CN111501224B - Method for thread trimming, presser foot lifting and needle stitch sealing of sewing machine - Google Patents
Method for thread trimming, presser foot lifting and needle stitch sealing of sewing machine Download PDFInfo
- Publication number
- CN111501224B CN111501224B CN201910097856.8A CN201910097856A CN111501224B CN 111501224 B CN111501224 B CN 111501224B CN 201910097856 A CN201910097856 A CN 201910097856A CN 111501224 B CN111501224 B CN 111501224B
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- presser foot
- sewing
- trimming
- needle
- lifting
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/10—Needle bars for multiple-needle sewing machines
- D05B55/12—Needle bars for multiple-needle sewing machines with provision for varying the distance between the needles
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/14—Needle-bar drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
Abstract
The invention relates to the technical field of sewing machines, in particular to a method for sewing a thread-cutting presser foot-lifting closed stitch of a sewing machine, which mainly comprises a power part driving a thread-cutting cam, a presser foot-lifting crank and a closed stitch cam to rotate, wherein in the sewing process, the closed stitch cam drives a needle pitch adjusting mechanism to execute a needle pitch adjusting action, the needle pitch is adjusted to and kept at the set closed stitch needle pitch, and the number of closed stitch needles arranged in the sewing process under the set closed stitch needle pitch is used for finishing the closed stitch operation; after the dense needle sewing is finished or under the condition that the dense needle sewing operation is not carried out, the thread trimming cam drives the thread trimming mechanism to carry out thread trimming action; the presser foot lifting crank can drive the presser foot lifting mechanism to execute the presser foot lifting action. The three functions of thread cutting, presser foot lifting and needle sealing sewing are realized by one power part, the structure can be greatly simplified, more than 50% of space of a bottom plate of the sewing machine can be vacated, and the sewing machine has the advantages of simple and compact structure, high transmission efficiency and good stability.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a method for thread trimming, pressure lifting and pin sealing of a sewing machine.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a fabric, thereby interweaving or stitching one or more layers of material. The sewing machine is generally composed of four parts, namely a feeding device, a base, a transmission and an accessory, and sewing materials are sewn through reasonable cooperation and circular work of the motion of each mechanism.
At present, the sewing machine can use the functions of automatic thread trimming, automatic presser foot lifting and needle sealing sewing in the sewing process. The common mode is that three electromagnets with different powers are used for respectively driving a thread trimming mechanism, a presser foot lifting mechanism and a needle pitch adjusting mechanism to act, so that the functions of automatic thread trimming, automatic presser foot lifting and needle stitch sealing are realized. The driving mode has the advantages of complex mechanical structure, low transmission efficiency and large occupied space of the sewing machine, in addition, the electromagnet is started hard, larger noise and vibration can be generated inevitably, and accessories (such as a cowhells pad of the presser foot lifting electromagnet) of the electromagnet bear larger impact, so the durability is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for thread trimming, pressure raising and needle pressing for close stitch of a sewing machine with high transmission efficiency, so as to overcome the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for sewing thread trimming and presser foot lifting dense stitch of a sewing machine drives a thread trimming cam, a presser foot lifting crank and a dense stitch cam to rotate through a power part, and in the sewing process: when the dense needle sewing is needed, the rotating shaft of the power part rotates anticlockwise from the original point to enter a dense needle sewing interval and drives the dense needle sewing cam to rotate clockwise, the dense needle sewing cam drives the needle pitch adjusting mechanism to perform the needle pitch adjusting action, at the moment, the presser foot lifting mechanism and the thread cutting mechanism do not act, after the needle pitch is adjusted to the set dense needle sewing needle pitch, the rotating shaft of the power part is kept at a position corresponding to the set dense needle sewing needle pitch until the number of sewing needles under the set dense needle sewing needle pitch reaches the set dense needle sewing number, and the dense needle sewing operation is completed; when thread cutting is needed, the rotating shaft of the power part rotates anticlockwise from a position corresponding to the set stitch pitch of the dense needle or from an original point to enter a thread cutting interval, the thread cutting cam is driven to rotate anticlockwise, the thread cutting mechanism is driven to execute thread cutting action through the thread cutting cam, the stitch pitch adjusting mechanism is driven by the stitch pitch of the dense needle to keep a fixed stitch pitch value in the thread cutting process, and the presser foot lifting mechanism does not act; after the trimming is finished, the rotating shaft of the power part reversely and clockwise rotates to return to the original point; when the presser foot needs to be lifted, the rotating shaft of the power part rotates clockwise from the original point to enter a presser foot lifting interval, the presser foot lifting crank is driven to rotate anticlockwise, the presser foot lifting mechanism is driven to perform the action of lifting the presser foot through the presser foot lifting crank, and at the moment, the thread trimming mechanism and the needle pitch adjusting mechanism do not act; after the pressure foot lifting action is finished, the rotating shaft of the power part rotates anticlockwise in the opposite direction to return to the original point.
Preferably, when seam lifting and slight lifting are needed, before sewing is started, the rotating shaft of the power part rotates clockwise from the original point to enter a seam lifting and slight lifting interval in the presser foot lifting interval, the presser foot lifting crank is driven to rotate anticlockwise, and the presser foot lifting mechanism is driven to perform presser foot lifting action through the presser foot lifting crank; after the sewing is started and the sewing is completed, the rotating shaft of the power member is reversely rotated counterclockwise to return to the original point.
Preferably, after the thread trimming is completed, when the rotating shaft of the power part rotates clockwise in the opposite direction to return to the original point, the thread trimming cam is driven to rotate clockwise to reset, and meanwhile, the thread trimming mechanism is driven to reset through a reset spring, or the thread trimming cam acts on the thread trimming driving crank to drive the thread trimming mechanism to reset.
Preferably, the power member is controlled by the controller to start or stop rotation, and the rotation direction and rotation angle of the rotation shaft of the power member are controlled.
Compared with the prior art, the invention has the remarkable progress that:
the invention relates to a method for sewing thread trimming and presser foot lifting for close stitch of a sewing machine, which is characterized in that a power part drives a thread trimming cam, a presser foot lifting crank and a close stitch cam to rotate, the thread trimming mechanism can be driven to execute thread trimming action by rotating the thread trimming cam, the presser foot lifting mechanism can be driven to execute presser foot lifting action by rotating the presser foot lifting crank, and the needle distance adjusting mechanism can be driven to execute needle distance adjusting action by rotating the close stitch cam, so that the close stitch function is realized, namely three functions of thread trimming, presser foot lifting and close stitch are realized by driving the power part, the structure can be greatly simplified, more than 50% of space of a bottom plate of the sewing machine can be vacated, and the structure is simple and compact, the transmission efficiency is high, and the stability is good.
Drawings
Fig. 1 is a schematic front view of the overall structure of a sewing machine according to an embodiment of the present invention.
Fig. 2 is a schematic bottom view of the overall structure of the sewing machine according to the embodiment of the present invention.
FIG. 3 is a schematic structural view of a thread trimming and pressure raising and sealing device of a sewing machine according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the thread trimming assembly, the thread trimming drive shaft, the thread trimming drive crank and the thread trimming cam in the embodiment of the invention.
FIG. 5 is a schematic structural diagram of the combination of the driving shaft for lifting and pressing the presser foot and the stitch-sealing stitch, the push rod for lifting and pressing the presser foot and the swing plate seat for adjusting the stitch length in the embodiment of the invention.
Fig. 6 is a schematic structural diagram of the needle pitch adjusting swing plate seat in the embodiment of the invention.
FIG. 7 is a schematic view of the construction of a cam for closed stitch in an embodiment of the present invention.
Fig. 8 is a schematic diagram of the division of the working interval of one rotation of the power member in the embodiment of the invention.
FIG. 9 is a schematic view showing the operation of the thread trimming and presser foot sealing device of the sewing machine according to the embodiment of the present invention.
Wherein the reference numerals are as follows:
1. bottom plate 2, power part
20. Rotating shaft 21 and bracket
3. Trimming cam 31, trimming contour surface
311. Cut line section 312, forced reset section
4. Trimming driving crank 41 and trimming ball
42. Forced reset part 40 and wire cutting drive shaft
401. Trimming crank 402 and trimming connecting rod
403. Moving knife rest 404 and moving knife
405. Stationary knife 5, lift presser foot and seal stitch driving shaft
51. Shaft sleeve 50 and transmission assembly
501. Driving gear 502, driven gear
6. Crank 7 for lifting presser foot and cam for sealing stitch
71. Dense needle sewing contour surface 711 and base circle segment
712. Needle pitch adjusting section 713, needle pitch maintaining section
8. Lift presser foot ejector pin 9, adjust needle pitch swing plate seat
90. Support shaft 91, pin
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 9, an embodiment of the present invention provides a thread trimming and presser foot sealing device for a sewing machine. The thread trimming, presser foot lifting and needle sealing device of the sewing machine is arranged in the sewing machine and used for realizing the thread trimming function, the presser foot lifting function and the needle sealing function of the sewing machine. For convenience of description, the moving direction of the cloth when the sewing machine sews is defined as a forward direction, and a direction perpendicular to the moving direction of the cloth on a horizontal plane is a left-right direction, and a side close to the head is a left side and a side close to the tail is a right side.
Referring to fig. 1, the sewing machine has a base plate 1, and the thread cutting, presser foot lifting and needle sealing sewing device of the sewing machine of the embodiment is mounted on the base plate 1.
Referring to fig. 2 and 3, the thread cutting, presser foot lifting and needle sealing sewing device of the sewing machine of the embodiment comprises a power member 2, a thread cutting cam 3, a thread cutting driving crank 4, a presser foot lifting and needle sealing sewing driving shaft 5, a transmission assembly 50, a presser foot lifting crank 6 and a needle sealing sewing cam 7.
Wherein, the power member 2 is fixedly supported on the bottom plate 1 of the sewing machine through a bracket 21, and the power member 2 is provided with a rotating shaft 20. The trimming cam 3 is fixedly arranged on the rotating shaft 20 of the power part 2, and the trimming cam 3 is driven to synchronously rotate along with the rotation of the rotating shaft 20 of the power part 2. The rotating shaft 20 of the power member 2 is connected with the presser foot lifting and sealing stitch driving shaft 5 through the transmission assembly 50 and drives the presser foot lifting and sealing stitch driving shaft 5 to rotate, namely, the transmission assembly 50 transmits the rotation of the rotating shaft 20 of the power member 2 to the presser foot lifting and sealing stitch driving shaft 5. Preferably, the power part 2 is a dual output shaft motor, both sides of the dual output shaft motor are provided with rotating shafts 20, the trimming cam 3 and the transmission assembly 50 are respectively installed on the rotating shafts 20 on both sides of the dual output shaft motor, in this embodiment, the trimming cam 3 is installed on the rotating shaft 20 on the left side of the dual output shaft motor, and the transmission assembly 50 is installed on the rotating shaft 20 on the right side of the dual output shaft motor.
Referring to fig. 3 and 4, the trimming cam 3 has a trimming contour surface 31 on the outer periphery thereof, the trimming driving crank 4 is connected to the trimming mechanism, and the trimming driving crank 4 is provided with a trimming ball 41, and the trimming ball 41 is located on the outer peripheral side of the trimming cam 3. When the power member 2 drives the trimming cam 3 to rotate, the trimming contour surface 31 of the trimming cam 3 rotates along with the axis of the rotating shaft 20 of the power member 2, and during the rotation, the trimming contour surface 31 is separated from or in contact with the trimming ball 41. When the trimming contour surface 31 is in contact fit with the trimming ball 41, the trimming driving crank 4 can be driven to rotate by the action of the trimming contour surface 31 on the trimming ball 41, and the rotation of the trimming driving crank 4 drives the trimming mechanism to move so as to execute trimming action. When the trimming contour surface 31 is separated from the trimming ball 41, the trimming driving crank 4 and the trimming mechanism execute an idle stroke, and the trimming operation is not performed. The trimming ball 41 may be fixedly mounted on the trimming driving crank 4, or may be rollably mounted on the trimming driving crank 4, in this embodiment, preferably, the trimming ball 41 is rollably mounted on the trimming driving crank 4, so as to reduce the friction between the trimming ball 41 and the trimming contour surface 31 of the trimming cam 3 when they are in contact fit with each other. Preferably, the shear ball 41 may be mounted axially on the shear drive crank 4 by a shaft screw.
Referring to fig. 3 and 4, in the present embodiment, the thread cutting mechanism preferably includes a thread cutting drive shaft 40, the thread cutting drive shaft 40 is rotatably supported on the base plate 1, and the thread cutting drive shaft 40 is disposed in parallel with the rotation shaft 20 of the power member 2. The left end of the thread cutting driving shaft 40 is connected with the thread cutting assembly, the thread cutting driving crank 4 is fixedly arranged at the right end of the thread cutting driving shaft 40, the thread cutting driving shaft 40 is driven to rotate along with the rotation of the thread cutting driving crank 4, and the thread cutting assembly is driven to move by the rotation of the thread cutting driving shaft 40 to execute thread cutting action. Preferably, the thread trimming assembly comprises a thread trimming crank 401 and a thread trimming connecting rod 402, one end of the thread trimming crank 401 is fixedly arranged at the left end of the thread trimming driving shaft 40, the other end of the thread trimming crank 401 is hinged with one end of the thread trimming connecting rod 402, and the other end of the thread trimming connecting rod 402 is connected with the movable cutter assembly. When the thread cutting driving shaft 40 rotates, the thread cutting crank 401 rotates along with the thread cutting driving shaft, and drives the thread cutting connecting rod 402 to move, and the thread cutting connecting rod 402 drives the movable cutter assembly to move, so that thread cutting is performed. The trimming crank 401 is directly connected with the movable cutter component through the trimming connecting rod 402, so that the structure is greatly simplified. The movable cutter component can be a structure capable of realizing thread trimming in the prior art, and the movable cutter component can be suitable for the movable cutter components with various structural forms and has the advantage of wide application range. For example, the movable knife assembly may include a movable knife rest 403 and a movable knife 404, the movable knife 404 is mounted on the movable knife rest 403, a fixed knife 405 is fixedly mounted on the base plate 1, and the other end of the thread trimming connecting rod 402 is hinged to the movable knife rest 403, so that when the thread trimming driving shaft 40 rotates, the movable knife 404 is driven to move relative to the fixed knife 405 through the transmission of the thread trimming crank 401 and the thread trimming connecting rod 402, and thread trimming is performed. Of course, the structure of the moving blade assembly is not limited to the single-moving blade structure, and a double-moving blade structure may be adopted.
Referring to fig. 4, in the present embodiment, the trimming drive crank 4 is further provided with a forcible returning portion 42, and the forcible returning portion 42 and the trimming balls 41 are provided at intervals in the circumferential direction of the trimming drive shaft 40. The trimming contour surface 31 has a trimming segment 311 and a forced resetting segment 312, the trimming segment 311 is used for contacting and matching with the trimming ball 41 on the trimming drive crank 4, and the forced resetting segment 312 is used for contacting and matching with the forced resetting part 42 on the trimming drive crank 4. The distance between the trimming section 311 and the rotation center of the trimming cam 3 gradually increases, the tail end of the trimming section 311 is the highest point of the trimming section 311 which is farthest from the rotation center of the trimming cam 3, the forced reset section 312 is connected with the tail end of the trimming section 311, and the forced reset section 312 protrudes to the outside of the trimming cam 3. In the initial state, the thread trimming cam 3 is not in contact with the thread trimming drive crank 4, and the thread trimming drive crank 4, the thread trimming drive shaft 40, and the thread trimming assembly are not operated. When the trimming cam 3 is driven by the power element 2 to rotate until the trimming segment 311 of the trimming contour surface 31 is in contact fit with the trimming ball 41 on the trimming driving crank 4, the trimming driving crank 4 is driven by the trimming segment 311 to drive the trimming driving shaft 40 to rotate, so that the trimming assembly performs a trimming operation, in the process, the trimming cam 3 and the trimming driving crank 4 rotate in opposite directions, the forced resetting section 312 of the trimming contour surface 31 gradually enters a space between the trimming ball 41 of the trimming driving crank 4 and the forced resetting section 42, and when the trimming operation is completed, the forced resetting section 42 is located on the outer periphery of the trimming contour surface 31 and is adjacent to the forced resetting section 312. Then, the power element 2 can drive the trimming cam 3 to rotate reversely to reset, and under normal conditions, while the trimming cam 3 rotates reversely to reset, the trimming driving shaft 40 and the trimming driving crank 4 can move reversely to reset under the action of the trimming mechanism reset spring, which is the prior art and will not be described herein, at this time, the forced reset section 312 of the trimming contour surface 31 and the forced reset portion 42 of the trimming driving crank 4 rotate reversely at the same time, and the two are not in contact with each other. However, when a fault such as a knife jam occurs, the wire cutting mechanism return spring cannot drive the wire cutting drive shaft 40 and the wire cutting drive crank 4 to normally return, at this time, the wire cutting drive crank 4 is not moved, the wire cutting cam 3 rotates reversely, the forced return section 312 of the wire cutting profile surface 31 contacts and impacts the forced return section 42 of the wire cutting drive crank 4, and the wire cutting drive crank 4 can rotate reversely under the action of the forced return section 312 to drive the wire cutting drive shaft 40 and the wire cutting assembly to reversely move and return. Therefore, the thread trimming component can be ensured to be reset smoothly after the thread trimming action is executed.
Referring to fig. 3 and 5, the pressure raising/pressing sewing drive shaft 5 is rotatably supported on the base plate 1, and in the present embodiment, the left end of the pressure raising/pressing sewing drive shaft 5 is rotatably supported on a shaft sleeve 51, the shaft sleeve 51 is fixedly supported on the base plate 1, and the right end of the pressure raising/pressing sewing drive shaft 5 is rotatably supported on the base plate 1. The presser foot lifting and pressing sealing stitch driving shaft 5 is arranged in parallel with the rotating shaft 20 of the power piece 2, the left end of the presser foot lifting and pressing sealing stitch driving shaft 5 is connected with the transmission assembly 50, and when the rotating shaft 20 of the power piece 2 rotates, the presser foot lifting and pressing sealing stitch driving shaft 5 is driven to rotate along with the rotation through the transmission of the transmission assembly 50. Preferably, the transmission assembly 50 may include a driving gear 501 and a driven gear 502, the driving gear 501 is fixed on the rotating shaft 20 of the power member 2, the driven gear 502 is fixed on the presser foot stitch lifting driving shaft 5, the driving gear 501 and the driven gear 502 are engaged, when the rotating shaft 20 of the power member 2 rotates, the driving gear 501 rotates synchronously with it and drives the driven gear 502 to rotate reversely, and the presser foot stitch lifting driving shaft 5 rotates synchronously with the driven gear 502. Preferably, the driven gear 502 can be a sector gear, which can save space.
Referring to fig. 5, the presser foot lifting crank 6 is fixedly arranged in the middle of the presser foot lifting stitch closing drive shaft 5, and the presser foot lifting crank 6 can be in contact fit with the presser foot lifting mechanism and drive the presser foot lifting mechanism to perform the presser foot lifting action. Preferably, the presser foot lifting mechanism comprises a presser foot lifting ejector rod 8, the presser foot lifting ejector rod 8 is positioned above the presser foot lifting crank 6, the bottom end of the presser foot lifting ejector rod 8 is arranged opposite to the presser foot lifting crank 6, and the top end of the presser foot lifting ejector rod 8 is connected with the presser foot lifting assembly. When the power part 2 drives the presser foot lifting and pressing stitch sealing driving shaft 5 to rotate, the presser foot lifting crank 6 synchronously rotates along with the presser foot lifting and pressing stitch sealing driving shaft 5, when the presser foot lifting crank 6 rotates towards the direction close to the presser foot lifting ejector rod 8, the presser foot lifting crank 6 can be abutted against the bottom end of the presser foot lifting ejector rod 8 and pushes the presser foot lifting ejector rod 8 upwards to move, the movement of the presser foot lifting ejector rod 8 drives the presser foot lifting assembly to move, and the presser foot lifting action is executed. The presser foot lifting component can be a structure capable of realizing the action of lifting the presser foot in the prior art. Preferably, a buffer pad can be arranged between the presser foot lifting crank 6 and the presser foot lifting ejector rod 8, so that the buffer function is achieved, and the vibration and noise in the presser foot lifting process can be reduced.
Referring to fig. 5, 6 and 7, the needle-sealing sewing cam 7 is fixedly arranged at the right end of the pressure raising and pressing needle-sealing sewing driving shaft 5, and the outer periphery of the needle-sealing sewing cam 7 is provided with a needle-sealing sewing profile surface 71. the needle-sealing sewing profile surface 71 can be in contact fit with the needle distance adjusting mechanism and drives the needle distance adjusting mechanism to perform the needle distance adjusting action. Preferably, the needle pitch adjusting mechanism comprises a needle pitch adjusting swing plate seat 9, the needle pitch adjusting swing plate seat 9 is rotatably supported on a support shaft 90, the needle pitch adjusting swing plate seat 9 is connected with the needle pitch adjusting assembly, the support shaft 90 is supported on the bottom plate 1, and the support shaft 90 is arranged in parallel with the rotating shaft 20 of the power member 2. Preferably, the left and right sides of the needle pitch adjusting swing plate seat 9 are respectively supported on a support shaft 90, and the two support shafts 90 are coaxially arranged. The pin 91 is arranged on the left side of the needle pitch adjusting swing plate seat 9, and the pin 91 is positioned on the outer periphery side of the closed stitch cam 7. When the power part 2 drives the presser foot lifting and pressing dense needle sewing driving shaft 5 to rotate, the dense needle sewing cam 7 synchronously rotates along with the presser foot lifting and dense needle sewing driving shaft 5, the dense needle sewing profile surface 71 rotates along with the axis of the presser foot lifting and dense needle sewing driving shaft 5, in the rotating process, the dense needle sewing profile surface 71 can be in contact fit with the pin 91, the pin 91 is driven by the dense needle sewing profile surface 71 to rotate around the axis of the supporting shaft 90, the needle distance adjusting swing plate seat 9 is driven by the rotation of the needle distance adjusting swing plate seat 9 to move, the needle distance adjusting action is executed, the needle distance is adjusted, and the dense needle sewing function can be realized. The stitch length adjusting component can be a structure capable of realizing the stitch length adjusting action in the prior art.
Referring to fig. 7, in the present embodiment, the closed stitch contour surface 71 of the closed stitch cam 7 has a base circle segment 711, a stitch length adjusting segment 712, and a stitch length maintaining segment 713 that are sequentially connected in the circumferential direction, the base circle segment 711 and the stitch length maintaining segment 713 are both circular arc segments that are concentrically arranged with the rotation center of the closed stitch cam 7, and the distance between the stitch length adjusting segment 712 and the rotation center of the closed stitch cam 7 gradually increases. In the initial state, the base circle segment 711 of the closed stitch contour surface 71 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, the base circle segment 711 drives the needle pitch adjusting swing plate seat 9 to execute an idle stroke, and the needle pitch adjusting assembly does not act. When the needle pitch adjusting section 712 of the needle-tight sewing cam 7 which is driven by the power part 2 to rotate to the needle pitch adjusting contour surface 71 is contacted and matched with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch adjusting section 712 can drive the needle pitch adjusting swing plate seat 9 to rotate, so that the needle pitch adjusting component moves to execute the needle pitch adjusting action, the needle pitch is adjusted to and maintained at the required needle pitch, the needle-tight sewing operation is carried out, and the control of the number of needle-tight sewing needles can be realized by controlling the maintaining time of the currently required needle pitch. After the dense needle sewing is finished, the power part 2 drives the dense needle sewing cam 7 to continuously rotate, so that the needle pitch keeping section 713 of the dense needle sewing contour surface 71 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch is kept at a fixed value at the moment, the thread cutting operation can be carried out, the needle pitch is kept at a fixed value through the needle pitch keeping section 713, and the feeding tooth can be prevented from swinging greatly in the thread cutting process.
In this embodiment, the rotation angle of the rotation shaft 20 of the power member 2 is controllable, and the rotation angles of the power member 2 driving the thread cutting cam 3, the presser foot lifting crank 6 and the stitch sealing cam 7 to rotate are controllable, preferably, the power member 2 may be a double-output-shaft stepping motor or a double-output-shaft servo motor, and can realize the accurate control of the rotation angles of the thread cutting cam 3, the presser foot lifting crank 6 and the stitch sealing cam 7. The accurate control of the lifting height of the presser foot can be realized by controlling the rotating angle of the presser foot lifting crank 6 by the power part 2, and the accurate adjustment of the needle pitch can be realized by controlling the rotating angle of the needle-sealing sewing cam 7 by the power part 2. Moreover, the double-output-shaft stepping motor or the double-output-shaft servo motor adopts a soft start mode, so that hard impact can be effectively avoided, and the effects of reducing vibration and noise are achieved.
In this embodiment, the power member 2 may be connected to a controller (not shown in the figure), and the controller controls the power member 2 to start or stop rotating according to the work requirement of the sewing machine, and controls the rotating direction and the rotating angle of the power member 2, so as to control the matching state between the trimming contour surface 31 on the trimming cam 3 and the trimming ball 41, the matching state between the presser foot lifting crank 6 and the presser foot lifting ejector rod 8, and the matching state between the closed stitch contour surface 71 on the closed stitch cam 7 and the pin 91 on the needle distance adjusting swing plate seat 9, to realize the precise control of the trimming, presser foot lifting and closed stitch actions, and to realize the control of the presser foot lifting height, the closed stitch distance and the needle number. The controller can be a main controller of the existing sewing machine, such as a PLC controller or a singlechip.
Referring to fig. 8, in the present embodiment, the rotating shaft 20 of the power element 2 is rotated counterclockwise by one turn and is divided into an AB segment, a BC segment, a CD segment, and a DA segment in this order, and herein, the rotating direction of the rotating shaft 20 of the power element 2 is based on the view from the front of the head of the sewing machine. Wherein A is the origin; the section AB is a closed stitch interval a and is used for driving the needle pitch adjusting swing plate seat 9 and the needle pitch adjusting assembly to execute needle pitch adjusting action, so that the needle pitch is adjusted to perform closed stitch operation; the BC section is a trimming section b and is used for driving the trimming driving crank 4, the trimming driving shaft 40 and the trimming assembly to execute trimming; the CD section is a non-working interval d; the DA section is a presser foot lifting interval c and is used for driving the presser foot lifting ejector rod 8 and the presser foot lifting assembly to execute the presser foot lifting action. In addition, the AE section is located in the DA section, the AE section is a seam lifting and slightly lifting interval E, when sewing is started, the rotating shaft 20 of the power part 2 can be rotated from the point A to the point E, the presser foot lifting crank 6 is driven to rotate by a small angle, the presser foot lifting crank 6 is driven to abut against the bottom end of the presser foot lifting ejector rod 8 and push the presser foot lifting ejector rod 8 to move upwards for a small distance, and the presser foot lifting assembly is driven to perform a small-amplitude presser foot lifting action, namely, the seam lifting and slightly lifting action is performed. Through the slight lifting of the seam, the acting force is transferred to the position of the presser foot by the presser foot lifting assembly, the pressure of the presser foot during the seam lifting can be controlled, the bad working condition of seam lifting and thread breaking caused by the dead pressing of the presser foot on the thread end is avoided, and the seam lifting and thread breaking rate is effectively reduced.
In this embodiment, the angle matching relationship between the trimming contour surface 31 of the trimming cam 3, the presser foot lifting crank 6 and the needle sealing contour surface 71 of the needle sealing cam 7, that is, the relative positions of the three are designed to satisfy: when the rotating shaft 20 of the power part 2 is positioned in the close stitch interval a, the needle pitch adjusting section 712 of the close stitch contour surface 71 of the close stitch cam 7 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch adjusting section 712 can drive the needle pitch adjusting swing plate seat 9 to rotate, so that the needle pitch adjusting assembly moves to execute the needle pitch adjusting action to obtain the required needle pitch for close stitch operation, at the moment, the thread trimming cam 3 is not in contact with the thread trimming driving crank 4, the thread trimming driving shaft 40 and the thread trimming assembly do not act, meanwhile, the pressure foot lifting crank 6 is not in contact with the pressure foot lifting ejector rod 8, and the pressure foot lifting assembly does not act; when the rotating shaft 20 of the power part 2 is positioned in the trimming interval b, the trimming section 311 of the trimming contour surface 31 of the trimming cam 3 is in contact fit with the trimming ball 41 on the trimming driving crank 4, the trimming driving crank 4 is driven by the trimming section 311 to drive the trimming driving shaft 40 to rotate, so that the trimming assembly performs trimming operation, at the moment, the stitch length keeping section 713 of the stitch closing contour surface 71 of the stitch closing cam 7 is in contact fit with the pin 91 on the stitch length adjusting swing plate seat 9, so that the stitch length is kept at a fixed value without interfering with the trimming operation, meanwhile, the presser foot lifting crank 6 is not in contact with the presser foot lifting ejector rod 8, and the presser foot lifting assembly is not operated; when the rotating shaft 20 of the power part 2 is located in the presser foot lifting interval c, the presser foot lifting crank 6 is abutted against the bottom end of the presser foot lifting ejector rod 8 and pushes the presser foot lifting ejector rod 8 upwards to move so as to drive the presser foot lifting assembly to move and execute the presser foot lifting action, at the moment, the base circle section 711 of the dense needle sewing profile surface 71 of the dense needle sewing cam 7 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch adjusting swing plate seat 9 executes an idle stroke, the needle pitch adjusting assembly does not act, meanwhile, the thread trimming cam 3 is not in contact with the thread trimming driving crank 4, and the thread trimming driving crank 4, the thread trimming driving shaft 40 and the thread trimming assembly do not act. Therefore, the purposes that the thread cutting action, the presser foot lifting action and the needle sealing sewing action do not interfere with each other are achieved.
The thread cutting, presser foot lifting and stitch sealing device of the sewing machine of the embodiment drives the thread cutting cam 3 and the transmission component 50 to synchronously rotate by the power component 2, drives the presser foot lifting and stitch sealing driving shaft 5 to rotate by the transmission component 50, drives the thread cutting driving crank 4 to drive the thread cutting driving shaft 40 and the thread cutting component to execute thread cutting action by the thread cutting contour surface 31 on the thread cutting cam 3, drives the presser foot lifting ejector rod 8 to drive the presser foot lifting component to execute the presser foot lifting action by the rotation of the presser foot lifting crank 6, drives the stitch distance adjusting swinging plate seat 9 to drive the stitch distance adjusting component to execute the stitch distance adjusting action by the stitch distance adjusting contour surface 71 on the stitch sealing cam 7, realizes the stitch sealing function, namely realizes three functions of thread cutting, presser foot and stitch sealing by the driving component 2, adopts a brand new transmission structure, greatly simplifies the structure, can vacate more than 50% of space of the sewing machine plate, the transmission mechanism has the advantages of simple and compact structure, high transmission efficiency and good stability.
Based on the above-mentioned sewing machine trimming lifts presser foot and close stitch device, this embodiment still provides a sewing machine, and the sewing machine of this embodiment includes the above-mentioned sewing machine trimming of this embodiment lifts presser foot and close stitch device.
The embodiment also provides a method for lifting the presser foot and the close stitch by trimming threads of the sewing machine, which can be realized by adopting the sewing machine of the device for lifting the presser foot and the close stitch by trimming threads of the sewing machine.
The method for thread trimming, presser foot lifting and needle sealing of the sewing machine in the embodiment comprises the following steps: the thread trimming cam 3, the presser foot lifting crank 6 and the needle sealing sewing cam 7 are driven to rotate by a power part 2, and in the sewing process:
when the dense needle sewing is needed, the rotating shaft 20 of the power part 2 rotates anticlockwise from the original point A to enter a dense needle sewing interval a and drives the dense needle sewing cam 7 to rotate clockwise, the needle pitch adjusting mechanism is driven to perform the needle pitch adjusting action through the dense needle sewing cam 7, at the moment, the presser foot lifting mechanism and the thread cutting mechanism do not act, after the needle pitch is adjusted to the set dense needle sewing needle pitch, the rotating shaft 20 of the power part 2 is kept at the position corresponding to the set dense needle sewing needle pitch until the number of sewing needles under the set dense needle sewing needle pitch reaches the set dense needle sewing number, and the dense needle sewing operation is completed.
When thread cutting is needed, the rotating shaft 20 of the power part 2 rotates anticlockwise from a position corresponding to the set stitch pitch of the closed stitch or from the original point A to enter a thread cutting interval b, and drives the thread cutting cam 3 to rotate anticlockwise, so that thread cutting can be performed after the closed stitch operation is completed, or thread cutting can be performed directly without the closed stitch operation. The thread trimming cam 3 drives the thread trimming mechanism to execute thread trimming action, and in the thread trimming process, the needle stitch adjusting mechanism is driven by the needle stitch sealing cam 7 to keep a fixed needle pitch value without interfering the thread trimming action, and the presser foot lifting mechanism does not act. After the thread cutting is finished, the rotating shaft 20 of the power part 2 reversely and clockwise rotates to return to the original point A, and meanwhile, the thread cutting mechanism is driven to reset through the reset spring. When faults such as knife clamping and the like occur and the reset spring cannot drive the trimming mechanism to reset, the trimming cam 3 acts on the trimming drive crank 4 to drive the trimming mechanism to reset.
When the presser foot needs to be lifted, the rotating shaft 20 of the power part 2 rotates clockwise from the original point A to enter a presser foot lifting interval c, the presser foot lifting crank 6 is driven to rotate anticlockwise, the presser foot lifting mechanism is driven to perform the presser foot lifting action through the presser foot lifting crank 6, and at the moment, the thread cutting mechanism and the needle pitch adjusting mechanism do not act; after the foot lifting action is completed, the rotating shaft 20 of the power member 2 rotates counterclockwise in the reverse direction back to the original point a.
Preferably, when the seam lifting is slightly lifted, before sewing is started, the rotating shaft 20 of the power part 2 rotates clockwise from the original point A into a seam lifting slightly-lifted interval e in the presser foot lifting interval c, the presser foot lifting crank 6 is driven to rotate anticlockwise, and the presser foot lifting mechanism is driven to perform the presser foot lifting action through the presser foot lifting crank 6 to slightly lift the seam; after the sewing is started and the sewing is completed, the rotating shaft 20 of the power member 2 is reversely rotated counterclockwise back to the origin a. Through seam lifting slightly, the acting force is transferred to the presser foot position by the presser foot lifting mechanism, the presser foot pressure during seam lifting can be controlled, the bad working condition of seam lifting and thread breaking caused by the dead pressing of the presser foot on the thread end is avoided, and the seam lifting and thread breaking rate is effectively reduced.
Preferably, the power member 2 is controlled by the controller to start or stop rotation, and the rotation direction and rotation angle of the rotation shaft 20 of the power member 2 are controlled. The functions of a seam lifting and slightly lifting switch and a closed stitch switch can be realized by a user according to the requirement, and the required height of the presser foot lifting, the seam lifting and slightly lifting height, the closed stitch pitch and the closed stitch number are set, so that the accurate control is realized, and the device has the advantages of convenience in operation, good stability and good applicability.
Referring to fig. 9, when the method for trimming, lifting, pressing and sealing the stitch of the sewing machine of the embodiment is implemented by using the sewing machine of the device for trimming, lifting, pressing and sealing the stitch of the sewing machine of the embodiment, the method specifically includes the following steps:
and step S1, starting the sewing machine and operating the controller.
And step S2, setting the pressure foot lifting height, the seam lifting slight lifting opening/closing signal, the seam lifting slight lifting height, the closed stitch opening/closing signal, the closed stitch pitch and the closed stitch number in the control program.
In step S3, the controller receives a start signal.
And step S4, judging whether the seam slightly lifts. If the seam lifting and slight lifting are needed, namely the controller receives a seam lifting and slight lifting opening signal, the controller controls the rotating shaft 20 of the power part 2 to rotate clockwise from the original point A to enter a seam lifting and slight lifting interval e in the seam lifting and pressing interval c according to the set seam lifting and slight lifting degree until the rotating shaft reaches a position corresponding to the set seam lifting and slight lifting degree, the transmission of the transmission assembly 50 drives the seam sealing and pressing driving shaft 5 of the seam lifting and pressing pin to rotate anticlockwise to drive the crank 6 of the seam lifting and pressing pin to rotate anticlockwise, so that the crank 6 of the seam lifting and pressing pin pushes the top rod 8 of the seam lifting and pressing pin to move, the motion of the top rod 8 of the seam lifting and pressing pin assembly is driven to move, the action of the seam lifting and the pressing pin is lifted to the set seam lifting and slight lifting height, the seam lifting and the slight lifting are completed, and then the next step S5 is carried out. In the process of starting sewing and slightly lifting, a base circle section 711 of a closed stitch contour surface 71 of a closed stitch cam 7 is in contact fit with a pin 91 on a needle pitch adjusting swing plate seat 9, the needle pitch adjusting swing plate seat 9 executes an idle stroke, a needle pitch adjusting assembly does not act, a trimming cam 3 is not in contact with a trimming driving crank 4, and the trimming driving crank 4, a trimming driving shaft 40 and the trimming assembly do not act. If the seam lift is not required, i.e., the controller receives the seam lift off signal, the next step S5 is directly proceeded to.
And step S5, the driving piece of the main shaft of the sewing machine starts to run to drive the main shaft of the sewing machine to rotate, and the sewing machine starts to sew. If the sewing start is slightly raised in step S4, the controller controls the rotating shaft 20 of the power member 2 to rotate counterclockwise in the reverse direction back to the original point a after the sewing of the sewing machine is completed, and the presser foot close stitch lifting drive shaft 5 and the presser foot lifting crank 6 are driven to rotate clockwise to be reset, so that the presser foot is lowered to the initial position.
And step S6, judging whether to cut the line. If the thread needs to be cut, whether the needle is tightly sewed is judged.
If the dense needle sewing is needed, namely the controller receives a dense needle sewing opening signal, the controller controls the rotating shaft 20 of the power part 2 to rotate anticlockwise from the original point A to enter the dense needle sewing interval a according to the set dense needle sewing pitch until the rotating shaft reaches a position corresponding to the set dense needle sewing pitch, the driving shaft 5 for lifting and pressing the dense needle sewing is driven to rotate clockwise through the transmission of the transmission assembly 50, the dense needle sewing cam 7 is driven to rotate clockwise, the needle pitch adjusting section 712 of the dense needle sewing profile surface 71 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch adjusting section 712 drives the needle pitch adjusting swing plate seat 9 to rotate, the needle pitch adjusting assembly is driven to move, and the needle pitch is adjusted to the set dense needle sewing pitch. Then, the controller controls the rotating shaft 20 of the power member 2 to be maintained at a position corresponding to the set stitch pitch until the number of sewing needles at the set stitch pitch reaches the set stitch pitch, thereby completing the stitch sewing operation. In the process of the action of the needle-sealing sewing, the thread cutting cam 3 is not contacted with the thread cutting driving crank 4, the thread cutting driving shaft 40 and the thread cutting assembly do not act, meanwhile, the presser foot lifting crank 6 is not contacted with the presser foot lifting ejector rod 8, and the presser foot lifting assembly does not act. After the dense needle sewing operation is completed, the controller controls the rotating shaft 20 of the power part 2 to continue to rotate anticlockwise, so that the rotating shaft 20 of the power part 2 quickly reaches the point B and enters the thread cutting interval B, when the rotating shaft rotates from the point B to the point C in the thread cutting interval B, the thread cutting section 311 of the thread cutting contour surface 31 of the thread cutting cam 3 is in contact fit with the thread cutting ball 41 on the thread cutting driving crank 4, the thread cutting section 311 drives the thread cutting driving crank 4 to drive the thread cutting driving shaft 40 to rotate, and the thread cutting assembly executes and completes thread cutting actions. During the thread trimming process, the needle pitch maintaining section 713 of the needle pitch contour surface 71 of the needle pitch cam 7 is in contact fit with the pin 91 on the needle pitch adjusting swing plate seat 9, so that the needle pitch is maintained at a fixed value without interfering the thread trimming action, and meanwhile, the presser foot lifting crank 6 is not in contact with the presser foot lifting ejector rod 8, and the presser foot lifting assembly does not act.
If the dense needle sewing is not needed, namely the controller receives a dense needle sewing closing signal, when the feeding tooth is arranged at the lower side of the needle plate, the controller controls the rotating shaft 20 of the power part 2 to rotate anticlockwise from the original point A, so that the rotating shaft 20 of the power part 2 rapidly passes through the dense needle sewing section a to reach a point B and enters a trimming section B, when the rotating shaft rotates from the point B to a point C in the trimming section B, a trimming section 311 of a trimming contour surface 31 of the trimming cam 3 is in contact fit with a trimming ball 41 on the trimming driving crank 4, the trimming driving crank 4 is driven by the trimming section 311 to drive the trimming driving shaft 40 to rotate, and the trimming assembly executes and finishes the trimming action. In the process, the presser foot lifting and closing stitch driving shaft 5 is driven to rotate clockwise through the transmission of the transmission assembly 50, the presser foot lifting and closing stitch cam 7 is driven to rotate rapidly from the base circle section 711 of the closing stitch contour surface 71 to the pin 91 on the needle pitch adjusting swing plate seat 9 in a contact matching mode until the needle pitch keeping section 713 is in contact matching with the pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch is kept at a fixed value and does not interfere with the thread cutting action, meanwhile, the presser foot lifting crank 6 is not in contact with the presser foot lifting ejector rod 8, and the presser foot lifting assembly does not act.
After the trimming operation is completed, the controller controls the rotating shaft 20 of the power part 2 to rotate clockwise in the opposite direction and return to the original point a quickly, so as to drive the trimming cam 3 to rotate clockwise for resetting, meanwhile, the trimming driving shaft 40 and the trimming driving crank 4 perform resetting in the opposite direction under the action of the resetting spring of the trimming mechanism, if a fault such as knife clamping occurs, the forced resetting section 312 of the trimming contour surface 31 of the trimming cam impacts the forced resetting part 42 of the trimming driving crank 4, so that the trimming driving crank 4 performs the opposite rotation, and the trimming driving shaft 40 and the trimming assembly are driven to perform resetting in the opposite direction. Meanwhile, when the rotating shaft 20 of the power part 2 rotates clockwise in the opposite direction, the pressure raising and pressing foot sealing stitch driving shaft 5, the pressure raising and pressing foot crank 6 and the sealing stitch cam 7 are driven to rotate counterclockwise to reset through the transmission of the transmission assembly 50, and the needle distance adjusting swing plate seat 9 and the needle distance adjusting assembly reset accordingly. And then proceeds to the next step S7.
If no trimming is required, the process proceeds directly to the next step S7.
And step S7, judging whether the presser foot is lifted. If the presser foot needs to be lifted, the controller controls the rotating shaft 20 of the power part 2 to rotate clockwise from the original point A into the presser foot lifting interval c according to the height of the arranged presser foot until the rotating shaft reaches the position corresponding to the height of the arranged presser foot, the presser foot lifting dense stitch driving shaft 5 is driven to rotate anticlockwise through the transmission of the transmission assembly 50, the presser foot lifting crank 6 is driven to rotate anticlockwise, the presser foot lifting crank 6 pushes the presser foot lifting ejector rod 8 upwards to move, the movement of the presser foot lifting ejector rod 8 drives the presser foot lifting assembly to move, the presser foot lifting action is executed, the height of the presser foot is lifted to the height of the arranged presser foot, and the presser foot lifting action is completed. After the presser foot is lifted, the rotating shaft 20 of the power part 2 is controlled by the controller to reversely rotate anticlockwise to return to the original point A, and the presser foot lifting and sealing stitch driving shaft 5 and the presser foot lifting crank 6 are driven to rotate clockwise to reset, so that the presser foot is lowered to the initial position. And then proceeds to the next step S8. In the process of lifting and lowering the presser foot and resetting, a base circle section 711 of a closed stitch contour surface 71 of the closed stitch cam 7 is in contact fit with a pin 91 on the needle pitch adjusting swing plate seat 9, the needle pitch adjusting swing plate seat 9 executes an idle stroke, the needle pitch adjusting assembly does not act, the thread trimming cam 3 is not in contact with the thread trimming driving crank 4, and the thread trimming driving crank 4, the thread trimming driving shaft 40 and the thread trimming assembly do not act. If the presser foot does not need to be lifted, the process proceeds to the next step S8.
And S8, finishing sewing, stopping the rotation of the main shaft of the sewing machine, judging whether to continue sewing, if so, returning to S2, and if not, entering the next step S9.
And step S9, finishing sewing and shutting down the sewing machine.
The method for trimming, lifting presser foot and sealing stitch of the sewing machine has the advantages of simple control time sequence, realization of three functions of trimming, lifting presser foot and sealing stitch by driving of the power part 2, realization of functions of a stitch lifting micro-lifting switch and a sealing stitch switch by a user according to requirements, setting of required presser foot lifting height, stitch lifting micro-lifting height, sealing stitch distance and sealing stitch number, convenience in operation, good stability and good applicability.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (4)
1. A method for sewing thread trimming, presser foot lifting and needle sealing of a sewing machine is characterized in that a thread trimming cam, a presser foot lifting crank and a needle sealing cam are driven to rotate by a power part, and in the sewing process:
when the dense needle sewing is needed, the rotating shaft of the power part rotates anticlockwise from an original point to enter a dense needle sewing interval and drives the dense needle sewing cam to rotate clockwise, the dense needle sewing cam drives the needle pitch adjusting mechanism to execute the needle pitch adjusting action, at the moment, the presser foot lifting mechanism and the thread cutting mechanism do not act, after the needle pitch is adjusted to the set dense needle sewing needle pitch, the rotating shaft of the power part is kept at a position corresponding to the set dense needle sewing needle pitch until the number of sewing needles under the set dense needle sewing needle pitch reaches the set dense needle sewing number, and the dense needle sewing operation is completed;
when thread cutting is needed, the rotating shaft of the power part rotates anticlockwise from a position corresponding to the set stitch pitch of the dense needle or from an original point to enter a thread cutting interval and drives the thread cutting cam to rotate anticlockwise, the thread cutting mechanism is driven to carry out thread cutting action through the thread cutting cam, the stitch pitch adjusting mechanism is driven by the dense needle sewing cam to keep a fixed stitch pitch value in the thread cutting process, and the presser foot lifting mechanism does not act; after the trimming is finished, the rotating shaft of the power part reversely and clockwise rotates to return to the original point;
when the presser foot is required to be lifted, the rotating shaft of the power part rotates clockwise from the original point to enter a presser foot lifting interval, the presser foot lifting crank is driven to rotate anticlockwise, the presser foot lifting mechanism is driven to perform the action of lifting the presser foot through the presser foot lifting crank, and at the moment, the thread cutting mechanism and the needle pitch adjusting mechanism do not act; and after the pressure foot lifting action is finished, the rotating shaft of the power part rotates anticlockwise in the opposite direction to return to the original point.
2. The method for trimming, lifting and pressing a dense stitch according to claim 1, wherein when the stitch lifting is required, before starting the sewing, the rotating shaft of the power member rotates clockwise from the original point into the stitch lifting interval within the stitch lifting interval, and drives the presser foot lifting crank to rotate counterclockwise, and the presser foot lifting mechanism is driven by the presser foot lifting crank to perform the presser foot lifting action; after sewing is started and the sewing is finished, the rotating shaft of the power piece reversely rotates anticlockwise to return to the original point.
3. The method for lifting and pressing the close stitch seam of the thread trimming cam of the sewing machine as claimed in claim 1, wherein after the thread trimming is completed, the rotating shaft of the power member reversely and clockwise rotates to return to the original point to drive the thread trimming cam to rotate and reset clockwise, and at the same time, the thread trimming mechanism is reset by the reset spring, or the thread trimming cam acts on the thread trimming driving crank to drive the thread trimming mechanism to reset.
4. The method for trimming, lifting and pressing a presser foot and sealing a stitch of a sewing machine as claimed in claim 1, wherein the start or stop of the rotation of the power member is controlled by a controller, and the rotation direction and the rotation angle of the rotation shaft of the power member are controlled.
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| CN201910097856.8A CN111501224B (en) | 2019-01-31 | 2019-01-31 | Method for thread trimming, presser foot lifting and needle stitch sealing of sewing machine |
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| CN114990794B (en) * | 2021-03-01 | 2023-06-20 | 杰克科技股份有限公司 | Sewing machine with same motor for controlling pressure of presser foot, lifting presser foot and cutting thread |
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