lower thread driving mechanism, an upper thread driving mechanism and a rotating shuttle driving assembly of a feed motor and a feed motor of a sewing machine;

FIG. 3 is a schematic view showing a feed driving assembly of a feed motor and a feed motor of a sewing machine;

FIG. 4 is a schematic view showing a thread cutting and presser foot lifting driving mechanism of a feed motor and a feed motor of a sewing machine;

FIG. 5 is another schematic view of a thread cutting and presser foot lifting drive mechanism for a feed motor and a feed motor of a sewing machine;

FIG. 6 is a schematic view showing the swing angles of the feed shaft and feed shaft of the feed motor and feed motor of the sewing machine;

FIG. 7 is a view showing a structure of feed dog and needle plate of a feed dog motor and a feed motor of a sewing machine.

Marking: the cloth feeding device comprises a tooth lifting motor 11, a tooth lifting shaft 111, a tooth lifting fork-shaped crank 112, a cloth feeding motor 21, a cloth feeding shaft 211, a tooth frame base 212, a tooth frame 213, a movable shaft 2131, a cloth feeding tooth 214, a rotating shuttle motor 31, a lower shaft 311, a rotating shuttle 312, an upper shaft motor 41, an upper shaft 411, a transmission part 412, a front and back cloth feeding stroke 2141, a tooth tip highest point 2142, a needle rod 413, a fan 414, a hand wheel 415, a connecting rod 416, a needle plate 51, an upper plane 511, a thread cutting and presser foot lifting motor 61, a thread cutting crank 71, a pushing part 711, a thread cutting fork wheel 72, a thread cutting rod 721, a return rod 722, a thread cutting execution end 73, a presser foot lifting cam 74, a presser foot lifting cam lifting surface 741, an idle circular arc surface 742, a presser foot lifting push rod 75, a presser foot execution end 76, a base plate 81 and a reciprocating swing rotation angle 91.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 7, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

The application provides a feed lifting motor and a cloth feeding motor of a sewing machine, and the sewing machine is provided with a bottom thread driving mechanism, an upper thread driving mechanism, a thread cutting and presser foot lifting driving mechanism and a control system. The bottom thread driving mechanism is provided with a cloth feeding driving component and a rotating shuttle driving component, wherein the cloth feeding driving component mainly comprises a feed lifting motor 11, a cloth feeding motor 21, a feed lifting shaft 111, a cloth feeding shaft 211, a cloth feeding tooth 214 and the like; the rotary shuttle driving assembly has a rotary shuttle motor 31, a lower shaft 311, and a rotary shuttle 312. The cloth feeding driving component drives the feed lifting shaft 111 by the feed lifting motor 11, and the cloth feeding motor 21 is connected with and drives the cloth feeding shaft 211 to indirectly realize the cloth feeding action of the cloth feeding teeth 214; the rotating shuttle motor 31 is connected with and drives the lower shaft 311 to realize that the rotating shuttle 312 connected with the lower shaft 311 executes the wire take-up and wire hooking actions, and the cloth feeding action of the cloth feeding teeth 214 and the wire take-up and wire hooking actions of the rotating shuttle 312 jointly realize the bottom wire outlet function of the bottom wire driving mechanism of the sewing machine. The needle threading driving mechanism is provided with an upper shaft motor 41, an upper shaft 411, a transmission piece 412 and a needle rod 413, wherein the upper shaft motor 41 is connected with and drives the upper shaft 411 to realize the needle threading action of the needle threading driving mechanism with the thread. The cloth feeding driving assembly, the rotating shuttle driving assembly and the upper thread driving mechanism realize normal sewing work of the sewing machine under the control of a control system of the sewing machine, the design that a main shaft motor transmits power to a lower shaft through a vertical shaft in the traditional driving mechanism is broken through, and the four motors drive the cam, the cloth feeding connecting rod, the tooth lifting connecting rod and the swinging seat of the upper shaft together to realize oil-free work of the sewing machine. In addition, the upper structure and the lower structure of the sewing machine are driven separately, lubricating oil is not needed for lubrication, and the manufacturing cost can be greatly reduced without matching the cam of the upper shaft, the vertical shaft and the taper gear set between the lower shafts.

The feed lifting motor 11 and the feed conveying motor 21 are fixedly installed below the base plate 81 and positioned at two sides of the base plate 81, and the rotary shuttle motor 31 is fixedly installed between the feed lifting motor 11 and the feed conveying motor 21. The feed lifting motor 11, the cloth feeding motor 21 and the rotary hook motor 31 are installed near the side of the rotary hook 312 of the sewing machine.

The lower thread driving mechanism is mainly embodied in that the feed dog 214 is fed by the feed dog shaft 211 driven by the feed dog motor 21 and the feed dog shaft 111 driven by the feed dog motor 11. The feed drive assembly also has a rack mount 212, a rack 213, feed dogs 214 and a feed dog fork crank 112. The feed lifting shaft 111 is directly connected to the output shaft of the feed lifting motor 11, or the feed lifting shaft 111 and the output shaft of the feed lifting motor 11 may be integrated, and a feed lifting fork-shaped crank 112 is mounted at the front end of the feed lifting shaft 111. The movable shaft 2131 of the gripper 213 is fitted inside the feed fork crank 112, and the feed fork crank 112 transmits the vertical feed operation to the gripper 213 by being driven by the feed motor 11 in a reciprocating swing operation, so that the feed dog 214 performs the vertical feed operation.

The cloth feeding shaft 211 is directly connected to an output shaft of the cloth feeding motor 21, or the cloth feeding shaft 211 may be integrated with the output shaft of the cloth feeding motor 21. A feed dog holder 212 is attached to the front end of the feed shaft 211, a feed dog 213 is connected to the feed dog holder 212, a feed dog 214 is fixed to the feed dog 213, and the feed dog holder 212 and the feed dog 213 transmit a forward and backward feed operation to the feed dog 213 by being driven by the feed motor 21 in a reciprocating operation manner, so that the feed dog 214 performs the forward and backward feed operation.

The feed dog motor 11 causes the feed dog 214 to move forward and backward and the feed dog motor 21 causes the feed dog 214 to move up and down, so that the feed dog 214 performs a feed function when sewing by the sewing machine.

A cloth feeding tooth positioning method of a sewing machine is arranged before the sewing machine leaves a factory: the zero starting positions of the feed motor 21 and the feed lifting motor 11 are positioned, and the front and rear feed center positions and the up and down feed positions of the feed dog 214 are positioned. Firstly, the tooth lifting motor 11 and the cloth feeding motor 21 locate the zero starting position under the control of the control system, the control system determines the zero starting position, specifically, the grating of the tooth lifting motor 11 and the cloth feeding motor 21 judges the position, and the grating of the tooth lifting motor 11 and the cloth feeding motor 21 determines the driving starting position as the zero starting position. Then, the tooth frame base 212 is sleeved on the cloth feeding shaft 211, the tooth lifting fork-shaped crank 112 is sleeved on the tooth lifting shaft 111, so that the tooth frame 213 and the cloth feeding tooth 214 are in a free movable state, the cloth feeding tooth 214 is moved to the central position of the front and rear cloth feeding stroke 2141 in the needle plate 51, at this time, the tooth frame base 212 is fixedly fixed on the cloth feeding shaft 211, the zero starting position positioning of the cloth feeding motor 21 is completed, and the zero starting position of the cloth feeding motor 21 is positioned by the front and rear cloth feeding central position of the cloth feeding tooth 214. Finally, the tooth apex peak 2142 of the feed dog 214 is moved to a position flush with the upper plane 511 of the needle plate 51, at this time, the feed dog fork-shaped crank 112 is fixed to the feed dog motor 11, the zero-point starting position of the feed dog motor 11 is positioned, and the zero-point starting position of the feed dog motor 11 is positioned by the upper and lower feed positions of the feed dog 214. The zero start positions of the positioning feed motor 21 and the feed lifting motor 11 are positioned, and the front and rear feed center positions and the up and down feed positions of the feed dog 214 are also positioned. In the positioning zero starting position positioning of the positioning cloth feeding motor 21 and the tooth lifting motor 11, the positioning cloth feeding motor 21 and the tooth lifting motor 11 are not in sequence, and the technical effects are the same no matter the positioning cloth feeding motor 21 or the tooth lifting motor 11 performs positioning first.

The front and rear feed strokes 2141 refer to the maximum stroke of the feed dog 21 in the needle plate 51, and the central position of the feed dog 214 refers to the central position of the stroke. The peak 2142 of the feed dog 214 is moved to a position flush with the upper plane 511 of the needle plate 51, and the needle point of the sewing machine needle may be flush with the peak 2142 of the tooth tip and the upper plane 511 to form a straight line.

After the zero starting positions of the cloth feeding motor 21 and the tooth lifting motor 11 are located, the cloth feeding motor 21 and the tooth lifting motor 11 execute sewing work under the control of the control system, that is, the tooth lifting motor 11 drives the tooth rack 213 to transmit up-and-down cloth feeding actions in a repeated swinging-back operation mode, the cloth feeding motor 21 drives the tooth rack 213 to transmit front-and-back cloth feeding actions in a repeated swinging-back operation mode, so that the cloth feeding tooth 214 has cloth feeding actions, and in combination with fig. 6, the repeated swinging-back operation angle 91 in the figure refers to a repeated swinging-back operation angle, and it needs to be pointed out that the direction displayed by the repeated swinging-back operation angle 91 does not represent the actual operation angle of the cloth feeding motor 21 and the tooth lifting motor 11.

Under the sewing machine with the needle pitch of 8MM, the cloth feeding motor 21 drives the step feeding shaft 111 to swing within the range of 24.5 degrees in a repeated back-and-forth swinging operation mode, and meanwhile, the feed lifting tooth motor 11 drives the feed lifting tooth shaft 211 to swing within the range of 9 degrees in the repeated back-and-forth swinging operation mode, so that the sewing machine can carry out sewing work with the needle pitch of 8 MM. Due to various factors, the operating angles of the sewing machine may have difference of operating accuracy, and further, at the needle pitch setting of 8MM, the cloth feeding motor 21 drives the feed shaft 111 to swing within the range of 22.5 ° in a repeated back-and-forth swing operating manner, and simultaneously, the feed motor 11 drives the feed lifting teeth shaft 211 to swing within the range of 7 ° in a repeated back-and-forth swing operating manner. Further, at a pitch of 8MM, the feed motor 21 drives the feed shaft 111 to swing within a range of 20.5 ° in a reciprocating operation, and the feed motor 11 drives the feed shaft 211 to swing within a range of 5 ° in a reciprocating operation.

In another scenario, the sewing machine is operated at a stitch pitch of 7MM, the cloth feeding motor 21 drives the step feeding shaft 111 to swing within a range of 22.7 degrees in a repeated reciprocating manner, and meanwhile, the feed lifting teeth motor 11 drives the feed lifting teeth shaft 211 to swing within a range of 9 degrees in a repeated reciprocating manner, so that the sewing machine can be operated at a stitch pitch of 7MM to perform sewing work. Due to various factors, the operating angles of the sewing machine may have difference of operating accuracy, and further, at the needle pitch of 7MM, the cloth feeding motor 21 drives the feed shaft 111 to swing within the range of 20.7 ° in a repeated back-and-forth swing operating manner, and simultaneously, the feed motor 11 drives the feed lifting teeth shaft 211 to swing within the range of 7 ° in a repeated back-and-forth swing operating manner. Further, at a pitch of 7MM, the feed motor 21 drives the feed shaft 111 to swing within a range of 18.7 ° in a reciprocating operation, and at the same time, the feed motor 11 drives the feed shaft 211 to swing within a range of 5 ° in a reciprocating operation.

In another scenario, the sewing machine is operated at a stitch pitch of 5MM, the cloth feeding motor 21 drives the step feeding shaft 111 to swing within a range of 15.8 degrees in a repeated reciprocating manner, and meanwhile, the feed lifting tooth motor 11 drives the feed lifting tooth shaft 211 to swing within a range of 9 degrees in a repeated reciprocating manner, so that the sewing machine is operated at a stitch pitch of 5MM to perform sewing work. Due to various factors, the operating angles of the sewing machine may have difference of operating accuracy, and further, at the needle pitch setting of 5MM, the cloth feeding motor 21 drives the feed shaft 111 to swing within the range of 13.8 ° in the repeated back-and-forth swing operating mode, and simultaneously, the feed motor 11 drives the feed lifting teeth shaft 211 to swing within the range of 7 ° in the repeated back-and-forth swing operating mode. Further, at a needle pitch of 5MM, the feed motor 21 drives the feed shaft 111 to swing within a range of 11.8 ° in a reciprocating operation, and at the same time, the feed motor 11 drives the feed shaft 211 to swing within a range of 5 ° in a reciprocating operation.

Of course, the present application is not limited to the above three pitches 8MM, 7MM and 5MM, and when a larger or smaller pitch is required, the corresponding pitch swing angle may be calculated based on the ratio of the pitch 8MM to the pitch 7MM, or the corresponding pitch swing angle may be calculated based on the ratio of the pitch 7MM to the pitch 5MM, for example, when the pitch requires an unknown pitch such as 9MM or 4MM, the unknown pitch is set to X, the pitch X may be calculated based on an arbitrary proportional relationship among the three of 8MM, 7MM and 5MM, and the error of the pitch X is controlled within a range of plus or minus 1 °. In conclusion, the needle pitch of the sewing machine can be adjusted at will in the control system, the defect that the original sewing machine only has one specific needle pitch is overcome, the automatic needle pitch adjustment of the needle pitch of the sewing machine is realized, a machine with multiple needle pitches is realized, and the popularization and use values are high.

The rotating shuttle motor 31 drives the lower shaft 311 to rotate in a rotating manner, and the rotating lower shaft 311 drives the rotating shuttle 312 to rotate to perform a wire take-up and hooking action. The cloth feeding action of the cloth feeding dog 214 and the wire take-up and hooking action of the rotating shuttle 312 jointly realize a bottom thread driving mechanism of the sewing machine.

The upper shaft motor 41 of the upper shaft driving mechanism drives the upper shaft 411 to rotate in a rotating mode, the rotating operation is changed into the transmission part 412 of the needle rod 413 which moves up and down through the installation of the upper shaft 411, the tape thread cloth threading action of the needle rod 413 passing through the needle plate 51 is realized, the upper shaft 411 is not provided with a cam, the design concept of the traditional sewing machine is broken, the technical scheme of a cloth feeding connecting rod and a tooth lifting connecting rod which are connected and driven by the cam is eliminated, the manufacturing cost of the sewing machine is reduced, and meanwhile, the sewing machine without a lubricating system is provided. The upper shaft motor 41 is installed on one side or the middle or the rear part of the upper shaft 411 close to the needle bar 413, the rear part of the upper shaft motor 41 is also provided with a fan 414, the fan 414 is used for accelerating the air convection of the inner space of the sewing machine, the rear part of the upper shaft motor 41 is also connected with a connecting rod 416, the tail end of the connecting rod 416 is fixedly connected with a hand wheel 415 for adjusting the position of the needle bar 413, the upper shaft 411 and the connecting rod 416 run synchronously along with the driving of the upper shaft motor 41, the diameter of the connecting rod 416 is smaller than that of the upper shaft 411, and the diameter of the connecting rod 416 is relatively smaller. Here, no cam is provided on the upper shaft 411 on which the upper shaft motor 41 is mounted, and it is within the scope of the present application to claim whether the upper shaft motor 41 is mounted on the side of the upper shaft 411 near the needle shaft 413 or in the middle or rear position.

The sewing machine breaks through the technical scheme of the traditional sewing machine, eliminates a cloth feeding connecting rod and a tooth lifting connecting rod of the traditional sewing machine and a taper gear set between a cam, a vertical shaft and a vertical shaft on a main shaft and a lower shaft, and can simultaneously shorten the manufacturing time of the cloth feeding shaft 211 and the tooth lifting shaft 111 (actually the tooth lifting shaft and the cloth feeding shaft in the existing sewing machine) so as to reduce the manufacturing cost, so that the tooth lifting amplitude of the cloth feeding tooth 214 is also controlled by a control system, the intelligent level of sewing is further improved, and the traditional part of the swinging seat is removed, and the swinging seat can completely have the functions. The feed lifting motor 11 and the feed feeding motor 21 are simultaneously started and stopped under the control of the control system to achieve the coordinated feed motion of the feed lifting driving mechanism and avoid the uncoordinated sewing motion of the feed lifting 214 or the feed lifting motion only without the feed conveying motion. Because the repeated swinging back and forth operation mode of the feed dog motor 11 and the feed cloth motor 21 is preset by the control system, the feed cloth action of the feed dog 214 is always in a constant stitch length for sewing, namely, the feed cloth and the feed dog are in a constant state, the condition that the size of the stitch length is deviated before and after the existing sewing machine technology is overcome, and the sewing quality and the stability of the sewing work are effectively improved.

The driving mechanism of the feed dog of the sewing machine is provided with a thread cutting and presser foot lifting driving mechanism, the thread cutting and presser foot lifting driving mechanism is provided with a thread cutting assembly and a presser foot lifting assembly, and the thread cutting assembly is provided with a thread cutting and presser foot lifting motor 61, a thread cutting crank 71, a thread cutting fork wheel 72 and a thread cutting execution end 73. Wherein the trimming crank 71 has a pushing member 711, and the pushing member 711 is arranged at the eccentric position of the trimming crank 71. The pushing piece 711 pushes the thread cutting fork wheel 72 to perform thread cutting action, the thread cutting fork wheel 72 is provided with a return rod 722 and a thread cutting rod 721, and the pushing piece 711 is positioned between the return rod 722 and the thread cutting rod 721. Under the driving of the thread cutting crank 71 by the thread cutting and presser foot lifting motor 61, the pushing member 711 pushes the thread cutting rod 721 to make the thread cutting execution end 73 execute thread cutting action.

The presser foot lifting assembly is provided with a thread trimming and lifting motor 61, a presser foot lifting cam 74, a presser foot lifting ejector rod 75 and a presser foot lifting execution end 76, the presser foot lifting cam 74 is provided with a presser foot lifting cam lifting surface 741 and an idle circular arc surface 742, the presser foot lifting cam 74 is fixed on an output shaft of the thread trimming and lifting motor 61, the presser foot lifting cam lifting surface 741 is used for adjusting the presser foot lifting ejector rod 75 to be at a lower position or a higher position to be at a higher position or a lower position, and the idle circular arc surface 742 is used for idle rotation between the presser foot lifting ejector rod 75 and the presser foot lifting cam 74. The idle circular arc surface 742 is concentric with the output shaft of the trimming and presser foot lifting motor 61, and the presser foot lifting cam elevation surface 741 is located at the cam portion of the presser foot lifting cam 74.

After the thread trimming operation is completed, the presser foot lifting cam 74 starts to perform the presser foot lifting operation, and the actual presser foot lifting operation of the presser foot lifting cam 74 is not generated by the rotation angle of the thread trimming and presser foot lifting motor 61 during the thread trimming operation on the presser foot lifting push rod 75, so that the presser foot lifting push rod 75 and the idle circular arc surface 742 idle. The trimming and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 of the presser foot lifting cam 74 to lift the presser foot lifting ejector rod 75, and when the presser foot lifting ejector rod 75 reaches the highest point, the presser foot lifting ejector rod 75 is lifted to the highest point, and the presser foot lifting execution end 76 completes the presser foot lifting action.

The thread trimming and presser foot lifting motor 61 drives the presser foot lifting cam 74 in a clockwise manner during thread trimming, the presser foot lifting cam 74 drives the presser foot lifting ejector rod 75 to gradually transit from the idle circular arc surface 742 to the presser foot lifting cam lifting surface 741 under the driving of the thread trimming and presser foot lifting motor 61 until the presser foot lifting highest point is reached, the presser foot lifting action is realized, at the moment, the thread trimming and presser foot lifting motor 61 is locked, so that the presser foot lifting state is maintained for a period of time, and the sewing action of immediately lifting the presser foot after thread trimming is formed.

In addition, in the presser foot lifting process, the pushing member 711 pushes the return rod 722, so that the pushing member 711 pushes the return rod 722 to the original position, the whole thread trimming assembly is reset, the thread trimming assembly can be effectively and directly returned to the original position under the fault state of clamping, and the resetting function is realized.

When the presser foot is to be lowered, the thread trimming and presser foot lifting motor 61 returns the presser foot lifting ejector rod 75 from the presser foot lifting cam lifting surface 741 to the idle circular arc surface 742, so that the presser foot lowering operation is realized.

There is another scenario where the presser foot is lifted without cutting the thread, and usually stitches are made under a large degree of bending. The thread cutting and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 to jack the presser foot lifting ejector rod 75 to the highest point of the presser foot, and when the presser foot is placed, the thread cutting and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 to return reversely to complete the action of placing the presser foot.

The above description is only one of the preferred embodiments of the present application, and not intended to limit the scope of the present application, and all modifications that can be made to the equivalent structure or equivalent flow path by using the shape, structure and principle of the present application and the accompanying drawings, or applied to other related fields directly or indirectly are included in the scope of the present application.

Claims (11)

1. A feed motor and a feed motor of a sewing machine are characterized in that the feed motor drives a feed shaft in a repeated back-and-forth swinging operation mode.

2. The feed motor and feed motor of a sewing machine as claimed in claim 1, wherein said feed motor drives the feed shaft to swing within 24.5 ° in a reciprocating manner, and wherein said feed motor drives the feed shaft to swing within 9 ° in a reciprocating manner to provide a stitch gauge of 8MM for the sewing machine.

3. The feed motor and feed motor of a sewing machine according to claim 1 or 2, wherein the feed motor drives the feed shaft to swing within 22.5 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within 7 ° in a reciprocating manner, thereby forming a stitch gauge of 8MM of the sewing machine.

4. The feed motor and feed motor of a sewing machine according to claim 1 or 2, wherein the feed motor drives the feed shaft to swing within a range of 20.5 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within a range of 5 ° in a reciprocating manner, thereby forming an 8MM pitch of the sewing machine.

5. The feed motor and feed motor of a sewing machine as claimed in claim 1, wherein said feed motor drives the feed shaft to swing within 22.7 ° in a reciprocating manner, and wherein said feed motor drives the feed shaft to swing within 9 ° in a reciprocating manner to provide a 7MM pitch of the sewing machine.

6. The feed motor and feed motor of a sewing machine as claimed in claim 1 or 5, wherein the feed motor drives the feed shaft to swing within a range of 20.7 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within a range of 7 ° in a reciprocating manner to form a 7MM pitch of the sewing machine.

7. The feed motor and feed motor of a sewing machine as claimed in claim 1 or 5, wherein the feed motor drives the feed shaft to swing within a range of 18.7 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within a range of 5 ° in a reciprocating manner to form a 7MM pitch of the sewing machine.

8. The feed motor and feed motor of a sewing machine as claimed in claim 1, wherein said feed motor drives the feed shaft to swing within 15.8 ° in a reciprocating manner, and wherein said feed motor drives the feed shaft to swing within 9 ° in a reciprocating manner to provide a sewing machine gauge of 5 MM.

9. The feed motor and feed motor of a sewing machine as claimed in claim 1 or 8, wherein the feed motor drives the feed shaft to swing within 13.8 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within 7 ° in a reciprocating manner to form a stitch gauge of 5MM of the sewing machine.

10. The feed motor and feed motor of a sewing machine as claimed in claim 1 or 8, wherein the feed motor drives the feed shaft to swing within 11.8 ° in a reciprocating manner, and the feed motor drives the feed shaft to swing within 5 ° in a reciprocating manner to form a needle pitch of 5MM of the sewing machine.

11. The feed motor and feed motor of sewing machine as claimed in claim 2, 5 or 8, wherein when the stitch length requires unknown stitch length such as 9MM or 4MM, the unknown stitch length is X, and the X stitch length can be calculated from any proportional relationship among 8MM, 7MM and 5MM, and the error of the X stitch length is controlled within plus or minus 1 °.

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